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North Shore Connector
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| Service: | Alternative NATM tunnel design, cost estimate & finite element analysis.
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| Estimated cost: | Commencement: | July 01, 2002
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Completion date: | January 01, 2008
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| Location: | Alpha Dr, Harmar Township Pittsburgh, PA 15238 United States |
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| Technical data: | NATM running tunnel connecting Convention Center station with surface to be constructed beneath historic downtown structures as part of existing LRT system expansion. Provided initial design package, including detailed cost estimate. Tunnel Length: ~446'* Cross Section: 41'-4" x 26'-11"; 895.24 ft^3 *Including widening zone for track cross-over. |
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| Geology description: | Fill, alluvium (granular and cohesive), fluvioglacial deposits and bedrock. |
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| Bid cost: | Final cost: | $7.6 million USD
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Description
The North Shore Connector Project consisted of three underground station structures and running tunnels, excavated with TBM and Cut-and-Cover tunneling methods. It also included a twin bore tunnel under the Allegheny River. Dr. Sauer and Partners provided design review and design support services. The development of the waterproofing system for underground structures including tying into an existing station using a flexible membrane system, combined with a sectioning system that allows for section grouting instead of the entire structure if a leak is detected was also provided.
