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 works are continuing within the South Yarra precinct during January and will include:
- Piling works
- Track works, including track, overhead structure and crushed rock removal and installation
- Demolition and earthworks
- Signalling removal, protection and installation
- Service investigations
- Retaining wall construction
- Installation of fencing and spoil containment barriers
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.
Rail corridor – Toorak Road to Chambers Street (24-hour works) - Tuesday, 1 January to Saturday, 12 January
- Temporary piling platforms will be constructed at the start of this work, and demolished at the end
- Piling will be undertaken along the Cranbourne /Pakenham and Frankston rail corridor, to support the installation of overhead line structures and construction of the entrance into the Metro Tunnel
- One pile will be installed in the Sandringham corridor from 7pm to 7am on Thursday, 3 January
- These works are expected to generate medium to high levels of noise, and there will be an increase in the number of trucks accessing the site
Rail corridor – Toorak Road to Chapel Street (24-hour works) - Tuesday, 1 January to Friday, 4 January; Tuesday, 8 January to Monday, 14 January
- Existing overhead line structures and track will be removed, and new overhead line structures, track and a rail access pad installed. Crushed rock on the tracks will be pushed to the side or removed, and replaced after the new track is laid
- These works are expected to generate medium levels of noise, with some periods of high noise levels and dust as steel is moved along the track and track crushed rock is compacted
Demolition and earthworks
South Yarra Siding Reserve, Arthur Street and rail corridor – Toorak Road to Chambers Street (24-hour works) - Thursday, 3 January to Tuesday, 8 January
- These works will include demolition of the carpark on the northern side of Arthur Street, and the excavation and construction of access roads to the rail corridor at Arthur Street and South Yarra Siding Reserve
- These works are expected to generate medium to high levels of noise
Rail corridor – South Yarra Station to Hawksburn Station (24-hour works) - Tuesday, 1 January to Friday, 4 January; Tuesday, 8 January to Monday, 14 January
- Existing signals will be removed or protected, and new signals installed along the rail corridor
- These works are expected to generate low levels of noise, with the occasional use of hand tools generating medium levels of noise
Rail corridor – Garden Street to Cromwell Road - Thursday, 3 January to Friday, 11 January
- These works will involve non-destructive digging, the use of an excavator and the reinstatement of crushed rock on the track. Non-destructive digging uses pressurised water to break up soil and vacuums the soil to expose assets and services located underground without damaging them
- These works are expected to generate low to medium levels of noise, with intermittent periods of high noise as crushed rock is reinstated and compacted
Retaining wall construction
Rail corridor – between William Street and Chambers Street (24-hour works) - Sunday, 6 January to 7pm Sunday, 13 January
- A new, temporary retaining wall will be constructed on the south side of the rail corridor to support future piling works
- Works will involve excavating and removing spoil, installing bored piles using a piling rig and concrete trucks, installing precast panels and backfilling the new wall
- These works are expected to generate high levels of noise
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
Containment and safety fencing
Rail corridor – Toorak Road to Chapel Street (24 hour works) - Sunday, 6 January to Wednesday, 9 January
- Containment and safety fencing will be installed along the rail corridor, including at the northern edge of Arthur Street
- These works will include the use of excavators and hand tools
- These works are expected to generate low to medium levels of noise, with intermittent periods of high noise
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
Railway Place, Hopetoun Grove and Palfreyman Street - Thursday, 3 January to Thursday, 10 January
- Parking will be temporarily removed and vehicle access restricted on Railway Place, Hopetoun Grove and Palfreyman Street (north of Garden Street), to allow safe access for construction vehicles
- Traffic management will be in place to support the safe movement of pedestrians and cyclists through the area
- Vehicle access to some properties will be restricted – we will contact impacted residents with more detailed information in late December
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.