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

Abstract

The invention discloses a prefabricated prestressed high-performance concrete composite beam based on dry connection. The composite beam comprises I-shaped steel, split concrete strips, prefabricated concrete connecting pieces, bolt connecting pieces and prestressed tendons, wherein a plurality of through round holes are formed in a web plate of the I-shaped steel in the length direction, the split concrete strips are arranged on the two sides of the web of the I-shaped steel and located between the upper flange and the lower flange, via holes coaxial with the round holes are formed in the split concrete strips, the via holes in at least one side are gradually-broadened holes, the hole diameters of the gradually-broadened holes are linearly increased in the direction from the web to the outer side, the prefabricated concrete connecting pieces are consistent with the gradually-broadened holes in shape and at least filled in the gradually-broadened holes on one side, reserved holes coaxial with the gradually-broadened holes are formed in the prefabricated concrete connecting pieces, the bolt connecting pieces are arranged in the reserved holes and the round holes in a penetrating mode, the I-shaped steel, the split concrete strips and the prefabricated concrete connecting pieces are connected into a whole, and the prestressed tendons are arranged in the split concrete strips and are consistent with the I-shaped steel in the length direction. According to the composite beam, dry-type connection is completely adopted, all components are prefabricated, and the production efficiency is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of buildings, in particular 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 beams, it is difficult to ensure that all the prestress is applied to the concrete of the lower flange accurately, 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 occur on one side or even the entire component becomes unstable and damaged. Therefore, a simple and effective prestressed steel-concrete composite beam...

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.

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