Prefabricated reinforced concrete beam and connection joint of reinforced concrete column and beam

Abstract

The invention relates to the improvement of reinforced concrete beams for buildings and the connection joints of beams and columns, and is characterized in that transverse T-shaped structural section steel joints are disposed at the two ends of the reinforced concrete beam, wherein the T-shaped transverse end surface is at least equal to the cross section formed by the steel reinforcement cage in the beam, and at least in the reinforced concrete prefabricated beam, through holes are disposed at the corresponding positions of the main and auxiliary steel reinforcement; perforating plug welding or connection is formed by each main and auxiliary steel reinforcement perforating through the through holes; the reinforced concrete column connects the joints; an axial steel pipe is disposed at least in the cross section of the connecting part section of the column and the prefabricated beam; and a section steel joint extending outside the side surface of the column is disposed at the connecting surface of the steel pipe and the beam. Therefore, a strong joint structure is formed which is shear resistant, bending resistant, and has strong bearing capability; and also an elastic structure with a steel structural beam is formed which is anti-seismic and has good security. Prestress tension is built-in, so the invention is applicable to the production of large-span prefabricated reinforced concrete beams with a length more than 8 meters. The advantages of quick installation, high strength, elastic structure, and good security of steel structural beams are combined, and the cost is only 1 / 3 of steel structures, so the comprehensive benefit cost remains lower than that of reinforced concrete.

Description

technical field [0001] The present invention relates to the improvement of reinforced concrete beams used in buildings and the joints connected with columns, in particular to a prefabricated reinforced concrete beam with high joint strength, good shear resistance and torsion resistance and the joints connected with columns. First applied for further improvement and perfection of patent 200920283681.1. Background technique [0002] The middle beam of the building structure is usually a steel beam or a reinforced concrete (reinforced concrete) beam. Steel girders can be produced industrially, with convenient construction, high strength, and good earthquake resistance, but the cost is relatively high, and it is difficult to prevent fire and prevent corrosion. Reinforced concrete beams are divided into cast-in-place beams and prefabricated beams. Cast-in-place beams need formwork during construction, which results in large material loss and slow construction progress; prefabric...

AI Technical Summary

Problems solved by technology

In this form of stress, the connection between the section steel joint and the steel bar becomes a weak point of tensile strength and shear resistance, which may easily lead to cracks at this weak point, or even breakage of the steel bar. become a strong node

Secondly, this structural reinforced concrete prefabricated beam, according to the current national building design code, can only be used for short beams with a span of ≤ 8 meters, and when the span of the beam is greater than 8 meters, prestressed tension must be designed, and the prefabricated beam of this structure is Prestressed tension cannot be designed, and it cannot be used for span > 8 meters long beams

[0003] In addition, the joints between beams and columns are also embedded with steel bars in reinforced concrete columns. The steel joints on the columns are fixed only by the reinforced concrete columns and the steel bars inside the columns. The anchoring strength is insufficient, and the reinforced concrete at the node is prone to cracks due to stress, which affects the strength, so that the integrity, bending resistance, shear resistance, and torsional strength of the entire beam-column connection node are insufficient, and become a weak node in the structure. Less than the existing national design specifications, affecting safety

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