Tubular rock bolt

Details Tubular rock bolt Tubular rock bolt

E - Fixed Constructions

21

D

85/25, 10/5

E21D 21/00 (2006.01) E21D 21/02 (2006.01)

Patent

CA 1300940

ABSTRACT A high tenacity rock bolt system utilizes a cold drawn steel tubular rock bolt construction possessing excellent load bearing and installation characteristics. The bolts are installed in bores drilled in the back, wall or rock face to reinforce the strata against local disturbances, and to maintain the strata in an effectively compressed condition. The subject tubular rock bolt may incorporate a visual Ground Movement Indicator (GMI) freely suspended as an unloaded rod element within the rock bore, extending through and projecting outside of the rock bolt, to afford visual indication of any axial displacement or elongation of the rock bolt consequent upon loss of anchorage and for settlement of the strata, or movement of the strata, inter alia to cause significant extension in the rock bolt. The hollow construction of the rock bolt greatly assists in economical, effective grouting, if required, to provide an enhanced, economical rock bolting system of high efficiency. The method of manufacture of the rock bolt from continuous weld cold drawn mechanical steel tube is also disclosed.

549771

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