A pavement thickness detection device and method for highway engineering

Abstract

The application discloses a kind of road surface thickness detection device and detection method for highway engineering, belong to road surface thickness detection field.A kind of road surface thickness detection device for highway engineering, including fixed frame, the middle position of fixed frame is equipped with drilling mechanism, drilling mechanism is used to carry out drilling operation to asphalt pavement;Piston mechanism, piston mechanism is installed on drilling mechanism;Deflation mechanism;Release mechanism.The application can clean the impurities such as dust on the road surface during thickness measurement, prevent the damage of drill bit caused by impurities on the road surface, as the drilling depth increases, the filled acid-base reagent is released to the periphery of drill bit, the drill bit is cooled, after drilling is completed, due to the setting of acid-base reagent, the color change will occur at the contact part of drill bit outside and soil or concrete, so that personnel can quickly obtain the thickness of asphalt pavement according to color change, without the investment of external measuring equipment, the burden of personnel is reduced, and the measurement efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of road surface thickness detection, in particular to a road surface thickness detection device and method for highway engineering. BACKGROUND

[0002] Road surface thickness detection is an important work, which can be used to evaluate the structural condition of the road and determine whether repair or repaving is needed. The following are several common methods for detecting road surface thickness: Drilling measurement method: This is a method of directly measuring the thickness of the road surface. By drilling holes in the road surface, and then using measuring tools (such as drilling rock hammer, measuring ruler, etc.) to measure the drilling depth, so as to determine the thickness of the road surface. This method is relatively accurate, but requires a lot of manpower and material resources. Non-destructive thickness measurement method: This method uses non-destructive testing techniques such as radar, ultrasonic waves, etc. to measure the thickness of the road surface. This method does not need to destroy the road surface structure, and can quickly and accurately obtain the thickness information of the road surface. But it needs professional instruments and technical personnel to operate. Camera measurement method: Using a camera to detect the thickness of the road surface is also a common method. By taking photos or videos of the road surface, and using computer image processing technology to measure the thickness of the road surface. This method is simple to operate and has low cost, but the accuracy may be affected by light and camera equipment. Gravity method: This method is mainly used to detect the combination of roadbed and road surface and estimate the thickness of the road surface. By placing a weight on the road surface, the gravity acting on the road surface is used to estimate the thickness of the road surface. This method is simple to implement, but the accuracy is relatively low, and it is only suitable for rough thickness estimation.

[0003] At present, when detecting the thickness of the asphalt road surface, the drilling method is generally used to drill holes in the asphalt road surface, then the asphalt layer and the soil layer in the drilling hole are taken out, the asphalt layer is measured, and the thickness of the asphalt layer is obtained. This method can also obtain the thickness of the asphalt road surface, but the labor burden of personnel is large, and when measuring the thickness of the asphalt road surface, multiple points need to be measured, and if the samples in the points are confused, the accuracy of the road surface thickness measurement will be affected. SUMMARY

[0004] The purpose of the present application is to solve the problem of complicated measurement process and sample confusion in the prior art, which affects the accuracy of road surface thickness measurement, and a road surface thickness detection device and method for highway engineering are proposed.

[0005] In order to achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows:

[0006] A road surface thickness detection device for highway engineering, comprising a fixing frame, a drilling mechanism is installed at the middle position of the fixing frame, and the drilling mechanism is used for drilling operation on the asphalt road surface.

[0007] A piston mechanism is mounted on a drilling mechanism and performs piston movement when the drilling mechanism moves up and down.

[0008] A venting mechanism, which is installed inside the piston mechanism, is used to blow gas into the piston mechanism;

[0009] A release mechanism, which is mounted on the drilling mechanism, is used to control the stopping of the drilling mechanism and the fluid flow of the piston mechanism.

[0010] To perform drilling operations on asphalt pavement for detecting its thickness, the drilling mechanism preferably includes a cylinder mounted on the top of a fixed frame. A telescopic rod is fixedly connected to the output end of the cylinder, and a connecting plate is fixedly connected to the bottom of the telescopic rod. A motor is installed at the bottom center of the connecting plate, and a drill bit is installed at the output end of the motor.

[0011] In order to blow air into the drilling site and inject acid or alkali reagents into the drilling site during drilling, preferably, the piston mechanism includes a piston cylinder installed at the bottom of the connecting plate, a piston plate slidably connected to the inner side wall of the piston cylinder, a groove formed on the outer side wall of the piston plate, an insertion slot formed on the top of the piston plate, an indicator rod fixedly connected to the bottom of the piston plate, a base plate fixedly connected to the bottom of the indicator rod, an injection hole formed on the inner side wall of the base plate, and an air inlet formed on the outer side wall of the piston cylinder.

[0012] In order to blow air into the drilling area to clean the drilling area at the beginning of the drilling stage, the air release mechanism further includes a bonding plate that is slidably connected to the inner wall of the piston cylinder. A plug is fixedly connected to the bottom center of the bonding plate. A positioning groove is opened on the outer wall of the bonding plate. A positioning head is attached to the inner wall of the positioning groove. A positioning spring is fixedly connected to the end of the positioning head away from the positioning groove.

[0013] To facilitate the measurement of asphalt pavement thickness after drilling, the release mechanism further includes an inlet pipe fixedly connected to the top of the connecting plate. A plug is slidably connected to the inner wall of the inlet pipe, a return spring is fixedly connected to the bottom of the plug, a slide rod is fixedly connected to the top of the plug, an electrode plate is fixedly connected to the outer wall of the slide rod, a connecting pipe is slidably connected to the outer wall of the slide rod, an electrode block is fixedly connected to the inner wall of the connecting pipe, a push rod is attached to the top of the slide rod, a corrugated pipe is fixedly connected to the end of the inlet pipe away from the connecting plate, and a liquid tank is fixedly connected to the top of the corrugated pipe.

[0014] Furthermore, the telescopic rod passes through the middle of the fixed frame and is fixedly connected to the fixed frame.

[0015] Furthermore, the outer wall of the indicator rod is slidably connected to the inner wall of the piston cylinder, the indicator rod is connected to the insertion slot and the ground plate, and the drill bit is located in the middle of the ground plate.

[0016] Furthermore, the connector is adapted to the connector slot, the outer wall of the positioning head is slidably connected to the inner wall of the piston cylinder, and the end of the positioning spring away from the positioning head is fixedly connected to the inside of the side wall of the piston cylinder.

[0017] Furthermore, the inlet pipe is connected to the piston cylinder, the connecting pipe is fixedly connected to the inlet pipe, the top of the push rod is fixedly connected to the bottom of the fixing frame, the liquid tank is fixedly connected to the top of the fixing frame, and the bottom of the return spring is fixedly connected to the top of the connecting plate.

[0018] A method for detecting pavement thickness in highway engineering includes the following steps:

[0019] Step 1: Move the mounting bracket to the testing position;

[0020] Step 2: Start the drilling mechanism to drill holes at the detection location;

[0021] Step 3: After drilling is completed, start the drilling mechanism to remove the drill bit. When the drill bit just reaches above the road surface, the release mechanism will cut off the power to the drilling mechanism.

[0022] Step 4: Record the depth of the drill bit into the soil using the indicator rod, and then manually return the drilling mechanism to its initial position;

[0023] Step 5: Record the depth of the colored area of ​​the drill bit again, and then subtract the colored depth from the depth of penetration to obtain the thickness of the asphalt pavement.

[0024] Compared with the prior art, the present invention provides a pavement thickness detection device and detection method for highway engineering, which has the following beneficial effects:

[0025] 1. The pavement thickness testing device used in this highway project requires drilling holes in the pavement for thickness measurement. Through the use of cylinders and telescopic rods, the contact plate, propelled by the pavement and the telescopic rod, first blows air into the drilling area to clean away dust and other impurities, preventing damage to the drill bit. As the drilling depth increases, acidic or alkaline reagents are released to the periphery of the drill bit, cooling it. When the drill bit reaches concrete or soil, the acidic or alkaline reagents react with the concrete or soil, causing discoloration at the contact point with the concrete or soil, while the contact point with asphalt remains unchanged. This facilitates direct measurement of the asphalt pavement thickness without the need for sample measurement, reducing the workload for personnel and improving the efficiency and accuracy of asphalt pavement thickness measurement.

[0026] 2. The pavement thickness detection device used in this highway project operates as follows: After drilling is completed, the piston cylinder cannot form a passage due to the blockage of the inlet pipe, preventing the piston plate from sliding downwards. Furthermore, during the drill bit removal process, the contact plate remains in the same position as during drilling. Just as the drill bit is withdrawn from the drilled hole, the electrode plate on the blockage block of the inlet pipe contacts the electrode block, de-energizing the cylinder. The depth of the drill bit's penetration is recorded via the indicator rod connected to the bottom of the piston plate. Then, the cylinder is manually energized to release the blockage of the inlet pipe. The contact plate and telescopic rod then reset, and the depth indicated by the drill bit's color is recorded again. The thickness of the asphalt pavement is obtained by subtracting the depth indicated by the color from the depth of penetration. The device is simple and quick to operate, provides high measurement accuracy, eliminates the need for external measuring equipment, reduces personnel workload, and improves measurement efficiency.

[0027] The parts of this device not described herein are the same as or can be implemented using existing technologies. When measuring thickness, this invention can clean dust and other impurities on the road surface to prevent damage to the drill bit. As the drilling depth increases, the acid and alkali reagents are released to the periphery of the drill bit to cool it down. After drilling is completed, the acid and alkali reagents will cause a color change at the contact area between the outside of the drill bit and the soil or concrete, allowing personnel to quickly determine the thickness of the asphalt pavement based on the color change. This eliminates the need for external measuring equipment, reduces the burden on personnel, and improves measurement efficiency. Attached Figure Description

[0028] Figure 1 This is a three-dimensional structural diagram of a road surface thickness detection device for highway engineering proposed in this invention;

[0029] Figure 2 This is a three-dimensional partial cross-sectional structural diagram of a road surface thickness detection device for highway engineering proposed in this invention;

[0030] Figure 3 This is a frontal cross-sectional view of the pavement thickness detection device for highway engineering proposed in this invention.

[0031] Figure 4 This invention proposes a pavement thickness detection device for highway engineering. Figure 3 Enlarged structural diagram at point A in the middle;

[0032] Figure 5 This invention proposes a pavement thickness detection device for highway engineering. Figure 3 Enlarged structural diagram at point B;

[0033] Figure 6This is a three-dimensional partial cross-sectional structural diagram of the drilling mechanism, piston mechanism, and release mechanism of a road surface thickness detection device for highway engineering proposed in this invention.

[0034] Figure 7 This is a three-dimensional partial cross-sectional structural diagram of the piston mechanism of a road surface thickness detection device for highway engineering proposed in this invention.

[0035] In the diagram: 1. Fixing frame; 2. Drilling mechanism; 21. Cylinder; 22. Telescopic rod; 23. Connecting plate; 24. Motor; 25. Drill bit; 3. Piston mechanism; 31. Piston cylinder; 32. Piston plate; 33. Groove; 34. Insertion slot; 35. Indicator rod; 36. Floor plate; 37. Injection hole; 38. Air inlet; 4. Venting mechanism; 41. Adhesive plate; 42. Insertion connector; 43. Positioning groove; 44. Positioning head; 45. Positioning spring; 5. Release mechanism; 51. Liquid inlet pipe; 52. Block; 53. Return spring; 54. Sliding rod; 55. Electrode plate; 56. Electrode block; 57. Connecting pipe; 58. Push rod; 59. Bellows; 510. Liquid tank. Detailed Implementation

[0036] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0037] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0038] Reference Figures 1-3 , Figure 6 , Figure 7 A road surface thickness detection device for highway engineering includes a fixed frame 1. A drilling mechanism 2 is installed in the middle of the fixed frame 1. The drilling mechanism 2 is used to drill holes in the asphalt pavement. The drilling mechanism 2 includes a cylinder 21 installed on the top of the fixed frame 1. A telescopic rod 22 is fixedly connected to the output end of the cylinder 21. The telescopic rod 22 passes through the middle of the fixed frame 1 and is fixedly connected to the fixed frame 1. A connecting plate 23 is fixedly connected to the bottom of the telescopic rod 22. A motor 24 is installed in the middle of the bottom of the connecting plate 23. A drill bit 25 is installed at the output end of the motor 24.

[0039] It should be noted that the above-mentioned structure allows for direct drilling through the road surface, thereby enabling the measurement of the thickness of the asphalt pavement.

[0040] Reference Figures 1-4 , Figure 6 , Figure 7 Piston mechanism 3 is mounted on drilling mechanism 2 and performs piston movement when drilling mechanism 2 moves up and down. Piston mechanism 3 includes piston cylinder 31 mounted on bottom of connecting plate 23. Piston plate 32 is slidably connected to inner side wall of piston cylinder 31. Groove 33 is opened on outer side wall of piston plate 32. Insertion groove 34 is opened on top of piston plate 32. Indicator rod 35 is fixedly connected to bottom of piston plate 32. Outer side wall of indicator rod 35 is slidably connected to inner side wall of piston cylinder 31. Indicator rod 35 is connected to insertion groove 34 and floor plate 36. Floor plate 36 is fixedly connected to bottom of indicator rod 35. Drill bit 25 is set in the middle of floor plate 36. Liquid injection hole 37 is opened on inner side wall of floor plate 36. Air inlet hole 38 is opened on outer side wall of piston cylinder 31.

[0041] It should be noted that a one-way valve is installed inside the indicator rod 35, so that the gas and liquid in the piston cylinder 31 can only be discharged through the indicator rod 35. A one-way valve is installed inside the air inlet 38, so that external gas can only enter the piston cylinder 31 through the air inlet 38.

[0042] Reference Figure 3 , Figure 4 , Figure 7 The venting mechanism 4 is installed inside the piston mechanism 3 and is used to blow gas into the piston mechanism 3. The venting mechanism 4 includes a bonding plate 41 that is slidably connected to the inner side wall of the piston cylinder 31. A plug 42 is fixedly connected to the bottom center of the bonding plate 41. The plug 42 is adapted to the plug groove 34. A positioning groove 43 is opened on the outer side wall of the bonding plate 41. A positioning head 44 is attached to the inner side wall of the positioning groove 43. The outer side wall of the positioning head 44 is slidably connected to the inner side wall of the piston cylinder 31. A positioning spring 45 is fixedly connected to the end of the positioning head 44 away from the positioning groove 43. The end of the positioning spring 45 away from the positioning head 44 is fixedly connected to the inside of the side wall of the piston cylinder 31.

[0043] It should be noted that an overflow valve is installed inside the connector 42. When the piston plate 32 is in contact with the bonding plate 41 and the piston plate 32 is about to slide upward, the liquid pressure at the top of the bonding plate 41 will be equal to the pressure required to open the overflow valve. Only then will the connector 42 release the acid and alkali reagents at the top of the bonding plate 41.

[0044] Reference Figures 1-3 , Figure 5 , Figure 6Release mechanism 5, installed on drilling mechanism 2, is used to control the stopping of drilling mechanism 2 and the fluid flow of piston mechanism 3. Release mechanism 5 includes a liquid inlet pipe 51 fixedly connected to the top of connecting plate 23, liquid inlet pipe 51 communicating with piston cylinder 31, a block 52 slidably connected to the inner wall of liquid inlet pipe 51, a return spring 53 fixedly connected to the bottom of block 52, the bottom of return spring 53 fixedly connected to the top of connecting plate 23, and a slide rod 54 fixedly connected to the top of block 52. An electrode plate 55 is fixedly connected to the outer wall of the slide rod 54. A connecting pipe 57 is slidably connected to the outer wall of the slide rod 54. The connecting pipe 57 is fixedly connected to the liquid inlet pipe 51. An electrode block 56 is fixedly connected to the inner wall of the connecting pipe 57. A push rod 58 is attached to the top of the slide rod 54. The top of the push rod 58 is fixedly connected to the bottom of the fixing frame 1. A corrugated pipe 59 is fixedly connected to the end of the liquid inlet pipe 51 away from the connecting plate 23. A liquid tank 510 is fixedly connected to the top of the corrugated pipe 59. The liquid tank 510 is fixedly connected to the top of the fixing frame 1.

[0045] It should be noted that a one-way valve is installed in the inlet pipe 51, so that the acid and alkali reagents in the liquid tank 510 can only enter the piston cylinder 31 through the inlet pipe 51, and a liquid filling port is provided on the top of the liquid tank 510.

[0046] In this invention, when in use, sufficient acid and alkali reagents are added into the liquid tank 510 through the liquid inlet. The acid and alkali reagents in the liquid tank 510 will enter the piston cylinder 31 through the corrugated pipe 59 and the liquid inlet pipe 51 and reach the top of the bonding plate 41.

[0047] Then, the fixing frame 1 is moved to the detection position so that the flooring 36 contacts the ground. At this time, the cylinder 21 and motor 24 can be started to begin the drilling operation. The cylinder 21 causes the telescopic rod 22 to extend, and the connecting plate 23 pushes the motor 24 and the drill bit 25 to move downward, thereby causing the flooring 36 to move upward relative to the drill bit 25. The indicator rod 35 causes the piston plate 32 to slide upward along the inner wall of the piston cylinder 31, squeezing the gas in the space formed by the bottom of the bonding plate 41 and the top of the piston plate 32 into the indicator rod 35, and then into the flooring 36. Finally, the gas is blown into the drilling part through the injection hole 37 to clean the dust and other impurities on the road surface and prevent the impurities on the road surface from damaging the drill bit 25, until the connector 42 enters the connector slot 34.

[0048] At this time, the bonding plate 41 is in contact with the piston plate 32, and as the drill bit 25 continues to move downward, the piston plate 32 continues to slide upward. At this time, the liquid pressure at the top of the bonding plate 41 will be equal to the pressure required to open the overflow valve. When the force of the piston plate 32 sliding upward causes the positioning head 44 to be pulled out of the positioning groove 43, the connector 42 releases the acid and alkali reagent at the top of the bonding plate 41 into the indicator rod 35, then into the bonding floor 36, and finally through the injection hole 37 to the periphery of the drill bit 25 to cool the drill bit 25. When the drill bit 25 drills into the concrete or soil, the acid and alkali reagent reacts with the concrete or soil, causing the part of the drill bit 25 in contact with the concrete or soil to change color, while the part in contact with the asphalt does not change color. This makes it easier to directly measure the thickness of the asphalt pavement without measuring the sample, reducing the burden on personnel and improving the efficiency and accuracy of asphalt pavement thickness measurement.

[0049] During this process, due to the downward movement of the connecting plate 23, the push rod 58 will not be able to contact the slide rod 54, and the slide rod 54 and the block 52 will slide upward under the action of the return spring 53 to block the liquid inlet pipe 51.

[0050] After drilling is completed, the cylinder 21 is activated to retract the telescopic rod 22. Due to the blockage of the inlet pipe 51, the piston cylinder 31 cannot form a passage, and the piston plate 32 cannot slide downwards. Furthermore, during the removal of the drill bit 25 after drilling, the floor contact 36 remains in the same position as during drilling. Just as the drill bit 25 is withdrawn from the drilled hole, the electrode plate 55 on the sliding rod 54 connected to the top of the block 52 blocking the inlet pipe 51 contacts the electrode block 56, causing the cylinder 21 to be de-energized. At this point, the piston plate 32 can be retracted through the connection at the bottom... The indicator rod 35 records the penetration depth of the drill bit 25. Then, the cylinder 21 is manually energized. As the telescopic rod 22 fully retracts, the push rod 58 pushes the slide rod 54 downward, preventing the block 52 from sealing the inlet pipe 51. This continues until the telescopic rod 22 fully retracts. At this point, the depth of the drill bit 25 is recorded again. Then, the thickness of the asphalt pavement is obtained by subtracting the depth of penetration from the depth of penetration. The operation is simple and quick, with high measurement accuracy. No external measuring equipment is required, which reduces the burden on personnel and improves measurement efficiency.

[0051] During this process, since the inlet pipe 51 is no longer blocked by the block 52, the acid and alkali reagents in the liquid tank 510 will enter the piston cylinder 31 through the bellows 59 and the inlet pipe 51. The bonding plate 41 and the piston plate 32 will slide downward as the liquid enters until the positioning head 44 is reinserted into the positioning groove 43. At this time, the piston plate 32 will continue to slide downward, allowing external gas to enter the piston cylinder 31 through the air inlet 38, which is convenient for measuring the next point.

[0052] Reference Figures 1-7 A method for detecting pavement thickness in highway engineering includes the following steps:

[0053] Step 1: Move the mounting bracket 1 to the detection position;

[0054] Step 2: Start drilling mechanism 2 to drill holes at the detection location;

[0055] When the flooring 36 comes into contact with the ground, the cylinder 21 and motor 24 can be activated to begin drilling. The cylinder 21 extends the telescopic rod 22, which pushes the motor 24 and drill bit 25 downward through the connecting plate 23. This causes the flooring 36 to move upward relative to the drill bit 25. The piston plate 32 slides upward along the inner wall of the piston cylinder 31 through the indicator rod 35, squeezing the gas in the space formed by the bottom of the bonding plate 41 and the top of the piston plate 32 into the indicator rod 35, and then into the flooring 36. Finally, the gas is blown into the drilling area through the injection hole 37 to clean the dust and other impurities on the road surface, preventing impurities from damaging the drill bit 25, until the connector 42 enters the connector slot 34.

[0056] At this time, the bonding plate 41 is in contact with the piston plate 32, and as the drill bit 25 continues to move downward, the piston plate 32 continues to slide upward. At this time, the liquid pressure at the top of the bonding plate 41 will be equal to the pressure required to open the overflow valve. When the force of the piston plate 32 sliding upward causes the positioning head 44 to be pulled out of the positioning groove 43, the connector 42 releases the acid and alkali reagent at the top of the bonding plate 41 into the indicator rod 35, then into the bonding floor 36, and finally through the injection hole 37 to the periphery of the drill bit 25 to cool the drill bit 25. When the drill bit 25 drills into the concrete or soil, the acid and alkali reagent reacts with the concrete or soil, causing the part of the drill bit 25 in contact with the concrete or soil to change color, while the part in contact with the asphalt does not change color. This makes it easier to directly measure the thickness of the asphalt pavement without measuring the sample, reducing the burden on personnel and improving the efficiency and accuracy of asphalt pavement thickness measurement.

[0057] During this process, due to the downward movement of the connecting plate 23, the push rod 58 will not be able to contact the slide rod 54, and the slide rod 54 and the block 52 will slide upward under the action of the return spring 53 to block the liquid inlet pipe 51.

[0058] Step 3: After drilling is completed, start drilling mechanism 2 to take out drill bit 25. When drill bit 25 just reaches above the road surface, release mechanism 5 cuts off power to drilling mechanism 2.

[0059] After drilling is completed, the cylinder 21 is activated to retract the telescopic rod 22. Due to the blockage of the inlet pipe 51, the piston cylinder 31 cannot form a passage, and the piston plate 32 will not be able to slide down. Furthermore, during the process of removing the drill bit 25 after drilling, the floor contact 36 remains in the same position as when drilling. Just as the drill bit 25 is pulled out of the drilled hole, the electrode plate 55 on the slide rod 54 connected to the top of the block 52 that blocks the inlet pipe 51 comes into contact with the electrode block 56, causing the cylinder 21 to be de-energized.

[0060] Step 4: Record the depth of the drill bit 25 into the soil using the indicator rod 35, and then manually return the drilling mechanism 2 to its initial position.

[0061] At this time, the penetration depth of the drill bit 25 can be recorded by the indicator rod 35 connected to the bottom of the piston plate 32. Then, the cylinder 21 is manually energized. As the telescopic rod 22 is fully retracted, the push rod 58 will push the slide rod 54 downward, so that the block 52 cannot block the liquid inlet pipe 51 until the telescopic rod 22 is fully retracted. At this time, the depth of the drill bit 25 with color is recorded again. Then, the thickness of the asphalt pavement is obtained by subtracting the depth of penetration from the depth of penetration. The operation is simple and quick, the measurement accuracy is high, and no investment in external measuring equipment is required, which reduces the burden on personnel and improves the measurement efficiency.

[0062] During this process, since the liquid inlet pipe 51 is no longer blocked by the block 52, the acid and alkali reagents in the liquid tank 510 will enter the piston cylinder 31 through the bellows 59 and the liquid inlet pipe 51. The bonding plate 41 and the piston plate 32 will slide downward as the liquid enters until the positioning head 44 is reinserted into the positioning groove 43. At this time, the piston plate 32 will continue to slide downward, allowing external gas to enter the piston cylinder 31 through the air inlet 38, which is convenient for measuring the next point.

[0063] Step 5: Record the depth of the colored area of ​​drill bit 25 again, and then subtract the colored depth from the depth of penetration to obtain the thickness of the asphalt pavement.

[0064] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A pavement thickness detection device for highway engineering, comprising a fixing frame (1), characterized in that, A drilling mechanism (2) is installed in the middle of the fixing frame (1), and the drilling mechanism (2) is used to drill holes in the asphalt pavement. Also includes: Piston mechanism (3), which is mounted on drilling mechanism (2) and performs piston movement when drilling mechanism (2) moves up and down; A venting mechanism (4) is installed inside the piston mechanism (3) and is used to blow gas into the piston mechanism (3); Release mechanism (5), which is installed on drilling mechanism (2) and is used to control the stop of drilling mechanism (2) and the liquid flow of piston mechanism (3); The drilling mechanism (2) includes a cylinder (21) mounted on the top of the fixed frame (1). The output end of the cylinder (21) is fixedly connected to a telescopic rod (22). The bottom of the telescopic rod (22) is fixedly connected to a connecting plate (23). A motor (24) is installed at the bottom center of the connecting plate (23). A drill bit (25) is installed at the output end of the motor (24). The piston mechanism (3) includes a piston cylinder (31) installed at the bottom of the connecting plate (23). A piston plate (32) is slidably connected to the inner wall of the piston cylinder (31). A groove (33) is provided on the outer wall of the piston plate (32). An insertion groove (34) is provided on the top of the piston plate (32). An indicator rod (35) is fixedly connected to the bottom of the piston plate (32). A floor plate (36) is fixedly connected to the bottom of the indicator rod (35). An injection hole (37) is provided on the inner wall of the floor plate (36). An air inlet hole (38) is provided on the outer wall of the piston cylinder (31). The venting mechanism (4) includes a bonding plate (41) that is slidably connected to the inner wall of the piston cylinder (31). A plug (42) is fixedly connected to the bottom center of the bonding plate (41). A positioning groove (43) is provided on the outer wall of the bonding plate (41). A positioning head (44) is attached to the inner wall of the positioning groove (43). A positioning spring (45) is fixedly connected to the end of the positioning head (44) away from the positioning groove (43).

2. The pavement thickness detection device for highway engineering according to claim 1, characterized in that, The release mechanism (5) includes an inlet pipe (51) fixedly connected to the top of the connecting plate (23), a block (52) slidably connected to the inner wall of the inlet pipe (51), a return spring (53) fixedly connected to the bottom of the block (52), a slide rod (54) fixedly connected to the top of the block (52), an electrode plate (55) fixedly connected to the outer wall of the slide rod (54), a connecting pipe (57) slidably connected to the outer wall of the slide rod (54), an electrode block (56) fixedly connected to the inner wall of the connecting pipe (57), a push rod (58) abutting the top of the slide rod (54), a corrugated pipe (59) fixedly connected to the end of the inlet pipe (51) away from the connecting plate (23), and a liquid tank (510) fixedly connected to the top of the corrugated pipe (59).

3. The pavement thickness detection device for highway engineering according to claim 1, characterized in that, The telescopic rod (22) passes through the middle of the fixed frame (1) and is fixedly connected to the fixed frame (1).

4. The pavement thickness detection device for highway engineering according to claim 1, characterized in that, The outer wall of the indicator rod (35) is slidably connected to the inner wall of the piston cylinder (31). The indicator rod (35) is connected to the insertion slot (34) and the floor plate (36). The drill bit (25) is located in the middle of the floor plate (36).

5. A pavement thickness detection device for highway engineering according to claim 1, characterized in that, The connector (42) is adapted to the connector slot (34), the outer wall of the positioning head (44) is slidably connected to the inner wall of the piston cylinder (31), and the end of the positioning spring (45) away from the positioning head (44) is fixedly connected to the inside of the side wall of the piston cylinder (31).

6. A pavement thickness detection device for highway engineering according to claim 2, characterized in that, The inlet pipe (51) is connected to the piston cylinder (31), the connecting pipe (57) is fixedly connected to the inlet pipe (51), the top of the push rod (58) is fixedly connected to the bottom of the fixing frame (1), the liquid tank (510) is fixedly connected to the top of the fixing frame (1), and the bottom of the return spring (53) is fixedly connected to the top of the connecting plate (23).

7. A method for detecting pavement thickness in highway engineering, employing the pavement thickness detection device for highway engineering as described in any one of claims 1-2, characterized in that, Includes the following steps: Step 1: Move the mounting bracket (1) to the detection position; Step 2: Start the drilling mechanism (2) to drill holes at the detection location; Step 3: After drilling is completed, start the drilling mechanism (2) to take out the drill bit (25). When the drill bit (25) just reaches above the road surface, release mechanism (5) cuts off the power to the drilling mechanism (2). Step 4: Record the depth of the drill bit (25) into the soil using the indicator rod (35), and then manually restore the drilling mechanism (2) to its initial position. Step 5: Record the depth of the colored part of the drill bit (25) again, and then subtract the depth of the colored part from the depth of penetration to obtain the thickness of the asphalt pavement.

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