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  Flood measure of the Underground station of Tokyo Metro

  Tokyo Metro Co., Ltd. (hereinafter, Tokyo Metro) comprises 9 routes in capital area of Japan operating over 195.1 km and 179 stations, and is used by 7.24 million passengers per day. Tokyo Metro operates on the belief that security equals safety plus service. In regard to safety, special effort is devoted toward countermeasures for natural disasters. In light of recent extreme weather events, countermeasures for heavy rains are particularly important. Report in the Central Disaster Prevention Council in 2009 that metropolitan area’s 17 lines and 97 stations and 147km of the tunnels will be completely submerged. And so Tokyo Metro determined safety of human life is the most important matter. Tokyo Metro will respond urban flood disaster assumed by Central Disaster Prevention Council or each municipality and Large-scale Flood Disaster once a 1000 year probability with the aim of damage reduce from submerged and early recovery. We are developing and installing various watertight facilities at all pithead, ventilator openings, underground station entrances and other openings. Also a substation and signaling machine room with is built at ground level is measures against flooding for early recovery at ground level. Among these, underground station entrances are expected to suffer the most damage. Most Tokyo Metro station entrances are situated on sidewalks, there are many obvious spatial restrictions. In light of these restrictions, conventional watertight doors (hinged doors that apply positive pressure against floodwater pressure) cannot be used to improve all entrances, thus we have continued to develop counterpressure doors, hinged double doors, shutters, bi-fold doors and other types of watertight doors that fit to the environments of individual entrances. In addition, many buildings, which Tokyo Metro tunnels connect underground, are not prepared for the disasters flood damage, meaning that Tokyo Metro must take action on its own property to prevent flood water inundation from such buildings. Thus, we have developed counterpressure sliding doors capable of withstanding water pressure from flooding up to 15 m depth. In this article, Tokyo Metro’s improvement policy and descriptions of various types of underground watertight doors and the performance required of them.

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