综合管廊电缆燃烧烟气温度实验研究

摘要

为研究综合管廊内电缆燃烧烟气温度特征,建立了1:3.6小尺寸综合管廊模型,进行电缆火灾燃烧实验,对温度数据进行分析.结果表明:火灾烟气温度存在纵向衰减,且距火源越近处衰减速度越快;电缆水平燃烧蔓延速度约为0.0235 m/min;与火源同一横截面、距火源0.3 m处垂直方向上烟气温度呈现出明显的跳跃现象;与水平方向夹角45°处是弧度方向上烟气温度由低温向高温的过渡位置.应加强综合管廊内上部结构的抗火性能以及与水平方向夹角45°及以上区域的防火设计.%In order to study the temperature characteristics of cable fire smoke in utility tunnel, established a small size model of 1:3.6, and carried out the electric cable fire experiment, to analyze the temperature. Experimental results showed that:there is a longi? tudinal attenuation in the process of smoke, and the closer to the fire, the faster the attenuation is; the horizontal burning rate of electric cable is about 0.0235 m/min;the smoke temperature in the vertical direction, which is in the same horizontal plane as the fire source and 0.3 m apart from the fire source, presents an obvious jump phenomenon; when the angle of the horizontal direction is 45° , the smoke temperature in the arc direction is transition from low temperature to high temperature. Therefore, the fire resis?tance of the upper structure and the area with the angle bigger than 45° in utility tunnel should be strengthened.