Selection, Design, and Procurement of North America’s Largest Mixshield TBM for Portland, Oregon
Abstract
This paper discusses the process utilized by the Kiewit–Bilfinger Berger Joint Venture (Contractor) to select, design, and procure the largest mixshield tunnel boring machine (TBM) ever implemented in North America. The mixshield will excavate the 8,534 linear m × 6.7 m ID (28,000 linear ft × 22 ft ID) tunnel for the City of Portland Oregon’s, Bureau of Environmental Services (Owner) East Side CSO Tunnel Project. TBM selection was conducted under a preconstruction contract in which the Contractor, Owner, Construction Management Consultant and Designer collaborated on TBM selection prior to commencement of construction. This paper focuses on TBM design considerations, including the use of one versus two machines, machine configuration, extended-wear protection, hyperbaric interventions, boulder digestion, and erection of a steel-fiber-reinforced segmental lining.
2009
Rapid Excavation and Tunneling Conference (RETC) Proceedings
Christof Metzger
Kiewit–Bilfinger Berger Joint Venture
Greg Colzani
Jacobs Associates
Gary Irwin, P.E.
City of Portland Oregon, Bureau of Environmental Services
