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317工程是青城子铅矿东部运输系统改造工程。全工程分为三个时期施工,第一期工程为317坑门和榛子沟坑副井-120米中段西部的相向掘进,贯通距离2400米。1977年10月开始施工,1979年6月准确贯通。贯通实际偏差:平面方向±0.107米;高程偏差±0.024米。由于青城子铅矿开采年限较长,测量座标系统多,测量资料和测点的损失严重,以及地震对测点的影响等,我们在施工中进行
317 project is Qingchengzi lead eastern transport system transformation project. The whole project is divided into three periods of construction, the first phase of the project is 317 pit gate and hazelnut trench pit auxiliary well - 120 meters west of the middle of the tunneling, through the distance of 2400 meters. Construction began in October 1977 and was accurately completed in June 1979. Through the actual deviation: ± 0.107 m in the plane direction; elevation deviation ± 0.024 m. As a result of Qingchengzi lead mining period of a long time, measuring coordinate system, measurement data and measuring point of serious loss, as well as the impact of earthquakes on the measuring point, we carried out in the construction