Ultra-high performance concrete filled steel tube box-shaped arch rib and construction method thereof: Fid-Bau Portal

Ultra-high performance concrete filled steel tube box-shaped arch rib and construction method thereof

LIU JIANG / MA ZHIYUAN / LIU YONGJIAN / LYU YI / MA YINPING

The invention relates to the field of bridge design and construction, in particular to an ultra-high-performance concrete filled steel tube box-shaped arch rib and a construction method thereof.The box-shaped arch rib comprises a plurality of box-shaped units fixed to one another, and each box-shaped unit comprises a transverse partition plate, an ultra-high-performance concrete filled steel tube standard unit and an ultra-high-performance concrete filled steel tube special-shaped node rod unit; the ultra-high performance concrete filled steel tube standard units and the ultra-high performance concrete filled steel tube special-shaped node rod units are filled with UPHC and a plurality of PBL stiffening ribs. The structural form breaks through the section type of a traditional concrete filled steel tube arch rib, the ultra-high performance concrete filled steel tube box-shaped arch rib filled with UHPC and provided with PBL connecting pieces is provided, the unitized design is adopted, the number of weld joints of steel tube joints is reduced, the structure is light, factory prefabrication is achieved, construction is rapid, and the box-shaped arch rib can be flexibly applied to large-span arch bridge design under the terrain and environment.

本发明涉及桥梁设计及施工领域，具体涉及一种超高性能钢管混凝土箱形拱肋及其施工方法，该箱形拱肋包括相互固定的若干个箱型单元，箱型单元包括横隔板、超高性能钢管混凝土标准单元、超高性能钢管混凝土异形节点杆单元，超高性能钢管混凝土标准单元、超高性能钢管混凝土异形节点杆单元内部均填充UPHC和多个PBL加劲肋。本发明结构形式突破传统钢管混凝土拱肋截面类型，提出了内填UHPC并设置PBL连接件的超高性能钢管混凝土箱形拱肋，采用单元化设计，减少了钢管节点的焊缝数量，构造轻便，工厂预制，施工快速，可灵活应用在地形、环境下的大跨径拱桥设计上。

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