摘要
针对充水保压蜗壳施工工艺复杂、成本高、工期长的缺点,提出了超薄垫层(1mm级,以下简称薄垫层)蜗壳的埋设新技术,并结合某抽水蓄能电站具体条件,建立了蜗壳进口断面的轴对称模型,系统比较了薄垫层蜗壳和充水保压蜗壳的传力特性,研究其替代充水保压蜗壳的可行性。研究结果表明,抽水蓄能电站采用薄垫层蜗壳时,钢蜗壳径向变形可以做到与充水保压蜗壳非常接近,而且外包混凝土的应力分布规律、承载比、配筋量等基本相同,同样可以起到降低蜗壳内水压力外传、减小外包混凝土应力和配筋的目的。为了使薄垫层方案较好地替代充水保压方案,建议薄垫层铺设厚度随蜗壳断面直径变小而逐渐减薄(1.0~0.5mm),并在蜗壳子午断面内采用尽量大的垫层包角。
Aiming at the disadvantages of complex construction process,high cost and long construction period of water-filled pressure-maintaining volute,a new embedding technology of ultra-thin cushion(1 mm class)volute is proposed in this paper.Combined with the specific conditions of a pumped storage power station,an axismetrical model of the inlet section of volute is established,and the force transmission characteristics of thin cushion volute and water-filled volute are systematically compared.The feasibility of substituting water-filled volute is studied.The results show that when thin cushion volute is used in pumped storage power station,the radial deformation of steel volute can be very close to that of water-filled volute,and the stress distribution law,load ratio and reinforcement amount of outer concrete are basically the same,which can also reduce the water pressure transfer in the volute and reduce the stress and reinforcement of outer concrete.In order to make the thin cushion scheme better replace the water-filling and pressure retaining scheme,it is suggested that the thickness of the thin cushion layer should be gradually reduced with the diameter of the volute section(1.0~0.5 mm),and the cushion covering angle should be as large as possible in the meridian section of the volute.
作者
刘帅
蔡宏江
于磊
丁宏远
伍鹤皋
LIU Shuai;CAI Hong-jiang;YU Lei;DING Hong-yuan;WU He-gao(PowerChina Zhongnan Engineering Corporation Limited,Changsha 410014,Hunan Province,China;State Key Laboratory of Water Resources Engineering and Management,Wuhan University,Wuhan 430072,Hubei Province,China)
出处
《中国农村水利水电》
北大核心
2025年第4期205-209,218,共6页
China Rural Water and Hydropower
基金
国家自然科学基金资助项目(51679175)。
关键词
充水保压蜗壳
薄垫层蜗壳
钢蜗壳变形
承载比
有限元分析
water-filled pressure-maintaining volute
thin cushion volute
steel volute deformation
load-bearing ratio
finite element analysis
作者简介
刘帅(1997-),男,工程师,硕士,主要从事水工结构设计与管理,E-mail:827563527@qq.com;通讯作者:伍鹤皋(1964-),男,教授,博士,主要从事压力管道与地下工程研究,E-mail:wbf1988@vip.sina.com。
