On the morning of September 27, 2020, the "Jinghua" TMB(Tunnel Boring Machine) with the largest diameter-16 meters, domestically produced was rolled off the assembly line in Changsha City, Hunan Province. After leaving the factory, it will participate in the reconstruction project of Beijing East Sixth Ring Road. It weighs 4300 tons, 150 meters. Every exvacation of the tunnel section can reach 6 floors height.
