Fence type carbon fiber reinforced shear wall structure and reinforcing method thereof

Abstract

The invention relates to a fence type carbon fiber reinforced shear wall structure and a reinforcing method thereof, and belongs to the technical field of shear wall reinforcement. Comprising an original wall body, cracks are formed in the original wall body, fence-type carbon fibers are arranged on the original wall body in a reinforcing mode, the fence-type carbon fibers are in a fence shape formed by cutting and splicing carbon fibers, and the splicing portions are reinforced through binders. The fence type carbon fibers are flatly laid at cracks of an original wall body and completely cover the cracks. The problem that during traditional carbon fiber reinforcement, the tensile strength may be gradually reduced, and the reinforcement effect is affected can be solved.

Description

Technical Field

[0001] The invention relates to a shear wall reinforcement method, in particular to a fence-type carbon fiber reinforced shear wall structure and a reinforcement method thereof, belonging to the technical field of shear wall reinforcement. Background Art

[0002] Although carbon fiber U-shaped reinforcement can improve the bearing capacity and stability of the structure to a certain extent, it also has some disadvantages or limitations: if there is no proper anchoring measure when the carbon fiber cloth is pasted, its stress may be very low. After cracks appear near the concentrated force, peeling damage is likely to occur, affecting the reliability of the structure. Building structural adhesive is usually used as a binder for carbon fiber reinforcement, and this binder is sensitive to temperature. Therefore, the force performance of the reinforced component may be greatly affected by temperature changes. Carbon fiber cloth mainly improves the tensile strength of structural components, while its contribution to stiffness is almost zero, and the direction of reinforcement is single. This means that in some occasions where stiffness needs to be increased, carbon fiber U-shaped reinforcement may not be the best choice. The environment is extremely corrosive to carbon fiber cloth. Over time, the tensile strength of carbon fiber may gradually decrease, thus affecting the reinforcement effect. According to national reinforcement specifications, in some cases, carbon fiber U-shaped reinforcement may not meet the demand for a significant increase in bearing capacity.

[0003] At present, after searching, CN117108097A provides a method for reinforcing and repairing reinforced concrete structures, which uses a carbon fiber adhesive reinforcement method to reinforce cracked reinforced concrete houses or floors that need to be reinforced, uses a cross-section enlargement reinforcement method to reinforce support columns and shear walls below 6 floors, uses an external steel reinforcement method to reinforce support columns and shear walls above 6 floors, and uses a steel plate adhesive reinforcement method to reinforce beams. When cracks or gaps appear in beams or shear walls, they are first reinforced using a carbon fiber adhesive reinforcement method and then an external steel reinforcement method or an increased cross-section reinforcement method. However, the technology surrounding the carbon fiber adhesive reinforcement method is only the traditional reinforcement method mentioned in the background technology above, and there is still a problem that carbon fiber reinforcement cannot meet the demand for a significant increase in bearing capacity, and the above-mentioned problems still exist. Summary of the invention

[0004] In view of the above-mentioned defects of the above-mentioned prior art, the present invention proposes a fence-type carbon fiber reinforced shear wall structure and a reinforcement method thereof, so as to solve the problem that the tensile strength of traditional carbon fiber reinforcement may gradually decrease, thereby affecting the reinforcement effect.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is as follows: A fence-type carbon fiber reinforced shear wall structure comprises an original wall having cracks. The original wall is reinforced with fence-type carbon fibers, the fence-type carbon fibers are formed into a fence shape by cutting and splicing carbon fibers, and the splicing parts are reinforced with an adhesive; the fence-type carbon fibers are laid flat on the cracks of the original wall and completely cover the cracks.

[0006] Furthermore, the overlap length of the fence-shaped carbon fiber along the long direction of the carbon fiber sheet is more than 10 cm, and there is no overlap in the length and width direction of the carbon fiber sheet.

[0007] Furthermore, each small fence grid in the fence-type carbon fiber is a rhombus, and the side lengths of adjacent rhombuses are 100*150mm, 100mm*200mm, 250mm*100mm or 300mm*100mm, with 50mm as the basic modulus.

[0008] Furthermore, the inclination angle of the rhombus acute angle of each small fence grid in the fence-shaped carbon fiber is consistent with the direction of the original wall crack, and the inclination angle error of the rhombus acute angle is within 5 degrees.

[0009] The reinforcement method of the fence-type carbon fiber reinforced shear wall structure comprises the following steps: S1. First, you need to prepare all the tools and raw materials, including carbon fiber, adhesive, and steel brush, divide the progress of the project according to the divided procedures, and formulate a project progress plan; S2. Weigh the main agent and curing agent of the adhesive accurately according to the prescribed ratio, put them into the container and stir them evenly with a stirrer. The amount mixed once should be used up within the usable time; S3. Remove the peeling, loose, honeycombed, corroded and deteriorated concrete on the crack surface to expose the concrete structure layer; grind the surface of the crack to be reinforced to make it smooth, remove the surface slurry and oil stains, until the new surface of the concrete structure is completely exposed; S4. Chamfer the corners and grind them into arc shapes; fill or seal the cracks with epoxy resin according to the design requirements, and grind the surface. Then use a strong hair dryer or vacuum cleaner to completely remove the dust on the surface and keep it dry; S5. Cut the carbon fiber cloth according to the designed size and cut it into a fence shape to form individual carbon fiber sheets. The overlap length of the carbon fiber sheets in the longitudinal direction of the fence-type carbon fiber is more than 10 cm. The overlapped parts should be coated with more adhesive. There is no need to overlap in the width direction of the carbon fiber sheets. After cutting, wipe the surface of the fence-type carbon fiber with absorbent cotton dipped in acetone to clean it; S6. Clarify the specific location and range of fence-type carbon fiber reinforcement, use ink fountain to make a layout, and pop out the center line, upper and lower edge line positions of the carbon fiber plate or carbon fiber cloth; S7. Use a roller to evenly apply the mixed adhesive to the surface of the original wall base where the adhesive is to be pasted. Keep a uniform and comprehensive thickness and good wettability during application. Apply the cut fence-shaped carbon fiber sheets to the base coated with the adhesive. S8. When attaching the sheets, there should be no air between the fence-shaped carbon fiber and the epoxy resin; use a roller to roll on the fence-shaped carbon fiber along the direction of the carbon fiber sheet for multiple times to allow the adhesive to penetrate into the carbon fiber and squeeze out the bubbles.

[0010] Furthermore, in S4, the arc radius of the corner pasting location is not less than 20 mm, and the surface of the corner pasting location is repaired and made smooth with a repair material.

[0011] Furthermore, in S6, according to the design requirements, a pasting outline is popped out at the location where the fence-type carbon fiber needs to be pasted. The outline is 20 mm larger than the actual pasting size to facilitate subsequent polishing and processing; when the line is drawn, it is necessary to ensure that the line is clear and accurate so that the subsequent construction steps can proceed smoothly.

[0012] Furthermore, the selected spacing of each fence grid in the fence-shaped carbon fiber should be combined with the actual crack size, and the inclination angle of the diamond-shaped acute angle of each fence grid is consistent with the crack direction of the original wall.

[0013] Furthermore, in S7, the surfaces of each carbon fiber sheet of the fence-shaped carbon fiber are scraped and pressed from the middle to both sides until the adhesive seeps out, so as to remove bubbles and ensure that the adhesive fully infiltrates the carbon fiber sheet; this step is repeated layer by layer when multiple layers are pasted.

[0014] Furthermore, after S8, the construction should be prevented from being exposed to rain or moisture within 24 hours after completion, and the construction surface should be prevented from being damaged by hard objects. The curing and maintenance time should be no less than the prescribed number of days.

[0015] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art: In the present invention, the engineering plan is firstly scheduled in advance, and the necessary tools are prepared, and then the main agent and curing agent are weighed according to the specified ratio, the deteriorated concrete on the crack surface is removed, the carbon fiber cloth is cut, the corners are polished and the cracks are sealed, the carbon fiber cloth is cut according to the design size, the carbon fiber is cut into a fence shape, the specific position and range of the carbon fiber reinforcement are clarified, so as to determine the installation position of the anchor, the line is drawn on the shear wall, and the surface of the base layer to be pasted is evenly brushed with a roller, and the fence-type carbon fiber is patched along the crack. A special roller can be used to roll on the carbon fiber sheet along the fiber direction for multiple times to make the adhesive penetrate into the fiber and squeeze out the bubbles. The fence-type carbon fiber reinforcement can reinforce the cracks in multiple directions, thereby enhancing the stability of the shear wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the fence-type carbon fiber reinforced shear wall structure of the present invention; Figure 2 The present invention Figure 1 AA section view; Figure 3 It is a flow chart of reinforcing a fence-type carbon fiber reinforced shear wall structure according to the present invention. DETAILED DESCRIPTION

[0017] The following is combined with Figure 1-3 The present invention is further described in detail with specific implementations to facilitate a clear understanding of the present invention, but they do not constitute a limitation on the present invention.

[0018] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as “upper”, “lower”, “front”, “back”, “left”, “right”, “vertical”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0019] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0020] Example 1 As attached Figure 1-2 As shown, the fence-type carbon fiber reinforced shear wall structure of this embodiment includes an original wall 2, a crack 1 on the original wall 2, and a fence-type carbon fiber 6 is reinforced on the original wall 2. The fence-type carbon fiber 6 is formed by cutting and splicing carbon fibers into a fence shape, and the splicing part is reinforced with an adhesive. The fence-type carbon fiber 6 is laid flat on the crack 1 of the original wall 2 and completely covers the crack 1.

[0021] In this embodiment, Figure 1 As shown, the overlap length of the joint 3 of the fence-type carbon fiber 6 along the length direction of the carbon fiber sheet is more than 10 cm, and there is no overlap in the length and width direction of the carbon fiber sheet. In addition, each fence grid in the fence-type carbon fiber 6 is a rhombus, and the side length of adjacent rhombuses is 100*150 mm. The inclination angle 4 of the rhombus acute angle of each fence grid in the fence-type carbon fiber 6 is consistent with the direction of the crack 1 of the original wall 2, the rhombus acute angle is 60 degrees, and the inclination angle error is within 5 degrees.

[0022] Example 2 In this embodiment, each small fence grid in the fence-shaped carbon fiber 6 is a rhombus, and the side length of adjacent rhombuses is 250mm*100mm. Other structures and connection methods are the same as those in Embodiment 1 and will not be described in detail here.

[0023] Example 3 In this embodiment, each small fence grid in the fence-shaped carbon fiber 6 is a rhombus, and the side length of adjacent rhombuses is 300mm*100mm. Other structures and connection methods are the same as those in embodiment 1, and will not be described in detail here.

[0024] Example 4 The specific reinforcement method of the fence-type carbon fiber reinforced shear wall structure of the above-mentioned embodiments 1-3 is as follows: Figure 3 As shown, the following steps are included: S1. First, you need to prepare all the tools and raw materials, including carbon fiber, adhesive, and steel brush, divide the progress of the project according to the divided procedures, and formulate a project progress plan.

[0025] S2. Accurately weigh the main agent and curing agent of the adhesive according to the specified ratio, put them into the container and stir them evenly with a stirrer. The amount mixed at one time should be used up within the usable time.

[0026] S3. Remove the peeling, loose, honeycombed, corroded and deteriorated concrete on the surface of crack 1 to expose the concrete structure layer. Grind the surface of the reinforced crack 1 to make it smooth, remove the surface slurry and oil stains, until the new surface of the concrete structure is completely exposed.

[0027] S4. Chamfer the corner adhesive part 5 and grind it into an arc shape, and the arc radius should not be less than 20mm. The arc radius of the corner adhesive part 5 should not be less than 20mm, and the surface of the corner adhesive part 5 should be repaired and smoothed with repair materials. Use epoxy resin to fill or seal the crack 1 according to the design requirements, and grind its surface, and then use a strong hair dryer or vacuum cleaner to completely remove the surface dust and keep it dry.

[0028] S5. Cut the carbon fiber cloth according to the designed size and cut it into a fence shape to form individual carbon fiber sheets. The overlap length of the joint 3 of the fence-type carbon fiber 6 in the length direction is more than 10 cm. More adhesive should be applied to the overlapped parts. No overlap is required in the width direction of the carbon fiber sheet. After cutting, wipe the surface of the fence-type carbon fiber 6 with acetone with absorbent cotton.

[0029] S6. Clarify the specific location and range of the fence-type carbon fiber 6 reinforcement, use the ink fountain to mark the center line and upper and lower edge lines of the carbon fiber plate or carbon fiber cloth. According to the design requirements, the pasting outline is popped out at the location where the fence-type carbon fiber 6 needs to be pasted. The outline is 20mm larger than the actual pasting size for subsequent grinding and processing. When marking the line, ensure that the line is clear and accurate so that the subsequent construction steps can proceed smoothly.

[0030] S7, use a roller to evenly apply the mixed adhesive to the surface of the original wall 2 base layer of the part to be pasted, maintain uniform and comprehensive thickness and good wettability during application, and apply the cut carbon fiber sheets of the fence-type carbon fiber 6 to the base layer coated with the adhesive. The selection spacing of each fence grid in the fence-type carbon fiber 6 should be combined with the actual size of the crack 1, and the inclination angle 4 of the diamond-shaped acute angle of each fence grid is consistent with the cracking direction of the crack 1 of the original wall 2. Scrape and press the surface of each carbon fiber sheet of the fence-type carbon fiber 6 from the middle to both sides until the adhesive seeps out to remove bubbles and ensure that the adhesive fully infiltrates the carbon fiber sheet. Repeat this step layer by layer when pasting multiple layers.

[0031] S8, during patching, there should be no air between fence-shaped carbon fiber 6 and epoxy resin. Roll on fence-shaped carbon fiber 6 along the carbon fiber sheet direction for many times with a roller to make the adhesive infiltrate into the carbon fiber and squeeze out bubbles.

[0032] After step S8, the construction is completed within 24 hours to prevent rain or moisture, and to prevent hard objects from damaging the construction surface. The curing and maintenance time is not less than the specified number of days.

[0033] The above is only a preferred embodiment of the present invention, and does not impose any formal limitation on the structure of the present invention. The layout type and the number of uses of the present invention are not limited to this example, and can be optimized and selected according to the actual project. Any modification, equivalent change and decoration of the above embodiment based on the technical principle of the present invention that does not deviate from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A fence-type carbon fiber reinforced shear wall structure, comprising an original wall (2), the original wall (2) having a crack (1), characterized in that: The original wall (2) is reinforced with fence-shaped carbon fibers (6), the fence-shaped carbon fibers (6) being formed into a fence shape by cutting and splicing carbon fibers, and the spliced ​​parts are reinforced with an adhesive; the fence-shaped carbon fibers (6) are laid flat on the cracks (1) of the original wall (2) and completely cover the cracks (1).

2. The fence-type carbon fiber reinforced shear wall structure according to claim 1, characterized in that: The overlap length of the joint (3) of the fence-shaped carbon fiber (6) along the length direction of the carbon fiber sheet is more than 10 cm, and there is no overlap in the length and width direction of the carbon fiber sheet.

3. The fence-type carbon fiber reinforced shear wall structure according to claim 1, characterized in that: Each small fence grid in the fence-shaped carbon fiber (6) is in the shape of a diamond, and the side lengths of adjacent diamonds are 100*150mm, 100mm*200mm, 250mm*100mm or 300mm*100mm, with 50mm as the basic modulus.

4. The fence-type carbon fiber reinforced shear wall structure according to claim 3, characterized in that: The inclination angle (4) of the rhombus acute angle of each small grid in the fence-shaped carbon fiber (6) is consistent with the direction of the crack (1) in the original wall (2), and the inclination angle error of the rhombus acute angle is within 5 degrees.

5. A reinforcement method for a fence-type carbon fiber reinforced shear wall structure according to any one of claims 1 to 4, characterized in that: The steps include: S1. First, you need to prepare all the tools and raw materials, including carbon fiber, adhesive, and steel brush, divide the progress of the project according to the divided procedures, and formulate a project progress plan; S2. Weigh the main agent and curing agent of the adhesive accurately according to the prescribed ratio, put them into the container and stir them evenly with a stirrer. The amount mixed once should be used up within the usable time; S3. Remove the peeling, loose, honeycombed, corroded and deteriorated concrete on the surface of the crack (1) to expose the concrete structure layer; polish the surface of the crack (1) to be reinforced to make it smooth, remove the surface slurry and oil stains, until the new surface of the concrete structure is completely exposed; S4. Chamfer the corner adhesive part (5) and grind it into an arc shape; fill or seal the cracks with epoxy resin according to the design requirements, and grind the surface. Then use a strong hair dryer or vacuum cleaner to completely remove the dust on the surface and keep it dry; S5. Cut the carbon fiber cloth according to the designed size and cut it into a fence shape to form individual carbon fiber sheets. The overlap length of the joint (3) of the fence-shaped carbon fiber (6) in the longitudinal direction of the carbon fiber sheet is more than 10 cm. More adhesive should be applied to the overlapped part. There is no need to overlap in the width direction of the carbon fiber sheet. After cutting, wipe the surface of the fence-shaped carbon fiber (6) with acetone using absorbent cotton to clean it; S6. Determine the specific location and range of the fence-type carbon fiber (6) reinforcement, use an ink fountain to mark out the center line and upper and lower edge line positions of the carbon fiber plate or carbon fiber cloth; S7, using a roller to evenly apply the mixed adhesive to the surface of the original wall (2) base layer at the location to be bonded, maintaining a uniform and comprehensive thickness and good wettability during application, and applying the cut fence-shaped carbon fiber (6) sheets of carbon fiber to the base layer coated with the adhesive; S8. When attaching the sheets, there should be no air between the fence-shaped carbon fiber (6) and the epoxy resin; a roller is used to roll the fence-shaped carbon fiber (6) along the direction of the carbon fiber sheet for multiple times to allow the adhesive to penetrate into the carbon fiber and squeeze out the bubbles.

6. The reinforcement method according to claim 5, characterized in that: In the above-mentioned S4, the arc radius of the corner pasting part (5) is not less than 20 mm, and the surface of the corner pasting part (5) is repaired and made smooth with a repair material.

7. The reinforcement method according to claim 6, characterized in that: In S6, according to the design requirements, a pasting outline is drawn at the location where the fence-shaped carbon fiber (6) is to be pasted. The outline is 20 mm larger than the actual pasting size to facilitate subsequent polishing and processing. When drawing the outline, it is necessary to ensure that the line is clear and accurate so that the subsequent construction steps can proceed smoothly.

8. The reinforcement method according to claim 7, characterized in that: The selected spacing of each fence grid in the fence-shaped carbon fiber (6) should be combined with the actual size of the crack (1), and the inclination angle (4) of the diamond-shaped acute angle of each fence grid is consistent with the cracking direction of the crack (1) of the original wall (2).

9. The reinforcement method according to claim 8, characterized in that: In the above S7, the surface of each carbon fiber sheet of the fence-shaped carbon fiber (6) is scraped and pressed from the middle to both sides until the adhesive seeps out, so as to remove bubbles and ensure that the adhesive fully infiltrates the carbon fiber sheet; this step is repeated layer by layer when multiple layers are pasted.

10. The reinforcement method according to claim 9, characterized in that: After S8, prevent rain or moisture within 24 hours after the construction is completed, and prevent hard objects from damaging the construction surface. The curing and maintenance time shall not be less than the specified number of days.

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