Improved construction method of soil mass of extra-large-diameter soil pressure balancing shield on soft soil stratum

A technology of earth pressure balance shield tunneling and ultra-large diameter, which is applied in the direction of earth drilling, mining equipment, tunnels, etc. It can solve the problems of unstable advance speed and delay in the excavation surface, so as to increase the excavation rate, improve plastic flow, Effect of reducing cutter head torque

Active Publication Date: 2010-06-23
SHANGHAI TUNNEL ENG CO LTD
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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a soil improvement construction method for super-large-diameter earth pressure balance shields in soft soil strata, ...

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  • Improved construction method of soil mass of extra-large-diameter soil pressure balancing shield on soft soil stratum
  • Improved construction method of soil mass of extra-large-diameter soil pressure balancing shield on soft soil stratum

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Embodiment Construction

[0019] Such as figure 1 As shown, it discloses a schematic flow chart of the soil improvement construction method of the super-large-diameter earth pressure balance shield in the soft soil stratum provided by the present invention. The implementation steps of the super-large-diameter earth pressure balance shield soil improvement construction method in the soft soil stratum include: Preparation of additives, testing the quality of additives, injecting additives during excavation and mixing and stirring to improve the soil mass. The super-large-diameter earth pressure balance shield soil improvement construction method for soft soil strata is used on super-large-diameter earth pressure balance shields.

[0020] In the step of preparing additives, the additives of foam mixture and bentonite slurry are prepared first, and according to the construction requirements, the control system of the earth pressure balance shield machine controls the foam mixture concentration and foaming r...

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Abstract

The invention relates to an improved construction method of a soil mass of an extra-large-diameter soil pressure balancing shield on a soft soil stratum, which particularly solves the construction travelling problem of the extra-large-diameter soil pressure balancing shield. The improved construction method of the soil mass of the extra-large-diameter soil pressure balancing shield on the soft soil stratum comprises the following steps: adopting foam and bentonite slurry as additives in the tunneling construction process, injecting the additives to different positions of an excavation surface of a cutter, focusing on the foam and controlling the stability of soil pressure, causing bentonite slurry to play a subsidiary role and reducing the excavation strength of the soil mass, simultaneously adopting a central agitator in a soil warehouse to agitate and mix the soil mass and the additives entering into the soil warehouse and further stabilizing the excavation surface, improving the plastic fluidity, reducing the torque of the cutter and improving the tunneling efficiency.

Description

technical field [0001] The invention relates to a soil improvement construction method, especially a tunnel construction technology, which is suitable for super large diameter earth pressure balance shield machine to ensure the soil pressure balance of the soft soil layer with super large diameter earth pressure balance shield soil Improve construction methods. Background technique [0002] The earth pressure balance shield method is widely used in urban rail transit, municipal engineering, water conservancy, power and transportation energy due to its small investment scale, simple construction method, small footprint, small impact on traffic and environment, and easy control of tunneling operations. It is widely used in the field of construction, especially in the dense construction area of ​​the city and the underground tunnel project with heavy ground traffic. [0003] With the continuous development of municipal engineering construction, the requirements for earth press...

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Application Information

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IPC IPC(8): E21D9/06
Inventor 杨磊丁志诚黄德中戴仕敏周隽郑宜枫顾沉颖晁东辉吴惠明王金一周永习郝亮
Owner SHANGHAI TUNNEL ENG CO LTD
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