Device and method for improving supporting effect of excavation face of earth pressure balance type tunnel boring machine

A technology of tunnel boring machine and earth pressure balance, which is applied in the direction of tunnels, tunnel linings, earthwork drilling and mining, etc. It can solve problems such as loss of property and life, damage of surface buildings, and impact on project quality, so as to improve, safe and stable development. Excavation surface, the effect of simple principle

Pending Publication Date: 2021-08-03
STATE KEY LAB OF SHIELD & TUNNELING TECH +1
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Problems solved by technology

When the gas pressure in the cavity is lower than the groundwater pressure at the same height of the excavation surface, the groundwater will infiltrate into the soil bin, and the soil mass on the excavation surface will also undergo large deformation, which will eventually lead t

Method used

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  • Device and method for improving supporting effect of excavation face of earth pressure balance type tunnel boring machine
  • Device and method for improving supporting effect of excavation face of earth pressure balance type tunnel boring machine

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[0016] The present invention will be further described in detail below with reference to the accompanying drawings.

[0017] refer to figure 1 and figure 2 For the disclosure of the present invention, a device that improves the opening of the soil-pressure balanced tunnel excavation machine, including the exhaust system and the grouting system, the exhaust system includes the highest place in the interior of the shield machine Tool 10, respectively. The exhaust pipe 2 and the pressure sensor 1 on the shield shell 12 are respectively disposed at the exhaust pipe 2 to extend the gas flow meter 3 and the electric regulating valve 4 on the outer tubular body of the soil wall 11. The pressure sensor 1 is used to monitor the soil pressure or gas pressure at the top of the soil warehouse 10. An exhaust hole 14 is provided at the exhaust pipe 2 on the tube section of the inner portion of the soil warehouse 10, and the opening of the exhaust hole 14 is provided downward. The electric regul...

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Abstract

The invention relates to a device and method for improving the supporting effect of an excavation face of an earth pressure balance type tunnel boring machine. The device comprises an exhaust system, a grouting system and an industrial personal computer; the method comprises the following steps that during a shutdown period of a shield tunneling machine, gas pressure P1 in a soil bin is measured through a pressure sensor, meanwhile, the industrial personal computer obtains underground water pressure P2 at the same height, and if P1 is larger than or equal to P2, exhaust and grouting operation does not need to be conducted; if P1 is smaller than P2, the exhaust system is controlled by the industrial personal computer to exhaust gas until gas in the soil bin is completely exhausted; after exhaust is stopped, the grouting system is started through the industrial personal computer, the grouting pressure is set to be P2, the change of the monitored value P1 is observed during grouting, and when the monitored value P1 of the pressure sensor is equal to P2, the grouting system is closed; and after shutdown, P1 and P2 are compared once every 1 h, and when P1 is smaller than P2, the steps S2-S3 are repeated. According to the device and the method, the exhaust system and the grouting system are additionally arranged, operation is convenient, and the construction quality and safety can be effectively improved.

Description

technical field [0001] The invention relates to the technical field of mechanized tunnel excavation construction, in particular to a device and method for improving the excavation face support effect of an earth pressure balance type tunnel boring machine. Background technique [0002] During the construction process of the earth pressure balance tunnel boring machine, the improved muck is used to support and control the deformation of the excavation surface. Foam agent is one of the most commonly used muck modifiers. The foaming agent is mixed with pressurized air to produce a large amount of uniform and stable foam. The foam evenly fills the pores between soil particles under the agitation of the cutter head, which can effectively reduce the internal friction angle of the muck and improve the flow plasticity of the improved muck. But the foam will gradually dissipate with time, and the density of the gas produced after dissipation is much smaller than that of the improved ...

Claims

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Application Information

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IPC IPC(8): E21D9/06E21D9/093E21D9/00E21D11/10
CPCE21D9/0607E21D9/093E21D9/003E21D11/105
Inventor 王发民刘常利崔天麟曾垂刚张兵张浩张占胜周建军李凤远范文超李帅远赵海雷王利明吕乾乾
Owner STATE KEY LAB OF SHIELD & TUNNELING TECH
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