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“老黄土铁路单线隧道减薄村砌和喷锚支护新技术鉴定会”于1981年1月14日至21日在西安铁道部第一工程局召开。会议由铁道部科技局会同鉴定委员会和基建总局主持。参加会议的包括路内施工、设计、
“Old Loess Railway single tunnel thinning village puzzle and spray anchor support appraisal of new technology” in January 1981 January 21 to 21 in Xi’an Railway Bureau Engineering Bureau held. Meeting by the Ministry of Railways Science and Technology Commission and the Identification Commission presided over by the General Administration of Construction. Participate in the conference including road construction, design,