A clamping device for on-site testing of inter-layer adhesion of pavement

Abstract

The utility model relates to the technical field of pavement testing, and in particular to a clamping device for on-site testing of interlayer adhesion of pavement, comprising: a connecting component; a clamping component; a pulling bracket; the connecting component comprises a base plate, one end of the base plate is bonded and fixed to the top end face of an upper layer sample of a pavement, the clamping component comprises a plurality of clamping jaws, a connecting block and a connecting rod, the clamping jaws are evenly distributed on the other end face of the base plate, the free ends of the clamping jaws form a clamping effect on the outer axial surface of the base plate and the upper layer sample of the pavement, and a connecting block and a connecting rod are correspondingly arranged on the top of each clamping jaw, one end of each connecting rod is connected to the connecting block, an adapter component is arranged in the pulling bracket, the adapter component is arranged along the vertical direction, and is connected to the other end parts of the plurality of connecting rods; the stability of the connection is ensured, damage is avoided, and the accuracy of the test result is ensured, the clamping component can automatically convert the vertical pulling force into the horizontal clamping force as the pulling force is applied, the operation is simple and convenient, and the practicability is strong.

Description

Technical Field

[0001] The utility model relates to the technical field of road surface testing, in particular to a clamping device for on-site testing of inter-layer adhesion of road surfaces. Background Art

[0002] In road engineering, good interlayer bonding can prevent moisture penetration and reduce interlayer sliding, thereby extending the service life of the pavement. Therefore, testing the interlayer bonding performance of the mixture is crucial to evaluating the durability and bearing capacity of the pavement.

[0003] In the related art, indoor simulated composite specimens are usually used for bonding performance testing. Specimens with different material layers are made, and a pulling bracket is used to bond the pulling head to the pavement material through epoxy resin. Then, a pulling force is applied until the bonding surfaces are separated to measure the bonding strength, thereby determining the bonding performance between different material layers. Although the above method can reflect the performance of the road to a certain extent, during the test, the pulling head may be separated from the original pavement due to weak bonding or uneven force, and if the bonding force is too large, it may cause damage to the specimen itself, thereby failing to accurately reflect the interlayer bonding performance.

[0004] The information disclosed in this background technology section is only intended to deepen the understanding of the overall background technology of the present invention, and should not be regarded as an admission or any form of implication that the information constitutes the prior art known to those skilled in the art. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a clamping device for on-site testing of the adhesion between pavement layers, so as to realize on-site testing of the adhesion between pavement layers, prevent separation from the original pavement and damage to the sample during the test, and ensure the accuracy of the on-site adhesion test results.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a clamping device for on-site testing of interlayer adhesion of pavement, comprising:

[0007] A connecting assembly is arranged on the upper surface of the upper layer sample of the pavement;

[0008] A clamping assembly, used for fixedly connecting the connection assembly and the upper layer sample of the road surface;

[0009] The pulling bracket is used to receive the pulling instrument and apply vertical pulling force to the upper layer sample of the pavement;

[0010] Among them, the connecting component includes a base plate, one end of which is bonded and fixed to the top end surface of the upper layer of the road surface sample, the clamping component includes a plurality of clamping jaws, a connecting block and a connecting rod, the clamping jaws are evenly distributed on the other end surface of the base plate, the free ends of the clamping jaws form a clamping effect on the outer axial surface of the base plate and the upper layer of the road surface sample, and a connecting block and a connecting rod are correspondingly arranged on the top of each of the clamping jaws, one end of each of the connecting rods is connected to the connecting block, and an adapter component is arranged in the pulling bracket, the adapter component is arranged along the vertical direction, and is connected to the other end portions of the plurality of connecting rods.

[0011] Furthermore, the clamp is a fan-shaped structure, including a translation section and a clamping section that are connected to each other. The translation section is arranged along the radial direction of the base plate and is slidingly connected to the top surface of the base plate. The clamping section is arranged along the axial direction of the base plate and approaches or moves away from the outer axial surface of the base plate and the upper layer of the road surface sample.

[0012] Furthermore, the clamping section forms a clamping surface on one side facing the outer axial surface of the base plate, and the clamping surface is provided with a plurality of continuous protrusions, and the protrusions are arranged in contact with the outer axial surfaces of the base plate and the upper layer of the road surface sample.

[0013] Furthermore, the connecting block is fixed to the side of the translation section away from the base plate, located at the end away from the clamping section, and has a threaded hole arranged radially through, and one end of the connecting rod extends into the threaded hole and is threadedly connected to the connecting block.

[0014] Furthermore, the connecting rod includes a first segment and a second segment, the first segment and the second segment are rotatably connected, the outer axial surface of the first segment is provided with a threaded structure, and the first segment is threadedly connected to the connecting block, and the end of the second segment facing away from the first segment is hinged to the adapter assembly.

[0015] Furthermore, the shaft diameter of the second segment is larger than the shaft diameter of the first segment, and the second segment is recessed toward the middle of one end of the first segment to form a transition groove, and the end of the first segment is disposed in the transition groove and is rotatably connected to the second segment via an adapter.

[0016] Furthermore, the connecting assembly also includes a column, one end of which is fixedly connected to the top end surface of the base plate away from the upper road surface sample and is coaxially arranged with the base plate, and the other end of which is located outside the pulling bracket.

[0017] Furthermore, the adapter assembly includes a driving rod and an adapter block, the column is hollowly arranged along the axial direction to form a cavity, the driving rod and the adapter block are arranged in the cavity, and the end of the driving rod is connected to the adapter block, and the end of the multiple connecting rods facing away from the clamp is connected to the adapter block.

[0018] Furthermore, the adapter block is a spherical structure, and a movable cavity is correspondingly arranged on the side facing the connecting rod, and the end of the connecting rod is arranged in the movable cavity and is hinged to the adapter block.

[0019] Furthermore, a plurality of guide grooves are provided on the outer axial surface of the column along the axial direction, and the guide grooves are provided in one-to-one correspondence with the connecting rods, and the connecting rods pass through the corresponding guide grooves and are hinged to the adapter block in the cavity.

[0020] The beneficial effects of the utility model are as follows: the utility model forms a fixing and clamping effect on the connection component and the upper layer sample of the road surface by additionally arranging a clamping component, thereby effectively preventing the connection component and the upper layer sample of the road surface from being separated during the test and ensuring the stability of the connection; and the arrangement of multiple clamps can also ensure that a uniform tensile force is formed on the sample, thereby avoiding damage to the sample due to uneven force and ensuring the accuracy of the test results; at the same time, through the adapter component in the pulling bracket, the clamping component can automatically convert the vertical pulling force into a horizontal clamping force as the pulling force is applied, and the operation is simple and convenient, and the practicability is strong. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 This is a schematic diagram of the internal structure of the clamping device for on-site testing of the adhesion between pavement layers in an embodiment of the utility model;

[0023] Figure 2 It is a top view of the clamping device for on-site testing of the adhesion between pavement layers in the embodiment of the utility model;

[0024] Figure 3 for Figure 2 Sectional view at AA in the middle;

[0025] Figure 4 It is a schematic diagram of the structure of the clamping assembly and the adapter assembly in the embodiment of the utility model;

[0026] Figure 5 for Figure 4 The enlarged view of point A in the middle;

[0027] Figure 6 for Figure 4 The enlarged view of point B in the middle;

[0028] Figure 7 This is a schematic diagram of the structure of the connection assembly in the embodiment of the utility model;

[0029] Figure 8 It is a side view of the connection assembly in the embodiment of the utility model;

[0030] Fig. 9 for Figure 8 Cross-sectional view at the middle BB.

[0031] Figure numerals: 1. pavement upper layer sample; 10. connection assembly; 11. base plate; 12. column; 121. cavity; 122. guide groove; 20. clamping assembly; 21. clamping claw; 211. translation section; 212. clamping section; 212a. clamping surface; 22. connecting block; 221. threaded hole; 23. connecting rod; 231. first section; 232. second section; 232a. adapter groove; 232b. adapter; 30. pulling bracket; 40. adapter assembly; 41. driving rod; 42. adapter block; 42a. movable cavity. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0033] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0035] like Figures 1 to 9The clamping device for on-site testing of the adhesion between pavement layers shown comprises:

[0036] The connecting assembly 10 is arranged on the upper surface of the road surface upper layer sample 1;

[0037] The clamping assembly 20 is used to fix the connecting assembly 10 and the road surface upper layer sample 1;

[0038] The pulling bracket 30 is used to receive the pulling instrument and apply a pulling force in a vertical direction to the upper layer sample 1 of the road surface;

[0039] Among them, the connecting component 10 includes a base plate 11, one end of the base plate 11 is bonded and fixed to the top end surface of the upper layer of the road surface sample 1, the clamping component 20 includes a plurality of jaws 21, a connecting block 22 and a connecting rod 23, the jaws 21 are evenly distributed on the other end surface of the base plate 11, the free ends of the jaws 21 form a clamping effect on the outer axial surface of the base plate 11 and the upper layer of the road surface sample 1, and a connecting block 22 and a connecting rod 23 are correspondingly arranged on the top of each jaw 21, one end of each connecting rod 23 is connected to the connecting block 22, and an adapter component 40 is arranged in the pulling bracket 30, the adapter component 40 is arranged along the vertical direction, and is connected to the other end of the plurality of connecting rods 23.

[0040] The utility model additionally arranges a clamping assembly 20 to fix and clamp the connection assembly 10 and the upper layer sample 1 of the road surface, thereby effectively preventing the connection assembly 10 and the upper layer sample 1 from separating during the test and ensuring the stability of the connection. The arrangement of multiple clamping jaws 21 can also ensure that a uniform tensile force is applied to the sample, thereby avoiding damage to the sample due to uneven force and ensuring the accuracy of the test results. At the same time, through the adapter assembly 40 in the pulling bracket 30, the clamping assembly 20 can automatically convert the vertical pulling force into a horizontal clamping force during the pulling force application process. The operation is simple and convenient, and the utility model is highly practical.

[0041] It should be noted that before conducting on-site testing, it is necessary to use a coring machine to coring the on-site pavement structure to separate the sample area from the original pavement, thereby leaving the space required for the test. Then, the above-mentioned clamping device is set on the surface of the upper pavement sample 1, and the bottom plate 11 is bonded to the surface of the upper pavement sample 1 with epoxy resin. At the same time, multiple jaws 21 in the clamping assembly 20 are inserted laterally into the gap formed after coring, so that the jaws 21 are arranged relative to the outer axial surface of the upper pavement sample 1; under the action of the adapter assembly 40, the clamping assembly 20 can automatically convert the vertical pulling force into a lateral clamping force as the pulling force is applied, and the jaws 21 gather toward the middle to clamp the upper pavement sample 1, and after clamping, as the pulling instrument works, the upper pavement sample 1 is driven to move up in the vertical direction and separate from the lower pavement sample, thereby obtaining the maximum force value through testing, and the bonding performance between the pavement structure layers is characterized through the calculation of the pulling strength to ensure the accuracy of the test results.

[0042] On the basis of the above embodiment, the clamp 21 is a fan-shaped structure. A plurality of fan-shaped clamps 21 can adapt to pavement samples of different sizes, thereby increasing the versatility of the device. The clamp 21 includes a translation section 211 and a clamping section 212 that are connected to each other. The translation section 211 is arranged along the radial direction of the bottom plate 11 and is slidably connected to the top surface of the bottom plate 11. The clamping section 212 is arranged along the axial direction of the bottom plate 11 and approaches or moves away from the outer axial surface of the bottom plate 11 and the upper pavement sample 1. Through the relative movement between the translation section 211 and the bottom plate 11, the clamping section 212 clamps the outer axial surface of the sample. In this embodiment, the number of the clamps 21 is 6, which is not specifically limited here, and it is sufficient to form a stable clamping effect.

[0043] On the basis of the above-mentioned embodiment, a clamping surface 212a is formed on the side of the clamping section 212 facing the outer axial surface of the base plate 11, and the clamping surface 212a is provided with a plurality of continuous protrusions, which are arranged in abutment with the outer axial surfaces of the base plate 11 and the upper pavement sample 1; the presence of the protrusions significantly increases the friction between the clamping surface 212a and the pavement sample, thereby providing a stronger clamping force, helping to prevent the sample from sliding when a pulling force is applied, ensuring the stability of the test, and improving the accuracy and reliability of the test data.

[0044] On the basis of the above embodiment, the connecting block 22 is fixed to the side of the translation section 211 away from the base plate 11, located at the end away from the clamping section 212, and has a threaded hole 221 arranged along the radial direction, and one end of the connecting rod 23 extends into the threaded hole 221 and is screwed to the connecting block 22; through the threaded hole 221 and the screw connection, the connecting rod 23 and the connecting block 22 can be more firmly fixed, thereby improving the stability of the entire clamping device, and the design of the threaded hole 221 allows the length of the connecting rod 23 to be fine-tuned to adapt to pavement samples of different thicknesses or shapes.

[0045] On the basis of the above embodiment, the connecting rod 23 includes a first segment 231 and a second segment 232, the first segment 231 and the second segment 232 are rotatably connected, the outer axial surface of the first segment 231 is provided with a threaded structure, and the first segment 231 is screwed to the connecting block 22, and the end of the second segment 232 away from the first segment 231 is hinged to the adapter assembly 40; the hinged form allows a certain angle of rotation between the connecting rod 23 and the connecting block 22, thereby preventing the pulling instrument from getting stuck when the vertical force is converted into a lateral force, ensuring that the clamping effect can be smoothly formed and extending the service life of the device.

[0046] On the basis of the above embodiment, the axial diameter of the second segment 232 is set larger than the axial diameter of the first segment 231, and the second segment 232 is recessed toward the middle of one end of the first segment 231 to form an adapter groove 232a, providing a suitable placement space for the first segment 231; the end of the first segment 231 is set in the adapter groove 232a, and is rotatably connected to the second segment 232 through the adapter 232b; when the pulling instrument applies a vertical pulling force, the force is transmitted to the second segment 232 through the adapter assembly 40, and further transmitted to the adapter groove 232a, so that a certain angle is formed between the second segment 232 and the adapter assembly 40 and the first segment 231, and the direction of the force changes. After rotating to the extreme position, as the pulling instrument further applies force, the first segment 231 drives the clamping jaw 21 to move laterally, forming a lateral clamping force.

[0047] On the basis of the above embodiment, the connecting assembly 10 also includes a column 12, one end of which is fixedly connected to the top end face of the base plate 11 away from the upper pavement sample 1, and is coaxially arranged with the base plate 11, and the other end is located on the outside of the pulling bracket; the linear transmission of force is ensured, the deflection and loss during the force transmission process are reduced; the stability of the test is improved; it is convenient for quick installation and adjustment, and the efficiency of on-site testing is improved.

[0048] On the basis of the above embodiment, the adapter assembly 40 includes a driving rod 41 and an adapter block 42. The column 12 is hollowly arranged along the axial direction to form a cavity 121. The driving rod 41 and the adapter block 42 are arranged in the cavity 121, and the end of the driving rod 41 is connected to the adapter block 42. The end of a plurality of connecting rods 23 away from the clamping jaw 21 is connected to the adapter block 42; the adapter assembly 40 is arranged in the hollow cavity 121 of the column 12, and the assembly space is compact. When the pulling instrument controls the vertical position of the driving rod 41 to change, a guiding effect of the vertical force is formed through the hollow cavity 121, and the force is stable.

[0049] On the basis of the above embodiment, the adapter block 42 is a spherical structure, and an active cavity 42a is correspondingly arranged on the side facing the connecting rod 23. The end of the connecting rod 23 is arranged in the active cavity 42a and is hinged to the adapter block 42. When the driving rod 41 drives the adapter block 42 to move in the vertical direction, the hinge action between the adapter block 42 and the multiple connecting rods 23 enables the multiple connecting rods 23 to rotate relative to each other in the active cavity 42a at the same time. When rotated to the extreme position, the synchronous clamp 21 is driven to move laterally to form a clamping force on the sample. If the cross-sectional shape of the sample is uneven, the screw connection length between the first segment 231 on the connecting rod 23 and the connecting block 22 can be adjusted to adjust the clamping force.

[0050] On the basis of the above embodiment, a plurality of guide grooves 122 are arranged on the outer axial surface of the column 12 along the axial direction, and the guide grooves 122 are arranged one by one corresponding to the connecting rod 23. The connecting rod 23 passes through the corresponding guide grooves 122 and is hinged to the adapter block 42 in the cavity 121; the guide grooves 122 avoid interference with the position of the connecting rod 23 when the height position of the driving rod 41 changes, and at the same time form a guiding effect when one end of the connecting rod 23 extending into the cavity 121 moves, thereby ensuring the stability of force transmission.

[0051] Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the description are only for explaining the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which are within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A clamping device for on-site testing of interlayer adhesion of pavement, characterized in that: include: A connecting assembly is arranged on the upper surface of the upper layer sample of the pavement; A clamping assembly, used for fixedly connecting the connection assembly and the upper layer sample of the road surface; The pulling bracket is used to receive the pulling instrument and apply vertical pulling force to the upper layer sample of the pavement; Among them, the connecting component includes a base plate, one end of which is bonded and fixed to the top end surface of the upper layer of the road surface sample, the clamping component includes a plurality of clamping jaws, a connecting block and a connecting rod, the clamping jaws are evenly distributed on the other end surface of the base plate, the free ends of the clamping jaws form a clamping effect on the outer axial surface of the base plate and the upper layer of the road surface sample, and a connecting block and a connecting rod are correspondingly arranged on the top of each of the clamping jaws, one end of each of the connecting rods is connected to the connecting block, and an adapter component is arranged in the pulling bracket, the adapter component is arranged along the vertical direction, and is connected to the other end portions of the plurality of connecting rods.

2. The clamping device for on-site testing of interlayer adhesion of pavement according to claim 1 is characterized in that: The clamping jaw is a fan-shaped structure, including a translation section and a clamping section that are connected to each other. The translation section is arranged along the radial direction of the base plate and is slidably connected to the top surface of the base plate. The clamping section is arranged along the axial direction of the base plate and approaches or moves away from the outer axial surface of the base plate and the upper layer of the road surface sample.

3. The clamping device for on-site testing of interlayer adhesion of pavement according to claim 2 is characterized in that: The clamping section forms a clamping surface on one side facing the outer axial surface of the bottom plate. The clamping surface is provided with a plurality of continuous protrusions, and the protrusions are arranged in contact with the outer axial surfaces of the bottom plate and the upper layer of the road surface sample.

4. The clamping device for on-site testing of interlayer adhesion of pavement according to claim 2, characterized in that: The connecting block is fixed to the side of the translation section away from the bottom plate, located at the end away from the clamping section, and has a threaded hole arranged radially through, one end of the connecting rod extends into the threaded hole and is screwed to the connecting block.

5. The clamping device for on-site testing of interlayer adhesion of pavement according to claim 4 is characterized in that: The connecting rod includes a first segment and a second segment, the first segment and the second segment are rotatably connected, the outer axial surface of the first segment is provided with a threaded structure, and the first segment is threadedly connected to the connecting block, and the end of the second segment facing away from the first segment is hinged to the adapter assembly.

6. The clamping device for on-site testing of interlayer adhesion of pavement according to claim 5, characterized in that: The shaft diameter of the second segment is larger than the shaft diameter of the first segment, and the second segment is recessed toward the middle of one end of the first segment to form a transition groove, and the end of the first segment is arranged in the transition groove and is rotatably connected to the second segment through an adapter.

7. The clamping device for on-site testing of interlayer adhesion of pavement according to claim 1, characterized in that: The connection assembly also includes a column, one end of which is fixedly connected to the top end surface of the base plate away from the top surface of the road surface upper layer sample and is coaxially arranged with the base plate, and the other end of which is located outside the pulling bracket.

8. The clamping device for on-site testing of interlayer adhesion of pavement according to claim 7, characterized in that: The adapter assembly includes a driving rod and an adapter block. The column is hollowly arranged along the axial direction to form a cavity. The driving rod and the adapter block are arranged in the cavity, and the end of the driving rod is connected to the adapter block. The ends of the multiple connecting rods facing away from the clamping jaws are connected to the adapter block.

9. The clamping device for on-site testing of interlayer adhesion of pavement according to claim 8, characterized in that: The adapter block is a spherical structure, and a movable cavity is correspondingly arranged on the side facing the connecting rod. The end of the connecting rod is arranged in the movable cavity and is hinged to the adapter block.

10. The clamping device for on-site testing of interlayer adhesion of pavement according to claim 9, characterized in that: The outer axial surface of the column is provided with a plurality of guide grooves along the axial direction, and the guide grooves are provided in one-to-one correspondence with the connecting rods. The connecting rods pass through the corresponding guide grooves and are hinged to the adapter block in the cavity.

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