| 摘要 |
PROBLEM TO BE SOLVED: To provide a door device that normally maintains an open state and performs a closing operation immediately in a case of a flood so as to prevent water from entering.SOLUTION: At a doorway part, a door body 14 which normally receives force in a closing direction is provided to be opened and closed. For the door body 14, an open state holding mechanism 15 is provided which holds the door body 14 in a doorway-open state. Further, a water absorption member 21 which absorbs water to vary in volume is provided nearby the open state holding mechanism 15, which is configured to quit holding the door body in response to variation in volume of the water absorption member 21. |
