JP2847143B2 - Tubular wall for excavation hole lining - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a cylindrical wall body for covering a peripheral wall of a double circular excavation hole in which a part of a plurality of excavation holes having a circular cross section overlaps each other. It is about.

[Background Art] In recent years, as a shield method for constructing a large-section tunnel such as a railway tunnel, a so-called double-circle special-section shield method has been used.

This method uses a shielded excavator that has a structure in which a plurality of cylindrical shielded excavators are connected to each other, while excavating the ground to a cross-sectional shape in which a plurality of circles are partly overlapped and covering the surrounding wall. This is to build an industrial cylindrical wall.

The lining tubular wall has a plurality of circular plate-shaped segments (made of RC or steel) assembled along a peripheral wall of each of the plurality of circular excavation holes. A structure is generally used in which the connection is made, and furthermore, a center pillar is incorporated between the connection portions.

In such a lining tubular wall body, the connection between the ends of the main wall portion and the connection to the main wall portion of the middle pillar are usually continuous through bolt insertion holes provided at the connection end portions of each other. In this case, a bolt connection means is used in which a bolt is passed through these bolt insertion holes and tightened with a nut.

"Problems to be Solved by the Invention" However, in the case of such a tubular wall body for lining, as described above, in order to bolt-connect the main walls to each other and to the main wall of the middle pillar, first, The procedure involves connecting the main pillars and then connecting the center pillar.
Since a plurality of bolts are used for one connecting portion, there is a problem that the operation is complicated and time-consuming, and the number of bolts to be used is large and the bolt is lost.

The present invention has been made in view of the above circumstances, and a tube for lining an excavation hole that can simplify the connection of the main walls to each other and the center pillar to the main wall and can reduce the cost. It is intended to provide a shaped wall.

"Means for Solving the Problems" The present invention has been made to achieve the above-mentioned object, and has been made on a peripheral wall of a double circular drilling hole in which a plurality of circular cross-sectional drilling holes partially overlap each other. On the other hand, for each excavation hole having a circular cross section, a large number of arc-shaped segments are assembled along the peripheral wall of the excavation hole to construct a C-shaped main wall portion, and the ends of these main wall portions are connected to each other. In addition, a center pillar is incorporated between these connecting portions, and at the connecting portion, a cylindrical wall body for lining a double excavation hole in which the arcs of the main wall portion are discontinuous with each other. A pin penetrating the connecting end of each main wall portion connected to each other and the connecting end of the middle pillar to the main wall portion in the longitudinal direction of the excavation hole and communicating with each other in that state. A joint plate having a hole is provided, and each of these joint plates is The pin penetration holes are connected by pins penetrating into the respective pin penetration holes, and the pin penetration holes are formed substantially on the center line in the thickness direction of each of the main wall portions and the middle pillar, and the joint plate is formed with the excavation hole of the drilling hole. It is characterized in that, when they are overlapped in the longitudinal direction, they are communicated at the intersection of the substantially center lines in the direction of the thickness of the main wall portions and the middle pillar.

[Operation] According to the tubular wall body for lining a drilled hole of the present invention, each joint portion of the segments to be connected and the joint portion of the middle column are overlapped with each other, and one pin is inserted into the pin penetration hole formed therein. By penetrating the pins, the main walls and the middle pillar can be simultaneously connected.

Therefore, the work of connecting the main walls to each other and the main pillar to the main wall is simplified, and the work time is greatly reduced. In addition, since only one pin is required for the connecting portion, the cost can be reduced as compared with the conventional one that uses a lot of bolts and nuts.

In addition, the pin is inserted into the pin penetration hole at the connection where the arc of the main wall becomes an inflection where the arc of the main wall is discontinuous and the bending moment becomes large because of the double cylindrical wall. Since the structure is penetrated and connected, the bending moment at the connecting portion can be dispersed.

In addition, the pin penetration hole is formed substantially on the center line in the thickness direction of each main wall portion and the middle column, and when the joint plates are overlapped with each other in the length direction of the excavation hole, each main wall portion and the middle column are formed. Because it is made to communicate with the intersection of the approximate center line in the thickness direction, the bending moment in two directions that may be generated at the connecting point between the main wall and the middle pillar due to the double cylindrical wall is ensured. Can be dispersed.

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

FIG. 1 shows a cross section of a tunnel in which primary lining has been performed by a lining tubular wall body according to the present embodiment. In the figure, reference numeral 1 denotes ground, and 2 denotes ground 1 excavated by a shield excavator. It is a drilled hole formed by In this case, the shield excavator is 2
Thus, the cross section of the drilling hole 2 is such that two drilling holes 2a, 2a having a circular cross-section partially overlap each other. Reference numeral 3 denotes the lining tubular wall.

The tubular wall body 3 for lining is formed in a C-shape (although the right-hand excavation hole 2a in the figure is an inverted C-shape) along the peripheral wall of each of the excavation holes 2a. Walls 4, 4
And a middle pillar 5 incorporated between the two connecting portions of the main wall portions 4, 4.

The main wall portion 4 includes a plurality of arc-shaped plate-shaped RC segments (hereinafter referred to as RC segments) 6.
It is assembled along the peripheral wall. Each CR segment 6
Bolt insertion holes 7a at regular intervals on the four end faces
The joint fitting 7 formed with is embedded. The RC segments 6 are connected to each other along the peripheral wall of the excavation hole 2a by jointing the joint fittings 7 on both end surfaces in the length direction using the bolt insertion holes 7a. The main wall portion 4 is configured.

The middle pillar 5 has a prismatic shape having the same depth dimension as the width of the RC segment 6, and both ends thereof are connected to upper and lower connecting portions of the main wall portions 4.

Assembled at the end of the RC segments 6 ...
Although the RC segments 6 are connected to each other and the main wall portions 4 are connected to each other, as shown in FIG. 2, each RC segment 6 at its end (hereinafter referred to as a connecting portion RC segment 6A)
), A joint portion 8 having a substantially U-shaped cross-sectional profile and integrally protruding from the end surface 6a in the longitudinal direction of the connecting portion RC segment 6A is provided.

In the case of the present embodiment, one joint portion 8 is provided at one end of the end face 6a of the connection portion RC segment 6A. When the end surfaces 6a of the connection portion RC segments 6A, 6A to be connected are opposed to each other, the joint portion 8 is staggered. It is located at. The joint portion 8 is formed with a pin penetration hole 8a penetrating in the width direction of the connection portion RC segment 6A.

As shown in FIG. 2, joint portions 9 similar to the joint portions 8 are provided integrally with the middle pillar 5 on both end surfaces 5a, 5a of the middle pillar 5, respectively. That is, the joint portion 9 has a substantially U-shaped cross-sectional profile, protrudes from the center of the end face 5a in the length direction, and further has a pin penetration hole 9a penetrating in the depth direction of the center pillar 5. .

Note that a sheet-like water-stopping material 10 made of a material such as rubber is attached to a peripheral surface of each of the joint portions 8 and 9.

And the connecting part RC segments 6A, 6A to be connected to each other
Are connected to the ends of the main walls 4 and 4 respectively (in this case, the respective joints 8 are alternately opposed to each other), and then the joint 9 of the center pillar 5 is connected to both joints 8, 8 The joints 8 and 9 are alternately overlapped with each other in the longitudinal direction of the drilled hole 2, and then the pins 11 are inserted into the respective pin penetration holes 8 a and 9 a communicating with each other. , Both connecting parts
RC segments 6A, 6A and center pillar 5 are connected to each other. The pin 11 has substantially the same length as the RC segment 6, has a diameter that fits tightly into the pin penetration holes 8a, 9a, and is inserted so as not to protrude from the joint portion 8.

As described above, the end portions of the main wall portions 4 and the middle pillar 5 are connected to each other, and the lining tubular wall body 6 is constructed. As shown in FIG. 3, a large number of the lining tubular wall members 3 are connected in the longitudinal direction of the excavation hole 2 by bolting the joint fittings 7 to each other, so that the primary lining is performed. You.

As shown in FIG. 3, each of the main walls 4, 4 of the lining tubular wall 3 connected in this manner is connected to one end and the other end of both main walls 4, 4. The connecting portions RC segments 6A to be connected to each other are alternately short, so that the RC segments 6 are arranged in a staggered manner along the length direction of the excavation hole 2.

According to the lining tubular wall body 3 having the above-described configuration, the joint portions 8, 8 of the connecting portion RC segment 6A to be connected and the joint portion 9 of the middle pillar 5 are overlapped with each other, and the pins formed therein are penetrated. By penetrating one pin 11 into the holes 8a, 9a, the connecting portion RC segments 6A and the middle pillar 5 can be connected simultaneously.

Accordingly, the connection work between the main wall portions 4 and the connection work of the middle pillar 5 to the connection portion receiving of the main wall portion 4 are simplified, and the work time is greatly reduced. In addition, since only one pin 11 is required for the connecting portion, the cost can be reduced as compared with the conventional one that uses many bolts and nuts.

Subsequently, another embodiment of the present invention will be described with reference to FIG. 4 to FIG.

Reference numeral 20 in FIG. 4 denotes a lining tubular wall body of the present embodiment constructed in the above-described excavation hole 2, and the lining tubular wall body 20 includes:
As in the above embodiment, each excavation hole 2a is C-shaped along its peripheral wall (the right excavation hole 2a in FIG.
The main wall portions 21 and 21 are constructed in the shape of a letter, and a center pillar 22 is installed between two connecting portions of the main wall portions 21 and 21. The arcuate plate-shaped segment 23 and the middle pillar 22 that constitute 21 are made of steel.

As shown in FIG. 5, a steel segment (hereinafter referred to as a steel segment) 23 includes a pair of main girders 24 which are formed in an arc shape and are opposed to each other, and an end plate 25 connecting both ends of the main girders 24. And a skin plate 26 covering the convex side of the box-shaped body formed by the main girder 24 and the end plate 25, and a rib 27 fixed inside.

In the main girder 24 and the end plate 25, bolt insertion holes 24a, 25a are formed at regular intervals, respectively, and the end plates 25 are bolted together using the bolt insertion holes 25a of the end plate 25. The steel segments 23 are connected to each other along the peripheral wall of the excavation hole 2a, thereby forming the main wall portion 4.

As shown in FIGS. 4 and 6, the center pillar 22 is formed into a prismatic shape using a steel plate, and has a depth equal to the width of the steel segment 23. , Are connected to upper and lower connecting portions of the main wall portions 4, 4.

Of the steel segments 23, the steel segments 23 assembled at the ends are connected to each other to form the main wall portion 4.
Although they are connected to each other, as shown in FIG. 6, the end plate 2 on the connection side of each steel segment 23 at the end thereof (hereinafter referred to as a connection portion steel segment 23A).
3a is provided with a joint plate 28 (joint portion) integrally having a substantially U-shaped cross-sectional profile and projecting from the end plate 23a in the longitudinal direction of the connecting portion steel segment 23A.

In the case of the present embodiment, the joint plate 28 has one at one end of the end plate 23a of the connecting portion RC segment 23A, one at a position slightly spaced from the other end, and one at the center therebetween. There are a total of three steel segments 23 connected to each other.
When the end faces 6a of A and 23A face each other, they are located alternately. The joint plate 28 is formed with a pin penetration hole 28a penetrating in the width direction of the connecting portion steel segment 23A.

In addition, each end plate 22a, 22a fixed to both ends of the middle pillar 22
6, a joint plate (joint portion) 29 similar to the joint plate 28 is provided. This joint plate 29 is provided one at the center of the end plate 22a, and on both sides thereof, one at a time at the same interval as the joint plate 28 provided on the end plate 25 of the connecting portion steel segment 23, A total of three are provided. Each joint plate 29 is formed with a pin penetration hole 29a penetrating in the depth direction of the center pillar 5.

And the connecting steel segments to be connected to each other
After the joints 23A, 23A are respectively connected to the ends of the main wall portions 21, 21 (in this case, the joint plates 28 are overlapped at intervals), the joint plate 29 of the center column 22 is The joints 28 and 29 are inserted between the joint plates 28 so that the joints 28 and 29 are alternately overlapped with each other in the longitudinal direction of the excavation hole 2, and then, the pins 30 are respectively inserted into the pin penetration holes 28 a and 29 a connected to each other. Penetrated, the two connecting steel segments 23A, 23A and the middle column 22 are connected to each other.

It is preferable that an elastic body 31 such as rubber is sandwiched between the joint plates 28 and 29, as shown in FIG. 7, so that the joint plates 28 and 29 do not shift in the longitudinal direction of the excavation hole 2. .

As described above, the lining tubular wall body 20 is constructed in a state where the end portions of the main wall portions 21 and the middle pillar 22 are connected to each other. As shown in FIG. 7, the lining tubular wall body 20 is connected to the main girders by bolts using the bolt insertion holes 24a of the main girders 24 of the steel segments 23, so that the excavation holes 2 are formed. Are connected in the length direction and are subjected to primary lining.

In the lining tubular wall body 20 of the present embodiment, as in the previous embodiment, the connection work between the main wall portions 21 and the connection work to the connection portion between the main wall portions of the middle pillar 22 can be performed simultaneously. Therefore, the operation time can be greatly reduced, and the cost can be reduced.

[Effects of the Invention] As described above, according to the tubular wall for lining excavation holes of the present invention, the connecting operation between the main walls and the connecting operation between the connecting portions between the main walls of the middle pillars. Are performed at the same time, the operation time is greatly reduced, and the cost is reduced as compared with the conventional bolt and nut intensive one.

In addition, the pin penetrates into the pin penetration hole at the connecting part where the arc of the main wall becomes a discontinuous inflection part and the bending moment becomes large because of the double-walled cylindrical wall. In this case, the bending moment at the connecting portion can be dispersed.

In addition, the pin penetration hole is formed substantially on the center line in the thickness direction of each main wall portion and the middle column, and when the joint plates are overlapped with each other in the length direction of the excavation hole, each main wall portion and the middle column are formed. Since it is made to communicate with the intersection of the approximate center line in the thickness direction, the bending moment in two directions that may be generated at the connection point between the main wall and the middle pillar due to the double cylindrical wall is reliably ensured. Can be dispersed.

[Brief description of the drawings]

1 to 3 are views showing an embodiment of the present invention. FIG. 1 is a cross-sectional view of a tunnel in which a primary lining is applied by a lining tubular wall, and FIG. FIG. 3 is an exploded perspective view of a connecting portion, FIG. 3 is a partial plan view of a connected lining tubular wall body,
4 to 7 are views showing another embodiment of the present invention. FIG. 4 is a cross-sectional view of a tunnel in which a primary lining is applied by a lining tubular wall, and FIG. Is a perspective view of the back of the steel segment, FIG. 6 is an exploded perspective view of the connecting portion, and FIG. 7 is a partial plan view of the connected tubular wall for lining. 2, 2a: excavation hole, 3, 20: tubular wall for lining, 4, 21: main wall, 5, 22: center pillar, 6: RC segment, 6A: connecting part RC Segment 8, 9 ... Joint, 8a, 9a ... Pin penetration hole, 11, 31 ... Pin, 23 ... Steel segment, 23A ... Connection steel segment, 28, 29 ... Joint plate (Joint part) ), 28a, 29a ... Pin penetration hole, 30 ... Pin.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) E21D 11/04

Claims (1)

(57) [Claims] 1. A plurality of digging holes having a circular cross section are partially overlapped with each other, and a plurality of digging holes having a circular cross section are provided along a peripheral wall of the digging hole for each of the digging holes having a circular cross section. Assembling the arc-shaped segments to construct a C-shaped main wall, connecting the ends of these main walls to each other,
At the connecting portion, a middle pillar is incorporated, and at the connecting portion, a lining tubular wall of a double excavation hole in which the arcs of the main wall portion are discontinuous with each other, A joint having a pin penetrating hole that overlaps in the longitudinal direction of the excavation hole and communicates with each other in the longitudinal direction of the excavation hole at the coupling end of each of the main wall portions and the coupling end portion of the middle pillar with respect to the main wall portion. Each of the joint plates is connected by a pin penetrating into each of the pin penetrating holes, and the pin penetrating holes are substantially on a center line in the thickness direction of each of the main wall portions and the middle pillar. When the joint plates are formed and overlap each other in the length direction of the excavation hole, they are communicated at intersections of substantially center lines in the thickness direction of each of the main wall portions and the middle pillar. Tubular wall for lining of excavation holes.