三峡左岸电站厂房尾水管封闭块回填时间探讨  

Preliminary study on filling time of enclosure blocks of draft tubes in Three Gorges powerhouse

作　　者：郭伟[1] 侯俊平[1] 李永红[1] 

机构地区：[1]长江水利委员会设计院,湖北武汉430010

出　　处：《武汉大学学报（工学版）》2001年第4期39-43,共5页Engineering Journal of Wuhan University

摘　　要：水电站尾水管为大截面混凝土框架结构 ,在施工期由于水泥水化热及外界气温的变化 ,框架内将产生较大的温度应力 .为了减小框架内的温度应力 ,通常在肘管段和扩散段顶板设置封闭块 ,封闭块回填时间宜在每年11月至次年 4月的低温季节 .以三峡左岸电站厂房 2号机尾水管为例 ,针对现行设计及实际施工情况 ,从理论上探讨了适当延长封闭块回填时间至次年 5月的可能性 ,对实际施工组织具有一定的指导意义 .The draft tubes for the Three Gorges powerhouse are of large_sized frame structures. During construction, hydration heat as well as changing of ambient temperature causes big temperature stresses in the structure. Customarily, to reserve enclosure blocks in the top floor of the divergent section and the elbow section is made so as to lower the temperature stresses in the frame. The proper filling time of enclosure blocks should be in cold seasons from this November to next May. Taking the draft tube of unit No.2 in the Three Gorges powerhouse for example, a preliminary study on postponing the filling time to next time is carried out theoretically according to existing conditions of design and construction. The study results are useful to construction of draft tubes.

关 键 词：三峡电站 尾水管 封闭块 分层分块 温度 混凝土 

分 类 号：TV731[水利工程—水利水电工程]