A concrete detection sampling device and method for a tunnel pavement engineering

Abstract

The application relates to the technical field of tunnel pavement detection, and discloses a concrete detection sampling device and a sampling method for tunnel pavement engineering, which comprises a detection drill bit and a clamping cooling mechanism. The detection drill bit can be used for real-time monitoring of the state of a concrete core during sampling, so that the rotation speed of the detection drill bit and the drilling speed can be accurately controlled according to the state of the detected concrete core, and the fractured concrete core can be limited and protected when the concrete core is fractured, so that the fractured concrete core is prevented from inclining, abutting against the inner wall of the detection drill bit and rotating with the detection drill bit, the fractured parts of the concrete core are prevented from rubbing against each other, the height of the concrete core and the structure layer of the concrete core are prevented from being affected to cause inaccurate measurement, the clamping cooling mechanism can improve the stability of the detection drill bit during drilling, indirectly improve the detection accuracy of the vibration sensor, and the detection drill bit can be cooled.

Description

Technical Field

[0001] This invention relates to the field of tunnel pavement testing technology, specifically to a concrete testing and sampling device and method for tunnel pavement engineering. Background Technology

[0002] For existing concrete tunnel pavements, core sampling machines can be used to assess the current condition of the tunnel pavement and determine repair plans when maintenance or repair work is required. If the tunnel pavement is damaged or structurally failed, core sampling machines may be needed to determine the cause of the damage. To assess the long-term performance of concrete, such as freeze-thaw resistance and chemical erosion resistance, core sampling machines are needed for sampling and testing. At the same time, in specific environments, such as high salinity, high chlorine, or other corrosive environments, core sampling machines may be needed to monitor changes in concrete performance.

[0003] Therefore, existing coring machines rely on manual feeding during actual use. However, this method cannot determine whether the feeding speed is correct, nor can it assess the state of the drilled concrete core. Both the rotation speed and feeding speed of the coring machine affect the state of the concrete core. Furthermore, when the concrete core breaks during drilling, the friction between the broken parts affects the height and structural layers of the concrete core, leading to inaccurate measurements. Additionally, existing coring machines are prone to lateral deviation during drilling, which can damage the machine in severe cases. To address these issues, we propose a concrete testing and sampling device and method for tunnel pavement engineering. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a concrete testing and sampling device and method for tunnel pavement engineering, which has the advantages of real-time monitoring of the state of concrete cores and solves a series of problems such as the inability to monitor concrete cores in real time.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a concrete testing and sampling device and method for tunnel pavement engineering, comprising,

[0006] The sampling vehicle includes a vehicle body, a drilling plate is slidably connected to the top of the vehicle body, a fixed head is fixedly connected to one side of the drilling plate, a transmission head is rotatably connected to the bottom of the fixed head, and a detection drill bit is threadedly connected to the bottom of the transmission head.

[0007] The top of the inner wall of the detection drill bit is fixedly connected to a starting shell, the bottom of the starting shell is rotatably connected to a clamping telescopic rod, the bottom of the clamping telescopic rod is threaded with an installation head, the bottom of the installation head is fixedly connected to a fixing threaded rod, the outer thread of the fixing threaded rod is threaded with a fixing nut block, the bottom of the fixing nut block is fixedly connected to a rubber ring, the bottom of the rubber ring is fixedly connected to an installation ring, the top of the installation ring is fixedly installed with a vibration sensor, and the bottom of the fixing threaded rod is fixedly connected to a screw.

[0008] A clamping cooling mechanism, comprising two limiting brackets slidably connected to one side of the vehicle body.

[0009] Preferably, a bearing is fixedly connected to the inner wall of the starting housing, a second engagement ring is fixedly connected to the inner wall of the starting housing, a mounting plate is fixedly connected to the inner wall of the bearing, a first engagement ring is fixedly connected to the inner wall of the bearing, an electric telescopic rod is fixedly installed at the bottom of the mounting plate, and an engagement block is fixedly connected to the telescopic end of the electric telescopic rod. The engagement blocks are all slidably connected inside the first and second engagement rings.

[0010] Preferably, a first sliding sleeve is fixedly connected to the bottom of the engagement block, a second sliding sleeve is slidably connected to the bottom of the first sliding sleeve, a driven plate is fixedly connected to the bottom of the second sliding sleeve, the driven plate is rotatably connected to the bottom of the starting housing, and the abutting telescopic rod is threadedly screwed to the bottom of the driven plate.

[0011] Preferably, the clamping cooling mechanism further includes a water tank installed on one side of the drilling plate, the water tank being filled with water, a first water pump being fixedly installed on the top of the fixing head, the output end of the first water pump being connected to the transmission head, a first water pipe being connected to one side of the water tank, and the other end of the first water pipe being connected to the input end of the first water pump.

[0012] Preferably, a second water pipe is connected to the outside of the first water pipe, and a second water pump is connected to the other end of the second water pipe. A vent shell is fixedly connected to one side of the vehicle body. The output end of the second water pump is connected to the outside of the vent shell. Two pneumatic telescopic rods are fixedly connected to the opposite side of the vent shell. Pressure sensors are fixedly installed at the telescopic ends of the two pneumatic telescopic rods. The detection ends of the two pressure sensors are fixedly connected to one side of the adjacent limit frame.

[0013] Preferably, the pneumatic telescopic rod is externally connected to a lubrication pipe, one end of which is connected to the outside of a nearby lubrication hole. Several lubrication holes are provided on one side of each of the two limiting frames, and these lubrication holes are all connected to the nearby lubrication pipe. A dust guide groove is provided on the outside of the mounting ring. The output end of the first water pump is connected to the inside of the detection drill bit through a transmission head. The opposite sides of the two limiting frames are adapted to the outside of the detection drill bit.

[0014] Preferably, the sampling vehicle further includes a fuel engine fixedly installed on one side of the drilling plate. The output end of the fuel engine and the outside of the transmission head are both fixedly fitted with pulleys, and the two pulleys are rotatably connected to the same transmission belt.

[0015] Preferably, a slide rod is fixedly connected to the top of the vehicle body, the drilling plate is slidably connected to the outside of the slide rod, a drilling motor is fixedly installed on the top of the slide rod, a drilling threaded rod is fixedly connected to the output end of the drilling motor, and the drilling plate is threadedly screwed onto the outside of the drilling threaded rod.

[0016] Preferably, the detection drill bit includes a connector, a connecting neck, and a drill bit. The connecting neck is threaded onto the bottom of the connector, the drill bit is threaded onto the bottom of the connecting neck, the starting housing is fixedly connected to the top of the inner wall of the connector, and a clamping spring is fixedly connected to the top of the inner wall of the clamping telescopic rod.

[0017] Compared with the prior art, the present invention provides a concrete testing and sampling device and method for tunnel pavement engineering, which has the following beneficial effects:

[0018] 1. This invention, through the setting of a detection drill bit, can monitor the state of the concrete core in real time during the sampling process. Based on the state of the detected concrete core, the rotation speed and drilling speed of the detection drill bit can be precisely controlled. When the concrete core breaks, it can limit and protect the broken concrete core, preventing the broken concrete core from tilting and abutting against the inner wall of the detection drill bit and rotating with the detection drill bit. This avoids the broken parts of the concrete core rubbing against each other, which would affect the height and structural layers of the concrete core and lead to inaccurate measurements. Moreover, the detection drill bit eliminates the need to stop drilling and remove the broken concrete core when it breaks, avoiding jamming during secondary drilling after removing the broken concrete core.

[0019] 2. The invention improves the stability of the test drill bit during drilling by setting up a clamping and cooling mechanism, which indirectly improves the detection accuracy of the vibration sensor. At the same time, it can cool down the test drill bit. The invention can also prevent secondary compression of the drill bit when concrete squeezes it, while continuing to limit the drill bit laterally. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0021] Figure 2 This is a three-dimensional structural diagram of the transmission head portion of the present invention;

[0022] Figure 3 This is a three-dimensional structural diagram of the internal structure of the drill bit used in this invention.

[0023] Figure 4 This is a three-dimensional structural diagram of the tensioning telescopic rod portion of the present invention;

[0024] Figure 5 for Figure 4 A magnified structural diagram of part A;

[0025] Figure 6 This is a three-dimensional structural diagram of the driven plate portion of the present invention;

[0026] Figure 7 This is a three-dimensional structural diagram of the meshing block portion of the present invention;

[0027] Figure 8 This is a three-dimensional structural diagram of the water tank part of the present invention;

[0028] Figure 9 This is a three-dimensional structural diagram of the limiting frame part of the present invention.

[0029] In the diagram: 1. Sampling vehicle; 2. Testing drill bit; 3. Clamping and cooling mechanism; 4. Vehicle body; 5. Drilling plate; 6. Connector; 7. Connecting neck; 8. Drill bit; 9. Starting housing; 10. Tensioning telescopic rod; 11. Mounting head; 12. Fixed threaded rod; 13. Fixed nut block; 14. Rubber ring; 15. Mounting ring; 16. Ash guide groove; 17. Vibration sensor; 18. Screw; 19. Tensioning spring; 20. Bearing; 21. Mounting plate; 22. Electric telescopic rod; 23. Engaging block; 24. First engagement ring ; 25. Second engagement ring; 26. First sliding sleeve; 27. Second sliding sleeve; 28. Driven plate; 29. ​​Water tank; 30. First water pipe; 31. First water pump; 32. Second water pipe; 33. Second water pump; 34. Vent housing; 35. Pneumatic telescopic rod; 36. Pressure sensor; 37. Limiting bracket; 38. Lubrication pipe; 39. Lubrication hole; 40. Fuel engine; 41. Sliding rod; 42. Drilling motor; 43. Drilling threaded rod; 44. Fixed head; 45. Pulley; 46. Drive belt; 47. Drive head. Detailed Implementation

[0030] 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.

[0031] As described in the background section, there are shortcomings in the existing technology. In order to solve the above-mentioned technical problems, this application proposes a concrete testing and sampling device and sampling method for tunnel pavement engineering.

[0032] Example 1, such as Figures 1-7 As shown, a concrete testing and sampling device and method for tunnel pavement engineering includes,

[0033] Sampling vehicle 1 includes vehicle body 4, with drilling plate 5 slidably connected to the top of vehicle body 4, a fixed head 44 fixedly connected to one side of drilling plate 5, and a transmission head 47 rotatably connected to the bottom of fixed head 44.

[0034] The sampling vehicle 1 also includes a fuel engine 40 fixedly installed on one side of the drilling plate 5. The output end of the fuel engine 40 and the outside of the transmission head 47 are both fixedly fitted with pulleys 45. The two pulleys 45 are rotatably connected to the same transmission belt 46. The top of the vehicle body 4 is fixedly connected with a slide rod 41. The drilling plate 5 is slidably connected to the outside of the slide rod 41. The top of the slide rod 41 is fixedly installed with a drilling motor 42. The output end of the drilling motor 42 is fixedly connected with a drilling thread rod 43. The drilling plate 5 is threadedly screwed to the outside of the drilling thread rod 43. The bottom of the transmission head 47 is threadedly screwed with a detection drill bit 2.

[0035] Specifically, when it is necessary to test and sample the concrete of the tunnel pavement, the vehicle body 4 is pushed to the testing position, the testing drill bit 2 is aligned with the sampling area, and the vehicle body 4 is fixed. Then, the fuel engine 40 is started. The output end of the fuel engine 40 drives the pulley 45 on it to rotate. The rotation of the pulley 45 drives the transmission belt 46 to rotate. The rotation of the transmission belt 46 drives another pulley 45 to rotate, and drives the transmission head 47 to rotate. The rotation of the transmission head 47 drives the testing drill bit 2 to rotate. At this time, the drilling motor 42 is started. The output end of the drilling motor 42 drives the drilling thread rod 43 to rotate. The rotation of the drilling thread rod 43 drives the drilling plate 5 to slide downward outside the slide rod 41, and drives the testing drill bit 2 to move downward to sample the concrete of the tunnel pavement.

[0036] The test drill bit 2 includes a connector 6, a connecting neck 7, and a drill bit 8. The connecting neck 7 is threaded onto the bottom of the connector 6, and the drill bit 8 is threaded onto the bottom of the connecting neck 7.

[0037] Specifically, the inspection drill bit 2 is a separate assembly type, which is existing technology. It consists of multiple independent parts that are combined together by a specific connection method. Common connection methods include threaded connection and pin connection. When the drill bit 8 is worn or damaged, it is only necessary to remove the drill bit 8 and replace it with a new drill bit 8. There is no need to replace the entire inspection drill bit 2, which reduces the cost of use. At the same time, it is also convenient to repair and maintain the drill bit 8, such as cleaning and lubrication.

[0038] More specifically, the threaded directions of connector 6, connector neck 7 and drill bit 8 are opposite to the rotation direction of drive head 47 to prevent the test drill bit 2 from disintegrating during the sampling process;

[0039] A starting housing 9 is fixedly connected to the top of the inner wall of the test drill bit 2. The starting housing 9 is fixedly connected to the top of the inner wall of the connector head 6. A bearing 20 is fixedly connected to the inner wall of the starting housing 9. A second engagement ring 25 is fixedly connected to the inner wall of the starting housing 9. A mounting plate 21 is fixedly connected to the inner wall of the bearing 20. A first engagement ring 24 is fixedly connected to the inner wall of the bearing 20. An electric telescopic rod 22 is fixedly installed at the bottom of the mounting plate 21. An engagement block 23 is fixedly connected to the telescopic end of the electric telescopic rod 22. The engagement blocks 23 are all slidably connected inside the first engagement ring 24 and the second engagement ring 25. A first sliding sleeve 26 is fixedly connected to the bottom of the engagement block 23. A second sliding sleeve 27 is slidably connected to the bottom of the first sliding sleeve 26. A driven plate 28 is fixedly connected to the bottom of the second sliding sleeve 27. The driven plate 28 is rotatably connected to the bottom of the starting housing 9. A pressing telescopic rod 10 is rotatably connected to the bottom of the starting housing 9. The pressing telescopic rod 10 is threadedly screwed onto the bottom of the driven plate 28.

[0040] A clamping spring 19 is fixedly connected to the top of the inner wall of the clamping telescopic rod 10. An installation head 11 is threadedly connected to the bottom of the clamping telescopic rod 10. A fixing threaded rod 12 is fixedly connected to the bottom of the installation head 11. A fixing nut block 13 is threadedly connected to the outer thread of the fixing threaded rod 12. A rubber ring 14 is fixedly connected to the bottom of the fixing nut block 13. An installation ring 15 is fixedly connected to the bottom of the rubber ring 14. A vibration sensor 17 is fixedly installed on the top of the installation ring 15. A screw 18 is fixedly connected to the bottom of the fixing threaded rod 12.

[0041] It is worth mentioning that there are several tensioning telescopic rods 10 and connecting necks 7, all of different lengths, so that the appropriate tensioning telescopic rods 10 and connecting necks 7 can be selected according to the height of the concrete used in the tunnel pavement project. After selection, the tensioning telescopic rod 10 is threaded onto the bottom of the driven plate 28, and the selected connecting neck 7 is threaded onto the bottom of the connecting head 6. Then, the drill bit 8 is threaded onto the bottom of the connecting neck 7, and the concrete core can be drilled.

[0042] The above-mentioned structure enables real-time monitoring of the concrete core's condition during sampling. This allows for precise control of the rotation speed and drilling speed of the testing drill bit 2 based on the tested concrete core's condition. Furthermore, it provides limiting protection for the broken concrete core when it fractures, preventing it from tilting and contacting the inner wall of the testing drill bit 2, thus avoiding friction between the broken parts and affecting the height and structural layers of the concrete core, which could lead to inaccurate measurements. Specifically, during drilling with the testing drill bit 2, the bottom of the mounting ring 15 contacts the top of the concrete core, generating a tightening force through the tension rod 10. At this time, the vibration of the concrete core is read by the vibration sensor 17. The rubber ring 14 prevents the vibration of the fixing nut block 13 from being read by the vibration sensor 17, improving the reading accuracy of the vibration sensor 17.

[0043] Vibration sensor 17 is existing technology and will not be described in detail here. Vibration sensor 17 can detect the frequency range and amplitude range of an object, specifically;

[0044] I. Frequency Range

[0045] 1. Vibration frequency under normal working conditions: In normal core drilling operations, the vibration frequency of concrete cores is usually between a few hertz and tens of hertz. For example, when using a common concrete core drilling machine, with the rotation speed and feed rate within a reasonable range, the vibration frequency of the concrete core may be around 5-20Hz. This frequency range is mainly caused by the rotation of the detection drill bit 2 and slight axial movement.

[0046] 2. Frequency Changes Due to Rotation Speed: If the drill bit rotates at a high speed, such as 1000-3000 rpm (approximately 16.7-50 Hz) in some high-speed coring machines, the vibration frequency of the concrete core may approach or exceed this range. In this case, the concrete core may generate high-frequency vibrations, possibly at 20-50 Hz or even higher. This is because the high rotation speed significantly increases the impact and cutting frequency of the drill bit 2 on the concrete core, leading to high-frequency radial vibrations. Conversely, if the rotation speed is slower, the vibration frequency may decrease to below 5 Hz. In this case, the force exerted by the drill bit on the concrete core is smaller, and the resulting vibration is also relatively smaller.

[0047] 3. Frequency Variation Due to Feed Rate: Changes in feed rate also affect the vibration frequency. When the feed rate is too fast, the drill bit may bounce within the concrete, causing fluctuations in the vibration frequency of the concrete core. These fluctuations may range from ±2-5 Hz to the normal frequency. For example, if the normal vibration frequency is 10 Hz, an excessively fast feed rate may cause the vibration frequency to fluctuate between 8-12 Hz. Conversely, when the feed rate is too slow, the vibration frequency may decrease slightly, with a decrease of approximately 1-3 Hz.

[0048] II. Amplitude Range

[0049] 1. Amplitude under normal working conditions: During normal core drilling, the amplitude of the concrete core is generally in the millimeter range. Typically, the amplitude may be around 1-3 mm. This is due to the slight shaking caused by the axial and radial forces generated on the concrete core by the detection drill bit 2 during drilling. For example, when drilling in medium-hard concrete, when the parameters of the core drill are set reasonably, the amplitude of the concrete core will be kept within this range, which can make the integrity of the extracted concrete core better.

[0050] 2. Amplitude Changes Due to Rotation Speed: If the rotation speed is too high, the amplitude may increase. When the rotation speed of the detection drill bit 2 exceeds the normal range, the centrifugal force of the drill bit 2 will increase, producing a greater "swinging" effect on the concrete core, and the amplitude may increase to 3-5 mm or even more. For example, in some cases of drilling into hard concrete with excessively high rotation speed, the amplitude of the concrete core may reach 4-6 mm. Conversely, when the rotation speed is too slow, the amplitude may decrease to about 0.5-1 mm because the force exerted by the drill bit 2 on the concrete core is weakened.

[0051] 3. Amplitude variation under the influence of feed rate: Excessive feed rate may increase the amplitude. Due to the unstable contact between the test drill bit 2 and the concrete, the concrete core may experience significant shaking, with an amplitude potentially reaching 2.5-3.5 mm. Conversely, when the feed rate is too slow, the amplitude usually decreases, potentially dropping to around 0.8-1.5 mm. This is because the pressure exerted by the test drill bit 2 on the concrete core is relatively stable but the force is smaller.

[0052] The rotation speed and feed speed of the drill bit 2 can be accurately controlled by the above data and the detection values ​​of the vibration sensor 17.

[0053] More specifically, when the vibration sensor 17 detects a significant abnormality in the frequency and amplitude range of the concrete core, indicating a fracture of the concrete core, the electric telescopic rod 22 is activated. The telescopic end of the electric telescopic rod 22 drives the engaging block 23 to slide inside the first engaging ring 24 and engage with the second engaging ring 25. At this time, the internal and external bearings of the bearing 20 rotate synchronously, driving the engaging block 23 to rotate. The rotation of the engaging block 23 drives the first sliding sleeve 26 to rotate, which in turn drives the second sliding sleeve 27 to rotate. The rotation of the second sliding sleeve 27 drives the driven plate 28 to rotate, which in turn drives the clamping telescopic rod 10 to rotate, which in turn drives the mounting head... When the mounting head 11 rotates, it drives the fixed threaded rod 12 to rotate. Since the bottom of the mounting ring 15 abuts against the top of the concrete core, the fixed threaded rod 12 rotates inside the fixed nut block 13. The fixed nut block 13 moves upward outside the fixed threaded rod 12. During the movement of the fixed nut block 13, the bottom of the screw 18 gradually abuts against the top of the concrete core and drills into the top of the concrete core, thus limiting and fixing the concrete core. At this time, the electric telescopic rod 22 is started in the reverse direction. The telescopic end of the electric telescopic rod 22 drives the meshing block 23 to return to its original position, so that the driven plate 28 rotates at the bottom of the starting shell 9, thereby effectively avoiding friction between the concrete core and the inner wall of the detection drill bit 2.

[0054] It is worth mentioning that during the drilling process, the concrete is subjected to cutting and squeezing action by the detection drill bit 2, which generates a certain stress field around it. When drilling stops halfway, the stress distribution inside the concrete changes, causing slight deformation or displacement of the concrete around the hole wall. Upon restarting, these deformations or displacements may cause the detection drill bit 2 to be subjected to uneven forces, thereby increasing the risk of jamming. In some high-strength concretes, due to their dense structure and high internal stress, stress redistribution is more likely to occur during the stop and restart process, causing the detection drill bit 2 to jam. At the same time, a large amount of concrete powder is generated during the drilling process. If this powder does not have enough time to be discharged from the hole during the stop, it will accumulate inside the hole. Upon restarting, the detection drill bit 2 needs to continue drilling in the powder accumulation environment, which increases the resistance of the drill bit and makes it more prone to jamming. However, by setting the detection drill bit 2 to not stop drilling when the concrete core breaks and remove the broken concrete core, jamming is avoided when re-drilling after removing the broken concrete core.

[0055] Meanwhile, the threaded connection directions of the tensioning telescopic rod 10 and the mounting head 11 are opposite to the rotation direction of the transmission head 47, to prevent the detection drill bit 2 from disintegrating during the sampling process.

[0056] Example 2, as Figure 8 and Figure 9As shown, a concrete testing and sampling device and method for tunnel pavement engineering, based on embodiment 1, includes a clamping and cooling mechanism 3. The clamping and cooling mechanism 3 includes two limiting frames 37 slidably connected to one side of the vehicle body 4. The clamping and cooling mechanism 3 also includes a water tank 29 installed on one side of the drilling plate 5. The water tank 29 is filled with water. A first water pump 31 is fixedly installed on the top of the fixing head 44. The output end of the first water pump 31 is connected to the transmission head 47. A first water pipe 30 is connected to one side of the water tank 29. The other end of the first water pipe 30 is connected to the input end of the first water pump 31.

[0057] The first water pipe 30 is connected to the outside of the second water pipe 32, and the other end of the second water pipe 32 is connected to the second water pump 33. A vent shell 34 is fixedly connected to one side of the vehicle body 4. The output end of the second water pump 33 is connected to the outside of the vent shell 34. Two pneumatic telescopic rods 35 are fixedly connected to the opposite side of the vent shell 34. Pressure sensors 36 are fixedly installed at the telescopic ends of the two pneumatic telescopic rods 35. The detection ends of the two pressure sensors 36 are fixedly connected to one side of the adjacent limit frame 37.

[0058] The pneumatic telescopic rod 35 is externally connected to a lubrication pipe 38. One end of the lubrication pipe 38 is connected to the outside of a nearby lubrication hole 39. Several lubrication holes 39 are opened on one side of each of the two limit frames 37. Several lubrication holes 39 are connected to the nearby lubrication pipe 38. A dust guide groove 16 is opened on the outside of the mounting ring 15. The output end of the first water pump 31 is connected to the inside of the detection drill bit 2 through the transmission head 47. The opposite sides of the two limit frames 37 are adapted to the outside of the detection drill bit 2.

[0059] Furthermore, in the above scheme, the structure described above can improve the stability of the detection drill bit 2 during drilling, improve the detection accuracy of the vibration sensor 17, and cool down the detection drill bit 2. Specifically, when the detection drill bit 2 needs to drill through the tunnel pavement concrete, the second water pump 33 is started, pumping some water from the water tank 29 into the vent housing 34 through the second water pipe 32. At this time, the telescopic ends of the two pneumatic telescopic rods 35 extend and drive the two limit frames 37 to follow the adjacent pressure sensors 36. During the movement, the opposite sides of the two limiting brackets 37 are in contact with the outside of the detection drill bit 2 to laterally limit the detection drill bit 2, preventing it from swaying laterally during drilling. While limiting the detection drill bit 2, some water flows out through the lubrication pipe 38 and lubrication hole 39, adhering to the opposite sides of the two limiting brackets 37 and the outside of the detection drill bit 2, providing lubrication for the detection drill bit 2 and the limiting brackets 37 while cooling the detection drill bit 2. The clamping force at this time can be detected by the two pressure sensors 36.

[0060] It is worth mentioning that the clamping and cooling mechanism 3 can prevent the test drill bit 2 from being rigidly limited, which can effectively avoid damage to the test drill bit 2 due to rigid limitation. If there are defects such as honeycomb, holes, and cracks inside the concrete, the force will be uneven when the drill bit encounters these parts, and it will easily deviate. At this time, the concrete will squeeze the test drill bit 2. If the test drill bit 2 is still rigidly limited, it may be damaged due to excessive pressure, and in severe cases, it may cause injury to people around.

[0061] The working principle of this invention is as follows: When it is necessary to test and sample the concrete of the tunnel pavement, select the appropriate clamping telescopic rod 10 and connecting neck 7 according to the height of the concrete used in the tunnel pavement project. After selection, screw the clamping telescopic rod 10 into the bottom of the driven plate 28, and screw the selected connecting neck 7 into the bottom of the connecting head 6. Then screw the 11 into the bottom of the clamping telescopic rod 10, and finally screw the drill bit 8 into the bottom of the connecting neck 7, so that the concrete core can be drilled.

[0062] At this time, the vehicle body 4 is pushed to the detection position, the detection drill bit 2 is aligned with the sampling area, and the vehicle body 4 is fixed. Then, the fuel engine 40 is started. The output end of the fuel engine 40 drives the pulley 45 on it to rotate. The rotation of the pulley 45 drives the transmission belt 46 to rotate. The rotation of the transmission belt 46 drives another pulley 45 to rotate, and drives the transmission head 47 to rotate. The rotation of the transmission head 47 drives the detection drill bit 2 to rotate. At this time, the drilling motor 42 is started. The output end of the drilling motor 42 drives the drilling thread rod 43 to rotate. The rotation of the drilling thread rod 43 drives the drilling plate 5 to slide downward outside the slide rod 41, and drives the detection drill bit 2 to move downward to sample the concrete of the tunnel road surface.

[0063] When the test drill bit 2 needs to drill into the concrete of the tunnel pavement, the second water pump 33 is started, and some of the water in the water tank 29 is pumped into the vent housing 34 through the second water pipe 32. At this time, the telescopic ends of the two pneumatic telescopic rods 35 extend and drive the two limit frames 37 to move relative to the pressure sensor 36. At this time, the opposite side of the two limit frames 37 is in contact with the outside of the test drill bit 2 to limit the test drill bit 2 laterally, so as to prevent the test drill bit 2 from shaking laterally during drilling. While limiting the test drill bit 2, some water flows out through the lubrication pipe 38 and lubrication hole 39, and adheres to the opposite side of the two limit frames 37 and the outside of the test drill bit 2, providing lubrication for the test drill bit 2 and the limit frames 37 while cooling the test drill bit 2.

[0064] During the drilling process using the test drill bit 2, the bottom of the mounting ring 15 abuts against the top of the concrete core, and a tightening force is generated by the tensioning rod 10. At this time, the vibration of the concrete core will be read by the vibration sensor 17. The rubber ring 14 can prevent the vibration of the fixing nut block 13 from being read by the vibration sensor 17, thereby improving the reading accuracy of the vibration sensor 17. The rotation speed and feed speed of the test drill bit 2 can be accurately controlled by the detection value of the vibration sensor 17.

[0065] When the vibration sensor 17 detects a significant abnormality in the frequency and amplitude range of the concrete core, indicating a fracture in the concrete core, the electric telescopic rod 22 is activated. The telescopic end of the electric telescopic rod 22 drives the meshing block 23 to slide inside the first meshing ring 24 and engage with the second meshing ring 25. At this time, the internal and external parts of the bearing 20 rotate synchronously, driving the meshing block 23 to rotate. The rotation of the meshing block 23 drives the first sliding sleeve 26 to rotate, which in turn drives the second sliding sleeve 27 to rotate. The rotation of the second sliding sleeve 27 drives the driven plate 28 to rotate, which in turn drives the clamping telescopic rod 10 to rotate. The rotation of the clamping telescopic rod 10 drives the mounting head 11 to rotate. The rotation of the mounting head 11 drives the fixed threaded rod 12 to rotate. Since the bottom of the mounting ring 15 abuts against the top of the concrete core, the fixed threaded rod 12 rotates inside the fixed nut block 13. The fixed nut block 13 moves upward outside the fixed threaded rod 12. During the movement of the fixed nut block 13, the bottom of the screw 18 gradually abuts against the top of the concrete core and drills into the top of the concrete core, limiting and fixing the concrete core. At this time, the electric telescopic rod 22 is started in the reverse direction. The telescopic end of the electric telescopic rod 22 drives the meshing block 23 to return to its original position, so that the driven plate 28 rotates at the bottom of the starting shell 9, thereby effectively avoiding friction between the concrete core and the inner wall of the detection drill bit 2 until the drilling is completed.

[0066] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A concrete testing and sampling device for road engineering, characterized in that: include, The sampling vehicle (1) includes a vehicle body (4), a drilling plate (5) is slidably connected to the top of the vehicle body (4), a fixing head (44) is fixedly connected to one side of the drilling plate (5), a transmission head (47) is rotatably connected to the bottom of the fixing head (44), and a detection drill bit (2) is threadedly connected to the bottom of the transmission head (47). The inner wall of the detection drill bit (2) is fixedly connected to the top of the start-up shell (9), the bottom of the start-up shell (9) is rotatably connected to the tension telescopic rod (10), the bottom of the tension telescopic rod (10) is threaded with an installation head (11), the bottom of the installation head (11) is fixedly connected to a fixing threaded rod (12), the outer thread of the fixing threaded rod (12) is threaded with a fixing nut block (13), the bottom of the fixing nut block (13) is fixedly connected to a rubber ring (14), the bottom of the rubber ring (14) is fixedly connected to an installation ring (15), the top of the installation ring (15) is fixedly installed with a vibration sensor (17), and the bottom of the fixing threaded rod (12) is fixedly connected to a screw (18). The clamping cooling mechanism (3) includes two limiting frames (37) that are slidably connected to one side of the vehicle body (4). The inner wall of the starting housing (9) is fixedly connected to a bearing (20), the inner wall of the starting housing (9) is fixedly connected to a second engagement ring (25), the inner wall of the bearing (20) is fixedly connected to a mounting plate (21), the inner wall of the bearing (20) is fixedly connected to a first engagement ring (24), the bottom of the mounting plate (21) is fixedly installed with an electric telescopic rod (22), the telescopic end of the electric telescopic rod (22) is fixedly connected to an engagement block (23), and the engagement blocks (23) are all slidably connected inside the first engagement ring (24) and the second engagement ring (25); The bottom of the engagement block (23) is fixedly connected to a first sliding sleeve (26), the bottom of the first sliding sleeve (26) is slidably connected to a second sliding sleeve (27), the bottom of the second sliding sleeve (27) is fixedly connected to a driven plate (28), the driven plate (28) is rotatably connected to the bottom of the starter housing (9), and the abutting telescopic rod (10) is threadedly connected to the bottom of the driven plate (28).

2. The concrete testing and sampling equipment for road engineering according to claim 1, characterized in that: The clamping cooling mechanism (3) also includes a water tank (29) installed on one side of the drilling plate (5). The water tank (29) is filled with water. A first water pump (31) is fixedly installed on the top of the fixing head (44). The output end of the first water pump (31) is connected to the transmission head (47). A first water pipe (30) is connected to one side of the water tank (29). The other end of the first water pipe (30) is connected to the input end of the first water pump (31).

3. The concrete testing and sampling equipment for road engineering according to claim 2, characterized in that: The first water pipe (30) is connected to the outside of a second water pipe (32), and the other end of the second water pipe (32) is connected to a second water pump (33). A vent shell (34) is fixedly connected to one side of the vehicle body (4). The output end of the second water pump (33) is connected to the outside of the vent shell (34). Two pneumatic telescopic rods (35) are fixedly connected to the opposite side of the vent shell (34). Pressure sensors (36) are fixedly installed at the telescopic ends of the two pneumatic telescopic rods (35). The detection ends of the two pressure sensors (36) are fixedly connected to one side of the adjacent limit frame (37).

4. The concrete testing and sampling equipment for road engineering according to claim 3, characterized in that: The pneumatic telescopic rod (35) is externally connected to a lubrication pipe (38), one end of which is connected to the outside of a nearby lubrication hole (39). Several lubrication holes (39) are provided on one side of each of the two limiting frames (37), and the several lubrication holes (39) are connected to the nearby lubrication pipe (38). A dust guide groove (16) is provided on the outside of the mounting ring (15). The output end of the first water pump (31) is connected to the inside of the detection drill bit (2) through a transmission head (47). The opposite sides of the two limiting frames (37) are adapted to the outside of the detection drill bit (2).

5. A concrete testing and sampling device for road engineering according to claim 1, characterized in that: The sampling vehicle (1) also includes a fuel engine (40) fixedly installed on one side of the drilling plate (5). The output end of the fuel engine (40) and the outside of the transmission head (47) are both fixedly fitted with pulleys (45), and the two pulleys (45) are rotatably connected to the same transmission belt (46).

6. A concrete testing and sampling device for road engineering according to claim 5, characterized in that: A slide rod (41) is fixedly connected to the top of the vehicle body (4). The drilling plate (5) is slidably connected to the outside of the slide rod (41). A drilling motor (42) is fixedly installed on the top of the slide rod (41). A drilling thread rod (43) is fixedly connected to the output end of the drilling motor (42). The drilling plate (5) is threadedly screwed onto the outside of the drilling thread rod (43).

7. A concrete testing and sampling device for road engineering according to claim 6, characterized in that: The detection drill bit (2) includes a connector (6), a connecting neck (7) and a drill bit (8). The connecting neck (7) is threaded onto the bottom of the connector (6), and the drill bit (8) is threaded onto the bottom of the connecting neck (7). The starting housing (9) is fixedly connected to the top of the inner wall of the connector (6), and a clamping spring (19) is fixedly connected to the top of the inner wall of the clamping telescopic rod (10).

8. A sampling method for a concrete testing and sampling device for road engineering, used in the concrete testing and sampling device for road engineering as described in claim 7, characterized in that, Includes the following steps: S1: When it is necessary to test and sample the concrete of the road surface, select the appropriate anti-tightening telescopic rod (10) and connecting neck (7) according to the height of the concrete used in the road project. After selection, screw the anti-tightening telescopic rod (10) into the bottom of the driven plate (28), and screw the selected connecting neck (7) into the bottom of the connecting head (6). Then screw the installation head (11) into the bottom of the anti-tightening telescopic rod (10), and finally screw the drill bit (8) into the bottom of the connecting neck (7) to drill the concrete core. S2: At this time, push the vehicle body (4) to the detection position, align the detection drill bit (2) with the sampling area, and fix the vehicle body (4). Then start the fuel engine (40), and the transmission head (47) rotates to drive the detection drill bit (2) to rotate. At this time, start the drilling motor (42), and the drilling thread rod (43) rotates to drive the drilling plate (5) to slide downward outside the slide rod (41), and drive the detection drill bit (2) to move downward to sample the road concrete. S3: At this time, the second water pump (33) is started to pump some of the water inside the water tank (29) into the vent housing (34). At this time, the extension ends of the two pneumatic telescopic rods (35) extend and drive the two limit frames (37) to move relative to the pressure sensor (36) that is close to it. The opposite side of the two limit frames (37) fits against the outside of the test drill bit (2) to limit the test drill bit (2) laterally. While limiting the test drill bit (2), some water flows out through the lubrication pipe (38) and lubrication hole (39) and adheres to the opposite side of the two limit frames (37) and the outside of the test drill bit (2), providing lubrication for the test drill bit (2) and the limit frames (37) while cooling the test drill bit (2). S4: During the drilling process using the test drill bit (2), the bottom of the mounting ring (15) abuts against the top of the concrete core and generates a tightening force by pressing the telescopic rod (10). At this time, the vibration of the concrete core will be read by the vibration sensor (17). The rubber ring (14) can prevent the vibration of the fixing nut block (13) from being read by the vibration sensor (17), thus improving the reading accuracy of the vibration sensor (17). The rotation speed and feed speed of the test drill bit (2) can be accurately controlled by the detection value of the vibration sensor (17). S5: When the vibration sensor (17) detects that the concrete core is broken, the electric telescopic rod (22) is activated. The meshing block (23) meshes with the first meshing ring (24) and the second meshing ring (25) at the same time. The driven plate (28) rotates and drives the mounting head (11) to rotate. The mounting head (11) rotates and drives the fixed threaded rod (12) to rotate. The fixed threaded rod (12) rotates inside the fixed nut block (13). The fixed nut block (13) moves upward outside the fixed threaded rod (12). The bottom of the screw (18) gradually abuts against the top of the concrete core and drills into the top of the concrete core, limiting and fixing the concrete core. At this time, the electric telescopic rod (22) is activated in the reverse direction, so that the driven plate (28) rotates at the bottom of the starting shell (9), thereby effectively avoiding friction between the concrete core and the inner wall of the detection drill bit (2) until the drilling is completed.

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