Abstract
Network of the transportation system has been expanded to support urban development as an infrastructure. Underground tunnels have been constructed to make effective use of the space and to minimize environmental problems of the urban area. It is expected that the number of the underground tunnels will increase rapidly in the near future. Unfortunately, fires in tunnels caused many fatalities in the past years. The tunnel fire is dangerous because if a fire is ignited inside the tunnel it can progressively spread over a lorry or entire train, which is loaded with large amount of combustibles.
High strength pre-cast concrete segments are used to construct an underground tunnel. The segments are susceptible to spalling if they are exposed to a rapid temperature rise or extremely high temperature environment caused by a tunnel fire. Several types of fire protective systems are developed to suppress such a catastrophic failure of the segment.
Here, it is the one that a typical fireproofing protection material is constructed to the segment, and the characteristic was verified based on the experiment.
This report reproduced a tunnel fire by the RABT heating curve by using the horizontal element fire resistance test furnace of newly established BRI, and examined safety.
