巴基斯坦N-J水电站阀帽门舌瓣门密封间隙问题处理

Solution to Gaps Reduced for Flap Gate of Bonneted Gate in N-J Hydroelectric Project in Pakistan

巴基斯坦N-J地下厂房水电项目,为了减少尾水闸门的岩石开挖量,首次引用了带有小舌瓣门的阀帽门设计,安装后,在无水调试过程中,发现悬臂梁结构形式舌瓣门因刚性较差,造成密封面间隙超标,远臂端的间隙超过60 mm。根据舌瓣门的结构特点和工作机理,结合项目实际工期要求,经过方案分析比较,采用了在远臂端侧采用滑轮结构增加配重的方法,及时解决了舌瓣门关闭不严的问题。

In the underground hydro power plant of N-J project, in order to decrease the rock excavation of draft tube outlet gates, it is the first time to introduce the bonneted gates with flap gate. During the procedure of dry test after installation, it is found that the seal gaps of the flap gate is out of tolerance due to the weak rigidity of cantilever construction, the gaps more than 60 mm away to the lever. As per the structure feature and working mechanism, considering the periods of project, by comparing and analyzing the proposed solution, it is decided to adopt the method of putting the counterweight far end of the lever to resolve the issue of flap gate not properly close.