Structure for preventing concrete-filled steel tube arch bridge arch foot steel tube outer wrapped concrete from cracking

Abstract

The invention discloses a structure for preventing concrete-filled steel tube arch bridge arch foot steel tube outer wrapped concrete from cracking. An exposed arch rib section (D) is composed of a conventional exposed arch rib section (B), chord member shear nails (15), a bearing plate (16), chord member inner side stiffening rings (17), bearing plate stiffening rib plates (18), an annular sealing steel belt (19) and a rubber water stop strip (20). Shear nails (15) are welded to the lowermost ends of arch rib upper chords (1) and arch rib lower chords (2) in the exposed arch rib sections (D)and the outer surfaces of the bearing plate (16), embedded section upper chords (3) and embedded section lower chords (4). The defect that in the prior art, due to the fact that the side resistance between the outer pipe wall of an arch rib steel tube and concrete is too large, arch foot steel outer wrapped concrete cracks is overcome, and the advantages that it can be guaranteed that an arch footof an arch bridge made of concrete-filled steel tubes has enough durability and safety and the service life are achieved.

Description

technical field [0001] The invention relates to the technical field of bridges, and more specifically relates to a structure for avoiding cracking of the steel pipe outsourcing concrete of the arch foot and arch rib of a steel pipe concrete arch bridge. Background technique [0002] CFST has the advantages of light material, high strength, large bearing capacity, and convenient construction and installation. It is widely used in the three structural systems of arch bridges, such as figure 1 , figure 2 and image 3 shown. [0003] In order to reliably connect the arch seat and the arch-rib steel pipe, the conventional pre-embedded arch-rib steel pipe is generally buried in the concrete of the first poured section of the arch seat, and then the conventional pre-embedded arch-rib steel pipe and the exposed arch-rib steel pipe are connected by using the chord joint steel pipe. Then use the abutment to post-cast the hinge section concrete for consolidation, such as Figure 4...

AI Technical Summary

Problems solved by technology

[0005] Once the cracks are too large, water and water vapor in nature will penetrate into the concrete along the cracks, causing internal steel bars and steel pipes to corrode, reducing the structural bearing capacity, durability and service life, and deep cracks will even destroy the integrity of the abutment , change the stress mechanism of the abutment concrete, and even cause the concrete to fall off and fail, affecting the structural safety

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