| 摘要 |
<p>An installation for driving a slender object (11), such as a pile, tube or sheet pile section, into the ground or for extracting such a driven-in object from the ground comprises a hammer device with a ram (20), drive means (16) for moving the ram and striking means which can be brought into interaction with the slender object (11) and which have a striking face for receiving blows originating from the ram (20) brought into movement by the drive means (16). Viewed in the direction perpendicular to that side thereof which comes into contact with the striking face of the striking means, the ram (20) has a cross-sectional pattern which essentially changes continuously without discontinuities, such that the force waves which are generated in the ram when the ram strikes the striking means do not give rise or only slightly give rise to the generation of parasitic shock waves. <IMAGE></p> |
