FRP plate prestress tensioning device
By designing the FRP plate prestressing tensioning device, the support arm and the middle hinge structure are used to connect the jack and the anchor, the problem of eccentric stress of the jack is solved, and the uniform stress and safe reinforcement of the FRP plate are achieved, and the construction safety and reinforcement range are improved.
Patent Information
- Application Number
- CN202422239469.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-12
- Publication Date
- 2025-08-05
- Estimated Expiration
- 2034-09-12
AI Technical Summary
During the prestressing tensioning process of existing FRP plates, the jack has eccentric stress problems, which leads to construction safety hazards and affects the prestressing tensioning effect.
A FRP plate prestressed tensioning device is adopted to connect the jack and the anchor through the support arm and the middle hinge structure to ensure that the jack is subjected to force along the central axis, avoid eccentric force, and use the hinge and nut to transmit torque to achieve uniform force.
Ensure that FRP prestressing tension is not eccentric, improve the working stability of the jack, extend the service life, reduce construction risks, and expand the reinforcement range to avoid insufficient space for the bottom tensioning of the beam.
Smart Images
Figure CN223190107U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of geotechnical engineering structure reinforcement, in particular to an FRP plate prestressed tensioning device. Background Art
[0002] FRP panels are rigid sheets made by impregnating fiber materials with resin and then pultruding them. They offer advantages such as lightness, high strength, and corrosion resistance, making them commonly used in engineering reinforcement. Prestressed FRP panel external bonding reinforcement technology involves attaching prestressed FRP panels to the tensile side of the concrete structure to be reinforced using adhesives such as epoxy resin. This effectively improves the performance of the structure during its service life, fully utilizing the material properties of both concrete and FRP. It offers advantages such as resistance to peeling and fatigue damage, and has therefore found widespread application in the reinforcement of structures such as bridges.
[0003] To prevent FRP sheet delamination and ensure prestressing, mechanical anchors are required at both ends of the FRP sheet. Common mechanical anchors are 5 to 10 cm thick, while the diameter of the jack is often 20 cm, with higher-tonnage jacks having even larger diameters. The height difference between the jack's centerline and the FRP sheet-anchor centerline is significant. Consequently, existing tensioning methods suffer from eccentric loading of the jack, hindering the jack's full tensioning capacity and posing a significant safety risk during construction. Utility Model Content
[0004] In order to make up for the deficiencies of the prior art, the utility model provides an FRP plate prestressing tensioning device which has a simple structure, is easy to operate, has reliable performance and avoids prestressing tensioning eccentricity.
[0005] The utility model is achieved through the following technical solutions:
[0006] A FRP plate prestressing tensioning device includes an FRP plate, the end of the FRP plate is anchored in an anchor, and is characterized in that: the anchor is connected to the bottom of a first support arm, the top of the first support arm is connected to the top of a second support arm via a hinge, the bottom of the second support arm is connected to a fixed support, a first middle hinge is provided in the middle of the first support arm, a second middle hinge is provided in the middle of the second support arm, a first screw is passed through the second middle hinge, the second support arm, the first support arm and the first middle hinge, a jack is passed through the first screw on one side of the first middle hinge, and first nuts are installed at both ends of the first screw.
[0007] The bottom of the first support arm is connected to a first bottom hinge, which is fixed to an anchor; the bottom of the second support arm is connected to a second bottom hinge, which is fixed to a fixed support.
[0008] The fixed support is connected to the second screw rod, and second nuts are respectively installed at both ends of the second screw rod.
[0009] A steel pad is provided between the jack and the first nut.
[0010] The beneficial effects of the present invention are: ensuring that the FRP prestressing is not eccentric and the jack does not arch, thereby ensuring the stable working performance of the jack and extending its service life, while also reducing the danger during prestressing; it is not affected by the distance between the tail of the anchor and vertical components such as the pier, and can extend the range of FRP plate reinforcement, effectively avoiding the problem of insufficient tensioning space at the bottom of the beam; it has a simple structure, easy operation, reliable performance, and effectively realizes the tensioning of prestressed FRP. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] The present invention will be further described below with reference to the accompanying drawings.
[0012] Attachment Figure 1 It is a structural diagram of the utility model;
[0013] In the figure, 1 is FRP plate, 2 is anchor, 3 is first support arm, 4 is hinge, 5 is second support arm, 6 is fixed support, 7 is first middle hinge, 8 is second middle hinge, 9 is first screw, 10 is jack, 11 is first nut, 12 is first bottom hinge, 13 is second bottom hinge, 14 is second screw, 15 is second nut, and 16 is steel pad. DETAILED DESCRIPTION
[0014] The accompanying drawings illustrate a specific embodiment of the present invention. This embodiment comprises an FRP plate 1, the end of which is anchored within an anchor 2, which is connected to the bottom of a first support arm 3. The top of the first support arm 3 is connected to the top of a second support arm 5 via a hinge 4. The bottom of the second support arm 5 is connected to a fixed support 6. A first central hinge 7 is provided in the middle of the first support arm 3, and a second central hinge 8 is provided in the middle of the second support arm 5. A first screw 9 is inserted through the second central hinge 8, the second support arm 5, the first support arm 3, and the first central hinge 7. A jack 10 is inserted through the first screw 9 on one side of the first central hinge 7, and first nuts 11 are mounted on both ends of the first screw 9.
[0015] The bottom of the first support arm 3 is connected to a first bottom hinge 12, which is fixed to the anchor 2. The bottom of the second support arm 5 is connected to a second bottom hinge 13, which is fixed to the fixed support 6. The fixed support 6 is connected to a second screw rod 14, and second nuts 15 are installed at each end of the second screw rod 14. A steel plate 16 is installed between the jack 10 and the first nut 11.
[0016] In the FRP plate prestressing tensioning device of the present invention, the first support arm 3 and the second support arm 5 are connected by a hinge 4 to form a hinge structure. The first middle hinge 7 and the second middle hinge 8 have the same structure, both being solid hemispherical structures with a circular hole in the middle. Their arcuate surfaces contact the arcuate concave surfaces on the first support arm 3 or the second support arm 5 and can rotate freely. They are used to transmit the force of the jack 10 and automatically adjust the position when the jack 10 is subjected to eccentric force, ensuring that the jack 10 is always subjected to force along the central axis. The first middle hinge 7 and the second middle hinge 8 transmit the top pressure of the jack 10 to the first support arm 3 and the second support arm 5, ensuring that the first screw 9 is subjected to horizontal force and preventing it from bending or bending. The first bottom hinge 12 and the second bottom hinge 13 have the same structure, which is a solid semi-cylindrical structure, used to provide a fixed surface for clamping the anchor 2 or the fixed support 6, ensuring that during the tensioning process, the contact surface of the tensioning device is always tightly fitted with the contact surface of the anchor 2 and the fixed support 6, ensuring that the anchor 2 is subjected to axial force along the FRP plate 1, avoiding the anchor 2 from warping due to eccentric force, and ensuring the safety of prestressed tensioning.
[0017] Using the FRP plate prestressing device of the present invention, pre-tension by 20%. Check the working status of each component. After confirming that there are no abnormal sounds and that each component is functioning normally, unload and re-tension in stages, holding each load level for 5 to 10 minutes. During the staged tensioning process, tighten the two second nuts 15 on the fixed support 6 at any time to reduce prestress loss. After tensioning to the designed prestress level, over-tension by 5%, tighten the two second nuts 15 on the fixed support 6 again, unload the jack 10, and remove the tensioning device. At this point, the prestressing of the FRP plate 1 is completed.
Claims
1. A FRP plate prestressing tensioning device, comprising an FRP plate (1), wherein the end of the FRP plate (1) is anchored in an anchor (2), and wherein: The anchor (2) is connected to the bottom of the first support arm (3), the top of the first support arm (3) is connected to the top of the second support arm (5) through a hinge (4), the bottom of the second support arm (5) is connected to the fixed support (6), a first middle hinge (7) is provided in the middle of the first support arm (3), a second middle hinge (8) is provided in the middle of the second support arm (5), a first screw (9) is passed through the second middle hinge (8), the second support arm (5), the first support arm (3) and the first middle hinge (7), a jack (10) is passed through the first screw (9) on one side of the first middle hinge (7), and first nuts (11) are installed at both ends of the first screw (9).
2. The FRP plate prestressing tensioning device according to claim 1, characterized in that: The bottom of the first support arm (3) is connected to a first bottom hinge (12), and the first bottom hinge (12) is fixed to the anchor (2); the bottom of the second support arm (5) is connected to a second bottom hinge (13), and the second bottom hinge (13) is fixed to the fixed support (6).
3. The FRP plate prestressing tensioning device according to claim 1, characterized in that: The fixed support (6) is connected to the second screw rod (14), and second nuts (15) are respectively installed at both ends of the second screw rod (14).
4. The FRP plate prestressing tensioning device according to claim 1, characterized in that: A steel backing plate (16) is provided between the jack (10) and the first nut (11).