200 N. Michigan Avenue Chicago, Illinois Case coordinated with the project team and helped develop the best approach to install 52 belled caissons. Belled caissons had shaft diameters of 2’-6” to 8’-0” and bell diameters ranging from 4’-0” to 23’-0”. Each belled caisson was founded on hardpan approximately 85ft below grade with an allowable bearing of 45,000 PSF. Caissons were installed with a Caldwell drilling attachment mounted on

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