Water seepage drainage structure outside side wall of foundation pit and construction method thereof

Abstract

The invention relates to a water seepage drainage structure outside a side wall of a foundation pit and a construction method thereof. The structure comprises a plurality of water diversion assembliesarranged on the side wall of the foundation pit in the horizontal direction, a horizontal confluence pipe arranged below the water diversion assemblies and communicated with the water diversion assemblies, a vertical drainage pipe communicated with the horizontal confluence pipe and extending towards the top of the foundation pit, and a drainage pump arranged on the ground of the top of the foundation pit and connected with the vertical drainage pipe. The water diversion assemblies are located at a distance below the water seepage point on the side wall of the foundation pit. The position isfixed by the portion embedded in the side wall of the foundation pit, and the external water seepage is collected and introduced into the horizontal confluence pipe through the portion exposed on theside wall of the foundation pit. The application of the water seepage drainage structure can prevent the underground water from soaking the side wall of the foundation pit and prevent the undergroundwater from collecting into the foundation pit to influence the bearing capacity of the foundation pit and the construction progress. In addition, the drainage structure is simple in construction process and fast in construction speed, and can be flexibly arranged according to the seepage amount and the position of the seepage point in the excavation process of the side wall of the foundation pit.

Description

technical field [0001] The invention relates to the technical field of foundation pit excavation groundwater control, in particular to a foundation pit side wall external seepage drainage structure and a construction method thereof. Background technique [0002] At present, in the process of dewatering foundation pit tube wells, dewatering wells at a certain distance are generally arranged along the periphery of the foundation pit, and the groundwater in the foundation pit is reduced by pumping water through tube wells during the earthwork excavation process, which is convenient for earthwork excavation and underground structure construction. This dewatering method has been widely used in foundation pits with shallow groundwater levels and thick aquitards. The permeability is poor or the seepage of groundwater is slow, and the water catchment in the tube well is small, resulting in a high water level line of the tube well dewatering funnel, and the precipitation effect is no...

AI Technical Summary

Problems solved by technology

This dewatering method has been widely used in foundation pits with shallow groundwater levels and thick aquitards. The permeability is poor or the seepage of groundwater is slow, and the water catchment in the tube well is small, resulting in a high water level line of the tube well dewatering funnel, and the precipitation effect is not ideal, and the groundwater in the blind area of ​​the tube well dewatering funnel and the upper part of the aquifer cannot be drained through the tube well, and the foundation pit is excavated During the process, it will flow into the foundation pit along the side wall of the foundation pit, seriously affecting the stability of the soil mass on the side wall of the foundation pit and the construction progress in the foundation pit

[0003] At present, for this kind of situation, it is generally used to collect water in the pit or use light well points for dewatering. However, for foundation pit projects with complex stratum structures, the bedrock surface changes greatly, and bedrock seepage cannot be determined when light well points are arranged. The problem is that the treatment effect is not complete, and the use of drainage in the pit will have a certain impact on the earthwork excavation and the construction of the underground structure in the later stage, and it will also have a certain impact on the civilized construction of the project.

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