JPH077433Y2 - Freeze tube - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a freezing pipe used in an auxiliary construction method for underground joining work of a shield machine.

[Prior art] As a tunnel construction method, when one of the two shield machines excavated from mutually different directions reaches the joining point, the other shield machines are brought close to each other when the point is reached. Later, a construction method is adopted in which the surrounding rocks are frozen, the shield machine is dismantled, and continuous tunnels are joined underground. That is, as shown in FIG. 3 as an example, this underground joint construction method is a shield machine a that is made to excavate from a starting point of a tunnel to a required point in the ground.
Then, when the shield excavator b, which has been excavated from the end point of the tunnel, comes to the opposite position, the shield excavator b
Both shield excavators in the ground by digging while correcting the direction
After approaching a and b, as a supplementary method for stabilizing the independence of the ground c around the two shield machines a and b and completely stopping the water, both shield machines a and b A large number of freezing pipes d provided for both shield excavators a and b are radially embedded in the natural ground c around b and b to freeze the natural ground c to form frozen soil c ′. The shield machines a and b are gradually disassembled to join the tunnels e and f.

The freezing tube d used for freezing the natural ground c is the fourth
As shown in the figure, an inner pipe i is concentrically inserted from the base end of the outer pipe h into the outer pipe h whose tip is closed and sharpened, and cooled brine g supplied from the base end of the inner pipe i. The inner tube i
A double-tube freezing tube is known in which the free tube is made to flow from the distal end into the outer tube h, flowed along the inner wall of the outer tube h, and then discharged from the proximal end portion. As a method of burying the double pipe type freezing pipe d in the ground c, conventionally, there are a press-fitting method and a drilling method.

[Problems to be Solved by the Invention] However, when the conventional freezing tube d is inserted into the ground,
When burying work in the ground c by the above-mentioned press-fitting method, the basic idea is to apply a strong linear penetrating force except for very soft ground, and since there are many freezing pipes, construction work It takes a lot of time. On the other hand, when burial work is carried out in the natural ground c by the above-mentioned drilling method, the shaving by a rotating device (rotary boring, turbo drill, air hammer, etc.), impact device (percussion, water jet, etc.), turning device (auger), etc. Since the hole work is required, it takes a lot of trouble to set it up, which is a troublesome work.

Therefore, the present invention is not limited to extremely soft ground, but also to some ground that has conventionally adopted the drilling method,
It is intended to provide a freezing tube that can be buried by a press fitting method.

[Means for Solving the Problems] In order to solve the above problems, the present invention concentrically inserts an inner tube into an outer tube having a distal end closed and an opening at a proximal end,
A frozen pipe main body of a double pipe structure is constructed so that cooled brine flows out from the inner pipe into the outer pipe and flows along the inner wall of the outer pipe, and the frozen pipe main body is used as a piston rod of a hydraulic cylinder in a hydraulic cylinder. The piston is slidably pierced, and a piston is fixed to the outer peripheral portion of the cryotube body.

[Operation] Since the piston rod of the hydraulic cylinder is used as the freezing pipe body, when pressure oil is supplied to the hydraulic cylinder, the freezing pipe body integral with the piston is pushed toward the tip side while being supported by the hydraulic cylinder. It becomes possible to give a strong penetrating force to the ground for the pipe body.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention, in which an inner tube 2 is concentrically inserted from a base end of the outer tube 1 into an elongated outer tube 1 having a conical sharpened end closed. A part of the base end of the inner pipe 2 is projected to the outside from the base end of the outer pipe 1, and the brine 4 in the cooled state supplied into the inner pipe 2 from the brine inlet 3 provided at the base end of the inner pipe 2 is A frozen pipe main body 6 having a double pipe structure, which is made to flow out from the tip of the inner pipe 2 into the outer pipe 1 and flow along the inner wall of the outer pipe 1 and then discharged from a brine outlet 5 provided at the base end portion. The freezing pipe body 6 is slidably pierced through the axial center portion of the hydraulic cylinder 7 having a required length and diameter, and both end portions of the hydraulic cylinder 7 and the outer peripheral surface of the outer pipe 1 are formed. The inside of the hydraulic cylinder 7 by means of a piston 8 which is sealed with a sealing material and fixed to a required portion of the outer tube 1 of the freezing tube body 6. By dividing the two pressure chambers 7b and 7c and supplying hydraulic pressure to the pressure chambers 7b, the freezing pipe body 6 is guided by the guide cylinder portion 7a provided at the tip of the hydraulic cylinder 7 as the hydraulic cylinder 7 and the guide cylinder. While being supported by the portion 7a, it is pushed out toward the tip side to give a strong penetration force to the natural ground.

As shown in FIG. 2, the freezing pipe configured as described above is provided inside the tip portion of the shield frame 10 in the shield machine 9,
A large number of radial cylinders are arranged at required intervals in the circumferential direction. For example, the intermediate portion of the hydraulic cylinder 7 is supported by a bulkhead 12 located behind the cutter frame 11 via a mounting flange 13, and the hydraulic cylinder 7 guide cylinder part 7a
Is inserted into and supported by a through hole 14 provided at the tip of the shield frame 10, and is attached such that the tip of the freezing tube body 6 does not project outside the shield frame 10.

Under the condition that two shield machines 9 are excavating from the beginning and end of the tunnel and are stopped by being opposed to each other at a predetermined point in the ground at a predetermined interval, as shown in FIG. When freezing the natural ground 15 around the joint to perform the construction, the freezing pipe body 6 is pressed into the natural ground.
The frozen brine 4 is made to flow into the freezing tube body 6 by penetrating into the freezing tube body 6. In this case, the pressure chamber 7b of the hydraulic cylinder 7
When the pressure oil is supplied to the inside, the piston 8 is slid along the inner wall surface of the hydraulic cylinder 7, so that the freezing pipe body 6 integrated with the piston 8 is moved so as to be pushed out from the hydraulic cylinder 7. As shown by the chain double-dashed line, the ground 15 around the joint is penetrated and buried.
At this time, the freezing tube body 6 is pressed while being supported by the hydraulic cylinder 7 and its guide cylinder portion 7a, so that a strong linear penetration force is applied. Then, when the cooled brine 4 was supplied from the brine inlet 3 of the inner pipe 2 of the freezing pipe body 6, the brine 4 flowed out from the tip of the inner pipe 2 into the outer pipe 1 and flowed along the inner surface of the outer pipe 1. Since it is later discharged from the brine outlet 5 of the outer pipe 1, cold heat is transmitted to the natural ground 15 through the pipe wall of the outer pipe 1, and the natural ground 15 around the joint portion.
Are frozen and frozen soil 15a is formed.

In the above, when the freezing pipe main body 6 is buried in the natural ground 15, the freezing pipe main body 6 can be linearly given a strong penetrating force by the hydraulic cylinder 7 to be press-fitted into the natural ground 15. Not only the soft ground, but also a part of the ground that is harder than that and used to use the hole drilling method can be press-fitted by hydraulic pressure, which is necessary for drilling work. The troublesome work and labor can be omitted, and the overall time required for the freezing method can be shortened.

The present invention is not limited to the above-mentioned embodiment, and the support method of the hydraulic cylinder 7 to the shield machine may be other than the illustrated one, and various modifications may be made without departing from the scope of the present invention. Of course, it can be added.

[Effects of the Invention] As described above, according to the freezing pipe of the present invention, the freezing pipe main body that is buried in the natural ground to freeze the natural ground is incorporated as a rod of the hydraulic cylinder, and is linear by the hydraulic cylinder. Since it is possible to extrude it with a strong penetration force to press it into the natural ground, the construction time can be significantly shortened compared to the conventional press-fitting method, and the conventional drilling method has been adopted. Since it can be easily press-fitted into a part of the ground as was done previously, and the time required for conventional drilling work can be omitted, the overall time required for the freezing method can be shortened. It has an excellent effect.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the freezing tube of the present invention, and FIG.
FIG. 1 is a schematic view showing an example of a usage state of the freeze pipe of the present invention, FIG. 3 is a schematic diagram of underground joint work in tunnel construction, and FIG. 4 is a sectional view showing an example of a conventional freeze pipe. 1 ... Outer tube, 2 ... Inner tube, 4 ... Brine, 6 ... Freezing tube body,
7 ... Hydraulic cylinder, 8 ... Piston, 15 ... Ground.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Atsushi Nimura 1-25-1 Nishishinjuku, Shinjuku-ku, Tokyo Within Taisei Corporation (72) Inventor Etsuro Shioda 1-25-1 Nishishinjuku, Shinjuku-ku, Tokyo In Taisei Corporation (72) Inventor Toshiaki Uehara 13 Showa-cho, Minato-ku, Nagoya, Aichi Ishikawajima Harima Heavy Industries, Ltd.Nagoya factory (72) Hiroyuki Ito 13 Showa-cho, Minato-ku, Nagoya, Aichi Ishikawajima Harima Heavy Industries Nagoya Factory Co., Ltd. (56) Reference JP-A 63-125798 (JP, A) JP-A 54-105815 (JP, A)

Claims (1)

[Scope of utility model registration request] 1. An inner tube is concentrically inserted into an outer tube having a front end closed and an opening at a base end, and cooled brine is flown from the inner tube into the outer tube and flows along the inner wall of the outer tube. A freezing pipe body having a double pipe structure as described above, the freezing pipe body is slidably pierced through the hydraulic cylinder as a piston rod of the hydraulic cylinder, and the piston is fixed to the outer peripheral portion of the freezing pipe body. Freezing tube characterized by being.