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水电站金属蜗壳外围结构是指水轮机层以下二期砼范围内的钢筋砼结构 ,是一个整体性很强的空间结构 .其体形复杂 ,除了可用三维有限元法分析其空间应力状态外 ,还没有精确的方法可用以计算外围结构的内力 .目前外围结构设计中 ,一般采用平面框架力学法计算内力 .一些大流量电站由于转轮直径大 ,蜗壳进水管直径大 ,而座环尺寸小 ,座环处砼连结不可靠 ;若座环视为一不动铰 ,采用外周边固结计算时 ,蜗壳外周边固端配筋有可能不足 .今提出按外周边固定 ,内周边自由的板予以计算 ,能较好地解决问题
The external structure of the metal volute of a hydropower station is a reinforced concrete structure within the scope of the second phase concrete below the turbine layer and is a highly integrated space structure with complicated body shape and no spatial stress state except that it can be analyzed by three-dimensional finite element method Accurate method can be used to calculate the internal forces of the peripheral structure.Currently, the external force is applied to calculate the internal forces in the peripheral structure design.A number of high-flow power stations have large diameter of the rotor and large inlet diameter of the volute, If the seat ring is regarded as an immovable hinge, the reinforcement around the outer periphery of the volute may be insufficient when using the calculation of the outer circumference consolidation. It is proposed that the outer periphery should be fixed and the inner periphery should be free , Can better solve the problem