Often on a decent sized building site where there is a tower crane a mobile crane will be bought in so that the tower crane can focus on lifting the deliveries and moving formwork and other materials around on site while the mobile crane puts up small steelwork. (other times the mobile crane does the deliveries and the tower crane puts up the steel)
This allows the site to keep moving, the riggers dont need to stop for other peoples lifts and other trades dont loose access to a crane while steel is being put up.
Usually the crane is a mobile crane parked adjacent to the building being constructed or a spider crane is lifted onto the slab.
However on this Brookfield Multiplex site the crane selected for the job was... a mobile crane to be places on the slab, this doesnt happen too often and there needed to be a pretty decent size mobile crane to lift it into place, back propping of the slab was also necessary and the surveyor made points on the slab (where the propping is) where the crane had to be set up
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