摘要
宜昌伍家岗长江大桥主桥为主跨1 160 m的双塔钢箱梁悬索桥,主梁为整体式流线型扁平钢箱梁,梁宽34.7 m。钢箱梁共77个节段,南、北两岸节段对称布置,采用双悬臂架设方案施工。根据地形及水位情况,塔柱附近7个钢箱梁节段无法直接水运至指定位置进行架设,采用存梁法架设;其余钢箱梁节段直接由水面运输船垂直起吊架设。塔柱附近7个钢箱梁施工时,先通过荡移系统将钢箱梁节段由低位(水面)荡移至高位(存梁栈桥),再通过滑移系统将钢箱梁节段牵引至指定位置存梁。7个钢箱梁节段存梁后,利用2台缆载吊机由跨中向桥塔方向进行双悬臂架设,直至全桥合龙。主桥上部结构钢箱梁架设历时2.5个月,架设精度满足规范要求。
The main bridge of Wujiagang Changjiang River Bridge in Yichang is a two-tower suspension bridge with a main span of 1 160 m.The stiffening girder consists of integral streamlined flat steel box girders measuring 34.7 m wide,totally 77 segments.The steel box girder segments were erected by the balanced cantilever assembly method,symmetrically progressed on the two river shores.Limited by the topographical conditions and variation of water level,the seven segments at each tower could not be directly shipped to the specific locations for erection,as a result,they were stored in a specific place on site prior to erection.The remaining steel box girder segments were directly shipped to the specified locations and vertically hoisted.During construction,the seven segments at each tower were swung from a lower elevation(water level) to a higher elevation(onto the trestle for storage) by a swing system,then,dragged to be stored in the specified locations by a sliding system.Afterwards,two lifting cranes mounted on the main cables were employed to erect the segments from midspan towards the two towers,with two cantilevers stretching till the closure of the stiffening girder.The erection of the stiffening girder lasted 2.5 months,with qualified erection accuracy.
作者
孙琦
李辉
林飞杨
SUN Qi;LI Hui;LIN Fei-yang(CCCC Second Harbor Engineering Co.,Ltd.,Wuhan 430040,China)
出处
《桥梁建设》
EI
CSCD
北大核心
2022年第5期142-148,共7页
Bridge Construction
关键词
悬索桥
钢箱梁
双悬臂架设
存梁法
荡移
施工技术
suspension bridge
steel box girder
balanced cantilever erection
girder on-site storage
swing method
construction technique
