Dewatering and drainage system of subway station open-cut interval foundation pit

Abstract

The invention discloses a dewatering and drainage system of a subway station open-cut interval foundation pit. The dewatering and drainage system comprises a plurality of dewatering wells and a plurality of water collecting pits, wherein the dewatering wells and the water collecting pits are distributed at the bottom of the foundation pit at intervals, the water collecting pits communicate through an in-pit drainage ditch net arranged on the bottom surface of the foundation pit, the in-pit drainage ditch net comprises an annular ditch distributed along the periphery of the bottom surface of the foundation pit, and a plurality of connecting ditches. and the plurality of connecting ditches communicate with the plurality of water collecting pits and the annular ditch. The system has the advantages of simple structure, easiness in implementation, good dewatering and drainage effects and the like.

Description

technical field [0001] The invention relates to the technical field of subway construction engineering, in particular to a drainage and drainage system for a foundation pit in an open-cut section of a subway station. Background technique [0002] During the construction of the subway station, the foundation pit needs to be excavated before the construction of the main structure of the subway station. Before excavation of the foundation pit and during the excavation of the foundation pit, a dewatering well should be constructed first, and the groundwater in the soil layer within the excavation range should be drained in time, so as to facilitate the excavation of the earthwork and help to improve the passive area and excavation area of ​​the enclosure structure. The strength and rigidity of the excavated surface soil ensure the smooth excavation of the foundation pit and the construction of the underground structure to create an anhydrous working condition, including reducing...

AI Technical Summary

Problems solved by technology

[0003] The dewatering and drainage of the existing subway station construction foundation pit is mainly to set up multiple dewatering wells in the foundation pit for dewatering and set up multiple sump pits for dewatering, and the dewatering and drainage effect is poor

In addition, in order to prevent the sand in the soil from entering the well pipe and causing the sand content to exceed the standard, the existing dewatering well only fills a simple sand filling layer between the well pipe and the well hole. The filtering effect is poor, and it is difficult to ensure that the sand content meets the requirements. It is easy to cause holes in the geological layer around the wellbore, which reduces the overall stability and service life of the dewatering well, and there is also the problem of easy blockage

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