Cover beam high-durability prefabricated formwork and cover beam

Abstract

The invention discloses a cover beam high-durability prefabricated formwork which comprises a shell with the top end open and the shape consistent with that of a cover beam. The wall thicknesses of all the wall surfaces of the shell are consistent; a rib assembly is arranged on each inner wall surface of the shell; each rib assembly comprises a plurality of first reinforcing ribs and second reinforcing ribs which are vertically crossed to form a grid shape; the heights of the first reinforcing ribs and the second reinforcing ribs protruding out of the corresponding inner wall surface of the shell are consistent; a plurality of supporting steel bars are embedded in the first reinforcing ribs and the second reinforcing ribs and extend in the direction perpendicular to the inner wall face of the shell where the supporting steel bars are located. The invention further discloses the cover beam. Compared with an existing common concrete cover beam, the shell made of the ultra-high-performance concrete has the advantages that the strength and the deicing salt corrosion resistance are improved, the end faces are not prone to falling off, and therefore the problem that the durability of the structure is damaged is solved.

Description

technical field [0001] The invention belongs to the technical field of bridges, and in particular relates to a high-durability prefabricated formwork shell and a cover beam. Background technique [0002] The cover beam refers to the load for supporting, distributing and transferring the upper structure. It is a beam set on the top of the bent pile pier. Its main function is to support the upper structure of the bridge and transfer all the load to the lower structure. [0003] At present, the cover beam is usually made of ordinary concrete pouring, and a steel cage is set inside it. The steel cage is a cage-like structure welded by several steel bars. The appearance structure of the cover beam is as follows figure 1 shown. In the production process of the cover beam, two methods are usually used. The first is to weld the steel cage first, then hoist the steel cage to the casting mold of the cover beam and fix it, and finally pour concrete into the casting mold to form a cove...

AI Technical Summary

Problems solved by technology

[0004] However, in the above two methods, due to the error in the process of making the steel cage (cutting, welding) and the positioning error in the hoisting process, there will be errors in the position of the steel cage in the casting mold, and the existence of these errors will eventually lead to forming Afterwards, it is difficult to control the thickness of the protective layer of the reinforcement in the cover beam, and the thickness of the local reinforcement cover is lower than the design value, or even exposed. The thickness of the reinforcement cover refers to the distance between the outermost reinforcement of the reinforcement cage and the corresponding concrete surface of the cover beam.

[0005] Under the action of rainwater, freeze-thaw, deicing salt, etc., the concrete spalling of each end face of the cover beam will be caused. The insufficient thickness of the protective layer of the steel bar will easily cause the steel bar corrosion of the cover beam. The spalling of the concrete and the corrosion of the steel bar will induce each other, causing the durability damage of the reinforced concrete structure.

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