Deep foundation pit confined water dewatering well plugging method: Fid-Bau Portal

Deep foundation pit confined water dewatering well plugging method

YANG SHENGDE / TU BOWEN / LI PINXU / GONG HAIBING / XU YA

The invention discloses a deep foundation pit confined water dewatering well blocking method which comprises the steps that first-time backfilling is conducted on a deep foundation pit through gravel, and the distance between the backfilling face of the first-time backfilling and the bottom face of a bottom plate is larger than or equal to a set value; a water pump and a sleeve are put down, a water outlet of the water pump is connected with a lower port of the water hose, and the water hose is sleeved with the sleeve; secondary backfilling is conducted through gravel, and the backfilling face of secondary backfilling is flush with the bottom face of the bottom plate; micro-expansion concrete is poured; and the sleeve is blocked. By applying the technical scheme provided by the embodiment of the invention, the concept of embedding a water pump in a sleeve is adopted, and the 211 technology of two-time backfilling, one-time well sealing and one-time pipe sealing is utilized for construction, so that the practical operability is high, the method is suitable for larger dewatering wells, particularly suitable for deep foundation pit confined water, convenient to construct, economical and applicable, the efficiency can be improved, the sealing quality can be improved, and the construction cost is reduced. The device is especially suitable for construction sites.

本发明公开了本发明所提供的深基坑承压水降水井封堵方法，包括步骤：用砂石向深基坑中进行首次回填，首次回填的回填面到底板底面的距离大于等于设定值；下放水泵和套管，所述水泵的出水口与水带的下端口连接，所述套管套装于所述水带上；用砂石进行二次回填，二次回填的回填面与底板底面平齐；浇筑微膨胀砼；封堵所述套管。应用本发明实施例所提供的技术方案，采用套管预埋水泵理念，利用两次回填一次封井一次封管的“211”技术施工，实际操作性强，适用较大型降水井，尤其适用深基坑承压水，施工便捷，经济适用，既可以提高效率，又能提高封堵质量，特别适合在施工现场使用。

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