| 伍鹤皋,高晓峰,傅丹.水电站蜗壳结构研究及应用的回顾与展望[J].水利学报,2021,52(7):770-780 |
| 水电站蜗壳结构研究及应用的回顾与展望 |
| Review and prospect in research and application of spiral case structure in hydropower plant |
| 投稿时间：2021-02-27 |
| DOI：10.13243/j.cnki.slxb.20210196 |
| 中文关键词: 水电站 蜗壳结构 埋入方式 直埋-垫层组合蜗壳 有限元法 |
| 英文关键词: hydropower plant spiral case structure embedding method of spiral case spiral case with partial membrane covering finite element method |
| 基金项目:国家自然科学基金项目（51679175） |
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| 摘要点击次数: 767 |
| 全文下载次数: 550 |
| 中文摘要: |
| 简要介绍了国内外三种水电站钢蜗壳埋入方式的应用和发展历程，对我国700 MW级水轮机蜗壳埋入方式的创新性成果进行了整理归纳，总结出水电站蜗壳结构研究中取得的三个重要进展，即蜗壳结构非线性数值分析方法、蜗壳外围混凝土配筋原则以及以机组稳定运行为核心的设计理念。针对当前蜗壳结构理论研究方面存在的不足，指出施工期水化热缝隙的形成机理、运行期温度作用效应、垫层材料长期力学特性、钢蜗壳-混凝土接触面脉动压力的传导特性，以及钢蜗壳和座环的疲劳失效是未来蜗壳结构研究需要重点关注的内容。在蜗壳新技术应用发展方面，介绍了预热膨胀构造初始缝隙和可融涂层构造初始缝隙两种新型蜗壳埋入方式。最后建议研究人员和设计人员应以持续和动态的视角看待蜗壳结构长达几十年的服役过程，充分重视结构老化累积的安全隐患。 |
| 英文摘要: |
| The application and development of three embedding methods of spiral case in hydropower plant is summarized briefly in this paper, as well as the innovative achievements on the embedding methods of spiral case of 700MW class hydro turbine in China. Three significant advances are pointed out, i.e. nonlinear numerical analysis method of spiral case structure, reinforcement calculation principle of surrounding concrete, and the design philosophy focusing on the safe and reliable operation of unit. At present, there are some deficiencies in the theoretical research of spiral case structure, and attention should be paid to formation mechanism of hydration heat gap in construction period, temperature effect during operation period, long-term mechanical properties of compressible membrane, conductive features of pulsating pressure in metal-to-concrete interface, and fatigue failure of spiral case and stay ring. Two new embedment methods of spiral case are introduced, based on thermal effect under preheating condition and fusible coating. Finally, it is suggested that the service process of spiral case structure for decades should be considered from a continuous and dynamic perspective, and full attention should be paid to the potential risk caused by structure aging. |
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