Research And Application Of BIM-based Design Technology Of Continuous Girder Bridge Zero Block Bracket

Block Zero cantilever pouring is a key process in the construction of continuous girder bridge,due to the structure of Block Zero,the height and form of piers,the existing materials on site,the working habits of the operation team and other on-site construction technical conditions,etc.,a variety of Block Zero support schemes can appear,and lead to different construction costs,construction periods and safety control difficulties.Although the design,calculation,drawing and takeoff of block zero bracket can be completed by using existing technology,there are still common problems of poor coordination,low efficiency and difficulty in optimizing design in all aspects of design,especially when there are many block zero bracket projects in a tender.Based on the shortcomings of the existing technology,this paper takes the zero block of the whole bridge of the Guangzhou to Qingyuan intercity rail transit project as the engineering background,and explores a special zero block bracket design based on BIM technology,and completes the calculation,drawing,takeoff and cost analysis of the integrated bracket design method,the specific research content includes:(1)Continuous beam zero block bracket scheme co MParison.From the characteristics of bracket arrangement,characteristics of supporting components,and connection methods between components,the common bracket types of existing Block Zero were classified and analyzed,and the scheme of Block Zero bracket of the whole bridge of Block Zero of the Guangqing North Extension Line was co MPared and selected by combining the topographic and geomorphological characteristics of the construction site,the surrounding construction environment,and the main structural characteristics of Block Zero.(2)Select the scaffold scheme for BIM model construction.Analyze the structural characteristics and arrangement of the main structure of block zero and each component of the bracket,and use the Revit API provided by Autodesk to compile the parametric 3D model construction plug-in in combination with the C#programming language to realize the parametric modeling of the body of block zero and the structure of the bracket.(3)Analysis of mechanical behavior of continuous beam zero block support.The engineering algorithm method commonly used by Block Zero is studied,relying on the common points of BIM and finite element model information,and using secondary development technology to realize the conversion of BIM model and finite element model,and achieve the purpose of collaborative calculation using BIM technology.(4)Subsequent deepening application and research of BIM model.According to the constructed BIM model,the rapid optimization of the scaffold scheme,the rapid export of drawings,and the efficient statistics of engineering quantities can be realized.According to the BIM technology,the on-site cost control of the bracket is analyzed,and the construction plan cycle of the bracket is optimized based on the principle of cost minimization,which realizes the application value of BIM model in construction management.