CIMIC Group company CPB Contractors has secured a contract to build a new metro railway crossing under the Sydney Harbour at New South Wales, Australia, in collaboration with its joint venture (JV) partners.

The A$2.81bn ($2.12bn) deal was awarded by the Government of New South Wales, and involves the construction of twin tunnels and associated civil works on Stage 2 of the Sydney Metro project.

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Works outlined in the contract include the construction of twin 15.5km tunnels from Chatswood to Sydenham using five tunnel boring machines (TBMs), which will travel under Sydney Harbour and the CBD. 

Nearly 99,000 precast concrete segments will also be manufactured to line the new tunnels.

The scope of work also includes construction of 57 cross passages to be placed approximately every 240m between the tunnels, a temporary access shaft at Blues Point, tunnel dive structures at Chatswood and Marrickville, a crossover cavern at Barangaroo and the demolition of existing buildings near the construction sites.

"Our team is focused on ensuring that all objectives for this significant major project are achieved, including sustainable design and construction methodologies."

The JV partners will also excavate six new underground metro stations at Crows Nest, Victoria Cross, Barangaroo, Martin Place, Pitt Street and Waterloo.

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CPB Contractors managing director Román Garrido said: “Our team is focused on ensuring that all objectives for this significant major project are achieved, including sustainable design and construction methodologies, opportunities for local workers and businesses, and a socially inclusive procurement strategy.”

CIMIC Group noted that the tunnel and station excavation works are scheduled to start in the coming weeks, with the contract currently expected to conclude in mid-2021.

CPB Contractors and joint venture partners previously completed tunnels and station civil works for the A$8.3bn ($6.29bn) Sydney Metro Northwest project (Stage 1 of Sydney Metro) in June last year, seven months ahead of schedule.

CPB Contractors holds 45% of the JV, which also includes John Holland (45%) and Ghella (10%).

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