Drawing device for measuring bonding slippage performance of reinforced concrete interface

Abstract

The embodiment of the invention provides a drawing device for measuring the bonding slippage performance of a reinforced concrete interface. The drawing device comprises a rack, a concrete fixing mechanism, a reinforcing steel bar fixing mechanism and a driving mechanism. The driving mechanism is used for driving the concrete fixing mechanism to lift. The steel bar fixing mechanism comprises a fixing column and a fixing bolt. A first hole penetrating in the vertical direction is formed in the fixing column, and a plurality of second holes evenly distributed in the circumferential direction are further formed in the outer wall of the fixing column. The multiple fixing bolts can be inserted into the first holes from the corresponding second holes, and the fixing bolts are in threaded connection with the second holes. According to the invention, the concrete main body of the concrete drawing test piece is fixed by the concrete fixing mechanism, the reinforcing steel bar vertically penetrates through the first hole in the fixing column, the plurality of fixing bolts are rotated, and the bolts are fed in the second hole and then abut against the reinforcing steel bar, so that the fixing of the reinforcing steel bar is realized. After the pull-out test is finished, the steel bar can be separated from the fixing column by unscrewing the fixing bolt, the steel bar can be taken out easily, and deformation of the steel bar fixing mechanism cannot be caused.

Description

Technical Field

[0001] The invention relates to the technical field of test equipment, and in particular to a pulling device for measuring the bond-slip performance of a reinforced concrete interface. Background Art

[0002] In order to measure the bond-slip performance of reinforced concrete sections, a pull-out test is required. The concrete pull-out specimen consists of a concrete body and steel bars that penetrate the concrete body. Before conducting a concrete pull-out test, the lower end of the steel bar needs to be connected to the lower end fixture of the pull-out test machine, and then the concrete body needs to be pulled upward.

[0003] In practice, it is found that the lower end of the steel bar is clamped by the clamp. After the concrete pull-out test, the clamp is tightly combined with the steel bar and cannot be easily removed. The clamp and the steel bar need to be knocked, which is time-consuming and labor-intensive, and can easily cause the clamp to deform, resulting in a weakened fixing effect of the clamp. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a pulling device for measuring the bond-slip performance of reinforced concrete interfaces, thereby solving or at least alleviating one or more of the above-mentioned problems and other problems in the prior art.

[0005] The present invention provides a pulling device for measuring the bond-slip performance of a reinforced concrete interface, comprising:

[0006] frame:

[0007] A concrete fixing mechanism, which is arranged on the frame and can move up and down, and is used to fix the concrete body;

[0008] A steel bar fixing mechanism, arranged on the frame and used for fixing the steel bars; and

[0009] A driving mechanism, used for driving the concrete fixing mechanism to rise and fall;

[0010] The steel bar fixing mechanism comprises:

[0011] A fixing column, on which a first hole is formed vertically, and on an outer wall of which a plurality of second holes are formed evenly distributed in a circumferential direction; and

[0012] A plurality of fixing bolts are provided, which can be inserted into the first holes from the corresponding second holes, and the fixing bolts are threadedly connected with the second holes;

[0013] The fixing column can be connected to the frame, and the first hole is used for placing steel bars.

[0014] Preferably, the concrete fixing mechanism comprises:

[0015] a bearing plate, which is vertically movably arranged on the frame, and is provided with a third hole penetrating vertically, and is used to bear the concrete body; and

[0016] A detection mechanism, arranged on the bearing platform, for detecting the verticality between the steel bar and the bearing plate;

[0017] The driving mechanism is used to drive the carrying plate to move up and down.

[0018] Preferably, the detection mechanism comprises:

[0019] A guide assembly, provided in two groups, arranged on the support plate;

[0020] Two groups of positioning components are provided, which are vertically slidably arranged on the corresponding guide components and can remain motionless on the guide components; and

[0021] Two infrared laser generators are provided and are installed on the positioning components respectively;

[0022] The two planes formed by the light rays emitted by the two infrared generators when the two infrared generators move are perpendicular to each other, and the intersection line of the two planes coincides with the center line of the third hole.

[0023] Preferably, the guide assembly comprises two guide rods; the guide rods are arranged vertically; the two guide rods are parallel to each other; a guide groove is respectively provided on a surface of the two guide rods facing each other; and the two ends of the positioning assembly are respectively slidably matched with the two guide grooves.

[0024] Preferably, the positioning component comprises:

[0025] The positioning seat is arranged between the two guide rods, and the outer walls on both sides thereof are respectively matched with the corresponding guide rods in vertical sliding manner;

[0026] A pressing rod, the lower end of which is vertically slidably disposed in the positioning seat, and a horizontally penetrating window is provided on the pressing rod;

[0027] A square sleeve, one end of which is closed and the other end is open, wherein the open end of the direction sleeve is slidably disposed in the positioning seat and passes through the clearance window;

[0028] A square rod, one end of which is slidably disposed in the positioning seat and slidably inserted into the square sleeve;

[0029] A spring, located in the direction sleeve, with one end connected to the closed end of the direction sleeve and the other end connected to the end of the square rod;

[0030] A first magnet block is connected to the closed end of the square sleeve, is gap-matched with the corresponding guide groove, and is magnetically attracted to the bottom of the guide groove;

[0031] A second magnet block is connected to one end of the square rod away from the square sleeve, is gap-matched with the corresponding guide groove, and is magnetically attracted to the bottom of the guide groove; and

[0032] A connecting rope, one end of which is connected to an end of the square rod away from the square sleeve, the other end of which is connected to the closed end of the square sleeve, and the middle part of which is connected to the lower end of the pressing rod.

[0033] Preferably, the concrete fixing mechanism further comprises:

[0034] A top plate, on which a fourth hole is formed that passes through in a vertical direction;

[0035] A plurality of connecting beams, two ends of which are respectively connected to the lower end of the top plate and the upper end of the bearing plate;

[0036] a threaded connecting rod, threadedly connected to the fourth hole; and

[0037] An upper connecting seat, which is threadedly connected to the threaded connecting rod through an opening, and is rotatably arranged on the frame, and the upper connecting seat can move vertically;

[0038] The driving mechanism is used to drive the upper connecting seat to rise and fall.

[0039] Preferably, the steel bar fixing mechanism further comprises:

[0040] A threaded butt column, the upper end of which is concentrically connected to the fixing column; and

[0041] The lower connecting seat is connected to the frame and is threadedly connected to the lower end of the threaded connecting column through an opening.

[0042] Compared with the prior art, the present invention has the following beneficial effects:

[0043] In the technology of the present invention, the concrete body of the concrete pull-out test piece is fixed by a concrete fixing mechanism, and the steel bar is vertically passed through the first hole on the fixing column, and the bolts are rotated through a plurality of fixing bolts, and the bolts are fed into the second hole and abut against the steel bar to fix the steel bar. After the pull-out test is completed, the steel bar can be separated from the fixing column by loosening the fixing bolts, and the steel bar can be removed easily without causing deformation of the steel bar fixing mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the description of the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0045] Figure 1 A three-dimensional diagram of a pulling device for measuring the bond-slip performance of a reinforced concrete interface in one embodiment of the present invention;

[0046] Figure 2 for Figure 1 Another stereogram of

[0047] Figure 3 for Figure 1 Another stereogram of (without top plate);

[0048] Figure 4 for Figure 1 A three-dimensional diagram of the middle steel bar fixing mechanism;

[0049] Figure 5 for Figure 3 A three-dimensional diagram of the inspection mechanism;

[0050] Figure 6 for Figure 5 A perspective view of the positioning assembly;

[0051] Figure 7 for Figure 6 Partial exploded view;

[0052] Figure 8 for Figure 6 Schematic diagram of the internal structure.

[0053] Reference numerals:

[0054] 10. Concrete fixing mechanism; 11. Load-bearing plate; 111. Third hole; 12. Detection mechanism; 13. Guide assembly; 131. Guide rod; 132. Guide groove; 14. Positioning assembly; 141. Positioning seat; 142. Pressing rod; 143. Square sleeve; 144. Square rod; 145. Spring; 146. First magnet block; 147. Second magnet block; 148. Connecting rope; 15. Infrared laser generator; 15. Top plate; 151. Fourth hole; 16. Connecting beam; 17. Threaded connecting rod; 18. Upper connecting seat;

[0055] 20. Steel bar fixing mechanism; 21. Fixing column; 211. First hole; 212. Second hole; 22. Fixing bolt; 23. Threaded butt column; 24. Lower connecting seat;

[0056] 30. Concrete body; 31. Steel bars. DETAILED DESCRIPTION

[0057] The following embodiments of the technical solution of the present invention are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and cannot be used to limit the protection scope of the present invention.

[0058] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by those skilled in the art to which the present invention belongs.

[0059] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0060] In addition, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present invention, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0061] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0062] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0063] See also Figures 1 to 8 This embodiment provides a pulling device for measuring the bond slip performance of the reinforced concrete interface, including a frame (not shown), a concrete fixing mechanism 10, a steel bar fixing mechanism 20 and a driving mechanism (not shown).

[0064] In the concrete pull-out test, the concrete body 30 is a rectangular parallelepiped, and the steel bar 31 passes through the center of the concrete body 30 .

[0065] The concrete fixing mechanism 10 is arranged on the frame, and the concrete fixing mechanism 10 can move up and down, and the concrete fixing mechanism 10 is used to fix the concrete body 30. The steel bar 31 fixing mechanism is arranged on the frame, and the steel bar fixing mechanism 20 is used to fix the steel bar 31. The driving mechanism is used to drive the concrete fixing mechanism 10 to rise and fall. The frame and the driving mechanism can be set with reference to the tensile testing machine in the prior art, and will not be described in detail here.

[0066] The steel bar fixing mechanism 20 includes a fixing column 21 and a fixing bolt 22 .

[0067] The fixing column 21 is provided with a first hole 211 that penetrates vertically, and the outer wall of the fixing column 21 is also provided with a plurality of second holes 212 that are evenly distributed in the circumferential direction. A plurality of fixing bolts 22 are provided, and the fixing bolts 22 can be inserted into the first holes 211 from the corresponding second holes 212, and the fixing bolts 22 are threadedly connected with the second holes 212. The fixing column 21 can be connected to the frame, and the first holes 211 are used to place the steel bars 31.

[0068] In this embodiment, the concrete body 30 of the concrete pull-out specimen is fixed by the concrete fixing mechanism 10, and the steel bar 31 vertically passes through the first hole 211 on the fixing column 21, and is rotated by a plurality of fixing bolts 22. The bolts are fed into the second hole 212 and then abut against the steel bar 31, thereby fixing the steel bar 31. Then the driving mechanism drives the concrete fixing mechanism 10 to rise and perform the pull-out test. After the pull-out test is completed, the steel bar 31 can be separated from the fixing column 21 by loosening the fixing bolts 22, and it is relatively easy to take out the steel bar 31. It will not cause the steel bar fixing mechanism 20 to deform. Since the steel bar 31 is fixed by rotating and feeding a plurality of fixing bolts 22, steel bars 31 of multiple sizes can be adapted. In addition, the outer wall of the steel bar 31 can be polished to make the fixing of the steel bar 31 by the end of the fixing bolt 22 more stable.

[0069] In one embodiment, the concrete fixing mechanism 10 includes a bearing plate 11 and a detection mechanism 12 .

[0070] The bearing plate 11 is vertically movable and arranged on the frame, and a third hole 111 is provided thereon and passes through in the vertical direction. The bearing plate 11 is used to bear the concrete body 30. The detection mechanism 12 is arranged on the bearing platform, and the detection mechanism 12 is used to detect the verticality between the steel bar 31 and the bearing plate 11. The driving mechanism is used to drive the bearing plate 11 to rise and fall.

[0071] In this embodiment, the concrete body 30 is in a rectangular parallelepiped shape and is vertically placed on the bearing plate 11 . The steel bars 31 passing through the concrete body 30 are fixed by the steel bar fixing mechanism 20 after passing through the third hole 111 .

[0072] The steel bars 31 of the central pull-out specimen are easily pressed into position displacement by the concrete during pouring, resulting in a large error in the pull-out test. The detection mechanism 12 can detect the verticality between the steel bars 31 and the bearing plate 11, thereby detecting whether the steel bars 31 are offset in the concrete body 30, thereby avoiding useless pull-out tests.

[0073] In one embodiment, the detection mechanism 12 includes a guide component 13 , a positioning component 14 and an infrared laser generator 15 .

[0074] There are two groups of guide components 13, which are arranged on the support plate. There are two groups of positioning components 14, which are arranged on the corresponding guide components 13 along the vertical sliding direction, and the positioning components 14 can remain motionless on the guide components 13. There are two infrared laser generators 15, which are installed on the positioning components 14 accordingly. The two planes formed by the light emitted by the two infrared generators when the two infrared generators move are perpendicular to each other, and the intersection of the two planes coincides with the center line of the third hole 111. The infrared laser generator 15 is used to generate infrared lasers, and the existing technology can be used. In addition, the infrared laser generator 15 in the detection mechanism 12 can also be carried by a rod, and the rod has the same moving trajectory as the infrared light emitted by the infrared generator, and plays the same role as the infrared light emitted by the infrared laser generator 15. The advantage of using the infrared laser generator 15 is that, compared with the setting of the rod, it will not cause interference when the concrete pull-out specimen is placed, will not bring obstacles, and is more convenient to use. In addition, the infrared laser generator 15 can also be replaced by other light sources.

[0075] In this embodiment, the two positioning components 14 can slide vertically on the guide component 13 and can remain motionless. The two infrared laser generators 15 installed on the two positioning components 14 respectively irradiate infrared rays on the steel bars 31 extending from the upper end of the concrete body 30 in the process of following the positioning components 14 to move up and down. When the two infrared rays irradiate the middle of the steel bars 31, and as the infrared laser generator 15 moves vertically, the infrared rays are always in the middle of the steel bars 31, it means that the steel bars 31 in the concrete body 30 are not deflected, and can be used as specimens for concrete pull-out tests, thereby improving the accuracy of subsequent test results.

[0076] In one embodiment, the guide assembly 13 includes two guide rods 131; the guide rods 131 are arranged vertically; the two guide rods 131 are parallel to each other; a guide groove 132 is respectively provided on the opposite sides of the two guide rods 131; and the two ends of the positioning assembly 14 are respectively slidably matched with the two guide grooves 132.

[0077] In one embodiment, the positioning assembly 14 includes a positioning seat 141 , a pressing rod 142 , a square sleeve 143 , a square rod 144 , a spring 145 , a first magnet block 146 , a second magnet block 147 and a connecting rope 148 .

[0078] The positioning seat 141 is arranged between the two guide rods 131, and the outer walls on both sides thereof are respectively matched with the corresponding guide rods 131 along the vertical sliding direction. The infrared laser generator 15 is connected to the inner side of the positioning seat 141. The lower end of the pressing rod 142 is vertically slidably arranged in the positioning seat 141, and a horizontally penetrating window is provided on it. One end of the square sleeve 143 is closed, and the other end of the square sleeve 143 is open. The open end of the direction sleeve is slidably arranged in the positioning seat 141 and passes through the window. One end of the square rod 144 is slidably arranged in the positioning seat 141 and is slidably inserted into the square sleeve 143. The spring 145 is located in the direction sleeve, one end of the spring 145 is connected to the closed end of the direction sleeve, and the other end of the spring 145 is connected to the end of the square rod 144. Specifically, the positioning seat 141 is provided with a vertical hole along the vertical direction and a horizontal hole along the horizontal direction, the vertical hole and the horizontal hole are arranged in a cross shape, the pressing rod 142 is slidably matched with the vertical hole, and the square sleeve 143 and the square rod 144 are slidably matched with the horizontal hole.

[0079] The first magnet block 146 is connected to the closed end of the square sleeve 143, and the first magnet block 146 is gap-matched with the corresponding guide groove 132, and the first magnet block 146 is magnetically attracted to the bottom of the guide groove 132. The second magnet block 147 is connected to the end of the square rod 144 away from the square sleeve 143, and the second magnet block 147 is gap-matched with the corresponding guide groove 132, and the second magnet block 147 is magnetically attracted to the bottom of the guide groove 132. Specifically, the bottom of the guide groove 132 is made of iron or magnet, so that the first magnet block 146 and the second magnet block 147 can be magnetically attracted to the bottom of the guide groove 132.

[0080] One end of the connecting rope 148 is connected to one end of the square rod 144 away from the square sleeve 143, the other end of the connecting rope 148 is connected to the closed end of the square sleeve 143, and the middle part of the connecting rope 148 is connected to the lower end of the pressing rod 142. Specifically, the lower end of the pressing rod 142 passes through the vertical hole and is suspended and connected to the connecting rope 148.

[0081] In this embodiment, without applying external force, the spring 145 applies elastic force in the square sleeve 143, so that the square rod 144 slides out of the square sleeve 143, so that the first magnet block 146 and the second magnet block 147 on both sides respectively abut against the bottom of the guide grooves 132 on both sides, and the bottom of the guide groove 132 and the first magnet block 146 / the second magnet block 147 are magnetically attracted to each other, so that the entire positioning seat 141 remains motionless between the two guide rods 131 there. At this time, the infrared light emitted by the infrared laser generator 15 irradiates the steel bar 31, and it can be carefully observed whether the infrared light irradiates the center of the steel bar 31.

[0082] When the positioning seat 141 needs to be moved, the pressing rod 142 can be pressed, and the pressing rod 142 moves downward to drive the connecting rope 148 to move downward, and the connecting rope 148 drives the square sleeve 143 and the square rod 144 to approach each other, compressing the spring 145, and the first magnet block 146 and the second magnet block 147 on both sides are separated from the bottom of the guide groove 132, but the first magnet block 146 and the second magnet block 147 are always located in the guide groove 132, thereby ensuring that the positioning seat 141 can slide vertically between the two guide rods 131 without being separated. Until the positioning seat 141 slides into place, the pressing rod 142 is released, and the first magnet block 146 and the second magnet block 147 on both sides can be magnetically attracted to the bottom of the corresponding guide groove 132 to achieve fixation.

[0083] In one embodiment, the concrete fixing mechanism 10 further includes a top plate 15 , a plurality of connecting beams 16 and an upper connecting seat 18 .

[0084] A fourth hole 151 is provided on the top plate 15 and passes through in the vertical direction. The two ends of the connecting beam 16 are respectively connected to the lower end of the top plate 15 and the upper end of the bearing plate 11. Four connecting beams 16 can be provided, and the top plate 15 and the receiving plate are both square. The four connecting beams 16 are respectively located at the four corners of the top plate 15 and the receiving plate. Each guide assembly 13 is located between two connecting beams 16. The threaded connecting rod 17 is threadedly connected to the fourth hole 151. The middle part of the threaded connecting rod 17 is a hexagonal prism. The upper connecting seat 18 is threadedly connected to the threaded connecting rod 17 through an opening, and the upper connecting seat 18 is rotatably arranged on the frame, and the upper connecting seat 18 can move vertically. The driving mechanism is used to drive the upper connecting seat 18 to rise and fall. Specifically, the upper connecting seat 18 can be cylindrical, and its outer ring is connected to a bearing, and the bearing can move vertically on the frame, and the driving mechanism can drive the bearing to rise and fall.

[0085] In this embodiment, the overall weight of the concrete tensile specimen is relatively heavy. Usually, the concrete fixing mechanism 10 is removed from the frame and moved to a suitable position for placement, and then the concrete specimen is loaded onto the bearing plate 11 through an apparatus, and then the entire concrete fixing mechanism 10 is moved to the frame. At this time, the threaded connecting rod 17 is screwed out from the fourth hole 151 of the top plate 15 and continues to rotate, and then the threaded connecting rod 17 is threadedly connected to the through hole of the upper connecting seat 18.

[0086] In one embodiment, the steel bar fixing mechanism 20 further includes a threaded connection column 23 and a lower connection seat 24 .

[0087] The upper end of the threaded connection column 23 is connected to the fixed column 21 concentrically. The lower connection seat 24 is connected to the frame, and the lower connection seat 24 is threadedly connected to the lower end of the threaded connection column through an opening.

[0088] In this embodiment, during installation, after the steel bar fixing mechanism 20 is connected to the lower end of the steel bar 31, the height of the bearing plate 11 can be adjusted by rotating the threaded connecting rod 17, so that the threaded connecting column 23 is inserted into the hole of the lower connecting seat 24 after being lowered, and as the entire concrete fixing mechanism 10 is further rotated, the threaded connecting column 23 is threadedly connected with the lower connecting seat 24. Then the driving mechanism drives the threaded connecting column to rise, the bearing plate 11 rises, thereby driving the concrete body 30 to rise, and the steel bar 31 together with the steel bar fixing mechanism 20 and the lower connecting seat 24 remain stationary, completing the concrete pull-out test. After the test is completed, the fixing bolts 22 are loosened, and the entire device can be dismantled again, which is relatively labor-saving.

[0089] In the description of the present invention, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0090] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. A pulling device for measuring the bond slip performance of reinforced concrete interface, characterized in that: include: frame: A concrete fixing mechanism (10), which is arranged on the frame and can move up and down, and is used to fix the concrete body (30); A steel bar fixing mechanism (20), arranged on the frame and used for fixing the steel bars (31); as well as A driving mechanism, used for driving the concrete fixing mechanism (10) to rise and fall; The steel bar (31) fixing mechanism comprises: A fixing column (21) having a first hole (211) extending vertically therethrough and a plurality of second holes (212) evenly distributed in the circumferential direction formed on the outer wall thereof; and A plurality of fixing bolts (22) are provided, and can be inserted into the first hole (211) from the corresponding second hole (212), and the fixing bolts (22) are threadedly connected to the second hole (212); The fixing column (21) can be connected to the frame, and the first hole (211) is used to place the steel bar (31).

2. A pulling device for measuring the bond-slip performance of reinforced concrete interface according to claim 1, characterized in that: The concrete fixing mechanism (10) comprises: A bearing plate (11) is vertically movably arranged on the frame, and is provided with a third hole (111) penetrating vertically, wherein the bearing plate (11) is used to bear the concrete body (30); and A detection mechanism (12) is arranged on the bearing platform and is used to detect the verticality between the steel bar (31) and the bearing plate (11); The driving mechanism is used for driving the carrying plate (11) to rise and fall.

3. A pulling device for measuring the bond-slip performance of reinforced concrete interface as claimed in claim 2, characterized in that: The detection mechanism (12) comprises: A guide assembly (13), which is provided in two groups and is arranged on the support plate; The positioning components (14) are provided in two groups and are vertically slidably arranged on the corresponding guide components (13) and can remain stationary on the guide components (13); and Two infrared laser generators (15) are provided and are mounted on the positioning components (14) respectively; The two planes formed by the light emitted by the two infrared generators when the two infrared generators move are perpendicular to each other, and the intersection line of the two planes coincides with the center line of the third hole (111).

4. A pulling device for measuring the bond-slip performance of reinforced concrete interface as claimed in claim 3, characterized in that: The guide assembly (13) comprises two guide rods (131); the guide rods (131) are arranged vertically; the two guide rods (131) are parallel to each other; a guide groove (132) is respectively formed on a surface of the two guide rods (131) facing each other; and the two ends of the positioning assembly (14) are respectively slidably matched with the two guide grooves (132).

5. A pulling device for measuring the bond-slip performance of reinforced concrete interface as claimed in claim 4, characterized in that: The positioning assembly (14) comprises: The positioning seat (141) is arranged between the two guide rods (131), and the outer walls on both sides thereof are respectively slidably matched with the corresponding guide rods (131) in the vertical direction; A pressing rod (142), the lower end of which is vertically slidably disposed in the positioning seat (141), and a horizontally penetrating window is provided on the pressing rod; A square sleeve (143) with one end closed and the other end open, the open end of the direction sleeve being slidably disposed in the positioning seat (141) and passing through the clearance window; A square rod (144), one end of which is slidably disposed in the positioning seat (141) and slidably inserted into the square sleeve (143); A spring (145) is located in the direction sleeve, one end of which is connected to the closed end of the direction sleeve, and the other end of which is connected to the end of the square rod (144); A first magnet block (146) is connected to the closed end of the square sleeve (143), is clearance-matched with the corresponding guide groove (132), and is magnetically attracted to the bottom of the guide groove (132); A second magnet block (147) is connected to one end of the square rod (144) away from the square sleeve (143), is clearance-matched with the corresponding guide groove (132), and is magnetically attracted to the bottom of the guide groove (132); and A connecting rope (148) has one end connected to one end of the square rod (144) away from the square sleeve (143), the other end connected to the closed end of the square sleeve (143), and the middle part connected to the lower end of the pressing rod (142).

6. A pulling device for measuring the bond-slip performance of reinforced concrete interface according to any one of claims 2 to 5, characterized in that: The concrete fixing mechanism (10) further comprises: A top plate (15) having a fourth hole (151) extending vertically therethrough; A plurality of connecting beams (16), wherein two ends of the connecting beams (16) are respectively connected to the lower end of the top plate (15) and the upper end of the bearing plate (11); a threaded connecting rod (17) threadedly connected to the fourth hole (151); and An upper connecting seat (18) is threadedly connected to the threaded connecting rod (17) through an opening, and is rotatably arranged on the frame. The upper connecting seat (18) can move vertically; The driving mechanism is used to drive the upper connecting seat (18) to rise and fall.

7. A pulling device for measuring the bond-slip performance of reinforced concrete interface as claimed in claim 6, characterized in that: The steel bar (31) fixing mechanism further comprises: A threaded butt joint column (23), the upper end of which is co-centrically connected to the fixing column (21); and The lower connecting seat (24) is connected to the frame and is threadedly connected to the lower end of the threaded connecting column through an opening.

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