RESEARCH ON KEY TECHNOLOGIES FOR CONSTRUCTION OF LARGE SPAN PRESTRESSED STEEL BOX BEAMS
Taking the interactive intelligence project No.20 factory building as an example,this study ana-lyzed the complex construction conditions of large-span prestressed box girders.Taking into account factors such as floor load,steel component weight,and on-site construction conditions,the study adopted the construction approach of"floor assembly welding+prestressed graded tensioning+hydraulic overall lifting".Using Tekla model design soft-ware,a bottom distribution steel beam was designed and arranged on the board surface as the bottom support sys-tem for the steel components in the lifting area,for the assembly and welding of the steel component board surface.Design,manufacture,and install a hydraulic lifting platform on the side of the steel column for the overall hydraulic lifting of the assembled and welded steel components in the lifting area.Based on the on-site construction condi-tions,design a buffer device for overall hydraulic lifting under eccentric working conditions and a multi-point syn-chronous forward and reverse buffer circuit to ensure the stability of the lifting moment of large-span prestressed box girder under eccentric working conditions.The safety of the hydraulic lifting process was ensured through technical measures such as arranging the bottom beam,overall hydraulic lifting,simulating the lifting process,and buffering and returning devices,ultimately meeting the project schedule requirements.
steel box girderprestresslarge spanhydraulic liftfinite element analysis
万方数据
维普
