D-shaped spiral corrugated pipe and manufacturing method

Abstract

The invention relates to a D-shaped spiral corrugated pipe and a manufacturing method, which can be used for not only effectively improving the strength of a large-bore corrugated pipe, but also fundamentally improving the elasticity of the large-bore corrugated pipe. The D-shaped spiral corrugated pipe comprises an inner pipe, the section of a metal pipe wound on a body of the inner pipe is of a D-shaped structure, the bottom of the D-shaped metal pipe is composited with the body of the inner pipe, and a plastic layer is composited on the surface of the D-shaped metal pipe. The D-shaped spiral corrugated pipe has the advantages that firstly, the bottom of the D-shaped metal pipe contacts with the surface of the inner pipe, so that pressure on the inner pipe is greatly relieved and the supporting strength and the pressure bearing capacity of the inner pipe are greatly improved when the D-shaped metal pipe is pressed, secondly, reliable combination of the D-shaped metal pipe and the wall of the inner pipe is ensured as a plastic wedge is embedded into a through hole arranged at the bottom of the D-shaped metal pipe along the length direction, and thirdly, a plastic rivet cap is formed to integrally and firmly connect the plastic layer positioned on the surface of the D-shaped metal pipe with the surface of the D-shaped metal pipe, so that the corrugated pipe is prevented from layering in use.

Description

technical field [0001] The invention relates to a D-shaped spiral corrugated pipe which can not only effectively improve the strength of the large-diameter corrugated pipe but also fundamentally improve the elasticity of the large-diameter corrugated pipe and a manufacturing method thereof, belonging to the field of corrugated pipe manufacturing. Background technique [0002] CN201078525Y, name "socket electrofusion connection type steel belt reinforced polyethylene spiral corrugated pipe", which is used to solve the problems of easy leakage and poor reliability of the connection interface of steel belt reinforced polyethylene spiral corrugated pipe. Socket electrofusion connection steel belt reinforced polyethylene spiral corrugated pipe is to fix the wound metal skeleton on the inner layer polyethylene with the outer layer polyethylene, especially one end of the bellows is provided with a socket, and the other end of the bellows is provided with a socket. There is a socket...

AI Technical Summary

Problems solved by technology

[0002] CN201078525Y, name "socket electrofusion connection type steel belt reinforced polyethylene spiral corrugated pipe", which is used to solve the problems of easy leakage and poor reliability of the connection interface of steel belt reinforced polyethylene spiral corrugated pipe

Its disadvantages: First, the metal frame is an external structure, and the line-surface contact with the inner layer of polyethylene is formed instead of surface contact. Damage to the inner layer of polyethylene will directly affect the quality of the tube, and even cause damage to the inner layer of polyethylene; second, the support strength is low, because the metal skeleton is an external structure, and the two sides of the metal skeleton move outward under external pressure, which not only causes metal The delamination of the skeleton and the inner layer of polyethylene leads to a direct decrease in the strength of the inner layer of polyethylene; third, because the outer layer of polyethylene and the metal skeleton are two different materials, the coefficients of thermal expansion and contraction are different due to the influence of temperature. Not the same, so delamination inevitably occurs during use, resulting in a sharp drop in the strength of the bellows and the collapse of the bellows

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