To support the opening of a new Loudoun County School, Toll Brothers was in need of a bridge that would span Broad Run Stream. Rosa Lee Carter Elementary was due to open in the fall, and the goal was to have a finished bridge installed in less than five months.
The solution was a triple-span BEBO® arch bridge, a project that involved VDOT approval, a complex design and fast-tracked production and construction. The BEBO E-Series arch bridge includes a center 72-ft. span cell and two outer 60-ft. spans. The different spans were combined to accommodate a major floodplain and hydraulic requirements.
“Responsiveness and cooperation were an integral part of a team effort in making the project a success, completing three weeks ahead of schedule” said Jon Cannizzo, PE, Land Development Manager for Toll Brothers.
Two potential problems that posed a threat to the project were tall headwall heights and installation challenges due to precast counterforts extending over precast joints. A hybrid headwall system was therefore developed in lieu of using precast counterfort walls. This system, consisting of precast wall panels, cast-in-place counterfort walls and the traditional precast wingwall system, eliminated these potential challenges.
The Loudoun County school was able to open in August without concern over road construction or traffic delays and with an impressive new bridge to cross.