The deformation mechanism of railheight decrease was put forward by means of laboratory simulation.
通过试验室模拟，提出了轨高减少的变形机理。
2
To install the crane span before installation, camber, level of metal structure of main girder bending, trolley railheight difference, gauge deviation, diagonal bridge survey.
The contour size changes of rail before and after straightening, involving width of rail head, railheight and rail length, were measured. The causes of railheight decrease were analyzed.