圩区大型排涝站的封闭式出水池设计时,一般都加设真空破坏阀或减压井,用以防止真空及气体压力的破坏。但在建造中、小型排涝站时,往往忽略了真空及气体压力造成的危害。我县过去建造封闭式出水池排涝站时,一般未考虑预留通气孔。1983年汛后检查,四座泵站均有不同程度的破坏。其中1974年建的一座安装3台套ZLB-70型轴流泵的排涝站,钢筋混凝土封闭式出水池出水,在汛期高水位情况下,开机后从出水池内向外射出水柱,水柱超过外河水位2～3米,当即关闭防洪闸,才使工程免遭严重破坏。汛后检 Drainage station of large drainage ditch closed tank design, the general increase vacuum damage valve or relief well, to prevent the vacuum and gas pressure damage. However, in the construction of small and medium-sized drainage stations, often neglect the vacuum and gas pressure caused by the harm. In the past, when the county built a closed-type outfall drainage station, it generally did not consider reserving ventilation holes. After the flood inspection in 1983, all four pumping stations had varying degrees of damage. Among them, a drainage station for installing three sets of ZLB-70 axial-flow pumps and a reinforced concrete enclosed-out water tank installed in 1974 were used to discharge water from the inside of the water outlet to water outside the water outlet When the water level is 2 to 3 meters, the flood gate will be closed immediately to prevent the project from being seriously damaged. After the flood inspection