"Each of the 70-foot long beams for the Knickerbocker Bridge weighed only 5,000 pounds," said Kim Suhr, vice president, Wyman & Simpson. "We were able to erect the beams using a small crane instead of mobilizing a 200-ton crane."
Once the beams were filled, the contractor began placing reinforcing for the deck pour. With top flange widths of 4 feet, the beams were placed tip to tip so that no deck forming was required. Scupper details, screed rails and reinforcing details were no different than those for a comparable precast concrete bridge. The first half of the deck was cast in October of 2010. After working through the winter to complete the remaining piers, the contractor completed installation of the second half of the HCB superstructure in April of 2011. The bridge was officially opened to traffic on June 11, 2011.
"What makes the Knickerbocker Bridge unique is not only the HCB framing system, but the fact that this will be the longest composite vehicular bridge in the world, the first to be made continuous for live load, and the fact that this has been accomplished with a structure that was no more expensive than a conventional concrete box beam bridge," said John Hillman, HC Bridge Company president.