Research On Railway Entity Location Design And Automatic Modeling Based On BIM

With the advent of the era of "new infrastructure" and the continuous application of BIM Technology in the process of railway design,the design method of railway line selection is changing from the traditional two-dimensional line center line design to the new three-dimensional entity line location design.In the process of3 D solid line selection,the automatic modeling of railway line BIM model is the key and difficult point.Aiming at this key problem,this thesis studies the automatic modeling method of railway line BIM model based on Bentley BIM platform:(1)The railway entity location design technology based on openrail conceptstation is studied.The 3D geographic environment is created in openrail conceptstation software,the technical process of railway 3D entity location design is studied,and the railway line entity conceptual model is quickly created,which provides ideas and basis for further research on automatic modeling of line BIM model.(2)The automatic modeling method of line structure assembly based on openrail designer is studied According to the structural characteristics of the line structure composed of standard components,the standard unit model library is established,and the automatic assembly modeling of the structure model is realized.(3)The automatic modeling method of line structure layout style based on openrail designer is studied.Aiming at the structure with linear feature and variable cross-section feature in railway line,the control method of its cross-section profile is studied,and the parameterized cross-section template library is designed to realize the automatic lofting modeling and parameterized control of the structure model.(4)This thesis studies the secondary development technology based on openrail designer,and carries out the program implementation and example verification for the automatic modeling of line structure.Through the development of the program,the automatic assembly and lofting of the cell model in the cell library and the template in the template library are realized.Finally,the research method is verified by an example.The research results of this thesis can help promote the in-depth application of BIM technology in railway location design,lay a certain foundation for the forward design of railway line BIM,and provide reference for the BIM line location design of highway,electric power,pipeline and other strip engineering.