Eastern tunnel entrance construction plans
Construction of the eastern tunnel entrance will involve construction activity in South Yarra Siding Reserve, Osborne and William streets and within the existing rail corridor.
A tunnel boring machine (TBM) retrieval box will be required 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.
To construct the eastern tunnel entrance, rail tracks will need to be reconfigured between South Yarra Station and Chapel Street, and a decline structure will be built so that Cranbourne / Pakenham services can enter the new Metro Tunnel.
The works will increase the number of tracks in this area from four to six tracks. The rail corridor between William Street and Chapel Street will need to be widened for construction access and to accommodate the reconfigured tracks, and the William Street bridge will need to be demolished and rebuilt to accommodate the works.
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.
South Yarra Siding Reserve will be closed for up to four years.
Construction works are continuing within the South Yarra precinct during November and will include:
- Bored piling works
- Demolition of acquired properties
- Installation of cabling route
- Tree removal
- Site establishment works, including hoarding installation
- Service and site investigations
William and Arthur streets - Ongoing until late November
- Demolition of the properties at 5 and 7 William Street began in late October, demolition of 25 and 25A Arthur Street will begin in early November, and demolition of the buildings in the carpark on Arthur Street will begin in late November
- Ongoing works will include demolition of building exteriors, isolation and removal of utilities, removal of earth and debris, and earth compaction
- Initial demolition works are expected to generate high levels of noise, and are expected to take up to three days to complete
- All other activities are expected to generate medium levels of noise.
Rail corridor (night works) - Monday 29 October to Friday 2 November
- Trees and vegetation will be removed along the corridor to create access to underground services, and so equipment can manoeuvre safely
- Mulch and timber will be stockpiled and reused
- Works will include the use of excavators, elevated work platforms, chainsaws and mulchers
- These works are expected to generate medium to high levels of noise, and will be completed under directional lighting for workers safety.
Site establishment works and hoarding installation
South Yarra Siding Reserve - Ongoing to mid-November 2018
- Works to establish the work site at South Yarra Siding Reserve will continue
- This includes service investigations, installing the site office and workforce amenities, levelling the site, installing temporary fencing, creating access roads within the reserve and setting up environmental controls
- Generators will be used until a power supply is connected to the site in early 2019
- These works are expected to generate low levels of noise
- There will be additional truck movements to and from the site during these works.
Osborne Street - Monday 12 November to Tuesday 13 November
- The continuous flight auger (CFA) piling rig will be loaded onto a truck and taken from the Osborne Street site before 6am on Monday 12 November
- A new piling rig will be delivered to site before 6am on Tuesday 13 November. We expect these works to generate low to medium levels of noise.
Bored piling works
Osborne Street - Ongoing until early 2019
- Bored piles will be installed to construct the walls of the tunnel boring machine (TBM) retrieval shaft
- 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.
- Please note that the concrete pour for each individual pile must be continuous to ensure structural integrity. Once a concrete pour has started, it must be completed and on occasions this activity may need to continue outside normal construction hours. Every effort will be made to ensure they are completed within standard hours.
Rail infrastructure works
South Yarra Siding Reserve and William Street - Friday 2 November to mid-December 2018
- Works to install the cabling route (see terms explained on page 4) will start once initial property demolition works are complete
- Works will include digging trenches, saw-cutting and removing asphalt and installing cable conduits
- The majority of these works are expected to generate low levels of noise, with some periods of high-level noise associated with saw cutting. Nearby residents will be contacted before the start of these works.
Rail corridor (night works) - Monday 29 Octover to Friday 2 November
- Works include installing cables and foundations, conducting NDD and service investigations, removing trees and excavating trenches for cabling route
- These night works will be completed under directional lighting, for worker safety, and are expected to generate medium and occasional high levels of noise.
Rail corridor (night works) - Friday 30 November to Monday 3 December
- Works will include installing new conduits, cabling and foundations, service investigations, upgrading overhead wiring and removing some remnant vegetation
- These night works will be completed under directional lighting, for worker safety, and are expected to generate low to medium levels of noise.
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.