THE CONCRETE BRIDGE MAGAZINE

Winter 2019

ASPIRE is a quarterly magazine published by PCI in cooperation with the associations of the National Concrete Bridge Council. The editorial content focuses on the latest technology and key issues in the Concrete Bridge Industry.

Issue link: http://www.aspiremagazinebyengineers.com/i/1064399

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Built in 1792, the Stone Arch Bridge over Stony Brook in Princeton, N.J., is the oldest still-in-use bridge owned by the state. The triple-arch stone bridge was built by local masons using stone from nearby quarries and currently carries U.S. Route 206 vehicular traffic in Mercer County. In 2016, after serving the public for more than two centuries, the historic bridge was nearing the end of its service life and was unsuitable to support traffic loadings in the 21st century. A rehabilitation project using cast-in-place concrete within the fill of the arches effectively strengthened and added durability to the structure, while preserving the beauty of the original bridge. Emergency Repairs On February 22, 2016, the parapet and spandrel wall above the north arch on the upstream side of the structure partially collapsed, forcing closure of this section of Route 206. The failed area was stabilized, and an in-depth inspection of the bridge was performed, which revealed more areas that needed repair. The partial collapse was a sign that the bridge needed attention to address the underlying causes of the failure. The roadway was reopened to traffic on March 7, 2016. However, heavy truck traffic across the bridge was prohibited, and the failed area and extensive leaning and bulging of the spandrel walls and parapets on the upstream face remained. The emergency repair, including the installation of temporary concrete barriers to protect the collapsed area and other nonstable parapet areas, allowed for the continued use of the bridge while the project to retrofit the structure for strength, safety, and durability was undertaken. Historical Considerations The historic nature of the bridge and adjacent structures was an important factor in the rehabilitation project. The crossing where the Stone Arch Bridge stands was part of the early 18th-century King's Highway and an important crossing during the Revolutionary War. The original timber bridge, which dated to 1738, when the area was settled by Quakers, was damaged for strategic reasons in the Battle of Princeton. The Stone Arch Bridge was profile U.S. ROUTE 206 BRIDGES OVER STONY BROOK / PRINCETON, NEW JERSEY BRIDGE DESIGN ENGINEER: Arora and Associates P.C., Lawrenceville, N.J. PRIME CONTRACTOR: South State Inc., Bridgeton, N.J. PRECASTER: Precast Systems Inc., Allentown, N.J.—a PCI-certified producer U.S. Route 206 Bridges Over Stony Brook Using concrete to rehabilitate a historic stone arch bridge and replace an adjacent bridge over a flood channel by David Hutchinson and Khairul Alam, Arora and Associates P.C., and Pankesh Patel, New Jersey Department of Transportation Stone Arch Bridge after rehabilitation. All Photos: Arora and Associates P.C. Partial collapse of the stone parapet and spandrel wall of the Stone Arch Bridge. The ruin wall of Worth's Mill is on the right. The Flood Channel Bridge is just beyond the ruin wall. 16 | ASPIRE Winter 2019 P R O J E C T

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