Posted: Oct 04, 2021 11:24 pm
by felltoearth
More concrete.

Each tower had massive continuous footings for the columns to rest on.

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Additionally, it seems there were structural slabs that ran from the tower perimeter to the 3’ slurry wall.

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Also, the subway tunnels were supported by concrete caissons

Some Articles From Engineering News Record.
To support the tubes as the earth was removed from under them, the contractor installed a line of 24-inch diameter caissons 40 to 50 ft c-c on either side of each tube. These were socketed into rock 2 ft below final subgrade, cleaned, and filled with a steel core and concrete before any excavation was done.


So I can keep looking. That was less than an hour on the internet. You’ve been at this twenty years. What exactly have you been doing with your time?


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