Hybrid composite beam steel-concrete combined section and mounting method thereof

Abstract

The invention discloses a hybrid composite beam steel-concrete combined section and a mounting method thereof. The combined section comprises a concrete beam, a composite beam, a bridge deck slab anda cast-in-place bridge deck slab, and a square frame is composed of a pair of parallel steel side main beams, small longitudinal beams arranged in the longitudinal direction of a bridge and side crossbeams orthogonal to the steel side main beams and the small longitudinal beams; the bridge deck slab is paved on the square frame, the cast-in-place bridge deck slab is cast, the e steel side main beams and the small longitudinal beams of the square frame are inserted into the concrete beam, and are cast to form an integral body, and the integral body is different from a traditional I-shaped steel edge main beam. The upper end of a main beam web on the lower side of a first top plate of the steel edge main beam can be directly in butt fusion welding with a cable beam anchoring device plate, so reliable strength and excellent anti-fatigue performance are achieved; transverse prestressed tendons go deep into the concrete beam along the steel edge main beams to perform prestressed tensioningon the steel-concrete combined section; and the concrete beam and the square frame organically form the integral body, so that manual errors are effectively reduced, the construction efficiency is improved, and the manufacturing and mounting cost is reduced.

Description

technical field [0001] The invention relates to a bridge construction technology, in particular to a steel-concrete combined section of a hybrid composite beam and an installation method thereof. Background technique [0002] Steel-concrete composite girder bridges use concrete to bear most of the main girder pressure, and the concrete slab deck is more economical than the orthotropic slab steel deck. The main girders, beams and prefabricated slabs of the composite girder bridge can all be small components, which are easy to transport and install. The steel girders are bolted on site, and the precast concrete slabs are connected by on-site wet joints. Compared with the all-concrete main girder, the lifting equipment is relatively small and has no dry joints; compared with the all-steel main girder cable-stayed bridge, it uses less steel and has lower requirements on transportation conditions. With the continuous innovation and development of domestic bridge technology, the ...

AI Technical Summary

Problems solved by technology

[0003] The conventional steel-concrete combination section is the transition section between the steel beam and the concrete beam structure, usually including the steel beam body, the shear studs or shear members welded on the steel beam, the core concrete filled around the steel beam and the longitudinal The prestressed steel tendons running through the steel-concrete joint section and the transition section between the steel beam and the concrete beam, etc., compared with the conventional steel-concrete joint section, the joint section of the composite beam main beam and the concrete main beam (hereinafter referred to as "hybrid composite beam") The structure of the steel-concrete joint section") is more special and complex, its stress state and force transmission mechanism are not clear, and its mechanical behavior is fuzzy. There are problems such as contact and constitutive equations in numerical simulation calculations, which are difficult

In the actual construction process of the conventional steel-concrete joint section, the concrete is usually poured after the steel-concrete joint section is positioned, and the precision adjustment of the steel-concrete joint section is carried out on the assembled tire frame. However, due to the hybrid composite beam steel Multiple steel beams need to be laid in the mixed joint section. Each steel beam has a complex structure, larger weight and volume than conventional ones, and the installation space is relatively narrow. The operation is difficult and there is a problem that it is difficult to adjust the positioning accuracy.

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