下承式钢管砼系杆拱桥施工风险控制

Construction Risk Control of Through Concrete-Filled Steel Tube Tied-Arch Bridge

摘要: 当城市桥梁面临桥面标高和桥下净空受限等问题时，下承式拱桥成为了更多城市的选择。本文以某下承式钢管砼系杆拱桥为例，介绍了大桥的总体结构设计；基于大桥建设条件，拟定合适的总体施工方案；详细介绍了大桥的拱脚、端横梁、系梁现浇及中横梁预制安装施工，钢管砼拱肋施工、吊杆安装和桥面板现浇等主要施工工序。最后对主要施工作业程序进行风险源辨识和安全风险估测，确定了施工过程中应加强控制的工序和风险。

Abstract: When urban bridges are faced with challenges such as limited deck elevation and clearance under the bridge, the through arch bridge has become the choice of more cities. In this paper, taking a through concrete-filled steel tube tied-arch bridge as an example, the overall structural design of the bridge is introduced. Based on the construction conditions of the bridge, formulate a suitable overall construction plan. The main construction procedures of the bridge are introduced in detail, such as the cast-in-situ construction of the arch feet, end beams, tie beams and the prefabrication and installation of the middle beams, the construction of the steel pipe concrete arch ribs, the installation of the suspender and the cast-in-situ construction of the bridge deck. Finally, the risk source identification and safety risk estimation are carried out for the main construction procedures, and the procedures and risks that should be strengthened in the construction process are determined.