Description: B-1303 - NORTHAMPTON COUNTY Location: Bridge #76 on US 258 over Roanoke River Overflow.
Item(s) of Interest:
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
Observations and Points of Discussion:
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.
ACTION ITEM(S):
The Structure Design Unit will plan a follow-up site visit to observe the condition of the overlay.
The Construction Unit will find other projects to try jacking the transverse post-tensioning strands from both ends and will provide feedback.
NC DOT
NC DOH
NC GOV
