BIM-based Urban Rail Line Planning And Design Research On Environmental Modeling Methods

The urban rail transit line selection environment is complex and variable,facing many potential conflicts between the above-ground buildings and the underground pipe network.In the planning of the line,in addition to the technical specifications,investment costs,etc.,but also the impact on the surrounding environment.A simple two-dimensional design environment can meet the technical requirements of the line,but it cannot intuitively find some potential conflicts.Therefore,creating a visual three-dimensional environment to meet the needs of urban rail transit route planning and avoiding the defects of the design process becomes the current flaw.The problem to be solved.Based on this idea,based on the InfraWorks 3D visualization platform,this paper studies the urban 3D terrain,the above-ground 3D scene and the visual modeling method of underground pipelines.Based on the principle of line vertical and horizontal design,the urban rail transit selection in 3D visualization scenarios is realized line design.The main research contents and results of the thesis are as follows:(1)Exploring four methods based on InfraWorks 3D terrain creation.Based on the acquired urban building contour data,the modeling of urban ground three-dimensional scenes is carried out.This method ensures the accuracy of the location of the above-ground buildings.It has great reference value for the subsequent route planning work.(2)For the problem that the appearance of the architectural model in InfraWorks is not refined enough,the refined modeling in the Revit platform is proposed.The collaborative design of these two platforms not only solves the problem of the degree of refinement of the model,but also realizes the deepening design of the elevated bridge assembly.(3)The three-dimensional visual modeling method of underground pipe network based on collaborative design of InfraWorks and Civil 3D platform is studied.The geometric characteristics and data structure of the underground pipe network are analyzed,and the Civil 3D is developed twice to realize the automatic modeling of the underground pipe network data in the two-dimensional plane,which solves the modeling problem of massive underground pipe network data.Combined with the InfraWorks platform,the two-dimensional underground pipe network model is transformed into a three-dimensional visualization state,which provides a reliable basis for urban rail transit route planning.(4)Studying the principles of urban rail transit route planning and design,creating an underground tunnel and bridge model that satisfies urban rail transit,and realizing the preliminary implementation of the rail transit route based on the three-dimensional scene of the above-ground buildings and the visual environment of the underground pipeline network in InfraWorks.planning.For the preliminary planned completion of the InfraWorks,the design can be further deepened in the Civil 3D to improve the design quality.(5)Realize the roaming display of the planned design route scheme in the three-dimensional environment,visually and clearly check the surrounding environment of the line,and find out whether there is conflict with the surrounding buildings and the underground pipe network in time,and provide reference for the feasibility of the circuit design scheme.