Construction method of strong permeable layer foundation pit supporting anti-seepage composite structure

Abstract

The invention discloses a construction method of a strong permeable layer foundation pit supporting anti-seepage composite structure, which comprises the following steps: firstly, constructing a double-wheel milling cement soil anti-seepage wall, and inserting I-shaped steel into the double-wheel milling cement soil anti-seepage wall to form a composite vertical supporting structure; then, a first ring beam is poured and constructed on the top of the double-wheel milling cemented soil diaphragm wall, a first layer of horizontal supports are arranged on the first ring beam, then a foundation pit is excavated, in the excavation process of the foundation pit, a next ring beam is constructed on the inner wall of the double-wheel milling cemented soil diaphragm wall every certain depth, and horizontal supports are arranged on each ring beam; vertical connecting beams are constructed between the upper and lower adjacent ring beams; after excavation is conducted to the bottom of the foundation pit, a foundation pit floor is poured, a vertical supporting beam is constructed between the foundation pit floor and the last ring beam, and then basement construction is conducted; and dismantling each layer of horizontal support step by step from bottom to top according to the underground structure construction progress. By means of the method, the foundation pit of the strong permeable layer foundation can be effectively supported, and the safety of the foundation pit excavation and underground structure construction process is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of foundation pit support, and in particular relates to a construction method of a foundation pit support and anti-seepage composite structure for a foundation with a strong permeable layer. Background technique [0002] The foundation pit support structure system generally includes two parts, namely the soil retaining structure and the precipitation and water stop system. Pile and wall support structures often use steel sheet piles, reinforced concrete sheet piles, column-type cast-in-place piles, and underground diaphragm walls. According to soil conditions and the scale of the foundation pit, it can be designed as cantilever type, internal support type or anchor pull type. Gravity support structures mostly use cement-soil mixing pile retaining walls, soil-nail walls, etc. When the supporting structure cannot function as a water stop, a water stop curtain can be set at the same time or a precipitation ou...

AI Technical Summary

Problems solved by technology

When the soil condition is good, the use of cement-soil mixing process is limited

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