A soft soil foundation pit permeation increasing precipitation device and construction method

By introducing a liquid injection system, a ventilation system, and a drainage system into the soft soil foundation pit, the permeability of the soft soil is increased, which solves the problems of poor permeability and well pipe blockage during the dewatering process of the soft soil foundation pit, and achieves efficient dewatering effect and construction safety.

CN116517002BActive Publication Date: 2026-03-24SOUTHEAST UNIV +2
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-03-23
Publication Date
2026-03-24

AI Technical Summary

Technical Problem

Soft soil foundation pits suffer from poor permeability, well pipe blockage, and difficulty in effective drainage during dewatering, which affects the safety and efficiency of foundation pit construction.

Method used

The infiltration enhancement and dewatering device includes a liquid injection system, an aeration system, and a drainage system. By injecting a mixed solution, creating air disturbance and turbulence, and using vacuum suction, the permeability of soft soil is increased, seepage channels are formed, and fine sand is prevented from settling.

Benefits of technology

It improves the dewatering efficiency of soft soil foundation pits, solves the problems of soft soil fissure closure and fine sand sedimentation, ensures the safety of foundation pit construction, and is suitable for low-permeability soils in riverside and coastal cities.

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Abstract

The application relates to a soft soil foundation pit permeation-increasing precipitation device and a construction method, and belongs to the civil engineering field. The device is characterized in that a well pipe is pre-buried in a drill hole of a soft soil foundation pit; the gap between the outer wall of the well pipe and the inner wall of the drill hole is filled with filter material, the gap at the upper part of the outer wall of the well pipe is filled with clay and compacted; a liquid injection system is used for conveying a mixed solution to the side of the outer wall of the well pipe; an air supply system is used for conveying air to the side of the outer wall of the well pipe; and a drainage system is used for draining underground water in the well pipe. The application adds the liquid injection system, the air supply system and the drainage system on the basis of the existing well pipe structure. The mixed solution in the liquid injection system, the inorganic salt solution increases the permeability of the soft soil layer itself, the injection of fine sand can form sand veins, and the seepage channels in the soil body are opened; the disturbance turbulence function of the air supply system ensures the consistency of the mixed slurry injection in the stratum, and can make the soft soil layer form splitting cracks; and the drainage system improves the construction efficiency of the soft soil foundation pit precipitation.
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Citation Information

Patent Citations

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