| 主权项 |
1. Pile-driving apparatus for driving a pile element into the ground comprising
a mast, a driven hammer unit which is supported in a movable manner along the mast and has a driving helmet in a lower region which is designed for receiving a head region of the pile element to be driven in, a main winch with main rope which is connected to the hammer unit for moving the hammer unit along the mast, and an auxiliary winch with auxiliary rope which is guided over the mast and is be connected to a pile element to driven in, wherein by means of the auxiliary winch the pile element to be driven in is hoisted from a lying position into an approximately vertical driving position, in which the head region of the pile element is received in the driving helmet of the hammer unit, wherein a control means is provided for the simultaneous automatic control of the main winch and the auxiliary winch, during hoisting of the pile element to be driven in, the main winch and the auxiliary winch are controlled by the control means so that the hammer unit is moved by the main winch from a lower starting position on the mast and, during hoisting by means of the auxiliary winch, the head region of the pile element rests with a predeterminable pressing force against the driving helmet, the main winch and the auxiliary winch each have a hydraulic motor, and through the control means the supply of hydraulic fluid to one of the hydraulic motors or to both hydraulic motors is controlled for setting the pressing force. |
