A clamp for steel bar pull-out test
Patent Information
- Application Number
- CN202522303686.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-30
- Publication Date
- 2026-09-25
- Estimated Expiration
- 2035-10-30
AI Technical Summary
[0003]传统夹具多采用圆环配合夹片的固定夹持结构，其夹持尺寸调节范围受限，难以灵活适配不同直径的钢筋，而且这种结构设计使得夹具在完成试验后拆卸过程较为困难繁琐
将钢筋的一端固定，然后套上拉拔仪器，之后从配合筒设有抵板一端开始将该夹具套在钢筋外壁，直至抵板抵接拉拔仪器，弹簧对第二环板施加方向朝向抵板的作用力，第二环板通过第二转板对多个推槽施加相互靠近的作用力，之后推槽带动多个夹持板相互靠近夹持钢筋，通过卡牙对钢筋牢靠夹持，从而能够灵活适配不同直径的夹具，通过拉拔仪器推动抵板向远离拉拔仪器的方向移动，然后抵板推动配合筒移动，在此过程中配合筒通过第一转板带动多个夹持板相互靠近，夹持板带动卡牙进一步固定夹持钢筋，避免卡牙和夹持板相对于钢筋滑动，从而确保牢靠固定夹持钢筋，通过提手控制两个相互远离，从而将该夹具从钢筋上快速拆下；
Smart Images
Figure CN224802798U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of steel bar pull-out test equipment, and in particular to a clamp for steel bar pull-out tests. Background Technology
[0002] In the field of construction engineering, the bond performance between steel bars and concrete is one of the key indicators to ensure the overall stability and safety of the structure, and the steel bar pull-out test is an important means of evaluating this performance. By simulating the process of steel bars being pulled out of concrete under actual stress, key parameters such as bond strength and slippage can be accurately obtained, providing important basis for engineering design, construction quality acceptance, and material performance improvement.
[0003] Traditional clamps often use a fixed clamping structure with a ring and a clamping plate. The clamping size adjustment range is limited, making it difficult to flexibly adapt to steel bars of different diameters. Moreover, this structural design makes the disassembly process of the clamp difficult and cumbersome after the test is completed.
[0004] Therefore, in view of the above situation, there is an urgent need to develop a fixture for steel bar pull-out tests to overcome the shortcomings in current practical applications. Utility Model Content
[0005] The purpose of this utility model embodiment is to provide a clamp for steel bar pull-out tests, aiming to solve the problems mentioned in the background art.
[0006] To achieve the above objectives, this utility model provides the following technical solution: A clamp for a rebar pull-out test includes a fitting cylinder. One end of the fitting cylinder is fixedly connected to a backing plate. Multiple first rotating plates are rotatably connected to the inner wall of the fitting cylinder. The first rotating plates are divided into two symmetrical groups. Clamping plates are rotatably connected between the multiple first rotating plates in the same group. Each first rotating plate away from the backing plate in each group has a push groove. The other end of the fitting cylinder is fixedly connected to a first ring plate. A second ring plate is also slidably connected to the inner wall of the fitting cylinder. A spring is fixedly installed between the second ring plate and the first ring plate. Multiple evenly distributed second rotating plates are rotatably connected to the end of the second ring plate near the backing plate. The second rotating plates correspond to the push grooves. The other end of the second rotating plate is rotatably connected to the inner wall of the corresponding push groove.
[0007] A further technical solution involves multiple first rotating plates of the same size, with the multiple first rotating plates in the same group being parallel to each other.
[0008] In a further technical solution, a third ring plate is fixedly connected to the inner wall of the mating cylinder, and the second ring plate is located between the third ring plate and the first ring plate.
[0009] In a further technical solution, multiple locking teeth are fixedly connected to one end face of each of the multiple clamping plates that are close to each other.
[0010] A further technical solution is that the cross-section of the clamping tooth is a right-angled trapezoid, and the side away from the abutment is a right angle.
[0011] In a further technical solution, a handle is fixedly connected to one end of each of the two clamping plates that is far from each other, and the handle is located on the end of the clamping plate that is far from the abutment plate.
[0012] In summary, the embodiments of this utility model have the following beneficial effects compared with the prior art: One end of the rebar is fixed, and then the pulling device is fitted onto it. Starting from the end of the mating cylinder with the abutment plate, the clamp is fitted onto the outer wall of the rebar until the abutment plate abuts against the pulling device. The spring applies a force to the second ring plate in the direction of the abutment plate. The second ring plate applies a force to multiple push grooves through the second rotating plate, causing them to move closer together. Then, the push grooves drive multiple clamping plates to move closer together and clamp the rebar. The rebar is securely clamped by the jaws, which can flexibly adapt to clamps of different diameters. The pulling device pushes the abutment plate to move away from the pulling device. Then, the abutment plate pushes the mating cylinder to move. During this process, the mating cylinder drives multiple clamping plates to move closer together through the first rotating plate. The clamping plates drive the jaws to further fix the clamped rebar, preventing the jaws and clamping plates from sliding relative to the rebar, thus ensuring a secure clamping of the rebar. The handle controls the two to move away from each other, thus quickly removing the clamp from the rebar. The sliding range of the second ring plate is limited by the third ring plate, thereby ensuring that the spring always applies a force to the second ring plate in the direction of the abutment plate. Then, the second ring plate applies a force to multiple push grooves to bring them closer together through the second rotating plate. Then, the push grooves drive multiple clamping plates to bring them closer together to clamp the steel bars, thereby ensuring that the teeth abut the steel bars.
[0013] To more clearly illustrate the structural features and effects of this utility model, the following detailed description is provided in conjunction with the accompanying drawings and specific embodiments. Attached Figure Description
[0014] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This utility model Figure 1 A schematic diagram of the three-dimensional cross-section structure; Figure 3 This is a three-dimensional structural diagram of the internal structure of the mating cylinder of this utility model.
[0015] In the diagram: 1. Fitting cylinder; 2. Support plate; 3. First ring plate; 4. First rotating plate; 5. Clamping plate; 6. Push groove; 7. Second rotating plate; 8. Second ring plate; 9. Spring; 10. Clamping tooth; 11. Third ring plate. Detailed Implementation
[0016] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.
[0017] The specific implementation of this utility model will be described in detail below with reference to specific embodiments.
[0018] like Figures 1-3 As shown, this utility model embodiment provides a clamp for a rebar pull-out test, including a fitting cylinder 1. One end of the fitting cylinder 1 is fixedly connected to a backing plate 2. Multiple first rotating plates 4 are rotatably connected to the inner wall of the fitting cylinder 1. The first rotating plates 4 are divided into two symmetrical groups. Clamping plates 5 are rotatably connected between the multiple first rotating plates 4 in the same group. The rebar is fixedly clamped by the cooperation of the multiple clamping plates 5. Each group of first rotating plates 4 away from the backing plate 2 has a push groove 6. The inner wall of the other end of the fitting cylinder 1 is fixedly connected to a first ring plate 3. The inner wall of the fitting cylinder 1 is also slidably connected to a second ring plate 8. A spring 9 is fixedly provided between the second ring plate 8 and the first ring plate 3. Multiple evenly distributed second rotating plates 7 are rotatably connected to the end of the second ring plate 8 near the backing plate 2. The second rotating plates 7 correspond to the push grooves 6. The other end of the second rotating plates 7 is rotatably connected to the inner wall of the corresponding push groove 6.
[0019] Furthermore, the multiple first rotating plates 4 are of the same size, and the multiple first rotating plates 4 in the same group are parallel to each other.
[0020] Furthermore, a third ring plate 11 is fixedly connected to the inner wall of the mating cylinder 1, and the second ring plate 8 is located between the third ring plate 11 and the first ring plate 3. The sliding range of the second ring plate 8 is limited by the third ring plate 11, thereby ensuring that the spring 9 always applies a force to the second ring plate 8 in the direction of the abutment plate 2. The second ring plate 8 applies a force to the multiple push grooves 6 through the second rotating plate 7, and the push grooves 6 drive the multiple clamping plates 5 to move closer to each other to clamp the reinforcing bars.
[0021] Furthermore, multiple clamping plates 5 are fixedly connected to one end face of each other, and the clamping teeth 10 increase the gripping force on the reinforcing bar. For example, the clamping teeth 10 abut against the ribs of the reinforcing bar.
[0022] Furthermore, the cross-section of the locking tooth 10 is a right-angled trapezoid, and the side away from the abutment plate 2 is a right angle.
[0023] Furthermore, each of the two clamping plates 5 is fixedly connected to a handle (not shown in the figure) at one end away from each other, and the handle is located at the end of the clamping plate 5 away from the abutment plate 2. The handle can be used to control the two clamping plates 5 to move away from each other, thereby making it easier to remove the clamp from the steel bar.
[0024] In this embodiment of the utility model, one end of the reinforcing bar is fixed, and then a pulling device is fitted onto it. Starting from the end of the mating cylinder 1 with the abutment plate 2, the clamp is fitted onto the outer wall of the reinforcing bar until the abutment plate 2 abuts against the pulling device. The spring 9 applies a force to the second ring plate 8 in the direction of the abutment plate 2. The second ring plate 8, through the second rotating plate 7, applies a force to the multiple push grooves 6, causing them to move closer together. The push grooves 6 then drive the multiple clamping plates 5 to move closer together and clamp the reinforcing bar. The clasps 10 securely clamp the reinforcing bar, thus allowing for flexible adaptation to clamps of different diameters. The pulling device pushes the abutment plate 2 away from the pulling device, and then the abutment plate 2 pushes the mating cylinder 1 to move. During this process, the mating cylinder... 1. The first rotating plate 4 drives multiple clamping plates 5 to move closer to each other. The clamping plates 5 drive the jaws 10 to further fix the clamped steel bars, preventing the jaws 10 and clamping plates 5 from sliding relative to the steel bars, thus ensuring that the steel bars are firmly fixed. The handle controls the two 5 to move away from each other, thus quickly removing the clamp from the steel bars. The third ring plate 11 limits the sliding range of the second ring plate 8, thus ensuring that the spring 9 always applies a force to the second ring plate 8 in the direction of the abutment plate 2. Then, the second ring plate 8 applies a force to multiple push grooves 6 to move closer to each other through the second rotating plate 7. Then, the push grooves 6 drive multiple clamping plates 5 to move closer to each other to clamp the steel bars, thus ensuring that the jaws 10 abut against the steel bars.
[0025] The working principle of this utility model is as follows: one end of the steel bar is fixed, and then a pulling instrument is fitted on it. Then, starting from the end of the fitting cylinder 1 with the abutment plate 2, the clamp is fitted onto the outer wall of the steel bar until the abutment plate 2 abuts against the pulling instrument. The spring 9 applies a force to the second ring plate 8 in the direction of the abutment plate 2. The second ring plate 8 applies a force to multiple push grooves 6 through the second rotating plate 7, which then pushes multiple clamping plates 5 to move closer to each other and clamp the steel bar. The steel bar is securely clamped by the jaws 10. Then, the pulling instrument pushes the abutment plate 2 to move away from the pulling instrument. Then, the abutment plate 2 pushes the fitting cylinder 1 to move. During this process, the fitting cylinder 1 drives multiple clamping plates 5 to move closer to each other through the first rotating plate 4. The clamping plates 5 drive the jaws 10 to further fix and clamp the steel bar, preventing the jaws 10 and clamping plates 5 from sliding relative to the steel bar. After the steel bar pulling test is completed, the pulling instrument is controlled to reset. Then, the two clamping plates 5 are controlled to move away from each other by the handle, thereby removing the clamp from the steel bar.
[0026] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A clamp for a steel bar pull-out test, comprising a fitting sleeve (1), characterized in that, One end of the fitting cylinder (1) is fixedly connected to a stop plate (2). Multiple first rotating plates (4) are rotatably connected to the inner wall of the fitting cylinder (1). The first rotating plates (4) are divided into two symmetrical groups. Clamping plates (5) are rotatably connected between the multiple first rotating plates (4) in the same group. Push grooves (6) are opened on the first rotating plates (4) away from the stop plate (2) in each group. The inner wall of the other end of the fitting cylinder (1) is fixedly connected to a first ring plate (3). The inner wall of the fitting cylinder (1) is also slidably connected to a second ring plate (8). A spring (9) is fixedly provided between the second ring plate (8) and the first ring plate (3). Multiple evenly distributed second rotating plates (7) are rotatably connected to the end of the second ring plate (8) near the stop plate (2). The second rotating plate (7) corresponds to the push groove (6). The other end of the second rotating plate (7) is rotatably connected to the inner wall of the corresponding push groove (6).
2. The clamp for rebar pull-out testing according to claim 1, characterized in that, Multiple first rotating plates (4) are the same size, and multiple first rotating plates (4) in the same group are parallel to each other.
3. The clamp for rebar pull-out testing according to claim 1, characterized in that, The inner wall of the fitting cylinder (1) is also fixedly connected to a third ring plate (11), and the second ring plate (8) is located between the third ring plate (11) and the first ring plate (3).
4. The clamp for rebar pull-out testing according to claim 1, characterized in that, Multiple clamping plates (5) are fixedly connected to one end face of each other with multiple locking teeth (10).
5. The clamp for rebar pull-out testing according to claim 4, characterized in that, The cross section of the tooth (10) is a right trapezoid, and the side away from the abutment plate (2) is a right angle.
6. The clamp for rebar pull-out testing according to claim 1, characterized in that, Each of the two clamping plates (5) is fixedly connected to a handle at one end away from the other, and the handle is located on the clamping plate (5) at the end away from the abutment plate (2).