A highway foundation solidification device and its solidification process
By designing a multi-stage nozzle and pressure plate for in-situ curing of highway subgrade, the problem of insufficient spraying distance of cement slurry in the soil layer was solved, achieving efficient curing of the soil layer and improving construction quality and efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- ZHEJIANG HONGTU TRANSPORTATION CONSTR CO LTD
- Filing Date
- 2023-05-09
- Publication Date
- 2026-06-12
AI Technical Summary
In highway foundation construction, insufficient spraying distance of cement grout into the soil layer leads to uneven mixing at deeper levels, affecting the quality of soil solidification.
A highway subgrade in-situ curing device is adopted, including an excavator, a mixing mechanism, a grouting mechanism, a spraying mechanism, a feeding mechanism, a pressurizing mechanism, a bearing mechanism, and a lubrication mechanism. Through the design of multi-stage nozzles and pressurizing plates, the spraying distance and mixing uniformity of cement slurry are improved.
It increases the spraying distance and mixing uniformity of cement slurry in the soil layer, enhances the soil layer's solidification effect, and reduces construction time and costs.
Smart Images
Figure CN116695508B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of highway foundation solidification technology, and in particular to a highway foundation in-situ solidification device and its solidification process. Background Technology
[0002] During highway construction, some topsoil layers are weak, and construction machinery may sink. The fill soil clearly does not meet the strength requirements for roadbed construction and needs to be replaced. However, there is no land available for the excavated fill soil, and using roadbed fill increases construction costs. Therefore, a solidification technology is adopted to solidify the surface in situ. In-situ cement slurry mixing and solidification significantly improves the strength and uniformity of the fill soil. This allows the soft surface soil to quickly form a hard crust, strengthening the soil's integrity, ensuring the foundation's bearing capacity, preventing secondary pollution, and reducing the use of high-quality fill materials. This maximizes social and environmental benefits, realizes the concept of green transportation construction, and saves on project costs.
[0003] When using a mixing head to mix cement slurry into soil, as the mixing head penetrates deeper into the soil layer, the resistance to the movement of the mixing head and cement slurry in the soil layer increases, resulting in a shorter spray distance of cement slurry in the deeper soil layer. This requires increasing the mixing time of the mixing head in the deeper soil layer, and it is easy to cause uneven mixing of cement slurry and soil in the deeper soil layer, which reduces the quality of soil solidification.
[0004] Therefore, it is necessary to provide a new in-situ curing device for highway subgrades and its curing process to solve the above-mentioned technical problems. Summary of the Invention
[0005] The technical problem solved by this invention is to provide a highway subgrade in-situ curing device and its curing process that increases the spraying distance of cement slurry in the soil layer and improves the soil layer curing effect.
[0006] To solve the above-mentioned technical problems, the present invention provides a highway foundation in-situ solidification device comprising: an excavator; a mixing mechanism fixed to one side of the excavator; a grouting mechanism connected to the side wall of the mixing mechanism; and a spraying mechanism comprising a first feed pipe, a second feed pipe, a rubber ring, a first fixing ring, a second fixing ring, a first nozzle, and a second nozzle. The second fixing ring is symmetrically installed inside the mixing mechanism, and the first fixing ring and the rubber ring are rotatably connected inside the second fixing ring. The rubber ring is installed at the connection between the first fixing ring and the second fixing ring. The side walls of the two first fixing rings are respectively fixedly connected to the first feed pipe and the second feed pipe, and the side walls of the two second fixing rings are respectively equipped with multiple first nozzles and second nozzles. The first feed pipe communicates with the first nozzle, and the second feed pipe communicates with the second nozzle. The system includes: a nozzle; a feeding mechanism connected to the interior of the grouting mechanism; a pressurizing mechanism comprising a first cylinder, a second cylinder, a rotating shaft, a pressurizing plate, a first gear, a second gear, a discharge pipe, and a second motor; the feeding mechanism connecting the first cylinder and the second cylinder, with the discharge pipe connected to the bottom ends of the first and second cylinders respectively; the rotating shaft and the pressurizing plate rotatably connected inside both the first and second cylinders, with a spiral pressurizing plate mounted on the side wall of the rotating shaft; the bottom ends of the two rotating shafts fixedly connected to the first gear and the second gear respectively, with the first gear meshing with the second gear; a second motor installed inside the stirring mechanism, connected to the first gear; a bearing mechanism mounted on the side wall of the stirring mechanism; and a lubrication mechanism connecting the second gear and the bearing mechanism.
[0007] Preferably, the mixing mechanism includes a support column, a mixing head, a first blade, a second blade, a first motor, and a connecting shaft. The support column is installed on one side of the excavator, and the mixing head is inclinedly arranged at the bottom end of the support column. The second fixing ring is symmetrically fixedly connected inside the mixing head. Multiple first blades and second blades are respectively installed on the side wall of the mixing head. The connecting shaft is fixedly installed inside the mixing head, and the first motor is connected to the connecting shaft.
[0008] Preferably, the bearing mechanism includes a fixed sleeve, an outer ring, steel balls, an inner ring, and a sealing ring. The bottom end of the support column is fixedly connected to the fixed sleeve, and the sealing ring is installed at the connection between the fixed sleeve and the stirring head. The inner ring is installed at the top of the stirring head, and the outer ring is installed inside the fixed sleeve. The inner ring and the steel balls are rotatably connected to the outer ring, and the cross-section of the gap between the outer ring and the inner ring has a funnel-shaped structure.
[0009] Preferably, the lubrication mechanism includes a connecting pipe, a rotating rod, an oil drum, and a compression plate. The connecting pipe is symmetrically installed on the side wall of the fixed sleeve, and the connecting pipe is fixed to the bottom end of the oil drum. The bottom end of the second gear is fixedly connected to the rotating rod, and the rotating rod and the compression plate are rotatably connected to the inside of the oil drum, with the compression plate installed at an angle to the bottom end of the rotating rod.
[0010] Preferably, the diameter of the first gear is larger than the diameter of the second gear, and the installation direction of the pressure plate inside the first cylinder is opposite to the installation direction of the pressure plate inside the second cylinder.
[0011] Preferably, the grouting mechanism includes a grouting pipe, a storage tank, a first mounting pipe, and a solenoid valve. The first mounting pipe is installed inside the support column, and the two ends of the grouting pipe are respectively connected to the storage tank and the first mounting pipe.
[0012] Preferably, the feeding mechanism includes a partition, a second mounting pipe, a first connecting pipe, and a second connecting pipe. The second mounting pipe is installed at the bottom end of the grouting pipe, and the partition with inclined sidewalls is installed inside the second mounting pipe. The first connecting pipe and the second connecting pipe are installed at the bottom end of the second mounting pipe. The first connecting pipe is connected to the top end of the first cylinder, and the second connecting pipe is connected to the top end of the second cylinder. The diameter of the first connecting pipe is larger than the diameter of the second connecting pipe.
[0013] Preferably, the first feed pipe is installed at the bottom end of the first mounting pipe, the discharge pipe at the bottom end of the first cylinder is connected to the bottom end of the first mounting pipe, the discharge pipe at the bottom end of the second cylinder is symmetrically connected to the second feed pipe, and the solenoid valve is installed on the side walls of the first mounting pipe, the second mounting pipe, and the discharge pipe respectively.
[0014] Preferably, the sidewall of the first blade has an arc-shaped structure, the height of the first blade gradually increases along the direction from the first nozzle to the second nozzle, the first nozzle and the second nozzle are staggered on the sidewall of the stirring head, the sidewall of the first nozzle is inclined, and the second nozzle is located on one side of the first blade.
[0015] The preferred method for in-situ consolidation of highway subgrade includes the following steps:
[0016] Step 1: Connect the device to an external power source. When soil solidification is required, the excavator operates, driving the support column and the mixing head downwards. Simultaneously, the first motor operates, driving the connecting shaft, the mixing head, the first blade, and the second blade to rotate, causing the mixing head, the first blade, and the second blade to rotate and enter the soil layer. At this time, the grouting mechanism operates, causing cement slurry to pass through the first installation pipe, the first feed pipe, the first fixing ring, and the second fixing ring, and then be sprayed out through the first nozzle. Part of the slurry sprayed from the first nozzle is tangential to the edge of the mixing head, causing the slurry sprayed from the first nozzle to push the mixing head to rotate in the opposite direction, increasing the thrust of the mixing head and facilitating its entry into the soil layer. At the same time, the rotation of the mixing head ensures that the soil layer and cement slurry are mixed evenly. The first nozzle is tilted to increase the spraying area of the cement slurry and improve the contact area between the cement slurry and the soil layer.
[0017] Step Two: As the mixing head continuously penetrates the soil layer, the rotational resistance of the mixing head increases. At this time, the solenoid valve on the side wall of the first mounting pipe closes, and the solenoid valve on the side wall of the second mounting pipe opens. Cement slurry enters the interior of the second mounting pipe and contacts the partition plate. The partition plate diverts the cement slurry, allowing most of it to enter the interior of the first cylinder through the first connecting pipe, and the remaining portion to enter the interior of the second cylinder through the second connecting pipe. The second motor drives the first gear, the second gear, the rotating shaft, and the pressure plate to rotate. The spiral pressure plate rotates, pushing the cement slurry rapidly downwards in the first and second cylinders, increasing the slurry's running speed. After being accelerated through the first cylinder, the cement slurry is rapidly sprayed out through the first nozzle, increasing the spray distance and facilitating contact between the cement slurry and deeper soil layers. Simultaneously, it increases the rotational thrust of the mixing head, ensuring uniform mixing of the cement slurry deep within the soil layer. The diameter of the first gear is larger than that of the second gear, and the rotational speed of the second gear is greater than that of the first gear. The rotational speed of the gears and the rotational speed of the pressure plate inside the second cylinder are greater than the rotational speed of the pressure plate inside the first cylinder, thereby further increasing the running speed of the cement slurry inside the second cylinder. The pressurized cement slurry inside the second cylinder is sprayed out through the second nozzle, which is located on one side of the first blade. The cement slurry sprayed out by the second nozzle runs along the side wall of the first blade, which is arc-shaped. The first blade protects the cement slurry and prevents soil from affecting the sliding of the cement slurry on the side wall of the first blade. The height of the first blade gradually increases from the first nozzle towards the second nozzle. The cement slurry sprayed along the first blade gradually gathers, increasing the impact force of the cement slurry. The cement slurry sprayed from the side wall of the first blade rushes quickly into the soil layer, reducing the rotational resistance of the mixing head and increasing the spraying distance of the cement slurry. At the same time, the cement slurry sliding out from the side wall of the first blade carries the cement slurry sprayed from the first nozzle into the soil layer quickly, so that the cement slurry and the soil layer are quickly and evenly mixed, improving the solidification quality of the soil layer.
[0018] Step 3: The mixing mechanism gradually penetrates deeper to mix and spray cement slurry until it reaches the bottom of the solidification treatment depth. The excavator then drives the mixing mechanism to move upward and spray cement slurry into the soil layer again. During the solidification of the soil layer, the mixing mechanism mixes the soil at each solidification point at least twice to improve the solidification effect.
[0019] Compared with related technologies, the highway subgrade in-situ solidification device and its solidification process provided by the present invention have the following beneficial effects:
[0020] This invention provides a highway subgrade in-situ solidification device and its solidification process. When treating shallow soft soil, cement slurry is sprayed from a first nozzle. The mixing mechanism mixes the cement slurry evenly with the soil. As the mixing mechanism gradually penetrates deeper into the soil layer, its rotational resistance increases. The feeding mechanism allows most of the cement slurry to enter the interior of the first cylinder, while the remaining portion enters the interior of the second cylinder. A second motor drives the first gear, the second gear, the rotating shaft, and the pressure plate to rotate. The spiral pressure plate propels the cement slurry rapidly downwards through the first and second cylinders, increasing its speed. After acceleration through the first cylinder, the cement slurry is rapidly sprayed from the first nozzle, increasing its spray distance and facilitating contact with deeper soil layers. Simultaneously, the rotating thrust of the mixing head is increased, ensuring even mixing of the cement slurry deep within the soil layer. The diameter of the first gear is larger than that of the second gear, and the rotational speed of the second gear is greater than that of the first gear. The rotational speed of the pressure plate inside the second cylinder is greater than that of the pressure plate inside the first cylinder, thereby further increasing the running speed of the cement slurry inside the second cylinder. The pressurized cement slurry inside the second cylinder is sprayed out through the second nozzle, which is located on one side of the first blade. The cement slurry sprayed out by the second nozzle runs along the side wall of the first blade, which is arc-shaped. The first blade protects the cement slurry and prevents soil from affecting its sliding on the side wall. The height of the first blade gradually increases from the first nozzle towards the second nozzle, and the cement slurry sprayed along the first blade gradually converges, increasing the impact force of the cement slurry. The cement slurry sprayed from the side wall of the first blade rushes quickly into the soil layer, reducing the rotational resistance of the mixing head and increasing the spraying distance of the cement slurry. At the same time, the cement slurry sliding out from the side wall of the first blade carries the cement slurry sprayed from the first nozzle into the soil layer quickly, so that the cement slurry and the soil layer are quickly and evenly mixed, improving the solidification quality of the soil layer. Attached Figure Description
[0021] Figure 1 A schematic diagram of the in-situ curing device and curing process for highway subgrade provided by the present invention;
[0022] Figure 2 for Figure 1 The diagram shows the internal structure of the stirring mechanism.
[0023] Figure 3 for Figure 2 The diagram shows an enlarged view of the structure at point A.
[0024] Figure 4 for Figure 2 The diagram shows an enlarged view of the structure at point B.
[0025] Figure 5 for Figure 2 The diagram shows an enlarged view of the structure at point C.
[0026] Figure 6 for Figure 2 The diagram shows a view of the stirring head structure.
[0027] Figure 7 A schematic diagram of the circuit structure provided by the present invention.
[0028] Numbered in the diagram: 1. Excavator; 2. Grouting mechanism; 21. Grouting pipe; 22. Storage tank; 23. First feed pipe; 24. Solenoid valve; 3. Mixing mechanism; 31. Support column; 32. Mixing head; 33. First blade; 34. Second blade; 35. First motor; 36. Connecting shaft; 4. Spraying mechanism; 41. First feed pipe; 42. Second feed pipe; 43. Rubber ring; 44. First fixing ring; 45. Second fixing ring; 46. First nozzle; 47. Second nozzle; 5. Bearing mechanism; 51. 52. Fixed sleeve, outer ring, 53. Steel ball, 54. Inner ring, 55. Sealing ring, 6. Feeding mechanism, 61. Partition plate, 62. Second feed pipe, 63. First connecting pipe, 64. Second connecting pipe, 7. Pressurizing mechanism, 71. First cylinder, 72. Second cylinder, 73. Rotating shaft, 74. Pressurizing plate, 75. First gear, 76. Second gear, 77. Discharge pipe, 78. Second motor, 8. Lubrication mechanism, 81. Connecting pipe, 82. Rotating rod, 83. Oil drum, 84. Compression plate, 9. Resistance sensor. Detailed Implementation
[0029] The present invention will be further described below with reference to the accompanying drawings and embodiments. Figure 1 A schematic diagram of the in-situ curing device and curing process for highway subgrade provided by the present invention; Figure 2 for Figure 1 The diagram shows the internal structure of the stirring mechanism. Figure 3 for Figure 2 The diagram shows an enlarged view of the structure at point A. Figure 4 for Figure 2 The diagram shows an enlarged view of the structure at point B. Figure 5 for Figure 2 The diagram shows an enlarged view of the structure at point C. Figure 6 for Figure 2 The diagram shows a view of the stirring head structure. Figure 7A schematic diagram of the circuit structure provided by the present invention. The highway subgrade in-situ consolidation device includes: an excavator 1; a mixing mechanism 3, which is fixed to one side of the excavator 1; a grouting mechanism 2, which is connected to the side wall of the mixing mechanism 3; a spraying mechanism 4, which includes a first feed pipe 41, a second feed pipe 42, a rubber ring 43, a first fixing ring 44, a second fixing ring 45, a first nozzle 46, and a second nozzle 47. The second fixing ring 45 is symmetrically installed inside the mixing mechanism 3. The first fixing ring 44 and the rubber ring 43 are rotatably connected inside the second fixing ring 45. The rubber ring 43 is installed at the connection between the first fixing ring 44 and the second fixing ring 45. The side walls of the two first fixing rings 44 are respectively fixedly connected to the first feed pipe 41 and the second feed pipe 42, and the side walls of the two second fixing rings 45 are respectively equipped with multiple first nozzles 46 and second nozzles 47. The first feed pipe 41 is connected to the first nozzle 46, and the second feed pipe 42 is connected to the second nozzle 47. A feeding mechanism 6 is also included. Mechanism 6 connects to the interior of the grouting mechanism 2; Pressure boosting mechanism 7 includes a first cylinder 71, a second cylinder 72, a rotating shaft 73, a pressure boosting plate 74, a first gear 75, a second gear 76, a discharge pipe 77, and a second motor 78. The feeding mechanism 6 connects the first cylinder 71 and the second cylinder 72, and the discharge pipe 77 is respectively connected to the bottom ends of the first cylinder 71 and the second cylinder 72; the rotating shaft 73 and the pressure boosting plate are rotatably connected inside both the first cylinder 71 and the second cylinder 72. The pressure plate 74 is mounted on the side wall of the rotating shaft 73 in a spiral shape; the bottom ends of the two rotating shafts 73 are respectively fixedly connected to the first gear 75 and the second gear 76, and the first gear 75 meshes with the second gear 76; the second motor 78 is installed inside the stirring mechanism 3 and is connected to the first gear 75; the bearing mechanism 5 is mounted on the side wall of the stirring mechanism 3; the lubrication mechanism 8 is connected to the second gear 76 and the bearing mechanism 5.
[0030] The mixing mechanism 3 includes a support column 31, a mixing head 32, a first blade 33, a second blade 34, a first motor 35, and a connecting shaft 36. The support column 31 is installed on one side of the excavator 1. The mixing head 32 is inclinedly arranged at the bottom end of the support column 31. The second fixing ring 45 is symmetrically fixedly connected inside the mixing head 32. Multiple first blades 33 and second blades 34 are respectively installed on the side wall of the mixing head 32. The connecting shaft 36 is fixedly installed inside the mixing head 32, and the first motor 35 is connected to the connecting shaft 36. When the first motor 35 operates, it pushes the connecting shaft 36, the mixing head 32, the first blade 33, and the second blade 34 to rotate counterclockwise (as shown in the attached diagram). Figure 2 As shown), the first blade 33 and the second blade 34 rotate to cut the soil, making it easier for the mixing head 32 to enter the soil layer.
[0031] The bearing mechanism 5 includes a fixed sleeve 51, an outer ring 52, steel balls 53, an inner ring 54, and a sealing ring 55. The bottom end of the support column 31 is fixedly connected to the fixed sleeve 51, and the sealing ring 55 is installed at the connection between the fixed sleeve 51 and the stirring head 32. The top end of the stirring head 32 is equipped with the inner ring 54, and the outer ring 52 is installed inside the fixed sleeve 51. The inner ring 54 and the steel balls 53 are rotatably connected to the outer ring 52. The lubrication mechanism 8 includes a connecting pipe 81 and a rotating... The structure consists of a rod 82, an oil drum 83, and a compression plate 84. A connecting pipe 81 is symmetrically installed on the side wall of the fixing sleeve 51, and the connecting pipe 81 is fixed to the bottom end of the oil drum 83. The bottom end of the second gear 76 is fixedly connected to the rotating rod 82. The rotating rod 82 and the compression plate 84 are rotatably connected inside the oil drum 83, and the bottom end of the compression plate 84 is inclined at the bottom end of the rotating rod 82. When the stirring head 32 rotates, it drives the inner ring 54 and the steel balls 53 to rotate. The outer ring 52 rotates internally, and the fixing sleeve 51 fixes the outer ring 52, thereby fixing one end of the stirring head 32 inside the fixing sleeve 51. The sealing ring 55 prevents soil from entering the interior of the fixing sleeve 51. When the second gear 76 rotates, the second gear 76 pushes the rotating rod 82 and the compression plate 84 to rotate inside the oil drum 83. The inclined spiral compression plate 84 squeezes the lubricating oil inside the oil drum 83, so that the lubricating oil enters between the outer ring 52 and the inner ring 54 through the connecting pipe 1, reducing the resistance of the rotation of the inner ring 54. At the same time, the lubricating oil sprayed from the connecting pipe 81 moves towards the sealing ring 55, pushing the lubricating oil between the inner ring 54 and the outer ring 52 outward. Meanwhile, the cross-section of the gap between the outer ring 52 and the inner ring 54 is funnel-shaped, which facilitates the outward movement of the lubricating oil, presses out the impurities between the outer ring 52 and the inner ring 54, and prevents debris from entering between the inner ring 54 and the outer ring 52.
[0032] The diameter of the first gear 75 is larger than the diameter of the second gear 76. To increase the flow rate of the cement slurry inside the second cylinder 72, and with the installation direction of the pressure plate 74 inside the first cylinder 71 opposite to that inside the second cylinder 72, the pressure plate 74 at the temporal portion of the first cylinder 71 rotates clockwise, and the pressure plate 74 inside the second cylinder 72 rotates counterclockwise (as shown in the attached diagram). Figure 2 As shown in the figure, in order to facilitate the rapid downward movement of cement slurry when the pressure plate 74 rotates.
[0033] The grouting mechanism 2 includes a grouting pipe 21, a storage tank 22, a first mounting pipe 23, and a solenoid valve 24. The first mounting pipe 23 is installed inside the support column 31. The two ends of the grouting pipe 21 are connected to the storage tank 22 and the first mounting pipe 23, respectively, so that the cement slurry inside the storage tank 22 can enter the interior of the first mounting pipe 23 through the grouting pipe 21.
[0034] The feeding mechanism 6 includes a partition 61, a second mounting pipe 62, a first connecting pipe 63, and a second connecting pipe 64. The second mounting pipe 62 is installed at the bottom end of the grouting pipe 21, and the partition 61 with its inclined sidewalls is installed inside the second mounting pipe 62. The first connecting pipe 63 and the second connecting pipe 64 are installed at the bottom end of the second mounting pipe 62. The first connecting pipe 63 is connected to the top end of the first cylinder 71, and the second connecting pipe 64 is connected to the top end of the second cylinder 72. The diameter of the first connecting pipe 63 is larger than the diameter of the second connecting pipe 64. To allow the cement slurry to contact the partition 61 when it enters the interior of the second mounting pipe 62, the partition 61 diverts the cement slurry, allowing most of the cement slurry to enter the interior of the first cylinder 71 through the first connecting pipe 63, and the remaining portion of the cement slurry to enter the interior of the second cylinder 72 through the second connecting pipe 64.
[0035] The first feed pipe 41 is installed at the bottom end of the first mounting pipe 23. The discharge pipe 77 at the bottom end of the first cylinder 71 is connected to the bottom end of the first mounting pipe 23. The discharge pipe 77 at the bottom end of the second cylinder 72 is symmetrically connected to the second feed pipe 42. In order to facilitate the cement slurry inside the first cylinder 71 to be sprayed out through the first nozzle 46, and the cement slurry inside the second cylinder 72 to be sprayed out through the second nozzle 47, the solenoid valve 24 is installed on the side walls of the first mounting pipe 23, the second mounting pipe 62, and the discharge pipe 77, so that the solenoid valve 24 can control the opening and closing of the first mounting pipe 23, the second mounting pipe 62, and the discharge pipe 77.
[0036] The sidewall of the first blade 33 has an arc-shaped structure. The height of the first blade 33 gradually increases along the direction of the first nozzle 46 toward the second nozzle 47. The first nozzle 46 and the second nozzle 47 are staggered on the sidewall of the mixing head 32. The sidewall of the first nozzle 46 is inclined, and the second nozzle 47 is located on one side of the first blade 33. In order to facilitate the movement of cement slurry sprayed from the second nozzle 47 along the sidewall of the first blade 33, i.e., to prevent soil from blocking the movement of cement slurry, and at the same time to allow the cement slurry to gradually accumulate, increase the impact force of the cement slurry on the soil, and increase the spraying area of the cement slurry.
[0037] A highway subgrade in-situ consolidation process includes the following steps:
[0038] Step 1: Connect the device to an external power source. When soil solidification is required, the excavator 1 operates, driving the support column 31 and the mixing head 32 downwards. The movement speed of the mixing head 32 is controlled between 0.1 m / s and 0.3 m / s. The industrial control computer activates the first motor 35, which simultaneously drives the connecting shaft 36, the mixing head 32, the first blade 33, and the second blade 34 to rotate, causing the mixing head 32, the first blade 33, and the second blade 34 to rotate into the soil. The industrial control computer then activates the cement pump inside the storage tank 22, transporting the cement slurry from the storage tank 22 into the first installation pipe 23. Simultaneously, the cement pump ensures that the maximum pressure of the cement slurry running inside the first installation pipe 23 is not less than 3 kJ / s. MPa; Cement slurry passes through the first installation pipe 23, the first feed pipe 41, the first fixing ring 44, and the second fixing ring 45, and is then sprayed out through the first nozzle 46. The mixing head 32 drives the second fixing ring 45 to rotate, while the first fixing ring 44 does not rotate inside the mixing head 32. The rubber ring 43 increases the sealing at the connection between the first fixing ring 44 and the second fixing ring 45 to prevent slurry leakage. When the cement slurry is sprayed out, some of the mortar sprayed from the first nozzle 46 is tangential to the edge of the mixing head 32, causing the mortar sprayed from the first nozzle 46 to push the mixing head 32 to rotate in the opposite direction, increasing the thrust of the mixing head 32 and facilitating its entry into the soil layer. Simultaneously, the mixing head 32 rotates to ensure uniform mixing of the soil layer and cement slurry; the first nozzle 46 is tilted to increase the spraying area of the cement slurry and improve the contact area between the cement slurry and the soil layer; when the mixing head 32 is operating, the pressure sensor 9 monitors the resistance encountered by the mixing head 32 during rotation, the speed sensor monitors the rotational speed of the mixing head 32 in the soil layer, the displacement sensor monitors the depth of the mixing head 32 in the soil layer, and the flow sensor monitors the volume of cement slurry entering the soil layer; the sensors transmit the monitored data to the information acquisition module in the industrial control computer, and the central processing unit in the industrial control computer processes the information and adjusts the rotation thrust of the mixing head 32 and the spraying area of the cement slurry in a timely manner to improve the effect of cement slurry solidifying the soil layer;
[0039] Step Two: As the mixing head 32 continuously enters the soil layer, the rotational resistance of the mixing head 32 exceeds 10 MPa. At this time, the solenoid valve 24 on the side wall of the first installation pipe 23 closes and opens. The solenoid valves 24 on the side walls of the second installation pipe 23 and the treatment pipe 77 open, allowing cement slurry to enter the interior of the second installation pipe 62 and contact the partition plate 61. The partition plate 61 diverts the cement slurry, allowing most of the cement slurry to enter the interior of the first cylinder 71 through the first connecting pipe 63, and the remaining cement slurry to enter the interior of the second cylinder 72 through the second connecting pipe 64. The motor 78 drives the first gear 75, the second gear 76, the rotating shaft 73, and the pressure plate 74 to rotate. The spiral pressure plate 74 rotates, pushing the cement slurry rapidly downwards in the first cylinder 71 and the second cylinder 72, increasing the running speed of the cement slurry. After being accelerated by the first cylinder 71, the cement slurry is rapidly sprayed out through the first nozzle 46, increasing the spraying distance of the cement slurry and facilitating contact between the cement slurry and the deep soil layer. At the same time, it increases the rotational thrust of the mixing head 32, making the cement slurry evenly mixed deep in the soil layer. The diameter of the first gear 75 is larger than the diameter of the second gear 76. The rotational speed of the second gear 76 is greater than that of the first gear 75, and the rotational speed of the pressure plate 74 inside the second cylinder 72 is greater than that of the pressure plate 74 inside the first cylinder 71, thereby further increasing the running speed of the cement slurry inside the second cylinder 72. The pressurized cement slurry inside the second cylinder 72 is sprayed out through the second nozzle 47, which is located on one side of the first blade 33. Thus, the cement slurry sprayed from the second nozzle 47 runs along the side wall of the first blade 33, which is arc-shaped, protecting the cement slurry and preventing it from moving away from the side wall. The cement slurry slides smoothly on the side wall of the first blade 33 without the influence of soil. The height of the first blade 33 gradually increases along the direction from the first nozzle 46 to the second nozzle 47. The cement slurry sprayed along the first blade 33 gradually gathers, increasing the impact force of the cement slurry. The cement slurry sprayed from the side wall of the first blade 33 quickly rushes into the soil layer, reducing the rotational resistance of the mixing head 32 and increasing the spraying distance of the cement slurry. At the same time, the cement slurry sliding out from the side wall of the first blade 33 carries the cement slurry sprayed from the first nozzle 46 into the soil layer quickly, so that the cement slurry and the soil layer are quickly and evenly mixed, improving the solidification quality of the soil layer.
[0040] When the stirring head 32 rotates, it drives the inner ring 54 and the steel ball 53 to rotate inside the outer ring 52. The fixing sleeve 51 fixes the outer ring 52, thereby fixing one end of the stirring head 32 inside the fixing sleeve 51. The sealing ring 55 prevents soil from entering the interior of the fixing sleeve 51. As the stirring head 32 extends into the soil layer, the pressure of the soil layer on the sealing ring 55 gradually increases, and some impurities pass through the sealing ring 55 and enter between the outer ring 52 and the inner ring 54. When the second gear 76 rotates, it pushes the rotating rod 82 and the compression plate 84 to rotate inside the oil drum 83, tilting... The inclined spiral-shaped compression plate 84 squeezes the lubricating oil inside the oil tank 83, causing the lubricating oil to enter between the outer ring 52 and the inner ring 54 through the connecting pipe 1, reducing the rotational resistance of the inner ring 54. At the same time, the lubricating oil sprayed from the connecting pipe 81 moves towards the sealing ring 55, pushing the lubricating oil between the inner ring 54 and the outer ring 52 outward. Meanwhile, the cross-section of the gap between the outer ring 52 and the inner ring 54 has a funnel-shaped structure, which facilitates the outward movement of the lubricating oil, presses out impurities between the outer ring 52 and the inner ring 54, and prevents impurities from entering between the inner ring 54 and the outer ring 52, further reducing the rotational resistance of the stirring head 32.
[0041] Step 3: The excavator 1 drives the mixing head 32 to gradually penetrate deeper into the soil and spray cement slurry until the bottom of the solidification treatment depth is reached. The excavator 1 then drives the mixing head 32 to move upward and spray cement slurry into the soil layer again. During the solidification of the soil layer, the mixing head 32 mixes the soil at each solidification point at least twice to improve the solidification effect.
[0042] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.
Claims
1. A highway subgrade in-situ solidification device, characterized in that, include: Excavator (1); A mixing mechanism (3) is fixed to one side of the excavator (1); Grouting mechanism (2), the grouting mechanism (2) is connected to the side wall of the mixing mechanism (3); The spraying mechanism (4) includes a first feed pipe (41), a second feed pipe (42), a rubber ring (43), a first fixing ring (44), a second fixing ring (45), a first nozzle (46), and a second nozzle (47). The second fixing ring (45) is symmetrically installed inside the stirring mechanism (3). The first fixing ring (44) and the rubber ring (43) are rotatably connected inside the second fixing ring (45). The rubber ring (43) is installed at the connection between the first fixing ring (44) and the second fixing ring (45). The side walls of the two first fixing rings (44) are respectively fixedly connected to the first feed pipe (41) and the second feed pipe (42). The side walls of the two second fixing rings (45) are respectively equipped with multiple first nozzles (46) and second nozzles (47). The first feed pipe (41) is connected to the first nozzle (46), and the second feed pipe (42) is connected to the second nozzle (47). Feeding mechanism (6), the feeding mechanism (6) is connected to the interior of the grouting mechanism (2); A pressurizing mechanism (7) includes a first cylinder (71), a second cylinder (72), a rotating shaft (73), a pressurizing plate (74), a first gear (75), a second gear (76), a discharge pipe (77), and a second motor (78). A feeding mechanism (6) connects the first cylinder (71) and the second cylinder (72). The discharge pipe (77) is connected to the bottom ends of the first cylinder (71) and the second cylinder (72), respectively. The rotating shaft (73) and the pressurizing plate (74) are rotatably connected inside both the first cylinder (71) and the second cylinder (72). The sidewall is fitted with a spiral-shaped pressure plate (74); the bottom ends of the two rotating shafts (73) are respectively fixedly connected to the first gear (75) and the second gear (76), and the first gear (75) meshes with the second gear (76); the stirring mechanism (3) is fitted with a second motor (78), which is connected to the first gear (75); the diameter of the first gear (75) is larger than the diameter of the second gear (76), and the installation direction of the pressure plate (74) inside the first cylinder (71) is opposite to the installation direction of the pressure plate (74) inside the second cylinder (72); Bearing mechanism (5), the bearing mechanism (5) is installed on the side wall of the stirring mechanism (3); The lubrication mechanism (8) connects the second gear (76) and the bearing mechanism (5). The lubrication mechanism (8) includes a connecting pipe (81), a rotating rod (82), an oil drum (83), and a compression plate (84). The connecting pipe (81) is symmetrically installed on the side wall of the fixing sleeve (51). The connecting pipe (81) is fixed to the bottom end of the oil drum (83). The bottom end of the second gear (76) is fixedly connected to the rotating rod (82). The rotating rod (82) and the compression plate (84) are rotatably connected to the inside of the oil drum (83), and the bottom end of the compression plate (84) is inclined to the bottom end of the rotating rod (82).
2. The highway subgrade in-situ solidification device according to claim 1, characterized in that, The mixing mechanism (3) includes a support column (31), a mixing head (32), a first blade (33), a second blade (34), a first motor (35), and a connecting shaft (36). The support column (31) is installed on one side of the excavator (1). The mixing head (32) is inclined at the bottom end of the support column (31). The second fixing ring (45) is symmetrically fixed inside the mixing head (32). Multiple first blades (33) and second blades (34) are respectively installed on the side wall of the mixing head (32). The connecting shaft (36) is fixedly installed inside the mixing head (32), and the first motor (35) is connected to the connecting shaft (36).
3. The highway subgrade in-situ solidification device according to claim 2, characterized in that, The bearing mechanism (5) includes a fixed sleeve (51), an outer ring (52), a steel ball (53), an inner ring (54), and a sealing ring (55). The bottom end of the support column (31) is fixedly connected to the fixed sleeve (51), and the sealing ring (55) is installed at the connection between the fixed sleeve (51) and the stirring head (32). The inner ring (54) is installed at the top of the stirring head (32), and the outer ring (52) is installed inside the fixed sleeve (51). The inner ring (54) and the steel ball (53) are rotatably connected to the outer ring (52). The cross-section of the gap between the outer ring (52) and the inner ring (54) is funnel-shaped.
4. The highway subgrade in-situ solidification device according to claim 2, characterized in that, The grouting mechanism (2) includes a grouting pipe (21), a storage tank (22), a first mounting pipe (23) and a solenoid valve (24). The first mounting pipe (23) is installed inside the support column (31). The two ends of the grouting pipe (21) are connected to the storage tank (22) and the first mounting pipe (23) respectively.
5. The highway subgrade in-situ solidification device according to claim 4, characterized in that, The feeding mechanism (6) includes a partition (61), a second mounting pipe (62), a first connecting pipe (63), and a second connecting pipe (64). The second mounting pipe (62) is installed at the bottom end of the grouting pipe (21). The partition (61) with its sidewall inclined is installed inside the second mounting pipe (62). The first connecting pipe (63) and the second connecting pipe (64) are installed at the bottom end of the second mounting pipe (62). The first connecting pipe (63) is connected to the top end of the first cylinder (71), and the second connecting pipe (64) is connected to the top end of the second cylinder (72). The diameter of the first connecting pipe (63) is larger than the diameter of the second connecting pipe (64).
6. The highway subgrade in-situ solidification device according to claim 5, characterized in that, The first feed pipe (41) is installed at the bottom end of the first mounting pipe (23), the discharge pipe (77) at the bottom end of the first cylinder (71) is connected to the bottom end of the first mounting pipe (23), the discharge pipe (77) at the bottom end of the second cylinder (72) is symmetrically connected to the second feed pipe (42), and the solenoid valve (24) is installed on the side walls of the first mounting pipe (23), the second mounting pipe (62), and the discharge pipe (77).
7. The highway subgrade in-situ solidification device according to claim 2, characterized in that, The sidewall of the first blade (33) has an arc-shaped structure. The height of the first blade (33) gradually increases along the direction of the first nozzle (46) toward the second nozzle (47). The first nozzle (46) and the second nozzle (47) are staggered on the sidewall of the stirring head (32). The sidewall of the first nozzle (46) is inclined, and the second nozzle (47) is located on one side of the first blade (33).
8. The curing process of the highway subgrade in-situ curing device according to any one of claims 1-7, characterized in that, Includes the following steps: Step 1: Connect the device to an external power source. When soil solidification is required, the excavator (1) operates, driving the support column (31) and the mixing head (32) to move downwards. At the same time, the first motor (35) operates, driving the connecting shaft (36), the mixing head (32), the first blade (33), and the second blade (34) to rotate, causing the mixing head (32), the first blade (33), and the second blade (34) to rotate into the soil. At this time, the grouting mechanism (2) operates, causing the cement slurry to pass through the first installation pipe (23), the first feed pipe (41), and the first fixing ring. (44) and the two fixed rings (45) are sprayed out through the first nozzle (46). Part of the mortar sprayed from the first nozzle (46) is tangential to the edge of the mixing head (32), so that the mortar sprayed from the first nozzle (46) pushes the mixing head (32) to rotate in the opposite direction, increasing the thrust of the mixing head (32) and making it easier for the mixing head (32) to enter the soil layer. At the same time, the rotation of the mixing head (32) makes the soil layer and cement slurry mix evenly. The first nozzle (46) is set at an angle to increase the spraying area of the cement slurry and improve the contact area between the cement slurry and the soil layer. Step 2: As the mixing head (32) continuously enters the soil layer, the rotational resistance of the mixing head (32) increases. At this time, the solenoid valve (24) on the side wall of the first mounting pipe (23) closes, and the solenoid valve (24) on the side wall of the second mounting pipe (62) opens. Cement slurry enters the interior of the second mounting pipe (62) and contacts the partition plate (61). The partition plate (61) diverts the cement slurry, so that most of the cement slurry enters the interior of the first cylinder (71) through the first connecting pipe (63), and the other part of the cement slurry enters the interior of the second cylinder (72) through the second connecting pipe (64). The second motor (78) operates to drive the first gear (75), and the... The second gear (76), the rotating shaft (73), and the pressure plate (74) rotate. The spiral pressure plate (74) rotates, pushing the cement slurry to move rapidly downward in the first cylinder (71) and the second cylinder (72), increasing the running speed of the cement slurry. After being accelerated by the first cylinder (71), the cement slurry is quickly sprayed out through the first nozzle (46), increasing the spraying distance of the cement slurry and facilitating contact between the cement slurry and the deep soil layer. At the same time, it increases the rotational thrust of the mixing head (32), making the cement slurry evenly mixed deep in the soil layer. The diameter of the first gear (75) is larger than the diameter of the second gear (76), and the rotational speed of the second gear (76) is greater than that of the first gear (75). The rotational speed of the first gear (75) and the rotational speed of the pressure plate (74) inside the second cylinder (72) are greater than the rotational speed of the pressure plate (74) inside the first cylinder (71), thereby further increasing the running speed of the cement slurry inside the second cylinder (72). The pressurized cement slurry inside the second cylinder (72) is sprayed out through the second nozzle (47), and the second nozzle (47) is located on one side of the first blade (33). Thus, the cement slurry sprayed out by the second nozzle (47) runs along the side wall of the first blade (33). The side wall of the first blade (33) is arc-shaped, and the first blade (33) protects the cement slurry and avoids... The cement slurry slides on the side wall of the first blade (33) without the influence of soil, and the height of the first blade (33) gradually increases along the direction of the first nozzle (46) towards the second nozzle (47). The cement slurry sprayed along the first blade (33) gradually gathers, increasing the impact force of the cement slurry. The cement slurry sprayed from the side wall of the first blade (33) rushes into the soil layer quickly, reducing the rotation resistance of the mixing head (32) and increasing the spraying distance of the cement slurry. At the same time, the cement slurry sliding out from the side wall of the first blade (33) drives the cement slurry sprayed from the first nozzle (46) to quickly enter the soil layer, so that the cement slurry and the soil layer are quickly and evenly mixed, improving the solidification quality of the soil layer. Step 3: The mixing mechanism (3) gradually deepens the mixing and sprays cement slurry until it reaches the bottom of the solidification treatment depth. The excavator (1) drives the mixing mechanism (3) to move upward and spray cement slurry into the soil layer again. When solidifying the soil layer, the mixing mechanism (3) at each solidification point mixes up and down at least twice to improve the solidification effect.