This Georgia Department of Transportation project involves the construction of two new, high level, fixed span, multi-lane bridges over the Wilmington River located approximately 0.3 mile east of the city limit of Savannah along the Islands Expressway (CR 787) in Chatham County, Georgia. The project will replace the double bascule bridges that currently exist at this location. Each bridge has a total length of 1,970 feet with a total of 12 spans. The bridge main span over the Wilmington River is comprised of a three span continuous post tensioned, prestressed concrete beam unit with a cast-in-place concrete deck, while the remaining 9 approach spans consist of simply supported prestressed concrete girders with a cast-in-place concrete deck.
As Construction Engineer for this project, FINLEY provided construction engineering services for the three span continuous main span. The continuous main span unit is comprised of constant depth prestressed concrete end and drop-in beams with haunched prestressed concrete beams over the piers. FINLEY provided the design of the temporary works required to support the prestressed beam sections during erection including, steel temporary bracing, steel strong-backs, and approximately 80ft tall steel pipe temporary towers. In addition to these services, FINLEY provided 3D modeling to verify crane boom obstructions with the existing overhead power transmission lines and verification of barge crane locations per Prince’s means and methods to prevent interference of the crane booms with the temporary works elements or previously erected beam sections.