Foundation pit with non-first level struts with dynamic stress adjusting function and construction method

Abstract

The invention discloses a foundation pit with non-first level struts with the dynamic stress adjusting function and a construction method. The foundation pit comprises a plurality of internal struts;stress adjusting devices are arranged at the positions, close to the middle positions, of the internal struts; each stress adjusting device comprises an outer cantilevered supporting plate, sliding plate supporting bases and jacks; each outer cantilevered supporting plate comprises a connecting part and a plate-shaped supporting plate body, wherein the connecting part is fixedly connected to the upper end of a corresponding steel stand column; the sliding plate supporting bases are arranged on the positions, corresponding to the disconnected inner supports, of the upper surfaces of the supporting plate bodies and are used for supporting the internal supports; the jacks are arranged at the disconnection positions of the internal supports; and in the construction process, after the steel stand columns are arranged, excavation is carried out to the corresponding positions of the internal struts, the outer cantilevered supporting plates and the sliding plate supporting bases are arranged on the side surfaces of the top ends of the internal struts, when the internal struts are poured, the internal struts are disconnected, pre-embedded steel plates are arranged on the disconnection surfaces, and after the internal struts are completed, the jacks are arranged at the disconnection positions of the internal struts. According to the foundation pit and the construction method, the defectsof the internal concrete supports in the aspect of environmental protection and control can be overcome, and meanwhile, the adverse effect caused by shrinkage of the concrete supports in the super-large foundation pit can be compensated.

Description

technical field [0001] The invention relates to the technical field of foundation pit construction, in particular to a foundation pit with a non-first support with a dynamic stress adjustment function and a construction method. Background technique [0002] In recent years, with the rapid development of urban development and construction, the scarcity of urban space and land resources has become increasingly prominent, especially in large and medium-sized cities with developed economies and heavy traffic, including underground space complexes, subway stations, underground garages, underground The construction of various underground spaces including substations, underground pumping stations, civil air defense projects, and street crossing tunnels is in full swing. The foundation pit engineering corresponding to the construction of underground space is facing four major trends: large-scale plane, deep excavation depth, narrow construction site, and close distance to surroundin...

AI Technical Summary

Problems solved by technology

However, the non-primary concrete support is deep in the support position, bears a lot of earth pressure, and has a long construction time. In addition, the current non-primary concrete support cannot apply adjustable dynamic stress through the active joint and the jack like the steel support. Instead, the enclosure structure of the foundation pit can only be deformed and compressed inwards first, and then the concrete support can passively bear the transmitted earth pressure.

In this way, not only the effect of controlling the impact on the surrounding environment is sacrificed to a certain extent, but also when an alarm occurs in the foundation pit, it is impossible to intervene in the danger control through the measures taken for the support

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