Sampling device for highway subgrade compactness test detection

Abstract

The utility model belongs to the technical field of compaction degree sampling detection, particularly relates to a sampling device for highway subgrade compaction degree test detection, and provides the following scheme aiming at the problems of chip removal blockage, difficulty in pulling of the device and difficulty in complete cutting of a sample during sampling of an undisturbed soil sample: the sampling device comprises a sampling barrel assembly and a cutting ring assembly, the sampling barrel assembly adopts a sampling outer barrel and a sampling outer pipe which are detachably sleeved, and a chip removal gap is formed between the sampling outer barrel and the sampling outer pipe; the cutting ring assembly is arranged at the bottom of the cutting unit, a soil sample area cut by the cutting unit directly faces the chip removal gap, so that cut waste soil can be smoothly discharged, meanwhile, the formed hole diameter is larger than the outer diameter of the sampling outer pipe, the pulling resistance is reduced, the clutch butt joint assembly is arranged, and in the sampling process, through separation of a driving friction disc and a driven friction disc, the sampling efficiency is improved. The built-in sampling inner cylinder is kept static, so that the soil sample is ensured to enter without being disturbed; when the soil sample is full, the two friction discs are tightly abutted to drive the sampling inner cylinder to rotate synchronously, and the bottom of the soil sample in the cylinder is tidily twisted off by torque.

Description

TECHNICAL FIELD

[0001] The utility model relates to a sampling device, concretely is a kind of sampling device for highway subgrade compaction degree test detection, belong to compaction degree sampling detection technical field. BACKGROUND

[0002] In the field of highway subgrade engineering quality detection, compaction degree is the core index for evaluating subgrade filling quality and ensuring long-term stability of road, and its accurate determination depends on obtaining undisturbed original soil sample from the site. In the prior art, using sleeve device for coring sampling is one of the main methods to obtain original soil sample.

[0003] In the prior art, such as the drilling device with sampling function disclosed in the announcement No. CN218991520U, which adopts the combined design of splicing drill rod and splicing sampling sleeve, and realizes flexible expansion of drilling depth through threaded connection. Although the device improves the adaptability of sampling for deep soil layer, when the sampling sleeve cuts into dense subgrade, the soil body generated by cutting directly enters the inside of the sleeve or accumulates around the cylinder wall, resulting in great frictional resistance between the outer wall of the sleeve and the hole wall, making it extremely difficult to operate the subsequent pulling-out of the entire device from the subgrade, and the excessive resistance may also cause extrusion disturbance to the taken soil sample during pulling-out. For example, the novel undisturbed original soil sampling device disclosed in the announcement No. CN210603970U, which sets multiple independent sampling cylinders in the sampling sleeve and uses a sealing block controlled by an electromagnet to attempt to realize layered sampling and sample isolation. This design focuses on the separation and sealing of samples, but the core sampling action still relies on external pressure to press the soil into the static sampling cylinder. For highway subgrade fillers with high strength and tight intergranular embedding, the pressing process is prone to cause local compression and shear failure of the soil sample, making it difficult to ensure the so-called "undisturbed" effect. At the same time, this device also does not solve the fundamental problem of excessive friction between the sampling sleeve and the surrounding soil.

[0004] In summary, the existing sleeve-type sampling technology generally has two key defects: first, the sampling mechanism itself is prone to compression or shear disturbance to the structural subgrade soil, affecting the undisturbed nature of the soil sample; second, the close fit between the sampling sleeve and the hole wall after sampling results in a large frictional resistance, causing difficulty in pulling out the coring device, and possibly causing secondary disturbance to the sample during this process. UTILITY MODEL CONTENTS

[0005] The utility model provides a sampling device for highway subgrade compaction degree test detection to solve the problem of chip removal blockage, device pulling difficulty and sample complete interception during original soil sampling.

[0006] The utility model discloses a sampling device for highway roadbed compactness test detection, including sampling cylinder subassembly and the cutting ring subassembly of being connected at its bottom, sampling cylinder subassembly is equipped with the detachable sleeve of sampling outer tube and sampling outer pipe, is provided with sampling inner tube in sampling outer tube, and is provided with the clutch docking subassembly between sampling outer tube and sampling inner tube, and sampling inner tube is in the static state in the sampling process, and sampling inner tube is synchronous rotation with sampling outer tube through the clutch docking subassembly when the sampling process ends.

[0007] The cutting ring subassembly includes a sleeve ring unit and a plurality of cutting units connected to the bottom end of the sleeve ring unit. The cutting unit includes an inner cutting blade, an outer cutting blade, and a sharp end shovel. The sleeve ring unit is connected to the bottom end of the sampling outer tube and the sampling outer pipe. The soil sample area cut by the cutting unit is located directly below the gap between the sampling outer tube and the sampling outer pipe.

[0008] The clutch docking subassembly includes a driving friction disc and a driven friction disc arranged vertically. The driving friction disc and the driven friction disc are in a separated state during the sampling process. The driving friction disc and the driven friction disc are in a close docking state when the sampling is completed.

[0009] As a further scheme of the utility model, the top end of the sampling outer tube is outwardly convex and located above the sampling outer pipe. The top end of the sampling outer tube is fixedly connected with a soil retaining cover. The soil retaining cover is inclined downward and covers the top of the sampling outer pipe.

[0010] As a further scheme of the utility model, the outer wall of the sampling outer tube is vertically fixedly connected with a plurality of groove-shaped docking strips arranged uniformly in a ring shape. The inner wall of the sampling outer pipe is vertically fixedly connected with a plurality of docking clamping strips arranged uniformly in a ring shape. When the sampling outer tube and the sampling outer pipe are in a sleeved state, the docking clamping strips and the groove-shaped docking strips are clamped together.

[0011] As a further scheme of the utility model, the strip body of the docking clamping strips and the groove-shaped docking strips is connected with a plurality of locking bolts. The locking bolts also threadedly penetrate the sampling outer tube and the sampling outer pipe.

[0012] As a further scheme of the utility model, the end of the locking bolt close to the sampling inner tube is embedded with a ball. The outer wall of the sampling inner tube is provided with an annular sliding groove. When the locking bolt is in a threadedly locked state of the sampling outer tube and the sampling outer pipe, the ball is clamped in the annular sliding groove.

[0013] As a further scheme of the utility model, the bottom end outer wall of the sampling outer tube and the bottom end inner wall of the sampling outer pipe are both provided with an annular recess. The bottom end of the sampling outer tube and the bottom end of the sampling outer pipe are threadedly connected with a locking bolt. The locking bolt penetrates the sleeve ring unit.

[0014] As a further scheme of the utility model: the sleeve ring unit includes an outer butt joint ring and an inner butt joint ring, the outer butt joint ring is clamped in the inner groove at the bottom end of the sampling outer tube, and the inner butt joint ring is clamped in the inner groove at the bottom end of the sampling outer cylinder.

[0015] As a further scheme of the utility model: the cutting units are uniformly distributed in a ring shape, the pointed end shovel is fixedly connected between the inner cutting blade and the outer cutting blade, the inner cutting blade and the inner butt joint ring are connected with an inwardly inclined inclined surface bottom ring, and the outer cutting blade and the outer butt joint ring are connected with an outwardly inclined inclined surface bottom ring.

[0016] As a further scheme of the utility model: the top surface center of the sampling outer cylinder is fixedly connected with a power joint, the driving friction disc is located in the cylinder of the sampling outer cylinder, the driving friction disc and the power joint are coaxially fixedly connected, the clutch butt joint assembly further comprises a push plate movably arranged in the sampling inner cylinder, the driven friction disc is located outside the cylinder of the sampling inner cylinder, the driven friction disc and the push plate are connected with a square connecting rod, and the rod body of the square connecting rod movably penetrates the top surface of the sampling inner cylinder.

[0017] The utility model has the advantages of:

[0018] 1. The utility model discloses a soil sampling device, which comprises a sampling cylinder assembly and a cutting ring assembly connected at the bottom end of the sampling cylinder assembly.

[0019] 2. The cutting ring assembly comprises a sleeve ring unit and a plurality of cutting units connected to the bottom end of the sleeve ring unit, the cutting unit comprises an inner cutting blade, an outer cutting blade and a pointed shovel, the sleeve ring unit is connected to the bottom end of the sampling outer cylinder and the sampling outer tube respectively, the soil sample area cut by the cutting unit is located directly below the gap between the sampling outer cylinder and the sampling outer tube, the inner cutting blade and the outer cutting blade serve as the leading cutting edge and can cut a clear annular cutting mark on the soil body in advance, then the pointed shovel shovels the bottom of the annular soil column isolated by the cutting mark, the cutting and shoveling mode of cutting first and then shoveling reduces the extrusion on the side wall of the predetermined soil sample and the disturbance to the surrounding soil body, and ensures the original structure of the soil sample; secondly, the cutting area is located directly below the chip removal gap, which can ensure that the hole diameter cut is greater than the outer diameter of the sampling outer tube, so that there is an annular gap between the outer tube and the roadbed hole wall after the device completes sampling, the contact area and static friction force between the device and the soil body are greatly reduced, so that the subsequent vertical pulling out of the entire device from the dense hole is more labor-saving and convenient.

[0020] 3. The clutch butt joint assembly comprises a driving friction disc and a driven friction disc vertically arranged upward and downward, the driving friction disc and the driven friction disc are in a separated state during sampling, and the driving friction disc and the driven friction disc are in a close butt joint state at the end of sampling, during sampling, the driving friction disc and the driven friction disc are separated, the power only drives the sampling outer cylinder and the sampling outer tube to rotate and cut, and the sampling inner cylinder remains stationary and receives the original columnar soil sample which is shovelled and not disturbed by torsion, so that the appearance of the soil sample is maintained, when the soil sample continuously enters and fills the sampling inner cylinder, the driven friction disc is forced to move away and tightly butt joints with the continuously rotating driving friction disc. At this moment, the rotating power is transmitted to the sampling inner cylinder to make it rotate, the torque acts on the bottom of the columnar soil sample, so that the columnar soil sample is twisted off at the connection between the bottom and the lower soil body, thereby realizing efficient cutting of the predetermined length of the complete soil sample and providing a high-quality sample for subsequent compaction degree test. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall appearance structure of the utility model;

[0022] Figure 2 It is a sectional structure schematic diagram of the sampling cylinder assembly of the utility model;

[0023] Figure 3 It is a schematic diagram of the structure of the utility model; Figure 2

[0024] Figure 4 It is a sectional structure schematic diagram of the sampling outer cylinder and the sampling outer tube of the utility model;

[0025] Figure 5 It is a sectional structure schematic diagram of the sampling outer cylinder and the sampling outer tube of the utility model;

[0026] ​Figure 6 is a partial structure schematic view of the sampling inner cylinder of the utility model;

[0027] Figure 7 is a structure schematic view of the locking bolt of the utility model;

[0028] Figure 8 is a structure schematic view of the clutching butt joint assembly in the separated state of the utility model;

[0029] Figure 9 is a structure schematic view of the clutching butt joint assembly in the close butt joint state of the utility model;

[0030] Figure 10 is a partial structure schematic view of the sampling cylinder assembly and the cutting unit in the separated state of the utility model;

[0031] Figure 11 is a structure schematic view of the cutting unit of the utility model.

[0032] In the drawing: 1, sampling cylinder assembly; 11, sampling outer cylinder; 12, sampling outer pipe; 13, sampling inner cylinder; 14, groove-shaped butt joint strip; 15, butt joint clamping strip; 16, locking bolt; 17, inner groove; 18, locking bolt; 19, annular sliding groove; 110, ball; 2, cutting ring assembly; 21, outer butt joint ring; 22, inner butt joint ring; 23, inclined surface bottom ring; 24, cutting unit; 241, inner cutting blade; 242, outer cutting blade; 243, pointed end spade; 3, soil blocking cover; 4, power joint; 5, clutching butt joint assembly; 51, driving friction disc; 52, driven friction disc; 53, square connecting rod; 54, push plate. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0034] Embodiment one

[0035] As Figures 1 to 11As shown, a sampling device for highway subgrade compaction test detection, comprising a sampling cylinder assembly 1 and a cutting ring assembly 2 connected at the bottom end thereof, the sampling cylinder assembly 1 is provided with a detachable and sleeved sampling outer cylinder 11 and a sampling outer tube 12, a sampling inner cylinder 13 is arranged in the sampling outer cylinder 11, a clutching butt joint assembly 5 is arranged between the sampling outer cylinder 11 and the sampling inner cylinder 13, the sampling inner cylinder 13 is in a static state during sampling, and the sampling inner cylinder 13 rotates synchronously with the sampling outer cylinder 11 through the clutching butt joint assembly 5 at the end of the sampling process, by designing the sampling cylinder assembly 1 as a detachable and sleeved sampling outer cylinder 11 and a sampling outer tube 12, an annular gap is created between the cylinder walls of the two, which can make the cutting waste generated during cutting be discharged upward through the gap, avoid the blockage of the discharge, ensure the smoothness of the sampling process, and reduce the power required for drilling and the operation strength;

[0036] The cutting ring assembly 2 comprises a sleeve ring unit and a plurality of cutting units 24 connected at the bottom end thereof, the cutting unit 24 comprises an inner cutting blade 241, an outer cutting blade 242 and a pointed shovel 243, the sleeve ring unit is connected at the bottom end of the sampling outer cylinder 11 and the sampling outer tube 12, the soil sample area cut by the cutting unit 24 is located directly below the gap between the sampling outer cylinder 11 and the sampling outer tube 12, the inner cutting blade 241 and the outer cutting blade 242 serve as the leading cutting edge and can cut a clear annular cutting mark on the soil body in advance, and then the pointed shovel 243 shovels up the bottom of the annular soil column isolated by the cutting mark, forming a cutting and then shoveling off mode to reduce the extrusion on the side wall of the predetermined soil sample and the disturbance on the surrounding soil body, and ensuring the original structure of the soil sample; secondly, the cutting area is located directly below the discharge gap, which can ensure that the hole diameter cut is greater than the outer diameter of the sampling outer tube 12, so that there is an annular gap between the outer tube of the device and the subgrade hole wall after the sampling is completed, the contact area and static friction force between the device and the soil body are greatly reduced, thereby making it more labor-saving and convenient to vertically pull out the entire device from the dense hole subsequently;

[0037] The clutch-and-connection assembly 5 includes an active friction disk 51 and a driven friction disk 52 arranged vertically. During sampling, the active and driven friction disks 51 and 52 are separated, and at the end of sampling, they are tightly connected. During sampling, the active and driven friction disks 51 and 52 are separated, and the power only drives the outer sampling cylinder 11 and outer sampling tube 12 to rotate and cut, while the inner sampling cylinder 13 remains stationary, serving as a fixed cylinder to receive the scooped-up, undisturbed original columnar soil sample, preserving its original shape. As the soil sample continuously enters and fills the inner sampling cylinder 13, it forces the driven friction disk 52 to move upwards, tightly connecting with the continuously rotating active friction disk 51. At this moment, the rotational power is transmitted to the inner sampling cylinder 13, causing it to rotate. The torque acts on the bottom of the columnar soil sample, causing it to break at the connection point between the bottom and the lower soil layer, thus achieving efficient cutting of a complete soil sample of a predetermined length, providing a high-quality sample for subsequent compaction tests.

[0038] Example 2

[0039] Improvements based on Example 1:

[0040] like Figures 1 to 7 As shown, the top of the sampling outer cylinder 11 is convex and located above the sampling outer tube 12. A soil retainer 3 is fixedly connected to the top wall of the sampling outer cylinder 11. The soil retainer 3 is inclined downward and covers the sampling outer tube 12. During high-speed rotating sampling, the soil particles discharged upward from the gap between the sampling outer cylinder 11 and the sampling outer tube 12 often have a certain speed and splashing. The downwardly inclined soil retainer 3 can effectively block the upward splashing soil particles, prevent them from polluting the operating environment, splashing onto the operator or interfering with the view, and guide the soil particles to fall along the preset path instead of accumulating on the top of the device, avoiding the possible jamming of rotating parts or increased rotational load caused by soil particle accumulation.

[0041] Further, the outer wall of the sampling outer cylinder 11 is vertically fixedly connected with a plurality of annularly and uniformly distributed groove-shaped abutment strips 14, the inner wall of the sampling outer tube 12 is vertically fixedly connected with a plurality of annularly and uniformly distributed abutment clamping strips 15, and when the sampling outer cylinder 11 and the sampling outer tube 12 are in a sleeved state, the abutment clamping strips 15 and the groove-shaped abutment strips 14 are clamped together. When sleeved and assembled, the operator can easily align and insert the plurality of abutment clamping strips 15 on the sampling outer tube 12 into the corresponding groove-shaped abutment strips 14 on the sampling outer cylinder 11, achieving rapid primary positioning. When subjected to a huge torsional shear force from the cutting process, the embedded structure can transmit torque through the side contact of the strip and the groove, preventing relative rotation between the sampling outer cylinder 11 and the sampling outer tube 12, and ensuring that the power is transmitted from the sampling outer cylinder 11 to the sampling outer tube 12 and then to the cutting ring assembly 2. At the same time, the multi-point and uniformly distributed strip-groove connection method makes the sampling cylinder assembly 1 less likely to deform when pressed into hard or uneven roadbeds, ensuring the regularity of the sample.

[0042] Further, the abutment clamping strips 15 and the groove-shaped abutment strips 14 are clamped together. The body of the abutment clamping strips 15 is connected with a plurality of locking bolts 16, and the locking bolts 16 also threadedly penetrate the sampling outer cylinder 11 and the sampling outer tube 12. The locking bolts 16 sequentially penetrate the abutment clamping strips 15, the groove-shaped abutment strips 14, and are threadedly connected with the sampling outer cylinder 11 and the sampling outer tube 12, so that the sampling outer cylinder 11 and the sampling outer tube 12 become an integral force-bearing component that can withstand axial pressure and upward pulling force.

[0043] Further, the end of the locking bolt 16 close to the sampling inner cylinder 13 is embedded with a ball 110, and the outer wall of the sampling inner cylinder 13 is provided with an annular sliding groove 19. When the locking bolt 16 is in a state of threadedly locking the sampling outer cylinder 11 and the sampling outer tube 12, the ball 110 is clamped in the annular sliding groove 19. When the locking bolt 16 is locked, the ball 110 embedded in the end of the locking bolt 110 is embedded in the annular sliding groove 19 of the outer wall of the sampling inner cylinder 13. The ball 110 and the smooth annular sliding groove 19 form a bearing pair with low frictional resistance, providing radial support for the sampling inner cylinder 13 to prevent it from shaking or eccentricity due to stress inside the sampling outer cylinder 11, ensuring the coaxiality of the sampling inner cylinder 13 and the sampling outer cylinder 11, and thus ensuring that the soil sample can smoothly and centrally enter the sampling inner cylinder 13. The ball 110 clamped in the annular sliding groove 19 can prevent the sampling inner cylinder 13 from moving up and down or falling out significantly. When the clutching abutment assembly 5 is not engaged, it does not hinder the free rotation of the sampling inner cylinder 13.

[0044] Further, the bottom end outer wall of the sampling outer cylinder 11 and the bottom end inner wall of the sampling outer tube 12 are both provided with an annular inner groove 17, the bottom end of the sampling outer cylinder 11 and the bottom end of the sampling outer tube 12 are threadedly connected with a locking bolt 18, and the locking bolt 18 penetrates the collar unit, the annular inner groove 17 provides an annular positioning step and a bearing surface for the collar unit, during installation, only the corresponding part of the collar unit needs to be clamped into the inner groove 17 to realize the concentric centering of the cutting ring assembly 2, the sampling outer cylinder 11 and the sampling outer tube 12, and the cutting resistance borne by the cutting ring assembly 2 is transmitted to the cylinder body of the sampling outer cylinder 11 and the sampling outer tube 12 through the bearing surface of the inner groove 17 and the pre-tightening force of the locking bolt 18, thereby avoiding stress concentration.

[0045] As shown in Figure 2 , Figures 8 to 11 The collar unit includes an outer butt joint ring 21 and an inner butt joint ring 22, the outer butt joint ring 21 is clamped in the inner groove 17 provided at the bottom end of the sampling outer tube 12, and the inner butt joint ring 22 is clamped in the inner groove 17 provided at the bottom end of the sampling outer cylinder 11, the outer butt joint ring 21 is responsible for connecting with the bottom end of the sampling outer tube 12, and the inner butt joint ring 22 is responsible for connecting with the bottom end of the sampling outer cylinder 11 on the outer side of the sampling inner cylinder 13, which ensures that the cutting track of the inner cutting blade 241 supported by the inner butt joint ring 22 and the cutting track of the outer cutting blade 242 supported by the outer butt joint ring 21 are respectively aligned with the sampling outer cylinder 11 and the sampling outer tube 12, thereby ensuring that a cutting area with uniform width and accurate position is formed.

[0046] Further, the plurality of cutting units 24 are uniformly distributed in an annular shape, the pointed end shovel 243 is fixedly connected between the inner cutting blade 241 and the outer cutting blade 242, an inwardly inclined inclined surface bottom ring 23 is connected between the inner cutting blade 241 and the inner butt joint ring 22, and an outwardly inclined inclined surface bottom ring 23 is connected between the outer cutting blade 242 and the outer butt joint ring 21, the inner cutting blade 241 and the outer cutting blade 242 serve as a guide to draw a clear annular cutting mark on the soil body with small resistance, thereby pre-separating the lateral connection between the target soil sample and the surrounding soil body, and then the pointed end shovel 243 acts on the bottom of the annular soil column isolated by the cutting mark to shovel it up, thereby forming a step-by-step operation mode of cutting first and then shoveling off, which maximally reduces the extrusion and disturbance to the soil body outside the predetermined sampling boundary, thereby ensuring that the edge of the taken soil sample is clear and the structure remains original; in addition, the inclined surface bottom ring 23 constitutes a smooth transition surface from the blade root to the chip removal gap, which effectively guides the cut soil chips upward and to the center of the gap, promotes the smooth entry of the soil chips into the chip removal channel and the upward movement along the chip removal channel, and optimizes the chip removal efficiency.

[0047] Further, the top center of the sampling outer cylinder 11 is fixedly connected with a power joint 4, the driving friction disc 51 is located in the cylinder of the sampling outer cylinder 11, and the driving friction disc 51 is coaxially fixedly connected with the power joint 4, the clutching butt joint assembly 5 further comprises a push plate 54 movably arranged in the sampling inner cylinder 13, the driven friction disc 52 is located outside the cylinder of the sampling inner cylinder 13, and the square connecting rod 53 is connected between the driven friction disc 52 and the push plate 54, the rod body of the square connecting rod 53 movably penetrates the top surface of the sampling inner cylinder 13, the power joint 4 is coaxially fixed with the driving friction disc 51, the rotation power of the external driving device is ensured to be input without loss, the driven friction disc 52 is rigidly connected with the push plate 54 in the sampling inner cylinder 13 through the square connecting rod 53, the square section of the square connecting rod 53 can not only transmit axial thrust but also transmit torque, during the sampling process, the soil sample continuously enters the stationary sampling inner cylinder 13 and gradually pushes the push plate 54 upward; when the soil sample fills the sampling inner cylinder 13, the upward displacement of the push plate 54 reaches a threshold value, the driven friction disc 52 is lifted to be tightly pressed with the continuously rotating driving friction disc 51 through the square connecting rod 53; the huge friction force between the two friction discs makes the driven friction disc 52, the square connecting rod 53, the push plate 54 and the entire sampling inner cylinder 13 rotate synchronously, which can ensure that sufficient torsional breaking force is applied to the bottom of the soil sample in the sampling inner cylinder 13 to complete the sampling cutting operation.

[0048] Working principle: the external driving device drives the sampling outer cylinder 11 and the sampling outer pipe 12 fixedly connected with the butt joint strip 15 and the butt joint bar 14 to rotate downward synchronously through the power joint 4, the cutting ring assembly 2 installed at the bottom starts to work, the inner cutting blade 241 and the outer cutting blade 242 first cut out a ring-shaped boundary on the soil body, and then the pointed shovel 243 shovels the bottom of the ring-shaped soil column to form a soil sample; the ring-shaped waste soil generated by cutting is smoothly discharged upward through the annular gap between the sampling outer cylinder 11 and the sampling outer pipe 12 and is protected and guided by the soil blocking cover 3; at the same time, the undisturbed soil sample is continuously entered into the inside of the sampling inner cylinder 13;

[0049] During the sampling process, the clutching butt joint assembly 5 is in a separated state, the driving friction disc 51 rotates with the sampling outer cylinder 11 and the driven friction disc 52 remains stationary, which makes the sampling inner cylinder 13 remain stationary under the support of the ball 110 at the end of the locking bolt 16 and the annular sliding groove 19, thereby ensuring that the structure of the soil sample entering the sampling inner cylinder 13 is not disturbed by any rotation, when the soil sample fills the sampling inner cylinder 13, the top pushes the internal push plate 54 to move upward, the driven friction disc 52 is moved upward through the square connecting rod 53 and is tightly pressed with the continuously rotating driving friction disc 51; at this time, the rotation power is instantaneously transmitted to the sampling inner cylinder 13 through the friction butt joint, so that the sampling inner cylinder 13 suddenly rotates at high speed;

[0050] The rotation of the sampling inner cylinder 13 applies a strong torsional load to the bottom of the columnar soil sample which has been filled in its interior, and the soil sample is neatly twisted off at the weakest part where it is connected to the underlying soil body, completing automatic sampling. Since the aperture formed by the cutting unit 24 is larger than the outer diameter of the sampling outer tube 12, the pull-out resistance is significantly reduced, and the device is easily lifted out. After the cutting ring assembly 2 is removed by loosening the locking bolt 18, a complete and undisturbed cylindrical test soil sample can be obtained for compaction detection.

[0051] It is obvious for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and the present application can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be regarded as limiting the claims to which they relate.

[0052] In addition, it should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that those skilled in the art can understand.

Claims

1. A sampling device for highway subgrade compaction test detection, comprising a sampling cylinder assembly (1) and a cutting ring assembly (2) connected at the bottom end thereof, characterized in that: The sampling cylinder assembly (1) is provided with detachable sleeve-connected sampling outer cylinder (11) and sampling outer tube (12), the sampling inner cylinder (13) is arranged in the sampling outer cylinder (11), the sampling inner cylinder (13) and the sampling outer cylinder (11) are provided with clutch docking assembly (5), the sampling inner cylinder (13) is in static state during sampling, and the sampling inner cylinder (13) is synchronously rotated with the sampling outer cylinder (11) through the clutch docking assembly (5) at the end of sampling process; The cutting ring assembly (2) includes sleeve ring unit and a plurality of cutting units (24) connected at the bottom end thereof, the cutting unit (24) includes inner cutting blade (241), outer cutting blade (242) and sharp end shovel (243), the sleeve ring unit is connected at the bottom end of the sampling outer cylinder (11) and the sampling outer tube (12) respectively, and the soil sample area cut by the cutting unit (24) is located directly below the gap between the sampling outer cylinder (11) and the sampling outer tube (12); The clutch docking assembly (5) includes upper and lower vertically arranged driving friction disc (51) and driven friction disc (52), the driving friction disc (51) and the driven friction disc (52) are in separated state during sampling, and the driving friction disc (51) and the driven friction disc (52) are in close docking state at the end of sampling.

2. The sampling device for highway subgrade compactness test detection according to claim 1, characterized in that: The top end of the sampling outer cylinder (11) is outward convex and located above the sampling outer tube (12), the top end cylinder wall of the sampling outer cylinder (11) is fixedly connected with the soil retaining cover (3), and the soil retaining cover (3) is downwardly inclined and covers the sampling outer tube (12).

3. The sampling device for highway subgrade compactness test detection according to claim 1, characterized in that: The outer wall of the sampling outer cylinder (11) is vertically fixedly connected with a plurality of annularly and uniformly distributed groove-shaped docking strips (14), the inner wall of the sampling outer tube (12) is vertically fixedly connected with a plurality of annularly and uniformly distributed docking clamping strips (15), and when the sampling outer cylinder (11) and the sampling outer tube (12) are in sleeve-connected state, the docking clamping strips (15) and the groove-shaped docking strips (14) are clamped and connected together.

4. The sampling device for highway subgrade compactness test detection according to claim 3, characterized in that: The strip body of the docking clamping strip (15) and the groove-shaped docking strip (14) is connected with a plurality of locking bolts (16) in penetration, and the locking bolt (16) is also threaded through the sampling outer cylinder (11) and the sampling outer tube (12).

5. The sampling device for highway subgrade compactness test detection according to claim 4, characterized in that: The end of the locking bolt (16) close to the sampling inner cylinder (13) is embedded with a ball (110), the outer wall of the sampling inner cylinder (13) is provided with an annular sliding groove (19), and when the locking bolt (16) is in threaded locking state of the sampling outer cylinder (11) and the sampling outer tube (12), the ball (110) is clamped in the annular sliding groove (19).

6. The sampling device for highway sub-grade compactness test detection according to claim 1, characterized in that: The bottom end outer wall of the sampling outer cylinder (11) and the bottom end inner wall of the sampling outer tube (12) are both provided with annular recesses (17), the bottom end of the sampling outer cylinder (11) and the bottom end of the sampling outer tube (12) are threaded connected with locking bolts (18), and the locking bolts (18) penetrate the sleeve ring unit.

7. The sampling device for highway subgrade compactness test detection according to claim 6, characterized in that: The collar unit comprises an outer butt joint ring (21) and an inner butt joint ring (22), the outer butt joint ring (21) is clamped in the inner groove (17) at the bottom end of the sampling outer tube (12), and the inner butt joint ring (22) is clamped in the inner groove (17) at the bottom end of the sampling outer cylinder (11).

8. The sampling device for highway sub-grade compactness test detection according to claim 7, characterized in that: The cutting units (24) are evenly distributed in a ring shape, the tip spade (243) is fixedly connected between the inner cutting blade (241) and the outer cutting blade (242), the inner cutting blade (241) is connected with the inner butt joint ring (22) through an inwardly inclined inclined surface bottom ring (23), and the outer cutting blade (242) is connected with the outer butt joint ring (21) through an outwardly inclined inclined surface bottom ring (23).

9. The sampling device for highway sub-grade compactness test detection according to claim 1, characterized in that: The top surface of the sampling outer cylinder (11) is fixedly connected with a power joint (4), the driving friction disc (51) is located in the cylinder of the sampling outer cylinder (11), and the driving friction disc (51) is coaxially fixedly connected with the power joint (4), the clutch butt joint assembly (5) further comprises a push plate (54) movably arranged in the sampling inner cylinder (13), the driven friction disc (52) is located outside the cylinder of the sampling inner cylinder (13), and the driven friction disc (52) is connected with the push plate (54) through a square connecting rod (53), and the rod body of the square connecting rod (53) movably penetrates the top surface of the sampling inner cylinder (13).

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