黑龙江省萝北县水利技术人员在前锋防洪闸的施工过程中．由于施工围堰填筑质量较差，春汛到来时，致使围堤决口，决口宽7米，水深4米，流速很大，开始用抛石笼和土袋堵口，但均被冲走。由于水太深，流太急，在龙门口打排校也非常困难．形势十分危急。为此，该县技术人员及时采 Luobei County, Heilongjiang Province, water conservancy technical personnel in the floodgate during the construction process. As construction cofferdam filling quality is poor, the arrival of spring flood, resulting in the embankment burst, burst width of 7 meters, depth of 4 meters, a large flow rate, began to use the stone cage and soil bag plugging, but were washed away. Due to the water is too deep, the flow too fast, it is very difficult to arrange school in the Dragon Gate. The situation is very critical. To this end, the county technical staff timely mining