Abstract:

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. 

Key words: biblock ballastless track, geometrical dimension, trackinspecting trolley, rough adjustment, fine adjustment