三峡电站蜗壳敷设软垫层浇筑外围混凝土研究  

Research on installing a soft cushion layer for placing concrete surrounding the spiral case of TGP powerplant

作　　者：李丹 陈坪[1] 

机构地区：[1]长江水利委员会设计院,湖北武汉430010

出　　处：《人民长江》2004年第4期1-3,共3页Yangtze River

摘　　要：三峡电站厂房蜗壳外围混凝土结构由于其几何形态的奇异而成为三峡电站厂房结构中最复杂的结构之一。蜗壳外围混凝土结构在水电站中既是水轮发电机和钢蜗壳的支承体,也是主厂房上部结构的基础。在该结构设计中既要充分发挥钢蜗壳的承载能力,又要满足机组的安全稳定运行以及蜗壳外围混凝土结构的安全;并且还应该具有施工方法较简便、施工质量容易保证、工期较短等综合效益。因此在三峡水利枢纽工程单项技术设计阶段,长江水利委员会推荐的是电站厂房蜗壳采用敷设软垫层后浇筑外围混凝土的蜗壳埋入方案(简称垫层方案)。但由于像三峡电站这种单机容量700MW的巨型水电站在国内外尚无采用垫层方案的工程实例,因而在三峡工程单项技术设计审查阶段是有争议的。目前三峡电站左岸厂房采用的是保压浇筑蜗壳外围混凝土的方案,但是垫层方案以其混凝土结构承担内水压力小、施工方便、工期短、造价低等优点,在三峡电站建设中是保压浇筑蜗壳外围混凝土方案所难以替代的。因此对于垫层方案应该在单项技术设计的基础上做更进一步的研究。The concrete structure surrounding spiral case of the Three Gorges power station's powerhouse becomes one of the most complicated structures of the powerhouse for its queer geometric figuration. The concrete structure surrounding spiral cases is the supporting mass of turbine generators and steel spiral cases, and is also the foundation of the upper structure of the powerhouse. The design of this concrete structure should take account of: ① giving full play to the bearing capacity of steel spiral cases; ② satisfying requirements for the safe and stable operation of generating units and for the concrete structure's safety; ③ having a comprehensive benefit of simple construction method, easily guaranteing construction quality and short construction period. In the technical design of individual items of the Three Gorges Project, Changjiang Water Resources Commission put forward a spiral case embedment scheme of placing concrete surrounding spiral cases with a soft cushion layer placed directly on the external surface of spiral cases. This scheme is characterized by small part of internal water pressure acting on the concrete structure, simple construction method, short construction period and low construction cost, etc. Although this scheme is not adopted for TGP left power plant, it would be worth investigating further.

关 键 词：电站厂房 蜗壳外围混凝土结构 垫层方案 结构分析 三峡水利枢纽 

分 类 号：TK730.301[交通运输工程—轮机工程]