JP6917402B2 - Segment pieces, segment structures, corner segments, rings and structures - Google Patents

Description

The present invention relates to segment pieces, segment structures, corner segments, annular bodies and structures.

A shaft, a pier reinforcement structure, a tunnel, a caisson, etc., which are constructed in the ground or underwater by connecting a plurality of segments to form an annular body and connecting a plurality of the annular bodies in the axial direction thereof. The structure is known.
Among these structures, for example, a caisson is composed of a caisson skeleton in which a plurality of instep frames (segments) are connected in an annular shape. Filling materials such as concrete are cast in the internal spaces of the plurality of connected instep frames, and the instep frame and the filling material are integrally formed. The instep frame has a frame provided with a plurality of reinforcing members and a side wall plate that covers the outer side surface or the inner side surface of the frame (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2004-11327

In recent years, there has been an increasing demand for large-section construction of structures constructed underground or underwater. When it comes to construction with a large cross section, the segments that make up the structure also need to be large in order to ensure the required cross-sectional performance. However, since there is a limit to the size that can be loaded on transportation equipment such as trucks and trailers, it is difficult to transport the segments to the construction site after creating the segments by simply enlarging the segments of the conventional structure. .. In addition, it is not preferable to construct the structure from scratch at the construction site because the construction efficiency is lowered.

On the other hand, in a structure constructed in the ground or underwater, the earth pressure and water pressure acting on the structure increase as the depth increases, and a circular cross section becomes mechanically advantageous in order to efficiently resist these. However, in the case of a large cross section with an outer diameter of more than 15 m or when the internal space of the structure is to be effectively used, the cross section including the curve generated by the circular cross section creates a wasteful space inside and outside the structure which is difficult to effectively use. become. Especially in urban areas where effective use of limited land area is required, it is desired to eliminate this wasted space. Therefore, in order to eliminate wasted space as much as possible, it is conceivable to make the cross section of the structure rectangular.

However, when a corner portion is provided in the structure, a large bending moment acts on the corner portion in the cross-sectional direction. Therefore, the conventional segment structure cannot withstand the bending moment acting on the corner portion, which causes a structural problem.

Therefore, the present invention has been made in view of the above problems, and can be applied to a large cross section, can be transported by a transportation device, and can withstand a bending moment acting on a corner portion. It is an object of the present invention to provide a segment piece, a segment structure, a corner segment, an annular body and a structure which can be formed.

In order to solve the above problems, the present invention is a segment piece that forms a corner portion of an annular body having a polygonal cross section that constitutes a structure, and is a first skeleton portion that forms a wall surface of the structure. A second skeleton portion provided on the first skeleton portion so as to form a wall surface of the structure and the surface direction of the wall surface intersects the surface direction of the wall surface of the first skeleton portion, and the above. It is characterized by including a third skeleton portion provided on the first skeleton portion apart from the second skeleton portion.

Further, it is preferable that the extending directions of the second skeleton portion and the third skeleton portion are parallel to each other.

The present invention is a segment structure formed by connecting a plurality of the above segment pieces, and the second skeleton portions of each segment piece have their wall surfaces along the outer wall surface of the annular body. It is characterized in that the third skeleton portions in each segment piece are connected in a state of being connected in a state where the wall surface thereof is along the inner wall surface of the annular body.

Further, a reinforcing portion for connecting the first skeleton portion and the second skeleton portion or the third skeleton portion is provided in one segment piece or between a plurality of connected segment pieces. It is preferable that the reinforcing portion is provided along a direction in which the extending direction intersects the extending directions of all the skeleton portions.

Further, it is preferable that a plurality of the reinforcing portions are provided and the extending directions of the reinforcing portions are parallel to each other.

The present invention is a corner segment that forms a corner of an annular body having a polygonal cross section that constitutes a structure, and is a space sandwiched between the segment structure and the segment piece in the segment structure. It is characterized in that it is provided with a filling material provided in.

The present invention is characterized in that it is an annular body having a polygonal cross section constituting a structure, and includes the above-mentioned corner segment and a straight segment that linearly connects the corner segments. do.

Further, the straight portion segment includes an outer piece forming the outer wall surface of the structure, an inner piece forming the inner wall surface of the structure, a connecting portion connecting the outer piece and the inner piece, and the outer piece. It is preferable to provide a filling material provided in the space sandwiched between the inner pieces.

The present invention is a structure in which the annular bodies are connected in the axial direction, and the annular bodies are connected so that the seams of the corner segment or the straight segment do not overlap between adjacent annular bodies. It is characterized by being done.

According to the present invention, it is possible to carry out construction with a large cross section, it is possible to carry it by a transportation device, and it is possible to withstand a bending moment acting on a corner portion.

It is a vertical sectional view of an underground structure. It is a GG arrow view in FIG. FIG. 1 is a view taken along the line HU in FIG. It is a top view which shows the structure of the corner part of an annular body. It is a top view which shows the structure which removed the filling material in FIG. It is a top view which shows the structure of the segment piece in the corner segment structure. It is a top view which shows the structure of the reinforcing part. FIG. 5 is a view taken along the line BB in FIG. FIG. 5 is a view taken along the line CC in FIG. FIG. 5 is a view taken along the line DD in FIG. FIG. 6 is a view taken along the line AA in FIG. It is a top view which shows the straight part segment structure. It is a top view which shows the structure of the segment piece in the straight part segment structure. FIG. 13 is a view taken along the line EE in FIG. It is a figure explaining the cross-sectional force of a corner part when a bending moment acts in the direction which the inside of a corner part closes. It is a figure explaining the cross-sectional force of a corner part when a bending moment acts in the direction which the inside of a corner part opens. It is a top view which shows the structure of the corner part of an annular body in another example. It is a top view which shows the structure of the segment piece of the corner segment in the modification 1 and is partially simplified. It is a top view which shows the structure of the segment piece of the corner segment in the modification 2 and is partially simplified. It is a top view which shows the structure of the segment piece of the corner segment in the modification 3 and is partially simplified. FIG. 5 is a plan view showing the structure of the segment piece of the corner segment in the modified example 4 and simplifying a part thereof. FIG. 5 is a plan view showing the structure of the segment piece of the corner segment in the modified example 5 and simplifying a part thereof. FIG. 6 is a plan view showing the structure of the segment piece of the corner segment in the modified example 6 and simplifying a part thereof. FIG. 5 is a plan view showing the structure of the segment piece of the corner segment in the modified example 7 and simplifying a part thereof. FIG. 5 is a plan view showing the structure of the segment piece of the corner segment in the modified example 8 and simplifying a part thereof. FIG. 6 is a plan view showing the structure of the segment piece of the corner segment for comparing the structure with the segment piece shown in FIG. 6, and partially simplified.

A preferred embodiment of the present invention will be described with reference to the drawings. It should be noted that the embodiment shown below is an example, and various forms can be taken as long as the purpose is not deviated.

<Structure, ring>
The structure is mainly constructed underground or underwater at the time of construction of a shaft, a structure for reinforcing piers, a tunnel, a caisson, or the like. FIG. 1 shows an example of an underground structure 100 in which a part or all of it is buried in the ground. When the underground structure 100 is used for a shaft, the underground structure 100 is provided at an excavation start point, an intermediate point, or the like of a tunnel constructed in the ground by a shield method or the like, and is inside the underground structure 100. The space serves as a transport path and ventilation port for the shield machine.
As shown in FIGS. 1 to 3, the underground structure 100 is constructed in a tubular shape, and is buried in the ground so that its axis line is along the vertical direction, for example. The underground structure 100 is formed in a polygonal shape in a plan view (cross-sectional view). In the present embodiment, the underground structure 100 is formed in a rectangular shape in a plan view.

As shown in FIGS. 1 to 3, in the underground structure 100, a plurality of annular bodies 1 and a plurality of annular bodies 2 are alternately stacked in the axial direction of the underground structure 100, and the adjacent annular bodies 1, It is configured by connecting two to each other.
As shown in FIGS. 2 and 3, the annular body 1 and the annular body 2 are formed in an annular shape by connecting a plurality of corner portion segments 3 and a plurality of straight line portion segments 4, respectively. Specifically, each of the annular bodies 1 and 2 is formed in a square shape in a plan view having a side of 25 m, and each of the annular bodies 1 and 2 has four corner segment 3 and 14 straight lines. It includes a section segment 4. In the annular body 1 shown in FIG. 2, each corner segment 3 is arranged along the lateral direction in the drawing, and in the annular body 2 shown in FIG. 3, each corner segment 3 is arranged. Are arranged so that their length direction is along the vertical direction in the drawing.
As shown in FIG. 1, the annular bodies 1 and 2 overlap in the axial direction between the annular bodies 1 and 2 in which the joints of the corner segment 3 and the straight line segment 4 constituting the annular bodies 1 and 2 are adjacent to each other. They are stacked and connected so that they do not become. That is, the corner segment 3 and the straight segment 4 constituting the annular bodies 1 and 2 are arranged in a staggered manner when viewed from the side surface of the underground structure 100.

When the underground structure 100 is used as a submerged structure such as a caisson, a bottom plate portion is formed on the inner bottom portion of the underground structure 100 by placing concrete. Further, in order to efficiently bury the underground structure 100 in the ground, a blade edge ring is provided in the lowermost layer of the underground structure 100, and between the annular bodies 1 and 2 and the blade edge ring. Both are connected via a workbench ring and a guide ring.
When submerging the underground structure 100 in the ground, the above-mentioned cutting edge ring is provided on the ground surface of the construction site, the ground inside the cutting edge ring is excavated, and then the upper end of the cutting edge ring is sunk. The blade edge ring is sunk in the ground by pressing it toward the ground. After the blade edge ring is sunk to a certain depth, the above-mentioned annular bodies 1 and 2 are connected to the upper end of the blade edge ring, the inside of the annular bodies 1 and 2 is excavated, and the upper ends of the annular bodies 1 and 2 are sunk. The device presses against the ground, and the annular bodies 1 and 2 are sunk in the ground. In this way, the underground structure 100 is sunk by repeating the assembly of the underground structure 100 by connecting the plurality of annular bodies 1 and 2 and the excavation of the ground and the pressing of the annular bodies 1 and 2 in order. Can be submerged in the ground.

<Corner segment>
As shown in FIGS. 4 to 6, the corner segment 3 includes a corner segment structure 5 and a filling material 51. That is, the corner segment 3 is a synthetic segment in which the corner segment structure 5 and the filling material 51 are integrally formed.
The corner segment structure 5 includes two segment pieces 71 and 72 and a reinforcing portion 73. The segment piece 71 is arranged closer to the outside of the annular bodies 1 and 2, and a part thereof forms an outer wall. The segment piece 72 is arranged closer to the inside of the annular bodies 1 and 2, and a part thereof forms an inner wall and an outer wall. Hereinafter, the segment piece 71 will be referred to as an outer piece 71, and the segment piece 72 will be referred to as an inner piece 72.

(Outer piece)
As shown in FIGS. 4 to 6, the outer piece 71 includes a first skeleton portion 10, a second skeleton portion 20, a third skeleton portion 30, and a connecting portion 40.
The first skeleton portion 10 forms the outer wall surface of the underground structure 100. The first skeleton portion 10 includes a plate 11, a main girder 12, a joint plate 13, and a stiffener 14.

The plate 11 forms the outer wall surface of the annular bodies 1 and 2, and is formed in a rectangular shape. The plate 11 is formed of, for example, a steel plate, and the plate thickness thereof is preferably, for example, 3 mm to 38 mm, and particularly preferably 9 mm. The height of the plate 11 is preferably, for example, 0.5 m to 2.5 m, and particularly preferably 1.0 m.

The main girder 12 is erected on the upper end edge and the lower end edge of the plate 11 in the height direction (direction in which the annular bodies 1 and 2 are stacked and connected). That is, two main girders 12 are provided on the plate 11. The main girder 12 is erected at a right angle to the inner surface of the plate 11. The main girder 12 is formed of, for example, a steel plate, and the plate thickness thereof is preferably, for example, 6 mm to 38 mm, particularly preferably 17.4 mm. Further, the width of the main girder 12 is preferably, for example, 0.1 m to 0.5 m, and particularly preferably 0.3 m. The main girder 12 is provided with a plurality of joints 12a at predetermined intervals along the longitudinal direction (extending direction) thereof.
The joint 12a is for connecting the upper and lower annular bodies 1 and 2 to each other so as not to be relatively displaced. Specifically, the joint 12a includes a male joint and a female joint into which the male joint is inserted and locked. The male joint is provided on the main girder 12 on the upper end side of the plate 11, and is formed in a wedge shape, for example. The female joint is provided on the main girder 12 on the lower end side of the plate 11, and both joints are located concentrically with each other. The male joint is inserted into the female joint in a state where the wedge-shaped portion is elastically deformed, and is held in the female joint by the restoring force of the male joint. A known joint 12a can be used, and the joint 12a is not limited to the above configuration.

The joint plate 13 is erected at both ends of the main girder 12 in the longitudinal direction (extending direction) so as to connect both ends of the two main girders 12. The joint plate 13 is erected at a right angle to the inner surface of the plate 11. The joint plate 13 is formed of, for example, a steel plate, and the plate thickness thereof is preferably, for example, 4 mm to 38 mm, and particularly preferably 9.5 mm. The width of the joint plate 13 is preferably, for example, 0.1 m to 0.5 m, and particularly preferably 0.3 m. Further, the height of the joint plate 13 is preferably 0.5 m to 2.5 m, and particularly preferably 1.0 m.

The stiffener 14 has two functions, that is, a function of increasing the rigidity of the corner segment 3 and a function of attaching the reinforcing portion 73. The stiffeners 14 are erected at right angles to the inner surface of the plate 11 in parallel with the joint plate 13 at predetermined intervals along the longitudinal direction of the main girder 12. Each of the stiffeners 14 is joined to the inner surface of the plate 11 by welding or the like. The shape of the stiffener 14 is not limited as long as it enhances the rigidity of the corner segment 3 and enables connection with the reinforcing portion 73, respectively.
The stiffener 14 is formed of, for example, a steel plate. The plate thickness of the stiffener 14 is preferably, for example, 3 mm to 38 mm, and particularly preferably 16 mm. The width of the stiffener 14 is preferably, for example, 0.1 m to 0.5 m, and particularly preferably 0.3 m. Further, the height of the stiffener 14 is preferably, for example, 0.5 m to 2.5 m, and particularly preferably 1.0 m.
The main girder 12 and the stiffener 14 may both be joined to the plate 11 by welding, or may be partially formed integrally with the plate 11. Further, the joint plate 13 may be joined to the main girder 12 by welding, or a part thereof may be integrally formed with the main girder 12.

The second skeleton portion 20 forms the outer wall surface of the underground structure 100. The second skeleton portion 20 is connected to the first skeleton portion 10 so that the surface direction of the outer wall surface intersects the surface direction of the outer wall surface of the first skeleton portion 10. The second skeleton portion 20 includes a plate 21, a main girder 22, a joint plate 23, and a stiffener 24.

The plate 21 forms the outer wall surface of the annular bodies 1 and 2, and is formed in a rectangular shape. The plate 21 is abutted from the side with the joint plate 13 on the corner portion side of the annular bodies 1 and 2 in the first skeleton portion 10, and is joined by welding or the like. That is, the plate 21 is provided so as to be flush with the joint plate 13. Of course, the plate 21 and the joint plate 13 do not necessarily have to be flush with each other, and may be provided so as to overlap the joint plate 13. The plate 21 is formed of, for example, a steel plate, and the plate thickness thereof is preferably, for example, 3 mm to 38 mm, and particularly preferably 9 mm. The height of the plate 11 is preferably, for example, 0.5 m to 2.5 m, and particularly preferably 1.0 m.

The main girder 22 is erected on the upper end edge and the lower end edge of the plate 21 in the height direction (direction in which the annular bodies 1 and 2 are stacked and connected). That is, two main girders 22 are provided on the plate 21. One end of the main girder 22 in the longitudinal direction (extending direction) is abutted from the side with the main girder 12 of the first skeleton portion 10 and is joined by welding or the like. That is, the main girder 22 is provided so as to be flush with the main girder 12. A widening portion 22b, which is wider than the other portions, is formed at one end of the main girder 22, and the joint strength with the main girder 12 is enhanced. The main girder 22 is erected at a right angle to the inner surface of the plate 21. The main girder 22 is formed of, for example, a steel plate, and the plate thickness thereof is preferably, for example, 6 mm to 38 mm, particularly preferably 17.4 mm. The width of the main girder 22 is, for example, preferably 0.1 m to 0.5 m, and particularly preferably 0.3 m. The main girder 22 is provided with joints 12a at predetermined intervals along the longitudinal direction (extending direction) of the main girder 22.
The joint 12a is for connecting the upper and lower annular bodies 1 and 2 to each other so as not to be relatively displaced. Specifically, the joint 12a includes a male joint and a female joint into which the male joint is inserted and locked. The male joint is provided on the main girder 22 on the upper end side of the plate 21, and is formed in a wedge shape, for example. The female joint is provided on the main girder 22 on the lower end side of the plate 21, and both joints are located concentrically with each other. The male joint is inserted into the female joint in a state where the wedge-shaped portion is elastically deformed, and is held in the female joint by the restoring force of the male joint. A known joint 12a can be used, and the joint 12a is not limited to the above configuration.

The joint plate 23 is erected at the other end (the end on the side not joined to the main girder 12) in the longitudinal direction (extending direction) of the main girder 22 so as to connect the ends of the two main girders 22. Has been done. The joint plate 23 is erected at a right angle to the inner surface of the plate 21. The joint plate 23 is formed of, for example, a steel plate, and the plate thickness thereof is preferably, for example, 4 mm to 38 mm, and particularly preferably 9.5 mm. The width of the joint plate 23 is preferably, for example, 0.1 m to 0.5 m, and particularly preferably 0.3 m. Further, the height of the joint plate 23 is preferably 0.5 m to 2.5 m, and particularly preferably 1.0 m.

The stiffener 24 has two functions, that is, a function of increasing the rigidity of the corner segment 3 and a function of attaching the reinforcing portion 73. The stiffeners 24 are erected at right angles to the inner surface of the plate 21 in parallel with the joint plate 23 at predetermined intervals along the longitudinal direction of the main girder 22. The stiffener 24 is joined to the inner surface of the plate 21 by welding or the like. The shape of the stiffener 24 is not limited as long as it enhances the rigidity of the corner segment 3 and enables connection with the reinforcing portion 73, respectively.
The stiffener 24 is formed of, for example, a steel plate. The plate thickness of the stiffener 24 is preferably, for example, 3 mm to 38 mm, and particularly preferably 16 mm. The width of the stiffener 24 is preferably, for example, 0.1 m to 0.5 m, and particularly preferably 0.3 m. Further, the height of the stiffener 24 is preferably, for example, 0.5 m to 2.5 m, and particularly preferably 1.0 m.
The main girder 22 and the stiffener 24 may both be joined to the plate 21 by welding, or may be partially formed integrally with the plate 21. Further, the joint plate 23 may be joined to the main girder 22 by welding, or a part thereof may be integrally formed with the main girder 22.

The third skeleton portion 30 is separated from the second skeleton portion 20 and connected to the first skeleton portion 10. The third skeleton portion 30 is connected to the first skeleton portion 10 so that the surface direction of the wall surface intersects the surface direction of the outer wall surface of the first skeleton portion 10. The third skeleton portion 30 is connected to the first skeleton portion 10 so that its extending direction is parallel to the extending direction of the second skeleton portion 20. As a result, the outer piece 71 is formed in a substantially F-shape in a plan view when viewed from below.
The third skeleton portion 30 includes a plate 31, a main girder 32, a joint plate 33, and a stiffener 34.

The plate 31 is formed in a rectangular shape. The plate 31 is abutted from the side with the stiffener 14 of the first skeleton portion 10 and is joined by welding or the like. That is, the plate 31 is provided so as to be flush with the stiffener 14. Of course, the plate 31 and the stiffener 14 do not necessarily have to be flush with each other. The plate 31 is provided so that its surface direction is parallel to the surface direction of the plate 21. The plate 31 is formed of, for example, a steel plate, and the plate thickness thereof is preferably, for example, 3 mm to 38 mm, and particularly preferably 9 mm. The height of the plate 11 is preferably, for example, 0.5 m to 2.5 m, and particularly preferably 1.0 m.

The main girder 32 is erected on the upper end edge and the lower end edge of the plate 31 in the height direction (direction in which the annular bodies 1 and 2 are stacked and connected). That is, two main girders 32 are provided on the plate 31. One end of the main girder 32 in the longitudinal direction (extending direction) is abutted from the side with the main girder 12 of the first skeleton portion 10 and is joined by welding or the like. That is, the main girder 32 is provided so as to be flush with the main girder 12. The main girder 32 is erected at a right angle to the inner surface of the plate 31. The main girder 32 is formed of, for example, a steel plate, and the plate thickness thereof is preferably, for example, 6 mm to 38 mm, particularly preferably 17.4 mm. The width of the main girder 32 is, for example, 0.1 m to 0.5 m, and particularly 0.3 m. The main girder 32 is provided with joints 12a at predetermined intervals along the longitudinal direction (extending direction) of the main girder 32.
The joint 12a is for connecting the upper and lower annular bodies 1 and 2 to each other so as not to be relatively displaced. Specifically, the joint 12a includes a male joint and a female joint into which the male joint is inserted and locked. The male joint is provided on the main girder 32 on the upper end side of the plate 31, and is formed in a wedge shape, for example. The female joint is provided on the main girder 32 on the lower end side of the plate 31, and both joints are located concentrically with each other. The male joint is inserted into the female joint in a state where the wedge-shaped portion is elastically deformed, and is held in the female joint by the restoring force of the male joint. A known joint 12a can be used, and the joint 12a is not limited to the above configuration.

The joint plate 33 is erected at the other end (the end on the side not joined to the main girder 12) in the longitudinal direction (extending direction) of the main girder 32 so as to connect the ends of the two main girders 32. Has been done. The joint plate 33 is erected at a right angle to the inner surface of the plate 31. The joint plate 33 is formed of, for example, a steel plate, and the plate thickness thereof is preferably, for example, 4 mm to 38 mm, and particularly preferably 9.5 mm. The width of the joint plate 33 is preferably, for example, 0.1 m to 0.5 m, and particularly preferably 0.3 m. Further, the height of the joint plate 33 is preferably 0.5 m to 2.5 m, and particularly preferably 1.0 m.

The stiffener 34 has two functions, that is, a function of increasing the rigidity of the corner segment 3 and a function of attaching the reinforcing portion 73. The stiffeners 34 are erected at right angles to the inner surface of the plate 31 in parallel with the joint plate 33 at predetermined intervals along the longitudinal direction of the main girder 32. The stiffener 34 is joined to the inner surface of the plate 31 by welding or the like. The shape of the stiffener 34 is not limited as long as it enhances the rigidity of the corner segment 3 and enables connection with the reinforcing portion 73, respectively.
The stiffener 34 is formed of, for example, a steel plate. The plate thickness of the stiffener 34 is preferably, for example, 3 mm to 38 mm, and particularly preferably 16 mm. The width of the stiffener 34 is preferably, for example, 0.1 m to 0.5 m, and particularly preferably 0.3 m. Further, the height of the stiffener 34 is preferably, for example, 0.5 m to 2.5 m, and particularly preferably 1.0 m.
The main girder 32 and the stiffener 34 may both be joined to the plate 31 by welding, or may be partially formed integrally with the plate 31. Further, the joint plate 33 may be joined to the main girder 32 by welding, or a part thereof may be integrally formed with the main girder 32.

For example, the tip of the connecting portion 40 is formed in a substantially C shape in a plan view, and the connecting portions 40 having the same shape are engaged with each other to realize the connection. The connecting portion 40 is formed of, for example, a linearly formed steel sheet pile.
The connecting portion 40 is provided at one end of the plate 11 of the first skeleton portion 10 on the side not at the corner in the longitudinal direction, and is connected to the adjacent straight portion segment 4.
The connecting portion 40 is provided on the other end side (the side not connected to the main girder 22) of the plate 21 of the second skeleton portion 20 in the longitudinal direction, and is connected to the inner piece 72.
The connecting portion 40 is provided on the other end side (the side not connected to the main girder 32) of the plate 31 of the third skeleton portion 30 in the longitudinal direction, and is connected to the inner piece 72.

(Inner piece)
As shown in FIGS. 4 to 6, the inner piece 72 includes a first skeleton portion 10, a second skeleton portion 20, a third skeleton portion 30, and a connecting portion 40.
The first skeleton portion 10 forms an inner wall surface of the underground structure 100. The first skeleton portion 10 includes a plate 11, a main girder 12, a joint plate 13, and a stiffener 14.

The plate 11 forms the inner wall surface of the annular bodies 1 and 2, and is formed in a rectangular shape. The plate 11 is formed of, for example, a steel plate, and the plate thickness thereof is preferably, for example, 3 mm to 38 mm, and particularly preferably 9 mm. The height of the plate 11 is preferably, for example, 0.5 m to 2.5 m, and particularly preferably 1.0 m.

The main girder 12 is erected on the upper end edge and the lower end edge of the plate 11 in the height direction (direction in which the annular bodies 1 and 2 are stacked and connected). That is, two main girders 12 are provided on the plate 11. The main girder 12 is erected at a right angle to the inner surface of the plate 11. The main girder 12 is formed of, for example, a steel plate, and the plate thickness thereof is preferably, for example, 6 mm to 38 mm, particularly preferably 17.4 mm. Further, the width of the main girder 12 is preferably, for example, 0.1 m to 0.5 m, and particularly preferably 0.3 m. The main girder 12 is provided with a plurality of joints 12a at predetermined intervals along the longitudinal direction (extending direction) thereof.
The joint 12a is for connecting the upper and lower annular bodies 1 and 2 to each other so as not to be relatively displaced. Specifically, the joint 12a includes a male joint and a female joint into which the male joint is inserted and locked. The male joint is provided on the main girder 12 on the upper end side of the plate 11, and is formed in a wedge shape, for example. The female joint is provided on the main girder 12 on the lower end side of the plate 11, and both joints are located concentrically with each other. The male joint is inserted into the female joint in a state where the wedge-shaped portion is elastically deformed, and is held in the female joint by the restoring force of the male joint. A known joint 12a can be used, and the joint 12a is not limited to the above configuration.

The joint plate 13 is erected at both ends of the main girder 12 in the longitudinal direction (extending direction) so as to connect both ends of the two main girders 12. The joint plate 13 is erected at a right angle to the inner surface of the plate 11. The joint plate 13 is formed of, for example, a steel plate, and the plate thickness thereof is preferably, for example, 4 mm to 38 mm, and particularly preferably 9.5 mm. The width of the joint plate 13 is preferably, for example, 0.1 m to 0.5 m, and particularly preferably 0.3 m. Further, the height of the joint plate 13 is preferably 0.5 m to 2.5 m, and particularly preferably 1.0 m.

The stiffener 14 has two functions, that is, a function of increasing the rigidity of the corner segment 3 and a function of attaching the reinforcing portion 73. The stiffeners 14 are erected at right angles to the inner surface of the plate 11 in parallel with the joint plate 13 at predetermined intervals along the longitudinal direction of the main girder 12. Each of the stiffeners 14 is joined to the inner surface of the plate 11 by welding or the like. The shape of the stiffener 14 is not limited as long as it enhances the rigidity of the corner segment 3 and enables connection with the reinforcing portion 73, respectively.
The stiffener 14 is formed of, for example, a steel plate. The plate thickness of the stiffener 14 is preferably, for example, 3 mm to 38 mm, and particularly preferably 16 mm. The width of the stiffener 14 is preferably, for example, 0.1 m to 0.5 m, and particularly preferably 0.3 m. Further, the height of the stiffener 14 is preferably, for example, 0.5 m to 2.5 m, and particularly preferably 1.0 m.
The main girder 12 and the stiffener 14 may both be joined to the plate 11 by welding, or may be partially formed integrally with the plate 11. Further, the joint plate 13 may be joined to the main girder 12 by welding, or a part thereof may be integrally formed with the main girder 12.

The second skeleton portion 20 forms the outer wall surface of the underground structure 100. The second skeleton portion 20 is connected to the first skeleton portion 10 so that the surface direction of the outer wall surface intersects the surface direction of the inner wall surface of the first skeleton portion 10. The second skeleton portion 20 includes a plate 21, a main girder 22, a joint plate 23, and a stiffener 24.

The plate 21 forms the outer wall surface of the annular bodies 1 and 2, and is formed in a rectangular shape. The plate 21 is provided so as to overlap the joint plate 13 on the corner portion side of the annular bodies 1 and 2 in the first skeleton portion 10, and is joined by welding or the like. The plate 21 may be provided so as to be flush with the joint plate 13. The plate 21 is formed of, for example, a steel plate, and the plate thickness thereof is preferably, for example, 3 mm to 38 mm, and particularly preferably 9 mm. The height of the plate 11 is preferably, for example, 0.5 m to 2.5 m, and particularly preferably 1.0 m.

The main girder 22 is erected on the upper end edge and the lower end edge of the plate 21 in the height direction (direction in which the annular bodies 1 and 2 are stacked and connected). That is, two main girders 22 are provided on the plate 21. One end of the main girder 22 in the longitudinal direction (extending direction) is abutted from the side with the main girder 12 of the first skeleton portion 10 and is joined by welding or the like. That is, the main girder 22 is provided so as to be flush with the main girder 12. The main girder 22 is erected at a right angle to the inner surface of the plate 21. The main girder 22 is formed of, for example, a steel plate, and the plate thickness thereof is preferably, for example, 6 mm to 38 mm, particularly preferably 17.4 mm. The width of the main girder 22 is, for example, preferably 0.1 m to 0.5 m, and particularly preferably 0.3 m. The main girder 22 is provided with joints 12a at predetermined intervals along the longitudinal direction (extending direction) of the main girder 22.
The joint 12a is for connecting the upper and lower annular bodies 1 and 2 to each other so as not to be relatively displaced. Specifically, the joint 12a includes a male joint and a female joint into which the male joint is inserted and locked. The male joint is provided on the main girder 22 on the upper end side of the plate 21, and is formed in a wedge shape, for example. The female joint is provided on the main girder 22 on the lower end side of the plate 21, and both joints are located concentrically with each other. The male joint is inserted into the female joint in a state where the wedge-shaped portion is elastically deformed, and is held in the female joint by the restoring force of the male joint. A known joint 12a can be used, and the joint 12a is not limited to the above configuration.

The joint plate 23 is erected at the other end (the end on the side not joined to the main girder 12) in the longitudinal direction (extending direction) of the main girder 22 so as to connect the ends of the two main girders 22. Has been done. The joint plate 23 is erected at a right angle to the inner surface of the plate 21. The joint plate 23 is formed of, for example, a steel plate, and the plate thickness thereof is preferably, for example, 4 mm to 38 mm, and particularly preferably 9.5 mm. The width of the joint plate 23 is preferably, for example, 0.1 m to 0.5 m, and particularly preferably 0.3 m. Further, the height of the joint plate 23 is preferably 0.5 m to 2.5 m, and particularly preferably 1.0 m.

The stiffener 24 has two functions, that is, a function of increasing the rigidity of the corner segment 3 and a function of attaching the reinforcing portion 73. The stiffeners 24 are erected at right angles to the inner surface of the plate 21 in parallel with the joint plate 23 at predetermined intervals along the longitudinal direction of the main girder 22. The stiffener 24 is joined to the inner surface of the plate 21 by welding or the like. The shape of the stiffener 24 is not limited as long as it enhances the rigidity of the corner segment 3 and enables connection with the reinforcing portion 73, respectively.
The stiffener 24 is formed of, for example, a steel plate. The plate thickness of the stiffener 24 is preferably, for example, 3 mm to 38 mm, and particularly preferably 16 mm. The width of the stiffener 24 is preferably, for example, 0.1 m to 0.5 m, and particularly preferably 0.3 m. Further, the height of the stiffener 24 is preferably, for example, 0.5 m to 2.5 m, and particularly preferably 1.0 m.
The main girder 22 and the stiffener 24 may both be joined to the plate 21 by welding, or may be partially formed integrally with the plate 21. Further, the joint plate 23 may be joined to the main girder 22 by welding, or a part thereof may be integrally formed with the main girder 22.

The third skeleton portion 30 is separated from the second skeleton portion 20 and connected to the first skeleton portion 10. The third skeleton portion 30 is connected to the first skeleton portion 10 so that the surface direction of the wall surface intersects the surface direction of the inner wall surface of the first skeleton portion 10. The third skeleton portion 30 is connected to the first skeleton portion 10 so that its extending direction is parallel to the extending direction of the second skeleton portion 20. As a result, the inner piece 72 is formed in a substantially F-shape in a plan view when viewed from above. That is, in the outer piece 71 and the inner piece 72, the connecting positions of the second skeleton portion 20 and the third skeleton portion 30 with respect to the first skeleton portion 10 are reversed.
The third skeleton portion 30 includes a plate 31, a main girder 32, a joint plate 33, and a stiffener 34.

The plate 31 is formed in a rectangular shape. The plate 31 is penetrated from the inner surface to the outer surface of the plate 11 of the first skeleton portion 10, and is joined by welding or the like. That is, the plate 31 also functions as one of the stiffeners 14. The plate 31 is provided so that its surface direction is parallel to the surface direction of the plate 21. The plate 31 is formed of, for example, a steel plate, and the plate thickness thereof is preferably, for example, 3 mm to 38 mm, and particularly preferably 9 mm. The height of the plate 11 is preferably, for example, 0.5 m to 2.5 m, and particularly preferably 1.0 m.

The main girder 32 is erected on the upper end edge and the lower end edge of the plate 31 in the height direction (direction in which the annular bodies 1 and 2 are stacked and connected). That is, two main girders 32 are provided on the plate 31. One end of the main girder 32 in the longitudinal direction (extending direction) is abutted from the side with the main girder 12 of the first skeleton portion 10 and is joined by welding or the like. That is, the main girder 32 is provided so as to be flush with the main girder 12. A widening portion 32b, which is wider than the other portions, is formed at one end of the main girder 32 to increase the joint strength with the main girder 12. The main girder 32 is erected at a right angle to the inner surface of the plate 31. The main girder 32 is formed of, for example, a steel plate, and the plate thickness thereof is preferably, for example, 6 mm to 38 mm, particularly preferably 17.4 mm. The width of the main girder 32 is, for example, 0.1 m to 0.5 m, and particularly 0.3 m. The main girder 32 is provided with joints 12a at predetermined intervals along the longitudinal direction (extending direction) of the main girder 32.
The joint 12a is for connecting the upper and lower annular bodies 1 and 2 to each other so as not to be relatively displaced. Specifically, the joint 12a includes a male joint and a female joint into which the male joint is inserted and locked. The male joint is provided on the main girder 32 on the upper end side of the plate 31, and is formed in a wedge shape, for example. The female joint is provided on the main girder 32 on the lower end side of the plate 31, and both joints are located concentrically with each other. The male joint is inserted into the female joint in a state where the wedge-shaped portion is elastically deformed, and is held in the female joint by the restoring force of the male joint. A known joint 12a can be used, and the joint 12a is not limited to the above configuration.

The joint plate 33 is erected at the other end (the end on the side not joined to the main girder 12) in the longitudinal direction (extending direction) of the main girder 32 so as to connect the ends of the two main girders 32. Has been done. The joint plate 33 is erected at a right angle to the inner surface of the plate 31. The joint plate 33 is formed of, for example, a steel plate, and the plate thickness thereof is preferably, for example, 4 mm to 38 mm, and particularly preferably 9.5 mm. The width of the joint plate 33 is preferably, for example, 0.1 m to 0.5 m, and particularly preferably 0.3 m. Further, the height of the joint plate 33 is preferably 0.5 m to 2.5 m, and particularly preferably 1.0 m.

The stiffener 34 has two functions, that is, a function of increasing the rigidity of the corner segment 3 and a function of attaching the reinforcing portion 73. The stiffeners 34 are erected at right angles to the inner surface of the plate 31 in parallel with the joint plate 33 at predetermined intervals along the longitudinal direction of the main girder 32. The stiffener 34 is joined to the inner surface of the plate 31 by welding or the like. The shape of the stiffener 34 is not limited as long as it enhances the rigidity of the corner segment 3 and enables connection with the reinforcing portion 73, respectively.
The stiffener 34 is formed of, for example, a steel plate. The plate thickness of the stiffener 34 is preferably, for example, 3 mm to 38 mm, and particularly preferably 16 mm. The width of the stiffener 34 is preferably, for example, 0.1 m to 0.5 m, and particularly preferably 0.3 m. Further, the height of the stiffener 34 is preferably, for example, 0.5 m to 2.5 m, and particularly preferably 1.0 m.
The main girder 32 and the stiffener 34 may both be joined to the plate 31 by welding, or may be partially formed integrally with the plate 31. Further, the joint plate 33 may be joined to the main girder 32 by welding, or a part thereof may be integrally formed with the main girder 32.

For example, the tip of the connecting portion 40 is formed in a C shape in a plan view, and the connecting portion 40 is connected by engaging the connecting portions 40 having the same shape. The connecting portion 40 is formed of, for example, a linearly formed steel sheet pile.
The connecting portion 40 is provided at one end of the first skeleton portion 10 on the side that does not form the outer wall portion in the longitudinal direction of the plate 11, and is connected to the adjacent straight portion segment 4.
The connecting portions 40 are provided at both ends of the plate 21 of the second skeleton portion 20 in the longitudinal direction, one of which is connected to the outer piece 71 and the other of which is connected to the straight portion segment 4.
The connecting portions 40 are provided at both ends of the plate 31 of the third skeleton portion 30 in the longitudinal direction, one of which is connected to the outer piece 71 and the other to the straight portion segment 6.
The plates 21 of the second skeleton portion 20 of the segment pieces 71 and 72 are connected to each other with their wall surfaces along the outer wall surfaces of the annular bodies 1 and 2, and the third skeleton of the segment pieces 71 and 72. The plates 31 of the portions 30 are connected to each other with their wall surfaces along the inner wall surfaces of the annular bodies 1 and 2.

(Reinforcement part)
As shown in FIGS. 5 to 10, the reinforcing portion 73 reinforces the corner portion segment 3, and releases the tensile force acting on the corner portion to the main girder or the like to release the bending strength of the corner portion segment 3. And prevent damage. Further, the reinforcing portion 73 has a function of enhancing the integrity with the filling material 51 to be cast.
Reinforcing portion 73 is, for example, a rod-like member made of a reinforcing bar, a cross-sectional area, for ^example, is preferably 19.05mm ² ~50.8mm 2, may in particular is 31.8mm ^2.
The reinforcing portion 73 connects the first skeleton portion 10 and the second skeleton portion 20 and connects the first skeleton portion 10 and the third skeleton portion 30 in one outer piece 71 and the inner piece 72. Further, the reinforcing portion 73 connects the first skeleton portion 10 and the second skeleton portion 20 between the outer piece 71 and the inner piece 72 to be connected, and connects the first skeleton portion 10 and the third skeleton portion 20. The parts 30 are connected.

As shown in FIGS. 5 to 10, some of the reinforcing portions 73a of the reinforcing portions 73 are connected to the stiffeners 14, 24, 34 via the fastening plate 74 at both ends. The fastening plate 74 is a plate material that is bent and formed in a dogleg shape when viewed from the side surface, and is joined to both ends of the reinforcing portion 73a by welding or the like. The fastening plate 74 is connected to the stiffeners 14, 24, 34 by bolts and nuts. Here, the fastening plate 74 is bent so that the extending direction of the reinforcing portion 73a intersects with respect to the surface direction of the two outer wall surfaces forming the corner portions at an angle of 45 °. This is for arranging the reinforcing portion 73a. That is, the reinforcing portion 73a is obliquely oriented so as to form the remaining hypotenuse of a right triangle composed of two sides forming a corner portion in the cross-sectional direction and perpendicular to the axial direction of the underground structure 100. It is provided extending to. In other words, the reinforcing portion 73a is arranged along a straight line J orthogonal to the straight line I connecting the apex G of the corner portion on the outer wall side and the apex H of the corner portion on the inner wall side. The reinforcing portions 73a are arranged so that their extending directions are parallel to each other. The reinforcing portions 73a are arranged at equal intervals from each other.
Here, as shown in FIGS. 4 and 5, the apex G of the corner portion on the outer wall side is on the outer piece 71 in the annular body 1, and the apex H of the corner portion on the inner wall side is the inner piece in the annular body 1. It is on 72.
One end of a part of the reinforcing portion 73b is connected to the stiffeners 14 and 34 via the fastening plate 74. The other end of the reinforcing portion 73b is curved and formed in a hook shape, and is locked to a locking plate 75 provided on the plate 31 of the third skeleton portion 30 in the outer plate 71 and the inner plate 72. .. Here, the locking plate 75 is a plate material erected at a right angle to the outer surface of the plate 31, and a locking portion 75a such as an elongated hole or a recess is formed. The reinforcing portion 73b is connected to the stiffener 14 of the outer piece 71 via the fastening plate 74 in a state where the other end formed in the shape of a hook is locked to the locking portion 75a. The reinforcing portion 73b is arranged along a straight line J orthogonal to a straight line I connecting the apex G of the corner portion on the outer wall side and the apex H of the corner portion on the inner wall side. The reinforcing portions 73b are arranged so that their extending directions are parallel to each other. The reinforcing portions 73b are arranged at equal intervals from each other.
A part of the reinforcing portion 73c connects the stiffener 14 of the outer piece 71 and the stiffener 14 of the inner piece 72 so that the extending direction thereof is perpendicular to the extending direction of each main girder 12. is doing. That is, the reinforcing portion 73c is arranged along the extending direction of the second skeleton portion 20 and the third skeleton portion 30. The extending directions of the reinforcing portions 73 (73a to 73c) intersect with respect to the extending directions of the first skeleton portion 10, the second skeleton portion 20, and the third skeleton portion 30. Further, among the reinforcing portions 73, the reinforcing portion 73a is arranged in a rectangular region surrounded by the first skeleton portion 10, the second skeleton portion 20, and the third skeleton portion 30, and the reinforcing portion 73 is arranged. 73b and 73c are arranged outside the rectangular area.

Further, as shown in FIG. 6, a bearing plate 76 for preventing the filling material 51 to be cast from being locally crushed is provided on the inner surface of the plate 11 in the first skeleton portion 10 of the inner piece 72. It is joined by welding or the like. Specifically, the bearing plate 76 is provided on the back surface of the surface of the adjacent straight portion segment 4 where the joint plates 93 of the outer piece 81 and the inner piece 82 come into contact with each other.
Further, in the inner piece 72, in the region of the plate 11 forming the inner wall surface of the annular bodies 1 and 2, the excavator 110 excavates the ground inside the annular bodies 1 and 2 when the annular bodies 1 and 2 are buried (FIG. Two rails 50 are provided to guide the movement (see 1 to FIG. 3) and to take a reaction force at the time of excavation. As shown in FIGS. 1, 4, and 11, the rail 50 is formed in a T-shape in cross section. For example, the rail 50 is welded or the like to a position facing a part of the stiffener 14 with the plate 11 in between. It is joined. The rail 50 is continuously provided over a plurality of annular bodies 1 and 2 which are stacked and connected in the height direction of the underground structure 100, and extends along the height direction of the plate 11. is doing. Here, it is preferable that the rail 50 is provided in the vicinity of the corner portion on the inner wall side of the annular bodies 1 and 2. This is because it is difficult to excavate the ground near the corner by a large excavator 120 equipped with a clamshell or the like (see FIG. 1), so that the excavator 110 can easily excavate the corner. Is.

Here, as shown in FIG. 6, the length of the second skeleton portion 20 in the outer piece 71, that is, one end portion of the main girder 22 (the end portion joined to the main girder 12 of the first skeleton portion 10). ) from to connecting surfaces of the joint plate 23 between the second building frame portion 20 lengths L _1, the length of the third skeleton portion 30 in the outer piece 71, that is, main beam 32 one end (first the skeleton portion 10 from the end) which is joined to the main girder 12 to the coupling surface between the joint plate 33 in the third building frame portion 30 the length and L _2. Further, the length of the second skeleton portion 20 in the inner piece 72, that is, from one end portion of the main girder 22 (the end portion joined to the main girder 12 of the first skeleton portion 10) to the second skeleton portion 20. The length of the joint plates 23 to the connecting surface is L ₃ , the length of the third skeleton 30 in the inner piece 72, that is, one end of the main girder 32 (to the main girder 12 of the first skeleton 10). the length from the end) which is joined to the coupling surface between the joint plate 33 in the third skeleton portion 30 and L _4. In order to make the drawing easier to understand, in FIG. 6, the outer piece 71 and the inner piece 72 are drawn in a state of being separated by the same distance from the bisector V that divides the width of the corner segment into equal parts.
When the lengths L _{1 to} L ₄ are defined as described above, the corner segment structure 5 of the corner segment 3 is in the width direction (direction orthogonal to the length direction of the first skeleton portion 10). It is divided into two segment pieces 71 and 72 evenly along the equal division line V passing through the center of the above, and the outer piece 71 and the inner piece 72 are configured to be freely connectable.
_{That is, the length L 1} of the second skeleton portion 20 of _{the outer piece 71, the length L 2} of the third skeleton portion 30 of the outer piece 71, and the length L 2 of the second skeleton portion 20 of the inner piece 72. _{3 and the length L 4} of the third skeleton portion 30 of the inner piece 72 are formed to have the same length (L ₁ = L ₂ = L ₃ = L ₄ ).

(Filling material)
As shown in FIG. 4, the filling material 51 is filled in the space sandwiched between the outer piece 71 and the inner piece 72, and for example, concrete, soil cement, mortar, slag, or the like is used.
When the filling material 51 is placed, the reinforcing portion 73 is buried in the filling material 51, and after the filling material 51 is solidified, the reinforcing portion 73 is integrally coupled with the filling material 51 to form a corner. The strength of the corner segment 3 is increased, and the relative positional deviation between the outer piece 71, the inner piece 72, and the filling material 51 is suppressed.

<Straight line segment>
As shown in FIGS. 5, 12, and 13, the straight line segment 4 linearly connects the corner segments 3. The straight portion segment 4 includes a straight portion segment structure 6 and a filling material 61. That is, the straight portion segment 4 is a synthetic segment in which the straight portion segment structure 6 and the filling material 61 are integrally formed.
The straight portion segment structure 6 includes two segment pieces 81 and 82 and a reinforcing portion 83. Here, the segment piece 81 forms the outer wall of the annular bodies 1 and 2, and the segment piece 82 forms the inner wall of the annular bodies 1 and 2. Hereinafter, the segment piece 81 will be referred to as an outer piece 81, and the segment piece 82 will be referred to as an inner piece 82.

(Outer piece, inner piece)
As shown in FIGS. 12 to 14, the outer piece 81 forms the outer wall surface of the underground structure 100, and the inner piece 82 forms the inner wall surface of the underground structure 100. The outer piece 81 and the inner piece 82 include a plate 91, a main girder 92, a joint plate 93, a stiffener 94, and a connecting portion 95.

The plate 91 forms the outer wall surface of the annular bodies 1 and 2, and is formed in a rectangular shape. The plate 91 is formed of, for example, a steel plate, and the plate thickness thereof is preferably, for example, 3 mm to 38 mm, and particularly preferably 9 mm. The height of the plate 91 is, for example, preferably 0.5 m to 2.5 m, more specifically 0.9 m to 1.5 m, and particularly preferably 1.0 m.

The main girder 92 is erected on the upper end edge and the lower end edge of the plate 91 in the height direction (direction in which the annular bodies 1 and 2 are stacked and connected). That is, two main girders 92 are provided on the plate 91. The main girder 92 is erected at a right angle to the inner surface of the plate 91. The main girder 92 is formed of, for example, a steel plate, and the plate thickness thereof is preferably, for example, 6 mm to 38 mm, particularly preferably 17.4 mm. The width of the main girder 92 is, for example, preferably 0.1 m to 0.5 m, and particularly preferably 0.3 m. The main girder 92 is provided with a plurality of joints 12a at predetermined intervals along the longitudinal direction (extending direction) thereof.
The joint 12a is for connecting the upper and lower annular bodies 1 and 2 to each other so as not to be relatively displaced. Specifically, the joint 12a includes a male joint and a female joint into which the male joint is inserted and locked. The male joint is provided on the main girder 92 on the upper end side of the plate 91, and is formed in a wedge shape, for example. The female joint is provided on the main girder 92 on the lower end side of the plate 91, and both joints are located concentrically with each other. The male joint is inserted into the female joint in a state where the wedge-shaped portion is elastically deformed, and is held in the female joint by the restoring force of the male joint. A known joint 12a can be used, and the joint 12a is not limited to the above configuration.

The joint plate 93 is erected at both ends of the main girder 92 in the longitudinal direction (extending direction) so as to connect both ends of the two main girders 92. The joint plate 93 is erected at a right angle to the inner surface of the plate 91. The joint plate 93 is formed of, for example, a steel plate, and the plate thickness thereof is preferably, for example, 4 mm to 38 mm, and particularly preferably 9.5 mm. The width of the joint plate 93 is preferably, for example, 0.1 m to 0.5 m, and particularly preferably 0.3 m. Further, the height of the joint plate 93 is preferably 0.5 m to 2.5 m, and particularly preferably 1.0 m.

The stiffener 94 has two functions, that is, a function of increasing the rigidity of the straight portion segment 4 and a function of attaching the reinforcing portion 83. The stiffeners 94 are erected at right angles to the inner surface of the plate 91, respectively, in parallel with the joint plate 93 at predetermined intervals along the longitudinal direction of the main girder 92. The stiffener 94 is joined to the inner surface of the plate 91 by welding or the like. The shape of the stiffener 94 is not limited as long as it enhances the rigidity of the straight portion segment 4 and enables connection with the reinforcing portion 83, respectively.
The stiffener 94 is formed of, for example, a steel plate. The plate thickness of the stiffener 94 is preferably, for example, 3 mm to 38 mm, and particularly preferably 16 mm. The width of the stiffener 94 is preferably, for example, 0.1 m to 0.5 m, and particularly preferably 0.3 m. Further, the height of the stiffener 94 is preferably, for example, 0.5 m to 2.5 m, and particularly preferably 1.0 m.
The main girder 92 and the stiffener 94 may both be joined to the plate 91 by welding, or may be partially formed integrally with the plate 91. Further, the joint plate 93 may be joined to the main girder 92 by welding, or a part thereof may be integrally formed with the main girder 92.

The connecting portion 95 has the same configuration as the connecting portion 40, and is provided at both ends of the outer plate 91. The connecting portion 95 on the corner portion segment 3 side is connected to the connecting portion 40 of the inner piece 72 of the corner portion segment 3.
The distance between the outer piece 81 and the inner piece 82 is, for example, preferably 0.4 m to 2.5 m, more specifically 1.0 m to 2.0 m, and particularly preferably 1.9 m. The distance between the inner wall and the outer wall of the underground structure 100, that is, the width of the straight portion segment 4 is preferably, for example, 0.9 m to 3.0 m, and particularly preferably 2.5 m.

(Reinforcement part)
As shown in FIGS. 5 and 12, the reinforcing portion 83 reinforces the straight portion segment 4, and releases the tensile force acting on the straight portion segment 4 to the main girder or the like to increase the bending strength of the straight portion segment 4. Raise and prevent damage. Further, the reinforcing portion 83 has a function of enhancing the integrity with the filling material 61 to be cast.
Reinforcing portion 83 is, for example, a rod-like member made of a reinforcing bar, a cross-sectional area, for ^example, is preferably 19.05mm ² ~50.8mm 2, may in particular is 31.8mm ^2.
Of the reinforcing portions 83, a part of the reinforcing portion 83a is connected to the stiffener 94 of the outer piece 81 at one end and to the stiffener 94 of the inner piece 82 at the other end. The reinforcing portion 83a also has a function as a connecting portion for connecting the outer piece 81 and the inner piece 82.
As shown in FIG. 10, the reinforcing portion 83a is arranged along a direction in which the extending direction thereof is orthogonal to the extending direction of the straight portion segment 4. That is, the reinforcing portions 83a are arranged in parallel with each other. Although the reinforcing portion 83 is connected to the stiffener 94 via the fastening plate 84, the reinforcing portion 83a may be directly connected to the stiffener 94.

As shown in FIG. 5, one end of a part of the reinforcing portion 83b is connected to the stiffener 94 of the outer piece 81 via the fastening plate 74. As shown in FIGS. 8 and 9, the other end of the reinforcing portion 83b is curved and formed in a hook shape, and the outer surface of the plate 11 of the first skeleton portion 10 in the inner plate 72 of the corner segment 3 is formed. It is locked to a locking plate 75 provided on the. Here, the locking plate 75 is a plate material erected at a right angle to the outer surface of the plate 11, and a locking portion 75a such as an elongated hole or a recess is formed. The reinforcing portion 83b is connected to the stiffener 94 of the outer piece 81 via the fastening plate 74 in a state where the other end formed in the shape of a hook is locked to the locking portion 75a.
The reinforcing portion 83b is arranged along a straight line J orthogonal to a straight line I connecting the apex G of the corner portion on the outer wall side and the apex H of the corner portion on the inner wall side. The reinforcing portions 83b are arranged so that their extending directions are parallel to each other. The reinforcing portions 83b are arranged at equal intervals from each other.

(Filling material)
As shown in FIG. 4, the filling material 61 is filled in the space sandwiched between the outer piece 81 and the inner piece 82, and for example, concrete, soil cement, mortar, slag, or the like is used.
When the filling material 61 is placed, the reinforcing portion 83 is buried in the filling material 61, and after the filling material 61 is solidified, the reinforcing portion 83 is integrally coupled with the filling material 61 to form a straight line. The strength of the portion segment 4 is increased, and the relative positional deviation between the outer piece 81, the inner piece 82, and the filling material 61 is suppressed.

<Arrangement of reinforcements for each segment>
Here, the relationship between the reinforcing portions 73a, 73b, 73c, 83a, 83b arranged along the straight line J orthogonal to the straight line I will be described.
The reinforcing portions 73a, 73b, 83b are all arranged on the straight line J, and the reinforcing portions 73a, 73b, 83b are arranged on the straight lines J different from each other. Some of the reinforcing portions 73a, 73b, and 83b may be arranged on the same straight line J, or all of them may be arranged on the same straight line J. In particular, when all of the reinforcing portions 73a, 73b, 83b are arranged on the same straight line J, the tensile force acting on the reinforcing portions 73a, 73b, 83b is smoothly transmitted, which is more preferable.
Further, in order to evenly disperse the acting tensile force, it is preferable that the reinforcing portions 73a, the reinforcing portions 73b, and the reinforcing portions 83b are parallel to each other.
Further, in order to evenly disperse the acting tensile force, it is preferable that each reinforcing portion 73a, each reinforcing portion 73b, and each reinforcing portion 83b are parallel to each other.
Further, in order to improve the construction efficiency, it is preferable that the reinforcing portions 73a, the reinforcing portions 73b, the reinforcing portions 73c, the reinforcing portions 83a, and the reinforcing portions 83b are arranged at equal intervals. It should be noted that the reinforcing portions 73a, 73b, 73c, 83a, 83b are not limited to the case where all of the reinforcing portions are evenly spaced, and in the region where a large tensile force acts, the spacing between the reinforcing portions is larger than that of the other regions. It may be made smaller. Specifically, the distance between the adjacent reinforcing portions may be reduced as the apex G of the corner portion on the outer wall side and the apex H of the corner portion on the inner wall side are approached.

As described above, according to the underground structure 100 constructed by stacking and connecting the annular bodies 1 and 2 in the axial direction (height direction), the straight lines of the annular bodies 1 and 2 having a rectangular cross section. By connecting the outer pieces 71 and 81 and the inner pieces 72 and 82 at both the corner portion and the corner portion, the corner portion segment 3 and the straight portion segment 4 are formed. As a result, even when constructing with a large cross section, the outer pieces 71, 81 and the inner pieces 72, 82 are separately manufactured and transported to the construction site, assembled at the construction site, and the filling materials 51, 61 are placed. Can be constructed into large synthetic segments. Therefore, it is possible to cope with the construction with a large cross section, and it is possible to suppress the decrease in the construction efficiency.
Further, since the outer piece 81 and the inner piece 82 forming the straight portion segment 4 are not curved and each portion extends in a straight line, the outer piece 81 and the inner piece 82 are stacked and loaded on a transportation device such as a truck during transportation. It can be and the transportation efficiency is high.
On the other hand, if the outer piece 71 and the inner piece 72 forming the corner portion of the rectangular cross section forming the corner portion segment 3 are also stacked by shifting them in the longitudinal direction, they are compact for transportation equipment such as trucks during transportation. Can be loaded on.
Further, the second skeleton portion 20 and the third skeleton portion 30 of the outer piece 71 and the second skeleton portion 20 and the third skeleton portion 30 of the inner piece 72 all have the same length (one type of length). Only), and the outer piece 71 and the inner piece 72 are connected at the center of the corner segment 3 in the width direction. As a result, the outer piece 71 and the inner piece 72 are connected at the position farthest from the corner of the corner segment 3, and the durability against external forces such as bending moment acting on the corner segment 3 is maximized. It can be an enhanced configuration.
Further, since the space required for the loading platform when loading the segment pieces 71 and 72 on a transportation device such as a truck is determined by the maximum width of the segment pieces 71 and 72, the second skeleton portions 20 and the second of the segment pieces 71 and 72 It is preferable that the skeleton portion 30 of No. 3 is configured so as not to protrude from the bisector V as much as possible when the segment pieces 71 and 72 are connected. In this respect, in the segment pieces 71 and 72 as shown in FIG. 6, since all the second skeleton portions 20 and the third skeleton portions 30 do not protrude from the bisector V, the width required for loading is the largest. It can be made smaller.
Further, by forming all of the second skeleton portion 20 and the third skeleton portion 30 with the same length of one type, the construction period and cost at the time of manufacturing can be minimized.
Therefore, it is the most desirable configuration to form all of the second skeleton portion 20 and the third skeleton portion 30 with the same length of one type.

Further, in the corner segment 3, the connection between the outer piece 71 and the inner piece 72 is at least on the extension line of the plate 91 of the outer piece 81 in the straight segment 4 forming the outer wall of the underground structure 100, and in the ground. This is done at two locations on the extension line of the plate 91 of the inner piece 82 in the straight section segment 4 forming the inner wall of the structure 100. As a result, the force can be efficiently transmitted to the outer piece 71 and the inner piece 72 extending in a straight line, and the bending moment in the cross-sectional direction generated in the corner portion is resisted by an economical and simple structure. can do.
Further, the corner segment 3 includes a second skeleton 20 and a third skeleton 30, and since they are connected to each other, the strength of the corner segment 3 can be increased and the corner segment 3 can be bent. The number of reinforcing portions 73, 83 provided to withstand the moment can be reduced. Further, the reinforcing portions 73 and 83 can be made thinner.

Further, the reinforcing portion 73 forms the remaining hypotenuse of a right triangle composed of two sides forming a rectangular cross-sectional corner portion in the cross-sectional direction and perpendicular to the axial direction of the underground structure 100. It is installed diagonally. As a result, it is possible to effectively reinforce the bending moment in the cross-sectional direction generated in the corner portion.
For example, as shown in FIG. 15, when a bending moment acts in the direction in which the corner portion closes, the straight line I connecting the apex G of the corner portion on the outer wall side and the apex H of the corner portion on the inner wall side A tensile force acts on the outer wall side and a compressive force acts on the inner wall side in the direction of the cross section forming a right angle. Here, the filling material 51 contributes to the compressive force, and the reinforcing portion 73 on the outer wall side contributes to the tensile force.
On the other hand, as shown in FIG. 16, when a bending moment acts in the direction in which the corner portion opens, the straight line I connecting the apex G of the corner portion on the outer wall side and the apex H of the corner portion on the inner wall side A compressive force acts on the outer wall side and a tensile force acts on the inner wall side in the direction of the cross section forming a right angle. Here, the filling material 51 contributes to the compressive force, and the reinforcing portion 73 on the inner wall side contributes to the tensile force.

Further, since the reinforcing portions 73b and 83b are arranged so that their extending directions are parallel to the reinforcing portions 73a, the outer wall side generated when a bending moment acts in the opening direction and the closing direction of the corner portion. The tensile force in the cross-sectional direction perpendicular to the straight line I connecting the apex G of the corner portion and the apex H of the corner portion on the inner wall side is transmitted and dispersed through the plurality of reinforcing portions 73b and 83b. Because it will be done, the corners will be reinforced. Further, since one end of the reinforcing portions 73b and 83b can be hooked on the locking portion 75a (long hole or the like) of the locking plate 75 and connected, the construction error at the construction site can be absorbed by the locking plate 75. Easy to install.

In addition, the heights and intervals of the outer pieces 71, 81 and the inner pieces 72, 82 in the corner segment 3 and the straight segment 4 are set according to the heights and intervals of the outer pieces 71, 81 and the inner pieces 72, 82 of the Occupational Safety and Health Regulations, Article 552, Paragraph 1, Item 4 (a) and 570, 571. If appropriately selected based on the provisions of the Article, the work burden of assembling the annular bodies 1 and 2 can be significantly reduced while maintaining the safety. Specifically, assembling the annular bodies 1 and 2 in which the operator enters between the outer pieces 71 and 81 and the inner pieces 72 and 82 of the corner segment 3 or the straight segment 4 and stacks and connects them on top of each other. Since the work can be performed, it is not necessary to separately provide a scaffold for the assembly work. That is, the outer pieces 71, 81, the inner pieces 72, 82, and the solidified filling material 51 of both the corner segment 3 and the straight segment 4 can be used as scaffolding for assembling the annular bodies 1 and 2. .. Further, it is possible to surely prevent the operator from accidentally falling outward from between the outer pieces 71, 81 and the inner pieces 72, 82 of the corner segment 3 or the straight segment 4, and the work safety. Also improves. In particular, if the inner pieces 72 and 82 of both the corner segment 3 and the straight segment 4 are assembled in advance, it is possible to reliably prevent the underground structure from falling to the inner air side.

Further, in the corner segment 3, the portion where the skeletons 20 and 30 are connected to the first skeleton 10 can be manufactured in advance at the factory, which is restricted from the factory in terms of equipment and environment. Since it is not necessary to connect the corner segment structures 5 at the construction site where there are many cases, even if the corner segment structure 5 of the corner segment 3 is divided into the outer piece 71 and the inner piece 72, high quality can be maintained as a segment. Further, since the corner portion of the corner portion segment 3 can be manufactured at the factory, the durability and reliability of the corner portion segment 3 can be improved.
For example, the corner segment 300 as shown in FIG. 26 and the corner segment 3 are compared. The corner segment 300 has an outer piece 710 and an inner piece 720. The outer piece 710 has a first skeleton portion 10a and a second skeleton portion 20a provided so as to be orthogonal to the first skeleton portion 10a. The inner piece 720 has a first skeleton portion 10a and a third skeleton portion 30a provided so as to be orthogonal to the first skeleton portion 10a. The outer piece 710 and the inner piece 720 are separately transported to the construction site and connected to each other at the corners W and Z at the construction site.

Here, in order to exhibit high durability against an external force such as a bending moment acting on the corner segment 300, all the corners W, X, Y, Z must be manufactured in advance at the factory. However, in the corner segment 300, since it is necessary to connect the corners W and Z at the construction site, there is a limit in improving durability and reliability.
On the other hand, the corner segment 3 separately transports the outer piece 71 and the inner piece 72 to the construction site and connects them to each other at the construction site. In each of the pieces 71 and 72, the first skeleton portion 10 The second skeleton portion 20, the first skeleton portion 10, and the third skeleton portion 30 are connected in advance at the factory. That is, since all the corner portions W, X, Y, Z of the corner portion segment 3 can be connected at the factory, the corner portions W, X, Y, Z like the corner portion segment 300. Is not connected at the construction site. Therefore, the durability and reliability of the corner segment 3 can be improved.

<Others>
The present invention is not limited to the above-described embodiment.
Plates 11,21,31, main girders 12,22,32, joint plates 13,23,33, stiffeners 14,24,34, connecting parts 40,95, reinforcements that make up each skeleton part 10,20,30 The number, shape, and installation position of the parts 73 and 83 can be freely changed as long as the strength as a segment is satisfied.
Further, the angles of the reinforcing portions 73 and 83 with respect to the respective skeleton portions 10, 20 and 30 can be freely changed within a range in which the reinforcing function of the segment is exhibited. For example, as shown in FIG. 17, when the corners of the annular body are not at right angles (specifically, when the annular body is formed in a polygonal shape other than a quadrangle), the outer piece of the corner segment 3a. The second skeleton portion 20 and the third skeleton portion 30 do not intersect at right angles to the first skeleton portion 10 in the 71a and the inner piece 72a, and the second skeleton portion 20 and the third skeleton portion 20 do not intersect. One end of the portion 30 is connected to the first skeleton portion 10 at an acute angle (or an obtuse angle). The outer piece 71a of the corner segment 3a is formed shorter than the inner piece 72a, and the outer piece 81a of the straight segment 4a is formed shorter than the inner piece 82a. In FIG. 17, the same reference numerals are given to the same configurations as those in the above-described embodiment shown in FIG.
Even with such a configuration, the reinforcing portions 73a and 73b are formed along a straight line J forming a right angle to the straight line I connecting the apex G of the corner portion on the outer wall side and the apex H of the corner portion on the inner wall side. , 83b is preferably arranged. In FIG. 17, some reinforcing portions 73b and 83b are arranged side by side on the same straight line J, and some reinforcing portions 73a, 73b and 83b are arranged side by side on the same straight line J. ..
The remaining reinforcing portions 73c and 83a are preferably arranged along the direction orthogonal to the extending direction of the outer pieces 71a and 81a and the inner pieces 72a and 82a, as in the above embodiment. By arranging the reinforcing portions 73 and 83 in this way, the effects described in paragraphs [0073] and [0074] can be obtained regardless of the angles of the reinforcing portions 73 and 83 with respect to the respective skeleton portions 10, 20 and 30. Can be done.

The number of corners of the annular bodies 1 and 2 constituting the underground structure 100 can also be freely changed. For example, the annular bodies 1 and 2 can be formed not only as a rectangle as in the above embodiment but also as a triangle, a pentagon, a hexagon, or the like.
The second skeleton portion 20 and the third skeleton portion 30 in the outer pieces 71, 81 and the inner pieces 72, 82 of the annular bodies 1 and 2 do not necessarily have to be formed to have the same length, and the first skeleton portion 10 The lengths of the second skeleton portion 20 and the third skeleton portion 30 can be changed so that the extending directions of the two are parallel to each other.
A partition plate may be provided at the seam (boundary) of adjacent segments. In this case, the partition plate is provided so as to connect the joint plates 13, 23, 33 facing each other in the outer pieces 71, 81 and the inner pieces 72, 82. As a result, the strength of the annular bodies 1 and 2 can be increased, and the filling materials 51 and 61 can be concentrated in a specific segment.

In the above embodiment, the lengths L ₁ , L _{3 of the second skeleton portion 20 and the lengths L 2} , L ₄ of the third skeleton portion 30 are all the same length (only one type of length). ), But _{the relationship of each length L 1} , L ₂ , L ₃ , L ₄ is not limited to this. For example, the second skeleton portion 20 and the third skeleton portion 30 may have a configuration as shown in the following modification. In FIGS. 18 to 25 showing modification examples, the same configurations as those of the above-described embodiment shown in FIG. 6 will be described with the same reference numerals. In order to make the drawings easier to understand, in FIGS. 18 to 25, the outer piece 71 and the inner piece 72 are drawn in a state of being separated by the same distance from the bisector V that divides the width of the corner segment into equal parts. There is.
In the following modification, the length that does not exceed the bisector V when the outer piece 71 and the inner piece 72 are connected means, in other words, the main girder of the outer piece 71 when the outer piece 71 and the inner piece 72 are connected. It is a length shorter than half the length of the distance between the end portion of the inner piece 72 on the inner piece 72 side and the end portion of the main girder 12 of the inner piece 72 on the outer piece 71 side.
Further, the length exceeding the bisector V when the outer piece 71 and the inner piece 72 are connected means, in other words, the length on the inner piece 72 side of the main girder 12 of the outer piece 71 when the outer piece 71 and the inner piece 72 are connected. It refers to a length longer than half the length of the distance between the end portion and the end portion on the outer piece 71 side of the main girder 12 of the inner piece 72.
Further, the length at which the tip of the second skeleton portion 20 or the third skeleton portion 30 is located on the bisector V when the outer piece 71 and the inner piece 72 are connected is, in other words, the length between the outer piece 71 and the inner piece. When the 72 is connected, it is equal to half the length of the distance between the end of the outer piece 71 on the main girder 12 on the inner piece 72 side and the end of the inner piece 72 on the main girder 12 on the outer piece 71 side. The length.

(Modification example 1)
For example, it may be a corner segment 3b as shown in FIG. In corner segments 3b, the length L ₁ of the second building frame portion 20 of the outer piece 71 is formed to a length that when connecting the outer piece 71 and the inner piece 72 does not exceed the bisector V, outer _{The length L 2} of the third skeleton portion 30 of the piece 71 is formed to have a length extending toward the inner piece 72 beyond the bisector V when the outer piece 71 and the inner piece 72 are connected. _{The length L 3} of the second skeleton portion 20 of the inner piece 72 is formed to have a length extending toward the outer piece 71 beyond the bisector V when the outer piece 71 and the inner piece 72 are connected. the length of the third skeleton portion 30 of the piece 72 L ₄ is formed to a length not exceeding bisector V when connecting the outer piece 71 and the inner piece 72.
Here, there are a total of two types of lengths of the second _{skeleton portion 20 and the third skeleton portion 30, the length L 1} of the second skeleton portion 20 of the outer piece 71 and the third skeleton of the inner piece 72. _{The length L 4} of the portion 30 is formed to have the same length, and the length L _{2 of the third skeleton portion 30 of the outer piece 71 and the length L 3} of the second skeleton portion 20 of the inner piece 72. Are formed to the same length. Therefore, when the outer piece 71 and the inner piece 72 are connected, the total length of the connected second skeleton portion 20 and the total length of the connected third skeleton portion 30 are the same length. The connecting portion between the second skeletons 20 is located on the outer piece 71 side of the bisector V, and the connecting portion between the third skeletons 30 is located on the inner piece 72 side of the bisector V. do.

(Modification 2)
For example, it may be a corner segment 3c as shown in FIG. In corner segments 3c, the length L ₁ of the second building frame portion 20 of the outer piece 71 is formed extending to the inner piece 72 when connecting the outer piece 71 and the inner piece 72 beyond the bisector V Length _{The length L 2} of the third skeleton portion 30 of the outer piece 71 is formed to have a length that does not exceed the bisector V when the outer piece 71 and the inner piece 72 are connected. _{The length L 3} of the second skeleton portion 20 of the inner piece 72 is formed to have a length that does not exceed the bisector V when the outer piece 71 and the inner piece 72 are connected, and the third skeleton of the inner piece 72. The length L ₄ of the portion 30 is formed to have a length extending beyond the bisector V to the outer piece 71 when the outer piece 71 and the inner piece 72 are connected.
Here, there are a total of two types of lengths of the second _{skeleton portion 20 and the third skeleton portion 30, the length L 1} of the second skeleton portion 20 of the outer piece 71 and the third skeleton of the inner piece 72. _{The length L 4} of the portion 30 is formed to have the same length, and the length L _{2 of the third skeleton portion 30 of the outer piece 71 and the length L 3} of the second skeleton portion 20 of the inner piece 72. Are formed to the same length. Therefore, when the outer piece 71 and the inner piece 72 are connected, the total length of the connected second skeleton portion 20 and the total length of the connected third skeleton portion 30 are the same length. The connecting portion between the second skeletons 20 is located on the inner piece 72 side of the bisector V, and the connecting portion between the third skeletons 30 is located on the outer piece 71 side of the bisector V. do.

(Modification example 3)
For example, it may be a corner segment 3d as shown in FIG. In corner segment 3d, the length L ₁ of the second building frame portion 20 of the outer piece 71 is formed extending to the inner piece 72 when connecting the outer piece 71 and the inner piece 72 beyond the bisector V Length are, the length L ₂ of the third skeleton portion 30 of the outer piece 71 is formed to extend to the inner piece 72 when connecting the outer piece 71 and the inner piece 72 beyond the bisector V length .. _{The length L 3} of the second skeleton portion 20 of the inner piece 72 is formed to have a length that does not exceed the bisector V when the outer piece 71 and the inner piece 72 are connected, and the third skeleton of the inner piece 72. The length L ₄ of the portion 30 is formed to have a length that does not exceed the bisector V when the outer piece 71 and the inner piece 72 are connected.
Here, there are a total of two types of lengths of the second _{skeleton portion 20 and the third skeleton portion 30, the length L 1} of the second skeleton portion 20 of the outer piece 71 and the third skeleton of the outer piece 71. _{The length L 2} of the portion 30 is formed to have the same length, and the length L _{3 of the second skeleton portion 20 of the inner piece 72 and the length L 4} of the third skeleton portion 30 of the inner piece 72. Are formed to the same length. Therefore, when the outer piece 71 and the inner piece 72 are connected, the total length of the connected second skeleton portion 20 and the total length of the connected third skeleton portion 30 are the same length. The connecting portion between the second skeletons 20 is located on the inner piece 72 side of the bisector V, and the connecting portion between the third skeletons 30 is located on the inner piece 72 side of the bisector V. do.

(Modification example 4)
For example, the corner segment 3e as shown in FIG. 21 may be used. In corner segments 3e, the length L ₁ of the second building frame portion 20 of the outer piece 71 is formed to a length that when connecting the outer piece 71 and the inner piece 72 does not exceed the bisector V, outer _{The length L 2} of the third skeleton portion 30 of the piece 71 is formed to have a length that does not exceed the bisector V when the outer piece 71 and the inner piece 72 are connected. _{The length L 3} of the second skeleton portion 20 of the inner piece 72 is formed to have a length extending beyond the bisector V to the outer piece 71 when the outer piece 71 and the inner piece 72 are connected, and the inner piece 72 is formed. third length L ₄ of the skeleton portion 30 of is formed extending to the inner piece 72 when connecting the outer piece 71 and the inner piece 72 beyond the bisector V length.
Here, there are a total of two types of lengths of the second _{skeleton portion 20 and the third skeleton portion 30, the length L 1} of the second skeleton portion 20 of the outer piece 71 and the third skeleton of the outer piece 71. _{The length L 2} of the portion 30 is formed to have the same length, and the length L _{3 of the second skeleton portion 20 of the inner piece 72 and the length L 4} of the third skeleton portion 30 of the inner piece 72. Are formed to the same length. Therefore, when the outer piece 71 and the inner piece 72 are connected, the total length of the connected second skeleton portion 20 and the total length of the connected third skeleton portion 30 are the same length. The connecting portion between the second skeletons 20 is located on the outer piece 71 side of the bisector V, and the connecting portion between the third skeletons 30 is located on the outer piece 71 side of the bisector V. do.

(Modification 5)
For example, it may be a corner segment 3f as shown in FIG. In corner segments 3f, the length L ₁ of the second building frame portion 20 of the outer piece 71 is formed to a length that when connecting the outer piece 71 and the inner piece 72 does not exceed the bisector V, outer _{The length L 2} of the third skeleton portion 30 of the piece 71 is the length at which the tip end portion of the third skeleton portion 30 of the outer piece 71 is located on the bisector V when the outer piece 71 and the inner piece 72 are connected. Is formed in. _{The length L 3} of the second skeleton portion 20 of the inner piece 72 is formed to have a length extending beyond the bisector V to the outer piece 71 when the outer piece 71 and the inner piece 72 are connected, and the inner piece 72 is formed. third length L ₄ of the skeleton portion 30 of the formed length that the distal end portion of the third skeleton portion 30 of the outer piece 71 when connecting the outer piece 71 and the inner piece 72 is positioned on the bisectrix V Has been done.
Here, there are a total of three types of lengths of the second skeleton portion 20 and the third skeleton portion 30, the length L ₁ of the second skeleton portion 20 of the outer piece 71 and the second skeleton of the inner piece 72. _{The length L 3} of the portion 20 and the length _{L 2} of the third skeleton portion 30 of the outer piece 71 _{or the length L 4} of the third skeleton portion 30 of the inner piece 72 are formed to be different lengths. There is. The length L _{2 of the third skeleton portion 30 of the outer piece 71 and the length L 4} of the third skeleton portion 30 of the inner piece 72 are formed to have the same length, and the second skeleton portion 30 of the outer piece 71 is formed to have the same length. the length _{L 1} of the skeleton portion 20, length plus the length _{L 3} of the second building frame portion 20 of the inner piece 72 _(L 1 + _{L 3)} is the third skeleton portion 30 of the outer piece 71 It corresponds to twice _{the length L 2 or the length L 4} of the third skeleton 30 of the inner piece 72. Therefore, when the outer piece 71 and the inner piece 72 are connected, the total length of the connected second skeleton portion 20 and the total length of the connected third skeleton portion 30 are the same length. The connecting portion between the second skeleton portions 20 is located on the outer piece 71 side of the bisector V, and the connecting portion between the third skeleton portions 30 is located on the bisector V.

(Modification 6)
For example, it may be a corner segment 3g as shown in FIG. 23. In corner segment 3g, the length L ₁ of the second building frame portion 20 of the outer piece 71 is formed extending to the inner piece 72 when connecting the outer piece 71 and the inner piece 72 beyond the bisector V Length are, the length L ₂ of the third skeleton portion 30 of the outer piece 71, the tip portion of the outer piece 71 and the third skeleton portion 30 of the outer piece 71 when connecting the inner piece 72 on bisectrix V It is formed to a length located at. _{The length L 3} of the second skeleton portion 20 of the inner piece 72 is formed to have a length that does not exceed the bisector V when the outer piece 71 and the inner piece 72 are connected, and the third skeleton of the inner piece 72. The length L ₄ of the portion 30 is formed so that the tip end portion of the third skeleton portion 30 of the outer piece 71 is located on the bisector V when the outer piece 71 and the inner piece 72 are connected.
Here, there are a total of three types of lengths of the second skeleton portion 20 and the third skeleton portion 30, the length L ₁ of the second skeleton portion 20 of the outer piece 71 and the second skeleton of the inner piece 72. _{The length L 3} of the portion 20 and the length _{L 2} of the third skeleton portion 30 of the outer piece 71 _{or the length L 4} of the third skeleton portion 30 of the inner piece 72 are formed to be different lengths. There is. The length L _{2 of the third skeleton portion 30 of the outer piece 71 and the length L 4} of the third skeleton portion 30 of the inner piece 72 are formed to have the same length, and the second skeleton portion 30 of the outer piece 71 is formed to have the same length. the length _{L 1} of the skeleton portion 20, length plus the length _{L 3} of the second building frame portion 20 of the inner piece 72 _(L 1 + _{L 3)} is the third skeleton portion 30 of the outer piece 71 It corresponds to twice _{the length L 2 or the length L 4} of the third skeleton 30 of the inner piece 72. Therefore, when the outer piece 71 and the inner piece 72 are connected, the total length of the connected second skeleton portion 20 and the total length of the connected third skeleton portion 30 are the same length. The connecting portion between the second skeleton portions 20 is located on the inner piece 72 side of the bisector V, and the connecting portion between the third skeleton portions 30 is located on the bisector V.

(Modification 7)
For example, the corner segment 3h as shown in FIG. 24 may be used. In corner segment 3h, the length L ₁ of the second building frame portion 20 of the outer piece 71, the tip portion of the second building frame portion 20 of the outer piece 71 when connecting the outer piece 71 and the inner piece 72 is equal It is formed to a length located on the line V, and the length L ₂ of the third skeleton portion 30 of the outer piece 71 exceeds the bisector V when the outer piece 71 and the inner piece 72 are connected to the inner piece. It is formed to a length extending up to 72. _{The length L 3} of the second skeleton portion 20 of the inner piece 72 is the length at which the tip end portion of the second skeleton portion 20 of the inner piece 72 is located on the bisector V when the outer piece 71 and the inner piece 72 are connected. It is formed so be, the length L ₄ of the third skeleton portion 30 of the inner piece 72 is formed to a length not exceeding bisector V when connecting the outer piece 71 and the inner piece 72.
Here, there are a total of three types of lengths of the second skeleton portion 20 and the third skeleton portion 30, and the length L ₁ of the second skeleton portion 20 of the outer piece 71 or the second skeleton portion of the inner piece 72. the length L ₃ of the 20, and the third skeleton portion length L ₂ of 30 of the outer piece 71, a third skeleton portion 30 the length L ₄ of the inner piece 72 is formed in different lengths, respectively There is. The length L _{1 of the second skeleton portion 20 of the outer piece 71 and the length L 3} of the second skeleton portion 20 of the inner piece 72 are formed to have the same length, and the third of the outer piece 71 is formed. the length _{L 2} of the building frame portion 30, the length _{L 4} and the sum length of the third skeleton portion 30 of the inner piece 72 _(L 2 + L ₄₎ is the outer piece 71 of the second building frame portion 20 It corresponds to twice _{the length L 1 or the length L 3} of the second skeleton 20 of the inner piece 72. Therefore, when the outer piece 71 and the inner piece 72 are connected, the total length of the connected second skeleton portion 20 and the total length of the connected third skeleton portion 30 are the same length. The connecting portion between the second skeleton portions 20 is located on the bisector V, and the connecting portion between the third skeleton portions 30 is located on the inner piece 72 side of the bisector V.

(Modification 8)
For example, the corner segment 3i as shown in FIG. 25 may be used. In corner segments 3i, the length L ₁ of the second building frame portion 20 of the outer piece 71, the tip portion of the second building frame portion 20 of the outer piece 71 when connecting the outer piece 71 and the inner piece 72 is equal It is formed to have a length located on the line V, and the length L ₂ of the third skeleton portion 30 of the outer piece 71 is a length that does not exceed the bisector V when the outer piece 71 and the inner piece 72 are connected. Is formed in. _{The length L 3} of the second skeleton portion 20 of the inner piece 72 is the length at which the tip end portion of the second skeleton portion 20 of the inner piece 72 is located on the bisector V when the outer piece 71 and the inner piece 72 are connected. It is formed so be, third the length L ₄ of the skeleton portion 30 of the inner piece 72 is formed extending to the outside piece 71 when connecting the outer piece 71 and the inner piece 72 beyond the bisector V length Has been done.
Here, there are a total of three types of lengths of the second skeleton portion 20 and the third skeleton portion 30, and the length L ₁ of the second skeleton portion 20 of the outer piece 71 or the second skeleton portion of the inner piece 72. the length L ₃ of the 20, and the third skeleton portion length L ₂ of 30 of the outer piece 71, a third skeleton portion 30 the length L ₄ of the inner piece 72 is formed in different lengths, respectively There is. The length L _{1 of the second skeleton portion 20 of the outer piece 71 and the length L 3} of the second skeleton portion 20 of the inner piece 72 are formed to have the same length, and the third of the outer piece 71 is formed. the length _{L 2} of the building frame portion 30, the length _{L 4} and the sum length of the third skeleton portion 30 of the inner piece 72 _(L 2 + L ₄₎ is the outer piece 71 of the second building frame portion 20 It corresponds to twice _{the length L 1 or the length L 3} of the second skeleton 20 of the inner piece 72. Therefore, when the outer piece 71 and the inner piece 72 are connected, the total length of the connected second skeleton portion 20 and the total length of the connected third skeleton portion 30 are the same length. The connecting portion between the second skeleton portions 20 is located on the bisector V, and the connecting portion between the third skeleton portions 30 is located on the outer piece 71 side of the bisector V.

As described above, an example in which there are a total of 1 to 3 types of lengths of the second skeleton portion 20 and the third skeleton portion 30 has been described, but the second skeleton portion 20 of the outer piece 71 and the inner piece 72 has been described. And all of the third skeletons 30 may have different lengths. In this case, there are a total of four types of lengths of the second skeleton portion 20 and the third skeleton portion 30. However, in the corner segment, when the first skeletons 10 are arranged in parallel, the total length of the second skeletons 20 connected to each other and the total length of the third skeletons 30 connected to each other are equal. Is required.
Further, even in the corner segment in which the corners of the annular body are not at right angles as shown in FIG. 17, there are a total of 1 to 4 types of lengths of the second skeleton 20 and the third skeleton 30. It is applicable in either case.

1,2 Annulus 3,3a, 3b, 3c, 3d, 3e, 3f, 3g, 3h, 3i Corner segment 4 Straight segment 5 Corner segment structure 6 Straight segment structure 10 First skeleton Part 11,21,31,91 Plate 12,22,32,92 Main girder 13,23,33,93 Joint plate 14,24,34,94 Stiffener 20 Second skeleton part 30 Third skeleton part 40 , 95 Connecting part 50 Rail 51,61 Filling material
71,71a, 81,81a Outer piece (segment piece)
72, 72a, 82, 82a Inner piece (segment piece)
73, 83 Reinforcing part 74 Fastening plate 75 Locking plate 76 Supporting part 100 Underground structure

Claims (11)

A segment piece that forms a corner of an annular body with a polygonal cross section that constitutes a structure.
The first skeleton portion forming the wall surface of the structure and
A second wall surface of the structure is formed, and is provided at a position different from the wall surface of the first skeleton portion so that the surface direction of the wall surface intersects the surface direction of the wall surface of the first skeleton portion. The skeleton and
A third skeleton portion provided at a position other than the end portion of the first skeleton portion on the same side as the second skeleton portion apart from the second skeleton portion.
A segment piece characterized by being equipped with. The segment piece according to claim 1, wherein when the third skeleton portion is connected to another segment piece, the third skeleton portion is connected to the third skeleton portion of the other segment piece. The segment piece according to claim 1 or 2 , wherein the second skeleton portion and the third skeleton portion have their extending directions parallel to each other. A segment structure in which a plurality of segment pieces according to any one of claims 1 to 3 are connected to each other.
The second skeleton portions of each segment piece are connected to each other with their wall surfaces along the outer wall surface of the annular body.
A segment structure characterized in that the third skeleton portions of each segment piece are connected to each other with their wall surfaces along the inner wall surface of the annular body. The first skeleton that forms the wall surface of the structure and the first skeleton portion that forms the wall surface of the structure, and the surface direction of the wall surface intersects the surface direction of the wall surface of the first skeleton portion. A polygonal shape including a second skeleton portion provided in the portion and a third skeleton portion provided in the first skeleton portion separated from the second skeleton portion to form the structure. A segment structure in which a plurality of segment pieces forming the corners of an annular body in a cross section are connected to each other.
The second skeleton portions of each segment piece are connected to each other with their wall surfaces along the outer wall surface of the annular body.
A segment structure characterized in that the third skeleton portions of each segment piece are connected to each other with their wall surfaces along the inner wall surface of the annular body. A reinforcing portion for connecting the first skeleton portion and the second skeleton portion or the third skeleton portion is provided in one segment piece or between a plurality of connected segment pieces.
The segment structure according to claim 4 or 5 , wherein the reinforcing portion is provided along a direction in which the extending direction intersects the extending directions of all the skeleton portions. The segment structure according to claim 6 , wherein a plurality of the reinforcing portions are provided, and the extending directions of the reinforcing portions are parallel to each other. A corner segment forming a corner of an annular body having a polygonal cross section that constitutes a structure.
The segment structure according to any one of claims 4 to 7.
With the filling material provided in the space sandwiched by the segment pieces in the segment structure,
A corner segment characterized by: An annular body with a polygonal cross section that constitutes a structure.
The corner segment according to claim 8 and
A straight line segment that linearly connects the corner segments and
An annular body characterized by comprising. The straight section segment
The outer piece that forms the outer wall of the structure and
The inner piece that forms the inner wall of the structure and
A connecting portion that connects the outer piece and the inner piece,
The filling material provided in the space sandwiched between the outer piece and the inner piece,
9. The annular body according to claim 9. A structure in which the annular body according to claim 9 or 10 is connected in the axial direction.
The structure is characterized in that the annular body is connected so that the seams of the corner segment or the straight segment are not overlapped between adjacent annular bodies.

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