The behavior of smoke and flame when a fire breaks out in a large-scale tunnel that have been revealed by a report on fire experiments inside the Shimizu No.3 Tunnel on the New-Tomei Expressway that is now under construction, and by the results of other experiments march in 2001.
The experiments were carried out for the following reason. Tunnels on the New-Tomei Expressway with three lanes plus shoulder are large-scale tunnels with an inside section area of 115 m
2. Because this inside section area is about twice that of a two-lane tunnel, it is very important to inspect the smoke behavior and heat diffusion in such large-scale tunnels that differ from those in two-lane tunnels.
Therefore, experiments were carried out in an actual tunnel to clarify the characteristics of fires in large-scale tunnels in order to enact tunnel emergency facility standards for large-scale tunnels.
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