A device and method for detecting subgrade compaction degree of soft soil foundation

Abstract

The application provides a kind of subgrade compaction degree detection device and method for soft soil foundation, it is related to compaction degree detection technical field, including base, cutting mechanism, sampling mechanism, drive mechanism, support mechanism and electronic scale, the middle part of the base is provided with gap, cutting mechanism and sampling mechanism all reach ground through gap position;Cutting mechanism can be inserted into ground and cut soil body, after cutting is completed, the soil body is taken out, multiple cutting in the same position downward can cut out the sampling hole of specified depth on ground;Sampling mechanism is used for inserting the bottom wall of sampling hole and reaches specified depth to sample, drive mechanism is used to drive cutting mechanism and sampling mechanism to lift, support mechanism supports and guides cutting mechanism and sampling mechanism, and electronic scale is placed on the base to weigh the weight of sample.The application facilitates sampling on the middle position of compacted layer and the bottom of compacted layer, while reducing disturbance to soil body to improve the accuracy of sampling.

Description

Technical Field

[0001] This invention relates to the field of compaction testing technology, and more specifically, to a device and method for testing the compaction of roadbeds for soft soil foundations. Background Technology

[0002] Widening the roadbed is a crucial step in road widening projects. It involves increasing the road width by filling one or both sides of the existing roadbed with new soil or laying structural layers to meet the demands of increased traffic flow or functional upgrades. Widened roadbeds are typically made of soft soil, requiring pre-compaction before subsequent construction. After compaction of the soft soil foundation, compaction testing is necessary to ensure the foundation's density meets standards. The most common method for testing this type of soft soil foundation is the ring cutter method, which involves using a ring cutter to cut into the soil to collect a sample, weighing the sample, determining its moisture content, and calculating its dry density and degree of compaction.

[0003] For conventional foundation compaction testing, sampling is only required on the compacted surface. However, for soft soil foundations, sampling is necessary not only on the surface but also in the middle and at the bottom of the compacted layer. Therefore, current sampling methods for soft soil foundations require excavating a trench of a specified depth on the ground, followed by workers entering the trench to collect samples using a ring cutter. This process presents several challenges: firstly, the trench needs to be large enough for workers to enter, resulting in significant excavation and subsequent backfilling work; secondly, the excavation process can easily disturb the soil within the foundation, affecting the accuracy of the sampling. Summary of the Invention

[0004] The purpose of this invention is to provide a device and method for testing the compaction degree of roadbed for soft soil foundations. The device uses a cutting mechanism to make multiple downward cuts at the same position on the ground to form sampling holes of a specified depth. Then, a sampling mechanism enters the sampling holes to take samples. This facilitates sampling at the middle and bottom of the compacted layer, reduces the workload in the sampling process, reduces disturbance to the soil, and improves the accuracy of sampling.

[0005] This invention is achieved through the following technical solution: a roadbed compaction testing device for soft soil foundations, comprising:

[0006] The base has rollers at all four corners of its bottom and a notch in the middle.

[0007] A cutting mechanism, comprising a drive sleeve and a cutting cylinder, wherein the drive sleeve is slidably disposed at the upper part of the notch in a vertical direction, and the cutting cylinder is fixedly disposed at the bottom of the drive sleeve and can extend into the notch; and a first pressing member is provided on both opposite sides of the top of the drive sleeve.

[0008] The sampling mechanism includes a drive rod and a sampling ring cutter. The drive rod is slidably disposed inside a drive sleeve. The sampling ring cutter is detachably disposed at the bottom end of the drive rod and located below the drive sleeve. A second pressing member is provided on both opposite sides of the top end of the drive rod. The second pressing member and the first pressing member are distributed alternately in sequence.

[0009] The driving mechanism includes a driving seat vertically mounted on a base, a driving block and a lifting component for driving the driving block to slide along the length direction of the driving seat are provided inside the driving seat, and a pressing component is provided on the driving block.

[0010] A support mechanism includes a column, a support seat on the column, a rotating seat on the support seat, a drive rod slidably disposed within the rotating seat, and a rotating assembly for driving the rotating seat to rotate on the support seat.

[0011] An electronic scale, which is mounted on a base and is capable of weighing samples;

[0012] The drive rod is provided with a first limiting strip along its own length direction, the drive sleeve is provided with a first limiting groove for the first limiting strip to slide, the drive sleeve is provided with a second limiting strip along its own length direction on the outside, and the rotating seat is provided with a second limiting groove for the second limiting strip to slide.

[0013] Furthermore, the pressing assembly includes a pressing frame and two pressing blocks. The pressing frame is fixedly mounted on the driving block, and the two pressing blocks are both located on the side of the pressing frame away from the driving block. The first pressing member includes a first connecting rod and a first pressing block, and the second pressing member includes a second connecting rod and a second pressing block. A fastening block is provided at the bottom of the pressing block, and both the first pressing block and the pressing block have fastening grooves for the fastening block to be inserted on the side near the fastening block.

[0014] Furthermore, a connector is provided at the top of the sampling ring cutter. The connector includes a connecting collar for being sleeved on the drive rod. The connecting collar is positioned above the sampling ring cutter and is fixedly connected to the sampling ring cutter via an arc-shaped connecting rod. A positioning bolt is provided on the connecting collar. A threaded hole for inserting the positioning bolt is provided on the drive rod. When the connecting collar abuts against the bottom end of the drive sleeve, the top surfaces of the first pressing block and the second pressing block are flush, and the sampling ring cutter is located at the top of the cutting cylinder.

[0015] Furthermore, the top of the drive sleeve is provided with a strip groove for the second connecting rod to pass through, and when the second connecting rod enters the strip groove, the sampling ring knife can be inserted into the cutting cylinder.

[0016] Furthermore, the cutting cylinder is equipped with a sealing member and a pushing member. The sealing member is used to prevent soil from entering the sampling ring cutter, and the pushing member is used to push the cut soil out of the cutting cylinder. The sealing member includes an annular step and multiple flexible fan-shaped pieces. The annular step is fixedly installed on the side wall of the cutting cylinder, and the multiple flexible fan-shaped pieces are distributed inside the annular step and can seal the inner circle of the annular step. The pushing member includes a pushing ring and two pushing rods. The pushing rods are slidably installed on the cutting cylinder and the bottom end of the pushing rods passes through the annular step. The pushing ring is fixedly installed at the end of the pushing rod located outside the annular step.

[0017] Furthermore, a pressing mechanism for driving the pressing rod to move downward is provided on one side of the base. The pressing mechanism includes a support frame, on which a drive cylinder and a drive frame are provided. The drive frame includes a pressing rod and arc-shaped pressing strips provided at both ends of the pressing rod.

[0018] Furthermore, a push-out piece is provided at the top of the push-out rod, and a return spring is connected between the push-out piece and the cutting cylinder. When the second pressing member is located directly below the pressing assembly, the two arc-shaped pressing bars are respectively located directly above the two push-out rods.

[0019] Furthermore, it also includes a receiving groove, which includes a fixed groove and a movable groove. The fixed groove is fixed on the base, and the movable groove is slidably disposed on the fixed groove and can extend into the notch. A rodless cylinder for driving the movable groove to move is provided on one side of the fixed groove.

[0020] Furthermore, a mounting rod for mounting a sampling ring cutter is slidably provided on the side of the support base away from the rotating base. The mounting rod has threaded holes for inserting positioning bolts. A scraper frame is provided on the column. Scraper plates are provided on both the upper and lower sides of the scraper frame. The bottom surface of the upper scraper plate is flush with the top surface of the sampling ring cutter, and the top surface of the lower scraper plate is flush with the bottom surface of the sampling ring cutter. A transverse electric cylinder is provided on the support base for driving the mounting rod to move closer to or away from the scraper frame.

[0021] The present invention also provides a detection method using the above-mentioned soft soil foundation roadbed compaction detection device, comprising the following steps:

[0022] S1. Push the base to the sampling position, press the drive sleeve with the pressing component to drive the cutting cylinder to insert into the ground, then drive the rotating seat to rotate with the rotating component to drive the cutting mechanism to rotate as a whole, and then drive the cutting mechanism to leave the ground to remove the cut soil. Repeat the above steps, cut the ground to a specified depth each time and remove the cut soil until a sampling hole of a specified depth is cut.

[0023] S2. Insert the cutting mechanism into the sampling hole again, drive the rotating seat to rotate through the rotating component, so that the second pressing member at the top of the sampling rod is aligned with the pressing component of the driving block, and press the sampling ring knife through the pressing component so that the sampling ring knife enters the specified depth in the sampling hole.

[0024] S3. Drive the cutting mechanism and sampling mechanism to move out of the sampling hole through the driving mechanism. After moving out, remove the connecting piece on the sampling ring from the driving rod, and then remove the cut soil from the cutting cylinder as a whole. At this time, the sampling ring is located in the cut soil.

[0025] S4. Clean the soil outside the sampling ring, then scrape the excess soil at the top and bottom of the sampling ring to level it, and finally put the remaining soil inside the sampling ring into the electronic scale for weighing.

[0026] S5. Divide the mass obtained by weighing by the volume of the sampling ring to obtain the wet density of the soil sample. Then calculate the dry density of the soil sample based on the moisture content and compare it with the maximum dry density measured in the laboratory to obtain the actual compaction degree.

[0027] The technical solution of the present invention has at least the following advantages and beneficial effects:

[0028] 1. This invention uses a cutting mechanism inserted into the ground to cut the soil. After cutting, the cut soil can be removed. By repeatedly cutting downwards at the same position, a sampling hole of a specified depth can be cut into the ground. Then, the sampling mechanism is inserted into the bottom wall of the sampling hole and reaches the specified depth to take a sample. Finally, the cutting mechanism and the sampling mechanism are removed from the sampling hole at the same time, and the sampling ring is removed from the drive rod to facilitate obtaining a sample at the required depth. It eliminates the need to excavate a pit in the ground in advance and have workers enter the pit to take samples, reducing the workload of excavation and backfilling pits and facilitating the sampling process.

[0029] 2. The present invention provides a fastening block at the bottom of the pressing block and fastening slots for inserting the fastening block on the first pressing block and the second pressing block. When the driving block is driven to move upward by the lifting component, the pressing block can drive the first pressing block or the second pressing block to move upward through the fastening block, thereby driving the cutting cylinder to carry out the cut sample, or causing the sampling ring to move upward to collide with the driving sleeve to shake off the residual soil on the driving sleeve. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0031] Figure 2 This is a schematic diagram of the cutting mechanism, sampling mechanism, driving mechanism, and supporting mechanism of the present invention;

[0032] Figure 3 This is a schematic diagram of the cutting mechanism, sampling mechanism, and pressing component of the present invention;

[0033] Figure 4 for Figure 3 Enlarged view of part A;

[0034] Figure 5 This is an exploded view of the cutting mechanism and sampling mechanism of the present invention;

[0035] Figure 6 for Figure 5 Enlarged view of part B;

[0036] Figure 7 This is a schematic diagram of the structure of the sealing member and the ejector member of the present invention inside the cutting cylinder;

[0037] Figure 8 This is a schematic diagram of the structure of the pressing mechanism, receiving groove, ejector and cutting cylinder of the present invention;

[0038] Figure 9 This is a schematic diagram of the pressing mechanism and the ejecting part of the present invention;

[0039] Figure 10 This is a schematic diagram of the sampling ring cutter and the support mechanism when the connector of the present invention is installed onto the mounting rod;

[0040] Reference numerals: 1-base, 11-roller, 12-notch, 2-cutting mechanism, 21-drive sleeve, 211-first limiting groove, 212-second limiting strip, 213-strip groove, 22-cutting cylinder, 23-first pressing member, 231-first connecting rod, 232-first pressing block, 24-sealing member, 241-annular step, 242-flexible fan-shaped piece, 25-push-out member, 251-push-out ring, 252-push-out rod, 253-push-out piece, 254-reset spring, 3-sampling mechanism, 31-drive rod, 311-first limiting strip, 32-sampling ring cutter, 33-second pressing member, 331-second connecting rod, 332-second pressing block, 34-connecting member, 341- Connecting collar, 342-arc connecting rod, 343-positioning bolt, 4-drive mechanism, 41-drive seat, 42-drive block, 43-lifting component, 44-pressure assembly, 441-pressure frame, 442-pressure block, 45-fastening block, 5-support mechanism, 51-column, 52-support seat, 53-rotating seat, 531-second limit groove, 54-rotating assembly, 55-mounting rod, 56-scraper frame, 561-scraper plate, 57-transverse electric cylinder, 6-electronic scale, 7-pressure mechanism, 71-support frame, 72-drive electric cylinder, 73-drive frame, 731-pressure rod, 732-arc pressure bar, 8-receiving groove, 81-fixed groove, 82-movable groove, 83-rodless cylinder. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0042] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0043] Example

[0044] The following is for reference Figures 1-10 As shown in the figure, and further illustrated with specific embodiments, this embodiment provides a roadbed compaction testing device for soft soil foundations. Figure 1 As shown, the system includes a base 1, a cutting mechanism 2, a sampling mechanism 3, a driving mechanism 4, a support mechanism 5, and an electronic scale 6. Rollers 11 are provided at each of the four corners of the base 1 to facilitate pushing it to the designated sampling position. A notch 12 is provided in the middle of the base 1, through which the cutting mechanism 2 and the sampling mechanism 3 reach the ground. The cutting mechanism 2 can be inserted into the ground to cut the soil. After cutting, the cut soil can be removed. By repeatedly cutting downwards at the same position, a sampling hole of a specified depth can be cut into the ground. The sampling mechanism 3 is used to insert into the bottom wall of the sampling hole and reach the specified depth for sampling. The driving mechanism 4 is used to drive the cutting mechanism 2 and the sampling mechanism 3 to move up and down. The support mechanism 5 provides support and guidance for the cutting mechanism 2 and the sampling mechanism 3. The electronic scale 6 is placed on the base 1 and used to weigh the sample taken out by the sampling mechanism 3 to facilitate subsequent calculation of the soil sample compaction.

[0045] Reference Figure 2 , Figure 3As shown, the cutting mechanism 2 includes a drive sleeve 21 and a cutting cylinder 22. The drive sleeve 21 is slidably disposed on the upper part of the notch 12 in a vertical direction. The cutting cylinder 22 is fixedly disposed on the bottom of the drive sleeve 21 and can extend into the notch 12. A first pressing member 23 is provided on both opposite sides of the top of the drive sleeve 21. The sampling mechanism 3 includes a drive rod 31 and a sampling ring knife 32. The drive rod 31 is slidably disposed in the drive sleeve 21. A connecting member 34 is provided on the top of the sampling ring knife 32 and is detachably installed on the bottom end of the drive rod 31 through the connecting member 34. The connecting member 34 is located below the drive sleeve 21. A second pressing member 33 is provided on both opposite sides of the top of the drive rod 31. The second pressing member 33 and the first pressing member 23 are distributed alternately in sequence. The first pressing member 23 is pressed by the driving mechanism 4, which enables the driving sleeve 21 to drive the cutting cylinder 22 to be inserted into the soil. After insertion into the soil, the driving sleeve 21 is rotated to cut the soil to the specified depth. Then, the first pressing member 23 is moved upward by the driving mechanism 4 to bring out the cut soil. After cutting the soil multiple times to form a sampling hole at the specified depth, the second pressing member 33 is moved to a position where it can be pressed by the driving mechanism 4 by rotating the driving sleeve 21 and the driving rod 31 at the same time by a specified angle. At this time, the second pressing member 33 is pressed by the driving mechanism 4 so as to drive the driving rod 31 to drive the sampling ring cutter 32 to be inserted into the bottom wall of the sampling hole so as to obtain the sample at the specified depth.

[0046] Reference Figure 2 , Figure 3As shown, the drive mechanism 4 includes a drive seat 41 vertically mounted on the base 1. The drive seat 41 contains a drive block 42 and a lifting member 43 for driving the drive block 42 to slide along the length of the drive seat 41. A pressing assembly 44 is mounted on the drive block 42. In this embodiment, the lifting member 43 is a motor screw assembly. In other embodiments, a cylinder or hydraulic cylinder can also be used as the lifting member 43, as long as it can drive the drive seat 41 to rise and fall vertically. The pressing assembly 44 includes a pressing frame 441 and two pressing blocks 442. The pressing frame 441 is welded to the drive block 42, and the two pressing blocks 442 are welded to the side of the pressing frame 441 away from the drive block 42. The first pressing member 23 includes a first connecting rod 231 and a first pressing block 232, and the second pressing member 33 includes a second connecting rod 331 and a second pressing block 332. In the initial state, the two pressing blocks 442 are aligned with the two first pressing blocks 232. When the lifting member 43 drives the driving block 42 to move downward, the pressing block 442 can press the first pressing block 232 to cause the driving sleeve 21 to drive the cutting cylinder 22 to insert into the ground, thereby drilling a sampling hole in the ground. When sampling is required by the sampling ring cutter 32, by simultaneously rotating the driving sleeve 21 and the driving rod 31 by a specified angle, the two second pressing blocks 332 can be positioned directly below the two pressing blocks 442. At this time, by driving the driving block 42 downward by the lifting member 43, the pressing block 442 can press the second pressing blocks 332 to drive the sampling ring cutter 32 into the sampling hole.

[0047] Reference Figure 3 , Figure 4 As shown, the bottom of the pressing block 442 is provided with a fastening block 45. Both the first pressing block 232 and the second pressing block 332 have fastening grooves on their sides near the fastening block 45 for the fastening block 45 to be inserted. The fastening block 45 is inverted T-shaped. When the bottom surface of the pressing block 442 is flush with the top surfaces of the first pressing block 232 and the second pressing block 332, by rotating the drive sleeve 21 and the drive rod 31 as a whole, when the fastening block 45 aligns with the fastening groove on the first pressing block 232 and is inserted, the relative position of the pressing block 442 and the first pressing block 232 is fixed. When the lifting member 43 drives the drive block 42 to move upward, the pressing block 442 can then drive the first pressing block 232 upward through the fastening block 45. The movement facilitates the cutting cylinder 22 to bring out the cut sample; when the fastening block 45 is aligned with the fastening groove on the second pressing block 332 and inserted, the relative position of the pressing block 442 and the second pressing block 332 is fixed. When the lifting member 43 drives the driving block 42 to move upward, the pressing block 442 can drive the second pressing block 332 to move upward through the fastening block 45, so as to facilitate the sampling ring to move upward to collide with the driving sleeve 21, thereby shaking off the residual soil on the driving sleeve 21.

[0048] Reference Figure 2As shown, the support mechanism 5 includes a column 51, which is vertically welded to the base 1. A support seat 52 is welded to the top of the column 51, and a rotating seat 53 is rotatably connected to the support seat 52. The drive sleeve 21 slides through the rotating seat 53. The support seat 52 is also provided with a rotating assembly 54 for driving the rotating seat 53 to rotate. The rotating assembly 54 drives the rotating seat 53 to rotate, thereby driving the drive sleeve 21 to rotate, which in turn drives the cutting cylinder 22 to rotate and cut the soil. In this embodiment, the rotating assembly 54 is a gear and ring assembly. The motor drives the gear to rotate, which in turn drives the ring to rotate, thereby causing the rotating seat 53 to drive the drive sleeve 21 to rotate. In other embodiments, a worm gear mechanism or a rack and pinion mechanism can also be used as the rotating assembly 54.

[0049] Reference Figure 5 , Figure 6 As shown, a first limiting strip 311 is provided on the drive rod 31 along its length direction, a first limiting groove 211 is provided inside the drive sleeve 21 for the first limiting strip 311 to slide, a second limiting strip 212 is provided on the outside of the drive sleeve 21 along its length direction, and a second limiting groove 531 is provided inside the rotating seat 53 for the second limiting strip 212 to slide. With the cooperation of the first limiting strip 311 and the first limiting groove 211, the drive rod 31 will not rotate relative to the drive sleeve 21. With the cooperation of the second limiting strip 212 and the second limiting groove 531, the drive sleeve 21 will not rotate relative to the rotating seat 53, thereby ensuring the consistency of the rotation process of the rotating seat 53, the drive sleeve 21, and the drive rod 31.

[0050] Reference Figure 5 As shown, the connector 34 includes a connecting collar 341 for sleeved on the drive rod 31. The connecting collar 341 is positioned above the sampling ring cutter 32 and is fixedly connected to the sampling ring cutter 32 via an arc-shaped connecting rod 342. The connecting collar 341 is provided with a positioning bolt 343, and the drive rod 31 has a threaded hole for the positioning bolt 343 to be inserted. During the pressing process of the drive sleeve 21, the bottom end of the drive sleeve 21 can abut against the connecting collar 341 and drive the drive rod 31 to move downward synchronously. When the connecting collar 341 abuts against the bottom end of the drive sleeve 21, the top surfaces of the first pressing block 232 and the second pressing block 332 are flush, and the sampling ring cutter 32 is located above the cutting cylinder 22. During the process of the cutting cylinder 22 being inserted into the soil to cut the soil, the sampling ring cutter 32 will not be inserted into the soil, thereby avoiding premature contact between the sampling ring cutter 32 and the soil and affecting the sampling results.

[0051] Reference Figure 6As shown, the top of the drive sleeve 21 has a strip groove 213 through which the second connecting rod 331 passes. When the second connecting rod 331 enters the strip groove 213, the sampling ring cutter 32 can be inserted into the cutting cylinder 22. When the pressing block 442 presses the second pressing block 332 to drive the sampling ring cutter 32 into the sampling hole, the second connecting rod 331 can enter the strip groove 213 without abutting against the drive sleeve 21, thereby preventing the sampling ring cutter 32 from driving the cutting cylinder 22 to continue moving downward and cutting the soil during sampling.

[0052] Reference Figure 5 , Figure 7 As shown, the cutting cylinder 22 is provided with a sealing member 24 and a pushing member 25. The sealing member 24 is used to prevent soil from entering the sampling ring cutter 32, and the pushing member 25 is used to push the cut soil out of the cutting cylinder 22. The sealing member 24 includes an annular step 241 and multiple flexible fan-shaped pieces 242. The annular step 241 is fixedly installed on the side wall of the cutting cylinder 22, and the multiple flexible fan-shaped pieces 242 are distributed in the annular step 241 and can seal the inner circle of the annular step 241. The cutting depth of the cutting cylinder 22 in each cut is less than the distance between the annular step 241 and the bottom of the cutting cylinder 22. When the cutting cylinder 22 is inserted into the soil, the flexible fan-shaped blade 242 can block the soil, preventing splashed soil from entering the sampling ring 32 and affecting subsequent sampling results. The ejector 25 includes an ejector ring 251 and two ejector rods 252. The ejector rods 252 are slidably mounted on the cutting cylinder 22, and the bottom end of the ejector rods 252 passes through the annular step 241. The ejector ring 251 is fixedly mounted at the end of the ejector rods 252 located outside the annular step 241. After the cutting cylinder 22 brings the cut soil away from the sampling hole, the ejector rods 252 drive the ejector ring 251 to press the soil, thus forcing the soil out from the bottom of the cutting cylinder 22.

[0053] Reference Figure 7 , Figure 8 As shown, a pressing mechanism 7 for driving the push rod 252 downward is provided on one side of the base 1. A receiving trough 8 for collecting soil is also provided on the base 1 at the opening of the notch 12. The receiving trough 8 includes a fixed trough 81 and a movable trough 82. The fixed trough 81 is fixed on the base 1, and the movable trough 82 is slidably disposed on the fixed trough 81 and can extend into the notch 12. A rodless cylinder 83 for driving the movable trough 82 is provided on one side of the fixed trough 81. When the cutting cylinder 22 moves upward to the designated position, the rodless cylinder 83 drives the movable trough 82 to move into the notch 12 and position it below the cutting cylinder 22. The pressing mechanism 7 drives the push rod 252 downward and presses the cut soil out from the bottom of the cutting cylinder 22. The receiving trough 8 can guide the soil to the outside of the base 1, and then it can continue to enter the sampling hole through the cutting cylinder 22 for cutting and drilling.

[0054] Reference Figure 8 , Figure 9 As shown, the pressing mechanism 7 includes a support frame 71, on which a drive cylinder 72 and a drive frame 73 are provided. The drive frame 73 includes a pressing rod 731 and arc-shaped pressing strips 732 provided at both ends of the pressing rod 731. A push-out plate 253 is provided at the top of the push-out rod 252. A return spring 254 is connected between the push-out plate 253 and the cutting cylinder 22. When the second pressing member 33 is located directly below the pressing assembly 44, the two arc-shaped pressing bars 732 are respectively located directly above the two push-out rods 252. The pressing bar 731 is driven to move closer to the push-out rod 252 by the driving electric cylinder 72. The arc-shaped pressing bar 732 can apply downward pressure to the push-out plate 253, thereby causing the push-out rod 252 to drive the push-out ring 251 to move and apply a pushing force to the soil in the cutting cylinder 22, thereby pushing the soil out of the cutting cylinder 22 and causing the soil to fall into the receiving trough 8. When the arc-shaped pressing bar 732 separates from the push-out plate 253, the push-out rod 252 moves back to the initial position under the action of the return spring 254, so as to facilitate the cutting cylinder 22 to continue to enter the soil for cutting the soil.

[0055] Reference Figure 2 , Figure 10 As shown, a mounting rod 55 for mounting the sampling ring cutter 32 is slidably provided on the side of the support base 52 away from the rotating base 53. The mounting rod 55 has threaded holes for the insertion of positioning bolts 343. After the sampling ring cutter 32 is removed from the drive rod 31, the connecting piece 34 is installed on the mounting rod 55 to facilitate the cleaning of excess soil on the upper and lower sides of the sampling ring cutter 32. A scraper frame 56 is provided on the column 51. Scraper plates 561 are provided on both the upper and lower sides of the scraper frame 56. The bottom surface of the upper scraper plate 561 is flush with the top surface of the sampling ring cutter 32, and the top surface of the lower scraper plate 561 is flush with the bottom surface of the sampling ring cutter 32. A transverse electric cylinder 57 is provided on the support base 52 to drive the mounting rod 55 to move closer to or away from the scraper frame 56. The mounting rod 55 is moved closer to the scraper frame 56 by the transverse electric cylinder 57. The scraper plates 561 on the upper and lower sides can simultaneously scrape off the excess soil at the top and bottom of the sampling ring cutter 32, so that the volume of the remaining part in the sampling ring cutter 32 is equal to the actual volume of the sampling ring cutter 32.

[0056] This embodiment also provides a detection method using the above-mentioned soft soil foundation roadbed compaction detection device, including the following steps:

[0057] S1. Push the base 1 to the sampling position, press the drive sleeve 21 through the pressing component 44 to drive the cutting cylinder 22 to insert into the ground, then drive the rotating seat 53 to rotate through the rotating component 54 to drive the cutting mechanism 2 to rotate as a whole, and then drive the cutting mechanism 2 to leave the ground through the driving mechanism 4 to remove the cut soil. Repeat the above steps, cut the ground to a specified depth each time and remove the cut soil until a sampling hole of a specified depth is cut.

[0058] S2. Insert the cutting mechanism 2 into the sampling hole again, and drive the rotating seat 53 to rotate through the rotating component 54, so that the second pressing member 33 at the top of the sampling rod is aligned with the pressing component 44 of the driving block 42, and press the sampling ring knife 32 through the pressing component 44 so that the sampling ring knife 32 enters the specified depth in the sampling hole.

[0059] S3. Drive the cutting mechanism 2 and sampling mechanism 3 out of the sampling hole through the driving mechanism 4. After they are removed, remove the connecting piece 34 on the sampling ring cutter 32 from the driving rod 31. Then remove the cut soil from the cutting cylinder 22 as a whole. At this time, the sampling ring cutter 32 is located in the cut soil.

[0060] S4. Clean the soil outside the sampling ring 32, then scrape the excess soil at the top and bottom of the sampling ring 32 to level it, and finally put the remaining soil inside the sampling ring 32 into the electronic scale 6 for weighing.

[0061] S5. Divide the mass obtained by weighing by the volume of the sampling ring 32 to obtain the wet density of the soil sample. Then calculate the dry density of the soil sample based on the moisture content and compare it with the maximum dry density measured in the laboratory to obtain the actual compaction degree.

[0062] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A device for testing the compaction degree of roadbed in soft soil foundations, characterized in that, include: The base (1) has rollers (11) at each of the four corners of its bottom and a notch (12) in the middle. The cutting mechanism (2) includes a drive sleeve (21) and a cutting cylinder (22). The drive sleeve (21) is slidably disposed on the upper part of the notch (12) in the vertical direction. The cutting cylinder (22) is fixedly disposed on the bottom of the drive sleeve (21) and can extend into the notch (12). The top of the drive sleeve (21) is provided with first pressing members (23) on both opposite sides. The sampling mechanism (3) includes a drive rod (31) and a sampling ring cutter (32). The drive rod (31) is slidably disposed in the drive sleeve (21). The sampling ring cutter (32) is detachably disposed at the bottom end of the drive rod (31) and located below the drive sleeve (21). A second pressing member (33) is provided on both sides opposite to the top of the drive rod (31). The second pressing member (33) and the first pressing member (23) are distributed alternately in sequence. The driving mechanism (4) includes a driving seat (41) vertically arranged on the base (1), a driving block (42) and a lifting member (43) for driving the driving block (42) to slide along the length direction of the driving seat (41) are provided in the driving seat (41), and a pressing component (44) is provided on the driving block (42). The support mechanism (5) includes a column (51), a support seat (52) is provided on the column (51), a rotating seat (53) is provided on the support seat (52), the drive rod (31) is slidably disposed in the rotating seat (53), and a rotating component (54) for driving the rotating seat (53) to rotate is also provided on the support seat (52). An electronic scale (6) is mounted on a base (1) and is capable of weighing samples; The drive rod (31) is provided with a first limiting strip (311) along its own length direction, the drive sleeve (21) is provided with a first limiting groove (211) for sliding of the first limiting strip (311), the drive sleeve (21) is provided with a second limiting strip (212) along its own length direction on the outside of the drive sleeve (21), and the rotating seat (53) is provided with a second limiting groove (531) for sliding of the second limiting strip (212). The pressing component (44) includes a pressing frame (441) and two pressing blocks (442). The pressing frame (441) is fixedly mounted on the driving block (42), and the two pressing blocks (442) are both located on the side of the pressing frame (441) away from the driving block (42). The first pressing member (23) includes a first connecting rod (231) and a first pressing block (232). The second pressing member (33) includes a second connecting rod (331) and a second pressing block (332). A fastening block (45) is provided at the bottom of the pressing block (442). The first pressing block (232) and the second pressing block (332) are both provided with a fastening groove for the fastening block (45) to be inserted on the side of the fastening block (45).

2. The subgrade compaction testing device for soft soil foundations according to claim 1, characterized in that, The top of the sampling ring cutter (32) is provided with a connector (34), the connector (34) includes a connecting collar (341) for being sleeved on the drive rod (31), the connecting collar (341) is located above the sampling ring cutter (32) and is fixedly connected to the sampling ring cutter (32) through an arc-shaped connecting rod (342), the connecting collar (341) is provided with a positioning bolt (343), the drive rod (31) is provided with a threaded hole for the positioning bolt (343) to be inserted, when the connecting collar (341) abuts against the bottom end of the drive sleeve (21), the top surfaces of the first pressing block (232) and the second pressing block (332) are flush, and the sampling ring cutter (32) is located above the cutting cylinder (22).

3. The subgrade compaction testing device for soft soil foundations according to claim 2, characterized in that, The top of the drive sleeve (21) is provided with a strip groove (213) through which the second connecting rod (331) passes. When the second connecting rod (331) enters the strip groove (213), the sampling ring knife (32) can be inserted into the cutting cylinder (22).

4. The subgrade compaction testing device for soft soil foundations according to claim 1, characterized in that, The cutting cylinder (22) is provided with a sealing member (24) and a push-out member (25). The sealing member (24) is used to prevent soil from entering the sampling ring cutter (32), and the push-out member (25) is used to push the cut soil out of the cutting cylinder (22). The sealing member (24) includes an annular step (241) and multiple flexible fan-shaped pieces (242). The annular step (241) is fixedly set on the side wall of the cutting cylinder (22), and the multiple flexible fan-shaped pieces... The pieces (242) are distributed within the annular step (241) and can seal the inner ring of the annular step (241); the push-out member (25) includes a push-out ring (251) and two push-out rods (252), the push-out rods (252) are slidably disposed on the cutting cylinder (22) and the bottom end of the push-out rods (252) passes through the annular step (241), and the push-out ring (251) is fixedly disposed at the end of the push-out rods (252) located outside the annular step (241).

5. The subgrade compaction testing device for soft soil foundations according to claim 4, characterized in that, The base (1) is provided with a pressing mechanism (7) on one side for driving the pressing rod (252) to move downward. The pressing mechanism (7) includes a support frame (71), on which a driving electric cylinder (72) and a driving frame (73) are provided. The driving frame (73) includes a pressing rod (731) and arc-shaped pressing strips (732) provided at both ends of the pressing rod (731).

6. The subgrade compaction testing device for soft soil foundations according to claim 5, characterized in that, The top of the push rod (252) is provided with a push plate (253), and a return spring (254) is connected between the push plate (253) and the cutting cylinder (22). When the second pressing member (33) is located directly below the pressing assembly (44), the two arc-shaped pressing strips (732) are respectively located directly above the two push rods (252).

7. The subgrade compaction testing device for soft soil foundations according to claim 1, characterized in that, It also includes a receiving groove (8), which includes a fixed groove (81) and a movable groove (82). The fixed groove (81) is fixed on the base (1), and the movable groove (82) is slidably disposed on the fixed groove (81) and can extend into the notch (12). A rodless cylinder (83) for driving the movable groove (82) to move is provided on one side of the fixed groove (81).

8. The subgrade compaction testing device for soft soil foundations according to claim 2, characterized in that, The support base (52) is slidably provided with an installation rod (55) for installing the sampling ring knife (32) on the side away from the rotating base (53). The installation rod (55) has a threaded hole for the positioning bolt (343) to be inserted. The column (51) is provided with a scraper frame (56). The upper and lower sides of the scraper frame (56) are provided with scraper plates (561). The bottom surface of the upper scraper plate (561) is flush with the top surface of the sampling ring knife (32), and the top surface of the lower scraper plate (561) is flush with the bottom surface of the sampling ring knife (32). The support base (52) is provided with a transverse electric cylinder (57) for driving the installation rod (55) to move closer to or away from the scraper frame (56).

9. A method for detecting the compaction degree of roadbed in soft soil foundation using the device described in any one of claims 1-8, characterized in that, Includes the following steps: S1. Push the base (1) to the sampling position, press the drive sleeve (21) with the pressing component (44) to drive the cutting cylinder (22) to insert into the ground, and then drive the rotating seat (53) to rotate with the rotating component (54) to drive the cutting mechanism (2) to rotate as a whole. Then drive the cutting mechanism (2) to leave the ground with the driving mechanism (4) to remove the cut soil. Repeat the above steps, cut the ground to a specified depth each time and remove the cut soil until a sampling hole of a specified depth is cut. S2. Insert the cutting mechanism (2) into the sampling hole again, and drive the rotating seat (53) to rotate through the rotating component (54) so ​​that the second pressing member (33) at the top of the sampling rod is aligned with the pressing component (44) of the driving block (42). The pressing component (44) presses the sampling ring knife (32) so that the sampling ring knife (32) enters the specified depth in the sampling hole. S3. Drive the cutting mechanism (2) and sampling mechanism (3) out of the sampling hole by the driving mechanism (4). After they are removed, remove the connector (34) on the sampling ring (32) from the driving rod (31). Then remove the cut soil from the cutting cylinder (22) as a whole. At this time, the sampling ring (32) is located in the cut soil. S4. Clean the soil outside the sampling ring (32), then scrape the excess soil at the top and bottom of the sampling ring (32) flat, and finally put the remaining soil inside the sampling ring (32) into the electronic scale (6) for weighing. S5. Divide the mass obtained by weighing by the volume of the sampling ring (32) to obtain the wet density of the soil sample. Then calculate the dry density of the soil sample based on the moisture content and compare it with the maximum dry density measured in the laboratory to obtain the actual compaction degree.

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