Prefabricated prestressed high performance concrete composite beam and its construction method based on dry connection

Abstract

A prefabricated prestressed high-performance concrete composite beam based on dry connection, including: I-beam, with a number of round holes pierced on its web along the length direction; split concrete strips, arranged on the web of I-beam On both sides of the plate, and between the upper and lower flanges, there are through holes coaxial with the round hole, wherein at least one side of the through hole is a gradually widening hole, and the gradually widening hole refers to its aperture along the The web increases linearly toward the outside; the prefabricated concrete connecting piece is consistent with the shape of the gradually widening hole, and is at least filled in the gradually widening hole on one side, and is provided with the same The reserved hole of the shaft; the bolt connector is set in the reserved hole and the round hole, and the I-beam, the split concrete strip and the prefabricated concrete connector are connected into one; the prestressed tendon is arranged in the split Concrete strip, and consistent with the length direction of the I-beam. The invention completely adopts dry connection, and all the components are prefabricated, which greatly improves the production efficiency.

Description

technical field [0001] The invention belongs to the technical field of construction, and in particular relates to a prefabricated prestressed high-performance concrete composite beam based on dry connection and a construction method. Background technique [0002] In the research process of prestressed steel-concrete composite beam, it is difficult to ensure that all the prestress is applied to the concrete of the lower flange accurately, and the section steel and the concrete of the upper flange always bear part of the prestress. Simply separating the concrete and the profiled steel and applying prestress to the lower flange of the concrete on one side will not only cause the concrete of the compression flange to bear part of the prestress, but also cause the prestressed concrete to be under tension due to large bias before it is assembled. Cracks occur on one side or even the entire component is unstable and damaged. Therefore, a simple and effective prestressed steel-conc...

AI Technical Summary

Problems solved by technology

[0002] In the research process of prestressed steel-concrete composite beams, it is difficult to ensure that all the prestress is accurately applied to the concrete of the lower flange, and the steel and the concrete of the upper flange will always bear part of the prestress

Simply separating the concrete and the section steel, and applying prestress to the lower concrete flange on one side will not only cause the concrete of the compression flange to bear part of the prestress, but also the prestressed concrete will be under tension due to the large bias before it is assembled. Cracks appear on one side or even the whole component becomes unstable and damaged

Therefore, a simple and effective prestressed steel-concrete composite beam is needed to solve the problem that the prestress is difficult to be completely and accurately applied to the concrete on the tension side

In addition, the construction process of traditional steel-concrete composite beams is complicated, and wet work is unavoidable in many processes, and the construction period is long. The prefabricated dry connection can greatly shorten the construction period and save costs.

Images