Deep foundation pit dewatering and decompressing combination well controlled in subsection manner

Abstract

The invention relates to a deep foundation pit dewatering and decompressing combination well controlled in a subsection manner, which comprises a high-pressure air guiding tube, a well tube, a phreatic aquifer filtering tube, an air sac water stopping disc (including an annular steel groove, an air sac, a connector, a sealing gasket, an air inlet and a rubber band), a confined aquifer filtering tube, a precipitation tube and an air pump. A phreatic water dewatering well and a confined water decompressing well in deep foundation pit dewatering can be combined, the filtering tubes are arranged in a phreatic aquifer and a confined aquifer in a subsection manner, and the air sac water stopping disc is disposed between the two filtering tubes. After well completion is finished, the air sac water stopping disc is started, is opened via high-pressure gas and is sufficiently opened in the annular steel groove, and phreatic water and confined water in the well tube are separated. When the decompressing well needs to be opened, the air sac discharges and extracts gas and recovers under effects of the built-in rubber band and negative pressure, a water pump descends to a confined water well pipe section, and water of the phreatic aquifer and water of the confined aquifer are drained simultaneously. The combination well resolves the difficult problem that phreatic water and confined water in an existing mixed well cannot be separated, and environmental geology is damaged due to the fact that the confined water is pumped for a long time. The purpose of combining the two wells is realized, and the quantity of dewatering wells is greatly reduced.

Description

technical field [0001] The invention belongs to the field of deep foundation pit dewatering mainly used in municipal engineering, industrial and civil construction projects, and in particular relates to a segmentally controlled deep foundation pit dewatering dewatering-decompression synthetic well. Background technique [0002] At present, in the dewatering of foundation pits, because the mixed wells cannot realize the isolation of diving and confined water in the wells, the drainage wells and relief wells are separated, which greatly increases the project cost. The construction process of digging and supporting has also caused great difficulties in the protection of the well, but the present invention realizes both the dewatering well and the decompression well under the condition of ensuring that the submerged dewatering and the pressurized water decompression are respectively controllable. The integration of wells greatly reduces engineering costs, construction time, the ...

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Problems solved by technology

Although the water-proof effect of the valve is good, because the space required for installing the valve underground is large, a large-diameter drill hole is required; although the airbag-type water-proof plug (piston-type water-proof plug) can easily adjus

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