Construction method and system for improving secondary grouting quality used for shield construction

A technology of secondary grouting and construction method, which is applied in earth-moving drilling, wellbore lining, tunnel lining, etc., can solve the problems of easy blockage of grouting pipes and tee fittings, unstable sealing effect of secondary grouting, etc.

Active Publication Date: 2016-06-15
CHINA RAILWAY 16 BUREAU GRP BEIJING METRO ENG CONSTR +2
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Problems solved by technology

[0004] In view of the defects in the prior art, the object of the present invention is to provide a construction method and system for improving the quality of secondary grouting in shield tunneling construction, which overcomes the secondary grouting pressure e...

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  • Construction method and system for improving secondary grouting quality used for shield construction
  • Construction method and system for improving secondary grouting quality used for shield construction
  • Construction method and system for improving secondary grouting quality used for shield construction

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Embodiment

[0077] In a subway tunnel project constructed by shield tunneling method in Panyu District, Guangzhou City, Guangdong Province, the diameter of the tunnel is 6m, and a second grouting is required for a certain part of the tunnel. This embodiment provides a construction method for improving the quality of secondary grouting in shield tunneling construction. The specific construction steps of the construction method are as follows:

[0078] Step 1. Determine the geological conditions of the construction site:

[0079] Consult the geological survey report, and determine that the stratum around the grouting position is divided into 2 layers, the first layer is clay layer, and the effective gravity γ 1 20kN / m 3 , thickness h 1 The second layer is medium weathered granite, the surrounding rock grade is IV, and the thickness of the surrounding rock above the grouting position is h 2 5m, surrounding rock weight γ 2 25kN / m 3 , groundwater initial water table depth H w is 1m, grou...

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Abstract

The invention provides a construction method and system for improving secondary grouting quality used for shield construction. The method comprises following steps: firstly, determining a geological condition of a construction site; secondly, determining partitions of grouting slurries in order to carry out slurry performance; thirdly, determining grouting pressure P and grouting amount Q; fourthly, opening a grouting hole and connecting with a semi-automatic grouting platform car system; fifthly, preparing grouting slurries via the semi-automatic grouting platform car system to carry out secondary grouting; and sixthly, flushing a grouting pipe and a Y-shaped three-way pipe fitting. The construction method and system for improving secondary grouting quality used for shield construction has following beneficial effects: by depending on the semi-automatic grouting platform car system, the automatic stirring function of cement grout and water glass slurries and the semi-automatic adding function of grouting material are fulfilled; therefore labor and time of secondary grouting are effectively saved; precision of grouting slurry blending is increased; and uniformity and grouting efficiency of grouting slurries are enhanced.

Description

technical field [0001] The invention relates to a construction technology in the technical field of underground construction engineering, in particular to a construction method and system for improving the quality of secondary grouting in shield construction. Background technique [0002] The shield method is a commonly used construction method in tunnel engineering. The shield method is a construction method in which the cutter head of the shield machine is used to cut the soil in the stratum, and the cut muck is transported out of the tunnel, while the shield machine is pushed forward to achieve the purpose of tunnel excavation. When the shield machine is moving forward, the segments at the tail of the shield gradually break away from the shield body, leaving a gap between the segment and the formation, so the gap needs to be sealed by grouting technology. Synchronous grouting is the synchronous grouting into the void during the forward advancement of the tunnel. When the...

Claims

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Application Information

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IPC IPC(8): E21D11/10
CPCE21D11/105
Inventor 张健武铁路蔡连利刘永沈水龙张宁顾长明王涛白艳峰杨成郝钢胡俊杰赵阳宿伟华有岳熊涛李永刚杜昌亮
Owner CHINA RAILWAY 16 BUREAU GRP BEIJING METRO ENG CONSTR
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