Anti-corrosive treatment method of welded junction part of construction process pipe of heavy caliber push pipe

Abstract

The invention relates to an anti-corrosive treatment method of a welded junction part of a construction process pipe of a heavy caliber push pipe. The pipe is arranged by applying an open type excavation construction or push pipe construction process; the process pipe is a section push-pipe construction pipe, all sections are fixed together by adopting a welding mode; an anode loss protection device (3) fixedly connected to the outer wall of the pipe is arranged outside the pipe, and a protection coating is arranged outside the whole pipe. The method is characterized by being particularly applied to the coating rapid junction repairing operation at the welded junction part of the outer wall of the pipe by using the solvent-free liquid epoxy coating so as to rapidly form an integral protection coating outside the pipe, wherein the performance of the solvent-free liquid epoxy coating meets the relevant requirements. The anti-corrosive treatment method of the welded junction part of the construction process pipe of the heavy caliber push pipe has the advantages of high construction speed, good protection effect, long service life and the like, and has huge predictable economic value and social value.

Description

technical field [0001] The invention relates to the anti-corrosion protection technology of metal pipelines, and in particular provides an anti-corrosion treatment method for welding joints of pipelines in large-diameter pipe jacking construction technology specially used for anti-corrosion of metal pipelines. Background technique [0002] The traditional long-distance pipeline pipe jacking construction is to connect the coated steel pipes by welding at the construction site and carry out pipe jacking one by one. The anti-corrosion coating of the welded part is called the joint. It is the main technical content in the pipeline anti-corrosion project. Its anti-corrosion effect determines the reliability of the pipeline operation. How to fill the joint and how to obtain a good anti-corrosion effect are directly related to the conditions of the joint construction site. [0003] The on-site jointing of large-diameter pipe jacking construction has the following characteristics: ...

AI Technical Summary

Problems solved by technology

Among them: the material of the fusion-bonded epoxy coating used in the first and second method pipelines is incompatible, and the adhesion between this filling material and the epoxy coating cannot be guaranteed, and due to the low bonding strength and Poor cathodic protection compatibility is not suitable for pipe jacking projects

In the third method, although the filling material is consistent with the pipeline coating material, it is not advisable to quickly construct on-site due to the huge equipment, tools and electrical equipment, which are greatly affected by environmental factors and complicated operations.

At present, the commonly used liquid epoxy coatings have low solid content and are all solvent-based coatings. The curing time is relatively long, and the construction process performance is worse at low temperatures. It is not suitable for pipe jacking projects.

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