Deep foundation pit combination retaining and protecting construction method for geology with high water level and large particle size sand gravel

A construction method and a technology with large particle size, which are used in infrastructure engineering, excavation, sheet pile walls, etc.

Active Publication Date: 2015-05-20
HEFEI CONSTR ENG GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to make up for the existing technical problems, the present invention provides a combined support construction method for geological deep foundation pits with large water level and large particle size sand and gravel

Method used

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  • Deep foundation pit combination retaining and protecting construction method for geology with high water level and large particle size sand gravel
  • Deep foundation pit combination retaining and protecting construction method for geology with high water level and large particle size sand gravel

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Embodiment Construction

[0091] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention can be implemented in many different ways defined and covered by the claims.

[0092] Such as figure 1 As shown, the present invention provides a kind of high water level large particle size gravel geological deep foundation pit composite support construction method, comprising the following steps:

[0093] 1.1 Construction preparation

[0094] Study the geotechnical engineering investigation report of the construction area, understand the structure, change and distribution of the soil layer, as well as the physical and mechanical performance indicators (natural bulk density, natural water content, void ratio, permeability coefficient, compressive modulus, cohesion, internal friction angle, etc. ); groundwater aquifers and water-resisting layers, buried depth and distribution, as well as the recharge conditions of each aquife...

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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...

Claims

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Application Information

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IPC IPC(8): E02D17/04E02D5/46
CPCE02D5/46E02D17/04
Inventor 常登荣涂刚要陈玉超李新徐飞刘鑫
Owner HEFEI CONSTR ENG GRP
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