NL2036750A - Subgrade compactness detection device - Google Patents
Subgrade compactness detection device Download PDFInfo
- Publication number
- NL2036750A NL2036750A NL2036750A NL2036750A NL2036750A NL 2036750 A NL2036750 A NL 2036750A NL 2036750 A NL2036750 A NL 2036750A NL 2036750 A NL2036750 A NL 2036750A NL 2036750 A NL2036750 A NL 2036750A
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- NL
- Netherlands
- Prior art keywords
- compaction
- plate
- measuring
- degree
- column
- Prior art date
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- 238000001514 detection method Methods 0.000 title abstract description 12
- 238000005056 compaction Methods 0.000 claims abstract description 61
- 230000007246 mechanism Effects 0.000 claims abstract description 28
- 238000012360 testing method Methods 0.000 claims abstract description 18
- 239000000725 suspension Substances 0.000 claims description 8
- 230000003287 optical effect Effects 0.000 claims description 7
- 238000004804 winding Methods 0.000 claims description 7
- 238000006073 displacement reaction Methods 0.000 abstract description 8
- 238000005259 measurement Methods 0.000 abstract description 6
- 238000006243 chemical reaction Methods 0.000 abstract description 3
- 238000010276 construction Methods 0.000 abstract description 3
- 239000002344 surface layer Substances 0.000 abstract description 3
- 238000013461 design Methods 0.000 abstract description 2
- 230000009467 reduction Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 230000008859 change Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000007689 inspection Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D1/00—Investigation of foundation soil in situ
- E02D1/08—Investigation of foundation soil in situ after finishing the foundation structure
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Soil Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
of the invention The invention belongs to the field of road construction, in particular to a subgrade compactness detection device, which comprises a base placed on the subgrade surface to be detected, a compaction mechanism comprises a test slot arranged on the base, and a 5 compaction plate is placed in the test slot; through the work of pulley mechanism, the hammer mechanism is controlled to fall downward or rise upward, and the impact force of the striking plate piece is balanced on the compaction plate through the auxiliary guidance of the column and the reduction of contact friction; after receiving the feedback of force, the tester installed on the striking plate piece carries out numerical conversion of compactness 10 data, repeats the above steps for multiple measurements, and takes the average value of multiple data as the final data of compactness detection, thus solving the problem that manual measurement is prone to errors; the design of the calibration mechanism can analyze the distance of the compaction plate sinking into the subgrade surface layer under a single impact by changing the position of the high point of the calibration piece in the front 15 and back photos, and provide displacement reference data except the force feedback data of the tester.
Description
Yan’an University (CN) 23/115 NL
Subgrade compactness detection device
The invention relates to the field of road construction, in particular to a subgrade compactness detection device.
Background Technology
Subgrade compactness is one of the key indicators of subgrade and pavement construction quality inspection, which indicates the density status after site compaction. The higher the compactness, the higher the density, and the better the overall performance of the material. Traditional inspection usually adopts ring knife methad, sand filling method and nuclear densitometer method, etc., which needs to sample the subgrade, thus causing site damage, which has great limitations. The new frequency spectrum type subgrade compactness rapid tester is a testing instrument that uses the impact of a falling hammer to make the soil rebound, and uses the low frequency to measure the response value of the soil to get the subgrade compactness, and it has little damage to the subgrade in the detection area.
The prior art has the following problems: 1. When testing the subgrade compactness by using the frequency spectrum type subgrade compactness rapid tester, it is necessary to keep the balance of the impact force of the striking plate piece on the compaction plate every time, and the number of times of striking is not less than three times. Most of the existing striking devices manually drop the striking plate piece, and there are hidden dangers in the falling force and falling direction, which leads to a large error in the detected data and affects the judgment of the workers on the compactness. 2. When the striking plate piece impacts the compaction plate, it will press down at the subgrade. In the subsequent inspection, the impact force of the contact of the compaction plate is unbalanced due to the increase of the falling distance of the striking plate piece, and the measured data has a large error, which affects the judgment of the staff on the compactness.
Description of the Invention (1) Objective of the invention
In order to solve the technical problems existing in the background technology, the invention provides a subgrade compactness detection device, which assists in guiding during the falling and hammering action of the striking plate piece, ensures the single-point hammering to improve the accuracy of detection data, and the setting of the calibration mechanism can obtain the displacement distance of the compaction plate to obtain the reference amount of compactness, and assists in controlling the falling distance of the striking plate piece to ensure the balance of compaction impact force, and has the characteristics of convenient use and accurate measurement. (2) Technical scheme
In order to solve the above technical problems, the invention provides a subgrade compactness detection device, which comprises a base placed on the subgrade surface to be detected, a compaction mechanism comprising a test slot arranged on the base, and a compaction plate is placed in the test slot;
A through column is arranged above the test slot, and a guide table is arranged at the corner of the column; the inner wall of the guide table is provided with a chute; the side edge of the chute is formed with a flange strip;
The pulley mechanism comprises a suspension arranged above the column; the lower part of the suspension is provided with a fixed pulley; the lower part of the fixed pulley is provided with a protruding rope hook, and a movable pulley is arranged below; the bottom of the fixed pulley is provided with a hanger, and one side of the movable pulley is provided with a wheel disc spindle bracket mounted on the base; a winding wheel disc is arranged in the wheel disc spindle bracket, and a rope shaft penetrates between the two; one end of the rope shaft is connected to the output end of the driving device, and the outer wall is coiled with ropes passing through the fixed pulley and the movable pulley in turn;
A hammer mechanism comprises a hanging plate installed at the bottom of the hanger, and a striking plate piece is installed below the hanging plate; the top of the striking plate piece is provided with a tester, and the corner of the hanging plate is provided with a protruding bearing frame; a rotatable bearing is installed in the bearing frame.
Preferably, the striking plate piece, the column and the compaction plate are arranged in parallel, and each structure is centrally symmetrical.
Preferably, the edge of the bearing is attached to the clamping surfaces of the chute and the flange strip, and the bearing slides relative to the chute.
Preferably, the end of the rope far from the rope shaft is fixed on the rope hook.
Preferably, the movable pulley rises or falls synchronously with the winding and unwinding of the rope, and the falling distance of the movable pulley relative to the fixed pulley is an impact distance.
Preferably, the side wall of the column is provided with a notch, and the specification of the notch is greater than that of the compaction plate.
Preferably, the compaction mechanism further comprises a calibration support formed at the edge of the compaction plate, and a calibration piece for assisting calibration is formed at the top of the calibration support.
Preferably, the calibration mechanism comprises a distance adjusting track arranged onthe base, and a sliding piece is slidably installed in the distance adjusting track; the top of the sliding piece is provided with a high-speed camera; an optical lens is formed on the end face of the high-speed camera facing the notch of the column.
Preferably, the two sides of the high-speed camera are symmetrically provided with protruding stoppers, and the high-speed camera and the movable end face of the distance- adjusting rail are locked by the stoppers.
Preferably, the terminal equipment wirelessly connected with the high-speed camera is in communication connection with the driving device.
The technical scheme of the invention has the following beneficial technical effects. 1. Through the work of pulley mechanism, the hammer mechanism is controlled to fall downward or rise upward, and the impact force of the striking plate piece is balanced on the compaction plate through the auxiliary guidance of the column and the reduction of contact friction; after receiving the feedback of force, the tester installed on the striking plate piece carries out numerical conversion of compactness data, repeats the above steps for multiple measurements, and takes the average value of multiple data as the final data of compactness detection, thus solving the problem that manual measurement is prone to errors. 2. The design of the calibration mechanism can analyze the distance of the compaction plate sinking into the subgrade surface layer under a single impact by changing the position of the high point of the calibration piece in the front and back photos, and provide displacement reference data except the force feedback data of the tester. 3. According to the change of displacement reference data, send an instruction to the driving device to unwind the rope, so that the striking plate piece under the hanger and the compaction plate have the same impact time interval each time, ensure that the impact force of the striking plate piece is constant, prevent the impact distance change caused by the subsidence of the compaction plate from affecting the impact force, and keep the data measured by the tester accurate.
Fig. 1 is a schematic structural diagram of the present invention;
Fig. 2 is a partial structural diagram of the present invention;
Fig. 3 is a schematic diagram of the matching structure of the compaction mechanism and the column of the present invention;
Fig. 4 is a schematic diagram of the separation structure of the compaction plate and the base of the present invention;
Fig. 5 is a schematic diagram of the separation structure of the calibration mechanism of the present invention;
Fig. 8 is a schematic diagram of the implementation of the present invention.
Reference numerals: 1. base; 2. column; 21. guide table; 22. chute; 23. flange strip; 31. test slot; 32. compaction plate; 33. calibration support; 34. calibration piece; 41. suspension; 42. fixed pulley, 43. rope hook; 44. movable pulley; 45. hanger; 46. rope; 47. wheel disc spindle bracket; 48. winding wheel disc; 49. driving device; 51. hanging plate; 52. tester; 53. striking plate piece; 54. bearing frame; 55. bearing; 61. distance-adjusting rail; 62. sliding piece; 63. stopper; 64. high-speed camera; 65. optical lens.
Specific Implementation Methods
In order to make the objective, technical scheme and advantages of the present invention more clear, the present invention will be further described in detail with reference to specific embodiments and figures. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the invention. In addition, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessarily confusing the concepts of the present invention.
Embodiment 1
As shown in Figs. 1-6, the subgrade compactness detection device provided by the invention comprises a base 1 placed on the subgrade surface to be detected, and a compaction mechanism comprises a test slot 31 arranged on the base 1; a compaction plate 32 is placed inside the test slot 31.
A through column 2 is arranged above the test slot 31, and a guide table 21 is arranged at the corner of the column 2; the inner wall of the guide table 21 is provided with a chute 22; the side edge of the chute 22 is formed with a raised flange strip 23.
The pulley mechanism comprises a suspension 41 arranged above the column 2; a fixed pulley 42 is installed at the lower part of the suspension 41, a protruding rope hook 43 is installed at the lower part of the fixed pulley 42, and a movable pulley 44 is arranged below; a hanger 45 is installed at the bottom of the fixed pulley 42; one side of the movable pulley 44 is provided with a wheel disc spindle bracket 47 installed on the base 1, and a winding wheel disc 48 is installed in the wheel disc spindle bracket 47, with a rope shaft passing between them; one end of the rope shaft is connected to the output end of the driving device 49, and the outer wall is coiled with a rope 46 which passes through the fixed pulley 42 and the movable pulley 44 in turn; one end of the rope 46 far away from the rope shaft is fixed on the rope hook 43.
The hammer mechanism comprises a hanging plate 51 installed at the bottom of the 5 hanger 45, and a striking plate piece 53 is installed below the hanging plate 51; a tester 52 is arranged at the top of the striking plate piece 53, and a protruding bearing frame 54 is arranged at the corner of the hanging plate 51; a rotatable bearing 55 is installed in the bearing frame 54.
It should be noted that the striking plate piece 53, the column 2 and the compaction plate 32 are arranged in parallel. The striking plate piece 53 slides downward along the inner cavity of the column 2, and the falling striking plate piece 53 impacts downward on the surface of the compaction plate 32. Because the structures are centrally symmetrical, the forces at each contact point are balanced.
In this embodiment, the hammer mechanism is controlled to fall down or rise up through the operation of the pulley mechanism. The following falling process is taken as an example: the rope 48 coiled on the rope shaft in the winding wheel disc 48 is loosened, and the movable pulley 44 moves to the end far away from the fixed pulley 42 under the action of the rope 46. The hammer mechanism connected with the hanger 45 on the movable pulley 44 begins to fall, and the specifications of the hanging plate 51 and the top opening of the column 2 match, and when falling, it enters the inner cavity of the column 2, and at this time, the bearing 55 installed on the bearing frame 54 at the corner of the hanging plate 51 enters the guide table 21; the edge of the bearing 55 is attached to the clamping surfaces of the chute 22 and the flange strip 23, and the bearing 55 rotates along the bearing frame 54 while sliding relative to the chute 22 during contact with the chute 22. In the process of falling, the friction force at the contact position between the hanging plate 51 and the column 2 is dispersed by the rotation of the bearing 55, so that the striking plate piece 53 in the bottom keeps a constant impact force to impact the compaction plate 32; the compaction plate 32 drops down to subgrade test layer along test slot 31, and tester 52 installed on striking plate piece 53 receives force feedback and performs numerical conversion of compaction data.
The above steps are repeated for multiple measurements, and the average value of multiple data is taken as the final data of compactness detection.
As shown in Figs. 1-2, the movable pulley 44 rises or falls synchronously with the winding and unwinding of the rope 46, and the falling distance of the movable pulley 44 relative to the fixed pulley 42 is the impact distance. When the fixed pulleys and movable pulleys are assembled into a pulley block for use, the number of strands of rope 46 bypassing the movable pulley 44 can be increased, so that the resistance can be shared on more strands of rope 46, thus achieving the objective of saving labor, and the lifting of the striking plate piece 53 is convenient in the labor-saving state. It should be noted that when the movable pulley 44 falls, it is not affected by the fixed pulley 42, so that the striking plate piece 53 can impact the compaction plate 32 at a constant distance.
As an example of the installation of the compaction plate 32 in the test slot 31, the side wall of the column 2 is provided with a notch, and the specification of the notch is larger than that of the compaction plate 32; the compaction plate 32 is placed in the test slot 31 at the contact position between the bottom of the column 2 and the base 1 along the notch of the column 2, and the auxiliary compaction plate 32 is in contact with the subgrade surface.
Embodiment 2
As shown in Figs. 3-6, the compaction mechanism also includes a calibration support 33 formed at the edge of the compaction plate 32, and a calibration piece 34 for assisting calibration is formed at the top of the calibration support 33.
The calibration mechanism comprises a distance-adjusting rail 61 arrange on the base 1, a sliding piece 62 is slidably installed in the distance-adjusting rail 81, a high-speed camera 64 is installed at the top of the sliding piece 62, and an optical lens 65 is formed on the end face of the high-speed camera 84 facing the notch of the column 2.
In another embodiment, the calibration support 33 at the edge of the compaction plate 32 is equipped with a calibration piece 34 for shooting and tracking by a high-speed camera 64. Because the optical lens 65 of the high-speed camera 64 can shoot the height change of the calibration piece 34 on the compaction plate 32 before and after the impact through the gap of the column 2, the distance of the compaction plate 32 sinking into the subgrade surface layer under a single impact can be analyzed by the high point position of the calibration piece 34 in the photos before and after, providing displacement reference data except the force feedback data of the tester 52.
In an alternative embodiment, the terminal equipment wirelessly connected to the high-speed camera 64 is in communication connection with the driving device 49; the reference data of the forward and backward displacement of the calibration piece 34 on the compaction plate 32 photographed by the high-speed camera 64 is obtained through the comparison of the terminal equipment, and the obtained displacement difference is transmitted to the controller of the driving device 49; the controller sends an instruction to the driving device 49 to unwind the rope 46, so that the distance between the striking plate piece 53 under the hanger 45 and the compaction plate 32 is always the same, so as to ensure that the impact force of the striking plate piece 53 is constant, prevent the impact distance from changing and affect the impact force due to the subsidence of the compaction plate 32 before and after, and keep the data measured by the tester 52 accurate.
It should be noted that the high-speed camera 64 is movably installed on the base 1, and can be slidably installed along the distance-adjusting rail 61, and is close to or far away from the notched part of the column 2, so that when the included angle between the optical lens 65 and the calibration piece 34 is about 30°, the average error in the "in-plane before and after taking photos" is the smallest, and The feedback difference between the distance before and after the compaction plate 32 sinks into the subgrade is the most accurate. Before each impact on the compaction plate 32, the included angle between the optical lens 65 and the calibration piece 34 is adjusted to be within the range of about 30° to ensure the accuracy of the displacement reference data.
In order to facilitate the positioning of the high-speed camera 64 after sliding, further, protruding stoppers 63 are symmetrically installed on both sides of the high-speed camera 64, and the high-speed camera 84 and the movable end face of the distance-adjusting rail 61 are locked by the stoppers 63.
Among them, the stopper 63 in the application is of a magnetic attraction structure, and the stopper 63 is adsorbed on the upper wall of the distance-adjusting rail 61, so that the position of the high-speed camera 64 can be limited without additional bolt structure, plug-in structure and fixing structure.
It should be understood that the above-mentioned specific embodiments of the present invention are only used to illustrate or explain the principles of the present invention, and do not constitute limitations of the present invention. Therefore, any modification, equivalent substitution, improvement, etc. made without departing from the spirit and scope of the invention should be included in the protection scope of the invention. Furthermore, that append claims of the present invention are intend to cover all changes and modifications that come within the scope and boundary of the appended claims, or the equivalents of such scope and boundaries.
Claims (10)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202310206451.XA CN116201093A (en) | 2023-03-06 | 2023-03-06 | Roadbed compactness check out test set |
Publications (1)
Publication Number | Publication Date |
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NL2036750A true NL2036750A (en) | 2024-02-27 |
Family
ID=86519002
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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NL2036750A NL2036750A (en) | 2023-03-06 | 2024-01-04 | Subgrade compactness detection device |
Country Status (2)
Country | Link |
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CN (1) | CN116201093A (en) |
NL (1) | NL2036750A (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN116397614B (en) * | 2023-06-08 | 2023-08-29 | 中国水利水电第七工程局有限公司 | Automatic location compactness nondestructive test car |
CN116793864B (en) * | 2023-06-27 | 2024-04-02 | 郑晓明 | Roadbed compactness detection method for road detection |
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2023
- 2023-03-06 CN CN202310206451.XA patent/CN116201093A/en active Pending
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- 2024-01-04 NL NL2036750A patent/NL2036750A/en unknown
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