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鉴于近年来隧道大火常引起严重的混凝土坍塌,法国中央桥梁公路工程研究所对混凝土在高温状态下的性能进行了研究攻关,并发明两种提高混凝土耐火性能的技术。 据主持此项研究的阿克尔介绍,混凝土在700℃～1000℃时便会像葱头一样一层层地瓦解成碎片。经过对1996年芒什隧道大火和今年初勃朗峰隧道大火现场进行比较勘察分析,他们发现,所有混凝土碎片的厚度都是2～3 mm。此外,他们还发现所有混凝土结构的连接处,都没有出现坍塌现象。此后,他们又在
In view of the serious concrete collapse caused by tunnel fire in recent years, the research of the Central Bridge Highway Engineering Institute of France has studied the performance of concrete under high temperature and invented two technologies to improve the fire resistance of concrete. According to Aker, who presided over the study, the concrete was disintegrated into pieces like layers of onions at temperatures between 700 ° C and 1000 ° C. After a comparative survey of the Manchurian tunnel fire in 1996 and the Mont Blanc tunnel fire scene earlier this year, they found that all concrete fragments were 2 to 3 mm thick. In addition, they also found that no collapsing occurred at the joints of all concrete structures. Since then, they are again