Standby and observation well for foundation pit dewatering

Abstract

The invention relates to the technical field of civil construction, in particular to a standby and observation well for foundation pit dewatering to achieve the technical purposes that the water level measurement error is reduced, and the foundation pit surrounding environment influence is reduced. The well comprises a well pipe, a filtering pipe, a sediment pipe, a filter material layer, a clay ball layer and a backfill soil layer, wherein the well pipe, the filtering pipe and the sediment pipe are sequentially connected in series from top to bottom. The filtering pipe is divided into three pipe sections from top to bottom. The pipe wall in the middle section of the filtering pipe is waterproof, and the pipe walls of the other two pipe sections of the filtering pipe are permeable. An annular baffle is axially fixed in the middle section of the filtering pipe. An annular lower sealing cushion is fixed to the upper baffle face of the baffle. An immersible pump is arranged in the filtering pipe. A pull rope is fixed to the immersible pump. A connecting pipe is fixed to the lower end of the immersible pump and coaxially sleeved with an annular cover plate. An annular upper sealing cushion is fixed to the lower plate face of the cover plate. The standby and observation well for foundation pit dewatering can serve as a foundation pit dewatering observation well and can also serve as a foundation pit dewatering standby well.

Description

technical field [0001] The invention relates to civil engineering construction technology, in particular to a technology for foundation pit dewatering standby and observation well. Background technique [0002] During the excavation of deep foundation pits, it is very necessary to reduce the groundwater level of the excavated soil layer and the aquifer that may cause the confined water surge of the foundation pit floor by means of dewatering. In deep foundation pit engineering in soft soil areas, due to the deep excavation depth, tube wells are generally used to reduce the water level in the aquifer. In order to achieve on-demand precipitation, observation wells should be set up in areas where precipitation is weak, and a certain number of spare wells should be set up in consideration of the requirements for construction safety reserves. At present, in the design process of foundation pit dewatering, the spare wells are generally directly used as observation wells, and the ...

AI Technical Summary

Problems solved by technology

At present, in the design process of foundation pit dewatering, the spare wells are generally directly used as observation wells, and the structure of the observation wells directly adopts the structure of the spare wells, while the groundwater is in an obvious three-dimensional flow state during the dewatering process of the foundation pit, and the spare wells are the direct result of the observation wells The measurement error of the water level at the top of the aquifer is large, which will increase the water inflow of the foundation pit and increase the impact on the surrounding environment of the foundation pit

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