我国现有铁路隧道4866座,总延长达2270多公里。随着交通运输业的发展,必将修建更多的铁路隧道。国内外铁路列车在隧道中着火成灾的时有发生,据不完全统计,已发生过18次,死120人,伤850多人,烧毁大量车辆和隧道设施,中断了行车。我国从1976~1990年间,铁路隧道内曾发生过3次油槽列车着火事故,直接经济损失达1000多万元,累计中断行车46天,严重地干扰了运输生产。为此,近年来开展 China’s existing railway tunnel 4866, a total extension of 2270 kilometers. With the development of the transportation industry, more railway tunnels will be constructed. According to incomplete statistics, there have been 18 accidents, 120 deaths and more than 850 injuries. A large number of vehicles and tunnel facilities have been destroyed and traffic has been interrupted. In our country, from 1976 to 1990, there were three fire accidents of tanker train in the railway tunnel. The direct economic loss reached more than 10 million yuan and the total interruption of traffic for 46 days severely interfered with the production of transportation. To this end, carried out in recent years