单词	tower crane
释义	tower crane tower crane n (Mechanical Engineering) a rotatable cantilever jib on top of a steelwork tower used on building sites where the operator needs to command a good view of the site Tower crane tower crane [′tau̇·ər ‚krān] (civil engineering) A crane mounted on top of a tower which is sometimes incorporated in the frame of a building. Tower crane A crane in which the lifting mechanism is mounted on top of a tower that is structurally independent of the structure it is working on. tower crane A type of crane consisting of a fixed vertical mast which is topped by a rotating boom, equipped with a winch for hoisting and lowering loads and placing them at any location within the diameter of the boom.
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