Water descending system for foundation pits through deep wells and shallow wells for composite stratums of large-scale foundation pits and water descending method of water descending system

Abstract

The invention provides a water descending system for foundation pits through deep wells and shallow wells for composite stratums of large-scale foundation pits and a water descending method of the water descending system, relates to the technical field of civil construction, and aims to solve the technical problems that the water descending effects need to be improved and the water descending period needs to be shortened. The system comprises one or more deep-layer vacuum tube well units and a plurality of shallow-layer water descending tube well units, wherein the distribution density of the deep-layer vacuum tube well units is smaller than the distribution density of the shallow-layer water descending tube well units; the deep-layer vacuum tube well units are used for unwatering deep soil layers of the foundation pits for a long term, and the shallow-layer water descending tube well units and the deep-layer vacuum tube well units are used for jointly implementing quick unwatering on shallow soil layers of the foundation pits. The system and the method provided by the invention are suitable for water descending tasks for composite stratums of the large-scale foundation pits.

Description

technical field [0001] The invention relates to civil construction technology, in particular to a deep and shallow well foundation pit dewatering system and a dewatering method for a large-scale foundation pit composite stratum. Background technique [0002] With the development of urban underground space, more and more large-scale deep foundation pits are being constructed, and the control of groundwater during construction is becoming more and more important. The shear strength and the stability of the foundation pit are convenient for earthwork excavation and construction in the foundation pit. Generally, draining tube wells are used for dewatering. [0003] At present, for dewatering and precipitation, the drainage tube wells are generally arranged uniformly according to the area, and the depth is uniformly considered as 5-6m below the excavation surface, that is, the difference of the soil layer in the section within the excavation range is not considered, and the soil ...

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Problems solved by technology

[0003] At present, for dewatering and precipitation, the drainage pipe wells are generally arranged evenly according to the area, and the depth is uniformly considered as 5-6m below the excavation surface, that is, the difference of the soil layer in the section within the excavation range is not considered, and the soil of each layer is not considered. Due to the difference in excavation construction period, considering the convenience of construction and economical efficiency, the spacing of ordinary dewatering wells is insufficient for the dewatering density of shallow soil layers, while the distance between deep soil layers is relatively large, and there is a problem of precipitation. The defects of poor effect and long precipitation cycle

At the same time, the current layout of dewatering wells does not take into account the differences in formation, especially the disposal of local interlayers.

For large-scale foundation pits, due to the large area of ​​the foundation pit, the infiltration and discharge of surface water during rainfall is a relatively serious construction problem. Due to cycle and economic issues, there are few corresponding measures for such large-scale foundation pits

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