A compound joint structure of counterweight layer for large-diameter submarine pipeline

Abstract

The invention discloses a composite mouth-repairing structure for a counterweight layer of a large-caliber submarine pipeline. The composite mouth-repairing structure comprises a mouth-repairing anticorrosive coating, a mould layer, ring-direction high-density polyurethane foam tiles and high-density polyurethane foams, wherein the mouth-repairing anticorrosive coating is arranged on outer surfaces of steel tube reserved welding sections and tube body anticorrosive coating mouth-repairing sections of two counterweight tubes, and is connected with tube body anticorrosive coatings on the end surfaces of the mouth-repairing sections of the two counterweight tubes; the two ends of the mould layer are respectively arranged on the outer surfaces of concrete counterweight layer mouth-repairing sections of the two counterweight tubes; the ring-direction high-density polyurethane foam tiles are arranged at the periphery of the mouth-repairing anticorrosive coating; the thicknesses of the ring-direction high-density polyurethane foam tiles are smaller than those of the concrete counterweight layers by 30-50mm; and the high-density polyurethane foams are filled between the ring-direction high-density polyurethane foam tiles and the mould layer in a site casting mode, and are integrated with the ring-direction high-density polyurethane foam tiles and the mould layer to coat the outer side of the mouth-repairing anticorrosive coating. According to the technical scheme disclosed by the invention, the technical problems that open-cell polyurethane foams are cured prematurely, mould filling is incomplete and time for reaching strength required by laying is long during filling construction of the counterweight layer of the large-caliber submarine pipeline in the prior art are solved.

Description

technical field [0001] The invention relates to the technical field of submarine pipelines for transporting oil and gas on the seabed, in particular to a large-diameter submarine pipeline counterweight layer composite joint structure. Background technique [0002] Most of the subsea pipeline laying projects use high-density open-cell polyurethane technology to fill the interface of the concrete weight layer. After the anti-corrosion (insulation) filling construction of the submarine pipeline is completed, the galvanized iron sheet is coated on the joint of the concrete counterweight layer to form a closed cavity at the joint, and then injected with high-density open-cell polyurethane foam raw material, which is matured to meet the requirements. After the pipe laying strength is required, it will be laid in the sea. [0003] In the prior art, in the construction of a single-layer submarine pipeline, when the diameter of the submarine pipeline is relatively large and the thic...

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Problems solved by technology

[0005] The embodiment of the present invention provides a large-diameter subsea pipeline counterweight layer composite filling structure, which is used to solve the problem of premature solidification of open-cell polyurethane foam and incomplete mold filling during the filling construction of the large-diameter single-layer subsea pipeline counterweight layer in the prior art And the technical problem that it takes a long time to reach the required strength for laying

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