Quote:
Originally Posted by bgsrand
Is that the same type of retaining wall used at the Spire site?
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Yes. The more relevant comparison here is Block 37, which was also a full-block excavation with several levels below grade, and is also adjacent to two subway lines.
I would actually expect to see a slurry wall at One Chicago Square, as this is cheaper than a secant pile wall.
Sheet piling is usually the cheapest way to retain an excavation in Chicago, but I'm not sure it is cost-effective to go this deep with sheet piling...