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/306846
The Pennsylvania Turnpike Commission's new Allegheny River Bridge, near Pittsburgh, is Pennsylvania's first cast- in-place balanced cantilever bridge. The bridge construction began shortly after the U.S. Open Championship at Oakmont Country Club's golf course in the summer of 2007, and the bridge construction will be completed in early 2010, ahead of the U.S. Women's Open Championship at Oakmont. The Pennsylvania Turnpike bisects Oakmont Country Club within the limits of the Allegheny River Bridge project. The existing Tur npike Bridge over the Allegheny River was opened in D e c e m b e r 1 9 5 1 a n d c a r r i e d t w o lanes of I-76 traffic in each direction. Options to both replace and repair the aging structure were evaluated prior to design of the new bridge. The narrow width of the existing bridge, projected traffic demands, and the Turnpike Commission's long-term goal of widening to three lanes in each direction led to the decision to replace the existing bridge. profile I-76 Allegheny RIveR BRIdge / NEAR PITTSBURGH, PENNSYLVANIA EnGInEER: Figg Bridge Engineers Inc., Tallahassee, Fla. ContRaCtoR and Post-tEnsIonInG ContRaCtoR: Walsh Construction Company, Chicago, Ill. ConCREtE suPPlIER: Stone and Company, Tarentum, Pa. FoRm tRavElERs FoR Cast-In-PlaCE sEGmEnts: NRS-ASIA, Norway new Pennsylvania turnpike Bridge balances aesthetics, economy, and environmental sensitivity The new bridge carries I-76 over the Allegheny River and consists of twin 2350-ft-long parallel structures for eastbound and westbound traffic with an 8-ft-wide gap between bridges to facilitate future access. The alignment of the new bridge is downstream and roughly parallel to the existing bridge, allowing two lanes of traffic in each direction to be maintained during construction and minimizing traffic impacts to Pennsylvania Tur npike customers. The contract was awarded for the project in May 2007 with a low bid of $189 million. In addition to the main river bridge, the overall Allegheny River Bridge Replacement Project also includes three overpass bridge replacements, reconstruction of the Allegheny Valley Interchange ramps and interchange bridge, construction of three major walls, approximately 2 miles of approach roadway reconstruction, and demolition of the existing bridge. t he new Bridge Variable depth concrete segmental box girders which are 26 ft deep at the by Brian Ranck, Pennsylvania Turnpike Commission and Ken Heil, FIGG ALLEGHENY RIVER BRIDGE Sustainable Design and Construction A rendering showing the finished bridge and its main span. Rendering: © FIGG. 18 | ASPIRE , Spring 2009 P R O J E C T Aspire_spr09.indb 18 3/11/09 4:15:46 PM