老挝南欧江二级水电站尾水流道模板的设计与研究

Formwork Design and Study for the Tailrace Channel of Nam Ou 2 Hydropower Station in Laos

老挝南欧江二级水电站采用3台、单机容量为40MW的灯泡贯流式机组,尾水流道由矩形断面渐变为圆形,后又由圆变方,体态不规则,承重顶板支撑较为复杂,施工难度大。现场施工进行了钢桁架排架方案和钢管扣件排架方案的比较,最终决定采用两种方案结合的方式,既加快了进度,又节约了施工成本,同时保证了流道的成型质量。介绍了其设计过程。

Three bulb tubular units with a capacity of 40 MW per unit are installed in Nam Ou 2 Hydropower Station in Laos. The tailrace channel has irregular shape which is gradually changed from rectangular section to circular section, and then from circular to square. The supporting of load-bearing roof is complex and difficult to construct. The comparison between steel truss bent scheme and steel tube fastener bent scheme is made at site construction, and finally, the combination of the two schemes is adopted, which not only speeds up the progress, but also saves the construction cost, and ensures the forming quality of the channel simultaneously. The design process is introduced.