Located in Clay County, Kentucky, this CON/SPAN® O-Series® Bridge System was selected by the Kentucky Transportation Cabinet (KYTC) District 11 as a replacement for a conventional box beam bridge. Upon bridge inspection in April 2013, the original box beam bridge was reduced to a 3 ton load limit due to broken steel strands in the beams. For this reason, area school buses and truck traffic were required to take a 45 minute detour to reach their final destination. The project was fast-tracked as an emergency replacement and bid in May 2013.
"A quick solution was needed due to the extended detour route for school buses, freight and materials being delivered to an adjacent construction project," stated Daniel Hoffman, Project Delivery & Preservation Branch Manager with the London and Manchester Sections of the KYTC. "A detour at the bridge location was not feasible while a new bridge was under construction due to utility conflicts, restricted amount of R/W and a large gradient change."
Several options for replacement were discussed but in the end, it was decided that a 59' x 12'-4 3/4" precast CON/SPAN O-Series structure, 32' in length, was the best option. The CON/SPAN structure, with precast headwalls and wingwalls, was selected for its ability to be quickly designed, fabricated and then installed in September 2013. Construction of the entire project was completed in only 30 days.
"The O-series precast structure was the best solution for our situation," added Mr. Hoffman. "The structure met our hydraulic requirements while maintaining the existing road profile. It also was easily constructed within the maximum road closure time of four weeks as permitted by the Department. The project was a success and met the construction time requirements."