| The BIM-based 3D real-world model has the advantages of powerful engineering data interaction and high-precision reading of engineering geometric parameters.In the field of modern engineering,compared with the traditional three-dimensional model,it has the disadvantages of poor data integration and simulation capabilities and has a high level of research.value.In recent years,the application of BIM-based 3D real-model has started late,and the application of model data acquisition,model accuracy and practical engineering still lacks in-depth and systematic research work.In view of this,this paper is based on BIM’s 3D real-world modeling method,combined with UAV data acquisition technology,the optimal method for the tilt image data acquisition of UAV,the influence factors and control methods of model accuracy,and the road and bridge engineering The 3D real model application was studied.The main research contents and conclusions are as follows:(1)Based on the reconstruction theory of 3D real model,the impact of model error on the data acquisition methods of conventional UAV tilt photography,such as single lens multiple data acquisition and multi-shot single data acquisition,was compared and analyzed,and the optimum was obtained.The method of human-machine tilt image data acquisition,that is,the multi-shot single-time data acquisition method has the advantages of rapid economics and small influence of the camera exposure,and is the optimal data acquisition method.(2)Combined with the principle of drone aerial photography,a comprehensive study was made on the influencing factors of the accuracy of the 3D real model.In the process of tilt photography of UAV,the flight altitude,heading overlap ratio,sideward overlap ratio and camera tilt angle are selected as the influencing factors of the model accuracy.Through experiments on the modeling accuracy of the actual badminton court under different influencing factors,the dimensional errors between the model and the actual badminton court were compared and analyzed,and the influence of various factors on the accuracy of the model was obtained.Through the analysis of the influence laws,the optimal range of each factor was obtained.(3)Based on BIM’s 3D real-world modeling method and UAV tilt photography data acquisition technology,the application of BIM 3D real-world model in construction site management and bridge appearance inspection in road and bridge engineering was studied.In the actual project,the precision error analysis was performed on the 3D real-world model based on BIM technology.The results show that the 3D real-world model based on BIM can accurately perform the construction management control and the bridge appearance inspection work in the road and bridge project.The 3D real model is Construction applications in practical projects have high reliability.Based on theoretical analysis and field experiments,this paper proposes a control technique based on BIM’s 3D real model modeling accuracy,and realizes the application of BIM-based 3D real model in road and bridge engineering. |
