| 摘要 |
The pile-driving arrangement can drive piles both above and below water. It includes a housing containing a gas-filled motion chamber and an impact body movable upward and downward in the motion chamber. A cylinder-and-piston mover includes a cylinder part and a piston part, one part connected with the housing and the other with the impact body, for effecting relative movement between the impact body and the housing. A drive unit on the housing includes a drive motor, a pump driven by the motor and a pressure fluid tank. The drive unit is connected with the housing for limited movement relative to the housing. The cylinder part and the pressure fluid pump are interconnected by flexible conduits leading from the pump to the opposite working chambers of the cylinder part, and a direction-changing device controls fluid flow through the conduits. The drive unit is buoyant and floats above the housing at a certain distance when the pile-driving arrangement is submerged, so that shocks are not communicated directly to the drive unit.
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