| 摘要 |
PURPOSE:To permit the driving operation of piles by connecting an upper leading to the tip of a lower leader as well as crane operation using sheave by providing sheaves at an extending position and a housing position in the tip portion of the lower leader in a freely rocking or fixing manner. CONSTITUTION:A pair of sheaves 31 and 32 are provided in a freely rocking and fixing manner at an extending position and a housing position through arms 4 and brackets 5 in the tip portion of a lower leader 2 attached to a car body 1 in a vertically turnable manner, and an upper leader 6 is provided along the lower leader 2. A wire rope 9 is provided through the pulley 8 of a strut 7 to the lower leader 2 and a winch 10, a wire rope 11 is laid on a winch 12 and the sheaves 31 and 32, and a hook 3 is hung down. The sheaves 31 and 32 can thus be housed in the upper leader 6, the upper leader 6 can be connected to the lower leader 2, and during the crane operation, the sheaves 31 and 32 can be largely extended by the lower leader 2, ensuring sufficient operations. |
