Drilling and sampling device for highway engineering quality detection

Abstract

The invention discloses a highway engineering quality detection drilling and sampling device, and relates to the technical field of highway engineering, the highway engineering quality detection drilling and sampling device comprises a base, the side wall of the base is slidably connected with a moving seat, the upper side of the base is fixedly connected with a fixed beam, and the inner wall of the fixed beam is rotatably connected with a threaded rod through a bearing; the lower end of the threaded rod is rotationally connected with the outer wall of the base through a bearing, the inner wall of the fixed beam is rotationally connected with a rotating rod through a bearing, one end of the rotating rod is in transmission connection with the upper side of the threaded rod through a bevel gear set, and the outer wall of the threaded rod is in threaded connection with the inner wall of the movable base. The intelligent sensing system composed of the extension rod, the pressure detection module and the like is arranged, so that a sudden change signal of supporting force when a road surface is drilled through can be accurately captured, the vibration motor is automatically triggered to work, and the effect of intelligently vibrating and layering a drill core and a lower roadbed is achieved; the device has the characteristics of high practicability and capability of avoiding secondary damage to a road structure.

Description

Technical Field

[0001] This invention relates to the field of highway engineering technology, specifically to a drilling and sampling device for highway engineering quality testing. Background Technology

[0002] In highway construction and maintenance management, objective evaluation of pavement quality is crucial. Core drilling is a direct and reliable testing method. By drilling cylindrical core samples from the pavement, key indicators such as thickness, material density, compaction degree, and interlayer bonding can be directly measured. Therefore, the effectiveness of the core drilling device is directly related to the accuracy of the test data and the subsequent health of the pavement. Currently, most common road coring equipment on the market consists of a power system, a drill barrel, a cooling water supply system, and a simple lifting mechanism. Its standard working process is to drive the drill barrel to rotate, supplemented by water cooling, to cut the road surface from top to bottom, and finally the operator uses tools to pry the core sample out of the hole. The existing Chinese patent with publication number CN119618728A discloses a drilling and sampling device for quality inspection of highway engineering. It can drive the rotating cylinder to rotate for sampling and cutting through a rotating drive component. During cutting, the wire saw that bypasses the limiting part will be cooled by coolant in the cooling hole, thereby cooling down the wire saw and transferring the abrasive chips to the cooling hole. Due to the action of the coolant, the abrasive chips are prevented from splashing. However, this traditional method has revealed several inherent flaws in practice: First, the core extraction process is easily obstructed and can easily damage the integrity of the sample. Road pavement layers, such as asphalt concrete or cement concrete, are usually tightly bonded to the subgrade or base layer under long-term loads. When the drill barrel cuts to the bottom of the pavement layer, the lower end of the core sample is often still firmly bonded to the underlying material. If the drill barrel and the core sample are forcibly lifted together at this time, the core sample is very likely to break at the weak point due to the huge adhesive force, and some samples will remain at the bottom of the hole, resulting in sampling failure. If the operator chooses to continue drilling downwards in order to extract an intact core sample, attempting to completely cut off the subgrade material below the core sample, it will cause even more serious problems. Secondly, excessive drilling can cause secondary damage and threaten the safety of the road structure. This is the most prominent drawback of existing technology. Once the drill pipe breaks through the pavement layer and penetrates into the subgrade, it will destroy the original dense structure of the subgrade material and open a through crack. At this time, a large amount of cooling water will rush in and penetrate into the subgrade along this crack, causing the subgrade material to soften and its load-bearing capacity to decrease. Under the repeated action of vehicle weight, the softened area is very prone to uneven settlement, which will eventually manifest as early damage such as network cracks, subsidence or potholes on the road surface around the borehole. This will result in a situation where one area is tested and another is damaged, which violates the original intention of quality inspection. Therefore, there is an urgent need in this field for a new type of drilling and sampling device for highway engineering quality testing. It should not only be able to efficiently and completely drill core samples, but also have intelligent functions such as automatically sensing when drilling through the road surface and taking effective measures to actively promote the separation of the core sample from the underlying layer, while also preventing the leakage of cooling water in real time, so as to avoid secondary damage to the road structure at the source. Summary of the Invention

[0003] The purpose of this invention is to provide a drilling and sampling device for highway engineering quality inspection, so as to solve the problems mentioned in the background art.

[0004] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a drilling and sampling device for highway engineering quality inspection, comprising a base, a movable seat slidably connected to the side wall of the base, a fixed beam fixedly connected to the upper side of the base, a threaded rod rotatably connected to the inner wall of the fixed beam via a bearing, the lower end of the threaded rod being rotatably connected to the outer wall of the base via a bearing, a rotating rod rotatably connected to the inner wall of the fixed beam via a bearing, one end of the rotating rod being drively connected to the upper side of the threaded rod via a bevel gear set, and the outer wall of the threaded rod being threadedly connected to the inner wall of the movable seat; A central control module is fixedly connected to the lower left side of the mobile base. The mobile base includes a control module for issuing start and stop commands to the drive motor and water pump, a power management module for supplying power to the drive motor and water pump, a signal acquisition and processing module, and a drive output module. A gearbox is fixedly connected to the upper right side of the mobile base. The input end of the gearbox is equipped with a drive motor, and the output end of the gearbox is equipped with a hollow drive lever. A water pipe is rotatably connected to the upper side of the hollow drive rod via a bearing. A water pump is installed at the other end of the water pipe. The output end of the water pump is connected to the interior of the water pipe. A drill barrel is fixedly connected to the lower end of the hollow drive rod. A vibration mechanism is installed on the outside of the drill barrel.

[0005] According to the above technical solution, the middle part of the movable seat corresponds vertically to the middle part of the base. The main control module and the gearbox are used to balance the counterweight of the movable seat. The drive motor is used to drive the drill barrel to rotate. The rotating rod is used to drive the threaded rod to rotate and adjust the height of the movable seat.

[0006] According to the above technical solution, the vibration mechanism includes a first spring, the upper end of the first spring is fixedly connected to the lower surface of the movable seat, the lower end of the first spring is fixedly connected to an outer sleeve, the inner wall of the outer sleeve is slidably connected to an outer slip ring, the inner wall of the outer slip ring is rotatably connected to an inner connecting ring through a bearing, the inner wall of the inner connecting ring is fixedly connected to the outer wall of the drill barrel, a vibration motor is also provided inside the drill barrel, the upper end of the hollow drive rod is fixedly connected to the vibration motor, and the output end of the vibration motor is fixedly connected to a counterweight.

[0007] According to the above technical solution, the vibration motor is electrically connected to the control module, the vibration motor drives the counterweight to rotate, the inner wall of the outer sleeve does not contact the outer wall of the drill barrel, the side wall of the hollow drive rod is provided with a limit protrusion, the output end of the gearbox is annular and has a groove on the inner wall, and both the hollow drive rod and the drill barrel can move up and down relative to the gearbox.

[0008] According to the above technical solution, the vibration motor includes a mounting cavity, which is a cavity opened on the upper side inside the drill barrel. A second spring is fixedly connected to the upper side of the inner wall of the mounting cavity. An upper gasket is fixedly connected to the lower end of the second spring. The outer wall of the upper gasket contacts the inner wall of the mounting cavity. A pressure detection module is fixedly connected to the lower side of the upper gasket. A lower gasket is fixedly connected to the lower side of the pressure detection module. The outer wall of the lower gasket contacts the inner wall of the mounting cavity. An extension rod is fixedly connected to the lower side of the lower gasket. The lower end of the extension rod extends to the lower side of the inside of the drill barrel.

[0009] According to the above technical solution, the pressure detection module is electrically connected to the control module. The pressure detection module is used to detect the pressure between the upper and lower pads. The lower side of the extension rod, as well as the lower and upper pads, are all circular ring structures.

[0010] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: The present invention, by setting up a drilling system consisting of a drive motor, a gearbox, a hollow drive rod and a drill barrel, and combining it with a water supply pipeline, realizes mechanical drilling of the road surface with the assistance of cooling and flushing debris, thereby obtaining complete and standardized road surface core samples and effectively preventing the drill bit from overheating and being damaged.

[0011] By incorporating an elastic buffer and release mechanism consisting of a first spring, an outer sleeve, and an outer slip ring, the sudden release of the spring's stored energy at the moment of drilling through the road surface generates a downward vibration, which creates a tiny depression at the bottom of the pavement layer and shakes off the adhering roadbed material, greatly reducing the resistance of core sampling.

[0012] By incorporating an intelligent sensing system consisting of an extension rod and a pressure detection module, the system can accurately capture sudden changes in support force when drilling through the road surface and automatically trigger the vibration motor to operate. This achieves intelligent vibration separation between the drill core and the underlying roadbed, further improving the success rate and integrity of drill core extraction.

[0013] By setting up a linkage control logic between the pressure detection module, the main control module, and the water pump, the cooling water supply is automatically cut off the moment the road surface is penetrated. This effectively prevents water from seeping through and softening the roadbed, avoids secondary damage such as subsidence around the borehole, and protects the overall road structure. Attached Figure Description

[0014] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a three-dimensional structural schematic diagram of the present invention; Figure 2 This is a schematic diagram of the structure on the left side of the present invention; Figure 3 This is a schematic diagram of the base structure of the present invention; Figure 4 This is a schematic diagram of the movable seat structure of the present invention; Figure 5 This is a partial structural schematic diagram of the present invention; Figure 6 This is a schematic diagram of the internal structure of the drill barrel of the present invention; Figure 7 This is the present invention. Figure 6 A magnified structural diagram of A in the middle; Figure 8 This is a schematic diagram of the pressure detection mechanism of the present invention; In the diagram: 1. Base; 2. Movable seat; 3. Fixed beam; 4. Threaded rod; 5. Rotating rod; 6. Main control module; 7. Gearbox; 8. Drive motor; 9. Hollow drive rotating rod; 10. Water pipe; 11. Water pump; 12. Drill barrel; 13. Vibration mechanism; 301. First spring; 302. Outer sleeve; 303. Inner connecting ring; 304. Outer slip ring; 305. Pressure detection mechanism; 306. Vibration motor; 307. Counterweight; 501. Mounting cavity; 502. Second spring; 503. Upper gasket; 504. Pressure detection module; 505. Lower gasket; 506. Extension rod. Detailed Implementation

[0015] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0016] Example 1: Please refer to Figure 1-5 The present invention provides a technical solution: the device is placed on the road surface to be tested, ensuring that the base 1 is stable, the external water source is connected to the water pump 11, and the drive motor 8 is started through the main control module 6; The power of the drive motor 8 is transmitted through the gearbox 7, which drives the hollow drive rod 9 and the drill barrel 12 fixed thereto to rotate at high speed. The operator rotates the rod 5, and under the support of the fixed beam 3, the threaded rod 4 is driven to rotate through the bevel gear set, which forces the moving seat 2 to carry the entire drilling system to move smoothly down along the threaded rod 4 to start drilling. At the same time, the water pump 11 is started, and cooling water is continuously injected into the drill barrel 12 through the water pipe 10 and the hollow drive rod 9 to cool the drill bit and flush away the drilling debris. Once the borehole reaches the predetermined depth, the drive motor 8 and water pump 11 are stopped, and the rotating rod 5 is reversed to lift the drill barrel 12 out of the road surface. Finally, a special clamp is used to remove the complete road surface core sample from the borehole. This method enables standardized, cooled drilling and sampling of road surfaces, effectively preventing drill bit damage due to overheating and ensuring that the obtained core samples are complete, accurate, and meet testing requirements.

[0017] Example 2: Please refer to Figure 1-6 Based on Embodiment 1, the present invention provides a technical solution: when the drill barrel 12 begins to contact the road surface and cut downwards, this function automatically enters the preparation state; During the drilling process, as the drill barrel 12 continues to cut downwards, the moving seat 2 moves downwards, which compresses the first spring 301. At the same time, it drives the outer slip ring 304 and the inner connecting ring 303 to slide upwards within the outer sleeve 302. When the drill barrel is about to cut through the road pavement layer, the supporting force of the pavement layer on the bottom of the drill barrel is weakened instantly because the roadbed on the lower side is relatively soft. At this time, the compressed first spring 301 quickly releases its elastic potential energy, pushing the entire drill barrel 12 and the vibration mechanism 13 to generate a short downward bounce. This springing motion is an automatic, instantaneous step in the drilling process, requiring no additional operation. After the springing motion ends, drilling continues and the drill is lifted. The downward vibration force at this moment can form a tiny annular depression at the bottom of the pavement layer through the drill barrel 12, effectively shaking off the subgrade material adhering to the bottom of the drill core. This reduces the gripping force of the subgrade material on the drill core during core extraction, making it easier to remove the drill core completely.

[0018] Example 3: Please refer to Figure 1-8 Based on Embodiment 1 and Embodiment 2, the present invention provides the following technical solution: When drilling begins, the bottom end of the extension rod 506 contacts the road surface. As the drill barrel 12 moves downward, the road surface pushes the extension rod 506 upward. The lower pad 505 and the upper pad 503 compress the second spring 502, causing the pressure detection module 504 sandwiched in the middle to move inside the mounting cavity 501 while the reading continuously increases. At the moment of cutting through the road surface, the support force drops sharply, and the reading of the pressure detection module 504 will decrease significantly. After the main control module 6 detects this signal, it will immediately trigger the vibration motor 306 to start. The vibration motor 306 drives the counterweight 307 to rotate at high speed, generating high-frequency micro-amplitude vibration. This vibration is transmitted to the drill core inside through the drill barrel 12 and stops automatically after a short period of time. The pressure detection mechanism 305 senses the moment the borehole penetrates, and the subsequent vibration further loosens the bond between the core and the underlying subgrade material, making the separation of the road surface and subgrade more obvious, which greatly reduces the risk of core sampling failure due to the adhesion of subgrade material.

[0019] Example 4: Please refer to Figure 1-8 Based on Embodiments 1, 2 and 3, the present invention provides a technical solution: when the reading of the pressure detection module 504 decreases instantaneously, indicating that the road surface has been penetrated, the signal is received by the main control module 6, and the system will execute two instructions simultaneously: first, start the vibration motor 306 as in Embodiment 3; second, immediately shut down the water pump 11 to stop the water supply. While the vibration-assisted core drilling was being layered, the cooling water supply was stopped. After the vibration was completed, the drill barrel 12 was lifted and the core was removed according to the standard procedure. The core of this function is to prevent water waste and roadbed damage. Timely water cut-off avoids excessive penetration of cooling water into the exposed roadbed under pressure, effectively preventing softening or settlement that may be caused by roadbed immersion in water, and protecting the structural safety of the road surface around the borehole. At the same time, vibration also reduces the adhesion between the drill core and the inner wall of the drill barrel, making the final separation operation more labor-saving and smoother.

[0020] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0021] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A drilling and sampling device for highway engineering quality inspection, comprising a base (1), characterized in that: The base (1) has a sliding seat (2) slidably connected to its side wall. The base (1) has a fixed beam (3) fixedly connected to its upper side. The inner wall of the fixed beam (3) is rotatably connected to a threaded rod (4) via a bearing. The lower end of the threaded rod (4) is rotatably connected to the outer wall of the base (1) via a bearing. The inner wall of the fixed beam (3) is rotatably connected to a rotating rod (5) via a bearing. One end of the rotating rod (5) is connected to the upper side of the threaded rod (4) via a bevel gear set. The outer wall of the threaded rod (4) is threadedly connected to the inner wall of the sliding seat (2). The lower left side of the movable seat (2) is fixedly connected to the main control module (6), and the upper right side of the movable seat (2) is fixedly connected to the gearbox (7). The input end of the gearbox (7) is provided with a drive motor (8), and the output end of the gearbox (7) is provided with a hollow drive rod (9). The upper side of the hollow drive rod (9) is rotatably connected to a water pipe (10) via a bearing. A water pump (11) is provided at the other end of the water pipe (10). The output end of the water pump (11) is connected to the interior of the water pipe (10). A drill barrel (12) is fixedly connected to the lower end of the hollow drive rod (9). A vibration mechanism (13) is provided on the outside of the drill barrel (12).

2. The drilling and sampling device for highway engineering quality inspection according to claim 1, characterized in that: The middle part of the movable seat (2) corresponds vertically to the middle part of the base (1). The main control module (6) and the gearbox (7) are used to balance the counterweight of the movable seat (2). The drive motor (8) is used to drive the drill barrel (12) to rotate. The rotating rod (5) is used to drive the threaded rod (4) to rotate and adjust the height of the movable seat (2).

3. The drilling and sampling device for highway engineering quality inspection according to claim 2, characterized in that: The mobile base (2) includes a control module for sending start and stop commands to the drive motor (8) and the water pump (11), a power management module for supplying power to the drive motor (8) and the water pump (11), a signal acquisition and processing module, and a drive output module.

4. The drilling and sampling device for highway engineering quality inspection according to claim 3, characterized in that: The vibration mechanism (13) includes a first spring (301), the upper end of the first spring (301) is fixedly connected to the lower surface of the movable seat (2), the lower end of the first spring (301) is fixedly connected to an outer sleeve (302), the inner wall of the outer sleeve (302) is slidably connected to an outer slip ring (304), the inner wall of the outer slip ring (304) is rotatably connected to an inner connecting ring (303) through a bearing, the inner wall of the inner connecting ring (303) is fixedly connected to the outer wall of the drill barrel (12), the drill barrel (12) is also provided with a vibration motor (306), the upper end of the hollow drive rod (9) is fixedly connected to the vibration motor (306), and the output end of the vibration motor (306) is fixedly connected to a counterweight (307).

5. The drilling and sampling device for highway engineering quality inspection according to claim 4, characterized in that: The vibration motor (306) is electrically connected to the control module. The vibration motor (306) drives the counterweight (307) to rotate. The inner wall of the outer sleeve (302) does not contact the outer wall of the drill barrel (12). The side wall of the hollow drive rod (9) is provided with a limit protrusion. The output end of the gearbox (7) is annular and has a groove on its inner wall. The hollow drive rod (9) and the drill barrel (12) can move up and down relative to the gearbox (7).

6. The drilling and sampling device for highway engineering quality inspection according to claim 5, characterized in that: The vibration motor (306) includes a mounting cavity (501), which is a cavity opened on the upper side inside the drill barrel (12). A second spring (502) is fixedly connected to the upper side of the inner wall of the mounting cavity (501). An upper gasket (503) is fixedly connected to the lower end of the second spring (502). The outer wall of the upper gasket (503) is in contact with the inner wall of the mounting cavity (501). A pressure detection module (504) is fixedly connected to the lower side of the upper gasket (503). A lower gasket (505) is fixedly connected to the lower side of the pressure detection module (504). The outer wall of the lower gasket (505) is in contact with the inner wall of the mounting cavity (501). An extension rod (506) is fixedly connected to the lower side of the lower gasket (505). The lower end of the extension rod (506) extends to the lower side of the inside of the drill barrel (12).

7. A borehole sampling device for highway engineering quality inspection according to claim 6, characterized in that: The pressure detection module (504) is electrically connected to the control module. The pressure detection module (504) is used to detect the pressure between the upper gasket (503) and the lower gasket (505). The lower side of the extension rod (506) and the lower gasket (505) and the upper gasket (503) are all ring structures.

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