桥梁与隧道GPS网的设计与应用

计算了江阴公路长江大桥GPS网所能达到的精度,阐述了隧道GPS网布设的一般规律,对长梁山13km隧道实测GPS网进行了计算。从比较分析可以看出:1)GPS网能够满足桥梁和隧道工程的精度要求;2)在GPS网中适当加入一些高精度的边长有利于提高GPS网的精度和可靠性,并使得最后GPS网的尺度与施工测量时保持一致;3)GPS用于隧道与桥梁工程测量具有精度高、工期短、效益高等特点。

Design and Application of Bridge and Tunnel GPS Network

Normally, we should design the network before surveying with certain precious requirements. This essay explores the theory of the GPS network design for the bridge and tunnel project. We also calculate the precision of the GPS network of the Jiangyin Yangtze River Bridge. According to the calculated result of the GPS network for the tunnel project, the length of the direction side directly affects the lateral pierce error. We calculate the surveying data coming from 13 km long Changliangshan tunnel of the Railway in Shanxi province, we also compare these results with the data coming from the normal precious surveying and get following conclusions: the first, the GPS network can satisfied the precision requirements of the bridge and tunnel project; the second, if we add some high precision side observations into the GPS network, the precision and the reliance of the GPS network can be raised, otherwise, the finale scale of the GPS network and the scale of the construction surveying will be the same with one accord; the third, using GPS in the bridge surveying and the tunnel surveying has a lot of advantages: high precision, less working time and high efficiency.