Construction method for earth pressure balance shield construction pressure launching in subway tunnel engineering

A technology of tunnel engineering and earth pressure balance, applied in tunnels, earthwork drilling, mining equipment, etc., can solve the problems of high construction cost, long construction period, and large dependence on auxiliary construction methods, so as to ensure airtightness and reduce construction Construction period and cost, the effect of rapid pressure building tunneling

Inactive Publication Date: 2016-08-03
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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Problems solved by technology

The starting link of shield tunneling relies heavily on auxiliary construction methods. At first, chemical grouting was mainly used to strengthen the formation. Now it has gradually developed into safe and convenient construction methods such as high-pressure rotary jet grouting, deep stirring grouting, and freezing method. The ideal state of earth pressure balance for shield tunneling cannot be achieved as soon as possible
Late...

Method used

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  • Construction method for earth pressure balance shield construction pressure launching in subway tunnel engineering
  • Construction method for earth pressure balance shield construction pressure launching in subway tunnel engineering
  • Construction method for earth pressure balance shield construction pressure launching in subway tunnel engineering

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Embodiment

[0052] Such as Figure 1 to Figure 4 As shown, this embodiment provides a construction method for the construction pressure initiation of the earth pressure balance shield in a subway tunnel project, which specifically includes the following steps:

[0053] (A) Carry out pipe shed grouting reinforcement and ground drilling grouting reinforcement for the starting section, the water level before starting is lowered to 1m below the bottom of the tunnel and is stable, and pre-reinforcement is carried out for the crossing structures;

[0054] (B) Determine the spatial position of the starting posture of the shield according to the tunnel design axis, and then deduce the spatial position of the starting platform in reverse. Refer to figure 1 According to the size of the curve section, the tangent starting method is adopted, the installation elevation of the starting bracket is raised by 2cm, and the relative anti-rotation support is welded on the starting platform and the shield mac...

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Abstract

The invention provides a construction method for earth pressure balance shield construction pressure launching in subway tunnel engineering. According to the method, a tunnel portal extending ring is matched with rubberized cord fabric, a folding pressure plate and a spring steel plate dual-sealing device to maintain pressure, and replacement is carried out on in-bin residue earth of a launching ring during trial boring launching. According to the method, pressure can be built quickly and normally to reach earth pressure balance tunneling requirements by replacing the in-bin residue earth of the launching ring when the launching ring excavates during the shield launching, water burst risk and sand burst risk generated by directly breaking a tunnel portal are avoided, the construction period is shortened and the construction cost is reduced. According to the shield tunnel construction pressure launching construction method, the risk increased by directly breaking the tunnel portal can be avoided, the leakproofness of the tunnel portal can be ensured, construction pressure excavation can be quickly realized, cost is saved, and the construction safety of the shield tunnel can be guaranteed.

Description

technical field [0001] The invention belongs to the field of urban rail transit engineering construction, and relates to subway tunnel engineering, in particular to a construction method for constructing pressure origination of earth pressure balance shields in subway tunnel engineering. Background technique [0002] At present, experts and scholars at home and abroad have made many achievements in the construction technology of shield tunneling. The starting link of shield tunneling relies heavily on auxiliary construction methods. At first, chemical grouting was mainly used to strengthen the formation. Now it has gradually developed into safe and convenient construction methods such as high-pressure rotary jet grouting, deep stirring grouting, and freezing method. The ideal state of earth pressure balance in shield tunneling construction cannot be achieved as early as possible. Later, in the deep buried tunnel projects such as crossing rivers and rivers, the construction ...

Claims

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Application Information

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IPC IPC(8): E21D9/06
CPCE21D9/06E21D9/0607
Inventor 胡长明张延杰刘政张珊珊叶正武袁一力
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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