杭州三堡排涝泵站超长流道防裂设计

Crack Prevention Design of Overlength Flow Channel of Sanbao Drainage Pumping Station in Hangzhou

杭州三堡排涝泵站系大型斜轴泵站,为解决其超长流道防裂设计难题,借助三维非稳定温度场、应力场的有限元计算方法,综合采用增加结构抗弯刚度、优化浇筑分块及浇筑顺序、添加UEA膨胀剂、掺加聚丙烯工程纤维、掺加钢纤维等结构设计手段,通过施工全过程仿真分析,有针对性地提出了不同部位的温控防裂措施。2年多实践表明,该工程流道防裂设计取得良好效果,且经历了机组运行震动的考验,可为类似大型泵站不设分缝的设计提供借鉴和参考。

Sanbao drainage pumping station in Hangzhou City is a large-scale inclined-axis pumping station.In order to solve the cracking problem of the overlength flow channel,combination methods,such as increasing anti-bending stiffness,optimizing casting block and sequence,adding UEA expansion agent,adding polypropylene fiber and steel fiber are applied for structure design.Moreover,different temperature control measures for each part were put forward during the whole construction process through three-dimensional unstable temperature field and stress field finite-element computing method.The pumping station has been completed over two years and suffered vibration load during pump running.The cracks checking result shows that the crack prevention design of this project is effective.It can provide references for the design of similar large-scale pumping station which do not set expansion joint.