JPH1136788A - Tunnel excavation method with continuous supply support - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a tunnel excavation method with good workability and inexpensive continuous supply by a simple method. SOLUTION: This is a method for digging a tunnel and installing a shoring behind the digging, in which a shoring material is stored inside the tunnel digging machine, and the shoring material is continuously formed as the tunnel digging machine excavates. It is a tunnel excavation method with continuous supply support characterized by being supplied behind the excavation,
Further, the support material is stored in a support material storage box in a roll shape or a folded shape, and is continuously supplied from a supply port provided in an upper half cross section of the tunnel excavator. A tunnel excavation method using continuous support, wherein the continuously supplied support material is divided and supplied to the top of the tunnel and both side walls of the tunnel. It is a construction method.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for installing a tunnel support.

[0002]

2. Description of the Related Art Tunnel excavators include a tunnel boring machine (hereinafter referred to as TBM), a shield excavator, and the like. Hereinafter, description will be made with reference to FIGS. FIG.
FIG. 3 is a vertical cross-sectional view showing a situation in which the shield type TBM 3 is excavating in which the TBM 1 and the shield excavator 2 are combined. TB
The cutter head 4 at the tip of M1 is rotated to excavate the face G and extend the jack 5 to form a tunnel cross section.
In these conventional tunnel excavators, when the rock mass 6 on the top or the side wall of the tunnel collapses and is mounted on the tunnel excavator, it is necessary to install a support while ensuring the safety of workers. For that purpose, it was necessary to first remove the collapsed rock mass 6 and install a shoring. The work of removing the collapsed rock mass 6 is a very dangerous work in itself, and the excavation work has to be interrupted during that time, and the work efficiency is greatly reduced because a considerable part of the work is manual work. become.

In order to avoid such a danger, there is a method of installing a liner (or a segment) as a method of installing a support without removing the collapsed rock mass 6. FIG. 5 is a longitudinal sectional view showing a situation in which a liner (or a segment) 7 is being constructed at the rear of the excavated area using the shield type TBM 3. After excavating the face G as described above, the liner (or segment) 7 is assembled inside the rear part of the shield 2, the shield jack 5 is extended, and at the same time, the thrust jack 9 is contracted and the TBM body 1 is advanced. The space between the liner (or segment) 7 and the tunnel wall is later filled with a backfill material 8 such as pea gravel or mortar. According to this method, there is no danger of the rock mass 6 falling into the tunnel cross section, and the work can be performed safely. However, if the rock mass 6 at the top or side wall of the tunnel collapses on a large scale, it is necessary to construct a liner (or segment) 7. Not only is the support capacity excessively large and uneconomical,
The work becomes large and there is a problem in terms of construction period and construction cost.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned conventional problems, and provides a tunnel excavation method with good workability and inexpensive continuous supply by a simple method. The purpose is to:

[0005]

SUMMARY OF THE INVENTION The present invention relates to a method for excavating a tunnel and installing a shoring behind the excavation. With this, the support material is supplied continuously to the rear of the excavation, and is a tunnel excavation method by continuous supply support. In addition, the support material is formed in a roll shape or a folded shape, and the support material storage box is provided. The tunnel excavation method by continuous supply support, characterized in that it is continuously supplied from a supply port provided in the upper half section of the tunnel excavator, and is further supplied continuously. The support material is a tunnel excavation method using continuous supply support, characterized in that the support material is divided and supplied to the top of the tunnel and both side walls of the tunnel.

[0006]

Embodiments of the present invention will be described below with reference to the drawings.

[0007]

FIG. 1 is a longitudinal sectional view of a tunnel excavation method using continuous supply support according to the present invention, and FIG. 2 is a plan view of a portion where a support material is installed. The tunnel excavator used in the present invention may be an open type TBM, a shield excavator, or the like, but the case where the above-mentioned shield type TBM is used will be described. Excavator TBM1 equipped with cutter head 4 at the tip in the excavation direction
And a shield 2 in which the entire TBM 1 is covered with a skin plate 9. Supporting material Inside the TBM 1, a supporting material 11 that is rolled or folded and stored in a supporting material storage box 10 is installed. Supply ports 12 are provided at the top and both side walls of the skin plate 9, and the support material 11 is sent out. The material of the support material 11 may be selected according to the geological conditions of the site, such as wire mesh or cloth, and the size of the construction. Drilling machine A drilling machine 13 is installed at the rear end of the TBM 1 to serve as a drilling device for driving rock bolts.

[0008]

The tunnel excavation method using continuous supply support will be described with reference to FIGS.

<A> Pulling out the support material In FIG. 1, when the rear part of the shield type TBM 3 starts to be attracted toward the face G by stretching the front gripper 16 and contracting the thrust jack 7, the support material storage box 10 The support material 11 is pulled out from the supply port 12 and applied to the rock at the rear end of the shield type TBM 3. At this time, in the case of the large shield type TBM3, one support material 11 is used.
It is not possible to cover most of the upper half section of the tunnel by itself, so the support material 11 must be divided into a top portion and side wall portions and pulled out. Therefore, the supply port 12 needs to be divided into three as shown in FIG. When the support material 11 to be used is made of a wire mesh, the support material may be a roll-wound type, and when it is made of a cloth, it may be a folding type.

<B> Fixing of the support material The support material 11 pulled out to the rear end of the shield type TBM 3
Is rocked by a drilling machine 13 installed at the rear end thereof, and a rock bolt 14 is driven to fix the rock to the rock.
(FIGS. 1 and 2) The support members 11 installed on the top of the tunnel and the support members 11 installed on both side walls of the tunnel are integrated. FIG.
Is a cross-sectional view showing a state in which the support material 11 is laid.
In addition to the above method, there is also a fixing method in which the support material 11 is pressed against the rock by embedding a steel support material (H steel).

<C> Laying and fixing the support material With the excavation of the shield type TBM 3, the support material 11 whose end is fixed is automatically pulled out from the support material storage box 10 and laid along the rock surface. To go. The laid support materials 11 are sequentially fixed to the rock surface by driving the lock bolts 14. By laying and fixing the support material 11, the rock mass 6 in the upper half section of the tunnel can be continuously excavated without collapsing and securing the designed section of the tunnel. Although the rock material 6 is prevented from collapsing by the support material 11, when the deformation of the tunnel cross section cannot be suppressed only by the lock bolt or the steel support material, it can be dealt with by constructing the sprayed concrete.

[0012]

Since the present invention has been described above,
The following effects can be obtained. <A> Since the supporting material may be selected according to the geological conditions and the size of the construction scale, a reasonable construction can be performed. <B> Since the support materials can be installed in parallel with the excavation work,
Efficient construction can be achieved. <C> Since the installation of the support material is performed in parallel with the excavation work, the work can be performed safely without the rock mass falling down.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view of a tunnel excavation method using continuous supply support according to the present invention.

FIG. 2 is a plan view of the same.

FIG. 3 is a transverse sectional view of the same.

FIG. 4 is a longitudinal sectional view showing a conventional excavation situation.

FIG. 5 is a longitudinal sectional view showing another conventional excavation situation.

Claims (3)

[Claims] A method for digging a tunnel and installing a shoring behind the digging, wherein a shoring material is stored inside the tunnel digging machine, and the shoring material is continuously provided as the tunnel digging machine excavates. A tunnel excavation method with continuous supply support, characterized by being supplied to the back of the tunnel. 2. The tunnel excavation method according to claim 1, wherein the support material is stored in a support material storage box in a roll shape or a folded shape, and an upper half section of the tunnel excavator. A tunnel excavation method with continuous supply support, characterized by continuous supply from a supply port provided in the facility. 3. A tunnel excavation method according to claim 1 or 2, wherein the continuously supplied support material is divided into a tunnel top portion and a tunnel side wall portion. Tunnel excavation method with continuous supply support characterized by being supplied.