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在我国甘肃省永登县境内的引大入秦工程,需开挖总干渠87km(包括开挖隧道75km),把大通河水引入秦川灌溉,引水流量为32m~3/s。其中30A隧道长11.6km,隧道主要穿越地层为第三系地层,含漂石砾岩、泥质砂岩,岩层松散易崩解。 30A隧道工程,由意大利CMC公司中标承建,该公司采用美国罗宾斯工厂生产的180型伸缩式双盾构掘进机进行施工,1990年12月正式掘进,至1991年8月下旬已掘进7 500m,最高日进尺达65.6m,最高月进尺为1 300m。
In the project of invading the Qin River in Yongdeng County, Gansu Province, 87km of the main canal (including excavation tunnel 75km) should be excavated to introduce Datong River into Qinchuan irrigation with a water diversion flow of 32m 3 / s. Among them, 30A tunnel is 11.6km long. The tunnel mainly crosses the strata into the Tertiary strata, including boulders and shaly sandstone, which are easily disintegrated. 30A tunnel project by the Italian company CMC bid construction, the company used the United States Robbins production plant 180 telescopic double-shield boring machine construction, formally heading in December 1990 until late August 1991 has been driving 7 500m , The maximum daily footage reached 65.6m, the maximum monthly footage into 1 300m.