Discussion on the construction craft of tunnel in passenger dedicated highway line underpasses through established railway pipe roof

Considering of the importance of the construction of controlling of surface subsidence and controlling of the accuracy of long-tube screen construction,it analysis in depth on this issue taking the case of the long-tube screen construction of the project that passenger dedicated highway line from Beijing to Shijiazhuang underpasses Shi-Tai direct line,during which accuracy control mainly depends on the more advanced guidance equipment,sedimentation control on comprehensive measures of excavation rate,pipe grouting in and outside pipe and simultaneous monitoring of on-site construction.