Eastern tunnel entrance construction plans
The eastern tunnel entrance will be located in the South Yarra Siding Reserve. A decline structure, or descending tracks, will be built so trains can enter the new Metro Tunnel near William Street and pass underneath the Sandringham and Frankston lines.
To construct the eastern tunnel entrance, the rail corridor between William and Chapel streets will need to be widened, and the train tracks reconfigured to allow two additional tracks to be constructed. These new tracks will then enter the new Metro Tunnel.
The decline structure and tunnel entrance are proposed to be built via a 'cut and cover' method, which will see them excavated from the top down and the surface then reinstated over the top of the tunnels.
A tunnel boring machine (TBM) retrieval box will be constructed in the rail reserve between Osborne Street and the existing Sandringham line. TBMs will be used to create the tunnels linking the eastern tunnel entrance to Anzac Station and the rest of the network.
These tunnels will pass under Osborne Street, Davis Avenue, Powell Street, Myrtle Street and Macfarlan Street and travel west under Toorak Road and St Kilda Road to connect with the new Anzac Station.
South Yarra Siding Reserve will be closed for up to four years.
Construction Snapshot for 2019
Osborne Street - Ongoing until early 2019
- Piling to construct the walls of the tunnel boring machine (TBM) retrieval shaft will continue
- These works are expected to generate medium to high levels of noise
- Excavation works to allow the next level of piles to be installed will commence in late January
- Please note that the concrete pour for each pile must be continuous to ensure structural integrity: once a pour has started, it must be completed. On occasions, this activity may need to continue outside normal construction hours.
Arthur Street - Monday, 14 January to late February
- Piling pads will be constructed and piles installed in Arthur Street, next to the rail corridor, ahead of construction of the eastern tunnel entrance later in 2019
- These works are expected to generate high levels of noise during normal construction hours
Road closures and parking changes
Arthur Street - Tuesday, 1 January to Monday, 14 January; Monday, 21 January to mid-March, 2019
- Arthur Street will be closed to vehicles between Chapel and William streets during early January, to enable the safe demolition of the Arthur Street carpark and construction of a retaining wall in the rail corridor
- From late January, the same section of Arthur Street will be closed so that piles can be installed along the southern boundary of the rail corridor. Exact closure dates and access information will be provided to Arthur Street residents in mid-January.
Key construction activities
It is estimated that construction of the eastern tunnel entrance will take around three years. Key construction activities will include:
- Preparatory works including land clearing and relocation of utilities including electrical, gas, water and telecommunications services.
- Demolition of acquired buildings.
- Construction works to widen the rail corridor to accommodate additional tracks, including demolition of the William Street bridge.
- Excavation of the decline structure and tunnel entrance construction, including retaining walls.
- Construction of the ventilation shaft, emergency access and a power substation in Osborne Street Reserve.
- Construction of a TBM retrieval box.
- Track works and the installation of signalling and communications systems.
- Site remediation including rebuilding the William Street bridge and upgrading shared spaces including South Yarra Siding Reserve, Osborne Street Reserve and Lovers Walk.