BIM-based Urban Underground Space Modeling Technology

At present,China's urbanization process is developing at a high speed.The development of urbanization is not only fast,but also expanding on a large scale.In this process of rapid development,the problems are inevitable.The rapid development of China 's economic construction is accompanied by the acceleration of urbanization,and the urban population is on a sharp upward trend.The existing ground is far from enough to meet human needs.The rapid reduction of available space on the urban ground is inevitable and also an urgent problem to be solved.It is imperative to develop and utilize urban underground space,which has become an important direction of urban development.Looking at the development of mega-cities at home and abroad,from their experience,the extension of urban development space from top to bottom has become the dominant trend.This paper studies the development and construction of two-dimensional and three-dimensional integrated underground space system based on Revit platform.The system is developed with C/S architecture model,the development language is the latest graphical interface development technology of Microsoft,and the database is based on Microsoft S Q.The L Sever relational database stores basic data and wall thematic data,builds a standard-based,open,scalable and shared information platform,and provides a business system for the management and maintenance of urban underground space.The main work and research contents of this paper are as follows:1.Firstly,the research background and significance based on BIM platform are expounded,and the technological relationship and development status between BIM technology and three-dimensional modeli ng are reviewed.The application of BIM technology in CAD information extraction is proposed.2.Summarize and study the relationship between BIM and Revit,the system integration and working mode of Revit technology,and combine BIM and GIS technology to complete the collaborative design of underground spatial database3.Extracting CAD point and line models.Call the external comm and Revit External Command in the Revit API and command Data in the external application command.Use C#language to redevelop the Revit and customize the IExternal Application interface,so that the Revit software can automatically create batch models4.The experimental data in this paper come from the building CAD map of Wuhua District,Kunming City,Yunnan Province.Using the secondary development Revit to automatically read the external application function at the database level,the AD data are preprocessed and analyzed,and the typical data blocks used for research are extracted.The three-dimensional model is automatically generated in Revit,and the functions of three-dimensional roaming,query analysis,statistical calculation and spatial analysis of the three-dimensional model are realized The extraction content includes:ground point,elevation,axis network,wall,beam,column,floor,curtain wall,roof and so on to generate the final three-dimensional model products.Finally,this paper summarizes the content and prospects.