铁路大跨度斜拉桥上无砟轨道精测网测设方法

Setting-out Method of Precision Network for Ballastless Track on Railway Large Span Cable-stayed Bridge

针对铁路大跨度斜拉桥结构刚度小、变形大的特点及在桥上测设无砟轨道精测网的要求,结合昌赣(南昌—赣州西)客运专线赣江特大桥主桥上测设无砟轨道精测网工程,介绍了该桥上各类控制点的布设原则、具体点位布置和精测网测量方法。该方法的优势在于可以使桥上稳定控制点尽可能多,且在测量过程中尽可能减小环境条件对点位坐标和高程的影响。该方案既可以用于指导赣江特大桥主桥上精测网测设,对同类项目也具备一定的参考价值。

The railway large span cable-stayed bridge has the characteristics of small structural stiffness and large deformation.So it is worthwhile to study whether the precision network can meet the setting-out requirements of ballastless track on the bridge.Combining with project of ballastless track precision network on the main bridge of the Gan River super-large bridge of Nanchang-Ganzhouxi passenger dedicated railway,this paper introduced a scheme including the principle of laying all kinds of control points,the layout of detailed points and the survey methods of the precision network on the bridge.The advantage of this scheme is that the stable control points on the bridge are as many as possible and the inf luences of environment on coordinates and elevations of the points are as few as possible during the survey process.This scheme can be used not only to guide the setting-out of the precision network on the main bridge of the Gan River super-large bridge,but also to provide some reference for similar projects.