JPS5942795B2 - How to install a through pipe in a ductile shield segment - Google Patents

Description

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

When constructing a shield tunnel, in order to ensure the safety and reliability of the work, it is necessary to install observation pipes in the shield tunnel to check for bends, communication with the above-ground part, water supply, drainage, exhaust, etc. In many cases, it is necessary to install a connecting pipe for concrete work, a concrete injection pipe for pouring secondary concrete, or a frozen pipe for improving the ground at the bottom of the tunnel using the freezing method. In order to install a pipe, 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 inventor of the present invention has previously developed a method for safely and reliably installing a through pipe in a shield segment that constitutes a shield tunnel, and has already filed a patent application for the same in Japanese Patent Application No. 54-26745. It's inside.

In this method, 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 to the surface of the segment using a pipe whose inner diameter is larger than the outer diameter of the through pipe as a guide pipe, After closely fixing a sieve-shaped seal case larger in diameter than the guide tube to the inner surface of the segment at a location corresponding to the perforation, the guide tube perforates the segment, and then a water stop material is injected into the seal case. In this method, a through pipe is installed by inserting a required pipe into the guide pipe, piercing the seal case with the skeleton, and tightly fixing an appropriate part of the skeleton to the seal case. Although it is extremely useful if the segments are made of steel, it is not necessarily suitable for installing a through pipe in a shield segment using ductile segments, which have recently become widely used.

The reason for this is that ductile segments are made of cast iron called nodular cast iron or ductile cast iron, which has poor weldability compared to steel segments, making it difficult to attach the seal case and therefore preventing water from penetrating parts. This is because it is difficult and thick (there is a risk of damage if it is penetrated).

However, as mentioned above, since ductile segments have recently been used extensively, there is a demand for the development of a method for safely and reliably installing a through pipe in a ductile shield segment using ductile segments.

The present invention has been made for the purpose of providing a method that satisfies the above-mentioned needs, and its configuration is such that when forming a shield tunnel using ductile segments,
In the shield tunnel, an annular indirect plate made of steel or the like that matches the shape of the mounting frame is fixed between the shield segment frame corresponding to the part where the penetration pipe is to be installed and at least the shield segment frames before and after it, and the penetration pipe is installed. When installing the pipe, after fixing the cover plate tightly so as to seal the entire circumference of the inner edge of the front and back joint plates or the segment where the through pipe is to be installed, the inner diameter is measured from the ground surface etc. using a polling machine. After drilling a hole in the segment using a guide tube having a diameter larger than the outer diameter of the through tube (and having a bit at the tip), a water stop material is injected between the segment and the cover plate to stop the water. The present invention is characterized in that a through tube is inserted into the guide tube, the limb tube is used to pierce the lid plate, and appropriate locations of the limb tube are closely fixed to the lid plate.

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

Reference numeral 1 designates a ductile segment constituting a shield tunnel, and the ductile segment 1 is assembled into a ring shape to form a shield segment frame A.

On the other hand, when a through pipe T is to be installed in the uppermost segment 1a of the shield segment frame A in a shield tunnel, when forming the shield tunnel,
Frame A and the frames A I before and after it.

Annular steel indirect plates B, B1 having a shape that conforms to the front shape thereof are interposed between and fixed to A2, and the indirect plates B,
A cover plate C is welded to the entire circumference of the inner edge of B1, and an injection valve V and an auxiliary injection valve v1 are installed in a portion of the cover plate C corresponding to segment lla.

Next, a hole 2 is bored in the segment Ila from the ground surface using a poling machine using a guide plate G whose inner diameter is larger than the outer diameter of the through pipe T and which has a pin (b) at the tip, and then the segment 1a and the lid are drilled from the injection valve V. After injecting a water-stopping material 3 such as mortar between the segment 1a and the cover plate C and forming a water-stopping layer between the segment 1a and the cover plate C and the lower part of the guide tube G and its surroundings using the waterstopping material 3. , insert the through pipe T into the guide pipe G, poll the water stop material 3 through the pit b, and then insert the cover plate C.
The lower end of the penetrating tube T is made to protrude from the cover plate C by drilling a hole, and when the lower end of the penetrating tube T is made to protrude from the cover plate C and the required length is protruded, the limb tube T is tightly fixed to the cover plate C by welding 4, and the penetrating tube T is connected to the segment 1a.
The guide tube G shall be removed or buried as is.

In the figure, reference numeral 5 denotes a fixing device that integrally connects the segments 1.degree. 1a, 1 and the indirect plates B, B1.

In the above embodiment, an example was described in which the through pipe T is installed from above in the uppermost segment 1a of the shield segment frame A constituting the shield tunnel, but the present invention is not limited to this.

That is, it can of course be applied to the case where a through pipe is installed in a side segment, and it can also be applied to the case where a frozen pipe is penetrated and buried in order to improve the ground at the bottom of a shield tunnel.

Furthermore, in the above embodiment, the indirect plate was placed between the shield segment frame in which the through pipe is installed and the shield segment frames before and after it, but in actual shield construction, it is necessary to Since the shield segment frame where the penetration pipe should be installed may shift from the planned position, if necessary, place an indirect plate between several frames in front and behind the segment frame, and install the penetration pipe in the segment frame at an appropriate position. You may also set it up.

The present invention is as described above, and when a shield tunnel is formed using ductile segments, a shield segment frame corresponding to a power part where a through pipe is installed in the shield tunnel and at least shield segment frames before and after the shield tunnel are connected. An annular indirect plate made of steel or the like that matches the shape of the mounting frame is fixed in between, and when installing a through pipe, the entire circumference of the inner edge of the front and back indirect plates or the segment where the through pipe is to be installed is fixed. After the lid plate is tightly fixed so as to be sealed, a guide pipe is used to perforate the segment from the ground surface or the like, and a water stop material is injected between the segment and the lid plate to stop water.
This is a method of installing a through tube in a ductile segment by inserting a through tube into the guide tube, perforating the lid plate with the limb tube, and closely fixing appropriate parts of the limb tube to the lid plate, and by welding. The ductile segments, which are not very durable and can be damaged if large holes are drilled, and are difficult to stop water, are sealed with the indirect plate and the cover plate before the installation work of the through pipe is carried out. There is no risk of earth and sand infiltrating into the shield tunnel even if the segment is damaged when the guide pipe is used to drill into the segment, and water can be effectively stopped by injecting a water-stopping material between the segment and the cover plate. Therefore, even if a hole is made in the cover plate by a through pipe, there is almost no possibility that earth and sand will infiltrate into the shield tunnel through the hole.

Therefore, according to the method of the present invention, an observation pipe for checking the bending of the shield tunnel formed by the ductile segment, a pipe for communicating with the ground, a concrete injection pipe, or a freezing pipe is installed through the shield tunnel. It is extremely useful in practical applications.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an example of a shield tunnel in which the method of the present invention is carried out, and FIGS. These are schematic diagrams: Figure 2 is a diagram showing a state in which a cover plate is welded to an indirect plate interposed between ductile segments and sealed;
The figure shows a state in which the segment is perforated with a guide tube,
Figure 4 shows a state in which clean water material is injected between the segment and the cover plate, and Figure 5 shows a state in which the through pipe is inserted into the guide pipe, the cover plate is perforated, and tightly fixed to the cover plate by welding. FIG. 6 is a diagram showing a state in which the guide tube has been removed. 1...Ductile segment constituting a shield tunnel, 1a...Ductile segment where a through pipe is to be installed, A, AI, A2...Shield segment frame, B, B1 ...Indirect board, C...
...Lid plate, G...Guide tube, T...
Penetration tube.

Claims (1)

[Claims] 1. When forming a shield tunnel using ductile segments, there is a space between the shield segment frame corresponding to the part of the shield tunnel where the through pipe is to be installed and at least the shield segment frames before and after the shield tunnel according to the desired shape. When an annular indirect plate made of steel or the like is fixed and a through pipe is installed, a cover plate is attached so as to seal the entire circumference of the inner edge of the front and back indirect plates or the segment where the through pipe is to be installed. After tightly fixing, a hole is drilled into the segment from the ground surface using a polling machine using a guide tube whose inner diameter is larger than the outer diameter of the through tube and is equipped with a bit at the tip, and then a stopper is inserted between the segment and the cover plate. A ductile shield segment characterized by injecting a water material to stop the water, inserting a through pipe into the guide tube to pierce the cover plate with the skeleton, and closely fixing appropriate parts of the skeleton to the cover plate. How to install a through pipe in.