Ultra-deep foundation pit supporting method

Abstract

The invention relates to an ultra-deep foundation pit supporting method which comprises a single-row triaxial deep-mixing pile water-stop curtain, bored piles and upright steel posts, wherein the single-row triaxial deep-mixing pile water-stop curtain is lower than natural ground and is arranged along the periphery of a foundation pit in an enclosing way; the bored piles are sequentially arranged at intervals in the foundation pit and located on the inner side of the single-row triaxial deep-mixing pile water-stop curtain; the upright steel posts are arranged in the foundation pit and located on the inner sides of the bored piles; the tops of the bored piles are sequentially connected via reinforced concrete crown beams in a pulling way; reinforced concrete enclosing purlins along the periphery of the foundation pit are arranged in positions, which are not the height positions of floor slabs of underground floors, on the inner sides of the bored piles; the inner sides of the reinforced concrete enclosing purlins are connected in a pulling way via reinforced concrete enclosing purlin beams supported on the upright steel posts; the reinforced concrete enclosing purlin beams are in latticed pulling connection with the reinforced concrete enclosing purlins via a plurality of groups of inner reinforced concrete supports; filling plain concrete is arranged inwards at the bottoms of the bored piles; a baseplate is laid on the foundation pit and enclosed by the filling plain concrete; and more than one post-cast strip with support replacement pieces is arranged on the baseplate.

Description

technical field [0001] The invention relates to a foundation pit support method, in particular to an ultra-deep foundation pit support method. Background technique [0002] The foundation pit is a temporary project, and its function is to provide a space so that the foundation masonry can be carried out according to the position specified by the design. In order to ensure the safety of the underground structure construction and the surrounding environment of the foundation pit, it is usually necessary to adopt support and reinforcement foundation pit support measures for the side walls of the foundation pit and the surrounding environment. [0003] With the development of economic construction, there are more and more large-scale projects such as super high-rise buildings and urban complex buildings. These large-scale projects not only have a large area and height of the above-ground part, but also generally have a larger area and depth of the underground part. They are all...

AI Technical Summary

Problems solved by technology

[0004]Aiming at the problem that the deep foundation pit support in the prior art cannot meet the needs of ultra-deep foundation pits, the present invention provides a simple and firm structure and convenient construction. Ultra-deep foundation pit support method with high support performance and convenient excavation of foundation pit

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