Large prefabricated assembly cap beam with corbel structure and construction method

Abstract

The invention relates to a large prefabricated assembly cap beam with a corbel structure and a construction method. The cap beam consists of members at two outer hanging type cantilever sections and a member in a middle section, wherein the assembly junction surfaces of the two sides of the member in the middle section are respectively provided with a corbel, and laser beam relative position calibrating receiving points are arranged on four corner point positions of the assembly crossing surfaces; a joint part of the member in the middle section and a bridge pier is provided with a vertical connector and a relative position calibrating transmitting point; a connecting part of each of the members at the two outer hanging type cantilever sections and the member in the middle section is in a trapezoid shape, and laser relative position calibrating transmitting points are arranged on the four corner points of the junction surfaces; both ends of a prestressed reinforcement are tensioned by a back tension method to connect into a whole. The large prefabricated assembly cap beam has the advantages that compared with the structure of arranging small shear keys on a plane, the corbel structure has stronger anti-shear capability; the prefabrication construction is convenient, and the refining treatment time of special parts in a member prefabrication process is favorably shortened; in a quantitative production step, the working efficiency is greatly improved, the construction risk is decreased, and a large amount of labor and material resources are reduced.

Description

technical field [0001] The invention relates to a large prefabricated assembled cover beam, in particular to a large prefabricated assembled cover beam adopting a corbel shear structure and a construction method thereof. Background technique [0002] Due to the characteristics of wet work on site, the construction of concrete bridges requires a large number of formwork and support systems. Under adverse construction conditions, it is not feasible to erect full-scale supports. At the same time, the construction of the cover beam is a high-altitude operation, and a large amount of concrete is poured on site, which poses a high construction risk. The method of prefabricated and assembled cover beams can speed up the construction speed, reduce the cost, and ensure the quality. At the same time, it is very economical considering the scale effect. [0003] The premise of using integral prefabricated cover beams is that the width of the bridge deck should not be too wide. However,...

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Problems solved by technology

[0003] The premise of using integral prefabricated cover beams is that the width of the bridge deck should not be too wide. However, for large cantilever cover beams, the overall prefabrication of cover beams does not meet the requirements of transportation and hoisting. At this time, segmental prefabricated cover beam technology must be used.

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