景观桥飞翼式钢拱肋施工支架设计与关键技术

Bracket Design and Key Technology for Construction of Flying-wing Steel Arch Rib of Landscape Bridge

摘要:

雄安白沟引河留通桥的飞翼式钢拱肋为装饰性构件，力学特征与常规梁拱组合桥的拱肋存在较大差异，且与主梁分离的布置方式对选择施工方案造成较大限制。通过全面论证、对比五种常用拱肋安装施工方法在结构受力影响、临时设施工程量、工期、施工难易程度、安全风险控制等方面的优缺点，选择对施工环境适应性最强的悬挑式支架法进行拱肋安装。在对各施工阶段支架受力与变形、主梁承载力对施工顺序影响分析的基础上，给出支架布置、施工通道预留、总体施工顺序、拱肋节段安装顺序、关键构造处理等完整解决方案，实施效果良好，可供类似景观桥梁施工参考。

Abstract:

The flying-wing steel arch ribs of Baigou Yin River Liutong Bridge in Xiongan are the decorative components. The mechanical characteristics are quite different from those of the conventional beam-arch composite bridge. The layout separated from the main beam imposes significant restrictions on the selection of construction schemes. By comprehensively demonstrating and comparing the advantages and disadvantages of five commonly used arch rib installation construction methods in terms of structural stress impact, temporary facility engineering quantity, construction period, construction difficulty, safety risk control, etc., the cantilever bracket method with the strongest adaptability to the construction environment is selected for arch rib installation. Based on the influences of bracket stress and deformation, and the bearing capacity of the main girder on the construction sequence during the different construction stages, the integral solution of bracket layout, reserved construction passageway, overall construction sequence, arch rib segment installation sequence and key structure treatment is given, and the implementation effect is good, which can be referred for the construction of similar landscape bridges.