An auger-suction type metro jet system (MJS) device for aerated and lightweight cement soil, comprising a multi-pipe device, a spiral conveyor, an outer sleeve, an integrated device, a reamer head, a pressure monitoring system, a mass measuring device, and a control console, wherein the pressure monitoring system comprises a pressure sensor and a data acquisition device;
- the multi-pipe device, the integrated device, and the reamer head are connected from top to bottom;
- and the outer sleeve is located outside the multi-pipe device to form a drill pipe body;
- the multi-pipe device integrates a high-pressure cement slurry pipe, a backup pipe, a negative-pressure gas pipe, a hydraulic pipe, a negative-pressure water pipe, a main gas pipe, a pressure sensor wire pipe, a pressure water pipe, a backup gas pipe, and a power wire pipe;
- a top of the outer sleeve is provided with a mud outlet, and the mud outlet is connected to a waste liquid tank;
- the spiral conveyor comprises a shaft-type spiral conveying belt and an electric device;
- the spiral conveyor is provided between the multi-pipe device and the outer sleeve;
- the spiral conveyor comprises an inlet located at an end adjacent to the integrated device and an outlet communicated with the mud outlet;
- and the electric device is configured to drive the shaft-type spiral conveying belt;
- an outer side of a cylindrical wall of the integrated device is provided with a high-pressure water nozzle, a pressure sensor, and a high-pressure grouting hole from top to bottom;
- the reamer head is located at a bottom of the integrated device and communicated with a mud discharge channel inside the integrated device;
- a motor device is provided in the integrated device and is configured to drive the reamer head to rotate separately for soil cutting, so as to avoid disturbance to surrounding soil caused by overall rotation and soil taking of a drill pipe;
- a soil discharge channel is further provided in the integrated device;
- the soil discharge channel comprises an inlet adjacent to the reamer head and an outlet connected to the inlet of the spiral conveyor;
- the inlet of the soil discharge channel is provided with a gravel crusher;
- and the outlet of the soil discharge channel is provided with a mud discharge pressure chamber valve for forcing cut soil to enter the spiral conveyor from the soil discharge channel and discharging a soil-water mixture formed after high-pressure water cutting and excess cement slurry after high-pressure grouting;
- the main gas pipe is connected to the high-pressure grouting hole;
- and the negative-pressure gas pipe, the negative-pressure water pipe, and the backup gas pipe each form a pipeline provided with a pressure control valve in the integrated device and communicated with the soil discharge channel to assist in mud discharge and soil discharge;
- the hydraulic pipe forms two branches in the integrated device, and the two branches are respectively provided with pressure control valves and communicated with the mud discharge pressure chamber valve and the motor device;
- the pressure water pipe forms two branches in the integrated device, and the two branches are respectively provided with pressure control valves and communicated with the high-pressure water nozzle on the cylindrical wall of the integrated device and a pressure water outlet at a top of the reamer head;
- the high-pressure cement slurry pipe comprises an aerated cement slurry pipe and a lightweight cement slurry pipe and is communicated with the high-pressure grouting hole of the integrated device;
- when the aerated cement slurry pipe is used, multiple branch gas pipes of the main gas pipe are communicated with the aerated cement slurry pipe to inject a gas into cement soil;
- and when the lightweight cement slurry pipe is used, lightweight cement slurry in a cement slurry silo is doped with a foaming agent;
- the power wire pipe is configured to supply power;
- the high-pressure water nozzle is configured to spray high-pressure water for soil cutting;
- and the mud outlet is configured to discharge the soil-water mixture formed after high-pressure water cutting and the excess cement slurry after high-pressure grouting;
- a pressure control valve is connected to the control console through a wire in the pressure sensor wire pipe and configured to adjust a gas pressure in the branch gas pipes based on water and soil pressure data to control the gas to enter cement slurry in the high-pressure cement slurry pipe;
- the mass measuring device is provided in the waste liquid tank and configured to measure a mass of the soil-water mixture transported by a mud discharge pipe to the waste liquid tank and transmit measurement data to the control console;
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- the pressure sensor is connected to the data acquisition device through a wire in the pressure sensor wire pipe;
- the data acquisition device is connected to the control console;
- and the control console is configured to regulate each pressure control valve for collaborative control operation and control a motor.