Deep foundation pit support soil-retaining and water-isolating method and device thereof

Abstract

The invention relates to a deep foundation pit support soil-retaining and water-isolating method, which comprises the following steps: S1, drawing in a plurality of grouting perforated plastic pipes in parallel from the outer side of the long edge of one side of the deep foundation pit to the outer side of the long edge of the other side of the deep foundation pit, wherein breakable connection form at the middle part of the grouting perforated plastic pipes through a connecting mechanism; S2, pulling the pull rope connected with the connecting mechanism to disconnect the grouting perforated plastic pipes from the middle part, and pulling out part of the disengaged grouting perforated plastic pipe for reuse; S3, grouting by compaction from the holes formed at the two ends of the grouting perforated plastic pipes to form a bottom soil-retaining plate and two soil-retaining and water-isolating walls at the long sides of the deep foundation pit; S4, arranging vertical water-stopping and soil-retaining perforation grouting pipe core piles on the outer sides of the two opposite short sides of the deep foundation pit to form soil-retaining and water-isolating walls on the two short sidesof the deep foundation pit. The method realizes all-around support to and water isolation for the deep foundation pit, reuses materials and reduces cost. The deep foundation pit support soil-retainingand water-isolating method and device thereof also provides a deep foundation pit support, soil-retaining and water-isolating device.

Description

technical field [0001] The invention relates to foundation pit construction technology, in particular to a deep foundation pit supporting method for retaining soil and water and a device thereof. Background technique [0002] A deep foundation pit refers to a project where the excavation depth exceeds 5 meters (including 5 meters), or the basement has more than three floors (including three floors), or the depth does not exceed 5 meters, but the geological conditions, surrounding environment and underground pipelines are particularly complicated. The deep foundation pit provides a space for the foundation masonry of the building, so that the foundation masonry can be carried out in the designated position according to the design. [0003] The problem of groundwater level must be solved in the construction of deep foundation pits. At this stage, the method of pumping water at the well point is generally used to reduce the groundwater level. The excavated soil is always kept ...

AI Technical Summary

Problems solved by technology

There are disadvantages in this method of well point pumping. On the one hand, this method belongs to the method of artificially lowering the water level, which consumes a lot of manpower and has low work efficiency; on the other hand, this method cannot completely solve the problem of groundwater level. After the point pumping is over, the deep foundation pit may still be affected by groundwater, which will affect the entire building

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