Partial Width Precast is another fabrication option with the folded steel plate girder system and combines elements of the Side by Side construction and the Full Width Precast method. It is a precast option that can be used for structures too wide for the full width precast method. The bare steel girders are place over the supports. Precast deck slab units are then placed on top of the girders. The precast units span less than the full width of the bridge, typically half of the width, leaving a longitudinal closure region. The slab units are joined together using match-cast integral shear key filled with high strength epoxy adhesive. Once all the panels are joined, the shear pockets are filled with grout, as in the haunched region between the steel and concrete panels. The grouted shear pockets encase the shear studs, providing composite action between the steel and the concrete. Finally, the closure region is cast to create the finished deck.
Prior to FSPGS, the two primary limitations for galvanizing steel bridges have been transportation costs and galvanizing kettle size and availability. FSPGS’s lighter weight and 60 feet maximum span length fully resolve these issues. Several kettles throughout North America can accommodate our girders.
Galvanized surfaces have been troublesome to paint in the past, limiting color choice to the gray spangled and mottled appearance of the galvanizing. However, CDR Bridge Systems’ personnel have been educated in recent improvements and the specific procedures necessary for successful painting and top-coating of galvanized steel providing an enhanced level of corrosion protection and aesthetics.