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Construction method for preventing roof caving of shield in construction

A construction method and technology in construction, which are applied in the fields of foundation structure engineering, earthwork drilling, field foundation soil survey, etc. Body disturbance and ground deformation, improve the quality of axis control, overcome the effects of poor results

Active Publication Date: 2016-06-08
CHINA RAILWAY 16 BUREAU GRP BEIJING METRO ENG CONSTR +2
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, the protruding positioning pile will inevitably increase the disturbance to the soil, thereby increasing the ground deformation
Moreover, this invention is only applicable to simple formation conditions, and does not consider complex geological conditions, especially the situation that there are many obstacles in the adjacent formations.
Using the method of this invention patent can not solve the problem of shield roof collapse under complex geological conditions and it is difficult to guarantee the construction quality and environmental protection
Therefore, the existing technology has the disadvantages of large soil disturbance, large ground deformation and poor actual effect when preventing the shield machine from falling during the construction process.

Method used

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  • Construction method for preventing roof caving of shield in construction
  • Construction method for preventing roof caving of shield in construction
  • Construction method for preventing roof caving of shield in construction

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Embodiment Construction

[0061] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0062] This embodiment provides a construction method for preventing shield tunnels from roof-falling during construction. It is applied to a straight section of a power cable tunnel with a length of 267m, a longitudinal gradient of 0.56%, and a thickness of 11.93m of soil covering the top of the tunnel pipe section. The soil layer is a muddy silty clay layer, and the jacking force F of the shield acting on the cutter head surface is 500kN; the specific implementation steps of applying a constructi...

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Abstract

The invention provides a construction method for preventing roof caving of a shield in construction. The construction method comprises the steps that 1, stratum investigation is performed along a shield path; 2, a cap peak device is installed on a shield tunneling machine; 4, the cap peak device is applied to shield construction. When the cap peak device is not adopted, the cap peak device is retracted into a cutterhead face through a hydraulic oil cylinder; when the shield enters the roof caving stratum, the cap peak device can stretch out by means of the hydraulic oil cylinder, the stretching-out length can be determined according to the condition of the stratum, and roof caving is prevented according to the stretching-out length of the cap peak. By adopting the construction method, roof caving of the shield on various geological conditions is prevented more easily and conveniently, the axis control quality is improved, and soil body disturbance and ground deformation are reduced.

Description

technical field [0001] The invention relates to a construction method in the technical field of shield tunneling engineering construction, in particular to a construction method for preventing a shield from roof collapse during construction. Background technique [0002] The shield tunneling method has the characteristics of fast excavation speed, small construction impact, and low labor intensity, and is the main construction method for large and medium-sized tunnels. However, due to the complex underground geological conditions, when the forward thrust of the shield machine is greater than the resistance of the soil in front of the shield machine, the roof of the shield machine will fall, which will affect the tunneling direction of the shield machine and increase the disturbance range of the soil. Especially for complex stratum conditions, different soil layers have different cutting difficulties, and it is more difficult to control ground subsidence and deformation. Ther...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D9/08G01N9/36G01N19/00E02D1/02
CPCE02D1/022E21D9/08G01N9/36G01N19/00
Inventor 张伟森赵守宪王耀东吴大勇沈水龙刘晓雪吴怀娜刘元鹏张志坤周全叶华王志新荣浩然滕海波张桂彬
Owner CHINA RAILWAY 16 BUREAU GRP BEIJING METRO ENG CONSTR
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