合江长江一桥200t级钢管拱肋节段拼装工艺

Assembling Technology of 200 t Steel-tube Arch Rib Segments in Hejiang Yangtze I Bridge

文章结合世界最大跨径钢管混凝土拱桥——主跨530m合江长江一桥的200t级钢管拱肋节段拼装工程实例,介绍了卧拼和立拼两种钢管拱肋节段拼装工艺方法,指出两种工艺都是可行的,立拼工艺更接近拱肋安装施工的正式状态,而卧拼工艺可以大大提高施工的效率、经济性和安全性。通过立拼检验证明,当控制轴线偏位在±3mm以内时,卧拼工艺可以达到规范规定的精度,200t级钢管拱肋节段拼装推荐采用卧拼方法。

Combined with the 200 t steel-tube arch rib Segment assembling engineering example of the world＇s largest span steel-tube concrete arch bridge-Hejiang Yangtze I Bridge with main span of 530m, this article introduced the assembling technology method of horizontal assembling and vertical assemb- ling of steel-tube arch rib segments,pointed out that these two processes are both feasible,the vertical assembling process is much closer to the oflicial state of arch rib installation and construction,while the horizontal assembling process can greatly improve construction efficiency, economy and safety.Through the inspection vedfication of vertical assembling,when the control axis deviation is within ± 3 mm,the horizontal assembling process can achieve the accuracy required by the specification,and the horizon- tal assembling method is recommended for the assembling of 200 t steel-tube arch rib segments.