Transportation
| Tue 16 Jun 2026
Beijing, June 16 -- China Railway Tunnel Group has submitted a patent application for Steel Arch Frame Wall Back Guniting Blind Area Filling Device and Method. This invention was developed by Wang Yue, Deng Youqi, Guo Yongjie, Wu Yi, Wang Zhenlong, Zhou Song, Xie Tao, Yang Zhi, Liu Shanyi, Li Zhijun, Jin Wenjie, Sun Feixiang, Zh..