Superposition beam structure for prefabricated bridge surface plate and steel beam close combination

Abstract

A prefabricated bridge deck and steel beam tight coupling composite beam structure includes precast concrete bridge deck assembly and steel beam assembly. Said precast concrete bridge deck assembly has precast concrete bridge deck, end surface loop type steel reinforcement, bottom surface shear resistant slot, and bottom surface shear resistant unit. Said steel beam assembly has upright steel beam, steel beam top flange plate, integrated steel plate side formwork, shear resistant unit, integrated steel mesh end mould, said steel beam top flange plate shear resistant unit intersect polymerizing with said bridge slab bottom surface shear resistant unit..Said invention is suitable for prefabricated bridge deck with overhung tight coupling with steel beam, but also capable of having tightwire hole, wherein capable of setting bridge floor prestressed cable tensile in factory for prefabrication.

Description

technical field [0001] The invention relates to a composite beam structure for bridges, in particular to a composite steel-concrete composite beam structure which is jointly stressed through the combination of a shear device on a steel beam and a concrete bridge deck, and in particular to a composite beam structure with a cantilever The composite beam structure of the prefabricated bridge deck and steel girder compact structure. Background technique [0002] In the composite steel-concrete composite beam, because the additional internal force caused by the shrinkage and creep of the pure cast-in-place concrete bridge deck is relatively large, and a large number of formwork is required, the precast concrete bridge deck technology is widely used. Precast concrete bridge deck technology is to erect the precast concrete bridge deck on the steel girder, pour a small amount of concrete on site to make the shear device on the steel girder, the shear groove on the precast concrete b...

AI Technical Summary

Problems solved by technology

But the disadvantages of this technology are: the connection between the bridge deck and the cantilever slab depends on a short section of concrete poured later, and the connection strength is poor; Deformation; temporary support is required during construction, which increases construction costs

[0004] 2) Two types of prefabricated bridge deck technologies with cantilevers have been developed abroad, but both have certain defects and limitations

There are two obvious defects in this prior art: a) the shear force transmission between the concrete bridge deck and the steel girder is discontinuous; b) in the non-synthetic area, there is a weak line Void zone 22, where corrosion of steel beams is prone to occur and difficult to repair and maintain

Although this technology can overcome the two defects of the aforementioned prior art, it has produced other defects, such as: a) the construction and quality control of injection cement mortar can only be carried out under invisible conditions; During the installation of the bridge deck, the slab section at the shear groove is relatively weak and has stress concentration; c) the sealing requirements are very high; d) there is no steel connection between the precast concrete bridge deck blocks

[0007] In addition, no technology has been developed at home and abroad that can perform prestressed steel cable tensioning on long-span concrete bridge decks in the prefabrication field, so as to avoid the additional internal force of steel components caused by on-site prestressed steel cable tensioning

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