CFRP rib integral type clamping piece type anchorage device based on variable-width through seams and installation method of CFRP rib integral type clamping piece type anchorage device

Abstract

The invention discloses a CFRP rib integral type clamping piece type anchorage device based on variable-width through seams and an installation method, and relates to the technical field of civil engineering inhaul cable structures, the integral type clamping piece type anchorage device comprises an anchor ring, and a variable-cross-section cylindrical through hole is formed in the inner side of the anchor ring; the integral clamping piece is inserted into the variable-cross-section cylindrical through hole in the anchor ring, the integral clamping piece is a variable-cross-section cylinder, the inclination angle of the outer side of the integral clamping piece is larger than that of the variable-cross-section cylindrical through hole in the anchor ring, and a cylindrical through hole used for inserting a CFRP rib is formed in the integral clamping piece. The integral clamping piece is axially provided with a variable-width through seam and an equal-width non-through seam, and the narrower end of the variable-width through seam is communicated with the cylindrical through hole. According to the invention, the problems that the CFRP rib is suddenly pulled out and cannot be standardized under the action of high stress of the integral clamping piece anchorage device for the CFRP rib are solved, and the application stability of the integral clamping piece anchorage device for the CFRP rib is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of civil engineering cable structures, and in particular relates to a CFRP bar integral clip-type anchor based on a variable-width through-slit and an installation method. Background Art

[0002] Carbon fiber reinforced polymer (CFRP) has excellent mechanical, physical and chemical properties such as light weight, high strength, corrosion resistance, fatigue resistance and low temperature deformation, and is widely considered to be an ideal material for making cable components. Currently, CFRP cables have been used in cable roof structures, but the typical orthotropic mechanical properties of CFRP cables make it difficult to anchor them efficiently, which also hinders the widespread application of CFRP cables.

[0003] In order to solve the problem of difficult anchoring, low anchoring efficiency and poor anchoring stability of CFRP bars, researchers have developed an integral clip anchor with small size, light weight and easy installation. It solves the problem of the clip not being able to move synchronously in the separate clip anchor and realizes efficient anchoring of CFRP bars. However, there are two hidden dangers in the application of the integral clip anchor: first, the anchoring stability is poor. In the static tensile test, the integral clip type anchor system will have a failure mode of sudden pullout of the CFRP bar under high stress. This is because the deformation capacity of the integral clip is affected by the width of the gap of the through seam. When the gap width is too large, the gap edge will cause damage to the CFRP bar, and when the gap width is too small, the gap will close, resulting in the loss of the clip's clamping force on the CFRP bar. Finally, the bar is pulled out of the clip. The appropriate gap width is difficult to grasp, which leads to poor stability of the anchor in application; second, for CFRP bars of different diameters, the appropriate gap width of the clip is different, which also makes it impossible to standardize the anchor design, reducing its economic applicability. Summary of the invention

[0004] The present invention proposes an integral clip anchor based on a variable width design of a through-slit. By designing the width of the through-slit on both sides of the integral clip, it can prevent the CFRP tendons from being squeezed and damaged by the edges of the gap, and ensure that the clips have sufficient deformation capacity to avoid losing their clamping force. The problem of the CFRP tendon integral clip anchor being suddenly pulled out under high stress and the problem of the inability to standardize are solved, the stability of the application of the CFRP tendon integral clip anchor is improved, and the use of CFRP tendons in civil engineering cable structures is promoted.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] The CFRP bar integral clip-type anchor based on variable width through-slit includes:

[0007] An anchor ring, wherein a cylindrical through hole with a variable cross-section is provided on the inner side of the anchor ring;

[0008] An integral clip, the integral clip is inserted into a variable-section cylindrical through hole inside the anchor ring, the integral clip is a variable-section cylinder, the outer inclination angle of the integral clip is greater than the inclination angle of the variable-section cylindrical through hole inside the anchor ring, a cylindrical through hole for inserting CFRP bars is provided inside the integral clip, a variable-width through seam and a non-through seam of equal width are axially provided on the integral clip, and the narrower end of the variable-width through seam is connected to the cylindrical through hole;

[0009] Preferably, the inner gap width of the variable-width through-slit is in the range of 0.6-1.2 mm, and the outer gap width is in the range of 2-4 mm; the width of the equal-width non-through-slit is 1 mm.

[0010] Preferably, the inner gap width of the variable-width through-slit is 0.9 mm, and the outer gap width is 3 mm; the width of the equal-width non-through-slit is 1 mm.

[0011] Preferably, the inclination angle of the variable-section cylindrical through hole is in the range of 3°-4°, and the outer inclination angle of the integral clip is in the range of 3°-4°; the angle difference between the inclination angle of the variable-section cylindrical through hole and the outer inclination angle of the integral clip is in the range of 0.1°-0.3°.

[0012] Preferably, the inclination angle of the variable-section cylindrical through hole is 3°, and the outer side inclination angle of the integral clip is 3.2°.

[0013] Preferably, one variable-width through seam is provided, and two or three equal-width non-through seams are provided.

[0014] Preferably, a raised thread is provided at the tail of the cylindrical through hole.

[0015] The installation method of the CFRP bar integral clip-type anchor based on the variable width through-slit comprises the following steps:

[0016] S1. Apply a thin layer of fast-curing epoxy resin glue to the reinforcement anchorage area;

[0017] S2. Insert the CFRP rib into the cylindrical through hole of the integral clip;

[0018] S3. Finally, a pre-tightening force of 120 kN is applied to send the integral clip into the variable-section cylindrical through hole of the anchor ring.

[0019] Preferably, the integral clip-type anchor can be used for CFRP bars with a diameter of 3 mm-20 mm.

[0020] Beneficial effects of the present invention:

[0021] The present invention proposes an integral clip anchor based on a through-slit variable width design. By setting the through-slit of the integral clip as a variable width slot, the CFRP tendons are prevented from being squeezed and damaged by the slot edge, and the integral clip is ensured to have sufficient deformation capacity to avoid losing its clamping force. The problem of the CFRP tendon integral clip anchor being suddenly pulled out under high stress and the problem of the inability to standardize the CFRP tendon integral clip anchor is solved, the stability of the application of the CFRP tendon integral clip anchor is improved, and the use of CFRP tendons in civil engineering cable structures is promoted. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] For ease of explanation, the present invention is described in detail with reference to the following specific implementations and the accompanying drawings.

[0023] Figure 1 This is a schematic diagram of the assembly of the integral clip and the anchor ring of this embodiment;

[0024] Figure 2 This is a schematic diagram of the structure of the integral clip of this embodiment;

[0025] Figure 3 It is a side view of the integral clip of this embodiment.

[0026] In the figure:

[0027] 100-anchor ring; 110-variable cross-section cylindrical through hole;

[0028] 200 - integral clip; 210 - cylindrical through hole; 220 - variable width through seam; 230 - equal width non-through seam. DETAILED DESCRIPTION

[0029] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments; in the following description, specific details such as specific configurations and components are provided only to help fully understand the embodiments of the present invention. Therefore, it should be clear to those skilled in the art that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present invention. In addition, for the sake of clarity and brevity, the description of known functions and structures is omitted.

[0030] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features of the embodiments may be combined with each other.

[0031] Embodiment 1

[0032] like Figure 1-Figure 3As shown, the CFRP bar integral clip-type anchor based on the variable width through-slit provided in this embodiment includes: an anchor ring 100 and an integral clip 200, wherein the anchor ring 100 is made of steel, the outer contour of the anchor ring 100 is a cylinder of equal diameter, and a cylindrical through hole 110 with a variable cross-section is arranged on the inner side of the anchor ring 100; the integral clip 200 is made of aluminum, the integral clip 200 is inserted into the cylindrical through hole 110 with a variable cross-section inside the anchor ring 100, the integral clip 200 is a cylinder with a variable cross-section, the outer inclination angle of the integral clip 200 is greater than the inclination angle of the cylindrical through hole 110 with a variable cross-section inside the anchor ring 100, the inclination angle range of the cylindrical through hole 110 with a variable cross-section is 3°-4°, and the integral clip 200 is made of aluminum. 0 has an outer inclination angle of 3°-4°, and the angle difference between the inclination angle of the variable-section cylindrical through hole 110 and the outer inclination angle of the integral clip 200 is in the range of 0.1°-0.3°; a cylindrical through hole 210 for inserting CFRP ribs is provided inside the integral clip 200, and a raised thread is provided at the tail of the cylindrical through hole 210; the integral clip 200 is axially provided with a variable-width through seam 220 and two equal-width non-through seams 230, and the narrower end of the variable-width through seam 220 is connected to the cylindrical through hole 210, the inner gap width of the variable-width through seam 220 is in the range of 0.6-1.2mm, the outer gap width is in the range of 2-4mm, and the width of the equal-width non-through seam 230 is 1mm.

[0033] The installation method of the CFRP bar integral clip-type anchor based on the variable width through-slit is as follows:

[0034] S1. Apply a thin layer of fast-curing epoxy resin glue to the reinforcement anchorage area;

[0035] S2. The CFRP ribs are inserted into the cylindrical through hole 210 of the integral clip 200;

[0036] S3. Finally, a pre-tightening force of 120 kN is applied to send the integral clip 200 into the variable-section cylindrical through hole 110 of the anchor ring 100 .

[0037] The integral clip-type anchor of this embodiment can be used for CFRP bars with a diameter of 3mm-20mm. The installation method is simple, the operation is easy, and the construction efficiency is improved.

[0038] The numerical range of the inclination angle of the variable-section cylindrical through hole 110 and the outer side inclination angle of the integral clip 200 in this embodiment is obtained through numerical simulation test. The angle and the preload force cooperate with each other. When the angle is large, the preload force is small, and when the angle is small, the preload force is large. If the preload force is small, the integral clip will move after the reinforcement is stretched, and the more it moves, the more unstable it is. The numerical range of the inclination angle of the variable-section cylindrical through hole and the outer side inclination angle of the integral clip set in this embodiment, combined with the preload force, makes the anchoring in a more stable state and the anchoring performance more reliable.

[0039] The through-slit of the integral clip of the present embodiment adopts a variable width design. The side of the variable width through-slit 220 in contact with the CFRP tendon adopts a smaller gap width to ensure that the gap edge does not squeeze the CFRP tendon, while the side of the variable width through-slit 220 in contact with the anchor ring 100 adopts a larger gap width to ensure that the gap does not close during the deformation of the clip. The variable width design of the through-slit solves the problem of poor stability of the integral clip anchor in application. At the same time, this design also solves the design problem that CFRP tendons of different diameters need to correspond to through-slits of different widths, thereby realizing the standardized design of the integral clip anchor, which can be used to clamp CFRP tendons with diameters of 3 mm to 20 mm.

[0040] Embodiment 2

[0041] The difference between this embodiment and the first embodiment is that the inner gap width of the variable width through slit 220 is 0.9 mm, the outer gap width is 3 mm, and the width of the equal width non-through slit 230 is 1 mm; the inclination angle of the variable cross-section cylindrical through hole 110 is 3°, and the outer inclination angle of the integral clip 200 is 3.2°.

[0042] The values ​​of the inclination angle of the variable-section cylindrical through hole 110 and the outer inclination angle of the integral clip 200 of this embodiment are the optimal values ​​obtained through numerical simulation tests. The angle and the preload force cooperate with each other, making the anchoring force more stable, the anchoring force larger, and the anchoring performance of the anchor more reliable. The values ​​of the inner and outer gap widths of the variable-width through slit 220 are also the optimal values ​​obtained through numerical simulation tests.

[0043] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0044] In the description of the present application, it should be understood that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0045] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0046] Those skilled in the art to which the present application belongs may make various modifications or additions to the described specific embodiments or replace them in a similar manner, but they will not deviate from the spirit of the present application or exceed the scope defined by the attached claims.

Claims

1. CFRP bar integral clip-type anchor based on variable width through-slit, characterized in that: include: An anchor ring (100), wherein a cylindrical through hole (110) with a variable cross-section is provided on the inner side of the anchor ring (100); An integral clip (200), the integral clip (200) being inserted into a variable-section cylindrical through hole (110) inside an anchor ring (100), the integral clip (200) being a variable-section cylinder, the outer inclination angle of the integral clip (200) being greater than the inclination angle of the variable-section cylindrical through hole (110) inside the anchor ring, the integral clip (200) being provided with a cylindrical through hole (210) for inserting CFRP bars, the integral clip (200) being axially provided with a variable-width through seam (220) and a non-through seam (230) of equal width, the narrower end of the variable-width through seam (220) being connected to the cylindrical through hole (210).

2. The CFRP bar integral clip-type anchor based on variable width through-slit according to claim 1, characterized in that: The variable-width through-slit (220) has an inner gap width ranging from 0.6 to 1.2 mm, and an outer gap width ranging from 2 to 4 mm; the uniform-width non-through-slit (230) has a width of 1 mm.

3. The CFRP bar integral clip-type anchor based on variable width through-slit according to claim 1 or 2, characterized in that: The variable-width through-slit (220) has an inner gap width of 0.9 mm and an outer gap width of 3 mm.

4. The CFRP bar integral clip-type anchor based on variable width through-slit according to claim 1, characterized in that: The inclination angle of the variable-section cylindrical through hole (110) is in the range of 3°-4°, and the outer side inclination angle of the integral clip (200) is in the range of 3°-4°; the angle difference between the inclination angle of the variable-section cylindrical through hole (110) and the outer side inclination angle of the integral clip (200) is in the range of 0.1°-0.3°.

5. The CFRP bar integral clip-type anchor based on variable width through-slit according to claim 1 or 4, characterized in that: The inclination angle of the variable-section cylindrical through hole (110) is 3°, and the outer side inclination angle of the integral clip (200) is 3.2°.

6. The CFRP bar integral clip-type anchor based on variable width through-slit according to claim 1, characterized in that: The variable-width through slit (220) is provided in one piece, and the equal-width non-through slits (230) are provided in two or three pieces.

7. The CFRP bar integral clip-type anchor based on variable width through-slit according to claim 1, characterized in that: A raised thread is provided at the rear of the cylindrical through hole (210).

8. The installation method of the CFRP bar integral clip-type anchor based on the variable width through-slit according to claim 1 is characterized in that: The steps of the installation method are: S1. Apply a thin layer of fast-curing epoxy resin glue to the reinforcement anchorage area; S2. Insert the CFRP rib into the cylindrical through hole (210) of the integral clip; S3. Finally, a pre-tightening force of 120 kN is applied to insert the integral clip (200) into the variable-section cylindrical through hole (110) of the anchor ring (100).

9. The installation method of the CFRP bar integral clip-type anchor based on the variable width through-slit according to claim 8, characterized in that: The integral clip-type anchor can be used for CFRP bars with a diameter of 3 mm to 20 mm.

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