Reinforcement method and structure of core area of ​​reinforced concrete beam-column joint

Abstract

The present invention discloses a method for reinforcing the core area of ​​a reinforced concrete beam-column node, comprising the following steps: a. Calculate the required local compression bottom area of ​​the concrete, and convert the bottom area into a circle; b. Partially chisel out the original cast-in-place slab concrete within the reinforcement range of the reinforced column, and retain the original cast-in-place slab steel bars; c. Evenly distribute prestressed hoops and vertical bars, insert prestressed steel bars, and pour reinforcing materials; d. Tension the unbonded steel strand hoop at the end of the prestressed steel bar to strengthen the maintenance of the reinforcing material. A reinforcement structure comprises a plurality of prestressed hoops and a plurality of vertical bars that are evenly distributed around the periphery of the node to be reinforced, and a prestressed steel bar is inserted into a prestressed channel reserved on the prestressed hoop, and an unbonded steel strand hoop is tensioned at the end. Through the above-mentioned method, the present invention can achieve the purpose of reinforcing the core area of ​​the reinforced concrete beam-column node, and can eliminate the need to unload the original structure, greatly reducing the workload, improving work efficiency, and having strong adaptability.

Description

Technical Field

[0001] The invention relates to the field of reinforced concrete structure reinforcement, and in particular to a reinforced concrete beam-column node core area reinforcement method and a reinforcement structure. Background Art

[0002] High-rise reinforced concrete structures, especially steel-concrete structures, are widely used in super-high-rise buildings in my country. The concrete strength grades of beams and columns, especially those of the lower structure, vary greatly. If the construction process is not properly controlled, the low-strength concrete in the beams will flow into the core areas of the beams and columns, causing the concrete strength grade in the core areas to be seriously low, resulting in the shear and bearing capacity of the core areas of the beam-column nodes unable to meet the calculation requirements.

[0003] The existing commonly used reinforcement methods mainly include increasing the cross-section method, replacing concrete reinforcement method, external steel reinforcement method, and bonding steel plates or carbon fiber cloth reinforcement method. Among them, the longitudinal force-bearing steel bars or angle steels added to the columns by increasing the cross-section reinforcement method and the external steel reinforcement method need to extend their lower ends into the foundation and meet the anchoring requirements, which not only affects the building's usable area but is also economically unreasonable; the replacement concrete reinforcement method requires reliable temporary support during the construction process to meet the replacement needs. If the bottom structure of a super-high-rise building is replaced, the existing support technical measures cannot provide reliable support for the upper structure; the bonding steel plate or carbon fiber cloth reinforcement method requires temporary support unloading measures, and it is impossible to circumferentially penetrate the beam-column node, so the reinforcement effect is minimal. Summary of the invention

[0004] The main technical problem solved by the present invention is to provide a reinforced concrete beam-column joint core area reinforcement method and reinforcement structure, which can eliminate the need to unload the original structure, greatly reduce the workload, improve work efficiency, and have strong adaptability.

[0005] In order to solve the above technical problems, a technical solution adopted by the present invention is: to provide a method for reinforcing the core area of ​​a reinforced concrete beam-column node, comprising the following steps: a. according to the measured value of the concrete strength of the core area of ​​the beam-column node, the structure is reviewed, the required concrete local compression calculation bottom area is calculated, and the bottom area is converted into a circular area; b. the original cast-in-place slab concrete within the reinforcement range of the reinforced column is partially chiseled out, the original cast-in-place slab steel bars are retained, and they are cleaned up; c. prestressed hoops are evenly distributed around the outer periphery of the reinforced column, and a plurality of vertical bars are vertically arranged on the circumference of the prestressed hoops to form reinforcing reinforcement, and prestressed steel bar channels are reserved, prestressed steel bars are inserted into the prestressed steel bar channels, reinforcing materials are poured and strengthened maintenance is performed; d. after the reinforcing materials are cured for a period of time, the unbonded steel strand hoop is tensioned at the end of the prestressed steel bar, and the anchor is fixed to achieve the purpose of reinforcing the core area of ​​the reinforced concrete beam-column node.

[0006] In a preferred embodiment of the present invention, if the prestressed hoop in step c encounters an original frame beam during arrangement, it directly passes through the original beam and glue is injected into the through hole of the original beam.

[0007] In a preferred embodiment of the present invention, the vertical reinforcements in step c need to be arranged away from the original structural frame beams.

[0008] In a preferred embodiment of the present invention, in step d, the tensioned end of the steel strand avoids up and down at the intersection of the frame beams.

[0009] In a preferred embodiment of the present invention, the centroid of the reinforced column coincides with the centroid of the reinforcement plane.

[0010] In order to solve the above technical problems, another technical solution adopted by the present invention is: to provide a reinforcement structure for the core area of ​​a reinforced concrete beam-column node, comprising a plurality of prestressed hoops evenly distributed around the periphery of the node to be reinforced, the prestressed hoops being vertically connected by a plurality of vertical ribs, prestressed channels being reserved on the prestressed hoops, and prestressed steel bars being inserted into the prestressed channels, and unbonded steel strand hoops being tensioned at the ends.

[0011] In a preferred embodiment of the present invention, the vertical ribs are arranged on the inner side of the prestressed hoop.

[0012] The beneficial effects of the present invention are as follows: the reinforced concrete beam-column joint core area reinforcement method and reinforcement structure of the present invention do not need to unload the original structure, greatly reduce the workload, improve work efficiency, and have strong adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work, among which:

[0014] Figure 1 It is a structural schematic diagram of step b of the method for reinforcing the core area of ​​a concrete beam-column node of the present invention;

[0015] Figure 2 It is a structural schematic diagram of step c of the method for reinforcing the core area of ​​a concrete beam-column joint of the present invention;

[0016] Figure 3 It is a structural schematic diagram of step d of the method for reinforcing the core area of ​​a concrete beam-column node of the present invention;

[0017] Figure 4is a front view of step c of the method for reinforcing the core area of ​​a concrete beam-column joint of the present invention;

[0018] Figure 5 It is a partial structural schematic diagram of step d of the method for reinforcing the core area of ​​a concrete beam-column node of the present invention;

[0019] The markings of the components in the attached drawings are as follows: 1. Reinforcement range of reinforced columns, 2. Reinforced concrete structure, 3. Prestressed hoops, 4. Vertical reinforcement, 5. Prestressed steel bars, 6. Steel strands. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] A reinforced concrete beam-column joint core area reinforcement method comprises the following steps:

[0022] a. Check the structure based on the measured concrete strength value of the core area of ​​the beam-column joint, calculate the required concrete local compression calculation bottom area, and convert this bottom area into a circular area. ; ;

[0023] - design value of local load or local pressure acting on the local pressure surface;

[0024] - Design value of axial compressive strength of plain concrete;

[0025] - load distribution influence coefficient;

[0026] -Strength enhancement factor of concrete when subjected to local compression;

[0027] - local compression area of ​​concrete;

[0028] -Calculated bottom area of ​​local concrete compression;

[0029] See also Figure 1 b. Chisel away part of the original cast-in-place concrete slab within the reinforcement range 1 of the reinforced column, retain the original cast-in-place concrete slab reinforcement, and chisel away to the edge of the column, and clean it up. The chiseling should be done statically, and cutting is strictly prohibited to avoid damaging the reinforcement;

[0030] See also Figure 2c. Prestressed hoops 3 are evenly distributed around the outer circumference of the reinforced column, and multiple vertical bars 4 are vertically arranged in the circumferential direction of the prestressed hoops to form reinforcement reinforcement, and prestressed steel bar holes are reserved. Prestressed steel bars 5 are inserted into the prestressed steel bar holes. After the prestressed steel bars 5 are inserted into the holes, measures should be taken to ensure that the lubricant in the prestressed steel bars does not solidify before tensioning, and reinforcement materials are poured and strengthened. The reinforcement materials are preferably Class IV cement-based grouting materials. The top of the reinforcement range can be the same as the building surface elevation, and the bottom can be the same as the lowest beam bottom elevation;

[0031] See also Figure 3 , d. After the concrete is cured for a period of time, the ends of the prestressed steel bars 5 are tensioned with unbonded steel strands 6 and are fixed with anchors. Finally, the curing reinforcement materials are strengthened to increase the local pressure bottom area of ​​the concrete, thereby achieving the purpose of strengthening the core area of ​​the reinforced concrete beam-column node.

[0032] See also Figure 4 In step c, if the prestressed hoop encounters the original frame beam during arrangement, it can directly pass through the original frame beam. When passing through the beam, a steel bar detector can be used to detect the position of the steel bar to avoid damage to the beam bars, and glue can be injected into the through hole of the original frame beam.

[0033] In addition, when arranging the vertical reinforcement in step c, avoid the original structural beam area.

[0034] See also Figure 5 In addition, in step d, the tensioning end of the steel strand 6 avoids up and down at the intersection of the frame beams.

[0035] In addition, the centroid of the reinforced column coincides with the centroid of the reinforcement plane.

[0036] A reinforcement structure for the core area of ​​a reinforced concrete beam-column node comprises a plurality of prestressed hoops 3 uniformly distributed around the periphery of the node to be reinforced, the prestressed hoops 3 are vertically connected by a plurality of vertical ribs 4, prestressed channels are reserved on the prestressed hoops 3, prestressed steel bars 5 are inserted into the prestressed channels, and unbonded steel strands 6 are tensioned in hoops at the ends.

[0037] In addition, the vertical ribs 4 are vertically arranged on the inner side of the prestressed hoop 3 .

[0038] Different from the prior art, the reinforced concrete beam-column joint core area reinforcement method and reinforcement structure of the present invention do not need to unload the original structure, which greatly reduces the workload, improves work efficiency, and has strong adaptability.

[0039] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A reinforced concrete beam-column joint core area reinforcement method, characterized in that: The following steps are involved: a. Perform structural review based on the measured concrete strength value of the core area of ​​the beam-column joint, calculate the required concrete local compression calculation bottom area, and convert this bottom area into a circular area; b. Partially chisel away the original cast-in-place concrete within the reinforcement range of the reinforced column, retain the original cast-in-place steel bars, and clean them up; c. Evenly distribute prestressed hoops around the outer circumference of the reinforced column, and vertically arrange multiple vertical bars on the circumference of the prestressed hoops to form reinforcement reinforcement, and reserve prestressed steel bar holes, insert prestressed steel bars into the prestressed steel bar holes, pour reinforcement materials and strengthen maintenance; d. After the reinforcement material has been cured for a period of time, the unbonded steel strand hoop is tensioned at the end of the prestressed steel bar and the anchor is fixed to achieve the purpose of strengthening the core area of ​​the reinforced concrete beam-column node.

2. The reinforced concrete beam-column joint core area reinforcement method according to claim 1 is characterized in that: If the prestressed hoop in step c encounters the original frame beam during arrangement, a through hole is drilled in the original frame beam and glue is injected into the through hole under pressure.

3. The reinforced concrete beam-column joint core area reinforcement method according to claim 1 is characterized in that: When arranging the vertical reinforcement in step c, the original structural frame beams need to be avoided.

4. The reinforced concrete beam-column joint core area reinforcement method according to claim 1 is characterized in that: In the step d, the tensioning end of the steel strand is staggered up and down to avoid the intersection of the frame beams.

5. The reinforced concrete beam-column joint core area reinforcement method according to claim 1 is characterized in that: The centroid of the reinforced column coincides with the centroid of the reinforcement plane.

6. A reinforced concrete beam-column joint core area reinforcement structure, characterized in that: It comprises a plurality of prestressed hoops evenly distributed on the periphery of the nodes to be reinforced, the prestressed hoops are vertically connected by a plurality of vertical ribs, prestressed channels are reserved on the prestressed hoops, and prestressed steel bars are inserted into the prestressed channels, the ends are tensioned with unbonded prestressed hoops, and reinforcing materials are poured around the periphery of the prestressed hoops to form a reinforcement structure.

7. The reinforced structure of the core area of ​​the reinforced concrete beam-column joint according to claim 6, characterized in that: The vertical ribs are arranged on the inner side of the prestressed hoop.

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