Plugging method for dewatering well in foundation pit

Abstract

The invention discloses a plugging method for a dewatering well in a foundation pit. The plugging method comprises the following steps that S1, the position of the dewatering well is selected, and a steel pipe is inserted to serve as the well wall of the dewatering well; S2, a water stop ring is welded to the neck of the steel pipe, and a connecting ring is welded to the top of the steel pipe; S3, a waterproof coiled material is arranged on the outer wall of the steel pipe and extends from the well bottom to the position below the water stop ring; S4, a water stop copper bar clamp is arranged below the water stop ring and used for clamping the waterproof coiled material; S5, bottom plates are laid on the two sides of the foundation pit and the two sides of the dewatering well, reserved plugging positions are arranged on the bottom plates, and steel pipes are arranged in the reserved plugging positions; S6, water pumps are placed in the steel pipes, water is cooled to the position 50cm below the lowest point of the foundation pit, and after a basement structure is completed, dewatering is stopped; S7, the water pumps are withdrawn, the dewatering well is filled with gravel, and a well lid with holes is additionally sealed on the connecting ring; and S8, grouting is conducted along the holes in the well lid. Underground confined water is plugged while pressure relief is conducted, the plugging quality is ensured, multiple waterproof measures are taken, and leakage of the structural bottom plates is avoided.

Description

technical field [0001] The invention relates to the field of foundation pit engineering, in particular to a method for plugging a dewatering well in a foundation pit. Background technique [0002] In the construction process of water-resistant slabs and rafts in the basement, due to the existence of underground confined water, the design usually sets up some dewatering wells around the foundation pit, increases the thickness of the structure, or adds anti-floating anchors to reduce the groundwater level and increase the resistance. float. However, because the width of the foundation pit is wide and the area of ​​the foundation pit is large, the water level in the middle of the foundation pit cannot be lowered by the dewatering wells around the foundation pit. Therefore, during the construction process, relevant units will add temporary dewatering wells in the center of the foundation pit or corresponding positions. , used to lower the water level of the foundation pit. [...

AI Technical Summary

Problems solved by technology

However, when the groundwater level is high and the water volume is abundant, due to reasons such as incorrect selection of the location of the dewatering well and imperfect traditional construction methods, etc., when the dewatering well is closed, it is impossible to block the underground pressurized water while releasing the pressure, resulting in the structural floor permanent water seepage

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