Standard practice for these key procedures for tunnel construction, don’t tell me you still don’t know

Standard practice for these key procedures for tunnel construction, don’t tell me you still don’t know Tunnel excavation, hollow bolt grouting quick joint, shotcrete, steel arch overall processing, connecting plate processing and installation, second lining steel installation, waterproof treatment, two-line concrete, lining concrete health, cable trench and drainage ditch, etc.What should be done with standard…