超高层建筑环带桁架与伸臂桁架的施工方法

CONSTRUCTION METHODS FOR RING BELT TRUSS AND OUTRIGGER TRUSS OF SUPER-HIGH BUILDING

在超高层建筑环带桁架与伸臂桁架施工中,应用BIM技术进行设计优化和深化,通过钢桁架合理分段确定小拼单元,优化铸钢节点设计,确定铸钢节点重心及吊绳布置;通过施工工况模拟确定吊装方案、施工顺序和伸臂桁架终固时间;采用数字模拟预拼装与工厂预拼装技术控制构件加工质量;采用巨型铸钢节点多点吊装技术,通过精确调整铸钢节点安装过程姿态,使构件快速准确就位;对钢桁架焊接顺序进行施工模拟,有针对性地进行焊接工艺评定,有利于释放焊接应力并减少焊接变形,节省了工期,降低了成本。

BIM Technology is applied to optimize and deepen the design of ring truss and outrigger truss construction method of super high-rise building,to reasonably segment the steel truss,to determine the small assembly unit,to optimize the design of cast steel joint,to scientifically determine the center of gravity of cast steel joint and the layout of lifting rope.The simulation of construction conditions is carried out,and the hoisting scheme,construction sequence and final fixing time of outrigger truss are reasonably determined.Digital analog pre-assembly and factory pre-assembly technology are used to control the processing quality of components.The multi-point hoisting technology of giant cast steel joints is adopted to precisely adjust the posture of cast steel joints in the installation process,so as to make them quickly and accurately in place.The simulation of steel truss welding sequence construction and welding procedure qualification are beneficial to release welding stress and reduce welding deformation.Advanced technology saves construction period and reduces construction cost.