Plug-in thickness detector and asphalt layer thickness detection method

Abstract

The invention provides a plug-in thickness detector and an asphalt layer thickness detection method. The detector comprises a main support rod; the sliding ring is slidably arranged on the main supporting rod in a sleeving mode. One end of the plug pin is connected with the sliding ring, and the other end serves as an insertion end; the sliding ring locking piece is arranged on the main supporting rod. The sliding ring can be locked on the main supporting rod through the sliding ring locking piece, and the main supporting rod is pressed downwards until the inserting end of the inserting nail is inserted into the lower surface of the layer to be tested; after the inserting end of the inserting nail is inserted into the lower surface of the to-be-measured layer, locking between the sliding ring and the main supporting rod is relieved, the main supporting rod moves towards the to-be-measured layer relative to the inserting nail and the sliding ring till the supporting bottom plate abuts against the upper surface of the to-be-measured layer, and the thickness of the to-be-measured layer is determined based on the relative movement between the main supporting rod and the sliding ring. By adopting plug-in detection, a large amount of labor cost is saved; a tedious and strenuous measurement process is simplified into a simple insertion action.

Description

Technical Field

[0001] This invention relates to the field of thickness detection technology, and more specifically, to an insertion-type thickness gauge and a method for detecting the thickness of asphalt layers. Background Technology

[0002] Asphalt pavement is composed of multiple layers of materials. During asphalt pavement paving construction, the thickness of each paving layer is a key indicator for measuring construction quality, controlling material usage, and ensuring road service life. Because each layer of asphalt pavement has strict thickness requirements, construction specifications require frequent, multi-point spot checks of the paving thickness, which places a significant workload on site. Currently, the three main methods commonly used for on-site thickness testing are as follows: 1. Nail Insertion Method: The operator inserts a thin, long nail into the uncooled asphalt mixture until it feels like it has reached the underlying structure. Then, the nail is pulled out, and the length of the asphalt-soaked portion of the nail is measured with a steel tape measure. This method has significant drawbacks: measuring the soaked length after pulling it out is inaccurate due to the asphalt sticking together and the blurred boundaries; moreover, the operation is cumbersome and inefficient.

[0003] 2. Pit Measurement Method: A pit is dug into the leveled asphalt layer down to the base layer. A straight rod or board is then placed on the asphalt surface, and the distance from the bottom of the rod or board to the bottom of the pit (base layer) is measured with a ruler to determine the paving thickness. Although this method has relatively high measurement accuracy, it is time-consuming and labor-intensive, and it can damage the asphalt paving layer. It is only suitable for small-scale sampling and cannot meet the needs of large-area, rapid testing. Both pit digging and filling increase construction costs.

[0004] 3. Core sampling method: This method is mainly used for physical testing after asphalt compaction. Core sampling is costly and can cause permanent damage to the road. Construction units generally use the above two methods for process control to reduce the need for core sampling physical testing. Summary of the Invention

[0005] In view of this, the present invention proposes an insertion-type thickness gauge and a method for detecting the thickness of asphalt layers, aiming to solve the problems of cumbersome operation and low efficiency of existing thickness detection methods.

[0006] On one hand, the present invention proposes an insertion-type thickness gauge, which includes: a main support rod with a support base plate at its bottom for supporting the upper surface of the layer to be measured; a sliding ring slidably sleeved on the main support rod; a pin, one end of which is connected to the sliding ring and the other end of which serves as an insertion end for insertion into the layer to be measured until it reaches the lower surface of the layer to be measured; and a sliding ring locking member disposed on the main support rod for locking the sliding ring on the main support rod. By pressing down on the main support rod, the sliding ring and the pin are pressed down until the insertion end of the pin reaches the lower surface of the layer to be measured. After the insertion end of the pin reaches the lower surface of the layer to be measured, the locking between the sliding ring and the main support rod is released, allowing the main support rod to move relative to the pin toward the layer to be measured until the support base plate abuts against the upper surface of the layer to be measured. The thickness of the layer to be measured is determined based on the relative movement between the main support rod and the sliding ring.

[0007] Furthermore, in the aforementioned insertion-type thickness gauge, the slip ring locking component is connected to an unlocking drive assembly. The operation input end of the unlocking drive assembly is located at the top of the main support component, and is used for manual operation to release the lock between the slip ring and the main support rod.

[0008] Furthermore, in the aforementioned insertion-type thickness detector, the unlocking drive assembly includes: a scissor frame, the first end of which is connected to the slip ring locking member, and the second end of which is connected to an unlocking control member for pulling the scissor frame to fold, thereby causing the slip ring locking member to retract and unlocking the slip ring and the main support rod; and a first force-applying spring, which is disposed at the second end of the scissor frame for applying a reset force to the scissor frame to reset the scissor frame to the open state.

[0009] Furthermore, in the aforementioned insert-type thickness detector, the unlocking control component includes: a force handle, disposed at the top of the main support rod; and a brake connecting rope, with its two ends connected to the force handle and the first end of the scissor frame, respectively, for pulling the scissor frame to fold under the action of the force handle.

[0010] Furthermore, in the aforementioned insertion-type thickness gauge, the slip ring locking component consists of two resistance buckles, which are radially oppositely disposed on the main support rod. Each resistance buckle is slidably inserted into the side wall of the main support rod along the radial direction of the main support rod, and is used to protrude outward from the main support rod to limit the top of the slip ring, so that the slip ring is locked between the resistance buckle and the support base plate.

[0011] Furthermore, in the aforementioned insertion-type thickness detector, the sliding ring is provided with a sliding guide groove, which is used to guide the sliding ring as it slides downward relative to the resistance buckle, so that the sliding ring can move downward under the action of gravity and pass through the resistance buckle, sliding between the resistance buckle and the support base plate; the distance between the resistance buckle and the support base plate is adapted to the height of the sliding ring.

[0012] Furthermore, in the aforementioned insertion-type thickness gauge, the main support rod is equipped with a scale for marking the height position of the sliding ring relative to the main support rod.

[0013] Furthermore, in the aforementioned insertion-type thickness gauge, the scale is slidably mounted on the main support rod along its length direction. This scale is used to adjust the zero position of the scale to the height of the sliding ring when the insertion end of the pin is flush with the bottom wall of the support base plate, thereby achieving zeroing.

[0014] Furthermore, in the aforementioned insertion-type thickness gauge, the scale is equipped with a scale locking component, which is used to lock the scale to the main support rod after the scale is zeroed and adjusted.

[0015] On the other hand, the present invention also proposes a method for detecting the thickness of an asphalt layer. This method uses the aforementioned insertion-type thickness gauge and includes the following steps: locking the sliding ring to the main support rod using the slip ring locking member of the insertion-type thickness gauge to form a fixed structure; inserting the fixed structure perpendicular to the surface of the layer to be tested and vertically downward into the layer to be tested until the insertion end of the pin reaches the lower surface of the layer to be tested; releasing the locking between the sliding ring and the main support rod using the slip ring locking member of the insertion-type thickness gauge, and pressing down the main support rod to allow it to slide downward relative to the pin until the support base plate presses against the upper surface of the layer to be tested; determining the thickness of the layer to be tested based on the distance the main support rod slides relative to the pin.

[0016] The insertion-type thickness gauge and asphalt layer thickness detection method provided by this invention can lock the sliding ring to the main support rod through a sliding ring locking device. By pressing down the main support rod, the sliding ring and the insert pin are pressed down until the insertion end of the insert pin is inserted into the lower surface of the layer to be tested. After the insertion end of the insert pin is inserted into the lower surface of the layer to be tested, the locking between the sliding ring and the main support rod is released. The main support rod moves relative to the insert pin and the sliding ring towards the layer to be tested until the support base plate abuts against the upper surface of the layer to be tested. The thickness of the layer to be tested is determined based on the relative movement between the main support rod and the sliding ring. The insertion-type detection method will not cause damage to the asphalt paving layer, avoids the detection method of "one person testing and a team of people cooperating", and saves a lot of labor costs. Moreover, it simplifies the cumbersome and laborious measurement process into a simple insertion action, which significantly reduces the labor intensity of the testing personnel. In addition, the instrument needs to be inserted vertically into the asphalt layer (the object being tested), and the paving thickness can be directly read through the scale on the main support rod. The operation is simple and does not require complicated operations or additional measuring tools (such as a measuring tape), thus lowering the operational threshold. The design of the nail contacting the base layer first and then the main support rod contacting the asphalt surface avoids the error of human judgment of insertion depth in the "iron nail insertion method", ensuring accurate measurement. The testing process is fast, and multiple points can be checked in a short time, meeting the testing frequency requirements of large-area paving construction and improving measurement efficiency. Attached Figure Description

[0017] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 This is a front view of the insertion thickness gauge provided in an embodiment of the present invention; Figure 2 This is a side view of the insertion thickness measuring instrument provided in an embodiment of the present invention; Figure 3 for Figure 2 A magnified view of a section at point A in the middle; Figure 4 for Figure 2 A magnified view of a section at point B in the middle; Figure 5 This is a top sectional view of the insertion thickness gauge provided in an embodiment of the present invention; Figure 6 This is a schematic diagram of the internal structure of the insertion thickness detector provided in an embodiment of the present invention; Figure 7 This is a schematic diagram of the structure of the insertion thickness gauge when it is zeroed according to an embodiment of the present invention; Figure 8This is a schematic diagram of the structure of the insertion thickness gauge in place according to an embodiment of the present invention; Figure 9 This is a schematic diagram of the structure of the insertion thickness gauge when the measuring pin is inserted into place, as provided in an embodiment of the present invention. Figure 10 This is a schematic diagram of the structure of the insertion thickness gauge provided in an embodiment of the present invention when the measurement is completed; Figure 11 A flowchart illustrating the asphalt layer thickness detection method provided in an embodiment of the present invention; Explanation of reference numerals in the attached figures: 1-Main support rod, 11-Holding part, 12-Support base, 13-Scale groove, 2-Support base plate, 3-Sliding ring, 31-Second force-applying spring, 4-Pin, 5-Sliding ring locking part, 6-Scale ruler, 7-Scale locking part, 8-Unlocking drive assembly, 81-Scissors frame, 82-First force-applying spring, 83-Unlocking control part, 831-Control handle, 832-Brake connecting rope, 9-Test layer, 10-Hard lower support layer. Detailed Implementation

[0018] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the disclosure to those skilled in the art. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0019] See Figures 1 to 6 The figure illustrates a preferred structure of the insertion-type thickness gauge provided in an embodiment of the present invention. As shown, the insertion-type thickness gauge includes: a main support rod 1, a support base plate 2, a sliding ring 3, a pin 4, a sliding ring locking element 5, a scale 6, and a scale locking element 7; wherein, The main support rod 1 has a support base plate 2 at its bottom, which is used to support the upper surface of the layer to be tested 9. Specifically, the main support rod 1, as the core support structure of the whole, uses a hollow round rod structure and can be made of metal (such as stainless steel, aluminum alloy) or high-strength composite material to ensure sufficient rigidity and durability. In this embodiment, the upper end of the main support rod 1 (relative to the top of the test layer 9) is a hollow round rod structure, which can be made of metal (such as stainless steel, aluminum alloy) or high-strength composite material to ensure sufficient rigidity and durability. Figure 1(As shown in the diagram) A grip 11 is provided for easy movement. The grip 11 can be designed with anti-slip texture, a rubber sleeve, or an L-shaped handle. A support base 12 can be provided at the lower end of the main support rod 1. The cross-section of the support base 12 is larger than that of the main support rod 1, thus allowing for a larger area to bear the downward impact of the sliding ring 3. In this embodiment, a support base plate 2 can be provided at the bottom of the main support rod 1. The support base plate 2 can be fixedly connected to the support base 12. The bottom of the support base plate 2 is flat, and this surface contacts and rests on the upper surface of the measured substance during measurement, increasing the contact area and improving the accuracy and stability of the instrument. The support base plate 2 can be made of plastic or other materials; no limitation is made in this embodiment.

[0020] The sliding ring 3 is slidably fitted onto the main support rod 1. Specifically, the sliding ring 3 is used to connect the pin 4 and the main support rod 1, serving to transmit the thickness of the measured object. The sliding ring 3 wraps around the main support rod 1, and the sliding ring 3 has a tongue and groove inside. The outer wall of the main support rod 1 has a sliding guide groove adapted to the tongue and groove. The sliding guide groove is arranged along the height direction of the main support rod 1. The tongue and groove are slidably set in the sliding guide groove so that the sliding ring 3 can move up and down along the sliding guide groove of the main support rod 1. The sliding guide groove restricts the rotation of the pin 4, allowing only its axial movement. In this embodiment, one end of the sliding ring 3 (e.g., Figure 4 The square extension (shown on the right end) has a screw hole at its tip for connecting the pin 4. The sliding ring 3 has a locking guide groove on its inner bottom wall, allowing it to slide through the sliding ring locking member 5 to its lower side as it slides from top to bottom. This locking guide groove, located vertically within the sliding ring locking member 5, allows the sliding ring 3 to pass through the groove under gravity, resulting in unidirectional movement after use. If gravitational potential energy is insufficient, the sliding ring 3 can be manually controlled to return to its original position. A support limiting member can be provided at the top, which can limit the top of the sliding ring 3 via the sliding ring locking member 5.

[0021] One end of pin 4 (e.g.) Figure 4 The top end (as shown) is connected to the sliding ring 3, and the other end (as shown) Figure 4The bottom end (as shown) serves as the insertion end, inserted into the layer to be tested 9 until it reaches the lower surface of the layer to be tested 9, i.e., the upper surface of the hard underlying layer 10. Specifically, the top end of the pin is connected to the square connecting plate of the sliding ring 3 by bolts, and can move up and down with the sliding ring 3, so that the thickness of the layer to be tested 9 can be measured by its up and down movement relative to the main support rod 1. Among them, the pin 4 is the component that actually penetrates the layer to be tested 9, such as the asphalt layer, until it reaches the hard underlying layer 10 (such as the base layer), and its length exceeds the bottom plate of the main support rod 1 when not in use. In this embodiment, the pin can be a telescopic adjustment rod, or it can be detachably connected to the sliding ring 3 to select a pin of appropriate length for measuring the thickness of the layer to be tested 9.

[0022] The slip ring locking component 5 is mounted on the main support rod 1 to lock the slip ring 3 onto the main support rod 1. By pressing down the main support rod 1, the slip ring 3 and the insert pin 4 are pressed down until the insertion end of the insert pin 4 is inserted into the lower surface of the layer to be tested 9 (e.g., ...). Figure 9 (As shown), and after the insertion end of the pin 4 is inserted to the lower surface of the layer 9 to be tested, the locking between the sliding ring 3 and the main support rod 1 is released, so that the main support rod 1 moves relative to the pin 4 toward the layer 9 to be tested until the support base plate 2 abuts against the upper surface of the layer 9 to be tested (as shown). Figure 10 As shown in the figure, the thickness of the layer 9 to be measured is determined based on the relative movement between the main support rod 1 and the sliding ring 3.

[0023] Specifically, the slip ring locking member 5 can lock the slip ring 3 onto the main support rod 1. When the pin 45 is inserted, it is necessary to prevent the pin 4 and the slip ring 3 from rebounding along the sliding guide groove, so that it has sufficient force to insert into the measured material. In this embodiment, the slip ring locking member 5 can be connected to an unlocking drive assembly 8. The operation input end of the unlocking drive assembly is located at the top of the main support member, and is used for manual operation to release the lock between the slip ring 3 and the main support rod 1, thereby allowing the slip ring 3 to slide relative to the main support rod 1 to realize the measurement of the thickness of the layer 9 to be measured. The lower part of the grip 11 cooperates with the operation input end of the unlocking drive assembly 8, and can be designed and fixed with reference to the principle of bicycle handlebars. In this embodiment, the slip ring locking member 5 can be provided with a second force-applying spring 31, which is used to apply a reset force to the slip ring locking member 5 so that the slip ring locking member 5 resets to the locked state, that is, it is in the locked state in the free state, so that the slip ring 3 can be fixed for a long time without moving up and down.

[0024] In this embodiment, the slip ring locking element 5 can be two resistance buckles, which are located radially along the main support rod 1 (e.g., Figure 4The resistance buckles (as shown in the horizontal direction) are arranged opposite each other on the main support rod 1, and each resistance buckle is slidably inserted into the side wall of the main support rod 1 along the radial direction of the main support rod 1. They protrude outwards from the main support rod 1 to limit the top of the sliding ring 3, so that the sliding ring 3 is locked between the resistance buckle and the support base plate 2. Specifically, the main support rod 1 has a horizontal channel inside, with the upper part of the channel hollowed out to reserve space for the retraction line of the resistance buckle. The second force-applying spring 31 is arranged between the two resistance buckles, with both ends connected to the two resistance buckles respectively, allowing the two resistance buckles to be in a normally extended state, that is, protruding outwards from the main support rod 1, achieving locking and limiting.

[0025] In this embodiment, the sliding ring is provided with a sliding guide groove, which guides the sliding ring as it slides downward relative to the resistance buckle, allowing the sliding ring to move downward under gravity and pass through the resistance buckle, sliding between the resistance buckle and the supporting base plate. Specifically, the sliding guide groove can be an inclined groove structure and is provided on the inner wall of the sliding ring, arranged inclined from the top to the outer periphery, forming a ⊿-shaped groove. In this way, the sliding ring can pass through the resistance buckle 3 under gravity, so that the sliding ring forms a unidirectional movement after use. If the gravitational potential energy is insufficient, the control force 3 can be manually controlled to return the sliding ring to its original position.

[0026] Of course, the slip ring locking component 5 can also be other locking components, and no limitation is made to it in this embodiment. The slip ring locking component 5 can lock the sliding ring 3 and the main support rod 1 to ensure that the probe can be inserted into the layer to be tested 9. By unlocking the slip ring locking component 5, the main support rod 1 can move up and down relative to the sliding ring 3 and the probe, so as to determine the thickness of the layer to be tested 9 by the relative movement distance between the main support rod 1 and the sliding ring 3. In this embodiment, the distance between the resistance buckle and the support base plate 2 is adapted to the height of the sliding ring 3 so that the sliding ring 3 is locked up and down between the resistance buckle and the support base plate 2.

[0027] In this embodiment, a scale 6 is provided on the main support rod 1 to mark the height position of the sliding ring 3 relative to the main support rod 1, especially to mark the position when the bottom end of the pin is flush with the bottom wall of the support base plate 2 (e.g. Figure 7 (as shown in the image) and when the bottom end of the probe is inserted to the lower surface of the layer 9 to be tested and the bottom wall of the support base plate 2 abuts against the upper surface of the layer 9 to be tested (e.g.) Figure 10 The height position of the sliding ring 3 (as shown) is used to determine the thickness of the layer 9 to be measured based on the two height differences.

[0028] Specifically, the scale 6 is slidably mounted on the main support rod 1 along its length. It is used to adjust the zero position of the scale 6 to the height of the sliding ring 3 when the insertion end of the pin 4 is flush with the bottom wall of the support base plate 2. The scale 6 increases sequentially from top to bottom and can be zeroed by sliding. This facilitates reading when the bottom end of the pin is inserted into the lower surface of the layer 9 to be tested and the bottom wall of the support base plate 2 is against the upper surface of the layer 9 to be tested (e.g., when the pin is inserted into the lower surface of the layer 9 to be tested and the bottom wall of the support base plate 2 is against the upper surface of the layer 9 to be tested). Figure 10 The height of the sliding ring 3 (as shown) indicates the thickness of the layer 9 to be measured. The main support rod 1 may have a graduated groove 13, which is slightly recessed relative to the surface of the main support rod 1 to prevent the sliding ring 3 from moving and damaging the scale. The scale 6 can move up and down within the reserved slot. In this embodiment, the scale 6 is equipped with a scale locking component 7, used to lock the scale 6 to the main support rod 1 after zeroing adjustment. In this embodiment, the scale locking component 7 can be a bolt. After the scale 6 moves to the correct position, the bolt can be tightened to fix the position of the scale 6, especially when the bottom wall of the support base plate 2 and the tip of the pin 4 are on the same horizontal plane. At this time, the scale indicated by the sliding ring 3 is zeroed (or the zero scale is read directly), thus achieving the zeroing effect.

[0029] See also Figure 6 The unlocking drive assembly 8 includes: a scissor holder 81 and a first force-applying spring 82; wherein, the first end of the scissor holder 81 (such as...) Figure 6 The bottom end shown is connected to the slip ring locking element 5, and the second end (as shown) Figure 6 The top of the scissor frame 81 is connected to an unlocking control 83, which is used to pull the scissor frame 81 to fold, thereby causing the slip ring locking member 5 to retract, so that the two resistance buckles slide inward into the main support rod 1, thereby unlocking the slip ring 3 and the main support rod 1. The first force spring 82 is set at the second end of the scissor frame 81, which is used to apply a reset force to the scissor frame 81 to reset the scissor frame 81 to the open state. Specifically, the retraction of the resistance buckles can be controlled manually. An unlocking control 83 can be provided at the grip part 11 of the main support rod 1. Its power output end can be connected to the top of the scissor frame 81, and the bottom end of the scissor frame 81 can be connected to two resistance buckles. The unlocking control 83 can be referenced to the movement of a bicycle brake. The scissor frame 81 can be unlocked by controlling the unlocking control 83, and the scissor frame 81 can be reset by the first force spring 82 set on the scissor frame 81. At the same time, the second force spring 31 is used to ensure the stability of the resistance buckle reset.

[0030] Referring again to Figures 6 and 7, the unlocking control 83 may include a force handle 831 and a brake connecting rope 832. The force handle 831 is located at the top of the main support rod 1. The two ends of the brake connecting rope 832 are connected to the force handle 831 and the first end of the scissor frame 81, respectively, for pulling the scissor frame 81 to fold under the action of the force handle 831. Specifically, the force handle 831 is located at the grip portion 11, enabling control of the bottom scissor frame 81 and the resistance buckle.

[0031] In summary, the insertion-type thickness gauge provided in this embodiment can lock the sliding ring 3 onto the main support rod 1 via the slip ring locking member 5. By pressing down the main support rod 1, the sliding ring 3 and the pin 4 are driven down until the insertion end of the pin 4 is inserted into the lower surface of the layer to be tested 9. After the insertion end of the pin 4 is inserted into the lower surface of the layer to be tested 9, the lock between the sliding ring 3 and the main support rod 1 is released. The main support rod 1 moves relative to the pin 4 and the sliding ring 3 toward the layer to be tested 9 until the support base plate 2 abuts against the upper surface of the layer to be tested 9. The thickness of the layer to be tested 9 is determined based on the relative movement between the main support rod 1 and the sliding ring 3. The insertion-type detection method will not cause damage to the asphalt paving layer, avoids the detection method of "one person testing and a team of people cooperating", and saves a lot of labor costs. Moreover, it simplifies the tedious and laborious measurement process into a simple insertion action, which significantly reduces the labor intensity of the testing personnel. Furthermore, the instrument only needs to be vertically inserted into the asphalt layer (the object being measured), and the paving thickness can be directly read through the scale on the main support rod 1. Operation is simple, requiring no complex procedures or additional measuring tools (such as a measuring tape), thus lowering the operational threshold. The design, where the nail 4 first contacts the base layer and then the main support rod 1 contacts the asphalt surface, avoids the error of manually judging the insertion depth in the "iron nail insertion method," ensuring accurate measurement. The testing process is rapid, allowing for spot checks of multiple points in a short time, meeting the testing frequency requirements of large-area paving construction and improving measurement efficiency. Moreover, the scale directly displays the thickness value, significantly improving accuracy.

[0032] Method Implementation Examples: See Figure 11 This is a flowchart of the asphalt layer thickness detection method provided in an embodiment of the present invention. As shown in the figure, the method includes the following steps: Step S1: The sliding ring 3 is locked to the main support rod 1 by the slip ring locking part 5 of the insertion thickness gauge to form a fixed structure.

[0033] Specifically, the first step is to perform a preparatory zeroing operation, which involves setting the instrument pointer to zero to ensure that the pin 4 can slide smoothly on the main support rod 1. The zeroing operation is as follows: Figure 7 As shown, the bottom wall of the supporting base plate 2 and the tip of the pin 4 are on the same horizontal plane. At this time, adjust the height of the scale 6 so that the scale indicated by the sliding ring 3 is zero. Then, fix it as follows. Figure 8As shown, the sliding ring locking piece 5 can be used to lock the sliding ring 3 onto the main support rod 1 to form a fixed structure. At this time, the distance between the tip of the pin and the bottom wall of the support base plate 2 is greater than the thickness of the layer 9 to be tested.

[0034] Step S2: Position the fixed structure perpendicular to the surface of the layer 9 to be tested, and insert the fixed structure vertically downward into the layer 9 to be tested until the insertion end of the pin 4 reaches the lower surface of the layer 9 to be tested.

[0035] Specifically, such as Figure 8 As shown, the operator holds the hand end of the main support rod 1, holds the instrument perpendicular to the surface of the layer to be tested 9 (the paved layer), and inserts it vertically downwards. During insertion, because the tip of the insert 4 is lower than the end face of the main support rod 1, it first penetrates the asphalt mixture and continues downwards until its horizontal section firmly abuts against the hard underlying layer, as shown. Figure 9 As shown.

[0036] Step S3: Release the locking between the sliding ring 3 and the main support rod 1 by using the slip ring locking member 5 of the insertion thickness gauge, and press down the main support rod 1 so that the main support rod 1 slides down relative to the pin 4 until the support base plate 2 presses against the upper surface of the layer to be tested 9.

[0037] Specifically, after the insert 4 stops descending after touching the bottom, the operator squeezes the control lever 831 to retract the resistance buckle and continues to press down the main support rod 1. At this time, the insert 4 remains stationary, while the main support rod 1 slides downward relative to the insert 4 until the support base plate 2, i.e., the measuring reference end, contacts the surface of the layer to be tested 9, i.e., the upper surface of the asphalt paving layer. Figure 10 As shown.

[0038] Step S4: Determine the thickness of the layer 9 to be measured based on the distance the main support rod 1 slides relative to the pin.

[0039] Specifically, at this point, the distance that the main support rod 1 slides relative to the pin 4 is the thickness of the asphalt paving layer. That is, the value indicated by the upper surface of the sliding ring 3 is the measured value, which is the actual thickness, i.e., the thickness H of the layer 9 to be measured.

[0040] In summary, the asphalt layer thickness detection method provided in this embodiment can lock the sliding ring 3 onto the main support rod 1 using the sliding ring locking member 5. By pressing down the main support rod 1, the sliding ring 3 and the insert 4 are driven down until the insertion end of the insert 4 is inserted into the lower surface of the layer to be tested 9. After the insertion end of the insert 4 is inserted into the lower surface of the layer to be tested 9, the locking between the sliding ring 3 and the main support rod 1 is released. The main support rod 1 moves relative to the insert 4 and the sliding ring 3 toward the layer to be tested 9 until the support base plate 2 abuts against the upper surface of the layer to be tested 9. The thickness of the layer to be tested 9 is determined based on the relative movement between the main support rod 1 and the sliding ring 3. The insertion-type detection method will not cause damage to the asphalt paving layer, avoids the detection method of "one person testing and a team of people cooperating", and saves a lot of labor costs. Moreover, it simplifies the tedious and laborious measurement process into a simple insertion action, which significantly reduces the labor intensity of the testing personnel. Furthermore, the instrument needs to be inserted vertically into the asphalt layer (the object being measured), and the paving thickness can be directly read through the scale on the main support rod 1. Operation is simple, requiring no complex procedures or additional measuring tools (such as a measuring tape), thus lowering the operational threshold. The design of the nail 4 contacting the base layer first, followed by the main support rod 1 contacting the asphalt surface, avoids the error of manually judging the insertion depth in the "iron nail insertion method," ensuring accurate measurement. The testing process is rapid, allowing for spot checks of multiple points in a short time, meeting the testing frequency requirements of large-area paving construction and improving measurement efficiency. Moreover, the scale directly displays the thickness value, significantly improving accuracy.

[0041] It should be noted that in the description of this invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc., which indicate directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of description and is not intended to indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0042] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0043] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. An insertable thickness gauge, characterized by The insertable thickness detector comprises: a main support rod, a bottom of which is provided with a support bottom plate for supporting on an upper surface of a layer to be measured; a sliding ring which is sleeved on the main support rod in a slidable manner; a plug which is connected to the sliding ring at one end and has the other end as an insertion end for insertion into the layer to be measured until the insertion end is inserted into a lower surface of the layer to be measured; a sliding ring locking member which is arranged on the main support rod for locking the sliding ring on the main support rod, so that the sliding ring and the plug are pressed down by pressing down the main support rod until the insertion end of the plug is inserted into the lower surface of the layer to be measured, and after the insertion end of the plug is inserted into the lower surface of the layer to be measured, the locking between the sliding ring and the main support rod is released, so that the main support rod moves towards the layer to be measured relative to the plug until the support bottom plate abuts against the upper surface of the layer to be measured, thereby determining the thickness of the layer to be measured based on the relative movement between the main support rod and the sliding ring.

2. The insertable thickness detector according to claim 1, wherein the sliding ring locking member is connected with an unlocking driving assembly, and an operation input end of the unlocking driving member is arranged at a top end of the main support member for manual operation to release the locking between the sliding ring and the main support rod.

3. The insertable thickness gauge of claim 2, wherein, the unlocking driving assembly comprises: a scissor frame which is connected to the sliding ring locking member at a first end and is connected with an unlocking control member at a second end for pulling the scissor frame to fold to drive the sliding ring locking member to retract, thereby releasing the locking between the sliding ring and the main support rod; a first force applying spring which is arranged at the second end of the scissor frame for applying a restoring force to the scissor frame to reset the scissor frame to an open state.

4. The insertable thickness gauge of claim 3, wherein, the unlocking control member comprises: a control handle which is arranged at the top end of the main support rod; a brake connecting rope which is connected with the control handle and the first end of the scissor frame at two ends, respectively, for pulling the scissor frame to fold under the action of the control handle.

5. The insertable thickness detector according to any one of claims 1 to 4, wherein the sliding ring locking member is two resistance buckles which are arranged on the main support rod in opposite radial directions of the main support rod, and each resistance buckle is slidably arranged in a side wall of the main support rod in the radial direction of the main support rod for protruding outside the main support rod to limit the top of the sliding ring, so that the sliding ring is locked between the resistance buckle and the support bottom plate.

6. The insertable thickness detector according to claim 5, wherein a downward sliding through guide groove is arranged on the sliding ring for guiding the sliding of the sliding ring when the sliding ring slides downward relative to the resistance buckle, so that the sliding ring can move downward under the action of gravity and pass through the resistance buckle to slide between the resistance buckle and the support bottom plate; the distance between the resistance buckle and the support bottom plate is matched with the height of the sliding ring.

7. The insertable thickness detector according to any one of claims 1 to 4, wherein The main support rod is provided with a scale for identifying the height position of the sliding ring relative to the main support rod.

8. The plug-in thickness detector according to claim 7, characterized in that, The scale is slidably arranged on the main support rod along the length direction of the main support rod, and is used to adjust the zero position of the scale to the height position of the sliding ring when the insertion end of the plug is flush with the bottom wall of the support bottom plate, so as to realize zero setting.

9. The plug-in thickness detector according to claim 8, characterized in that, The scale is provided with a scale locking member for locking the scale to the main support rod after zero setting adjustment.

10. A method of detecting the thickness of an asphalt layer, characterized by The plug-in thickness detector according to any one of claims 1 to 9 comprises the following steps: The sliding ring is locked to the main support rod by the sliding ring locking member of the plug-in thickness detector, forming a fixed structure; The fixed structure is perpendicular to the surface of the layer to be measured, and the fixed structure is vertically inserted into the layer to be measured until the insertion end of the plug is inserted into the lower surface of the layer to be measured; The sliding ring and the main support rod are unlocked by the sliding ring locking member of the plug-in thickness detector, and the main support rod is pressed downward so that the main support rod slides downward relative to the plug until the support bottom plate is in contact with the upper surface of the layer to be measured; The thickness of the layer to be measured is determined based on the sliding distance of the main support rod relative to the plug.

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