Construction method of combined support for deep foundation pit with high water level and large particle size sand and gravel

Abstract

The invention discloses a deep foundation pit combination supporting construction method for geology with high water level and large particle size sand gravel. High pressure jet grouting pile construction is conducted outside a foundation ditch retaining and protecting system, by means of a triple placing method, cement paste is injected into underground soil filling layer and sand gravel gaps, after solidifying, secant pile wall and retention wall are formed, the underground water is prevented outside the periphery the foundation ditch retaining and protecting system, and conditions are created for the construction of a support pile; when the strength of outer side jet grouting pile meets design requirements, a long auger drilling cast-in place pile begin to be constructed close to the inner side of the jet grouting pile; after perfusion pile beings maintained for 15 days, jet grouting pile construction begins to conduct to make up partial failure of waterproof curtain of the jet grouting pile in construction of retaining and protecting pile, and retaining and protecting strength and water interception effect of the retaining and protecting system are increased; at last, in an earth excavation process, bar-mat reinforcement sprayed concrete slope protection and construction of dewatering well, open trench and water-collecting well in the foundation ditch are completed well, multiple retaining and protecting forms are used for combining construction and interaction. Accordingly, the problems of retaining and protecting the geology with high water level and large particle size sand gravel and processing the geology are solved.

Description

technical field [0001] The invention relates to the field of building construction, in particular to a combined support construction method for geological deep foundation pits with high water level and large particle size gravel. Background technique [0002] With the rapid development of my country's economy, land resources are becoming more and more scarce, and construction projects are increasingly developing towards underground space. It is inevitable that they will encounter complex geological environments. Adjacent to the building, the effective support of the foundation pit will be related to the safety, quality and progress of the project construction, and it is also the key to ensure that the foundation of the surrounding original buildings does not settle. Due to the high groundwater level, large water volume, and large content of sand and gravel, the optional The support forms are limited, and it is found through experimental research that under this geological cond...

AI Technical Summary

Problems solved by technology

[0003] In order to make up for the problems in the prior art, the present invention provides a combined support construction method for geological deep foundation pits with high water level and large particle size sand and gravel, using multiple support forms for combined construction and interaction to solve the problem of high water level and large particle size sand and gravel Difficulties in the support of geological foundation pits and the treatment of foundations

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