The Lock and Dam 24 rehabilitation project focused on two primary elements: extensive steel replacement on 15 tainter gates and the rehabilitation of 7 concrete piers. For the elliptical tainter gates, OCCI demonstrated substantial structural repair capabilities by replacing internal transverse frames and horizontal ribs, a process that required removing up to 220,000 pounds of debris and busting over 2,600 rivets from each gate's interior. Exterior work involved replacing worn skin plate, framing, and upgrading the operating machinery from an old bicycle-style chain to a new, more robust log-style chain, which included replacing the associated sprockets and shafts. All repaired gates and the bridge span were blasted and painted for corrosion protection. The pier rehabilitation involved complex mass concrete work, where the four structural columns and cap supporting the service bridge were replaced. This required OCCI to use advanced techniques, including falsework and hydraulic jacks, to safely offload the bridge structure before demolishing and casting the new pier elements.
Gate Rehabilitation, Concrete Repair, Structural Coatings, Steel Repair
