近日 ,巫山长江公路大桥施工难度最大的主体拱桥顺利合龙 ,其长达 460m的净跨为目前世界同类桥梁之最。该桥由 2 2段拱肋组成 ,拱肋钢管直径达 1 2 2 0mm ,单件重量达 1 2 8t,中间由 2 0道“米形撑”支撑 ,吊装总量达 60 0 0t ,均为世界同类桥梁之最 ,最高吊装高度达 2 60m ,因 Recently, the main arch bridge with the most difficult construction in the Wushan Yangtze River Highway Bridge has been successfully closed. Its net span of 460m is the most similar to the world’s bridges. The bridge consists of 2 2 sections of arch ribs, arch rib pipe diameter of 1220mm, single piece weight of 128kg, the middle by 20 “rice-shaped brace” support, lifting a total of 60 0t, were The world’s most similar bridge, the highest hoisting height of 2 60m, due