A reinforcement device and a method of reinforcement

Abstract

The application discloses a reinforcing device and a reinforcing method, and relates to the technical field of structure engineering, which comprises a reinforcing plate, a fixed-end anchorage device and a midspan bracing mechanism. The two ends of the reinforcing plate are connected with a reinforced member through the fixed-end anchorage device respectively, and the middle part of the reinforcing plate is connected with the reinforced member through the midspan bracing mechanism. The midspan bracing mechanism is used for prestress tension of the reinforcing plate. The reinforcing device is simple in structure and strong in operability, and can improve the ultimate strength and ductility of the reinforced member.

Description

Technical Field

[0001] This invention relates to the field of structural engineering technology, and in particular to a reinforcement device and reinforcement method. Background Technology

[0002] Most existing methods for strengthening reinforced concrete flexural members employ prestressing. This involves fixing one end of a composite material sheet to an anchorage at the fixed end of the beam, applying prestress to the sheet via a tensioning mechanism at the other end, and then adhesively bonding the middle section of the composite material sheet to the surface of the member being strengthened. This traditional method suffers from several drawbacks. The tensioning mechanism is complex, requires significant space, and is not flexible in its placement. Furthermore, wet work is involved during construction, resulting in a long timeframe from start to finish. The adhesives also pose adverse health risks to workers and the surrounding environment. Mechanically, the failure mode of the strengthened beam often exhibits debonding failure, leading to low ductility. Summary of the Invention

[0003] The purpose of this invention is to provide a reinforcement device and reinforcement method to solve the problems existing in the prior art. It has a simple structure, is easy to operate, and can improve the ultimate strength and ductility of the reinforced component.

[0004] To achieve the above objectives, the present invention provides the following solution:

[0005] The present invention provides a reinforcement device, including a reinforcement plate, fixed end anchors and a mid-span support mechanism. The two ends of the reinforcement plate are respectively connected to the reinforced member through one of the fixed end anchors, and the middle part of the reinforcement plate is connected to the reinforced member through the mid-span support mechanism. The mid-span support mechanism is used to prestress the reinforcement plate.

[0006] Preferably, the fixed end anchor includes a first mounting plate, a second mounting plate, a nut, and a fixing screw. One end of the fixing screw is used to be embedded in the reinforced component. The first mounting plate and the second mounting plate are used to clamp the reinforced plate. The fixing screw passes through the first mounting plate and the second mounting plate in sequence. The nut is threadedly connected to the fixing screw to fix the first mounting plate, the reinforced plate, and the second mounting plate.

[0007] Preferably, the lower surface of the first mounting plate and the upper surface of the second mounting plate are both corrugated, and the lower surface of the first mounting plate and the upper surface of the second mounting plate have matching shapes.

[0008] Preferably, the reinforcing plate includes a first mounting part, a support part, and a second mounting part arranged in sequence. Both the first mounting part and the second mounting part are used to connect with the fixed end anchor, and the support part is used to connect with the mid-span support mechanism.

[0009] Preferably, the shapes of the first mounting portion and the second mounting portion match the shape of the lower surface of the corresponding first mounting plate.

[0010] Preferably, the mid-span support mechanism includes a buckling-resistance bracket, an upper support movable plate, an elastic-plastic structure, a lower support movable plate, and a support screw. The buckling-resistance bracket is used to connect with the reinforced component. Both ends of the support screw are threadedly connected to the buckling-resistance bracket. The upper support movable plate can contact the reinforced plate. The upper support movable plate is connected to the upper end of the elastic-plastic structure. The lower support movable plate is connected to the lower end of the elastic-plastic structure. Both the upper and lower support movable plates are sleeved on the support screw. An adjusting nut is sleeved on the support screw, and the adjusting nut is located on the lower support movable plate.

[0011] Preferably, the elastoplastic structure is S-shaped.

[0012] Preferably, the buckling brace includes an upper frame, a lower frame, and a connecting rod. The upper frame is located above the lower frame, and the upper frame and the lower frame are connected by the connecting rod. The top support screw is threadedly connected to the upper frame and the lower frame respectively.

[0013] The present invention also provides a reinforcement method using the aforementioned reinforcement device, comprising the following steps:

[0014] Step 1: Determine the strength and ductility requirements of the component to be reinforced under specific conditions;

[0015] Step 2: Install the fixed-end anchorage to connect the reinforcing plate to the fixed-end anchorage;

[0016] Step 3: Select an elastoplastic structure with suitable yield strength and yield stiffness, and install the mid-span support mechanism at the designated position;

[0017] Step 4: Adjust the distance between the lower support moving plate and the surface of the reinforced component to achieve the set prestress level, and complete the reinforcement.

[0018] The present invention achieves the following technical effects compared to the prior art:

[0019] This invention anchors the two ends of the reinforcing plate to the two ends of the member being reinforced. A mid-span support mechanism is installed in the middle of the span to lift the reinforcing plate away from the surface of the member and fix it in place, thereby achieving prestressing tension on the reinforcing plate. One or more mid-span support mechanisms can be arranged at specific locations according to design requirements. The stress performance of the mid-span support mechanism is elastoplastic. During the process of member stress, when the elastoplastic structure of the support mechanism begins to yield, the stress in the reinforcing plate will no longer increase rapidly. This not only significantly improves the ultimate strength of the member being reinforced but also provides excellent ductility. It also has the advantages of strong designability, strong operability, fast construction speed, and high reinforcement efficiency. It is suitable for the reinforcement of flexural members in reinforced concrete industrial and civil buildings or bridge structures. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. 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 effort.

[0021] Figure 1 This is a schematic diagram illustrating the application of the reinforcement device of the present invention;

[0022] Figure 2 This is a schematic diagram of the prestressing tensioning of the reinforcing plate by the mid-span support mechanism of the present invention;

[0023] Figure 3 This is an exploded view of the fixed-end anchorage of the present invention;

[0024] Figure 4 This is a schematic diagram of the mid-span support mechanism of the present invention;

[0025] Figure 5 This is a schematic diagram of the mid-span support mechanism of the present invention (with the anti-buckling frame removed);

[0026] Figure 6 This is a schematic diagram showing the positional relationship between the upper support movable plate and the reinforcing plate of the present invention;

[0027] Figure 7 This is a schematic diagram of the elastoplastic structure of the present invention;

[0028] Figure 8 This is a schematic diagram of the elastic-plastic structure of the present invention before stretching;

[0029] Figure 9 This is a schematic diagram of the elastic-plastic structure of the present invention after stretching;

[0030] Figure 10 This is a force-displacement curve of the elastoplastic structure of the present invention;

[0031] Figure 11 This is a schematic diagram illustrating the operational state of the elastoplastic structure of the present invention;

[0032] Figure 12 This is a schematic diagram of the second working state of the elastoplastic structure of the present invention;

[0033] Figure 13 This is a schematic diagram of the three working states of the elastoplastic structure of the present invention;

[0034] Wherein: 100-Reinforced component, 1-Reinforcement plate, 2-Fixed end anchor, 3-Mid-span support mechanism, 4-First mounting plate, 5-Second mounting plate, 6-Nut, 7-Fixing screw, 8-First mounting part, 9-Upper frame, 10-Upper fixing nut, 11-Upper support moving plate, 12-Elastic-plastic structure, 13-Lower support moving plate, 14-Support screw, 15-Adjusting nut, 16-Lower frame, 17-Connecting rod, 18-Sliding block, 19-Lower fixing nut, 20-Cover plate. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] The purpose of this invention is to provide a reinforcement device and method to solve the problems existing in the prior art. It has a simple structure, is easy to operate, and can improve the ultimate strength and ductility of the reinforced component. To make the above-mentioned objectives, features, and advantages of this invention more apparent and understandable, the invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0037] Example 1

[0038] like Figures 1 to 13 As shown: This embodiment provides a reinforcement device that can be used to reinforce reinforced concrete bending members, including simply supported reinforced concrete beams, the mid-span region of continuous beams, and the negative bending moment region at the supports of continuous beams. It includes a reinforcement plate 1, fixed-end anchors 2, and a mid-span support mechanism 3. The reinforcement plate 1 is made of carbon fiber reinforced composite material. Both ends of the reinforcement plate 1 are connected to the member 100 to be reinforced through a fixed-end anchor 2, and the middle part of the reinforcement plate 1 is connected to the member 100 to be reinforced through the mid-span support mechanism 3. The mid-span support mechanism 3 is used to prestress the reinforcement plate 1.

[0039] Specifically, in this embodiment, there are at least two fixed-end anchors 2. The fixed-end anchors 2 are 300mm long, 120mm wide, and 20mm thick. The fixed-end anchors 2 include a first mounting plate 4, a second mounting plate 5, a nut 6, and a fixing screw 7. One end of the fixing screw 7 is used to be embedded in the reinforced component 100. The first mounting plate 4 and the second mounting plate 5 are used to clamp the reinforcing plate 1. The upper and lower surfaces of the reinforcing plate 1 are provided with adhesive layers. A cover plate 20 is provided below the second mounting plate 5. The fixing screw 7 passes through the first mounting plate 4, the second mounting plate 5, and the cover plate 20 in sequence. The nut 6 is threadedly connected to the fixing screw 7 to fix the first mounting plate 4, the reinforcing plate 1, the second mounting plate 5, and the cover plate 20. The cover plate 20 makes the fixed-end anchors 2 bear force evenly.

[0040] In this embodiment, the lower surface of the first mounting plate 4 and the upper surface of the second mounting plate 5 are both corrugated, and the lower surface of the first mounting plate 4 and the upper surface of the second mounting plate 5 have matching shapes.

[0041] In this embodiment, the reinforcing plate 1 includes a first mounting part 8, a support part, and a second mounting part arranged sequentially. Both the first mounting part 8 and the second mounting part are used to connect with the fixed end anchor 2, and the support part is used to connect with the mid-span support mechanism 3. The shapes of the first mounting part 8 and the second mounting part match the shape of the lower surface of the corresponding first mounting plate 4. By setting the shapes of the lower surface of the first mounting plate 4, the upper surface of the second mounting plate 5, the first mounting part 8, and the second mounting part, the reinforcing plate 1 will not slide relative to the fixed end anchor 2.

[0042] During installation, the first mounting plate 4 is first fitted onto the pre-embedded fixing screws 7 in the reinforced component 100 through ten bolt holes. Then, the second mounting plate 5 is similarly fitted onto the fixing screws 7. The reinforcing plate 1 is then passed between the first mounting plate 4 and the second mounting plate 5. Finally, ten nuts 6 are fitted onto the ten fixing screws 7 and tightened, so that the first mounting plate 4 and the second mounting plate 5 are tightly joined together to fix the reinforcing plate 1. During the tensioning process, the anchoring section of the reinforcing plate 1 is pressed tightly against the first mounting plate 4 and the second mounting plate 5 due to the axial tension, which effectively increases the normal pressure between the reinforcing plate 1 and the first mounting plate 4 and the second mounting plate 5, thereby better fixing the reinforcing plate 1.

[0043] In this embodiment, the mid-span support mechanism 3 can be made of metal. The mid-span support mechanism 3 includes a buckling-resistance bracket, an upper support movable plate 11, an elastic-plastic structure 12, a lower support movable plate 13, and two support screws 14. The buckling-resistance bracket is used to connect with the reinforced member 100. The two ends of the support screws 14 are threadedly connected to the buckling-resistance bracket. The lower surface of the upper support movable plate 11 can contact the reinforced plate 1. The upper support movable plate 11 is bolted to the upper end of the elastic-plastic structure 12, and the lower support movable plate 13 is bolted to the lower end of the elastic-plastic structure 12. The upper support movable plate 11 and the lower support movable plate 13 are both sleeved on the support screws 14. An adjusting nut 15 is sleeved on the support screws 14. The adjusting nut 15 is located on the lower support movable plate 13, and the lower end of the adjusting nut 15 is in contact with the lower support movable plate 13. By rotating the adjusting nut 15, the distance between the lower support moving plate 13 and the lower surface of the reinforced component 100 is adjusted, which drives the lower support moving plate 13, the elastic-plastic structure 12 and the upper support moving plate 11 to move, thereby supporting the reinforcing plate 1. The yield stiffness and yield strength of the elastic-plastic device can be adjusted to adapt to different situations.

[0044] In this embodiment, the elastoplastic structure 12 is S-shaped. The characteristic of the elastoplastic structure 12 is that when the mechanism reaches the yield strength, it enters the plastic state, at which time the displacement increases significantly while the force increases slowly.

[0045] In this embodiment, the buckling-restrained brace adopts a trapezoidal geometry and includes an upper frame 9, a lower frame 16, and four connecting rods 17 made of angle steel. The upper frame 9 is located above the lower frame 16 and includes four angle steels and one perforated channel steel. The angle steels are connected by pre-embedded short bolts and are in complete contact with the bottom surface of the reinforced member 100. The channel steel is welded to the angle steel to ensure the stability of the channel steel, thereby ensuring the stability of the elasto-plastic structure 12 during the test. The lower frame 16 has the same structure as the upper frame 9, and together with the upper frame 9, it ensures the stability of the intermediate elasto-plastic structure 12. The upper frame 9 and the lower frame 16 are connected by connecting rods 17, and the upper frame 9 and the lower frame 16 are respectively bolted to the connecting rods 17 to achieve the disassembly and flexibility of the device. The top support screws 14 are threaded to the upper frame 9 and the lower frame 16 respectively.

[0046] During the installation of the mid-span support mechanism 3, the upper support moving plate 11 is installed first, ensuring that the chamfered surface of the reinforcing plate 1 is in contact with the upper support moving plate 11. Next, the upper support moving plate 11 and the lower support moving plate 13 are connected to the elasto-plastic structure 12 with bolts. Then, the support screw 14 is inserted into the sliding block 18 with the upper fixing nut 10, contacting the channel steel of the upper frame 9 in the buckling-resistance frame. The upper fixing nut 10 is fixedly connected to the sliding block 18, and the sliding block 18 contacts the upper frame 9. The lower end of the support screw 14 is inserted into the lower fixing nut 19 on the lower frame 16. Finally, the upper fixing nut 10 and the lower fixing nut 19 are tightened to complete the installation of the support anchor. After the mid-span support mechanism 3 is installed, prestress is applied. At this time, the lower support moving plate 13 drives the elasto-plastic structure 12, which in turn drives the upper reinforcing plate 1 downwards, completing the tensioning of the reinforcing plate 1. At this time, the elasto-plastic structure 12 remains elastic and does not undergo large deformation. During the loading process, the force on the elastic-plastic structure 12 gradually increases. Under the set reinforcement plate value, the elastic-plastic structure 12 yields. Since the lower support moving plate 13 cannot move upward due to the influence of the adjusting nut 15, the upper support moving plate 11 gradually moves upward.

[0047] This embodiment, through the excellent anchoring capabilities of the fixed ends and tensioning ends, and the elastoplastic properties of the mid-span support mechanism 3, can significantly improve the ductility of the reinforced member while substantially increasing its ultimate strength. This embodiment mainly includes the following key features:

[0048] 1. Adjusting the yield strength and yield stiffness of the elastoplastic structure 12: This can be adjusted according to the actual situation and the design requirements of the reinforced member 100, so that the reinforced beam can achieve the expected ductility effect.

[0049] II. Adjustment of the number of mid-span support mechanisms 3: The reinforcement method of mid-span support mechanisms 3 can be reflected as single-point support reinforcement, double-point support reinforcement or multi-point support reinforcement, and adjustments can be made according to the actual situation;

[0050] III. Connection method between fixed end anchor 2 and mid-span jacking mechanism 3 and reinforced member 100: Both fixed end anchor 2 and mid-span jacking mechanism 3 are fixed to the surface of reinforced member 100 by bolt connection;

[0051] IV. Connection method between the upper support moving plate 11, the lower support moving plate 13 and the elastic-plastic structure 12: The upper support moving plate 11 and the lower support moving plate 13 are respectively connected to the elastic-plastic structure 12 by bolts;

[0052] V. The tensioning method is to use the rotating adjusting nut 15 for prestress tensioning.

[0053] The structure in this embodiment has the advantages of simple implementation, excellent mechanical properties, and strong designability.

[0054] Example 2

[0055] This embodiment provides a reinforcement method using the reinforcement device of Embodiment 1, including the following steps:

[0056] Step 1: Determine the strength and ductility requirements of the reinforced component 100 under specific conditions;

[0057] Step 2: Install the fixed end anchors 2 on both sides of the surface of the reinforced component 100. Apply resin glue to the upper and lower surfaces of the first mounting part 8 and the second mounting part of the reinforcing plate 1, and pass the reinforcing plate 1 through the fixed end anchors 2. Tighten the nuts 6 and set a preload of 350 N·m to anchor the reinforcing plate 1 to the fixed end anchors 2.

[0058] Step 3: Select an elastic-plastic structure 12 with suitable yield strength and yield stiffness, install the buckling-resistant bracket and the upper support moving plate 11, ensuring that the chamfered surface of the reinforcing plate 1 and the upper support moving plate 11 are in contact only. Connect the upper support moving plate 11 and the lower support moving plate 13 to the elastic-plastic structure 12 with bolts, insert the adjusting screw into the sliding block 18 with the upper fixing nut 10, and make the adjusting screw contact the channel steel of the upper frame 9. Then tighten the upper fixing nut 10 and the lower fixing nut 19 to complete the installation of the mid-span support mechanism 3.

[0059] Step 4: Rotate the adjusting nut 15 to adjust the distance between the lower support moving plate 13 and the surface of the reinforced component 100. Then, the lower support moving plate 13 drives the elastic-plastic structure 12 and the upper support moving plate 11 to move downward. The upper support moving plate 11 drives the reinforcing plate 1 to move downward, reaching the set prestress level, completing the tensioning of the reinforcing plate 1, and completing the reinforcement.

[0060] This specification uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. Furthermore, those skilled in the art will recognize that, based on the ideas of the present invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A reinforcement device, characterized in that: It includes a reinforcing plate, fixed-end anchors, and a mid-span support mechanism. The two ends of the reinforcing plate are respectively connected to the reinforced member through one of the fixed-end anchors, and the middle part of the reinforcing plate is connected to the reinforced member through the mid-span support mechanism. The mid-span support mechanism is used to prestress the reinforcing plate. The mid-span support mechanism includes a buckling-resistance bracket, an upper support movable plate, an elastic-plastic structure, a lower support movable plate, and a support screw. The buckling-resistance bracket is used to connect with the reinforced component. Both ends of the support screw are threadedly connected to the buckling-resistance bracket. The lower surface of the upper support movable plate contacts the reinforced plate. The upper support movable plate is connected to the upper end of the elastic-plastic structure. The lower support movable plate is connected to the lower end of the elastic-plastic structure. Both the upper and lower support movable plates are sleeved on the support screw. An adjusting nut is sleeved on the support screw, and the adjusting nut is located on the lower support movable plate. The buckling-resistance bracket includes an upper frame, a lower frame, and a connecting rod. The upper frame is located above the lower frame, and the upper frame and the lower frame are connected by the connecting rod. The top support screw is threadedly connected to the upper frame and the lower frame respectively.

2. The reinforcement device according to claim 1, characterized in that: The fixed-end anchor includes a first mounting plate, a second mounting plate, a nut, and a fixing screw. One end of the fixing screw is used to be embedded in the reinforced component. The first mounting plate and the second mounting plate are used to clamp the reinforced plate. The fixing screw passes through the first mounting plate and the second mounting plate in sequence. The nut is threadedly connected to the fixing screw to fix the first mounting plate, the reinforced plate, and the second mounting plate.

3. The reinforcement device according to claim 2, characterized in that: The lower surface of the first mounting plate and the upper surface of the second mounting plate are both corrugated, and the lower surface of the first mounting plate and the upper surface of the second mounting plate have matching shapes.

4. The reinforcement device according to claim 3, characterized in that: The reinforcing plate includes a first mounting part, a support part, and a second mounting part arranged in sequence. Both the first mounting part and the second mounting part are used to connect with the fixed end anchor, and the support part is used to connect with the mid-span support mechanism.

5. The reinforcement device according to claim 4, characterized in that: The shapes of the first mounting portion and the second mounting portion match the shape of the lower surface of the corresponding first mounting plate.

6. The reinforcement device according to claim 1, characterized in that: The elastoplastic structure is S-shaped.

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