Reinforced concrete beam-column joint structure using prestressed steel strands for reinforcement and construction method therefor

Abstract

The invention relates to a reinforced concrete beam-column joint structure using prestressed steel strands for reinforcement and a construction method therefor. The joint structure comprises reinforced concrete beams and columns which are connected in a transversely vertically and perpendicularly crossed mode, beam end steel plates wider than the reinforced concrete beams are connected to the upper surfaces and the lower surfaces of the reinforced concrete beams separately, column end steel plates wider than the reinforced concrete columns are connected to the left side face and the right sideface of the reinforced concrete columns separately, and through holes are formed in the positions, protruding out of the beams or the columns in the width directions, of the beam end steel plates andthe column end steel plates; and first pre-tightening steel strands penetrating through opposite through holes are arranged between two opposite beam end steel plates, second pre-tightening steel strands penetrating through opposite through holes are arranged between two opposite column end steel plates, and a plurality of inclined first prestressed steel strands penetrating through opposite through holes are arranged between beam end steel plates and column end steel plates which are adjacent to each other. According to the structure and the method, the damage to the sections of the beams and the columns is very small, the process is simple, the operation is convenient, the structure and the method are suitable for reinforcing the damaged beam-column joint area, and manpower and financial resources needed by reconstruction are reduced.

Description

Technical field: [0001] The invention relates to a prestressed steel strand reinforced reinforced concrete beam-column node structure and a working method thereof. Background technique: [0002] On June 5, 2013, the State Intellectual Property Office announced the invention patent of "a beam-column joint reinforcement method and reinforcement device" (announcement number: CN 103132708 A), which mainly includes prestressed steel strands, pre-embedded Steel backing plate, stainless steel pre-embedded pipe and steel strand connection device, two sets of orthogonal prestressed steel strands pass through the pre-embedded pipe respectively through the upper column of the node, the beam, the lower column of the node, and the beam to form a closed loop, and through the bolt connection device Prestressed and tightly connected, the pre-embedded steel backing plate in the beam and column can evenly transfer the stress to the frame beam and column, and play a role of local reinforcement...

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Problems solved by technology

[0002] On June 5, 2013, the State Intellectual Property Office announced the invention patent of "a beam-column joint reinforcement method and reinforcement device" (announcement number: CN 103132708 A), which mainly includes prestressed steel strands, pre-embedded Steel backing plate, stainless steel pre-embedded pipe and steel strand connection device, two sets of orthogonal prestressed steel strands pass through the pre-embedded pipe respectively through the upper column of the node, the beam, the lower column of the node, and the beam to form a closed loop, and through the bolt connection device Prestressed and tightly connected, the pre-embedded steel backing plate in the beam and column can evenly transfer the stress to the frame beam and column, and play a role of local reinforcement. The steel strand bolt connection device includes clips, Bolts and iron rings, the prestress is applied by tightening the bolts, and the cable force can be measured by the vibration method to adjust the prestress size; this invention is to apply prestress to the core area of ​​the node by setting a closed loop of steel strands near the node to strengthen the structure Integrity and seismic performance; the defect of this technical solution is that the prestress is only applied in the form of a steel strand closed loop. When the diameter of the steel strand is small, the effect of prestress application is not obvious. As the diameter of the steel strand increases, although The range of prestress that can be applied has been expanded, but the size of the reserved channels has also increased correspondingly, further increasing the cross-sectional weakening of beams and columns.

[0003] On March 24, 2020, the invention patent of "a concrete beam reinforcement structure and its construction method" was authorized and published (notification number: CN 110905229 A). This patent is mainly used for reinforcement between longitudinal and transverse beams. Drill holes on the crossbeam and insert screws to add fulcrums. Through the upper fulcrum of the crossbeam, the arc-shaped steel plate tangent to the bottom of the beam is erected by the steel wire as the vibration damping component. At the same time, the vibration damping component is connected to the fulcrum on the longitudinal beam by a round steel bar. In order to effectively transmit stress, the arc-shaped steel plate is continuously deformed during the forced vibration of the beam to play a role in damping vibration, and the force is transmitted between the fulcrums by steel wires or round steel bars, which not only provides the upward support of the beam but also improves the strength of the beam. rigidity and strength, the invention effectively transmits the stress between the longitudinal and horizontal beams by adding a fulcrum, and uses a vibration-damping component to dissipate energy and reduce vibration. The size directly affects the effect of energy dissipation and vibration reduction. The position of the fulcrum is too precise, and it is difficult to achieve the corresponding accuracy in actual engineering.

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