| 摘要 |
This disclosure relates to an excavating sheeting unit having an outside adapted to bear against a trench surface and including a pair of spaced generally vertically disposed guide rails of C-shaped transverse cross section opening toward each other, a pair of sheeting plates having lateral edges disposed within the confines of the C-shaped guide rails, rollers carried by the lateral edges of the sheeting plates to permit relative sliding motion of the latter relative to each other and relative to the guide rails, and a plurality of supporting members located inside of the sheeting unit rigidly connecting together the guide rails and defining therewith a guide frame. |
