Tanana Bridge #505

April , 2011

Pier 2 of the Tanana Bridge near Tok Alaska, divers installed I-Beam whalers to reinforce the existing cofferdam structure from collapse during removal. The sheet pile walls were exposed down to 12 feet below mudline where they were cut off using underwater cutting equipment.

On Pier 3 divers cut the sheet pile at mudline, then drilled 56 1 1/2″ holes into concrete debris. Explosive charges were installed in each hole.

Conditions on the work site were made all the more difficult by temperatures that ranged from -20 to 38 degrees.