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当工作闸门设置在管口前,并且属于淹没闸时,必须在闸门后设置通气孔,以防止产生气蚀和震动。通气孔在隧洞和涵管的进口建筑中,虽为一小结构,但在闸门的运行中是必不可少的。如江西瑞昌县横港水库放水涵管,原为斜拉式平板闸门,主涵管直径0.9米,通气孔只设了0.1米直径园管,开闸时震动很大,须将闸门开启到70%以上震动才停止。该工程现已改建成框架启闭台,通气孔设0.3米直径的园管,运行两年,再没有发生震动。现将瑞昌县已建成隧洞与涵管的通气孔尺寸及运行情况列表如下(见表1)。
When the working gate is set in front of the spout and belongs to the submerged gate, vents must be provided behind the gate to prevent cavitation and vibration. Ventilation holes in the tunnel and culvert import building, although a small structure, but in the operation of the gate is essential. Such as Jiangxi Ruichang Henggang Reservoir Drainage Culvert, the original oblique-pull flat-panel gate, the main culvert diameter of 0.9 meters, the vent is only set 0.1 meters diameter garden tube when the gate shock, the gate to be open to 70% The above vibration stopped. The project has been rebuilt into a frame opening and closing units, ventilation holes set 0.3 m diameter garden tube, running for two years, and then no vibration. Ruichang County now has built tunnels and culverts vent size and operating conditions are as follows (see Table 1).