露顶式平板闸门的止水结构,一般都是固定的。闸门在启闭过程中,(?)止水P型橡皮与门槽边壁的摩擦力很大,不但使闸门启闭容量增加,且水封磨损严重,使用寿命大大减少。根据我们1980年对人民渠百多扇大小闸门使用情况进行的调查,发现闸门止水不 The water-stop structure of the exposed flat-panel gate is generally fixed. During the opening and closing process of the gate, the friction between the (?) Sealing P-type rubber and the sidewall of the gate slot is very large, which not only increases the gate opening and closing capacity but also seriously damages the water seal and greatly reduces the service life. According to our survey conducted on the use of floodgate gates of over one hundred people in 1980, we found that the water stoppage in the gates did not stop