| 摘要 |
A rock bolt ( 10 ) which includes An elongate tubular member ( 18 ), which is formed with an inlet ( 22 ) through which a pressurized fluid can pass, into an interior of the tubular member ( 18 ), thereby to expand the tubular member ( 18 ) in a radial direction, an elongate shank ( 12 ) with a first end ( 14 ) which is secured to the tubular member ( 18 ) and a second end ( 16 ), and an expansion unit ( 26 ) which has a wedge-shaped member ( 44 ) at the second end ( 16 ) of the shank ( 12 ).
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