The collaborative approach also helped integrate hundreds of additional owner-approved repairs, identified during an independent preconstruction inspection, into the overall repair strategy. The team also accommodated an owner-requested alternative surface finish on the concrete barrier wall. Because this finish was not common practice, a two-person grinding and patching crew was detailed to work full time for more than six months to complete finishing in accordance with the owner’s expectations.

Photo by My Different Perspective

Because repairs to the bridge’s four distinctive arch spans would require partial demolition and extensive underwater work, the project team sequenced construction to minimize hazards to the area’s large number of boaters and jet ski users. Coordination with the North Carolina Wildlife Resources Commission ensured that up-to-date alerts and information bulletins were posted at marinas and other local boat access points. 

With demolition activity taking place just 50 ft above the waterline, buoys and work barges enhanced with lights and signage provided an extra measure of safety to boat traffic.

PCL installed strain gauges into the concrete arch ribs to monitor the stress and movement that each arch experienced during demolition. Because of precise cutting and careful resequencing of demolition, the arch ribs’ internal stresses remained within the engineers’ predetermined allowable tolerances.