Synthetic resin pipe

Abstract

The invention provides a synthesized resin tube with smooth inner and outer face, which makes the connecting peak part of outer part flat so as to cut water off stably under the condition of no-damaged for softness, characterized in that inner tube (2) is winded to twist by belt synthesized resin; twist reinforced part (4) is winded to the outer wall of inner tube (2) by convex bar (3) of synthesized resin as outside twist; outer tube (5) made of belt synthesized resin, of which along the tube axis partial or all convex bar is arranged and peaks of said convex bars (3a) are connected; protecting part for outer tube (10) buried in outer tube (5) or attached on the one side of inner wall in outer tube, which protects the figure of outer tube (5) flat and is formed by belt metal sheet. The protecting part (10) for outer tuber is winded in regular interval status by the peak of convex bar (3) and set on adjacent peaks (3a) of convex bar.

Description

technical field [0001] The present invention mainly relates to a synthetic resin pipe buried underground, and in particular to a synthetic resin pipe with smooth inner and outer surfaces, which passes through cables for communication and electricity or is used as a pipe for sewage. Background technique [0002] In order to be able to withstand strong internal and external pressures, conventionally used synthetic resin bellows have a smooth inner surface and alternate peaks and valleys on the outer surface in the tube axial direction. [0003] Since such corrugated pipes have irregularities on the outer surface, it is difficult to construct smoothly when installing the pipes, and a special joint structure is required to bury the irregularities and ensure water-cutting performance when the pipes are connected. [0004] Therefore, there has been proposed a synthetic resin in which an outer tube is attached by winding a synthetic resin tape in a state where the crests of the bel...

AI Technical Summary

Problems solved by technology

[0006] However, in the above-mentioned conventional synthetic resin tube, since the synthetic resin tube shrinks in the tube axis direction when the synthetic resin tube is hardened, it cannot be avoided that the part of the outer tube connected to the peak is deformed into a curved state.

If the degree of curvature is large, the purpose of smoothing the outer surface of the synthetic resin tube cannot be achieved.

[0007] In order to prevent the deformation of the outer tube, it is also considered to thicken the outer tube wall, but this will increase the weight of the synthetic resin tube and reduce the flexibility

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