基于精度评定理论的高速铁路曲线桥梁水平位移监测方法分析研究

在桥梁水平位移监测中,基于当前高铁桥梁不规则线型增多的情况,针对传统精度分析方法只能掌握监测点沿桥梁中轴线垂直方向的偏差且是基于简易误差传播理论,而施工监测中需掌握沿某特定方向的精度。因此,结合跨淮河某桥梁,创新采用误差椭圆理论对小角法、角度交会法、距离交会等监测方法进行精度评定,结果认为小角法对于曲线桥梁适用性较差,而后方交会和极坐标组合方法能够产生较小的误差椭圆和点位精度,期望结论对相关桥梁工程有所借鉴。

Analysis and Research on the Monitoring Method of Horizontal Displacement of High-speed Railway Curve Bridges based on Precision Evaluation Theory

In view of the irregular linear increase of the current high-speed rail bridge identified in the monitoring of horizontal displacement of high-speed railway curve bridges,this paper demonstrates that the traditional precision analysis method can only identify the deviation in the vertical direction of the monitoring point along the axis of the bridge due to the simple error propagation theory,while,in the construction monitoring,it is required to hold the accuracy in a certain direction. Therefore,with reference to a bridge across Huaihe River,the error ellipse theory is used to evaluate the accuracy of small angle method,angle intersection method and distance intersection method. The results show that the small angle method is less suitable for the curve bridge,and the combination of the square and the polar coordinates can produce ellipse of less error and guarantee point position precision. It is hoped that the conclusions are helpful for relevant bridge engineering.