JP2001193049A - Chemical grouting packer unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To promote execution efficiency capable of simply and surely preventing the leakage of chemicals between step grouting areas and, etc. SOLUTION: When a tunnel is constructed, insert pipes 14 are connected to socket inlets of sockets 30 and 32 constituting a chemical grouting packer unit 10, and the insert pipes 14, packer unit 10 and, etc., are inserted into an AGF steel pipe. A packer 36 constituting the packer unit 10 is filled with the chemicals to form a partition wall. Accordingly, even if there are unevennesses in the outsides of the insert pipes 14, the leakage of the chemicals from the unevennesses is no cause for worry.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packer unit for injecting a chemical solution, and more particularly, to an AGF steel pipe cast in a ground in a steel pipe tip receiving method (hereinafter referred to as "AGF method") for tunnel construction. The present invention relates to a drug solution injection packer that is arranged to form a partition wall that partitions a drug solution injection region.

[0002]

2. Description of the Related Art In a conventional AGF method, as shown in FIG.
Was mounted directly on the outer surface of the. Then, at the time of tunnel construction, as shown in FIGS. 13 and 14, the insert pipe 2 is inserted into the AGF steel pipe 5 cast into the ground 4 and the tube 1 is filled with a chemical solution (urethane foam or the like) from the tube 1. By doing so, partition walls 6 (FIG. 14) are formed on the inner and outer sides of the AGF steel pipe 5, and thereafter, the partition walls 6 are formed.
The chemical solution is step-injected into each of the regions A, B and C partitioned by the above, so that the ground 4 is solidified.

[0003]

Conventionally, since the cylindrical packer 3 is directly mounted on the outer surface of the insert tube 2, if the outer surface of the insert tube 2 has irregularities, for example, FIG. As shown in FIG. 5, a gap a was formed between the insert tube 2 and the packer 3. Therefore, the gap a
In order to prevent the leakage of the chemical solution, there is a problem that the workability is poor.

SUMMARY OF THE INVENTION Accordingly, it is a primary object of the present invention to provide a packer unit for injecting a chemical solution, which can easily and reliably prevent leakage of a chemical solution and improve workability.

[0005]

SUMMARY OF THE INVENTION According to the present invention, there are provided a first port and a second port for receiving an insert tube, and a first port and a second port.
A pipe provided between the receiving port and a packer attached to cover the pipe, the packer is filled with a chemical solution,
This is a packer unit for injecting a chemical.

[0006]

When the tunnel is constructed, the insert pipe is connected to the first port and the second port of the packer unit for injecting a chemical solution, and the insert pipe and the packer unit are inserted into the AGF steel pipe. Then, a chemical solution is filled in the packer constituting the packer unit, and partition walls are formed on both the inner and outer sides of the AGF steel pipe. Therefore, even when the outer surface of the insert tube has irregularities, there is no fear that the chemical solution leaks from the irregularities, and it is not necessary to attach a sealing member as in the related art.

[0007]

According to the present invention, the leakage of the chemical solution between the step injection regions and the like can be easily and reliably prevented, so that the workability can be improved.

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

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A chemical solution injecting packer unit 10 according to this embodiment shown in FIGS. 1 and 2 has, for example, an insert tube 14 inserted into an AGF steel tube 12 as shown in FIG.
To form a partition wall 16 which partitions the chemical solution injection areas A, B and C.

Here, the AGF steel pipe 12 has a unit length of about 2.0 to 4.0 m and is piled on the ground 18 while adding a plurality of the pipes.
As shown in (B), a plurality of holes 12a for injecting a chemical solution are formed over the entire surface, and a hole 12b larger than the hole 12a is formed at a position corresponding to the packer unit 10.

The insert tube 14 is made of a synthetic resin such as vinyl chloride, for example, and as shown in FIG.
It includes an outer tube 20 having an outer diameter smaller than the inner diameter of the F steel tube 12 and an inner tube 22 arranged inside the outer tube 20. A plurality of (six in this embodiment) walls 24 are formed radially between the outer tube 20 and the inner tube 22, whereby
A plurality (six in this embodiment) of voids 26 are formed.
The cross-sectional area of the inner space of the inner tube 22 and each of the empty portions 26 is set to be sufficiently larger than the cross-sectional area of the chemical solution injection tube 28 accommodated therein.

As shown in FIG. 1, the packer unit 10 includes a first socket 30, a second socket 32, and a connecting pipe 34.
And a packer 36.

The first socket 30, as shown in FIG.
It includes a short tubular body 38 having a receiving port 38a at one end and a receiving port 38b at the other end, and the back or body 38 of each receiving port.
A partition wall 40 is formed at the central portion in the axial direction of. And
In the partition wall 40, a punch hole 44 is formed at a position corresponding to the inner tube 22 and each space 26 of the insert tube 14 by a cut 42 having a substantially elliptical cross section. The punching hole 44 when not in use is closed by a lid 46, and the punching hole 44 is punched out when the lid 46 is used in use.
Is opened. The second socket 32 is connected to the first socket 30.
Since it is formed in the same manner as described above, its description is omitted.

As shown in FIG. 4, the connecting pipe 34 includes a tubular main body 48 having the same diameter as the outer pipe 20 in the insert pipe 14 (FIG. 1).
A plurality of holes 50 for passing a chemical solution are formed.

The packer 36 is formed in a tubular shape along the outer surface of the connecting pipe 34 (FIG. 1) by a woven cloth (cotton woven cloth, hemp woven cloth or polyester woven cloth) having elasticity and liquid permeability. You. Here, the liquid-permeability means a function of exuding the chemical solution, and when focusing on the structure, means having a hole for exuding the chemical solution. In the case of a woven fabric, a mesh-like hole is formed by the yarns arranged vertically and horizontally, and the chemical solution exudes from this hole.

The socket 38a of the first socket 30 is connected to one end of the connecting pipe 34, the socket 38a of the second socket 32 is connected to the other end of the connecting pipe 34, and the packer 36 is connected to the outer surface of the connecting pipe 34. Adhesive tape 52 (FIG. 1)
Fixed at.

At the time of tunnel construction using the packer unit 10, first, as shown in FIG. 5, a plurality of insert pipes 14 are connected via the packer unit 10, the socket 54 and the injection pipe 56, and the first insert pipe 14 is connected. The end cap 58 is attached to the tip of the. Then, tubes 28 having different lengths are accommodated in the respective empty portions 26 of the insert tube 14, and the distal end of each tube 28 is positioned inside the packer unit 10 or the injection tube 56. The same socket as the first socket 30 and the second socket 32 described above can be used as the socket 54.
The same as the above-described connecting pipe 34 can be used.

Then, as shown in FIG. 6, an integrated body (FIG. 5) including the insert tube 14 and the packer unit 10 is inserted into the AGF steel tube 12, and the packer unit 1 is inserted.
0 is arranged at a position corresponding to the hole 12b. Then, a chemical solution pump is connected to the tube 28 for the packer, and the connecting tube 34 (FIG. 1) of the packer unit 10 is filled with a chemical solution such as urethane foam. Then, this chemical solution is connected to the connecting pipe 34.
The packer 36 is filled from the inside through the hole 50, and the packer 36 is pressed by the chemical solution and is brought into close contact with the inner surface of the AGF steel pipe 12. When the pressure inside the packer 36 increases, the chemical liquid seeps out of the packer 36 and is injected into the ground 18 through the holes 12a and 12b of the AGF steel pipe 12. As a result of this operation, partition walls 16 made of a chemical solution (such as urethane foam) are formed on both the inside and outside of the AGF steel pipe 12, and the ground 18 is divided into three regions A, B, and C in the longitudinal direction of the AGF steel pipe 12. Then, step injection tubes 2 corresponding to the respective regions A, B and C
From step 8, a chemical solution (urethane foam, epoxy, acrylic, silica resin, etc.) is injected stepwise to consolidate the ground 18.

According to this embodiment, since the chemical solution is injected into the ground 18 from the packer 36 mounted on the outer surface of the connecting pipe 34, there is no fear that the chemical solution leaks from the outer surface of the insert pipe 14. That is, regardless of the outer surface shape of the insert tube 14, leakage of the chemical solution can be easily and reliably prevented. Therefore, workability can be improved.

In the above-described embodiment, the small-diameter hole 50 is formed in the main body 48 of the connecting pipe 34 constituting the packer unit 10.
Although FIG. 4 is formed, a long hole 54 may be formed in the main body 48 as shown in FIG.
As shown in (B), the inner tube 56 and the wall 58 may be formed together with the long hole 54. When the long hole 54 is formed, the tube 28 passed through the long hole 54 into the connection pipe 34 can be touched, so that the workability of inserting the tube 28 can be improved.

As shown in FIG. 8, the connecting tube 34 and the two receiving ports 38b may be integrally formed by injection molding or the like, or as shown in FIG.
May be connected by using a connection pipe 60 penetrating through the center of the partition wall 40. As shown in FIG. 10, a packer supporting portion 62 is formed on the partition wall 40 at the back of the receiving port 38b, and the partition walls 40 are connected to each other by a connecting pipe 60, and both end portions of the packer 36 are connected to each packer supporting portion 62. May be supported.
The connecting pipe 60 (FIGS. 9 and 10) is inserted into the inner pipe 22 (FIG. 6B) of the insert pipe 14 to function as a joint.

Further, each of the above-described embodiments (FIGS. 1, 8,
Instead of the packer 36 in FIGS. 9 and 10), FIG.
Alternatively, a packer 64 as shown in FIG. 12 may be used.

The packer 64 (FIG. 11) is a bag-shaped main body 6 made of a woven cloth (such as a cotton woven cloth) having elasticity and liquid permeability.
6 inclusive. The main body 66 is formed in a tubular shape having an inner diameter substantially the same as the outer diameter of the connecting pipe 34 so that the main body 66 can be disposed on the outer surface of the connecting pipe 34. Therefore, inside the main body 66, a cylindrical closed space 68 that can expand and contract is formed by the inner wall 66 a and the outer wall 66 b. A hole 70 is formed in the inner wall 66a at the axial center of the main body 66.
The main body 66 is formed by arranging a cylindrical inner wall 66a inside a cylindrical outer wall 66b and sewing both ends thereof.

Packer unit 7 using packer 64
In FIG. 2, as shown in FIG. 12, the long holes 54 (FIG. 7A,
(B)) is used.
The packer 64 is mounted on the outer surface of the fourth. One end of a hose 74 is connected to the hole 70 of the packer by bonding or the like, and a connecting member 76 such as a nipple is attached to the other end of the hose 74. Then, the connection member 76 is connected to the tube 28. When connecting the hose 74 and the tube 28, the hose 74 is pulled out from the punched hole 44 of the partition wall 40, and the connection operation is performed outside the connecting pipe 34.

As the material for forming the packers 36 and 64, in addition to the woven fabric described above, any material having elasticity and liquid permeability can be used. For example, rubber sheet and vinyl sheet (including foamed vinyl sheet)
As long as it has elasticity such as that described above, it can be used by forming micropores through which a chemical solution is passed to impart liquid permeability. When a packer is formed using a rubber sheet, a large number of holes through which a chemical solution is passed are formed in a vulcanized main body, for example, formed in a tire tube shape by pressing.

[Brief description of the drawings]

FIG. 1 is an illustrative view showing a packer unit for injecting a chemical solution according to an embodiment of the present invention;

FIG. 2 is a sectional view of FIG.

FIG. 3 is an illustrative view showing a socket;

FIG. 4 is a perspective view showing a connecting pipe.

FIG. 5 is an illustrative view showing a unitary structure such as an insert tube and a packer unit;

FIG. 6 is an illustrative view showing a use state of the embodiment in FIG. 1;

FIG. 7 is a perspective view showing a modification of the connecting pipe.

FIG. 8 is an illustrative view showing another embodiment;

FIG. 9 is an illustrative view showing another embodiment;

FIG. 10 is an illustrative view showing another embodiment;

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

FIG. 12 is an illustrative view showing another embodiment;

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

FIG. 14 is an illustrative view showing a conventional technique;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Packer unit for liquid injection 12 ... AGF steel pipe 14 ... Insert pipe 18 ... Ground mountain 20 ... Outer pipe 22 ... Inner pipe 26 ... Empty part 28 ... Tube for chemical liquid injection 30, 32 ... Socket 34 ... Connection pipe 36 ... Packer

 ──────────────────────────────────────────────────続 き Continuation of the front page (71) Applicant 500002836 Kubota Plastic Pipe Construction Co., Ltd. 1-2-47, Shikitsuhigashi, Naniwa-ku, Osaka-shi (71) Applicant 594169400 Sanken Trading Co., Ltd. 1 Awajicho, Chuo-ku, Osaka-shi 4-5, Chome (72) Inventor Saburo Kadowaki 1-2-47, Shikitsuhigashi, Namiwa-ku, Osaka City, Japan Inside Kubota Co., Ltd. Kubota Concrete Co., Ltd. (72) Inventor Shinsuke Sasaki 2-6-22 Kokubu Nishi, Kashiwara-shi, Osaka Sasaki Giken Co., Ltd. (72) Inventor Shingo Takahira 1-2-47 Shikitsuhigashi, Namiwa-ku, Osaka-shi No. Kubota Plastic Pipe Construction Co., Ltd. (72) Inventor Tokio Tsurugame 1-4-5 Awajicho, Chuo-ku, Osaka-shi Sanken Trading Co., Ltd. F term (reference) 2D040 AB01 BB09 CB03 DA01 DA03 DA11 DC02

Claims (5)

[Claims] 1. A first port and a second port for receiving an insert pipe, a pipe provided between the first port and the second port, and mounted to cover the pipe. A packer unit for injecting a chemical, comprising a packer, wherein the packer is filled with a chemical. 2. The first socket is constituted by a first socket having a third socket, and the second socket is constituted by a second socket having a fourth socket. The packer unit for injecting a drug solution according to claim 1, wherein one end of the tube is connected, and the other end of the tube is connected to the fourth receptacle. 3. The packer unit according to claim 1, wherein the pipe has a hole through which a chemical solution passes, and the packer is filled with the chemical solution through the hole from inside the pipe. 4. A partition formed at a deep portion of each of the first port and the second port, and a packer support formed at each of the partitions, wherein the partitions are connected by the pipe. The packer unit for injecting a drug solution according to claim 1, wherein the packer unit is connected and the packer is supported by the packer support. 5. The packer unit according to claim 1, wherein said packer includes a bag-shaped main body having a hole through which a chemical solution exudes and constituting a closed space.