电缆廊道中电缆接头处的火灾危险性分析  

Analysis on fire hazard of cable connection in cable gallery

作　　者：雷蕾[1] 张辉[1] 张烨 LEI Lei;ZHANG Hui;ZHANG Ye(The Chinese People's Armed Police Forces Academy,Hebei Langfang 065000,China;Yichang Fire Detachment,Hubei Yichang 443000,China)

机构地区：[1]中国人民武装警察部队学院,河北廊坊065000 [2]宜昌市消防支队,湖北宜昌443000

出　　处：《消防科学与技术》2018年第9期1290-1294,共5页Fire Science and Technology

基　　金：公安部技术研究计划项目"狭长受限空间内火灾温度分布规律研究"(2015JSYJC24);北京市科技计划项目"综合管廊安全技术研究及北京城市副中心应用示范"(Z171100000517007);武警学院国家基金培育课题"城市综合管廊中电缆廊道火灾发展规律及预防关键技术研究"(ZKJJPY201624);中国建筑科学研究院自筹基金资助项目"综合管廊消防安全关键技术研究及应用"(20160111330730033);河北省重点研发计划项目"雄安新区地下综合管廊规划设计;绿色建造及安全运维关键技术研究"(18275410D)

摘　　要：分析电缆廊道的火灾原因。针对电缆连接处探讨火灾危险性,选用ANSYS软件对电缆廊道中电缆连接处进行建模与数值模拟分析,根据正常运行状态、过载运行、绝缘老化生热、以及外部受火的特点,对模型施加不同载荷,生成不同时刻的时间-温度曲线并分析模拟结果。研究表明,电缆过载1 h后其护套与绝缘层温度均突破允许值,电缆性能开始弱化,但仅从温度上比较,电缆连接处与本体相比并没有出现劣势;绝缘老化时,电缆连接处的材料在瞬间达到燃点,生热1 min后连接处绝缘层全面受到高温影响;外部受火30 s时,温度梯度反向,15 min后整条电缆极有可能大面积破损失效;电缆材料中绝缘层比护套具有更大的火灾危险性。The fire causes of the cable gallery were analyzed.Against the fire hazard for the cable connection,and according to the characteristics of normal operation,overload operation,insulation aging damage,and suffering external fire,different load was applied on the model,generating the time-temperature curves and the results were analyzed.The study showed that after overloaded for 1 h,the temperature of jacket and insulation breaks through the allowable value,the cable performance begins to be weaken,but it is not inferior for the cable connection to the main body in the temperature dimension;the cable connection material reaches the ignition temperature at the moment it begins to be insulation aging damaging,and the insulation layer at the connection was fully affected by high temperature just 1 min later;after suffering the external fire for 30 s,the temperature gradient reverses,and 15 min later the entire cable is likely to be damaged and has a large scale of failure area;the insulation has a greater fire hazard than the jacket.

关 键 词：电缆 数值模拟 温度分布 火灾危险性 火灾调查 

分 类 号：X928.7[环境科学与工程—安全科学] TM24[一般工业技术—材料科学与工程]