A clamp for reinforcing bar drawing detection

Abstract

The utility model provides a kind of clamp for steel bar drawing detection, including sleeve with central hole, multiple chutes are equipped with interval on sleeve, chuck block is respectively equipped with in chute, part chuck block extends into central hole and the moving direction of chuck block is identical with the radial of central hole, chuck block side away from central hole is equipped with variable diameter part, sleeve is also equipped with wedge, the moving direction of wedge is identical with the axial direction of central hole and wedge and variable diameter part one-to-one corresponding abut, sleeve is also equipped with threaded rod and reset spring, the axial direction of threaded rod is identical with the axial direction of central hole and threaded rod is equipped with the thread sleeve matched with threaded rod on, thread sleeve and reset spring respectively with the opposite ends of wedge one-to-one corresponding abut.The utility model solves the technical problem that drawing device general performance is not good and briquetting is easy to lose, generates the technical effect that can hold multiple sizes of steel bar, general performance is good, chuck block is installed on sleeve and does not need to be taken off from sleeve in use process, can prevent chuck block loss.

Description

Technical Field

[0001] This utility model relates to the field of rebar pull-out testing technology, and in particular to a clamp for rebar pull-out testing. Background Technology

[0002] Rebar pull-out testing is a method used to assess the anchorage bearing capacity of reinforcing bars in concrete structures. It evaluates the bond strength between the reinforcing bar and the concrete by applying tensile force. When performing pull-out testing on reinforcing bars fixed in walls or the ground, clamps are used to hold the bars, and then tools such as jacks are used to push the clamps to pull the bars out.

[0003] Chinese utility model patent CN215965547U discloses a rebar pulling device for traffic engineering construction. It includes a base plate with insertion holes on its outer surface and a threaded rod with a threaded sleeve threaded to its outer surface. Positioning cylinders for fixing are fixedly connected to both sides of the outer surface of the base plate. A guide rod for auxiliary sliding is inserted into the inner wall of the positioning cylinder. A guide cylinder for guiding is sleeved on the outer surface of the guide rod. A sleeve for fixing is fixedly connected to one side of the guide cylinder. A positioning sleeve for installation is threaded to the inner wall of the sleeve. A guide groove for pressing is formed on the inner side wall of the positioning sleeve. A pressing block for pressing is inserted into the inner wall of the guide groove. This rebar pulling device, through the cooperation of the guide groove and the pressing block, can press the rebar by utilizing the sliding of the pressing block in the guide groove. Furthermore, when pulling outwards, the rebar will only be pulled tighter, thus ensuring the stability of the device.

[0004] The pull-out device disclosed in the above-mentioned utility model patent clamps the steel bar by pressing the pressure block inserted into the inner wall of the guide groove. The shape of the pressure block needs to be adapted to the size of the steel bar. When testing steel bars of different sizes, the corresponding pressure block needs to be replaced, which is not very versatile. In addition, the pressure block is only inserted into the guide groove. When the steel bar is pulled out, the pressure block is easy to fall off the positioning sleeve and be lost. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a clamp for detecting steel bar pull-out, which solves the problems of poor versatility of pull-out devices and easy loss of pressure blocks in existing technologies.

[0006] According to an embodiment of this utility model, a clamp for testing the pull-out of reinforcing bars includes a sleeve with a central hole. Multiple grooves, each corresponding to and communicating with the central hole, are spaced circumferentially on the sleeve. Movable clamping blocks are respectively provided within each groove. Part of each clamping block extends into the central hole, and the direction of movement of the clamping block is consistent with the radial direction of the central hole. A variable diameter portion is provided on the side of each clamping block away from the central hole. The sleeve also provides multiple movable wedges, the number of which is the same as the number of clamping blocks. The direction of movement of each wedge is consistent with the axial direction of the central hole, and each wedge abuts against the variable diameter portion. The sleeve further provides a threaded rod and a return spring. The axial direction of the threaded rod is consistent with the axial direction of the central hole, and a threaded sleeve that cooperates with the threaded rod is provided on the threaded rod. The threaded sleeve and the return spring abut against the opposite ends of each wedge.

[0007] Furthermore, the sleeve is also provided with an outer shell that is threadedly connected to the sleeve. The outer shell is provided with a through hole concentric with the central hole. The outer shell covers the opening on one side of the slide groove, and the wedge block and the return spring are respectively located between the outer shell and the sleeve.

[0008] Furthermore, one end of the threaded rod is provided with a connecting cylinder, the connecting cylinder is threadedly connected to the outer casing, and the sleeve is pressed against the connecting cylinder by the outer casing.

[0009] Furthermore, the connecting cylinder is provided with a plurality of guide grooves spaced circumferentially along the central hole, and the wedge blocks are respectively arranged in the guide grooves.

[0010] Furthermore, a limiting seat is threadedly connected to the end of the threaded rod away from the sleeve, and the threaded sleeve is located between the connecting cylinder and the limiting seat.

[0011] Furthermore, the limiting seat is provided with a plurality of mounting portions spaced circumferentially along the threaded rod, and each mounting portion is provided with a through mounting hole.

[0012] Furthermore, the clamping blocks are provided with serrated portions, which are located on the portions of the clamping blocks that extend into the central hole.

[0013] Furthermore, a handle is provided on the outer peripheral wall of the threaded sleeve, and the handle extends radially away from the threaded sleeve.

[0014] Compared with existing technologies, this utility model has the following advantages: By using a central hole on the sleeve for the reinforcing bar to be tested to pass through, after the reinforcing bar enters the central hole, rotating the threaded sleeve causes the threaded sleeve to move axially along the threaded rod. As the threaded sleeve moves, it pushes a wedge block to move, and the movement of the wedge block pushes a clamping block to move radially along the central hole until the clamping block clamps the reinforcing bar. Furthermore, the return spring is further compressed when the wedge block moves. By controlling the stroke of the threaded sleeve, the distance the clamping block moves can be adjusted, allowing the clamping block to clamp reinforcing bars of various diameters. The position of the clamping block is locked by the cooperation between the threaded sleeve and the threaded rod, ensuring the clamping block... During the testing process, the clamping block is kept in the position that holds the reinforcing bar to prevent it from sliding relative to the reinforcing bar. After the test is completed, the threaded sleeve is rotated to move the threaded sleeve in the opposite direction along the axial direction of the threaded rod. As the threaded sleeve moves, the reset spring returns to its original length and pushes the wedge block to move in the opposite direction, so that the clamping block can move radially away from the reinforcing bar along the central hole. At this time, the reinforcing bar can be pulled out from the central hole. This solves the technical problems of poor versatility of the pulling device and easy loss of the clamping block. It produces the technical effect of being able to clamp reinforcing bars of various sizes and having good versatility. The clamping block is installed on the sleeve and does not need to be removed from the sleeve during use, which can prevent the clamping block from being lost. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a steel bar pull-out testing fixture according to an embodiment of the present invention;

[0016] Figure 2 This is a cross-sectional view of a steel bar pull-out testing fixture according to an embodiment of the present invention;

[0017] Figure 3 An exploded view of a steel bar pull-out test fixture according to an embodiment of this utility model.

[0018] In the above figures: 1. Sleeve; 11. Center hole; 12. Slide groove; 2. Clamping block; 21. Variable diameter part; 22. Serrated part; 3. Wedge block; 4. Threaded rod; 41. Connecting cylinder; 42. Guide groove; 43. Limiting seat; 44. Mounting part; 45. Mounting hole; 5. Return spring; 6. Threaded sleeve; 61. Handle; 7. Outer shell; 71. Through hole. Detailed Implementation

[0019] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0020] like Figures 1 to 3 As shown in the figure, this utility model embodiment proposes a clamp for testing rebar pull-out, which is installed on a tool such as a jack and is used to clamp the rebar during the rebar pull-out test, so that when the clamp for testing rebar pull-out moves under the push of the jack, it applies a pulling force to the clamped rebar.

[0021] Please refer to Figure 1 , Figure 2 and Figure 3 The rebar pull-out test fixture includes a sleeve 1 with a central hole 11 through which the rebar to be tested passes. The sleeve 1 has multiple grooves 12 spaced circumferentially around the central hole 11, each corresponding to and communicating with the central hole 11. Movable clamping blocks 2 are respectively provided in each groove 12. Part of the clamping blocks 2 extend into the central hole 11, and the moving direction of the clamping blocks 2 is consistent with the radial direction of the central hole 11. A reducing section 21 is provided on the side of the clamping block 2 away from the central hole 11. The sleeve 1 also has multiple movable wedges 3, the number of which is the same as the number of clamping blocks 2. The moving direction of the wedges 3 is consistent with the radial direction of the central hole 11. The central hole 11 is axially aligned, and the wedge block 3 and the variable diameter part 21 are in one-to-one contact, so that when the wedge block 3 moves on the sleeve 1, it can push the clamping block 2 to move radially along the central hole 11. The sleeve 1 is also provided with a threaded rod 4 and a return spring 5. The axial direction of the threaded rod 4 is aligned with the axial direction of the central hole 11, and the threaded rod 4 is provided with a threaded sleeve 6 that cooperates with the threaded rod 4. The threaded sleeve 6 and the return spring 5 are respectively in one-to-one contact with the opposite ends of the wedge block 3. Rotating the threaded sleeve can cause the threaded sleeve 6 to move radially along the threaded rod 4 and push the wedge block 3 to move, thereby driving the clamping block 2 to move.

[0022] Specifically, the operation steps for performing pull-out testing on reinforcing bars using the reinforcing bar pull-out testing fixture provided in this embodiment are as follows: First, install the reinforcing bar pull-out testing fixture onto the jack. Then, pass the reinforcing bar to be tested through the central hole 11. After the reinforcing bar enters the central hole 11, rotate the threaded sleeve 6 so that the threaded sleeve 6 moves along the axial direction of the threaded rod 4 towards the sleeve 1. When the threaded sleeve 6 moves, it pushes the wedge block 3 to move, and the movement of the wedge block 3 pushes the clamping block 2 to move radially along the central hole 11 towards the reinforcing bar until the clamping block 2 clamps the reinforcing bar. When the wedge block 3 moves... The return spring 5 is further compressed. At this time, the clamping block 2 is held in the position of clamping the steel bar by the cooperation of the threaded sleeve 6 and the threaded rod 4. The steel bar pull-out detection fixture can be moved by operating the jack to apply a pulling force to the steel bar clamped by the clamping block 2 for detection. After the detection is completed, the threaded sleeve 6 is rotated to move the threaded sleeve 6 away from the sleeve 1 along the axial direction of the threaded rod 4. As the threaded sleeve 6 moves, the return spring 5 returns to its original length and pushes the wedge block 3 to move in the opposite direction, so that the clamping block 2 can move away from the steel bar along the radial direction of the central hole 11. At this time, the steel bar can be pulled out from the central hole 11. The steel bar pull-out testing fixture provided in this embodiment can adjust the distance the clamping block 2 moves by controlling the stroke of the threaded sleeve 6, so that the clamping block 2 can clamp steel bars of various diameters. When testing steel bars of different sizes, there is no need to replace the clamping block 2, which has good versatility. Moreover, the clamping block 2 is installed on the sleeve 1, so there is no need to remove the clamping block 2 from the sleeve 1 during use, which can effectively prevent the clamping block 2 from falling off or being lost.

[0023] like Figure 2 and Figure 3 As shown, the sleeve 1 is further provided with an outer shell 7 threadedly connected to the sleeve 1. The outer shell 7 has a through hole 71 concentric with the central hole 11. The outer shell 7 covers the opening on one side of the slide groove 12, and the wedge block 3 and the return spring 5 are respectively located between the outer shell 7 and the sleeve 1. The outer shell 7 is threadedly connected to the sleeve 1 to fix the outer shell 7 on the sleeve 1. When assembling the steel bar pull-out detection fixture, the clamping block 2 is first inserted into the slide groove 12, and then the outer shell 7 is installed on the sleeve 1 to prevent the clamping block 2 from detaching from the sleeve 1. The wedge block 3 and the return spring 5 are installed between the outer shell 7 and the sleeve 1 to reduce external interference and thus ensure the structural stability of the steel bar pull-out detection fixture.

[0024] Please combine Figure 2 and Figure 3One end of the threaded rod 4 is provided with a connecting sleeve 41, which is threadedly connected to the outer casing 7, and the sleeve 1 is pressed against the connecting sleeve 41 by the outer casing 7. The connecting sleeve 41 is provided at one end of the threaded rod 4 and threadedly connected to the outer casing 7 to install the threaded rod 4 onto the sleeve 1, and the sleeve 1 is located within the space enclosed by the outer casing 7 and the connecting sleeve 41, ensuring a tight fit between the threaded rod 4 and the sleeve 1.

[0025] In detail, the connecting cylinder 41 is provided with a plurality of guide grooves 42 spaced circumferentially along the central hole 11, and the wedge blocks 3 are respectively disposed in the guide grooves 42. The guide grooves 42 on the connecting cylinder 41 cooperate with the wedge blocks 3 to restrict the movement direction of the wedge blocks 3, prevent the wedge blocks 3 from deviating from the preset direction when moving, and improve the stability of the clamping block 2 when it moves under the push of the wedge blocks 3.

[0026] like Figure 3 As shown, the end of the threaded rod 4 furthest from the sleeve 1 is threadedly connected to a limiting seat 43, and the threaded sleeve 6 is located between the connecting cylinder 41 and the limiting seat 43. The limiting seat 43 is used to limit the travel of the threaded sleeve 6 on the threaded rod 4, preventing the threaded sleeve 6 from disengaging from the threaded rod 4 during rotation, thereby preventing the threaded sleeve 6 from falling off the threaded rod 4 and ensuring the structural integrity of the fixture for rebar pull-out testing.

[0027] In this embodiment, the limiting seat 43 is provided with a plurality of mounting portions 44 spaced circumferentially along the threaded rod 4, and each mounting portion 44 is provided with a through mounting hole 45. By providing a plurality of mounting portions 44 on the limiting seat 43 and providing mounting holes 45 on the mounting portions 44, after the rebar pull-out detection clamp is placed on the jack, bolts can be passed through the mounting holes 45 to connect with the jack to fix the rebar pull-out detection clamp on the jack, so that the connection between the rebar pull-out detection clamp and the jack is reliable and the rebar pull-out detection clamp is prevented from detaching from the jack during the detection process.

[0028] like Figure 2 As shown, the clamping block 2 is provided with serrated portions 22, which are located on the portion of the clamping block 2 that extends into the central hole 11. The serrated portions 22 are used to increase the friction between the clamping block 2 and the reinforcing bar, making the clamping block 2 clamp the reinforcing bar more firmly and preventing the clamping block 2 from sliding relative to the reinforcing bar when it is pulled during the testing process, which would cause inaccurate test results.

[0029] Please refer to Figure 3A handle 61 is provided on the outer peripheral wall of the threaded sleeve 6, and the handle 61 extends radially away from the threaded sleeve 6. The handle 61 on the threaded sleeve 6 facilitates rotation of the threaded sleeve 6, causing it to move radially along the threaded rod 4. This facilitates the operation of the rebar pull-out detection fixture and ensures that the threaded sleeve 6 moves to the position where the locking block abuts against the rebar during operation, thereby improving the reliability of the rebar pull-out detection fixture.

[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A clamp for testing the pull-out properties of reinforcing bars, comprising a sleeve with a central hole, characterized in that: The sleeve is provided with a plurality of sliding grooves at intervals along the circumference of the central hole, each corresponding to and communicating with the central hole. Movable clamping blocks are provided in each of the sliding grooves. Part of the clamping blocks extend into the central hole, and the direction of movement of the clamping blocks is consistent with the radial direction of the central hole. A variable diameter section is provided on the side of each clamping block away from the central hole. The sleeve is also provided with a plurality of movable wedges, the number of which is the same as the number of clamping blocks. The direction of movement of the wedges is consistent with the axial direction of the central hole, and each wedge abuts against the variable diameter section. The sleeve is also provided with a threaded rod and a return spring. The axial direction of the threaded rod is consistent with the axial direction of the central hole, and a threaded sleeve that mates with the threaded rod is provided on the threaded rod. The threaded sleeve and the return spring abut against the opposite ends of each wedge.

2. The fixture for testing the pull-out of reinforcing bars as described in claim 1, characterized in that: The sleeve is also provided with an outer shell that is threadedly connected to the sleeve. The outer shell is provided with a through hole concentric with the central hole. The outer shell covers the opening on one side of the slide groove, and the wedge block and the return spring are respectively located between the outer shell and the sleeve.

3. A clamp for testing the pull-out of reinforcing bars as described in claim 2, characterized in that: One end of the threaded rod is provided with a connecting cylinder, the connecting cylinder is threadedly connected to the outer shell, and the sleeve is pressed against the connecting cylinder by the outer shell.

4. A clamp for testing the pull-out of reinforcing bars as described in claim 3, characterized in that: The connecting cylinder is provided with multiple guide grooves spaced circumferentially along the central hole, and the wedge blocks are respectively arranged in the guide grooves.

5. A clamp for testing the pull-out of reinforcing bars as described in claim 3, characterized in that: The threaded rod is threaded to a limiting seat at one end away from the sleeve, and the threaded sleeve is located between the connecting cylinder and the limiting seat.

6. A clamp for testing the pull-out of reinforcing bars as described in claim 5, characterized in that: The limiting seat is provided with a plurality of mounting portions spaced circumferentially along the threaded rod, and each mounting portion is provided with a through mounting hole.

7. A clamp for testing the pull-out of reinforcing bars as described in claim 1, characterized in that: The clamping blocks are respectively provided with serrated portions, which are located on the portions of the clamping blocks that extend into the central hole.

8. A clamp for testing the pull-out of reinforcing bars as described in claim 1, characterized in that: The threaded sleeve has a handle on its outer peripheral wall, and the handle extends radially away from the threaded sleeve.

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