Steel-plastic composite pipe

Abstract

The invention discloses a steel-plastic composite pipe. The steel-plastic composite pipe comprises a steel strip (4) with a specially-shaped cross section and plastic coatings (2), and is characterized in that: the specially-shaped cross section of the steel strip is hollow and closed; the steel strip is spirally wound to form a tubular body (1); adjacent edges of the steel strip are fixedly welded; and both inner layer and outer layer of the tubular body are provided with the plastic coatings. Since the specially-shaped steel strip has a hollow and closed structure and is wound and welded to form the tubular body, the ring stiffness of a pipeline is obviously improved, high-strength pressure can be born, the pipe is difficultly degummed and squeezed to be broken, and the aims of high strength, high pressure bearing capacity, firm steel-plastic adhesion, difficulty in separating steel from plastic and continuous integral steel strips are fulfilled.

Description

technical field [0001] The invention relates to a pipe material, in particular to a steel-plastic composite pipe. Background technique [0002] Polyethylene drainage bellows and coiled pipes have excellent performance, but their low ring stiffness limits the depth of burial and load carrying. In order to obtain drainage pipes with high ring stiffness, various reinforcement methods have been adopted at home and abroad to produce steel belt reinforced polyethylene spiral corrugated pipes. The basic process is: apply viscose resin on the steel, and roll the steel into a "∩" special-shaped steel strip, then spirally wind it on the inner layer made of high-density polyethylene, and then apply it on the surface of the steel strip. A layer of high-density polyethylene resin is used, and the gap between the steel strips is filled with high-density polyethylene resin to obtain a steel strip-reinforced polyethylene spiral corrugated pipe. The reinforced composite pipes made in this ...

AI Technical Summary

Problems solved by technology

The reinforced composite pipes made in this way have achieved remarkable results in various properties, but because the steel strips are "∩" type, and the gaps between the steel strips are filled with high-density polyethylene resin, the structural strength of the pipes is extremely uneven, and the bearing Limited pressure capacity, prone to degumming and delamination, peeling and fracture at the trough of the steel strip, and cannot withstand internal pressure

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