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在充水保压蜗壳传统简化算法的基础上提出了改进算法,据此主要分析运行工况下蜗壳进口不平衡水推力对外围混凝土应力和配筋量的影响.计算结果表明,传统简化算法未考虑不平衡水推力的作用,外围混凝土的应力和配筋量偏小,结构偏不安全.在蜗壳进口端施加不平衡水推力的做法,对设伸缩节的情况会导致直管段外围混凝土的应力和配筋量偏大,而对无伸缩节的情况则不能考虑不平衡水推力的作用.本文提出的在蜗壳进口断面下游侧转弯区域以面力的形式施加不平衡水推力的做法,对有无伸缩节的情况均能实现,可使外围混凝土的应力和配筋计算更加精确、合理,建议在充水保压蜗壳结构的设计和研究中采用.
Based on the traditional simplified algorithm of water-filled pressure-retaining volute, an improved algorithm is proposed, which mainly analyzes the influence of unbalanced water thrust on the external concrete stress and the amount of reinforcement under operating conditions. The calculation results show that the traditional simplified The algorithm does not take into account the role of unbalanced water thrust, the external concrete stress and the amount of reinforcement is too small, the structure is not safe partial pressure on the import side of the spiral pressure to do the practice of setting expansion joints will lead to the outer straight pipe section The stress and the amount of reinforcement in concrete are too large, but the effect of unbalanced water thrust can not be taken into account in the case of non-telescopic joint.In this paper, the unbalanced water thrust Practice, with or without expansion joints can be achieved, can make the calculation of external concrete stress and reinforcement more accurate and reasonable, it is recommended in the design and study of the structure of the water-filled pressure retaining scroll.