Self-drilling rock bolt assembly and method of installation

摘要

A self-drilling rock bolt assembly (1) including a drill head mechanism (100) and a fluid delivery system (300) operatively associated with each other and adapted in use to secure a self-drilling rock bolt (200) into a strata (2). The rock bolt (200) having a shaft (210) having a cutting end (220) and a driving end (230). The drill head mechanism (100) having a bolt coupling portion (130) to releasably engage with the driving end (230) of the rock bolt (200). Wherein rotation of the bolt coupling portion (130) rotates the rock bolt. A central hollow portion (111) provides access to a fluid connection port (232) of the rock bolt and a nut coupling portion (120) releasably engages with a nut element (250) located on the shaft of the rock bolt. Wherein rotation of the nut coupling portion rotates the nut element. The fluid delivery system (300) has an injection nozzle (320) in communication with one or more sources of fluid for delivering measured quantities of one or more fluids to a predetermined location about said assembly. Each source of fluid including a reservoir (310, 311, 312) in fluid communication with a pump (313, 314, 315). The pump being in fluid communication with the injection nozzle so that said fluid from said reservoir is adapted to be pumped to said predetermined location. Whereby in use said drill head mechanism drives the rock bolt into the strata by rotating in a drilling direction the rock bolt and nut element at the same rate such that the nut element remains in the same position relative to the shaft of the rock bolt.

主权项

1. A self-drilling rock bolt assembly including a drill head mechanism and a fluid delivery system operatively associated with each other and adapted in use to secure with pre-tension, chemically, via injection, a self-drilling rock bolt into a strata; the rock bolt including a shaft having a cutting end and a driving end; the assembly including:
a. the drill head mechanism having:
a bolt coupling portion to releasably engage with the driving end of the rock bolt, wherein rotation of the bolt coupling portion rotates the rock bolt;a central hollow portion providing access to a fluid connection port of the rock bolt; and,a nut coupling portion to releasably engage with a nut element located on the shaft of the rock bolt, wherein rotation of the nut coupling portion rotates the nut element; b. the fluid delivery system having:
an injection nozzle in communication with one or more sources of fluid for delivering measured quantities of one or more fluids to a predetermined location about said assembly,each source of fluid including a reservoir in fluid communication with a priming pump, the priming pump being in fluid communication with a replacement pump, the displacement pump being in fluid communication with the injection nozzle, so that said fluid from said reservoir is adapted to be pumped to said predetermined location;a cleaning flush phase for each separate internal passage within the injection nozzle, that has each cleaning fluid sourced from a different reservoir pressure source; whereby in use said drill head mechanism drives the rock bolt into the strata by rotating in a drilling direction the rock bolt and nut element at the same rate such that the nut element remains in the same position relative to the shaft of the rock bolt.