Construction method of short-distance entry section of bar-pulling pipe in sandbar

By employing a staged borehole expansion and high-pressure grouting construction method, the challenge of short-distance pipe laying for access sections in sandy environments was solved, enabling smooth construction and cost reduction.

CN117684641BActive Publication Date: 2026-06-02CHINA FIRST METALLURGICAL GROUP
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Patent Information

Application Number
CN202311743292.3
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-12-15
Publication Date
2026-06-02
Estimated Expiration
2043-12-15

AI Technical Summary

Technical Problem

In sandy environments, the construction of short-distance access pipes faces challenges such as obstructed construction sites, inability to drill holes in the pipes, easy deformation of the pipes, easy grout seepage on the sandy surface, and high construction resistance, resulting in difficult construction and high costs.

Method used

The process involves steps such as construction preparation, surveying and setting out, well pit construction, equipment placement and directional drilling, hole enlargement, mud filling, secondary hole enlargement, hole cleaning, pipe welding, pipe pullback, high-pressure grouting and mud cleaning. Through staged hole enlargement and high-pressure grouting, a stable channel is formed to ensure smooth pipe pulling.

Benefits of technology

It enabled the successful construction of drag-and-drop pipes in sandy environments, reduced construction resistance, minimized ground grout leakage and pipe deformation, lowered construction costs, and reduced the impact on the surrounding environment.

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Abstract

The application discloses a sandbank short-distance entry section pipe-pulling construction method, which comprises the following steps: S1, preparation before construction; S2, measurement and lofting; S3, well chamber foundation pit construction; S4, equipment positioning and guide drilling; S5, hole expansion and mud hole blocking; S6, secondary hole expansion and hole cleaning; S7, pipe welding, pipe pulling back, and high-pressure grouting; S8, mud cleaning, pipe cutting at the well access, and equipment transfer; and S9, well chamber construction, foundation pit backfilling and cleaning. The application makes full use of the sandbank short-distance entry section pipe-pulling construction method, reasonably uses the trenchless technology to solve the problems of one-end construction site obstruction, pipe-pulling pipe hole forming failure, pipe-pulling construction resistance being too large, pipe deformation being affected by flowing sand and water level, sand surface appearing grouting and settlement, and the like, solves the problems of high cost and inability to carry out pipe jacking construction under the condition of shallow covering, and realizes the pipe-pulling construction of the entry section.
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