文章摘要
张运良,马震岳,程国瑞,陈婧.水轮机蜗壳不同埋设方式的流道结构刚强度分析[J].水利学报,2006,37(10):1206-1211
水轮机蜗壳不同埋设方式的流道结构刚强度分析
Strength and stiffness analysis of spiral casing with different embedded manners
  
DOI：
中文关键词: 水利水电工程  蜗壳  埋设方式  伸缩节  止推环  数值模拟
英文关键词: hydroelectric engineering  spiral case  embedding manner  expansion joint  anti thrust ring  numerical simulation
基金项目:
作者单位
张运良 大连理工大学 土木水利学院，辽宁 大连 116024 
马震岳 大连理工大学 土木水利学院，辽宁 大连 116024 
程国瑞 大连理工大学 土木水利学院，辽宁 大连 116024 
陈婧 大连理工大学 土木水利学院，辽宁 大连 116024 
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中文摘要:
      对蜗壳三种典型埋设方式，采用有限元方法分析和讨论了设置伸缩节与止推环对某巨型蜗壳结构整体受力特征和变形特性的影响，并对各方案进行了评价。研究表明，(1)从降低混凝土拉应力和提高钢衬承载比来看，垫层方案优于保压方案，保压方案优于直埋方案。从流道系统的变形来评价，直埋方案优于垫层方案和保压方案。但从蜗壳外包混凝土的整体变形来看，直埋方案则劣于垫层方案。(2)无论是对于垫层方案或是保压方案，是否设置伸缩节和止推环对蜗壳应力状态影响均较小。同时设置或取消伸缩节和止推环，从流道系统钢结构的整体轴向刚度和抗扭转刚度来评价，垫层方案比保压方案有所降低或基本相当。(3)对于垫层方案，若取消伸缩节，可考虑取消止推环。对于保压方案，若设置伸缩节，则建议设置止推环。本文可为蜗壳埋设方式的优化选择提供参考。
英文摘要:
      For three typical manners of steel spiral casing (SC) embedded in concrete, i. e., manner of SC embedded in concrete with soft cushion layer (MSCL), manner of SC embedded in concrete while holding a certain water head inside SC (MHWH) and manner of SC embedded directly in concrete (MD), the influence of setting up of expansion joint and anti thrust ring on the stress and deformation distributions of a giant SC and its surrounding concrete was analyzed by FEM and thereafter these three manners were evaluated. Some conclusions are (1) Evaluated from decreasing concrete tensile stress and increasing SC bearing ratio of water pressure, MSCL is better than MHWH and MHWH is better than MD. Evaluated from deformation of steel structures, MD is better than MSCL and MHWH. However, evaluated from deformation of concrete, MD is worse than MSCL.(2)For MSCL and MHWH, the setting up of expansion joint and anti thrust ring will not much affect the stress distributions of SC and surrounding concrete. Evaluated from structural integrated stiffness, MSCL is equivalent to or a little weaker than MHWH. (3) For MSCL, if setting up of expansion joint is concelled, the anti thrust ring maybe cancelled. For MHWH, if expansion joint is set up, it is suggested that the anti thrust ring be set up. This paper can be a reference for the optimal choice of embedding manners for SC.
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