大跨度外倾非对称式系杆拱桥施工控制研究

Study on Construction Control of Long-span Extroverted Asymmetric Bowstring Arch Bridge

成都市红星路南延线跨府河桥梁工程采用44 m+150 m+55 m的孔跨布置的曲线梁非对称外倾拱桥。钢箱拱和钢箱梁采用满堂支架法施工,全部完成拼装焊接后对吊杆和系杆进行张拉,完成体系转换,拆除钢箱拱和钢梁支架,施工过程比较复杂。因此,合理的体系转换是保证支架拆除过程中和拆除后结构安全的前提,并且决定了成桥下结构的应力状态和线形状态。采用桥梁专业软件Midas/Civil建立全桥有限元模型,根据实际施工过程进行仿真模拟计算分析。通过施工过程中现场实际数据与理论计算的数据进行对比分析,运用综合控制方法进行施工监控,对设计初期参数进行反复的修正和调整,最终桥梁结构的线形状态和应力状态满足设计要求。

The(44m+150m+55m)-span curved-beam asymmetric extroverted arch bridge is used in the Chengdu Hongxing Road South Extension Line Fuhe River Crossing Bridge Project.The steel box arch and steel box beam are constructed by the full framing method.The suspender and bowstring are tensioned after completion of all assembly and welding to carry out the system transition,and to dismantle the steel box arch and steel beam support.The construction process is more complex.Therefore,the reasonable system transition is the premise to guarantee the structure safety in the dismantling process of support,and to decide the stress state and the linear state of the structure in the finished bridge.The special bridge software of Midas/Civil is used to establish the finite element model of the whole bridge to carry out the simulation calculation and analysis according to the practical construction process.Through the comparison and analysis of the on-site real data and the theoretically calculated data,the integrated control method is utilized to carry out the construction control,and to carry out the repeating correction and adjustment of the initial parameters of the design.Finally,the linear state and the stress state of the bridge structure meet the design requirements.