Northern Suburbs Transit Systems – Roe Street Tunnel

Services»Infrastructure»Roe Street Tunnel

Project: Northern Suburbs Transit Systems – Roe Street
Tunnel
Client: Main Roads WA / Westrail

The WA Government decided to build a rail link from Perth using the reserve land in the median of the Mitchell Freeway and simultaneously construct the second carriageway of the freeway. BG&E were invited to study the bridgeworks and subsequently to design a road tunnel, three road and four rail bridges.

Features:

  • The tunnel is 450m long including approaches, with 130m of roof.
  • Excavation between the wall was carried out using temporary ground anchors.
  • Secant pile walls ensured minimal disturbance of the adjacent bridge footings and extensive use of precast segments was made for the central wall and roof.
  • The main challenges were the required rapid construction, with minimal disruption to heavy traffic flows in the urban environment.
  • The tunnel passes under Roe Street and is close to the foundations of an existing bridge.

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