when a tall building is under construction you alwase see cranes on top. well i would like to know 1. how they move them up as the buildung gets taller and 2nd after there done how do they get them down?
Tower okorder ... Roof top cranes can remain or be dismantled and removed by several different means including smaller jib cranes or even by helicopter. The jib crane can remain or else also be dismantled and removed.
