A device for measuring the thickness of a roadbed

Abstract

This utility model relates to the field of measuring device technology and discloses a roadbed thickness measuring device, comprising: a sleeve, the sleeve having a square sliding cavity inside, a vertical groove on the front of the sleeve, the sliding cavity being connected to the outside of the sleeve through the vertical groove, and a scale for measurement on the front of the sleeve. The measuring device of this utility model achieves effortless pressing of the telescopic tube through a mechanical transmission structure of a rocker arm, bevel gear, and screw, solving the problems of fatigue and low efficiency caused by traditional pole measurement relying entirely on manual pressing; simultaneously, a pressure sensor monitors the pressure change of the telescopic tube in real time during pressing, and the control panel allows the operator to promptly perceive whether the telescopic tube has reached the bottom of the roadbed, effectively improving measurement accuracy and reliability; furthermore, the design of the pedal and anti-slip groove utilizes the weight of the user to ensure stable fixation of the device, further guaranteeing the accuracy of the measurement results.

Description

Technical Field

[0001] This utility model relates to the field of measuring device technology, and more specifically, to a roadbed thickness measuring device. Background Technology

[0002] The subgrade is the basic structural layer of road engineering, and its thickness directly affects the road's load-bearing capacity, service life, and driving safety. Accurate measurement of the subgrade thickness is a crucial step in ensuring project quality during road construction and quality acceptance.

[0003] Currently, the main methods for measuring subgrade thickness are drilling and spiking. Drilling requires specialized drilling rigs to collect samples from the subgrade. While this method yields relatively accurate thickness data, it suffers from drawbacks such as bulky equipment, complex operation, low efficiency, and significant damage to the subgrade structure. Furthermore, backfilling and repair are necessary after measurement, increasing construction costs. Spiking, a more commonly used and rapid on-site measurement method, typically involves an operator manually inserting a spiking rod vertically into the subgrade. The thickness is then determined by markings on the rod or by measuring the insertion depth.

[0004] However, the existing spiking measurement method has obvious technical defects: First, it relies entirely on operators to perform the pressing operation, which is labor-intensive, especially when facing roadbeds with high compaction or when there are many measurement points and a large workload. Operators are prone to fatigue, resulting in a significant reduction in measurement efficiency. Second, it is difficult for operators to perceive in real time whether the lower end of the spiking rod has reached the bottom of the roadbed. They often have to rely on experience to judge, which can easily lead to over-insertion that damages the underlying layer or under-insertion that causes measurement errors. Third, there is a lack of effective fixing devices, and the device is prone to displacement during the measurement process, which further affects the reliability of the measurement results. Utility Model Content

[0005] In order to overcome the shortcomings of the existing technology, this utility model provides a roadbed thickness measuring device, which solves the problems of high labor intensity, inconvenience of carrying and low efficiency of relocation of the existing pole measurement method.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a roadbed thickness measuring device, comprising:

[0007] A sleeve has a square sliding cavity inside. A vertical groove is formed on the front of the sleeve, and the sliding cavity communicates with the outside of the sleeve through the groove. The front of the sleeve has a measuring scale. A fixed shell is fixedly mounted at the top of the sleeve. A measuring mechanism is housed inside the fixed shell. The measuring mechanism includes a connecting rod. A guide hole is formed on the surface of the fixed shell, and the connecting rod extends into the interior of the fixed shell after passing through the guide hole. The connecting rod is rotatably connected to the fixed shell. A rocker arm is hinged to the side of the connecting rod away from the fixed shell. One end of the connecting rod, located inside the fixed housing, is connected to a screw. The screw is located in the sliding cavity of the sleeve and is rotatably connected to the sleeve. The top end of the screw passes through the inside of the fixed housing and is rotatably connected to the fixed housing. A square block adapted to the sliding cavity is threaded onto the outer surface of the screw. The square block is slidably connected to the inner wall of the sleeve. A telescopic tube is movably installed at the bottom end of the square block. Several reinforcing ribs are fixedly installed on the outer surface of the telescopic tube. A pressure sensor for monitoring pressure changes is abutted at the top end of the telescopic tube. The pressure sensor is fixedly installed inside the square block.

[0008] As a preferred embodiment of this utility model, a first bevel gear is fixedly sleeved at one end of the connecting rod located inside the fixed housing, and a second bevel gear is fixedly sleeved at the top end of the screw, with the second bevel gear meshing with the first bevel gear.

[0009] As a preferred embodiment of this utility model, a pointer is fixedly installed on the front of the square block, the pointer is slidably connected to the front of the sleeve, and the tip of the pointer points to the scale.

[0010] As a preferred embodiment of this utility model, a circular block is rotatably connected to the bottom end of the screw, and the circular block is slidably connected to the inside of the telescopic tube.

[0011] As a preferred embodiment of this utility model, a control panel is fixedly installed on the top of the fixed shell. The control panel is electrically connected to the pressure sensor. The control panel is equipped with a screen and buttons, and a buzzer is built into the control panel.

[0012] As a preferred technical solution of this utility model, the sleeve has two pedals hinged to its side wall. The two pedals are provided with anti-slip grooves on the side that is close to each other, and protrusions are provided on the side that is opposite to each other.

[0013] As a preferred embodiment of this utility model, a first magnet is fixedly installed inside the pedal, and a second magnet is attracted and engaged on the side of the first magnet near the sleeve, and the second magnet is fixedly connected to the side wall of the sleeve.

[0014] As a preferred embodiment of this utility model, a handle is provided on the side wall of the sleeve, and the handle is connected to the sleeve by screws.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. The measuring device of this utility model achieves labor-saving pressing of the telescopic tube through a mechanical transmission structure of rocker, bevel gear and screw, which significantly reduces the labor intensity of operators and solves the problem of fatigue and low efficiency caused by traditional pole measurement that relies entirely on manual pressing. At the same time, the pressure sensor monitors the pressure change of the telescopic tube in real time, and together with the control panel, the operator can timely and accurately perceive whether the telescopic tube has reached the bottom of the roadbed, reducing measurement errors caused by over-insertion or under-insertion due to experience judgment, and effectively improving measurement accuracy and reliability. In addition, the design of the pedal and anti-slip groove uses the weight of the human body to make the device stable and fixed, further ensuring the accuracy of the measurement results.

[0016] 2. The measuring device of this utility model achieves a hinged connection between the rocker arm and the connecting rod through the first hinge block, allowing the rocker arm to rotate and fold relative to the connecting rod, effectively reducing the lateral space occupied by the device; the pedal is hinged to the side wall of the sleeve through the second hinge block, and can be rotated and folded to both sides of the sleeve. At the same time, the attraction between the first magnet and the second magnet plays a fixing role in the folded pedal, preventing it from unfolding on its own during movement; the handle is detachably connected to the side wall of the sleeve by screws, making it easy for the operator to grip and lift the entire device; the combination of the above-mentioned folding and storage structure and the portable handle makes the device easy to carry and transfer, suitable for field multi-point measurement operation scenarios, effectively improving the mobility and ease of use of the equipment. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a cross-sectional structural diagram of the present invention; Figure 3 This is a cross-sectional view of the square block of this utility model; Figure 4 This is a schematic diagram of the circular block structure of this utility model; Figure 5 for Figure 2 A magnified schematic diagram of the partial structure at point A in the middle; Figure 6 This is a schematic diagram of the exploded structure of this utility model; Figure 7 This is a schematic diagram of the unfolded structure of this utility model.

[0018] In the diagram: 1. Sleeve; 2. Vertical groove; 3. Scale; 4. Fixed shell; 5. Connecting rod; 6. First hinge block; 7. Rocker arm; 8. First bevel gear; 9. Second bevel gear; 10. Screw; 11. Square block; 12. Telescopic tube; 13. Reinforcing rib; 14. Pressure sensor; 15. Moving block; 16. Round block; 17. Control panel; 18. Second hinge block; 19. Pedal; 20. Anti-slip groove; 21. Protrusion; 22. First magnet; 23. Second magnet; 24. Fixed block; 25. Handle. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] like Figures 1 to 7 As shown, this utility model provides a roadbed thickness measuring device, comprising: A sleeve 1 has a square sliding cavity inside. A vertical groove 2 is formed on the front of the sleeve 1, connecting the sliding cavity to the outside of the sleeve 1 via the groove 2. A measuring scale 3 is provided on the front of the sleeve 1. A fixed housing 4 is fixedly mounted at the top of the sleeve 1. A measuring mechanism is housed inside the fixed housing 4, including a connecting rod 5. A guide hole is formed on the surface of the fixed housing 4, through which the connecting rod 5 extends into the interior of the fixed housing 4. The connecting rod 5 is rotatably connected to the fixed housing 4. A rocker arm 7 is hinged to the side of the connecting rod 5 away from the fixed housing 4. A screw 10 is connected to the end of the connecting rod 5 inside the fixed housing 4. The screw 10 is located in the sliding cavity of the sleeve 1 and rotatably connected to the sleeve 1. The top end of the screw 10 passes through the interior of the fixed housing 4 and is rotatably connected to the fixed housing 4. The outer surface of the screw 10 is threaded... A square block 11 adapted to the sliding cavity is fitted with a sleeve. The square block 11 is slidably connected to the inner wall of the sleeve 1. A telescopic tube 12 is movably installed at the bottom end of the square block 11. Several reinforcing ribs 13 are fixedly installed on the outer surface of the telescopic tube 12. A pressure sensor 14 for monitoring pressure changes is abutted at the top end of the telescopic tube 12. The pressure sensor 14 is fixedly installed inside the square block 11. Specifically, a first hinge block 6 is fixedly installed on the side of the connecting rod 5 away from the fixed shell 4. The rocker arm 7 is rotatably connected to the first hinge block 6. A first bevel gear 8 is fixedly fitted at the end of the connecting rod 5 inside the fixed shell 4. A second bevel gear 9 is fixedly fitted at the top end of the screw 10. The second bevel gear 9 meshes with the first bevel gear 8. An arc-shaped groove adapted to the top end of the telescopic tube 12 is opened at the bottom end of the square block 11. The top end of the telescopic tube 12 is movably inserted into the inside of the arc-shaped groove.

[0021] More specifically, the sleeve 1 serves as the main load-bearing structure of the device. Its internal square sliding cavity provides circumferential limiting and guidance for the vertical movement of the square block 11, preventing the square block 11 from circumferentially deflecting as the screw 10 rotates, thus ensuring the coaxiality and stability of the vertical feed. The vertical groove 2 on the front of the sleeve 1 provides adaptation space for the subsequent synchronous movement of the pointer. The scale 3 provides a precise calibration benchmark for the intuitive reading of the roadbed thickness. The fixed shell 4 provides closed protection and stable installation support for the internal transmission components. The rocker arm 7, the first hinge block 6, and the connecting rod 5 work together to provide the operator with a labor-saving rotating operating end. The telescopic tube 12 can be fed without manual pressing, which greatly reduces the intensity of operation and improves the convenience of measurement operation. The horizontal rotation power of the connecting rod 5 is reversed and transmitted to the screw 10 through the bevel gear transmission pair composed of the first bevel gear 8 and the second bevel gear 9, so as to achieve stable and efficient output of vertical feeding power. By using the threaded transmission cooperation between the screw 10 and the square block 11, the rotational motion of the screw 10 is accurately converted into the vertical linear motion of the square block 11, thereby driving the telescopic tube 12 to be smoothly and uniformly fed vertically into the roadbed. This avoids problems such as uneven force, feeding jamming, and insertion rod tilting caused by manual pressing, and ensures the stability of the measurement process and the accuracy of the measurement results. The reinforcing ribs 13 on the outer surface of the telescopic tube 12 can effectively improve the structural strength and bending resistance of the telescopic tube 12, prevent deformation and damage during the insertion and compaction of the roadbed, and ensure the smoothness of the insertion operation. The pressure sensor 14 inside the square block 11 can monitor the pressure change at the top of the telescopic tube 12 in real time, providing accurate detection basis for identifying the roadbed sub-layer interface and judging the insertion endpoint. Operators do not need to judge the insertion depth by touch, further improving the convenience of measurement operation and the reliability of measurement results.

[0022] The square block 11 has a pointer fixedly installed on its front side. The pointer is slidably connected to the front side of the sleeve 1, and the tip of the pointer points to the scale 3. Specifically, the square block 11 has a moving block 15 fixedly installed on its front side. The pointer is fixedly installed at the front end of the moving block 15, and the moving block 15 is slidably connected to the inside of the vertical groove 2.

[0023] More specifically, the pointer slides along the vertical groove 2 synchronously with the vertical feed of the square block 11 via the moving block 15, which is fixedly connected to the square block 11. This ensures a precise one-to-one correspondence between the pointer's position and the insertion depth of the telescopic tube 12. Simultaneously, the vertical groove 2 limits and constrains the moving block 15, further enhancing the stability of the vertical movement of the square block 11 and preventing it from deflecting. The pointer tip points to the scale 3, allowing the operator to intuitively and quickly read the current insertion depth of the telescopic tube 12 and directly obtain the measurement result of the roadbed thickness without additional calculations, greatly improving the convenience and reading efficiency of the measurement operation.

[0024] The bottom end of the screw 10 is rotatably connected to a circular block 16, which is slidably connected to the inside of the telescopic tube 12. Specifically, the circular block 16 can prevent the screw 10 from directly contacting the soil and rock medium in the roadbed, preventing the soil and rock medium from affecting the rotation of the screw 10. The circular block 16 can also act as a barrier to the soil. When the telescopic tube 12 is pulled upward, it can block the soil inside the telescopic tube 12, keeping the soil in the roadbed and reducing damage to the roadbed.

[0025] The top of the fixed housing 4 is fixedly equipped with a control panel 17, which is electrically connected to the pressure sensor 14. The control panel 17 is equipped with a screen and buttons, and has a built-in buzzer. Specifically, the control panel 17 provides the operator with a visual operation and data reading interface. It can receive, process and display pressure detection data in real time through electrical connection with the pressure sensor 14, allowing the operator to intuitively grasp the pressure changes during the insertion of the telescopic tube 12. The built-in buzzer can automatically trigger an alarm when the pressure data changes abruptly or when the subgrade interface is detected, eliminating the need for the operator to continuously monitor the data, further reducing the difficulty of operation and improving the convenience of measurement operation.

[0026] Among them, the side wall of the sleeve 1 is hinged with two pedals 19. The two pedals 19 are provided with anti-slip grooves 20 on the side that is close to each other, and the two pedals 19 are provided with protrusions 21 on the side that is opposite to each other. Specifically, the side wall of the sleeve 1 is fixedly installed with a second hinge block 18, and the pedals 19 are rotatably connected to the second hinge block 18.

[0027] More specifically, because the second hinge block 18 enables the hinged engagement between the pedal 19 and the sleeve 1, the pedal 19 can be flexibly rotated, unfolded, and stored. After unfolding, the pedal 19 allows the operator to use it to counterweight and fix the entire device by stepping on it, preventing vertical movement, horizontal shift, or tilting of the device during measurement. This ensures that the device remains vertical during measurement operations, improving the accuracy of the measurement results. The anti-slip groove 20 on the pedal 19 increases the friction between the pedal 19 and the operator's shoes, preventing slippage during stepping and improving operational safety. The protrusion 21 at the bottom of the pedal 19 increases the gripping force between the pedal 19 and the ground, further improving the stability of the device after it is fixed, reducing the difficulty of fixing the device for the operator, and improving the convenience of the measurement operation.

[0028] The pedal 19 has a first magnet 22 fixedly installed inside. The first magnet 22 is attracted to a second magnet 23 on the side of the sleeve 1. The second magnet 23 is fixedly connected to the side wall of the sleeve 1. Specifically, the side wall of the sleeve 1 has a fixing block 24 fixedly installed, and the second magnet 23 is fixedly sleeved inside the fixing block 24.

[0029] More specifically, the fixing block 24 provides stable installation support for the second magnet 23. Through the adsorption and cooperation between the first magnet 22 inside the pedal 19 and the second magnet 23 on the sleeve 1, the pedal 19 can be adsorbed and fixed when it is stored and folded, which improves the convenience of using the device.

[0030] The sleeve 1 has a handle 25 on its side wall. The handle 25 is connected to the sleeve 1 by screws. Specifically, the handle 25, which is fixed to the side wall of the sleeve 1 by screws, provides the operator with a stable grip and force application part, making it convenient for the operator to carry, transfer and align the measurement points of the device. The device can be moved and placed without holding the main body of the sleeve 1, which further improves the convenience of the device's use and operation.

[0031] Working principle and usage process of this utility model: First, the operator can lift the entire device by holding the handle 25, allowing a single person to complete the transfer and movement of the device to the measurement point on the roadbed. After moving to the target measurement location, the operator places the sleeve 1 vertically on the ground and makes the round block 16 at the bottom of the screw 10 fit against the ground reference surface. Then, the operator turns the two pedals 19 one after the other, causing the two pedals 19 to rotate and unfold around the corresponding second hinge block 18 as the axis, until the opposite sides of the two pedals 19 are completely in contact with the ground during rotation. At this time, the operator steps on the two pedals 19 with both feet, which has a stabilizing and counterweighting effect on the entire device. Due to the design of the anti-slip groove 20 on the surface of the pedal 19, the friction between the pedal 19 and the operator's shoes can be effectively increased. At the same time, the design of the protrusion 21 at the bottom of the pedal 19 can greatly improve the biting force between the pedal 19 and the ground, thereby further improving the stability of the device after it is fixed. After the device is fixed, the operator moves the rocker arm 7, causing it to rotate around the first hinge block 6. Once the rocker arm 7 has rotated 90 degrees and is fully extended, the operator holds it and shakes it circumferentially. At this time, the rocker arm 7 will drive the connecting rod 5 to rotate via the first hinge block 6. Simultaneously, the first bevel gear 8 will rotate with the connecting rod 5 inside the fixed housing 4. Since the outer surface of the first bevel gear 8 meshes with the outer surface of the second bevel gear 9, the first bevel gear 8 will reverse the power through the second bevel gear 9, thereby driving the screw 10 to rotate synchronously circumferentially. Furthermore, since the outer surface of the screw 10 is threaded into the internal part of the square block 11, and the square block 11 is connected to the square sliding cavity inside the sleeve 1... The inner wall is slidably connected, and the sliding cavity forms a circumferential limit on the square block 11. Therefore, when the screw 10 rotates, it will drive the square block 11 to move smoothly vertically downward along the inner wall of the sliding cavity. At the same time, the telescopic tube 12 and the reinforcing ribs 13 on its outer surface will move downward synchronously under the drive of the square block 11. The square block 11 will drive the pointer at the front end to slide downward synchronously through the moving block 15. At this time, the telescopic tube 12 will be smoothly inserted into the roadbed to be tested during the downward feeding process. During this insertion process, the top of the telescopic tube 12 will continuously apply axial pressure to the pressure sensor 14 installed inside the square block 11. The pressure sensor 14 will collect pressure data in real time and transmit it to the control panel 17, and display it intuitively on the screen of the control panel 17. Due to the design of the reinforcing ribs 13 on the outer surface of the telescopic tube 12, the structural strength and bending resistance of the telescopic tube 12 can be effectively improved, avoiding deformation and damage during insertion into the high-density subgrade, and ensuring the smoothness of the insertion operation. When the telescopic tube 12 is fed downward to the subgrade layer interface, due to the significant difference in density and hardness between the subgrade layer medium and the subgrade filler, if the subgrade layer is a low-density underlying soil layer, the pressure value collected by the pressure sensor 14 will immediately decrease. If the subgrade layer is a high-hardness sand and gravel bearing layer, the pressure value collected by the pressure sensor 14 will immediately increase. At this time, the buzzer built into the control panel 17 will immediately trigger an alarm to remind the operator to stop shaking the rocker arm 7. Then the operator can directly check the scale 3 pointed to by the pointer tip to accurately read the effective insertion depth of the telescopic tube 12, thereby completing the measurement of the subgrade thickness at the test point. After completing the measurement work, the operator reverses the rocker arm 7, which in turn drives the square block 11 and the telescopic tube 12 to move vertically upwards synchronously, allowing the telescopic tube 12 to be smoothly pulled out of the roadbed. Due to the design of the round block 16, it can block the soil carried inside the telescopic tube 12 when it moves upwards, so that the soil will not be carried upwards with the telescopic tube 12 and will always remain inside the roadbed, thereby reducing damage to the roadbed structure and reducing the amount of subsequent backfilling and repair work. After the telescopic tube 12 is completely retracted into the sleeve 1, the operator reverses the rocker arm 7 and the two pedals 19, so that the rocker arm 7 and the pedals 19 are restored to the folded storage state. Since the first magnet 22 inside the pedal 19 and the second magnet 23 inside the fixing block 24 on the side wall of the sleeve 1 attract and cooperate with each other, they can stabilize and fix the pedal 19 after storage, preventing it from shaking or unfolding on its own after storage, thereby reducing the overall volume of the device after storage and facilitating the subsequent transportation and storage by the operator.

[0032] 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.

[0033] Although embodiments of the present 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 present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for measuring the thickness of a roadbed, characterized in that, The device includes: a sleeve (1), which has a square sliding cavity inside and a vertical groove (2) on the front side of the sleeve (1). The sliding cavity is connected to the outside of the sleeve (1) through the vertical groove (2). The front side of the sleeve (1) is provided with a scale (3) for measurement. A fixed shell (4) is fixedly installed at the top of the sleeve (1). A measuring mechanism is provided inside the fixed shell (4). The measuring mechanism includes a connecting rod (5). A guide hole is provided on the surface of the fixed shell (4). The connecting rod (5) passes through the guide hole on the surface of the fixed shell (4) and extends into the interior of the fixed shell (4). The connecting rod (5) is rotatably connected to the fixed shell (4). The side of the connecting rod (5) away from the fixed shell (4) is hinged. There is a rocker arm (7), and the connecting rod (5) is connected to a screw (10) at one end inside the fixed shell (4). The screw (10) is located in the sliding cavity of the sleeve (1) and is rotatably connected to the sleeve (1). The top end of the screw (10) passes through the inside of the fixed shell (4) and is rotatably connected to the fixed shell (4). The outer surface of the screw (10) is threaded with a square block (11) that is adapted to the sliding cavity. The square block (11) is slidably connected to the inner wall of the sleeve (1). The bottom end of the square block (11) is movably installed with a telescopic tube (12), and the top end of the telescopic tube (12) abuts against a pressure sensor (14) for monitoring pressure changes. The pressure sensor (14) is fixedly installed inside the square block (11).

2. A device for measuring the thickness of a roadbed according to claim 1, wherein: The first bevel gear (8) is fixedly sleeved at one end of the connecting rod (5) inside the fixed shell (4), and the second bevel gear (9) is fixedly sleeved at the top end of the screw (10), and the second bevel gear (9) meshes with the first bevel gear (8).

3. The roadbed thickness measuring device of claim 1, wherein: A pointer is fixedly installed on the front of the square block (11), the pointer is slidably connected to the front of the sleeve (1), and the tip of the pointer points to the scale (3).

4. The roadbed thickness measuring device of claim 1, wherein: The bottom end of the screw (10) is rotatably connected to a round block (16), and the round block (16) is slidably connected to the inside of the telescopic tube (12).

5. The roadbed thickness measuring device of claim 1, wherein: A control panel (17) is fixedly installed on the top of the fixed shell (4). The control panel (17) is electrically connected to the pressure sensor (14). The control panel (17) is equipped with a screen and buttons, and a buzzer is built into the control panel (17).

6. The roadbed thickness measuring device of claim 1, wherein: The sleeve (1) has two pedals (19) hinged to its side wall. The two pedals (19) are provided with anti-slip grooves (20) on the side that is close to each other, and protrusions (21) are provided on the side that is opposite to each other.

7. A device for measuring the thickness of a roadbed as claimed in claim 6, wherein: The pedal (19) is fixedly installed with a first magnet (22), and a second magnet (23) is attracted and matched on the side of the first magnet (22) near the sleeve (1). The second magnet (23) is fixedly connected to the side wall of the sleeve (1).

8. The roadbed thickness measuring device of claim 1, wherein: The sleeve (1) is provided with a handle (25) on its side wall, and the handle (25) is connected to the sleeve (1) by screws.

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