目次1工程概况..........................................................32主要编制依据......................................................43危险源辨识与监控..................................................43.1可能出现的事故类型...........................................43.2引发事故的主要原因...........................................43.3危险源的监控项目.............................................54支护设计..........................................................54.1设计相关规定.................................................54.2检算.........................................................64.3构造要求....................................................225施工要求.........................................................225.1施工准备....................................................225.2施工测量....................................................235.3一般要求....................................................235.4钢板桩的检验、吊装、堆放....................................245.5导架安装....................................................245.6钢板桩的施打................................................255.7变形观测....................................................275.8围堰基坑开挖与支撑..........................................275.9清淤........................................................285.10混凝土封底.................................................285.11防渗与堵漏.................................................295.12钢板桩的拔除...............................................295.13钢板桩土孔处理.............................................305.14其他注意事项...............................................305.15钢板桩的施工中遇到的问题及处理.............................315.16施工机械人员配备...........................................316工程质量检查与验收...............................................327施工安全管理.....................................................327.1组织措施....................................................327.2质量技术措施................................................337.3安全技术措施................................................347.4施工机械施工安全............................................367.5临近既有线施工安全..........................................367.6施工现场要求................................................378应急预案.........................................................388.1事故报告程序................................................388.2事故报告....................................................388.3现场事故应急处置............................................388.4人员伤亡应急处理............................................398.5应急培训和演练..............................................398.6应急通信联络................................................391基坑开挖及支护工程安全专项施工方案1工程概况沈大线K189+403驼台堡大桥改造工程，正线改造延长1.9公里,在对应既有沈大线下行线12.0米处新建一座7-20.0m双线预应力钢筋混凝土简支T梁桥，全长158.8m，桥上线间距为4.2m，钻孔桩基础，矩形承台，圆端型桥墩，T型桥台。既有桥梁加固及拆除、新建桥梁工程及引起的线路、通信、信号、电力及接触网排迁等工程。因承台基坑开挖深度在5米，开挖支护方式采用钢板桩围堰。1.1桥址处地层从上至下为：(1)砌石护底：层厚0～0.8m；石块为主，大小不均，填充混沙砾，少量粘性土底标高97.82。(2)杂填土：厚度0.8-1.2m；褐色，稍湿，松散，一粗砂为主，含少量碎石及生活垃圾，充填少...
