| 摘要 |
A trench shoring frame comprising a pair of side wall structures for engaging the side walls of a ground trench when said shoring frame is in said trench, said side wall structures being supported in spaced-apart relationship so as to be capable of supporting the trench walls, and a plurality of vertically disposed plate means movably connected to at least one guide frame so as to be capable of being moved vertically relative to said side wall structures and into and out of the ground below the lowermost level of the side wall structures when the frame is in said trench. |
