Research On Urban Rail Transit Line Design Method Based On 3DGIS And BIM

Urban rail transit has become an effective way to solve public transportation problems because of its advantages of large volume,fast,comfortable and low pollution.Urban rail transit line is mainly through the city center area,line along the trend and spatial location choice will directly affect the living conditions of the residents and city landscape construction,and the traditional design method of route planning is difficult to find potential conflicts in the complex urban environment problems,such as underground line collide with the underground pipe network construction of pile foundation,the ground line and elevated line to bring the noise of the city planning and landscape.The line selection method based on 3DGIS visual environment can visually evaluate the design effect,and the detailed BIM model can be used as the information source to conduct spatial query and environmental impact assessment more intelligently,effectively improving the existing deficiencies in the current urban rail transit design methods.Based on 3DGIS and BIM technology,this thesis studies the theoretical methods and key technologies involved in the three-dimensional line design of urban rail transit,and completes the development of the three-dimensional space line selection system of urban rail transit.The main research contents and results of the thesis are as follows:Based on the City Maker SDK component,a 3D spatial line selection system was developed,which mainly studied the issues related to the rapid construction of 3D urban landscape,3D spatial line design method,rapid modeling of line construction BIM,and line scheme optimization.(1)According to the characteristics of urban road structure,the urban road network with real geographical characteristics is quickly generated in City Engine through Python script and imported into the three-dimensional urban environment.A fast modeling method of three-dimensional urban landscape is proposed to realize the rapid establishment of models of urban architecture,water system and sketches.(2)Combined with the Code for Design of Metro(GB50157-2013),the relevant provisions of the system studied the circuit parameter calculation method,data structure and curve elements based on City Maker platform development of urban rail transit line 3D design subsystem,solved the line curve elements of the model rendering,line dynamic adjustment,labels,insert,extract the center line of the line data,realized in three-dimensional space of rapid design of urban rail transit lines.(3)Based on the data of line center line and Revit API,the parametric establishment and automatic assembly of BIM model for rail transit line construction are realized.Based on the real pipeline data and geological drilling data,the urban underground pipe network model and geological entity model are established quickly.(4)This thesis summarized the data fusion mechanism of BIM and 3DGIS,studied and analyzed the compatibility and optimization ability of City Maker platform to BIM data,and based on the methods of spatial query and intersection analysis of City Maker SDK,realized the rapid determination of the impact range of the line and the collision detection analysis of the railway structure and the existing urban structure,providing solutions for the optimization of the line scheme.