Prestressed steel box concrete combination continuous beam bridge structure and construction technology

Abstract

The invention relates to a prestressed steel box concrete combination continuous beam bridge structure. The structure comprises bridge piers, main beams and a concrete bridge face; the bridge piers are connected with the main beams through bridge pier supports; the main beams are arranged between the adjacent bridge piers and are connected with the adjacent main beams through concrete and steel cables; the concrete bridge face is laid on the main beams; the main beams comprise a plurality of steel main beams which are arranged in parallel; the parallel steel main beams are connected through a plurality of steel cross beams perpendicular to the steel main beams; each steel main beam comprises a steel box structure, a steel web plate and a steel bottom plate; the steel bottom plates are connected with the steel box structures through the steel web plates; the lower ends of the steel box structures are connected with the bridge piers through the bridge pier supports; the upper ends of the steel box structures are connected with the concrete bridge face; the overall height of the steel main beams is smoothly decreased in a quadratic parabolic curve mode from the position above the bridge piers to the midspan. Compared with the prior art, the structure has the advantages of being large in rigidity, reasonable in structure, easy to construct, easy to maintain and the like.

Description

Technical field [0001] The invention relates to the field of bridges, in particular to a prestressed steel box concrete composite continuous beam bridge structure and construction technology Background technique [0002] A composite beam bridge is a bridge made of two materials in the same section, generally composed of steel and concrete. [0003] The existing steel box concrete composite continuous girder bridge adopts an open steel box, which is connected with the precast concrete deck through the shear nails on the upper part of the web and the cast-in-place concrete to prevent excessive tensile stress of the deck concrete in the negative moment area on the pier top. Cause cracking, set prestressed steel strands inside the precast bridge deck or apply external prestress in the negative bending moment area. Problems with existing technical solutions: [0004] 1. It is difficult to apply roof prestress and the degree of prestress is limited. Zhang Nan et al. pointed out in the li...

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Problems solved by technology

[0004] 1. It is difficult to apply prestressing on the roof, and the degree of prestressing is limited. Zhang Nan et al. pointed out in the analysis of the impact of external prestressing on the flexural performance of steel box concrete composite continuous girder bridges that prestressing construction tension needs to be stretched on the bridge deck. After the construction is completed, the tension is carried out in the closed space inside the box, but the construction space is limited, and the local stress of the anchor point is too large, which may easily lead to concrete cracking

[0005] 2. The prestress applied on the bottom plate is directly transmitted to the steel girder through the shear nails. The existing steel box concrete composite continuous girder bridge adopts an open steel box, through the shear nails on the upper web and the cast-in-place concrete and precast concrete bridge decks For connections, regardless of internal or external prestressing, the compressive stress always needs to be transmitted through the shear nails. Due to the live load, the shear stress of the shear nails changes greatly, which is extremely unfavorable for the fatigue resistance of welded steel structures

[0006] 3. The interior of the steel box is corroded and difficult to maintain. The general service life of the anti-corrosion coating inside the closed steel box is about 15 years. After the expiration, the construction space for re-painting is narrow and difficult to operate

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