支架整体稳定性不足，方案缺少稳定措施；
4、2005年12月14日贵州小尖山大桥现浇梁支架垮塌见（图5-2-4）
图5-2-4高宽比例严重失调支架倒塌事故照片
教训点：这是一起典型的高宽比例严重失调支架倒塌事故。支架横向纤细、刚度不足，横向没有约束措施，横向稳定性不满足立柱承载力要求，支架屈溃侧弯失稳倒塌。
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┊目录1绪论................................................................................................................................. 1研究背景................................................................................................................ 1我国高速铁路发展历史............................................................................. 1我国高速铁路施工事故............................................................................. 2评价减少事故的发生................................................................................. 4国内外研究现状.................................................................................................... 5国外研究现状............................................................................................. 5国内研究现状............................................................................................. 6研究内容、目的及意义........................................................................................ 7 2安全评价理论及方法............................................................................................... 10安全评价理论...................................................................................................... 11安全理论的发展及现状........................................................................... 11安全评价原理........................................................................................... 11常用安全评价方法.............................................................................................. 12安全评价的目的.................................................................................................. 13安全评价的意义.................................................................................................. 14 3高铁施工过程危险因素的辨识............................................................................ 16危险源的基本概述.............................................................................................. 16危险源的定义........................................................................................... 16施工过程危险源的分类........................................................................... 17高铁施工危险源的特征........................................................................... 19高铁施工过程中危险源的辨识.......................................................................... 19高铁施工过程中危险辨识的依据........................................................... 19
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┊ABSTRACT This paper according to the relevant laws and regulations and hazards identification procedures, and combined with common high-speed rail construction accident case, intuitive experience analysis and system safety analysis method, from the perspective of energy source energy carrier, recognition and sums up the main hazards in the process of high-speed railway , according to the obtained from the identification of hazards, established an evaluation index system. Then, the weight of index system to make use of analytic hierarchy process is calculated. To calculate weight at all levels of system target element synthesis, and sorting. The results showed that the various influence factors of high-speed railway construction safety situation, its importance is not equal, some decide to situation of construction safety, others are less , the conclusion and methods applied to the actual case, and on the basis of fuzzy mathematics, with the aid of the theories of fuzzy mathematics, to practice some of the problems is blurry, and difficult to quantify, the quantification, and using the fuzzy comprehensive evaluation method of high-speed rail construction has carried on the quantitative evaluation of hazard. Keywords: High speed railway construction; Risk identification; The evaluation index system; Analytic hierarchy process; Fuzzy comprehensive evaluation method
高铁工程事故案例分析
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篇一：第二节、支架倒塌案例分析
第2节、支架倒塌图片案例分析
1、哈大铁路客运专线沈阳枢纽跨北皇线特大桥T构坠落事故，也是一起墩梁临时固结体外支撑柱倒塌事故，见图5-2-1所示。