大跨度钢桁梁悬臂架设及柔性拱拱脚合龙施工关键技术

京沪高速铁路黄河特大桥主桥为下承式、等高度、连续、刚性梁柔性拱结构,文章详细介绍了主桥在悬臂架设及柔性拱安装中采用的竖、横、纵三维快速同步调整钢桁梁和拱脚合龙等核心技术.上述施工技术的采用确保了两桁式四线铁路钢桁梁桥悬臂拼装过程中的结构线形和施工精度精确符合设计要求,实现了柔性拱拱脚的无应力合龙,为结构受力符合设计计算模型起到了技术保障的作用,可供类似结构的桥梁施工参考.

Key Construction Technique of Cantilever Erection for Steel Truss Girder With Long-Span and Spring Closure of Flexible Arch

The main bridge of the Yellow River bridge is a through bridge with equal altitudes, continuous rigid girder and flexible arch structure. During the construction of cantilever and flexible arch, the core technologies of fast synchronization 3D （vertical, lateral and longitudinal） adjustment for steel truss girders and spring closure are introduced in this paper. Using these technologies, the cantilever structure alignment and construction accuracy are satisfied, and unstressed closure of flexible arch sprind is achieved. These technologies provide supports for structure stress according with the design computation model and could be taken as reference for similar bridge construction.