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Drilling the caissons at Optima Center in Streeterville

Optima Center, Chicago

Ever wonder what keeps Chicago’s giant high-rises from sinking into the ground under their own weight? The answer is caissons. Workers are currently drilling the concrete caissons – you can think of them as stilts – that will support Optima Center, the 42-story, 325-unit apartment tower being built at 200 E Illinois St in Streeterville. ...

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Posted by Joe Zekas on December 17, 2011