JPS6131788A - Feed-gas continuous piping method - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Object of the Invention: Field of Application, Prior Art, etc.) The present invention relates to a method for uninterrupted supply gas piping.

Conventionally, when replacing part of an existing pipe without interrupting the gas flow, for example, a bypass hose was provided across the desired cut point, and after gas was allowed to flow through the bypass hose, the existing pipe was replaced. After inserting a comb bulb and inflating it inside the pipe to cut off the flow of gas, the existing pipe was cut at the desired cutting point and replaced. For this reason,
It took time and effort to insert, expand, deflate, and take out the rubber balls, resulting in very poor workability. The present invention eliminates the drawbacks of using rubber balls by simultaneously blocking and cutting the steel pipe while crushing it, that is, simultaneously blocking and cutting the pipe. . (The following is the structure and operation of the invention) Below, a riser pipe 2 is provided in the sleeve 1,
A sleeve pipe joint 4 in which a new pipe connection part 3 is provided on the riser pipe 2
An example will be explained by taking as an example. Reference numeral 5 is an existing pipe, and 6 is a desired cutting point thereof. Desired analysis point 6
The main bypass pipes 8 are installed in parallel by attaching the joints 4 to both outer sides and connecting the new pipes 7 to the connecting portions 3 of the joints 4. Therefore, the riser pipe 2 of the joint 4 is
A shutter device (not shown) equipped with a shutter valve is installed, a drilling machine is attached to the device, and the hole is drilled. When the drilling is completed, a plug 9 is attached to the threaded portion of the riser pipe 2, and the shutter device is installed. Remove.

At the time when the existing pipe 5 is perforated, gas also flows through the main bypass pipe 8, so that the gas flows into both the existing pipe -f5 and the main bypass pipe 8. In this state, the tube 5 is cut while being crushed, for example, in a wave shape, while crushing the desired cutting point 60. That is, the gas is shut off and the pipe is cut simultaneously. By making the cut at two locations F, the desired cutting location 6 can be cut.

By such cutting, the gas is allowed to flow only through the main bypass pipe 8. Any device may be used as long as it can close and cut the tube while crushing it, but an example is Tool 2 of Japanese Patent Application No. 92171/1982.

(Hereinafter, the effects of the invention) Since the present invention is as described above, when installing the piping, there is no need to interrupt the flow of gas, and the work of inserting, expanding, deflating, and taking out the rubber balls into the pipes is completely eliminated. Therefore, it has the excellent effect of greatly improving workability.

[BRIEF DESCRIPTION OF THE DRAWINGS] The figure is an overall explanatory diagram. Code 1...Sleeve, 2...
Rising pipe, 3. New pipe connection, 4. Joint, 5. Existing pipe, 6. Desired cutting point, 7. New pipe, 8. Main bypass pipe.
9...Flag 0 flag.

Claims (1)

[Claims] By attaching joints on both sides of the desired cutting point of the existing pipe and connecting the new pipe to the joints, the main bypass pipe was installed in parallel, and gas was allowed to flow through the main bypass pipe together with the existing pipe. Then, a desired cut point of the existing pipe is closed and cut while being crushed to allow gas to flow only through the main bypass pipe.