Plastic-filling construction method and tooling for broken pipe ends welded with flanges on lining-plastic composite steel pipe

Abstract

The invention discloses a plastic-filling construction method for broken pipe ends welded with flanges on a lining-plastic composite steel pipe, belongs to the technical field of pipeline installation and also discloses a hot-melting plastic-filling tooling for the plastic-filling construction method. The invention provides the plastic-filling construction method which can melt and fill a polyethylene plastic bushing into the lining-plastic composite steel pipe without easiness in peeling and falling in the use process. The invention also provides the hot-melting plastic-filling tooling for the plastic-filling construction method. The plastic-filling construction method comprises the following steps of: breaking the pipe, peeling a lining plastic layer and welding the flanges; preparing the polyethylene plastic bushing, putting the polyethylene plastic bushing into the lining-plastic composite steel pipe needing to be hot-melted and plastic-filled; preparing the hot-melting plastic-filling tooling, supporting the polyethylene plastic bushing on the inner side wall of the lining-plastic composite steel pipe; and hot-melting the polyethylene plastic bushing. The hot-melting plastic-filling tooling comprises a jacking device and a clamping pad, wherein the outer diameter of the clamping pad is adaptive to the inner diameter of the polyethylene plastic bushing; the longitudinal wall of the clamping pad is of a non-sealing structure; and the jacking device is connected in the clamping pad in a jacking manner.

Description

technical field [0001] The invention relates to a construction method for plastic lining, in particular to a construction method for plastic lining composite steel pipe welding flange end, which belongs to the technical field of pipeline installation. The present invention also relates to a hot-melt lining plastic tooling used in the construction method of lining plastic. Background technique [0002] In the prior art, during the installation and construction of flanged plastic-lined composite steel pipes connected by flanges, according to the actual situation of engineering design or engineering construction, it often happens that the flanged plastic-lined steel pipes are adjusted according to the actual length of the pipes required by the project. Composite steel pipes are installed with broken pipes and welded flanges. When welding the steel flange at the end of the broken pipe after the pipe is broken, in order to avoid the inner plastic pipe at the end of the pipe from...

AI Technical Summary

Problems solved by technology

Since there is an interface between the painted epoxy resin anti-corrosion layer and the fracture of the polyethylene-lined plastic pipe, they cannot be reliably integrated, and the epoxy resin anti-corrosion layer painted and cured at room temperature is easy to peel off under the conditions of cold and heat changes If it falls off, the integrity of the plastic-lined composite steel pipe lined with polyethylene plastic pipe is damaged, which reduces the corrosion resistance of the flanged plastic-lined steel pipe, thus limiting the application field of the flanged plastic-lined composite steel pipe

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