| 摘要 |
A traveling trench shoring device consisting of longitudinal panels which cover the walls of the trench completely and are supported by movable frames, the panels being moved forward by jacks connecting the panels to the frames which are held in place by the friction between the walls and other panels, the device comprising a working chamber and a separate unconnected sloping approach section, and panels which can be raised individually and have cover plates on their lower outer edges and ends to prevent entry of earth between them and panels below and behind them, the connections for the jacks on the frames also being movable vertically and individually.
|
