CN114166660B - Anchor bolt shearing test device for concrete - Google Patents

Abstract

The present invention relates to the technical field of concrete anchor bolts, and discloses a shear test device for concrete anchor bolts, comprising a test box, wherein an inner cavity is formed at the upper part of the interior of the test box, a vertical groove is formed at the middle part of the inner top wall of the inner cavity, an anchor bolt is movably arranged inside the vertical groove, and the anchor bolt is vertically arranged inside the inner cavity; a driving cavity is formed at the lower part of the interior of the test box, and two frame grooves are respectively provided between the driving cavity and the inner cavity, one on the left and the other on the right; turning a first knob can rotate a first screw rod, and the rotation of the first screw rod drives a first shear block threadedly connected to its outer wall to move up and down, and turning a second knob can rotate a second screw rod, and the rotation of the second screw rod drives a second shear block threadedly connected to its outer wall to move up and down, thereby facilitating adjustment of the positions of the first shear block and the second shear block, and facilitating shear tests on different positions of the anchor bolts or shear tests on the anchor bolts at different distances.

Description

A concrete anchor shear test device

Technical Field

The invention relates to the technical field of concrete anchor bolts, in particular to a shear test device for concrete anchor bolts.

Background Art

With the development of science and the advancement of technology, reinforced concrete structures have been widely used. Reinforced concrete structures will show different degrees of cracking and damage during long-term use. In order to ensure the quality and safety of construction projects, relevant personnel are required to strengthen the reinforcement of concrete structures during specific construction. In building reinforcement projects, a variety of reinforcement parts are often used, including a wide variety of anchor bolts.

In order to ensure the reinforcement effect, the anchor bolts installed in the concrete need to undergo multiple performance tests such as tension and shear to reflect the tensile and shear resistance of the anchor bolts; for example, the Chinese patent announcement number is: CN213875292U, which provides a concrete anchor bolt shear test device, including a concrete block, characterized in that: the concrete block is located between a base and a plurality of cover plates, and the cover plates and the base are movably connected by a plurality of vertically arranged screw rods; an anchor bolt is anchored on the concrete block, and the anchor bolt is located in the sleeve hole of the shear sleeve; the shear sleeve is connected to the tensile clamp. This patent has the beneficial effects of simple structure, reasonable design, strong versatility, and easy operation.

Although the above anchor shear test device has the advantages of simple structure and reasonable design, we found in practical application that it still has certain shortcomings, such as:

The above anchor bolt shear test device can only perform shear tests on individual positions of the anchor bolt, which is not only inconvenient to adjust the shear position, but also unable to adjust the shear distance;

Based on this, we proposed a shear test device for concrete anchor bolts, hoping to solve the shortcomings of the existing technology.

Summary of the invention

1. Technical issues to be solved

In view of the deficiencies in the prior art, the present invention provides a concrete anchor shear test device, which has the advantage of being easy to adjust the shear position and shear distance.

(II) Technical solution

In order to achieve the above-mentioned purpose of facilitating the adjustment of the shear position and the shear distance, the present invention provides the following technical solutions: a concrete anchor shear test device, comprising a test box, an inner cavity is formed at the upper part of the inner part of the test box, a vertical groove is formed in the middle of the inner top wall of the inner cavity, an anchor bolt is movably arranged in the inner part of the vertical groove, and the anchor bolt is vertically arranged in the inner part of the inner cavity;

A driving cavity is formed at the lower part of the interior of the test box, and two frame grooves are respectively provided between the driving cavity and the inner cavity, one on the left and the other on the right, and connecting frames are movably arranged inside the two frame grooves, and a first clamping rod and a second clamping rod are fixedly installed at the top of the two connecting frames, respectively, and a first fixing plate is fixedly installed at both ends of the first clamping rod, and a first shearing block is movably arranged between the two first fixing plates, and a second fixing plate is fixedly installed at both ends of the second clamping rod, and a second shearing block is movably arranged between the two second fixing plates.

As a preferred technical solution of the present invention, a screw is rotatably arranged inside the driving chamber, and a first thread and a second thread with opposite rotation directions are respectively provided on the left and right sides of the outer wall of the screw, and the outer walls of the first thread and the second thread are respectively threadedly connected with a first nut and a second nut, and the two connecting frames are respectively fixed on the top of the first nut and the second nut.

As a preferred technical solution of the present invention, the end of the screw extends to the outside of the test box and is fixedly connected to a driving wheel, the outer wall of the driving wheel is engaged with a driving rack, the driving rack is fixedly mounted on the bottom of the output shaft of the hydraulic cylinder, and the hydraulic cylinder is fixedly mounted on the outer wall of the test box.

As a preferred technical solution of the present invention, a first screw rod is rotatably arranged between the two first fixing plates, the first shear block is threadedly connected to the outer wall of the first screw rod, and the first shear block is slidably arranged on the outer wall of the first clamping rod;

A second screw rod is rotatably arranged between the two second fixing plates, the second shear block is threadedly connected to the outer wall of the second screw rod, and the second shear block is slidably arranged on the outer wall of the second clamping rod.

As a preferred technical solution of the present invention, the top end of the first screw rod extends to the outside of the test box and is fixedly connected to the first knob, and the top end of the second screw rod extends to the outside of the test box and is fixedly connected to the second knob.

As a preferred technical solution of the present invention, the lower part of the inner wall of the vertical groove is threadedly connected to a supporting cylinder, the upper part of the inner wall of the vertical groove is threadedly connected to a limiting cylinder, and the outer wall of the anchor bolt is formed with a convex edge, which is clamped between the supporting cylinder and the limiting cylinder.

As a preferred technical solution of the present invention, the first thread and the second thread are respectively threadedly connected with a first moving block and a second moving block, the first moving block and the second moving block are both slidably arranged on the inner bottom wall of the driving cavity, and the first moving block and the second moving block are located between the first nut and the second nut;

The top of the first moving block is hinged to the left side of the bottom of the top plate through a first hinge rod, and the top of the second moving block is hinged to the right side of the bottom of the top plate through a second hinge rod.

As a preferred technical solution of the present invention, the first hinge rod and the second hinge rod are movably arranged inside the movable groove, and the movable groove is opened on the inner top wall of the driving cavity;

The top plate is movably arranged on the inner wall of the plate groove, the plate groove is through-opened between the inner cavity and the movable groove, and the top plate is movably arranged below the anchor bolt.

As a preferred technical solution of the present invention, the vertical groove is opened inside the vertical tube, the vertical tube is movably arranged on the inner wall of the tube groove, and the tube groove is opened in the middle of the top wall of the inner cavity.

As a preferred technical solution of the present invention, the top of the vertical tube is fixedly connected to the lifting mechanism through a suspension rod.

(III) Beneficial effects

Compared with the prior art, the present invention provides a concrete anchor shear test device, which has the following beneficial effects:

1. The concrete anchor bolt shear test device, the anchor bolt is vertically arranged in the inner cavity, the output shaft of the hydraulic cylinder extends out to drive the driving rack to move downward, the driving rack moves downward to drive the driving wheel meshed with its outer wall to rotate, the driving wheel rotates to drive the screw rod, the screw rod rotates through the first thread and the second thread of the outer wall with opposite rotation directions to make the first nut and the second nut approach each other, the first nut and the second nut approach each other through the connecting frame, the first clamping rod and the second clamping rod approach each other, when the first clamping rod and the second clamping rod approach each other, the anchor bolt can be sheared through the first shear block and the second shear block to judge the shear resistance of the anchor bolt, which is very convenient to use.

2. The concrete anchor bolt shear test device can rotate the first screw rod by turning the first knob, and the rotation of the first screw rod drives the first shear block connected to the outer wall threadedly to move up and down. The second screw rod can rotate by turning the second knob, and the rotation of the second screw rod drives the second shear block connected to the outer wall threadedly to move up and down. Therefore, it is convenient to adjust the positions of the first shear block and the second shear block, and it is convenient to perform shear tests on different positions of the anchor bolt or perform shear tests on the anchor bolt at different distances.

3. The concrete anchor shear test device, the supporting tube and the limiting tube are both threadedly connected in the vertical groove, the convex edge of the anchor is clamped between the supporting tube and the limiting tube, so as to fix the position of the anchor, and the fixed position of the anchor can be adjusted by adjusting the positions of the supporting tube and the limiting tube in the vertical groove;

When it is necessary to perform a shear test on the anchor bolts separately, the anchor bolts can be fixed at a higher position so that their bottom is away from the top plate;

When it is necessary to conduct a mixed test of shear and extrusion on the anchor bolt, the anchor bolt can be fixed in a lower position so that its bottom is close to the top plate. At this time, the screw rod is controlled to rotate. On the one hand, the screw rod will make the first shear block and the second shear block approach each other through the connecting frame to shear the anchor bolt. On the other hand, it will also make the first moving block and the second moving block approach each other. When the first moving block and the second moving block are close to each other, the top plate can be lifted up by the first hinged rod and the second hinged rod. The lifted top plate squeezes the bottom of the anchor bolt. Since the top of the anchor bolt is fixed, the anchor bolt is subjected to the shear force of the first shear block and the second shear block and the extrusion force of the top plate at the same time. This makes it easier to simulate the stress condition of the anchor bolt in actual working conditions. The test results are more accurate, and it is easier to evaluate the mechanical properties of the anchor bolt.

4. When the anchor bolt needs to be subjected to a mixed shear and tensile test, the anchor bolt can be fixed at a higher position, and the first shear block and the second shear block are first brought close to each other and clamped by a screw rod. After the first shear block and the second shear block clamp the anchor bolt, the first shear block and the second shear block are brought close to each other again, and the lifting mechanism is used to lift the vertical cylinder through the lifting rod.

The first shear block and the second shear block are brought close to each other again to shear the anchor bolt, and the lifting mechanism lifts the vertical cylinder through the lifting rod to drive the anchor bolt to move upward as a whole, and stretch the anchor bolt. At this time, the anchor bolt is simultaneously subjected to the shear force of the first shear block and the second shear block and the tensile force of the lifting mechanism, which is more convenient to simulate the stress condition of the anchor bolt in actual working conditions and evaluate the mechanical properties of the anchor bolt.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a perspective schematic diagram of the overall structure of the present invention;

Fig. 2 is a cross-sectional view of the overall structure of the present invention;

FIG3 is an enlarged schematic diagram of point A in FIG2 of the present invention;

FIG4 is an enlarged schematic diagram of the screw portion of the present invention;

FIG5 is an enlarged schematic diagram of the anchor bolt portion of the present invention;

FIG6 is a front cross-sectional view of the overall structure of the present invention;

FIG7 is an enlarged schematic diagram of the top plate portion of the present invention;

FIG8 is a cross-sectional view of a vertical cylinder portion of the present invention;

FIG. 9 is a perspective schematic diagram of the vertical cylinder portion of the present invention.

In the figure: 1, test box; 2, inner cavity; 3, vertical groove; 4, anchor bolt; 5, convex edge; 6, supporting tube; 7, limiting tube; 8, driving cavity; 9, screw; 10, first thread; 11, second thread; 12, first nut; 13, second nut; 14, connecting frame; 15, first clamping rod; 16, second clamping rod; 17, first fixed plate; 18, second fixed plate; 19, first shear block; 20, second shear block; 21, first screw rod; 22, first knob; 23, second screw rod; 24, second knob; 25, driving wheel; 26, driving rack; 27, hydraulic cylinder; 28, first moving block; 29, second moving block; 30, first hinged rod; 31, second hinged rod; 32, top plate; 33, movable groove; 34, plate groove; 35, vertical tube; 36, tube groove; 37, suspension rod.

DETAILED DESCRIPTION

Embodiment 1:

Referring to FIG. 1 , FIG. 2 and FIG. 4 , a concrete anchor shear test device comprises a test box 1, an inner cavity 2 is formed at the upper part of the inner part of the test box 1, a vertical groove 3 is formed at the middle part of the inner top wall of the inner cavity 2, an anchor 4 is movably arranged inside the vertical groove 3, and the anchor 4 is vertically arranged inside the inner cavity 2;

Please refer to Figures 2 and 4. A driving cavity 8 is formed at the lower part of the interior of the test box 1. Two frame grooves are respectively provided between the driving cavity 8 and the inner cavity 2, one on the left and the other on the right. Connecting frames 14 are movably provided inside the two frame grooves. A first clamping rod 15 and a second clamping rod 16 are respectively fixedly installed at the tops of the two connecting frames 14. First fixing plates 17 are fixedly installed at both ends of the first clamping rod 15. A first shearing block 19 is movably provided between the two first fixing plates 17. Second fixing plates 18 are fixedly installed at both ends of the second clamping rod 16. A second shearing block 20 is movably provided between the two second fixing plates 18. When the two connecting frames 14 are close to each other, the first clamping rod 15 and the second clamping rod 16 can make the first shearing block 19 and the second shearing block 20 close to each other (the first shearing block 19 and the second shearing block 20 are staggered with each other) so as to shear the anchor bolt 4.

In this embodiment, please refer to FIG. 2 , a screw rod 9 is rotatably arranged inside the driving chamber 8, and a first thread 10 and a second thread 11 with opposite rotation directions are respectively provided on the left and right sides of the outer wall of the screw rod 9, and the outer walls of the first thread 10 and the second thread 11 are respectively threadedly connected with a first nut 12 and a second nut 13, and two connecting frames 14 are respectively fixed on the top of the first nut 12 and the second nut 13, and when the screw rod 9 rotates, the first thread 10 and the second thread 11 with opposite rotation directions on the outer wall thereof can make the first nut 12 and the second nut 13 approach each other, and the first nut 12 and the second nut 13 approach each other, and the first clamping rod 15 and the second clamping rod 16 can be approached to each other through the connecting frame 14;

As shown in FIG2 , the end of the screw 9 extends to the outside of the test box 1 and is fixedly connected to a driving wheel 25, the outer wall of the driving wheel 25 is meshed with a driving rack 26, and the driving rack 26 is fixedly mounted on the bottom of the output shaft of the hydraulic cylinder 27, and the hydraulic cylinder 27 is fixedly mounted on the outer wall of the test box 1;

The anchor bolt 4 is vertically arranged in the inner cavity 2, and the output shaft of the hydraulic cylinder 27 extends to drive the driving rack 26 to move downward. The driving rack 26 moves downward to drive the driving wheel 25 engaged with its outer wall to rotate. The rotation of the driving wheel 25 drives the screw rod 9 to rotate. The screw rod 9 rotates through the first thread 10 and the second thread 11 on its outer wall that rotate in opposite directions to make the first nut 12 and the second nut 13 approach each other. The first nut 12 and the second nut 13 approach each other, and the first clamping rod 15 and the second clamping rod 16 can be approached to each other through the connecting frame 14. When the first clamping rod 15 and the second clamping rod 16 approach each other, the shear test of the anchor bolt 4 can be carried out through the first shear block 19 and the second shear block 20 to test the shear resistance of the anchor bolt 4, which is very convenient to use.

Embodiment 2:

Please refer to FIG. 2 and FIG. 4 . On the basis of the first embodiment, a first screw rod 21 is rotatably arranged between the two first fixing plates 17, a first shear block 19 is threadedly connected to the outer wall of the first screw rod 21, and the first shear block 19 is slidably arranged on the outer wall of the first clamping rod 15, a second screw rod 23 is rotatably arranged between the two second fixing plates 18, a second shear block 20 is threadedly connected to the outer wall of the second screw rod 23, and the second shear block 20 is slidably arranged on the outer wall of the second clamping rod 16;

The first screw rod 21 rotates to drive the first shear block 19 connected to the outer wall of the screw rod 21 to move up and down, and the second screw rod 23 rotates to drive the second shear block 20 connected to the outer wall of the screw rod 23 to move up and down, thereby facilitating the adjustment of the positions of the first shear block 19 and the second shear block 20, and facilitating the shear test of the anchor bolt 4 at different positions or at different distances;

The top end of the first screw rod 21 extends to the outside of the test box 1 and is fixedly connected to the first knob 22, and the top end of the second screw rod 23 extends to the outside of the test box 1 and is fixedly connected to the second knob 24. The rotation of the first screw rod 21 can be controlled by the first knob 22, and the rotation of the second screw rod 23 can be controlled by the second knob 24, which is more convenient to control;

As shown in FIG. 2 , in order to facilitate the movement of the first screw rod 21 and the second screw rod 23 , the inner top wall of the inner cavity 2 is further provided with a rod groove matching the first screw rod 21 and the second screw rod 23 .

Embodiment three:

Please refer to Figures 3, 5, 6 and 7. On the basis of the first or second embodiment, the lower part of the inner wall of the vertical groove 3 is threadedly connected to the supporting cylinder 6, the upper part of the inner wall of the vertical groove 3 is threadedly connected to the limiting cylinder 7, and the outer wall of the anchor bolt 4 is formed with a convex edge 5, which is clamped between the supporting cylinder 6 and the limiting cylinder 7;

The supporting tube 6 and the limiting tube 7 are both threadedly connected in the vertical groove 3, and the convex edge 5 of the anchor bolt 4 is clamped between the supporting tube 6 and the limiting tube 7, so as to fix the position of the anchor bolt 4. By adjusting the positions of the supporting tube 6 and the limiting tube 7 in the vertical groove 3, the fixing position of the anchor bolt 4 can be adjusted;

The first thread 10 and the second thread 11 are respectively threadedly connected with a first moving block 28 and a second moving block 29, which are both slidably arranged on the inner bottom wall of the driving chamber 8, and the first moving block 28 and the second moving block 29 are located between the first nut 12 and the second nut 13, the top of the first moving block 28 is hinged to the left side of the bottom of the top plate 32 through the first hinge rod 30, and the top of the second moving block 29 is hinged to the right side of the bottom of the top plate 32 through the second hinge rod 31;

As shown in FIG6 , the first hinge rod 30 and the second hinge rod 31 are movably arranged inside the movable groove 33, the movable groove 33 is provided on the inner top wall of the driving cavity 8, the top plate 32 is movably arranged on the inner wall of the plate groove 34, the plate groove 34 is through-opened between the inner cavity 2 and the movable groove 33, and the top plate 32 is movably arranged below the anchor bolt 4;

When it is necessary to perform a shear test on the anchor bolt 4 alone, the anchor bolt 4 can be fixed at a higher position (when the top plate 32 is raised, it will not act on the anchor bolt 4), so that its bottom is away from the top plate 32;

When it is necessary to perform a mixed test of shear and extrusion on the anchor bolt 4, the anchor bolt 4 can be fixed in a lower position so that its bottom is close to the top plate 32. At this time, the screw rod 9 is controlled to rotate. On the one hand, the screw rod 9 will make the first shear block 19 and the second shear block 20 approach each other through the connecting frame 14 to shear the anchor bolt 4. On the other hand, it will also make the first movable block 28 and the second movable block 29 approach each other. When the first movable block 28 and the second movable block 29 are close to each other, the top plate 32 can be lifted up through the first hinge rod 30 and the second hinge rod 31. The lifted top plate 32 squeezes the bottom of the anchor bolt 4. Since the top of the anchor bolt 4 is fixed, the anchor bolt 4 is simultaneously subjected to the shear force of the first shear block 19 and the second shear block 20 and the extrusion force of the top plate 32, which is more convenient to simulate the stress condition of the anchor bolt 4 in actual working conditions. The test results are more accurate, and it is easier to evaluate the mechanical properties of the anchor bolt 4.

Embodiment 4:

Please refer to Figures 8 and 9. On the basis of the first embodiment, the second embodiment or the third embodiment, the vertical groove 3 is provided inside the vertical cylinder 35. The vertical cylinder 35 is movably provided on the inner wall of the cylinder groove 36. The cylinder groove 36 is provided in the middle of the inner top wall of the inner cavity 2. The top of the vertical cylinder 35 is fixedly connected to the lifting mechanism through the suspension rod 37. In this embodiment, the lifting mechanism can be an electric telescopic rod or other telescopic devices.

When the anchor bolt 4 needs to be subjected to a mixed shear and tensile test, the anchor bolt 4 can be fixed at a higher position (the top plate 32 will not act on the anchor bolt 4 when it is raised), and the first shear block 19 and the second shear block 20 are brought close to each other to clamp the anchor bolt 4 through the screw rod 9. After the first shear block 19 and the second shear block 20 clamp the anchor bolt 4, the first shear block 19 and the second shear block 20 are brought close to each other again, and the lifting mechanism is used to lift the vertical cylinder 35 through the lifting rod 37.

The first shear block 19 and the second shear block 20 are brought close to each other again to shear the anchor bolt 4. The lifting mechanism lifts the vertical cylinder 35 through the lifting rod 37 to drive the anchor bolt 4 to move upward as a whole, and stretch the anchor bolt 4. At this time, the anchor bolt 4 is simultaneously subjected to the shear force of the first shear block 19 and the second shear block 20 and the stretching force of the lifting mechanism, which is more convenient to simulate the stress condition of the anchor bolt 4 in the actual working condition and evaluate the mechanical properties of the anchor bolt 4.

Therefore, in the above embodiment, the shear test, the extrusion plus shear test, and the tensile plus shear test can be respectively implemented on the anchor bolt 4, the functions are more diversified, the detection is more comprehensive, and the tensile, compressive and shear properties of the anchor bolt 4 can be fully reflected.

The working principle and use process of the present invention:

The anchor bolt 4 is vertically arranged in the inner cavity 2, and the output shaft of the hydraulic cylinder 27 extends to drive the driving rack 26 to move downward, and the driving rack 26 moves downward to drive the driving wheel 25 meshed with its outer wall to rotate, and the driving wheel 25 rotates to drive the screw rod 9 to rotate, and the screw rod 9 rotates to make the first nut 12 and the second nut 13 approach each other through the first thread 10 and the second thread 11 of the outer wall rotating in opposite directions, and the first nut 12 and the second nut 13 approach each other through the connecting frame 14, and the first clamping rod 15 and the second clamping rod 16 approach each other. When the first clamping rod 15 and the second clamping rod 16 approach each other, the shear test of the anchor bolt 4 can be carried out through the first shear block 19 and the second shear block 20 to judge the shear resistance of the anchor bolt 4, which is very convenient to use;

The first screw rod 21 can be rotated by turning the first knob 22, and the first screw rod 21 rotates to drive the first shear block 19 connected to the outer wall of the screw rod 21 to move up and down. The second screw rod 23 can be rotated by turning the second knob 24, and the second screw rod 23 rotates to drive the second shear block 20 connected to the outer wall of the screw rod 23 to move up and down. Thus, it is convenient to adjust the positions of the first shear block 19 and the second shear block 20, and it is convenient to perform shear tests on different positions of the anchor bolt 4 or perform shear tests on the anchor bolt 4 at different distances.

The supporting tube 6 and the limiting tube 7 are both threadedly connected in the vertical groove 3, and the convex edge 5 of the anchor bolt 4 is clamped between the supporting tube 6 and the limiting tube 7, so as to fix the position of the anchor bolt 4. By adjusting the positions of the supporting tube 6 and the limiting tube 7 in the vertical groove 3, the fixing position of the anchor bolt 4 can be adjusted;

When it is necessary to perform a shear test on the anchor bolt 4 alone, the anchor bolt 4 can be fixed at a higher position so that its bottom is away from the top plate 32;

When it is necessary to perform a mixed test of shearing and extrusion on the anchor bolt 4, the anchor bolt 4 can be fixed at a lower position so that its bottom is close to the top plate 32. At this time, the screw rod 9 is controlled to rotate. On the one hand, the screw rod 9 will make the first shear block 19 and the second shear block 20 approach each other through the connecting frame 14 to shear the anchor bolt 4. On the other hand, it will also make the first moving block 28 and the second moving block 29 approach each other. When the first moving block 28 and the second moving block 29 are close to each other, the top plate 32 can be lifted up through the first hinge rod 30 and the second hinge rod 31. The lifted top plate 32 squeezes the bottom of the anchor bolt 4. Since the top of the anchor bolt 4 is fixed, the anchor bolt 4 is simultaneously subjected to the shear force of the first shear block 19 and the second shear block 20 and the extrusion force of the top plate 32, which is more convenient to simulate the stress condition of the anchor bolt 4 in the actual working condition, and the test result is more accurate, which is more convenient to evaluate the mechanical properties of the anchor bolt 4.

When a mixed shear and tensile test is required for the anchor bolt 4, the anchor bolt 4 can be fixed at a higher position, and the first shear block 19 and the second shear block 20 are brought close to each other to clamp the anchor bolt 4 through the screw rod 9. After the first shear block 19 and the second shear block 20 clamp the anchor bolt 4, the first shear block 19 and the second shear block 20 are brought close to each other again, and the lifting mechanism is used to lift the vertical cylinder 35 through the lifting rod 37.

The first shear block 19 and the second shear block 20 are brought close to each other again to shear the anchor bolt 4. The lifting mechanism lifts the vertical cylinder 35 through the lifting rod 37 to drive the anchor bolt 4 to move upward as a whole and stretch the anchor bolt 4. At this time, the anchor bolt 4 is simultaneously subjected to the shear force of the first shear block 19 and the second shear block 20 and the stretching force of the lifting mechanism, which is more convenient to simulate the stress condition of the anchor bolt 4 in actual working conditions and evaluate the mechanical properties of the anchor bolt 4.

Claims (5)

1. The utility model provides an crab-bolt shear test device for concrete, includes test box (1), its characterized in that: an inner cavity (2) is formed above the inside of the test box (1), a vertical groove (3) is formed in the middle of the inner top wall of the inner cavity (2), an anchor bolt (4) is movably arranged in the vertical groove (3), and the anchor bolt (4) is vertically arranged in the inner cavity (2);

A driving cavity (8) is formed below the inside of the test box (1), two frame grooves are respectively formed between the driving cavity (8) and the inner cavity (2) in a left-right penetrating way, connecting frames (14) are movably arranged inside the two frame grooves, a first clamping rod (15) and a second clamping rod (16) are respectively and fixedly arranged at the top ends of the two connecting frames (14), first fixing plates (17) are fixedly arranged at the two ends of the first clamping rod (15), first shearing blocks (19) are movably arranged between the two first fixing plates (17), second fixing plates (18) are fixedly arranged at the two ends of the second clamping rod (16), and second shearing blocks (20) are movably arranged between the two second fixing plates (18);

The inside of the driving cavity (8) is rotatably provided with a screw (9), the left side and the right side of the outer wall of the screw (9) are respectively provided with a first thread (10) and a second thread (11) with opposite screwing directions, the outer walls of the first thread (10) and the second thread (11) are respectively in threaded connection with a first nut (12) and a second nut (13), and two connecting frames (14) are respectively fixedly arranged at the tops of the first nut (12) and the second nut (13);

the lower part of the inner wall of the vertical groove (3) is in threaded connection with a bearing cylinder (6), the upper part of the inner wall of the vertical groove (3) is in threaded connection with a limiting cylinder (7), the outer wall of the anchor bolt (4) is formed with a convex edge (5), and the convex edge (5) is clamped between the bearing cylinder (6) and the limiting cylinder (7);

the first screw thread (10) and the second screw thread (11) are also respectively connected with a first moving block (28) and a second moving block (29) in a threaded manner, the first moving block (28) and the second moving block (29) are both arranged on the inner bottom wall of the driving cavity (8) in a sliding manner, and the first moving block (28) and the second moving block (29) are positioned between the first nut (12) and the second nut (13);

The top of the first moving block (28) is hinged to the left side of the bottom of the top plate (32) through a first hinging rod (30), and the top of the second moving block (29) is hinged to the right side of the bottom of the top plate (32) through a second hinging rod (31);

the first hinging rod (30) and the second hinging rod (31) are movably arranged in the movable groove (33), and the movable groove (33) is formed in the inner top wall of the driving cavity (8);

The top plate (32) is movably arranged on the inner wall of the plate groove (34), the plate groove (34) is arranged between the inner cavity (2) and the movable groove (33) in a penetrating way, and the top plate (32) is movably arranged below the anchor bolt (4);

the vertical groove (3) is formed in the vertical cylinder (35), the vertical cylinder (35) is movably arranged on the inner wall of the cylinder groove (36), and the cylinder groove (36) is formed in the middle of the inner top wall of the inner cavity (2).

2. The anchor bolt shear test device for concrete according to claim 1, wherein: the tail end of the screw rod (9) extends to the outside of the test box (1) and is fixedly connected with a driving wheel (25), a driving rack (26) is meshed with the outer wall of the driving wheel (25), the driving rack (26) is fixedly arranged at the bottom of an output shaft of a hydraulic cylinder (27), and the hydraulic cylinder (27) is fixedly arranged on the outer wall of the test box (1).

3. The anchor bolt shear test device for concrete according to claim 1, wherein: a first screw rod (21) is rotatably arranged between the two first fixing plates (17), the first shearing block (19) is in threaded connection with the outer wall of the first screw rod (21), and the first shearing block (19) is slidably arranged on the outer wall of the first clamping rod (15);

And a second screw rod (23) is rotatably arranged between the two second fixing plates (18), the second shearing block (20) is in threaded connection with the outer wall of the second screw rod (23), and the second shearing block (20) is slidably arranged on the outer wall of the second clamping rod (16).

4. An anchor bolt shear test device for concrete according to claim 3, wherein: the top end of the first screw rod (21) extends to the outside of the test box (1) and is fixedly connected with a first knob (22), and the top end of the second screw rod (23) extends to the outside of the test box (1) and is fixedly connected with a second knob (24).

5. The anchor bolt shear test device for concrete according to claim 1, wherein: the top of the vertical cylinder (35) is fixedly connected with the lifting mechanism through a hanging rod (37).