大朝山水电站地下厂房洞室群，构造尺寸大而且复杂，洞挖石方量近１１０万ｍ３，工期紧。为保证总进度、工程质量及安全施工，采用了平面多工序，竖向多层次的立体施工方案。通过精心组织，已初见成效，取得了主厂第Ⅰ、Ⅱ层开挖、支护和岩壁吊车梁施工的优质成果，加快了开挖施工进度，仅在Ⅱ层开挖中就抢回工期１个月，同时完成下部开挖工程量１万ｍ３。 Dachaoshan Hydropower Station underground powerhouse caverns, large size and complexity of structure, the amount of stone excavation nearly 1.1 million m3, tight schedule. In order to ensure the total progress, the quality of the project and the safe construction, a multi-level plan and vertical multi-level three-dimensional construction plan were adopted. Through meticulous organization, it has achieved initial success and achieved high-quality results of excavation, support and construction of crane beam on the first and second floors of the main plant, speeding up the construction progress of the excavation, Duration 1 month, at the same time to complete the lower part of the excavation project 10,000 m3.