武汉轨道交通七号线出入口顶管掘进施工技术

Construction Technology of the Pipe Jacking in Wuhan Rail Transit

武汉市轨道交通七号线Ⅲ号出入口及Ⅳ号出入口采用顶管法施工。该工程顶管掘进机开挖断面尺寸为9820mm×5520mm,为大断面矩形顶管,控制地面及管线沉降、控制顶管机姿态、防止顶管机整体后退是该工程重难点之一。根据工程经验和现场条件,选择合适顶管机性能参数,确定顶管掘进方案,控制顶进速度,严格控制出土量,防止超挖或欠挖,控制顶进轴线、地面沉降、管节注浆、渣土改良、管节防水等环节,工程顺利实施,取得良好效果。

The top pipe approachconstruction was applied on the Ⅲ and Ⅳimport and export of Wuhan City Rail transitline 7 The size of the excavation section of the pipe jacking machine is 9820mm×5520mm,which is a large pipe with large cross section How tocontrols the settlement of the ground and pipeline,adjusts the attitude of the pipe jacking machine,andprevent the retreat of the pipe jacker are the difficult problems for construction safety In this paper,the appropriate pipe jacking performance parametersselected according to engineering experience and site conditions In order to guarantee the safety of project construction,the jacking tunneling programshould be determined,meanwile the jacking speed,the amount of unearthed to prevent over-digging or digging,jacking axis,ground subsidence,pipe section grouting,slag improvement,pipe section waterproofing,should bestrictlycontrolled