96m钢-混组合桁架梁桥异位成型及转体施工技术

新建安九铁路庐山特大桥采用1孔96 m钢-混组合桁架梁结构跨越瑞九铁路线。根据桥梁结构特点及施工条件,该桥采用“异位成型、转体就位”的方案施工。在瑞九铁路线侧搭设组合支撑体系,在组合支撑体系上进行钢桁梁的拼装及混凝土槽形梁现浇施工;在Y197号墩墩顶设置固定端转轴、Y198号墩侧设置转体滑道和牵引设备,以Y197号墩中心为圆心、96 m为半径,将梁体转动16°至设计位置;转体后,按照单墩同步、两墩交替循环的方式落梁2429 mm至设计标高,完成钢-混组合桁架梁桥施工。

Off-Site Formation and Rotation Construction of 96 m Steel-Concrete Composite Truss Girder Bridge

The Lushan Bridge on the newly-built Anqing-Jiujiang Railway has a 96 m-long span of steel-concrete composite truss girder structure that crosses the Ruichang-Jiujiang Railway.Based on the structural characteristics of the bridge and the construction condition,the construction scheme of off-site formation and on-site rotation into position was used.A composite support system was installed on the Ruichang-Jiujiang Railway side,on which the steel truss girder was assembled and the concrete trough beam was cast.The swivel connected to the fixed end was installed on the top of pier Y197,Sliding rails and traction equipment were installed on the side of pier Y198,then,the body of the girder was rotated 16°to its design position,by taking the center of the pier Y197 as the circle center and moving with a radius of 96 m.After the rotation,the girder was lowered by 2429 mm to the design elevation by the way of synchronized move of individual piers and altered move of two piers,to complete the construction of steel-concrete composite truss girder.