File:Sydney Metro 100,000 concrete segments

Description
Sydney Metro’s tunnel builder delivered almost 100,000 concrete segments in less than two years.

These segments were required to line the new 15.5 kilometres-long metro twin railway tunnels between Chatswood and Sydenham. Tunnel builder John Holland CPB Ghella produced the concrete segments at its Marrickville factory.

At the peak of production, one concrete segment was made every six minutes.

Six segments make up one tunnel ring. They are installed deep underground by the mega tunnel boring machines.. First published: March 2020