PROJECT DESCRIPTION: The Liberty Tunnel provides direct four-lane route from downtown Pittsburgh to the South Hills suburb and after nearly a century in service, the Pennsylvania Department of Transportation had the mile-long, U-shaped tunnel rehabilitated. The demolition and renewal of the arch walls inside the tunnel originally called for cast-in-place concrete using the existing steel framing hangars. However, uncertainly about the structural integrity of the deteriorated hangars led Coastal Gunite and Swank Construction to replace the cast- in place concrete design with a self-bearing arch concept using spray-apply QUIKRETE ® Shotcrete MS - Fiber Reinforced. Traditionally used to extend the underground section of a mined tunnel with a free-standing arch at the portal ope

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