JPH10317882A - Jacking pipe of semi-shield method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To infect a friction reduction liquid into the tail void of a peripheral surface in uniform thickness while making a travelling car for works travel into a jacking pipe. SOLUTION: Pipelines (through-holes 30) reaching the delivery ports 40b of outer circumferential surfaces from the filler holes 40a of the inner circumferential surface of the jacking pipe 15 of injection pipes 40 on at least the bottom- section side in infection pipes 4, 40 being buried into the thick pipe of the jacking pipe 15 and injecting a friction reduction liquid 2 into a tail void 1 on the outside of the pipe from the inside of the jacking pipe 15 are formed on curved paths. Accordingly, the delivery ports 40b can be installed at places near to lowermost points, where the friction reduction liquid 2 rapidly reaches a bottom section before the generation of buoyancy, while mounting the filler ports 40a at places, where equipments disposed into the jacking pipe 15 are not a hindrance, and the friction reduction liquid 2 can be forwarded so as to form uniform thickness on the outer circumferential surface of the jacking pipe 15 together with the injection pipes 4 on the top-section side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a semi-shield method in which a propulsion pipe is buried in the ground, while reducing the frictional resistance between the propulsion pipe and a surrounding stratum at the time of propulsion.
The present invention relates to an improvement in the structure of a propulsion pipe for improving the work efficiency of a worker in the propulsion pipe.

[0002]

2. Description of the Related Art A semi-shield method has been adopted as a method for constructing a pipeline for storing sewerage facilities and various underground objects underground. In this method, as shown in FIG. 2, a jack 12 and a supporting plate 13 for supporting a reaction force are installed in a starting shaft 11, and a semi-shield excavator 14 which operates by excavating by rotation of a cutter 17 provided at a tip end thereof. Propulsion pipe 15 following
Is pushed by the jack 12 through the pressing wheel 16 to enter the underground, and while repeatedly adding and pushing the propulsion pipe 15, a pipeline is constructed in the ground to reach the reaching shaft.

At this time, the most important issue is to reduce the frictional resistance between the propulsion pipe 15 and the surrounding stratum in order to smoothly propel the propulsion pipe 15. A gap 1 of about 50 mm is provided between the peripheral surface and the stratum without directly contacting the peripheral surface and the stratum around it, and a friction reducing liquid 2 is injected into the gap 1 to reduce friction resistance. The main component of the friction reducing liquid 2 is sodium polyacrylate, and when water is added to form a transparent viscous material containing PH7 (neutral), a clogging effect is exhibited between the soil particles. A mud film (mud film) is instantaneously formed and shows an action of maintaining the liquid pressure. By the way,
The friction reducing liquid 2 has no pollution to human bodies, animals and plants, and the earth. The gap 1 into which the friction reducing liquid 2 is injected is called a tail void. FIG. 3 shows a device provided inside the propulsion pipe 15 for injecting the friction reducing liquid 2 into the tail void 1 and its installation specifications together with the formation in which the propulsion pipe 15 is embedded and the tail void 1 (and the friction reducing liquid 2). It is shown in cross section.

This device structure is provided at predetermined intervals along the length direction of the propulsion pipe 15, and at a cross section at that position, as shown in the drawing, a predetermined interval is provided along the inner circumference. A radial through hole 3 is provided at the set position, and a straight injection pipe 4 is embedded in the through hole 3. A distribution pipe 5 is arranged concentrically with the inner peripheral surface of the propulsion pipe 15 in a cross section in which the through holes 3 are arranged. Each of the injection pipes 4 is connected to the distribution pipe 5 through a nozzle 6 with a check valve. 5 are sequentially connected. A supply hose 7 for the friction reducing liquid 2 disposed along the length of the propulsion pipe 15 is connected to the distribution pipe 5, and the supply hose 7 is connected to the starting shaft 1 shown in FIG.
1 is connected to a friction reducing liquid pressurizing supply device 23 installed on the outside ground. The supply device 23 includes an injector 24, an instrument box 25, a pressure pump 26, and the like. In FIG. 3, reference numeral 8 denotes an electromagnetic valve. By opening and closing the electromagnetic valve 8, the friction reducing liquid 2 sent from the supply device 23 to the supply hose 7 is supplied to the tail void 1 or stopped.

[0005] With the above device configuration, the propulsion pipe 15
The friction reducing liquid 2 is injected into the tail void 1 outside the tube from the inside. As a result, the propulsion pipe 15 does not come into direct contact with the stratum, so that the friction resistance between the propulsion pipe 15 and the surroundings when the propulsion pipe 15 is advanced is markedly lower than when the tail void 1 filled with the friction reducing liquid 2 is not provided. Can be reduced.

[0006]

By the way, in the above-mentioned propulsion pipe 15, after the installation, a worker enters the inside and performs various works, but it is necessary to carry in and transport materials and tools for that. .

Conventionally, these operations are performed by a worker using a wheelbarrow. However, this is very labor-intensive, and particularly, in a narrow propulsion tube 15, a large movement of the body is required. Since it is not possible, the working efficiency is very poor.

Therefore, as shown by a dashed line in FIG. 3, a rail R is laid in the propulsion pipe 15 to drive an automatic traveling vehicle M, and materials and tools are transported by the traveling vehicle M.
We can solve this problem, but as shown in the figure,
Injection port 4a of injection pipe 4 provided on the bottom side of propulsion pipe 15
In the disposition position, the distribution pipe 5 and the traveling vehicle M interfere (directly interfere with the laying rail R of the traveling vehicle M), so that the traveling vehicle M cannot run. is there. In order to avoid this interference, it is sufficient to move the injection port 4a toward the top, but this causes a new problem.

That is, when the inlet 4a is moved toward the top, the outlet 4b also moves toward the top, but at the bottom, buoyancy is generated due to the influence of groundwater pressure.
The friction reducing liquid 2 ejected from the outlet 4b tends to flow to the top due to its buoyancy. Therefore, as the outlet 4b moves away from the bottom side, the friction reducing liquid 2 does not flow to the bottom side but flows to the top side, and the tail void 1 is less likely to have a uniform thickness along the outer periphery of the propulsion pipe 15. is there. Therefore, it is not possible to move the injection port 4a to the top side more than the traveling position of the automatic traveling vehicle M (the position of the laying rail R).

If the friction-reducing liquid 2 is to be quickly injected into the bottom of the propulsion pipe 15, the injection pipe 4 should be disposed immediately below (or in the vicinity thereof) as shown in FIG. However, in this case, the distribution pipe 5 must also be provided at the bottom position. In this case, let alone the laying of the rail R, the drain pipe H (one point in the drawing) is provided at the bottom of the propulsion pipe 15. (Indicated by the dashed line) does not remain.

Accordingly, an object of the present invention is to solve such a problem and to make it possible to drive a working vehicle in a propulsion pipe, and to apply a friction reducing liquid with a uniform thickness to a tail void on a peripheral surface. To be able to inject.

[0012]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to an injection pipe which is embedded in the inside of the pipe thickness of the above-mentioned propulsion pipe and injects a friction reducing liquid from the inside of the propulsion pipe to the tail void outside the pipe. The conduit from the injection port on the inner peripheral surface of the propulsion pipe to the outlet on the outer peripheral surface was curved.

[0013] Thus, in particular, when the pipe of the injection pipe buried at the bottom side of the propulsion pipe is curved, the injection port is provided at a position where the equipment disposed inside the propulsion pipe does not obstruct the pipe. The delivery port can be provided at a position near the lowest point where the friction reducing liquid reaches the bottom quickly before buoyancy is generated, and the friction reducing liquid is uniformly distributed on the outer peripheral surface of the propulsion pipe together with the injection pipe at the top. It can be delivered to thickness.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a cross-sectional view showing an embodiment of a propulsion pipe 15 according to the present invention. The propulsion pipe 15 is buried in a bottom portion of the propulsion pipe 15 so that the automatic traveling vehicle M can be mounted in the pipe. The pipe line (through-hole 30) of the friction reducing liquid injection pipe 40 was curved as described above, and the steel pipe injection pipe 40 was embedded in the through-hole 30 of the curved path along the curved path. The through holes 3 and 30 are for the propulsion pipe 15
It is provided at the time of manufacturing. In this embodiment, steel pipes are used as the injection pipes 4 and 40. However, any other pipes having corrosion resistance and acid resistance when buried in the ground may be used. A tube or a tube of polyvinyl chloride or the like as an inexpensive resin material may be used. Other configurations are the same as the conventional one.

By doing so, the propulsion pipe 1
Of the friction reducing liquid injection pipe 40 buried at the bottom side of the injection pipe 4
0a is a position that does not interfere with the mounting of various devices and equipment such as the laying rail R and the exhaust pipe H of the automatic traveling vehicle M,
That is, even if the delivery port 40b is provided at a position above the top of the propulsion tube 15 along the inner peripheral surface, the outlet 40b is connected to the friction reducing liquid 2
Can be provided at a position close to the lowest point such that it quickly reaches the vicinity of the bottom before the generation of buoyancy, so that the friction-reducing liquid 2 and the injection pipe 4 on the top side are quickly applied to the outer peripheral surface of the propulsion pipe 15. By injection, the tail void 1 can be made to have a uniform thickness.

In this embodiment, the injection pipe 4 on the top, which does not hinder the mounting of the automatic traveling vehicle M, is originally of a straight type as in the past, and the length of the pipe is minimized. The friction reducing liquid 2 was allowed to reach the tail void 1 quickly.

[0017]

As described above, according to the present invention, in the propulsion pipe of the semi-shield construction method, there is no problem in uniformly pressurizing and injecting the friction reducing liquid into the tail void on the outer peripheral surface. Especially on the bottom side, it is possible to provide a space for mounting various devices and equipment such as an autonomous vehicle and a drain pipe, so that these can be installed,
The workability of the worker in the pipe can be improved.

[Brief description of the drawings]

FIG. 1 is a sectional view of a propulsion pipe according to this embodiment.

FIG. 2 is a sectional view of a construction state showing a propulsion method in a semi-shield method.

FIG. 3 is a sectional view of a conventional propulsion pipe.

FIG. 4 is a sectional view of a conventional propulsion pipe.

[Explanation of symbols]

 Reference Signs List 1 gap (tail void) 2 friction reducing liquid 3, 30 through hole 4 friction reducing liquid injection pipe 4a, 40a inlet 4b, 40b outlet 5 minutes piping 6 nozzle 7 friction reducing liquid supply hose 15 propulsion pipe M automatic traveling vehicle H discharge Mud pipe

Claims (1)

[Claims] 1. A propulsion pipe of a semi-shielded construction method, wherein the propulsion pipe is embedded in the inside of the pipe thickness and injects an injectant from the propulsion pipe into a tail void outside the pipe. A semi-shielded propulsion pipe characterized in that the pipe leading to the air outlet is curved.