Concrete support and fish-belly sill combined supporting system of special-shaped foundation pit and construction method

Abstract

The invention relates to a concrete support and fish-belly sill combined supporting system of a special-shaped foundation pit. The system comprises concrete supports, assembled fish-belly sills, section steel diagonal supports, corner supports and middle stand columns, wherein the first pass and the third pass of supports of the foundation pit adopt the concrete supports, and the second pass and the fourth pass of supports adopt the fish-belly sill supports; and the concrete supports and the fish-belly sill supports are vertically connected through steel stand columns in the foundation pit to form a space system. The invention additionally discloses a construction method for the concrete support and fish-belly sill combined supporting system of the special-shaped foundation pit. The construction method comprises the steps of constructing the first pass of concrete supports, roadway slabs and trestle slabs after foundation pit enclosure and stand column piling are completed; after the strength meets the requirement, downwards excavating the foundation pit to the position of the second pass of supports, i.e. the fish-belly sill supports, sequentially installing corbels, brackets, purlins, the corner supports and the fish-belly sills, and finally installing the diagonal supports. The concrete support and fish-belly sill combined supporting system of the special-shaped foundation pit and the construction method provided by the invention have the advantages that the foundation pit is ensured to be safely and quickly constructed; a larger operating space can provided, the speed of installing and removing the supports is fast and the deformation control of the foundation pit is facilitated.

Description

technical field [0001] The invention relates to a foundation pit engineering construction technology, in particular to a combined support system and a construction method of a concrete support and a fish-belly beam for a special-shaped foundation pit. Background technique [0002] With the continuous development and utilization of underground space, civil engineering continues to develop in depth, and a large number of deep foundation pit projects have emerged. In foundation pit engineering, the support system plays an extremely important role in the stability of the foundation pit, construction period and project cost. The current foundation pit support mainly includes concrete support and steel support. Steel pipe support is generally used in regular-shaped foundation pits, and concrete support is generally used as the inner support member in special-shaped foundation pits due to the complex force system. However, the concrete support has slow construction and demolition ...

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Problems solved by technology

[0003] Through searching the existing technology, it is found that the existing patents explain the structure and installation of the fish-belly beam support, and are mainly aimed at the foundation pit of the standard form, and do not support the combined support of the concrete support and the fish-belly beam in the special-shaped foundation pit system for further research and elaboration

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