Research On Intelligent Technology For Construction Monitoring Of High-speed Railway Continuous Beam Bridge Based On BIM

The construction of high-speed railway is related to national economic and social development."Replacing roads with bridges" is an important measure of high-speed rail construction.Construction monitoring is an important part of bridge construction and an important technical support to ensure the safety of construction personnel.With the development of BIM technology,BIM provides effective technical measures for improving the intelligent level of bridge construction and monitoring.The background of this article is Xinyi Bridge of Lian-Xu Railway,and BIM was chosen as the core.The research and application of BIM technology in the construction and monitoring of high-speed railway bridges was carried out.The aim is to improve the efficiency of high-speed railway bridge construction management,optimize the continuous beam construction monitoring program,and establish an intelligent platform for high-speed railway continuous beam construction monitoring.The main research work is as follows:(1)BIM modeling and construction application of high-speed railway continuous beam bridge.Autodesk Revit was selected as the core BIM software.The method of bridge structural decomposition and parameterized family creation was studied.Superstructure,substructure,construction facilities and other families of continuous beam bridges were established and formed a family library.On the basis of family library,and combined with the construction site model generated by tilting photography of UAV,construction model of continuous beam bridge was established.Based on the construction model,the application method of BIM technology in visual construction,positioning of prestressed steel cable holes,drawing of pre-embedded holes and calculation of construction bracket were clarified.The application of BIM technology was realized.(2)Generation of finite element model of high-speed railway continuous beam bridge based on BIM.According to characteristics of the Midas Civil MCT format and the interface form of Revit software API,the RTM plug-in was developed using C#language and integrated into the Revit interface.The RTM plug-in can automatically extract the nodes,elements,section parameters,materials and other data required for finite element calculation from the bridge BIM model,and output MCT files in a standard format.Midas Civil can directly read standard MCT files,and then automatically generate bridge finite element models,which provide support for the stress analysis of bridge construction and design of construction monitoring.(3)Design and application of construction monitoring scheme for high-speed rail continuous beam bridge based on BIM.Based on the established construction model of high-speed railway bridge,the model of the monitoring equipment was supplemented.Meanwhile the optimal scheme of stress sensor,video monitoring and instrument cable arrangement was selected and determined.The visualization and refined design of the bridge construction monitoring scheme were realized by the model.The correlation module of stress measuring point and sensor model,and the real-time reading module of stress data were developed.The stress monitoring data can be directly consulted in the BIM model,and the warning function based on threshold overrun was realized.(4)Development and application of intelligent monitoring platform for high-speed railway continuous beam bridge construction.Based on the construction project of the Xinyi Bridge,according to the current application of the construction management platform,the framework of construction monitoring intelligent management platform is designed.Using the Unity platform and Web technology,a construction monitoring intelligent management platform is established,which realizes the functions of electronic sand table,concrete quality management and control,bridge construction monitoring management,engineering quality management and expansion.With the help of OpenCV and YOLO v3,the helmet detection function of construction personnel was realized.The image recognition module was imported using the RTSP video stream format,and the real-time detection application of helmets on the construction was implemented.