| 摘要 |
PROBLEM TO BE SOLVED: To provide a compact, high-performance automatic waterproof wall system that prevents inundation to the inside by constantly positioning the tip of a waterproof wall at a higher position than water level by a duct tube and the waterproof wall for floating to prevent a building, an underground shopping area, a basement, and an underground passage from being damaged when water floods a town, and returns to its original position due to dead weight when the water level goes down. SOLUTION: The waterproof wall that floats in water by opening a hole in advance near the entrance of an underground and an building is placed individually or along with a duct tube. When water enters, the waterproof wall goes up for keeping the position above the water level to prevent water from entering. Or, when the water level goes down, the waterproof wall returns to its original state due to dead weight in the automatic waterproof wall system.
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