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三、防冻 閘坝工程除了防凌和防冰压以外,还有防冻問題。淮河下游有座水閘的閘門支臂,因冻結在关閉閘門时損坏。华北地区有一水閘也因閘門与門槽冻結,在开启时,使若干孔启閉机軸瓦断裂。从已經发生的問題来看,閘門冻結主要有:(1)閘門与閘前冰盖的冻結;(2)閘門两側边緣与門槽的冻結;(3)門軸冻結。
Third, anti-freezing dam project In addition to anti-Ling and anti-ice pressure, there are antifreeze. Huaihe sluice sluice gates in the lower reaches of the Huaihe River are damaged when they are closed due to freezing. North China also has a gate due to sluice gate and door freezing, when opened, so that a number of hole hoist bearing broken. From the point of view of the problems that have occurred, the freezing of the gate mainly includes: (1) the freezing of the gate and the ice sheet before the gate; (2) the freezing of the edge and the gate slot on both sides of the gate; and (3) the freezing of the gate shaft.