Rehabilitation and Resetting:
Singer Road Bridge over the Heritage Rail Trail
York County Bridge No. 274 - Singer Road Bridge
Exceptional design. Extraordinary service.
C.S. Davidson, Inc. investigated various design options for York County Bridge No. 274 on Singer Road over the Heritage Rail Trail in New Freedom Borough. The existing structure is a single-span, 64 ft long, Warren truss bridge originally built in 1905 and last rehabilitated in 1995. The bridge became eligible for listing on the National Register of Historic Places in 2017, partly due to the dwindling number of Warren truss bridges remaining in Pennsylvania.
The rehabilitation of the existing structure was determined to have the least adverse effect on the historical integrity of the bridge due to its limited scope of repair work and to be the most cost-effective and prudent design solution due to a series of design and regulatory issues.
Cranes are used to lift the truss back into place
How was it done?
The repair work was performed to improve the load-carrying capacity of the bridge and its overall safety. The truss was lifted and set near the bridge during construction to inspect the bridge components closely and to perform repairs safely. The scope of repair and rehabilitation items includes, but is not limited to:
Blast, clean, and repaint truss structure
Install concrete barriers inside the truss to improve safety
Replace all existing, deteriorating stringers, floorbeams, and the deck
Repair fracture critical members, including bottom chords and diagonals
Replace all truss bearings
Replace concrete bearing seat and backwall at each abutment - the bearings rest on existing ashlar stone masonry abutments
Coordination with stakeholders included York County Commissioners, York County Public Works, New Freedom Borough, the York County Rail Trail Authority, Northern Central Railway (formerly Steam into History), the Grade Cross Unit (GCU) of PennDOT District 8-0, District 8-0 Bridge Division, and the Rail Safety Unit of Pennsylvania Public Utility Commission (PUC).
The project successfully satisfied the needs of the project to improve safety and to preserve one of the few remaining truss bridges in central Pennsylvania built more than 100 years ago.