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济南黄河公铁两用桥全长128m+3×180m+128m,是石济铁路客运专线工程横跨黄河的重点项目,为我国公铁两用桥上首次采用刚性悬索加劲弦连续钢桁梁结构。提出了3桁5跨的“钢桁梁带加劲弦顶推”刚性悬索加劲弦钢桁架梁桥施工新技术,给出了顶推的关键步骤,采用MIDAS-Civil软件对钢桁梁带加劲弦顶推施工全过程进行了仿真数值分析,解决了带弦顶推最大悬臂工况、加劲弦合龙等系列技术难题,验证了钢桁梁带加劲弦顶推施工新技术的安全性和可靠性。同时提出了落梁后吊杆安装的两个技术方案,通过数值模拟和综合考量,明确最优的技术方案。所提出的钢桁梁带加劲弦顶推施工新技术为我国类似的跨江、跨河、跨高速大跨度桥梁工程施工提供了参考依据。
The total length of Jinan Yellow River Rail-cum-Road Bridge is 128m + 3 × 180m + 128m, which is the key project across the Yellow River of the Shi-Ji Railway Passenger Dedicated Line Project. It is the first time to adopt rigid suspension stiffening chord continuous steel truss girder structure. This paper presents a new technology for the construction of 3-girder 5-span “steel truss girder with stiffened chord pushing” rigid suspension cable stiffened chord steel truss girder bridge. The key steps of jacking are given. Using MIDAS-Civil software, The simulation of the whole process of the construction with the stiffened chin is carried out, the numerical simulation is carried out, the series of technical problems such as the maximum cantilever working condition of the chord jacking, reliability. At the same time, two technical solutions for boom installation after falling beam are put forward. Through numerical simulation and comprehensive consideration, the optimal technical solution is defined. The proposed new technology of steel truss girder with stiffening chute jacking provides a reference for the similar construction of long-span bridges across the river, across the river and across the country.