摘要
G3铜陵长江公铁大桥主桥为(127.5+131+988+131+127.5)m斜拉-悬索协作体系桥,主梁为两主桁钢桁梁结构,采用三角形桁式,桁高13.5 m、桁宽35.0 m。根据主桥总体施工计划,主桥南、北岸钢梁采用1台1600 t架梁吊机(重约840 t)架设,在南岸钢梁Z32Z33架设完成后,需通过2艘1000 t浮吊将架梁吊机转场至北岸,北岸钢梁再利用1600 t架梁吊机进行架设。为保证1600 t架梁吊机顺利转场,在架梁吊机上增设牛腿并拆除架梁吊机部分构件,使其满足浮吊吊重要求,并通过建模计算得到架梁吊机重心位置,通过4根不同长度软吊带使浮吊吊钩与架梁吊机重心线重合。通过研究浮吊和运输船进场顺序、船舶站位及抛锚方案,解决了船舶抛锚空间交叉状态下的定位难题。结合BIM信息化监测平台对架梁吊机吊装过程中的倾角、转动等姿态进行动态监测,确保2艘浮吊之间纵、横向相对距离偏差均不超过100 cm,浮吊纵向绞锚水平移动距离偏差不超过100 cm,2艘浮吊在竖向下放、提升时竖向高差不超过50 cm,使架梁吊机安全转场至北岸。
Carrying a section of G3 expressway,the Tongling Changjiang River Rail-cum-Road Bridge is a hybrid cable-stayed suspension bridge with a main span of 988 m,two side spans of 131 m and two side spans of 127.5 m.The stiffening girder consists of two planes of Warren trusses that measure 13.5 m deep and are 35.0 m apart along the bridge width.The construction of the stiffening girder started from the south bank,using a 1600 t-capacity girder erection crane(weighing about 840 t),once the girder segment Z32Z33 was placed into position,the girder erection crane had to be relocated at the north bank by using two 1000 t-capacity barge cranes to continue the construction of the stiffening girder.To ensure a smooth relocation,the 1600 t-capacity girder erection crane was added with corbels,but shook off pieces of components to suit the loading capacity of the barge cranes.Numerical modelling was conducted to find the gravity center of the girder erection crane.Four soft riggings of different lengths were deployed to keep the lifting lugs of the barge cranes overlap with the gravity center line of the girder erection crane.The deployment sequence and locations of the barges as well as the way of barge mooring were studied to facilitate the positioning of barges under the restriction of crossing anchors.The inclination and rotation of the girder erection crane during the relocation process was monitored in a BIM platform,to guarantee the bias of the longitudinal and transverse distances of the two barge cranes does not exceed 100 cm,and the bias of the horizontal moving distance of longitudinal anchors of the barge cranes does not exceed 100 cm.Additionally,the vertical distance between the two barge cranes during lowering should not be over 50 cm,to ensure that the girder erection crane be safely relocated at the north bank.
作者
王青云
何明辉
WANG Qingyun;HE Minghui(China Railway Major Bridge Engineering Group Co.,Ltd.,Wuhan 430050,China)
出处
《桥梁建设》
EI
CSCD
北大核心
2024年第6期140-145,共6页
Bridge Construction
基金
中国中铁股份有限公司科技研究开发计划课题(2022-专项-03)。
关键词
公路铁路两用桥
斜拉-悬索协作体系桥
钢桁梁
架梁吊机
浮吊
转场施工
动态监测
施工技术
rail-cum-road bridge
hybrid cable-stayed suspension system
steel truss
girder erection crane
barge crane
location transfer
dynamic monitoring
construction technique
