Patents
Device for sealing inside an upward drilled borehole for high pressure water injection in underground mines which comprises an externally threaded injection pipe (1) , characterized in that the said pipe (1) having an end flange (2) welded onto the said injection pipe (1) at the injection end top, the said injection pipe being provided at the flange end with a plurality of externally mounted expandable flexible rings (3) of circular cross section, the said rings (3) being held in position by a steel gasket (4) and a peripherally slotted locking nut (5) fitted to the said pipe (1), the said externally threaded injection pipe(1) being provided at the bottom end portion with an internally threaded retreating tapered nut (11) having a sealing ring (10) and a concentric flange (6) being provided with at least four threaded ground studs (8) and nuts (9).