Construction method by adopting dewatering and water recharging to control sedimentation surrounding deep foundation pit

Abstract

The invention discloses a construction method by adopting dewatering and water recharging to control sedimentation surrounding a deep foundation pit, which comprises the following steps that: quantity and depth of dewatering wells are accurately determined by calculating water inflow of the deep foundation pit under the action of pressure water and the construction quality of finished wells is guaranteed; aquifers and pervious beds of the soil outside the foundation pit are determined through a geological exploration report, a target soil layer to be recharged is calculated, and a steel sleeve is sent to the target soil layer through a method for drilling a slope inside the foundation pit; a high-level water tank is arranged on the top part of the foundation pit, the water outlet of the high-level water tank is connected with a recharging well opening, water inside the foundation pit is pumped by a high-pressure pump to the high-level water tank and then to be pressed to the recharging well through the high-level pressure and to reach the recharged target soil layer. By utilizing the method, the underground water level inside the foundation pit can be maintained at a set water level, so a favorable condition can be created to the project construction. At the same time, the underground water level outside the foundation pit is adjusted to be stably maintained within a warning level, so powerful guarantee can be created for the safety of roads and buildings outside the foundation pit.

Description

technical field [0001] The invention relates to a method for controlling the settlement of buildings (structures) around the foundation pit during the construction of deep foundation pits, especially in the construction of deep foundation pits in old urban areas with narrow construction sites. Background technique [0002] With the reconstruction of old cities and the development of urban traffic construction in China, the construction of deep foundation pits in China is increasing continuously. The traditional dewatering construction method of deep foundation pits uses simple well point dewatering, but after using well point dewatering, it is very easy to cause adjacent buildings, Cracking and sinking of pipelines and road surfaces. In recent years, major accidents caused by this are not uncommon. Therefore, special care should be taken in the precipitation of deep foundation pits and corresponding countermeasures should be taken. [0003] There are two main purposes of f...

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Problems solved by technology

If the built buildings, pipelines, and road surfaces are located within the radius of influence, and no

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