A concrete inner sleeve type FRP bar anchoring device

Abstract

This invention discloses a concrete inner sleeve type FRP rebar anchoring device, comprising a hollow sleeve body, a positioning bracket, and an auxiliary support frame. The hollow sleeve body is a hollow cylinder with through holes at both ends. Rubber gaskets are installed at the through holes at both ends of the hollow sleeve body. A positioning bracket for supporting the hollow sleeve body is installed at the tail end of the hollow sleeve body. The auxiliary support frame is provided on the hollow sleeve body. This invention fully considers the characteristics of FRP rebar, such as low elastic modulus, weak bending and shear resistance, and weak bonding performance. The annular rib design significantly enhances the bonding performance between the sleeve body and the concrete. The rubber gaskets effectively alleviate stress concentration at the ends. The positioning bracket ensures accurate positioning of the rebar. The auxiliary support structure is reasonably designed to avoid initial deformation problems during rebar installation. It can effectively enhance the anchoring effect between FRP rebar and concrete within a limited anchoring space.

Description

Technical Field

[0001] This invention relates to the field of civil engineering technology, specifically to a concrete inner sleeve type FRP rebar anchoring device. Background Technology

[0002] Lightweight, high-strength, corrosion-resistant, and fatigue-resistant fiber-reinforced polymer (FRP) composites are an ideal material for achieving long lifespan, lightweight, high performance, and low cost throughout the entire life cycle of building structures. Applying FRP to the field of building engineering is an inevitable trend in the development of civil engineering disciplines and industries, and an inherent requirement for achieving the transformation and upgrading of the construction industry and building resilient cities.

[0003] FRP (fiberglass reinforced polymer) bars are composite materials made from resin as the matrix and high-performance fibers as reinforcement through a pultrusion process. They have attracted widespread attention due to their advantages such as low density, corrosion resistance, high tensile strength, and non-magnetic properties. However, FRP bars based on thermosetting resins cannot be bent or otherwise processed on-site, making it difficult to achieve good anchorage in concrete, especially for carbon fiber reinforced composite (CFRP) bars with tensile strengths as high as 2500 MPa. Therefore, developing convenient and practical FRP bar anchoring devices is an inevitable requirement for promoting the development and application of FRP-reinforced concrete structures.

[0004] Grouting sleeves combined with high-strength grouting materials are a typical method for enhancing anchorage. However, existing research shows that sleeve types suitable for traditional reinforcing bars often cannot directly meet the needs of FRP-reinforced concrete structures, and are prone to anchorage loss. Furthermore, due to the relatively low stiffness of FRP bars, the weight of the end grouting sleeve can easily cause initial deformation of the FRP bars during construction, affecting their performance. Therefore, this invention proposes a concrete inner sleeve type FRP bar anchorage device, aiming to solve the anchorage problem of FRP bars in concrete structures and improve their overall performance and reliability. Summary of the Invention

[0005] The purpose of this invention is to provide a concrete inner sleeve type FRP bar anchoring device to solve the problems in the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a concrete inner sleeve type FRP rebar anchoring device, comprising a hollow sleeve body, a positioning bracket, and an auxiliary support frame; the hollow sleeve body is a hollow cylinder with through holes at both ends, and rubber gaskets are installed at the through holes at both ends of the hollow sleeve body; a positioning bracket for supporting the hollow sleeve body is installed at the tail end of the hollow sleeve body; an auxiliary support frame is provided on the hollow sleeve body; the rubber gaskets isolate the FRP rebar from direct contact with the sleeve and alleviate the problem of stress concentration at the ends; the positioning bracket at the tail end of the sleeve body ensures accurate positioning of the FRP rebar, and the auxiliary support at the head supports the weight of the sleeve body and prevents the FRP rebar from undergoing initial bending deformation due to its own weight.

[0007] Preferably, the hollow sleeve body has a grouting port and a grout outlet at the top, and the hollow sleeve body is filled with grout after the FRP reinforcement is installed to enhance the internal anchoring performance of the sleeve.

[0008] Preferably, the inner and outer surfaces of the hollow sleeve body are each equipped with multiple annular ribs to enhance the bonding performance between the sleeve and the concrete.

[0009] Preferably, the spacing between adjacent annular ribs is 30-50 mm.

[0010] Preferably, when the rubber washer is installed at the through hole of the hollow sleeve body, the outer diameter of the rubber washer matches the inner diameter of the through hole of the hollow sleeve body, and the inner diameter of the rubber washer matches the outer diameter of the FRP rib.

[0011] Preferably, the positioning bracket includes a steel frame mesh and annular protrusions. The positioning bracket is equipped with multiple annular protrusions that correspond one-to-one with the hollow sleeve body. The annular protrusions are inserted into the tail of the hollow sleeve body to achieve precise positioning of the reinforcing bar, while ensuring that the bracket structure does not directly contact the FRP reinforcing bar to avoid affecting the reinforcing bar.

[0012] Preferably, the auxiliary support frame consists of a connecting rod and an arc-shaped clamp. Both ends of the connecting rod are equipped with arc-shaped clamps. The two arc-shaped clamps support the two adjacent hollow sleeve bodies. The auxiliary support frame connects the two adjacent upper and lower sleeves during construction and, together with the positioning bracket, bears the weight of the sleeve body, thus preventing the FRP reinforcement from undergoing initial bending deformation.

[0013] Preferably, the arc-shaped clamp is 250° arc-shaped, and the auxiliary support is only connected to the sleeve body and can be removed during concrete pouring.

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

[0015] 1. The device fully considers the characteristics of FRP reinforcement, such as low elastic modulus, weak bending and shear strength, and weak bonding performance. The ring rib design significantly enhances the bonding performance between the sleeve body and the concrete. The rubber gasket effectively alleviates the stress concentration at the ends. The positioning bracket ensures the accurate positioning of the reinforcement. The auxiliary support structure is reasonably designed to avoid the initial deformation problem during the reinforcement installation process. This device can effectively enhance the anchoring effect between FRP reinforcement and concrete within a limited anchoring space.

[0016] 2. While improving the anchorage performance of FRP bars, this device significantly alleviates anchorage problems caused by stress concentration and insufficient bonding. The optimized annular rib design enhances the bond performance between the sleeve and concrete, and the grouting port design improves the safety and reliability of the anchorage. The application of positioning brackets and auxiliary supports ensures the precise positioning and stability of the bars during installation and construction. This device is suitable for the anchorage needs of concrete components with FRP longitudinal bars in the diameter range of 10-20mm. It is not only applicable to FRP bar-related scientific research experiments but can also be widely used in engineering practice, providing an important anchorage solution for FRP bar reinforced concrete structures. Attached Figure Description

[0017] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0018] Figure 1 This is a schematic diagram of the structure of the present invention;

[0019] Figure 2 This is a cross-sectional view of the hollow sleeve body of the present invention after FRP reinforcement has been installed;

[0020] Figure 3 This is a schematic diagram of the positioning bracket of the present invention;

[0021] Figure 4 This is a structural schematic diagram of the hollow sleeve body and auxiliary support frame of the present invention;

[0022] Figure 5 This is a schematic diagram of the auxiliary support frame of the present invention.

[0023] In the figure: 1. FRP reinforcement; 2. Hollow sleeve body; 3. Positioning bracket; 4. Auxiliary support frame; 5. Rubber gasket; 6. Grouting port; 7. Grout outlet; 8. Annular rib; 31. Steel frame grid; 32. Annular protrusion; 41. Connecting rod; 42. Arc-shaped clamp. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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 a part of the embodiments of the present invention, not all of them. 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. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.

[0025] Please see Figure 1-2 In this embodiment of the invention, a concrete inner sleeve type FRP reinforcement anchoring device includes a hollow sleeve body 2, a positioning bracket 3, and an auxiliary support frame 4. The hollow sleeve body 2 is a hollow cylinder with through holes at both ends. Rubber washers 5 are installed at the through holes at both ends of the hollow sleeve body 2. The rubber washers 5 are made of high-strength elastic rubber and are located at both ends of the sleeve body 2 to isolate the FRP reinforcement from contact with the sleeve body, thereby mitigating the effect of stress concentration at the ends during lateral deformation. When the rubber washers 5 are installed at the through holes of the hollow sleeve body 2, the outer diameter of the rubber washers 5 matches the inner diameter of the through holes of the hollow sleeve body 2. The inner diameter of the rubber gasket 5 matches the outer diameter of the FRP reinforcement 1 to ensure the device's sealing and prevent grout leakage. A positioning bracket 3 is installed at the tail of the hollow sleeve body 2 to support it. An auxiliary support frame 4 is provided on the hollow sleeve body 2. A grouting port 6 and a grout outlet 7 are opened at the top of the hollow sleeve body 2. Grout is injected into the hollow sleeve body 2 after the FRP reinforcement 1 is installed. Multiple annular ribs 8 are installed on both the inner and outer surfaces of the hollow sleeve body 2, with a spacing of 30-50mm between adjacent annular ribs to enhance the bonding performance between the sleeve and the concrete.

[0026] like Figure 2 and 3 The positioning bracket 3 includes a steel frame mesh 31 and annular protrusions 32. The positioning bracket 3 is equipped with multiple annular protrusions 32 that correspond one-to-one with the hollow sleeve body 2. The annular protrusions 32 are inserted into the tail of the hollow sleeve body 2 to achieve precise positioning of the FRP reinforcement. The annular protrusions of the positioning bracket 3 are only connected to the sleeve body 2 and do not directly contact the FRP reinforcement.

[0027] like Figure 4 and 5The auxiliary support frame 4 consists of a connecting rod 41 and an arc-shaped clamp 42. Both ends of the connecting rod 41 are equipped with arc-shaped clamps 42. The two arc-shaped clamps 42 support two adjacent hollow sleeve bodies 2. The auxiliary support frame 4 connects the two adjacent upper and lower sleeves during construction and, together with the positioning bracket 3, bears the weight of the sleeve body 2, preventing the FRP reinforcement from undergoing initial bending deformation. The arc-shaped clamp 42 is 250° arc-shaped. The auxiliary support 4 is only connected to the sleeve body 2 and can be removed during concrete pouring.

[0028] The working principle of this invention is as follows: During use, firstly, the rubber gaskets 5 are assembled at both ends of the sleeve body 2, ensuring a good dimensional fit; then, the FRP reinforcement 1 is passed through the sleeve body 2 and the rubber gaskets 5, ensuring that the tail FRP reinforcement does not protrude from the rubber gaskets 5. After all the FRP reinforcements 1 are assembled with the sleeve body 2, the positioning bracket 3 is used to accurately position all the reinforcement materials, while the auxiliary support 4 is used to stabilize the adjacent sleeves; then, high-strength grout is injected through the grouting port 6 to fill the interior of the sleeve body 2. After the grout has hardened, the installation of the anchoring device is completed; depending on the structural application and stress requirements, the auxiliary support 4 can be removed before pouring concrete.

[0029] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A concrete inner sleeve type FRP rebar anchoring device, characterized in that: It includes a hollow sleeve body (2), a positioning bracket (3) and an auxiliary support frame (4); The hollow sleeve body (2) is a hollow cylinder with through holes at both ends. Rubber gaskets (5) are installed at the through holes at both ends of the hollow sleeve body (2). A positioning bracket (3) for supporting the hollow sleeve body (2) is installed at the tail end of the hollow sleeve body (2). An auxiliary support frame (4) is provided on the hollow sleeve body (2). The positioning bracket (3) includes a steel frame grid (31) and annular protrusions (32). The positioning bracket (3) is equipped with multiple annular protrusions (32) that correspond one-to-one with the hollow sleeve body (2). The annular protrusions (32) are inserted into the tail end of the hollow sleeve body (2). The auxiliary support frame (4) is composed of a connecting rod (41) and an arc-shaped clamp (42). Arc-shaped clamps (42) are installed at both ends of the connecting rod (41). The two arc-shaped clamps (42) support the two adjacent hollow sleeve bodies (2).

2. The concrete inner sleeve type FRP rebar anchoring device according to claim 1, characterized in that: The hollow sleeve body (2) has a grouting port (6) and a grout outlet (7) at the top. After the FRP reinforcement (1) is installed, the hollow sleeve body (2) is filled with grout.

3. The concrete inner sleeve type FRP rebar anchoring device according to claim 1, characterized in that: The hollow sleeve body (2) has multiple annular ribs (8) installed on both its inner and outer surfaces.

4. The concrete inner sleeve type FRP rebar anchoring device according to claim 3, characterized in that: The distance between adjacent annular ribs (8) is 30-50 mm.

5. The concrete inner sleeve type FRP rebar anchoring device according to claim 1, characterized in that: When the rubber washer (5) is installed at the through hole of the hollow sleeve body (2), the outer diameter of the rubber washer (5) matches the inner diameter of the through hole of the hollow sleeve body (2), and the inner diameter of the rubber washer (5) matches the outer diameter of the FRP rib (1).

6. The concrete inner sleeve type FRP rebar anchoring device according to claim 1, characterized in that: The arc-shaped clamp (42) has a 250° arc shape.

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