| 摘要 |
The invention relates to the installation of cables or pipes in tunnels, and in particular relates to the suspension arrangement for suspending the cable or pipe from blocks 10, 50, 54 spaced along a support rail 40, prior to fixing it to a ceiling. The suspension block has an upper roller arrangement (14, 16, Fig 1) for suspending the block from an upper rail and a lower roller arrangement (22, Fig 1) for suspending the block from a lower rail. The upper roller arrangement is controllable between engaged and disengaged configurations, so that the block 50 can be released from the upper rail 40 to allow another block 10 to pass, the block 50 running onto a lower rail 44 carried by the block 10. The upper rollers may be made to disengage by movement of a cam (28, Fig 4) which is operated by the front end 52 of lower rail 44. This enables cable loading into a tunnel and cable installation to the tunnel wall to be carried out in parallel. |
