Device for pre-tightening UHPC-NC interlayer pull-out test
The clamping unit of the pre-tightened UHPC-NC interlayer pull-out test device achieves stable fixation without adhesive bonding, solving the problem of premature failure of the adhesive interface between steel plate and concrete in the prior art and ensuring the accuracy of test results.
Patent Information
- Application Number
- CN202520421885.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-11
- Publication Date
- 2026-02-17
- Estimated Expiration
- 2035-03-11
AI Technical Summary
In the prior art, due to the relatively weak bonding strength of the adhesive, the interface between the steel plate and the concrete may be damaged prematurely during the test, resulting in the test results failing to accurately reflect the true bonding strength of the concrete interface, and making it difficult to obtain actual experimental results.
A pre-tightened UHPC-NC interlayer pull-out test device is used. The device includes two spaced clamping units. Each clamping unit consists of a connecting mechanism and a clamping mechanism. The clamping mechanism fixes the test piece through a clamping plate and a clamping assembly. The clamping plate is movably connected to the connecting mechanism. The clamping assembly abuts against the outside of the clamping plate to achieve stable fixation without adhesive bonding.
The clamping process is more convenient and stable, avoiding damage to the adhesive interface and ensuring that the test results accurately reflect the true bond strength of the concrete interface, thus solving the problem of inaccurate test results in the existing technology.
Smart Images
Figure CN223926258U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of concrete interlayer bond strength testing technology, specifically to a device for pre-tightened UHPC-NC interlayer pull-out test. Background Technology
[0002] UHPC, as a cutting-edge high-performance building material, has demonstrated broad application potential in bridge reinforcement and road repair. In these applications, the interfacial bond strength of concrete, as a key indicator of the integrity and durability of concrete structures, is of paramount importance.
[0003] In existing technologies, it is usually necessary to use adhesive to bond the steel plate to the UHPC and NC surfaces, and then use a testing machine to clamp the steel plate and conduct a pull-out test.
[0004] However, due to the relatively weak bonding strength of the adhesive, the bonding interface between the steel plate and the concrete may fail prematurely during the test, resulting in the test results failing to accurately reflect the true bonding strength of the concrete interface and making it difficult to obtain actual experimental results. Utility Model Content
[0005] This application provides a device for interlayer pull-out testing of pre-tightened UHPC-NC, which can solve the problem in the prior art where the adhesive bonding strength is relatively weak, the bonding interface between the steel plate and the concrete may be damaged prematurely during the test, resulting in the test results not being able to accurately reflect the true bonding strength of the concrete interface and making it difficult to obtain actual experimental results.
[0006] In a first aspect, embodiments of this application provide an apparatus for a pre-tensioned UHPC-NC interlaminar pull-out test, comprising: two spaced-apart clamping units, each clamping unit comprising:
[0007] The connecting mechanism has one end for connecting to the testing machine and the other end for attaching to the test piece;
[0008] A clamping mechanism includes a clamping plate and a clamping assembly. The clamping plate is arranged circumferentially along the test piece and is movably connected to the connecting mechanism. The clamping assembly abuts against the outside of the clamping plate to press the clamping plate onto the test piece to fix the test piece.
[0009] In one embodiment, the connecting mechanism includes:
[0010] A connecting plate, one side of which is attached to the test piece, and the connecting plate is movably connected to the clamping plate;
[0011] A clamping rod is located on the other side of the connecting plate and is used to connect to the testing machine.
[0012] In one embodiment, the clamping mechanism includes four clamping plates, the connecting plate has a cross-shaped cross section, the connecting plate includes a central rectangular portion and four extension portions, the central rectangular portion is used to connect the test piece, the extension portions correspond one-to-one with the clamping plates, the extension portions are provided with at least one T-shaped sliding hole, and the clamping plates are provided with T-shaped sliders corresponding to the T-shaped sliding holes.
[0013] In one embodiment, the clamping assembly includes two sets of clamping units arranged in a cross configuration. Each clamping unit includes at least one U-shaped clamp that abuts against a clamping plate to press two opposing clamping plates onto the test piece.
[0014] In one embodiment, the U-shaped clamp includes:
[0015] A U-shaped steel plate, one of the inner sides of which is used to abut against a clamping plate on one side of the test piece;
[0016] A clamping assembly is disposed on the other side wall of the U-shaped steel plate and is movable relative to the side wall of the U-shaped steel plate to abut against a clamping plate on the other side of the test piece.
[0017] In one embodiment, the clamping assembly includes:
[0018] A pressure plate is located inside the side wall of the U-shaped steel plate and is used to abut against the corresponding clamping plate;
[0019] An adjusting rod, which is connected to the pressure plate and threaded to the side wall of the U-shaped steel plate, is used to adjust the clamping force of the pressure plate on the test piece by rotation.
[0020] In one embodiment, a rubber sheet is provided on the inner side of one side wall of the U-shaped steel plate, the rubber sheet being used to abut against a clamping plate on one side of the test piece.
[0021] In one embodiment, a U-shaped connecting platform is provided on the other side of the connecting plate, the groove at the opening of the U-shaped connecting platform is T-shaped, and the end shape of the clamping rod matches the shape of the groove.
[0022] In one embodiment, the clamping unit perpendicular to the slide groove direction includes two U-shaped clamps, which are spaced apart along the slide groove direction and located on both sides of the clamping rod to limit the position of the clamping rod within the slide groove.
[0023] In one embodiment, the clamping plate has the same thickness as the T-shaped slider and is less than the length of the T-shaped sliding hole.
[0024] The beneficial effects of the technical solutions provided in this application include:
[0025] When using the apparatus for pre-tensioned UHPC-NC interlaminar pull-out tests, one end of the connecting mechanism is connected to the testing machine, and the test specimen is attached to the other end of the connecting mechanism. The clamping plate is arranged circumferentially along the test specimen and is movably connected to the connecting mechanism, meaning the clamping plate can move relative to the connecting mechanism in a direction closer to or further away from the test specimen. The clamping assembly abuts against the outside of the clamping plate to press the clamping plate onto the test specimen, thus fixing the test specimen. Because the clamping plate is movably connected to the connecting mechanism, and the clamping assembly abuts against the outside of the clamping plate to press the clamping plate onto the test specimen, thus fixing the test specimen, the clamping process is more convenient and has higher stability. It eliminates the need for adhesive bonding, solving the problem in existing technologies where the adhesive bonding strength is relatively weak, potentially leading to premature failure of the steel plate-concrete interface during the test, resulting in test results that cannot accurately reflect the true bond strength of the concrete interface and making it difficult to obtain actual experimental results. Attached Figure Description
[0026] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0027] Figure 1 This is a schematic diagram of an embodiment of the device for pre-tightened UHPC-NC interlayer pull-out test according to the present invention.
[0028] Figure 2 This is a side view of an embodiment of the device for pre-tightened UHPC-NC interlayer pull-out test according to the present invention.
[0029] Figure 3 This is a schematic diagram of the clamping unit in an embodiment of the device for pre-tightened UHPC-NC interlayer pull-out test according to this utility model.
[0030] Figure 4 This is a schematic diagram of the connecting mechanism in an embodiment of the device for pre-tightened UHPC-NC interlayer pull-out test according to this utility model.
[0031] Figure 5 This is a schematic diagram of the connecting plate in an embodiment of the device for pre-tightened UHPC-NC interlayer pull-out test according to this utility model.
[0032] Figure 6This is a schematic diagram of the clamping plate in an embodiment of the device for pre-tightened UHPC-NC interlayer pull-out test according to this utility model.
[0033] Figure 7 This is a schematic diagram of the U-shaped clamp in an embodiment of the device for pre-tightened UHPC-NC interlayer pull-out test according to this utility model.
[0034] In the figure: 1. Connecting mechanism; 11. Connecting plate; 111. T-shaped sliding hole; 112. U-shaped connecting platform; 12. Clamping rod; 2. Test piece; 3. Clamping mechanism; 31. Clamping plate; 311. T-shaped slider; 32. Clamping assembly; 4. U-shaped clamp; 41. U-shaped steel plate; 42. Pressing assembly; 421. Pressure plate; 422. Adjusting rod; 423. Handle; 43. Rubber sheet. Detailed Implementation
[0035] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.
[0036] This application provides an apparatus for interlayer pull-out testing of pre-tightened UHPC-NC, which can solve the problem in the prior art where the adhesive bonding strength is relatively weak, the bonding interface between the steel plate and the concrete may be damaged prematurely during the test, resulting in the test results not being able to accurately reflect the true bonding strength of the concrete interface and making it difficult to obtain actual experimental results.
[0037] like Figure 1 and Figure 2 As shown, this application provides an apparatus for pre-tensioned UHPC-NC interlaminar pull-out testing, comprising: two spaced-apart clamping units, each clamping unit including:
[0038] The connecting mechanism 1 has one end for connecting to the testing machine and the other end for attaching to the test piece 2;
[0039] The clamping mechanism 3 includes a clamping plate 31 and a clamping assembly 32. The clamping plate 31 is arranged circumferentially along the test piece 2 and is movably connected to the connecting mechanism 1. The clamping assembly 32 abuts against the outside of the clamping plate 31 to press the clamping plate 31 onto the test piece 2 to fix the test piece 2.
[0040] When using the apparatus for pre-tensioned UHPC-NC interlaminar pull-out tests, one end of the connecting mechanism 1 is connected to the testing machine, and the test piece 2 is attached to the other end of the connecting mechanism 1. The clamping plate 31 is arranged circumferentially along the test piece 2 and is movably connected to the connecting mechanism 1, meaning that the clamping plate 31 can move relative to the connecting mechanism 1 in a direction closer to or further away from the test piece 2. The clamping assembly 32 abuts against the outside of the clamping plate 31 to press the clamping plate 31 onto the test piece 2 to fix the test piece 2. Because the clamping plate 31 is movably connected to the connecting mechanism 1, and the clamping assembly 32 abuts against the outside of the clamping plate 31 to press the clamping plate 31 onto the test piece 2 to fix the test piece 2, the clamping process is more convenient and has higher stability. It eliminates the need for adhesive bonding, solving the problem in existing technologies where the adhesive bonding strength is relatively weak, potentially leading to premature failure of the steel plate-concrete bonding interface during the test, resulting in test results that cannot accurately reflect the true bonding strength of the concrete interface and making it difficult to obtain actual experimental results.
[0041] In this example, the clamping plate 31 has an anti-slip pad on the side closest to the test piece 2.
[0042] like Figure 3 and Figure 5 As shown, in some optional embodiments, the connecting mechanism 1 includes:
[0043] The connecting plate 11 has one side for attaching to the test piece 2, and the connecting plate 11 is movably connected to the clamping plate 31.
[0044] Clamping rod 12 is located on the other side of connecting plate 11 and is used to connect to the testing machine.
[0045] In this embodiment, the structure of the connecting mechanism 1 is specifically described. The connecting mechanism 1 includes a connecting plate 11 and a clamping rod 12. One side of the connecting plate 11 is used to attach to the test piece 2. The connecting plate 11 is movably connected to the clamping plate 31. The clamping rod 12 is disposed on the other side of the connecting plate 11 and is used to connect to the testing machine, so as to facilitate the connection between the test piece 2 and the testing machine.
[0046] In this example, the connecting plate 11 has a positioning groove on one side of the test piece 2, which facilitates the initial positioning of the test piece 2.
[0047] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6As shown, in some optional embodiments, the clamping mechanism 3 includes four clamping plates 31, the connecting plate 11 has a cross-shaped cross section, the connecting plate 11 includes a central rectangular portion and four extension portions, the central rectangular portion is used to connect the test piece 2, the extension portions correspond one-to-one with the clamping plates 31, the extension portions are provided with at least one T-shaped sliding hole 111, and the clamping plates 31 are provided with T-shaped sliders 311 corresponding to the T-shaped sliding holes 111.
[0048] In this embodiment, the clamping mechanism 3 includes four clamping plates 31. The connecting plate 11 has a cross-shaped cross section. The connecting plate 11 includes a central rectangular portion and four extension portions. The central rectangular portion is used to connect the test piece 2. The extension portions correspond one-to-one with the clamping plates 31. The extension portions are provided with at least one T-shaped sliding hole 111. The clamping plate 31 is provided with a T-shaped slider 311 corresponding to the T-shaped sliding hole 111. The T-shaped slider 311 is slidably disposed in the T-shaped sliding hole 111, which facilitates the clamping plate 31 to move relative to the connecting mechanism 1 in a direction close to or away from the test piece 2, which facilitates the clamping process and simplifies the assembly process.
[0049] In this example, the four extensions are respectively located on the four sides of the central rectangular part, and are also rectangular in shape. Each extension is provided with two spaced T-shaped sliding holes 111.
[0050] like Figure 1 , Figure 2 and Figure 3 As shown, in some optional embodiments, the clamping assembly 32 includes two sets of clamping units arranged in a cross configuration. Each clamping unit includes at least one U-shaped clamp 4 that abuts against the clamping plate 31 to press the two opposing clamping plates 31 onto the test piece 2.
[0051] In this embodiment, the structure of the clamping assembly 32 is specifically described. The clamping assembly 32 includes two sets of clamping units arranged in a cross manner. Each clamping unit includes at least one U-shaped clamp 4. The U-shaped clamp 4 abuts against the clamping plate 31 and is used to press the two opposing clamping plates 31 onto the test piece 2. The structure is simple and easy to manufacture.
[0052] In this example, the two clamping units are arranged in a cross shape.
[0053] like Figure 3 and Figure 7 As shown, in some optional embodiments, the U-shaped clamp 4 includes:
[0054] U-shaped steel plate 41, one inner side of which is used to abut against clamping plate 31 on one side of test piece 2;
[0055] The clamping assembly 42 is disposed on the other side wall of the U-shaped steel plate 41 and is movable relative to the side wall of the U-shaped steel plate 41 to abut against the clamping plate 31 on the other side of the test piece 2.
[0056] In this embodiment, the specific structure of the U-shaped clamp 4 is described. The U-shaped clamp 4 includes a U-shaped steel plate 41 and a clamping assembly 42. The inner side of one side wall of the U-shaped steel plate 41 is used to abut against the clamping plate 31 on one side of the test piece 2. The clamping assembly 42 is disposed on the other side wall of the U-shaped steel plate 41 and can move relative to the side wall of the U-shaped steel plate 41 to abut against the clamping plate 31 on the other side of the test piece 2, thereby clamping the test piece 2.
[0057] like Figure 7 As shown, in some optional embodiments, the clamping assembly 42 includes:
[0058] Pressure plate 421 is located inside the side wall of U-shaped steel plate 41 and is used to abut against the corresponding clamping plate 31;
[0059] Adjusting rod 422, which is connected to pressure plate 421 and threaded to the side wall of U-shaped steel plate 41, is used to adjust the clamping force of pressure plate 421 on test piece 2 by rotating it.
[0060] In this embodiment, the specific structure of the clamping assembly 42 is described. The clamping assembly 42 includes a pressure plate 421 and an adjusting rod 422. The pressure plate 421 is located inside the side wall of the U-shaped steel plate 41 and is used to abut against the corresponding clamping plate 31. The adjusting rod 422 is connected to the pressure plate 421 and is threadedly connected to the side wall of the U-shaped steel plate 41 so that the clamping force of the pressure plate 421 on the test piece 2 can be adjusted by rotating it. The clamping force can be quickly adjusted, which facilitates the installation and disassembly process.
[0061] In this example, the end of the adjusting rod 422 away from the pressure plate 421 is provided with a guard 423.
[0062] like Figure 7 As shown, in some optional embodiments, a rubber sheet 43 is provided on the inner side of one side wall of the U-shaped steel plate 41, and the rubber sheet 43 is used to abut against the clamping plate 31 on one side of the test piece 2.
[0063] In this embodiment, a rubber sheet 43 is provided on the inner side of one side wall of the U-shaped steel plate 41. The rubber sheet 43 is used to hold the clamping plate 31 on one side of the test piece 2, so that the holding force on one side of the test piece 2 can be provided through one side wall of the U-shaped steel plate 41.
[0064] like Figure 4 and Figure 5 As shown, in some optional embodiments, a U-shaped connecting platform 112 is provided on the other side of the connecting plate 11. The groove shape at the opening of the U-shaped connecting platform 112 is T-shaped, and the end shape of the clamping rod 12 matches the shape of the groove.
[0065] In this embodiment, a U-shaped connecting platform 112 is provided on the other side of the connecting plate 11. The groove at the opening of the U-shaped connecting platform 112 is T-shaped, and the end shape of the clamping rod 12 matches the shape of the groove, so that the end of the clamping rod 12 can be slid into the U-shaped connecting platform 112 from one side for easy connection.
[0066] In this example, the length of the groove at the opening of the U-shaped connecting platform 112 is greater than the diameter of the clamping rod 12, which improves the adaptability of use and facilitates the geometric alignment of the test piece 2 during installation.
[0067] like Figure 3 As shown, in some optional embodiments, the clamping unit perpendicular to the slide groove direction includes two U-shaped clamps 4, which are spaced apart along the slide groove direction and located on both sides of the clamping rod 12 to limit the position of the clamping rod 12 within the slide groove.
[0068] In this embodiment, the clamping unit perpendicular to the slide groove direction includes two U-shaped clamps 4. The two U-shaped clamps 4 are spaced apart along the slide groove direction and located on both sides of the clamping rod 12 to limit the position of the clamping rod 12 in the slide groove, thereby improving the stability of the device used for pre-tightened UHPC-NC interlayer pull-out test.
[0069] In some alternative embodiments, the clamping plate 31 has the same thickness as the T-shaped slider 311 and is less than the length of the T-shaped sliding hole 111.
[0070] In this embodiment, the clamping plate 31 and the T-shaped slider 311 have the same thickness and are smaller than the length of the T-shaped sliding hole 111, which improves the applicability of the device for pre-tightened UHPC-NC interlayer pull-out test. The T-shaped slider 311 can slide in the T-shaped sliding hole 111, and the position of the T-shaped slider 311 in the T-shaped sliding hole 111 can be adjusted according to the actual size of the test piece 2.
[0071] In summary, when using the apparatus for pre-tensioned UHPC-NC interlaminar pull-out tests, one end of the connecting mechanism 1 is connected to the testing machine, and the test specimen 2 is attached to the other end of the connecting mechanism 1. The clamping plate 31 is arranged circumferentially along the test specimen 2 and is movably connected to the connecting mechanism 1, meaning the clamping plate 31 can move relative to the connecting mechanism 1 in a direction closer to or further away from the test specimen 2. The clamping assembly 32 abuts against the outside of the clamping plate 31 to press the clamping plate 31 onto the test specimen 2, thereby fixing the test specimen 2. Because the clamping plate 31 is movably connected to the connecting mechanism 1, and the clamping assembly 32 abuts against the outside of the clamping plate 31 to press the clamping plate 31 onto the test specimen 2, thereby fixing the test specimen 2, the clamping process is more convenient and has higher stability. It eliminates the need for adhesive bonding, solving the problem in existing technologies where the adhesive bonding strength is relatively weak, potentially leading to premature failure of the steel plate-concrete interface during the test, resulting in test results that cannot accurately reflect the true bond strength of the concrete interface and making it difficult to obtain actual experimental results.
[0072] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.
[0073] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.
[0074] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.
Claims
1. A device for pre-stressed UHPC-NC interlaminar pull-out test, characterized in that, The utility model relates to a connecting mechanism for testing machine, including: Two interval arrangement clamping units, the clamping unit includes: Connecting mechanism (1), one end is used for connecting with testing machine, the other end is used for being attached on test piece (2); Clamping mechanism (3), it includes clamping plate (31) and clamping assembly (32), the clamping plate (31) is arranged along the circumference of test piece (2) and is movably connected with connecting mechanism (1), the clamping assembly (32) is opposite on the outside of clamping plate (31), is used for pressing clamping plate (31) on test piece (2), to fix test piece (2).
2. A device for pre-stressed UHPC-NC interlaminar pull-out test according to claim 1, characterized in that, The connecting mechanism (1) includes: Connecting plate (11), one side is used for being attached on test piece (2), the connecting plate (11) is movably connected with clamping plate (31); Clamping rod (12) is arranged on the other side of connecting plate (11) and is used for connecting with testing machine.
3. A device for pre-stressed UHPC-NC interlaminar pull-out test according to claim 2, characterized in that, The clamping mechanism (3) includes four clamping plates (31), the cross section shape of connecting plate (11) is cross, the connecting plate (11) includes middle rectangular part and four extension parts, the middle rectangular part is used for connecting test piece (2), the extension part corresponds with clamping plate (31) one by one, at least one T type sliding hole (111) is arranged on the extension part, T type sliding block (311) corresponding with T type sliding hole (111) is arranged on clamping plate (31).
4. A device for pre-stressed UHPC-NC interlaminar pull-out test according to claim 3, characterized in that, The clamping assembly (32) includes two groups of cross arrangement clamping units, the clamping unit includes at least one U type clamp (4), the U type clamp (4) is opposite with clamping plate (31), is used for pressing the two clamping plates (31) opposite arrangement on test piece (2).
5. A device for pre-stressed UHPC-NC interlaminar pull-out test according to claim 4, characterized in that, The U type clamp (4) includes: U type steel plate (41), one side wall inner side is used for being opposite on the clamping plate (31) of test piece (2) one side; Pressing assembly (42) is arranged on the other side wall of U type steel plate (41) and can move relative to the side wall of U type steel plate (41) to be opposite on the clamping plate (31) of test piece (2) other side.
6. A device for pre-stressed UHPC-NC interlaminar pull-out test according to claim 5, characterized in that, The pressing assembly (42) includes: Pressing disc (421), which is located in the inner side of the side wall of the U-shaped steel plate (41), and is used for being opposite on the corresponding clamping plate (31); Adjusting rod (422) is connected with the pressing disc (421) and is screw connected with the side wall of the U-shaped steel plate (41), so as to adjust the pressing force of the pressing disc (421) on the test piece (2) by rotating.
7. A device for pre-stressed UHPC-NC interlaminar pull-out test according to claim 5, characterized in that, One side wall inner side of the U-shaped steel plate (41) is provided with a rubber sheet (43), and the rubber sheet (43) is used for being opposite on the clamping plate (31) of test piece (2) one side.
8. A device for pre-stressed UHPC-NC interlaminar pull-out test according to claim 4, characterized in that, The other side of the connecting plate (11) is provided with a U-shaped connecting table (112), and the sliding groove shape of the opening of the U-shaped connecting table (112) is T-shaped, and the end shape of the clamping rod (12) matches the sliding groove shape.
9. A device for pre-stressed UHPC-NC interlaminar pull-out test according to claim 8, characterized in that, The clamping unit perpendicular to the direction of the chute comprises two U-shaped clamps (4), which are arranged at intervals along the direction of the chute and located on both sides of the clamping rod (12) to limit the position of the clamping rod (12) in the chute.
10. A device for pre-stressed UHPC-NC interlaminar pull-out test according to claim 3, characterized in that, The thickness of the clamping plate (31) is the same as that of the T-shaped sliding block (311) and smaller than the length of the T-shaped sliding hole (111).