| 摘要 |
<p>Shoring panels 2, 4 for supporting sidewalls of a trench are formed of a GRP (glass reinforced plastics) sheet material with opposite faces each having a corrugated surface profile. The panels are incorporated into shoring systems that may comprise at least one pair of bracing means 6a, 6b; 8a, 8b to force the panels into shoring contact with the excavation sidewalls. Preferred bracing means are hydraulic jacks or rams. Each panel may be attached to one or more supporting waler rails or bars 20, 21, 22, 23.</p> |
