The sequence of excavation for the shaft of diversion system at Pushihe storage power station is to excavate the pioneer well used by back well boring machine, then by hand air drill to expand it.
蒲石河抽水蓄能电站引水系统中的竖井开挖，拟采用反井钻机进行导井开挖，人工手风钻钻孔扩挖的方式施工。
The key problem of the excavation of the main carven system is to determine the best excavation sequence and excavation options according to the concrete features of the project.
如何结合工程具体特点，确定最优的爆破开挖程序和开挖方法，这是主厂房系统爆破开挖的关键所在。
The excavation sequence and excavation method of the main carven system affect directly the completion date, quality, safety and cost of the project.
主厂房系统爆破开挖程序和开挖方法，最直接地影响着整个工程工期、质量、安全及成本。
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