基于旋转图像拼接的大跨桥梁施工变形监测技术应用研究

Research on the Application of Deformation Monitoring Technology in Long Span Bridge Construction Based on Rotating Image Mosaic

针对基于图像处理的大跨桥梁施工变形监测中全景拍摄方式的测量难度大、精度低等问题,提出一种基于旋转图像拼接的桥梁施工变形监测方法。该技术通过旋转拍摄方式获得桥梁的图像,经过一系列算法处理后拼接成桥梁的等效正视图像,并对施工前后的等效正视图像进行处理,将图像中测点的位移数据转换为实际变形值,从而完成桥梁施工阶段的变形监测。将此技术应用在江苏省268省道京杭运河大桥主桥施工过程的变形监测,结果表明,与水准测量结果相比,桥梁变形值相对误差在10%以内,满足工程监测要求。

A bridge construction deformation monitoring method based on rotation image stitching is proposed to solve the difficulties and low accuracy of panoramic photography in image processing based deformation monitoring of large-span bridges.This technology obtains the image of the bridge through rotation photography,and after a series of algorithm processing,concatenates it into an equivalent front view image of the bridge.The equivalent front view images before and after construction are processed,the displacement data of the measurement points in the image is converted into actual deformation values,thereby completing deformation monitoring during the bridge construction phase.This technology has been applied to deformation monitoring during the construction process of the main bridge of the Jinghang Canal Bridge on Provincial Highway 268 in Jiangsu Province.The results show that compared with the leveling measurement results,the relative error of the bridge deformation value is within 10%,which meets the requirements of engineering monitoring.