JPH0526387A - Gas bag - Google Patents

Abstract

PURPOSE:To cut off a branch hole of a gas conduit from the inner side of the gas conduit without hampering the gas flow. CONSTITUTION:A hollow tubular main body 1 provided with a gas passage 2 penetrating at the center is formed of a soft material having an airtightness such as a rubber coated nylon cloth, and doughnut form seals 4 and 4a whose diameter is larger than that of the main body 1 are formed unitary at both sides of the main body 1, they are inserted in a gas conduit 8 from a service tee 7, the air is poured inside the main body 1 through an air hose 3 to expand the main body 1, and the branch hole of the gas conduit 8 is cut off by surrounding the branch hole from the inner side. And by pouring and releasing the air by utilizing the air hose 3, this gas bag is expanded and contracted, and thereby, the gas flowing out from the branch hole of the conduit 8 is cut off without hampering the gas flow in the gas conduit 8. Consequently, a large scale of work in the conventional way can be omitted when the work is carried out at the branch pipe side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas bag for blocking a hole provided in a gas conduit from the inside while keeping a gas flowing.

[0002]

2. Description of the Related Art When connecting a branch pipe (main pipe) to a gas conduit (main pipe), and when the gas conduit is a cast iron pipe, a hole formed in the gas conduit is called a service charge. A piping method in which a branch member is set up and a branch pipe is connected to the branch member is adopted.

When such a piping method is adopted, if it becomes necessary to replace the branch pipe or the service team later, if the construction is carried out as it is, gas will leak. Therefore, conventionally, as shown in FIG. 4, a gas bag insertion hole 0 is provided at two locations before and after the service station 02 which is set up in the gas conduit 01.
3, 03 'are perforated, the main ball 04 and the reverse ball 05 are respectively inserted from there, and the bypass pipe 6 is attached to secure the gas demand on the downstream side.

[0004]

Therefore, there are the following drawbacks. a. Gas bag insertion holes 03, 03 'are drilled at two places, and a total of four main balls 04 and reverse balls 05 are inserted,
Mounting the bypass pipe 06 requires a lot of labor and construction cost. b. Since gas conduits are usually buried underground, it is necessary to excavate large working ditches, which adds to the expense and, in the case of construction on the road, a major obstacle to traffic.

An object of the present invention is to provide a gas bag capable of performing work without interrupting the large-scale work described in the above items a to b by cutting off the gas flowing to the service team side with the live tube. .

[0006]

The constitution of the present invention is as follows.

A hollow cylindrical main body is formed of a gas-tight and flexible material by penetrating a gas passage in the center, and on both sides of the main body, the diameter is larger than the outer diameter of the main body and A gas bag formed by integrally forming a donut-shaped seal part communicating with the hollow part of the main body with an air hose attached to the center of the main body.

In the above structure, in order to stabilize the shape of the hollow cylindrical main body and ensure the sealing performance of the seal portions on both sides, the inner and outer skins of the hollow cylindrical main body are arranged at equal intervals in the axial direction. It is good to make a hanging seal.

The surface of the seal portion may be coated with an elastic body or a sealing material in order to improve the adhesion and wear resistance to the inner surface of the pipe.

[0010]

[Function] Exposing the service chee part by exposing it, open the plug attached to the upper opening of this service chee, insert the gas bag in a deflated state into the gas conduit, and supply the air through the air hose. Inject and inflat the gas bag in the gas conduit. The seal portion of the inflated gas bag is in close contact with the inner surface of the tube, and the inlet portion of the service tee is located in the hollow cylindrical body portion having just a small diameter. As a result, the entrance of the service Qi is surrounded by a gas bag,
The gas flow from the gas conduit side is shut off. However, the flow in the gas conduit is ensured because the gas bag is hollow. After the completion of construction work such as replacement of the service Qi or branch pipes, the air in the gas bag is bleeded from the air hose and then withdrawn.

[0011]

1 and 2 show a gas bag according to the present invention.

Reference numeral 1 is a hollow cylindrical main body provided through the gas passage 2 in the center, made of rubberized nylon cloth, and an air hose 3 is attached to the upper center part.

Reference numerals 4 and 4a are integral with the main body 1 to form a donut-shaped seal portion having a diameter larger than this diameter, and the insides of the seal portions 4 and 4a communicate with the inside of the main body portion 1.

An elastic seal material 5 is attached to the outer surfaces of the seal portions 4 and 4a to improve airtightness and reinforce.

In the main body 1, 6 is an inner skin 1a and an outer skin 1b.
A hanging seal portion is formed by adhering stripes at regular intervals, and this is for maintaining and strengthening the cylindrical shape of the main body 1.

FIG. 3 shows an example of the use of the air bag a, in which the deflated air bag a is inserted into the gas conduit 8 via the service tee 7 and air is injected from the air hose 3 to produce air. Inflate bag a. The air bag a swells like a drum, and the seal parts 4 and 4a are gas conduits 8.
Adheres to the inner surface of. As a result, the branch hole 9 of the gas conduit 8
(Service Qi entrance) is surrounded from the inside,
The gas entering the service station 7 is shut off.

[0017]

As described above, in the gas bag according to the present invention, the holes formed in the gas conduit can be easily cut off from the inside by injecting or withdrawing air.

As a result, it is possible to shorten the construction period and save the cost, and to minimize the traffic obstacle as well as the conventional large-scale construction. or,
The air bag is easy to use because it can be used simply by injecting or removing air.

[Brief description of drawings]

FIG. 1 is a front view of a gas bag.

FIG. 2 is a sectional view taken along line AA ′.

FIG. 3 is an explanatory view of a usage state of the gas bag.

FIG. 4 is an explanatory diagram of a conventional construction example.

[Explanation of symbols]

1 body 2 gas passages 3 Air hose 4, 4a Seal part 5 Elastic seal material 6 Hanging seal part 7 Service Qi 8 gas conduits 9 branch holes

Claims (3)

[Claims] 1. A hollow cylindrical main body which is formed of an airtight and flexible material and penetrates a gas passage in the center thereof, and has a diameter larger than the outer diameter of the main body on both sides of the main body.
A gas bag in which a donut-shaped seal part communicating with the hollow part in the main body is integrally formed with the main body, and an air hose is attached to the center of the main body. 2. The gas bag according to claim 1, wherein an inner skin and an outer skin of the hollow cylindrical main body are suspended and sealed at equal intervals in the axial direction. 3. The gas bag according to claim 1, wherein an elastic body is coated or coated on the surface of the seal portion to improve airtightness.