| 摘要 |
<p>A pile-driver comprises several guides (3,4) on which a hammer (2) is displaced by means of a hydraulic cylinder (5, 6). The longitudinal axis of the hydraulic cylinder lies outside the path of the centre of gravity of the hammer. The hammer is guided by three guides parallel to the path of the centre of gravity of the hammer. The hammer is preferably mounted and guided in the end regions of said guides.</p> |
