Quote:
Originally Posted by Zapatan
It'll probably be fine but it has been more exposed than foundations that have buildings covering them... I'm sure that makes quite a difference. They even capped 2WTC's foundation in NY for that reason but the Spire's has been exposed to air for a decade.
Just commentary over the past year or so, I'm not saying people are right but no one seems to have faith in Related Midwest or think that Chicago's Market is strong enough for a 400+ building.
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Not exposed at all - buried deep below the frost line - even in the pit.
In this photo from March of 2008 the drilling rig can clearly be seen poking up out of the hole, that is a full sized crane, once a caisson was drilled, socketed, and poured rebar would be left poking up the thickness of the mat - to allow the drilling rig to maneuver these holes with the exposed rebar would be filled in with the gravel shown in the earlier photo, so the crane could then drive over them. Thus the tops of the caissons are well below the frost line (2-3 ft here)
https://climateillinois.files.wordpr...4/02/feb26.gif
