Knowles Avenue Pedestrian Tunnel
Glenolden Borough, Delaware County, PA
TPD performed the construction inspection of the Knowles Avenue Pedestrian Underpass Project in Glenolden Borough, Delaware County.
The project involved the installation of a cast-in-place pedestrian tunnel, 51-feet in length. The structure included cast-in-place wing walls and headwalls which were finished with architectural surface treatment and metal handrails.
The project required a 24-hour continuous tunneling operation for seven days under an active CSX rail line. Through-out the construction, monitoring of the track settlement, vibration, and train flagging were required.
A concrete walkway through the tunnel, excavation, grading, lighting, conduit, and E&S controls were also part of the construction activities. TPD inspected the project with PennDOT’s oversight. The federally-funded, locally-sponsored project was administered through CDS/NextGen and ECMS.