五强溪水电站施工导流

五强溪水电站原定采用先围右岸的三期导流方案。后因第二期推迟，经优化改为二期导流方案。第一期过水围堰挡水流量１６０００ｍ＾３／ｓ，水下施工采用预制混凝土组全模板和大型钢模，一期通航由束窄后的左侧主河槽通航；第二期围堰挡水１８０００ｍ＾３／ｓ，上游采用碾压混凝土围堰净化工作日６０ｄ，下游采用粘土心墙土石过水围堰，溢流面采用宽台阶式护面，二期通航由设置中孔坝段的临时船闸通航。

River Diversion During Construction of Wuqianxi Hydropower Station

In Wuqiangxi Hydropower Station, the original river diversion scheme was a three--staged diversion starting from the right bank . Because of postponement of project commencement, the scheme was revised into two-staged diversion through optimal design. The first--stagecofferdam was designed to hold a flow discharge of 16000m3/s. Subaqueous construction was carried out through precast concrete mould plates and large-sized steel mould plates. In the first stage, the left-hand side of the narrowed mainstream was used for navigation. The second--stage cofferdams was design to hold 18000m3/s discharge. its upstream cofferdam was a roller compacted concrete dam, while its downstream cofferdam was earth-rock overtopped cofferdam with clay core. the overflow surface was wide step facing. In the second stage, a temporary ship lock was built in the middle dam section for navigation.