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Urban shallow buried large-section tunnel five-step excavating method

A technology of extra-large section and initial support, applied in tunnels, temporary shields, blasting, etc., can solve the problems of easy slump on the soft rock layer, large dosage of medicine, large excavation span, etc., to reduce the amount of engineering and the number of procedures. Alternate, improve the overall effect

Inactive Publication Date: 2011-10-19
CHONGQING ZHONGHUAN CONSTR +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] While the five-part excavation method has the above advantages, there are also many problems: (1) The single excavation span is large, and the weak rock layer is easy to collapse
(2) The amount of medicine used in one blasting is large

Method used

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  • Urban shallow buried large-section tunnel five-step excavating method
  • Urban shallow buried large-section tunnel five-step excavating method
  • Urban shallow buried large-section tunnel five-step excavating method

Examples

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Embodiment Construction

[0010] In conjunction with accompanying drawing, the present invention is described in further detail by example:

[0011] see figure 1 , figure 2 , the tunnel that the present invention relates to is made up of following part in the implementation: go up the excavation of 1 part of rock mass on the left side wall of the pilot pit, the initial support I of this part left side, the temporary support I ' of the upper pilot pit side wall on the left side; Excavation of 2 rock masses on the right side wall of the pilot pit, primary support II on the right side of this part, temporary support of the middle wall; excavation of 3 rock masses on the left side wall of the lower pilot pit, initial support III on the left side of this part, middle wall Temporary support III'; excavation of 4 rock masses on the right side wall of the lower pilot pit, initial support IV on the right side of the part, and temporary support IV' of the middle wall; remove the temporary support of side walls...

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PUM

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Abstract

The invention relates to urban shallow buried large-section tunnel excavating. The excavating sectional area of a tunnel is 311.436m2, the width is 23.7m, the height is 16.224m, and the hole striding ratio is 0.454. The whole section is divided into five construction component parts which are implemented in sequence, and as for the excavating method, characteristics of a CD excavating method and a double side wall pit guiding method are combined, and a secondary lining early application is realized by taking blasting influence reduction and initial-stage support improvement as main means. Themethod has the advantages that the disturbance influence on wall rocks by the large-section tunnel five-step excavating blasting technology is less than that in the prior art, the wall converge deformation restraining capability of surrounding rocks is improved, the whole performance of the initial-stage support is improved, and the operating efficiency is improved by reducing working procedure alternation.

Description

technical field [0001] The patent of the present invention relates to the technical field of urban rail transit engineering, specifically a method for excavating urban shallow-buried large-section tunnels Background technique [0002] Along with the pace of my country's development of large and medium-sized urban rail transit is accelerating day by day, lines such as urban light rail and subway often encounter urban shallow buried tunnels that need to pass through buildings (structures). Some sections of lines intersect and converge to form super-large-section tunnels, and the rock mass blasting and settlement deformation of large-section tunnels have a greater impact on the superstructure. At present, the design of large sections is divided into multiple constructions. The more advanced construction methods are nine-part excavation and seven-part excavation. The integrity of the initial support is poor, and repeated disturbances cause the overall subsidence of the tunnel va...

Claims

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Application Information

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IPC IPC(8): E21D9/00E21D19/04F42D3/04
Inventor 李俊松李永强吴怀林袁世勇陈自杰杨航蓝必冠陈哲周世均
Owner CHONGQING ZHONGHUAN CONSTR
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