Method for reinforcement repair of pipeline by using metal hot spraying and fibrous composite

Abstract

The invention relates to a method for reinforcement repair of a metal pipeline with the defect, which is particularly suitable for on-site operations under the condition of continuous transmission of the pipeline. The method is characterized in that: after the surface of a pipe body is treated by using sand blast (recommended) or an electric angle grinder, the defect 2 is filled and leveled up by hot spraying metal alloy, and the surface of the integral circle of the pipe body 1 is sprayed to form a metal alloy basement layer 3, wherein the metal alloy basement layer has the excellent compression strength; a fiber resin composite 4 formed by fibers and an epoxy bonder is wound on the basement layer, the cured fiber resin composite has the high tensile strength and elastic modulus, so the fiber resin composite limits the radial dilatational strain at the defect, and reduces the stretching stress and stretching strain at the defect through the metal alloy basement layer to realize the reinforcement repair on the defect of the pipeline.

Description

technical field [0001] The invention relates to a method for reinforcing and repairing the pipe body defects of steel pressure pipes by utilizing externally wound fiber-reinforced plastic composite materials after metal thermal spraying. Reinforcement repair. Background technique [0002] Steel pipelines are the main carrier in my country's fluid medium transmission projects, but corrosion will occur under the action of the environment (atmosphere, soil, microorganisms, etc.) and the internal transmission medium, and the strength reduction and pitting and perforation caused by corrosion are very serious. Leakage Accidents happen from time to time, causing huge losses to the production of enterprises. For the repair of volume defects such as corrosion pits and grooves on the outer wall caused by corrosion, in the past, the methods of on-site welding to repair scars, sleeve sleeves or section cutting and re-welding of new pipe sections were mainly used. The ductile-brittle tr...

AI Technical Summary

Problems solved by technology

The metal alloy / fiber composite material reinforcement repair system has been developed, which solves the problem of low bonding strength between composite material and steel pipe body, large shrinkage rate of resin filler, and poor quality of resin filler in traditional composite material reinforcement repair technology. unstable problem

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