Asphalt pavement core drilling device and pavement coring method

Abstract

The present invention discloses an asphalt pavement core drilling device and a pavement core sampling method, which relate to the field of highway inspection technology. The asphalt pavement core drilling device includes an outer drill barrel and an inner drill barrel, wherein the inner drill barrel can be rotatably connected to the inner side of the outer drill barrel; a drill bit, which is fixed to the lower end of the outer drill barrel; a cross-cutting cutter head, which is arranged on the inner side of the drill bit and is used to cut the lower end of the pavement core; and a ratchet transmission assembly, which is arranged at the upper end of the outer drill barrel, so that the outer drill barrel and the inner drill barrel rotate in the same direction or rotate the outer drill barrel in the opposite direction and keep the inner drill barrel stationary. The ratchet transmission assembly controls the outer drill barrel to rotate in the opposite direction and keeps the inner drill barrel stationary, so that the cross-cutting cutter head forms a cutting line on the outer peripheral surface of the pavement core, thereby assisting in twisting off the lower end of the pavement core and making the cross section as close to the cutting line as possible to ensure the integrity of the pavement core after sampling.

Description

Technical Field

[0001] The present invention relates to the technical field of highway detection, in particular to an asphalt pavement core drilling device and a pavement coring method. Background Art

[0002] The pavement coring machine is one of the most widely used inspection equipment in road engineering inspection. It is mainly used to detect parameters such as the thickness and strength of the pavement structure layer. The main component of the pavement coring machine is the drill rod. By rotating the drill rod, the end of the drill rod is extended into the concrete layer, and the concrete layer is cut and sampled. In this process, cold water needs to be poured into the drill rod to cool the drill bit. On the basis of the above, after the drilling is completed, the sample core may be separated from the drill rod, that is, after the drill rod leaves the concrete layer, the sample core remains in the drill hole. Therefore, the operator needs to use additional equipment to remove the sample core later. This process is relatively cumbersome.

[0003] The Chinese patent publication number CN116358919A discloses a road coring machine and method for highway inspection. The invention extends the clamping part of the clamping member into the gap between the sample core and the concrete layer, then rotates the locking rod to clamp the sample core and lifts the casing to remove the sample core.

[0004] However, current coring machines are often unable to cut off the road core, and usually need to increase the length of the drill tube to penetrate the road surface material. This coring method significantly increases the equipment load and operation difficulty. Some methods that rely on workers to use crowbars to break the core often result in uneven cross-sections of the core samples and poor integrity. Summary of the Invention

[0005] In view of the deficiencies in the prior art, the present invention provides an asphalt pavement core drilling device and a pavement coring method, which solve the problems raised in the background art.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: an asphalt pavement core drilling device, including an outer drill barrel and an inner drill barrel, the inner drill barrel can be rotatably connected to the inner side of the outer drill barrel; a drill bit, the drill bit is fixed to the lower end of the outer drill barrel; a cross-cutting cutter head, the cross-cutting cutter head is arranged on the inner side of the drill bit, and is used to cut the lower end of the pavement core; a ratchet transmission assembly, the ratchet transmission assembly is arranged at the upper end of the outer drill barrel, so that the outer drill barrel and the inner drill barrel rotate at the same speed in the forward direction or the outer drill barrel rotates in the opposite direction and keeps the inner drill barrel stationary; wherein, the outer drill barrel rotates in the opposite direction and keeps the inner drill barrel stationary, so that the cross-cutting cutter head moves radially toward the center of the outer drill barrel to form a cutting line on the outer peripheral surface of the pavement core.

[0007] Furthermore, the ratchet transmission assembly includes a hollow tube, which is arranged at the top end of the inner drill barrel and is fixedly connected to the inner drill barrel; a first ratchet, which is fixed to the top end of the outer drill barrel, and a first pawl member adapted to the first ratchet is fixed on the outside of the hollow tube; a second ratchet, which is fixed above the first ratchet, and the second ratchet remains stationary with the road surface in a circumferential direction, and a second pawl member adapted to the second ratchet is fixed on the outside of the hollow tube; wherein, when the outer drill barrel rotates forward, the first ratchet drives the first pawl member to rotate, and at the same time, the second pawl member can rotate relative to the second ratchet, so that the outer drill barrel and the inner drill barrel rotate in the same direction and at the same speed, and when the outer drill barrel rotates reversely, the first ratchet can rotate relative to the first pawl member, and at the same time, the second pawl member is locked by the second ratchet, so that the outer drill barrel rotates reversely and keeps the inner drill barrel stationary.

[0008] Furthermore, the drill bit is rotatably connected to the inner drill barrel, and a transmission compartment is provided between the inner side of the drill bit and the inner drill barrel, and an incomplete gear is fixed to the lower end of the outer side of the inner drill barrel; a notch is provided on the inner side of the drill bit, and a rotating shaft fixedly connected to the cross-cutting cutter head is rotatably installed in the notch, the upper end of the rotating shaft extends into the transmission compartment and is installed with a driven gear meshing with the incomplete gear, and a torsion spring is provided on the outer side of the rotating shaft, one end of the torsion spring is fixedly connected to the rotating shaft, and the other end of the torsion spring is fixed to the side wall of the notch, so that the cross-cutting cutter head is reset when the incomplete gear and the driven gear are not meshed; a limiting beak is provided on one side of the notch, and the teeth on the incomplete gear are meshed with the driven gear, so that when the driven gear rotates to the maximum angle, one side of the cross-cutting cutter head is against the limiting beak.

[0009] Furthermore, it also includes a mobile carrier; a first supporting plate, the first supporting plate is arranged on the mobile carrier, and the first supporting plate can move in the vertical direction; a second supporting plate, the second supporting plate is fixed below the first supporting plate, and a shaft sleeve is rotatably installed on the second supporting plate, and the lower end of the shaft sleeve is fixedly connected to the outer drill barrel; a temporary water storage box, the temporary water storage box is fixed above the second supporting plate, and the lower surface of the temporary water storage box is fixedly connected to the second ratchet; the upper end of the hollow tube extends into the temporary water storage box, and the temporary water storage box is rotatably connected to the hollow tube.

[0010] Furthermore, it also includes a push rod, which is arranged on the inner side of the hollow tube and is axially slidably connected to the hollow tube; a pressure plate, the push rod is rotatably connected to the temporary water storage box, and the upper end of the push rod passes through the temporary water storage box and is equipped with a handle, and the lower end of the push rod is rotatably equipped with a pressure plate, and the pressure plate is slidably connected to the inner wall of the inner drill tube.

[0011] Furthermore, the lower end of the hollow tube extends to the inner drill barrel and is provided with a nozzle, and the gap between the push rod and the hollow tube is used to transport the coolant in the temporary water storage box to the nozzle.

[0012] Furthermore, a driving wheel is rotatably mounted on the first bearing plate, a driven wheel is mounted on the fixed sleeve outside the shaft sleeve, a transmission belt is provided between the driven wheel and the driving wheel, and a motor for driving the driving wheel to rotate is mounted on the first bearing plate.

[0013] Furthermore, guide columns slidably connected to the first supporting plate are fixed on both sides of the movable carrier, and a screw rod is rotatably connected to the movable carrier, and a threaded sleeve threadedly connected to the screw rod is fixed between the first supporting plate and the second supporting plate.

[0014] Furthermore, a splash-proof assembly is provided on the mobile carrier, and the splash-proof assembly includes a splash-proof ring fixed on the mobile carrier, the splash-proof ring is colinear with the axis of the outer drill barrel, and the inner diameter of the splash-proof ring is larger than the maximum outer diameter of the drill bit, and a flexible gasket is provided at the bottom of the splash-proof ring to abut against the ground, and hollow side brackets are provided on both sides of the splash-proof ring, and an isolation net is installed on the inner side of the splash-proof ring at the position of the side bracket.

[0015] The present invention also provides a method for coring an asphalt pavement, comprising the following steps:

[0016] Step 1: Move the mobile carrier to the designated location and fix it;

[0017] Step 2: Lower the first supporting plate and drive the outer drill barrel to rotate forward by the motor, so that the outer drill barrel, the drill bit and the inner drill barrel rotate synchronously, and the coolant in the temporary water storage box is input into the inner drill barrel through the hollow tube and the nozzle;

[0018] Step 3: Connect an external water extraction pipe to extract the wastewater in the side bracket;

[0019] Step 4: After the drill bit reaches the specified depth, the motor drives the outer drill barrel to rotate in the opposite direction, so that the crosscutting cutter head moves radially toward the center of the outer drill barrel to form a cutting line on the outer peripheral surface of the road surface core;

[0020] Step 5: The outer drill tube is driven by the motor to rotate forward again, and pressure is applied to the pavement core through the pressure plate to twist and break the pavement core along the cutting line;

[0021] Step 6: Manually rotate the push rod to rotate the inner drill tube through the hollow tube, so that the crosscutting cutter head moves radially toward the center of the outer drill tube to support the bottom of the road surface core;

[0022] Step 7: Lift the first bearing plate until the outer drill tube is completely raised to the ground, and manually rotate the jack until the road surface core falls from the inner drill tube.

[0023] The present invention has the following beneficial effects:

[0024] (1) The asphalt pavement core drilling device and the pavement core sampling method control the outer drill tube to rotate in the opposite direction and keep the inner drill tube stationary through the ratchet transmission assembly, so that the cross-cutting cutter head forms a cutting line on the outer peripheral surface of the pavement core, thereby assisting in twisting off the lower end of the pavement core and making the cross section as close to the cutting line as possible to ensure the integrity of the pavement core after sampling.

[0025] (2) The asphalt pavement core drilling device and the pavement coring method, after the pavement core is cut off, the cross-cutting cutter head moves radially toward the center of the outer drill barrel to support the bottom of the pavement core, thereby facilitating the collection of the pavement core after lifting. In combination with the setting of the push rod and the pressure plate, the pavement core inside the inner drill barrel can be quickly collected, reducing the difficulty of equipment operation.

[0026] (3) In the asphalt pavement core drilling device and the pavement core sampling method, when the teeth on the incomplete gear are not engaged with the driven gear, the elastic potential energy of the torsion spring is released to drive the rotating shaft to rotate, thereby driving the cross-cutting head to retract into the inside of the slot, so that each cross-cutting head is in intermittent contact with the pavement core, which is conducive to the rest of the cross-cutting head and then extends the service life of the cross-cutting head.

[0027] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of the present invention;

[0029] Figure 2 For the present invention Figure 1 Another perspective of the picture;

[0030] Figure 3 This is a schematic diagram of the installation structure of the temporary water storage box in the present invention;

[0031] Figure 4 Schematic diagram of the internal structure of the inner drill barrel in the present invention;

[0032] Figure 5 Schematic diagram of the driving structure of the drill bit in the present invention;

[0033] Figure 6 Schematic diagram of the installation structure of the pressure plate of the present invention;

[0034] Figure 7 Schematic diagram of the installation structure of the hollow tube in the present invention;

[0035] Figure 8 For the present invention Figure 7 Another perspective of the picture;

[0036] Figure 9 Schematic diagram of the internal structure of the hollow tube in the present invention;

[0037] Figure 10 Schematic diagram of the transmission structure between the ring gear and the driven gear in the present invention;

[0038] Figure 11 For the present invention Figure 10 A top view of

[0039] Figure 12 Schematic diagram of the installation structure of the cross-cutting cutter head in the present invention;

[0040] Figure 13 Schematic diagram of the installation structure of the first ratchet and the second ratchet in the present invention;

[0041] Figure 14 Schematic diagram of the structure of the second pawl member in the present invention;

[0042] Figure 15 It is a schematic structural diagram of the splash-proof component in the present invention.

[0043] In the figure, 1. mobile carrier; 2. guide column; 3. top plate; 4. first bearing plate; 5. screw; 6. driving remote rod; 7. second bearing plate; 8. temporary water storage box; 9. outer drill tube; 10. connecting collar; 11. drill bit; 12. splash-proof assembly; 1201. splash-proof ring; 1202. flexible gasket; 1203. side bracket; 1204. isolation net; 13. motor; 14. top rod; 15. compression spring; 16. road surface core; 17. water tank; 18. water pump; 19. water pipe; 20. driven wheel; 21. transmission belt ; 22. Driving wheel; 23. Threaded sleeve; 24. Inner drill tube; 25. Pressure plate; 26. Hollow tube; 27. First ratchet; 28. Second ratchet; 29. ​​Incomplete gear; 30. Transmission compartment; 31. Driven gear; 32. Sprinkler; 33. Bushing; 34. First pawl; 35. Second pawl; 3501. Wheel; 3502. Fixed pile; 3503. Pawl; 3504. Return spring; 36. Limit beak; 37. Notch; 38. Cross-cutting head; 39. Rotating shaft; 40. Torsion spring; 41. Mounting slot. DETAILED DESCRIPTION

[0044] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0045] In the description of the present invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inside", "around" and the like indicating orientation or positional relationship are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0046] The following is based on Figures 1-15 An asphalt pavement core drilling device and a pavement coring method provided in an embodiment of the present invention are described.

[0047] See also Figures 1-15 , an embodiment of the present invention provides a technical solution: an asphalt pavement core drilling device, comprising an outer drill barrel 9, preferably a spiral groove is provided on the outer surface of the outer drill barrel 9, the spiral direction of the spiral groove is opposite to the rotation direction of the outer drill barrel 9 when drilling downward, so that during the core drilling process, the outer drill barrel 9 rotates so that the generated debris, mud and water are pushed out of the borehole by the spiral groove, reducing the impact of the debris and mud and water on the pavement core 16. The asphalt pavement core drilling device provided by this embodiment also includes an inner drill barrel 24, a drill bit 11, and a cross-cutting cutter head 38. The inner drill barrel 24 can be rotatably connected to the inner side of the outer drill barrel 9, and the length of the inner drill barrel 24 is smaller than the length of the outer drill barrel 9. The drill bit 11 is fixed to the lower end of the outer drill barrel 9. A connecting ring 10 is further provided between the drill bit 11 and the outer drill barrel 9. Preferably, the connecting ring 10 is connected to the drill bit 11 and the outer drill barrel 9 by bolts to facilitate the fixation of the drill bit 11. The cross-cutting cutter head 38 provided in this embodiment is provided on the inner side of the drill bit 11 for cutting the lower end of the pavement core 16.

[0048] The asphalt pavement core drilling device provided in this embodiment also includes a ratchet transmission assembly, which is arranged at the upper end of the outer drill barrel 9, so that the outer drill barrel 9 and the inner drill barrel 24 rotate in the same direction at the same speed or the outer drill barrel 9 rotates in the opposite direction and keeps the inner drill barrel 24 stationary, wherein the outer drill barrel 9 rotates in the opposite direction and keeps the inner drill barrel 24 stationary, so that the cross-cutting cutter head 38 moves radially toward the center of the outer drill barrel 9 to form a cutting line on the outer peripheral surface of the pavement core 16, thereby assisting in the twisting off of the lower end of the pavement core 16, so that the cross section is as close to the cutting line as possible to ensure the integrity of the pavement core 16 after sampling.

[0049] like Figure 4 、 Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 、 Figure 13 and Figure 14 As shown, the ratchet transmission assembly provided in this embodiment includes a hollow tube 26, which is arranged at the top end of the inner drill barrel 24 and is fixedly connected to the inner drill barrel 24 so that the hollow tube 26 drives the inner drill barrel 24 to rotate.

[0050] In order to realize the transmission between the outer drill tube 9 and the inner drill tube 24, the ratchet transmission assembly provided in this embodiment further includes a first ratchet 27 and a second ratchet 28, wherein the first ratchet 27 is fixed to the top end inside the outer drill tube 9 and can rotate synchronously with the outer drill tube 9, a first pawl 34 adapted to the first ratchet 27 is fixed to the outside of the hollow tube 26, and the second ratchet 28 is fixed above the first ratchet 27, and the second ratchet 28 remains stationary with the road surface in the circumferential direction, that is, the second ratchet 28 does not rotate, and a second pawl 35 adapted to the second ratchet 28 is fixed to the outside of the hollow tube 26, preferably the second ratchet 28. The first pawl member 34 has the same structure as the second pawl member 35, and both are composed of a wheel disc 3501, a fixed pile 3502, a pawl 3503, and a return spring 3504. The wheel disc 3501 is fixed to the outside of the hollow tube 26, and the pawl 3503 is rotatably installed on the inside of the wheel disc 3501. A fixed pile 3502 is fixed on the inside of the wheel disc 3501 near the pawl 3503. A return spring 3504 is installed between the fixed pile 3502 and the pawl 3503. Under the action of the return spring 3504, the pawl 3503 moves in the direction away from the hollow tube 26.

[0051] When the outer drill tube 9 rotates forward, the first ratchet 27 rotates with the outer drill tube 9. At this time, the first ratchet 27 and the first pawl member 34 are locked, further driving the first pawl member 34 to rotate, further causing the first pawl member 34 to drive the hollow tube 26 to rotate. Under the action of the return spring 3504, the pawl 3503 moves in the direction away from the hollow tube 26, thereby causing the second pawl member 35 to rotate, that is, the second pawl member 35 can rotate relative to the second ratchet 28, so that the outer drill tube 9 and the inner drill tube 24 rotate in the same direction and speed. When the outer drill tube 9 rotates reversely, the first ratchet 27 rotates reversely with the outer drill tube 9. At this time, the first ratchet 27 can rotate relative to the first pawl member 34, and the second pawl member 35 is locked by the second ratchet 28, that is, the hollow tube 26 does not rotate, causing the outer drill tube 9 to rotate in the reverse direction and keep the inner drill tube 24 stationary to prevent the inner drill tube 24 from being rotated by the friction of debris and road surface core 16.

[0052] like Figure 4 、 Figure 6 、 Figure 10 、 Figure 11 and Figure 12As shown, in order to achieve the reverse rotation of the outer drill barrel 9 and keep the inner drill barrel 24 stationary, so that the crosscutting cutter head 38 moves radially toward the center of the outer drill barrel 9, the drill bit 11 provided in this embodiment is rotatably connected to the inner drill barrel 24, and a transmission compartment 30 is provided between the inner side of the drill bit 11 and the inner drill barrel 24. An incomplete gear 29 is fixed to the lower end of the outer side of the inner drill barrel 24. A notch 37 is provided on the inside of the drill bit 11, and a rotating shaft 39 fixedly connected to the crosscutting cutter head 38 is rotatably installed in the notch 37. The upper end of the rotating shaft 39 extends into the transmission compartment 30 and is installed with a driven gear 31 that meshes with the incomplete gear 29, and a torsion spring 40 is provided on the outside of the rotating shaft 39. One end of the torsion spring 40 is fixedly connected to the rotating shaft 39, and the other end of the torsion spring 40 is fixed to the side wall of the notch 37, so that the cross-cutting head 38 is reset when the incomplete gear 29 and the driven gear 31 are not meshed. It is preferred to open a mounting groove 41 at the bottom of the notch 37, and the torsion spring 40 is arranged inside the mounting groove 41, and the mounting groove 41 is provided. A partition is provided at the top of the interior that is rotatably connected to the rotating shaft 39 to reduce the ingress of mud and sand. In addition, the bottom of the slot 37 is an inclined structure, which, in conjunction with the vibration effect when the equipment is in use, can significantly reduce the ingress of mud and sand into the slot 37, thereby facilitating the movement of the cross-cutting cutter head 38. In addition, a limiting beak 36 is provided on one side of the slot 37. The teeth on the incomplete gear 29 mesh with the driven gear 31, and when the driven gear 31 rotates to the maximum angle, one side of the cross-cutting cutter head 38 abuts against the limiting beak 36, thereby limiting the cross-cutting cutter head 38 from continuing to rotate, thereby ensuring the best cutting effect. When the teeth on the incomplete gear 29 are not meshed with the driven gear 31, the elastic potential energy of the torsion spring 40 is released to drive the rotating shaft 39 to rotate, thereby driving the cross-cutting cutter heads 38 to retract into the slot 37, so that each cross-cutting cutter head 38 is in intermittent contact with the road surface core 16, thereby facilitating the rest of the cross-cutting cutter head 38 and thereby extending the service life of the cross-cutting cutter head 38.

[0053] It should be noted that the release of the elastic potential energy of the torsion spring 40 requires reaction time. Therefore, the elastic coefficient of the torsion spring 40 is relatively large, and only one or two groups of teeth are set on the incomplete gear 29 as much as possible to give enough time for the elastic potential energy of the torsion spring 40 to be released. In addition, since the outer drill barrel 9 rotates in the opposite direction and the inner drill barrel 24 is stationary at this time, there is no need to increase the length of the pavement core 16. Therefore, the speed of driving the outer drill barrel 9 to rotate can be gradually increased, that is, sufficient time is given at the beginning of cutting to allow the elastic potential energy of the torsion spring 40 to be released. After cutting, the cross-cutting head 38 does not retract in time to provide support for the extraction of the pavement core 16.

[0054] like Figures 1-9As shown, the asphalt pavement core drilling device provided in this embodiment also includes a mobile carrier 1, a push rod is provided on the mobile carrier 1, and a roller is provided at the bottom of the mobile carrier 1. The roller is preferably foldable to facilitate the mobile carrier 1 to move to the specified position, and then fold the roller so that the bottom of the mobile carrier 1 is against the ground, thereby ensuring the stability of the mobile carrier 1 during use. A first supporting plate 4 is also installed on the mobile carrier 1, and the first supporting plate 4 can move in the vertical direction. A second supporting plate 7 is fixed below the first supporting plate 4, and a shaft sleeve 33 is rotatably installed on the second supporting plate 7. The lower end of the shaft sleeve 33 is fixedly connected to the outer drill barrel 9, so that the shaft sleeve 33 drives the outer drill barrel 9 to rotate.

[0055] In addition, the asphalt pavement core drilling device provided in this embodiment also includes a temporary water storage box 8, which is fixed above the second supporting plate 7, and the lower surface of the temporary water storage box 8 is fixedly connected to the second ratchet 28 to prevent the second ratchet 28 from rotating. The upper end of the hollow tube 26 extends into the temporary water storage box 8, and the temporary water storage box 8 is rotatably connected to the hollow tube 26. A water tank 17 and a water pump 18 are also installed on the first supporting plate 4. The water inlet end of the water pump 18 is connected to the water tank 17, and the water outlet end of the water pump 18 is connected to the temporary water storage box 8 through a water pipe 19. Preferably, the water pipe 19 is a corrugated pipe so that the water pipe 19 can meet the needs when the temporary water storage box 8 is raised or lowered.

[0056] Specifically, when in use, the coolant in the water tank 17 is extracted by the water pump 18 and transferred to the temporary water storage box 8 through the water pipe 19 .

[0057] like Figure 5-Figure 8 As shown, the asphalt pavement core drilling device provided in this embodiment also includes a push rod 14, which is arranged on the inner side of the hollow tube 26, and the push rod 14 is axially slidably connected to the hollow tube 26. The push rod 14 can be selected as a prismatic structure. In addition, the push rod 14 is rotatably connected to the temporary water storage box 8, and the upper end of the push rod 14 passes through the temporary water storage box 8 and is equipped with a handle. A compression spring 15 can be optionally installed on the outer side of the push rod 14 between the handle and the temporary water storage box 8. During use, in order to prevent the rotation of the push rod 14 and cause the compression spring 15 to rotate, a swivel rotatably connected to the push rod 14 can be installed on the upper end of the compression spring 15, and a pressure plate 25 is rotatably installed at the lower end of the push rod 14. Anti-slip teeth are provided on the lower surface of the pressure plate 25, and the pressure plate 25 can be optionally slidably connected to the inner wall of the inner drill tube 24.

[0058] like Figure 9 As shown, in order to achieve cooling of the drill bit 11 and the cross-cutting cutter head 38, the lower end of the hollow tube 26 provided in this embodiment extends to the inner drill barrel 24 and is provided with a nozzle 32. The gap between the top rod 14 and the hollow tube 26 is used to transport the coolant in the temporary water storage box 8 to the nozzle 32. The nozzle 32 is arranged at the top end of the inner drill barrel 24, which can reduce the occurrence of clogging of the nozzle 32.

[0059] like Figure 2 and Figure 5 As shown, in order to realize the driving of the outer drill barrel 9, a driving wheel 22 is rotatably mounted on the first supporting plate 4 provided in this embodiment, a driven wheel 20 is mounted on the fixed sleeve outside the shaft sleeve 33, a transmission belt 21 is provided between the driven wheel 20 and the driving wheel 22, and a motor 13 for driving the driving wheel 22 to rotate is installed on the first supporting plate 4.

[0060] When in use, the motor 13 drives the driving wheel 22 to rotate, and the transmission belt 21 drives the driven wheel 20 to rotate, so that the shaft sleeve 33 drives the outer drill tube 9 to rotate.

[0061] like Figure 1-Figure 5 As shown, in order to realize the lifting and lowering of the first supporting plate 4, guide columns 2 are fixed on both sides of the mobile carrier 1 and are slidably connected to the first supporting plate 4. A top plate 3 is fixed between the two guide columns 2. A screw rod 5 is rotatably connected to the mobile carrier 1. The screw rod 5 is rotatably connected to the top plate 3, and a driving remote rod 6 is fixed to the upper end of the screw rod 5. A threaded sleeve 23 threadedly connected to the screw rod 5 is fixed between the first supporting plate 4 and the second supporting plate 7.

[0062] The screw rod 5 is driven to rotate by driving the remote rod 6 , and the first supporting plate 4 and the second supporting plate 7 are lifted and lowered along the guide column 2 through the threaded connection between the screw rod 5 and the threaded sleeve 23 .

[0063] like Figure 1 and Figure 15 As shown, during the coring process, the sampling area is often affected by waste liquid and debris. For this reason, a splash-proof assembly 12 is provided on the mobile carrier 1, and the splash-proof assembly 12 includes a splash-proof ring 1201 fixed on the mobile carrier 1, and the splash-proof ring 1201 is collinear with the axis of the outer drill barrel 9, and the inner diameter of the splash-proof ring 1201 is larger than the maximum outer diameter of the drill bit 11 to ensure that the outer drill barrel 9 and the drill bit 11 can pass through the splash-proof ring 1201, and a flexible gasket 1202 is provided at the bottom of the splash-proof ring 1201 to resist the ground to reduce the outflow of waste liquid and debris from around the borehole, and hollow side brackets 1203 are provided on both sides of the splash-proof ring 1201, and a drain pipe is installed on the side bracket 1203 to facilitate the external water pumping pipe, and an isolation net 1204 is installed on the inner side of the splash-proof ring 1201 at the position of the side bracket 1203, and the isolation net 1204 can be used to achieve filtration when the waste liquid is extracted.

[0064] When in use (working), the mobile carrier 1 is moved to the designated position and fixed, and the remote control rod 6 is rotated to drive the screw rod 5 to rotate. Through the threaded connection between the screw rod 5 and the threaded sleeve 23, the first carrier plate 4 and the second carrier plate 7 are lifted and lowered along the guide column 2, and the motor 13 is started. The motor 13 drives the driving wheel 22 to rotate, and the driven wheel 20 is rotated through the transmission belt 21, so that the shaft sleeve 33 drives the outer drill barrel 9 to rotate in the forward direction, and the ratchet transmission assembly is used to make the outer drill barrel 9, the drill bit 11 and the inner drill barrel 24 rotate synchronously. At the same time, the coolant inside the water tank 17 is extracted by the water pump 18, and the coolant is transferred to the temporary water storage box 8 through the water pipe 19, and the coolant is further sprayed into the inner drill barrel 24 through the hollow tube 26 and the nozzle 32 to achieve cooling of the drill bit 11 and the cross-cutting cutter head 38.

[0065] During this process, an external suction pipe is connected to the side bracket 1203 to extract the waste water in the side bracket 1203, and the flexible gasket 1202 is used to reduce the outflow of waste liquid and debris from around the borehole. The isolation net 1204 can be used to filter the waste liquid during extraction.

[0066] After the drill bit 11 reaches the specified depth, the motor 13 drives the outer drill tube 9 to rotate in the opposite direction. At this time, the first ratchet 27 can rotate relative to the first pawl 34, and the second pawl 35 is locked by the second ratchet 28, that is, the hollow tube 26 does not rotate, so that the outer drill tube 9 rotates in the opposite direction and the inner drill tube 24 is kept stationary, further causing the driven gear 31 on the drill bit 11 to rotate around the axis of the road surface core 16. When the teeth on the incomplete gear 29 engage with the driven gear 31, the cross-cutting head 38 extends from the inside of the notch 37 to achieve cutting of the lower end of the road surface core 16. When the teeth on the gear 29 are not engaged with the driven gear 31, the elastic potential energy of the torsion spring 40 is released to drive the rotating shaft 39 to rotate, thereby driving the cross-cutting head 38 to retract into the inside of the slot 37, so that each cross-cutting head 38 is in intermittent contact with the road surface core 16, which is beneficial to the rest of the cross-cutting head 38 and then extends the service life of the cross-cutting head 38. At this time, the outer drill barrel 9 is driven to rotate in the forward direction again by the motor 13, and the pressure plate 25 applies pressure to the road surface core 16 through the handle and the push rod 14, so that the road surface core 16 is twisted off along the cutting line.

[0067] After the pavement core 16 is twisted off, the push rod 14 is manually rotated to allow the hollow tube 26 to drive the inner drill barrel 24 to rotate, so that the cross-cutting head 38 moves radially toward the center of the outer drill barrel 9 to support the bottom of the pavement core 16. After the first supporting plate 4 is lifted by the screw rod 5 until the outer drill barrel 9 is completely raised to the ground, the push rod 14 is manually rotated until the pavement core 16 falls from the inside of the inner drill barrel 24, completing the collection of the pavement core 16.

[0068] On the other hand, the present invention also provides a method for coring an asphalt pavement, comprising the following steps:

[0069] Step 1: Move the mobile carrier 1 to the designated position and fix it;

[0070] Step 2: Lower the first supporting plate 4 and drive the outer drill barrel 9 to rotate forward by the motor 13, so that the outer drill barrel 9, the drill bit 11 and the inner drill barrel 24 rotate synchronously, and the coolant in the temporary water storage box 8 is input into the inner drill barrel 24 through the hollow tube 26 and the nozzle 32;

[0071] Step 3: Connect an external water extraction pipe to extract the wastewater in the side bracket 1203;

[0072] Step 4: After the drill bit 11 reaches the specified depth, the motor 13 drives the outer drill barrel 9 to rotate in the opposite direction, so that the crosscutting cutter head 38 moves radially toward the center of the outer drill barrel 9 to form a cutting line on the outer peripheral surface of the road surface core 16;

[0073] Step 5: The outer drill tube 9 is driven to rotate forward again by the motor 13, and pressure is applied to the pavement core 16 by the pressure plate 25, so that the pavement core 16 is twisted off along the cutting line;

[0074] Step 6: Manually rotate the push rod 14 to rotate the hollow tube 26 and the inner drill tube 24, so that the crosscutting head 38 moves radially toward the center of the outer drill tube 9 to support the bottom of the road surface core 16;

[0075] Step 7: Lift the first supporting plate 4 until the outer drill tube 9 is completely raised to the ground, and manually rotate the jack 14 until the road surface core 16 falls from the inner drill tube 24 .

[0076] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "includes," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0077] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to the specific embodiments described. Obviously, many modifications and variations are possible based on the content of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. An asphalt pavement core drilling device, comprising an outer drill barrel (9), characterized in that: Also includes: An inner drill tube (24), the inner drill tube (24) being rotatably connected to the inner side of the outer drill tube (9); A drill bit (11), the drill bit (11) is fixed to the lower end of the outer drill tube (9); A cross-cutting cutter head (38), which is arranged on the inner side of the drill bit (11) and is used to cut the lower end of the road surface core (16); A ratchet transmission assembly is provided at the upper end of the outer drill tube (9), which causes the outer drill tube (9) and the inner drill tube (24) to rotate in the same direction at the same speed or to cause the outer drill tube (9) to rotate in the opposite direction while keeping the inner drill tube (24) stationary; The outer drill barrel (9) rotates in the opposite direction and keeps the inner drill barrel (24) stationary, so that the crosscutting cutter head (38) moves radially toward the center of the outer drill barrel (9) to form a cutting line on the outer peripheral surface of the road surface core (16).

2. The asphalt pavement core drilling device according to claim 1, characterized in that: The ratchet transmission assembly comprises: A hollow tube (26), the hollow tube (26) is arranged at the top end of the inner drill tube (24), and the hollow tube (26) is fixedly connected to the inner drill tube (24); A first ratchet (27), the first ratchet (27) is fixed to the top end of the inner portion of the outer drill tube (9), and a first pawl (34) adapted to the first ratchet (27) is fixed to the outer side of the hollow tube (26); A second ratchet (28), the second ratchet (28) is fixed above the first ratchet (27), and the second ratchet (28) remains stationary with the road surface in the circumferential direction, and a second pawl (35) adapted to the second ratchet (28) is fixed on the outside of the hollow tube (26); When the outer drill tube (9) rotates in the forward direction, the first ratchet (27) drives the first pawl (34) to rotate, and at the same time, the second pawl (35) can rotate relative to the second ratchet (28), so that the outer drill tube (9) and the inner drill tube (24) rotate in the same direction and at the same speed. When the outer drill tube (9) rotates in the reverse direction, the first ratchet (27) can rotate relative to the first pawl (34), and at the same time, the second pawl (35) is locked by the second ratchet (28), so that the outer drill tube (9) rotates in the reverse direction and the inner drill tube (24) is kept stationary.

3. The asphalt pavement core drilling device according to claim 1, characterized in that: The drill bit (11) is rotatably connected to the inner drill barrel (24), and a transmission compartment (30) is provided between the inner side of the drill bit (11) and the inner drill barrel (24). An incomplete gear (29) is fixed to the lower end of the outer side of the inner drill barrel (24); A notch (37) is provided on the inner side of the drill bit (11), a rotating shaft (39) fixedly connected to the crosscutting cutter head (38) is rotatably installed in the notch (37), the upper end of the rotating shaft (39) extends into the transmission chamber (30) and is installed with a driven gear (31) meshing with the incomplete gear (29), and a torsion spring (40) is provided on the outer side of the rotating shaft (39), one end of the torsion spring (40) is fixedly connected to the rotating shaft (39), and the other end of the torsion spring (40) is fixed to the side wall of the notch (37), so that the crosscutting cutter head (38) is reset when the incomplete gear (29) is not meshed with the driven gear (31); A limiting beak (36) is provided on one side of the notch (37), and the teeth on the incomplete gear (29) mesh with the driven gear (31), so that when the driven gear (31) rotates to a maximum angle, one side of the cross-cutting blade (38) abuts against the limiting beak (36).

4. The asphalt pavement core drilling device according to claim 2, characterized in that: Also includes: Mobile carrier (1); A first carrying plate (4), the first carrying plate (4) is arranged on the movable carrier (1), and the first carrying plate (4) is movable in a vertical direction; A second bearing plate (7), the second bearing plate (7) is fixed below the first bearing plate (4), a shaft sleeve (33) is rotatably mounted on the second bearing plate (7), and the lower end of the shaft sleeve (33) is fixedly connected to the outer drill tube (9); A temporary water storage box (8), the temporary water storage box (8) is fixed above the second bearing plate (7), and the lower surface of the temporary water storage box (8) is fixedly connected to the second ratchet (28); The upper end of the hollow tube (26) extends into the temporary water storage box (8), and the temporary water storage box (8) is rotatably connected to the hollow tube (26).

5. The asphalt pavement core drilling device according to claim 2, characterized in that: Also includes: A push rod (14), the push rod (14) is arranged inside the hollow tube (26), and the push rod (14) is axially slidably connected to the hollow tube (26); The pressing plate (25) and the push rod (14) are rotatably connected to the temporary water storage box (8), and the upper end of the push rod (14) passes through the temporary water storage box (8) and is equipped with a handle. The lower end of the push rod (14) is rotatably equipped with a pressing plate (25), and the pressing plate (25) is slidably connected to the inner wall of the inner drill tube (24).

6. The asphalt pavement core drilling device according to claim 5, characterized in that: The lower end of the hollow tube (26) extends to the inner drill tube (24) and is provided with a nozzle (32). The gap between the top rod (14) and the hollow tube (26) is used to transport the cooling liquid in the temporary water storage box (8) to the nozzle (32).

7. The asphalt pavement core drilling device according to claim 4, characterized in that: A driving wheel (22) is rotatably mounted on the first bearing plate (4), a driven wheel (20) is mounted on a fixed sleeve outside the shaft sleeve (33), a transmission belt (21) is provided between the driven wheel (20) and the driving wheel (22), and a motor (13) for driving the driving wheel (22) to rotate is mounted on the first bearing plate (4).

8. The asphalt pavement core drilling device according to claim 4, characterized in that: Guide columns (2) slidably connected to the first supporting plate (4) are fixed on both sides of the movable carrier (1), and a screw rod (5) is rotatably connected to the movable carrier (1). A threaded sleeve (23) threadedly connected to the screw rod (5) is fixed between the first supporting plate (4) and the second supporting plate (7).

9. The asphalt pavement core drilling device according to claim 4, characterized in that: The mobile carrier (1) is provided with a splash-proof assembly (12), and the splash-proof assembly (12) includes a splash-proof ring (1201) fixed on the mobile carrier (1), the splash-proof ring (1201) and the axis of the outer drill tube (9) are colinear, and the inner diameter of the splash-proof ring (1201) is larger than the maximum outer diameter of the drill bit (11), a flexible gasket (1202) is provided at the bottom of the splash-proof ring (1201) and is against the ground, and hollow side brackets (1203) are provided on both sides of the splash-proof ring (1201), and an isolation net (1204) is installed on the inner side of the splash-proof ring (1201) at the position of the side bracket (1203).

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