长大隧道洞内CPⅡ网分段测设技术研究与应用

Study and Application of Section Survey Technique of CPⅡ Network in Long and Large Tunnel

为确保长大隧道贯通前洞内CPⅡ分多段建网的搭接精度,提高无砟轨道的施工效率,以玉磨铁路安定隧道为例,研究了复杂条件下长大隧道贯通前洞内CPⅡ控制网分多段测设技术,提出了一种交叉导线网加测自由测站的洞内CPⅡ测量方法,通过增强洞外CPI和洞内CPⅡ控制网的网型强度及其精度、优化洞内CPⅡ布点和平差计算方案、将联测的施工导线点进行兼容性分析,给出了一套完整的长大隧道贯通前洞内CPⅡ分多段测设技术。结果表明,采用分段测设方法不仅能够保障洞内CPⅡ控制网的精度以及各分段测设的洞内CPⅡ控制网之间的搭接精度,而且能够保障贯通后各段无砟轨道的顺利搭接。

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.