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我局自1964年开始，在槽探和平基修路工作中使用内燃凿岩机。通过技术培训和生产实践，一些坑组逐步掌握了内燃凿岩机的操作、维护、保养和检修技术。1967年后，先后有五个队把内燃凿岩机使用于铜、锰、铁、锡、磷矿普查坑道和支农找水坑道。岩、矿石硬度一般4—7级，部份石英岩、矽卡岩为8—9级。坑道断面为2.7平方米。坑深一般在200米以内，最深坑道为235米。所施工的坑口多位于海拔2000—3000米的高山地区，地势陡峻，一般都无公路可通，有的要步行四天才到矿区，交通很不方便。到
Since 1964, our bureau has used internal combustion rock drills in the work of trenching and peace-based roads. Through technical training and production practices, some pit groups gradually mastered the operation, maintenance, maintenance and overhaul technologies of internal combustion rock drilling rigs. After 1967, five teams successively used the internal combustion rock drilling rig for the cofferdam for copper, manganese, iron, tin and phosphate mines and the watering tunnel for agriculture. Rock, ore hardness generally 4-7, part of quartzite, skarn 8-9 level. Tunnel section of 2.7 square meters. Pit depth is generally within 200 meters, the deepest tunnel is 235 meters. The construction of the Hang Hau and more located at an altitude of 2000-3000 meters in the mountains, the steep terrain, generally no roads accessible, and some to walk four days to the mine, the traffic is very convenient. To