Abstract: The erosion area at the entrance section of emergency gate slot at No.2 opening of the sluiceway is 60 m deep underwater. In order to repair the damaged area, a floating gate is required to be manufactured as a bulkhead gate which can be placed at No.2 opening to create the construction condition in the dry site. A lot of work has been done around the floating gate and a range of new technology are developed and created, including the under-water measurement technology of concrete seal plane, selection of seal type, test and fabrication, technology of floating gate lowered and raised and being placed under water accurately. Knotty problems have been solved one by one and the desirable result has been achieved. It creates a miracle of which floating gate in deep water blocks up successfully once in China.

摘要： 泄水道检修门槽进口段磨蚀破坏部位在60多m水下，要修复处理，就要制造一扇浮体闸门，将其封堵在2#孔进水口，创造旱地施工条件；围绕浮体门的堵水工作，探索、研究、实践、创新和发明了一系列新技术：混凝土止水面水下测量技术，水封选型、试验、制造技术，浮体门沉浮技术以及浮体门下水就位技术；解决了一个又一个难题，封堵结果相当成功，创造了国内大坝深水浮体闸门封堵一次成功的奇迹。?