An integrated testing device for constant temperature curing and loading in the preparation of mixing piles

Abstract

This invention discloses an integrated constant-temperature curing and loading test device for mixing pile preparation, relating to the field of mixing pile preparation technology. It includes a refrigerator, a constant-temperature device, a loading device, and a multi-angle mixing pile preparation device. This integrated constant-temperature curing and loading test device for mixing pile preparation improves the temperature control accuracy of conventional refrigerators through the coordination of heating and cooling, and ensures the uniformity of the temperature field within the chamber. From pile preparation and curing to loading, the entire process is completed within the same constant-temperature space, eliminating interference caused by process transitions. Ultimately, it accurately simulates the reinforcement process and effect of inclined cement-soil mixing piles in high-temperature frozen soil subgrades, solving the test errors caused by temperature fluctuations and process separation in traditional methods. By quickly adjusting the angle of the mixing rod and selecting different nozzle combinations, one device can simulate multiple construction processes, meeting different scientific research and experimental needs and improving the flexibility of use.

Description

Technical Field

[0001] This invention relates to the field of mixing pile preparation technology, specifically to an integrated constant temperature curing and loading test device for mixing pile preparation. Background Technology

[0002] With the gradual rise in global temperatures, high-temperature permafrost sections are continuously emerging, leading to ongoing thaw settlement and damage to existing permafrost embankments. Reinforcing existing high-temperature permafrost subgrades using inclined cement-soil mixing piles is an effective means of reducing thaw settlement. Model tests are an important way to study the reinforcement effect of inclined cement-soil mixing piles on existing high-temperature permafrost subgrades, and to optimize the design of these piles. However, high-temperature permafrost is extremely sensitive to temperature changes, which directly affect the test results. From the preparation and curing of the mixing piles to their loading, precise constant temperature conditions are required.

[0003] Existing methods for preparing experimental cement-soil mixing piles typically require pre-drilling holes in the soil and then pouring the mixed cement-soil mixture into these holes. This method struggles to simulate the actual preparation process of mixing piles. If a conventional refrigerator is used for curing, the temperature fluctuations exceed 0.5℃, and the temperature distribution within the refrigerator is uneven, severely impacting the results of high-temperature frozen soil model tests. After curing, loading requires transferring the model box from the curing chamber to the loading machine. During this transfer, the surrounding soil remains at room temperature, further affecting the accuracy of the experiment. Therefore, there is a need to develop an integrated constant-temperature curing and loading testing device for mixing pile preparation, providing a reliable and accurate testing platform for the application research of inclined cement-soil mixing piles. Summary of the Invention

[0004] The purpose of this invention is to provide an integrated constant temperature curing and loading test device for the preparation of mixing piles, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an integrated test device for constant temperature curing and loading in the preparation of mixing piles, comprising a refrigerator, a constant temperature device, a loading device, and a multi-angle mixing pile preparation device. The constant temperature device is connected to one side of the refrigerator, and the loading device is connected to the other side of the refrigerator. The multi-angle mixing pile preparation device is arranged on both sides of the loading device. A first partition is installed in the middle of the refrigerator, and an air outlet is opened on one side of the bottom of the first partition, and an air inlet is opened on the other side of the bottom of the first partition. A temperature sensor is connected to the middle of the first partition. A relay and a thermostat are installed sequentially on one side of the inner wall of the refrigerator. An air heater is installed on the side of the first partition near the air inlet, and a second partition is arranged outside the air heater. One side of the outer wall of the second partition is connected to the inner wall of the refrigerator. An axial flow fan is installed in the middle of the outer wall of the second partition.

[0006] Inside the refrigerator, near the side of the multi-angle mixing pile preparation device, a reaction frame body is installed. The reaction frame body includes an upper reaction frame plate, a lower reaction frame plate, and a column. The top of the reaction frame body is the upper reaction frame plate, and the top of the reaction frame body is the lower reaction frame plate. A column is connected to the top edge of the lower reaction frame plate. A model box is connected to the top center of the lower reaction frame plate, and a pressure plate is installed at the top center of the model box. A hydraulic jack is installed at the top center of the pressure plate, and a force gauge is installed on the top of the hydraulic jack. The force gauge is connected to the bottom of the upper reaction frame plate. Displacement gauges are installed on both sides of the outer wall of the hydraulic jack, and the bottom of the displacement gauges is connected to the pressure plate.

[0007] The multi-angle mixing pile preparation device includes a hollow drill rod, and the outer wall of the hollow drill rod is provided with multiple sets of detachable mixing rods. The outer wall of the mixing rod is provided with spray holes, which are of three types: inclined downward, horizontal on the side, and inclined upward.

[0008] From pile making and curing to loading, the entire process is completed in the same constant temperature space, eliminating the interference caused by process transitions, and ultimately accurately simulating the reinforcement process and effect of inclined cement-soil mixing piles in high-temperature frozen soil subgrade.

[0009] Preferably, bolt holes are provided on the upper edges of both sides of the model box, and the bolt holes are connected to the base through the first bolt, and the top of the base is connected to the first motor through the third bolt. A first steel plate is welded to one side of the top of the base, and a second steel plate is welded to the other side of the top of the base.

[0010] Preferably, a first coupling is installed at the output end of the first motor. A lead screw is connected inside the first coupling, and a slider is threadedly connected to the outer wall of the lead screw. A threaded hole is opened on one side of the slider, and a first hole is opened on the other side of the slider. A slide rail is slidably connected inside the first hole.

[0011] The first motor drives the lead screw to rotate, which in turn moves the slider along the slide rail. The second motor is connected to the slider by the fourth bolt, and the movement of the slider will drive the second motor to move synchronously.

[0012] Preferably, the top of the slider is connected to a second motor via a fourth bolt, and the output end of the second motor is connected to a hollow drill rod. A limit ring is rotatably connected to the outer wall of the hollow drill rod. An equally spaced feed hole is opened on the side of the hollow drill rod near the limit ring. A nozzle is connected to the opening on the outer wall of the limit ring. A cement pump is connected to one side of the outer wall of the nozzle. A second hole corresponding to the hollow drill rod is opened inside the second steel plate.

[0013] Preferably, the base is a mounting seat below, and a scale plate is connected to the top of the mounting seat. The base and the mounting seat are connected by a second bolt. A pointer is slidably connected to the outer wall of the scale plate, and the pointer is fixedly connected to the base.

[0014] The base is fixed to the preset position of the model box by the first bolt; the base is adjusted to the required angle, and after accurate reading by the scale plate and pointer, it is locked by the second bolt.

[0015] Preferably, the hollow drill rod has equally spaced slots on its outer wall, and a base is connected inside the slots. The base has a "U" shaped structure. The hollow drill rod has a discharge hole on the side near the slot, and the discharge holes are distributed at equal angles. The middle part of the outer wall of the base is connected to the stirring rod.

[0016] By moving the base and engaging the slot on the outer wall of the hollow drill rod, the extension strip at the bottom of one set of bases is inserted into the limiting groove at the bottom of another set of bases. Then, the screw is rotated to lock the base, so that the bases are assembled into a circle. Then, the threaded pin is rotated to engage the base with the outer wall of the hollow drill rod, thereby restricting the base and preventing it from rotating axially.

[0017] Preferably, the stirring rod has a feeding groove inside, and the discharge hole, spray hole and feeding groove form a feeding channel. The outer walls of the base are internally threaded with threaded pins, and the outer wall of the hollow drill rod has threaded holes corresponding to the threaded pins. The threaded holes are located in the slot and are distributed at equal angles.

[0018] Cement raw materials are sequentially passed through the hollow drill rod, feed hole, mixing rod, and discharge hole, allowing the cement raw materials to enter the mold box and complete the preparation of the mixing pile.

[0019] Preferably, an extension seat is fixedly connected to the side of the base near the stirring rod, and a rubber strip is connected inside the extension seat. The outer wall of the rubber strip is fixedly connected to the outer wall of the hollow drill rod, and the rubber strips are distributed at equal angles. An extension strip is fixedly connected to one side of the bottom end of the base, and a limiting groove corresponding to the extension strip is opened on the other side of the bottom end of the base.

[0020] By rotating the base, the stirring rod and the extension seat rotate together, causing the extension seat to detach from the rubber strip inside and move to the vicinity of the next set of rubber strips to squeeze it until the rubber strip enters the interior of the extension seat. The resistance felt during the above operation will indicate to the operator that the base in the splicing state has rotated to a certain degree.

[0021] As can be seen from the above, the integrated constant temperature curing and loading test equipment for mixing pile preparation provided by the present invention has the following beneficial effects.

[0022] 1. By coordinating heating and cooling, the temperature fluctuation of conventional refrigerators, which is above ±0.5℃, is improved to a temperature control accuracy of ±0.1℃, while ensuring the uniformity of the temperature field inside the chamber, thus meeting the stringent temperature requirements of high-temperature frozen soil tests. From pile making and curing to loading, the entire process is completed in the same constant temperature space, eliminating the interference caused by process transitions. Ultimately, it accurately simulates the reinforcement process and effect of inclined cement-soil mixing piles in high-temperature frozen soil subgrades, solving the test errors caused by temperature fluctuations and process separation in traditional methods.

[0023] 2. By quickly adjusting the angle of the stirring rod and selecting different combinations of nozzles, one device can simulate multiple construction processes, meet different scientific research and experimental needs, and improve the flexibility of use. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 This is a schematic diagram of the temperature controller structure of the present invention;

[0026] Figure 3 This is a schematic diagram of the temperature controller circuit of the present invention;

[0027] Figure 4 This is a schematic diagram of the three-dimensional structure of the model box of the present invention;

[0028] Figure 5 This is a schematic diagram of the three-dimensional structure of the hollow drill rod of the present invention;

[0029] Figure 6 This is a schematic diagram of the hollow drill rod structure of the present invention;

[0030] Figure 7 This is a schematic diagram of the three-dimensional structure of the stirring rod of the present invention;

[0031] Figure 8 This is a schematic diagram of the three-dimensional structure of the hollow drill rod of the present invention;

[0032] Figure 9 This is a schematic diagram of the main structure of the hollow drill rod of the present invention;

[0033] Figure 10 This is a schematic diagram of the three-dimensional cross-sectional structure of the hollow drill rod of the present invention;

[0034] Figure 11 This is a schematic diagram of the front sectional view of the hollow drill rod of the present invention;

[0035] Figure 12 This is a side view of the base structure of the present invention;

[0036] Figure 13 This is a three-dimensional structural diagram of the base assembly state of the present invention;

[0037] Figure 14 This is a schematic diagram of the three-dimensional structure of the base of the present invention;

[0038] Figure 15 This is a schematic diagram of the three-dimensional cross-sectional structure of the extension seat of the present invention;

[0039] Figure 16 This is a schematic diagram of the three-dimensional cross-sectional structure of the stirring rod of the present invention;

[0040] Figure 17 This is a schematic diagram of the front sectional view of the stirring rod of the present invention;

[0041] Figure 18 This is a schematic diagram of the first embodiment of the stirring rod of the present invention;

[0042] Figure 19 This is a schematic diagram of a second embodiment of the stirring rod of the present invention.

[0043] In the diagram: 1. Refrigerator; 2. Temperature control device; 3. Loading device; 4. Multi-angle mixing pile preparation device; 5. First partition plate; 6. Relay; 7. Air outlet; 8. Thermostat; 9. Temperature sensor; 10. Air inlet; 11. Air heater; 12. Second partition plate; 13. Axial flow fan; 14. Cement pump; 15. Spray pipe; 16. Upper plate of reaction frame; 17. Force gauge; 18. Hydraulic jack; 19. Displacement gauge; 20. Main body of reaction frame; 21. Pressure plate; 22. Model box; 23. Lower plate of reaction frame; 24. Bolt hole; 25. Column; 26. First motor; 27. Second steel plate; 28. Slider; 29. ​​Threaded hole; 30. Slide rail; 31. Base; 32. Lead screw; 33. First steel plate; 34. First bolt; 35. Second motor; 36. Hole No. 1; 37. Hole-shaped drill rod; 38. Hole No. 2; 39. Third bolt; 40. First coupling; 41. Fourth bolt; 42. Limiting ring; 43. Pointer; 44. Scale plate; 45. Second bolt; 46. Stirring rod; 47. Spray hole; 48. Feed hole; 49. Slot; 50. Base; 51. Discharge hole; 52. Threaded pin; 53. Extension seat; 54. Rubber strip; 55. Extension strip; 56. Limiting groove. Detailed Implementation

[0044] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0045] Please see Figures 1-19This invention provides a technical solution: an integrated test device for constant temperature curing and loading for preparing mixing piles, comprising a refrigerator 1, a constant temperature device 2, a loading device 3, and a multi-angle mixing pile preparation device 4. The constant temperature device 2 is connected to one side of the refrigerator 1, and the loading device 3 is connected to the other side of the refrigerator 1. The multi-angle mixing pile preparation device 4 is arranged on both sides of the loading device 3. A first partition 5 is installed in the middle of the refrigerator 1, and an air outlet 7 is opened on one side of the bottom end of the first partition 5, and an air inlet 10 is opened on the other side of the bottom end of the first partition 5. A temperature sensor 9 is connected to the middle of the first partition 5. A relay 6 and a thermostat 8 are installed sequentially on one side of the inner wall of the refrigerator 1. An air heater 11 is installed on the side of the first partition 5 near the air inlet 10, and a second partition 12 is arranged on the outside of the air heater 11. One side of the outer wall of the second partition 12 is connected to the inner wall of the refrigerator 1. An axial flow fan 13 is installed in the middle of the outer wall of the second partition 12.

[0046] Inside the refrigerator 1, near the side of the multi-angle mixing pile preparation device 4, a reaction frame body 20 is installed. The reaction frame body 20 includes a reaction frame upper plate 16, a reaction frame lower plate 23, and a column 25. The top of the reaction frame body 20 is the reaction frame upper plate 16, and the top of the reaction frame body 20 is the reaction frame lower plate 23. The top edge of the reaction frame lower plate 23 is connected to the column 25. The top middle of the bottom of the reaction frame lower plate 23 is connected to the model box 22. The top middle of the model box 22 is equipped with a pressure plate 21. The top middle of the pressure plate 21 is equipped with a hydraulic jack 18. The top of the hydraulic jack 18 is equipped with a force gauge 17. The force gauge 17 is connected to the bottom of the reaction frame upper plate 16. Displacement gauges 19 are provided on both sides of the outer wall of the hydraulic jack 18. The bottom of the displacement gauges 19 is connected to the pressure plate 21.

[0047] Bolt holes 24 are provided on the upper edges of both sides of the model box 22, and the bolt holes 24 are connected to the base 31 through the first bolt 34. The top of the base 31 is connected to the first motor 26 through the third bolt 39. A first steel plate 33 is welded to one side of the top of the base 31, and a second steel plate 27 is welded to the other side of the top of the base 31. A first coupling 40 is installed at the output end of the first motor 26. A lead screw 32 is connected inside the first coupling 40, and a slider 28 is threaded to the outer wall of the lead screw 32. A threaded hole 29 is provided on one side of the inside of the slider 28, and a first hole 36 is provided on the other side of the inside of the slider 28. A slide rail 30 is slidably connected inside the first hole 36. The top of the slider 28 is connected to the first bolt 39 through the third bolt 39. The second motor 35 is connected to the four bolts 41, and the output end of the second motor 35 is connected to the hollow drill rod 37. The outer wall of the hollow drill rod 37 is rotatably connected to the limit ring 42. The hollow drill rod 37 has equally spaced feed holes 48 on the side near the limit ring 42. The outer wall of the limit ring 42 is connected to the nozzle 15. The outer wall of the nozzle 15 is connected to the cement pump 14. The second steel plate 27 has a second hole 38 corresponding to the hollow drill rod 37. The base 31 is below the mounting seat. The top of the mounting seat is connected to the scale plate 44. The base 31 and the mounting seat are connected by the second bolt 45. The outer wall of the scale plate 44 is slidably connected to the pointer 43, and the pointer 43 is fixedly connected to the base 31.

[0048] In practice, the constant temperature device 2 and the loading device 3 are located inside the refrigerator 1. The constant temperature device 2 is used for precise temperature control of the refrigerator 1, and the loading device 3 enables loading of the model under constant temperature. The multi-angle mixing pile preparation device 4 is located on the model box 22 to realize the preparation of multi-angle mixing piles.

[0049] The constant temperature device 2 includes an air heater 11, an axial fan 13, a temperature sensor 9, a relay 6, and a thermostat 8. The air heater 11 is a 1200W PTC heater, suspended at the air inlet 10 of the first partition 5, heating the air passing through it. The axial fan 13 is a 220V SF axial fan, model 200-2P, installed on the second partition 12 to dissipate heat from the air heater 11. Air inside the refrigerator 1 enters through the air inlet 10 under the action of the axial fan 13, circulates once inside the refrigerator 1, and then returns to the axial fan 13 from the air outlet 7, achieving air circulation. The temperature sensor 9 is a PT100 platinum resistance thermometer, suspended in the middle of the refrigerator 1, measuring the real-time temperature. The relay 6 is an SSR-40DA solid-state relay, installed on the inner wall of the refrigerator 1; the thermostat 8 is a REX-C100 intelligent thermostat, embedded in the side wall of the refrigerator 1.

[0050] The positive terminal of the temperature sensor 9 is connected to the signal input terminal 8 of the temperature controller 8, and the negative terminal is connected to the signal input terminals 9 and 10 of the temperature controller 8. The output terminal 4 of the temperature controller 8 is connected to the terminal 3 of the relay 6 via a wire, and the terminal 5 is connected to the terminal 4 of the relay 6 via a wire. The live wire of the air heater 11 is connected to the terminal 1 of the relay 6 via a wire, and the neutral wire of the air heater 11 and the axial flow fan 13 are connected in parallel to the terminal 2 of the temperature controller 8 via a wire. A wire is led out from the terminal 2 of the relay 6 and connected in parallel with the live wire of the axial flow fan 13 to the terminal 1 of the temperature controller 8. The live wire of the input power supply is connected to the terminal 1 of the temperature controller 8, and the neutral wire is connected to the terminal 2 of the temperature controller 8.

[0051] First, the thermostat 8 is powered on, and the axial fan 13 starts working to circulate the air inside the refrigerator 1. A temperature is set on the thermostat 8, and the temperature sensor 9 transmits the temperature measured in real time to the thermostat 8. If the set temperature is higher than the actual temperature, the thermostat 8 controls the relay 6 to close, and the air heater 11 starts heating. When the set temperature is reached, the thermostat 8 controls the relay 6 to open, and the air heater 11 stops heating, thereby accurately controlling the temperature of the refrigerator 1.

[0052] The loading device 3 includes a model box 22, a pressure plate 21, a hydraulic jack 18, a force gauge 17, and a displacement gauge 19. The reaction frame body 20 consists of four columns 25 connecting the upper plate 16 and the lower plate 23 of the reaction frame, and is used to provide reaction force to the model soil.

[0053] Bolt holes 24 are provided on both sides of the upper edge of the model box 22. The bolt holes 24 are used to connect the multi-angle mixing pile preparation device 4. The bearing plate 21 is placed in the center of the soil sample inside the model box 22 to bear the pressure. The hydraulic jack 18 is placed in the center of the bearing plate 21 to provide pressure. The force gauge 17 is placed above the center of the hydraulic jack 18 or below the upper plate 16 of the reaction frame to monitor the pressure in real time. The displacement gauge 19 is installed below the upper plate 16 of the reaction frame, and its measuring needle is placed above the bearing plate 21 to monitor the displacement of the soil in real time during the loading process.

[0054] The multi-angle mixing pile preparation device 4 includes a base 31, a scale plate 44, a slide rail 30, a slider 28, a first motor 26, a second motor 35, a hollow drill rod 37, a mixing rod 46, and a cement pump 14. The base 31 is connected to the model box 22 by a first bolt 34, and different bolt holes 24 can be connected to lock it at any position on the edge of the model box 22; the first steel plate 33 and the second steel plate 27 on the base 31 are welded to the base 31; the lower end of the base 31 has a scale plate 44 and a pointer 43, which can be used to visually see the angle of the base 31; after the base 31 is rotated around the second bolt 45 to a specified angle, the second bolt 45 is locked.

[0055] In practice, the thermostat 8 is first powered on, and the axial fan 13 is started to circulate the air inside the refrigerator 1. The temperature sensor 9 monitors the temperature inside the refrigerator in real time and sends feedback to the thermostat 8. When the set temperature is higher than the actual temperature, the thermostat 8 activates the air heater 11 via the relay 6 to heat the refrigerator; once the set temperature is reached, the thermostat 8 controls the relay 6 to disconnect, stopping the heating. Through this closed-loop control system, combined with the forced circulation effect of the axial fan 13, precise control and uniform distribution of the internal temperature of the refrigerator 1 are achieved.

[0056] The loading device 3 includes a reaction frame body 20, a model box 22, a pressure plate 21, a hydraulic jack 18, a force gauge 17, and a displacement gauge 19. The reaction frame body 20 is composed of four columns 25 connecting the upper plate 16 and the lower plate 23 of the reaction frame, providing loading reaction force for the system. Bolt holes 24 are provided on both sides of the upper edge of the model box 22 for connecting the mixing pile preparation device. The pressure plate 21 is placed at the center of the soil sample surface to transfer the load, and the hydraulic jack 18 applies vertical pressure to it. The force gauge 17 monitors the load value in real time, and the displacement gauge 19 accurately measures the settlement deformation of the soil during the loading process.

[0057] The base 31 is fixed to the preset position of the model box 22 by the first bolt 34; the base 31 is adjusted to the required angle, and after accurate reading by the scale plate 44 and pointer 43, it is locked by the second bolt 45; then the first motor 26 is started to drive the lead screw 32 to rotate, which drives the slider 28 to move along the slide rail 30; the second motor 35 is connected to the slider 28 by the fourth bolt 41, and the movement of the slider 28 will drive the second motor 35 to move synchronously.

[0058] The second motor 35 starts and drives the hollow drill rod 37 to rotate. Since the limiting ring 42 is rotatably connected to the hollow drill rod 37 and the limiting ring 42 is restricted by the nozzle 15, the limiting ring 42 will remain relatively stationary during the rotation of the hollow drill rod 37 until the hollow drill rod 37 drives the mixing rod 46 to extend into the reserved hole in the model box 22. While rotating, the hollow drill rod 37 sprays cement into the reserved hole inside the mixing model box 22. Then the hollow drill rod 37 is separated from the reserved hole and forms an inclined cement mixing pile after curing, which is convenient for subsequent loading tests. Specifically, a lattice column can be pre-embedded inside the reserved hole (this is existing technology and will not be described in detail).

[0059] By coordinating heating and cooling, the temperature fluctuation of conventional refrigerators, which is above ±0.5℃, is improved to a temperature control accuracy of ±0.1℃, while ensuring the uniformity of the temperature field inside the chamber, thus meeting the stringent temperature requirements of high-temperature frozen soil tests. By setting the angle through the scale plate 44 and pointer 43 and locking the base 31 with the second bolt 45, the preparation of inclined piles with different inclination angles can be realized. From pile making and curing to loading, the entire process is completed in the same constant temperature space, eliminating the interference caused by process transitions. Ultimately, it accurately simulates the reinforcement process and effect of inclined cement-soil mixing piles in high-temperature frozen soil subgrades, solving the test errors caused by temperature fluctuations and process separation in traditional methods.

[0060] The multi-angle mixing pile preparation device 4 includes a hollow drill rod 37, and the outer wall of the hollow drill rod 37 is provided with multiple sets of detachable mixing rods 46. The outer wall of the mixing rods 46 is provided with spray holes 47, which are of three types: inclined downwards, horizontal on the side, and inclined upwards. The outer wall of the hollow drill rod 37 is provided with equally spaced slots 49, and a base 50 is connected inside the slots 49. The base 50 has a "U" shaped structure. A discharge hole 51 is provided on the side of the hollow drill rod 37 near the slots 49, and the discharge holes 51 are distributed at equal angles. The middle of the outer wall of the base 50 is connected to the mixing rods 46. A feeding trough is provided inside the mixing rods 46 for discharging material. The hole 51, the spray hole 47 and the feeding trough form a feeding channel. The inner sides of the outer wall of the base 50 are threaded with threaded pins 52, and the outer wall of the hollow drill rod 37 is provided with threaded holes corresponding to the threaded pins 52. The threaded holes are located in the slot 49 and are distributed at equal angles. An extension seat 53 is fixedly connected to the side of the base 50 near the stirring rod 46, and a rubber strip 54 is connected inside the extension seat 53. The outer wall of the rubber strip 54 is fixedly connected to the outer wall of the hollow drill rod 37, and the rubber strip 54 is distributed at equal angles. An extension strip 55 is fixedly connected to one side of the bottom end of the base 50, and a limiting groove 56 corresponding to the extension strip 55 is provided on the other side of the bottom end of the base 50.

[0061] In practice, the base 50 is first moved to align with the slot 49 on the outer wall of the hollow drill rod 37. At this time, the extension strip 55 at the bottom of one set of bases 50 is inserted into the limiting slot 56 at the bottom of another set of bases 50. Then, the screw is rotated to lock the base 50, so that the bases 50 are assembled into a circle. Then, the threaded pin 52 is rotated to align the base 50 with the outer wall of the hollow drill rod 37, thereby restricting the base 50 to prevent it from rotating axially.

[0062] The operator can also rotate the threaded pin 52 to release the axial lock on the base 50. Then, rotate the base 50 to drive the stirring rod 46 and the extension seat 53 to rotate together, so that the extension seat 53 is disengaged from the rubber strip 54 inside it and moves to the vicinity of the next set of rubber strips 54 to squeeze it until the rubber strip 54 enters the interior of the extension seat 53. The resistance of the above operation will indicate to the operator that the base 50 in the spliced ​​state has been rotated 90 degrees. Then, rotate the threaded pin 52 to lock the base 50, thereby adjusting the position of the stirring rod 46 so that the stirring rod 46 can be staggered on the outer wall of the hollow drill rod 37.

[0063] Then, the nozzle 15 is inserted into the feed inlet on the outer wall of the limiting ring 42 and fixed, so that the nozzle 15 is connected with the feed hole 48. At this time, the cement raw material passes through the hollow drill rod 37, the feed hole 48, the mixing rod 46 and the discharge hole 51 in sequence and is sprayed out, so that the cement raw material enters the reserved hole inside the model box 22, and the preparation of the mixing pile is completed.

[0064] In the remaining embodiments, see [reference]. Figure 17 The nozzle 47 is available in three types: inclined downward, horizontal on the side, and inclined upward. By changing the spray direction of the nozzle 47 on the stirring rod 46, the hollow drill rod 37 can perform diffusion swirl spraying and vertical convection swirl spraying.

[0065] The first embodiment of the stirring rod 46 is as follows.

[0066] refer to Figure 18 The mixing rods 46 are configured with five sets. The nozzles 47 on the bottom set of mixing rods 46 are angled upwards and to the left, away from the hollow drill rods 37. The nozzles 47 on the middle set of mixing rods 46 are horizontally distributed to the side. The nozzles 47 on the top two sets of mixing rods 46 are angled downwards and to the right, closer to the hollow drill rods 37. Thus, the direction of the sprayed cement is as follows: Figure 18 As shown by the middle arrow, the cement sprayed by the five sets of mixing rods 46 will form convection from bottom to top and then from top to bottom, thereby effectively improving the cement mixing effect and eliminating air bubbles in the cement.

[0067] The second implementation method of the stirring rod 46 is as follows.

[0068] refer to Figure 19 As shown, the mixing rods 46 are arranged in five sets. The two sets of spray holes 47 on the bottom two sets of mixing rods 46 are inclined to the upper right, away from the hollow drill rods 37. The spray holes 47 on the middle set of mixing rods 46 are horizontally distributed to the side. The two sets of spray holes 47 on the top two sets of mixing rods 46 are inclined to the upper left, away from the hollow drill rods 37. Thus, the direction of the sprayed cement is as follows: Figure 19 As shown by the middle arrow, the overall structure is in a diffused state, which can effectively improve the uniformity and efficiency of cement jet spraying and effectively prevent the nozzles 47 from clogging.

[0069] In summary, by quickly adjusting the angle of the stirring rod 46 and selecting different combinations of nozzles 47, a single device can simulate multiple construction processes according to construction needs, meeting different scientific research and experimental requirements and improving the flexibility of use.

[0070] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. The substitutions may be replacements of some structures, devices, or method steps, or they may be complete technical solutions. Equivalent substitutions or modifications made to the technical solutions and inventive concepts of the present invention should all be covered within the scope of protection of the present invention.

Claims

1. A constant temperature curing and loading integrated test device for preparing mixing piles, comprising a refrigerator (1), a constant temperature device (2), a loading device (3), and a multi-angle mixing pile preparation device (4), wherein the constant temperature device (2) is connected to one side of the refrigerator (1), and the loading device (3) is connected to the other side of the refrigerator (1), and the multi-angle mixing pile preparation device (4) is provided on both sides of the loading device (3), characterized in that: The refrigerator (1) has a first partition (5) installed in the middle, and an air outlet (7) is provided on one side of the bottom end of the first partition (5), and an air inlet (10) is provided on the other side of the bottom end of the first partition (5). A temperature sensor (9) is connected in the middle of the first partition (5). A relay (6) and a thermostat (8) are installed in sequence on one side of the inner wall of the refrigerator (1). An air heater (11) is installed on the side of the first partition (5) near the air inlet (10). Inside the refrigerator (1), near the side of the multi-angle mixing pile preparation device (4), a reaction frame body (20) is installed. The reaction frame body (20) includes a reaction frame upper plate (16), a reaction frame lower plate (23) and a column (25). A model box (22) is connected to the top center of the reaction frame lower plate (23), and a pressure plate (21) is installed at the top center of the model box (22). A hydraulic jack (18) is installed at the top center of the pressure plate (21), and a force gauge (17) is installed on the top of the hydraulic jack (18). The force gauge (17) is connected to the bottom of the reaction frame upper plate (16). The multi-angle mixing pile preparation device (4) includes a hollow drill rod (37), and the outer wall of the hollow drill rod (37) is provided with multiple sets of detachable mixing rods (46), and the outer wall of the mixing rod (46) is provided with spray holes (47). The spray holes (47) are of three types: inclined downward, horizontal side and inclined upward. By changing the spray direction of the spray holes (47) on the mixing rod (46), the diffusion swirl spraying operation and the upper and lower convection swirl spraying operation of the hollow drill rod (37) can be realized.

2. The test apparatus according to claim 1, wherein the test apparatus is characterized by comprising: a temperature control device that controls the temperature of the mixing pile; and a curing device that controls the temperature of the mixing pile. The top of the reaction frame body (20) is the upper plate (16) of the reaction frame, and the top of the reaction frame body (20) is the lower plate (23) of the reaction frame. The top edge of the lower plate (23) of the reaction frame is connected to a column (25). The hydraulic jack (18) is provided with displacement gauges (19) on both sides of its outer wall, and the bottom of the displacement gauges (19) is connected to the pressure plate (21).

3. The test apparatus according to claim 2, wherein The air heater (11) is provided with a second partition (12) on the outside, and one side of the outer wall of the second partition (12) is connected to the inner wall of the refrigerator (1). An axial flow fan (13) is installed in the middle of the outer wall of the second partition (12).

4. The test apparatus according to claim 3, wherein the test apparatus is characterized by comprising: a temperature control device for controlling the temperature of the mixing pile; and a temperature sensor for measuring the temperature of the mixing pile. Bolt holes (24) are provided on the upper edges of both sides of the model box (22), and the bolt holes (24) are connected to the base (31) by the first bolt (34), and the top of the base (31) is connected to the first motor (26) by the third bolt (39). A first steel plate (33) is welded to one side of the top of the base (31), and a second steel plate (27) is welded to the other side of the top of the base (31).

5. The test apparatus according to claim 4, wherein the test apparatus is characterized by comprising: a temperature control device for controlling the temperature of the mixing pile; and a temperature sensor for measuring the temperature of the mixing pile. The first motor (26) output end is provided with a first coupling (40), the first coupling (40) is internally connected with a lead screw (32), and the outer wall of the lead screw (32) is threadedly connected with a sliding block (28), one side of the inside of the sliding block (28) is provided with a hole (29) with a thread, and the other side of the inside of the sliding block (28) is provided with a first hole (36), and the first hole (36) is slidably connected with a sliding rail (30).

6. The test apparatus according to claim 5, wherein the test apparatus is characterized by comprising: a temperature control device for controlling the temperature of the mixing pile; and a temperature sensor for measuring the temperature of the mixing pile. The top end of the sliding block (28) is connected with a second motor (35) through a fourth bolt (41), and the output end of the second motor (35) is connected with a hollow drill rod (37), the outer wall of the hollow drill rod (37) is rotatably connected with a limiting ring (42), and the side close to the hollow drill rod (37) of the hollow drill rod (37) is provided with equally spaced feed holes (48), the outer wall of the hollow drill rod (37) is connected with a nozzle (15), one side of the outer wall of the nozzle (15) is connected with a cement pump (14), and the second steel plate (27) is internally provided with a second hole (38) corresponding to the hollow drill rod (37).

7. The test apparatus according to claim 6, wherein the test apparatus is characterized by comprising: a temperature control device for controlling the temperature of the mixing pile; and a temperature sensor for measuring the temperature of the mixing pile. The bottom of the base (31) is a mounting seat, and the top end of the mounting seat is connected with a scale plate (44), the base (31) and the mounting seat are connected through a second bolt (45), the outer wall of the scale plate (44) is slidably connected with a pointer (43), and the pointer (43) is fixedly connected with the base (31).

8. The test apparatus according to claim 7, wherein the test apparatus is characterized by comprising: a temperature control device for controlling the temperature of the mixing pile; and a temperature sensor for measuring the temperature of the mixing pile. The outer wall of the hollow drill rod (37) is provided with equally spaced clamping grooves (49), the clamping grooves (49) are internally connected with a base (50), and the base (50) is a "U" type structure, the side close to the clamping grooves (49) of the hollow drill rod (37) is provided with a discharge hole (51), and the discharge hole (51) is equally angularly distributed, and the outer wall of the base (50) is connected with a stirring rod (46).

9. The test apparatus according to claim 8, wherein the test apparatus is characterized by comprising: a temperature control device for controlling the temperature of the mixing pile; and a curing device for curing the mixing pile. The inside of the stirring rod (46) is provided with a feeding groove, the discharge hole (51), the injection hole (47) and the feeding groove constitute a feeding channel, the inner walls of the two sides of the outer wall of the base (50) are threadedly connected with threaded pins (52), and the outer wall of the hollow drill rod (37) is provided with threaded holes corresponding to the threaded pins (52), and the threaded holes are equally angularly distributed in the clamping grooves (49).

10. The test apparatus according to claim 9, wherein the test apparatus is characterized by comprising: a temperature control device for controlling the temperature of the mixing pile; and a temperature sensor for measuring the temperature of the mixing pile. The side close to the stirring rod (46) of the base (50) is fixedly connected with an extension seat (53), the inside of the extension seat (53) is connected with a rubber strip (54), the outer wall of the rubber strip (54) is fixedly connected with the outer wall of the hollow drill rod (37), and the rubber strip (54) is equally angularly distributed, the bottom end of the base (50) is fixedly connected with an extension strip (55), and the other side of the bottom end of the base (50) is provided with a limiting groove (56) corresponding to the extension strip (55).

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