基于精确大地测量技术对公路桥梁结构变形监测研究

摘要

In view of the settlement phenomenon and the structural deformation of the newly built highway bridge,the highway bridge deformation monitoring scheme is designed.Xiang-shi highway bridge was selected as an example,case study:selected four monitoring stations,six control points and 22 bridge deformation monitoring,design the network measurement;the seven parameter transformation method of different observation period of monitoring station coordinates transform,eliminates the LED from different observation epochs of observation error.The results show that example bridge in 2014 December 2015 De-cember overall settlement value is 25 mm,cross in maximum vertical deformation value of 20 mm;In the whole process,the overall structure of the bridge is stable,and the uneven settlement is not happened.%针对新建成投入使用的公路桥梁产生的沉降现象及结构变形问题，设计了公路桥梁变形监测方案。以襄十高速襄武段公路桥梁为例，进行实例研究：选取4个监测站、6个控制点以及22个桥梁变形监测点，设计了测量网络；采用7参数转换法对不同观测期的监测站坐标进行变换，消除了因观测期历元不同所导致的观测误差。结果表明算例桥梁在2014年12月～2015年12月内整体沉降值为25 mm，跨中最大竖向变形值为20 mm；在整个使用过程中桥梁整体结构稳定，并未产生不合理变形以及倾斜等不均匀沉降问题。