船闸反向弧形阀门顶止水装置改造

船闸反向弧形门日常故障主要是顶止水损坏，主要是反向弧形门开启之初顶止水与门楣脱离形成窄缝，止水受力恶劣，易造成止水损坏。从提高止水固定可靠性和改善受力两方面对顶止水装置进行改造研究。通过分析止水现有固定方式存在的问题，采用穿孔螺栓并安装两个螺母防松的方式进行固定，提高可靠性，并在试验装置上对止水压板增加挡水板后止水的受力情况进行测试。结果表明，止水空化减弱，水动力时均压力荷载减小，并能抑制顶止水的自激振动，止水受力状况得到改善。在2022年葛洲坝3^#船闸大修中对反向弧形门顶止水装置进行改造，运行效果良好。

Reconstruction of top water seal device of reversed tainter valve of ship lock

The daily failure of the ship lock reversed tainter valve is the damage of the top water seal. Especially when the reversed tainter valve is opened, the top water seal and the gate lintel are separated to form a narrow gap. The stress on the water seal is terrible, causing the water seal to be easily damaged. The modification of the top water seal device from improving the fixation reliability of the water seal and the force are studied. The issues in the existing fixation methods of the water seal are analyzed. Perforated bolts and two nuts are used to fix and prevent loosening to improve reliability. Water retaining plates are added to the water seal on the test device, then the force state of the water seal is tested. The results show that the cavitation of the water seal is weakened. The hydrodynamic time-averaged pressure load is reduced. The self-excited vibration of the top water seal can be suppressed, and the force state of the water seal is improved. In the overhaul of Gezhouba No. 3 ship lock in 2022, the top water seal device of the reversed tainter valve is modified, and the operation effect is good after the modification.