Abstract: The device has a drill body, of generally cylindrical shape, connected by a flexible pipe to a high-pressure water pump placed on a low-height carrying vehicle. A striking piston is mounted movably, and is resiliently returned, in the drill body, and is subjected to a pulsed high water pressure so as to be moved with a percussive movement against a bit-carrying anvil, the pipe simultaneously transmitting to the drill body an alternating rotary movement about its principal axis. A solenoid valve, interposed between the pump and the point of departure of the pipe, receives successive electrical pulses causing opening and closing, which create shock waves in the water column contained in the pipe, which transmits these shock waves to the striking piston of the drill body. Applications: underground workings, mine workings, particularly for use in low-height galleries.

Abstract: The drilling and bolting head (7) of compact structure, is designed for use in mine galleries of small height. It comprises: a transverse table (8) connected to the carrying vehicle, preferably with a device (9 to 12) for lifting this table (8); a slide (13) displaceable along the table (8); an intermediate support (16) displaceable vertically on the slide (13); a vertical beam (21) mounted pivotally on the intermediate support (16); a vertical slideway (23) guided vertically on the beam (21); a drill (26), with a device (33, 34) for the drilling and setting of bolts, which is guided vertically on the slideway (23); motorized device (14, 18, 30) for controlling the various movements. The intermediate support (16) possesses an upper part (20) which can be used as a prop, in combination with a jack (18) arranged along the vertical pivot axis (19) of the beam (21).

Abstract: The drilling and bolting head (7) of compact structure, is designed for use in mine galleries of small height. It comprises: a transverse table (8) connected to the carrying vehicle, preferably with means (9 to 12) for lifting this table (8); a slide (13) displaceable along the table (8); an intermediate support (16) displaceable vertically on the slide (13); a vertical beam (21) mounted pivotally on the intermediate support (16); a vertical slideway (23) guided vertically on the beam (21); a drill (26), with means (33, 34) for the drilling and setting of bolts, which is guided vertically on the slideway (23); motorized means (14, 18, 30) for controlling the various movements. The intermediate support (16) possesses an upper part (20) which can be used as a prop, in combination with a jack (18) arranged along the vertical pivot axis (19) of the beam (21).