Round-rod-shaped tooth-shaped clamping plate anchorage device suitable for prestress FRP cloth material

Abstract

The utility model discloses a round-rod-shaped tooth-shaped clamping plate anchorage device suitable for prestress FRP cloth materials, which belongs to the technical field of civil engineering and composite materials, and is characterized by comprising an FRP cloth material structure, an upper semicircular rod tooth-shaped clamping plate, a bolt and a lower semicircular rod tooth-shaped clamping plate, the FRP cloth material structure is arranged between the upper semicircular rod tooth-shaped clamping plate and the lower semicircular rod tooth-shaped clamping plate, and the problem that the material characteristic limitation exists in the existing FRP reinforcing beam technology, that is, when FRP works together with reinforcing steel bars, it is difficult to give full play to the strength to restrain structural deformation and crack development is solved; fRP cloth material prestress reinforcement lacks effective tensioning construction and anchoring measures, and application in reinforcement engineering is limited; the problems that according to an existing anchoring system, an excessive stress peak value is easily generated at an anchorage device outlet due to the characteristics of FRP materials, so that the materials are damaged in advance, and the anchorage device is too long, too large in size, complex in structure and high in manufacturing cost due to the frequently-adopted measures such as increasing the anchoring length are solved.

Description

Technical Field

[0001] The utility model relates to the technical fields of civil engineering and composite materials, in particular to a round rod-shaped toothed splint anchor suitable for prestressed FRP cloth. Background Art

[0002] Fiber reinforced composite materials (FRP) are increasingly being used in civil engineering due to their advantages such as light weight, high strength, corrosion resistance, and good fatigue resistance. They are often used to reinforce concrete beams in building structures and bridge structures. Compared with the method of reinforcing concrete beams by gluing steel plates, FRP beam reinforcement technology can have the same reinforcement performance, and also has the advantages of easy transportation, convenient construction, and low subsequent maintenance costs. However, FRP beam reinforcement technology also has some disadvantages, namely, FRP materials can only fully exert their high strength characteristics when large deformation occurs. When working together with steel bars, when the steel bars fully exert their strength, FRP only exerts less than 20% of its strength, making it difficult to suppress the development of structural deformation and cracks. Pre-tensioning FRP before reinforcement can fully exert the high strength characteristics of FRP materials, thereby increasing the cracking load of the structure, suppressing the development of cracks and deformation, improving the performance of the components, and achieving better reinforcement effects.

[0003] FRP is an orthotropic material. Its strength and modulus perpendicular to the fiber direction are much smaller than those in the fiber direction. This usually generates excessive normal stress and shear stress peaks at the anchor outlet of the anchor system, causing premature damage to the FRP material. Therefore, FRP materials are not easy to anchor by clamping like steel. Existing anchoring systems at home and abroad usually adopt special structural measures such as increasing the anchor length and thickness, or using sheaths and adhesives. This will make the anchor too long, too large, complex, and costly.

[0004] The existing patent (publication number: CN114150581B) discloses an FRP sheet willow-shaped notched plywood anchor, including an FRP sheet, an upper willow-shaped notched plywood, and a lower willow-shaped notched plywood; the designed willow-shaped notches are perpendicular to the fiber direction of the FRP sheet, and the willow-shaped notches are alternately distributed. The depth and width of the willow-shaped notches gradually increase from the outlet to the end of the anchor, and the friction provided by the upper and lower plywood also gradually increases from the outlet to the end, which can effectively reduce the stress peak at the outlet of the anchor, give full play to the material properties, and increase the friction between the contact surfaces. Under the conditions of the same size and other conditions, this invention has an anchoring efficiency that is 28% higher than that of a plywood without willow-shaped notches on the active surface.

[0005] In response to the above problems, existing patents have provided solutions, but the existing FRP reinforced beam technology has material property limitations, that is, FRP is difficult to fully exert its strength to suppress structural deformation and crack development when working with steel bars; FRP cloth prestressed reinforcement lacks effective tensioning construction and anchoring measures, and its application in reinforcement projects is limited; and the existing anchoring system is prone to excessive stress peaks at the anchor outlet due to the characteristics of FRP materials, leading to premature material damage, and measures such as increasing the anchor length that are often used result in the anchor being too long, too large, complex in structure, and increasing the cost.

[0006] Therefore, a round rod-shaped toothed splint anchor suitable for prestressed FRP cloth is proposed. Utility Model Content

[0007] The purpose of the present utility model is to provide a round rod-shaped toothed splint anchor suitable for prestressed FRP cloth, which can solve the material property limitations of the existing FRP reinforced beam technology, namely, FRP is difficult to fully exert its strength to suppress structural deformation and crack development when working together with steel bars; FRP cloth prestressed reinforcement lacks effective tensioning construction and anchoring measures, and its application in reinforcement projects is limited; and the existing anchoring system is prone to excessive stress peaks at the anchor outlet due to the characteristics of FRP materials, resulting in premature damage to the material, and the commonly used measures such as increasing the anchoring length result in the problems of the anchor being too long, too large, complex in structure, and increased cost.

[0008] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a round rod-shaped toothed splint anchor suitable for prestressed FRP cloth, comprising an FRP cloth structure, an upper semi-circular rod toothed splint, a bolt and a lower semi-circular rod toothed splint, the FRP cloth structure being arranged between the upper semi-circular rod toothed splint and the lower semi-circular rod toothed splint, the plate surfaces of the upper semi-circular rod toothed splint and the lower semi-circular rod toothed splint are both tooth-shaped, the inner walls of the upper semi-circular rod toothed splint and the lower semi-circular rod toothed splint are both provided with mounting holes, the surface of the bolt is sleeved with a washer, the bottom of the bolt passes through the upper semi-circular rod toothed splint and extends to the inner wall of the lower semi-circular rod toothed splint, the surface of the bolt is threadedly connected with a first nut, the top of the first nut is in close contact with the bottom of the lower semi-circular rod toothed splint, and a turn head is provided on the left and right sides of the upper semi-circular rod toothed splint.

[0009] Preferably, the cross section of the rotor is a regular hexagon.

[0010] Preferably, the occlusal surface of the upper semi-circular rod toothed splint is composed of two concave teeth and one convex tooth, and the occlusal surface of the lower semi-circular rod toothed splint is composed of two convex teeth and one concave tooth.

[0011] Preferably, the upper semi-circular rod toothed splint and the lower semi-circular rod toothed splint are both made of rust-proof alloy.

[0012] Preferably, the inner walls of the upper semi-circular rod toothed splint and the lower semi-circular rod toothed splint are both provided with anchor holes, the inner walls of the anchor holes are provided with anchor rods, and the surfaces of the anchor rods are threadedly connected with second nuts.

[0013] Preferably, the second nut is made of an anti-loosening nut.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] The present application sets up an FRP cloth structure, an upper semi-circular rod toothed splint, bolts and a lower semi-circular rod toothed splint. When the toothed plate surfaces of the upper semi-circular rod toothed splint and the lower semi-circular rod toothed splint are in close contact with the FRP cloth structure, they will produce extremely strong mechanical bite effects, which greatly improves the gripping ability of the FRPFRP cloth structure. At the same time, the surface of the splint is roughened and coated with epoxy resin adhesive, which further strengthens the friction between the upper semi-circular rod toothed splint and the lower semi-circular rod toothed splint and the FRPFRP cloth structure, and exerts force from multiple aspects to enhance the anchoring force. In addition, the turning heads arranged on both sides of the upper semi-circular rod toothed splint can rotate the round rod extremely flexibly, so that the FRPFRP cloth structure can be accurately wrapped along the outer circumference of the round rod, thereby realizing the precise application of prestress. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is the overall structural diagram of the round rod-shaped toothed splint anchor suitable for prestressed FRP cloth of the present invention;

[0017] Figure 2 It is a front view of the partial structure of the utility model;

[0018] Figure 3 It is a cross-sectional view of the local structure of the utility model;

[0019] Figure 4 It is a top view of the local structure of the utility model.

[0020] In the figure, 1. FRP cloth structure; 2. Upper semicircular rod toothed splint; 3. Lower semicircular rod toothed splint; 4. Turnstile; 5. Bolt; 6. First nut; 7. Washer; 8. Anchor rod; 9. Second nut; 10. Anchor hole. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described 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 making creative efforts are within the scope of protection of the present invention.

[0022] See also Figure 1-4 , this utility model provides a technical solution:

[0023] A round rod-shaped toothed splint anchor suitable for prestressed FRP cloth, comprising an FRP cloth structure 1, an upper semi-circular rod toothed splint 2, a bolt 5 and a lower semi-circular rod toothed splint 3, the FRP cloth structure 1 being arranged between the upper semi-circular rod toothed splint 2 and the lower semi-circular rod toothed splint 3, the plate surfaces of the upper semi-circular rod toothed splint 2 and the lower semi-circular rod toothed splint 3 are both tooth-shaped, the inner walls of the upper semi-circular rod toothed splint 2 and the lower semi-circular rod toothed splint 3 are provided with mounting holes, the surface of the bolt 5 is sleeved with a washer 7, the bottom of the bolt 5 passes through the upper semi-circular rod toothed splint 2 and extends to the inner wall of the lower semi-circular rod toothed splint 3, the surface of the bolt 5 is threadedly connected with a first nut 6, the top of the first nut 6 is in close contact with the bottom of the lower semi-circular rod toothed splint 3, and a turn head 4 is provided on the left and right sides of the upper semi-circular rod toothed splint 2.

[0024] In this embodiment: by setting up the FRP cloth structure 1, the upper semi-circular rod toothed splint 2, the bolt 5 and the lower semi-circular rod toothed splint 3, the toothed plate surfaces of the upper semi-circular rod toothed splint 2 and the lower semi-circular rod toothed splint 3 form a strong mechanical bite effect when in close contact with the FRP cloth structure 1, thereby improving the gripping ability of the FRP cloth structure 1. At the same time, the surface of the splint is roughened and coated with epoxy resin adhesive, thereby further strengthening the friction between the upper semi-circular rod toothed splint 2 and the lower semi-circular rod toothed splint 3 and the FRP cloth structure 1, and enhancing the anchoring force from multiple aspects. By using the rotating head 4 arranged on both sides of the upper semi-circular rod toothed splint 2, the round rod can be flexibly rotated, so that the FRP cloth structure 1 is accurately wrapped along the outer circumference of the round rod, thereby realizing the precise application of prestress, and effectively avoiding the complexity and inaccuracy of traditional prestressing methods.

[0025] Specifically, such as Figure 1 、 Figure 4 As shown, the cross section of the rotor 4 is a regular hexagon.

[0026] Specifically, such as Figure 3 As shown, the occlusal surface of the upper semi-circular rod toothed splint 2 is two concave teeth and one convex tooth, and the occlusal surface of the lower semi-circular rod toothed splint 3 is two convex teeth and one concave tooth.

[0027] Specifically, such as Figure 2 As shown, the upper semi-circular rod toothed splint 2 and the lower semi-circular rod toothed splint 3 are both made of rust-proof alloy.

[0028] In this embodiment: the cross-section of the rotating head 4 is designed as a regular hexagon, which is convenient for operation with tools and can rotate the round rod more stably and efficiently, so that the FRPFRP cloth structure 1 is evenly stressed during the winding process, ensuring the precise application of prestress, and further enhancing the stability of the entire anchoring system. The upper semi-circular rod toothed splint 2 and the lower semi-circular rod toothed splint 3 have a specific tooth design, two concave teeth and one convex tooth and the occlusal surface of two convex teeth and one concave tooth, and the angle formed by the upper and lower horizontal edges of the occlusal section and the hypotenuse is 120°, and the horizontal lengths of the convex teeth and the concave teeth are equal, so that the bite between the teeth is tighter and more reasonable, and the mechanical bite effect is improved. It can more effectively resist the slip tendency of the FRPFRP cloth structure 1 when it is stressed, enhance the gripping ability of the FRPFRP cloth structure 1, and ensure the reliability of anchoring. The upper semi-circular rod toothed splint 2 and the lower semi-circular rod toothed splint 3 are made of rust-proof alloy. The rust-proof alloy has high strength and good toughness, can withstand greater anchoring force, and is not easy to deform or damage.

[0029] Specifically, such as Figure 1 、 Figure 2 、 Figure 3 As shown, the inner walls of the upper semi-circular rod toothed splint 2 and the lower semi-circular rod toothed splint 3 are both provided with anchor holes 10, the inner walls of the anchor holes 10 are provided with anchor rods 8, and the surfaces of the anchor rods 8 are threadedly connected with second nuts 9.

[0030] Specifically, such as Figure 2 As shown, the second nut 9 is made of an anti-loosening nut.

[0031] In this embodiment: anchor holes 10 are opened on the inner walls of the upper semi-circular rod toothed splint 2 and the lower semi-circular rod toothed splint 3 and the anchor rod 8 and the second nut 9 are arranged. After the winding and prestressing of the FRPFRP cloth structure 1 are completed, the anchor rod 8 is inserted into the anchor hole 10 and the second nut 9 is tightened to form an additional anchoring point. This double anchoring method can effectively prevent the loosening or slipping of the anchor due to various factors during use, improve the safety and reliability of the anchoring, and ensure that the FRPFRP cloth structure 1 always maintains a stable stress state in the reinforced structure. The use of the second nut 9 further enhances the tightness of the anchor connection and effectively avoids the loosening of the nut due to vibration and other reasons during long-term use.

[0032] Working principle: During the use of the FRP cloth structure 1, the upper semi-circular rod toothed splint 2, the bolts 5 and the lower semi-circular rod toothed splint 3, by setting the FRP cloth structure 1, the upper semi-circular rod toothed splint 2, the bolts 5 and the lower semi-circular rod toothed splint 3, the toothed plate surfaces of the upper semi-circular rod toothed splint 2 and the lower semi-circular rod toothed splint 3 form a strong mechanical bite effect when in close contact with the FRP cloth structure 1, thereby improving the gripping ability of the FRP cloth structure 1. At the same time, the surface of the splint is roughened and coated with epoxy resin adhesive, further strengthening the upper semi-circular rod toothed splint 2 and the lower semi-circular rod toothed splint 3 and the FRP cloth structure 1. The friction between the RP cloth structure 1 works together from multiple aspects to enhance the anchoring force. The rotating heads 4 arranged on both sides of the upper semi-circular rod toothed splint 2 can flexibly rotate the round rod, so that the FRPFRP cloth structure 1 can be accurately wrapped along the outer circumference of the round rod, thereby realizing the precise application of prestress, effectively avoiding the complexity and inaccuracy of traditional prestressing methods. Furthermore, the anchor holes 10 arranged near the ends of the upper semi-circular rod toothed splint 2 and the lower semi-circular rod toothed splint 3 near the rotating head 4 can perfectly cooperate with the pre-installed anchor rods 8 pre-implanted in the beam, successfully solving the problems of bonding layer peeling and prestress failure that are prone to traditional adhesive anchoring.

[0033] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A round rod toothed splint anchor suitable for prestressed FRP cloth, comprising an FRP cloth structure (1), an upper semi-round rod toothed splint (2), a bolt (5) and a lower semi-round rod toothed splint (3), characterized in that: The FRP cloth structure (1) is arranged between an upper semicircular rod toothed splint (2) and a lower semicircular rod toothed splint (3); the plate surfaces of the upper semicircular rod toothed splint (2) and the lower semicircular rod toothed splint (3) are both tooth-shaped; the inner walls of the upper semicircular rod toothed splint (2) and the lower semicircular rod toothed splint (3) are both provided with mounting holes; a washer (7) is sleeved on the surface of the bolt (5); the bottom of the bolt (5) passes through the upper semicircular rod toothed splint (2) and extends to the inner wall of the lower semicircular rod toothed splint (3); the surface of the bolt (5) is threadedly connected with a first nut (6); the top of the first nut (6) is in close contact with the bottom of the lower semicircular rod toothed splint (3); and a turn head (4) is provided on the left and right sides of the upper semicircular rod toothed splint (2).

2. A round rod-shaped toothed clamp anchor suitable for prestressed FRP cloth according to claim 1, characterized in that: The cross section of the rotor (4) is a regular hexagon.

3. The round rod-shaped toothed clamp anchor for prestressed FRP cloth according to claim 1, characterized in that: The occlusal surface of the upper semi-circular rod toothed splint (2) comprises two concave teeth and one convex tooth, and the occlusal surface of the lower semi-circular rod toothed splint (3) comprises two convex teeth and one concave tooth.

4. The round rod-shaped toothed clamp anchor for prestressed FRP cloth according to claim 1, characterized in that: The upper semi-circular rod toothed splint (2) and the lower semi-circular rod toothed splint (3) are both made of rust-proof alloy.

5. The round rod-shaped toothed clamp anchor for prestressed FRP cloth according to claim 1, characterized in that: The inner walls of the upper semi-circular rod toothed splint (2) and the lower semi-circular rod toothed splint (3) are both provided with anchor holes (10), the inner walls of the anchor holes (10) are provided with anchor rods (8), and the surfaces of the anchor rods (8) are threadedly connected with second nuts (9).

6. The round rod-shaped toothed clamp anchor for prestressed FRP cloth according to claim 5, characterized in that: The second nut (9) is made of an anti-loosening nut.

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