Metal-resin composite pipes

Abstract

Provided is a metal-resin composite pipe provided with a spiral reinforcing strip plate formed of metal in a pipe wall, in which sufficient pressure capacity and rigidity can be maintained even if the pipe wall is made thin and in which flexibility can be improved. The metal-resin composite pipe1 includes the pipe wall 2 formed in a spiral corrugated shape and a reinforcing strip plate 4 formed of a metal sheet provided in a similar spiral on at least a mountain portion 31 and both side wall portions 32 continuous with the mountain portion 31 of a spiral synthetic resin wall portion 3 constituting the pipe wall 2, the reinforcing strip plate 4 being provided with a single or a plurality of concave portions 41 along a peak portion.

Description

technical field [0001] The present invention relates to metal-resin composite pipes, which are mainly used for water supply pipes, sewer (drainage) pipes, protection pipes for inserting and protecting electric wires, telephone lines and other electric power and communication cables, etc. Metal-resin composite pipe with excellent workability and economy and compressive strength. Background technique [0002] In the past, such metal-resin composite pipes have been widely used in order to facilitate the handling of such metal-resin composite pipes when they are buried in the ground. Due to the strong ground pressure during burial, the pipe wall has to be made thick, and a large amount of synthetic resin is required for molding. The cost of materials increases, and the weight is also large, so it is not easy to carry or bury. [0003] On the other hand, as a structure capable of reducing the thickness of the pipe wall, it has been proposed to embed a metal helical reinforcing s...

AI Technical Summary

Problems solved by technology

[0004] However, burying and forming such a metal reinforcing plate can reduce the wall thickness of the pipe wall, but the internal flexibility (flexibility) of the helical wave-shaped pipe wall will be impaired by the internal metal strip plate, which will become difficult for workability. Reason for decrease

In addition, if the synthetic resin wall portion is thinned, the strength and rigidity of the mountain portion, which is likely to directly receive pressure and impact from the outside, are insufficient, and the risk of deformation and damage increases.

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