| 摘要 |
The present invention relates to a single pass drilling apparatus, a rock bolt, use of a drill bit and a method for single pass rock bolting for reinforcement and stabilization of excavations. The single pass drilling apparatus comprises an elongated drill steel ( 11 ) having a leading ( 12 ) and a trailing end ( 1 3 ) with reference to a drilling direction (F). The leading end ( 12 ) has a connection portion. A one-piece drill bit ( 16 ) is utilized having rock machining means ( 17,18;17'18' ). The drill bit is connectable to the drill steel. The single pass drilling apparatus ( 10 ) further comprises a rock bolt ( 21;121,221;321 ) adapted to at least partially enclose the drill steel ( 11 ). The greatest diametrical dimension (DB) of the drill bit ( 16 ) is smaller than the smallest diametrical dimension (DI) of the rock bolt. |
