JP2002013688A - Gas cut-off device and gas cut-off method using the device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas cut-off device, capable of eliminating troublesome character of a work and to provide a gas cut-off method using the device. SOLUTION: A gas cut-off device is operated during repair of existing line P; an expandable and shrinkable bag is introduced in the end part of the spot to be repaired of the line P; and the bag is expanded to cutoff a flow of gas. A bag insertion device 1, comprising a base part 3A having a peripheral wall 3A formed of a transparent substance; a bag insertion part 3B formed integrally in a position facing the peripheral wall 3A and communicating with the interior of the base part 3A; and a gas dispersion part 3C extending from the interior of the base part 3A toward the outside and provided at an end part on the external side with an on-off valve 7 is situated on a pedestal 2, in correspondence to a communication hole formed in a position where a bag is inserted in the line P.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas shut-off device and a gas shut-off method using the same.
The present invention relates to an insertion device for inserting a gas flowing through a pipeline into a bag and to an insertion method using the same.

[0002]

2. Description of the Related Art Conventionally, as an example of a method for repairing a gas pipeline laid underground, a method as shown in FIG. 5 is performed. First, a work pit is formed by excavating the area around a repair target location where a leak or the like has occurred. Next, a communication hole B for introducing the airbag A into the pipeline L is opened on the upstream side and the downstream side of the repair target location X, and the airbag A is contracted from the communication hole B in the pipeline. After the introduction is completed, the airbag A is inflated in the pipeline to cut off the gas flow. A communication hole D for forming a bypass pipe C is formed outside the position of the airbag A,
The communication hole D is connected by a bypass pipe C, and after the supply of gas is secured, repair work is performed.

In order to form a communication hole for inserting the airbag A into the conduit, a position where the communication hole is formed in the conduit is pierced by a punch, and after piercing, the communication hole is sealed with a plug stopper or the like. A bag insertion device for inserting the airbag after stopping is installed on the outer peripheral surface of the pipeline. In addition to the above-mentioned drilling work, it is necessary to perform the work of removing the chips that have fallen into the pipeline after the drilling while preventing the gas from flowing out of the pipeline. A work bag made of a transparent resin such as vinyl is attached, and perforation work and chip removal work are performed in the work bag. On the other hand, when inserting the airbag A into the pipeline,
After the bag insertion device is mounted on the outer peripheral surface of the pipeline and the plug is removed, the bag is inserted into the pipeline via the bag insertion device.

[0004]

However, the conventional construction method described above has a disadvantage that the operation in the work bag is complicated.
That is, when a work bag is used, the bag insertion device is mounted in a state where the communication hole after perforation is sealed, and the work bag is mounted again to prevent gas leakage when the bag is inserted. Required, and the work procedure becomes complicated. Moreover, when the bag is inserted, it flows out between the juxtaposed positions of the bag in addition to the pipe for the air passage to the bag for blocking.
In some cases, a so-called diffusion pipe for dispersing the overgas to the outside of the pipeline may be provided.In this case, a plurality of pipes for the passage are provided in the work bag in addition to the tool for extracting the plug plug. However, if the volume of the work bag is small, this requirement cannot be satisfied, and an operation of replacing the work bag for each process is required.

[0005] An object of the present invention is to provide a gas shut-off device and a gas shut-off method using the gas shut-off device which can eliminate the complexity of work in view of the problems in the conventional gas shut-off method.

[0006]

In order to achieve this object, according to the first aspect of the present invention, when repairing an existing pipeline,
A gas shut-off device for introducing an inflatable / contractible bag at an end of a repair target portion of the pipeline, inflating the bag and shutting off gas flow, wherein the bag is inserted into the pipeline at a position where the bag is inserted. A base having a peripheral wall made of a transparent body integrated on the pedestal corresponding to the formed communication hole, and a bag insertion portion integrated at a position facing the peripheral wall and communicating with the base,
It is characterized in that a bag insertion device is provided which includes a gas diffusion portion which is extended from the inside of the base to the outside and has an opening / closing valve provided at an end on the outside side.

According to the second aspect of the present invention, when repairing an existing pipeline, an inflatable / contractible bag is introduced into an end of a repair target portion of the pipeline, and the bag is inflated to distribute gas. A base part having a peripheral wall made of a transparent body integrated on a pedestal corresponding to a communication hole formed at a bag insertion position in the pipe, and A bag insertion part which is integrated at a position facing directly and communicates with the inside of the base, and a gas diffusion part extended from inside the base to the outside and provided with an on-off valve at an external end. Prepare an insertion device, after completion of the sealing of the communication hole performed after drilling the communication hole, attach the bag insertion device to a conduit corresponding to the communication hole, and use the bag insertion device for the sealing in the bag insertion device Remove plug plugs, insert bags and flow between bags It is characterized by performing for gas dissipation work, respectively.

The invention according to claim 3 is characterized in that the bag insertion device is provided with a plug plug removal tool inserted therein.

[0009]

According to the first to third aspects of the present invention, by attaching the bag insertion device to the conduit after the formation of the communication hole, all the operations after the formation of the communication hole can be performed inside the bag insertion device. In particular, when inserting the bag after the formation of the communication hole, the removal of the plug stopper sealing the communication hole, the insertion of the bag, and the gas flowing out between the bags inserted into the pipeline, the so-called overflow Since the gas dissipating work can be performed at the same place, that is, at the base of the bag insertion device, there is no need to replace a member for shutting off gas, that is, a so-called working bag, for each work.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic external view for explaining the configuration of a bag insertion device used in a gas shut-off device according to an embodiment of the present invention. In FIG. 1, a bag insertion device 1 is used for inserting a bag in a pipeline P. The pedestal 2 includes a pedestal 2 seated at a position corresponding to the formed communication hole, and a base 3 provided on the pedestal 1. The detailed configuration of the bag insertion device 1 is shown in FIG. In FIG. 2, the pedestal 2 is provided with locking portions 2A that project in the radial direction of the pipeline P, and a chain 4 hung between the locking portions 2A is hung around the outer peripheral surface of the pipeline P to form a pipe. Mounted on road P.

A base 3 is integrated on the upper surface of the pedestal 2, and the base 3 has a cylindrical peripheral wall 3A made of a transparent material using acrylic acid resin or the like. The upper surface of the cylindrical peripheral wall 3A is open, and the inside of the base 3 can be sealed by being closed by the lid member 5. Cylindrical peripheral wall 3
As shown in FIGS. 1 and 3, a bag formed of a cylindrical member having one end communicating with the inside of the base 3 and the other end extending diagonally upward, as shown in FIGS. An insertion portion 3B is provided, and the bag insertion portion 3B is provided.
Is closed by the lid member 6 when the bag is not inserted. At a position perpendicular to the position of the bag insertion portion 3B on the cylindrical peripheral wall 3A, as shown in FIGS. 1 and 2, there is another end extending in the radial direction of the base 3 from one end communicating with the internal space of the base 3. Gas dispersing part 3 composed of pipe
C (see FIGS. 1 and 4) is provided, and a cock 6 as an on-off valve is attached to the other end opening. Cook 6
Can set the state of communication between the internal space of the base 3 and the outside according to the opening and closing operation, and when opened, the gas accumulated in the internal space of the base 3 can be diffused to the outside. .

On the other hand, a cover member 3 for closing the upper surface of the cylindrical peripheral wall 3A
C has a box wrench 8 composed of a magnet which is a tool for extracting and attaching a plug plug for sealing a communication hole formed in the conduit P, and a bag guiding tool 9 (see FIG. 2). ) Are arranged such that one end thereof is located inside the base portion 3, and the cylindrical peripheral wall 3 is provided.
When the upper surface of A is closed, one end of each of the above tools is
The internal space of the base 3 is sealed in a state where the internal space is located within the internal space.

In this embodiment, the following procedure can be executed by using the bag insertion device 1 having the above-described configuration. (1) Drill a communication hole at a required position on the upstream and downstream sides of the cutoff point. In this work, the work bag is attached to the pedestal of the drilling machine as in the past, and after the drilling, the chips that have fallen into the pipeline with the chip removal tool such as a magnet previously inserted into the work bag. Is removed. (2) Sealing the communication hole In this work, the communication hole is sealed with a plug stopper provided in the work bag.

(3) Bag Insertion Operation This operation is a characteristic operation of the present embodiment, and the bag insertion device 1 is mounted on the pipe corresponding to the communication A sealed by the plug stopper. , The bag is inserted. The bag insertion device 1 includes a bag insertion portion 3B and a gas diffusion portion 3C located on the cylindrical peripheral wall 3A of the base 3, and a plug stopper removal tool 8 and a bag guiding tool 9 provided on the lid member 5. Are arranged in advance, so that it is not necessary to replace the work bag as in the related art after the bag insertion device 1 is mounted. At the time of the bag insertion operation, first, the plug stopper sealing the communication hole is extracted using the extraction tool 8 provided on the lid member 5 of the bag insertion device 1.
Next, the cover member 6 of the bag insertion portion 3B is removed, and a bag (not shown) is inserted. When the bag is inserted, the tip of the bag in the insertion direction is directed toward the communication hole using the bag guiding tool 9, so that the bag can be easily inserted into the communication hole. Especially the cylindrical peripheral wall 3 of the base 3
Since A is a transparent body, the insertion position of the bag can be confirmed from the outside, and the operation of inserting the bag can be facilitated.

(4) Dispersion of gas overflow This operation is performed when the bag inserted into the pipeline is inflated and it is confirmed that the bag is in close contact with the inner surface of the pipeline at a predetermined pressure, and flows out between the bags. It is assumed that the overgas enters the base 3 of the bag insertion device 1 through the communication hole, and the overgas that has flowed out of the base 3 is diffused to the outside of the pipeline by the gas diffusion unit 3C, that is, the so-called atmosphere. Dissipate. In this case, this is performed by connecting a hose extended toward the gas diffusion section to the gas diffusion section 3C and opening the cock 7.

On the other hand, to release the cutoff in the pipeline, the bag inserted into the pipeline through the bag insertion device 1 is contracted, pulled out through the bag insertion portion 3B, and then removed. The plug is attached to the communication hole using the tool 8. When this operation is completed, the bug insertion device 1 is removed from the pipeline P.

According to the above-described embodiment, since the tools and necessary components according to the work content are provided in the bag insertion device 1 in advance, it is not necessary to expose the communication hole for each work content. Therefore, there is no need to replace the bag so as to expose the communication hole, so that the operation time can be reduced.

[0018]

According to the first to third aspects of the present invention, the work after the formation of the communication hole can be performed inside the bag insertion device by mounting the bag insertion device in the pipeline after the formation of the communication hole. In particular, when inserting the bag after the formation of the communication hole, the removal of the plug stopper sealing the communication hole, the insertion of the bag, and the gas flowing out between the bags inserted into the pipeline, the so-called overflow Since the gas dissipating work can be performed at the same place, that is, at the base of the bag insertion device, there is no need to replace a member for shutting off gas, that is, a so-called working bag, for each work. As a result, it is possible to improve the working efficiency by eliminating the complexity of the work by Katsuki Katsuki.

[Brief description of the drawings]

FIG. 1 is a schematic external view illustrating a configuration of a bag insertion device used in a gas shut-off device according to an embodiment of the present invention.

FIG. 2 is a partial cross-sectional view of the bag insertion device shown in FIG.

FIG. 3 is a partial cross-sectional view of a bag insertion device shown in FIG.

FIG. 4 is a plan view for explaining details of the bag insertion device shown in FIG. 1;

FIG. 5 is a schematic view for explaining a conventional gas shutoff method.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Bag insertion device 2 Pedestal 3 Base 3A Cylindrical peripheral wall 3B Bag insertion part 3C Gas diffusion part 5, 6 Lid member 7 On-off valve 8 Socket wrench which is a plug plug removal tool 9 Bag guiding tool P Pipe line

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Takeshi Kancho 1-8-10 Jinnan, Shibuya-ku, Tokyo Inside Kyowa Kenko Kogyo Co., Ltd. No. 6 Inside Oogai Seimitsu Co., Ltd. (72) Inventor Toshihide Nabuchi 1-5-20 Kaigan, Minato-ku, Tokyo Tokyo Gas Co., Ltd. (72) Inventor Masahiro Ito 1-5-20 Kaigan, Minato-ku, Tokyo No. Tokyo Gas Co., Ltd. F-term (reference) 3H025 DA02 DB18 DC02 DD01

Claims (3)

[Claims] 1. A gas shut-off device for introducing an inflatable / contractible bag into an end of a repair target portion of an existing pipeline when repairing the existing pipeline, and inflating the bag to shut off gas flow. A base having a peripheral wall made of a transparent body integrated on a pedestal corresponding to a communication hole formed at a position where the bag is inserted into the conduit, and integrally formed at a position facing the peripheral wall. And a bag insertion device having a bag insertion portion which is formed and communicates with the inside of the base portion, and a gas diffusion portion extended from the inside of the base portion to the outside and provided with an on-off valve at an external end. A gas shut-off device characterized by the above-mentioned. 2. A gas shut-off method in which an inflatable / contractible bag is introduced at an end of a repair target portion of an existing pipeline when the existing pipeline is repaired, and the bag is inflated to shut off gas flow. A base having a peripheral wall made of a transparent body integrated on a pedestal corresponding to a communication hole formed at a position where the bag is inserted into the conduit, and integrally formed at a position facing the peripheral wall. A bag insertion device having a bag insertion portion that is formed and communicates with the inside of the base, and a gas diffusion portion that is extended toward the outside from the inside of the base and provided with an on-off valve at the outside end is prepared. After the completion of the sealing of the communication hole performed after the formation of the communication hole, the bag insertion device is attached to the pipeline corresponding to the communication hole, and the plug plug used for the sealing is removed in the bag insertion device. , Insertion of bags and diffusion of gas flowing out between bags Gas shutoff method, which comprises carrying out, respectively. 3. The gas shut-off method according to claim 2, wherein said bag insertion device is provided with a plug stopper removal tool inserted therein.