Site-limited long-distance large-aperture horizontal directional drilling pipeline back-dragging construction process

Abstract

The invention relates to a site-limited long-distance large-aperture horizontal directional drilling pipeline back-dragging construction process, and relates to the technical field of pipeline installation. The site-limited long-distance large-aperture horizontal directional drilling pipeline back-dragging construction process comprises the following steps that S1, hole cleaning treatment is carried out; S2, back-dragging operation is tested; S3, back-dragging operation preparation is carried out, specifically, the following preparation work is carried out, specifically, (1) back-dragging pipes are arranged and paired, (2) anti-corrosion layers and protective layers of the back-dragging pipes are constructed, (3) the balance weight of the back-dragging pipes is increased so as to reduce the back-dragging force, (4) the back-dragging pipes are hoisted, (5) a drill rod and a drill bit are selected and checked, and (6) slurry is prepared and water is stored; S4, the first section of back-dragging pipe is dragged back; S5, the second section of back-dragging pipe is dragged back; S6, the step S5 is repeated until the last section of back-dragging pipe is dragged back into a pipe hole; and S7, the quality of the back-dragging pipes is inspected after the back-dragging is completed. According to the site-limited long-distance large-aperture horizontal directional drilling pipeline back-dragging construction process, the construction difficulty of the back-dragging pipes in the back-dragging construction process can be reduced conveniently.

Description

technical field [0001] The present application relates to the technical field of pipeline installation, and in particular relates to the pullback construction technology of long-distance large-aperture horizontal directional drilling pipeline with limited site. Background technique [0002] At present, with the development of China's urbanization process and the maturity and perfection of pipeline trenchless construction technology, horizontal directional drilling technology is widely used in Shanghai, Guangzhou, Beijing, Jiangsu and other places due to its low cost, short construction period, safety and environmental protection. It has been widely recognized and began to develop rapidly. [0003] Before the construction personnel install the pipeline, they need to select the guide entry point and the guide exit point on the road surface, and then install a horizontal directional drilling machine on the side of the guide entry point, and place a radius larger than the guide ...

AI Technical Summary

Problems solved by technology

[0005] Horizontal directional drilling, as a new, fast, safe and environmentally friendly construction technology, has good development prospects, but the directional drilling crossing process also has many limitations, such as limited drag pipe site, high hardness of rock formation, deep covering soil and difficult to judge the location of groundwater, etc. Special working conditions limit the popularization and application of directional drilling through technology

[0006] Among them, the limitation of the back-tow pipe site has a particularly prominent impact on the horizontal directional drilling process, making it difficult to align the back-tow pipe group, and it is impossible to prefabricate a complete back-tow pipe, thus increasing the back-tow period and greatly increasing the collapse and shrinkage of directional drilling. Due to the complex terrain of the construction site, it is usually necessary to cross mountains and rivers, which brings great difficulties to the transportation pipeline.

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