传统的小型水库或塘坝的输水洞多为直升式闸门,这种闸门需要较高的操作台、工作桥及相应的启闭设备,有时此项占整个输水洞造价的三分之一,由于输水洞闸门为上下直升启闭,橡胶止水材料沿闸槽滑动磨擦损失很大,启闭数次后止水橡胶残缺不全,因此多数直升式闸漏水严重,小型水库及塘 Most of the traditional small reservoirs or pond dams are straight-lift gates. Such gates require high operating platforms, working bridges and corresponding opening and closing devices. Sometimes this takes up one third of the total cost of waterways Since the gate of the water supply tunnel is opened and closed by helicopter up and down, the rubber water-stop material has a great loss of sliding friction along the gate. After several times of opening and closing, the rubber of the stop-water rubber is incomplete. Therefore, most of the helicopters have serious water leakage and small reservoirs and ponds