High water pressure precipitation well structure in metro station foundation pit and still water grouting blocking method

Abstract

The invention relates to the field of metro station foundation pit confined aquifer precipitation, in particular to a high water pressure precipitation well structure in a metro station foundation pitand a still water grouting blocking method, and the problem about blocking of a precipitation well under the situation of high water pressure is solved. The high water pressure precipitation well structure comprises a well pipe in the metro station foundation pit, the well pipe is a closed steel pipe, the top elevation of the well pipe is larger than that of the natural water level, the well pipepenetrates a bottom plate and a top plate of a station body, and a water pump is arranged in the well pipe. The still water grouting blocking method for the high water pressure precipitation well inthe metro station foundation pit is provided. A closed space is formed through a body structure and the precipitation well pipe, the water level is automatically elevated after water pumping is stopped, the pressure of the stratum and the water pressure inside and outside the precipitation well are balanced, still water is formed, grouting blocking is conduced, the method is novel, and construction is safe and reliable. The high water pressure precipitation well structure and the still water grouting blocking method are suitable for blocking of all precipitation wells, but the advantages in blocking of large water pressure and high water level shallow water or confined water precipitation wells are obvious, the technology is advanced, the application range is wide, practicability is high,and the popularization prospects are good.

Description

technical field [0001] The invention relates to the field of dewatering of a pressurized aquifer in a foundation pit of a subway station, in particular to a structure of a high water pressure dewatering well in a foundation pit of a subway station and a hydrostatic grouting sealing method. Background technique [0002] With the rapid development of urbanization, rail transit and high-rise buildings are becoming more and more popular, and the construction of deep foundation pits will become a normal trend. In these projects, the treatment of groundwater is the first problem to be faced. Due to the dewatering requirements of the confined aquifer in the foundation pit or the anti-surge demand of the base, the decompression and dewatering well in the foundation pit is already a common way of dewatering, but often under high water head pressure, the plugging of the high water pressure dewatering well is another problem. In the later period, how to solve the blockage problems suc...

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Problems solved by technology

[0005] Adding cotton wool and other things, then pouring concrete, and finally closing the cover plate, the process operation is relatively complicated; at the same time, because the top of the dewatering well in the above project moves down continuously with the excavation of earthwork, after the construction of the waterproof bottom plate of the building is completed, the height of the top of the dewatering well is only It is 50-80 cm larger than the bottom plate. Once the pump is stopped when the dewatering well is blocked, the water level in the dewatering well pipe will rise rapidly due to the high water pressure. It is difficult to seal the construction under the action of high water pressure, and improper operation may easily cause groundwater backflow foundation pit phenomenon

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