JP2670483B2 - Joining structure of inner wall in tubular wall for lining excavation hole - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an RC
The present invention relates to a joint structure of a middle wall in a cylindrical wall assembled by segments.

[Background Art] In recent years, as a large-section shield method for constructing a large-section tunnel structure such as a railway tunnel, a so-called double-circle special-section shield method has come to be used. This method uses a shield excavator having a structure in which two cylindrical shield excavators are connected to each other, and excavates the ground or the ground into a cross-sectional shape in which two circles are partly overlapped and continuous. , Assemble RC segment (segment) on the inner surface of this excavated hole to form a cylindrical wall body, and connect a plurality of this cylindrical wall body along the hole (primary lining). After filling the filling material that fills the voids on the back of the segment, that is, between the segment and the ground, concrete is wound up on the inner surface of the primary lining (secondary lining) to support the ground by them, It is to compose the inner space of.

Conventionally, as a cylindrical wall body of this type, FIGS.
The one shown in the figure was proposed. In FIG. 7, reference numeral 1 is a main wall portion, which is formed by arcuate plate-shaped segments 2 bolted in the length direction. Joint fittings 2a are buried in each joint surface of the RC segment 2, and insertion holes 2b for inserting bolts are formed in these joint fittings 2a. Reference numerals 3 and 4 denote RC branch segments (branch segment) having a substantially Y-shaped cross section arranged above and below the tubular wall body for connecting the left and right main wall portions 1. The middle wall 5 is connected between them. Joint fittings on the joint surfaces of the branch segments 3 and 4 and the inner wall 5
3a, 4a, 5a are buried respectively, fitting metal fittings 3a, 4a,
Insertion holes 3b, 4b, 5b for inserting bolts are formed in 5a. In FIG. 7, only the surfaces of the segment 2, the branch segments 3, 4 and the inner wall 5 as viewed from the axial direction of the tubular wall body are shown, but the end surfaces connected to the circumferential direction of the tubular wall body are shown. Also, the fittings 2a, 3a, 4a, 5a are embedded respectively, and the fittings 2a, 3a, 4a, 5a are also formed with insertion holes 2b, 3b, 4b, 5b for inserting bolts, respectively. There is.

Next, the joint structure of the upper end branch segment 3 and the inner wall 5 is shown in FIGS. 8 and 9. The connection state of the lower end branch segment 4 and the inner wall 5 is the same as in FIGS. 8 and 9 if it is inverted. Fig. 8 is a front view seen from the advancing direction of excavation work.
FIG. 9 is a side view. As shown in FIG. 9, the end surfaces where the branch segment 3 and the inner wall 5 are joined are formed as horizontal surfaces and connected to the axis of the tubular wall body.

Next, an example of how to assemble the above cylindrical wall will be described with reference to FIG. First, the segments 2 are sequentially bolted to the left and right of the lower branch portion segment 4 in the circumferential direction to form left and right main wall portions 1, and then the upper branch portion segment 3 is bolted to the upper ends of the left and right openings of the main wall portion 1. After joining, the inner wall 5
Is joined between the upper branch segment 3 and the lower branch segment 4. To join the inner wall 5, the upper branch segment 3 is supported by a lifting machine (for example, an erector), and the inner wall 5 is inserted between the upper and lower branch segments 3 and 4 by another lifting machine. While adjusting the position of the bolt insertion hole, the joint fittings adjacent to each other are bolted together. That is,
As shown in FIG. 9, the fittings 3a and 5a and the fitting 4a
5a is bolted. In this way, the lining body is constructed in a ring shape in the shield machine, and each time the shield machine is dug, the tubular wall body is extended while the lining body assembled in the ring shape is bolted in the axial direction.

[Problems to be Solved by the Invention] By the way, in the joint structure of the middle wall, the joint metal parts embedded in the joint surfaces of the branch segment and the middle wall are bolted to each other to form the middle portion of the branch segment. It was connected to the wall. Further, adjacent branch segment segments and intermediate walls are also connected to each other by bolting a joint fitting similar to the above. For this reason, it is necessary to bury the joint fittings in the branch segment and the inner wall, which is troublesome.

The present invention has been made in view of the above circumstances, and is a tubular wall for lining an excavation hole, which does not use a joint fitting to connect the branch segment and the inner wall, adjacent branch segments, and the inner walls. The purpose is to realize the joint structure of the inner wall of the body.

"Means for Solving the Problems" In the present invention, the following means are taken in order to solve the above problems. That is, both of the both end surfaces that contact the upper and lower branch RC segments of the inner wall are surfaces with steps in the axial direction of the tubular wall body, and the end surfaces of the RC branch segments facing this surface are also The wall with a step in the axial direction,
These step surfaces are combined. And the branch RC
A hole is formed in the segment and the inner wall through this step in the axial direction of the cylindrical wall body, and a rod-shaped body having screws at both ends is inserted into the hole, and the branch portion is formed by the rod-shaped body and a nut. RC
Fasten the segment and inner wall.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 6 and 7. FIG. 7 is a schematic view showing a conventional tubular wall body. The following examples are improvements in the joining structure of the inner wall of this tubular wall body, and FIGS. 1 to 6 show the joining structure. It is a figure which expands and shows.

1 to 3 are views showing a first embodiment of the present invention and are enlarged views showing a state in which an upper branch segment and an inner wall are joined, but a lower branch segment and an inner wall are shown. If the connection state of is inverted, it is similar to these figures. As shown in these figures, the top branch segment 13 of the inner wall 15 is
The end face that is in contact with is formed as a step face, and the end face of the upper end branch portion segment 13 combined with this step face is also formed as a step face that fits with this step face, and these are joined together. Further, the upper branch portion 13 and the inner wall 15 are formed with holes 16 and 17 penetrating the step in the axial direction, and the inner wall 15 is formed with a window 18 for dividing the hole 17. .

Next, an example of a method of assembling the tubular wall body using the joining structure of the inner wall will be described. First, the segments 2 are circumferentially bolted to the left and right of the lower branch segment (not shown) to form the left and right main wall portions 1, and then the upper branch segment 13 is attached to the upper ends of the left and right openings of the main wall portion 1. Connect with bolts. Then, the upper end branch portion segment 13 is supported by a lifting machine, and the inner wall 15 is positioned between the upper and lower end branch portion segments.
The process so far is the same as in the case of the conventional structure. After this, the rod-shaped body (long bolt) 19 having the screws engraved at both ends is to be assembled from the window 18 of the middle wall 15 on the already assembled side (the right side in FIG. 2) (in FIG. 2). Toward the left side), sequentially insert into one hole 17, 16 and the other hole 17 and screw nuts 20 at both ends of long bolt 19, and already assembled inner wall 15, upper end branch to be assembled The partial segment 13 and the inner wall 15 to be assembled are fastened.
In this way, the lining body is constructed in a ring shape in the shield machine, and each time the shield machine is dug, the tubular wall body is extended while the lining body assembled in the ring shape is bolted in the axial direction.

In the above embodiment, a step is provided on the joint surface, holes 16 and 17 are formed to penetrate through the step in the axial direction, and the inner wall 15 and the upper and lower end branch segment to be assembled and the already assembled middle step are formed. By using long bolts 19 inserted into the holes 16 and 17 for fastening the wall 15, a fitting fitting that has been conventionally used for fastening the middle wall and the upper and lower end branch segments and fastening the adjacent middle walls to each other. Does not need Further, since one inner wall is fastened to the two branch segment adjacent to the inner wall, it is not necessary to fasten the branch segments to each other, and the joint fitting is not required here either.

4 to 6 are views showing a second embodiment of the present invention. In this embodiment, the connecting surfaces of the inner wall 25 and the upper end branch segment 23 are provided with a window 28 when combined. Thus, in both of them, the convex portion of the step surface is formed narrower than the concave portion. It should be noted that, if the joining surfaces of the inner wall 25 and the lower end branch portion segment are also upside down, it is similar to these figures. The method of assembling this structure is the same as that of the first embodiment, but the long bolts 29 fasten only the already assembled inner wall 25 and the upper end branch segment 23 to be assembled. In this embodiment, the upper branch segment 23 assembled later, the inner wall 25 assembled earlier, and the lower branch segment not shown assembled later are fastened together, and are assembled side by side in the axial direction. Since the structure is formed, it is not necessary to fasten the inner wall to the upper and lower branch portion segments, the adjacent inner wall portions, and the adjacent branch portion segments to each other, and thus the joint fitting is not required.

Although RC segments are shown in the above embodiments as arcuate plate-shaped segments forming the main wall 1, the main wall 1 may be constructed using arcuate plate-shaped segments made of steel or cast iron. .

[Advantages of the Invention] In the joining structure of the inner wall in the tubular wall body of the present invention, the both ends are screwed into a hole axially penetrating between the steps of the joining surface of the inner wall and the steps of the joining surface of the branch segment. It is not necessary to embed a joint metal fitting in the joint surface of the inner wall and the branch segment because the rod and the nut are used to fasten the inner wall and the branch segment. Further, in the present invention, by appropriately forming the shape of the formed step surface, for example, the upper end branch portion segment which is assembled later, the inner wall which is assembled earlier, and the lower end branch portion which is assembled later are assembled. There is no need to fasten the middle wall to the upper and lower branch parts, adjacent middle walls, and adjacent branch part segments because a structure in which the segments are fastened is arranged side by side in the axial direction is formed. Therefore, it is not necessary to bury joint fittings on these joint surfaces.

[Brief description of the drawings]

1 to 3 show a first embodiment of the present invention, which is an enlarged view showing a connecting state of an upper end branch RC segment and an inner wall, and FIG. 1 is from a traveling direction side of excavation work. 2 is a side view of FIG. 1 and FIG. 3 is a second view.
It is sectional drawing which follows the III-III line of a figure. Figures 4 to 6
The figure shows the second embodiment of the present invention, and is an enlarged view of the connecting state of the upper end branch portion RC segment and the inner wall.
The figure is a view seen from the advancing direction side of the excavation work, FIG. 5 is a side view with respect to FIG. 4, and FIG. 6 is a sectional view taken along the line VI-VI of FIG. 7 to 9 are views showing a conventional example, FIG. 7 is a view of a tubular wall body as viewed from the advancing direction of excavation work, and FIGS. 8 and 9 are branch portions RC. It is a figure which expands and shows the connection state of a segment and an inner wall, FIG. 8 is a front view seen from the advancing direction side of excavation work, and FIG. 9 is a side view. 1 ... main wall, 2 ... RC segment (segment), 13
...... Upper end branch RC segment (upper end branch segment), 15 …… Middle wall, 16,17 …… Hole, 19 …… Bar (long bolt), 20 …… Nut, 23 …… Upper end branch RC segment (Upper branch segment), 25 …… Middle wall, 26, 27 ……
Hole, 29 …… Bar (long bolt), 30 …… Nut.

Claims (1)

(57) [Claims] Claims: 1. A plurality of arc-shaped RC segments having the same shape are assembled for use in lining a double-shaped excavation hole,
In the state where two cylindrical main wall portions having an opening along the axial direction are formed, and these are arranged to face the opening,
The upper ends and lower ends of these openings are connected to each other through the upper branch RC segment and the lower branch RC segment, respectively, and the middle wall is joined between the upper branch RC segment and the lower branch segment described above. In the structure of the tubular wall body, both end faces that are in contact with the upper and lower branch RC segments of the inner wall are surfaces with steps in the axial direction of the tubular wall body, and the RC branch segment that faces this surface The end surface of is also a surface provided with a step in the axial direction of the tubular wall body, and while combining these stepped surfaces, the RC segment and the inner wall penetrate through this step in the axial direction of the tubular wall body. Forming a hole, and inserting a rod-shaped body with screws engraved at both ends into this hole, and fastening the branched RC segment and the inner wall with the rod-shaped body and a nut. In the tubular wall for Junction structure of the wall.