Prefabricated type external prestressed steel truss combination beam structure and construction method thereof

Abstract

The invention discloses a prefabricated type external prestressed steel truss combination beam structure and a construction method thereof. The steel truss combination beam structure comprises a concrete slab, a steel girder top plate and a steel girder bottom plate which are arranged sequentially from top to bottom, a truss mechanism and a supporting mechanism are arranged between the steep girder top plate and the steel girder bottom plate, the truss mechanism comprises two end steel chord members and multiple inclined steel chord members, and prestressed reinforcements are arranged in the supporting mechanism. A construction process for any one bridge segment in the construction method comprises following steps: step one, preparation before construction; step two, assembling and hoisting of the steel truss structure; step three, mounting of the concrete slab; step four, cast-in-place grouting of concrete and laying of longitudinal reinforcements; step five, mounting of deflecting plates and the prestressed reinforcements and multiple times of repeating of steps one to three until all construction process of the constructed bridge is completed. The construction is simplified, andthe problems of fatigue of shear connectors of a steel-concrete combination beam and stress of a negative moment region of the steel-concrete combination beam are solved.

Description

technical field [0001] The invention belongs to the technical field of bridge construction, and in particular relates to an assembled externally prestressed steel truss composite beam structure and a construction method thereof. Background technique [0002] The connection between concrete and steel beams in steel-concrete composite beams is mainly realized through shear connectors on the steel beams, but the shear connectors in the conventional sense have the problem of fatigue failure, and the failure of shear connectors The problem will expand from local to the entire composite beam, and in severe cases, it may also lead to the replacement of the steel main beam. [0003] Steel-concrete composite beams can give full play to the tensile properties of steel and the compressive properties of concrete, but in the negative moment zone of continuous beams, the phenomenon of steel compression and concrete slab tension cannot be avoided. When combining the advantages of beams, t...

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Problems solved by technology

[0003] Steel-concrete composite beams can give full play to the tensile properties of steel and the compressive properties of concrete, but in the negative moment area of ​​continuous beams, the phenomenon of steel compression and concrete slab tension cannot be avoided. When combining the advantages of beams, the disadvantages of both will be exposed

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