Water-rich roadbed compactness detection device

Abstract

The application belongs to the technical field of roadbed detection, and discloses a water-rich roadbed compactness detection device, which comprises a ring-shaped top plate and a controller fixed on the top of the ring-shaped top plate, and further comprises: a plurality of blades, which are annularly and uniformly distributed below the ring-shaped top plate; a pressure detection unit is installed on the ring-shaped top plate, and the pressure detection unit is used for pushing the blades to insert into the soil layer and detecting the frictional resistance received by the blades during the insertion; a rotary driving unit is installed at the bottom of the ring-shaped top plate, and the rotary driving unit drives the blades to rotate about the axis of the ring-shaped top plate. The application can reduce the frequency of roadbed damage sampling, realize preliminary screening of roadbed continuous section compactness, improve the efficiency of roadbed detection and rectification operation, and can also regularize the annular cutting joint of cutting sampling, reduce the detection deviation caused by soil disturbance, slow down the fluctuation of soil sample moisture content, and assist in improving the accuracy of compactness calculation.

Description

Technical Field

[0001] This invention belongs to the field of roadbed testing technology, and in particular relates to a device for testing the compaction degree of water-rich roadbeds. Background Technology

[0002] The groundwater level along the Fushui section of the road is relatively high, and the natural moisture content of the roadbed soil is high. After filling, it is very easy to form springy soil. The compaction degree is the core indicator for controlling the settlement and frost heave of the roadbed. During construction, it is necessary to test the compaction quality and deal with the soft areas in time to ensure the overall stability of the roadbed. Therefore, the compaction degree test is indispensable.

[0003] Currently, the main methods for testing the compaction degree of roadbeds include the sand cone method, the ring cutter method, and the nuclear density and humidity meter method. Among them, the sand cone method is one of the most widely used methods. During the operation, after placing the substrate, a vertical cylindrical test pit is manually excavated. All the soil in the pit is collected, weighed, and the moisture content is measured. Then, standard sand is poured into the pit to calculate the pit volume, thereby calculating the dry density of the soil and finally obtaining the compaction degree result. This test result has high accuracy, but it is mainly used for compaction degree acceptance testing after roadbed construction. However, when using this method for testing during roadbed construction, the whole process is cumbersome, and single-point testing takes a long time, which cannot meet the needs of large-scale and rapid inspection of the entire road. In addition, because it requires multi-point sampling testing, the excavation area is large. At the same time, the random single-point sampling method makes it difficult to comprehensively identify weak sections with excessive moisture content along the road in advance. Hazards are often only discovered during formal acceptance, missing the opportunity for early drying, compaction, and rectification, which is not conducive to the pre-construction quality control of roadbed construction. Summary of the Invention

[0004] The purpose of this invention is to address the problems existing in the prior art by providing a compaction testing device for water-rich roadbeds that can adapt to the working conditions of water-rich roadbeds with high moisture content, can quickly screen weak areas of the roadbed in advance, predict the quality of compaction, and at the same time reduce the frequency of traditional damage sampling and improve the overall efficiency of roadbed testing.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is: a water-rich roadbed compaction degree testing device, comprising an annular top plate and a controller fixed to the top of the annular top plate, and further comprising: Multiple blades are evenly distributed in a ring below the annular top plate. The annular top plate is equipped with a pressure detection unit, which is used to push the blades into the soil layer and detect the frictional resistance encountered by the blades during the insertion process. A rotary drive unit is installed at the bottom of the annular top plate. The rotary drive unit drives the blade to rotate about the axis of the annular top plate. The blade is arc-shaped and coaxial with the annular top plate.

[0006] The aforementioned water-rich roadbed compaction testing device includes a pressure testing unit comprising multiple pressure-applying electric push rods that penetrate and are inserted into the surface of the annular top plate. The movable end of each pressure-applying electric push rod is fixed with a mounting plate. A pressure sensor and a suspension assembly are provided below the mounting plate. The pressure sensor is mounted on the top of the suspension assembly, and the detection end of the pressure sensor is fixedly connected to the mounting plate. The blade can rotate relative to the pressure sensor through the suspension assembly.

[0007] The aforementioned water-rich roadbed compaction testing device includes a suspension assembly comprising an arc-shaped guide rail fixed to the bottom of the pressure sensor, a suspension slider slidably connected in the guide rail groove of the arc-shaped guide rail, a mounting base fixed to the bottom of the suspension slider, and a blade fixed to the bottom of the mounting base.

[0008] In the aforementioned water-rich roadbed compaction testing device, multiple screws are fixed on the upper surface of the arc-shaped guide rail. The screws slide to the top of the mounting plate, and an adjusting nut is threadedly connected to the rod wall of the screw at the position above the mounting plate. Multiple support springs are fixed between the mounting plate and the upper surface of the arc-shaped guide rail.

[0009] In the aforementioned water-rich roadbed compaction testing device, multiple displacement probes are fixed at the bottom of the annular top plate, and the multiple displacement probes are evenly distributed in a ring about the axis of the annular top plate. A positioning column corresponding to the position of the displacement probe is fixed at the top of the arc-shaped guide rail, and the displacement probe is electrically connected to the controller.

[0010] The aforementioned water-rich roadbed compaction testing device includes a rotary drive unit comprising a support sleeve fixed to the bottom of an annular top plate. A drive ring is rotatably connected to the lower inner side of the support sleeve. A support plate is fixed to the outer side wall of the support sleeve. A drive motor is fixed to the surface of the support plate. The lower end of the output shaft of the drive motor rotatably extends to the lower part of the support sleeve and is fixedly connected to a gear. A plurality of evenly distributed annular transmission teeth are fixed to the outer ring surface of the drive ring, and the drive ring meshes with the gear through the transmission teeth. A sliding transmission assembly is installed on the drive ring. The blade rotates synchronously with the drive ring through the mounting base and the sliding transmission assembly. The drive motor is electrically connected to the controller.

[0011] The aforementioned water-rich roadbed compaction testing device includes a sliding transmission assembly comprising multiple sets of integrally formed protrusions disposed on the inner ring wall of the drive ring. The bottom of the same set of protrusions is fixedly connected to an arc-shaped guide slide plate. The mounting base is slidably connected to the groove wall of the arc-shaped guide slide plate, and the blade is disposed on the inner side of the arc-shaped guide slide plate.

[0012] In the aforementioned water-rich roadbed compaction testing device, the bottom of the annular top plate is fixed with multiple support legs, and the multiple support legs are all arranged on the outside of the support sleeve, with horizontal adjustment feet installed at the bottom of the support legs.

[0013] Compared with existing technologies, the present invention has the following advantages: 1. This invention, through the use of uniformly distributed ring-shaped blades and a pressure detection unit, can detect areas with acceptable compaction using a small number of sand-filled areas, determine the blade insertion friction resistance benchmark, and then use the pressure detection unit to push the blades into the roadbed to complete a rapid preliminary judgment of the roadbed compaction. It is suitable for rapid screening and detection of continuous compaction of large areas of roadbed, without the need for large-area excavation of the roadbed, reducing the frequency of damage sampling in the traditional sand-filled method, and effectively improving the efficiency of roadbed detection and construction rectification.

[0014] 2. The present invention, through its rotating drive unit, can perform annular cutting of the soil layer using the blade when determining the blade insertion friction resistance in the initial stage of the sand-filling method, or when using the sand-filling method to accurately test the compaction degree of the roadbed. This creates an annular cut on the outside of the sand-filling area, facilitating the rapid manual collection of soil samples from the sand-filling area. This improves upon the problem of soil settlement affecting the accuracy of compaction degree testing caused by traditional excavation methods. At the same time, due to the annular movement of the blade, the sidewall of the soil sample collection area can be scraped and coated during movement, blocking the free water seepage path in the soil. This can reduce the moisture change of the soil sample in the sand-filling area to a certain extent, which is beneficial to improving the accuracy of subsequent compaction degree calculations.

[0015] 3. This invention, through the setting of displacement probes and positioning columns, can detect the downward movement distance of the blade as it moves downward. This improves the problem that the average value of the blade insertion friction resistance may deviate too much due to different roadbed benchmarks in different testing areas and the possibility of local unevenness in the soil in the same testing area, thus affecting the accuracy of soil compaction testing. At the same time, it facilitates the smooth circular movement of each blade when driving the blade to rotate and cut the slit. Furthermore, since each blade is inserted individually, it can be combined with pressure testing to calculate the flatness of the roadbed at the testing point. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural schematic diagram of a water-rich roadbed compaction detection device provided by the present invention; Figure 2 This is a schematic diagram of the structure inside the annular top plate of the present invention; Figure 3 This is a schematic diagram of the connection structure between the blade and the pressure-applying electric push rod of the present invention; Figure 4 This is a schematic diagram showing the positions of the displacement probe and the positioning column of the present invention; Figure 5 yes Figure 2 Enlarged view of section A in the diagram; Figure 6 This is a schematic diagram of the connection structure between the transmission teeth and the gear of the present invention.

[0017] In the diagram: 1. Annular top plate; 2. Controller; 3. Blade; 4. Pressure detection unit; 41. Pressure electric push rod; 42. Mounting plate; 43. Pressure sensor; 5. Rotary drive unit; 51. Support sleeve; 52. Drive ring; 53. Support plate; 54. Drive motor; 55. Gear; 56. Transmission gear; 6. Suspension assembly; 61. Arc-shaped guide rail; 62. Suspension slider; 63. Mounting seat; 7. Screw; 8. Adjusting nut; 9. Support spring; 10. Displacement probe; 11. Positioning column; 12. Sliding transmission assembly; 121. Protrusion; 122. Arc-shaped guide slide plate; 13. Support leg; 14. Horizontal adjustment foot. Detailed Implementation

[0018] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0019] like Figure 1 and Figure 2 The device for testing the compaction degree of a water-rich roadbed includes an annular top plate 1 and a controller 2 fixed to the top of the annular top plate 1. The device also includes blades 3 and a rotary drive unit 5. There are three blades 3, which are evenly distributed in a ring below the annular top plate 1. The annular top plate 1 is equipped with a pressure detection unit 4, which is used to push the blades 3 into the soil layer and detect the frictional resistance encountered by the blades 3 during insertion. The rotary drive unit 5 is installed at the bottom of the annular top plate 1. The rotary drive unit 5 drives the blades 3 to rotate about the axis of the annular top plate 1. The blades 3 are arc-shaped and coaxial with the annular top plate 1. The blades 3 are made of high-strength stainless steel with a thickness of 3mm. Their side view projection is V-shaped and the outer edges are all sharpened.

[0020] In actual testing, this embodiment uses the pressure testing unit 4 to drive the blade 3 into the soil and calculates the average frictional resistance of multiple blades 3 inserted into the soil in the same area. By comparing this average frictional resistance with that of the blade 3 in the area with acceptable compaction, the compaction degree of the corresponding area can be quickly determined. This eliminates the need for large-scale excavation of the roadbed. Only the detection action of inserting the blade 3 into the soil is required to complete the large-scale screening of roadbed compaction, reducing the amount of soil excavation and improving testing efficiency. Furthermore, using multiple blades 3 to insert into the soil separately in the same area to test the frictional resistance can improve the accuracy of frictional resistance calculation.

[0021] like Figure 1 and Figure 3As shown, further in this embodiment, the pressure detection unit 4 includes multiple pressure electric push rods 41 that are inserted through the surface of the annular top plate 1. The movable end of the pressure electric push rod 41 is fixed with a mounting plate 42. A pressure sensor 43 and a suspension assembly 6 are provided below the mounting plate 42. The pressure sensor 43 is installed on the top of the suspension assembly 6, and the detection end of the pressure sensor 43 is fixedly connected to the mounting plate 42. The blade 3 can rotate relative to the pressure sensor 43 through the suspension assembly 6. The maximum effective stroke of the pressure electric push rod 41 is 300mm, which is suitable for standard sand filling detection depths of 150mm and 200mm. The detection accuracy of the pressure sensor 43 is 0.1N.

[0022] In actual testing, this embodiment uses a pressure-applying electric push rod 41 to push the blade 3 into the soil. With the help of a separately set pressure sensor 43, the frictional resistance of the soil to the blade 3 can be calculated simultaneously when the pressure sensor 43 detects the resistance of the soil to the blade 3. Since the roadbed cannot guarantee that each test point is sufficiently flat and the soil surface has uneven defects, the pressure-applying electric push rod 41 and the pressure sensor 43 are driven separately to ensure the accuracy of the frictional resistance experienced by the blade 3 when it is inserted into the soil each time. When the pressure sensor 43 detects that the pressure exceeds 150N, the controller 2 controls the pressure-applying electric push rod 41 to stop working, so as to avoid damage to the pressure-applying electric push rod 41 caused by the blade 3 being unable to move due to gravel or other debris in the soil.

[0023] like Figure 3 As shown, further, in this embodiment, the suspension assembly 6 includes an arc-shaped guide rail 61 fixed to the bottom of the pressure sensor 43. A suspension slider 62 is slidably connected in the guide rail groove of the arc-shaped guide rail 61. A mounting base 63 is fixed to the bottom of the suspension slider 62. The blade 3 is fixed to the bottom of the mounting base 63. The guide rail groove of the arc-shaped guide rail 61 has a T-shaped cross section, and the shape of the suspension slider 62 matches the cross section shape of the guide rail groove.

[0024] In actual testing, this embodiment uses the sliding cooperation between the arc-shaped guide rail 61 and the suspended slider 62 to enable the blade 3 to rotate circumferentially while maintaining the vertical detection positioning. This facilitates the dual-process operation of the blade 3 first vertically entering the soil for detection and then rotating circumferentially to cut the slit, without interfering with the accuracy of friction resistance detection or affecting the subsequent circumferential cutting of the soil layer.

[0025] like Figure 3 As shown, further, in this embodiment, a plurality of screws 7 are fixed on the upper surface of the arc-shaped guide rail 61. The screws 7 slide to the top of the mounting plate 42. An adjusting nut 8 is threadedly connected to the rod wall of the screw 7 at the position above the mounting plate 42. A plurality of support springs 9 are fixed between the mounting plate 42 and the upper surface of the arc-shaped guide rail 61.

[0026] In actual testing, this embodiment uses screw 7, adjusting nut 8 and support spring 9 to support components such as arc guide rail 61, suspension slider 62, mounting base 63 and blade 3. This balances the weight of the components below pressure sensor 43, so that pressure sensor 43 is not pulled by vertical gravity when not in operation. This can minimize the problems of plastic deformation, zero point offset and accuracy decay caused by long-term tension and compression of the internal detection element of pressure sensor 43, and ensure the stability of sensor detection accuracy.

[0027] like Figure 4 As shown, further, in this embodiment, multiple displacement probes 10 are fixed at the bottom of the annular top plate 1, and the multiple displacement probes 10 are evenly distributed in a ring about the axis of the annular top plate 1. The top of the arc-shaped guide rail 61 is fixed with a positioning post 11 corresponding to the position of the displacement probe 10. The displacement probe 10 is electrically connected to the controller 2. The displacement probe 10 adopts an infrared high-precision ranging probe with a ranging accuracy of 0.5mm.

[0028] In actual testing, this embodiment uses a one-to-one distance measurement combination between the displacement probe 10 and the positioning column 11 to independently monitor the soil penetration distance of each blade 3. This minimizes testing deviations caused by uneven roadbed surfaces and inconsistent ground references at different testing points, ensuring that each set of blades 3 can accurately penetrate to an effective soil depth of 150mm. This prevents deviations in frictional resistance data due to excessively shallow or deep penetration, thus improving the accuracy of roadbed compaction testing. Simultaneously, since the three blades 3 are inserted into the soil individually, the displacement probe 10 detects the movement distance of the three blades 3 before they touch the ground. The difference between the maximum and minimum movement distances can be calculated to determine the ground flatness of the testing area. When the ground flatness exceeds 5mm, the controller 2 issues a warning.

[0029] like Figure 2 , Figure 5 and Figure 6As shown, in this embodiment, the rotary drive unit 5 includes a support sleeve 51 fixed to the bottom of the annular top plate 1. A drive ring 52 is rotatably connected to the lower inner side of the support sleeve 51. A support plate 53 is fixed to the outer side wall of the support sleeve 51. A drive motor 54 is fixed to the surface of the support plate 53. The lower end of the output shaft of the drive motor 54 extends rotatably to the bottom of the support sleeve 51 and is fixedly connected to a gear 55. A plurality of evenly distributed transmission teeth 56 are fixed to the outer ring surface of the drive ring 52. The drive ring 52 meshes with the gear 55 through the transmission teeth 56. A sliding transmission assembly 12 is installed on the drive ring 52. The blade 3 rotates synchronously with the drive ring 52 through the mounting base 63 and the sliding transmission assembly 12. The drive motor 54 is electrically connected to the controller 2. The drive motor 54 is a stepper motor. A rotation angle encoder and a torque sensor are installed on its output shaft. When the torque reaches 8 N·m, the controller 2 controls the drive motor 54 to stop working to prevent the blade 3 from being blocked by gravel or other debris in the soil and causing damage to the drive motor 54. The rotation speed is constant at 5° / s.

[0030] In actual testing, this embodiment uses a drive motor 54, gear 55, and transmission gear 56 to drive the drive ring 52 to rotate. In conjunction with the sliding transmission assembly 12, the blade 3 can rotate in a ring direction, thereby making a ring cut in the sand-filled area. Traditional manual drilling for soil extraction relies on hammering the soil, which can easily apply downward pressure to the soil in the sand-filled area during the operation, changing the original compaction state of the soil and causing deviations in subsequent compaction test results. Especially for water-rich roadbeds, the soil itself has high water content, soft structure, poor cementation, and weak resistance to disturbance. Manual excavation will increase the deviation of compaction test results. Therefore, the ring cutting method using the blade 3 is less likely to press down on the soil in the sand-filled area, which is conducive to improving the accuracy of subsequent compaction test. Meanwhile, during the ring cutting process, the blade can scrape and squeeze to seal the seepage gaps on the surface of the soil, which can block the free water inside the water-rich roadbed from seeping out as much as possible, reduce the water loss and moisture content fluctuation during soil sample collection and storage, reduce the interference of humidity changes on compaction degree calculation, and help improve the accuracy and stability of compaction degree detection of water-rich roadbed.

[0031] like Figure 5 and Figure 6 As shown, further, in this embodiment, the sliding transmission assembly 12 includes multiple sets of integrally formed protrusions 121 disposed on the inner ring wall of the drive ring 52. The bottom of the same set of protrusions 121 is fixedly connected to an arc-shaped guide slide plate 122. The mounting base 63 is slidably connected to the groove wall of the arc-shaped guide slide plate 122. The blade 3 is disposed on the inner side of the arc-shaped guide slide plate 122.

[0032] In actual testing, this embodiment uses the limiting and guiding effect of the protrusion 121 and the arc-shaped guide slide plate 122 to transmit rotational force to the mounting base 63, so that the blade 3 rotates stably. Secondly, the arc-shaped guide slide plate 122 can form a shielding layer on the outside of the blade 3, so that personnel are less likely to come into contact with the blade 3 when it is not in use or when the device is being moved, thus improving the safety of the device. A detachable protective sleeve (not shown in the figure) is installed on the arc-shaped guide slide plate 122 to isolate and protect the blade 3 when it is not in use.

[0033] like Figure 1 As shown, in this embodiment, a plurality of support legs 13 are fixed to the bottom of the annular top plate 1, and the plurality of support legs 13 are all arranged on the outside of the support sleeve 51. A horizontal adjustment foot 14 is installed at the bottom of the support leg 13. Before the test, the levelness of the annular top plate 1 can be detected by a bubble level (not shown in the figure).

[0034] In actual testing, this embodiment uses the support leg 13 and the horizontal adjustment foot 14 to level the device, ensuring the verticality of the blade 3 entering the soil and reducing the impact of uneven roadbed on the testing.

[0035] The operation process of the present invention is as follows: Taking the excavation of a sand-filling hole with a depth of 150mm as an example, after the roadbed compaction construction, a detection point is selected and the entire device is placed at the detection point. At the same time, the annular top plate 1 is leveled by the horizontal adjustment foot 14 in conjunction with the support leg 13. The controller 2 is powered by an external power supply and the controller 2 is started. The controller 2 controls the pressure electric push rod 41 to drive the mounting plate 42, pressure sensor 43 and suspension assembly 6 to move the blade 3 downward. The displacement probe 10 emits a ranging beam, which, together with the positioning column 11, reflects the ranging beam, and can detect the downward distance of the blade 3 in real time. When the blade 3 moves downward and contacts the soil, the downward movement of the blade 3 is resisted. At this time, the pressure detected by the pressure sensor 43 increases, and the pressure sensor 43 converts the pressure signal into an electrical signal and feeds it back to the controller 2 in real time. After the pressure sensor 43 detects that the pressure has increased, the displacement probe 10 detects that the blade 3 continues to move down a distance of 150mm. Then, the controller 2 controls the corresponding pressure electric push rod 41 to stop working and calculates the average value of the electrical signal corresponding to the frictional resistance experienced by the blade 3 when it is inserted into the soil, as detected by the pressure sensor 43. After all the blades 3 have been inserted, the controller 2 calculates the average value of the electrical signal corresponding to the frictional resistance experienced by the three blades 3 when they are inserted into the soil. Because the roadbed surface may be uneven and the roadbed reference is different in different detection areas, the actual overall downward movement distance of each blade 3 is not the same. In order to make a uniform cut in the sand-filled area, the controller 2 will calculate the average value of the overall downward movement distance of the blade 3 and control the pressure electric push rod 41 to drive each blade 3 to move to the uniform height represented by the average distance. Then, the controller 2 controls the drive motor 54 to work. The drive motor 54 drives the drive ring 52 to rotate through the gear 55 and the transmission gear 56. The drive ring 52 applies rotational driving force to the mounting base 63 through the protrusion 121 and the arc-shaped guide slide plate 122. Since the top of the mounting base 63 is slidably connected to the arc-shaped guide rail 61 through the suspension slider 62, the blade 3 can move in a ring at the bottom of the arc-shaped guide rail 61 with the mounting base 63. After the three blades 3 have rotated 120°, the controller 2 controls the drive motor 54 to stop working. At this time, a complete ring cut is formed in the sand-filled area. The testing personnel dug a pit from the ring-shaped cut into the inside of the sand-filling area to collect soil samples, and stored the soil samples in sealed bags and other containers. Then, they collected soil samples from the entire soil body within a 150mm depth range inside the test pit, sealed and stored the collected soil samples, determined the soil moisture content by the drying method, and calculated the test pit volume, soil wet density and dry density by the sand-filling method. Finally, they accurately calculated the actual compaction degree of the roadbed at this point. Select at least 3 qualified test points (compaction degree of water-rich roadbed ≥95%) that have passed the sand cone test. Collect the average friction resistance data of the blade 3 inserted into the soil layer at each group of points. Calculate the arithmetic mean of the friction resistance of the three grid points. Set this value as the standard friction resistance benchmark value for roadbed compaction test in this section. After the benchmark value is calibrated, the rapid screening operation of the compaction degree of the entire roadbed can be carried out. The specific screening process is as follows: Place the device at each screening point on the roadbed in sequence, level the equipment, and start the test. The controller 2 controls the pressure electric push rod 41 to drive the blade 3 into the soil layer at a uniform speed. Collect and calculate the average frictional resistance of the blade 3 throughout the entire process of entering the soil in real time. Compare the measured frictional resistance with the preset standard frictional resistance benchmark value. If the measured average frictional resistance is lower than 85% of the benchmark value, it is determined that the soil moisture content at this point is too high and the soil is loose. The compaction degree is likely not to meet the 95% specification requirement, which is a weak area of ​​the roadbed. The soil in this area needs to be turned over, dried, and compacted. If the measured average frictional resistance is greater than or equal to 85% of the benchmark value, it is determined that the roadbed at this point is uniformly compacted and the density meets the standard. There is no need to repeat the damage test. Only routine sampling and data retention are required.

[0036] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A device for detecting the compaction degree of a water-rich roadbed, comprising an annular top plate (1) and a controller (2) fixed to the top of the annular top plate (1), characterized in that, Also includes: Multiple blades (3) are evenly distributed in a ring below the annular top plate (1). The annular top plate (1) is equipped with a pressure detection unit (4), which is used to push the blades (3) into the soil layer and detect the frictional resistance encountered by the blades (3) during insertion. A rotary drive unit (5) is installed at the bottom of the annular top plate (1). The rotary drive unit (5) drives the blade (3) to rotate about the axis of the annular top plate (1). The blade (3) is arc-shaped and the blade (3) is coaxial with the annular top plate (1).

2. The device for detecting the compaction degree of water-rich roadbed according to claim 1, characterized in that, The pressure detection unit (4) includes multiple pressure electric push rods (41) that penetrate and insert into the surface of the annular top plate (1). The movable end of the pressure electric push rod (41) is fixed with a mounting plate (42). A pressure sensor (43) and a suspension assembly (6) are provided below the mounting plate (42). The pressure sensor (43) is installed on the top of the suspension assembly (6), and the detection end of the pressure sensor (43) is fixedly connected to the mounting plate (42). The blade (3) can rotate relative to the pressure sensor (43) through the suspension assembly (6).

3. The device for detecting the compaction degree of water-rich roadbed according to claim 2, characterized in that, The suspension assembly (6) includes an arc-shaped guide rail (61) fixed to the bottom of the pressure sensor (43), a suspension slider (62) is slidably connected in the guide rail groove of the arc-shaped guide rail (61), a mounting base (63) is fixed to the bottom of the suspension slider (62), and the blade (3) is fixed to the bottom of the mounting base (63).

4. The device for detecting the compaction degree of water-rich roadbed according to claim 3, characterized in that, The upper surface of the arc-shaped guide rail (61) is fixed with a plurality of screws (7), which slide to the top of the mounting plate (42). The rod wall of the screw (7) is threaded with an adjusting nut (8) at the position above the mounting plate (42). A plurality of support springs (9) are fixed between the mounting plate (42) and the upper surface of the arc-shaped guide rail (61).

5. The device for detecting the compaction degree of water-rich roadbed according to claim 3, characterized in that, Multiple displacement probes (10) are fixed at the bottom of the annular top plate (1), and the multiple displacement probes (10) are evenly distributed in a ring about the axis of the annular top plate (1). The top of the arc-shaped guide rail (61) is fixed with a positioning column (11) corresponding to the position of the displacement probe (10). The displacement probe (10) is electrically connected to the controller (2).

6. The device for detecting the compaction degree of water-rich roadbed according to claim 3, characterized in that, The rotary drive unit (5) includes a support sleeve (51) fixed to the bottom of the annular top plate (1). A drive ring (52) is rotatably connected to the lower inner side of the support sleeve (51). A support plate (53) is fixed to the outer wall of the support sleeve (51). A drive motor (54) is fixed to the surface of the support plate (53). The lower end of the output shaft of the drive motor (54) extends rotatably to the bottom of the support sleeve (51) and is fixedly connected to a gear (55). A plurality of evenly distributed transmission teeth (56) are fixed to the outer ring surface of the drive ring (52). The drive ring (52) meshes with the gear (55) through the transmission teeth (56). A sliding transmission assembly (12) is installed on the drive ring (52). The blade (3) rotates synchronously with the drive ring (52) through the mounting base (63) and the sliding transmission assembly (12). The drive motor (54) is electrically connected to the controller (2).

7. The device for detecting the compaction degree of water-rich roadbed according to claim 6, characterized in that, The sliding transmission assembly (12) includes multiple sets of integrally formed protrusions (121) on the inner ring wall of the drive ring (52). The bottom of the same set of protrusions (121) is fixedly connected to an arc-shaped guide slide plate (122). The mounting base (63) is slidably connected to the groove wall of the arc-shaped guide slide plate (122). The blade (3) is disposed on the inner side of the arc-shaped guide slide plate (122).

8. The device for detecting the compaction degree of water-rich roadbed according to claim 6, characterized in that, The bottom of the annular top plate (1) is fixed with multiple support legs (13), and the multiple support legs (13) are all located on the outside of the support sleeve (51). The bottom of the support legs (13) is equipped with a horizontal adjustment foot (14).

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