Pre-reinforcement structure for construction of underground diaphragm wall in alluvial layer and construction method

Abstract

The invention relates to a pre-reinforcement structure for construction of a diaphragm wall in an alluvial layer and a construction method, and belongs to the technical field of construction of underground diaphragm walls. The pre-reinforcement structure for the construction of the diaphragm wall in the alluvial layer comprises the underground diaphragm wall and guide walls oppositely arranged along the axis of the underground diaphragm wall; and a plurality of uniformly-arranged dense and closed row piles are arranged below the guide walls along the central axes of the guide walls, the dense and closed row piles and the guide walls are integrally poured, and the plurality of dense and closed row piles form a row pile wall. The construction method of the pre-reinforcement structure for the construction of the diaphragm wall in the alluvial layer comprises seven steps of stratum pre-judgment and reinforcement depth determination, technical preparation, construction preparation, drilling, drilling-spraying integrated pile forming, pile top chiseling away, pouring and backfilling and tamping. According to the pre-reinforcement structure for the construction of the diaphragm wall in the alluvial layer and the construction method, the safe, efficient and environment-friendly construction of the underground diaphragm wall can be ensured, accidents such as groove wall collapse, slurry leakage and piping in the construction of the underground diaphragm wall can be prevented and reduced, resource waste is reduced, and the construction cost is saved on.

Description

technical field [0001] The invention belongs to the technical field of underground diaphragm wall construction, and relates to an underground diaphragm wall construction pre-reinforcement structure in deep foundation pit anti-seepage body engineering, in particular to an underground diaphragm wall construction pre-reinforcement structure in alluvial layers and a construction method. Background technique [0002] Deep and large foundation pits are developed along with the construction of modern large-scale foundation projects. At present, in the construction of deep and large foundation pits in various countries, the underground diaphragm wall construction method has been widely used in water conservancy, hydropower, mining, construction, urban subways, disaster reduction and prevention, environmental protection and other fields, and has achieved remarkable social and economic benefits. However, in the construction of underground diaphragm walls, complex alluvium strata are o...

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Problems solved by technology

[0005] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a structure and construction method that can ensure the safe, efficient and environmentally friendly construction of the underground diaphragm wall, which is used to solve the problem of ultra-thick and ultra-deep underground diaphragm walls in the prior art. Water liquefaction, grout loss, tank wall easy to collapse and other technical problems in alluvium and other complex formations, such as underground diaphragm wall construction, can easily cause hole wall instability and collapse, solid wall grout loss, guide groove collapse, equipment overturning and other accidents

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