Sampling device for detecting water content of earth roadbed

Abstract

This invention discloses a sampling device for detecting the moisture content of earthwork roadbeds, comprising: a support assembly, which includes a bottom support, a top mounting plate, and a telescopic support forming a frame-shaped support; a spiral auger, which is mounted on the lower center of the top mounting plate via a spiral auger mounting frame; a pair of sampling components, which are respectively disposed on both sides of the spiral auger mounting frame, each sampling component including, from top to bottom, a lifting rod connected to the spiral auger mounting frame at its top, a spring assembly connected to the bottom of the lifting rod, and a sampling bucket engaged with the bottom of the spring assembly, both sampling buckets being open on the sides facing the spiral auger, and the lowest point of the sampling bucket not lower than the lowest point of the spiral auger; and a secondary sampling auxiliary assembly, which includes a spray assembly and a blower assembly mounted on the top mounting plate via a reciprocating screw and respectively located on both sides of the pair of sampling components. This invention can scientifically and stably control the sampling depth and quickly perform secondary sampling.

Description

Technical Field

[0001] This invention relates to the technical field of auxiliary devices for roadbed construction. More specifically, this invention relates to a sampling device for detecting the moisture content of earthwork roadbeds. Background Technology

[0002] The roadbed is the foundation of the track or pavement, primarily bearing the static and dynamic loads of traffic loads from the track, pavement, locomotives, and other vehicles, and transferring and dispersing these loads to the depth of the foundation. The moisture content of the roadbed directly affects construction stability; therefore, it is necessary to test the moisture content of the earthwork roadbed. Existing sampling devices for testing the moisture content of earthwork roadbeds have two major drawbacks: first, the sampling depth is unscientific and uncontrollable; second, rapid secondary sampling is not possible. For example, in the invention patent with publication number CN109115547A, publication date of January 1, 2019, and titled "Sampling Device for Detecting Moisture Content in Earthwork Subgrade," the sampling device for detecting moisture content in earthwork subgrade includes a sampling tube, a base, a left support plate, a right support plate, a top plate, a movable plate, a drive motor, and two sets of lead screws. Vertical sliding grooves are respectively provided on the right side of the left support plate and the left end of the right support plate. A left slider and a right slider are respectively provided on the left and right ends of the movable plate. The left slider and the right slider slide up and down along the left and right sliding grooves, respectively. The top plate and the base are equipped with corresponding ball bearings. The top ends of the two sets of lead screws are inserted into the two sets of ball bearings from the bottom ends of the top plate and the bottom ends of the two sets of lead screws from the bottom ends of the top plate, respectively. It can be seen that the sampling device for detecting the moisture content of earthwork roadbed disclosed in the above-mentioned invention patent cannot overcome the defects of unscientific and uncontrollable sampling depth, nor can it overcome the defects of not being able to quickly perform secondary sampling. Similarly, the invention with publication number CN109355991A, publication date of 2019.02.19, and titled "A Sampling Device for Detecting Moisture Content of Earthwork Roadbed" also has similar defects. Summary of the Invention

[0003] One object of the present invention is to solve at least the above-mentioned problems and to provide at least the advantages that will be described later.

[0004] Another objective of this invention is to provide a sampling device for detecting the moisture content of earthwork roadbeds, which can both scientifically and stably control the sampling depth and quickly perform secondary sampling.

[0005] To achieve these objectives and other advantages according to the present invention, a sampling device for detecting the moisture content of earthwork subgrade is provided, comprising:

[0006] A support assembly, comprising a bottom support, a top mounting plate, and a telescopic support forming a frame-shaped support;

[0007] The spiral auger is mounted on the lower center of the top mounting plate via a spiral auger mounting bracket.

[0008] A pair of sampling components are respectively set on both sides of the spiral auger mounting frame. Each sampling component includes, from top to bottom, a lifting rod connected to the spiral auger mounting frame at the top, a spring assembly connected to the bottom of the lifting rod, and a sampling bucket snapped into the bottom of the spring assembly. The sides of the sampling buckets facing the spiral auger are open, and the lowest point of the sampling bucket is not lower than the lowest point of the spiral auger.

[0009] A secondary sampling auxiliary component includes a spray component and a blower component, which are mounted on a top mounting plate via a reciprocating screw and located on either side of a pair of sampling components.

[0010] The bottom support has an opening located directly below the auger and a pair of sampling components. The sum of the adjustable distance of the lifting rod and the maximum compression distance of the spring assembly is not greater than the adjustable distance of the telescopic support.

[0011] Preferably, the auger is driven by a servo motor; the auger mounting frame includes a servo motor protection frame connected to a top mounting plate and a horizontal extension frame connected to the servo motor protection frame, the servo motor is located inside the servo motor protection frame and connected to the top mounting plate, and the output shaft of the servo motor passes through the horizontal extension frame and is connected to the top of the auger.

[0012] Preferably, the bottom of the spring assembly is provided with a buckle, and the top of the sampling hopper is provided with a buckle groove that matches the buckle.

[0013] Preferably, the two sampling hoppers are provided with matching grooves and protrusions on opposite sides.

[0014] Preferably, the spray assembly includes a water tank connected to a top mounting plate via a reciprocating screw, a spray pipe facing the auger, and a nozzle disposed at the end of the spray pipe. The water tank is provided with a water inlet, and the spray pipe is provided with a micro pump.

[0015] Preferably, the blower assembly includes a blower connected to a top mounting plate via a reciprocating screw and a pair of airflow outlets disposed on the blower, the airflow outlets facing the auger.

[0016] The present invention further claims a sampling method for detecting the moisture content of highway earthwork subgrade based on the aforementioned sampling device for detecting the moisture content of earthwork subgrade, comprising:

[0017] Step 1: Based on the sampling locations along the highway, determine the drilling depth of the auger; the sampling locations and the drilling depth of the auger satisfy the following relationship:

[0018] When the sampling location is located at a distance of no more than 1 / 3 of the horizontal distance between the roadbed centerline and the slope, the drilling depth of the auger is 5~10cm;

[0019] When the sampling location is located at a horizontal distance from the centerline of the roadbed that is greater than 1 / 3 of the horizontal distance between the centerline of the roadbed and the slope but less than 2 / 3 of the horizontal distance between the centerline of the roadbed and the slope, the drilling depth of the auger is 11~20cm.

[0020] When the sampling location is at a horizontal distance of not less than 2 / 3 of the horizontal distance between the roadbed centerline and the slope, the drilling depth of the auger is 21~30cm.

[0021] Step 2: Adjust the extension distance of the lifting rod according to the drilling depth of the auger, and install the sampling bucket at the bottom of the spring assembly with the open side of the sampling bucket facing the auger. Start the servo motor and press down on the top mounting plate at the same time. The telescopic bracket retracts downward, causing the auger to drill downward. During the drilling process, soil samples splash into the sampling bucket. When the auger can no longer move upward, turn off the servo motor, remove the sampling bucket, and engage the two sampling buckets with the groove and protrusion.

[0022] Step 3: Start the reciprocating screw to lower the spray assembly and blower assembly below the spring assembly to clean and dry the auger respectively, and then return the reciprocating screw to its original position.

[0023] Step 4: Move the sampling device for detecting the moisture content of the earthwork subgrade to the next sampling location, and repeat steps 1 to 3 to perform a second sampling.

[0024] Preferably, the drilling depth of the auger in step one is equal to the sum of the maximum compression distance of the spring assembly, the adjustable distance of the lifting rod, and the distance difference between the lowest point of the sampling bucket and the lowest point of the auger.

[0025] The present invention has at least the following beneficial effects:

[0026] The sampling device for detecting the moisture content of earthwork subgrade provided by this invention can scientifically and stably control the sampling depth according to the different sampling positions (horizontal distance from the centerline of the subgrade), overcoming the defect of unstable moisture content detection values ​​at positions far from the centerline of the subgrade, making the detection values ​​of moisture content of earthwork subgrade more accurate and stable.

[0027] The sampling device for detecting the moisture content of earthwork roadbed provided by the present invention realizes the quick assembly and disassembly of the sampling bucket, and is equipped with a spiral auger for quick cleaning of the spray assembly and a blower assembly, enabling rapid secondary sampling.

[0028] The spring assembly in the sampling device for detecting the moisture content of earthwork roadbed provided by this invention not only serves as a buffer and protection for the drilling of the auger, but also controls the drilling depth of the auger.

[0029] The sampling device for detecting the moisture content of earthwork subgrade provided by this invention can protect the sampling environment and operators without the need for additional protective baffles.

[0030] Other advantages, objectives and features of the present invention will become apparent in part from the following description, and in part from those skilled in the art through study and practice of the invention. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the sampling device for detecting the moisture content of earthwork roadbed as described in one of the technical solutions of the present invention. Detailed Implementation

[0032] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0033] It should be understood that terms such as “having,” “comprising,” and “including” used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0034] like Figure 1 As shown, the present invention provides a sampling device for detecting the moisture content of earthwork roadbed, comprising:

[0035] A support assembly comprising a frame-shaped support formed by a bottom support 11, a top mounting plate 1, and a telescopic support 12;

[0036] The spiral auger 10 is mounted on the lower part of the middle of the top mounting plate 1 via a spiral auger mounting bracket;

[0037] A pair of sampling components are respectively set on both sides of the spiral auger mounting frame. Each sampling component includes, from top to bottom, a lifting rod 3 connected to the spiral auger mounting frame at the top, a spring group 7 connected to the bottom of the lifting rod 3, and a sampling bucket 8 snapped into the bottom of the spring group 7. The sides of the sampling buckets 8 facing the spiral auger 10 are open, and the lowest point of the sampling bucket 8 is not lower than the lowest point of the spiral auger 10.

[0038] A secondary sampling auxiliary assembly includes a spray assembly and a blower assembly, which are mounted on a top mounting plate via a reciprocating screw 18 and are located on either side of a pair of sampling assemblies, respectively.

[0039] The bottom support 11 has an opening 9 located directly below the spiral auger 10 and a pair of sampling components. The sum of the adjustable distance of the lifting rod 3 and the maximum compression distance of the spring assembly 7 is not greater than the adjustable distance of the telescopic support 12.

[0040] In the above technical solution, the sampling device for detecting the moisture content of the earthwork subgrade includes a retractable support assembly, a sampling assembly, a pair of sampling auxiliary assemblies, and a secondary sampling auxiliary assembly. The support assembly includes a bottom support 11, a top mounting plate 1, and a pair of telescopic supports 12 located between the bottom support 11 and the top mounting plate 1. The pair of telescopic supports are located on both sides of the bottom support 11 and the top mounting plate 1, enabling the top mounting plate 1 to move vertically relative to the bottom support 11. To facilitate operation of the top mounting plate 1, those skilled in the art will readily conceive of adding a top... A handle is provided on the mounting plate 1; soil sampling mainly relies on the auger 10, which is driven by the servo motor 16. The servo motor 16 is installed in the lower middle part of the top mounting plate. In order to facilitate the installation of a pair of sampling auxiliary components, the present invention also provides an auger mounting frame. The auger mounting frame is located below the top mounting plate 1. In order to protect the servo motor 16, install a pair of sampling auxiliary components, and reduce the weight of the entire device, the auger mounting frame is divided into two parts: the upper part is the servo motor protection frame 2 and the lower part is the horizontal extension frame 15. A pair of sampling auxiliary components are installed on both sides of the horizontal extension frame 15 to ensure that the pair of sampling auxiliary components do not contact the auger 10. Each sampling auxiliary component includes a lifting rod 3, a spring assembly 7, and a sampling bucket 8 arranged from top to bottom. The natural drilling depth of the auger 10 includes the compression distance of the spring assembly 7 and the height difference between the sampling bucket and the bottom of the auger 10 in its natural state. Generally, the sum of the compression distance of the spring assembly 7 and the height difference between the sampling bucket and the bottom of the auger 10 in its natural state exceeds 30cm, and the compression distance of the spring assembly 7 does not exceed 5cm. The function of the lowering rod 3 is to adjust the drilling depth of the auger 10. Specifically, the drilling depth of the auger 10 can be adjusted to below 30cm using the lowering rod 3 (the attached diagram only shows a structural schematic and does not represent dimensional relationships). Based on the horizontal distance between the sampling location and the roadbed centerline, the drilling depth of the auger 10 is determined. Then, the downward extension distance of the lowering rod 3 is further adjusted to reduce the height difference between the sampling bucket 8 and the auger 10, ensuring that the drilling depth of the auger 10 equals the sum of the compression distance of the spring assembly 7 and the height difference between the sampling bucket 8 and the bottom of the auger 10 in its current state. In practical applications, the compressible distance of the lowering rod 3, the compressible distance of the spring assembly 7, and the height difference between the sampling bucket 8 and the auger 10 in its natural state can be appropriately adjusted. The spring assembly 7 serves both as a buffer for the drilling of the auger 10 and as a fine-tuning tool to ensure that the drilling depth matches the preset depth. The sampling hopper 8 adopts a semi-cylindrical structure with left and right interlocking, which makes it convenient to start collecting soil samples and saves material feeding time for secondary sampling; the secondary sampling auxiliary component cleans and dries the lower end of the spiral auger 10 after sampling, so as to facilitate rapid secondary sampling.

[0041] In the above technical solution, the method of using the sampling device for detecting the moisture content of the earthwork subgrade is as follows: First, determine the drilling depth of the auger 10. In this technical solution, the drilling depth of the auger 10 is determined according to the sampling position. Generally speaking, the closer the location is to the centerline of the subgrade, the better the stability of the moisture content of the earthwork subgrade, and the shallower the sampling depth. The farther the location is from the centerline of the subgrade, the worse the stability of the moisture content of the earthwork subgrade, and the deeper the sampling depth. After determining the drilling depth of the auger 10, calculate the compression distance of the spring assembly 7 and the height difference between the sampling bucket 8 and the auger 10 in the natural state, and then adjust the height of the lifting rod 3 downward to meet the distance required for the drilling depth of the auger 10. Push the top mounting plate 1 downward and rotate... The auger 10 rotates downwards from the opening 9 until the sampling hopper 8 stops rising, at which point the auger 10 stops rotating. During the rotation of the auger 10, before reaching the sampling depth, the servo motor 16 rotates slowly, and a small amount of soil splashes. Once the sampling depth is reached, the servo motor 16 rotates faster, and the soil splashes into the sampling hopper 8 under greater centrifugal force. Carefully remove the two sampling hoppers 8 and snap them together. Lift the top mounting plate 1 upwards until the auger 10 is restored, and lower the spray and blower components to spray and dry it. Move the earthwork subgrade moisture content testing sampling device, install a new sampling hopper 8, and repeat the above steps for secondary sampling.

[0042] like Figure 1 As shown, in one technical solution, the auger 10 is driven by a servo motor 16; the auger mounting frame includes a servo motor protection frame 2 connected to a top mounting plate and a horizontal extension frame 15 connected to the servo motor protection frame. The servo motor 16 is located inside the servo motor protection frame 2 and connected to the top mounting plate 1. The output shaft of the servo motor 16 passes through the horizontal extension frame 15 and connects to the top of the auger 10. The auger mounting frame is divided into upper and lower parts. The upper part is a hollow servo motor protection frame, which protects the servo motor 16. The lower part is the horizontal extension frame 15, which is used to connect a pair of sampling auxiliary components, greatly reducing the weight of the auger mounting frame and making the operation of the entire sampling device more flexible.

[0043] exist Figure 1 In one technical solution, the spring assembly 7 has a buckle at its bottom, and the sampling hopper 8 has a buckle groove at its top that matches the buckle. The buckle and the buckle groove are engaged in a direction perpendicular to the extending direction of the auger 10, extending inwards. The spring assembly 7 and the sampling hopper 8 are connected by a buckle structure, and the buckle structure is engaged in a direction perpendicular to the extending direction of the auger 10 (e.g., ...). Figure 1As shown, the direction perpendicular to the paper is front and back, and the direction parallel to the paper is left and right (i.e., front and back snapping, not left and right snapping). The up and down movement of the sampling bucket 8 does not affect the stability of the snapping, which improves the stability of the auxiliary sampling component. At the same time, the snapping structure can achieve quick loading and unloading without delaying the time for secondary sampling.

[0044] Figure 1 As can be seen from this, in one of the technical solutions, the two sampling hoppers 8 are respectively provided with matching grooves and protrusions on opposite sides, which is conducive to the rapid collection of soil samples.

[0045] Depend on Figure 1 It can be seen that in one of the technical solutions, the spray assembly includes a water tank 5 connected to the top mounting plate 1 via a reciprocating screw 18, a spray pipe 6 facing the auger 10, and a nozzle set at the end of the spray pipe. The water tank 5 is provided with a water inlet 17, and the spray pipe 6 is provided with a micro pump 4. After the sampling bucket 8 is disassembled, the end of the auger 10 that is drilled down is exposed. The height of the spray assembly is adjusted by the reciprocating screw 18 so that it is directly flushing the end of the auger 10 that is drilled down, so that it can quickly perform secondary sampling.

[0046] like Figure 1 As shown, in one of the technical solutions, the blower assembly includes a blower 13 connected to a top mounting plate 1 via a reciprocating screw and a pair of airflow outlets 14 disposed on the blower 13. The airflow outlets 14 face the auger 10. By adjusting the height of the blower assembly by the reciprocating screw, it is made to dry the end of the auger 10 that is drilling downwards. The pair of airflow outlets can quickly dry the auger 10, enabling it to be quickly sampled again.

[0047] The present invention further claims a sampling method for detecting the moisture content of highway earthwork subgrade based on the aforementioned sampling device for detecting the moisture content of earthwork subgrade, comprising:

[0048] Step 1: Based on the sampling locations along the highway, determine the drilling depth of the auger; the sampling locations and the drilling depth of the auger satisfy the following relationship:

[0049] When the sampling location is located at a distance of no more than 1 / 3 of the horizontal distance between the roadbed centerline and the slope, the drilling depth of the auger is 5~10cm;

[0050] When the sampling location is located at a horizontal distance from the centerline of the roadbed that is greater than 1 / 3 of the horizontal distance between the centerline of the roadbed and the slope but less than 2 / 3 of the horizontal distance between the centerline of the roadbed and the slope, the drilling depth of the auger is 11~20cm.

[0051] When the sampling location is at a horizontal distance of not less than 2 / 3 of the horizontal distance between the roadbed centerline and the slope, the drilling depth of the auger is 21~30cm.

[0052] Step 2: Adjust the extension distance of the lifting rod according to the drilling depth of the auger, and install the sampling bucket at the bottom of the spring assembly with the open side of the sampling bucket facing the auger. Start the servo motor and press down on the top mounting plate at the same time. The telescopic bracket retracts downward, causing the auger to drill downward. During the drilling process, soil samples splash into the sampling bucket. When the auger can no longer move upward, turn off the servo motor, remove the sampling bucket, and engage the two sampling buckets with the groove and protrusion.

[0053] Step 3: Start the reciprocating screw to lower the spray assembly and blower assembly below the spring assembly to clean and dry the auger respectively, and then return the reciprocating screw to its original position.

[0054] Step 4: Move the sampling device for detecting the moisture content of the earthwork subgrade to the next sampling location, and repeat steps 1 to 3 to perform a second sampling.

[0055] In the above technical solution, there is only one influencing factor on the sampling location in step one, namely the horizontal distance S from the sampling location to the roadbed centerline. Taking the horizontal distance L from the roadbed centerline to the slope as the total distance, the sampling locations are divided into three levels: S≤1 / 3L, 1 / 3L<S<2 / 3L, and S≥2 / 3L. The corresponding drilling depths of the auger in the three levels are 5~10cm, 11~20cm, and 21~30cm, respectively. In step two, to facilitate the downward pushing of the top mounting bracket, a handle can be added to the top mounting bracket. The auger drilling process is divided into two stages. The first stage is the unbuffered protection stage, that is, the stage when the sampling bucket descends into the opening of the bottom bracket, which is used for rapid drilling, but the rotation speed of the auger 10 is relatively low. The second stage is the buffer protection stage. In this stage, the rotation speed of the auger is higher, but the slow compression process of the elastic group can reduce the damage to the deep sampling environment caused by high-speed rotation. Step three is used to quickly restore the auger to the working state and quickly carry out secondary sampling work, effectively saving construction time.

[0056] In one of the technical solutions, the drilling depth of the auger in step one is equal to the sum of the maximum compression distance of the spring assembly, the adjustable distance of the lifting rod, and the distance difference between the lowest point of the sampling bucket and the lowest point of the auger. The drilling depth consists of three parts, which helps to distinguish between the rapid drilling process and the gentle drilling process, and is beneficial to the protection of the sampling environment.

[0057] Example 1

[0058] The first sampling location is less than 1 / 3 of the horizontal distance between the roadbed centerline and the slope centerline. The drilling depth of the auger is set to 26cm. The sampling bucket is installed with the side without the side plate facing the auger. The top mounting plate is pressed downwards to allow the auger to drill downwards. During drilling, soil samples splash into the sampling bucket. The auger reaches the sampling bucket and cannot move upwards. The sampling bucket is removed, and the two sampling buckets are engaged with the protrusions through the grooves. The reciprocating screw is activated, lowering the spray assembly and blower assembly below the spring assembly to clean and dry the auger (a wastewater collection box can be placed at the opening to avoid affecting the earthwork roadbed). The reciprocating screw returns to its original position. The soil sample is then moved downwards. The sampling device for detecting the moisture content of the earthwork subgrade is moved to the second sampling position. The line connecting the second and first sampling positions is parallel to the centerline of the subgrade, meaning the distances from the centerline to the second and first sampling positions are equal. The drilling depth of the auger is set to 8 cm. The above steps are repeated for a second sampling. The sampling device for detecting the moisture content of the earthwork subgrade is moved to the third sampling position. The line connecting the third and first sampling positions is parallel to the centerline of the subgrade, meaning the distances from the centerline to the third and first sampling positions are equal. The drilling depth of the auger is set to 16 cm. The above steps are repeated for a third sampling. A soil sample is taken from the upper layer of soil in the three sampling buckets for moisture content detection, with a relative error not exceeding 2%.

[0059] Example 2

[0060] The first sampling position is at a horizontal distance greater than 2 / 3 of the horizontal distance between the road centerline and the slope. The drilling depth of the auger is set to 7cm. The sampling bucket is installed with the side without the side plate facing the auger. The top mounting plate is pressed downwards to allow the auger to drill downwards. During drilling, soil samples splash into the sampling bucket. When the auger reaches the sampling bucket and cannot move upwards, the sampling bucket is removed. The two sampling buckets are engaged by the groove and protrusion. The reciprocating screw is activated to lower the spray assembly and blower assembly below the spring assembly, cleaning and drying the auger respectively. The reciprocating screw is then reset. The earthwork roadbed moisture content testing sampling device is moved to the second sampling position. The line connecting the second and first sampling positions is parallel to the roadbed centerline, meaning the distances from the second and first sampling positions to the roadbed centerline are equal. The drilling depth of the auger is set to 15cm. The above steps are repeated for a second sampling. The earthwork roadbed moisture content testing sampling device is moved to the third sampling position, where the line connecting the third and first sampling positions is parallel to the roadbed centerline, meaning the distances from the third and first sampling positions to the roadbed centerline are equal. The drilling depth of the auger is set to 23cm. The above steps are repeated for a third sampling. A topsoil sample is taken from the soil in the three sampling buckets for moisture content testing, with a minimum relative error of 11.772%.

[0061] As can be seen from Examples 1 and 2, it is scientific to distinguish the sampling location in order to determine the drilling depth of the auger. For sampling locations close to the centerline of the roadbed, there is no need to drill too deep, which would waste time and effort. For sampling locations far from the centerline of the roadbed, sufficient drilling depth must be ensured to ensure the accuracy of moisture content detection.

[0062] The number of devices and processing capacity described herein are for simplification of the invention. Applications, modifications, and variations of the sampling device for detecting the moisture content of earthwork subgrade according to this invention will be readily apparent to those skilled in the art.

[0063] As described above, according to the present invention, the present invention includes at least the following beneficial effects:

[0064] The sampling device for detecting the moisture content of earthwork subgrade provided by this invention can scientifically and stably control the sampling depth according to the different sampling positions (horizontal distance from the centerline of the subgrade), overcoming the defect of unstable moisture content detection values ​​at positions far from the centerline of the subgrade, making the detection values ​​of moisture content of earthwork subgrade more accurate and stable.

[0065] The sampling device for detecting the moisture content of earthwork roadbed provided by the present invention realizes the quick assembly and disassembly of the sampling bucket, and is equipped with a spiral auger for quick cleaning of the spray assembly and a blower assembly, enabling rapid secondary sampling.

[0066] The spring assembly in the sampling device for detecting the moisture content of earthwork roadbed provided by this invention not only serves as a buffer and protection for the drilling of the auger, but also controls the drilling depth of the auger.

[0067] The sampling device for detecting the moisture content of earthwork subgrade provided by this invention can protect the sampling environment and operators without the need for additional protective baffles.

[0068] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A sampling device for detecting the moisture content of earthwork roadbed, characterized in that, include: A support assembly, comprising a bottom support, a top mounting plate, and a telescopic support forming a frame-shaped support; The spiral auger is mounted on the lower center of the top mounting plate via a spiral auger mounting bracket. A pair of sampling components are respectively set on both sides of the spiral auger mounting frame. Each sampling component includes, from top to bottom, a lifting rod connected to the spiral auger mounting frame at the top, a spring assembly connected to the bottom of the lifting rod, and a sampling bucket snapped into the bottom of the spring assembly. The sides of the sampling buckets facing the spiral auger are open, and the lowest point of the sampling bucket is not lower than the lowest point of the spiral auger. A secondary sampling auxiliary component includes a spray component and a blower component, which are mounted on a top mounting plate via a reciprocating screw and located on either side of a pair of sampling components. The bottom support has an opening located directly below the auger and a pair of sampling components. The sum of the adjustable distance of the lifting rod and the maximum compression distance of the spring assembly is not greater than the adjustable distance of the telescopic support.

2. The sampling device for detecting the moisture content of earthwork subgrade as described in claim 1, characterized in that, The auger is driven by a servo motor; the auger mounting frame includes a servo motor protection frame connected to a top mounting plate and a horizontal extension frame connected to the servo motor protection frame. The servo motor is located inside the servo motor protection frame and connected to the top mounting plate. The output shaft of the servo motor passes through the horizontal extension frame and is connected to the top of the auger.

3. The sampling device for detecting the moisture content of earthwork subgrade as described in claim 2, characterized in that, The bottom of the spring assembly is provided with a buckle, and the top of the sampling hopper is provided with a buckle groove that matches the buckle.

4. The sampling device for detecting the moisture content of earthwork subgrade as described in claim 3, characterized in that, The two sampling hoppers on opposite sides are provided with matching grooves and protrusions.

5. The sampling device for detecting the moisture content of earthwork subgrade as described in claim 4, characterized in that, The spray assembly includes a water tank connected to a top mounting plate via a reciprocating screw, a spray pipe facing the auger, and a nozzle disposed at the end of the spray pipe. The water tank is provided with a water inlet, and the spray pipe is provided with a micro pump.

6. The sampling device for detecting the moisture content of earthwork subgrade as described in claim 5, characterized in that, The blower assembly includes a blower connected to a top mounting plate via a reciprocating screw and a pair of airflow outlets on the blower, the airflow outlets facing the auger.

7. A sampling method for detecting the moisture content of highway earthwork subgrade based on the sampling device for detecting the moisture content of earthwork subgrade according to any one of claims 1 to 6, characterized in that, include: Step 1: Based on the sampling locations along the highway, determine the drilling depth of the auger; the sampling locations and the drilling depth of the auger satisfy the following relationship: When the sampling location is located at a distance of no more than 1 / 3 of the horizontal distance between the roadbed centerline and the slope, the drilling depth of the auger is 5~10cm; When the sampling location is located at a horizontal distance from the centerline of the roadbed that is greater than 1 / 3 of the horizontal distance between the centerline of the roadbed and the slope but less than 2 / 3 of the horizontal distance between the centerline of the roadbed and the slope, the drilling depth of the auger is 11~20cm. When the sampling location is at a horizontal distance of not less than 2 / 3 of the horizontal distance between the roadbed centerline and the slope, the drilling depth of the auger is 21~30cm. Step 2: Adjust the extension distance of the lifting rod according to the drilling depth of the auger, and install the sampling bucket at the bottom of the spring assembly, with the open side of the sampling bucket facing the auger. Start the servo motor and press down on the top mounting plate at the same time. The telescopic bracket retracts downward, causing the auger to drill downward. During the drilling process, soil samples splash into the sampling bucket. When the auger has drilled to the point where the sampling bucket can no longer move upward, turn off the servo motor, remove the sampling bucket, and engage the two sampling buckets with the groove and protrusion. Step 3: Start the reciprocating screw to lower the spray assembly and blower assembly below the spring assembly to clean and dry the auger respectively, and then return the reciprocating screw to its original position. Step 4: Move the sampling device for detecting the moisture content of the earthwork subgrade to the next sampling location, and repeat steps 1 to 3 to perform a second sampling.

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