Bottom-sealing water-stop structure for deep foundation pit in highly permeable stratum and construction method thereof

Abstract

The invention discloses a bottom-sealing water-stop structure for a deep foundation pit in a strong water-permeable stratum, which comprises an underground continuous wall, an underwater plain concrete board, a reinforced concrete partition wall, an uplift pile and an inner support, and the underground continuous wall is arranged around the foundation pit by pouring , the internal support is supported on the underground diaphragm wall, and the foundation pit under the underground diaphragm wall is poured to form a reinforced concrete partition wall, and the reinforced concrete partition wall and the underground diaphragm wall on each two sides are enclosed at the base to form a pouring For the warehouse, uplift piles are poured under the base of the warehouse, and each warehouse opening enclosed by the reinforced concrete partition wall and the underground diaphragm wall is poured to form an underwater plain concrete slab, and the above-mentioned uplift piles are embedded in the underwater plain Inside the concrete slab. The underwater plain concrete slab increases the overall strength and stiffness of the pit bottom, and has dual functions of pit bottom reinforcement and anti-seepage. It can better reduce the lateral displacement of the pit wall and the settlement deformation of the surrounding environment.

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...

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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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