Transportation
Project
A 3.1-mile underground extension of the Market Street subway, delivering twin bored tunnels, three underground stations and a cavern beneath an operating city centre.
Design and construction management support for one of the most technically demanding urban transit projects of its kind.
The alignment threads beneath a seismically active, building-occupied corridor, requiring low-vibration tunnelling, groundwater control and continuous settlement monitoring. Our teams delivered excavation support design, shaft and station structures, and construction phase engineering through to handover.
Scope of work
- Tunnels & Underground Engineering
- Construction Management
- Geotechnical Engineering
Project facts
- Length
- 3.1 miles
- Tunnels
- Twin bored
- Stations
- 3 underground
- Completion
- 2022
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