A prefabricated prestressed concrete composite beam with cast-in-place conical connectors and its construction method

Abstract

A steel prefabricated prestressed concrete composite beam with cast-in-place conical connectors, comprising: a honeycomb-shaped I-steel with holes on its web; split concrete strips arranged on both sides of the web of the honeycomb-shaped I-steel , and is located between the upper and lower flanges, on which there are via holes corresponding to the holes, and the diameter of the via holes increases along the direction of the web to both sides; the cast-in-place concrete connectors are poured in the via holes and holes, and the The honeycomb type I-beam is connected with the split concrete strip as a whole, which is thin in the middle and thick at both ends, so as to fix the position of the split concrete strip and play the role of longitudinal shear resistance; the prestressed tendon is set in the split concrete inside the bar, and is consistent with the length direction of the honeycomb I-beam; while ensuring that the prestress is accurately applied to the concrete, the concrete part can limit the out-of-plane displacement of the steel web and flange in the compression zone, increasing its surface external stability.

Description

technical field [0001] The invention belongs to the technical field of construction, in particular to a prefabricated prestressed concrete composite beam with cast-in-place conical connecting pieces 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 part of the applied prestress cannot be avoided by the steel and the concrete of the upper flange. Simply separating the concrete and the section 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 compression 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-...

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 part of the prestress is inevitably borne by the steel and the concrete of the upper flange.

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 cause the prestressed concrete to be under compression due to large bias before assembly. Cracks appear on one side or even the whole component becomes unstable and damaged

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

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