Quote:
Originally Posted by colemonkee
^ This is the first time I've seen top-down construction used on a project of this size. Have any other supertalls been built with using top-down?
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River East Center in Chicago used this construction method, and so did Block 37. They sunk the caissons and poured a structural floor slab with earth beneath it. They left a few bays of the slab open and used mini-excavators to remove the dirt from underneath the slab. At 2 stories down, they set up forms and pour the first slab underground, etc until completed.