长大隧道双块式无砟轨道施工测量

双块式无砟道床施工测量精度要求较高，测量手段和方法较先进。通过GEDO CE轨检小车在铁路长大隧道双块式无砟轨道施工中的应用，对双块式无砟轨道施工测量的原理、方法、步骤进行了阐述和探讨。得出： 1）无砟道床达到设计功能的关键在于精调测量的过程控制； 2）静态精调中最主要的指标是对10 m弦长的轨道高低和轨向的控制，这2项指标的变化率将直接影响列车的动态检核验收。

Construction Survey for Bi block Ballastless Track in Long Tunnels

There are strict requirements for the construction survey of bi block ballastless tracks.The survey means and methods for the bi block ballastless track are very advanced.GEDO CE track inspection trolley is used for the survey of the bi block ballastless tracks in long tunnels. The principle, methods and procedures of the survey of bi block ballastless track are presented and discussed.Conclusions drawn are as follows: 1) The key for ballastless tracks to achieve the designed functions lies the process control of the fine adjustment survey; 2) The most important indexes of the static fine adjustment are the control of the elevation and direction of tracks with 10 m long chord and the variation of these two indexes will directly influence the dynamic acceptance of the works. 