Research of Intelligent Hoisting System for Steel Truss Girder of Long-span Railway Suspension Bridge in Mountain Area
Research purposes:In difficult and dangerous mountainous and canyon areas,the site is generally small and the construction conditions are relatively poor.To solve the problems of difficult erection and splicing of heavy steel truss girders,difficult control of the main cable shape,long installation and construction time,and multiple safety hazards in mountainous and canyon areas,based on the steel truss girder erection project of Jinsha River Super Large Bridge on Lijiang-Shangrila Railway,aiming at the common problems in the erection of heavy steel truss girders,this paper has developed an intelligent hoisting system for steel truss girders of long-span mountain railway suspension bridge.The system digitizes the key elements and processes in the erection of steel truss girders through the Internet of Things and cloud computing related technologies,and through scientific sensor collection,data analysis,feedback control and other process links,in order to transform the steel truss girder erection process into precise and controlled automated operations,save project costs,ensure project safety,and improve construction efficiency.Research conclusions:(1)The developed intelligent hoisting system for steel truss girders provides a set of feasible system solutions for the erection of heavy steel truss girder in mountainous areas,which has been verified to be feasible after the project implementation,and can meet the construction needs and solve the difficult problem of erection and splicing of heavy steel truss girder in suspension bridges in complex environments.Compared with the traditional mode,it realizes the convenience of use and operation.It can significantly improve construction efficiency.(2)After engineering verification and implementation,the developed intelligent hoisting system for steel truss girders can achieve measurement and control accuracy of centimeter level,feedback control time response speed of second level,and achieve an average of 4.5 hours to complete the installation of double segment heavy steel truss girders.The entire installation process controls the lateral swing angle of the double segment steel truss girders to be below 1.23°,and the longitudinal swing angle to be below 1.51°,the deviation of the cable tower is less than 5 cm,and the center angle of the lifting tool meets±1.5°or less.(3)The adoption of an intelligent hoisting system for steel truss girders based on the Internet of Things and cloud computing technology can achieve the digital work of steel truss girder facilities,forming a set of original technological achievements that can be promoted,which can provide valuable experience for the construction of structures such as large tonnage steel truss girders in the future,and has broad prospects for promotion and application in mountainous areas and large tonnage steel girder erection construction.
railway suspension bridgesteel truss girderinstallation constructionintelligent monitoring and liftingresearch and developmentengineering application
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