JPH035599A - Cylindrical wall for covering boring hole - Google Patents

Abstract

PURPOSE:To make the construction easy by connecting a cross sectional C- shaped main wall part to a cross sectional reverse C-shaped main wall with a pair of segments, and connecting the inner middle parts of the integrated body with a branch support member. CONSTITUTION:Main bodies 12, 12 in C and reverse C shape in cross section formed of arc plate segments 11 are connected with a connection segments 21, 21 between which connection is made by a branch support 14. A first coupling means at the segment and a second coupling means at both sides of the branch support are coupled with pin 25 to couple the segments 21 with the body 14. The work efficiency is improved with each construction accordingly.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a lining cylindrical wall body assembled for lining a double excavation hole.

"Prior Art" In recent years, a method called a rectangular special cross-section shield method has been used as a large-section shield method for constructing large-section tunnel structures such as railway tunnels. This construction method uses a shield excavator, which has a structure in which two cylindrical shield excavators are connected, to excavate other mountains or the ground in a cross-sectional shape of two circles, with some of them overlapping. , RC segments are assembled on the inner surface of this excavated hole to form a cylindrical wall, and a plurality of these cylindrical walls are connected along the hole (primary lining), and the back side of the segment of this secondary lining. In other words, after filling the gap between the segment and another pile with the injection material, concrete is rolled on the inner surface of the secondary lining (secondary lining), supporting the earth and filling the predetermined inner cavity. It is said that it constitutes.

Conventionally, as a cylindrical wall constructed by the above-described process, for example, the one shown in FIG. 9 is known. FIG. 9 shows an example of a conventional cylindrical wall. This cylindrical wall lO is
It is used for excavation holes in which circles are connected from side to side. Specifically, arc-shaped segments 11 are connected to form a cross section C.
Main walls 12, 12 having an inverted C-shape in cross section are constructed, and branch segments 13 and 13 are connected between the upper and lower ends of these main walls to form branch segments l located above and below.
A branch support body 14 is built between 3 and 13, and the eyeglass frame-shaped wall bodies thus constructed are successively connected in the axial direction of the excavated hole.

The segments 11, the branch segments 13, 13, and the branch support 14, which constitute the cylindrical wall, are connected by bolts and nuts, and each member has a bolt insertion hole as a connection part by the bolts and nuts. Joint fittings 15, 15, . . . 15a formed therein are buried.

The branch segment 13 that connects the upper and lower parts of the left and right main walls 12, 12 is made of concrete and is integrally molded into a Y-shape in appearance. , a base 13c with a rectangular cross section whose end face is connected to the branch support I4, and a base 13c whose end face is branched from this base 13c and whose end face is the main wall part 12,1.
The basic structure consists of connecting arms 13a and 13b that are connected to the arm 2'.

In addition, in the above example, the case where the double drilled holes H7 and Hl are arranged horizontally is explained, but the same applies to the case where these are arranged vertically, and the drilled holes H3 and Ht are arranged horizontally. When arranged vertically, the branch support 14 functions as a middle pillar or wall, and when arranged vertically, it functions as a floor slab.

"Problem to be Solved by the Invention" In the construction of such a conventional cylindrical wall body 10, a step of building the branch part support body 14 between the branch part segments 13, 13 is required. However, this branch support 14 is a segment that constitutes the cylindrical wall 10! Since it is larger than (2), there is a problem in that it takes time and effort to assemble it.

Further, branch segments 13, 13 having a Y-shaped appearance are interposed between the segments 11 forming the main wall portion 12.12, and a branch support body 14 is positioned between these branch segment segments 13.13. Top, bifurcation segment 13.1
3 position accuracy is required, and the branch segment 13
．． 13, the segments 11,
11. Due to the structure in which the branch support 14 is connected to the base 13c, the branch segment 13.13 itself must have good dimensional accuracy, which increases the cost.

The present invention has been made in view of the above circumstances, and is a cylindrical wall body for lining an excavated hole that can be easily constructed on site, improves work efficiency, and reduces construction costs. The purpose is to provide

"Means for Solving the Problems" The cylindrical wall body for lining of the present invention is a cylindrical wall body for lining an excavated hole in which two excavated holes each having a circular cross section are formed so that a portion of the holes overlap each other. This tubular wall for lining includes a main wall portion having a C-shaped cross section, a main wall portion having an inverted C-shaped cross section, and a joint segment that joins these main wall portions. and a branch support for connecting these joint segments, each of the joint segments is provided with a first joint material, and further, each of the two ends of the branch support is provided with a second joint material. The above object has been achieved by providing a joint segment and a branch support, wherein the joint segment and the branch support are pin-coupled via the first and second joint members.

"Function" In the tubular wall for lining with this structure, the branch part support and the joint part segment are joined by a simple pin connection, so there is no need to provide a branch part segment, and construction is easy. It is. Furthermore, since the work efficiency can be improved, construction costs can be reduced.

"Embodiment 1" FIGS. 1 to 3 are diagrams showing a first embodiment of the present invention. Although concrete segments and steel segments are provided as the segments, the steel segments will be explained here as an example. Note that parts having the same configuration as in FIG. 9 shown in the prior art are designated by the same reference numerals, and the explanation thereof will be omitted.

FIG. 1 is a side view of a lining cylindrical wall body 20 of the present invention.

This lining cylindrical wall body 20 has main wall parts 12, 12 having a C-shaped cross section and an inverted C-shaped cross section by connecting arc-shaped segments 11.
Build these main wall joint segments 21.21
A branch support 14 is connected between the two, and the walls of the spectacle frame thus constructed are successively connected in the axial direction of the excavated hole HISHz.

The main wall portions 12, 12 are arc-shaped segments II, 1.
1... and joint segments 21, 21... are formed by being bolted together in the axial and circumferential directions of the drilled holes H+ and Ht. The arc-shaped segment 11 has a bolt insertion hole 15a as a bolt/nut connection.
The joint fittings 15, 15, . . . formed therein are buried therein.

2 and 3 show the joint segments 21.21 of the main wall 12.12 and these joint segments 21.21.
FIG. 2 is a side view of the main part of FIG. 1, and FIG. 3 is a perspective view of the main part for explaining the assembled state of FIG. 2.

In FIGS. 2 and 3, the joint segment 21 is composed of a skin plate 22, main girders 23, 23, and a middle girder 24, and at both ends of this joint segment 21 there are Joint plate 21a for joining with segment 11.11.

21a is provided, and ribs 24a, 24a are further provided with the middle girder 24 in between.

A first joint 26.26 is welded to the middle girder 24. The first joint 26.26 is made up of two brackets each having an insertion hole 26a for inserting a pin 25 such as a bolt.

Further, at both ends of the branch support body 14 made of H-beam steel, there are two
A second joint dowel 27.27 consisting of two brackets is welded to it, and an insertion hole 27a for inserting the pin 25 is also formed in this second joint dowel 27.

Then, the insertion holes 26a and 27a formed in each of the first joint punch 26 and the second joint punch 27 are overlapped, and the pin 25 is inserted into the insertion holes, and a nut 28 is attached to the pin 25. By screwing together the threaded portion 29, the joint segment 21 and the branch support 14 are pin-coupled.

"Example 2" FIG. 4 is a diagram showing a second embodiment of the present invention.

In FIG. 4, the lining cylindrical wall 30 is the branch support 1
The lining cylindrical wall body 20 of Example 1 except that the structure of No. 4 is different.
It has the same structure as .

The branch support 14 of the lining cylindrical wall 30 consists of divided parts 14a and 14b cut into two with tapered cut surfaces near the center, and a flat plate 31 is attached to each end. .31 is provided, and the bolt/
It is connected by a nut. Said flat plate 31.31
A bolt insertion hole (not shown) is formed in each of the holes.

The advantage of using the branch support 14 having such a structure is that the divided parts 14a and 14b can be temporarily fixed to the joint segments 21 and 21 in advance, and the main wall having a C-shaped cross section and an inverted C-shaped cross section can be attached. After assembling the parts 12, 12, the divided parts 14a, 14b are moved in the direction of the arrow in the figure and are joined with bolts and nuts at the cut part 31 to form the branch part support 14. By doing so, the construction of assembling the branch part support body 14 to the main walls 12, 12 becomes much easier than when assembling it without dividing it.

"Embodiment 3" FIGS. 5 to 8 are diagrams showing a third embodiment of the present invention. In FIG.
This is an example of a case where Ht is arranged vertically.

FIG. 5 shows the joint segment 21 and the branch support 14.
FIG. The joint segment 21 consists of a skin plate 22 and a main girder 23.23.
Main joints 41a, 41a each having an insertion hole for inserting the pin 25 are welded to the skin plate 22.
There are also secondary joints 41b and 41 with insertion holes formed therein.
b are welded so that each pair of joints 41a and 41a are parallel to each other. And these main and sub-joints 41
A, 4lb, 41a, and 4lb, the pin 25 is inserted into the insertion hole formed in it, and is fixed with the nut 28. Further, as shown in FIG. 6, a branch support 14c is provided with a U-shaped joint member (second joint member) 51.51.
(FIG. 6), a U-shaped joint member (second joint member) 51.51 is connected to the pin 25.25 fixed between the joint members 41a and 42b, and the joint segment 21.
21 are connected by a branch support 14c.

In addition, what is indicated by the symbol 14d in FIG. 6 is 14c.
This is a modified example.

FIG. 7 shows a modification of the third embodiment. 7(a) and 7(b) respectively show the positional relationship between the main girder 23 of the joint segment 21, the joint dowel 41a, and the insertion hole 25a of the pin 25 formed in the joint dowel 41a. , Fig. 7(a) shows the pin insertion hole 2.
5a is provided on the outside of the main spar 23, and FIG. 7(b) shows a case where the pin insertion hole 25a is provided on the inside of the main spar 23.

7(c) is a plan view of FIG. 7(a), and FIG. 7(d) is a plan view of FIG. 7(b).

In FIG. 7(c), the skin plate 22 of the joint segment 21 is provided with a support 61.
1, a pair of joints 41a and 41b in which an insertion hole 25a for the pin 25 shown in FIG. 5 is formed are welded in parallel,
Pins 25 are inserted through these insertion holes and fixed with nuts 28. A U-shaped joint 51 of the branch support 14c is coupled to this pin 25.

In FIG. 7(d), the length of the support body 61 is shortened in the above-mentioned FIG. 7(c).

All of the above examples are for steel segments, but
The material for the lining cylindrical wall of the present invention is not limited to these, and may be made of concrete, for example.

FIG. 8 shows the main parts of the joint segment 21 and the branch support 14 in a third embodiment of the present invention in which concrete segments are used.

In this case, a pair of joints 71 and 71 each having an insertion hole for a pin 25 are buried in a concrete joint segment 21 in parallel, and the pin 25 is inserted into these insertion holes.
A U-shaped joint member 51 is fixed to the nut 28.
．． By connecting the U-shaped joint member 51.51 to the pin 25, the joint segment 21.21 is connected by the branch support 14 made of concrete in which the joint segment 51 is embedded. It is.

"Effects of the Invention" As explained above, the cylindrical wall body for lining of the present invention has a main wall part having a C-shaped cross section and a main wall part having an inverted C-shaped cross section, each of which is composed of a plurality of arc plate-like segments. It consists of a joint segment that joins these main walls, and a branch support that connects these joint segments, each of the joint segments being provided with a first joint, and further provided with a first joint part of the branch support. The branch part is characterized in that a second joint part is provided at each end, and the joint part segment and the branch part support are pin-coupled via the first and second joint parts. There is no need to provide segments, construction is easy, and work efficiency can be improved, so construction costs can be reduced.

[Brief explanation of the drawing]

Fig. 1 is a side view of a tubular wall for lining according to the first embodiment of the present invention, Fig. 2 is a side view of the main part of Fig. 1, and Fig. 3 shows the assembled state of Fig. 2. FIG. 4 is a perspective view of essential parts, and FIG. 4 is a side view of a tubular wall for lining according to the second embodiment of the present invention, and FIGS.
The drawings are diagrams for explaining the third embodiment of the present invention, in which Fig. 5 is a perspective view of a main part of a lining cylindrical wall body, Fig. 6 is a perspective view showing an example of a branch part support body, Figure 7 is (a), (b) is a schematic side view of the main part of the lining cylindrical wall, Figure 7 (c),
(d) is a schematic configuration diagram corresponding to FIGS. 7(a) and (b), respectively, and FIG. 8 is a perspective view of the main parts of the joint segment and branch support when concrete segments are used. FIG. 9 is a side view of a conventional cylindrical wall for lining. DESCRIPTION OF SYMBOLS 11... Arc plate-shaped segment, 12... Main wall part, 14... Branch part support body, 20.30... Cylindrical wall body for lining, 21... Joint part segment, 25. ...Pin, 26...First joint material, 27...Second joint material, H+, Ht...Drilled hole.

Claims (1)

[Claims] A cylindrical wall for lining an excavated hole formed in such a way that two excavated holes each having a circular cross section partially overlap each other, the cylindrical wall for lining a plurality of A main wall portion having a C-shaped cross section and a main wall portion having an inverted C-shaped cross section, each of which is constituted by arc plate-like segments, a joint segment that joins these main wall portions, and a branch support body that connects these joint segments. each of the joint segments is provided with a first joint material, and each of the ends of the branch support is provided with a second joint material, and the joint segment and the branch support are each provided with a first joint material. A cylindrical wall body for lining an excavated hole, characterized in that the wall body is pin-coupled via first and second joint members.