A device for detecting the strength of a carbon fiber reinforced concrete member

Abstract

The application discloses a kind of concrete member stick carbon fiber reinforcing strength detection device, including mobile platform and the power unit being set on mobile platform;Mobile platform is provided with the pulling unit being connected with power unit, pulling unit is connected with tension sensor, tension sensor is connected with the sliding unit moving horizontally on mobile platform;Width adjusting mechanism is set on sliding unit, and a plurality of clamping block structures are arranged on the opposite sides of width adjusting mechanism, and width adjusting mechanism is connected with the pre-tightening force unit being set on sliding unit;In the application, the clamping block structure on both sides can be driven to approach each other by pre-tightening force unit and hold carbon fiber cloth, and the fiber cloth is directly clamped by clamping block structure, with high versatility;Furthermore, the distance between multiple clamping block structures can be adjusted by width adjustment, for adjusting the clamping range of clamping block structure, to adapt to the detection needs of carbon fiber cloth of different widths.

Description

Technical Field

[0001] This invention belongs to the field of carbon fiber bonding quality testing technology for structural members, and relates to a device for testing the strength of concrete structural members reinforced with carbon fiber. Background Technology

[0002] Carbon fiber reinforcement technology is widely used in the strengthening and reinforcement of building structures due to its advantages such as high strength, lightweight, corrosion resistance, and convenient construction. This technology involves bonding carbon fiber cloth or sheets to the surface of concrete components, utilizing the high tensile strength of carbon fiber to improve the load-bearing capacity and durability of the structure. However, the effectiveness of carbon fiber reinforcement is highly dependent on the bond strength between the carbon fiber material and the reinforced concrete component. If the bond strength is insufficient, delamination failure can easily occur under load, leading to reinforcement failure. Therefore, rapid and accurate on-site testing of the bond strength between carbon fiber and concrete is of great significance for controlling the quality of reinforcement projects and ensuring structural safety.

[0003] In the prior art, Chinese Patent CN204575514U discloses a device for testing the bonding strength of fiber cloth during construction. This device includes a symmetrical outrigger support, tension / compression sensors, and a hydraulic jack. The fiber cloth is wrapped in a ring around both ends of the device and then adhered to the reinforced concrete component. Tension is then applied using the hydraulic jack for testing. While this device has a simple structure and can be used for on-site testing, the force applied to the fiber cloth is by the cylindrical mechanism of the symmetrical outrigger support, which is only suitable for supporting the corners of the fiber cloth and not for directly clamping it, resulting in poor versatility. Furthermore, it is not suitable for testing carbon fiber cloths of different widths.

[0004] Therefore, in order to solve the above-mentioned technical problems, there is an urgent need for a versatile testing device that can be applied to concrete components with different widths to test the strength of carbon fiber reinforcement. Summary of the Invention

[0005] This invention proposes a device for testing the strength of concrete components reinforced with carbon fiber, which effectively solves the problems in the prior art.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a device for testing the strength of concrete components reinforced with carbon fiber, comprising a mobile platform and a power unit disposed on the mobile platform; a traction unit connected to the power unit is disposed on the mobile platform, the traction unit is connected to a tension sensor, and the tension sensor is connected to a sliding unit that moves horizontally on the mobile platform;

[0007] The sliding unit is provided with a width adjustment mechanism. Multiple clamping block structures are provided on both sides of the width adjustment mechanism. The width adjustment mechanism can drive the clamping block structures on each side to move closer or further away from each other, so as to adjust the clamping range of the multiple clamping block structures.

[0008] The width adjustment mechanism is connected to a pre-tightening unit set on the sliding unit, which can drive the clamping block structures on both sides to move closer or further apart, for clamping or releasing carbon fibers.

[0009] Furthermore, the sliding unit includes a base and a support plate connected to the end of the base; the base is connected to the moving platform through a sliding groove slider structure, and the width adjustment mechanism and the preload unit are disposed on the support plate; the tension sensor is connected to the base.

[0010] Furthermore, the width adjustment mechanism includes a first slide rail disposed on the pallet, a first slider cooperating with the first slide rail, a servo cylinder connected to the first slider, and a fixing block fixed to the end of the pallet;

[0011] A first light rod is fixed on both the first slider and the fixed block. A first moving block is symmetrically slidably arranged at both ends of the first light rod. A telescopic structure is connected between the first moving blocks on the two first light rods. The clamping block structure is arranged on the telescopic structure. The pre-tightening force unit is connected between the telescopic structures at both ends, which can drive the telescopic structures to move closer or further apart.

[0012] Furthermore, the telescopic structure includes a second optical rod fixed to the first movable block. Multiple second movable blocks are symmetrically slidably arranged at both ends of the second optical rod. A telescopic cross link is arranged between two second optical rods. The hinge point in the middle of the telescopic cross link is respectively hinged to the first movable block, and the hinge points at both ends are respectively hinged to the second movable block. A clamping block structure is installed on each of the second movable blocks located on one side of the fixed block.

[0013] Furthermore, the preload unit includes a connecting plate connected to the first moving block, a lead screw nut mounted on the connecting plate, and a rotating lead screw that cooperates with the lead screw nut. The rotating lead screw has a power source connected to the middle of the support plate. The threads at both ends of the rotating lead screw have opposite directions.

[0014] Furthermore, the power source includes a worm gear fixed to the middle of the rotating lead screw, a worm meshing with the worm gear and mounted on a support plate, and a servo motor connected to the worm.

[0015] Furthermore, the clamping block structure includes a base block fixed to the second moving block and a clamping body slidably connected to the base block, wherein the sides of the base block and the clamping body that cooperate with each other are wedge surfaces.

[0016] Furthermore, several protrusions are provided on the opposite sides of the clamps located at both ends of the first optical rod, and the protrusions on the opposite clamps are arranged in an alternating pattern.

[0017] Furthermore, the mobile platform includes a base, rollers mounted on the bottom of the base, and a bracket mounted on the base; the sliding unit and the power unit are both mounted on the bracket.

[0018] Furthermore, the top of the bracket is provided with a first hydraulic cylinder that can extend horizontally, and the bottom is provided with a second hydraulic cylinder that can extend vertically.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] In this invention, the pre-tightening unit can drive the clamping block structures on both sides to move closer together to clamp the carbon fiber cloth. Through the coordinated action of the power unit and the traction unit, the carbon fiber cloth is pulled. The maximum tensile force borne by the bonded part of the carbon fiber cloth is recorded by the tension sensor, thus completing the detection of the bond reinforcement strength. Therefore, the fiber cloth is directly clamped by the clamping block structure, which has high versatility.

[0021] In this invention, the distance between multiple clamping block structures can be adjusted by the width adjustment groove, which is used to adjust the clamping range of the clamping block structure and can adapt to the detection requirements of carbon fiber cloth of different widths.

[0022] In this invention, the entire device can be moved to different detection positions via a mobile platform, providing greater flexibility. Attached Figure Description

[0023] Figure 1 This is the front view of the present invention;

[0024] Figure 2 This is a front view of the sliding unit and the width adjustment mechanism in this invention;

[0025] Figure 3 This is a top view of the sliding unit and the width adjustment mechanism in this invention;

[0026] Figure 4 This is a perspective view of the clamping block structure in this invention.

[0027] In the diagram: 1. Moving platform; 101. Base; 102. Roller; 103. Bracket; 2. Power unit; 3. Pulling unit; 4. Tension sensor; 5. Sliding unit; 501. Base; 502. Support plate; 6. Width adjustment mechanism; 610. First slide rail; 620. First slider; 630. Servo cylinder; 640. Fixed block; 650. First guide rod; 660. Telescopic structure; 670. First moving block; 661. Second guide rod; 662. Second moving block; 663. Telescopic cross link; 7. Clamping block structure; 701. Base block; 702. Clamping body; 703. Protruding strip; 8. Pre-tightening unit; 801. Connecting plate; 802. Rotating screw; 803. Power source; 9. First hydraulic cylinder; 10. Second hydraulic cylinder. Detailed Implementation

[0028] 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 some embodiments of the present invention, and not all embodiments. 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.

[0029] like Figures 1 to 4 As shown, this invention proposes a device for testing the strength of concrete components reinforced with carbon fiber, including a moving platform 1 and a power unit 2 mounted on the moving platform 1. A traction unit 3 connected to the power unit 2 is mounted on the moving platform 1, and a tension sensor 4 is connected to the traction unit 3. The tension sensor 4 is connected to a sliding unit 5 that moves horizontally on the moving platform 1. A width adjustment mechanism 6 is mounted on the sliding unit 5, and multiple clamping block structures 7 are mounted on opposite sides of the width adjustment mechanism 6. The width adjustment mechanism 6 can move the clamping block structures 7 closer to or further away from each other to adjust the clamping range of the multiple clamping block structures 7. A pre-tightening force unit 8 is connected to the width adjustment mechanism 6 and mounted on the sliding unit 5, which can also move the clamping block structures 7 closer to or further away from each other to clamp or release the carbon fiber.

[0030] Among them, the traction unit 3 adopts a hydraulic cylinder, and the power unit 2 adopts a hydraulic pump station. The hydraulic pump station can control the extension and retraction of the hydraulic cylinder, which can then drive the sliding unit 5 to move horizontally on the moving platform 1.

[0031] The mobile platform 1 includes a base 101, rollers 102 mounted on the bottom of the base 101, and a bracket 103 mounted on the base 101. The sliding unit 5 and the power unit 2 are both mounted on the bracket 103. The base 101 can be made of steel welded into a square shape, and the rollers are made of casters with locking structures, which are mounted on the base 101 by high-strength bolts. The bracket 103 is a frame made of steel pipes or steel welded together, which has high strength and can support the components on it and withstand the strength of the testing pull. The hydraulic pump station is directly mounted on the base 101 by bolts and is adjacent to the bracket 103.

[0032] In this embodiment, the sliding unit 5 includes a base 501 and a support plate 502 connected to the end of the base 501. The base 501 is connected to the moving platform 1 through a sliding groove slider structure. The width adjustment mechanism 6 and the pre-tightening force unit 8 are disposed on the support plate 502. One end of the tension sensor 4 is connected to the base 501 by bolts, and the other end is welded to the telescopic end of the power unit 2. The base 501 is drawer-shaped, and the sliding groove can be opened on the opposite side plate of the base 501. The slider is welded to the bracket 103. The sliding unit 5 can move horizontally on the horizontal plane under the drive of the power unit 2.

[0033] In this embodiment, the width adjustment mechanism 6 includes a first slide rail 610 disposed on the support plate 502, a first slider 620 cooperating with the first slide rail 610, a servo cylinder 630 connected to the first slider 620, and a fixing block 640 fixed to the end of the support plate 502; a first guide rod 650 is fixed on both the first slider 620 and the fixing block 640, and a first moving block 670 is symmetrically slidably disposed at both ends of the first guide rod 650. A telescopic structure 660 is connected between the first moving blocks 670 on the two first guide rods 650, a clamping block structure 7 is disposed on the telescopic structure 660, and a pre-tightening unit 8 is connected between the two telescopic structures 660, which can drive the telescopic structures 660 to move closer to each other. The servo cylinder 630 is an electric servo cylinder connected to an external power source. When the servo cylinder 630 is activated, it can push the first slider 620 to move along the first slide rail 610 toward the fixed block 640. The first guide rod 650 moves with the first slide rail 610 and can drive the telescopic structure 660 to extend, thereby increasing the distance between the clamping block structures 7, which can clamp wider carbon fiber cloth. Conversely, when the electric servo cylinder 630 is activated to reverse, it drives the first slider 620 away from the fixed block 640, which allows the telescopic structure 660 to drive the clamping block structures 7 to move closer to each other, which can clamp narrower carbon fiber cloth, making it suitable for carbon fiber cloth of different widths.

[0034] The first slide rail 610 is I-shaped and is fastened to the support plate 502 by bolts. The first slider 620 has a groove that matches the first slide rail 610, allowing the first slider 620 to slide smoothly along the first slide rail 610. The servo cylinder 630 is fixed to the base 501 of the sliding unit 5 by bolts. The telescopic end of the servo cylinder 630 is connected to the first slider 620 by a threaded structure. The first slider 620 and the fixed block 640 have through holes, and the first guide rod 650 is interference-fitted into the through holes to limit the position of the first guide rod 650. A linear bearing is installed in the first moving block 670 and is sleeved on the first guide rod 650 to ensure the smooth movement of the first moving block 670.

[0035] In this embodiment, the telescopic structure 660 includes a second optical rod 661 fixed to the first moving block 670. Multiple second moving blocks 662 are symmetrically slidably arranged at both ends of the second optical rod 661. A telescopic cross link 663 is provided between two second optical rods 661. The hinge point in the middle of the telescopic cross link 663 is hinged to the first moving block 670, and the hinge points at both ends are hinged to the second moving blocks 662. Clamping block structures 7 are installed on each of the second moving blocks 662 located on one side of the fixed block 640. When the first slider 620 moves closer to the fixed block 640, the telescopic cross link 663 extends to both ends, thereby causing the second moving blocks 662 on the second optical rod 661 to move away from each other, increasing the distance between the clamping block structures 7. When the first slider 620 moves away from the fixed block 640, the telescopic cross link 663 retracts towards the center, thereby causing the second moving blocks 662 on the second optical rod 661 to move closer to each other, decreasing the distance between the clamping block structures 7.

[0036] The telescopic cross link 663 is composed of multiple links connected by cross hinges, enabling it to extend and retract, while simultaneously driving the second moving block 662 to slide on the second smooth rod 661. The first moving block 670 has a through hole, into which the second smooth rod 661 is interference-fitted. The second moving block 662 also has a through hole, allowing the second smooth rod 661 to pass through. The number of second moving blocks 662 on the second smooth rods 661 on both sides can be freely designed according to the number of clamping block structures 7.

[0037] In this embodiment, the preload unit 8 includes a connecting plate 801 connected to the first moving block 670, a lead screw nut mounted on the connecting plate 801, and a rotating lead screw 802 that cooperates with the lead screw nut. A power source 803 mounted on the support plate 502 is connected to the middle of the rotating lead screw 802. The threads at both ends of the rotating lead screw 802 have opposite directions. The power source 803 can drive the rotating lead screw 802 to rotate in both directions. Since the threads at both ends of the rotating lead screw 802 have opposite directions, the lead screw nut that cooperates with the rotating lead screw 802 will move closer or further away from each other. This can drive the first moving blocks 670 at both ends of the first guide rod 650 to move closer or further away from each other. In turn, it can drive the clamping block structures 7 on the second moving blocks 662 on both sides of the first guide rod 650 to move closer or further away from each other, thereby realizing the clamping and release of the carbon fiber cloth.

[0038] In this embodiment, the power source 803 includes a worm gear fixed to the middle of the rotating lead screw 802, a worm meshing with the worm gear and mounted on the support plate 502, and a servo motor connected to the worm. The servo motor is connected to an external power source. When the servo motor is turned on, it drives the rotating lead screw 802 to rotate through the power transmission of the worm gear and worm. The worm gear and worm have a self-locking property, which can prevent the rotating lead screw 802 from rotating freely and improve the stability of the clamping structure.

[0039] The worm gear has bearing seats and bearing structures at both ends, and the bearing seats are fixed to the support plate 502 by bolts; the output shaft of the servo motor is connected to the end of the worm gear through a coupling; the worm wheel is directly welded to the middle of the rotating lead screw 802.

[0040] In this embodiment, the clamping block structure 7 includes a base block 701 fixed to the second moving block 662 and a clamping body 702 slidably connected to the base block 701. The sides of the base block 701 and the clamping body 702 that cooperate with each other are wedge surfaces. Under the action of the pre-tightening unit 8, the clamping block structures 7 on both sides can be brought closer to each other, and finally the clamping bodies 702 in the clamping block structures 7 on both sides can clamp the carbon fiber cloth. Moreover, under the action of the pulling unit 3, a tension force is applied to the carbon fiber cloth. Due to the existence of the wedge surface, the clamping bodies 702 on both sides slide along the wedge surface under the action of the tension force, thereby making the two clamping bodies 702 clamp tighter and tighter as they are pulled, maintaining the reliability of clamping the carbon fiber cloth during the detection process. A "T"-shaped sliding groove is opened on the base block 701, and a sliding strip that cooperates with the sliding groove is integrally connected to the clamping body 702. The opening direction of the sliding groove and the sliding strip is parallel to the wedge surface. With the cooperation of the sliding groove and the sliding strip, the clamping body 702 can slide along the base block 701.

[0041] In this embodiment, several protrusions 703 are provided on the opposite sides of the clamping bodies 702 located at both ends of the first optical rod 650. The protrusions 703 on the clamping bodies 702 are arranged in an alternating pattern. When the clamping bodies 702 clamp the carbon fiber cloth, the protrusions 703 can increase the friction on the carbon fiber cloth. Furthermore, the protrusions 703 are arranged in an alternating pattern, forming a wave shape at the part where the carbon fiber cloth is clamped, which prevents the carbon fiber cloth from slipping out between the clamping bodies 702 and further increases the reliability of clamping.

[0042] In this embodiment, the top of the support 103 is provided with a first hydraulic cylinder 9 that can extend horizontally, and the bottom is provided with a second hydraulic cylinder 10 that can extend vertically. Both the first hydraulic cylinder 9 and the second hydraulic cylinder 10 are connected to the power unit 2 through pipelines. The power unit 2 can provide hydraulic power to the first hydraulic cylinder 9 and the second hydraulic cylinder 10 and control their extension and retraction. When the entire invention is moved to the position to be tested by the mobile platform 1, the power unit 2 controls the first hydraulic cylinder 9 to extend and press against the concrete component, and controls the second hydraulic cylinder 10 to press against the ground to support the entire structure. This prevents the mobile platform 1 from overturning when a tensile force is applied for testing, ensuring safety during use.

[0043] In this embodiment, the tension sensor 4 is connected to an integrated working condition unit mounted on the bracket 103, which can display the data of the tension sensor 4 in real time for inspection personnel to view.

[0044] When using the above technical solution: a carbon fiber cloth with one end bonded to the concrete component and the other end unbonded is reserved at the location to be tested; the testing personnel push the mobile platform 1 to the location to be tested and lock the casters;

[0045] Next, the power unit 2 controls the extension of the first hydraulic cylinder 9 and the second hydraulic cylinder 10, so that the extension end of the first hydraulic cylinder 9 presses against the concrete component and the extension end of the second hydraulic cylinder 10 presses against the ground to support the mobile platform 1.

[0046] Next, the power unit 2 controls the extension of the pulling unit 3, which drives the base 501 to move horizontally along the bracket 103, so that the width adjustment mechanism 6, the pre-tightening force unit 8 and the clamping block structure 7 on the tray 502 move closer to the carbon fiber cloth to be tested; when the clamping structure is located at the unbonded end of the carbon fiber cloth, the width adjustment mechanism 6 is used to adjust the clamping range of multiple clamping structures according to the width of the carbon fiber cloth to suit the current width of the carbon fiber cloth.

[0047] Finally, the power source 803 drives the rotating screw 802 to rotate, and the clamping structures on both sides clamp the carbon fiber cloth under the power transmission of the screw nut. After the clamping structure has fully clamped the carbon fiber cloth, the power unit 2 controls the pulling unit 3 to shorten, applying tension to the carbon fiber cloth and detecting the bonding and reinforcement strength of the carbon fiber cloth. When the carbon fiber cloth breaks or is torn off, the maximum value of the tension sensor 4 is recorded. After the test is completed, the pre-tightening unit 8 controls the clamping block structure 7 to move away from each other to release the carbon fiber cloth.

[0048] 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 device for testing the strength of concrete components reinforced with carbon fiber, characterized in that: It includes a mobile platform (1) and a power unit (2) disposed on the mobile platform (1); the mobile platform (1) is provided with a traction unit (3) connected to the power unit (2), the traction unit (3) is connected to a tension sensor (4), and the tension sensor (4) is connected to a sliding unit (5) that moves horizontally on the mobile platform (1). The sliding unit (5) is provided with a width adjustment mechanism (6). Multiple clamping block structures (7) are provided on both sides of the width adjustment mechanism (6). The width adjustment mechanism (6) can drive the clamping block structures (7) on each side to move closer or further away from each other, so as to adjust the clamping range of the multiple clamping block structures (7). The width adjustment mechanism (6) is connected to a pre-tightening force unit (8) set on the sliding unit (5), which can drive the clamping block structures (7) on both sides to move closer or further apart, for clamping or releasing carbon fibers.

2. The device for testing the strength of concrete components reinforced with carbon fiber according to claim 1, characterized in that: The sliding unit (5) includes a base (501) and a support plate (502) connected to the end of the base (501); the base (501) is connected to the moving platform (1) through a sliding block structure; the width adjustment mechanism (6) and the pre-tightening unit (8) are set on the support plate (502); the tension sensor (4) is connected to the base (501).

3. The device for testing the strength of concrete components reinforced with carbon fiber according to claim 2, characterized in that: The width adjustment mechanism (6) includes a first slide rail (610) disposed on the tray (502), a first slider (620) cooperating with the first slide rail (610), a servo cylinder (630) connected to the first slider (620), and a fixing block (640) fixed to the end of the tray (502). A first light rod (650) is fixed on both the first slider (620) and the fixed block (640). A first moving block (670) is symmetrically slidably arranged at both ends of the first light rod (650). A telescopic structure (660) is connected between the first moving blocks (670) on the two first light rods (650). The clamping block structure (7) is arranged on the telescopic structure (660). The pre-tightening unit (8) is connected between the telescopic structures (660) at both ends and can drive the telescopic structures (660) to move closer or further away from each other.

4. The device for testing the strength of concrete components reinforced with carbon fiber according to claim 3, characterized in that: The telescopic structure (660) includes a second light rod (661) fixed on the first moving block (670). Multiple second moving blocks (662) are symmetrically slidably arranged at both ends of the second light rod (661). A telescopic cross link (663) is arranged between two second light rods (661). The hinge point in the middle of the telescopic cross link (663) is respectively hinged to the first moving block (670), and the hinge points at both ends are respectively hinged to the second moving blocks (662). A clamping block structure (7) is installed on each of the second moving blocks (662) located on one side of the fixed block (640).

5. The device for testing the strength of concrete components reinforced with carbon fiber according to claim 3, characterized in that: The preload unit (8) includes a connecting plate (801) connected to the first moving block (670), a lead screw nut installed on the connecting plate (801), and a rotating lead screw (802) that cooperates with the lead screw nut. The rotating lead screw (802) has a power source (803) connected to the middle of the support plate (502). The threads at both ends of the rotating lead screw (802) are in opposite directions.

6. The device for testing the strength of concrete components reinforced with carbon fiber according to claim 5, characterized in that: The power source (803) includes a worm gear fixed in the middle of the rotating lead screw (802), a worm gear meshing with the worm gear and mounted on the support plate (502), and a servo motor connected to the worm gear.

7. The device for testing the strength of concrete components reinforced with carbon fiber according to claim 4, characterized in that: The clamping structure (7) includes a base block (701) fixed on the second moving block (662) and a clamping body (702) slidably connected to the base block (701). The sides of the base block (701) and the clamping body (702) that cooperate with each other are wedge surfaces.

8. The device for testing the strength of concrete components reinforced with carbon fiber according to claim 6, characterized in that: Several protrusions (703) are provided on the opposite sides of the clamps (702) located at both ends of the first optical rod (650), and the protrusions (703) on the clamps (702) are arranged in an alternating manner.

9. The device for testing the strength of concrete components reinforced with carbon fiber according to claim 1, characterized in that: The mobile platform (1) includes a base (101), a roller (102) mounted on the bottom of the base (101), and a bracket (103) mounted on the base (101); the sliding unit (5) and the power unit (2) are both mounted on the bracket (103).

10. The device for testing the strength of concrete components reinforced with carbon fiber according to claim 9, characterized in that: The bracket (103) is provided with a first hydraulic cylinder (9) that can extend horizontally at the top and a second hydraulic cylinder (10) that can extend vertically at the bottom.

Images