Susquehanna River Bridge
Location: Harrisburg, PA
Owner: Pennsylvania Turnpike Commission
General Contractor: G.A and F.C Wagman, Inc.
Value: $5.8 Million
Date Complete: June 2006
This project was for the installation of 176 shafts for the foundation of a 40-span precast concrete segmental box girder bridge. The project consisted of 156 shafts for the bridge piers with 72in rock sockets that averaged 15ft in length and 20 shafts for the bridge abutments with 42in rock sockets that averaged 10ft in length. The rock sockets were installed in sandstones and siltstones with unconfined compressive strengths as high as 25 ksi.
The project was particularly challenging as 100 shafts for the piers were located within the limits of the Susquehanna River and its fluctuating water level. All shafts were inspected for cleanliness using a shaft inspection device to ensure that no more than one inch of debris or sediment was located on the shaft bottom. Cross hole sonic logging (CSL) was performed to evaluate the presence of anomalies, defects or voids in the shaft concrete- no defects were detected during the CSL testing.