Spring Field Review Details

Structures Bridge Sites

Title	County	Location

Spring Field Review Site 11 2007	Northamption	Bridge #76 on US 258 over Roanoke River Overflow
~ Concrete overlay looked very good with no observable cracking. ~ At the time of the visit the contractor was removing the on-site detour fill material. ~ The bridge appeared to experience a significant amount of impact loading from truck traffic. ~ There were questions on the benefits of requiring a smoother transition from the roadway on to the bridge during construction, i.e. before the final lift of asphalt is applied. ~ Jacking the transverse post-tensioning strand from each end was suggested to improve the transverse force applied to the bridge. A/I ~ The Structure Design Unit will plan a follow-up site visit to observe the condition of the overlay. A/I ~ The Construction Unit will find other projects to try jacking the transverse post-tensioning strands from both ends and will provide feedback.
~ One of the first box beam bridges with a concrete wearing surface -- let Sept 2005. ~ 3 - 60' spans with the box beams kinked in the center with "rooftop" bents in the longitudinal and transverse directions. ~ Utilized top-down construction. ~ New bridge is approximately 2 times longer than the old bridge