Assembly type tie bar rectangular concrete filled steel tube truss composite beam and construction method thereof: Fid-Bau Portal

Assembly type tie bar rectangular concrete filled steel tube truss composite beam and construction method thereof

DING FAXING / YIN YIXIANG / LYU FEI / WANG LIPING / YU YUJIE

The invention discloses an assembly type tie bar rectangular concrete filled steel tube truss composite beam and a construction method thereof. The assembly type tie bar rectangular concrete filled steel tube truss composite beam comprises tie bar rectangular steel tube trusses, concrete poured into main chord tubes and a bridge deck. The tie bar rectangular steel tube truss is formed by welding three sections of tie bar rectangular steel pipe trusses, each section of tie bar rectangular steel pipe truss is formed by welding a main chord pipe, an inclined web pipe, a grid type connection pipe and variable cross-section I-shaped steel, and the bridge deck is formed by assembling prefabricated solid concrete slabs. The bridge deck slab and the assembly type tie bar rectangular steel tube trusses are connected into a whole through the perforated stiffening ribs. Compared with a traditional prestressed box girder, the prestressed box girder is large in rigidity, good in ductility, reasonable in stress, high in assembly degree and convenient to construct, the defect that the steel pipe constraint effect is insufficient is overcome, bonding between the steel pipe and concrete is enhanced, the span of the girder is increased, the number of bridge piers is reduced, and economic benefits are improved.

一种装配式拉筋矩形钢管混凝土桁架组合梁及其施工方法，包括拉筋矩形钢管桁架，灌注在主弦管的混凝土以及桥面板。所述拉筋矩形钢管桁架由三节段拉筋矩形钢管桁架焊接而成，所述分段拉筋矩形钢管桁架由主弦管、斜腹管、网格型联系管以及变截面工字钢焊接组成，所述桥面板为预制实心混凝土板装配而成，所述桥面板与装配式拉筋矩形钢管桁架通过开孔加劲肋连接为整体。本发明与传统的预应力箱梁相比，刚度大、延性好、受力合理、装配化程度高、施工方便，弥补了钢管约束效果不足，增强了钢管与混凝土之间粘结，增加了梁的跨度，减少了桥墩的数量，提高了经济效益。

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