CPB Contractors, with its joint venture partners Ghella and John Holland, has been selected to deliver a new metro railway crossing deep under Sydney Harbour.
The NSW Government awarded a AUD2.81 bn (USD1.59 bn) contract to deliver twin 15.5 km tunnels and associated civil works on Stage 2 of the Sydney Metro project – Australia’s biggest public transport project. The tunnels will be excavated by five tunnel boring machines (TBMs) between Chatswood and Sydenham, including a specialised TBM to build the tunnels beneath Sydney Harbour.
Design and construction works under the Sydney Metro City & Southwest Tunnel and Station Excavation (TSE) Works contract include:
• Twin 15.5 km tunnels from Chatswood to Sydenham travelling under Sydney Harbour and the CBD using five tunnel boring machines (TBMs).
• 57 cross passages approximately every 240 m between the tunnels and a temporary access shaft at Blues Point.
• Tunnel dive structures at Chatswood and Marrickville.
• Excavation of six new underground metro stations at Crows Nest, Victoria Cross, Barangaroo, Martin Place, Pitt Street and Waterloo.
• A crossover cavern at Barangaroo to allow trains to cross from one track to another.
• Design and manufacture of about 99,000 precast concrete segments to line the tunnels.
• Demolition and removal of existing buildings on the construction sites
Tunnel and station excavation works are expected to start in coming weeks with the contract to conclude in mid-2021.