| 摘要 |
The outer layer of a surface (11) is cut away by means of a high-pressure water jet by providing two parallel guides (12, 13; 51, 52) parallel to the surface, mounting a feed beam (22) between the guides, reciprocating a jet unit (33, 34) along the feed beam in cutting passes and moving the feed beam in steps along the guides in order to cut away the entire surface. The feed beam (22) is moved in steps between two cutting passes by providing two gripping jaws (40, 41), one fixed and one movable, for each guide (12, 13; 51, 52) and allowing one gripping jaw of each guide in turn to grip while the other is released, the movable gripping jaw (41) being displaced a predetermined length along the guide with the fixed gripping jaw in the gripping position. |
