Combined foundation pit supporting structure and construction method thereof

Abstract

The invention discloses a combined foundation pit supporting structure and a construction method thereof, and belongs to the technical field of civil engineering. The foundation pit supporting structure comprises cement soil mixing piles arranged at the outer side of a foundation pit excavation face, rib bodies, reinforcing mesh and a concrete layer. The rib bodies are arranged between the foundation pit excavation face and the cement soil mixing piles, one ends of the rib bodies are anchored in the cement soil mixing piles, and the other ends of the rib bodies are anchored on the foundation pit excavation face; the reinforcing mesh is arranged on the foundation pit excavation face, and the ends, located on the foundation pit excavation face, of the rib bodies are connected with the reinforcing mesh through reinforcing ribs; and the concrete layer is positioned on the surface of the reinforcing mesh. The invention further discloses a construction method of the combined foundation pit supporting structure, the foundation pit supporting structure is water-isolated and waterproof, meanwhile, the strength characteristic of the cement mixing pile waterproof curtain can be brought into full play, and the anchoring effect on the foundation pit supporting structure is more reliable. More importantly, due to the good anchoring effect of the cement soil mixing piles, the length of a ribbody material can be greatly reduced, and the rib body material is limited from the excavation face of the foundation pit excavation face to the interior of the cement soil mixing piles.

Description

technical field [0001] The invention relates to the technical field of civil engineering, in particular to a combined foundation pit support structure and a construction method thereof. Background technique [0002] In the design of foundation pit support in water-rich strata, cement-soil mixing piles are usually used as water-stop curtains to isolate the groundwater connection inside and outside the foundation pit, so as to facilitate the excavation of the foundation pit. In fact, in addition to the water-repelling effect, the cement-soil mixing pile itself has relatively good mechanical properties, especially in sandy soil layers, and its unconfined compressive strength is generally close to 4MPa, far exceeding that of natural soil. Therefore, in the current foundation pit support design, it is a pity that only the water-proof performance of the cement-soil mixing pile is used without giving full play to its high load-bearing characteristics, which will cause waste of mate...

AI Technical Summary

Problems solved by technology

However, this method needs to set up a corresponding pile row structure on the excavation surface, and the cement-soil mixing pile needs to be additionally set up separately, which does not fully utilize the strength characteristics of the water-stop curtain itself, so its engineering cost is still high

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