Method for producing steel-plastic multi-element composite pipes

Abstract

The invention provides a method for producing steel-plastic multi-element composite pipes, which comprises the following steps of: modifying high-density polyethylene (HDPE) or polyvinyl chloride (PVC) plastics and manufacturing plastic plate strips; manufacturing hollow reinforcing ribs of which two side edges are recessed and overlapped; welding notches of the recessed bottoms of the reinforcing ribs by using continuous welding equipment; synchronously winding the welded reinforcing ribs with the plastic plate strips to form an inner wall of a pipe; coating and rolling on the wound pipe wall; coating a fiber mesh or winding a fiber strip and rolling on the rolled pipe wall; coating and rolling on a fiber layer to form an outer wall of the pipe; cutting the pipe which is finished in the seventh step at fixed length; sealing a port of each reinforcing rib at one end of the cut pipe, and injecting prepared cement slurry into each square reinforcing rib at the other end of the pipe by using grouting equipment; and finally, vertically erecting and fixing the pipe which is injected with the cement slurry, so that the cement slurry is solidified to form a finished pipe. The invention has the advantages that: the pipe can resist internal and external pressures and prevent cracking, an expansion on heating and contraction on cooling coefficient of the pipe is reduced, and the reinforcing ribs are prevented from rusting.

Description

Technical field: [0001] The invention relates to the technical field of pipe production, in particular to a production method of steel-plastic multi-component composite pipe. Background technique [0002] Replacing steel with plastic and developing pipeline transportation are two major development trends. Among them, plastic pipes have been widely used due to their high performance, high strength, light weight, wear resistance, corrosion resistance, low price and large diameter. Pipes have poor rigidity and temperature resistance and cannot be used in fields such as oil transportation and high-pressure water transportation; while metal pipes are characterized by good mechanical strength and no deformation, but their disadvantage is that they are prone to rust. Contents of the invention [0003] The object of the present invention is to overcome the deficiencies of the prior art and provide a production method of steel-plastic multi-component composite pipe with simple proc...

AI Technical Summary

Problems solved by technology

[0002]Replacing steel with plastic and developing pipeline transportation are two major development trends. The characteristics of low cost and large diameter have been widely used. Due to the poor rigidity and temperature resistance of this type of pipe, it cannot be used in fields such as oil transportation and high-pressure water transportation. The characteristics of metal pipes are that they have good mechanical strength and will not deform, but Its disadvantage is that it is easy to rust

Images