Dense cast-in-place pile inner support foundation pit permanent support structure under complicated environment

Abstract

The invention discloses a dense cast-in-place pile inner support foundation pit permanent support structure under a complicated environment. The structure comprises a first high-pressure jet groutingpile, cast-in-place piles, a second high-pressure jet grouting pile, a concrete hanging net, crown beams, inner supports, a gravel cushion layer, a reinforced concrete base plate and a foundation soilbody; the first high-pressure jet grouting pile is vertically arranged in the foundation soil body at the bottom of a foundation pit to form a composite foundation; the gravel cushion layer is pavedon the composite foundation; the reinforced concrete base plate is above the gravel cushion layer; the cast-in-place piles adopt reinforced concrete structures, and are vertically arranged in the foundation soil body; one sides of the cast-in-place piles on the outer side of the foundation pit are connected through the second high-pressure jet grouting pile, and the other sides of the cast-in-place piles on the inner side of the foundation pit are connected as a whole by adopting the concrete hanging net; the tops of the cast-in-place piles are connected as a whole through the crown beams; thecrown beams on two sides of the foundation pit are connected with the inner supports; reinforcements of the inner supports extend into the crown beams, and are connected with reinforcements of the crown beams; and concrete is cast as a whole. The structure can improve the foundation bearing capacity, and is low in engineering construction cost and excellent in reinforcing effect.

Description

technical field [0001] The invention belongs to the field of support for foundation pits of water transport engineering, in particular to a permanent support structure for inner support foundation pits of close-row cast-in-place piles in a complex environment. Background technique [0002] With the development of urban construction, underground space has been developed and utilized in major cities, such as underground parking lots, underground civil air defense projects, underground commercial streets, subways, cross-river and submarine tunnels, etc. The construction of underground buildings (structures) is booming. As a result, a large number of complex and diverse foundation pit projects have been produced. In the development and construction of these underground spaces and facilities, especially in soft soil areas, the requirements for foundation pit engineering are getting higher and higher, and there are more and more problems that arise, and many new theoretical resear...

AI Technical Summary

Problems solved by technology

Moreover, most of the existing foundation pit support projects are temporary support projects, and the support timeliness is short, and when the foundation pit support project is used as a permanent support project, it has a greater impact on the overall stability

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