Existing beam-column joint assembly type beam-increasing transformation structure
By combining π-shaped welded beams and reinforcing steel plates, the problems of insufficient construction precision and poor connection reliability in the renovation of beam-column joints of existing buildings have been solved. This has enabled rapid and effective improvement in load-bearing capacity and seismic performance, while providing reliable damage warnings and simplifying the construction process.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-09
- Publication Date
- 2026-04-03
AI Technical Summary
The renovation of existing building beam-column joints presents problems such as insufficient construction precision, poor connection reliability, and disruption to normal building use during the construction process. In particular, it is challenging to quickly and effectively enhance load-bearing capacity and seismic performance without removing the original components.
A combined structure consisting of π-shaped welded beams, newly added concrete beams, longitudinal reinforcement, reinforcing steel plates, and chemical anchors is adopted. By combining the π-shaped welded beams with existing concrete columns and beams, the number of rebars in the core area is reduced, the strength of the core area of the nodes is enhanced, and lead zirconate titanate patches are used for damage early warning detection.
It achieved efficient reinforcement of the core area of the node, improved the bearing capacity and seismic performance, simplified the construction process, reduced construction disturbance, enhanced connection reliability, and provided a reliable damage early warning mechanism.
Smart Images
Figure CN224078750U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of building structure technology, specifically to a prefabricated beam-addition modification structure for existing beam-column joints. Background Technology
[0002] In modern architecture, with the acceleration of urbanization and the increase in the service life of buildings, many existing building structures face problems such as insufficient load-bearing capacity and substandard seismic performance. In particular, the need for structural reinforcement in beam-column joint areas is particularly urgent. Traditional reinforcement methods, such as increasing the cross-section, steel plate bonding, or carbon fiber reinforcement, can improve the load-bearing capacity of the structure, but the construction process is complex, the construction period is long, and it has a significant impact on the building's functionality.
[0003] For the renovation of existing building beam-column joints, especially without removing the original components, how to quickly and effectively enhance the load-bearing capacity of beam-column joints using prefabricated methods has become a research hotspot in the field of structural renovation and reinforcement. Prefabricated beam-addition technology is efficient and environmentally friendly, and can effectively reinforce beam-column joints while reducing construction disturbance, showing broad application prospects. However, existing beam-addition technologies often suffer from problems such as insufficient construction precision, poor connection reliability, and disruption to the normal use of the building during construction. Summary of the Invention
[0004] The purpose of this utility model is to address the shortcomings of the existing technology by providing a prefabricated beam-addition modification structure for existing beam-column joints. This structure reinforces the core area of the joint to enhance its strength and reduce the number of rebars required. It can effectively improve structural performance and simplify the construction process, and has significant practical engineering implications.
[0005] The objective of this utility model is achieved through the following technical solution:
[0006] A prefabricated beam-addition modification structure for existing beam-column joints includes existing concrete columns and existing concrete beams, with the newly added concrete beams disposed on the side of the existing concrete columns. The characteristic feature is that the newly added concrete beams contain π-shaped welded beams perpendicular to the existing concrete columns.
[0007] The newly added concrete beam is internally provided with two π-shaped welded beams, which are arranged vertically and horizontally with their openings facing each other.
[0008] The upper and lower surfaces of the horizontal plane of the π-shaped welded beam are respectively provided with newly added concrete longitudinal bars perpendicular to the existing concrete column, and the newly added concrete longitudinal bars are fixedly connected to the existing concrete column.
[0009] The vertical outer side of the π-shaped welded beam is horizontally fixed with welded beam studs.
[0010] Reinforcing steel plates are installed at the joints of the existing concrete columns, the existing concrete beams, and the newly added concrete beams.
[0011] The reinforcing steel plates include column-side steel plates, beam-side steel plates, beam-top steel plates, and beam-bottom steel plates; the column-side steel plates are fixed to the two sides of the existing concrete column; the beam-side steel plates, beam-top steel plates, and beam-bottom steel plates are respectively fixed to the sides, top, and bottom of the existing concrete beam and the newly added concrete beam; the beam-top steel plate is fixedly connected to the column-side steel plates, and the beam-side steel plates located on both sides of the beam body of the existing concrete beam and the newly added concrete beam are tensioned and fixed; the beam-side steel plates are fixedly connected to the beam-bottom steel plates.
[0012] Structural adhesive is provided between the column side steel plate and the two sides of the existing concrete column, between the beam side steel plate and the sides and top of the existing concrete beam and the newly added concrete beam, and between the beam bottom steel plate and the bottom of the existing concrete beam and the newly added concrete beam.
[0013] The column side steel plate is fixedly connected to the existing concrete column by reinforcing bars, which are arranged in a staggered pattern; the height of the column side steel plate is greater than twice the height of the existing concrete beam.
[0014] Anchor bolt holes are provided on both sides of the existing concrete beam and the newly added concrete beam. Chemical anchor bolts are installed in the anchor bolt holes to fix the beam side steel plates on the existing concrete beam and the newly added concrete beam with tension.
[0015] The π-shaped welded beam is fitted with lead zirconate titanate patches.
[0016] The advantages of this utility model are:
[0017] 1) By organically combining new concrete beams, welded beams, new concrete longitudinal reinforcement, column side steel plates, beam side steel plates, beam top steel plates, beam bottom steel plates, column side studs, welded beam studs, anchored steel bars, chemical anchors, and existing concrete columns and beams, the number of anchored steel bars in the core area has been reduced.
[0018] 2) By using a combination of π-shaped welded beams and reinforced concrete, the core area of the node is reinforced, thereby enhancing its strength.
[0019] 3) Simple structure and easy construction.
[0020] 4) The column side studs are vertically installed on the column side steel plate, and the installation range is at the junction of the newly added concrete beam and the column side steel plate. This effectively improves the adhesion between the newly added concrete beam and the column side steel plate and prevents the interface area between the steel plate and the concrete from peeling and sliding.
[0021] 5) By evenly distributing the shear force in the core area of the node to the steel plates and rebars on the columns, the stress distribution is more uniform, which significantly improves the seismic performance of the core area of the node.
[0022] 6) By placing lead zirconate titanate (PZT) patches on the upper surface of the π-shaped welded beam, and using piezoelectric sensors to detect the slippage properties of the steel bars and concrete, a reliable solution for damage early warning is provided. Attached Figure Description
[0023] Figure 1 This is a schematic diagram of the structure of this utility model;
[0024] Figure 2 This is a three-dimensional structural diagram of the present invention. Detailed Implementation
[0025] The features and other related features of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments, so as to facilitate the understanding of those skilled in the art:
[0026] like Figure 1-2 As shown in the figure, the numbers 1-13 represent: 1. Existing concrete column, 2. Existing concrete beam, 3. Newly added concrete beam, 4. π-shaped welded beam, 5. Newly added concrete longitudinal reinforcement, 6. Column side steel plate, 7. Beam side steel plate, 8. Beam top steel plate, 9. Beam bottom steel plate, 10. Welded beam stud, 11. Rebar, 12. Chemical anchor, 13. Lead zirconate titanate patch.
[0027] Example: Figure 1 and Figure 2 As shown, the prefabricated beam-addition structure for existing beam-column joints in this embodiment includes an existing concrete column 1 and an existing concrete beam 2. The existing concrete column 1 is square, and an existing concrete beam 2 is set on one side of the existing concrete column 1.
[0028] In this embodiment, a new concrete beam 3 is provided on the opposite side from the existing concrete beam 2. The new concrete beam 3 is perpendicular to the existing concrete column 1, and the centerline of the new concrete beam 3 passes through the intersection of the centerlines of the existing concrete beam 2. A π-shaped welded beam 4 perpendicular to the existing concrete column 1 is provided inside the new concrete beam 3.
[0029] This embodiment organically combines the newly added concrete beam 3 and π-shaped welded beam 4 with the existing concrete column 1 and existing concrete beam 2. Through a simple structure and convenient construction, it reduces the number of rebars in the core area of the structural nodes and improves the load-bearing capacity of the structural nodes while ensuring strength requirements, effectively reducing safety hazards.
[0030] The π-shaped welded beam 4 consists of two vertical planes and one horizontal plane. Two π-shaped welded beams 4 are provided, positioned above and below each other with their openings facing each other. In practical use, the combined effect of the π-shaped welded beams 4 and the outer reinforced concrete enclosure strengthens the core area of the node, thereby enhancing its strength. Furthermore, the top-to-bottom arrangement of the two π-shaped welded beams 4 with their openings facing each other facilitates concrete pouring and prevents voids from forming inside the newly added concrete beam 3.
[0031] Multiple newly added concrete longitudinal reinforcement bars 5 are fixedly connected perpendicularly to the existing concrete column 1 on the upper and lower surfaces of the horizontal planes of the two π-shaped welded beams 4. Welded beam studs 10 are horizontally fixedly connected to the outer side of the vertical plane of each π-shaped welded beam 4. In actual use, the addition of the concrete longitudinal reinforcement bars 5 and the welded beam studs 10 improves the bonding between the new concrete beam 3 and the π-shaped welded beam 4. The multiple newly added concrete longitudinal reinforcement bars 5 are welded to the π-shaped welded beam 4, which facilitates connection and provides good stability.
[0032] Reinforcing steel plates are installed at the joints of the existing concrete column 1, the existing concrete beam 2, and the newly added concrete beam 3.
[0033] The reinforcing steel plates include column-side steel plates 6, beam-side steel plates 7, beam-top steel plates 8, and beam-bottom steel plates 9. Column-side steel plates 6 are fixed to the four sides of the existing concrete column 1. Beam-side steel plates 7, beam-top steel plates 8, and beam-bottom steel plates 9 are fixed to the sides, top, and bottom of the existing concrete beam 2 and the newly added concrete beam 3, respectively. Beam-top steel plates 8 are fixedly connected to column-side steel plates 6. Beam-side steel plates 7 on both sides of each beam are tensioned together. Beam-side steel plates 7 are fixedly connected to beam-bottom steel plates 9.
[0034] In actual use, the contact surfaces of each steel plate with the existing concrete column 1, the existing concrete beam 2 and the newly added concrete beam 3 should be roughened before the steel plates are installed. This can ensure better stability of the installation.
[0035] The installation of reinforcing steel plates not only further reinforced the existing concrete column 1, the existing concrete beam 2, and the newly added concrete beam 3, but also made the reinforced structure of the joint between the old and new concrete beams more stable.
[0036] Structural adhesive is applied between the column side steel plate 6 and the four sides of the existing concrete column 1, between the beam side steel plate 7 and the sides of each beam, between the beam top steel plate 8 and the top surface of each beam, and between the beam bottom steel plate 9 and the bottom surface of each beam.
[0037] In practical use, the contact surfaces of the steel plate with the existing concrete column 1, the existing concrete beam 2 and the newly added concrete beam 3 should first be roughened. Then, the column side steel plate 6 is bonded to the four sides of the existing concrete column 1 with structural adhesive. The beam side steel plate 7 is bonded to the side of each beam, the beam top steel plate 8 is bonded to the top surface of each beam, and the beam bottom steel plate 9 is bonded to the bottom surface of each beam.
[0038] The structural adhesive bonding makes the existing concrete column 1, the existing concrete beam 2, and the newly added concrete beam 3 more robust.
[0039] The column-side steel plate 6 is fixedly connected to the existing concrete column 1 by reinforcing bars 11, which are arranged in a staggered pattern. The height of the column-side steel plate 6 is more than twice the height of the existing concrete beam 2.
[0040] In practical use, the column side steel plate 6 is fixedly connected to the existing concrete column 1 by the anchored steel bars 11, making the connection between the column side steel plate 6 and the existing concrete column 1 tighter. The staggered arrangement of the anchored steel bars 11 further enhances stability. When the height of the column side steel plate 6 is greater than twice the height of the existing concrete beam 2, it is beneficial for the shear force at the beam end to be effectively transferred to the column, preventing shear failure at the beam-column joint.
[0041] Anchor bolt holes are provided on both sides of the existing concrete beam 2 and the newly added concrete beam 3. Chemical anchor bolts 12 are installed in the anchor bolt holes. The chemical anchor bolts 12 secure the beam side steel plates 7 on the existing concrete beam 2 and the newly added concrete beam 3 with tension.
[0042] In practical use, the chemical anchors 12 make the reinforcement structure of the joint between the old and new concrete beams and columns more stable. In particular, the use of chemical anchors 12 makes the existing concrete beams and the newly added concrete beams more coordinated with the steel plates on the side of the beams, and prevents the interface between the steel plates and the concrete from peeling and sliding.
[0043] A lead zirconate titanate patch 13 was ground and attached to the upper part of the π-shaped welded beam 4.
[0044] In practical use, the upper part of the π-shaped welding beam 4 needs to be cleaned with an alcohol swab after grinding and polishing, which can improve the sensitivity of the patch.
[0045] Although the above embodiments have described the concept and embodiments of the present invention in detail with reference to the accompanying drawings, those skilled in the art will recognize that various improvements and modifications can still be made to the present invention without departing from the scope of the claims, and therefore will not be elaborated here.
Claims
1. A prefabricated beam-addition renovation structure for existing beam-column joints, comprising existing concrete columns and existing concrete beams, wherein the newly added concrete beams are disposed on the side of the existing concrete columns, characterized in that: The newly added concrete beam contains a π-shaped welded beam perpendicular to the existing concrete column.
2. The prefabricated beam-addition modification structure for existing beam-column joints according to claim 1, characterized in that: The newly added concrete beam is internally provided with two π-shaped welded beams, which are arranged vertically and horizontally with their openings facing each other.
3. The prefabricated beam-addition modification structure for existing beam-column joints according to claim 1, characterized in that: The upper and lower surfaces of the horizontal plane of the π-shaped welded beam are respectively provided with newly added concrete longitudinal bars perpendicular to the existing concrete column, and the newly added concrete longitudinal bars are fixedly connected to the existing concrete column.
4. The prefabricated beam-addition modification structure for existing beam-column joints according to claim 1, characterized in that: The vertical outer side of the π-shaped welded beam is horizontally fixed with welded beam studs.
5. The prefabricated beam-addition modification structure for existing beam-column joints according to claim 1, characterized in that: Reinforcing steel plates are installed at the joints of the existing concrete columns, the existing concrete beams, and the newly added concrete beams.
6. The prefabricated beam-addition modification structure for existing beam-column joints according to claim 5, characterized in that: The reinforcing steel plates include column-side steel plates, beam-side steel plates, beam-top steel plates, and beam-bottom steel plates; the column-side steel plates are fixed to the two sides of the existing concrete column; the beam-side steel plates, beam-top steel plates, and beam-bottom steel plates are respectively fixed to the sides, top, and bottom of the existing concrete beam and the newly added concrete beam; the beam-top steel plate is fixedly connected to the column-side steel plates, and the beam-side steel plates located on both sides of the beam body of the existing concrete beam and the newly added concrete beam are tensioned and fixed; the beam-side steel plates are fixedly connected to the beam-bottom steel plates.
7. The prefabricated beam-addition modification structure for existing beam-column joints according to claim 6, characterized in that: Structural adhesive is provided between the column side steel plate and the two sides of the existing concrete column, between the beam side steel plate and the sides and top of the existing concrete beam and the newly added concrete beam, and between the beam bottom steel plate and the bottom of the existing concrete beam and the newly added concrete beam.
8. A prefabricated beam-addition modification structure for existing beam-column joints according to claim 6 or 7, characterized in that: The column side steel plate is fixedly connected to the existing concrete column by reinforcing bars, which are arranged in a staggered pattern; the height of the column side steel plate is greater than twice the height of the existing concrete beam.
9. The prefabricated beam-addition modification structure for existing beam-column joints according to claim 6, characterized in that: Anchor bolt holes are provided on both sides of the existing concrete beam and the newly added concrete beam. Chemical anchor bolts are installed in the anchor bolt holes to fix the beam side steel plates on the existing concrete beam and the newly added concrete beam with tension.
10. The prefabricated beam-addition modification structure for existing beam-column joints according to claim 1, characterized in that: The π-shaped welded beam is fitted with lead zirconate titanate patches.