Tunnel face breast wall filter cake construction process for shield compressed air operations

Abstract

The invention discloses a tunnel face breast wall filter cake construction process for shield compressed air operations. The process includes the steps of 1, preparing for construction, namely connecting an injection system with a plurality of injection holes through an injection pipeline, which are arranged on the outer wall of the upper middle of an earth bin of a shield machine in the peripheral direction; 2, cleaning the bin, namely cleaning the earth bin of the shield machine by a screw conveyer and the injection system; 3, performing graded pressurization, namely performing graded pressurization, including primary pressurization, secondary pressurization, tertiary pressurization and quaternary pressurization, on the inside of the earth bin by the injection system; 4, performing air replacement, namely shutting down the injection system, and replacing bentonite slurry inside the earth bin by air. The construction process is reasonable in design, simple to operate, low in input cost, high in safety coefficient and good in using effect; the practical problem that under the tool-changing severe conditions of loose stratum at the shutdown position of the shield machine, poor self-stabilization capacity of tunnel face earth and the like, existing common tool changing methods fail in changing tools is solved.

Description

technical field [0001] The invention belongs to the technical field of tunnel shield construction, and in particular relates to a mud film construction technology for tunnel face protection wall used for shield tunnel air compression operation. Background technique [0002] The shield method is a fully mechanized construction method for modern tunnel construction. The main mechanical equipment used is the shield machine, which is divided into two types: earth pressure balance shield and mud-water balance shield. Among them, the earth pressure balance shield is used more. During the tunneling process, the shield machine uses the cutter to cut the soil and break the rock, and the shield machine needs to replace the cutter after long-distance excavation (especially in the hard rock formation or the soft and hard uneven formation). At present, the tool change methods adopted by domestic shield machines in the tunneling process mainly include two types: normal pressure tool chan...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a mud film construction process for the face of the shield tunnel face for compressed air operations in view of the deficiencies in the above-mentioned prior art, which has reasonable design, simple operation, low input cost and high safety factor, and can The effect is good, and it can solve the practical problem that the existing common tool change methods cannot perform tool change when the ground is relatively loose at the stop position of the shield machine, and the self-stabilization ability of the tunnel surface is poor.

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