摘要
马鞍山公铁两用长江大桥主航道桥为(112+392+2×1120+392+112)m三塔钢桁梁斜拉桥,钢桁梁采用全焊节段设计、制造,标准节段长28 m,节段最大重量约1800 t。边跨及辅助跨钢桁梁采用顶推架设,主跨钢桁梁节段采用架梁吊机原位起吊悬臂架设。为解决该桥岸上和滩地范围钢桁梁节段无法船运至起吊位置架设的难题,提出在Z4号墩附近设提升站,提升站与Z3号墩间设运梁栈桥(平行于施工栈桥),提升站提升钢桁梁节段至运梁栈桥上,再运输至起吊位置或存放于运梁栈桥上的方案。提升站采用立柱+纵梁+横梁的门式结构,通过横梁顶设置的4套提升系统和纵梁顶设置的2套纵移系统,实现了钢桁梁节段的同步提升、纵移和下放。运梁栈桥采用钢管桩+双层分配梁+焊接工字形主纵梁+钢轨的结构形式,对齐钢桁梁边桁双幅布置,标准跨度15 m,降低了防洪影响。钢桁梁节段转运时采用4台轮轨式运梁台车运输,通过液压油缸保持各支点反力恒定,保证了运输中钢桁梁和运梁栈桥受力安全。钢桁梁节段运输到存放位置后,运梁台车油缸卸落,通过钢桁梁节段支点处的垫梁支撑在运梁栈桥主纵梁两侧的存梁立柱上,台车驶离,实现了钢桁梁节段存放。
The main navigation channel bridge of Maanshan Changjiang River Rail-cum-Road Bridge is a three-pylon cable-stayed bridge with two main spans of 1120 m,two side spans of 392 m and two end spans of 112 m.The superstructure consists of steel trusses.Typical all-welded truss segment measured 28 m and the largest truss segment weighed about 1800 t.The trusses in the side and auxiliary spans were incrementally launched,while the trusses in the main spans were erected by cranes at the design locations,in a cantilever manner.However,the trusses over the river banks and shoal area could not be shipped to the hoisting locations,to address this issue,a lifting platform was installed near pier Z4,and truss delivering trestles were installed between the lifting platform and pier Z3(parallel to the construction trestle).During construction,the steel trusses were hoisted onto the delivering trestles and maneuvered to the hoisting locations or stored on the delivering trestles.The lifting platform is a portal-frame structure made of vertical posts,stringers and floor beams,there are four sets of hoisting systems installed on the top of the floor beams and two sets of longitudinal moving systems on the top of stringers,to achieve the parallel hoisting,longitudinal moving and lowering of the steel trusses.The two identical truss delivering trestles,which were installed corresponding to the side trusses,consist of steel pipe piles,two levels of spreaders,welded I stringers and steel rails,with typical span length of 15 m to minimize the disruption to flood release.Four wheeled trolleys were employed for truss delivery,where hydrocylinders permitted the reaction forces at supports to remain constant,so that the steel trusses could be safely delivered and the load bearing capacity of the truss delivering trestles could be guaranteed.Once the steel trusses reached the storage location,the hydrocylinders were deloaded,and the steel trusses were lowered onto the sleepers,in turn supported on the posts besides the stringers of the truss delivering trestles for truss storage,the trolleys moved away,and the storage of the steel trusses was achieved.
作者
沈大才
刘爱林
SHEN Dacai;LIU Ailin(China Railway Major Bridge Engineering Group Co.,Ltd.,Wuhan 430050,China;National Key Laboratory of Bridge Intelligent and Green Construction,Wuhan 430034,China)
出处
《桥梁建设》
EI
CSCD
北大核心
2023年第4期131-138,共8页
Bridge Construction
基金
中国中铁股份有限公司科技研究开发计划项目(2021-专项-03)。
关键词
公路铁路两用桥
斜拉桥
钢桁梁
滩地转运
提升站
运梁栈桥
运梁台车
存梁
rail-cum-road bridge
cable-stayed bridge
steel truss girder
transferring trusses over shoal area
lifting platform
truss delivering trestle
trolley
girder storge
