三角高程测量在高铁特大桥无碴轨道施工测量中的应用

高速铁路轨道铺设在平面和高程上要求很高的位置精度。但在桥梁施工后，已很难用几何水准测量方法将地面上水准点的高程传递到桥面上。本文介绍了在高速铁路特大桥无碴轨道施工测量中，采用三角高程测量方法将地面水准点的高程传递到桥面临时水准点上，使CPⅢ精密水准测量能与地面二等水准点附合，以满足无碴轨道施工测量要求。

construction survey high speed railway ballastless track on huge bridge

However very high position precision is required in laying tracks of high speed railway both in horizon and elevation, it is very difficult to transmit the elevation of the bench mark on the ground to the bridge with geometric leveling when the bridge construction has been completed already. In this paper, a method with trigonometric leveling is introduced. It can conveniently transmit the elevation of the bench mark on the ground to the temporary bench mark on the bridge, and connect the precise leveling of CPⅢ to the second grade bench mark on the ground. It should meet the requirement in construction survey of high speed railway ballastless traek.