目录排水管线顶管施工方案.........................................................................................................................16.8.1 顶管方式选择.........................................................................................................................16.8.2 临建场地................................................................................................................................26.8.3 测量........................................................................................................................................26.8.3.1 平面测量控制..........................................................................................................................26.8.3.2 高程测量..................................................................................................................................26.8.3.3 顶管施工测量..........................................................................................................................36.8.3.4 测量要求..................................................................................................................................36.8.4 顶管工作坑尺寸设计..............................................................................................................36.8.5 工作坑结构设计及做法..........................................................................................................46.8.5.1 锚喷工作坑的施工顺序...........................................................................................................46.8.5.2 锁口圈梁..................................................................................................................................46.8.5.3 竖井开挖..................................................................................................................................56.8.5.4 竖井支护.....................................................................................................................
