The Pedestrian Walkback Tunnel at Washington Dulles International Airport (IAD) provides a connection between IAD’s main terminal and midfield Concourse B terminal.
Tunnel Design and Construction Support:
Gall Zeidler Consultants (GZ) provided the design for the final shotcrete lining for the tunnel junction structure of the pedestrian walkway tunnel and adjoining utility tunnel. The tunnel was constructed beneath taxiways under shallow cover using the New Austrian Tunneling Method (NATM). GZ provided construction support during the installation of the final (inner) shotcrete final lining (SFL) after a closed wraparound PVC membrane waterproofing system was in place.