PROJECT SUMMARY OVERLAND BRIDGE - PHASE ONE Jacksonville, Florida DRILLED SHAFTS DRILLED SHAFT DESIGN AND TESTING Drilled shaft diameters ranged from 42 to 72 inches, with ultimate capacities ranging from 725 to 1,540 tons. Installation depths ranged between 55 and 95 ft below working grade. Prior to production work, three sacrificial shafts were constructed at +/- 700-ft intervals in similar soils along the corridor where production shafts w

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