Construction method for deep and thick soft soil foundation pit

Abstract

The invention belongs to the technical field of building construction, and particularly relates to a construction method for a deep and thick soft soil foundation pit. The supporting device adopted in the construction method for the deep and thick soft soil foundation pit comprises a fixing base, first air cylinders, supporting bases, a supporting plate, second air cylinders and supporting rods, wherein the first air cylinders are evenly arranged on the two sides of the fixing base, and the supporting bases are symmetrically installed on the two sides of the fixing base. According to the construction method for the deep and thick soft soil foundation pit, the fixing base is installed in the middle of the bottom of the foundation pit, so that the supporting plate on the supporting bases makes contact with the side face of the foundation pit, loose soil on the side face of the foundation pit is compacted, and the situation that the two sides of the foundation pit collapse, a large amount of soil rushes into the bottom of the foundation pit, and consequently the excavation progress of the foundation pit is affected in the construction process is avoided; an alarm in the supporting device can give an alarm in time before collapse danger occurs, constructors are notified to take refuge in time, casualties are reduced, and therefore it is guaranteed that the foundation pit and the constructors in the foundation pit are effectively protected.

Description

technical field [0001] The invention belongs to the technical field of building construction, in particular to a construction method for deep soft soil foundation pits. Background technique [0002] With the development of the economy and the acceleration of urbanization, in cities where land is increasingly tight, it has become inevitable to develop underground space in combination with urban construction and renovation, such as multi-storey basements of high-rise buildings, subways, underground passages, underground parking garages, and underground shopping malls. , underground substations, underground warehouses, underground residential construction and various underground civil and public facilities, etc., in the process of development and utilization of underground space, deep foundation pit engineering has become an indispensable project. [0003] However, during the construction of deep foundation pits, soft soil foundations are often encountered. Because soft soil fo...

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Problems solved by technology

[0003] However, during the construction of deep foundation pits, soft soil foundations are often encountered. Because soft soil foundations have high natural water content, large void ratio, high compressibility, low shear strength, small consolidation coefficient, long consolidation time, Due to the characteristics of poor water permeability, complex layered distribution of soil layers, and large differences in physical and mechanical properties between layers, the bearing capacity of the foundation is generally low, and the overall stability is poor. A collapse occurred, causing a large amount of floating soil to pour into the bottom of the foundation pit, which affected the construction of the foundation pit

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