East Sixth Ring Road Project by Shoufa Group Shoufa Construction Company in Tongzhou District, Beijing. 16.3 kilometers. 4 Interchanges, 9 widened bridges and a bridge-to-tunnel ratio of 59.92%. Tunnel 9.2 kilometers.

East Sixth Ring Project of China Railway 14th Bureau use super large-diameter Tunnel Boring Machine "Jinghua" diameter 16.07 meters. Error must be controlled within 5 cm, which makes the construction difficult informs Peoples Daily.

http://finance.people.com.cn/BIG5/n1/2021/0710/c1004-32154140.html