Photocuring prepreg sheet for pipe directional drilling crossing protection

Abstract

The invention discloses a photocuring prepreg sheet for pipe directional drilling crossing protection. The sheet is a reinforcing base material of an impregnated resin adhesive. The reinforcing base material comprises long glass fiber axial cloth and a glass fiber chopped strand mat which are stacked and compounded. The long glass fiber axial cloth comprises a first unidirectional laying layer anda second unidirectional laying layer which are obtained through laying of fiber twistless rough yarn, and the axial included angle of the fiber twistless rough yarn in the first unidirectional layinglayer and the second unidirectional laying layer is 90 degrees. According to the photocuring prepreg sheet for pipe directional drilling crossing protection, the stacked long glass fiber axial clothand the glass fiber chopped strand mat serve as the reinforcing base material, the long glass fiber axial cloth is provided with the two 0-degree / 90-degree axial laying layers composed of the twistless rough yarn, the two laying layers are in a stacked shape, and the tensile strength of the sheet is high. Under the condition that a cured protective layer is locally stressed, the mutual acting force of the twistless rough yarn between the laying layers is small, and therefore the protective layer has better abrasion resistance and scratch resistance. The invention also discloses a surface layercoating structure for pipeline crossing.

Description

technical field [0001] The invention relates to the technical field of pipeline surface anticorrosion, in particular to a light-cured prepreg sheet for pipeline directional drilling protection and a surface coating structure for crossing pipelines. Background technique [0002] Pipeline crossing refers to the means of laying pipelines underwater or underground to form pipelines passing through rivers, lakes, railways, and highways. The continuous friction between the surface layer and the bottom layer of the pipeline during the directional drilling of the long-distance pipeline will easily damage the anti-corrosion layer of the pipeline, which will affect the service life of the pipeline. The damage pattern of the pipeline anti-corrosion layer within 20m before the pullback is the most serious. In the improved technical solution, the pipeline is first covered with a light-cured prepreg sheet for directional drilling protection, and then cured to obtain a protective layer ma...

AI Technical Summary

Problems solved by technology

[0004] The grid fiber cloth used for pipe coating in the prior art is usually formed by interweaving glass fibers as warp and weft yarns. The above-mentioned grid fiber cloth is easily deformed during the coating process. After curing, the pipe is squeezed by external force, and the warp and weft yarns The internal stress of the interweaving part increases, resulting in lower pressure bearing capacity of the pipe body; the roving of the glass fiber grid cloth is not conducive to the adhesion of the resin glue, so it is necessary to use epoxy viscose-glass fiber cloth multiple interval covering structure

In addition, the cladding method of sequential lapping has the following defects: First, the axial surface of the pipeline is concave-convex, and the concave and convex parts are easily scratched by the rock in the drill hole, and finally formed on the surface passing through the pipeline along the axial direction of the pipeline. Second, the wrapping tape passing through the bottom of the pipeline overlaps the inner layer with a small amount of light and cannot be fully cured, forming a defect area of ​​the pipeline protective layer

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