PROBLEM TO BE SOLVED: To provide an automatic inundation prevention gate capable of preventing inundation due to flooding of typhoons and other rivers and protecting property of houses and household goods. SOLUTION: Normally, a car can be passed from a car to a pedestrian on an iron plate laid inside the gate, and when water is flooded or flooded, the iron plate automatically lays up vertically in accordance with the water level by natural force to prevent inundation. It is a gate to prevent flooding, by fixing the pillars of the flood prevention gate 1 and the inner base of the pillar with a number of laying iron plates 2 on one side with a trillion number, and attaching the buoyancy material 3 to the lower half of the other side of the trillion number Pass one stainless wire 4 through each of the two pulleys 5 installed at high places on both sides of the gate, attach one side to the opposite side of the iron plate 2 and attach the other side of the wire to the weight 6, By combining the buoyancy material and the buoyancy material, the floor plate is automatically raised vertically above the water level during a flood to prevent water from entering. [Selection diagram] Fig. 1
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