Tower Crane / 天秤 / 塔式起重機
安装塔式起重机 Installation of tower cranes from Allan Ha on Vimeo . Tower cranes are a modern form of balance crane that consist of the same basic parts. Fixed to the ground on a concrete slab (and sometimes attached to the sides of structures), tower cranes often give the best combination of height and lifting capacity and are used in the construction of tall buildings. The base is then attached to the mast which gives the crane its height. Further, the mast is attached to the slewing unit (gear and motor) that allows the crane to rotate. On top of the slewing unit there are three main parts which are: the long horizontal jib (working arm), shorter counter-jib, and the operator's cab. Optimization of tower crane location in the construction sites has an important effect on material transportation costs of a project. Tower crane cabin Tower crane with "luffing" jib The long horizontal jib is the part of the crane that carries the load. The counter-jib carr...