基于近景摄影测量的多模型盾构管片检测方法

A Method of Shield Segment Detection Based on Close Range Photogra mmetry

针对传统管片检测方法费时费力、检测结果可识别程度低、以圆为基础模型的检测方法存在较大误差等问题,提出了一种基于近景摄影测量的自动化管片检测方法。在盾构管片上设置标志点,通过近景摄影测量获取标志点空间坐标,以此为依据同时使用圆和椭圆两种基础模型拟合管片,求解管片特征值,对管片拼装质量和管片姿态进行检测。实验结果表明,两种模型对管片中心点检测结果误差都在2.7 cm以内,均满足管片检测精度要求,结合自定义用户界面,该方法能够高效便捷地完成管片检测;通过比较两种模型的检测结果,椭圆模型检测精度高0.5 cm左右,以椭圆为基础模型可以提高盾构管片检测精确度。

Traditional segment testing methods has several problems.It is a waste of time and energy.The test result is of low degree of recognition,and the method based on circle as basic module has relatively large error.In order to solve the above problems with the high precision,this paper proposes a new automatic testing method for segment testing based on close-range photogrammetry.The method tries to obtain the space coordinates of marks on the segments by close-range photogrammetry.Then it builds different modules for shield segments testing and compares their calculation accuracy.After writing the program to achieve data autonomous solver calling,test results and images will be displayed on the user interface in real time.Through experiments,basic module based on oval can improve the result accuracy of shield segments testing by about 0.5 cm.This method can get the segment testing results effectively and conveniently,which meets the precision requirement.