The Pittsburgh Commercial Street bridge was completed in 1951 and is now used by more than 100,000 vehicles every day. The concrete bridge went through three rehabilitations, during 1980, 2006 and 2012, but eventually needed to be replaced with a new structure that could carry permit loads. This major infrastructure project utilized Accelerated Bridge Construction techniques. The replacement span was built beside the old bridge over a period of months, and then laterally slid into position immediately after the old bridge was demolished. This methodology reduced the time of traffic impacts on the public, from nearly four years of intermittent … Read more