Liberty Tunnel Rehabilitation Project Pennsylvania Department of Transportation

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Liberty Tunnel Rehabilitation Project Pennsylvania Department of Transportation Location: Pittsburgh, Pennsylvania USA Date: 2012 – 2013 Structure: Two twin tunnels Length: 5,888 feet (1,795 meters) each Cross-Section: 27 feet (8.2 meters) at springline Geology: Conemaugh Group, including Glenshaw and Casselman formations (cyclic sequences of sandstone, shale, red beds, limestone and coal; Monogahela Group (cyclic sequences of shale, limestones, sandstone and Figure 1. Liberty Tunnel. coal; Pittsburgh Coal Cost: -- Client: Swank Construction Company Owner: Pennsylvania Department of Transportation (PennDOT) Liberty Tunnel Rehabilitation Design Services: ITA (International Tunneling Award) 2014 Award Winner for “Rehabilitation Project of the Year” he Liberty Tunnel consists of two 5,888-foot (1,795-meter) long Ttubes, which run through Mount Washington in Pittsburgh, Pennsylvania. The tunnels provide a direct route to downtown Pittsburgh from the South Hills suburbs, easing traffic flow between the two locations. The Liberty Tunnel was opened to traffic in January 1924 and has gone through a series of upgrades and repairs. Gall Zeidler Consultants (GZ) provided the rehabilitation design for the tunnels’ aging ventilation arch walls. The ventilation arch walls act as tunnel-shaped jet structures for fresh air supply to the inside of the tunnel. GZ provided an Figure 2. Preparation of a Center Arch section. alternative design for the replacement of the arch walls in-lieu of the original contract design that proposed the use of self- consolidating concrete for the ventilation arch walls and support the arch walls with radial hangers that were tied to the structural tunnel arch above. The porposed alternative concept used a self-bearing shotcrete arch wall and embedded lattice girders, which avoided the utilization of the radial hangers as well as the cast-in-place, self-consolidating concrete. The alternative shotcrete concept provided the Contractor with a schedule and cost saving solution under the given tight construction window allowed during a complete shutdown of the tunnels. www.gzconsultants.com.

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