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Construction method of foundation pit support structure under karst and/or fissure development strata

A foundation pit enclosure and construction method technology, which is applied in the direction of foundation structure engineering, excavation, earthwork drilling and mining, etc., to achieve the effects of wide application range, improving the bearing capacity of the base, and ensuring safety

Inactive Publication Date: 2018-01-16
CHINA RAILWAY 16 BUREAU GRP BEIJING METRO ENG CONSTR +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are few construction examples of shield well enclosure structures in strong karst / crack development areas in urban subway construction at home and abroad, and there is no mature technical experience to follow

Method used

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  • Construction method of foundation pit support structure under karst and/or fissure development strata
  • Construction method of foundation pit support structure under karst and/or fissure development strata
  • Construction method of foundation pit support structure under karst and/or fissure development strata

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0088] On-site construction of a shield well (hereinafter referred to as 1# shield well) during a subway construction: The underground three-story single-column double-span box frame structure is adopted, and the open-cut method is used for construction. The length of the foundation pit is 40.2m, the width is 24.3m, and the excavation depth of the foundation pit is 30.621m. The enclosure structure of the foundation pit adopts the enclosure structure of bored piles with a pile diameter of 1.5m and a spacing of 1.7m; the support system adopts two concrete supports and four steel supports, of which the first and fifth supports are concrete supports, and the rest are steel supports. support. The supporting column adopts steel lattice column, and the column foundation adopts rock-socketed pile foundation. In the preliminary survey stage, a half-filled karst cave with a height of 3 to 14.4 meters was found here. Avoid the range of karst caves to carry out the construction of sur...

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Abstract

The invention discloses a construction method of foundation pit support structure under karst and / or fissure development strata, and belongs to the field of rail traffic construction. The constructionmethod of the foundation pit support structure mainly includes the construction steps of advanced drilling, partition drilling, partition grouting, karst cave handling, and fissure handling. By meansof the construction method, accidents like sudden loss of arm protection mud and instability and collapse of a hole wall are not prone to occur, the stability of a foundation pit in an excavation process is good, and the safety of a main structure during the rail traffic operation is guaranteed. The construction method of the foundation pit support structure is easy to construct, low in cost, high in efficiency, convenient to organize, reasonable in procedure, safe and reliable, and wide in application scope.

Description

technical field [0001] The invention belongs to the field of rail transit construction, and in particular relates to a construction method for an enclosure structure, in particular to a construction method for an enclosure structure of a foundation pit under a karst and / or fissure-developed stratum. Background technique [0002] According to previous engineering examples, when karst caves and fissures develop strongly in the formation of shield wells, ground subsidence can be induced in a short time, which will have a negative impact on the uniformity and stability of the foundation, and the engineering properties of karst cave fillings are poor. The original foundation has low bearing capacity. The construction of shield wells in karst strata must not only ensure the safety of the construction itself, but also consider the impact of unavoidable risks such as cracking of ground buildings around the project caused by ground subsidence that may occur during construction on urb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D17/04E02D3/12E21D9/00
Inventor 马栋白枝奉杨公正王起飞闫江涛赵光营陈桐民周平山张士强苗裕田孙立新阎向林吴琼翟志峰庞资峰唐健王昌亚
Owner CHINA RAILWAY 16 BUREAU GRP BEIJING METRO ENG CONSTR
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