Research on Alignment Control and Ballastless Track Laying Technology of Extradosed Cable-stayed Bridge
In response to the high precision requirements for static laying of ballastless tracks on high speed railways and the difficulty in controlling the alignment of long span bridges,Taiping Lake extra large bridge with a main span of 2×228 m three towers extradosed cable-stayed bridge on the Chizhou-Huangshan high speed railway was taken as the research object,and a finite element model was established to analyze the influence of design parameters such as the stiffness of the main beam,the secondary tensioning sequence of the cables,and the benchmark temperature of track laying on the main beam alignment.An alignment control scheme for the main beam was proposed.Based on the on-site conditions,the construction process of ballastless track laying was tracked throughout the entire process,and the theoretical design parameters and main beam alignment were optimized step by step.After the completion of track laying,the deviation between the top elevation of the track and the design elevation,as well as the static height unevenness of the track,were measured,and the results met the accuracy standards for static laying of ballastless tracks.
万方数据
维普
