DEVICE FOR DRIVING DEEP TUNNELS IN LOOSE GROUND BY ADVANCE SUPPORT METHOD Russian patent published in 1997 - IPC

FIELD: mining industry. SUBSTANCE: device has self-propelled gantry frame which carries front and rear bow-shaped guide members of similar diameter, and mounted on them at each side of tunnel is movable carriage with cantilever and drive unit for movement which is pivotally connected with longitudinal frame with slots. Installed in these slots is cutting-in machine which is provided with hydraulic power cylinders for longitudinal displacement which are connected with longitudinal frame of machine. Installed on each carriage is hydraulic cylinder for lifting with its one end resting on carriage cantilever and by its other end connected with longitudinal lifting frame with possibility of rocking. Each cutting-in machine can turn its working member in cutting plane at right angle for cutting slot in tunnel foot along its wall. EFFECT: high efficiency. 2 dwg