JPS5845557B2 - How to install a through pipe in a shield segment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of installing a through pipe in a segment forming a shield tunnel.

When constructing a shield tunnel, in order to ensure work safety and reliability, the shield tunnel should be equipped with observation pipes to check for bends, communication with the above ground, water supply, drainage, exhaust, etc. In many cases, it is necessary to install a connecting pipe for concrete, a concrete injection pipe for pouring secondary concrete, or a freezing pipe for improving the ground at the bottom of the tunnel using freezing methods. To install the shield tunnel, a hole must be drilled into the segment, and the hole must be constructed in such a way that water and earth and sand from the outer periphery of the shield tunnel do not enter into the shield tunnel.

Conventionally, when installing a through pipe in a segment of a shield tunnel, a chemical solution was injected into the ground around the area where the segment was to be drilled to harden the ground and protect it from infiltration of water and earth. It is difficult to prevent the infiltration of water and earth and sand by simply injecting this chemical solution.

In view of the above-mentioned circumstances, the present invention has been made for the purpose of providing a method for safely and reliably installing a through pipe in a shield segment that constitutes a shield tunnel. When installing a penetration pipe in a shield segment, a hole is drilled from the ground surface etc. using a poling machine to the surface of the segment, using a pipe whose inner diameter is larger than the outer diameter of the previous penetration pipe as a guide pipe. After closely fixing a straight 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 water stop material is injected into the seal case to p'riRL. ,
The present invention is characterized in that a required tube is inserted into the guide tube, the iron tube is used to pierce the seal case, and appropriate locations of the iron tube are closely fixed to the seal case.

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

1 is a shield segment that constitutes a shield tunnel,
Reference numeral 2 denotes a guide tube having an inner diameter larger than the outer diameter of the tube to be installed through the segment (IK).A bit B is provided at the tip of the guide tube, and a hole is bored at the point 1 where it reaches the surface of the segment 10 from the ground surface using a poling machine.

Reference numeral 3 denotes a seal case that is tightly attached to the inner piece of the portion of the segment 1 that the guide tube 2 reaches, and is made of metal and has a straight shape that is larger in diameter than the guide tube 1. If the segment 1 is made of iron, the seal case is made of metal by welding. If segment 1 is made of concrete, it is tightly fixed to segment 1 using anchor bolts.

4 is a valve provided in the seal case 3; 5 is an auxiliary injection valve; and 6 is a valve provided in the seal case 3 from the guide pipe 2 and the valve after a hole 7 is provided through the segment 1 through the guide pipe 2. The water stop material 6 is made of injected mortar or the like, and the water stop material 6 fills the seal case 3 and the lower part of the guide pipe 2, and enters the ground around the outer periphery of the iron pipe through the gap between the guide pipe 2 and the hole 7.

8 is a pipe to be installed through the segment 1, which is inserted into the guide pipe 2 from the ground, polls the water stop material 6 inside the lower part of the guide pipe 2 and inside the seal case 3, and furthermore, the bottom plate of the seal case 3 [pierces and It is made to protrude from the case 3, and when it protrudes to a required length, it is tightly fixed to the seal case 3 by welding.

That is, in the present invention, as shown in FIG. , a hole is drilled at a point 1 reaching the surface of the segment 10 from the ground surface using a poling machine, and a ridge larger than the outer diameter of the guide tube 2 is formed on the inner surface of the segment 1 at a location corresponding to the hole, as shown in FIG. After the seal case 3 made of eggplant iron is tightly fixed, a hole 7 is formed by penetrating the segment 1 at the tip of the guide tube 2 using a poling machine again, as shown in FIG. As shown in FIG. 4, a water-stopping material 6 such as mortar was injected into the case 3 through the valve, and a water-stopping layer of the water-stopping material 6 was formed inside the case 3 and the lower part of the guide pipe 2 and its surroundings. After that, the tube 8 is inserted into the guide tube 2, and the lower part of the guide tube 2 and the water stop material 6 in the seal case 3 are polled using a polling machine.
As shown in the figure, a hole is drilled in the bottom plate of the seal case 3 and the tube 8
This is a method of installing the tube 8 through the shield segment 1 by making the lower end protrude from the case 3 and, when the tube 8 protrudes for a required length, tightly fixing the tube 8 to the bottom plate of the case 3 by welding. After installing the guide tube 8, the guide tube 2 shall be removed or the guide tube 11 shall be buried.

Although, in the above embodiment, a through pipe is installed from above in the upper shield segment constituting the shield tunnel, the present invention is not limited to this.

In other words, it can of course be applied when installing a penetration pipe in the shield segment of a survey section, and it can also be applied when a frozen pipe is penetrated and buried to improve the ground at the bottom of a shield tunnel. .

The present invention is as described above, and when installing a through pipe in a shield segment constituting a shield tunnel, the part of the segment where the through pipe is to be installed is completely watertight using a guide pipe, a seal case, and a water stop material. Since the work was carried out in the condition that the through pipe was installed safely and reliably, it was possible to install the through pipe safely and reliably. , or when a freezing tube is installed through the pipe.

[Brief explanation of drawings]

The figure is a schematic diagram of a process showing an example of implementing the method of the present invention.
The figure shows the state in which the hole has been drilled to the surface of the shield segment using the guide tube as a guide, Figure 2 shows the state in which the seal case is tightly fixed to the inner surface of the shield segment, and Figure 3 shows the state in which the seal case is tightly fixed to the inner surface of the shield segment.
The figure shows the state in which the shield segment is perforated with the guide tube, Figure 4 shows the state in which aqua regia material is injected into the seal case, and Figure 5 shows the state in which the pipe to be penetrated is inserted into the guide tube and the seal case is perforated. FIG. 6 is a diagram showing a state in which the guide tube is tightly fixed to the case by welding, and FIG. 6 is a diagram showing a state in which the guide tube is removed. 1... Shield segment, 2... Guide tube, 3...
- Silt case, 6...Water stop material, 8...Pipe.

Claims (1)

[Claims] 1 When installing a through pipe in a shield segment constituting a shield tunnel, a hole is drilled from the ground surface etc. using a poling machine on the surface 1 of the segment using a pipe whose inner diameter is larger than the outside diameter of the said through pipe as a guide pipe. , After tightly fixing a straight seal case larger than the diameter of the guide tube to one surface of the internal bond at the location corresponding to the perforation part of the segment, and after piercing the segment with the guide tube, the seal case is watertight. A seal segment characterized by injecting a material to stop water, inserting a required pipe into the guide pipe, perforating the seal case with the iron pipe, and closely fixing an appropriate part of the iron pipe to the seal case. How to install a through pipe.