On site at the USA’s Dulles Airport where
we designed 20km of subapron tunnels

The US$3.4 billion development programme at Dulles will improve its ability to handle increased airport traffic. The programme includes a network of tunnels for new systems including an automated people mover (APM) system, a pedestrian tunnel, utility tunnels, underground baggage conveyors and underground roads
for airport tugs.

Hatch Mott MacDonald’s role during phase 1 included detail design and design management for the APM, baggage and tug tunnels. The scope of work involved tunnel structures, mechanical/electrical systems, ventilation systems and fire/life safety design for all tunnels and the vehicle maintenance facility (VMF). Hatch Mott MacDonald also managed the design of the security and communication systems for the tunnels and vehicle maintenance facility.

Following the events of 9/11, Dulles was required to re-evaluate its construction plans. Construction was completed on the initial segment of the APM tunnels, the main terminal APM station and concourse B and C APM stations, and the VMF.

For phase 2 of the programme – following the post 9/11 re-evaluation – Hatch Mott MacDonald is leading a team of ten sub-consultants to complete the design of the 1875ft long, 40 ft wide NATM pedestrian tunnel extension; the 2800ft long, twin 35ft diameter TBM tunnels that link to a 700ft long cut-and-cover tunnel for a baggage conveyor system; and a 2400ft long extension of the APM twin NATM tunnels.