【正文】 ...................................................................................... 28 （四）保障 測量精度的措施 ............................................................................................................................ 29 第六章 隧道施工方案 ............................................................................................................ 31 一、施工順序 ..................................................................................................................................................... 31 二、隧道開挖 ..................................................................................................................................................... 31 （二）土方開挖 ................................................................................................................................................. 33 3 （三）土方外運 ................................................................................................................................................. 35 （四）進出車輛沖洗 ......................................................................................................................................... 35 三、初期支護 ..................................................................................................................................................... 36 （一）支立網構鋼架，焊縱向連接筋，掛鋼筋網片 ................................................................................... 36 （二）噴射拱、墻部、底部砼： .................................................................................................................... 36 （三）背后回填注漿 ......................................................................................................................................... 38 四、防水層施工 ................................................................................................................................................. 38 五、二次襯砌施工 ............................................................................................................................................... 39 （一）接口防水處理 ......................................................................................................................................... 39 （二）施工縫防水 ............................................................................................................................................. 40 （三）混凝土結構自防水 ................................................................................................................................. 41 （四）二襯鋼筋施工 ......................................................................................................................................... 44 （五）二襯鋼筋支撐與凈空控制 .................................................................................................................... 46 （六）模板施工 ................................................................................................................................................. 47 （七）混凝土施工 ............................................................................................................................................. 50 六、通風方案 ..................................................................................................................................................... 52 七、 施工技術措施 ............................................................................................................................................. 53 （一）穿越路口施工技術措施 ........................................................................................................................ 53 （二） 超前小導管注漿加固 ............................................................................................................................ 53 （三）路口交通設施設置 ................................................................................................................................. 55 （四）污雨水管道保護 ..................................................................................................................................... 55 第七章 施工監(jiān)測及施工信息化 ........................................................................................ 56 一、施工監(jiān)測目的 ............................................................................................................................................. 56 4 二、施工監(jiān)測設計 ............................................................................................................................................. 56 三、監(jiān)測實施及數據處理 ................................................................................................................................. 58 （一）監(jiān)測實施 ................................................................................................................................................. 58 （二）監(jiān)測警戒值的確定原則 ........................................................................................................................ 58 （三）監(jiān)測方法 ................................................................................................................................................. 59 （四 ）洞周收斂 ................................................................................................................................................. 62 （五）地下管線變形監(jiān)測 ................................................................................................................................. 63 （六）數據處理及信息反饋程序 .................................................................................................................... 63 四、監(jiān)測管理及質量保證措施 ........................................................................................................................ 64 第八章 安全應急預案 .......................................................................................................... 65 一、應急小組成員以及職責 ............................................................................................................................ 65 二、最大風險及危險源的確定 .............................................................