Deep foundation pit water collecting well drainage structure and construction method

By installing an external pipe and sedimentation chamber structure in the deep foundation pit water collection well, the problem of water accumulation and difficulty in seepage caused by the water seepage rate of the well wall being greater than that of the sand-free ash pipe was solved, thus achieving stable drainage and energy-saving and emission-reduction effects in the deep foundation pit.

CN117431983BActive Publication Date: 2026-06-09无锡北大建筑工程有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
无锡北大建筑工程有限公司
Filing Date
2023-10-19
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

In traditional deep foundation pit drainage structures, when the seepage rate of the well wall is greater than that of the sand-free mortar pipe, the water in the deep foundation pit is difficult to seep down, causing the foundation trench to be soaked and posing a safety hazard.

Method used

Design a drainage structure for a deep foundation pit sump, including a deep well, a sump, and a sand-free ash pipe. An outer pipe is installed outside the sand-free ash pipe, and multiple sedimentation chambers and overflow baffles with progressively decreasing heights are provided between the two. A submersible pump is used to promptly discharge the water overflowing into the outer pipe and control the water level in the deep well.

Benefits of technology

This effectively prevents deep wells from becoming filled, ensures that water in deep foundation pits can infiltrate in a timely manner, reduces water accumulation, lowers the sediment content of water pumped out by submersible pumps, and reduces energy consumption in municipal water supply and drainage processes.

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Abstract

This invention relates to the field of foundation pit dewatering technology, and in particular to a drainage structure and construction method for deep foundation pit sump wells. The drainage structure includes a deep well, a sump, and a sand-free ash pipe. The sump is located at the top of the deep well. The bottom end of the sand-free ash pipe extends to the bottom of the deep well, and the top end extends into the sump and protrudes from the bottom inner wall of the sump. An outer pipe is fixedly fitted around the sand-free ash pipe, located below the sump and above half the length of the sand-free ash pipe. Multiple sedimentation chambers of progressively decreasing height are provided between the outer pipe and the sand-free ash pipe. The drainage structure proposed in this invention can promptly discharge water from the deep well, thus preventing the deep well from becoming full and causing water accumulation in the deep foundation pit that is difficult to infiltrate. Furthermore, the discharged water contains less sediment, reducing the filtration and purification pressure on the municipal pipe network, thereby indirectly reducing the energy consumed in municipal water supply and drainage processes, achieving energy conservation and emission reduction.
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