Shaft Design and Construction Support Services:
Gall Zeidler Consultants provided an alternative shaft arrangement study, detailed design, specifications, structural design calculations, instrumentation, monitoring, and construction phase services for a shotcrete lined, 26 foot (8 meter) diameter shaft with underpinning of an existing steam tunnel. The shaft provided access for the removal of an 8 foot (2.4 meter) diameter soft ground Tunnel Boring Machine (TBM). Shaft excavation and support were based on New Austrian Tunneling Method (NATM) principles.
