| 摘要 |
PURPOSE: A crawler crane is provided for a multipurpose operation. CONSTITUTION: A crawler crane(1) is composed of a main winding drum(3), a subsidiary winding drum(4), a third drum(5), an engine(7), a circling frame(2), a counter weight(8), and a brake embedding a drum. A casing jack is installed by a cooperating work of each drum. The casing jack rotates and forcibly inserts a casing and a hammer grab digs the casing to make a pillar hole. Then concrete flows inside the hole to make a pillar. Therefore, when one drum is out of order, other drums are operated continuously and the work of release free falling is easily processed by each drum.
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