Deep foundation pit construction method under complex geological conditions

Abstract

The invention discloses a deep foundation pit construction method under complex geological conditions, relates to the technical field of building construction, and solves the problem that an existing foundation pit supporting method is not safe when being used for construction under the complex geological conditions. According to the technical scheme, the method is used for vertical excavation construction of a deep foundation pit under the geological conditions that the surface layer is backfill, the middle layer is silty clay, the lower layer is medium weathered rock and the water level is high. The method comprises the steps that firstly, drainage ditches are excavated around a deep foundation pit excavation area to drain surface water; secondly, a single row of steel pipe piles are constructed along the excavation boundary of the deep foundation pit, and the portions, exposed out of the ground, of the steel pipe piles are connected through cross rods; thirdly, anchors are constructed outside the excavation range of the deep foundation pit or other fixtures are selected as anchoring points, and the cross rods and the anchoring points are tensioned; and fourthly, precipitation is conducted on the excavation area of the deep foundation pit, the deep foundation pit is excavated in a layered mode, waist beams are installed, anchor pipes are constructed, and concrete retaining walls are constructed; finally, layered excavation and supporting are repeated till the maximum design excavation depth is reached.

Description

technical field [0001] The invention relates to the technical field of building construction, in particular to a construction method for excavating deep foundation pits under complex geological conditions. Background technique [0002] At present, most of the deep foundation pit constructions use methods such as sloping excavation, anchor net sprayed concrete support and so on. When deep foundation pits have rich groundwater and complex geological conditions, conventional methods cannot satisfy the safety of excavation equipment and personnel. [0003] The patent with the notification number CN 111705809 A discloses a deep foundation pit construction structure and a deep foundation pit construction method, wherein the deep foundation pit construction structure includes a retaining wall set up on the side wall of the foundation pit and surrounded by columns, and the lower ends of the columns It is inserted under the bottom surface of the foundation pit, and reinforcement pil...

AI Technical Summary

Problems solved by technology

[0005] The invention provides a deep foundation pit construction method under complex geological conditions, which solves the problem that the existing foundation pit support method is not safe for construction under complex geological conditions

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