Bentonite mud water pressurization equilibration shield machine

Abstract

The invention provides a bentonite slurry compression balance shield machine which is applied to the tunneling construction machinery industry and has four operational modes of cut mode, bypass mode, isolation mode and reversion mode; the operating principle of the invention is that a sealed cabin of an anterior shield mounting baffle plate is injected with the pressured bentonite slurry which is the prepared bentonite-water mixture, forming a pressured slurry cabin, the stable cut surface is realized by the compression system and the pressure-maintaining system; the injected pressured bentonite slurry can be penetrated into the stratum with the depth of a plurality of centimeters and embedded into clearances between soil particles, forming a layer of 'slurry film' which can make the stratum relative stable and water seepage resistant and capable of firmly supporting the soil in front side; when the soil is cut by the cutter head, the cut soil enters the slurry cabin through holes in the cutter head and is mixed with the feeding bentonite slurry to form the high density slurry which is closed in the slurry cabin and conveyed to grounded treatment factories by the deslagging pump. The invention causes little disturbance and sedimentation to the stratum, thereby the invention has wide application range of soil quality and is applied to tunnel constructions in places with high ground water pressure such as river bottom, stream bottom and sea bottom.

Description

Technical field: [0001] The invention relates to a bentonite mud-water pressurized balance shield machine which uses bentonite mud as a fluid medium to support and stabilize the tunnel face in the tunnel engineering construction machinery industry. Uplifts and other extremely sensitive building under the situation. Background technique: [0002] At present, when the shield construction in the tunnel engineering construction machinery industry encounters unstable strata such as alluvial layers, sand layers, and silt layers with poor self-support, or when the hydrostatic pressure is high, the ordinary shield must be supplemented by compressed air and precipitation. , Grouting reinforcement and other measures to ensure the stability of the excavation surface. However, if the air pressure is too high, it will threaten the health of the operators; the precipitation will dry up the surrounding wells and the buildings will subside; when the organic slurry is injected to strengthen...

AI Technical Summary

Problems solved by technology

However, excessive air pressure will threaten the health of operators; precipitation will dry up the surrounding wells and cause buildings to subside; when organic slurry is injected to strengthen the formation, it will pollute the groundwater

Images