Steel Structure Net Frame Installation Technology
The key position of steel structure mesh frame installation In the field of modern construction, steel structure mesh frame is widely used in large-scale public steel structure buildings such as stadiums, exhibition halls, terminal buildings and other large-scale public Industrial Steel Frame buildings due to its unique advantages, such as reasonable spatial force, light weight steel structure, high stiffness, beautiful modelling and the ability to achieve large-span steel structure building coverage, and so on. The quality and efficiency of steel structure net frame installation is directly related to the stability, safety and overall function of the Steel structure building. The installation process needs to be based on project characteristics, site conditions and technical requirements, and the appropriate method should be carefully selected. This paper focuses on the two common installation methods, namely, overhead bulk installation and overall skidding, and analyses their principles, processes, advantages and applicable scenarios, aiming to provide useful references for relevant engineering practices.
A large sports Steel Structure building stadium project, the complex shape of the grid structure, in order to meet the demand for multi-functional use, the internal space layout is irregular, and the venue around the Industrial Steel Frame Building is dense, the site is narrow, large lifting equipment is difficult to perform. After a comprehensive assessment, the Industrial Steel Frame Building team decided to adopt the overhead bulk method. During the construction process, the biggest difficulty was to ensure the accuracy and safety of the aerial work. To solve the problem of accuracy, the project team was equipped with a high-precision total station to monitor and adjust the installation position of each pole in real time to ensure that the error is controlled within a very small range. To address safety issues, in addition to building perfect safety protection facilities, the project team also developed a strict safety management system in Industrial Steel Frame Building, such as daily pre-construction safety training and safety inspections. Industrial Steel Frame Building through fine construction organisation and strict quality and safety control, the project successfully completed the installation of the net frame, with steel structural building stability and safety meeting the design requirements, laying a solid foundation for the smooth operation of the subsequent venues. (II) Case Analysis of Integral Sliding Method In the station steel structure building project of Nanchang East Railway Station, the steel structure building of triple-arch roof weighs 2,400 tonnes, and it was originally planned to set up temporary support for assembling after the completion of the main structure of the elevated waiting room; however, this plan has many cross construction operations, great construction difficulties and great pressure on the schedule. After 7 times of comparison and demonstration, the ‘horizontal slip’ programme was finally adopted. The assembly platform was set up outside the construction area, and after completing the assembly of the steel structure, the roof structure was slid to the designated position for unloading by means of a track laid on the elevated waiting level. This programme has significant advantages, not only reducing the safety risk of cross operation, but also providing a working surface for roof panel installation and other subsequent construction, accelerating the construction progress, and ensuring that the node schedule target of the whole project is met. The application of the overall synchronous sliding technology for the steel structure of the triple-arch roof of Nanchang East Station is the first case in the national railway station project, which provides valuable experience for the steel structure installation of similar large-scale projects.
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