Home / Standards / GB/T 41051-2021 GB/T 41051-2021 Active Full face tunnel boring machine—Safety requirements of hard rock tunnel boring machine 全断面隧道掘进机 岩石隧道掘进机安全要求 Standard Type GBT ICS 91.220 CCS P97 Status 现行 Issue Date 2021-12-31 Implementation 2022-07-01 Responsible Dept 中国机械工业联合会 Drafting Unit N/A