Environmental Safety Evaluation Of Drainage Pipe Network Reconstruction Based On BIM

Urban underground pipeline is a pipeline and its ancillary facilities, such as water supply, drainage, gas, heat, electricity, communication, radio, television, industry and so on.It is an important infrastructure to ensure the operation of the city. People call it “lifeline”.It bears the city information and energy transmission, drainage and mitigation, waste discharge and other tasks. However, in our country, owing to the reasons that there are too many departments of underground pipelines’ management, and these pipelines are managed at the same time by several sides while the responsibility is not well defined, also the history of the cities’ development is far-reaching which has resulted in the badly lack of materials, it is difficult to master the actuality of pipelines in old cities so that correct judgment is hard to be made in the project of pipelines’ remould. Due to the limited space representation and analysis, the traditional two-dimensional design can not do three-dimensional communication. BIM software can be a good solution to this problem using its unique three-dimensional model and collision check function.On the basis of research and analysis on current BIM technology and its actual application in the remould project of underground drain-pipe network, this paper will be combined with a certain remould project of pipe network in Shenzhen for the structural analysis and the simplification of drain-pipe network in accordance with the principle of 3D modeling. Construction of three-dimensional model of drainage pipe network in the project scope and collision check. The collision points were 69, of which the number of the rain pollution collision points was 42, the proportion was 60.9%; the number of rain rain collision points was 18, the proportion was 26.1%; the number of sewage pollution collision points was 9, the proportion was 13%. According to the different types of collision,three kinds of collision modes are proposed, all collision points are classified and analyzed.On this basis, continue to build other professional pipe network model. According to the results of the statistical analysis: all professional and drainage network collision points for a total of 710, which water supply- drainage collision point for 265, the proportion was37.3%; electrical- discharge impact point was 187, the proportion was 26.3%.Communication- drainage collision point is 258, the proportion was 36.4%. At the same time, the surrounding environment has an impact on the drainage pipe network transformation, so the need to introduce environmental factors. And using the improved analytic hierarchy process IAHP to combine the factors and the impact point,The calculated influence coefficients were 3.11, 2.74, 3.75, 3.21. to find out the influence of environmental factors and multi professional pipeline under the common influence of the drainage pipe network reconstruction project.At the end of this paper shows that the proposed model of 3D pipeline construction method is effective in the actual construction plan of the engineering project for feedback,with higher accuracy and reliability. This study has significance because the domestic network reconstruction project and less use of BIM technology to other domestic similar engineering.