A subgrade compactness detection device based on the pit filling and sand replacement method

Abstract

This application relates to a subgrade compaction degree detection device based on the pit filling and sand replacement method, which includes a frame. An installation frame is slidably arranged on the frame in the vertical direction. A measuring cylinder is fixedly arranged on the installation frame, and the axis of the measuring cylinder is vertical. A first driving member for driving the installation frame to slide is arranged on the frame. A drilling cylinder is coaxially rotatably arranged on the bottom wall of the measuring cylinder. The diameters of the measuring cylinder and the drilling cylinder are both adapted to the diameter of the sand-containing cylinder. A sawtooth is arranged at one end of the drilling cylinder away from the measuring cylinder. A rotating shaft is rotatably arranged in the measuring cylinder, and the rotating shaft is coaxially fixedly connected with the drilling cylinder. A soil loosening member for crushing the sandy soil entering the drilling cylinder is arranged on the rotating shaft. A driving source for driving the rotating shaft to rotate is arranged on the installation frame. This application has the effects of improving the accuracy of the compaction degree detection data, reducing the labor intensity of the staff, and improving the efficiency of the compaction degree detection.

Description

Technical Field

[0001] This application relates to the technical field of compaction degree detection, and particularly to a subgrade compaction degree detection device based on the method of digging pits and filling with sand. Background Technique

[0002] At present, the construction and development of expressways in China are advancing by leaps and bounds. In 2017 alone, 5,000 kilometers of new expressways were built, and 200,000 kilometers of rural roads were newly rebuilt or renovated. The total mileage of opened roads has reached 1,295,000 kilometers. After that, the scale of expressways in China will be further expanded. However, due to quality problems, early damage to some of these roads occurs from time to time, and the unqualified compaction degree is one of the main reasons. The compaction degree is closely related to the bearing capacity of the subgrade. Usually, when the compaction degree is improved, the basic bearing capacity can also be correspondingly improved. Especially for asphalt concrete roads, when the compaction degree is increased by 1%, the corresponding bearing capacity can be increased by about 10% - 15%. Therefore, during highway construction operations, it is necessary to strictly control the compaction quality to ensure the service life of the highway.

[0003] At present, when detecting the subgrade compaction degree, the method of digging pits and filling with sand is usually adopted. When measuring the compaction degree by the method of digging pits and filling with sand, first calculate the density of the standard sand, select the detection site, dig a cylindrical test pit with a depth of 15 cm - 40 cm at the detection site according to the size of the sand-containing cylinder, take out the sample in the test pit, and measure the moisture content of the sample. Fill the sand-containing cylinder with sand and close the valve, weigh the total mass of the sand-containing cylinder and the sand. Place the sand-containing cylinder on the dug test pit, open the valve, and let the standard sand inject into the test pit. When the test pit is filled with the standard sand, close the valve, weigh the total mass of the sand-containing cylinder and the remaining sand, and calculate the mass of the standard sand used to fill the test pit. Then repeat the above steps three times, and take the average value of the three detection data to calculate the density of the sample.

[0004] At present, when digging the test pit, workers need to use tools such as chisels, hammers, and shovels for excavation. During the excavation process of the test pit, errors are likely to occur, resulting in the dug test pit not being a standard cylinder, thus leading to low accuracy of the detection data. Summary of the Invention

[0005] In order to improve the accuracy of the compaction degree detection data, this application provides a subgrade compaction degree detection device based on the method of digging pits and filling with sand.

[0006] The subgrade compaction degree detection device based on the method of digging pits and filling with sand provided by this application adopts the following technical solutions:

[0007] A subgrade compaction degree detection device based on the pit-digging sand-pouring method, comprising a frame. An installation frame is slidably arranged on the frame in the vertical direction. A measuring cylinder is fixedly arranged on the installation frame, and the axis of the measuring cylinder is vertical. A first driving member for driving the installation frame to slide is arranged on the frame. A drilling cylinder is coaxially and rotatably arranged on the bottom wall of the measuring cylinder. The diameters of the measuring cylinder and the drilling cylinder are both adapted to the diameter of the sand-containing cylinder. A sawtooth is arranged at one end of the drilling cylinder away from the measuring cylinder. A rotating shaft is rotatably arranged in the measuring cylinder, and the rotating shaft is coaxially and fixedly connected with the drilling cylinder. A soil-loosening member for crushing the sandy soil entering the drilling cylinder is arranged on the rotating shaft. A driving source for driving the rotating shaft to rotate is arranged on the installation frame.

[0008] By adopting the above technical solution, when digging a test pit, the frame is moved to the detection site. The rotating shaft is driven to rotate by the driving source, and the installation frame is driven to slide down by the first driving member, so that the drilling cylinder drills the ground to form a test pit. The sandy soil entering the drilling cylinder is scattered by the soil-loosening member and then enters the measuring cylinder. When the drilling cylinder reaches the specified depth, the rotation of the rotating shaft is stopped, and the installation frame is driven to slide up by the first driving member, so that the drilling cylinder disengages from the test pit, and all the sandy soil in the test pit is taken out for compaction degree detection; during the excavation of the test pit, the measuring cylinder is attached to the side wall of the test pit, which can prevent, to a certain extent, the sandy soil from loosening and entering the test pit during the drilling process. The shape of the dug test pit is standard, so it is not easy to have errors, greatly improving the accuracy of the compaction degree detection data; and it can also reduce the labor intensity of the staff to a certain extent, rather than improving the efficiency of digging the test pit, thereby improving the efficiency of compaction degree detection.

[0009] Optionally, the soil-loosening member includes a soil-loosening drill bit. The soil-loosening drill bit is arranged in the drilling cylinder and is coaxially and fixedly connected with the rotating shaft. A plurality of spiral blades are fixedly arranged on the soil-loosening drill bit. The spiral blades are fixedly connected with the inner wall of the drilling cylinder, and there is a clearance fit between adjacent two spiral blades. A plurality of stirring rods are fixedly arranged on the soil-loosening drill bit and between adjacent two spiral blades.

[0010] By adopting the above technical solution, when the rotating shaft rotates, the drill bit rotates together. The sandy soil entering the drilling cylinder is guided by the spiral blades into the space between adjacent two spiral blades, and then enters the measuring cylinder through the clearance between adjacent two spiral blades. When the sandy soil passes through the clearance between adjacent two spiral blades, the stirring rods between the two spiral blades are used to scatter the sandy soil.

[0011] Optionally, a accommodating cavity is provided inside each of the spiral blades, a soil-carrying cloth is arranged in the accommodating cavity, a connecting port connected to the accommodating cavity is provided on the side wall of the spiral blade, a connecting rod is rotatably provided on the loosening drill bit and between each two adjacent spiral blades, the connecting rod is adapted to the connecting port of the spiral blade, one end of the soil-carrying cloth passes through the connecting port on the spiral blade and is fixedly connected to the connecting rod, one end of the connecting rod away from the loosening drill bit abuts against the drill barrel, and a second driving member for driving the multiple connecting rods to rotate is provided on the rotating shaft.

[0012] By adopting the above technical solution, after the test pit is dug to the specified depth, the connecting rod is driven to rotate by the second driving member. The connecting rod rotates, and the soil-carrying cloth is unfolded at the same time to seal the gap between the two adjacent spiral blades. When the measuring cylinder and the drill tube are detached from the test pit, all the sand and soil in the test pit can be brought out, so that the staff does not need to manually dig out the sand and soil in the test pit bit by bit, further reducing the labor intensity of the staff; and the sand and soil directly enter the measuring cylinder and are brought out completely, which to a certain extent prevents the evaporation of water in the sand and soil, thereby further improving the accuracy of the detection data.

[0013] Optionally, a pull rod is slidably provided in the spiral blade, a side of the soil-carrying cloth away from the connecting rod is fixedly connected to the pull rod, and a first elastic member for driving the pull rod to slide away from the connecting port of the spiral blade is provided in the accommodating cavity.

[0014] By adopting the above technical solution, after the measuring cylinder and the drill barrel are separated from the test pit, it is necessary to collect the sand and soil in the measuring cylinder and the drill barrel, and place the collecting device under the drill barrel. At this time, the connecting rod is driven to rotate by the second driving member to open the gap between the two adjacent spiral blades, and the sand and soil in the measuring cylinder and the drill barrel can flow out through the gap between the two adjacent spiral leaves and enter the collecting device for collection; and during the rotation of the connecting rod, the pull rod pulls the soil-carrying cloth to move together under the elastic force of the first elastic member, thereby facilitating the retraction of the soil-carrying cloth into the accommodating cavity.

[0015] Optionally, the second driving member includes a transmission rod, a mounting cavity is opened inside the rotating shaft along the axial direction of the rotating shaft, and the mounting cavity extends into the loosening drill bit, the rotating shaft is rotatably arranged in the mounting cavity, the side wall of the loosening drill bit is opened with a plurality of first through openings connected to the mounting cavity, one end of the connecting rod is passed through the through opening and fixedly connected to the transmission rod, a second through opening connected to the mounting cavity is opened on the side wall of the rotating shaft along the circumference of the rotating shaft, a shift block is fixedly arranged on the transmission rod, and the shift block is slidably passed through the second through opening.

[0016] By adopting the above technical solution, the transmission rod can be rotated in the installation cavity by shifting the shifting block, thereby driving multiple connecting rods to rotate simultaneously.

[0017] Optionally, a chute is axially formed in the side wall of the rotating shaft. A slider is slidably disposed in the chute. A stop block is fixedly disposed on the slider. The stop block is used to abut against the dial block and prevent the dial block from sliding in the second through port. A second elastic member for driving the stop block to slide towards the direction close to the dial block is disposed on the rotating shaft.

[0018] By adopting the above technical solution, the soil-carrying cloth always has a tendency to move towards the accommodating cavity under the elastic force of the first elastic member. After the soil-carrying cloth seals the gap between two adjacent spiral blades, the stop block abuts against the dial block under the elastic force of the second elastic member and prevents the dial block from rotating back, which to a certain extent prevents the soil-carrying cloth from retracting and opens the gap between two adjacent spiral blades.

[0019] Optionally, a receiving groove communicating with the connection port is formed in the side wall of the connection port close to the mounting bracket. A scraper is slidably disposed in the receiving groove. A third elastic member for driving the scraper to slide towards the direction close to the soil-carrying cloth is disposed on the spiral blade, and the scraper abuts against the surface of the soil-carrying cloth.

[0020] By adopting the above technical solution, when the soil-carrying cloth retracts into the accommodating cavity, the sand on the surface of the soil-carrying cloth is scraped off by the scraper, which to a certain extent prevents the sand from entering the accommodating cavity and causing the blockage of the accommodating cavity.

[0021] Optionally, the first driving member includes a servo cylinder. The servo cylinder is fixedly disposed on the frame. The piston rod of the servo cylinder is fixedly connected to the mounting bracket. A travel switch is electrically connected to the servo cylinder. A scale mark is disposed on the side wall of the measuring cylinder. An indicating block for indicating the scale mark on the measuring cylinder is disposed on the frame. The travel switch is fixedly disposed on the indicating block. An abutting ring is slidably sleeved on the measuring cylinder. An indicating mark for indicating the scale line is disposed on the abutting ring. A limiting member for preventing the abutting ring from sliding is disposed on the measuring cylinder. The abutting ring is used to abut against the travel switch on the indicating block.

[0022] By adopting the above technical solution, after the drilling cylinder abuts against the ground of the detection site, the distance between the abutting ring and the indicating block is adjusted by sliding the abutting ring. The distance between the abutting ring and the indicating block is equal to the depth of the test pit, and the sliding of the abutting ring is prevented by the limiting member. When the test pit is being dug, the distance between the abutting ring and the indicating block continuously decreases. When the abutting ring abuts against the travel switch, the servo cylinder immediately stops driving, so that the digging depth of the test pit is more accurate.

[0023] Optionally, the limiting member includes a limiting screw. A fixing block is fixedly disposed on the side wall of the measuring cylinder. A threaded hole is axially formed in the fixing block. The limiting screw passes through the threaded hole and is threadedly connected to the fixing block. The limiting screw is rotatably connected to the abutting ring.

[0024] By adopting the above technical solution, when the limiting screw is rotated, while the limiting screw rotates, it drives the abutting ring to slide along the axial direction of the graduated cylinder. When the limiting screw stops rotating, the abutting ring can be limited.

[0025] In summary, the present application includes at least one of the following beneficial technical effects:

[0026] 1. When digging a test pit, the frame is moved to the detection site. The rotating shaft is driven to rotate by the driving source, and the mounting frame is driven to slide down by the first driving member, so that the drilling cylinder drills the ground to form a test pit. The sandy soil entering the drilling cylinder is dispersed by the soil-loosening member and then enters the graduated cylinder. When the drilling cylinder reaches the specified depth, the rotation of the rotating shaft is stopped, and the mounting frame is driven to slide up by the first driving member, so that the drilling cylinder is disengaged from the test pit, and all the sandy soil in the test pit is taken out for compaction degree detection; during the excavation of the test pit, by attaching the graduated cylinder to the side wall of the test pit, to a certain extent, it prevents the sandy soil from loosening and entering the test pit during the drilling process. The shape of the dug test pit is standard, so it is not easy to have errors, greatly improving the accuracy of the compaction degree detection data; and it can also reduce the labor intensity of the staff to a certain extent, rather than improving the efficiency of digging the test pit, and then improving the efficiency of compaction degree detection;

[0027] 2. After the test pit is dug to the specified depth, the connecting rod is driven to rotate by the second driving member. While the connecting rod rotates, it drives the soil-carrying cloth to unfold, blocking the gaps between adjacent spiral blades. When the graduated cylinder and the drilling cylinder are disengaged from the test pit, all the sandy soil in the test pit can be taken out, so that there is no need for the staff to manually dig out the sandy soil in the test pit little by little, further reducing the labor intensity of the staff; and, the sandy soil directly enters the graduated cylinder and is taken out completely, preventing the evaporation of water in the sandy soil to a certain extent, thereby further improving the accuracy of the detection data. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is the overall structural schematic diagram of the embodiment of the present application;

[0029] Figure 2 is the partial structural schematic diagram of the embodiment of the present application, mainly used to express the structural schematic diagram of the graduated cylinder;

[0030] Figure 3 is Figure 2 the enlarged view of part A in

[0031] Figure 4 is the partial structural schematic diagram of the embodiment of the present application, mainly used to express the structural schematic diagram of the soil-loosening drill bit;

[0032] Figure 5 is Figure 4 the enlarged view of part B in

[0033] Figure 6 is Figure 4 An enlarged view of part C in

[0034] Figure 7 is a partial structural schematic diagram of an embodiment of the present application, mainly used to express the structural schematic diagram of the spiral blade;

[0035] Figure 8 is Figure 7 An enlarged view of part D in

[0036] Explanation of reference numerals: 1, frame; 11, servo cylinder; 111, travel switch; 12, indicating block; 2, mounting bracket; 21, drive source; 3, measuring cylinder; 31, drill cylinder; 32, rotating shaft; 321, soil loosening drill bit; 3211, spiral blade; 32111, soil-carrying cloth; 32112, pull rod; 32113, first elastic member; 32114, scraper; 32115, third elastic member; 3212, stirring rod; 3213, connecting rod; 3214, first through port; 322, transmission rod; 3221, dialing block; 323, second through port; 324, chute; 325, slider; 3251, stop block; 326, second elastic member; 33, abutting ring; 331, indicating mark; 34, limiting screw; 35, fixing block. Detailed implementation manners

[0037] The following will further describe the present application in detail in conjunction with the attached Figure 1-8 drawings.

[0038] An embodiment of the present application discloses a subgrade compaction degree detection device based on the pit-digging sand-filling method. Referring to Figure 1 、 2 , it includes a frame 1, a mounting bracket 2 slidably arranged on the frame 1 in the vertical direction, and a measuring cylinder 3 fixedly arranged on the mounting bracket 2. The axis of the measuring cylinder 3 is vertical, and a drill cylinder 31 coaxially and rotatably arranged at the bottom end of the measuring cylinder 3. The diameters of the measuring cylinder 3 and the drill cylinder 31 are both adapted to the diameter of the sand-containing cylinder. A first driving member for driving the mounting bracket 2 to slide is arranged on the frame 1. A rotating shaft 32 is rotatably arranged in the measuring cylinder 3, and the rotating shaft 32 is coaxially and fixedly connected with the drill cylinder 31. A drive source 21 for driving the rotating shaft 32 to rotate is arranged on the mounting bracket 2.

[0039] Referring to Figure 1 , the first driving member includes a servo cylinder 11. The servo cylinder 11 is fixedly arranged on the frame 1, and the piston rod of the servo cylinder 11 is fixedly connected with the mounting bracket 2.

[0040] Referring to Figure 2 、 3, the servo cylinder 11 is electrically connected to a travel switch 111 when powered on; the side wall of the measuring cylinder 3 is provided with scale lines, on which scales are marked, and the precise unit of the scale is "cm". An indicating block 12 is fixedly arranged on the frame 1, and the travel switch 111 is fixedly arranged on the indicating block 12. When the drill cylinder 31 abuts against the ground, the indicating block 12 indicates at the 0 scale line of the measuring cylinder 3.

[0041] Refer to Figure 2 , a contact ring 33 is slidably sleeved on the measuring cylinder 3. An indicating mark 331 for indicating the scale line is arranged on the bottom wall of the contact ring 33. A limiting member for preventing the contact ring 33 from sliding is arranged on the measuring cylinder 3. The limiting member includes a limiting screw 34. A fixing block 35 is fixedly arranged on the side wall of the measuring cylinder 3 and above the contact ring 33. A threaded hole is axially formed in the fixing block 35 along the measuring cylinder 3. The limiting screw 34 is inserted through the threaded hole and threadedly connected to the fixing block 35. The limiting screw 34 is rotatably connected to the contact ring 33, and the contact ring 33 is used to abut against the travel switch 111 on the indicating block 12.

[0042] After the drill cylinder 31 abuts against the ground of the detection site, by rotating the limiting screw 34, while the limiting screw 34 rotates, it drives the contact ring 33 to slide axially along the measuring cylinder 3, adjusting the distance between the contact ring 33 and the indicating block 12. The distance between the contact ring 33 and the indicating block 12 is equal to the depth of the test pit. When the test pit is being dug, the distance between the contact ring 33 and the indicating block 12 continuously decreases. When the contact ring 33 abuts against the travel switch 111, the servo cylinder 11 immediately stops driving, so as to make the digging depth of the test pit more accurate.

[0043] Refer to Figure 2 , the driving source 21 includes a driving motor. The driving motor is fixedly arranged on the mounting frame 2, and the output shaft of the driving motor is coaxially and fixedly connected to the rotating shaft 32. An annular groove is axially formed in the bottom end of the measuring cylinder 3 along the circumference of the measuring cylinder 3. One end of the drill cylinder 31 is coaxially and fixedly provided with an annular block. The cross section of the annular block is T-shaped. The annular groove is adapted to the annular block. The annular block is rotatably arranged in the annular groove. A sawtooth is fixedly arranged at the end of the drill cylinder 31 away from the measuring cylinder 3.

[0044] Refer to Figure 4, a soil loosening member for loosening the sandy soil entering the drill barrel 31 is provided on the rotating shaft 32. The soil loosening member includes a soil loosening drill bit 321. The soil loosening drill bit 321 is arranged inside the drill barrel 31 and is fixedly connected to the rotating shaft 32 coaxially. A plurality of spiral blades 3211 are fixedly arranged on the side wall of the soil loosening drill bit 321. The spiral blades 3211 are fixedly connected to the inner wall of the drill barrel 31. There is a clearance fit between adjacent two spiral blades 3211, and the distance between adjacent two spiral blades 3211 is equal. A plurality of stirring rods 3212 are fixedly arranged on the soil loosening drill bit 321 and are located between adjacent two spiral blades 3211; while the rotating shaft 32 rotates, it drives the drill bit to rotate together. The sandy soil entering the drill barrel 31 is guided by the spiral blades 3211 into the space between adjacent two spiral blades 3211 and enters the measuring cylinder 3 through the gap between adjacent two spiral blades 3211. When the sandy soil passes through the gap between adjacent two spiral blades 3211, the stirring rods 3212 between the two spiral blades 3211 are used to break up the sandy soil.

[0045] Refer to Figure 4 , 5 , a receiving cavity is formed inside each spiral blade 3211. A soil-carrying cloth 32111 is arranged inside the receiving cavity, and the soil-carrying cloth 32111 is adapted to the gap between adjacent two spiral blades 3211. The receiving cavity is adapted to the soil-carrying cloth 32111. A pull rod 32112 is slidably arranged inside the receiving cavity. One end of the soil-carrying cloth 32111 is fixedly connected to the pull rod 32112. A first elastic member 32113 for driving the pull rod 32112 to slide towards the direction close to the measuring cylinder 3 is arranged inside the receiving cavity. The first elastic member 32113 includes a first tension spring. A plurality of first tension springs are provided. A plurality of placing grooves communicating with the receiving cavity are formed on the side wall of the receiving cavity close to the measuring cylinder 3. One first tension spring is placed inside each placing groove. One end of the first tension spring is fixedly connected to the bottom wall of the placing groove, and the other end of the first tension spring is fixedly connected to the pull rod 32112.

[0046] Refer to Figure 5 , a connection port communicating with the receiving cavity is formed on the side wall of the spiral blade 3211. A connecting rod 3213 is rotatably arranged on the soil loosening drill bit 321 and is located between every two adjacent spiral blades 3211. The connecting rod 3213 is adapted to the connection port of the spiral blade 3211. One end of the soil-carrying cloth 32111 passes through the connection port on the spiral blade 3211 and is fixedly connected to the connecting rod 3213. One end of the soil-carrying cloth 32111 passes through the connection port on the spiral blade 3211 and is fixedly connected to the connecting rod 3213.

[0047] Refer to Figure 5 , 6A second driving member for driving a plurality of connecting rods 3213 to rotate is provided on the rotating shaft 32, and the second driving member includes a transmission rod 322. A mounting cavity is provided inside the rotating shaft 32 along the axial direction of the rotating shaft 32, and the mounting cavity extends into the loosening drill bit 321. The rotating shaft 32 is rotatably arranged in the mounting cavity. A first through opening 3214 communicating with the mounting cavity is provided on the side wall of the loosening drill bit 321 and between each two adjacent spiral leaves 3211. One end of the connecting rod 3213 is passed through the through opening and fixedly connected to the transmission rod 322. A second through opening 323 communicating with the mounting cavity is provided on the side wall of the rotating shaft 32 along the circumferential direction of the rotating shaft 32. A shift block 3221 is fixedly provided on the transmission rod 322, and the shift block 3221 is slidably passed through the second through opening 323.

[0048] After the test pit is dug to the specified depth, the transmission rod 322 is rotated in the installation cavity by toggling the dial block 3221, which can drive multiple connecting rods 3213 to rotate simultaneously. When the connecting rods 3213 rotate, the soil-carrying cloth 32111 is unfolded to seal the gap between two adjacent spiral leaves 3211. When the measuring cylinder 3 and the drill tube 31 are separated from the test pit, all the sand and soil in the test pit can be taken out, so that the staff does not need to manually dig out the sand and soil in the test pit bit by bit, which further reduces the labor intensity of the staff.

[0049] Reference Figure 6 The side wall of the rotating shaft 32 is provided with a sliding groove 324 along the axial direction of the rotating shaft 32, and a sliding block 325 is slidably arranged in the sliding groove 324, and the cross section of the sliding block 325 is T-shaped, the sliding groove 324 is adapted to the sliding block 325, and a stopper 3251 is fixedly arranged on the sliding block 325. The rotating shaft 32 is provided with a second elastic member 326 for driving the stopper 3251 to slide in the direction close to the shift block 3221. The second elastic member 326 includes a second tension spring, which is arranged in the sliding groove 324, one end of the second tension spring is fixedly connected to the side wall of the sliding groove 324 close to the shift block 3221, and the other end of the second tension spring is fixedly connected to the sliding block 325. When the sliding block 325 is driven only by the elastic force of the second tension spring, the projection of the stopper 3251 on the rotating shaft 32 covers the second opening 323, and the side wall of the stopper 3251 is provided with anti-slip grooves.

[0050] Reference Figure 7 , 8A receiving groove connected to the connecting port is provided on the side wall near the mounting frame 2, a scraper 32114 is slidably arranged in the receiving groove, a limiting block is fixedly arranged on the side wall of the scraper 32114, a limiting groove connected to the receiving groove is provided on the side wall of the receiving groove along the sliding direction of the scraper 32114, the limiting block is slidably arranged in the limiting groove, a third elastic member 32115 for driving the scraper 32114 to slide toward the soil-carrying cloth 32111 is provided on the spiral leaf 3211, the third elastic member 32115 includes a compression spring, which is arranged in the receiving groove, one end of the compression spring abuts against the bottom wall of the receiving groove, and the other end of the compression spring abuts against the scraper 32114.

[0051] The implementation principle of the roadbed compaction detection device based on the pit digging and sand filling method in the embodiment of the present application is: when digging a test pit, the frame 1 is moved to the detection site, and the drill barrel 31 is driven to slide by the servo cylinder 11, so that the drill barrel 31 abuts against the ground of the detection site, and the limit screw 34 is rotated. While the limit screw 34 rotates, the abutment ring 33 is driven to slide along the axial direction of the measuring cylinder 3, and the distance between the abutment ring 33 and the indicator block 12 is adjusted. The distance between the abutment ring 33 and the indicator block 12 is equal to the depth of the test pit.

[0052] Afterwards, the rotating shaft 32 is driven to rotate by the driving motor, and the mounting frame 2 is driven to slide down by the servo cylinder 11, so that the drill barrel 31 drills a hole in the ground to form a test pit. The sand and soil entering the drill barrel 31 enters between the two adjacent spiral leaves 3211 through the guidance of the spiral leaves 3211, and enters the measuring cylinder 3 through the gap between the two adjacent spiral leaves 3211. When the sand and soil pass through the gap between the two adjacent spiral leaves 3211, the stirring rod 3212 between the two spiral leaves 3211 breaks up the sand and soil. When the drill barrel 31 reaches the specified depth, the abutment ring 33 abuts against the travel switch 111, and the servo cylinder 11 stops driving, and the driving motor stops.

[0053] By toggling the dial block 3221, the transmission rod 322 is rotated in the installation cavity, driving multiple connecting rods 3213 to rotate at the same time. When the connecting rod 3213 rotates, the soil-carrying cloth 32111 is expanded to block the gap between the two adjacent spiral leaves 3211. The servo cylinder 11 drives the mounting frame 2 to slide up, so that the drill tube 31 is separated from the test pit, thereby taking out all the sand and soil in the test pit, and performing compaction detection on the sand and soil taken out of the test pit. During the excavation of the test pit, the measuring cylinder 3 is fitted to the side wall of the test pit, which prevents the sand and soil from loosening and entering the test pit during the drilling process to a certain extent. The shape of the excavated test pit is standard, so it is not easy to have errors, which greatly improves the accuracy of the compaction detection data. It can also reduce the labor intensity of the staff to a certain extent, not only improve the efficiency of the test pit excavation, but also improve the efficiency of the compaction detection.

[0054] The above are all preferred embodiments of the present application, and do not limit the protection scope of the present application. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application shall be covered within the protection scope of the present application.

Claims

1. A subgrade compactness detection device based on the method of digging pits and filling with sand, characterized in that: It includes a frame (1), on which an installation frame (2) is slidably arranged in the vertical direction. A measuring cylinder (3) is fixedly arranged on the installation frame (2), and the axis of the measuring cylinder (3) is vertical. A first driving member for driving the installation frame (2) to slide is arranged on the frame (1). A drilling cylinder (31) is coaxially rotatably arranged on the bottom wall of the measuring cylinder (3). The diameters of the measuring cylinder (3) and the drilling cylinder (31) are both adapted to the diameter of the sand-containing cylinder. A sawtooth is arranged at one end of the drilling cylinder (31) away from the measuring cylinder (3). A rotating shaft (32) is rotatably arranged in the measuring cylinder (3), and the rotating shaft (32) is coaxially and fixedly connected with the drilling cylinder (31). A soil-loosening member for crushing the sandy soil entering the drilling cylinder (31) is arranged on the rotating shaft (32). A driving source (21) for driving the rotating shaft (32) to rotate is arranged on the installation frame (2); The soil-loosening member includes a soil-loosening drill bit (321), which is arranged in the drilling cylinder (31) and is coaxially and fixedly connected with the rotating shaft (32). A plurality of spiral blades (3211) are fixedly arranged on the soil-loosening drill bit (321). The spiral blades (3211) are fixedly connected with the inner wall of the drilling cylinder (31), and there is a clearance fit between adjacent two spiral blades (3211). A plurality of stirring rods (3212) are fixedly arranged on the soil-loosening drill bit (321) and located between adjacent two spiral blades (3211); An accommodating cavity is formed inside each spiral blade (3211). A soil-carrying cloth (32111) is arranged in the accommodating cavity. A connecting port communicating with the accommodating cavity is formed on the side wall of the spiral blade (3211). A connecting rod (3213) is rotatably arranged on the soil-loosening drill bit (321) and located between every two adjacent spiral blades (3211). The connecting rod (3213) is adapted to the connecting port of the spiral blade (3211). One end of the soil-carrying cloth (32111) passes through the connecting port on the spiral blade (3211) and is fixedly connected with the connecting rod (3213). The end of the connecting rod (3213) away from the soil-loosening drill bit (321) abuts against the drilling cylinder (31). A second driving member for driving a plurality of connecting rods (3213) to rotate is arranged on the rotating shaft (32); A pull rod (32112) is slidably arranged inside the spiral blade (3211). The side of the soil-carrying cloth (32111) away from the connecting rod (3213) is fixedly connected with the pull rod (32112). A first elastic member (32113) for driving the pull rod (32112) to slide away from the connecting port of the spiral blade (3211) is arranged in the accommodating cavity.

2. The subgrade compaction degree detection device based on the pit filling and sand replacement method according to claim 1, characterized in that: The second driving member includes a transmission rod (322). An installation cavity is axially formed inside the rotating shaft (32) along the axial direction of the rotating shaft (32), and the installation cavity extends into the soil loosening drill bit (321). The rotating shaft (32) is rotatably arranged in the installation cavity. A plurality of first through openings (3214) communicating with the installation cavity are formed in the side wall of the soil loosening drill bit (321). One end of the connecting rod (3213) penetrates through the through opening and is fixedly connected to the transmission rod (322). A second through opening (323) communicating with the installation cavity is formed in the side wall of the rotating shaft (32) along the circumferential direction of the rotating shaft (32). A shifting block (3221) is fixedly arranged on the transmission rod (322), and the shifting block (3221) slidably penetrates through the second through opening (323).

3. The subgrade compaction degree detection device based on the pit filling and sand replacement method according to claim 2, wherein: A chute (324) is axially formed in the side wall of the rotating shaft (32) along the axial direction of the rotating shaft (32). A slider (325) is slidably arranged in the chute (324). A stop block (3251) is fixedly arranged on the slider (325). The stop block (3251) is used to abut against the shifting block (3221) and prevent the shifting block (3221) from sliding in the second through opening (323). A second elastic member (326) is arranged on the rotating shaft (32) and is used to drive the stop block (3251) to slide towards the shifting block (3221).

4. The subgrade compactness detection device based on the pit filling and sand replacement method according to claim 1, wherein: A receiving groove communicating with the connection port is formed in the side wall of the connection port close to the mounting frame (2). A scraper (32114) is slidably arranged in the receiving groove. A third elastic member (32115) is arranged on the spiral blade (3211) and is used to drive the scraper (32114) to slide towards the soil-carrying cloth (32111). And the scraper (32114) abuts against the surface of the soil-carrying cloth (32111).

5. The subgrade compaction degree detection device based on the pit filling and sand replacement method according to claim 1, characterized in that: The first driving member includes a servo cylinder (11). The servo cylinder (11) is fixedly arranged on the frame (1). The piston rod of the servo cylinder (11) is fixedly connected to the mounting frame (2). A travel switch (111) is electrically connected to the servo cylinder (11). A scale mark is arranged on the side wall of the measuring cylinder (3). An indicating block (12) is arranged on the frame (1) and is used to indicate the scale mark on the measuring cylinder (3). The travel switch (111) is fixedly arranged on the indicating block (12). An abutting ring (33) is slidably sleeved on the measuring cylinder (3). An indicating mark (331) for indicating the scale line is arranged on the abutting ring (33). A limiting member is arranged on the measuring cylinder (3) to prevent the abutting ring (33) from sliding. The abutting ring (33) is used to abut against the travel switch (111) on the indicating block (12).

6. The subgrade compaction degree detection device based on the pit filling and sand replacement method according to claim 5, characterized in that: The limiting member includes a limiting screw (34). A fixing block (35) is fixedly arranged on the side wall of the measuring cylinder (3). A threaded hole is axially formed in the fixing block (35) along the axial direction of the measuring cylinder (3). The limiting screw (34) penetrates through the threaded hole and is threadedly connected to the fixing block (35). The limiting screw (34) is rotatably connected to the abutting ring (33).

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