JPH04194295A - Method for building underground structure with movable timbering - Google Patents

Abstract

PURPOSE:To stabilize support and to shorten a work executing time by erecting first - third moving timbering each, formed in a state that a support beam is elevated, in a pipe roof, and excavating a bedrock simultaneously with building of an underground structure. CONSTITUTION:First moving timbering 20A formed such that a support beam 33 is elevatable by means of a jack 30 is erected on the frontmost part of a part where a bedrock 1 inside a pipe roof 2 is excavated. Second moving timbering 20B is erected in the vicinity of the first moving timbering, and a third moving timbering 20C is erected with a distance therebetween to support the pipe roof 2. Simultaneously with excavation of the bedrock 1 in front of the moving timbering 20A, an underground structure 10 is built in the rear of the third moving timbering 20C. Through movement of each of the moving timbering 20A-20C, the pipe roof 2 is supported and excavation and building are repeated. This method carries out safe and easy execution of a work.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method of constructing underground structures such as tunnels by using a pipe roof to prevent deformation of the ground.

[Conventional technology]

To construct an underground structure such as a tunnel, a large number of steel pipes are inserted into the ground along the outer periphery of the part to be excavated for construction. There is a method of constructing an underground structure by forming a pipe roof that matches the external shape of the underground structure, and then excavating the ground inside the pipe roof.

The method involves excavating the ground inside the pipe roof while supporting the pipe roof with shoring. By repeating this process, the part of the pipe roof that has been excavated will be
Build underground structures.

Then, an underground structure is built in that part of the shoring that supported the pipe roof, or a part of the shoring is buried in the underground structure while the shoring is removed.

In addition, underground structures can be constructed through the above-mentioned excavation, shoring erection, and embankment construction.
Furthermore, construction is being carried out by constructing and removing the shoring.

[Problem to be solved by the invention]

Among the conventional methods for constructing underground structures using pipe roofs, the erection of underground supports is a difficult task, and the method of removing the supports involves removing the supports while trying to speed up construction. If underground structures are constructed, removal work becomes difficult.

Furthermore, in the method of embedding shoring in an underground structure, there is a relationship between the reinforcing bars buried in the underground structure and the shoring, resulting in a complicated structure and high cost.

Furthermore, even if carried out as described above, since the underground structure is constructed after excavating the ground, the construction takes a long time. The technical challenge is to make the construction of an underground structure using a pipe roof simple, safe, and shorten the construction time.

[Means to solve the problem]

The present invention involves inserting a pipe 3 along the outer periphery of a ground 1 to be excavated, forming a pipe roof 2 that matches the external shape of an underground structure 10 to be constructed, and supporting this pipe roof 2 with shoring. In the method for constructing an underground structure 10 in which the ground 1 inside the pipe roof 2 is excavated, the ground 1 inside the pipe roof 2 is formed of a frame at the forefront of the excavated part, and a receiving plate is formed. A first movable support 20A with a girder 33 that can be raised and lowered by a jack 30 is erected, and a second movable support 20B with a similar configuration is erected close to the first movable support 20A. , a third movable support 20C having a similar configuration is erected at a distance from the second movable support 20B, and obstructs the pipe roof 2, so that the structure is placed in front of the first movable support 20A. Then, the ground 1 is excavated, and the underground structure 10 is constructed behind the third movable support 20C. Next, the first movable support 20A is
The earth 1 is moved to the front of the excavated part to support the pipe roof 2, and then the second movable support 20B is moved to the front of the excavated part.
moving the third movable shoring 20C to a position close to the movable shoring 20A to support the pipe roof 2, and moving the third movable shoring 20C to a position spaced apart from the second movable shoring 20B, An underground structure using movable shoring that supports the pipe roof 2, excavates the ground 1 in front of the first movable shoring 20A, and constructs the underground structure 10 behind the third movable shoring 20C. As a construction method.

[For use]

In the present invention, while excavating the ground 1 in front of the first movable support 20A, at the same time behind the third movable support 20C,
Underground structures are constructed, reducing construction time.

Furthermore, the movable support 20 is moved forward in sequence, so it can be moved safely in a short time.

〔Example〕

1 to 6 are diagrams for explaining a method of constructing an underground structure using a movable support according to an embodiment of the present invention.

In this embodiment, a large number of steel pipes 3 are inserted from the side wall of a shaft (not shown) in a rectangular shape along the outer periphery of a portion of the earth to be excavated.

Then, a pipe roof 2 is formed by a large number of inserted pipes 3. Then, the pipe 3 is placed so that the end of the pipe 3 protrudes from the side wall of the shaft, or the ground 1 inside the inserted end of the pipe 3 is slightly excavated.

Take care of the following: the area of the pipe 3, that is, the pipe roof 2
A first movable support 20A1 and a second movable support 20B are inserted and erected close to each other inside the end of the pipe roof 2 to support the pipe roof 2.

The first movable support 20A, the second movable support 20B, and the third movable support 20C to be described later are:
As shown in FIG. 5, an upper connecting member 22 and a lower connecting member 23 are connected to form a rectangular frame 21.

A first reinforcing member 25 is attached to the corner of the frame 21, and a support girder 33 is provided on the upper part of the upper connecting member 22 of the frame 21 via two jacks 30.

Each movable support 2 erected inside the vibe roof 2
The second reinforcing member 26 is provided between the two and the second reinforcing member 26 is provided so as to maintain a parallel state.

As described above, the first movable support 20A and the second movable support 20B are inserted into the end of the pipe roof 2, and the ground inside the end of the pipe roof 2, which is supported by extending the jack 30, is inserted into the end of the pipe roof 2. Mountain 1 is excavated at predetermined intervals.

Next, the jacks 30 of the first movable shoring 20A are reduced, the first movable shoring 20A is moved forward by a predetermined distance, the jacks 30 are extended, and the pipe roof 2 is supported. Then, the second movable shoring 20B is similarly moved to a position close to the first movable shoring 20A to support the pipe roof 2.

Next, move the third movable support 20C to the end of the pipe roof 2.
is inserted and erected to support the vibration roof 2, and the other mountain 1 in front of the first movable support 20A is excavated.

Then, in the same manner as described above, the first movable shoring 20A is moved forward by a predetermined distance to support the vibe roof 2, and then in the same manner, the second movable shoring ZOB is moved forward by a predetermined distance. Move it to a position close to the movable support 20A,
The pipe roof 2 is supported, and then the third movable support 2
0C is moved to a position spaced apart from the second movable support 20B to support the pipe roof 2.

In the manner described above, preparations for constructing the underground structure 10 are completed. The above-mentioned ready state is the state in which the reinforcing bars 11 are removed from FIG.

The underground structure 10 is constructed as follows.

That is, in front of the first movable support 20A shown in FIG. 1, the ground l inside the pipe roof 2 is excavated as shown in FIG. Behind the movable support 20C, the reinforcing bars 11 are placed inside the vibe roof 2, and the template 12 is placed as shown in Fig. 2.
An underground structure 10 is constructed as shown in the figure.

Next & Mi The jack 30 of the first movable support 20A is reduced and the ground 1 in the vibe roof 2 is
is moved to the front of the excavated part, the jack 30 is extended, and the pipe roof 2 is supported by the first movable support 20A.

Next As shown in Figure 4, - the second movable support ZOB
is similarly moved to a position close to the first movable shoring 20A to support the pipe roof 2, and
The third movable support 20C is replaced by the second movable support 20C.
Similarly, it is moved to a position spaced apart from B to support the pipe roof 2.

Then, after moving the second movable shoring 20B and the third movable shoring 20C +1 to support the pipe roof 2, the third movable shoring 20C is moved. In addition to the method of moving, depending on the state of the ground 1, the second movable support 20B and the third movable support 20
It is also possible to move C at the same time.

Furthermore, after moving the third movable support 20C first and supporting the pipe roof 2, the second movable support 20C is moved.
There is also a method of moving 0B.

In the state shown in FIG. 4, the first movable support 2
When the ground 1 in front of 0A is excavated, an underground structure 10 is constructed behind the third movable support 20C, and the above construction is repeated.

〔Effect of the invention〕

This invention is inside the pipe roof 2! The first movable support 20A and the second movable support 20 are formed into a frame shape and have a receiving girder 33 raised and lowered by a jack 30.
B, and the third movable support 20C is erected to support the pipe roof 2. Excavation of the other mountain l inside the pipe roof 2 is as follows:
Performed in front of the first movable support 20A, underground structure 10
The construction is carried out behind the third movable support 20C.

Therefore, the excavation and construction of the underground structure 10 can be performed at the same time, and the construction time can be shortened.

Furthermore, among the movable supports zO, at least one movable support 20 always supports the pipe roof 2, and the other movable supports 20 are sequentially moved forward.

Therefore, the pipe roof 2 can be supported stably, and the shoring can be installed and removed very easily.

[Brief explanation of the drawing]

Figures 1 to 6 are explanatory diagrams of a method for constructing an underground structure using a movable support according to an embodiment of the present invention. Figure 5 shows the construction state. Figure 5 is a front view of the movable support. Figure 6 is a sectional view of the pipe roof and underground structure. 1. Earth, 2. Pipe roof, 3. Pipe, 10.
Underground structure, 2o, movable shoring, 20A...first movable shoring, 20B, second movable shoring, 20C, third movable shoring, 30, jack, 33 support girder.

Claims (1)

[Claims] (1) Insert the pipe 3 along the outer circumference of the ground 1 to be excavated to form a pipe roof 2 that matches the external shape of the underground structure 10 to be constructed, and support this pipe roof 2 with shoring. In the method for constructing an underground structure 10 in which the ground 1 inside the pipe roof 2 is excavated, the ground 1 inside the pipe roof 2 is formed into a frame shape at the forefront of the excavated part, and a receiving girder is A first movable shoring structure 20A, in which the movable supporting structure 33 can be raised and lowered by a jack 30, is erected, and a second movable shoring structure 20B, which has a similar structure, is erected close to this first movable shoring structure 20A. , a third movable shoring 20C having a similar configuration is erected at a distance from the second movable shoring 20B to support the pipe roof 2, and is placed in front of the first movable shoring 20A. Then, while excavating the ground 1, the underground structure 10 is constructed behind the third movable shoring 20C, and then the first movable shoring 20A is
The earth 1 is moved to the front of the excavated part to support the pipe roof 2, and then the second movable support 20B is moved to a position close to the first movable support 20A. While supporting the pipe roof 2, the third movable shoring 20C is moved to a position spaced apart from the second movable shoring 20B to support the pipe roof 2, and the first
While excavating the ground 1 in front of the movable support 20A,
A method for constructing an underground structure using a movable support, in which the underground structure 10 is constructed behind the third movable support 20C.