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对某厂的LD管线进行全面检验时,发现该管线有严重的扭曲变形现象.在压力管道的全面检验中,这类现象非常罕见.经过现场宏观检验、材质光谱分析、超声波壁厚测定、焊缝渗透无损探伤、直管壁厚校核等检验项目后,确定为:管线在设计时未根据工艺状况设置补偿器,导致运行时由于较大温度变化产生非常大的热应力,造成管线扭曲变形及支架位移,形成应力集中.文中的案例分析给管道检验提供参考,确保化工生产安全运行. 相似文献
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结合翔安隧道工程实践,对高风险海底隧道施工中如何应用超前地质预报技术,如何设计减震爆破技术,如何处理软弱富水围岩,如何预防及应对突泥、涌水等突发事件等进行了系统的研究和应用,总结出一套适用于复杂地质条件下,大断面、高难度、高风险隧道施工的安全掘进方法,为工程安全施工提供技术保障。 相似文献
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王子胜 《广东交通职业技术学院学报》2005,4(3):41-43
文中结合广东省省道113线新兴段公路建设工程的实际情况,就钻孔灌注桩技术在建设中的实际应用和推广进行了深入的总结,详细阐述了该技术在实际施工中的具体施工方法、施工流程、施工工艺、技术原理和质量控制措施。 相似文献
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An effective evacuation of buildings is critical to minimize casualties due to natural or anthropogenic hazards. Building evacuation models help in preparing for future events and shed light on possible shortcomings of current evacuation designs. However, such models are seldom compared or validated with real evacuations, which is a critical step in assessing their predictive capacities. This research focuses on the evacuation of a K-12 (kindergarten to 12th grade) school located within the tsunami inundation zone of Iquique, Chile. An agent-based evacuation model was developed to simulate the evacuation of approximately 1500 children and staff from the school during a global evacuation drill carried out for the entire city. The model simulates the motions of heterogeneous human agents, and the simulations were validated using video analysis of the real event. Resulting error estimations between predicted versus measured flow rates and evacuation times are 13.5% and 5.9%, respectively. The good agreement between the simulated and measured values can be attributed to the known distribution of students and staff at the start of the drill, and their known exposure to emergency preparedness protocols. However, the results presented herein show that this mathematical evacuation model can be used for logistical changes in the emergency planning. 相似文献
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跨越京哈、津山及东联线3条铁路的公路立交桥,主桥为2×96 m孔跨的大跨度,转体重13 600 t,采用箱梁预制独塔斜拉后平转施工技术,解决了桥梁快速跨越铁路施工的安全、干扰问题;同时大吨位、大体积、大跨度箱梁转体,采用ZLD300电脑中控全自动千斤顶系统,利用安装在上转盘内部的钢绞线牵拉作为牵引及动力,系统解决了大吨位、大跨度箱梁在平转过程中的的连续、平稳、安全等一系列问题。 相似文献
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结合在京沪高速铁路天津特大桥钻孔桩的施工经验,阐述了旋挖钻的钻孔原理、钻孔施工工艺、成孔检测和常见的钻孔异常情况的处理,提出旋挖钻机施工的质量控制措施,以期提高旋挖钻机施工质量。 相似文献
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笔者针对苏通大桥水深流急的工况,总结了该桥施工时放弃传统钢管桩支承平台方案,直接利用钢护筒作为承力构件,通过使用悬臂式定位导向架进行平台施工的这一特点,为保证该桥质量,缩短工期提供了重要条件. 相似文献