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港铁(00066.HK)指去年红磡出轨事故因更换合成轨枕刚度不同导致
阿思达克 03-03 15:56
港铁(00066.HK)公布去年9月17日红磡站东铁线出轨事故之调查结果,发现事故是由於红磡站附近一个道岔的动态轨距扩阔所致。公司就事故组成一个委员会,并邀请英国、澳洲及香港的外间专家提供意见,发现东铁线轨道维修人员在8月4日凌晨,因为要修正轨距情况,将两条损耗的木材轨枕更换成合成轨枕。由於该位置的轨道走线是一个急弯,以及行车非常繁忙,加上新换的两条合成轨枕与邻近的轨枕的刚度不同,结合而产生了特别效应,在未有预见的情况下,列车在驶经该急弯时产生的横向力大部分集中在新换的两条合成轨枕上的轨道支撑组件,加速了组件的损耗,令三颗固定轨枕的螺丝钉断裂,其中一边的钢轨因而侧移,最终令两条路轨之间的距离增加,即动态轨距扩阔至超出关键水平,列车车轮撞到护轮轨後,列车出轨。委员会总结,列车及信号系统当时运作正常及不是导致出轨的原因,亦没有发现任何外来障碍物。在事故现场发现的断裂纲轨是列车出轨後所造成的损毁。
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