Pipeline renewal pipe

Abstract

Provided is a pipeline renewal pipe which can be smoothly inserted in an existing pipeline having a bent portion, and in addition can prevent damage during insertion into the existing pipeline and increases in pressure loss during fluid transportation. A pipeline renewal pipe (1) is formed by spirally winding a reinforcement core (3), which is made of a hard resin, around the outer circumferential surface of a pipe main body (2) which is made of a soft resin. The pipeline renewal pipe (1) is flexible enough to be able to be inserted in an existing pipeline (10) while the pipeline renewal pipe (1) is bent so as to follow a bent portion (15) of the existing pipeline (10). Therefore, when the pipeline renewal pipe (1) is bent, a pipe wall part (4) positioned between the reinforcement cores (3, 3) of the pipe main body (2) can be folded so as to protrude radially outward. A maximum protrusion dimension (L3) in the radially outward direction of the folded pipe wall part (4) is made to be smaller than a protrusion dimension (L2) in the radially outward direction of the reinforcement core (3) to thereby prevent the folded pipe wall part (4) from protruding radially outward more than the reinforcement core (3) of the folded pipe wall part (4).

Description

technical field [0001] The invention relates to a pipeline regeneration pipe which is inserted into the existing pipelines such as aging sewer pipelines or gas pipelines, and is used for regeneration of the existing pipelines. Background technique [0002] Conventionally, as a method of regenerating existing pipes for fluid transportation such as aging sewer pipes, a method is known in which a pipe regeneration pipe is inserted in the original state without replacing the existing pipes. In the existing pipeline, the internal space is made into a new space for fluid delivery. Most of the existing pipelines are formed by properly connecting straight pipes and bent pipes, and there are bends close to right angles in important parts. Therefore, as such a pipeline regeneration tube inserted into an existing pipeline having a bent portion, a flexible pipeline regeneration tube is generally used. [0003] As such a flexible pipeline regeneration pipe, as disclosed in Patent Docum...

AI Technical Summary

Problems solved by technology

At this time, if the slack part protrudes toward the inside of the tube diameter, a wrinkle-like protrusion that hinders the fluid delivery will be formed inside the tube body, and there is a problem that the pressure loss will increase during the fluid delivery.

[0008] On the other hand, when the slack protrudes ou

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