Strongly-permeable stratum deep foundation pit bottom sealing water stopping structure and construction method thereof

Abstract

The invention discloses a strongly-permeable stratum deep foundation pit bottom sealing water stopping structure, which comprises diaphragm walls, underwater plain concrete boards, reinforced concrete partition walls, uplift piles and inner supports, wherein the diaphragm walls are arranged around the foundation pit througgh casting; the inner supports support the diaphragm walls; the reinforced concrete partition walls are formed on the foundation pit below the diaphragm walls through casting; the reinforced concrete partition walls and the diaphragm walls of each two faces form a casting block in a surrounding mode on the foundation base; the uplift piles are casted on the foundation base inside the block; each underwater plain concrete board is formed through casting at each block opening formed by the reinforced concrete partition walls and the diaphragm walls in a surrounding mode; and the uplift piles are firmly embedded in the underwater plain concrete boards. The underwater plain concrete boards enhance overall strength and ridigity of the foundation pit bottom, dual effects of reinforced pit bottom and permeation prevention are provided, influences on stability of the pit bottom by high pressure water and raised pit bottom caused by excavation of the foundation pit can be effectively solved, and lateral displacement of the pit wall and settlement deformation of the surrounding enviornment can be well reduced.

Description

technical field [0001] The invention relates to the field of deep foundation construction in highly permeable strata, in particular to a bottom-sealing and water-stopping structure for deep foundation pits in highly permeable strata and a construction method thereof. Background technique [0002] At present, in deep foundation pit engineering, three methods are usually used to solve the engineering problems caused by confined water, such as precipitation outside the pit, vertical partition of curtain, and full grouting of the base. [0003] The first such as figure 1 The method of dewatering outside the pit, the design idea of ​​this method is: adopt the underground diaphragm wall as the enclosure structure, after the enclosure structure is completed, first carry out the construction of reducing the confined water inside and outside the pit, and when the confined water head drops to the design requirement Excavation of the foundation pit will be carried out after the elevat...

AI Technical Summary

Problems solved by technology

[0008] The disadvantage of this method is that the amount of grouting is very large, especially when the confined water layer is thick and buried deep, the cost of grouting is quite high

Once the grouting body has local quality problems, water leakage occurs in the basement, and groundwater rushes into the rock and soil layer above the basement. huge, slow

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