Quote:
Originally Posted by rlw777
I think you're thinking of NY where in much of the city bedrock is just below the surface. Chicago is notoriously built on a swamp so every big project starts out with deep foundations like the photo below from the 110 N Wacker construction thread.
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The soils weren't the issue with the foundation it was left over foundation from Hudson's building
Crews spent the last year and a half demolishing an old parking garage, drilling through old concrete foundation left behind after the demolition of Hudson's and building a new foundation.
It's "always assumed" that there will be obstructions whenever installing caissons, cylindrical chambers that go deep into the ground for foundation, Guziewicz said, "but ... we hit the jackpot of all obstructions ... we hit so many obstructions that it blew our obstruction allowance."
Mike Schefka, project director for Southfield-based Barton Malow, the construction management company on the project, said "it was much more challenging here because of the existing foundation from the old Hudson's. We had to drill through concrete and a lot of obstructions that were buried in there when they imploded it. It’s one thing drilling through earth, it's another thing drilling through existing concrete.
https://www.detroitnews.com/story/bu...es/5404886002/