Multi-angle pavement interlayer bonding strength testing device

Abstract

The utility model provides a multi-angle pavement interlayer bonding strength testing device, and belongs to the technical field of shear strength testing. The multi-angle pavement interlayer bonding strength testing device comprises a loading rod, a detection box and an interlayer shearing piece. The first shearing structure and the second shearing structure abut against the two sides, away from each other, of the upper-layer testing structure and the lower-layer testing structure respectively, one end of the loading rod penetrates through the first connecting through hole and is connected to the first cover plate, loads are applied through the loading rod, and the bonding strength of the bonding test piece is measured; the first cover plate can be connected to different positions on the first shearing structure, and the second cover plate can be connected to different positions on the second shearing structure, so that the included angle between the axis of the bonding test piece and the axis of the loading rod can be adjusted, and the test angle of the bonding test piece can be adjusted; the problems that the angle of an existing oblique shear test is fixed, and corresponding loading grinding tools need to be customized when tests at different angles are carried out are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a shearing strength test technical field, concretely relates to a multi-angle road surface interlayer bonding strength testing device. BACKGROUND

[0002] The interlayer bonding of each layer of asphalt pavement is one of the key parameters influencing the pavement mechanical properties, and the construction quality is very important in the pavement construction. The current commonly used interlayer bonding strength test includes direct shear test, oblique shear test and pull-out test. The direct shear test tests the strength of the interlayer bonding at an angle of 90 degrees, the pull-out test is at an angle of 0 degrees, and the angle of the oblique shear test depends on the angle of the grinding tool. The oblique shear test is more similar to the actual pavement stress gradient and vehicle load action, and is therefore commonly used for interlayer bonding strength detection of the pavement. However, the oblique shear test is limited by the grinding tool, and the existing oblique shear test angle is fixed, and different test angles require corresponding loading grinding tools. SUMMARY

[0003] The utility model discloses a multi-angle road surface interlayer bonding strength testing device aiming at the deficiency of the prior art.

[0004] The utility model discloses a multi-angle road surface interlayer bonding strength testing device is used to test the strength of bonding test piece, including loading rod, detection box, setting in the interlayer shear piece of detection box inside, first connecting through -hole is equipped with on the detection box, the interlayer shear piece includes first shear structure, first cover plate, second cover plate, second shear structure, the bonding test piece includes upper layer test structure, with the lower layer test structure of upper layer test structure connection, first shear structure, second shear structure respectively abuts on the two side parts of upper layer test structure, lower layer test structure and is far away from each other, for bonding test piece clamping, the one end of loading rod passes through first connecting through -hole and is connected to first cover plate, the included angle of the axis of loading rod and the axis of bonding test piece is acute angle, first cover plate can be connected to different positions on first shear structure, second cover plate can be connected to different positions on second shear structure, for adjusting the included angle between the axis of bonding test piece and the axis of loading rod.

[0005] Further, it further includes a sealing ring for sealing the gap between the loading rod and the detection box, the inner side wall of the sealing ring is sleeved on the part of the loading rod outside the detection box, and the sealing ring abuts against the outer side wall of the detection box.

[0006] Further, the detection box includes a top plate and a bottom plate parallel to the top plate, the first connecting through-hole is provided through the top plate, the axis of the loading rod is perpendicular to the plane of the top plate, and the second cover plate abuts against the top of the bottom plate.

[0007] Further, the upper test structure comprises a first side, a second side arranged opposite to the first side, and a third side connected to the first side and the second side respectively, the lower test structure comprises a fourth side, a fifth side arranged opposite to the fourth side, and a sixth side connected to the fourth side and the fifth side respectively, the fourth side is bonded to the first side, and the sixth side is arranged opposite to the third side; the first shear structure comprises a first base, and a first limiting part connected to one side of the first base, the second shear structure comprises a second base, and a second limiting part connected to one side of the second base, the first base abuts against the second side, the first limiting part abuts against the third side, the second base abuts against the fifth side, and the second limiting part abuts against the sixth side.

[0008] Further, the first shear structure further comprises a first arc-shaped connecting part connected to one side of the first base away from the first limiting part, the first cover plate comprises a third base and a second arc-shaped connecting part connected to the third base, one side of the third base away from the second arc-shaped connecting part is connected to the loading rod, and the second arc-shaped connecting part can be connected to different positions of the first arc-shaped connecting part in a mortise and tenon manner.

[0009] Further, the second shear structure further comprises a third arc-shaped connecting part connected to one side of the second base away from the second limiting part, the second cover plate comprises a fourth base and a fourth arc-shaped connecting part connected to the fourth base, one side of the fourth base away from the fourth arc-shaped connecting part abuts against the bottom plate, and the fourth arc-shaped connecting part can be connected to different positions of the third arc-shaped connecting part in a mortise and tenon manner.

[0010] Further, one side of the fourth base abutting against the bottom plate is provided with a plurality of rollers.

[0011] Further, the first arc-shaped connecting part comprises a plurality of first connecting sawteeth arranged at equal distances, the second arc-shaped connecting part comprises at least one first groove, one first groove is connected to one corresponding first connecting sawtooth in a mortise and tenon manner, and the central angle corresponding to one first connecting sawtooth is 4.5-5.5 degrees.

[0012] Further, one side of the third base away from the second arc-shaped connecting part is provided with a first threaded groove, and the bottom of the loading rod is provided with a first threaded part screwed into the first threaded groove.

[0013] Further, the top of the loading rod is provided with a second threaded part, and the device further comprises a force applying plate with a cross-sectional area greater than that of the loading rod, the force applying plate is provided with a second threaded groove, and the second threaded part is screwed into the second threaded groove.

[0014] The multi-angle road surface interlayer bonding strength testing device has the following beneficial effects:

[0015] The first and second shearing structures abut against two side portions of the upper and lower test structures respectively, one end of the loading rod passes through the first connecting through hole and is connected to the first cover plate, a load is applied through the loading rod, the bonding strength of the bonding test piece is measured, the first cover plate can be connected to different positions on the first shearing structure, the second cover plate can be connected to different positions on the second shearing structure, the included angle between the axis of the bonding test piece and the axis of the loading rod can be adjusted, the test angle of the bonding test piece is adjusted, and the problem that the test angle of the existing oblique shearing is fixed and corresponding loading molds need to be customized when different angle tests are performed is solved. BRIEF DESCRIPTION OF DRAWINGS

[0016] The accompanying drawings, which are incorporated into and form a part of the specification, illustrate an embodiment of the present application and, together with the description, serve to explain the principles of the application. In the drawings, like reference numerals are used to represent similar elements. The drawings in the following description are some embodiments of the present application, not all embodiments. For those skilled in the art, other drawings can be obtained from these drawings without creative labor.

[0017] Fig. 1 Part of the structure of the detection box when the multi-angle pavement interlayer bonding strength testing device is cut open;

[0018] Fig. 2 Part of the multi-angle pavement interlayer bonding strength testing device when the third base body is connected with the loading rod;

[0019] Fig. 3 Part of the multi-angle pavement interlayer bonding strength testing device when the force applying plate is connected with the loading rod.

[0020] In the figure: 1-detection box, 11-top plate, 12-bottom plate, 2-bonding test piece, 3-first shearing structure, 31-first base body, 32-first limiting portion, 33-first arc-shaped connecting portion, 4-first cover plate, 41-third base body, 411-first threaded groove, 42-second arc-shaped connecting portion, 5-second shearing structure, 51-second base body, 52-second limiting portion, 53-third arc-shaped connecting portion, 6-second cover plate, 61-fourth base body, 62-fourth arc-shaped connecting portion, 63-roller, 7-loading rod, 8-sealing ring, 9-force applying plate, 91-second threaded groove. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme of the embodiments of the utility model will be described clearly and completely in combination with the drawings in the embodiments of the utility model below. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skilled in the art without making creative labor belong to the protection scope of the utility model. It should be noted that the embodiments in the application and the features in the embodiments can be combined with each other in any way without conflict.

[0022] Please refer to Figs. 1-3 The multi-angle road surface interlayer bonding strength testing device of the embodiments of the utility model is used to test the strength of the bonding test piece 2, comprising a loading rod 7, a detection box 1, an interlayer shear piece arranged on the inner side of the detection box 1; a first connecting through hole is arranged on the detection box 1, the interlayer shear piece comprises a first shear structure 3, a first cover plate 4, a second cover plate 6 and a second shear structure 5, the bonding test piece 2 comprises an upper layer test structure and a lower layer test structure connected with the upper layer test structure; the first shear structure 3 and the second shear structure 5 are respectively abutted on the two sides of the upper layer test structure and the lower layer test structure away from each other, so as to clamp the bonding test piece; one end of the loading rod 7 passes through the first connecting through hole and is connected to the first cover plate 4, and the included angle between the axis of the loading rod 7 and the axis of the bonding test piece 2 is an acute angle; the first cover plate 4 can be connected to different positions on the first shear structure 3, and the second cover plate 6 can be connected to different positions on the second shear structure 5, so as to adjust the included angle between the axis of the bonding test piece 2 and the axis of the loading rod 7.

[0023] The inner side of the detection box 1 can be hollow, the second cover plate 6 can be connected to the inner side wall of the detection box 1, the lower test structure can be bonded to the upper test structure, the first shear structure 3 and the second shear structure 5 are respectively abutted to the two sides of the upper test structure and the lower test structure away from each other, so that the first shear structure 3 and the second shear structure 5 jointly clamp the bonded test piece 2; the first cover plate 4 is connected to the first position of the side surface of the first shear structure 3 away from the upper test structure, and the second cover plate 6 is connected to the second position of the side surface of the second shear structure 5 away from the lower test structure, so that the angle between the axis of the bonded test piece 2 and the axis of the loading rod 7 is a first angle, one end of the loading rod 7 passes through the first connecting through hole and is connected to the side surface of the first cover plate 4 away from the first shear structure 3, and the load is applied through the loading rod 7, so as to apply the load to the bonded test piece 2 and measure the bonding strength of the bonded test piece 2 at the test angle of the first angle; since the first cover plate 4 can be connected to different positions on the first shear structure 3, and the second cover plate 6 can be connected to different positions on the second shear structure 5, when it is necessary to adjust the test angle of the bonded test piece 2, the first cover plate 4 is connected to the third position of the side surface of the first shear structure 3 away from the upper test structure, and the second cover plate 6 is connected to the fourth position of the side surface of the second shear structure 5 away from the lower test structure, so that the angle between the axis of the bonded test piece 2 and the axis of the loading rod 7 is a second angle, and the load is applied again through the loading rod 7, so as to apply the load to the bonded test piece 2 again and measure the bonding strength of the bonded test piece 2 at the test angle of the second angle. When the bonding strength test at different test angles is performed, the corresponding loading mold does not need to be customized, and the angle between the axis of the bonded test piece 2 and the axis of the loading rod 7 is adjusted through the cooperation of the first cover plate 4, the first shear structure 3, the second cover plate 6 and the second shear structure 5, so as to adjust the test angle of the bonded test piece 2, and the multi-angle interlayer bonding strength test of the bonded test piece 2 is realized.

[0024] The multi-angle pavement interlayer bonding strength test device can further comprise a sealing ring 8 for sealing the gap between the loading rod 7 and the detection box 1, the inner side wall of the sealing ring 8 is sleeved on the part of the loading rod 7 outside the detection box 1, and the sealing ring 8 abuts against the outer side wall of the detection box 1.

[0025] Specifically, the sealing ring 8 can be a rubber sealing ring.

[0026] The detection box 1 comprises a top plate 11 and a bottom plate 12 parallel to the top plate 11, the first connecting through hole is arranged on the top plate 11, the axis of the loading rod 7 is perpendicular to the plane of the top plate 11, and the second cover plate 6 abuts against the top of the bottom plate 12.

[0027] Specifically, the detection box 1 can be a rectangular box body, the detection box 1 is vertically arranged, the bottom plate 12 is horizontally arranged, and the top plate 11 is horizontally arranged. The loading rod 7 can be vertically arranged, the bottom of the sealing ring 8 abuts against the top of the top plate 11, the top of the first cover plate 4 is horizontally arranged, the bottom of the loading rod 7 passes through the first connecting through hole and is connected to the top of the first cover plate 4, the inner side wall of the sealing ring 8 is sleeved on the part of the loading rod 7 above the top plate 11, and the bottom of the sealing ring 8 abuts against the top of the top plate 11, so as to seal the gap between the loading rod 7 and the top plate 11. The detection box 1 can further include three supporting side plates and a protection door, the top and bottom of the supporting side plates are connected to the top plate 11 and the bottom plate 12 respectively, one side end of the protection door is connected to one of the supporting side plates, and the other side end is detachably connected to another supporting side plate. The top and bottom of the protection door can abut against the top plate 11 and the bottom plate 12 respectively, and the supporting side plates and the protection door are perpendicular to the bottom plate 12. By opening the protection door, the interlayer shear member and the adhesive test piece 2 can be placed in the detection box 1, and the interlayer shear member is connected with the adhesive test piece 2 and the loading rod 7 respectively. By closing the protection door, the adhesive strength test can be performed through the loading rod 7. The protection door and / or the supporting side plates can be transparent, which facilitates observation of the test process.

[0028] The upper test structure includes a first side, a second side arranged opposite to the first side, and a third side connected to the first side and the second side respectively. The lower test structure includes a fourth side, a fifth side arranged opposite to the fourth side, and a sixth side connected to the fourth side and the fifth side respectively. The fourth side is bonded to the first side, and the sixth side is arranged opposite to the third side. The first shear structure 3 includes a first base 31 and a first limiting portion 32 connected to one side of the first base 31. The second shear structure 5 includes a second base 51 and a second limiting portion 52 connected to one side of the second base 51. The first base 31 abuts against the second side, the first limiting portion 32 abuts against the third side, the second base 51 abuts against the fifth side, and the second limiting portion 52 abuts against the sixth side.

[0029] Specifically, the fourth side is bonded to the first side, so that the upper test structure and the lower test structure are connected to form the bonding test piece 2, and the second side and the fifth side are oppositely arranged in the bonding test piece 2, and the third side and the sixth side are arranged on both sides of the first axis of the bonding test piece 2 respectively; the upper test structure and the lower test structure can be symmetrically arranged. The height of the third side can be higher than the height of the sixth side. The first base 31 abuts against the second side, the first limiting portion 32 abuts against the third side, the second base 51 abuts against the fifth side, and the second limiting portion 52 abuts against the sixth side. The first base 31 and the second base 51 limit the left and right side surfaces of the bonding test piece 2 respectively, and the first limiting portion 32 and the second limiting portion 52 limit the upper and lower side surfaces of the bonding test piece 2 respectively, so as to clamp the bonding test piece 2. The length of the first base 31 is greater than the length of the second side, the length of the second base 51 is greater than the length of the fifth side, the length of the first limiting portion 32 is less than or equal to the length of the third side, and the length of the second limiting portion 52 can be less than or equal to the length of the sixth side.

[0030] The first shearing structure 3 further comprises a first arc-shaped connecting portion 33 connected to one side surface of the first base 31 away from the first limiting portion 32, and the first cover plate 4 comprises a third base 41 and a second arc-shaped connecting portion 42 connected to the third base 41. One side surface of the third base 41 away from the second arc-shaped connecting portion 42 is connected to the loading rod 7, and the second arc-shaped connecting portion 42 can be connected to different positions on the first arc-shaped connecting portion 33.

[0031] Specifically, the length of the second arc-shaped connecting portion 42 is less than the length of the first arc-shaped connecting portion 33, and the first arc-shaped connecting portion 33 is rotated by a certain angle, so that the second arc-shaped connecting portion 42 is connected to different positions on the first arc-shaped connecting portion 33, and at the same time, the second cover plate 6 is connected to the corresponding positions on the second shearing structure 5, so as to realize the angle adjustment of the bonding test piece 2.

[0032] The second shearing structure 5 further comprises a third arc-shaped connecting portion 53 connected to one side surface of the second base 51 away from the second limiting portion 52, and the second cover plate 6 comprises a fourth base 61 and a fourth arc-shaped connecting portion 62 connected to the fourth base 61. One side surface of the fourth base 61 away from the fourth arc-shaped connecting portion 62 abuts against the bottom plate 12, and the fourth arc-shaped connecting portion 62 can be connected to different positions on the third arc-shaped connecting portion 53.

[0033] Specifically, the length of the fourth arc-shaped connecting portion 62 is less than the length of the third arc-shaped connecting portion 53, and the third arc-shaped connecting portion 53 is rotated by a certain angle, so that the fourth arc-shaped connecting portion 62 is connected to different positions on the third arc-shaped connecting portion 53, and at the same time, the first cover plate 4 is connected to the corresponding positions on the first shearing structure 3, so as to realize the angle adjustment of the bonding test piece 2.

[0034] The fourth base 61 is provided with a plurality of rollers 63 abutting against one side of the base plate 12.

[0035] Specifically, the rollers 63 are arranged on the fourth base 61, and the rollers 63 can move on the base plate 12, so that the second cover plate 6 can move on the base plate 12.

[0036] The first arc-shaped connecting part 33 includes a plurality of first connecting sawteeth arranged at equal intervals, the second arc-shaped connecting part 42 includes at least one first groove, one first groove is connected with one corresponding first connecting sawtooth in a dovetail manner, and the central angle corresponding to one first connecting sawtooth is 4.5-5.5 degrees.

[0037] Specifically, the central angle corresponding to the first arc-shaped connecting part 33 can be 150-180 degrees, the central angle corresponding to one first connecting sawtooth can be 5 degrees, and the minimum value of the angle adjusted by the test piece 2 each time can be 5 degrees.

[0038] Specifically, the third arc-shaped connecting part 53 includes a plurality of second connecting sawteeth arranged at equal intervals, the fourth arc-shaped connecting part 62 includes at least one first groove, one first groove is connected with one corresponding second connecting sawtooth in a dovetail manner, and the central angle corresponding to one second connecting sawtooth is 4.5-5.5 degrees. The central angle corresponding to the third arc-shaped connecting part 53 can be 150-180 degrees, the central angle corresponding to one second connecting sawtooth can be 5 degrees, and the minimum value of the angle adjusted by the test piece 2 each time can be 5 degrees. The first connecting sawtooth and the second connecting sawtooth can be trapezoidal sawteeth.

[0039] Specifically, the interlayer bonding test piece can be made in the laboratory, and it is placed in the interlayer shear piece. Attention should be paid to the positions of the first shear structure 3 and the second shear structure 5. The first shear structure 3 needs to bond the upper test structure of the test piece 2, and the second shear structure 5 needs to support the lower test structure of the test piece 2. The first cover plate 4 is embedded in the first shear structure 3 in a dovetail manner, and the second cover plate 6 is embedded in the second shear structure 5 in a dovetail manner. The second cover plate 6 is provided with rollers 63 at the bottom, so that the second cover plate 6 can move horizontally during loading. The first shear structure 3 is provided with a plurality of first connecting sawteeth in a trapezoidal shape, and the first connecting sawteeth at different positions are connected with the first cover plate 4. The second shear structure 5 is provided with a plurality of second connecting sawteeth in a trapezoidal shape, and the second connecting sawteeth at different positions are connected with the second cover plate 6, so as to realize interlayer bonding strength testing at different angles. The entire interlayer shear piece and the test piece 2 are placed in the detection box 1, the test piece 2 is subjected to load by the loading rod 7, and the interlayer bonding strength is measured.

[0040] The third base 41 is provided with a first threaded groove 411 on the side away from the second arc-shaped connecting part 42, and the bottom of the loading rod 7 is provided with a first threaded part screwing into the first threaded groove 411.

[0041] Specifically, the first threaded part is screwed into the first threaded groove 411, so as to connect the loading rod 7 and the first cover plate 4, and the installation is convenient.

[0042] The top of the loading rod 7 is provided with a second threaded part, and the force plate 9 having a cross-sectional area larger than that of the loading rod 7 is further included, the force plate 9 is provided with a second threaded groove 91, and the second threaded part is screwed into the second threaded groove 91.

[0043] Specifically, the second threaded part is screwed into the second threaded groove 91, so as to connect the force plate 9 to the top of the loading rod 7, the cross-sectional area of the force plate 9 is larger than that of the loading rod 7, the force can be conveniently applied to the force plate 9, so as to exert pressure on the loading rod 7, the loading rod 7 then exerts pressure on the first cover plate 4, and the load applied to the bonded test piece 2 is further realized.

[0044] Specifically, the present application can take the following steps:

[0045] Step one: using the rut plate test, first forming the lower test structure, the size of the lower test structure can be 300m×300mm×50mm, then applying the bonding oil between the layers, i.e. applying the bonding oil on the fourth side, then making the upper test structure, the size of the upper test structure can be 300m×300mm×50mm, bonding the upper test structure to the lower test structure, so as to complete the making of the bonded test piece 2, and cutting the bonded test piece 2 into bonded test pieces 2 with a length and width of 150mm by using a cutting machine;

[0046] Step two: placing the bonded test piece 2 in the interlayer shear piece, adjusting the curvature of the interlayer shear piece according to the required angle, the central angle corresponding to each first connecting sawtooth and each second connecting sawtooth can be 5 degrees, the number of the first connecting sawtooth and the second connecting sawtooth is calculated according to the requirements, the position of the interlayer shear piece is adjusted, then the first cover plate 4 is connected to the first shear structure 3, the second cover plate 6 is connected to the second shear structure 5, then the bonded test piece 2 is placed into the detection box 1 and the loading device, aligned with the loading rod 7, and the load is applied, the loading speed can be 500mm / min, until the bonded test piece 2 is damaged, and the maximum load F is extracted;

[0047] Step three: the bottom plate 12 is horizontally arranged, taking the horizontal line as the reference line, obtaining the angle corresponding to the included angle between the axis of the bonded test piece 2 and the reference line, and taking the angle as the test angle , using the test angle and the maximum load F, and calculating the interlayer bonding strength according to the formula , wherein for adhesive strength.

[0048] The above-described content can be implemented individually or in various combinations, and these variations are within the scope of the present application.

[0049] It should be noted that in the description of the present application, the terms "upper end", "lower end", "bottom end" indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present application is usually placed, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. Moreover, the terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device containing a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without further limitation, the element defined by the statement "includes one" does not exclude the presence of another identical element in the process, method, article or device that includes the element.

[0050] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, and not to limit it. Although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing examples, or make equivalent substitutions for part of the technical features; and these modifications or substitutions do not make the essence of the corresponding technical solution deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A multi-angle pavement interlayer bond strength testing device for testing the strength of bonded specimens (2), characterized in that: The test specimen (2) includes a loading rod (7), a test box (1), and an interlayer shearing member disposed inside the test box (1). A first connecting through hole is provided through the test box (1). The interlayer shearing member includes a first shearing structure (3), a first cover plate (4), a second cover plate (6), and a second shearing structure (5). The bonded test specimen (2) includes an upper test structure and a lower test structure connected to the upper test structure. The first shearing structure (3) and the second shearing structure (5) respectively abut against the upper test structure and the lower test structure. The two sides of the structure are far apart to clamp the bonding specimen (2); one end of the loading rod (7) passes through the first connecting through hole and is connected to the first cover plate (4), and the angle between the axis of the loading rod (7) and the axis of the bonding specimen (2) is an acute angle; the first cover plate (4) can be connected to different positions on the first shear structure (3), and the second cover plate (6) can be connected to different positions on the second shear structure (5) to adjust the angle between the axis of the bonding specimen (2) and the axis of the loading rod (7).

2. The multi-angle pavement interlayer bond strength testing device as described in claim 1, characterized in that: It also includes a sealing ring (8) for sealing the gap between the loading rod (7) and the detection box (1), the inner sidewall of the sealing ring (8) being fitted onto the portion of the loading rod (7) located outside the detection box (1), and the sealing ring (8) abutting against the outer sidewall of the detection box (1).

3. A multi-angle pavement interlayer bond strength testing device as described in claim 1 or 2, characterized in that: The detection box (1) includes a top plate (11) and a bottom plate (12) parallel to the top plate (11). The first connecting through hole is disposed on the top plate (11). The axis of the loading rod (7) is perpendicular to the plane of the top plate (11). The second cover plate (6) abuts against the top of the bottom plate (12).

4. The multi-angle pavement interlayer bond strength testing device as described in claim 3, characterized in that: The upper test structure includes a first side, a second side opposite to the first side, and a third side connected to the first side and the second side respectively. The lower test structure includes a fourth side, a fifth side opposite to the fourth side, and a sixth side connected to the fourth side and the fifth side respectively. The fourth side is bonded to the first side, and the sixth side is opposite to the third side. The first shearing structure (3) includes a first substrate (31) and a first limiting part (32) connected to one side of the first substrate (31). The second shearing structure (5) includes a second substrate (51) and a second limiting part (52) connected to one side of the second substrate (51). The first substrate (31) abuts against the second side, the first limiting part (32) abuts against the third side, the second substrate (51) abuts against the fifth side, and the second limiting part (52) abuts against the sixth side.

5. The multi-angle pavement interlayer bond strength testing device as described in claim 4, characterized in that: The first shearing structure (3) further includes a first arc-shaped connecting part (33) connected to the side of the first base (31) away from the first limiting part (32). The first cover plate (4) includes a third base (41) and a second arc-shaped connecting part (42) connected to the third base (41). The side of the third base (41) away from the second arc-shaped connecting part (42) is connected to the loading rod (7). The second arc-shaped connecting part (42) can be mortised and tenoned with different positions on the first arc-shaped connecting part (33).

6. The multi-angle pavement interlayer bond strength testing device as described in claim 4, characterized in that: The second shearing structure (5) also includes a third arc-shaped connecting part (53) connected to the side of the second base (51) away from the second limiting part (52). The second cover plate (6) includes a fourth base (61) and a fourth arc-shaped connecting part (62) connected to the fourth base (61). The side of the fourth base (61) away from the fourth arc-shaped connecting part (62) abuts against the bottom plate (12). The fourth arc-shaped connecting part (62) can be mortised and tenoned with different positions on the third arc-shaped connecting part (53).

7. The multi-angle pavement interlayer bond strength testing device as described in claim 6, characterized in that: The fourth substrate (61) has a plurality of rollers (63) on one side that abuts against the base plate (12).

8. The multi-angle pavement interlayer bond strength testing device as described in claim 5, characterized in that: The first arc-shaped connecting part (33) includes a plurality of first connecting saw teeth arranged at equal intervals, and the second arc-shaped connecting part (42) includes at least one first groove. One first groove is mortised and tenoned with one of its corresponding first connecting saw teeth. The central angle of one first connecting saw tooth is 4.5 to 5.5 degrees.

9. The multi-angle pavement interlayer bond strength testing device as described in claim 5, characterized in that: The third base (41) has a first threaded groove (411) on one side away from the second arc-shaped connecting part (42), and the bottom of the loading rod (7) has a first threaded part screwed into the first threaded groove (411).

10. A multi-angle pavement interlayer bond strength testing device as described in claim 1 or 2, characterized in that: The top of the loading rod (7) is provided with a second threaded part, and it also includes a force-applying plate (9) with a cross-sectional area larger than that of the loading rod (7). The force-applying plate (9) is provided with a second threaded groove (91), and the second threaded part is screwed into the second threaded groove (91).

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