Gas cushion type mud water pressurization equilibration shield machine

Abstract

Disclosed is a cushion-type slurry-pressured balance shield machine applied in the tunnel project construction machinery industry, which consists of four operation modes such as excavation mode, bypass mode, isolation mode and reverse mode. Working principles of the machine are as follows: the cushion-type slurry-pressured balance shield machine is a slurry shield which adjusts the confining pressure in an excavation chamber in virtue of a cushion, and bentonite slurry which is a liquid medium with certain pressure is used to support and stabilize tunnel face in the process of excavating unstable strata; control of the pressure on the tunnel face is realized through controlling the pressure of the cushion and the elevation of the interface between the slurry and the cushion, so as to achieve the purpose of reducing disturbance to the strata; and a clapboard is arranged in a shield slurry chamber to divide the slurry chamber into two parts, the frontal surface of the clapboard is filled with pressured slurry and the part above a shield axis on the rear surface of the clapboard is filled with compressed air, thereby forming a cushion. With light disturbance to the strata and little sedimentation, the device is suitable for constructions in high underground water pressure, river bottom and submarine tunnel, and has a wide application scope of soil, an easy control system, a stable shoring of the strata of the excavation ground and a convenient control of surface subsidence.

Description

Technical field:

[0001] The invention relates to an air cushion type muddy water pressurized balance shield machine which is used in excavation of unstable strata in the tunnel engineering construction machinery industry and uses an air cushion to adjust the sealing pressure in an excavation chamber. 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 the formation, ...

Images