JPH04198583A - Tunnel connection method - Google Patents

Abstract

PURPOSE:To make it possible to excavate a connection section by boring the ground to separate the connection section between an existing and new tunnels to pass through a plurality of leading holes, and driving a wire-saw inserted in the shape of a loop between adjacent leading holes to separate the separated ground. CONSTITUTION:A segment of a line is described on the surface of the separated ground E2 along the form of a section of a new tunnel 2 to divide part to be excavated into a plurality of sections crosswise, and an intersecting point of the segment of the line and the circumferential edge of the new tunnel 2 is bored to pass through and to form a plurality of leading holes 3 attained to the existing tunnel 1. After that, a diamond wire-saw 4 is inserted between a pair of adjacent leading holes 3 nearest among them, it is pulled around the existing tunnel 1 side in the shape of a loop, and the wire saw 4 is guided by a guide pulley 5 inside the new tunnel 2 to hang one end of a loop on tension pulley 6. A pulling device 7 is driven, and the separated ground E1 is cut from the surrounding ground E with the wire saw 4.

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention enables the final process of opening the tip of a new tunnel into an existing tunnel without destroying the surrounding ground or the existing tunnel structure, and without destroying the existing tunnel. This invention relates to a tunnel connection construction method that allows for reliable tunnel penetration while minimizing the impact on traffic within the tunnel.

(Prior art) In some cases, a new tunnel for evacuation, communication, or ventilation is constructed by crossing an existing tunnel in use.

In the case of existing tunnels or mountain tunnels, which were formed by excavating relatively hard rock, when excavating a new tunnel, it is necessary to crush the rock using blasting methods etc. to excavate the new tunnel until it reaches the point where the existing tunnel connects. can.

However, if blasting is carried out during the final process, i.e., when the excavation of a new tunnel has progressed to the vicinity of the intersection with the existing tunnel, the vibration, noise, and scattering of rocks will have an impact on the structure of the existing tunnel. Or big.

In addition, the existing tunnel has a certain amount of traffic even though it is under construction, so it is extremely dangerous to consider the impact that could have on third parties passing through the tunnel during blasting.

Therefore, in the vicinity of this connection position, there are various excavation methods described in (a) to (d) below as alternatives to the above-mentioned blasting method, but all of them have problems.

(Problem to be solved by the invention) (a) Crushing with static crushing agent - method: It takes time and the crushing effect is not constant. Additionally, structures with reinforced steel cannot be crushed, and there may be safety issues.

(b) Water gesotho method: There is a limit to the depth of rock excavation, and it is inefficient.

(c) Slot drilling: The machine is larger, there are restrictions on the cross section of use, and it is accompanied by vibration and noise.

(d) Rock splitting machine: Small machines have limited rock splitting capacity and are accompanied by noise and vibration during operation.

This invention solves the above problems, and enables the use of small equipment to perform excavation work at the connecting location of both tunnels without having a major impact on the surrounding ground, the existing I/N tunnel 474 structure, traffic, etc. This provides a tunnel connection method that can perform the following steps.

(Means for Solving the Problems) In order to achieve the above object, the present invention 71-method provides the method of the present invention, in which, in the final step of excavating a new tunnel that has been dug towards an existing tunnel, the ground separating the connection between the painted tunnels is A plurality of conducting holes are formed between the tunnels by drilling, a wire saw is inserted in a loop between adjacent conducting holes, and the wire saw is driven to rotate endlessly while applying tension within the new tunnel. The isolation ground is separated from the surrounding ground by repeating the cutting operation along the line segment connecting the guide holes.

Further, in this invention method, after the isolated ground is separated from the surrounding ground, the wire saw is inserted between the opposing vertical or horizontal conducting holes, and cutting is performed along a line segment connecting the conducting holes. The isolated ground is divided into a plurality of blocks vertically and horizontally.

Furthermore, when dividing into the blocks, the bottom part of the block is divided with at least one side of the block being connected, and after inserting a conveyance table into the divided bottom part, the connected side is divided. .

(Function) According to the second configuration, when the cutting work with the wire saw is completed, the isolated ground is separated from the surrounding ground, so processing such as crushing and removal can be carried out without affecting the surrounding ground or the existing tunnel. I can do it.

In addition, when the isolated ground is further divided into blocks, each block is pulled out and carried out in sequence to open the space between both tunnels.

At this time, by placing a conveyance table in advance under each block, the separated blocks can be easily pulled out by pulling out the conveyance table.

(Example) Hereinafter, an example of the present invention will be described in detail using the drawings.

In Figure 1, 1 is an existing tunnel that was obtained by excavating the ground E, such as a tight bond, and 2 is a new tunnel that was excavated toward the existing tunnel 1 by intersecting this existing tunnel 1 and using the open blast method. It's a tunnel.

At the point of intersection between the tip of the new tunnel 2 and the existing tunnel 1, there is a ground (hereinafter referred to as isolated ground) consisting of unexcavated tight ground (hereinafter referred to as isolated ground) El and the existing It is isolated by RC concrete 1a, which is a structure that constitutes the outer shell of the tunnel 1.

The present invention is particularly a construction method for excavating this portion.

2 to 5 show a first embodiment thereof.

First, along the cross-sectional shape of the new tunnel 2, line segments are drawn on the surface of the isolation ground E1 located in front of it, as shown by the chain lines in Figure 2, and the excavated sections are divided into multiple vertical and horizontal directions. compartmentalize.

Next, by drilling a hole at the intersection of the drawn line segment and the periphery of the new tunnel 2, as shown in Figures 2 and 3, the existing A plurality of guiding holes 3 are formed vertically and horizontally to reach the tunnel.

Next, the diamond wire saw 4 is inserted between the closest pair of adjacent guide holes 3 of each guide hole 3, and routed around the existing l/channel side in a loop shape.

This wire saw 4 and the cutting device including the same are vibration-free.
This is a known device for cutting tight joints without noise.
Inside the new tunnel 1, the wire saw 4 is guided by a guide pulley 5, and one loop end is suspended from a tension pulley 6.

After this preparatory work, when the rotation and traction device 7 equipped with the tension pulley 6 is driven, the wire saw 4 is rotated endlessly and pulled in the direction of the arrow, and the other loop end cuts the isolation ground E1 and creates a new tunnel. Approach the second side.

When the other loop end of the wire saw 4 finally reaches the surface of the isolated ground E1, the cutting operation along the line connecting the adjacent guide holes 3 is completed.

By repeating the above-mentioned cutting work sequentially along the periphery of the new tunnel 1, the isolation ground E1 is formed into the guide hole 3 as shown in Figure 4.
They are connected to each other and separated from the surrounding ground E in a three-dimensional shape that roughly follows the inner circumferential shape of the new tunnel 2 (on the existing tunnel 1 side, RC concrete 1a is also separated from the surrounding ground roughly along the cross-sectional shape of the new tunnel 2) ).

Therefore, the subsequent treatment is to crush the inside of this isolated isolated ground E1, for example, by using a crushing method using a static crushing agent or a rock drill, and even if it is divided into pieces, there will be no impact on the surrounding ground E or the existing tunnel] The effect on the structure can be prevented.

In this case, more preferably, the wire saw 4 is inserted between the guide holes 3 facing each other in the longitudinal direction and the lateral force direction.
,” If you repeat the work on the 1st blade side in the same way as in 1, you will finally get the 5th blade.
As shown in the figure, the inside of the isolation ground El is divided into rectangular blocks E1-1 with a cross-sectional area x L (distance of the isolation ground E1) surrounded by the vertical and horizontal lines between each guide hole 3 (RC concrete side (The same applies), it becomes possible to carry out the work in parts.

After that, by using heavy equipment for carrying out and carrying out the carrying out work while pulling out each block E1-1 sequentially from the top, a cavity that follows the cross-sectional shape of the new tunnel 2 or opens on the existing tunnel 1 side, and both tunnels ], it will be open for about 2 minutes.

In each of the following steps, traffic within the existing tunnel 1 is restricted mainly when drilling the guide hole 3, when the wire saw 4 is routed toward the existing tunnel, and at the initial stage of cutting. Other than that, there is no major impact on traffic.

In addition, if the cross section of the new tunnel 2 is large or if the isolation ground E1
If the distance is only long, as shown in FIG. You can do the work.

FIGS. 7 and 8 show a second embodiment that takes into account the workability of pulling out each block E1-1 to be divided.

In the figure, a portion corresponding to the bottom side of each block E1-1 is divided in advance by the wire saw 4, and a block conveyance table 8 is inserted into this divided portion E1''-2.

This conveyance table 8 is made of an iron plate or the like and is able to withstand the load and has a slippery surface (1-S pickles, with a handle 8a on the drawer end side) for use as a handhold.

With this conveyance table 8 inserted, if the other pieces including the upper part are cut vertically and horizontally along the line connecting the guide holes 3a (or 3), the remaining upper and side parts The block E<b>1 - 1 with its sides cut off is placed on the conveyance table 8 .

Therefore, by pulling out the carrier 8 using the handle portion 8a as a handhold, the block E1-1 is removed from the wall surface of the isolation ground E1 while being placed on the carrier 8.

In this embodiment, the tip of the new tunnel 2 is opened to the existing tunnel 1 side one by one by repeating the cutting operation and the pulling operation of the block E1-1 cut by this process alternately.

In addition, in the embodiment shown in FIG. 7.8, the block E1-1
It is also possible to insert the carrier 8 by cutting off the bottom part with either the top or side sides connected.

(Effects of the Invention) - As explained in detail in each embodiment, in the tunnel connection method according to the present invention, the cutting work is performed using a wire saw, so the work progresses without vibration and noise, creating a good working environment. It is. In addition, since no impact is involved, there is no destructive effect on the surrounding ground or existing tunnel structures, making it highly safe. Furthermore, cutting equipment including wire saws can be made smaller.
Not restricted by tunnel cross section.

Furthermore, by further cutting the isolated ground separated from the surrounding ground into individual blocks, these blocks can be separated and transported, and once the transport work is completed, the new tunnel will be opened to the existing tunnel.

In addition, when pulling out the cut blocks,
The block can be pulled out by pulling out the conveyance stand that has been installed in advance on the bottom side of the block, which further simplifies the work of carrying out the block.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the state of the intersection of the existing I-channel and the new I-channel to which this invention is applied, and FIGS.
The figure is an explanatory diagram showing a first embodiment of this invention, FIG. 6 is an explanatory diagram showing a modification of the first embodiment, and FIGS. 7 and 8 are explanatory diagrams showing a second embodiment of this invention. be. 1 ・Existing tunnel】a...RC concrete 2・New tunnel 3.3a・Guiding hole 4・・Wire saw 8・・Transport platform E Ground El・Isolation ground El-1...Block El-2...Cut Part patent applicant Osamu Obayashi Co., Ltd.
People Patent Attorney - Color Ken Axis
Patent Attorney Masatoshi Matsumoto Figure 5 50 Hi1-23a Figure 6

Claims (3)

[Claims] (1) In the final process of excavating a new tunnel that has been dug toward an existing tunnel; the ground separating the connection between both tunnels is drilled to form a plurality of conductive holes between the two tunnels, and the adjacent conductive holes are A wire saw is inserted between the holes in a loop shape, and the wire saw is rotated endlessly while applying tension inside the new tunnel to repeat the cutting operation along the line connecting the conductive holes, thereby removing the isolation. A tunnel connection method characterized by separating the ground from the surrounding ground. (2) After the isolation ground is separated from the surrounding ground, the wire saw is inserted between the opposing vertical or horizontal conducting holes and cutting is performed along the line segment connecting the conducting holes. The tunnel connection method according to claim 1, characterized in that the ground is divided into a plurality of blocks vertically and horizontally. (3) When dividing the block into blocks, the bottom part of the block is divided with at least one side connected, and after inserting a conveyor into the divided bottom part, the connected side is Claim 2 characterized in that it is divided.
Tunnel connection method described.