EXPERIMENTAL STUDY ON EARLY DETECTION OF TUNNEL FIRE

Abstract

 When a fire breaks out in a road tunnel, it is important to secure a safe evacuation environment, and for that purpose, reliable early fire detection is required. In order to enable the detection of smoke in the early stage of the fire before ignition, smoke sensors, laser gas sensors, and photodiode sensors with different detection methods were selected, and the qualitative correlation between smoke concentration and each sensor output was confirmed in preliminary experiments. However, the detection characteristics of each sensor were investigated by a smoke cylinder and pan fire experiment in a full-scale tunnel. As a result, it was found that within the scope of this experiment, each sensor has the possibility of early detection of fire at the smoldering stage before ignition. In particular, the photodiode sensor suggests the possibility of early fire detection regardless of the smoke color, because the smoke enters the bird's-eye view even before the smoke reaches the sensor installation location.