Pneumatic auxiliary device for shield tunneling machine soil pressure balance

Abstract

The invention discloses a pneumatic auxiliary device for shield tunneling machine soil pressure balance. The pneumatic auxiliary device for shield tunneling machine soil pressure balance comprises anair system and a pressure maintaining system, wherein the air system is connected with a soil bin and can inject gas into the soil bin; the pressure maintaining system is used for monitoring the pressure in the soil bin and controlling the air system whether to inject gas into the soil bin; the air system comprises an air compressor, a gas storage tank and a freezing dryer; the input end of the gas storage tank is connected with the output end of the air compressor; the input end of the freezing dryer is connected with the output end of the gas storage tank; the output end of the freezing dryer communicates with the internal part of the soil bin through an air pipeline; the pressure maintaining system comprises a control valve, a pressure transmitter and a control device; the control valveis arranged on the air pipeline; the pressure transmitter is used for measuring the pressure in the soil bin; and the control device is connected with the pressure transmitter and the control valve separately and controls the control valve to open and close. The pneumatic auxiliary device can reduce load when a shield tunneling machine tunnels, force back underwater through gas pressure, guarantee synchronous grouting quality, reduce abrasion of a cutterhead and a cutter, avoid mud cake of the cutterhead and improve tunneling efficiency.

Description

technical field [0001] The invention relates to an air pressure auxiliary device for earth pressure balance of a shield machine, which belongs to the field of earth pressure shield machines for tunnel construction. Background technique [0002] For the shield machine in the pure earth pressure balance mode that excavates in the composite stratum with well-developed rock cracks, rich water, high water pressure, and good air tightness, the shield machine is prone to gushing during excavation, the cutter head wears quickly, and synchronous injection The slurry quality cannot be guaranteed, and the slag temperature is easy to rise, which leads to problems such as low excavation efficiency. [0003] The existing shield machine in the pure earth pressure balance mode is generally 1 / 2 of the volume of the soil bin when excavating in moderately and slightly weathered rock formations with better self-stability, In order to balance the face and control the subsidence of the strata wh...

AI Technical Summary

Problems solved by technology

However, the above-mentioned gushing prevention method only reduces the gushing pressure, and groundwater will still enter the inside of the shield machine, which cannot fundamentally solve the gushing problem in the water-rich and high-pressure formation with strong permeability

In addition, too much water filled between the segment and the formation in the water-rich formation will dilute the grout injected by the shield machine during synchronous grouting, reducing the performance of the grout. The segment is prone to misalignment and affects the project quality.

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