Precast concrete segments will be used in Sydney’s new metro rail as a mega concrete factory begins full production mode in Marrickville.
The first of 99,746 concrete segments has come off the production line, and will be used to line the 15.5 kilometres twin metros railway tunnels from Chatswood to Sydenham, including under the Sydney Harbour.
Six concrete segments will make up one tunnel ring, which is installed underground by a tunnel boring machine as it moves forward. Each tunnel will be lined with 16,451 concrete rings.
The specialised concrete factory in Marrickville produces one four-tonne segment every six minutes.
Most of the equipment at the factory was used to make the concrete segments for the Sydney Metro Northwest project, which opens to customers in the first half of 2019.
The north west project used 98,180 segments to line the twin 15 kilometres tunnels from Bella Vista to Epping.