Steel-Concrete Mixed Continuous Box Girder Bridge Deck Joint Structure and Construction Method

Abstract

The invention discloses a steel-concrete hybrid continuous box girder bridge deck joint structure. The box girder includes a flange plate, a web and a bottom plate, including a vertical bending moment area located at the junction of the positive and negative bending moment areas of the box girder along the direction perpendicular to the extension direction of the box girder. The pressure-bearing plate arranged on the flange plate, the cover plate flush with the flange plate in the positive moment area of ​​the box girder near the junction of the positive and negative moment areas, and the concrete above the flange plate in the positive moment area of ​​the box girder The bridge deck and the steel bridge deck in the negative moment zone above the flange plate in the negative moment zone of the box girder. In the negative moment area of ​​the present invention, steel structure bridge decks are used to replace traditional concrete structure bridge decks, and on the basis of no need to apply prestressing, fulcrum jacking and other related measures, it solves the problem of negative moment bridge decks under operating loads. cracking problem.

Description

technical field [0001] The invention belongs to the technical field of bridge structures, and in particular relates to a multi-span steel-concrete mixed continuous box girder deck joint structure and a construction method suitable for ordinary highway bridges and urban overpass bridges. Background technique [0002] In recent years, with the rapid development of highway and municipal construction, steel-concrete composite continuous box girder, as a convenient main beam structure, has been widely used. The conventional steel-concrete composite structure continuous box girder is a structure in which the steel girder and the concrete slab are combined into a whole through shear connectors and are jointly stressed. The steel girder participates in tension as the lower structure, and the concrete bridge deck acts as the upper structure. Participating in the compression action, making full use of the advantages of light, high strength and easy erection of the lower steel beam, an...

AI Technical Summary

Problems solved by technology

After research and investigation, it is concluded that even if various technical measures are taken to avoid the cracking problem of the concrete bridge deck in the negative bending moment area, the cost is high and the construction is difficult

[0004] The existing steel-concrete composite structure continuous box girder has deficiencies. The fundamental reason is that the negative moment area of ​​the middle fulcrum uses a concrete bridge deck. If there is no large compressive stress reserve during the construction process (and when the bridge is completed), the operation Under load, a large tensile stress will appear, which will lead to cracking

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