PROJECT HIGHLIGHTS: WASHINGTON BYPASS BRIDGE
McNary Bergeron provided peer review of the erection gantry design, peer review of construction loads on the structure during construction, and assistance with developing the erection manual.
Construction Method and Specifications
This project involves construction of a three mile bridge over the Pamlico-Tar River. The contractor utilized a new top-down construction technique to ensure minimal disturbance to the surrounding environment. The span-by-span construction method uses the previously constructed spans for personnel access and material deliveries. The process consists of self-contained erection gantries capable of performing all tasks associated with the bridge construction, including driving the precast piles, building the pre-cast bent caps, erecting the 120-foot-long precast girders, and pouring the deck. All of these operations were performed without the use of temporary access trestles, thus significantly reducing environmental disturbances.