| 摘要 |
PURPOSE:To prevent damage of a gate, by a method wherein a gate lip is disposed to the lower edge line of the rear surface on the downsteam side, a watertight rubber is located to the front on the upper stream side, and a roller, rolling along a door groove, is displaced toward the downstream side to prevent vibration of the gate. CONSTITUTION:Where, with an orifice roller gate 1 raised, a given opening is provided at the opening on the downstream side of an orifice 4, water in the orifice 4 flows along the front of the gate 1 and through a space between 3 gate bottom plate and the orifice bottom to flow out. In which case, a gate lip 7 is located at the edge on the downsteam side of the gate 1, and thereby wave motion is produced on the downstream side of the gate lip 7, and a fluctuation in a pressure occurring along with the wave motion is prevented from being exerted on the gate bottom, resulting in the possibility to prevent vibration of the gate 1. |
