JP2683642B2 - Tubular wall for digging hole lining - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tubular wall for lining, which is assembled for lining a double excavation hole.

[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 been used. This method uses a shielded excavator with a structure in which two cylindrical shielded excavators are connected, and excavates the ground or ground into a cross-sectional shape that is continuous with two circles partially overlapping. An RC segment is assembled on the inner surface of the excavated hole to form a cylindrical wall, and a plurality of the cylindrical walls are connected along the hole (primary lining). That is, after filling the filling material that fills the gap between the segment and the ground, the concrete is wrapped around the inner surface of the primary lining (secondary lining), and the ground is supported by them and a predetermined inner space is formed. It is to configure.

Conventionally, as a tubular wall body for lining constructed in the above process, for example, one shown in FIG. 8 is known. FIG. 8 shows an example of a conventional tubular wall for lining. The lining tubular wall body 10 is used for an excavation hole in which left and right circles are continuous, and more specifically, an arc plate-shaped segment 11
To form main wall portions 12 and 12 having a C-shaped cross section and an inverted C-shaped cross section, and connecting branch segment segments 13 and 13 between the upper end portions and the lower end portions of these main wall portions to position them vertically. The intermediate pillar 14 is built between the branching segment segments 13 and 13, and the eyeglass frame-shaped wall bodies thus constructed are sequentially connected in the axial direction of the excavation hole.

The segment 11, the branching segments 13, 13 and the center pillar 14 which form the tubular wall body are connected by bolts and nuts, and the bolt insertion holes 15a of the members are connected by bolts and nuts. Formed fittings 15,15 ...
・ Is buried.

The branch portion segments 13, 13 connecting the upper end portions and the lower end portions of the left and right main wall portions 12, 12 are made of concrete and integrally formed into a Y-shaped appearance. The configuration is in the branch segment 13,
A base 13c having a rectangular cross section whose end face is connected to the center pillar 14,
Branching from this base 13c, the respective end faces are
It has a basic structure composed of connecting arm portions 13a and 13b connected to.

[Problems to be Solved by the Invention] In such a conventional lining tubular wall body 10 for the lining, a cross section C in which the center pillar 14 is erected between the branch segment 13 is provided.
The structure is such that it supports the main wall portions 12 having a letter-like shape and an inverted C-shape in cross section, and it is inevitable that the center pillar 14 has high strength and rigidity. The cost is high because the size of the segment 11 is larger than that of the segment 11 and the number of the inner pillars 14 used is large.

And in its construction, the branch segment 13,13
It requires a process to build the middle pillar 14 between
Since 14 is larger than the segment 11 that constitutes the lining tubular wall body 10, there is a problem that the assembling work is troublesome.

Further, these middle pillars 14 are set up at the boundary between the excavation hole H ₁ and the excavation hole H ₂ in the axial direction of the excavation holes excavation holes H ₁ and H _{2 one} after another at a constant interval. Since the pillar 14 is large and the number of the pillars 14 used is large, the gap between the excavation hole H ₁ and the excavation hole H ₂ opened by this constant interval is narrowed, and the columnar tubular shape is used. In the process of constructing the wall body 10, the ventilation efficiency in the drill holes H ₁ and H ₂ is poor, and the drill hole H 1
There is a problem that it is difficult for workers to come and go between ₁ and the excavation hole H ₂ and it is difficult to transfer equipment and the like.

The present invention has been made in view of the above circumstances, it is easy to perform on-site, it is possible to improve the work efficiency,
The cost is low, the efficiency of ventilation in the drill holes H ₁ and H ₂ is good, and moreover, it is easy to transfer workers between the drill holes H ₁ and H ₂ and to transfer equipment and the like. An object of the present invention is to provide a tubular wall for lining an excavated hole that can be formed.

"Means for Solving the Problem" The tubular wall for lining of a lining of the present invention is a tubular wall for lining an excavation hole, in which two excavation holes each having a circular cross section are formed so as to partially overlap each other. The lining tubular wall body is formed between a main wall portion having a C-shaped cross section and a main wall portion having an inverted C-shaped cross section, and the upper end portions of the main wall portions. And an upper branch portion segment and a lower branch portion segment, which join between the lower end portion and the lower end portion, respectively, are sequentially connected in the axial direction of the drilling hole, and the upper branch portion segment and the lower branch portion segment are formed by a truss-shaped center column The object was achieved by the fact that they are connected.

"Function" In the tubular wall for lining having such a structure, the upper branch segment and the lower branch segment are connected by the truss-shaped center column, so that the structure has neutral strength. Also, the rigidity is improved, and the number of used middle pillars can be reduced. It is also possible to make the center pillar thinner. Therefore, the work of assembling the middle pillar to the upper branch portion segment and the lower portion coming segment can be facilitated, the working efficiency can be improved, and the cost can be reduced. Furthermore, since the gap between the left and right excavation holes is wide, the efficiency of ventilation in the left and right excavation holes is good, and moreover, it is possible to transfer the entire operation to and from the left and right excavation holes and to transfer equipment and the like.

Example 1 Hereinafter, a tubular wall body for lining of the present invention will be described in detail with reference to the drawings.

1 to 3 show the first embodiment of the tubular wall for lining of the invention.
This is to show an embodiment, and the same components as those shown in FIG. 8 are given the same reference numerals in these drawings to simplify the description.

FIG. 1 is a sectional view of a tubular wall body 20 for lining of the present invention,
FIG. 2 is a view showing a main part of FIG. 1, and a third vortex is a plan view seen from the direction of arrow ← in FIG.

In FIG. 1, a lining tubular wall body 20 is a main wall portion having a C-shaped cross section and an inverted C-shaped cross section formed by connecting arcuate plate-shaped segments 11.
12 and 12 (not shown) are constructed and upper branch segment 13A is provided between the upper ends and the lower ends of these main walls, respectively.
The upper branch segment 13A and the lower branch segment 13B of the double circular wall formed by joining the two lower circles and the lower branch segment 13B so that the two circles thus constructed overlap each other. The inner pillar 14 is assembled in a truss shape and sequentially connected in the axial direction of the drill holes H ₁ and H ₂ .

Then, in the same manner as shown in FIG.
Are formed by arcuate plate-shaped segments 11, 11 ... Bolt-bonded in the axial and circumferential directions of the drilled holes H ₁ , H ₂ .
In the arcuate plate-shaped segment 11, joint fittings 15, 15,.
・ ・ Is buried. Further, the upper branch segments 13A, 13A ... And the lower branch segments 13B, 13B
... Also drill holes H ₁ and H ₂ by bolts and nuts
Are sequentially connected in the axial direction.

As shown in FIG. 1, the upper branch segment 13A, 13
In A ..., every other joint material 22 having a bolt insertion hole is provided. Further, in the lower branch segment 13B, 13B ..., the joint material 22 in which the bolt insertion hole is formed is provided in the upper branch segment 13A, 13A ... And the drill material H ₁ , H. Every other one is provided so as to be arranged in a zigzag pattern in the axial direction of ₂ .

Bolt insertion holes are formed at both ends of the center pillar 14, respectively. As shown in FIG. 2 and FIG. 3, the bolt insertion holes formed at both ends of the center pillars 14, 14 and the bolt insertion holes formed in the joint material 22 are overlapped with each other, and these are overlapped. A bolt 31 having a threaded portion 30 is inserted through the insertion hole and fixed with a nut 32. As a result, the center pillars 14 and 14 become
... and lower branch segments 13B, 13B ... Are assembled in a truss shape.

Embodiment 2 FIG. 4 is a view showing a second embodiment of the present invention.

In FIG. 4, the tubular wall 40 for lining is the first of the present invention.
Similar to the embodiment, arcuate segment 11 is connected to construct main wall portions 12 and 12 (not shown) having a C-shaped cross section and an inverted C-shaped cross section, and the upper end portions of these main wall portions are formed. 2 thus constructed by joining the upper branch segment 13A and the lower branch segment 13B between the lower and upper ends, respectively.
The middle pillar 14 is assembled in a truss shape to the upper branch segment 13A and the lower branch segment 13B of the double circular wall formed so that two circles partially overlap each other, and the excavation holes H ₁ , H ₂ Are sequentially connected in the axial direction.

Then, in the same manner as shown in FIG.
Are formed by arcuate plate-shaped segments 11, 11 ... Bolt-bonded in the axial and circumferential directions of the drilled holes H ₁ , H ₂ .
In the arcuate plate-shaped segment 11, joint fittings 15, 15,.
・ ・ Is buried. Further, the upper branch segments 13A, 13A ... And the lower branch segments 13B, 13B
... Also drill holes H ₁ and H ₂ by bolts and nuts
Are sequentially connected in the axial direction.

As shown in FIG. 4, the upper branch segment 13A, 13
A ... is provided with joint members 22 each having a bolt insertion hole. Further lower branch segment
Also in 13B, 13B ..., Joint materials 22 each having a bolt insertion hole are provided. Bolt insertion holes are formed at both ends of the center pillar. As shown in FIG. 2 and FIG. 3, the bolt insertion holes formed at both ends of the middle pillars 14 and 14 are overlapped with the bolt insertion holes formed in the joint material 22, and these are overlapped. A bolt 31 having a threaded portion 30 is inserted through the insertion hole and fixed with a nut 32. As a result, the central pillar 14,14 ...
Are assembled to the upper branch segment 13A, 13A ... And the lower branch segment 13B, 13B in a double truss shape.

In this way, the truss-shaped center pillars 14, 14 ... Are double-assembled with the upper branch portion segments 13A, 13A. It can be attached to the pillars 14,14 ...

"Embodiment 3" FIGS. 5 to 6 are views showing a third embodiment of the present invention.

In the lining tubular wall body 50 shown in FIG. 5, channel steel 51 is welded to each of the upper branch portion segment 13A and the lower branch portion segment 13B, as shown in FIG.

Bolt insertion holes 52a and 52b are formed in the channel steel 51 as shown in FIG.

Further, bolt insertion holes are formed at both ends of the center pillar 14, respectively.

Then, as shown in FIG. 7, the bolt insertion holes formed at both ends of the center pillar 14, 14 and the bolt insertion holes 52a, 52b formed in the channel steel 51 are overlapped with each other, and By inserting a bolt 31 (not shown) into the overlapping insertion holes and fixing it with a nut 32 (not shown),
Middle pillars 14,14 ... are upper branch segment 13A, 13A ...
.. and the lower branch portion segments 13B, 13B ... Are assembled in truss form via the channel steel 51.

As described above, the work of assembling the intermediate columns 14, 14, ... Is facilitated by interposing the grooved steel 51 having the bolt insertion holes 52a, 52b formed therein.

[Advantages of the Invention] As described above, the tubular wall for lining of the present invention has a tubular tubular body for lining an excavation hole in which two excavation holes each having a circular cross section are formed so as to partially overlap each other. The wall-first tubular wall body for lining includes a main wall portion having a C-shaped cross section and a main wall portion having an inverted C-shaped cross section, the main wall portion having a plurality of arc-shaped plate segments
An upper branch segment and a lower branch segment, which join the upper end portions and the lower end portions of the main wall portions, respectively, are sequentially connected in the axial direction of the drill hole, and the upper branch segment and the lower branch segment are further connected. Due to the feature that the segments are connected by the truss-shaped center pillar, the construction at the site is easy, the work efficiency can be improved, the cost is low, and the drill hole
The ventilation in H ₁ and H ₂ is efficient, and the drilling hole H ₁ and drilling hole H
It is possible to easily send and receive workers to and from the ₂ and to transfer equipment and the like.

[Brief description of the drawings]

FIG. 1 is a sectional view of a tubular wall for lining of a first embodiment of the present invention, FIG. 2 is a view showing a main part of FIG. 1, and FIG.
FIG. 4 is a plan view seen from the direction of arrow ← in the figure, FIG. 4 is a cross-sectional view of the tubular wall body for lining of the second embodiment of the present invention, and FIG. 5 is a covering of the third embodiment of the present invention. Fig. 6 is a sectional view of the tubular wall for engineering work, Fig. 6 is a view showing a joining state between the channel steel of Fig. 5 and the upper (lower) branching segment, and Fig. 7 is the channel steel of Fig. 6 and the middle. FIG. 8 is a view for explaining an assembled state with a pillar, and FIG. 8 is a side view of a conventional lining tubular wall body. 11 …… Arc plate segment, 12 …… Main wall, 13A …… Upper branch segment, 13B …… Lower branch segment, 1
4 …… Middle pillar, 20,40,50 …… Cylinder wall for lining, H ₁ , H ₂ … Drilling holes.

Claims (1)

(57) [Claims] 1. A cylindrical wall body for lining an excavation hole, wherein two excavation holes each having a circular cross section are formed so as to partially overlap each other, and the cylindrical wall body for lining is a plurality of arcs. A main wall part having a C-shaped cross section and a main wall part having an inverted C-shaped cross section composed of plate-shaped segments, and an upper branch part and a lower branch part for joining upper end parts and lower end parts of these main wall parts, respectively. Segments are sequentially connected in the axial direction of the excavation hole, and further, the upper branch portion segment and the lower branch portion segment are connected by a truss-shaped center pillar, which is a cylinder for lining the excavation hole. Wall.