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天津静海团泊曲棍球场主桁架呈四管弧形,跨度为121.86 m,质量达219 t,主次桁架节点类型为圆管相贯节点。针对主桁架呈大拱形、管径大的特点,以及圆弧弧度难控制,焊接点多及变形难控制等难点,进行了深入研究。采用临时支撑胎架辅助安装桁架,并合理安排焊接顺序及控制焊接变形,有效地加快了安装进度。临时支撑胎架四周设置缆风绳,保证了临时支撑胎架的稳定性。主桁架吊装由两边向中间合龙,次桁架由中间向两边安装;桁架主管高空对接采用定位板辅助安装,并使用全站仪校正支点的标高和位置,提高了安装精度。
The main truss of Tianjin Jinghai Mission Park hockey arcade has a four-arc shape, with a span of 121.86 m and a mass of 219 t. The types of the primary and secondary truss nodes are circular pipe intersections. In view of the main truss was a large arched, large diameter characteristics, as well as arc difficult to control the arc, the welding point and difficult to control the difficulty of deformation, conducted in-depth study. Adopting the temporary support of the tire rack to assist the installation of the truss, and arranging the welding sequence and controlling the welding deformation reasonably, the installation progress is effectively accelerated. Temporary support around the child carcass cable wind rope set to ensure the stability of the temporary support of the child carcass. The main truss is hoisted from the two sides to the middle and the secondary truss is installed from the middle to both sides. The truss supervisor adopts the positioning plate to assist the installation at high altitude, and uses the total station to calibrate the elevation and position of the fulcrum to improve the installation precision.