Bottom channel inner support of foundation pit supporting structure

Abstract

The invention discloses a bottom channel inner support of a foundation pit supporting structure. The bottom channel inner support comprises a plurality of inner supports (1) which are positioned on the bottommost layer and have the same elevation, wherein four sides of a node area of each inner support (1) are provided with annular concrete bosses (2) which protrude the four sides; a circle of water stop steel plate (3) is anchored on the concrete bosses (2) and protrudes four sides of the concrete bosses (2); and a plurality of horizontal connecting steel bars (6) and a plurality of verticalconnecting steel bars (7) which protrude each inner support (1) are embedded into each inner support. The bottom channel inner support of the foundation pit supporting structure can be poured and tamped in a basement bottom plate.

Description

technical field [0001] The invention relates to a structure in construction engineering, in particular to an inner support in a bottom channel of a support structure for a foundation pit, especially an ultra-deep large-scale foundation pit (with a depth exceeding 16 meters). Background technique [0002] With the development of economy, land resources tend to be tense. Construction projects, especially construction projects in prosperous areas of the city, have begun to develop and utilize underground space on a large scale. The depth of foundation pit excavation is getting deeper and deeper, and the depth of many large buildings such as subway stations and buildings with three or four basements exceeds 16 meters. The greater the excavation depth of the foundation pit, the higher the requirements for the foundation pit support structure. The foundation pit support structure in the prior art includes a retaining pile wall arranged on the edge of the foundation pit and one o...

AI Technical Summary

Problems solved by technology

[0004] However, in the actual construction process, there are two technical problems: first, because the actual construction process is to pour the inner support of the bottom channel first, and then continue to dig to the bottom of the pit after the internal support strength meets the requirements, and then pour the basement floor, that is, the inner support of the bottom channel The support and the bottom plate are poured in stages, so that construction joints will be formed between the concrete of the bottom plate and the inner support concrete, that is, construction joints will be formed around the inner support, and the groundwater outside the pit will use the construction joints as leakage channels to penetrate into the basement floor and corrode the bottom plate The steel bars in the basement may even cause cracks in the bottom slab; secondly, because the inner support and the bottom slab are poured in stages, after the inner support is poured, it will inevitably cut off the vertical and horizontal reinforcement of the basement floor, reducing the strength of the basement floor; To sum up, in the actual construction, the inner support of the underpass in the prior art cannot be poured together with the basement floor, but is 1m higher than the top surface of the basement floor

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