A road coring system

Abstract

The present application relates to the technical field of pavement coring, in particular to a road coring system, which aims to solve the problem that the coring machine is difficult to keep parallel and stable when coring on uneven pavement. The system comprises a rack, the bottom of which is connected with a chassis, the bottom surface of the chassis is connected with at least three bases, the bottom surface of each base is provided with a roller, the roller comprises a first hub and a second hub, a drilling machine and a motor are further arranged on the rack, the central axis of the drilling machine is perpendicular to the plane where the chassis is located; a positioning member is fixedly connected in the first hub; an adjusting mechanism is arranged on the base, which can control the positioning member to move up and down along the vertical direction of the rack and abut against the road. The combination of the positioning member and the roller makes the system have both mobility and positioning locking ability, reduces manual repeated lifting, and improves the layout efficiency; the adjusting mechanism enables the drilling machine to move and position on the ground and to realize vertical height adjustment when placing and fine-tuning, which is convenient for quick positioning and preliminary leveling.

Description

Technical Field

[0001] This invention relates to the field of road coring technology, and more specifically to a road coring system. Background Technology

[0002] In road engineering inspection, bridge inspection, and municipal infrastructure maintenance, it is often necessary to use core drilling rigs to drill holes in asphalt pavement, cement concrete pavement, or bridge deck pavement to obtain core samples for testing and analysis of strength, thickness, or structural layer condition. During core drilling operations, the drill rod axis must typically be kept substantially perpendicular to the road surface to ensure drilling quality and core sample integrity. For example, patent CN202510173792.0 discloses a rapid core drilling machine for highway construction, which also incorporates a support structure for the core drilling device to facilitate complete core extraction.

[0003] Existing road coring rigs typically use several support feet under the base for leveling. However, in real-world engineering environments, road surfaces are often not perfectly smooth. For example, some roads have cross slopes, longitudinal slopes, or camber structures, and some road surfaces may have potholes, damage, gravel, or irregular protrusions. Under these complex road conditions, traditional rigid support feet can only provide support through simple height adjustments. The contact area between the foot pads and the ground is small, which can easily lead to the support points being suspended or unevenly stressed, thus affecting the overall stability of the rig.

[0004] Furthermore, when performing coring operations on slopes or uneven surfaces, the drilling rig generates significant axial reaction forces and vibrations during drilling. If the support structure does not make sufficient contact with the ground or lacks stability, it can easily lead to slight displacement or tilting of the drilling rig, causing borehole deviation and even affecting the integrity of the core sample and the accuracy of the test results. In some cases, it may also cause the drill bit to jam or reduce equipment stability, affecting construction safety and operational efficiency.

[0005] Therefore, how to effectively level the drilling rig under complex road conditions and improve its stability during core sampling, so that the support structure can better adapt to inclined or uneven ground, thereby ensuring the verticality and stability of the drilling rig during core sampling, has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] The technical problem to be solved by this invention is that when coring on non-planar or damaged road surfaces, it is difficult for the coring machine to maintain perpendicularity and stability to the road surface. This invention provides a road coring system that can support the coring machine on different road surfaces and adjust the angle to achieve leveling, thereby completing the coring.

[0007] This invention provides a road core sampling system, comprising: The frame has a base connected to its bottom, and at least three bases are connected to the bottom surface of the base. Each base has a roller on its bottom surface. The roller includes a first hub and a second hub. The first hub and the second hub are both semi-circular and have the same outer diameter. The frame also has a drill and a motor. The central axis of the drill is perpendicular to the plane of the base. A positioning component, wherein the positioning component is fixedly connected to the inner ring surface of the first wheel hub via a connecting rod; An adjustment mechanism is mounted on the base. The second hub is used to rotate along the first hub to expose the positioning component. The adjustment mechanism can drive the base to move the positioning component up and down along the vertical direction of the frame and abut against the road. Several positioning components are kept in the same plane by the adjustment mechanism.

[0008] In the above technical solution, the combination of positioning components and rollers enables the system to have both mobility and positioning and locking capabilities, reducing repeated manual handling and improving deployment efficiency. The adjustment mechanism allows the drilling rig to move and position on the ground and adjust its vertical height during placement and fine-tuning, facilitating quick positioning and initial leveling.

[0009] Preferably, the outer circumferential surface of the first hub has an annular groove along its outer peripheral wall, the width of the second hub is less than or equal to the width of the annular groove, and the second hub is rotatably connected within the annular groove.

[0010] In the above technical solution, the segmented rotation and relative displacement of the roller are achieved by the nesting of the first and second hubs and the annular groove structure. This is beneficial for changing the contact and support angles by adjusting the relative positions of the first and second hubs on complex terrain, thereby improving grounding adaptability.

[0011] Preferably, the positioning element is in the shape of a wheel.

[0012] In the above technical solution, the wheel-shaped positioning component provides rolling positioning on flat or slightly uneven surfaces, which is beneficial for precise adjustment of position in a certain direction; it is also more beneficial for directional support when moving in a straight line.

[0013] Preferably, the positioning element is spherical.

[0014] In the above technical solution, the spherical positioning component can provide multi-directional contact and adaptive angle support, which is especially suitable for slope or uneven scenarios, enabling the positioning component to automatically fit and bear load in multi-axis directions, and enhancing the contact adaptability between the base and the ground.

[0015] Preferably, a gasket is provided between the base and the roller, the positioning member has a through hole extending through its center along the thickness direction of the roller, and two support rods are fixedly connected to the gasket, with a roller connecting the two support rods.

[0016] In the above technical solution, the arrangement of the shims, support rods, and rollers ensures that the movement of the rollers is restricted by a predetermined guide, thus avoiding free oscillation or misalignment of the rollers.

[0017] Preferably, the top surface of the gasket is provided with a turntable, the bottom surface of the base is provided with a rotating shaft, and the turntable and the rotating shaft are rotatably connected.

[0018] In the above technical solution, on irregular road surfaces, the local support angle can be freely adjusted by the turntable to obtain a larger contact area.

[0019] Preferably, the first hub has an arc of 180° and the second hub has an arc of 200°-250°; the second hub and the first hub are provided with a plurality of insertion holes along their own radial direction and along one side of the annular groove, respectively, the insertion holes being equidistantly distributed along the circumferential direction of the roller, and the insertion holes being detachably connected with pins.

[0020] In the above technical solution, the insertion hole and the pin enable the first and second wheel hubs to achieve segmented locking or stepped positioning within a certain rotation range, which facilitates quick locking or fine adjustment, prevents accidental rotation under lateral force, and thus improves stability.

[0021] Preferably, a baffle is fixedly connected to the side of the annular groove facing outward. The radius of the baffle is smaller than the radius of the second hub. The baffle is also provided with a plurality of insertion holes at equal intervals along the circumferential direction of the first hub. The insertion holes on the first hub, the second hub and the baffle correspond one-to-one.

[0022] In the above technical solution, the flange acts as a physical stop to improve the radial positioning reliability of the second hub in the annular groove and prevent it from falling off or becoming misaligned.

[0023] Preferably, both ends of the second wheel hub are detachably connected to support seats, and the end of the support seat away from the second wheel hub is an arc surface.

[0024] In the above technical solution, the detachable design of the support seat facilitates on-site replacement or maintenance, and the contact between the curved surface and the ground is more adaptable to curved or arc-shaped bases, such as road arches and bridge arches, thereby improving fit and uniform stress distribution.

[0025] Preferably, the radius of the positioning element is greater than the distance between the center of the second hub and the two end faces of the opening of the second hub.

[0026] In the above technical solution, by limiting the geometric relationship between the radius of the positioning component and the second wheel hub, it is ensured that the positioning component can extend beyond the opening line when in contact with the road surface, thereby improving contact stability and preventing the positioning component from slipping or displacing relative to the ground under stress.

[0027] Preferably, the first and second wheel hubs are made of steel, and the support base and the positioning element are made of one or a combination of rubber, polyurethane, and nylon.

[0028] In the above technical solution, the steel wheel hub provides structural rigidity and load-bearing strength, ensuring the durability and strength requirements of the main force transmission components; elastic high-friction materials such as rubber, polyurethane, and nylon, as contact components, can improve the friction with the road surface, buffer vibration, and reduce local damage to the road surface, thereby protecting the road surface and improving anti-skid performance.

[0029] Preferably, the adjustment mechanism includes a column and a screw rotatably connected inside the column. The column is fixedly connected to the base frame. A guide sleeve is fixedly connected to the screw. Guide blocks are fixedly connected to both sides of the guide sleeve. A groove is provided inside the base. Limiting grooves are provided on both sides of the groove. The guide sleeve is rotatably connected inside the groove. The guide blocks are slidably connected inside the limiting grooves.

[0030] In the above technical solution, the screw and guide block can achieve fine-tuning of height and withstand the axial reaction force during drilling.

[0031] Preferably, a buffer spring is connected between the top surface of the column and the base, and a plurality of support seats are provided on the bottom surface of the base frame.

[0032] In the above technical solution, the buffer spring provides elastic buffer between the adjustment mechanism and the base, which can absorb the impact and vibration generated during drilling, reduce the vibration transmitted to the frame, protect the transmission components, and help maintain the stability of the drill bit.

[0033] Compared with the prior art, the present invention has the following advantages and beneficial effects: 1. The roller in this invention can be divided into a first hub, a second hub, and a positioning component. The height of the roller can be adjusted by the adjustment mechanism, so that the core sampling system can achieve good fit, leveling and positioning on complex road surfaces such as slopes, road cambers, and potholes. 2. In this invention, the second hub and positioning component can adaptively adjust the positioning angle according to different road conditions, and cooperate with the buffer spring and other structures to form a mechanism system that can be finely adjusted and reliably locked, effectively resisting the axial reaction force and lateral disturbance during drilling, and reducing drilling deviation and core sample damage. Attached Figure Description

[0034] The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and form part of this application, do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 2 ; Figure 3 for Figure 2 A magnified view of a section at point A in the middle; Figure 4 This is an exploded view of the roller, gasket, and base in this invention; Figure 5 This is a schematic diagram of the structure of the first and second hubs combined to form a roller in this invention; Figure 6 This is a schematic diagram of the structure of the second hub after it is rotated into the annular groove in this invention; Figure 7 This is a schematic diagram of the structure of the second hub support seat in Embodiment 3 of the present invention when it is used as a support; Figure 8 This is an exploded view of the first and second wheel hubs in this invention.

[0035] The attached diagram shows the markings and corresponding component names: 1. Frame; 11. Base frame; 12. Base; 13. Drilling rig; 14. Column; 2. Roller; 21. First hub; 211. Annular groove; 212. Edge retainer; 22. Second hub; 221. Support seat; 23. Insertion hole; 24. Positioning component; 241. Connecting rod; 3. Gasket; 31. Support rod; 4. Screw; 5. Guide sleeve; 6. Buffer spring. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments and accompanying drawings. The illustrative embodiments and descriptions of this invention are for illustrative purposes only and are not intended to limit the invention. It should be noted that this invention is already in the actual research and development stage.

[0037] Example 1: like Figures 1 to 6 As shown, this embodiment provides a road core sampling system, including: The frame 1 has a base frame 11 connected to its bottom. At least three bases 12 are connected to the bottom surface of the base frame 11. Each base 12 has a roller 2 on its bottom surface. The roller 2 includes a first hub 21 and a second hub 22. Both the first hub 21 and the second hub 22 have a semi-annular structure and the same outer diameter. The frame 1 is also equipped with a drill rig 13 and a motor. The central axis of the drill rig 13 is perpendicular to the plane on which the base frame 11 is located. Positioning component 24 is fixedly connected to the inner ring surface of the first hub 21 via connecting rod 241; An adjustment mechanism is mounted on the base 12. The second hub 22 is used to rotate along the first hub 21 to expose the positioning member 24. The adjustment mechanism can drive the positioning member 24 to move up and down along the vertical direction of the frame 1 and abut against the road through the drive base 12. Several positioning members 24 are kept in the same plane through the adjustment mechanism.

[0038] like Figures 1 to 6 ,and Figure 8 As shown, the outer ring surface of the first hub 21 has an annular groove 211 along its outer peripheral wall, and the width of the second hub 22 is less than or equal to the groove width of the annular groove 211. The second hub 22 is used to rotatably connect to the annular groove 211.

[0039] like Figures 1 to 6 As shown, the positioning element 24 is either wheel-shaped or spherical.

[0040] like Figure 4 As shown, a gasket 3 is provided between the base 12 and the roller 2. The positioning member 24 has a through hole along its own center according to the thickness direction of the roller 2. Two support rods 31 are fixedly connected to the gasket 3. The two support rods 31 are connected to rollers along the roller 2 and the through hole.

[0041] like Figures 4 to 6 ,and Figure 8 As shown, the second hub 22 is provided with several insertion holes 23 along its own radial direction and the first hub 21 is provided with several insertion holes 23 along one side of the annular groove 211. The insertion holes 23 are equidistantly distributed along the circumferential direction of the roller 2, and the insertion holes 23 are detachably connected with pins.

[0042] like Figures 1 to 3 As shown, the adjustment mechanism includes a column 14 and a screw 4 rotatably connected in the column 14. The column 14 is fixedly connected to the base frame 11. A guide sleeve 5 is fixedly connected to the screw 4. Guide blocks are fixedly connected to both sides of the guide sleeve 5. A groove is opened in the base 12. Limit grooves are opened on both sides of the groove. The guide sleeve 5 is rotatably connected in the groove, and the guide blocks are slidably connected in the limit grooves.

[0043] Specifically, in this embodiment, the frame 1 and the base frame 11 are perpendicular to each other, the base frame 11 is parallel to the horizontal plane, the base 12 is connected to the column 14 by the screw 4, and the first hub 21 and the second hub 22 can form a roller 2 by the connection and cooperation of the pin and the insertion hole 23, which rolls along the roller shaft, thereby driving the frame 1 to move.

[0044] Regarding the leveling method of the coring system: On flat or sloping roads, the coring system is no different from existing technologies. After confirming the coring location, the fixed frame 1 can start the motor and the drill 13 to excavate the road surface for coring. Since the central axis of the drill 13 is perpendicular to the plane of the base frame 11, and the base frame 11 is parallel to the horizontal plane, the drill 13 can directly excavate the road surface to obtain the sample.

[0045] When the road surface is arched and not flat, after surveying and measuring the location where the core is to be taken, the core taking system is moved to that location, and the pin on one of the rollers 2 is removed, so that the first hub 21 and the second hub 22 are unconstrained. It should be noted that the roller 2 can be manually adjusted and rotated, and the opening of the first hub 21 must be kept facing directly below the base frame 11. Then, the second hub 22 is moved along the annular groove 211 so that the second hub 22 and the first hub 21 are on the same side, exposing the positioning member 24, and the pin is inserted into the insertion hole 23 of the first hub 21 and the second hub 22 again to achieve temporary constraint.

[0046] Next, adjust the screw 4 at the positioning component 24. Rotate the screw 4 along the column 14. The screw 4 drives the guide sleeve 5 and the guide block to rotate synchronously. The guide sleeve 5 and the guide block rotate in the groove and the limiting groove respectively, and rise or fall according to the different rotation direction of the screw 4, thereby driving the base 12 to rise or fall. Preferably, there are four rollers 2 in this embodiment. When positioning and leveling the arched road surface, apply force to the frame 1 towards the arched road surface. The roller 2 that tilts upward is selected as the first roller 2 to be adjusted. After the positioning component 24 is exposed in the above manner, the screw 4 can be manually adjusted with the help of tools to move the base 12 down until the positioning component 24 touches the arched road surface, which means that the roller 2 has been adjusted.

[0047] Preferably, in this embodiment, the four rollers 2 are distributed along the four vertices of the rectangle. After the positioning arrangement of the rollers 2 is completed, the roller 2 and the other roller 2 on its diagonal are fixed. The two rollers 2 on the other diagonal can continue to be adjusted in the same manner. When the positioning parts 24 of three rollers 2 are in contact with the road surface, the positioning parts 24 that need to be adjusted later are all based on the first positioning part 24, ensuring that the positioning parts 24 in the four rollers 2 can be in the same plane. Furthermore, in order to ensure good stability, the positioning part 24 of the last roller 2 can also be exposed and in contact with the road surface. The positioning part 24 and the rough road surface will form static friction, which improves the stability of the frame 1 and can maintain stability when the drilling rig 13 drills the core.

[0048] After core removal is completed, restore the positions of roller 2 and base 12.

[0049] Example 2: like Figure 4As shown, a turntable is provided on the top surface of the gasket 3, and a rotating shaft is provided on the bottom surface of the base 12. The turntable and the rotating shaft are rotatably connected.

[0050] like Figures 4 to 6 As shown, a baffle 212 is fixedly connected to the side of the annular groove 211 facing the outside. The radius of the baffle 212 is smaller than the radius of the second hub 22. The baffle 212 is also provided with a number of insertion holes 23 at equal intervals along the circumferential direction of the first hub 21. The insertion holes on the first hub 21, the second hub 22 and the baffle 212 correspond one-to-one.

[0051] Specifically, a turntable is provided on the top surface of the pad 3, and a rotating shaft is provided on the bottom surface of the base 12. The turntable and the rotating shaft are rotatably connected, which can ensure that the roller 2 rotates normally while changing the orientation of the roller 2 with the movement of the frame 1, allowing for flexible movement.

[0052] A retaining edge 212 is fixedly connected to one side of the annular groove 211. The height of the retaining edge 212 is less than the thickness of the second hub 22. The retaining edge 212 can be used to restrict the second hub 22 when the roller 2 rotates or when the roller 2 is disassembled and assembled, so as to prevent the second hub 22 from slipping off and falling off.

[0053] Example 3: like Figures 4 to 8 As shown, the first hub 21 has an arc of 180°, and the second hub 22 has an arc of 200°-250°. like Figures 4 to 8 As shown, both ends of the second hub 22 are detachably connected to support seats 221, and the end of the support seat 221 away from the second hub 22 is an arc surface.

[0054] like Figure 6 and 7 As shown, the radius of the positioning element 24 is greater than the distance between the center of the second hub 22 and the two end faces of the opening of the second hub 22.

[0055] The first hub 21 and the second hub 22 are made of steel, and the support seat 221 and the positioning element 24 are made of one or a combination of rubber, polyurethane and nylon materials.

[0056] Specifically, the first hub 21 has an arc of 180° and is semi-circular; the second hub 22 has an arc of 200°-250°, which is greater than the arc length of the first hub 21, and is detachably connected to support seats 221 at both ends. When the second hub 22 is positioned later, it is fixed by the support seats 221 at both ends, so that when it forms a roller 2 with the first hub 21, the rolling surface will not be easily worn.

[0057] In the core sampling method based on Embodiment 1, there are also cases where the road surface is uneven, such as a damaged road surface, requiring core sampling to test the road surface strength. The positioning and leveling method for this type of road surface is basically the same as in Embodiment 1. After the positioning element 24 in the raised roller 2 contacts the road surface, such as... Figure 7 As shown, instead of immediately limiting the first hub 21 and the second hub 22, one end of the second hub 22 is rotated out along the annular groove 211 and inserted into the road surface, thereby achieving bidirectional fixation of the positioning component 24 and the second hub 22; both the support base 221 and the positioning component 24 are made of wear-resistant and flexible materials.

[0058] The radius of the positioning component 24 is greater than the distance between the center of the second hub 22 and the two ends of the opening of the second hub 22. After the roller 2 is disassembled, the positioning component 24 first contacts the ground for initial positioning, and then the second hub 22 rotates out for secondary fixation. The end of the second hub 22 should preferably be inserted into the ditch or groove of the road surface around the positioning component 24. The two ends of the second hub 22 can be adjusted along the annular groove 211, and the end closer to the ditch or groove can be rotated out and inserted. In embodiment 2, the roller 2 can be rotated using a turntable and a rotating shaft to adjust the orientation of the roller 2. Therefore, if the second hub 22 cannot be effectively inserted into a ditch or groove on one side, the shim 3 can be rotated to adjust the orientation of the roller 2 and change the position of the second hub 22. If there is no ditch or groove around the positioning member 24 that can be inserted, one end of the second hub 22 can be directly pressed against the road surface. The straight line formed by the end of the second hub 22 and the positioning member 24 through the connecting rod 241 and the first hub 21, as well as the position where the second hub 22 presses against the ground and the positioning member 24, form a triangular stable fixation, further improving the stability of the single-point fixation.

[0059] Finally, in conjunction with the above method and Example 1, continue to adjust the other rollers 2 to complete the fixing and positioning of the frame 1, use the drilling rig 13 to complete the core extraction, and restore the rollers 2 and the base 12 after the core extraction is completed.

[0060] Example 4: like Figure 2 and Figure 3 As shown, a buffer spring 6 is connected between the top surfaces of the base frame 11 and the base 12, and several support seats 221 are provided on the bottom surface of the base frame 11.

[0061] Specifically, the support base is rod-shaped, and the top end of the support base 221 is rotatably connected to the bottom surface of the base frame 11 through a hinge. A circular platform is fixedly connected to the end of the support base away from the hinge. The platform is made of rubber. The support base and the platform are used for auxiliary fixation. The support base itself is telescopic, so that after the positioning member 24 is adjusted to different heights, it can flexibly extend and retract to support the platform on the ground. After the positioning and fixation are completed in Embodiment 1 or Embodiment 3, the support base 221 can be rotated out to support the platform on the ground.

[0062] When the drilling rig 13 is core-taking, it will generate vibration. The buffer spring 6 can absorb a certain amount of vibration and reduce the impact on the positioning component 24. The positioning component 24 can preferably be spherical. Even if the vibration is transmitted, the spherical structure will always have a point in contact with the ground. Multiple synchronously positioned positioning components 24 can further improve the positioning stability. When the support seat 221 at the end of the second hub 22 touches the ground, it can work with the positioning component 24 to absorb vibration and buffer, thereby improving the overall stability of the core-taking system.

[0063] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A road core sampling system, characterized in that, include: A frame (1) is provided with a base frame (11) at its bottom. At least three bases (12) are connected to the bottom surface of the base frame (11). Each base (12) is provided with a roller (2) on its bottom surface. The roller (2) includes a first hub (21) and a second hub (22). The first hub (21) and the second hub (22) are both semi-circular structures with equal outer diameters. A drilling rig (13) and a motor are also provided on the frame (1). The central axis of the drilling rig (13) is perpendicular to the plane on which the base frame (11) is located. Positioning component (24), which is fixedly connected to the inner ring surface of the first hub (21) via connecting rod (241); An adjustment mechanism is provided on the base (12); The second hub (22) is used to rotate along the first hub (21) to expose the positioning member (24). The adjustment mechanism can drive the base (12) to move the positioning member (24) up and down along the vertical direction of the frame (1) and abut against the road. Several positioning members (24) are kept in the same plane by the adjustment mechanism.

2. The road coring system according to claim 1, characterized in that, The outer ring surface of the first hub (21) is provided with an annular groove (211) along its outer peripheral wall. The width of the second hub (22) is less than or equal to the groove width of the annular groove (211). The second hub (22) is used to rotatably connect to the annular groove (211).

3. A road coring system according to claim 2, characterized in that, The positioning element (24) is in the shape of a wheel.

4. A road coring system according to claim 2, characterized in that, The positioning element (24) is spherical.

5. A road coring system according to claim 2, characterized in that, A gasket (3) is provided between the base (12) and the roller (2). The positioning member (24) has a through hole along its own center according to the thickness direction of the roller (2). Two support rods (31) are fixedly connected to the gasket (3), and a roller is connected between the two support rods.

6. A road coring system according to claim 5, characterized in that, The top surface of the gasket (3) is provided with a turntable, and the bottom surface of the base (12) is provided with a rotating shaft. The turntable and the rotating shaft are rotatably connected.

7. A road coring system according to claim 3 or 4, characterized in that, The first hub (21) has an arc of 180°, and the second hub (22) has an arc of 200°-250°; The second hub (22) has several insertion holes (23) along its own radial direction and the first hub (21) has several insertion holes (23) along one side of the annular groove (211). The insertion holes (23) are evenly distributed along the circumferential direction of the roller (2), and the insertion holes (23) are detachably connected with pins.

8. A road coring system according to claim 7, characterized in that, A retaining edge (212) is fixedly connected to the side of the annular groove (211) facing the outside. The radius of the retaining edge (212) is smaller than the radius of the second hub (22). The retaining edge (212) is also provided with a number of insertion holes (23) at equal intervals along the circumferential direction of the first hub (21). The insertion holes on the first hub (21), the second hub (22) and the retaining edge (212) correspond one-to-one.

9. A road coring system according to claim 2, characterized in that, Both ends of the second hub (22) are detachably connected to support seats (221), and the end of the support seat (221) away from the second hub (22) is an arc surface.

10. A road coring system according to claim 7, characterized in that, The radius of the positioning element (24) is greater than the distance between the center of the second hub (22) and the two ends of the opening of the second hub (22).

11. A road coring system according to claim 9, characterized in that, The first hub (21) and the second hub (22) are made of steel, and the support seat (221) and the positioning element (24) are made of one or a combination of rubber, polyurethane and nylon.

12. A road coring system according to claim 2, characterized in that, The adjustment mechanism includes a column (14) and a screw (4) rotatably connected in the column (14). The column (14) is fixedly connected to the base frame (11). A guide sleeve (5) is fixedly connected to the screw (4). Guide blocks are fixedly connected to both sides of the guide sleeve (5). A groove is provided in the base (12). Limiting grooves are provided on both sides of the groove. The guide sleeve (5) is rotatably connected in the groove. The guide blocks are slidably connected in the limiting grooves.

13. A road coring system according to claim 12, characterized in that, A buffer spring (6) is connected between the top surface of the base frame (11) and the base (12), and a number of support seats (221) are provided on the bottom surface of the base frame (11).

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