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North Shore Connector

Alternative NATM tunnel design, cost estimate & finite element analysis.
Estimated cost: Commencement:
July 01, 2002
Completion date:
January 01, 2008
Alpha Dr, Harmar Township
Pittsburgh, PA 15238
United States
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.

Geology description:

Fill, alluvium (granular and cohesive), fluvioglacial deposits and bedrock.

Geology types:
Bid cost: Final cost:
$7.6 million USD
Service areas:
Construction methods:

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.

Project overview
Cut-and-Cover method