Posted Mar 16, 2019, 4:48 PM
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Urbane observer
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Join Date: Nov 2006
Posts: 4,393
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Yes, nearly all the South Loop buildings between Clark and the river have used friction piles, for a combination of reasons (AIUI): loose silty soil where the river wandered over the centuries, and cheaper. For the Roosevelt Collection, Walsh drove more than 40 miles of pilings, which they think is a record. I was surprised when the on-site engineer told me CMK's 14th & Wabash pilings were driven to limestone at -97. I'm guessing the spec was "driven to refusal," which they thought might occur at a lesser depth.
One exception was 1000 S. Clark, which used micropiles, making its neighbors much much happier. The second question South Loop residents ask about any new building is "will you be driving 'pylons' and giving us all headaches for months and causing cracks in our buildings?"
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