Abstract In order to ensure the overlapping accuracy of the section CPⅡnetwork in the tunnel before breakthrough of the long and large tunnel, and improve the construction efficiency of the ballastless track, by taking the Anding tunnel on the Yuxi-Mohan railway as an example, the section survey technique of the CPⅡ control network in the tunnel before breakthrough of the long and large tunnel under complex conditions was studied, and a CPⅡnetwork survey 0method in the tunnel by using a crossing traverse network plus the free stationing was proposed. By strengthening the network shape strength and the accuracy of CPⅠ control network outside the tunnel and CPⅡ control network inside the tunnel, optimizing the distribution of CPⅡ points inside the tunnel and the adjustment calculation scheme, the compatibility of the construction traverse points under joint survey was analyzed, and a complete set of section survey technique of CPⅡ network inside the tunnel before breakthrough of the long and large tunnel was presented. The results show that the section survey method can not only ensure the accuracy of the CPⅡcontrol network in the tunnel, but also ensure the overlapping accuracy between the CPⅡ control networks surveyed section in the tunnel, it can also ensure the smooth overlapping of each section of ballastless track after the breakthrough of the tunnel.
Abstract：
In order to ensure the overlapping accuracy of the section CPⅡnetwork in the tunnel before breakthrough of the long and large tunnel, and improve the construction efficiency of the ballastless track, by taking the Anding tunnel on the Yuxi-Mohan railway as an example, the section survey technique of the CPⅡ control network in the tunnel before breakthrough of the long and large tunnel under complex conditions was studied, and a CPⅡnetwork survey 0method in the tunnel by using a crossing traverse network plus the free stationing was proposed. By strengthening the network shape strength and the accuracy of CPⅠ control network outside the tunnel and CPⅡ control network inside the tunnel, optimizing the distribution of CPⅡ points inside the tunnel and the adjustment calculation scheme, the compatibility of the construction traverse points under joint survey was analyzed, and a complete set of section survey technique of CPⅡ network inside the tunnel before breakthrough of the long and large tunnel was presented. The results show that the section survey method can not only ensure the accuracy of the CPⅡcontrol network in the tunnel, but also ensure the overlapping accuracy between the CPⅡ control networks surveyed section in the tunnel, it can also ensure the smooth overlapping of each section of ballastless track after the breakthrough of the tunnel.
ZHANG Yanping
.Study and Application of Section Survey Technique of CPⅡ Network in Long and Large Tunnel[J] MODERN TUNNELLING TECHNOLOGY, 2022,V59(6): 224-231
2022, Vol. 59 