People inform "Qiangguo" is super large (13.27 meter) diameter Slurry TBM. China Railway 22nd Bureau and China Railway Construction Heavy Industry Co., Ltd. build it. It arrive at project on November 20.

TBM has many technology advancements. Very precise atmosphere pressure will stop overexcavation.

It will excavate Qianhuang section of the Guangzhou-Dongguan-Shenzhen intercity railway for 3511 meter. Excavation diameter 13.27 meter good for double-lane tunnel. Geology is very difficult.

http://finance.people.com.cn/BIG5/n1/2022/1121/c1004-32570497.html