Roadbed compactness detection device for road detection

Abstract

The invention provides a roadbed compactness detection device for road detection, and relates to the technical field of detection devices.The roadbed compactness detection device comprises a sand filling barrel, a measuring mark is arranged in the sand filling barrel, a sand outlet funnel is arranged in the sand filling barrel, a sand outlet is formed in the lower end of the sand outlet funnel, and a switch plug is slidably mounted in the sand outlet in the sand outlet funnel; a plurality of sections of spring sleeves are arranged in the sand filling cylinder, a sand outlet funnel is arranged on the sand filling cylinder, a perforated sweeping block is arranged above the sand outlet funnel, a group of sand passing holes are formed in the perforated sweeping block, a scraping plate is arranged in the sand filling cylinder, and a self-adaptive scraping mechanism is arranged in the sand filling cylinder. The lower end of the measuring mark is a light plate and can be naturally attached to the sand surface, sand is not compacted, the sand accumulation state is not changed, and the multi-section spring sleeve can guarantee that the measuring mark smoothly moves up and down and is matched with a measuring ruler with volume scales on the outer wall of the sand filling cylinder.

Description

Technical Field

[0001] This invention belongs to the field of testing device technology, and more specifically, relates to a roadbed compaction testing device for road testing. Background Technology

[0002] Subgrade compaction testing is an engineering quality control method that measures the actual compaction degree of subgrade soil through testing. The core of the test is to compare the actual dry density of the subgrade soil with the maximum dry density obtained from indoor standard tests, and to express the compaction as a percentage. Its main purpose is to ensure that the subgrade has sufficient strength and stability, and to avoid road surface cracking and deformation due to settlement in the later stage. Commonly used methods on site include the ring cutter method, sand cone method, and nuclear density meter method. The operation must be strictly followed to ensure data accuracy, and ultimately provide key guarantees for the bearing capacity of the subgrade and the overall service life of the road.

[0003] Current compaction testing devices have been found to have at least the following problems: First, in the field testing of roadbed compaction, the sand-filling method has become the mainstream due to its convenience and applicability. The core of compaction calculation is to accurately obtain the true volume of sand in the measuring pit. Its accuracy directly determines the reliability of the test. The existing sand-filling method relies on the indirect conversion of weight and density to calculate the volume: first, the loose density of sand is calibrated indoors, then the initial and remaining weight of sand in the sand-filling cylinder are weighed, the weight of sand entering the pit is calculated, and then the volume is deduced. The accuracy is completely tied to the density calibration. Fluctuations in temperature and humidity on site, mismatch between the depth of the test pit and the calibration tank, and changes in particle size distribution due to repeated use of sand can all cause the sand density to deviate from the calibration value, resulting in systematic errors in volume and affecting the compaction determination. This can easily lead to misjudgment and rework of qualified road sections or omission of unqualified road sections, causing roadbed diseases. Therefore, it is urgent to supplement the method with direct volume measurement to meet the needs of accurate control of construction quality.

[0004] Secondly, in the field operation environment of using the sand-filling method for roadbed compaction testing, workers need to fill sand into the roadbed measurement pit through a sand-filling cylinder to calculate the compaction degree by the sand volume. During this process, when the sand falls from the outlet of the sand-filling cylinder in a concentrated manner, it is easy to form a shape with a concave center and convex edges due to the concentrated sand discharge trajectory. At the same time, the inner wall of the sand-filling cylinder is prone to adsorbing some residual sand due to sand particles. Moreover, as the sand discharge process progresses, the height of the sand surface inside the sand-filling cylinder will continue to decrease. The leveling structure needs to be adapted to the change in sand surface height. The existing leveling method is difficult to dynamically match the real-time changes in sand surface height, and it is also impossible to adaptively adjust the leveling angle for the concave center. The leveling effect on the convex edges is limited, and it is difficult to completely remove the residual sand from the inner wall of the sand-filling cylinder. This situation will lead to insufficient flatness of the sand surface inside the sand-filling cylinder and the residual sand on the cylinder wall will not be included in the volume measurement, thus causing a deviation between the initial sand volume and the remaining sand volume measurement results. This will affect the accuracy of the calculation of the actual volume of sand flowing into the measurement pit, and ultimately affect the accuracy of the roadbed compaction degree calculation. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a roadbed compaction testing device for road inspection, thereby resolving the problems described above.

[0006] A roadbed compaction testing device includes a sand-filling cylinder, a measuring mark inside the sand-filling cylinder, a sand-discharging funnel inside the sand-filling cylinder, a sand-discharging port at the lower end of the sand-discharging funnel, a switch plug slidably installed inside the sand-discharging port on the sand-discharging funnel, a perforated leveling block above the sand-discharging funnel with a set of sand-passing holes, a scraper inside the sand-filling cylinder, and an adaptive leveling mechanism inside the sand-filling cylinder. The adaptive leveling mechanism can adjust the leveling height according to the sand surface height, and can adjust the angle when a pit appears in the middle of the sand surface. A blocking observation mechanism is provided above the sand-discharging funnel. When the sand surface height in the measuring pit below the blocking observation mechanism reaches the upper end of the measuring pit, the blocking mechanism can block the sand-discharging funnel by raising the switch plug. It can also add a measurement method of observing the sand volume in the measuring pit based on the sand-filling method.

[0007] Preferably, the adaptive leveling mechanism includes a fixed frame, which is fixedly installed above the sand-filling cylinder. A support column is fixedly installed on the fixed frame, and a spiral slide is fixedly installed on the surface of the support column. A sliding groove is formed in the spiral slide, and the sliding groove on the spiral slide follows the spiral trajectory of the spiral slide. The support column is located above the switch plug, and a magnetic sleeve is provided above the switch plug. The magnetic sleeve is slidably installed on the support column. An annular floating plate is fixedly installed above the magnetic sleeve, and an annular groove is formed at the center of the annular floating plate. A fixed column is fixedly installed on the annular floating plate, and a gravity block is slidably installed on the fixed column. A sliding pressure plate is fixedly installed on the gravity block. At least four deformable sand-leveling rods are rotatably installed on the annular floating plate. The plates are arranged in a circular pattern. Each of the deformable sand-leveling rods has an unfolding limiting groove. A sand-scraping linkage rod is slidably installed on the circular floating plate. The sand-scraping linkage rod is connected to the circular floating plate by a torsion spring. A sliding block is rotatably installed at one end of the sand-scraping linkage rod. The sliding block on the sand-scraping linkage rod is slidably installed in the unfolding limiting groove. The sliding pressure plate is located above the sand-scraping linkage rod. A scraper is provided on the deformable sand-leveling rod. The scraper is connected to the deformable sand-leveling rod by a spring. A perforated leveling block is rotatably installed below the deformable sand-leveling rod. A fixing ring is fixedly installed on the fixing column. A locking ring is fixedly installed on the fixing ring. A lifting rod is fixedly installed on the locking ring. A one-way pawl is rotatably installed inside the locking ring. The one-way pawl is connected to the locking ring by a torsion spring.

[0008] Preferably, the sealing and observation mechanism includes a switch floating plate with an inclined lower end. The switch floating plate is fixedly installed at the lower end of the switch plug. A switch connecting column is slidably installed inside the support column. The switch connecting column is connected to the support column by a spring. A magnet is provided below the magnetic sleeve. A measuring ruler is fixedly installed on the sand filling cylinder with volume graduations. Multiple spring sleeves are fixedly installed on the sand filling cylinder, and the measuring mark is fixedly installed below the multiple spring sleeves.

[0009] Compared with the prior art, the present invention has the following beneficial effects: In this invention, a direct volume measurement angle is constructed by using a measuring mark, a multi-segment spring sleeve, and a measuring ruler with volume graduations. The lower end of the measuring mark is made of lightweight board material, which can naturally conform to the sand surface without compacting the sand or changing the sand's accumulation state. The multi-segment spring sleeve ensures that the measuring mark can move smoothly up and down. Combined with the measuring ruler with volume graduations on the outer wall of the sand filling cylinder, the initial total volume of sand in the sand filling cylinder and the remaining volume after sand discharge can be accurately read. This design supplements the traditional sand filling method, which relies solely on the single measurement dimension of weight-density conversion, forming a two-dimensional data verification of weight and volume. This effectively reduces the impact of density deviations caused by fluctuations in on-site temperature and humidity, changes in standard sand particle size distribution, etc., on compaction calculation, and significantly improves the accuracy of roadbed compaction measurement.

[0010] In this invention, an adaptive leveling mechanism is provided, with its fixing frame installed above the sand filling cylinder. The support column is fixed on the fixing frame and has a spiral slide on its surface. The annular floating plate is connected to the magnetic sleeve and can move synchronously with the sand surface. The leveling height can be dynamically adjusted according to the height of the sand surface in the sand filling cylinder. When a pit appears in the middle of the sand surface, the angle can be adjusted adaptively. At the same time, the perforated leveling block below the deformation leveling rod can smooth the protrusions around the sand surface. The scraper on the deformation leveling rod can scrape off the residual sand on the inner wall of the sand filling cylinder, effectively ensuring the flatness of the sand surface and avoiding volume measurement errors caused by irregular sand surface or sand accumulation on the inner wall, significantly improving the accuracy of the initial and remaining sand volume measurement.

[0011] In this invention, a linkage structure consisting of a deformation leveling rod, a scraping linkage rod, and a gravity block is used. The gravity block can slide along a fixed column and drive a sliding pressure plate to press down on the scraping linkage rod. The scraping linkage rod then drives the deformation leveling rod to automatically unfold along the unfolding limiting groove. When the adaptive scraping mechanism falls, the one-way pawl in the locking ring engages with the spiral slide on the support column, which drives the deformation leveling rod to rotate and scrape the sand surface. There is no need to manually adjust the scraping angle and range, thus achieving automated sand surface scraping, reducing the problem of uneven scraping caused by manual intervention, and further improving detection efficiency and data stability.

[0012] In this invention, a magnetic attraction structure consisting of a magnetic sleeve and a switch plug is used. When the operator lifts the adaptive scraping mechanism, the magnetic sleeve moves upward, breaking the magnetic attraction between it and the switch plug, causing the switch plug to automatically fall and open the sand outlet. When the sand level in the sand filling cylinder drops, the magnetic sleeve moves downward synchronously, restoring the magnetic attraction with the switch plug. This assists the switch plug in moving upward to seal the sand outlet. The entire process eliminates the need for manual insertion and removal of the switch plug, simplifying the sand discharge control operation, reducing manual labor intensity, and improving the response speed of opening and sealing the sand outlet, ensuring the continuity of the detection process. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the sand-discharging funnel structure of the present invention; Figure 3 This is a schematic diagram of the support column structure of the present invention; Figure 4 This is a schematic diagram of the magnetic sleeve structure of the present invention; Figure 5 This is a schematic diagram of the sand-filling cylinder structure of the present invention; Figure 6 This is a schematic diagram of the annular floating plate structure of the present invention; Figure 7 This is a schematic diagram of the deformable flat sand bar structure of the present invention; Figure 8 This is a schematic diagram of the unidirectional ratchet structure of the present invention; Figure 9 This is a schematic diagram of the switch plug structure of the present invention; Figure 10 This is the present invention. Figure 2 Enlarged view of the structure at point A in the middle.

[0014] In the diagram, the correspondence between the component names and the attached drawing numbers is as follows: 1. Sand filling cylinder; 2. Fixing frame; 3. Support column; 4. Spiral slide; 5. Switch connecting column; 6. Switch plug; 7. Switch floating plate; 8. Sand discharge funnel; 9. Magnetic sleeve; 10. Annular floating plate; 11. Deformation sand leveling rod; 12. Unfolding limiting groove; 13. Perforated leveling block; 14. Scraper; 15. Sand scraping linkage rod; 16. Gravity block; 17. Sliding pressure plate; 18. Fixing column; 19. Fixing ring; 20. Snap-fit ​​ring; 21. One-way pawl; 22. Lifting rod; 23. Multi-segment spring sleeve; 24. Measuring mark; 25. Measuring ruler. Detailed Implementation

[0015] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0016] Please see Figures 1-10This invention provides a roadbed compaction testing device for road inspection, including a sand-filling cylinder 1. A measuring mark 24 is provided inside the sand-filling cylinder 1 to observe the volume of sand inside. A sand-discharging funnel 8 is provided inside the sand-filling cylinder 1, with a sand outlet at the lower end of the funnel. A switch plug 6 is slidably installed inside the sand outlet of the funnel, controlling whether sand falls. A perforated leveling block 13 is provided above the funnel, with a set of sand-passing holes. Because the sand in the sand-filling cylinder 1 falls from the sand outlet in the middle of the funnel 8, a pit will appear in the middle of the sand inside the sand-filling cylinder 1, and protrusions will appear around the edges. The perforated leveling block 13 can level the protrusions around the sand inside the sand-filling cylinder 1. A scraper 14 is provided inside the sand-filling cylinder 1, which can scrape off the sand remaining on the inner wall of the sand-filling cylinder 1 during the sand discharge process, making the measurement results more accurate.

[0017] The sand filling cylinder 1 is equipped with an adaptive leveling mechanism. The adaptive leveling mechanism can adjust the leveling height according to the sand surface height, and can also adjust the angle when a pit appears in the middle of the sand surface. A sealing observation mechanism is provided above the sand outlet funnel 8. When the sand surface height in the measuring pit below the sealing observation mechanism reaches the upper end of the measuring pit, the sealing mechanism can block the sand outlet funnel 8 by raising the switch plug 6. It can also add the measurement method of observing the sand volume in the measuring pit on the basis of the sand filling method.

[0018] like Figure 1 , Figure 6 , Figure 7 , Figure 8 and Figure 9As shown, the adaptive leveling mechanism includes a fixed frame 2, which is fixedly installed above the sand-filling cylinder 1. A support column 3 is fixedly installed on the fixed frame 2, and a spiral slide 4 is fixedly installed on the surface of the support column 3. A sliding groove is opened in the spiral slide 4, and the sliding groove on the spiral slide 4 is opened along the spiral trajectory of the spiral slide 4. The support column 3 is located above the switch plug 6, and a magnetic sleeve 9 is provided above the switch plug 6. The magnetic sleeve 9 is slidably installed on the support column 3. Because the opening inside the magnetic sleeve 9 is large, the magnetic sleeve 9 can slide on the support column 3 without being affected by the spiral slide 4. An annular floating plate 10 is fixedly installed above the magnetic sleeve 9. An annular groove is opened at the center of the annular floating plate 10. The annular floating plate 10 is used to fix the position of the adaptive leveling mechanism. Above the sand surface, a fixed column 18 is fixedly installed on the annular floating plate 10. A gravity block 16 is slidably installed on the fixed column 18. A sliding pressure plate 17 is fixedly installed on the gravity block 16. At least four deformable sand-flattening rods 11 are rotatably installed on the annular floating plate 10. The deformable sand-flattening rods 11 are arranged in a ring around the annular floating plate 10. Each deformable sand-flattening rod 11 has an expansion limiting groove 12. A sand-scraping linkage rod 15 is slidably installed on the annular floating plate 10. The sand-scraping linkage rod 15 is connected to the annular floating plate 10 by a torsion spring. A sliding block is rotatably installed at one end of the sand-scraping linkage rod 15. The sliding block on the sand-scraping linkage rod 15 is slidably installed in the expansion limiting groove 12. The sliding pressure plate 17 is located above the sand-scraping linkage rod 15. When sand is poured into the sand filling cylinder 1... Afterwards, the staff lifts the adaptive leveling mechanism upwards. The annular floating plate 10 keeps the entire mechanism on the sand surface. When the sand falls, the annular floating plate 10 falls synchronously. The gravity block 16 drives the sliding pressure plate 17 to press downwards. The pressure of the gravity block 16 is greater than the force of the torsion spring between the annular floating plate 10 and the sand-scraping linkage rod 15. The sand-scraping linkage rod 15 unfolds, causing the sliding block inside to slide within the unfolding limiting groove 12, causing the deformable sand-leveling rod 11 to flip downwards. The deformable sand-leveling rod 11 is equipped with a scraper 14, which is connected to the deformable sand-leveling rod 11 by a spring. The scraper 14 can scrape the sand off the inner wall of the sand-filling cylinder 1 when the sand falls inside the sand-filling cylinder 1. The perforated leveling block 13 is rotatably installed below the deformable sand-leveling rod 11. The fixed column 18 A fixed ring 19 is fixedly installed on the upper part of the mechanism, and a locking ring 20 is fixedly installed on the fixed ring 19. A lifting rod 22 is fixedly installed on the locking ring 20. The operator can lift the adaptive leveling mechanism by lifting the one-way pawl 21. The one-way pawl 21 is rotatably installed inside the locking ring 20. The one-way pawl 21 is limited above by the locking ring 20. The one-way pawl 21 and the locking ring 20 are connected by a torsion spring. The one-way pawl 21 can rotate downward when the locking ring 20 moves upward. The spiral slide 4 engages with the one-way pawl 21. When the fixed ring 19 falls, the one-way pawl 21 is opened by the torsion spring and limited by the locking ring 20. During the fall, the one-way pawl 21 can engage with the sliding groove in the spiral slide 4, so that the spiral slide 4 can drive the fixed ring 19 to rotate during the fall.The fixed ring 19 is fixedly connected to the annular floating plate 10 via the fixed column 18. When the adaptive leveling mechanism is deployed, it can fall synchronously with the sand surface. During the fall, the one-way pawl 21, which is engaged, can drive the adaptive leveling mechanism to rotate via the spiral slide 4. When the sand surface protrudes at the edge of the sand filling cylinder 1, the deformation leveling rod 11 contacts it and can lift it up without affecting the leveling effect. Under the action of the perforated leveling block 13, the protrusions at the edge of the sand filling cylinder 1 can be quickly smoothed out. The rotation of the deformation leveling rod 11 drives the scraper 14 to rotate, scraping the sand off the inner wall of the sand filling cylinder 1. The perforated leveling block 13 can smooth out the protruding parts around the inside of the sand filling cylinder 1, making the volume observation more accurate.

[0019] like Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 10 As shown, the sealing and observation mechanism includes a switch floating plate 7 with a sloping lower end. The switch floating plate 7 is fixedly installed at the lower end of the switch plug 6. When sand falls, the switch floating plate 7 allows the sand to fall from the outside of the switch floating plate 7, ensuring that the sand in the measuring pit falls evenly. A switch connecting column 5 is slidably installed inside the support column 3. The switch connecting column 5 is connected to the support column 3 by a spring. When the sand falls and accumulates, it can exert a lifting force on the switch floating plate 7. This force, in conjunction with the spring on the support column 3, drives the switch connecting column 5 and the switch plug 6 to move upward, blocking the sand outlet on the sand outlet funnel 8. A magnet is located below the magnetic sleeve 9. The magnet can assist the switch plug 6 in blocking the sand outlet funnel 8 through magnetic force. After the operator lifts the adaptive scraping mechanism, the magnetic attraction between the magnetic sleeve 9 and the switch plug 6 is broken, and the switch plug 6 falls, causing the sand outlet on the sand outlet funnel 8 to open. When the sand surface... After falling, the magnetic sleeve 9 falls, and the magnet below the magnetic sleeve 9 and the switch plug 6 above regain their magnetic attraction, pulling the switch plug 6 up and closing the sand outlet of the sand funnel 8. A measuring ruler 25 is fixedly installed on the sand filling cylinder 1, and the measuring ruler 25 has a volume scale. A multi-segment spring sleeve 23 is fixedly installed on the sand filling cylinder 1, and a measuring mark 24 is fixedly installed below the multi-segment spring sleeve 23. The measuring mark 24 is divided into upper and lower parts. The lower end of the measuring mark 24 is a lightweight plate, which can move the measuring mark 24 to the sand surface. At this time, the upper part of the measuring mark 24 measures the actual sand volume. The multi-segment spring sleeve 23 has a spring inside. After the worker puts sand into the sand filling cylinder 1, the measuring mark 24 is lowered to measure the sand volume in the sand filling cylinder 1. Then, the adaptive scraping mechanism is lifted to fill the measuring pit, and the measuring mark 24 is lowered again to measure the subsequent sand volume. This adds the dimension of volume measurement to the sand filling method.

[0020] Working principle: The first step is to conduct an overall inspection of the device, confirming that core components such as the sand filling cylinder 1, sand outlet funnel 8, and switch plug 6 are undamaged and that connections are secure. Special attention is paid to checking the flexibility of the multi-segment spring sleeve 23, the magnetic force between the magnetic sleeve 9 and the switch plug 6, and the smooth rotation and sliding of the deformation leveling rod 11 and the scraping linkage rod 15 in the adaptive leveling mechanism. Next, the sand for testing is processed, using standard sand with uniform particle size and stable density. Impurities and lumps are removed to ensure consistent sand density. The processed sand is then slowly poured into the sand filling cylinder 1. Gently tap the outer wall of the sand filling cylinder 1 to expel air from the gaps in the sand until the sand surface is initially flat and reaches the preset initial scale line on the inner wall of the sand filling cylinder 1. Finally, perform the initial volume measurement: slowly lower the measuring mark 24 through the multi-segment spring sleeve 23. Since the lower end of the measuring mark 24 is a lightweight plate, it will naturally adhere to the sand surface without compacting the sand. After the measuring mark 24 is stable, observe the alignment position of the upper end of the measuring mark 24 with the measuring ruler 25 on the outer wall of the sand filling cylinder 1. Combined with the volume scale on the measuring ruler 25, record the initial total volume V1 of the sand in the sand filling cylinder 1, and record the ambient temperature at the same time.

[0021] In the second step, the staff member holds the lifting rod 22 and lifts the adaptive leveling mechanism upward. At this time, the magnetic sleeve 9 fixed on the mechanism moves upward with the lifting action, and the magnetic force between it and the switch plug 6 is broken. Under its own gravity, the switch plug 6 slides down along the sand outlet of the sand outlet funnel 8, fully opening the sand outlet. The sand in the sand filling cylinder 1 begins to flow through the sand outlet funnel 8 into the preset roadbed measurement pit below. At the same time, the annular floating plate 10 moves down synchronously with the sand surface height in the sand filling cylinder 1, always maintaining a state of contact with the sand surface. The gravity block 16 on the annular floating plate 10 slides down along the fixed column 18 under the action of gravity, driving the sliding pressure plate 17 below to press down the sand scraping linkage rod 15. The sand scraping linkage rod 15 overcomes the torsion spring force connected to the annular floating plate 10 and unfolds. The sliding block at its end slides along the unfolding limit groove 12 of the deformable sand leveling rod 11, causing at least four annularly arranged deformable sand leveling rods 11 to unfold towards the inner wall of the sand filling cylinder 1, preparing for the subsequent leveling operation.

[0022] In the third step, as the sand continues to flow into the measuring pit, the adaptive leveling mechanism descends with the sand surface. Under the action of the falling force, the one-way pawl 21 in the locking ring 20 is engaged in the sliding groove of the spiral slide 4 on the surface of the support column 3. The spiral slide 4 drives the fixing ring 19, the fixing column 18 and the annular floating plate 10 to rotate slowly as a whole through the one-way pawl 21, which in turn drives the deformation leveling rod 11 to rotate synchronously. During the rotation, the perforated leveling block 13 below the deformation leveling rod 11 scrapes the surface of the sand in the sand filling cylinder 1. Since the sand falling from the middle sand outlet of the sand outlet funnel 8 is prone to causing the sand surface to be concave in the middle and protruding around the edges, the perforated leveling block 13 allows a small amount of sand to pass through through its own sand passage hole, while pushing the sand protruding around the edges to the middle concave pit, ensuring that the sand surface is always in a horizontal state. The scraper 14 on the deformation leveling rod 11 is in close contact with the inner wall of the sand filling cylinder 1 under the action of the spring force, and scrapes off the sand remaining on the inner wall as the deformation leveling rod 11 rotates.

[0023] Fourth, when the sand level in the measuring pit rises to the top of the measuring pit, the sand exerts an upward pushing force on the switch floating plate 7. This pushing force overcomes the tension of the spring in the support column 3, causing the switch connecting column 5 to move upward, which in turn pushes the switch plug 6 towards the sand outlet of the sand funnel 8. At this time, the sand level in the sand filling cylinder 1 continues to drop, and the magnetic sleeve 9 moves down synchronously with the annular floating plate 10. The magnet below it and the switch plug 6 regain their magnetic attraction. The two work together to completely seal the sand outlet of the sand funnel 8, stopping the sand discharge. Finally, the remaining sand volume is measured: the measuring mark 24 is lowered again through the multi-segment spring sleeve 23. After it stabilizes, the corresponding remaining sand volume V2 on the measuring ruler 25 is read. The actual sand volume filling the measuring pit is calculated using the formula V = V1 - V2. Combined with the preset volume of the measuring pit, core volume data is provided for the accurate calculation of the subsequent roadbed compaction. This adds a volume dimension to the traditional sand filling method and improves the detection accuracy.

[0024] The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the invention to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical application of the invention, and to enable those skilled in the art to understand the invention and to design various embodiments with various modifications suitable for a particular purpose.

Claims

1. A roadbed compaction testing device for road inspection, comprising a sand-filling cylinder (1), characterized in that: The sand filling cylinder (1) is equipped with a measuring mark (24), and the sand filling cylinder (1) is equipped with a sand outlet funnel (8). A sand outlet is opened at the lower end of the sand outlet funnel (8). A switch plug (6) is slidably installed in the sand outlet funnel (8). A perforated leveling block (13) is provided above the sand outlet funnel (8). A set of sand passage holes is opened on the perforated leveling block (13). A scraper (14) is provided inside the sand filling cylinder (1). The sand filling cylinder (1) is equipped with an adaptive scraping mechanism. The adaptive scraping mechanism can adjust the scraping height according to the sand surface height, and can adjust the angle when a pit appears in the middle of the sand surface. The sand outlet funnel (8) is equipped with a sealing observation mechanism above it. When the sand surface height in the measuring pit below the sealing observation mechanism reaches the upper end of the measuring pit, the sealing mechanism can block the sand outlet funnel (8) by raising the switch plug (6). It can also add a measurement method for the sand volume in the measuring pit based on the sand filling method.

2. The roadbed compaction testing device for road testing as described in claim 1, characterized in that, The adaptive leveling mechanism includes a fixed frame (2), which is fixedly installed above the sand filling cylinder (1). A support column (3) is fixedly installed on the fixed frame (2), and a spiral slide (4) is fixedly installed on the surface of the support column (3). A sliding groove is provided in the spiral slide (4).

3. The roadbed compaction testing device for road testing as described in claim 2, characterized in that, The sliding groove on the spiral slide (4) is opened along the spiral trajectory of the spiral slide (4). The support column (3) is located above the switch plug (6). A magnetic sleeve (9) is provided above the switch plug (6). The magnetic sleeve (9) is slidably installed on the support column (3). An annular floating plate (10) is fixedly installed above the magnetic sleeve (9).

4. The roadbed compaction testing device for road testing as described in claim 3, characterized in that, The annular floating plate (10) has an annular groove at its center. A fixed column (18) is fixedly installed on the annular floating plate (10). A gravity block (16) is slidably installed on the fixed column (18). A sliding pressure plate (17) is fixedly installed on the gravity block (16). At least four deformable flat sand rods (11) are rotatably installed on the annular floating plate (10).

5. The roadbed compaction testing device for road testing as described in claim 4, characterized in that, The deformable flat sand rods (11) are arranged in a ring around the annular floating plate (10). Each deformable flat sand rod (11) is provided with an expansion limiting groove (12). A sand scraping linkage rod (15) is slidably installed on the annular floating plate (10). The sand scraping linkage rod (15) is connected to the annular floating plate (10) by a torsion spring. A sliding block is rotatably installed at one end of the sand scraping linkage rod (15).

6. The roadbed compaction testing device for road testing as described in claim 5, characterized in that, The sliding block on the sand scraping linkage rod (15) is slidably installed in the unfolding limiting groove (12). The sliding pressure plate (17) is located above the sand scraping linkage rod (15). The deformation leveling rod (11) is provided with a scraper (14). The scraper (14) and the deformation leveling rod (11) are connected by a spring. The perforated leveling block (13) is rotatably installed below the deformation leveling rod (11).

7. The roadbed compaction testing device for road testing as described in claim 6, characterized in that, A fixing ring (19) is fixedly installed on the fixing column (18), a snap ring (20) is fixedly installed on the fixing ring (19), a lifting rod (22) is fixedly installed on the snap ring (20), a one-way pawl (21) is rotatably installed inside the snap ring (20), and the one-way pawl (21) is connected to the snap ring (20) by a torsion spring.

8. The roadbed compaction testing device for road testing as described in claim 7, characterized in that, The blocking observation mechanism includes a switch floating plate (7), the lower end of which is an inclined surface. The switch floating plate (7) is fixedly installed at the lower end of the switch plug (6), and a switch connecting column (5) is slidably installed inside the support column (3).

9. The roadbed compaction testing device for road testing as described in claim 8, characterized in that, The switch connecting column (5) is connected to the support column (3) by a spring. A magnet is provided below the magnetic sleeve (9). A measuring ruler (25) is fixedly installed on the sand filling cylinder (1).

10. The roadbed compaction testing device for road testing as described in claim 9, characterized in that, The measuring ruler (25) is provided with volume scale, and a multi-segment spring sleeve (23) is fixedly installed on the sand filling cylinder (1). The measuring mark (24) is fixedly installed below the multi-segment spring sleeve (23).

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