"Yong'an" is a large diameter dual-mode Tunnel Boring Machine. Excavation diameter is 14.29 meters.

It was produced for boring 3963.5 meter shield section of the Guifengshan Tunnel.

TBM has has pre -geological forecast system, tool wear monitoring system, slag volume measurement system, shield tail gap measurement system, pipeline intelligent transportation, visualization, oil monitoring, vibration monitoring and early warning.

http://finance.people.com.cn/BIG5/n1/2023/0808/c1004-40052804.html