摘要
为保证多舱体系变电站的钢结构预制舱单元在主变压器火灾下的安全性,提出了一种以蒸压轻质混凝土板作为围护材料的附加防火层构造;该构造基于建筑工业化的发展背景,不仅可在工厂预制,现场施工亦简单快捷。基于碳氢化合物火灾升温曲线,对既有多舱体系变电站所采用的复合墙体及所提出的附加防火层构造进行了时长为3 h的受火试验;其中,5个附加防火层试件的设计考虑了重复受火、钩头螺栓锚固长度、板厚、干密度等级、板材连接方式等参数的影响。结果表明,由于热桥效应,复合墙体试件中的构造钢柱所对应的背火面测点温升在107 min后达180℃,无法满足该场景下的隔热性要求;采用所提出附加防火层构造的试件在受火3 h后均可满足隔热性和完整性要求,其中齐口连接形式的最不利试件背火面测点最高温升为143.8℃。另外,齐口连接方式较错口连接方式在隔热性及施工便利性方面均具有优势;较短的钩头螺栓锚固长度有助于降低热桥效应;更高的干密度等级有利于提升耐火性;100 mm厚的ALC板已经具有足够的安全冗余。
To ensure the safety of steel structure prefabricated cabin units in multi-compartment substations under transformer fires,a construction method utilizing autoclaved lightweight concrete slabs as additional fireproof layers for enclosure materials was proposed.This construction method,designed in the context of advancing industrialization in the building sector,allows for both prefabrication in factories and simple and rapid on-site assembly.Based on the hydrocarbon fire temperature-time curve,fire tests lasting 3 h were conducted on the composite wall panels used in existing multi-compartment substations and the proposed additional fireproof layer construction.The design of the five additional fireproof layer specimens took into account various parameters such as repeated fire exposure,hook bolt anchorage length,plate thickness,dry density grade,and panel joining method.Results indicated that due to the thermal bridge effect,the temperature rise at the back-fire surface measurement points of the composite wall panel specimens reached 180℃after 107 min,failing to meet the insulation requirements for the scenario.In contrast,the specimens with the proposed additional fireproof layer met both insulation and integrity requirements after 3 h of fire exposure,with the least favorable specimen's back-fire surface temperature rise peaking at 143.8℃.Additionally,the flush connection method demonstrates advantages over the staggered connection method in terms of insulation performance and construction convenience;shorter anchor length of hook bolts reduces the thermal bridge effect;higher dry density grade is beneficial for improving the fire resistance;the 100 mm thick ALC board already provides sufficient safety redundancy.
作者
陈锡祥
刘志祥
穆弘
范亚斌
靳幸福
张金锋
刘超
王勇
陈琛
朱劭骏
CHEN Xixiang;LIU Zhixiang;MU Hong;FAN Yabin;JIN Xingfu;ZHANG Jinfeng;LIU Chao;WANG Yong;CHEN Chen;ZHU Shaojun(State Grid Anhui Electric Power Co.,Ltd.,Hefei 230022,China;State Grid Anhui Electric Power Co.,Ltd.Economic and Technological Research Institute,Hefei 230022,China;State Grid Economic and Technological Research Institute Co.,Ltd.,Beijing 102209,China;College of Civil Engineering,Nanjing Tech University,Nanjing 211816,China;College of Civil Engineering,Tongji University,Shanghai 200092,China)
出处
《建筑钢结构进展》
CSCD
北大核心
2024年第12期118-125,138,共9页
Progress in Steel Building Structures
基金
国家电网有限公司总部管理科技项目(5200-202320127A-1-1-ZN)。
关键词
多舱体系
钢结构变电站
变压器火灾
蒸压轻质混凝土板
耐火性能
multi-compartment system
steel structure substation
transformer fire
autoclaved lightweight concrete board
fire resistance
