Self-tapping, and self-tapping and self-drilling, rock bolts

Details Self-tapping, and self-tapping and self-drilling, rock bolts Self-tapping, and self-tapping and self-drilling, rock bolts

E - Fixed Constructions

21

D

E21D 21/00 (2006.01)

Patent

CA 2095230

ABSTRACT A self-tapping rock bolt comprises a discontinuous threaded profile (9) having a plurality of cutting edges (11) and at least one flute (13) extending along the length of the rock bolt. The cutting edges (11) are adapted to cut a threaded profile in the internal surface of a pilot hole so that the threaded profile (9) of the rock bolt interlocks therewith. The or each flute (13) is adapted to facilitate removal of material cut by the cutting edges (11). A preferred embodiment of the rock bolt includes an internal axial hole (25) to enable water to be injected through the rock bolt as the threaded profile is being cut. A self- tapping and self-drilling rock bolt comprises the self-tapping rock bolt described above and a cutting means (23) to cut a hole for the rock bolt.

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