轴流转桨式机组混凝土蜗壳调整为钢衬蜗壳后的结构与施工优化

Structural and Construction Optimization of Concrete Spiral Case of Kaplan Type Generator Unit Being Adjusted to Steel Lined Spiral Case

老挝南欧江三级水电站水轮发电机为轴流转桨式机组,其水轮机蜗壳为混凝土结构。在工程建设过程中,考虑到施工进度、混凝土蜗壳的水力损失、泥沙磨损对混凝土蜗壳的破坏等综合因素,将混凝土蜗壳优化为钢衬蜗壳。钢衬蜗壳可有效防止含砂水流长期冲刷对混凝土造成的破坏,提高蜗壳结构的耐久性,减少后期维修费用,提高机组的有效利用时效,对轴流转桨式机组混凝土蜗壳调整为钢衬蜗壳后的结构与施工优化进行了阐述。

The hydro generator of Nam Ou 3 Hydropower Station in Laos is a Kaplan type unit,and its spiral case is of concrete structure.In the process of engineering construction,considering the construction progress,hydraulic loss of concrete spiral case and the damage of concrete spiral case caused by sediment abrasion,the concrete spiral case is optimized to steel lined spiral case.Steel lined spiral case can effectively prevent the damage of concrete caused by long-term scouring of sand laden flow,improve the durability of spiral case structure,reduce the maintenance cost in the later stage,and improve the utilization efficiency of the unit.The structural and construction optimization of the concrete spiral case of Kaplan type unit being adjusted to steel lined spiral case are described.