目录一、工程概况..................................................................................................................................1二、桥位水文、地质情况..............................................................................................................1三、施工方案综述..........................................................................................................................2四、施工便道（栈桥）施工...........................................................................................................3五、40#、41#墩桩基施工..............................................................................................................4⑴、40#、41#墩施工平台的筑岛施工...................................................................................4⑵、40#、41#墩桩基施工.......................................................................................................5六、40#墩沉井围堰施工................................................................................................................6⑴、沉井围堰施工工艺流程...................................................................................................6⑵、施工坑开挖......................................................................................................................7⑶、沉井制作..........................................................................................................................7⑷、沉井下沉..........................................................................................................................9⑸、沉井清基、堵水：.........................................................................................................12七、41#墩沉井围堰施工..............................................................................................................13⑴、施工工艺流程..............................................................................................................13⑵、双壁钢沉井制造............................................................................................................14⑶、双壁钢沉井下沉...........................................................................................................15⑷、沉井清基........................................................................................................................17八、承台大体积混凝土施工.........................................................................................................17⑴、合理选择原材料，优化混凝土配合比。.....................................................................17⑵、控制混凝土骨料温度.....................................................................................................18⑶、合理选择混凝土的浇筑时间.........................................................................................18⑷、制定合理的混凝土浇筑工艺施工方法.........................................................................18⑸、模板的外部降温............................................................................................................19⑹、浇筑完毕后的降温.........................................................................................................19九、沉井围堰的拆除.....................................................................................................
