1.the safe operation of tower cranes from the tail and around the periphery of the construction of buildings and other facilities should be not less than 0.6m.
2.the minimum distance between the two tower cranes erected between the end of the boom should ensure that tower cranes are low among the other tower crane tower with a distance of at least 2m; the lowest position in the high tower of parts (hook rose to the highest point or minimum balance arm portion) and the lower tower crane in the highest position in the vertical distance between the parts of not less than 2m.
3. boom type and not yet attached jackup tower crane can not hang placards on the tower.
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