| 摘要 |
A plug member ( 10 ) for retaining grout in a cable bolt hole or a rockbolt hole or inside a rockbolt in underground excavations, comprising a cylindrical cap portion ( 20 ) with a means to wedge ( 26 ) the cap portion in the hole. The means to wedging means ( 26 ) may comprise a plurality of inclined flaps, a continuous resilient skirt, or a tapered bung. The cap portion ( 20 ) is provided with at least one port ( 50 ) to receive a grout delivery hose. The or each port ( 50 ) is comprised of a plurality of flexible flaps ( 56 ) moveable between an open position and a closed position. In the closed position the flaps ( 56 ) inter-engage to substantially close the port ( 50 ) and prevent grout leakage from the hole.
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