Carbon fiber plate anchoring device with concave surface

Abstract

The present invention relates to the technical field of anchoring and relates to a carbon fiber plate anchoring device with a concave surface. The carbon fiber plate anchoring device with the concave surface comprises an anchor base and an anchor block, wherein a slot is provided in the anchor base, the slot has a shape matching with that of the anchor block and is configured for inserting the anchor block, the anchor block is configured as a compression portion on one side for fitting with an inner side wall of the slot, and is configured as a contact portion on the other side for fitting with a carbon fiber plate, and the cross section of the compression portion is a concave surface that is lower in the middle and higher at both ends. In the present application, cooperation between the components alters the force transmission mechanisms between the anchor block and the anchor base, and between the anchor block and the carbon fiber plate. During loading, the central part of the anchor block bears a higher stress and is less likely to bulge, thereby preventing stress concentration at two ends of the carbon fiber plate and instead concentrating the stress more in the central part of the anchor block. Moreover, the overall stress is dispersed toward two ends of the anchor block, resulting in a more uniform stress distribution on the carbon fiber plate, and a better anchoring effect of the anchoring device.

Description

A carbon fiber plate anchoring device with a concave surface Technical Field

[0001] The present application relates to the field of anchoring technology, and in particular to a carbon fiber plate anchoring device with a concave surface. Background Art

[0002] Traditional civil engineering often uses steel strands as reinforcement, but steel, as a metal material, is subject to corrosion. Corrosion causes cross-sectional loss, resulting in a decrease in bearing capacity and posing a safety hazard to the structure. To address this issue, researchers have employed methods such as surface coating and cathodic protection, but none of these methods can fundamentally prevent steel corrosion. Carbon fiber materials, with their excellent corrosion resistance, have seen increasing use in recent years.

[0003] Prestressed carbon fiber plate reinforcement has become a new favorite in external prestressed reinforcement due to its advantages such as active reinforcement and excellent corrosion resistance. For anchoring carbon fiber plates, wedge-shaped anchor blocks or flat anchor blocks are often used in conjunction with corresponding anchor bases. The anchor blocks are inserted into the anchor base, with one side contacting the inner wall of the anchor base and the other side contacting the end of the carbon fiber plate, thereby clamping the carbon fiber plate in the anchor base.

[0004] The cross-sections of common wedge-shaped anchor blocks and flat plate anchor blocks are rectangular or arched. When tensioning wide carbon fiber plates, the end areas of the wedge-shaped anchor blocks and flat plate anchor blocks are subjected to greater pressure, while the area near the central axis is subjected to less pressure, causing the middle part of the anchor block to easily arch, resulting in uneven stress distribution on the carbon fiber plate. The stress is concentrated at both ends of the carbon fiber plate, making the carbon fiber plate prone to splitting and damage. Summary of the Invention

[0005] In order to improve the problems existing in the above technology, the present application provides a carbon fiber plate anchoring device with a concave surface.

[0006] The present application provides a carbon fiber plate anchoring device with a concave surface, which adopts the following technical solution:

[0007] A carbon fiber plate anchoring device with a concave surface includes an anchor seat and an anchor block. The anchor seat is provided with a slot for inserting the anchor block. One side of the anchor block is a pressing portion that fits with the inner wall of the slot, and the other side is a contact portion that fits with the carbon fiber plate. The cross-section of the pressing portion is a concave surface with a low middle part and high two ends.

[0008] By adopting the above technical solution, when anchoring the carbon fiber plate, the end of the carbon fiber plate is extended into the slot from the front port of the slot, and then the end of the carbon fiber plate is covered with an anchor block, and then the anchor block is pushed into the slot from the rear port of the slot. The anchor block presses the end of the carbon fiber plate firmly into the slot, thereby completing the anchoring of the carbon fiber plate.

[0009] One side of the anchor block is a contact portion that fits with the carbon fiber plate, and the other side is a pressing portion that fits with the inner wall of the slot. Since the cross-section of the pressing portion is a concave surface with a low middle part and high two ends, this setting can change the force transmission method between the anchor block and the anchor seat, as well as between the anchor block and the carbon fiber plate. During the force-bearing process of the anchor block, the middle part of the anchor block is under greater pressure and is not prone to arching, thereby avoiding stress concentration at both ends of the carbon fiber plate, and more in the middle of the anchor block, and the entire force direction is dispersed toward both ends of the anchor block, so that the stress distribution on the carbon fiber plate is more uniform, and the anchoring effect of the anchoring device is better.

[0010] Optionally, two anchor blocks are provided, the two anchor blocks are arranged opposite to each other, and the carbon fiber plate is clamped between the two anchor blocks.

[0011] By adopting the above technical solution, the two anchor blocks work together to clamp the carbon fiber plate between the two anchor blocks, and the two anchor blocks act on both sides of the carbon fiber plate respectively, so that the forces on both sides of the carbon fiber plate can be balanced.

[0012] Optionally, the thickness of the anchor block gradually decreases from one end to the other end.

[0013] By adopting the above technical solution, when the end of the carbon fiber plate is fixed in the slot, the tension end of the carbon fiber plate is located on the side of the end with smaller thickness of the anchor block. The setting of the gradually decreasing thickness of the anchor block from one end to the other end enables the anchor block to lock the carbon fiber plate tighter and tighter when the carbon fiber plate is subjected to tension, thereby improving the anchoring effect of the anchoring device.

[0014] Optionally, anti-slip teeth are provided on the contact portion.

[0015] By adopting the above technical solution, the anti-slip gear is arranged on the contact part to increase the friction between the anchor block and the carbon fiber plate, thereby improving the stability of the carbon fiber plate end when it is located in the anchor seat and improving the anchoring effect.

[0016] Optionally, both ends of the pressing portion are mirror-imaged along the central axis of the anchor block.

[0017] By adopting the above technical solution, since the two ends of the pressing part are mirror-imaged along the central axis of the anchor block, the pressing part as a whole is symmetrically distributed around the central axis, thereby making the pressure on both sides of the anchor block balanced, thereby improving the uniformity of stress distribution on the carbon fiber plate.

[0018] Optionally, the cross section of the pressing portion transitions from a middle portion to two ends in a circular arc.

[0019] By adopting the above technical solution, since the cross-section of the pressing part transitions from the middle to the two ends in a circular arc, the height of the pressing part can change gradually and smoothly from the middle to the two ends. When the anchor block is under pressure, the pressure acting on the pressing part will not differ greatly in a certain area, thereby making the stress distribution on the carbon fiber plate more uniform.

[0020] Optionally, positioning steps are provided at both ends of the pressing portion.

[0021] By adopting the above technical solution, the positioning steps at both ends of the pressing part are used to position the anchor block in the slot, which facilitates the insertion of the anchor block into the slot, and the setting of the two positioning steps is conducive to the middle part of the pressing part with the lowest height being in the middle position of the anchoring device, avoiding the position of the middle part of the pressing part from being offset.

[0022] Optionally, a connection between the positioning step and the pressing portion is chamfered.

[0023] By adopting the above technical solution, the chamfered setting makes the connection between the positioning step and the pressing part present an arc transition, thereby avoiding the stress acting on the anchor block from suddenly dropping at the connection between the positioning step and the pressing part, thereby improving the uniformity of stress distribution on the anchor block.

[0024] In summary, this application includes at least one of the following beneficial technical effects:

[0025] 1. When anchoring the carbon fiber plate, extend the end of the carbon fiber plate into the slot from the front port of the slot, then use the anchor block to cover the end of the carbon fiber plate, and then push the anchor block into the slot from the rear port of the slot. The anchor block presses the end of the carbon fiber plate tightly into the slot, thereby completing the anchoring of the carbon fiber plate. One side of the anchor block is a contact portion that fits with the carbon fiber plate, and the other side is a pressing portion that fits with the inner wall of the slot. Since the cross-section of the pressing portion is a concave surface with a low middle part and high ends, this setting can change the force transmission method between the anchor block and the anchor seat, as well as between the anchor block and the carbon fiber plate, so that when the anchor block is subjected to force, the middle part of the anchor block is subjected to greater pressure and is not prone to arching, thereby avoiding stress concentration at both ends of the carbon fiber plate, but more concentrated in the middle of the anchor block, and the entire force direction is dispersed to both ends of the anchor block, so that the stress distribution on the carbon fiber plate is more uniform, and the anchoring effect of the anchoring device is better;

[0026] 2. When the ends of the carbon fiber plate are fixed in the slots, the tension end of the carbon fiber plate is located on one side of the front end of the anchor block. The thickness of the anchor block gradually decreases from the rear end to the front end. When the carbon fiber plate is subjected to tension, the anchor block can lock the carbon fiber plate more and more tightly, thereby improving the anchoring effect of the anchoring device.

[0027] 3. The anti-slip gear is provided on the contact portion to increase the friction between the anchor block and the carbon fiber plate, thereby improving the stability of the end of the carbon fiber plate when it is located in the anchor seat and improving the anchoring effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] FIG1 is a schematic diagram of the overall structure of a carbon fiber plate anchoring device with a concave surface in an embodiment of the present application;

[0029] FIG2 is a side view of an embodiment of the present application;

[0030] FIG3 is a cutaway side view of an embodiment of the present application;

[0031] FIG4 is a schematic diagram of an anchor block in an embodiment of the present application;

[0032] FIG5 is a schematic diagram of the state of the anchor seat under force in other embodiments.

[0033] Explanation of the accompanying drawings: 1. Anchor seat; 1a. Front end of anchor seat; 1b. Rear end of anchor seat; 2. Anchor block; 2a. Front end of anchor block; 2b. Rear end of anchor block; 3. Slot; 3a. Front port of slot; 3b. Rear port of slot; 4. Pressing part; 5. Contact part; 6. Positioning step; 7. Carbon fiber plate. DETAILED DESCRIPTION

[0034] The present application is further described in detail below with reference to Figures 1-5.

[0035] The embodiment of the present application discloses a carbon fiber plate anchoring device having a concave surface. Referring to Figures 1 and 2, the carbon fiber plate anchoring device having a concave surface includes an anchor seat 1 and two anchor blocks 2. The anchor seat 1 is provided with a slot 3 for simultaneously inserting two anchor blocks 2. One side of the anchor block 2 is a pressing portion 4 that fits with the inner wall of the slot 3, and the other side is a contact portion 5 that fits with the carbon fiber plate 7. The cross-section of the pressing portion 4 is a concave surface with a lower middle portion and higher ends. The two anchor blocks 2 are arranged opposite to each other, and the carbon fiber plate 7 is clamped between the two anchor blocks 2.

[0036] Referring to Figures 3 and 4, the anchor block 2 is wedge-shaped, with a thickness gradually decreasing from its rear end 2b to its front end 2a. The slot 3 is tapered, with a cross-section gradually decreasing from the rear end 1b of the anchor base to the front end 1a to accommodate the shape of the anchor block 2. To anchor the carbon fiber plate 7, the end of the carbon fiber plate 7 is inserted into the slot 3 from the front end 3a of the slot. The anchor block 2 then covers the end of the carbon fiber plate 7, and the anchor block 2 is then pushed into the slot 3 from the rear end 3b. The tension-bearing end of the carbon fiber plate 7 is located on the side of the front end 1a of the anchor base. The walls of the tapered slot 3 exert friction on the inclined surface of the anchor block 2, preventing the anchor block 2 from retracting. Simultaneously, the anchor block 2 exerts a compressive force on the carbon fiber plate 7, generating friction between the anchor block 2 and the carbon fiber plate 7. This allows the anchor block 2 to increasingly tighten against the carbon fiber plate 7 when subjected to tension, thereby enhancing the anchoring effectiveness of the anchoring device.

[0037] In an embodiment of the present application, the length of the anchor block 2 is equal to that of the anchor seat 1. When the anchor block 2 is inserted into the slot 3, the two end faces of the anchor block 2 and the two end faces of the anchor seat 1 are in the same plane; in other embodiments, the length of the anchor block 2 is slightly longer than the length of the anchor seat 1. When the anchor block 2 is inserted into the slot 3, the front end of the anchor block 2 slightly extends out of the slot 3, and a chamfer is provided on the side of the front end 2a of the anchor block close to the carbon fiber plate 7, thereby reducing the degree of shearing of the part extending from the tensile end of the carbon fiber plate 7, improving the notch effect, reducing the stress concentration at the end of the anchor block 2, and ensuring the uniformity of the anchor block 2 clamping the carbon fiber plate 7.

[0038] 2 and 3 , the contact portions 5 of the two anchor blocks 2 are both flat, with anti-slip teeth fixed on the contact portions 5. When the two anchor blocks 2 clamp the ends of the carbon fiber plate 7, the anti-slip teeth fit against the carbon fiber plate 7, thereby increasing the friction and mechanical engagement of the contact portions 5, effectively preventing the carbon plate from slipping and improving the stability of the carbon fiber plate 7 when the ends are located within the anchor seat 1.

[0039] In the embodiment of the present application, the anti-slip teeth are a plurality of transverse anti-slip teeth distributed along the width direction of the carbon fiber plate 7, and the plurality of transverse anti-slip teeth are parallel to each other and have the same size.

[0040] Referring to Figure 4, the cross section of the pressing part 4 transitions from the middle to the bottom arc of the positioning steps 6 at both ends, and the two ends of the pressing part 4 are mirrored along the central axis of the anchor block 2. Positioning steps 6 are provided at both ends of the pressing part 4, and the connection between the positioning steps 6 and the pressing part 4 is chamfered. The positioning steps 6 at both ends of the pressing part 4 are used to position the anchor block 2 in the slot 3, making it easier for the anchor block 2 to be inserted into the slot 3. The provision of the two positioning steps 6 facilitates the middle part of the pressing part 4, where the height is the lowest, to be in the middle of the anchoring device, thus avoiding the position of the middle part of the pressing part 4 from being offset. The chamfer can make the connection between the positioning step 6 and the pressing part 4 transition in an arc, thus avoiding the stress acting on the anchor block 2 from suddenly dropping at the connection between the positioning step 6 and the pressing part 4, thereby improving the uniformity of the stress distribution on the anchor block 2.

[0041] In other embodiments, referring to FIG5 , the cross section of the pressing portion 4 may transition directly from the middle to the arcs at both ends, so that the height of the pressing portion 4 always shows a gradual and gentle change trend from the middle to the two ends. When the anchor block 2 is under pressure, the pressure acting on the pressing portion 4 will not differ greatly in a certain area, thereby making the stress distribution on the carbon fiber plate 7 more uniform.

[0042] In the embodiment of the present application, two anchor blocks 2 are selected, and the two anchor blocks 2 work together to clamp the carbon fiber plate 7. In other embodiments, a single anchor block 2 can be used, with the pressing portion 4 on one side of the anchor block 2 abutting against the inner side wall of the upper side of the slot 3, and the contact portion 5 on the other side abutting against the carbon fiber plate 7. One side of the carbon fiber plate 7 abuts against the inner side wall of the lower side of the slot 3. The anchor block 2 presses the carbon fiber plate 7 tightly, and the anchor block 2 and the slot 3 work together to fix the carbon fiber plate 7 in the slot 3.

[0043] The implementation principle of a carbon fiber plate anchoring device with a concave surface in an embodiment of the present application is: when anchoring the carbon fiber plate 7, the end of the carbon fiber plate 7 is extended into the slot 3 from the front port 3a of the slot, and then the end of the carbon fiber plate 7 is covered with the anchor block 2, and then the anchor block 2 is pushed into the slot 3 from the rear port 3b of the slot. The anchor block 2 presses the end of the carbon fiber plate 7 into the slot 3, thereby completing the anchoring of the carbon fiber plate 7.

[0044] One side of the anchor block 2 is a contact portion 5 that fits with the carbon fiber plate 7, and the other side is a pressing portion 4 that fits with the inner wall of the slot 3. Since the cross-section of the pressing portion 4 is a concave surface with a low middle part and high two ends, such a setting can change the force transmission method between the anchor block 2 and the anchor seat 1 and between the anchor block 2 and the carbon fiber plate 7. During the force-bearing process of the anchor block 2, the middle part of the anchor block 2 is under greater pressure and is not prone to arching, thereby avoiding stress concentration at the two ends of the carbon fiber plate 7, but concentrating more in the middle of the anchor block 2, and the entire force direction is dispersed toward the two ends of the anchor block 2, so that the stress distribution on the carbon fiber plate 7 is more uniform, and the anchoring effect of the anchoring device is better.

[0045] Conventional anchors find it difficult to guarantee anchoring efficiency for thin and wide carbon fiber plates (100 mm wide × 1.4 mm thick). However, the carbon fiber plate anchoring device with a concave surface involved in this application can also guarantee an anchoring efficiency of more than 95% for thin and wide carbon fiber plates (100 mm wide × 1.4 mm thick).

[0046] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0047] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0048] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A carbon fiber plate anchoring device having a concave surface, characterized in that: The invention comprises an anchor seat (1) and an anchor block (2), wherein a slot (3) is provided on the anchor seat (1), and the slot (3) is used for inserting the anchor block (2); one side of the anchor block (2) is a pressing portion (4) that is in contact with the inner wall of the slot (3), and the other side is a contact portion (5) that is in contact with a carbon fiber plate (7); the cross section of the pressing portion (4) is a concave surface with a lower middle portion and higher ends.

2. The carbon fiber plate anchoring device with a concave surface according to claim 1, characterized in that: Two anchor blocks (2) are provided, the two anchor blocks (2) are arranged opposite to each other, and the carbon fiber plate (7) is clamped between the two anchor blocks (2).

3. The carbon fiber plate anchoring device with a concave surface according to claim 1, characterized in that: The thickness of the anchor block (2) gradually decreases from one end to the other end.

4. The carbon fiber plate anchoring device with a concave surface according to claim 1, characterized in that: The contact portion (5) is provided with anti-slip teeth.

5. The carbon fiber plate anchoring device with a concave surface according to claim 1, characterized in that: The two ends of the pressing portion (4) are mirror-imaged along the central axis of the anchor block (2).

6. The carbon fiber plate anchoring device with a concave surface according to claim 1, characterized in that: The cross section of the pressing portion (4) transitions from the middle portion to the arcs at both ends.

7. The carbon fiber plate anchoring device with a concave surface according to claim 1, characterized in that: Positioning steps (6) are provided at both ends of the pressing portion (4).

8. The carbon fiber plate anchoring device with a concave surface according to claim 7, characterized in that: The connection between the positioning step (6) and the pressing portion (4) is provided with a chamfer.

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