Giant Cantilever Crane
Also known as a hammerhead crane, the giant cantilever crane is a fixed jib crane consisting of a steel braced tower, on which revolves a large horizontal double cantilever. The forward part of this cantilever or jib carries the lifting crab, and the jib is extended backwards in order to form a support for the machinery and counterbalance.
Besides the motions of lifting and revolving, there is a so-called “racking” motion, by which the lifting crab, with the load suspended, can be moved in and out along the jib without altering the level of the load. Hammerhead cranes are generally constructed in large sizes, up to 350 tons.
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