Long-distance and large-diameter industrial pipeline laying direct burial construction method under self-weight displacement

Abstract

The invention relates to a long-distance large-diameter industrial pipeline self-weight displacement downward installation directly-buried construction method and belongs to the technical field of underground pipeline installation. The invention provides a long-distance large-diameter industrial pipeline self-weight displacement downward installation directly-buried construction method, which adopts self-weight displacement downward pipeline installation so as to eliminate the simultaneous action of torsional stress and avoid ductile fracture. By adoption of the technical scheme, the method is operated according to the following steps of: scattering a lime line on the original ground according to the pipeline plane design central line position after cleaning the surface and flattening the field; arranging a pipeline and performing pipe ditch earth excavation from one end of the pipeline according to the specified width, sloping rate and depth in a synchronous backing form; performing pipe ditch earth excavation until the bottom of the pipeline is in a suspended state, and controlling the assembled pipeline to generate downward displacement in a vertical plane under the potential energy action of the self gravity, so that the pipeline section is downward gradually to be installed at the bottom of the ditch and straighten naturally. The long-distance large-diameter industrial pipeline self-weight displacement downward installation directly-buried construction method is widely applied to underground pipeline installation.

Description

technical field [0001] The invention relates to a long-distance large-diameter industrial pipeline laying direct burial construction method under self-weight displacement, and belongs to the technical field of underground pipeline laying. Background technique [0002] At present, there are two kinds of construction techniques for underground metal pipelines in China: one is to lay out lines according to the land acquisition boundary → remove surface attachments → excavate pipe trenches → trench inspection → pipe foundation treatment → dig operation pits → lay pipes on the ground Hanging to the bottom of the ditch → grouping of steel pipes under the ditch → welding under the ditch → weld seam inspection → anti-corrosion and anti-corrosion repair of weld joints → pouring of pipeline abutments → backfilling and compaction on both sides of the pipeline → hydraulic test → backfilling and restoration of the pipe trench above the pipeline topography. The other is to lay out the li...

AI Technical Summary

Problems solved by technology

[0003] The first process is to dig the trench first, and after laying the pipes on the original ground, use a crane to lift each pipe to the bottom of the ditch one by one. The assembly, welding, inspection, anti-corrosion and other processes are all performed under the ditch, which is inefficient and dangerous. Long construction period and large land occupation

[0004] The second process is to lay pipes on the ground first, and then assemble, weld, inspect, repair, and prevent corrosion on the ditch at a position parallel to the design center line of the pipeline. At the bottom of the ditch, the valve interface is welded, inspected, repaired, and anti-corrosion under the ditch. Compared with the first process, the efficiency is improved and the construction period is shortened. However, several pipe laying machines are required for the centralized lifting of the pipeline, which increases the construction cost and occupies a lot of land temporarily. During the pipe hoisting process, the butt weld of the steel pipe and the spiral weld of the base metal of the steel pipe are simultaneously subjected to the comprehensive action of bending, twisting and shearing forces

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