向家坝大型导流底孔封堵闸门水力学试验研究  

Hydraulic experimental research on plugging sluice gate of large scale diversion bottom outlet of Xiangjiaba Hydropower Station

作　　者：刘志雄[1] 金峰[1] 陈辉[1] 

机构地区：[1]长江科学院水力学研究所,湖北武汉430010

出　　处：《人民长江》2011年第11期23-26,共4页Yangtze River

摘　　要：向家坝枢纽导流底孔属临时建筑,用后封堵。但闸门尺寸大、水头高,若采用固定卷扬机启闭,启闭设备的容量和自重均较大,建造较为困难;若采用液压张紧提升系统启闭,此项技术又从未用于水工闸门的启闭操作,且闸门在启闭过程中经历的水力条件较为复杂。为了弄清在两种不同启闭方式过程中闸门水力学条件的变化情况,通过导流底孔封堵闸门水力学模型试验,进行了两个启闭方案下底孔内流态、压力特性以及闸门启闭力的对比试验研究。结果表明,采用液压提升系统和固定卷扬机系统进行导流洞封堵的方案均可行;推荐了与不同启闭设备方案相适应的导流底孔体形。但考虑到液压张紧提升系统方案在经济性、工期和缆机资源占用等方面的优势,建议设计采用该启闭系统方案。The diversion bottom outlet of Xiangjiaba Hydropower Station is a temporary building which will be plugged after its usage.However,the sluice is of large size and high water head and its construction would be difficult if fixed hoister is adopted for the on-off because of its large volume and dead load.If the hydraulic tension device is used,the construction would also be difficult,because this technology is seldom used and the hydraulic conditions are complicated.In order to explore the variation of hydraulic conditions under the two methods,we performed the comparative experiment of flow pattern of bottom outlet,stress characteristics and on-off forces of the sluice through hydraulic experiment of plugging sluice gate.The results show that both the two schemes are feasible.The patterns of the diversion bottom outlet suitable for different on-off schemes are suggested.The hydraulic tension device is recommended for its economical efficiency,short construction period and small occupancy of cable.

关 键 词：导流底孔 封堵闸门 固定卷扬式启闭机 液压张紧提升系统 

分 类 号：TV66[水利工程—水利水电工程]