Connecting device and connecting method of internal and external anti-corrosion plastic-steel composite pipe

Abstract

The invention relates to the technical field of connection of internal and external anti-corrosion pipelines, in particular to a connecting device and connecting method of an internal and external anti-corrosion plastic-steel composite pipe. In the prior art, internal anti-corrosion on the joint of steel pipes needs to be welded at a construction site to be processed manually, and anti-corrosion quality cannot be guaranteed; allowable errors of pipe openings of the steel pipes are large, connecting strength is generally guaranteed by means of increasing of wall thicknesses, and butt joint difficulty of the pipelines is high. According to the technical scheme of the connecting device and connecting method, a joint A and a joint B are welded at the two ends of a pipeline in a factory and anti-corrosion treatment is carried out on the joint A and the joint B; at the construction site, joints A and joints B of end portions of two sections of pipelines just need to be butted and welded, and then an anti-corrosion thermal shrinkage belt is utilized to carry out external anti-corrosion treatment on welded junctions; internal thermal insulation grooves and external thermal insulation grooves are formed in the joints, thermal insulation linings are filled in the internal thermal insulation grooves, and seal rings are installed on end faces of the joints. The connecting device is simple in structure, convenient and fast to install, and suitable for industrialized production, on-site construction procedures are simplified, mechanical strength of the end portions of the pipelines is improved, steel is saved, and anti-corrosion performance is reliable.

Description

technical field [0001] The invention relates to the technical field of connecting high-strength internal and external anti-corrosion pipelines, in particular to a connection device and a connection method for internal and external anti-corrosion steel-plastic composite pipes. Background technique [0002] The corrosion of metal pipes directly affects the service life of the pipes. In order to prevent the corrosion of metal pipes, the inner and outer walls of the pipes are coated with anti-corrosion coatings. Anti-corrosion performance of joints between pipelines. [0003] The inner epoxy and outer polyethylene anti-corrosion steel pipe products on the market have better solved the anti-corrosion problem of the pipeline, but there are the following deficiencies in practical application: [0004] 1. The anti-corrosion inside the joints of anti-corrosion steel pipes needs to be handled manually at the construction site. Due to the poor construction environment and high labor i...

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Problems solved by technology

[0004] 1. The anti-corrosion inside the joints of anti-corrosion steel pipes needs to be handled manually at the construction site. Due to the poor construction environment and high labor intensity on site, the two-component liquid epoxy coating and the original hot-melt powder epoxy coating due to the construction environment Factors such as manual operation and other factors are not easy to ensure reliable lap joints, and cannot effectively ensure the anti-corrosion quality of the internal welds of anti-corrosion steel pipes;

[0005] 2. Due to the poor mechanical properties of the steel pipe nozzle, the anti-corrosion steel pipe is easily deformed by external forces during transportation, hoisting and installation, which leads to difficulties in connection and assembly, and increases the difficulty of on-site construction;

[0006] 3. Due to the large tolerance of the diameter and position of the nozzle of the steel pipe, it is difficult to ensure that the weld seam of the pipe connection has sufficient strength. It can be considered to increase the thickness of the steel pipe, which also increases the steel consumption per unit length of the pipeline, resulting in an increase in cost;

[0007] 4. Due to the large tolerance of the diameter and shape of the steel pipe, it is not easy to align the pipe mouth during on-site installation, and the construction of the pipe connection is time-consuming and labor-intensive, which is relatively difficult

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