Subway tunnel shield end reinforcing method

A technology of tunnel shield and end head, which is applied in tunnels, earthwork drilling, infrastructure engineering, etc., can solve the problems of shield starting, construction and reinforcement, etc., to ensure safety and short construction period. , the effect of good uniformity

Inactive Publication Date: 2018-12-07
CHINA RAILWAY NO 3 GRP CO LTD +1
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Problems solved by technology

[0004] There is a water pipe with a diameter of 1.4m at the end of Dazhi Road in the section from Jianghan Road Station to Dazhi Road Station 1.7m below the surface, which crosses the reinforcement area at the end of the shield machine. This area is difficult to reinforce. There are great difficulties in the discovery; there is a light rail pier foundation of Line 1 at a distance of 15m from the end of the shield machine. The pier foundation pile foundation is 3.4m closest to the right line of the shield machine, and 1m to the left line. The pier foundation pile is 52m long and embedded in weathered In the rock, the construction is more difficult

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  • Subway tunnel shield end reinforcing method
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Embodiment Construction

[0032] Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

[0033] see Figure 1-Figure 3 , in an embodiment of the present invention, a subway tunnel shield end reinforcement method, including shield end reinforcement, water supply pipe reinforcement and bridge pier reinforcement, the shield end reinforcement method is divided into origination shaft reinforcement and receiving shaft reinforcement ; The reinforcement method of the originating shaft is to adopt φ800@600 high-pressure jet grouting piles for reinforcement, and the edge of the reinforcement area is constructed with a 1000mm ground connection wall for the reinforcement of the closed end; the reinforcement method of the receiving shaft is to adopt φ800@600 high-pressure jet grouting piles, Among them, the reinforcement length is 9m, the width is 3m extending from the shield hole circle, and the depth range is 3m upward and 3m downward, with strong reinforce...

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Abstract

The invention discloses a subway tunnel shield end reinforcing method. The subway tunnel shield end reinforcing method comprises the following steps of reinforcing the shield end head, reinforcing thewater supply pipe and reinforcing the bridge pier, and the shield end reinforcing method is reinforced by using a high-pressure rotary spraying pile with Phi 800@600, the water supply pipe reinforcement and the bridge pier reinforcement are reinforced through a sleeve valve pipe. The reinforcing method has the advantages that the reinforced soil body has good uniformity, self-supporting propertyand water stopping property, the non-lateral limit compressive strength of the reinforced soil body is not less than 1 Mpa, and the permeability coefficient is less than 1.0*10 <-5> cm / s, no large bump or settlement exists on the ground after the soil body is reinforced, the construction period is short, and the safety of subsequent construction is ensured.

Description

technical field [0001] The invention relates to a method for reinforcing the end of a subway tunnel shield. Background technique [0002] The superiority of underground railway transportation in solving urban traffic problems is very obvious. In recent years, subway construction has been widely spread across the country. In subway construction projects, shield tunneling is widely used as an intelligent construction machine for tunnel construction. During the construction process of the shield tunneling project, accidents such as excessive surface deformation and collapse are prone to occur at the start and reception of the shield tunnel, especially when the reinforcement at the end fails to meet the design requirements or the reinforcement fails, safety accidents are extremely prone to occur. [0003] When the shield machine enters and exits the hole, the working surface will be in an open state, and this open state will last for a long time. If it is not handled properly, ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D5/32E02D15/04E02D7/24E21D9/06
CPCE02D5/32E02D7/24E02D15/04E21D9/06
Inventor 马良潘武占沈福良刘承宏王文博王玉增李航秘江峰何建忠贾刚王颖梅李宁
Owner CHINA RAILWAY NO 3 GRP CO LTD
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