Research On 3D Modeling And Visualization Of Underground Pipelines

As an urban infrastructure,underground pipelines play an important role in energy supply and information circulation.The amount of data in underground pipelines is increasing day by day.The traditional two-dimensional pipeline management system is difficult to visually express the intricate spatial relationships between underground pipelines,and there are also certain limitations in spatial analysis.Therefore,domestic and foreign scholars have conducted research on three-dimensional pipeline management systems of different architecture types,which largely make up for the shortcomings of two-dimensional pipeline management systems.Component or mathematical methods can be used when creating a pipeline 3D model,the model generated by the mathematical method has a smooth surface and high connection accuracy.On the other hand,most of the existing pipeline 3D management systems are C/S architecture,the B/S pipeline management system based on the Cesium framework can overcome the shortcomings of the traditional B/S architecture system and has the characteristics of no plug-ins and cross-platform.Therefore,this article first studies the mathematical methods to create pipeline 3D modeling,and then designs pipeline 3D management systems with different architecture types,and realizes some functions.The main content can be summarized as the following:(1)According to the types and characteristics of underground pipelines,the underground pipeline database is designed,and the underground pipeline data is managed by the data structure of pipe points,pipe sections and pipe network layer.Calculate the detected underground pipeline data to get the pipeline starting data.Take the circular section pipeline as an example to introduce the method of understanding the actual coordinates of the discrete points of the pipeline section.(2)The following modeling methods are proposed for different types of pipeline connecting parts,including:for connecting parts of equal diameter and reducing elbows,using Bezier curve to fit the central arc of the elbow to obtain interpolation points,and the method of inserting discrete cross-section is used to complete the modeling;For the four-way and T-shaped connecting parts,the method of obtaining the key points on the intersection line by the spatial elliptic parameter equation is used to complete the modeling;For the connecting parts of the reducing diameter,the method of simulating the transition surface at the reducing diameter is completed the modeling;For right-angled three-way components,the method of spatial intersecting ellipse and spherical surface is used to complete the modeling.(3)Designs the C/S and B/S structure of the underground pipeline 3D management system,realizes some of its functions,and verified the use of mathematical methods for 3D pipeline modeling.The main functions of the C/S part are data storage,data query and display.On this basis,three-dimensional function modules have been added to further realize the spatial analysis functions of pipeline cross-section analysis,connection analysis,and pipe burst analysis.Using WebGL and Cesium platform to build a pipeline management application with B/S architecture,it realizes the functions of glTF format model loading,browsing and interaction,attribute query and pipeline positioning.In summary,the three-dimensional pipeline model drawn by mathematical methods can well solve the problem of surface cracking when the model is connected,and has a higher connection accuracy.At the same time,the remote pipeline management program is explored,the B/S program based on Cesium can provide a new idea for solving the problem of pipeline remote management.