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向家坝水电站工程采用分期导流方式,一期先围左岸,在左岸滩地上修筑一期土石围堰,在一期基坑中进行左岸非溢流坝段、冲沙孔坝段的施工,并在非溢流坝及冲沙孔坝段内共留设6个10米×14米(宽×高)的导流底孔及高程280米、宽115米的缺口。同时在一期基坑中进行二期混凝土纵向围堰、上下游引泄水渠等项目的施工,由束窄后的右侧主河床泄流及通航。二期围右岸,工程包括右非坝段、泄洪坝段(含消力池)、厂房坝段(含
Xiangjiaba Hydropower Station project using stage diversion, a first Wai Wai left bank on the left bank of the ground to build a first-phase earth-rock cofferdam in a foundation pit left bank non-overflow dam section, flushing sand hole section construction, In the non-overflow dam and red sand hole section, a total of six 10 m × 14 m (width × height) diversion bottom and the height of 280 meters, 115 meters wide gap. At the same time in a period of pit for two longitudinal concrete cofferdam, upstream and downstream drainage ditches and other projects of construction, from the narrow beam right after the main river bed discharge and navigation. The second phase of the right bank, the project includes the right non dam, flood dam section (including the power pool), plant dam (including