Carbon fiber plate prestress tensioning device

Abstract

The invention discloses a carbon fiber plate prestress tensioning device, and relates to the technical field of building structure reinforcement. Comprising a fixed bottom plate and a fixed clamp, and the fixed clamp is rotationally connected with the fixed bottom plate; the movable clamp and the fixed clamp are oppositely arranged, the movable bottom plate is arranged on the side, away from the fixed clamp, of the movable clamp and fixed to the cambered surface structure, a fixed block and a steering block are arranged on the movable bottom plate, and the movable clamp is rotationally connected with the movable stop block; the steel cable sequentially penetrates through the movable check block, the fixed block, the steering block and the counter-force plate, and the tension piece is connected between the steering block and the counter-force plate. And the multiple clamping plates are sequentially arranged between the fixed clamp and the movable clamp, and the multiple clamping plates are all connected with the cambered surface structure. According to the carbon fiber plate prestress tensioning device, it is guaranteed that the carbon fiber plate is attached to a cambered surface structure, and the application effect of the carbon fiber plate in the cambered surface structure and the complex structure is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of building structure reinforcement, and more particularly to a carbon fiber plate prestressing tensioning device. Background Art

[0002] With the widespread application of prestressed carbon fiber plate (CFRP) reinforcement technology, especially in the reinforcement of building structures and infrastructure, this technology has become one of the first choices for structural repair and reinforcement due to its advantages such as high strength, light weight and corrosion resistance. However, when facing some complex building structures, especially curved or irregular structures such as tunnels and bridges, the existing prestressed carbon fiber plate tensioning devices have exposed some limitations in use.

[0003] The existing prestressed carbon fiber plate tensioning device is mainly designed for flat surface structures, such as the bottom surface of beams and bridge decks. The reinforcement of these structures is relatively simple, and there is sufficient tensioning space to successfully complete the reinforcement operation. However, during the construction of curved structures such as shield tunnels, the existing tensioning devices are difficult to play an effective role due to construction conditions and space limitations. Since the existing devices are designed to mainly serve planar structures, they are often unable to make effective adjustments and apply force in a narrow space during the tensioning process, which greatly reduces the reinforcement effect.

[0004] For example, patent CN106193643A discloses a prestressed carbon fiber plate tensioning and anchoring device, which can be effectively applied to the reinforcement of steel beams and composite beams, but its design is still limited to larger planes or regular structures and cannot meet the tensioning requirements of narrow spaces or curved structures. In actual applications, the device often cannot complete the expected tensioning operation due to insufficient tensioning space, thus affecting the reinforcement effect.

[0005] For another example, patent CN117449608B discloses an automatic leveling carbon fiber plate prestressing tensioning device for curved surface structures. Although this patent solves the problem of insufficient tensioning space, it cannot make the carbon fiber plate fit the curved surface structure, so it occupies a large working space in actual use, affecting the use effect.

[0006] Therefore, the limitation of the existing technology is that when reinforcing complex curved structures or limited construction space, it cannot provide enough operating space to complete the effective tensioning and anchoring of the prestressed carbon fiber plate, and after the tensioning is completed, the device occupies a large working space. In the face of this problem, there is an urgent need for a prestressed carbon fiber plate tensioning device that can be flexibly operated in a limited space and adapt to irregular shapes to solve the problem of insufficient applicability of the existing technology in narrow spaces.

[0007] The present invention improves upon this limitation and provides a device that can effectively tension carbon fiber panels when tensioning space is insufficient, thereby improving its application effect in curved surfaces and complex structures. By optimizing the design of the tensioning device, the present invention can adapt to structural surfaces of different shapes and achieve efficient tensioning and reinforcement operations when space is limited. Summary of the invention

[0008] In view of this, the present invention provides a prestressed tensioning device for a carbon fiber plate, which realizes the tensioning of the carbon fiber plate on the curved surface structure and ensures the application effect of the carbon fiber plate in the curved surface and complex structures. In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0009] The present invention provides a carbon fiber plate prestressing tensioning device, which is used to attach the carbon fiber plate to a curved surface structure, comprising:

[0010] A fixing part, comprising a fixing base plate and a fixing fixture, wherein the fixing base plate is fixed on the arc surface structure, and the fixing fixture is rotatably connected to the fixing base plate;

[0011] The movable part comprises a movable clamp, a movable stopper, a movable base plate, a tension piece, a reaction plate and a steel cable, wherein the movable clamp is arranged opposite to the fixed clamp, the movable base plate is arranged on a side of the movable clamp away from the fixed clamp and is fixed on the curved surface structure, a fixed block and a steering block are arranged on the movable base plate, the steering block is arranged on a side of the fixed block away from the movable clamp, the movable clamp is rotatably connected to the movable stopper, the steel cable passes through the movable stopper, the fixed block, the steering block and the reaction plate in sequence, the steel cable is connected to an end of the reaction plate away from the steering block through a third steel cable anchor, the steel cable is connected to an end of the movable stopper close to the fixed clamp through a first steel cable anchor, and the tension piece is connected between the steering block and the reaction plate;

[0012] A card plate, wherein a plurality of the card plates are provided, and the plurality of card plates are sequentially arranged between the fixed fixture and the movable fixture, and the plurality of card plates are all connected to the arc surface structure.

[0013] Furthermore, a second steel cable anchor is provided between the fixed block and the steering block, and the steel cable is connected to the fixed block via the second steel cable anchor.

[0014] Furthermore, a gasket is provided at one end of the second steel cable anchor close to the steering block, and the other end of the gasket is connected to the steering block.

[0015] Furthermore, the fixing portion further comprises a fixed stopper, the fixed stopper is fixedly connected to the fixed base plate, and the fixing fixture is rotatably connected to the fixed stopper.

[0016] Furthermore, the tension member includes a jack and an axial pressure sensor, one end of the jack is connected to the steering block, one end of the jack away from the steering block is connected to the axial pressure sensor, and one end of the axial pressure sensor away from the jack is connected to the reaction plate.

[0017] Furthermore, a groove is provided at one end of the movable bottom plate away from the curved surface structure, and the steering block is fixed in the groove by bolts.

[0018] It can be seen from the above technical scheme that compared with the prior art, the present invention discloses a carbon fiber plate prestressing tensioning device, which clamps the two ends of the carbon fiber plate by a fixed clamp and a movable clamp, pulls the steel cable by a tension piece to tension the carbon fiber plate, and changes the force direction of the steel cable by a steering block, so that the tensioning device can be applied to curved structures with insufficient tensioning space, thereby ensuring the tensioning effect of the carbon fiber plate on the curved structure, and further ensuring the reinforcement effect of the prestress of the carbon fiber plate on the curved structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0020] Figure 1 A schematic diagram of the structure of the carbon fiber plate prestressing tensioning device provided by the present invention;

[0021] Figure 2 This is a schematic diagram of the structure of the carbon fiber plate prestressing tensioning device provided by the present invention after installation;

[0022] Figure 3 A schematic diagram of the structure of the mobile clamp provided by the present invention;

[0023] Figure 4 A schematic diagram of the structure of the fixing fixture provided by the present invention;

[0024] Figure 5 A schematic diagram of the structure of the fixed base plate provided by the present invention;

[0025] Figure 6 A schematic diagram of the structure of the movable bottom plate provided by the present invention;

[0026] Figure 7 A schematic diagram of the structure of the steering block provided by the present invention;

[0027] Figure 8A schematic diagram of the structure of the mobile block provided by the present invention;

[0028] Fig. 9 Another structural schematic diagram of the steering block provided by the present invention.

[0029] In the figure: 1. fixed base plate; 2. fixed clamp; 3. fixed block; 4. clamp bolt one; 5. clamp bolt two; 6. nut; 7. carbon fiber plate; 8. clamp plate; 9. steel cable; 10. first steel cable anchor; 11. movable block; 12. movable clamp; 13. movable base plate; 14. fixed block; 15. second steel cable anchor; 16. gasket; 17. steering block; 18. high-strength bolt; 19. jack; 20. axial pressure sensor; 21. third steel cable anchor; 22. reaction plate; 23. bolt; 24. arc surface structure. DETAILED DESCRIPTION

[0030] 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 described embodiments 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 creative work are within the scope of protection of the present invention.

[0031] See also Figure 1-9 The embodiment of the present invention discloses a carbon fiber plate prestressing tensioning device, which is used to attach the carbon fiber plate 7 to the curved surface structure 24, including:

[0032] The fixing part includes a fixing base plate 1 and a fixing fixture 2, wherein the fixing base plate 1 is fixed on the arc surface structure 24, and the fixing fixture 2 is rotatably connected to the fixing base plate 1;

[0033] The moving part includes a moving fixture 12, a moving stopper 11, a moving base plate 13, a tension piece, a reaction plate 22 and a steel cable 9. The moving fixture 12 is arranged opposite to the fixed fixture 2. The moving base plate 13 is arranged on a side of the moving fixture 12 away from the fixed fixture 2 and is fixed on the curved surface structure 24. A fixed block 14 and a steering block 17 are arranged on the moving base plate 13. The steering block 17 is arranged on a side of the fixed block 14 away from the moving fixture 12. The moving fixture 12 is rotatably connected to the moving stopper 11. The steel cable 9 passes through the moving stopper 11, the fixed block 14, the steering block 17 and the reaction plate 22 in sequence. The steel cable 9 is connected to the end of the reaction plate 22 away from the steering block 17 through a third steel cable anchor. The steel cable 9 is connected to the end of the moving stopper 11 close to the fixed fixture 2 through a first steel cable 9 anchor 10. The tension piece is connected between the steering block 17 and the reaction plate 22.

[0034] The card plate 8 is provided with a plurality of card plates 8 , and the plurality of card plates 8 are sequentially arranged between the fixed fixture 2 and the movable fixture 12 , and the plurality of card plates 8 are all connected to the arc surface structure 24 .

[0035] By changing the movement direction of the steel cable 9 through the steering block 17, sufficient space for tensioning the carbon fiber plate 7 is ensured, and the prestress of the carbon fiber plate 7 is ensured to meet the requirements of reinforcing the curved surface structure 24, so that the carbon fiber plate 7 tensioning device can be flexibly operated in a limited space and adapt to the complex curved surface structure 24.

[0036] The fixed base plate 1 and the movable base plate 13 are fixed on the curved surface structure 24 by bolts 23, one end of the carbon fiber plate 7 is inserted into the fixed fixture 2, one end of the carbon fiber plate 7 is fixed in the fixed fixture 2 by clamp bolts 1 4 and clamp bolts 2 5, the other end of the carbon fiber plate 7 is inserted into the movable fixture 12, the other end of the carbon fiber plate 7 is fixed in the movable fixture 12 by high-strength clamp bolts, and multiple clamps 8 are installed in sequence between the fixed fixture 2 and the movable fixture 12, the carbon fiber plate 7 is made to fit the curved structure 24 by the clamps 8, and tension is applied to the steel cable 9 by the tension piece, the steel cable 9 is bent through the curved slide of the steering block 17 and drives the carbon fiber plate 7 to be tensioned, so that the prestress of the carbon fiber plate 7 adapts to the reinforcement requirements of the curved surface structure 24, and during the tensioning process, the carbon fiber plate 7 slides close to the curved surface under the constraint of the clamps 8.

[0037] In some embodiments, a second steel cable anchor 15 is disposed between the fixed block 14 and the steering block 17 , and the steel cable 9 is connected to the fixed block 14 via the second steel cable anchor 15 .

[0038] When the carbon fiber plate 7 is tensioned, the steering block 17, the tension member, the third steel cable anchor 21 and the reaction steel plate are removed, and the steel cable 9 is continued to be clamped by the second steel cable anchor 15 to maintain the prestressed state of the carbon fiber plate 7 on the curved surface structure 24.

[0039] In some embodiments, a gasket 16 is provided at one end of the second steel cable anchor 15 close to the steering block 17 , and the other end of the gasket 16 is connected to the steering block 17 .

[0040] In some embodiments, the fixing portion further includes a fixing stopper 3 , the fixing stopper 3 is fixedly connected to the fixing base plate 1 , and the fixing fixture 2 is rotatably connected to the fixing stopper 3 .

[0041] The fixing fixture 2 is rotatably connected to the fixing block 3 via a nut 6, so that the carbon fiber plate 7 can rotate at a small angle during the tensioning process. The fixing block 3 is welded to the fixed base plate 1 to ensure that the fixing fixture 2 can rotate slightly to prevent eccentricity.

[0042] In some embodiments, a chamfer is provided at one end of the fixed fixture 2 and the movable fixture 12 which are close to each other.

[0043] The chamfered structure enables the carbon fiber plate 7 to bend within a certain range without breaking.

[0044] In some embodiments, the tension member includes a jack 19 and an axial pressure sensor 20, one end of the jack 19 is connected to the steering block 17, the end of the jack 19 away from the steering block 17 is connected to the axial pressure sensor 20, and the end of the axial pressure sensor 20 away from the jack 19 is connected to the reaction plate 22.

[0045] In some embodiments, a groove is provided at one end of the movable bottom plate 13 away from the curved surface structure 24, and the steering block 17 is fixed in the groove by bolts.

[0046] The steering block 17 is fixed in the groove by high-strength bolts 18 to ensure the stability of the moving part.

[0047] During the tensioning process of the carbon fiber plate 7, the fixed part and the movable part are respectively installed at the two ends of the curved surface structure 24, one end of the carbon fiber plate 7 is clamped in the fixed fixture 2, and the other end is clamped in the movable fixture 12, and the middle part of the carbon fiber plate 7 is made to fit on the curved surface structure 24 by using the clamping plate 8, and the tension is gradually applied by the jack 19, the steel cable 9 is bent by the curved slide of the steering block 17, and the carbon fiber plate 7 is pulled along the curved surface structure 24 for tensioning until the prestress required by the design is reached.

[0048] During this process, the axial pressure sensor 20 monitors the tensioning force in real time to ensure that the prestressing tensioning process meets the design requirements. After the tensioning is completed, the steering block 17, high-strength bolts 18, jacks 19, axial pressure sensors 20, third steel cable anchors 21 and reaction steel plates are removed. The steel cable 9 is clamped by the second steel cable anchor 15 to maintain the prestressed state of the carbon fiber plate 7. The carbon fiber plate 7 can maintain the prestress for a long time, enhancing the strength and stability of the curved surface structure 24.

[0049] Safety performance analysis

[0050] Safety performance verification of bolt group of tensioning device:

[0051] In the carbon fiber plate tensioning device, the core force-bearing component is the bolt, and the bolt with a grade of 10.9 and a diameter of M16 is specifically selected, and is designed to withstand a prestress of 250kN. In view of the fact that the bolt needs to resist the combined effects of tension, bending moment and shear force at the same time in actual operation, in order to ensure that the bolt is not damaged during the entire tensioning operation and when the carbon fiber plate reaches the limit state, this embodiment conducts a detailed safety performance analysis of the bolt group in the device based on the steel structure design principle. The specific process is as follows:

[0052] The specific calculation formula for friction type connection high strength bolts is as follows:

[0053]

[0054] Where:

[0055] N t1 --The maximum tensile force of a high-strength bolt, N;

[0056] N--The tensile force on the bolt, N;

[0057] n--the total number of connected bolts;

[0058] M--Bending moment borne by the bolt, N·mm;

[0059] y 1 --The maximum distance from the bolt to the centroidal axis, mm;

[0060] y i --Distance from bolt to centroidal axis, mm.

[0061] N t1 ≤0.8P (2)

[0062] Where:

[0063] P--The pre-tension design value of a high-strength bolt, N.

[0064]

[0065] Where:

[0066] A e --Effective cross-sectional area at the bolt thread, mm 2 .

[0067] f u --The minimum tensile strength of the bolt material after heat treatment, for grade 10.9, take 1040N / mm 2 . Calculation of design value of shear bearing capacity of high-strength bolt group:

[0068]

[0069] Where:

[0070] μ--anti-slip coefficient of friction surface;

[0071] ∑N ti --The total external tensile force on the bolt, N.

[0072]

[0073] Where:

[0074] V--Shear force borne by the bolt, N.

[0075] The specific calculation formula for pressure-bearing connection high-strength bolts is as follows:

[0076]

[0077] Where:

[0078] N v -- Shear force on the bolt, N;

[0079] N v b --The design value of the shear bearing capacity of a high-strength bolt, N;

[0080] N t --Tension force on the bolt, N;

[0081] N t b --Design value of tensile bearing capacity of a high-strength bolt, N.

[0082]

[0083] Where:

[0084] n v --Number of sheared surfaces: 1 for single shearing and 2 for double shearing;

[0085] f v b --Design value of bolt shear strength, 10.9 grade 310N / mm 2 .

[0086]

[0087] Where:

[0088] f t b --Design value of bolt tensile strength; 10.9 grade 500N / mm 2 ;

[0089] Calculation of hole wall pressure:

[0090]

[0091] Where:

[0092] N c b --Design value of compressive bearing capacity of a high-strength bolt connection, N.

[0093]

[0094] Where:

[0095] d--diameter of a high-strength bolt rod, mm;

[0096] ∑t--the smaller value of the total thickness of the pressure-bearing member in one direction of force among different directions of force;

[0097] f c b --Design value of compressive strength of components connected by high-strength bolts, N / mm 2 .

[0098] Table 1 shows the verification results of the friction-type connection high-strength bolts, which are calculated by formulas (1) to (5). It can be seen that the design value of the shear bearing capacity of the bolt group is 342.50 kN, which is significantly greater than the shear force (292.32 kN) borne by the bolt group when the carbon fiber plate is tensioned to the target load. In addition, when the carbon fiber plate reaches the target load, the tension borne by the bolt is 67.45 kN, which is lower than 0.8 times the tension value it can withstand (124 kN). Therefore, the high-strength bolt group of the friction-type connection will not be damaged during the entire tensioning process.

[0099] Table 2 shows the verification results of high-strength bolts for pressure-bearing connections, which are calculated using formulas (6) to (10). The results show that when the carbon fiber plate is tensioned to the target load, 1.2 times the shear force borne by a single bolt (40.25×1.2=48.30kN) is less than its tolerable shear force limit (75.20kN). In summary, even if the carbon fiber plate is damaged, the tensioning device can still remain intact and will not be damaged.

[0100] Table 1 Calculation results of friction type connection high strength bolts

[0101]

[0102] Table 2 Verification and judgment of friction type connection high strength bolts

[0103]

[0104] Table 3 Verification results of high-strength bolts for pressure-bearing connections

[0105]

[0106] Table 4 Verification and judgment of high-strength bolts for pressure-bearing connections

[0107]

[0108] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0109] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A carbon fiber plate prestressing tensioning device, used to attach the carbon fiber plate to a curved surface structure, characterized in that: include: A fixing part, comprising a fixing base plate and a fixing fixture, wherein the fixing base plate is fixed on the arc surface structure, and the fixing fixture is rotatably connected to the fixing base plate; The movable part comprises a movable clamp, a movable stopper, a movable base plate, a tension piece, a reaction plate and a steel cable, wherein the movable clamp is arranged opposite to the fixed clamp, the movable base plate is arranged on a side of the movable clamp away from the fixed clamp and is fixed on the curved surface structure, a fixed block and a steering block are arranged on the movable base plate, the steering block is arranged on a side of the fixed block away from the movable clamp, the movable clamp is rotatably connected to the movable stopper, the steel cable passes through the movable stopper, the fixed block, the steering block and the reaction plate in sequence, the steel cable is connected to an end of the reaction plate away from the steering block through a third steel cable anchor, the steel cable is connected to an end of the movable stopper close to the fixed clamp through a first steel cable anchor, and the tension piece is connected between the steering block and the reaction plate; A card plate, wherein a plurality of the card plates are provided, and the plurality of card plates are sequentially arranged between the fixed fixture and the movable fixture, and the plurality of card plates are all connected to the arc surface structure.

2. The carbon fiber plate prestressing tensioning device according to claim 1, characterized in that: A second steel cable anchor is arranged between the fixed block and the steering block, and the steel cable is connected to the fixed block via the second steel cable anchor.

3. The carbon fiber plate prestressing tensioning device according to claim 2, characterized in that: A gasket is provided at one end of the second steel cable anchor close to the steering block, and the other end of the gasket is connected to the steering block.

4. The carbon fiber plate prestressing tensioning device according to claim 1, characterized in that: The fixing portion further comprises a fixing stopper, the fixing stopper is fixedly connected to the fixing base plate, and the fixing fixture is rotatably connected to the fixing stopper.

5. The carbon fiber plate prestressing tensioning device according to claim 1, characterized in that: The tension member includes a jack and an axial pressure sensor, one end of the jack is connected to the steering block, one end of the jack away from the steering block is connected to the axial pressure sensor, and one end of the axial pressure sensor away from the jack is connected to the reaction plate.

6. The carbon fiber plate prestressing tensioning device according to claim 1, characterized in that: A groove is arranged at one end of the movable bottom plate away from the curved surface structure, and the steering block is fixed in the groove by bolts.

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