JPS5876700A - Method of installing penetrating pipe to shield segment under compressed air - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for installing a penetrating pipe in a shield site located above ground or in an empty state.

- When constructing a shield tunnel in N, in order to ensure work safety and reliability, the shield tunnel should be equipped with observation pipes for carrying out the check in song 9, and communication pipes with the above-ground part. , Contact to facilitate water supply and drainage, etc.! If there is a need to pay for concrete pipes for pouring concrete pipes, or frozen glaze pipes for improving the ground at the bottom of tunnels. However, in order to install the above-mentioned pipe, it is necessary to drill a hole in the shield segment, and when drilling the hole, the earth and sand of the outer shell should not enter into the rolled tommel circle.

For this purpose, a tube with a diameter of just 90 mm outside the receiving tube is drilled from the ground surface, etc., up to the surface of the segment as a guide bolt, and After closely fixing a @-shaped seal case larger than the diameter of the guide tube to the inner surface of the segment, the guide tube perforates the segment, and then a waterproof material is applied around the seal case and the guide tube. After injecting and filling the water to stop the water, insert the appropriate pipe into the guide pipe, pierce the seal case of the iron pipe, and tightly fix the appropriate parts of the iron pipe to the seal case, and then the shield segment. (See No. 55-119891 F).

This conventional method is suitable for ordinary shield construction, but is somewhat unsuitable for shield construction under pressure. The reason for this is that the use of gas and electricity in the shield tunnel under pressure is subject to safety restrictions, so there is no problem with heating the seal case, and the pipes in the shield segment are This is because when the shield penetrates, a pressure air leak occurs and the pressure inside the shield is rapidly reduced, causing the collapse of earth and sand on the face surface and water gushing, which may have a great impact on the workers inside the shield.

The present invention has been made in view of the above-mentioned prior art, and aims to provide a method for safely and reliably installing a through pipe into a shield segment under pressure from above the ground or from an unpressurized pneumatic paddle. Its composition is
When installing a through pipe in a shield segment constituting a shield tunnel under pressure, a poling machine is used to install the through pipe of the segment from the ground surface, etc. using a pipe whose inner diameter is larger than the outside diameter of the through pipe as a guide pipe. The guide tube is buried up to the surface of the segment, and a water stop material is injected from the guide tube into the periphery of the portion of the segment and inside and outside the tip of the guide tube to stop water and fix the guide tube. If the diameter is smaller than that and a blade is installed at the tip, insert a tube with a backing and a stopper for preventing pressure leaks and water stops at an appropriate distance from the tip, and use the iron tube to tighten the stop in the guide tube. The water material and the segment are perforated, and the backing is tightly fitted into the hole.

Next, an example of implementation of the present invention will be explained with reference to the drawings.

1 is a shield segment constituting a shield tunnel under pressure; 2 is a guide pipe with an inner diameter larger than the outer diameter of the pipe to be installed through the segment; buried with a hole machine until it reaches the surface of segment 1 from the ground surface;
A water stop agent 6 is injected from the guide pipe 2 into the upper part of the segment 1 and the lower part of the guide pipe 2 inside and outside to prevent pressure air from leaking into the ground during penetration and to stop water. Reference numeral 4 denotes a pipe to be installed through the segment 1, which has a diameter smaller than the inner diameter of the guide pipe 2, and has a blade 5 at its tip for piercing the water supply material 3 in the guide pipe 2 and the segment 1, and a suitable hole is inserted from the tip. A backing 6 for preventing pressure leakage and water stopping is placed at a separate location, and a stopper 7 is placed on it.
The iron pipe 4 is inserted into the guide pipe 2 from the ground,
n5, the water stop material 6 in the guide pipe 2 is polled, and the segment 1 is perforated and further lowered to form the segment 1.
By tightly fitting the backing 6 into the hole drilled in the hole, the gap between the segment 1 and the pipe 4 is established, and at the same time, pressure leakage is prevented and the backing is stopped. The added water pipe, 9, is an on-off valve installed in the middle of the iron pipe.

That is, in the present invention, first, the guide tube 2 is provided with a tube whose inner diameter is larger than the outer diameter of the tube 4 to be installed through the shield segment 1.
Then, the water stop material 3 is injected from the guide pipe 2 into the upper part of the segment 1 and the lower part of the iron pipe inside and outside, so that when the pipe 4 penetrates, the ground is buried. After preventing the leakage of pressure air and stopping the water, the pipe 4 is inserted into the guide pipe 2 from the ground, and while the water is being fed from the water pipe 8, the polling machine is used to clean the inside of the guide pipe 2 with the blade 5 at the tip of the polling machine. After poling the water stop material 3 and drilling the segment 1, the on-off valve 9 is closed to stop water supply, and the tip of the pipe 4 is made to protrude into the shield tunnel, and the segment is backed into the hole formed in the segment 1. By tightly fitting the backing 6, the gap between the segment 1 and the pipe 4 is fixed, and at the same time, the pressure leak +177+L and the block are prevented. Caulking 10 with a binder or the like is performed to prevent pressure leaks and water supply.

Therefore, the tip of the tube 4 is threaded to provide a space for the blade 5. After the W of f4 is threaded through, the blade 5 is removed, and when the tube 4 is not in use, a blind cover 11° is installed at both ends. Apply step 12 to completely remove the pressure part! ! Complete the work by cutting.

Incidentally, pressure air leakage occurs between the time when the segment 1 is perforated by the pipe 4 and the backing 6 is tightly fitted into the hole of the segment 1. , In order to prevent this, the guide pipe 2 is
A bunker P for air leak prevention IE may be provided between the pipe 4 and the pipe 4.

Further, in the above embodiment, an example was described in which a through pipe is installed in a shield segment in a pressurized state from the ground, but the present invention is not limited to this. It can also be applied when installing.

Since the present invention is as described above, it is suitable as a method for installing a one-way pipe in a shield segment constituting a shield tunnel under pressure.

[Brief explanation of drawings]

The figure shows an example of the implementation of the present invention. Figure 1 shows a guide pipe buried from the ground, and municipal water material is injected around the surface of the segment and the inner and outer periphery of the front part of the guide pipe, forming a one-way pipe. Figure 2 is a cross-sectional view of the main part of the tube inserted into the guide tube and the blade provided at the tip of the core tube poling the water stop material injection part in the guide tube. A cross-sectional view of a segment with a hole drilled and a banking tightly fitted into the hole, Figure 3 shows the state shown in Figure 2 with caulking applied to the gap between the tube and the segment and No. 14 applied to both ends of the tube. FIG. 1...Shield segment, 2...Guide pipe, 6...Water stop material, 4...Pipe that becomes a through pipe, 5... ...Blade, 6...Backing, 7...Stopper, 10...Caulking, 11.12...1 piece ¥3 Prisoner

Claims (1)

[Scope of Claims] 1. When installing a through pipe in a shield segment constituting a shield tunnel under pressure, a polling machine is used to insert a pipe whose inner diameter is larger than the outer diameter of the through pipe from the ground surface etc. as a guide pipe. The penetration pipe of the distribution segment is buried up to the surface of the part where it is to be installed, and a water stop material is injected from the guide pipe into the vicinity of the pre-formed part of the segment and inside and outside the tip of the guide pipe to stop the water, and A circular pipe is fixed, and a pipe with a smaller diameter and a blade at the tip and a packing and a stopper for preventing pressure leaks and water stops is inserted into the guide tube at an appropriate distance from the tip. A method for installing a penetrating pipe in a shield segment under pressure, characterized in that the pipe is used to make a hole in the water stop material in the guide pipe and the segment, and the packing is tightly fitted into the hole. 2. The method according to claim 1, wherein a packer for preventing air leakage is provided between the guide pipe and the pipe.