October 29, 2010
This design-bid-build project involved the removal of 193,000SF (17,932SM) of deck in the westbound suspension and through cantilevered truss spans; and replacement with precast, post tensioned units during nighttime lane closures. In the 2,950' (899m) three-span suspension bridge, the new deck units are lightweight precast concrete composite with steel stringers and diaphragms. The units were installed during nightly lane closures, and post tensioned. New steel traffic barriers were fixed on the units. The typical unit is about 40' by 18' (12m by 6m). In the 1,720' (524m) three-span through cantilevered truss bridge, the new deck units are lightweight precast concrete slabs and concrete traffic barriers. The typical unit is about 24' by 20' (7m by 6m). The prefabricated deck units were cast by American Bridge near the site. The 900 tons (818 tonnes) of stringers and diaphragms were fabricated by American Bridge Manufacturing at their Coraopolis shops. Traffic barriers were also replaced on other sections of the bridge, with a total quantity of 23,092LF (7,038LM). Other work included the replacement of four expansion dams and installation of an aerodynamic stabilization winglet and fairing in the westbound suspension bridge, installation of acoustic monitoring cable sensors in the eastbound suspension bridge main cables, and repairs to a ferry terminal at the southwest corner of the bridge. Project also included the painting of the through truss. The contract was awarded on a best value basis, with technical factors considered along with price.