Deep foundation pit hybrid precipitation well designed for multi-layer water-containing system

Abstract

The invention provides a deep foundation pit hybrid precipitation well designed for a multi-layer water-containing system. The deep foundation pit hybrid precipitation well comprises a well pipe, a drainage main pipe and a well-forming drilling hole wall, the well pipe is arranged along the well-forming drilling hole wall, the drainage main pipe is arranged along the well pipe, and the well pipe,the drainage main pipe and the well-forming drilling hole wall are coaxial; and a containing space between the outer wall of the well pipe and the well-forming drilling hole wall is sequentially provided with a sealing section, a first water-containing layer anti-filtering material section, a water stopping section and a second water-containing layer anti-filtering material section from top to bottom, and the well pipe sequentially comprises a first solid pipe body, a first water-containing layer filter pipe body, a second solid pipe body, a second water-containing filter pipe body and a precipitation pipe body from top to bottom. The deep foundation pit hybrid precipitation well designed for the multi-layer water-containing system has the beneficial effects that the operation process is simple, the precipitation process is stable and reliable, the common drainage of the multiple water-containing layers is realized, the precipitation efficiency is improved, the number of the precipitation wells is reduced, the construction cost is reduced, the construction period of the precipitation engineering is shortened, and relatively high practicability is achieved.

Description

Technical field [0001] The invention relates to the field of foundation pit dewatering engineering, in particular to a deep foundation pit mixed dewatering well designed for a multi-layer water-bearing system. Background technique [0002] With the rapid development of urban construction, high-rise, super high-rise buildings and underground buildings continue to increase, and the development of foundation pits in the direction of large depth and large area has become an inevitable trend. Due to the substantial increase in the depth of foundation pit excavation, engineers have The geological conditions are becoming more and more complex, and the design and construction are becoming more and more difficult. In order to avoid quicksand, piping and soil collapse during the excavation of the foundation pit, to ensure the safety and stability of the foundation pit, the smooth progress of the construction, and to prevent the seepage and deformation of the soil related to groundwater, it...

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Problems solved by technology

[0003] However, most of the aquifer systems in nature are multi-layered. With the increase of the excavation depth of the foundation pit, it is often difficult to deal with multiple aquifers at the same time in the dewatering design of the foundation pit, and these aquifers often have bearing capacity. If it is not handled properly, it will cause major engineering accidents

At present, in the deep foundation pit dewatering project, the traditional method is to separate the dewatering wells of each aquifer, resulting in too many wells in the foundation pit, which hinders the normal excavation and support construction process and increases the cost of the foundation pit dewatering project. The cost and construction period are unsatisfactory in terms of safety and economy

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