JP2001172959A - Insert pipe, end cap, socket, and manufacturing method for insert pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply and surely prevent leakage of chemicals between step grouting areas since a packer 18 can be fixed along the outside of a packer holding member 32. SOLUTION: An insert pipe 10 comprises an outside pipe 20 and an inside pipe 22, and a hollow section 26 is formed by a plurality of partition walls 24 between the outside pipe 20 and inside pipe 22. When a tunnel is constructed, a plurality of insert pipes 10 are connected to each other through socket 28, packer holding member 32 or the like, the packer 18 is fixed to the outside of the packer holding member 32 with an adhesive tape 52, and a tube 14 is stored in the hollow section 26. Chemicals are successively grouted in the packer 18 from the tube 14 to form walls on both sides of an AGF steel pipe 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for injecting a chemical liquid into an AGF steel pipe cast in the ground, particularly in a steel pipe tip receiving method for tunnel construction (hereinafter referred to as "AGF method"). Insert tube holding tube,
The present invention relates to an end cap for closing an insert tube, a socket for connecting the insert tube, and a method for manufacturing the insert tube.

[0002]

2. Description of the Related Art An example of a conventional insert tube is disclosed in, for example, JP-A-8-13993. In this insert tube 1, as shown in FIG. 13, a plurality of grooves 2 extending in the axial direction are formed on the side wall of the main body 1a.
A tube 3 for injecting a drug solution is accommodated in the container, and a packer 4 is fixed to a predetermined position on the outer surface of the insert tube 1 using an adhesive tape 5.

At the time of tunnel construction, as shown in FIG. 13 and FIG. 14, the insert pipe 1 is inserted into an AGF steel pipe 7 cast in a ground 6 and a chemical solution (urethane foam or the like) ) To fill AGF steel pipe 7
A wall 8 (FIG. 14) is formed on both the inside and outside of the base, and a chemical solution (urethane foam, epoxy, acrylic, silica resin, or the like) is step-injected into each of the regions A, B, and C separated by the wall 8 to form a ground. Was to be consolidated.

[0004]

In the prior art, since a plurality of grooves 2 are formed on the outer surface of the insert tube 1, for example, as shown in FIG. Had a gap a. For this reason, at the time of injecting the chemical solution, there is a possibility that the chemical solution may leak between the adjacent step injection regions, and the respective regions A, B and C
There is a possibility that the required injection amount for the satisfactorily cannot be satisfied.

Therefore, conventionally, a sealing member is mounted in the gap a to seal it. However, in this case, the manufacturing cost of the sealing member and the labor for mounting are increased. There was a problem.

SUMMARY OF THE INVENTION It is, therefore, a main object of the present invention to provide an insert tube and a method for manufacturing such an insert tube, which can easily and reliably prevent leakage of a chemical solution during step injection.

It is another object of the present invention to provide an end cap and socket suitable for such an insert tube.

[0008]

A first aspect of the present invention is an insert pipe which is inserted into an AGF steel pipe cast in the ground to hold a tube for injecting a chemical solution, wherein the insert pipe has a diameter larger than the inner diameter of the AGF steel pipe. An outer tube having a small outer diameter, an inner tube disposed inside the outer tube, and a plurality of partition walls formed between the outer tube and the inner tube, wherein the tube is located in an empty space partitioned by the partition walls. The insert tube to be accommodated.

A second invention is a method of manufacturing the insert tube according to the first invention, wherein the inner tube and the partition wall are integrally formed, and the partition wall is bonded to the inner surface of the outer tube. Is the way.

A third invention is an end cap used for the insert tube of the first invention, wherein the end cap is formed on the lid to seal the outer tube and the inner tube, and the lid corresponding to the empty space. And an end cap having a punched hole.

[0011] A fourth invention is a socket for connecting the insert tube of the first invention, which has a first receiving port at one end,
A socket having a tubular main body having a second receiving port at the other end, a partition formed at the center in the axial direction of the main body, and a punched hole formed in the partition corresponding to the empty space.

[0012]

In the insert tube according to the first aspect of the present invention, a partition wall is formed between the outer tube and the inner tube, and the tube is accommodated in a space partitioned by the partition wall. One end of the insert tube is connected to one end of the packer holding member via the socket of the fourth invention, and the other end of the packer holding member is connected to another insert tube via the socket. Since the outer tube of the insert tube can be configured as a simple circular tube or the like, it can be easily connected to the socket socket. Then, a required number of insert tubes are connected, and the end cap of the third invention is attached to the tip of the insert tube.
When the tube is passed through the socket and the end cap, a punch hole is punched.

The packer holding member has a hole through which a chemical solution passes and holds the packer, and is formed, for example, by forming a hole in the side wall of a simple circular tube. Therefore, the packer can be fixed along the outer surface of the packer holding member, that is, a smooth surface without irregularities (such as grooves), and it is possible to prevent a gap from being formed between the packer and the outer surface of the packer holding member.

[0014]

According to the present invention, the leakage of the chemical solution between the step injection regions can be inexpensively and simply and reliably prevented.

The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the accompanying drawings.

[0016]

1 shows an insert tube 10 of this embodiment shown in FIG.
For example, as shown in FIG. 2, a tube 14 is inserted into an AGF steel tube 12 and held therein, and is formed of a synthetic resin such as vinyl chloride.

Here, the AGF steel pipe 12 has a unit length of about 2.0 to 4.0 m, and is put into the ground 16 by adding a plurality of the pipes. A plurality of holes 12a are formed over the entire surface, and a portion corresponding to a packer 18 described later includes:
A hole 12b larger than the hole 12a is formed. However, depending on the size and number of the holes 12a, the holes 12b may not be necessary.

The insert tube 10 (FIG. 1) includes an outer tube 20 having an outer diameter smaller than the inner diameter of the AGF steel tube 12 and an inner tube 22 disposed inside the outer tube 20. A plurality (six in this embodiment) of partition walls 24 are radially formed between the two. Thereby, the outer tube 20
A plurality of (six in this embodiment) cavities 26 are obtained between the inner tube 22 and the inner tube 22. The cross-sectional area of the inner tube 22 and each cavity 26 is such that the tube 14 can be accommodated.
Is set sufficiently larger than the cross-sectional area of.

In manufacturing the insert tube 10, the whole may be integrally formed by extrusion using a mold suitable for the cross-sectional shape of the insert tube 10, or for example, as shown in FIG. And the partition walls 24 may be integrally molded and inserted into the outer tube 20 for bonding.
Further, in the latter case, a valley 24a (FIG. 3) extending in the axial direction is formed at the tip of each partition wall 24.
a may be adhered to the inner surface of the outer tube 20 with a filling-type vinyl chloride adhesive or the like. When the valley 24a is formed,
The adhesive stored in the valleys can be prevented from escaping, and the peaks are appropriately melted by the adhesive, so that the bonding efficiency can be improved.

In the AGF method using the insert tubes 10, as shown in FIG. 4, a plurality of insert tubes 10 are connected via a socket 28, an injection tube 30 and a packer holding member 32, and the first insert tube 10 The end cap 34 is attached to the tip, and the packer 18 is attached to the outer surface of the packer holding member 32. Then, tubes 14 having different lengths are accommodated in the respective empty portions 26 of the insert tube 10, and the distal end of the tube 14 is positioned inside the injection tube 30 or the packer holding member 32.

As shown in FIG. 5, the socket 28 includes a short tubular body 38 having a first receiving port 36a at one end and a second receiving port 36b at the other end. The partition 40 is formed. A punching hole 44 is formed at a position corresponding to the empty space 26 in the partition wall 40 by a cut 42 having a substantially rectangular cross section. Then, the insert tube 10 or the packer holding member 32 is bonded to each of the first receiving port 36a and the second receiving port 36b.

The punching hole 44 when not in use is closed by a lid 44a. In use, the punching hole 44 is opened by punching out the lid 44a. However, the shape of the cut 42 is not limited to a substantially rectangular shape as shown in FIG. For example, when punching only from one surface side of the partition wall 40, as shown in FIG. 6, the cut 42 may be formed to be inclined in a certain direction with respect to the center axis of the punched hole 44.

As shown in FIG. 7, the end cap 34 has a socket 28 (see FIG.
And FIG. 6). That is, the socket 36a
A cover 46 corresponding to the partition wall 40 is formed in the inner part of the cover 46, and a punched hole 44 is formed at a position corresponding to the space 26 in the cover 46. Then, the insert tube 10 or the packer holding member 32 is bonded to the receiving port 36a.

Injection tube 30 and packer holding member 32
Includes a tubular main body 48 having the same size as the outer tube 20 of the insert tube 10 as shown in FIG.
A plurality of holes 50 are formed in the side wall of the main body 48 for passing a chemical solution.

The packer 18 is made of a material having elasticity and liquid permeability such as cotton, for example, and has a cylindrical shape along the outer surface of the packer holding member 32 as shown in FIGS. 9 and 10A. It is formed in a shape. Then, the packer 18 is mounted on the outer surface of the packer holding member 32 and fixed with the adhesive tape 52.

At the time of tunnel construction by the AGF method, as shown in FIG. 2, the insert tube 10 shown in FIG. Deploy. Then, a chemical pressure pump is connected to the tube 14 for the packer, and the inside of the packer holding member 32 is filled with a chemical such as urethane foam. Then, the chemical solution is filled into the inside of the packer 18 through the hole 50 of the packer holding member 32, and the packer 18 is pushed by the chemical solution, and the AGF steel pipe 12 is pressed.
Adhered to the inner surface of the Further, this chemical liquid exudes from the packer 18 and the holes 12a and 12b of the AGF steel pipe 12 are formed.
From the ground 16. By this work, AGF
Walls made of a chemical solution (urethane foam, etc.) are formed on both the inside and outside of the steel pipe 12, and the ground 1
6 is divided into three areas A, B and C. Region A,
After the formation of B and C, a chemical solution (urethane foam, epoxy, acrylic, silica resin, etc.) is step-injected from the step injection tube 14 corresponding to each region, and the ground 16 is consolidated.

When mortar is injected into the region C, the mortar tube 14 is inserted into the inner tube 22 of the insert tube 10.
Is inserted through the end cap 34, while the air vent tube 14 is inserted into one of the cavities 26 and is projected from the end cap 34. Then, mortar is injected while the air in the region C is being removed.

According to this embodiment, the packer holding member 3
2 can be configured as a simple circular tube, so that the packer 18 can be fixed along the outer surface of the packer holding member 32, that is, a smooth surface without irregularities (such as grooves) (FIG. 10A). . Therefore, leakage of the chemical solution between the step injection regions A, B, and C can be easily and reliably prevented.

In the above embodiment, the insert tube 1
0 is connected to the injection pipe 30 (FIGS. 4 and 8) to inject the drug solution from the hole 50 of the injection pipe 30 into the ground 16. However, a hole is formed in the outer pipe 20 of the insert pipe 10. A chemical solution may be injected from the hole into the ground 16. In this case, there is no need to connect the injection tube 30, so that the structure can be further simplified.

In the above-described embodiment, the packer holding member 32 and the insert tube 10 are connected via the socket 28 (FIG. 9). For example, as shown in FIG. The partition wall 40 and the receiving port 56 are integrally formed in the receiving port 54a.
0 may be connected.

As shown in FIG. 12, a packer supporting portion 60 is formed on each of the two end caps 58, and these end caps 58 are connected by a connecting pipe 62.
Further, the packer 18 is fixed to the packer supporting portion 60, and the insert pipe 10 is attached to the end cap 58 and the connecting pipe 62.
May be connected to the outer tube 20 and the inner tube 22, respectively.

[Brief description of the drawings]

FIG. 1 is an illustrative view showing an insert tube according to an embodiment of the present invention;

FIG. 2 is an illustrative view showing a use state of the insert pipe;

FIG. 3 is an illustrative view showing a method for manufacturing an insert pipe;

FIG. 4 is an illustrative view showing a state where a plurality of insert tubes are connected;

FIG. 5 is an illustrative view showing a socket;

FIG. 6 is an illustrative view showing a modified example of a socket;

FIG. 7 is an illustrative view showing an end cap;

FIG. 8 is an illustrative view showing an injection tube and a packer holding member;

FIG. 9 is an illustrative view showing a state where the packer is mounted on the packer holding member;

FIG. 10 is a sectional view taken along line XA-XA and XB-XB in FIG. 9;

FIG. 11 is an illustrative view showing a modified example of the packer holding member;

FIG. 12 is an illustrative view showing a modified example of the packer holding member;

FIG. 13 is an illustrative view showing a conventional technique;

FIG. 14 is an illustrative view showing an AGF method;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Insert pipe 12 ... AGF steel pipe 14 ... Tube 16 ... Ground pile 18 ... Packer 20 ... Outer pipe 22 ... Inner pipe 24 ... Partition wall 26 ... Empty space 28 ... Socket 30 ... Injection pipe 32 ... Packer holding member 34 ... End cap

 ──────────────────────────────────────────────────続 き Continued on the front page (71) Applicant 500002836 Kubota Plastic Pipe Construction Co., Ltd. 1-2-47, Shishitsuhigashi, Naniwa-ku, Osaka-shi (71) Applicant 598006646 Sasaki Giken Co., Ltd. 25 Tamatecho, Kashiwara-shi, Osaka No. 32 (72) Inventor Saburo Kadowaki 1-2-47 Shikitsu Higashi, Naniwa-ku, Osaka City Inside Kubota Corporation (72) Inventor Tokio Tsurugame 1-4-5 Awajicho, Chuo-ku, Osaka-shi Sanken Inside Trading Co., Ltd. (72) Inventor Tatsuo Miura 270 Nakanocho, Kosai-cho, Kosai-cho, Koka-gun, Shiga Prefecture Inside Kubota Concrete Co., Ltd. (72) Shingo Takahira 1-2-47 Shikitsuhigashi, Namiwa-ku, Osaka-shi Kubota Plastic Pipe Construction Co., Ltd. (72) Inventor Shinsuke Sasaki 2-6-22 Kokubunishi, Kashiwara-shi, Osaka Sasaki Giken FTA None (reference) 2D040 AB01 BB09 CA10 CB03 DA01 DA02 DA05 DA12 DA13 DC02 2D054 FA02

Claims (6)

[Claims] An outer tube having an outer diameter smaller than the inner diameter of the AGF steel tube, the insert tube being inserted into an AGF steel tube cast in the ground to hold a tube for injecting a chemical solution. An inner pipe disposed inside the outer pipe, and a plurality of partition walls formed between the outer pipe and the inner pipe, wherein the tube is housed in an empty space partitioned by the partition wall, Insert tube. 2. The method for manufacturing an insert pipe according to claim 1, wherein the inner pipe and the partition wall are integrally formed, and the partition wall is bonded to an inner surface of the outer pipe. Method. 3. The end cap used for the insert tube according to claim 1, wherein the cover is formed on the lid corresponding to the outer tube and the inner tube, and the lid corresponding to the empty space. End cap with a punched hole. 4. The end cap according to claim 3, further comprising a punched hole formed in said lid corresponding to said inner tube. 5. A socket for connecting an insert tube according to claim 1, wherein the tubular body has a first receiving port at one end and a second receiving port at the other end. A socket comprising: a partition formed; and a punched hole formed in the partition corresponding to the space. 6. The socket according to claim 5, further comprising a punched hole formed in said partition wall corresponding to said inner tube.