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为解决塔机的拆卸设计了系缆式桅杆起重机作为屋面上起重设备，包括其设计的结构、受力计算以及拆卸方法和步骤。
In order to solve the dismantling of tower crane, a mooring mast crane is designed as a lifting device on the roof, including the design of the structure, the method of force calculation and the method and steps of disassembly.