Novel clamping device for testing strength of FRP bending rib and testing method thereof

Abstract

The invention discloses a novel clamping device for testing the strength of an FRP bending rib and a testing method of the novel clamping device, and relates to the technical field of clamping devices.The novel clamping device comprises a bottom plate, a limiting plate is arranged at the top of the bottom plate, a positioning piece is movably connected to the top of the limiting plate in an inserted mode, a clamping plate is arranged at the top of the bottom plate, a movable groove is formed in the bottom plate, and a clamping groove is formed in the bottom plate; a motor is fixedly arranged in the movable groove, a movable plate is fixedly arranged on the outer wall of a rotating shaft of the motor, and the end, away from the motor, of the movable plate extends out of the movable groove and is fixedly connected with the bottom face of the clamping plate. The motor is started to drive the abutting rod to move to be separated from the positioning piece, then the positioning piece moves downwards to fix the bent rib in the limiting plate, the motor drives the movable plate and the clamping plate to move, and at the moment, the clamping plate is contracted through the guide plate to clamp and fix the bent rib; therefore, the possibility that the bending rib falls off when being bent is reduced, and the bending rib is more convenient to test.

Description

Technical Field

[0001] The invention relates to the technical field of clamping devices, and in particular to a novel clamping device for testing the strength of FRP bending bars and a testing method thereof. Background Art

[0002] Steel bar corrosion leads to degradation of service performance, reduced durability and increased maintenance costs of reinforced concrete structures. FRP bars have the advantages of corrosion resistance, high tensile strength and light weight, and can be used as a new type of building material to replace steel bars. In traditional reinforced concrete structures, the main functions of stirrups are to provide shear resistance, control crack development, prevent buckling of longitudinal bars, form steel cages, and constrain core concrete. Compared with longitudinal bars, stirrups are located in the outer layer of the concrete structure and are more susceptible to external environment, leading to corrosion. Due to the anisotropic mechanical properties of FRP stirrups, the transverse strength is significantly lower than the longitudinal strength, and there are problems of internal fiber wrinkles and external fiber stress concentration at the bends, resulting in low bending and tensile strength. Therefore, determining the bending and tensile strength mechanical indicators of FRP bending bars through testing is of great value to promote its application in practical engineering.

[0003] The existing patent (Announcement No.: CN118913868A) discloses a new type of clamping device for testing the strength of FRP bending bars and a testing method thereof, which belongs to the field of civil engineering, and includes a clamping device, a grouting steel sleeve and an L-shaped FRP bending bar. The grouting steel sleeve is sleeved at both ends of the L-shaped FRP bending bar, and the clamping device is clamped at the shorter end of the L-shaped FRP bending bar. In the process of implementing this solution, it is found that the following problems exist in the prior art and have not been well solved: when the device is used, the bending bar needs to be fixed in the clamping device, and then the bending bar can be bent and its strength can be tested, so the strength test of the bending bar is more troublesome. Summary of the invention

[0004] In order to improve the problem that the bending ribs need to be fixed in a clamping device when the device is used, and then the bending ribs can be bent and their strength can be tested, thus the strength test of the bending ribs is rather troublesome, the present invention provides a novel clamping device for testing the strength of FRP bending ribs and a testing method thereof.

[0005] The present invention provides a novel clamping device for testing the strength of FRP bending bars and a testing method thereof, which adopts the following technical solutions: A novel clamping device for testing the strength of FRP bending ribs comprises a base plate, a limit plate is arranged on the top of the base plate, a positioning piece is movably inserted on the top of the limit plate, a clamping plate is arranged on the top of the base plate, a movable groove is opened in the base plate, a motor is fixedly arranged in the movable groove, a movable plate is fixedly arranged on the outer wall of the motor rotating shaft, one end of the movable plate away from the motor extends out of the movable groove and is fixedly connected to the bottom surface of the clamping plate, a resistance rod is fixedly arranged on the outer wall of the motor rotating shaft, the resistance rod is abutted against the lower end of the positioning piece, a guide plate is fixedly arranged on the top of the base plate, and the top surface of the clamping plate is slidably matched with the inner wall of the guide plate.

[0006] Through the above technical scheme, the bending rib is first inserted into the limit plate through the clamping plate, and then the motor is started to drive the resistance rod to move and separate from the positioning piece. Then the positioning piece moves down and fixes the bending rib in the limit plate, and the movable plate and the clamping plate are driven to move by the motor. At this time, the clamping plate is contracted by the guide plate to clamp and fix the bending rib.

[0007] Optionally, in the above-mentioned novel clamping device for testing the strength of FRP bending ribs, a through hole for assembling the bending ribs is provided in the limiting plate.

[0008] Optionally, in the above-mentioned novel clamping device for testing the strength of FRP bending ribs, an assembly groove for assembling the positioning piece is provided in the limiting plate.

[0009] Optionally, in the above-mentioned novel clamping device for testing the strength of FRP bending ribs, the positioning piece is U-shaped, one end of the positioning piece is inserted into the through hole and fixedly provided with a rubber plate, the other end of the positioning piece is inserted into the assembly groove and fixedly provided with a disc, and the disc is connected to the inner bottom wall of the assembly groove by setting a first spring.

[0010] Optionally, in the above-mentioned novel clamping device for testing the strength of FRP bending ribs, the clamping plate includes an upper clamping plate and a lower clamping plate, the top surface of the lower clamping plate is provided with a plurality of limit grooves, and limit rods are movably arranged in the plurality of limit grooves, the upper end of the limit rod is fixedly connected to the bottom surface of the upper clamping plate, and the lower end of the limit rod is connected to the inner bottom wall of the limit groove by setting a second spring.

[0011] Optionally, in the above-mentioned novel clamping device for testing the strength of FRP bending reinforcement, the cross-section of the movable groove is L-shaped.

[0012] Optionally, in the above-mentioned novel clamping device for testing the strength of FRP bending ribs, the movable plate includes a horizontal plate and a fixed plate, one end of the horizontal plate is fixedly connected to the rotating shaft of the motor, the other end of the horizontal plate is fixedly connected to the fixed plate, and the top of the fixed plate extends out of the movable groove and is fixedly connected to the bottom surface of the lower clamping plate.

[0013] Optionally, in the above-mentioned novel clamping device for testing the strength of FRP bending ribs, the shape of the resistance rod is L-shaped, the upper end of the resistance rod is chamfered, and the end of the positioning member that abuts against the resistance rod is chamfered.

[0014] Optionally, in the above-mentioned novel clamping device for testing the strength of FRP bending ribs, an L-shaped groove is provided at the bottom of the guide plate.

[0015] Another technical solution proposed by the present invention is a novel clamping device for testing the strength of FRP bending bars and a testing method thereof, comprising the following steps: S101: First, the motor is started to drive the abutment rod to rotate and abut against the positioning member, thereby causing the positioning member to move upward, and as the motor runs, the clamping plate is reset and separated from the guide plate, and then the clamping plate is unfolded; S102: inserting the bending rib into the limiting plate through the clamping plate, then starting the motor to drive the abutment rod to rotate, and when the abutment rod moves, it separates from the positioning member, and then the positioning member and the rubber plate are pulled downward by the first spring, thereby fixing one end of the bending rib in the limiting plate; S103: The movable plate and the clamping plate are driven by a motor to move and contact with the inner wall of the guide plate, thereby causing the clamping plate to contract to clamp and fix the bending rib, and the bending rib is bent as the movable plate drives the clamping plate to move; S104: As the bending ribs are continuously bent, the bending ribs are tested by a testing device to calculate the strength of the bending ribs.

[0016] In summary, the present invention includes at least one of the following beneficial effects: The motor is started to drive the resistance rod to move and separate from the positioning member, and then the positioning member moves down to fix the bending rib in the limit plate, and the motor drives the movable plate and the clamping plate to move. At this time, the guide plate is used to make the clamping plate contract to clamp and fix the bending rib, thereby reducing the possibility of the bending rib falling off when bending, so it is more convenient to test the bending rib; The motor drives the movable plate and the clamping plate to move and contact with the inner wall of the guide plate, thereby causing the clamping plate to contract to clamp and fix the bending ribs. As the movable plate drives the clamping plate to move, the bending ribs are bent. At the same time, the bending ribs are tested by testing equipment to calculate the strength of the bending ribs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional structural schematic diagram of the present invention; Figure 2 It is a partial three-dimensional structural cross-sectional view of the present invention; Figure 3 It is a schematic diagram of a partial three-dimensional unfolded structure of the present invention; Figure 4 It is a partial three-dimensional expanded structural cross-sectional view of the present invention.

[0018] In the figure: 1, bottom plate; 2, limit plate; 21, through hole; 22, assembly groove; 3, positioning piece; 31, rubber plate; 32, disc; 33, first spring; 4, clamping plate; 41, upper clamping plate; 42, lower clamping plate; 43, limit groove; 44, limit rod; 45, second spring; 5, movable groove; 6, motor; 7, movable plate; 71, horizontal plate; 72, fixed plate; 8, resistance rod; 9, guide plate. DETAILED DESCRIPTION

[0019] The following is combined with Figure 1-Figure 4 The present invention is described in further detail.

[0020] Please refer to the attached figure in the instruction manual Figure 1-Figure 4 An embodiment of the present invention is a novel clamping device for testing the strength of FRP bending ribs, comprising a bottom plate 1, a limiting plate 2 is arranged on the top of the bottom plate 1, a positioning member 3 is movably inserted on the top of the limiting plate 2, a through hole 21 for assembling the bending rib is provided in the limiting plate 2, an assembly groove 22 for assembling the positioning member 3 is provided in the limiting plate 2, the bending rib can be inserted into the through hole 21 through the through hole 21, and the positioning member 3 is conveniently assembled through the assembly groove 22.

[0021] A clamping plate 4 is arranged on the top of the bottom plate 1, through which the bending ribs can be clamped and fixed; a movable groove 5 is opened in the bottom plate 1, in which a motor 6 is fixedly arranged, through which the motor 6 can be assembled.

[0022] A movable plate 7 is fixedly provided on the outer wall of the rotating shaft of the motor 6. The end of the movable plate 7 away from the motor 6 extends out of the movable groove 5 and is fixedly connected to the bottom surface of the clamping plate 4. The movable plate 7 and the clamping plate 4 are driven to move by the motor 6. As the clamping plate 4 moves, it is convenient to bend the bending ribs.

[0023] The outer wall of the rotating shaft of the motor 6 is fixedly provided with a resistance rod 8, and the resistance rod 8 abuts against the lower end of the positioning member 3. The positioning member 3 is U-shaped. One end of the positioning member 3 is inserted into the through hole 21 and fixedly provided with a rubber plate 31. The other end of the positioning member 3 is inserted into the assembly groove 22 and fixedly sleeved with a disc 32. The disc 32 is connected to the inner bottom wall of the assembly groove 22 by setting a first spring 33. The first spring 33 facilitates the pulling of the disc 32 downward, thereby prompting the positioning member 3 to drive the rubber plate 31 to move and clamp and fix the bending ribs in the limit plate 2. When the motor 6 drives the resistance rod 8 to move, it abuts against the positioning member 3, thereby prompting the positioning member 3 to drive the disc 32 and the rubber plate 31 to move upward, and prompting the rubber plate 31 to separate from the bending ribs, thereby prompting the bending ribs to lose their limit.

[0024] A guide plate 9 is fixedly provided on the top of the bottom plate 1, and an L-shaped groove is provided on the bottom of the guide plate 9. When the clamping plate 4 moves, the clamping plate 4 contracts through the L-shaped groove to clamp and fix the bending rib.

[0025] The top surface of the clamping plate 4 is slidably matched with the inner wall of the guide plate 9. The clamping plate 4 includes an upper clamping plate 41 and a lower clamping plate 42. The top surface of the lower clamping plate 42 is provided with a plurality of limiting grooves 43. A limiting rod 44 is movably arranged in the plurality of limiting grooves 43. The upper end of the limiting rod 44 is fixedly connected to the bottom surface of the upper clamping plate 41. The lower end of the limiting rod 44 is connected to the inner bottom wall of the limiting groove 43 by setting a second spring 45. The limiting groove 43 cooperates with the limiting rod 44 to facilitate the upper clamping plate 4 1 is connected with the lower clamping plate 42, and the second spring 45 facilitates the movement of the limit rod 44 and the upper clamping plate 41, thereby causing the upper clamping plate 41 to separate from the lower clamping plate 42, and then facilitates the operator to insert the bending rib between the upper clamping plate 41 and the lower clamping plate 42. When the motor 6 drives the movable plate 7 and the lower clamping plate 42 to move, the upper clamping plate 41 contacts the guide plate 9, thereby causing the upper clamping plate 41 to move downward, and then the upper clamping plate 41 and the lower clamping plate 42 cooperate to clamp and fix the bending rib.

[0026] The cross-section of the movable groove 5 is L-shaped, and the movable plate 7 includes a horizontal plate 71 and a fixed plate 72. One end of the horizontal plate 71 is fixedly connected to the rotating shaft of the motor 6, and the other end of the horizontal plate 71 is fixedly connected to the fixed plate 72. The top of the fixed plate 72 extends out of the movable groove 5 and is fixedly connected to the bottom surface of the lower clamping plate 42. The motor 6 can easily drive the horizontal plate 71 and the fixed plate 72 to move along the inner wall of the movable groove 5, and the fixed plate 72 can easily drive the lower clamping plate 42 and the upper clamping plate 41 to move. At this time, the upper clamping plate 41 is in conflict with the guide plate 9, thereby prompting the upper clamping plate 41 to move downward, and then the upper clamping plate 41 and the lower clamping plate 42 cooperate to clamp and fix the bending ribs.

[0027] The shape of the resistance rod 8 is L-shaped, and the upper end of the resistance rod 8 is chamfered. The end of the positioning member 3 that abuts against the resistance rod 8 is chamfered. By starting the motor 6, the resistance rod 8 is driven to move and separate from the positioning member 3, and then the positioning member 3 moves down and fixes the bending ribs in the limit plate 2. When the motor 6 drives the resistance rod 8 to reset and abuts against the positioning member 3, the positioning member 3 moves up and resets, and causes the rubber plate 31 to separate from the bending ribs, thereby facilitating the operator to replace the bending ribs.

[0028] In summary: first, the bending rib is inserted into the limit plate 2 through the clamping plate 4, and then the motor 6 is started to drive the resistance rod 8 to move and separate from the positioning member 3. Then the positioning member 3 moves down and fixes the bending rib in the limit plate 2, and the movable plate 7 and the clamping plate 4 are driven to move by the motor 6. At this time, the clamping plate 4 is contracted by the guide plate 9 to clamp and fix the bending rib, thereby reducing the possibility of the bending rib falling off when bending.

[0029] In order to better demonstrate a novel clamping device for testing the strength of FRP bending bars, this embodiment now proposes a novel clamping device for testing the strength of FRP bending bars and a testing method thereof, including the following steps: Step 1: First, the motor 6 is started to drive the abutment rod 8 to rotate and abut against the positioning member 3, thereby causing the positioning member 3 to move upward, and as the motor 6 runs, the clamping plate 4 is reset and separated from the guide plate 9, and then the clamping plate 4 is unfolded; Step 2: insert the bending rib into the limiting plate 2 through the clamping plate 4, then start the motor 6 to drive the abutment rod 8 to rotate, and when the abutment rod 8 moves, it separates from the positioning member 3, and then the positioning member 3 and the rubber plate 31 are pulled downward by the first spring 33, thereby fixing one end of the bending rib in the limiting plate 2; Step 3: The motor 6 drives the movable plate 7 and the clamping plate 4 to move and contact with the inner wall of the guide plate 9, thereby causing the clamping plate 4 to contract to clamp and fix the bending rib, and the movable plate 7 drives the clamping plate 4 to move to bend the bending rib; Step 4: As the bending ribs are continuously bent, the bending ribs are tested by testing equipment to calculate the strength of the bending ribs. The testing equipment uses existing equipment.

[0030] The above are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A novel clamping device for testing the strength of FRP bending bars, comprising a base plate (1), characterized in that: A limit plate (2) is arranged on the top of the bottom plate (1), a positioning piece (3) is movably inserted on the top of the limit plate (2), a clamping plate (4) is arranged on the top of the bottom plate (1), a movable groove (5) is opened in the bottom plate (1), a motor (6) is fixedly arranged in the movable groove (5), a movable plate (7) is fixedly arranged on the outer wall of the rotating shaft of the motor (6), one end of the movable plate (7) away from the motor (6) extends out of the movable groove (5) and is fixedly connected to the bottom surface of the clamping plate (4), a resisting rod (8) is fixedly arranged on the outer wall of the rotating shaft of the motor (6), the resisting rod (8) is in contact with the lower end of the positioning piece (3), a guide plate (9) is fixedly arranged on the top of the bottom plate (1), and the top surface of the clamping plate (4) is slidably matched with the inner wall of the guide plate (9).

2. The novel FRP bending reinforcement strength testing clamping device according to claim 1 is characterized in that: The limiting plate (2) is provided with a through hole (21) for assembling the bending rib.

3. The novel FRP bending reinforcement strength testing clamping device according to claim 2 is characterized in that: An assembly groove (22) for assembling the positioning member (3) is provided in the limiting plate (2).

4. The novel FRP bending reinforcement strength testing clamping device according to claim 3 is characterized in that: The positioning member (3) is U-shaped, one end of the positioning member (3) is inserted into the through hole (21) and fixedly provided with a rubber plate (31), the other end of the positioning member (3) is inserted into the assembly groove (22) and fixedly provided with a disc (32), and the disc (32) is connected to the inner bottom wall of the assembly groove (22) by providing a first spring (33).

5. The novel FRP bending reinforcement strength testing clamping device according to claim 1 is characterized in that: The clamping plate (4) comprises an upper clamping plate (41) and a lower clamping plate (42); a plurality of limit grooves (43) are provided on the top surface of the lower clamping plate (42); a plurality of limit rods (44) are movably arranged in the limit grooves (43); the upper ends of the limit rods (44) are fixedly connected to the bottom surface of the upper clamping plate (41); and the lower ends of the limit rods (44) are connected to the inner bottom wall of the limit groove (43) by means of a second spring (45).

6. The novel FRP bending reinforcement strength testing clamping device according to claim 1 is characterized in that: The cross-section of the movable groove (5) is L-shaped.

7. The novel FRP bending reinforcement strength testing clamping device according to claim 5 is characterized in that: The movable plate (7) comprises a transverse plate (71) and a fixed plate (72); one end of the transverse plate (71) is fixedly connected to the rotating shaft of the motor (6); the other end of the transverse plate (71) is fixedly connected to the fixed plate (72); the top of the fixed plate (72) extends out of the movable groove (5) and is fixedly connected to the bottom surface of the lower clamping plate (42).

8. The novel FRP bending reinforcement strength testing clamping device according to claim 1 is characterized in that: The shape of the abutment rod (8) is L-shaped, the upper end of the abutment rod (8) is chamfered, and the end of the positioning member (3) abutting against the abutment rod (8) is chamfered.

9. The novel FRP bending reinforcement strength testing clamping device according to claim 1 is characterized in that: An L-shaped groove is provided at the bottom of the guide plate (9).

10. A method for testing the new FRP bending reinforcement strength testing clamping device as claimed in any one of claims 1 to 9, characterized in that: The following steps are involved: S101: First, the motor (6) is started to drive the abutment rod (8) to rotate and abut against the positioning member (3), thereby causing the positioning member (3) to move upward, and as the motor (6) runs, the clamping plate (4) is driven to reset and separate from the guide plate (9), and then the clamping plate (4) is unfolded; S102: inserting the bending rib into the limiting plate (2) through the clamping plate (4), then starting the motor (6) to drive the abutment rod (8) to rotate, and when the abutment rod (8) moves, it separates from the positioning member (3), and then the positioning member (3) and the rubber plate (31) are pulled downward by the first spring (33), thereby fixing one end of the bending rib in the limiting plate (2); S103: The motor (6) drives the movable plate (7) and the clamping plate (4) to move and contact the inner wall of the guide plate (9), thereby causing the clamping plate (4) to contract to clamp and fix the bending rib, and the movable plate (7) drives the clamping plate (4) to move to bend the bending rib; S104: As the bending ribs are continuously bent, the bending ribs are tested by a testing device to calculate the strength of the bending ribs.

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