摘要
跨襄阳北编组站大桥为转体斜拉桥,转体时梁面以上塔高73 m,最大转体重量32000 t,为提高转体过程中桥梁的抗倾覆稳定性,设计了基于齿轮齿轨传动的多点支撑转体系统。转体系统主要由转动系统(中心球铰、常规撑脚、滑道、齿条)及辅助支撑系统(驱动承力支腿、电气控制系统)组成。中心球铰设计最大承载28000 t,6个驱动承力支腿总设计承载6000 t,通过6个驱动承力支腿的齿轮啮合齿轨实现桥梁转体。该转体系统通过降低中心球铰承受的竖向荷载,改善了承台及桩基的受力状态;转体过程中6个驱动承力支腿实时与滑道保持接触状态,提高了转体桥梁的抗倾覆稳定性。对转动结构和辅助支撑系统受力进行计算,结果表明该转体系统受力满足要求。工程实践验证了该转体系统的可靠性。
The cable-stayed bridge crossing the Xiangyang North Marshalling Station was constructed by a rotation method.When the rotation construction started,the pylon had been completed and rose 73 m above deck,and the structure needed to be rotated weighted at a maximum of 32000 t.To improve the overturning stability of the bridge in the rotation process,a multi-point-support swivel system based on rack-and-pinion steering was designed,which mainly consists of a swivel system(a central spherical hinge,conventional stands,sliding rails and racks)and an auxiliary supporting system(driving and load bearing legs and an electrical control system).The central spherical hinge has a maximum load bearing capacity of 28000 t.With a design total load bearing capacity of 6000 t,the six driving and load-bearing legs were fitted with a rack-and-pinion steering system that could drive the bridge structure to rotate.The swivel system can lower the vertical loads on the central spherical hinge and improve the loading conditions of the pile cap and piles.The load bearing behaviors of the structures rotated and the auxiliary supporting system were computed and proved reaching the required level.The engineering practice verified the reliability of the swivel system proposed.
作者
梅慧浩
MEI Hui-hao(China Railway 11th Bureau Group Co.,Ltd.,Wuhan 430061,China)
出处
《世界桥梁》
北大核心
2023年第3期36-42,共7页
World Bridges
基金
国家自然科学基金项目(52078084)
国家重点研发计划项目(2021YFF0501004)
中国铁建股份有限公司科技研究开发计划项目(2020-B02)。
关键词
斜拉桥
转体施工
转体系统设计
多点支撑
驱动承力支腿
齿轮齿轨传动
工程应用
cable-stayed bridge
rotation construction
swivel system design
mult-point support
driving and load-bearing leg
rack-and-pinion steering
engineering application
