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一、施工概况由浙江省地矿局第四地质大队承包的杭州市西湖引水隧洞工程（北端），自1985年2月1日开工后，经过七个月的努力，于1985年11月4日完成所承包的843.8米的隧洞开挖任务（施工中因建设单位的影响窝工二个月）。平均月进尺124.43米，最高月进尺149.90米，创全局历史最高纪录。在这条断面为6～8米~2，长805米的隧洞中，我们采用中深机械化作业线，配合新的施工工艺和方法，在生产效率和经济效益方面取得了可喜成绩。
I. Construction Overview After the commencement of construction on the West Lake Diversion Tunnel (northern end) of Hangzhou City, which was contracted by the Fourth Geological Unit of Zhejiang Bureau of Geology and Mineral Resources, after seven months of hard work, on November 4, 1985 Completion of the contracted 843.8 m of the tunnel excavation task (construction due to the impact of construction units nest work two months). The average monthly footage of 124.43 meters, the maximum monthly footage of 149.90 meters, the highest record in the history of the whole world. In this tunnel of 6 ~ 8m ~ 2 in length and 805m in length, we have adopted the medium-deep mechanized operation line, with new construction techniques and methods, and achieved encouraging results in terms of production efficiency and economic benefits.