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Situated in downtown Chicago, the Sterling Tower is one of the city's latest high-rise residential developments.
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Rather than in staggered cycles, the walls and floors of this 140 m tall office and residential building are being constructed in practically one single pour. For this unusual assignment, Doka has developed a system in which 8 SKE 100 automatic climbers located on the inside of the shaft serve as the load-bearing construction. Attached to the brackets of the automatic climbers, there is a vertical steel construction with mounted-on trussed cantilever arms from which all the wall formwork elements for the central shaft core and the ad-joining wing walls are suspended. The SKE automatic climbing system is also used for the concrete placing boom: 2 sections lower (i.e. beneath the 8 automatic climbers for the formwork), there are 4 SKE 100 automatic climbers that are used for lifting the concrete placing boom.
This is a self-contained, autonomous climbing unit that can be raised hydraulically - either independently of the formwork, or in tandem with it. However, it is not only on the central core (with its shaft and wing walls) that Doka automatic climbers are successfully in
action, but also on the exterior façade, where 35 SKE 50’s are being used to lift the Conesco steel formwork for parapets and columns. Dokaflex floor-slab formwork is being used on all the typical floors of the residential tower, with great success.
The Dokaflex formwork is in place underneath the 3 uppermost floors at any one time, with appropriate repropping being provided for the 2 floors beneath these.
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