| 摘要 |
A pile driver, in which angle adjustment and pile core adjustment of a leader can easily be performed by suppressing an angle change of the leader when pile core adjustment is performed to be a minimum. The pile driver supports an upper part of the leader from the back by a rolling cylinder and supports a lower part of the leader by a front/back adjusting means having a leader arm where a rocking base part is fitted to a base machine so that it can rock and a rocking end is fitted to the lower part of the leader so that it can rock. A first arc which the rocking end draws when the leader arm is rocked and the lower part of the leader is adjusted forward/backward and a second arc that a connection part of a tip of the rolling cylinder and the leader draws are in projected shapes to upward. A radius of the first arc is smaller than that of the second arc. The end part of the first arc and that of the second arc when the lower part of the leader is adjusted to the most backward place become the highest positions. A straight line passing both end points of the second arc and one tangent in a center of the first arc become parallel.
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