Also found in: Dictionary, Thesaurus, Wikipedia.
pile driver[′pīl ‚drīv·ər]
a machine for supporting pile-driving equipment and for guiding piles being driven into the ground. Pile drivers may be of the tower type (non-self-propelled) or the crane type (self-propelled).
Tower pile drivers have a mast on which the pile-driving equipment is installed; it may be tilted at an angle during driving of the piles. The mast and truss are mounted on an overhead frame that can rotate through 360° relative to the lower frame (full-swiveling pile driver). The lower frame is mounted on wheels, which travel along a track. Tower pile drivers are 11–22 m high and have a lifting capacity of up to 9.5 tons. They may be used to drive piles both on land and under water (from a barge or pontoon).
Crane pile drivers are mounted on a derrick crane, excavator, tractor, or truck. In the case of a pile driver mounted on a crane or excavator, the upper part of the mast is connected to the boom head by a hinge, and the lower part is connected to the swiveling platform. The piles and pile-driving equipment are raised by winches on the crane or excavator. For pile drivers mounted on a caterpillar tractor or truck, the mast is fastened by a hinge to the vehicle frame, which also carries the hydraulic cylinders that tilt the mast to transport position and a winch driven by the engine of the base vehicle. Crane pile drivers are 13–35.5 m high and have a lifting capacity of up to 25 tons.
A. IU. BROMBERG