Method for detecting compactness of highway subgrade

Abstract

The invention discloses a highway subgrade compactness detection method, and belongs to the technical field of subgrade detection. The invention discloses a highway subgrade compactness detection method. The method comprises the following steps: S1, moving soil sampling equipment to a specified subgrade position; s2, drilling and soil sampling are conducted on the designated roadbed position through soil sampling equipment; s3, the soil taking equipment is moved out of the drilling position after drilling is completed, and the taken soil is automatically weighed; s4, then the substrate with the through holes is placed at the drilling positions, and the through holes of the substrate are aligned with the drilling positions; s5, the sand filling cylinder is placed in the middle of the base plate, and sand in the sand filling cylinder flows into the through hole through the opening in the bottom and finally falls into the drill hole till the sand in the sand filling cylinder does not flow downwards; by arranging the soil taking assembly, the regularity of a deep pit is ensured while pit digging and soil taking are performed, so that the detection precision is improved, meanwhile, workers can conveniently and automatically collect and weigh the dug soil, and the roadbed compaction detection efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of roadbed detection, and in particular to a method for detecting the compactness of a highway roadbed. Background Art

[0002] The compaction of highway subgrade and pavement is one of the important indicators to ensure road quality and safety. Insufficient compaction will lead to premature cracks and settlement on the pavement, affecting the service life of the road and driving safety. Compaction refers to the ratio of the maximum dry density of the material after compaction to the maximum dry density measured under laboratory conditions, which reflects the degree of compaction of the material. In order to ensure that the subgrade and pavement have good bearing capacity and durability, its compaction must be tested by scientific methods to ensure that the construction quality meets the design requirements.

[0003] During highway construction, it is often necessary to use the pit digging and sand filling method to test the compaction of the roadbed. Operators mostly use the pit digging and sand filling method to test the compaction of the roadbed. During the test, the tester usually manually digs a cylindrical pit with a depth of 15mm-20mm, and then fills the inside with sand for testing. However, manual digging is not only time-consuming and laborious, but also cannot guarantee the regularity of the pit, thus reducing the accuracy of the test. When testing the compaction of the roadbed, multiple measurements are generally required, and the soil samples taken from each pit need to be transferred and weighed one by one. The operation is cumbersome, which reduces the efficiency of the roadbed compaction test. Summary of the invention

[0004] The purpose of the present invention is to solve the problems existing in the prior art and to propose a method for detecting the compaction degree of a highway subgrade.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A method for detecting the compaction degree of a highway subgrade comprises the following steps: S1: Move the earth-moving equipment to the designated roadbed location; S2: Make the earth-taking equipment drill holes and take earth from the designated roadbed location; S3: After the soil extraction equipment has completed drilling, it moves out of the drilling position and automatically weighs the extracted soil; S4: Then, the substrate with the through hole is placed at the drilling position, so that the through hole of the substrate is aligned with the drilling position; S5: Place the sand filling cylinder in the middle of the base plate, so that the sand in the sand filling cylinder flows into the through hole through the opening at the bottom and finally falls into the drilled hole until the sand in the sand filling cylinder stops flowing down. The weight of the sand filling cylinder before and after the sand is released and the weight of the soil taken out are used to calculate the roadbed compaction degree using the roadbed compaction degree calculation formula.

[0006] Preferably, the soil-excavating equipment includes a U-shaped frame, an electric push rod is provided on the U-shaped frame, the movable end of the electric push rod is connected to a material shell, a soil-excavating assembly is fixedly provided in the middle of the material shell, a discharge plate is obliquely provided in the material shell, a discharge port is opened in the material shell at the bottom end of the discharge plate, a weighing device is provided at the bottom of the discharge port, and a connecting block is fixedly provided between the weighing device and the soil-excavating assembly.

[0007] Preferably, the soil taking assembly includes a soil taking pipe fixedly arranged in the middle of the material shell, a support fixedly arranged on the top of the soil taking pipe, a driving motor arranged on the support, a rotating shaft rotatably connected in the soil taking pipe and connected to the output shaft of the driving motor, and a spiral conveying sheet arranged on the outside of the rotating shaft, and a discharge port connected to the material shell is opened on the top of the soil taking pipe.

[0008] Preferably, a rotating rod is rotatably connected inside the material shell, a protrusion is provided on the rotating rod, the protrusion is movably abutted against the bottom of the unloading plate, the unloading plate is slidably connected inside the material shell, synchronous wheels are provided on the rotating rod and the rotating shaft, and a synchronous belt is provided between the two synchronous wheels.

[0009] Preferably, a weighing plate is provided on the top of the weighing device. The weighing plate is concave in the middle and high on all sides. The weighing plate is made of elastic rubber or metal material.

[0010] Preferably, a support plate is fixedly provided on the outer side of the material shell, and a swing rod is rotatably connected to the support plate through a pin shaft, a pull rope is arranged between the bottom of the swing rod and the top wall of the weighing plate, an arc groove is opened on the support plate, a slider connected to the swing rod is slidably connected in the arc groove, and an arc spring is arranged between the slider and the inner wall of the arc groove.

[0011] Preferably, a fixed seat is fixedly provided on the side wall of the U-shaped frame, a plurality of movable grooves are opened on the fixed seat, a movable block is slidably connected in each movable groove, an elastic element is arranged between the movable block and the inner wall of the movable groove, and an extrusion slope is opened on the top of one end of the movable block away from the elastic element.

[0012] Preferably, an air inlet valve and an air outlet valve connected to the arc groove are provided on the support plate, the arc groove is connected to an exhaust pipe through the air outlet valve, the end of the exhaust pipe away from the support plate is connected to a diffusion hopper, and the opening of the diffusion hopper faces the weighing plate.

[0013] Preferably, a material guide plate is fixedly provided on the outer wall of the soil taking pipe, and the end of the material guide plate away from the soil taking pipe passes through the U-shaped frame and extends outward, and the material guide plate is placed on the lower side of the weighing device.

[0014] Preferably, the bottom end of the U-shaped frame is rotatably connected to a pedal via a rotating shaft, a torsion spring for driving the pedal to return and rotate is provided on the rotating shaft, and the side surface of the pedal movably abuts against the bottom wall of the U-shaped frame.

[0015] Compared with the prior art, the present invention provides a method for detecting the compaction degree of a highway subgrade, which has the following beneficial effects: 1. The method for detecting the compaction of the highway subgrade ensures the regularity of the deep pit while digging the pit and taking the soil by setting up a soil taking component, thereby improving the accuracy of the detection. At the same time, it is convenient for the staff to automatically collect and weigh the excavated soil, thereby improving the efficiency of the subgrade compaction detection.

[0016] 2. This method for detecting the compaction of the highway subgrade drives the protrusion to intermittently move against the bottom wall of the material plate when the rotating rod rotates, so that the soil dropped from the material plate can be smoothly discharged from the material shell, avoiding the accumulation of soil in the material shell, resulting in a reduction in the weighing weight of the soil subsequently taken out, affecting the accuracy of the subgrade compaction detection result.

[0017] 3. The highway roadbed compaction detection method is as follows: when the swing rod moves upward, the upper side of the end portion abuts against the bottom wall of the movable block, and the swing rod is forced to swing around the pin shaft, so that the end of the swing rod away from the movable block is lifted. When the swing rod moves, the center of the weighing plate is pulled by the pull rope, so that the center of the weighing plate is lifted. The weighing plate is high in the middle and low around. The soil on the weighing plate that has been weighed is shaken and falls off, which is convenient for subsequent staff to use soil-taking equipment to directly dig pits at other locations for sampling and weighing. There is no need to manually move the sampled soil to the weighing equipment for weighing, and there is no need to manually move the sampled soil after weighing. The operation is simple and quick, which is convenient for improving the efficiency of roadbed compaction detection.

[0018] 4. This method for detecting the compaction of highway subgrade uses a swing rod to drive a slider to slide in an arc groove. The slider squeezes the air in the arc groove, and the air in the arc groove is blown to the surface of the weighing plate through an exhaust pipe and a diffusion bucket, so that no soil will remain on the surface of the weighing plate, avoiding an increase in the weighing weight of subsequent soil sampling, thereby ensuring the accuracy of the subgrade compaction detection result. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a schematic diagram of the cross-sectional structure of the present invention; Figure 3 For the present invention Figure 2 A partial enlarged structural diagram of the middle part; Figure 4 For the present invention Figure 2 A schematic diagram of the partially enlarged structure of the middle B part; Figure 5It is a schematic diagram of the cross-sectional structure of the support plate and the fixing seat of the present invention; Figure 6 For the present invention Figure 5 A schematic diagram of the partially enlarged structure of the middle C part; Figure 7 It is a schematic diagram of the structure of the pedal of the present invention when it is folded.

[0020] In the figure: 1. U-shaped frame; 2. electric push rod; 3. material shell; 301. discharge port; 4. discharge plate; 5. weighing device; 6. connecting block; 7. soil taking pipe; 701. support; 702. driving motor; 703. rotating shaft; 704. spiral conveyor; 705. discharge port; 8. rotating rod; 801. bump; 9. synchronous wheel; 10. weighing plate; 11. support plate; 111. swing rod; 112. pull rope; 12. arc groove; 121. slider; 122. arc spring; 13. fixed seat; 131. movable groove; 132. movable block; 133. elastic element; 134. exhaust pipe; 14. pedal; 15. guide plate. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making creative work are within the scope of protection of the present invention.

[0022] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0023] In the description of the present invention, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installed", "provided with", "mounted / connected", "connected", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two components; for ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] Example: Refer to Figure 1 and Figure 2 A method for detecting the compaction degree of a highway subgrade comprises the following steps: S1: Move the earth-moving equipment to the designated roadbed location; S2: Make the earth-taking equipment drill holes and take earth from the designated roadbed location; S3: After the soil extraction equipment has completed drilling, it moves out of the drilling position and automatically weighs the extracted soil; S4: Then, the substrate with the through hole is placed at the drilling position, so that the through hole of the substrate is aligned with the drilling position; S5: Place the sand filling cylinder in the middle of the base plate, so that the sand in the sand filling cylinder flows into the through hole through the opening at the bottom and finally falls into the drill hole until the sand in the sand filling cylinder stops flowing down. The weight of the sand filling cylinder before and after the sand is released and the weight of the soil taken out are used to calculate the roadbed compaction degree using the formula (both the base plate and the sand filling cylinder are existing technologies).

[0025] Reference Figure 1 , Figure 2 , Figure 3 and Figure 4 As a preferred technical solution of the present invention, the soil-taking equipment includes a U-shaped frame 1, on which an electric push rod 2 is arranged, and the movable end of the electric push rod 2 is connected to a material shell 3, a soil-taking assembly is fixedly arranged in the middle of the material shell 3, and a discharge plate 4 is obliquely arranged in the material shell 3. The material shell 3 is provided with a discharge port 301 at the bottom end of the discharge plate 4, and a weighing device 5 is arranged at the bottom of the discharge port 301, and a connecting block 6 is fixedly arranged between the weighing device 5 and the soil-taking assembly.

[0026] Furthermore, the soil taking assembly includes a soil taking pipe 7 fixedly mounted in the middle of the material shell 3, a support 701 fixedly mounted on the top of the soil taking pipe 7, a driving motor 702 arranged on the support 701, a rotating shaft 703 rotatably connected to the soil taking pipe 7 and connected to the output shaft of the driving motor 702, and a spiral conveying sheet 704 arranged on the outside of the rotating shaft 703. A discharge port 705 connected to the material shell 3 is provided at the top of the soil taking pipe 7.

[0027] Specifically, the soil-taking equipment is moved to the position where the pit is to be dug, the U-shaped frame 1 is lowered, and then the driving motor 702 and the electric push rod 2 are controlled to operate. The electric push rod 2 pushes the material shell 3 to move downward, so that the soil-taking pipe 7 connected to the material shell 3 is inserted into the soil. When the driving motor 702 is running, it drives the rotating shaft 703 to rotate, and the spiral conveying piece 704 on the outside of the rotating shaft 703 conveys the soil in the soil-taking pipe 7 upward, and the conveyed soil enters the material shell 3 from the discharge port 705 and is discharged from the discharge port 301 along the discharge plate 4. The setting of the material shell 3 can prevent the soil from flying around when digging the pit, and the soil discharged from the discharge port 301 falls on the weighing device 5 and is automatically weighed. By setting the soil-taking component, the regularity of the deep pit is guaranteed while digging the pit and taking the soil, thereby improving the accuracy of the detection, and at the same time, it is convenient for the staff to automatically collect and weigh the excavated soil, thereby improving the efficiency of roadbed compaction detection.

[0028] Reference Figure 1 , Figure 2 , Figure 3 and Figure 4 As a preferred technical solution of the present invention, a rotating rod 8 is rotatably connected in the material shell 3, and a protrusion 801 is arranged on the rotating rod 8. The protrusion 801 is movably abutted against the bottom of the unloading plate 4, and the unloading plate 4 is slidably connected in the material shell 3. Synchronous wheels 9 are arranged on the rotating rod 8 and the rotating shaft 703, and a synchronous belt is arranged between the two synchronous wheels 9.

[0029] Specifically, when the rotating shaft 703 rotates, the rotating rod 8 is driven to rotate through the synchronous wheel 9 and the synchronous belt. When the rotating rod 8 rotates, the protrusion 801 is driven to intermittently move against the bottom wall of the unloading plate 4, so that the soil dropped from the unloading plate 4 can be smoothly discharged from the material shell 3, avoiding the accumulation of soil in the material shell 3, resulting in a reduction in the weighing weight of the subsequent soil taken out, affecting the accuracy of the roadbed compaction test results.

[0030] Reference Figure 1 , Figure 2 , Figure 4 , Figure 5 and Figure 6 As a preferred technical solution of the present invention, a weighing plate 10 is arranged on the top of the weighing device 5. The weighing plate 10 is concave in the middle and high on all sides. The weighing plate 10 is made of elastic rubber or metal material.

[0031] Furthermore, a support plate 11 is fixedly provided on the outer side of the material shell 3, and a swing rod 111 is rotatably connected to the support plate 11 through a pin shaft, a pull rope 112 is arranged between the bottom of the swing rod 111 and the top wall of the weighing plate 10, an arc groove 12 is opened on the support plate 11, a slider 121 connected to the swing rod 111 is slidably connected in the arc groove 12, and an arc spring 122 is arranged between the slider 121 and the inner wall of the arc groove 12.

[0032] Furthermore, a fixed seat 13 is fixedly provided on the side wall of the U-shaped frame 1, and a plurality of movable grooves 131 are opened on the fixed seat 13. A movable block 132 is slidably connected in each movable groove 131. An elastic element 133 is arranged between the movable block 132 and the inner wall of the movable groove 131. An extrusion slope is opened on the top of one end of the movable block 132 away from the elastic element 133.

[0033] Specifically, when the electric push rod 2 pushes the material shell 3 to move downward, the support plate 11 outside the material shell 3 drives the swing rod 111 to move downward. When the swing rod 111 moves downward, a thrust is applied to the extrusion slope of the movable block 132. The movable block 132 is forced to shrink into the movable groove 131 to avoid the downward movement of the swing rod 111. When the soil excavation equipment moves out of the drilling position after drilling, the material shell 3 drives the swing rod 111 to move upward through the support plate 11. When the swing rod 111 moves upward, the upper side of the end portion abuts against the bottom wall of the movable block 132. The swing rod 111 is forced to swing around the pin shaft, so that the swing rod 111 The end away from the movable block 132 is lifted, and when the swing rod 111 moves, it pulls the center part of the weighing plate 10 through the pull rope 112, so that the center part of the weighing plate 10 is lifted. The weighing plate 10 is in a shape that is high in the middle and low around. The soil on the weighing plate 10 that has been weighed is shaken and falls off, which is convenient for subsequent staff to use soil-taking equipment to directly dig pits at other locations for sampling and weighing. There is no need to manually move the sampled soil to the weighing equipment 10 for weighing, and the sampled soil is manually moved away after the weighing is completed. The operation is simple and quick, which is convenient for improving the efficiency of roadbed compaction detection.

[0034] Reference Figure 1 , Figure 2 , Figure 4 , Figure 5 and Figure 6 As a preferred technical solution of the present invention, an air inlet valve and an air outlet valve connected to the arc groove 12 are provided on the support plate 11. The arc groove 12 is connected to an exhaust pipe 134 through the air outlet valve. The end of the exhaust pipe 134 away from the support plate 11 is connected to a diffusion hopper, and the opening of the diffusion hopper faces the weighing plate 10.

[0035] Specifically, when the swing arm 111 moves relative to the support plate 11, the swing arm 111 drives the slider 121 to slide in the arc groove 12, and the slider 121 squeezes the air in the arc groove 12. The air in the arc groove 12 is blown toward the surface of the weighing plate 10 through the exhaust pipe 134 and the diffusion bucket, so that no soil will remain on the surface of the weighing plate 10, thereby avoiding the increase in the weighing weight of the subsequent sampled soil and affecting the accuracy of the roadbed compaction test results.

[0036] Reference Figure 1 and Figure 2 As a preferred technical solution of the present invention, a guide plate 15 is fixedly provided on the outer wall of the soil taking pipe 7. The end of the guide plate 15 away from the soil taking pipe 7 passes through the U-shaped frame 1 and extends outward. The guide plate 15 is placed on the lower side of the weighing device 5.

[0037] Specifically, by setting a guide plate 15 at the bottom of the weighing device 5, on the one hand, it can prevent the soil shaken off by the weighing plate 10 from accumulating beside the drilling position and affecting the placement of the subsequent substrate. On the other hand, it is convenient to collect the soil shaken off by the weighing plate 10 and reduce the workload of the staff.

[0038] Reference Figure 1 , Figure 2 and Figure 7 As a preferred technical solution of the present invention, the bottom end of the U-shaped frame 1 is rotatably connected to a pedal 14 via a rotating shaft, and a torsion spring is provided on the rotating shaft for driving the pedal 14 to reset and rotate, and the side surface of the pedal 14 is movably against the bottom wall of the U-shaped frame 1.

[0039] Specifically, by arranging a pedal 14 at the bottom of the U-shaped frame 1, the workers can step on the pedal 14 with both feet when digging a hole to take soil, thereby ensuring the stability of the soil taking process. When not in use, the pedal 14 automatically flips and folds, reducing the space occupied by the soil taking equipment and facilitating transportation and storage.

[0040] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A method for detecting the compaction degree of a highway subgrade, characterized in that: The following steps are involved: S1: Move the earth-moving equipment to the designated roadbed location; S2: Make the earth-taking equipment drill holes and take earth from the designated roadbed location; S3: After the soil extraction equipment has completed drilling, it moves out of the drilling position and automatically weighs the extracted soil; S4: Then, the substrate with the through hole is placed at the drilling position, so that the through hole of the substrate is aligned with the drilling position; S5: Place the sand filling cylinder in the middle of the base plate, so that the sand in the sand filling cylinder flows into the through hole through the opening at the bottom and finally falls into the drilled hole until the sand in the sand filling cylinder stops flowing down. The weight of the sand filling cylinder before and after the sand is released and the weight of the soil taken out are used to calculate the roadbed compaction degree using the roadbed compaction degree calculation formula.

2. A method for detecting compaction of a highway subgrade according to claim 1, characterized in that: The soil-taking device comprises a U-shaped frame (1), an electric push rod (2) is arranged on the U-shaped frame (1), the movable end of the electric push rod (2) is connected to a material shell (3), a soil-taking assembly is fixedly arranged in the middle of the material shell (3), a material discharge plate (4) is obliquely arranged in the material shell (3), a material discharge port (301) is opened at the bottom end of the material discharge plate (4) in the material shell (3), a weighing device (5) is arranged at the bottom of the material discharge port (301), and a connecting block (6) is fixedly arranged between the weighing device (5) and the soil-taking assembly.

3. A method for detecting compaction of a highway subgrade according to claim 2, characterized in that: The soil taking assembly comprises a soil taking pipe (7) fixedly arranged in the middle of the material shell (3), a support (701) fixedly arranged on the top of the soil taking pipe (7), a driving motor (702) arranged on the support (701), a rotating shaft (703) rotatably connected in the soil taking pipe (7) and connected to the output shaft of the driving motor (702), and a spiral conveying sheet (704) arranged outside the rotating shaft (703); a discharge port (705) communicating with the material shell (3) is provided at the top of the soil taking pipe (7).

4. A method for detecting compaction of a highway subgrade according to claim 3, characterized in that: A rotating rod (8) is rotatably connected in the material shell (3), a convex block (801) is provided on the rotating rod (8), the convex block (801) is movably abutted against the bottom of the unloading plate (4), the unloading plate (4) is slidably connected in the material shell (3), the rotating rod (8) and the rotating shaft (703) are both provided with synchronous wheels (9), and a synchronous belt is provided between the two synchronous wheels (9).

5. A method for detecting compaction of a highway subgrade according to claim 3, characterized in that: A weighing plate (10) is arranged on the top of the weighing device (5); the weighing plate (10) is concave in the middle and high on all sides; the weighing plate (10) is made of elastic rubber or metal material.

6. A method for detecting compaction of a highway subgrade according to claim 5, characterized in that: A support plate (11) is fixedly provided on the outer side of the material shell (3), a swing rod (111) is rotatably connected to the support plate (11) via a pin shaft, a pull rope (112) is provided between the bottom of the swing rod (111) and the top wall of the weighing plate (10), an arc groove (12) is provided on the support plate (11), a slider (121) connected to the swing rod (111) is slidably connected in the arc groove (12), and an arc spring (122) is provided between the slider (121) and the inner wall of the arc groove (12).

7. A method for detecting compaction of a highway subgrade according to claim 6, characterized in that: A fixed seat (13) is fixedly provided on the side wall of the U-shaped frame (1), and a plurality of movable grooves (131) are provided on the fixed seat (13), and a movable block (132) is slidably connected in each movable groove (131), and an elastic element (133) is provided between the movable block (132) and the inner wall of the movable groove (131), and an extrusion inclined surface is provided on the top of one end of the movable block (132) away from the elastic element (133).

8. A method for detecting compaction of a highway subgrade according to claim 7, characterized in that: An air inlet valve and an air outlet valve in communication with the arc-shaped groove (12) are provided on the support plate (11); the arc-shaped groove (12) is connected to an exhaust pipe (134) via the exhaust valve; an end of the exhaust pipe (134) away from the support plate (11) is connected to a diffusion hopper; the opening of the diffusion hopper faces the weighing plate (10).

9. A method for detecting compaction of a highway subgrade according to claim 3, characterized in that: A material guide plate (15) is fixedly provided on the outer wall of the soil taking pipe (7), and one end of the material guide plate (15) away from the soil taking pipe (7) passes through the U-shaped frame (1) and extends outwards, and the material guide plate (15) is placed on the lower side of the weighing device (5).

10. A method for detecting compaction of a highway subgrade according to claim 3, characterized in that: The bottom end of the U-shaped frame (1) is rotatably connected to a pedal (14) via a rotating shaft, and a torsion spring for driving the pedal (14) to return and rotate is provided on the rotating shaft, and the side surface of the pedal (14) movably abuts against the bottom wall of the U-shaped frame (1).

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