A two-way in-situ solidification mixing equipment and construction method

Abstract

This invention provides a bidirectional in-situ curing mixing device and construction method, relating to the field of underground construction machinery and equipment technology. The device includes a mounting base plate, an extension arm, at least two mixing heads, a hydraulic system, and a delivery pipeline system. The extension arm connects the mounting base plate to the mixing heads. Multiple mixing heads are evenly and symmetrically arranged at a certain angle at the bottom of the in-situ curing mixing device. The hydraulic system provides power to a hydraulic motor to drive the mixing heads to rotate and mix. The delivery pipeline system is fixedly installed on the side of the bidirectional in-situ curing mixing device structure to provide curing agent powder / slurry and high-pressure gas. The advantages of this invention are that the device achieves a staggered mixing effect of the mixing blades through the bidirectional rotation of two mixing shafts, and monitors and controls the rotation speed of the mixing heads. The delivery pipeline can deliver the curing agent. The nozzle structure and placement allow for more uniform mixing of the curing agent with the in-situ soil, improving construction efficiency and reducing construction costs.

Description

Technical Field

[0001] This invention relates to the field of underground construction machinery and equipment technology, and more specifically, to a two-way in-situ solidification mixing device and construction method. Background Technology

[0002] Shallow solidification technology is a highly efficient foundation treatment method. Its core concept is to add specific solidifying agents at a specific depth and area, and then improve the engineering performance of the soil layer through mechanical mixing. Commonly used solidifying agents such as cement, quicklime, specialized solidifying agents, and fly ash play a crucial role in this process. These solidifying agents can undergo complex physical and chemical reactions with the soil particles, promoting the formation of a strong and stable structure between the soil particles. In this way, the strength and stability of the soil are significantly improved, providing the foundation bearing capacity that meets design requirements for various foundation treatment projects. Furthermore, this foundation treatment technology has advantages such as simple operation, high construction efficiency, and low cost, and therefore has been widely used in engineering practice.

[0003] The following issues need to be addressed during the use of this technology, equipment, and construction method:

[0004] 1. In current applications of mixing equipment, a major challenge is that the mixing blades cannot guarantee a completely uniform mixture of soil and solidification material during the mixing process. Existing mixing equipment typically uses single-layer blades with a simple unidirectional rotation, resulting in insufficient disturbance to the soil during mixing. This makes it difficult to ensure uniform mixing of the soil and solidification material, leading to reinforcement effects that fail to meet design requirements and affecting the uniformity and reliability of the reinforcement results.

[0005] 2. The existing structure and location design of the hardener nozzles have flaws. Hardener nozzles are generally located at the base of the mixing head, using a circular nozzle opening. This results in the hardener not reaching the effective mixing area during spraying, and no corresponding protection is provided. This defect makes the nozzles prone to clogging during mixing operations, causing uneven hardener spraying. Once the nozzles are clogged, the hardener cannot be accurately injected into the ground according to the preset flow rate and velocity, directly affecting the soil solidification effect and posing a potential threat to the overall project construction. Therefore, optimizing the structure and location of the hardener nozzles to ensure smooth operation during mixing operations is an important measure to guarantee the quality of project construction.

[0006] 3. Current mixing construction technology cannot control the number of mixing cycles of the mixing blades in the equipment structure, and existing technologies and equipment cannot accurately measure the real-time rotation speed of the mixing head. This technical deficiency may lead to uneven mixing and uneven spraying of the curing agent during the mixing operation, meaning that the mixing quality of the soil and curing agent is difficult to meet the design requirements. Summary of the Invention

[0007] In view of the characteristics and technical drawbacks of existing bidirectional in-situ curing mixing equipment, this invention provides a novel bidirectional in-situ curing mixing equipment. The equipment structure achieves a staggered mixing effect by bidirectional rotation of the mixing blades through two mixing shafts. The rotation speed of the mixing head is monitored by a hydraulic flow meter. The equipment can deliver different media through pipelines. The appropriate nozzle arrangement and nozzle structure are conducive to the uniform mixing of the curing agent and the in-situ soil.

[0008] To achieve the objectives of this invention, the following technical solution is proposed:

[0009] A bidirectional in-situ curing mixing device includes a mounting base plate, an extension arm, at least two mixing heads, an oil circuit system, and a delivery pipeline system. The upper end of the extension arm is fixedly connected to the mounting base plate. Multiple mixing heads are arranged at intervals along the circumference at the lower end of the extension arm. Each mixing head includes a mixing fixing part, a bidirectional rotation drive assembly, a first mixing rotation part, and a second mixing rotation part. The mixing fixing part is located at the lower end of the extension arm. A plurality of fixed mixing blades are arranged at intervals along the circumference of the outer periphery of the mixing fixing part. The bidirectional rotation drive assembly is located on the mixing fixing part and is connected to the first mixing rotation part and the second mixing rotation part, respectively. The mixing fixing part, the first mixing rotation part, and the second mixing rotation part are coaxially arranged. The bidirectional rotary drive assembly drives the first and second mixing rotating parts to rotate in opposite directions. The first mixing rotating part has several first mixing blades arranged circumferentially at intervals on its outer periphery, and the second mixing rotating part has several second mixing blades arranged circumferentially at intervals on its outer periphery. The fixed mixing blades, the first mixing blades, and the second mixing blades are staggered to achieve a mutual cutting effect on the soil. At least one fixed mixing blade in each mixing head has a nozzle on its inner side. The oil circuit system provides power to the bidirectional rotary drive assembly to drive the mixing heads to rotate and mix, and simultaneously calculates and records the number of rotations based on the oil flow rate. The delivery pipeline system allows for arbitrary switching of the delivery medium and ensures that the delivery medium is sprayed out from the nozzle. This equipment increases the mixing force and uniformity through multiple mixing heads. The mutual cutting effect of the fixed mixing blades, the first mixing blades, and the second mixing blades further enhances the mixing capacity. The oil circuit system records the number of rotations of the mixing heads, and the construction rotation data control ensures the quality of in-situ mixing of the curing agent and the soil. Finally, the delivery pipeline system and nozzles work together to prevent clogging during mixing operations, ensuring project quality.

[0010] Preferably, the mixing fixing part is a fixed support, which is fixedly installed at the lower end of the extension arm. The fixed mixing blades are arranged circumferentially on the outer peripheral wall of the fixed support. The first mixing rotating part includes a first rotating shaft and a first rotating shell. The first rotating shaft is driven by the bidirectional rotating drive assembly through a first transmission part. The first rotating shell is fixedly connected to the first rotating shaft. A plurality of first mixing blades are arranged circumferentially on the outer peripheral wall of the first rotating shell. The second mixing rotating part includes a second rotating shaft and a second rotating shell. The second rotating shaft is driven by the bidirectional rotating drive assembly through a second transmission part. The second rotating shell is fixedly connected to the second rotating shaft. A plurality of second mixing blades are arranged circumferentially on the outer peripheral wall of the second rotating shell. The second rotating shell rotates in opposite directions to the first rotating shell, enabling the first and second mixing blades to perform staggered mixing. The two mixing shafts are respectively connected to the two rotating shells. The first and second mixing blades arranged on the two rotating shells respectively cut and mix the soil during operation, improving the mixing quality and efficiency of the solidified soil.

[0011] Preferably, the second rotating shell is located between the fixed support and the first rotating shell; end cutters are arranged at intervals along the circumference at the ends of the first rotating shell; a cover plate is provided on the bottom surface of the first rotating shell; several ribs are arranged along the diameter of the cover plate; the ribs protrude from the cover plate by 3 to 5 cm. The cover plate encloses the rotating shell, and the protruding ribs on the cover plate also serve to assist in stirring and strengthen the structure.

[0012] Preferably, the first mixing blade, the second mixing blade, and the fixed mixing blade each include a vertical plate and at least one horizontal plate; the horizontal plate is connected to the outer peripheral wall of the rotating shell through the vertical plate; the horizontal plates on the first and second mixing blades form an angle of 15° to 30° with the tangent direction of the rotating shell, and the horizontal plate on the fixed mixing blade is horizontally arranged with the tangent direction of the rotating shell, and the horizontal plates on the first, second, and fixed mixing blades are staggered in the direction perpendicular to the rotating shell. Multiple sets of mixing blades can thoroughly mix the undisturbed soil. The mixing blades and fixed mixing blades adopt a combination structure of vertical and horizontal plates, and the angle of the horizontal plates ensures mixing efficiency. The horizontal plates of each blade adopt a staggered structure, and the staggered order can be arbitrarily adjusted according to the reinforcement operation requirements. The staggered structure can achieve a mutual shearing effect during mixing, and the multi-layered horizontal plate structure can obtain more mixing times under bidirectional rotation, making the curing agent and soil more uniformly mixed.

[0013] Preferably, the nozzles are located inside the vertical plate of the fixed mixing blades. Each nozzle head is an isosceles trapezoidal shape, with the diameter gradually decreasing from the inside to the outside. The nozzle head has both horizontal and vertical slit-like nozzles, or a circular nozzle at the end of the nozzle head. This structure allows the slit-like nozzles on the umbrella-shaped nozzles to achieve better atomization when the curing agent is sprayed out. The nozzles being hidden inside the fixed mixing blades prevents clogging due to excessive soil pressure during the sinking and lifting process, ensuring a continuous and stable output of the curing agent and high-pressure gas.

[0014] Preferably, the first rotating shaft is an inner rotating rod, and the second rotating shaft is an outer rotating rod. The second rotating shaft has a hollow structure and is sleeved on the outer peripheral wall of the first rotating shaft. The first and second rotating shafts are coaxially arranged and can rotate relative to each other. The first rotating shaft is connected to the first rotating housing through a connecting section one, and the second rotating shaft is connected to the second rotating housing through a connecting section two. The bidirectional rotation drive assembly provides rotational power to the first and second rotating shafts. This structure, through the connection of the connecting sections and the rotating housing, achieves the opposite rotation of the first and second stirring blades, thereby achieving the purpose of staggered shearing and stirring.

[0015] Preferably, the bidirectional rotary drive assembly includes one or two hydraulic motors. When driven by a single hydraulic motor, the drive shaft of the hydraulic motor is equipped with two drive gears. One drive gear directly meshes with a driven gear connected to a rotating shaft to achieve transmission, while the other drive gear meshes with a driven gear connected to another rotating shaft through a reversing gear to achieve transmission, thereby causing the two rotating rods to rotate in opposite directions. When driven by two hydraulic motors, each drive shaft of the two hydraulic motors is equipped with a drive gear. The two drive gears respectively mesh with driven gears connected to a first rotating shaft and a driven gear connected to a second rotating shaft to achieve transmission, thereby causing the two rotating shafts to rotate in opposite directions. The arrangement of the two hydraulic motors can be reasonably selected according to the performance requirements of the construction machinery. When the mixing head needs to operate on harder strata, a more powerful dual hydraulic motor can be used to provide torque to the two mixing heads respectively, thereby improving the mixing capacity of the mixing head.

[0016] Preferably, the hydraulic system includes an inlet valve, an outlet valve, a control valve, and a hydraulic flow meter. The inlet valve and outlet valve are respectively mounted on the extension arm. The inlet valve is connected to the inlet section of the control valve via an inlet pipe. The hydraulic flow meter is connected to port one of the control valve via an oil pipe. The hydraulic flow meter is also connected to the bidirectional rotary drive assembly of each stirring head via a first drive oil pipe. The bidirectional rotary drive assembly of each stirring head is connected to port two of the control valve via a second drive oil pipe. The outlet section of the control valve is connected to the outlet valve via an outlet pipe. The inlet and outlet pipes are responsible for circulating the hydraulic system oil. The control valve changes the inlet and outlet direction, thereby changing the stirring direction of the stirring head. The first and second drive oil pipes are connected to the hydraulic motor at the end of the hydraulic system. The hydraulic flow meter can calculate the stirring head speed by measuring the change in hydraulic oil flow. By monitoring the stirring head speed in real time, the construction time of the stirring head's up-and-down movement is adjusted to ensure that the number of times the curing agent and soil are mixed meets the design requirements.

[0017] Preferably, the delivery pipeline system includes channel one and channel two; both channel one and channel two can be used to deliver one or more of curing agent powder, curing agent slurry, and high-pressure gas according to different construction needs; channel one and channel two are respectively arranged on the extension arm, with the lower ends of channel one and channel two extending to the bottom of the outside of the mixing head, and connecting and converging at the bottom of the outside of the mixing head to form a mixing area; each mixing head is provided with a nozzle, and each nozzle is connected to the mixing area through a branch, with the included angle between two adjacent nozzles being the same as the included angle between two adjacent mixing heads. The two channels are responsible for delivering curing agent slurry, dry powder, or high-pressure gas according to process requirements; if high-pressure gas is used, it can reduce the mixing resistance during soil mixing and also help to distribute the curing agent evenly.

[0018] A construction method for a two-way in-situ curing mixing device, comprising the following construction steps using the aforementioned two-way in-situ curing mixing device:

[0019] (a) Before construction, the area to be cured should be laid out and the construction area should be divided. If there are areas with large cross-sectional changes, the treatment blocks should be adjusted accordingly to facilitate construction.

[0020] (b) Fix the structure of the in-situ curing and mixing equipment to the front end of the excavator or other construction carrier; connect the valves, controllers and oil pipes of the oil circuit system that drives the mixing head to rotate in sequence, and connect them to the hydraulic function system of the construction carrier; at the same time, connect the conveying pipeline system to the material supply backend through the material supply pipe and the air supply pipe to provide curing agent and auxiliary high-pressure gas for curing and mixing.

[0021] (c) After the construction equipment is in place, the material supply backend begins to transport the curing agent slurry through the material supply pipe or to transport the curing agent powder using high-pressure gas through pneumatic conveying. At the same time, the material supply backend begins to provide high-pressure gas for efficient spraying of the curing material through the gas supply pipe. When the curing agent material and high-pressure gas are transported to the mixing head, the on-site curing mixing equipment structure begins to be inserted into the soil for mixing construction.

[0022] (d) During the on-site mixing process, depending on the moisture content of the original soil and the type of curing agent, a vertical mixing and curing method is adopted. The mixing equipment is vertically inserted into the soil in place for mixing. The first and second mixing blades on the mixing head rotate in opposite directions, while the fixed mixing blades on the mixing head remain stationary. The three sets of blades spaced apart can achieve a good effect of staggered mixing during the mixing operation. During construction, the on-site curing mixing equipment gradually penetrates into the ground for mixing and continuously sprays curing agent materials and high-pressure gas to the designed curing depth. To ensure the bottom mixing effect, the sinking speed of the mixing equipment should be appropriately slowed down when it is close to the bottom, and it should stay at the bottom for at least 10 seconds before reversing the rotation and lifting operation until the mixing head is lifted out of the ground to complete the mixing operation.

[0023] (e) Move the on-site solidification mixing equipment to the next work location and repeat the construction steps (d). During the construction process, ensure that the overlap width between the two work areas is not less than 5cm.

[0024] (f) After the curing construction is completed, use engineering machinery and equipment to compact, level and maintain the surface of the cured area to promote the improvement of the foundation bearing capacity of the cured area.

[0025] In summary, the advantages of this invention are:

[0026] 1) The bidirectional in-situ curing mixing device structure of the present invention utilizes bidirectional mixing function. By staggering two types of rotating mixing blades and fixed mixing blades, it achieves mutual shearing of soil between adjacent blades and uniform mixing effect. This structural design allows the curing agent and the in-situ soil to be mixed more thoroughly and uniformly, significantly improving mixing uniformity and construction efficiency.

[0027] 2) The rotation direction of the mixing head can be precisely adjusted via the control valve, and combined with the real-time monitoring function of the flow meter, the mixing frequency of the mixing head can be accurately monitored and controlled. Based on this data, the operator can accurately control the construction parameters to ensure that the mixing operation in each construction area meets the design quality requirements, thereby improving the overall quality control and reliability of the project construction.

[0028] 3) Depending on the construction process requirements, hydraulic motors of varying numbers and structures can be designed to drive the mixing head. This design ensures sufficient power even when the single-operation area is large. A well-designed nozzle position and structure effectively prevent nozzle clogging and ensure more uniform curing agent spraying.

[0029] 4) During construction, providing high-pressure gas through the gas channel can effectively reduce the resistance during the mixing process. This not only benefits the mixing operation, but also helps the curing agent to flow smoothly and be mixed evenly in the soil, thereby improving the project quality and construction efficiency. Attached Figure Description

[0030] Figure 1 This is a front view of the structure of the bidirectional in-situ curing mixing device according to Embodiment 1 of the present invention.

[0031] Figure 2 This is a front view of the structure of the bidirectional in-situ curing mixing device according to Embodiment 2 of the present invention.

[0032] Figure 3 This is a front view of the bidirectional in-situ curing mixing device according to Embodiment 3 of the present invention.

[0033] Figure 4 This is a front view of the single-sided stirring head structure according to Embodiment 1 of the present invention.

[0034] Figure 5 This is a front view of the single-sided stirring head structure in Embodiment 2 of the present invention.

[0035] Figure 6 This is a front view of the single-sided stirring head structure in Embodiment 3 of the present invention.

[0036] Figure 7 This is a side view of the single-sided stirring head structure according to Embodiment 1 of the present invention.

[0037] Figure 8 This is a side view of the single-sided stirring head structure in Embodiment 2 of the present invention.

[0038] Figure 9 This is a side view of the single-sided stirring head structure in Embodiment 3 of the present invention.

[0039] Figure 10 This is a cross-sectional view of the stirring head structure of the present invention.

[0040] Figure 11 This is a schematic diagram of the dual hydraulic motor structure of the present invention.

[0041] Figure 12 This is a schematic diagram of the single hydraulic motor structure of the present invention.

[0042] Figure 13 This is a schematic diagram of the fixed stirring blade structure of the present invention.

[0043] Figure 14 This is a schematic diagram of the rotating blade structure of the present invention.

[0044] Figure 15 This is a schematic diagram of the nozzle structure of the injection pipe of the present invention.

[0045] Figure 16 This is a schematic diagram of the nozzle structure of the jet pipe of the present invention.

[0046] Figure 17 This is a schematic diagram of the construction of the present invention.

[0047] Explanation of reference numerals in the attached figures:

[0048] 1. Mounting base plate; 11. Pin shaft; 12. Connecting plate; 13. Pin hole; 2. Extension arm; 21. Rib plate; 22. Fixed support; 3. Stirring head; 311. First stirring blade; 312. Second stirring blade; 32. Fixed stirring blade; 331. Vertical plate; 332. Horizontal plate; 333. Reinforcing rib; 34. End cutter head; 351. First rotating shaft; 352. Second rotating shaft; 361. First rotating housing; 3612. Connecting section one; 362. Second rotating housing; 3622. Connecting section two; 37. Cover plate; 38. Rib plate; 39. Hydraulic motor; 391. Drive gear; 392. Driven gear; 393. Reversing gear 4. Oil circuit system; 41. Inlet valve; 42. Outlet valve; 43. Control valve; 44. Hydraulic flow meter; 451. Inlet pipe; 452. Outlet pipe; 461. First drive pipe; 462. Second drive pipe; 5. Conveying pipeline system; 50. Mixing zone; 51. Channel 1; 52. Channel 2; 53. Nozzle; 531. Nozzle head; 54. Horizontal slit nozzle; 55. Vertical slit nozzle; 56. Circular nozzle; 6. Material supply backstage; 61. Material supply pipe; 62. Air supply pipe; 7. Construction carrier. Detailed Implementation

[0049] First, those skilled in the art should understand that these embodiments are merely used to explain the technical principles of the embodiments of this application and are not intended to limit the scope of protection of the embodiments of this application. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0050] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0051] In the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0052] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0053] Example 1

[0054] The following combination Figure 1 , Figure 4 , Figure 7 , Figure 10 , Figure 11 , Figures 13-17 The present invention will be further described and illustrated below.

[0055] This project case involves a warehousing facility construction project in an inland river and lake area. The project site has a widespread layer of soft soil. In some areas, this soft soil layer is directly exposed on the surface, characterized by high water content, low bearing capacity, and high compressibility. The soil layer is dark brown, composed of clay particles and peat moss, rich in humus and plant debris, with a soft texture, fine feel, and smooth cut surfaces. A small amount of fine sand particles are mixed in at the top of the peat layer, and the overall condition is saturated and semi-fluid. To ensure the stable operation of various heavy construction machinery (such as pile drivers) during the construction of the warehousing facility, and the future safety and reliability of the warehousing facility, targeted foundation reinforcement of the soft soil layer is required. The designed reinforcement depth is 3.5m. Given the high water content of the peat layer, we chose a wet grouting method assisted by high-pressure gas. PO 42.5 ordinary Portland cement was used as the grouting material, with 120kg of cement added to each cubic meter of peat soil to achieve the designed curing effect.

[0056] like Figure 1As shown, the bidirectional in-situ curing mixing equipment used in this embodiment includes a mounting base plate 1, an extension arm 2, a mixing head 3, an oil circuit system 4, and a delivery pipeline system 5; the upper end of the extension arm 2 is fixedly connected to the mounting base plate 1; this embodiment uses two mixing heads 3, symmetrically arranged on both sides of the lower end of the extension arm 2, with an included angle of 130°; each mixing head 3 includes a mixing fixing part, a bidirectional rotation drive assembly, a first mixing rotation part, and a second mixing rotation part; the mixing fixing part is located at the lower end of the extension arm 2; a plurality of fixed mixing blades 32 are arranged circumferentially at intervals on the outer periphery of the mixing fixing part; the bidirectional rotation drive assembly is located on the mixing fixing part, and the bidirectional rotation drive assembly is connected to the first mixing rotation part and the second mixing rotation part respectively, and the mixing fixing part, the first mixing rotation part, and the second mixing rotation part are coaxially arranged; the bidirectional rotation drive... The component is used to drive the first and second stirring rotating parts to rotate in opposite directions; a plurality of first stirring blades 311 are arranged at intervals along the circumferential direction on the outer periphery of the first stirring rotating part, and a plurality of second stirring blades 312 are arranged at intervals along the circumferential direction on the outer periphery of the second stirring rotating part, and the fixed stirring blades 32, the first stirring blades 311 and the second stirring blades 312 are staggered to achieve the effect of cutting the soil with each other; a nozzle 53 is provided on the inner side of at least one fixed stirring blade 32 in each stirring head 3, and the oil circuit system 4 provides power to the bidirectional rotating drive component to drive the stirring head 3 to perform rotating stirring action, and at the same time calculates and records the number of rotations by the flow rate of oil; the conveying pipeline system 5 is used to arbitrarily switch the conveying medium (conveying cement slurry and high-pressure gas) and make the conveying medium (conveying cement slurry and high-pressure gas) sprayed out from the nozzle 53. The equipment uses two mixing heads 3 to increase the mixing force and uniformity. At the same time, the fixed mixing blades 32, the first mixing blade 311 and the second mixing blade 312 cut each other to further enhance the mixing capacity. The oil circuit system 4 can record the number of rotations of the mixing heads. The construction rotation data control ensures the mixing quality of the curing agent and the soil in situ. Finally, the delivery pipeline system 5 and the nozzle 53 work together to prevent clogging during the mixing operation and ensure the quality of the project.

[0057] like Figure 1 and Figure 17 As shown, the mounting base plate 1 is connected to the excavator boom via pin 11, connecting plate 12 and pin hole 13. The excavator model is at least 250. The excavator is used to operate the bidirectional in-situ solidification mixing equipment to mix the solidified soil vertically up and down.

[0058] like Figure 1As shown, the extension arm 2 has a hollow structure, effectively reducing the equipment's weight. Ribs 21 are installed at the mounting base plate 1 for reinforcement. The total length of the extension arm 2 and the mixing head is 5m, ensuring the effective reinforcement depth meets design requirements. The mixing fixing part is a fixed support 22, located at the bottom of the extension arm 2. There are two fixed supports 22, symmetrically arranged, giving the bidirectional in-situ curing mixing equipment structure a working projection size of 1300mm × 800mm. Fixed mixing blades 32 are evenly distributed on the outer circumference of the end disc of the fixed support 22. Figure 7 As shown, each stirring head 3 has four sets of fixed stirring blades 32 on its fixed support 22.

[0059] like Figure 1 , Figure 4 and Figure 7 As shown, in this embodiment, the first stirring and rotating part includes a first rotating shaft 351 and a first rotating housing 361; the first rotating shaft 351 is connected to the bidirectional rotating drive assembly via a first transmission part; the first rotating housing 361 is fixedly connected to the first rotating shaft 351; four sets of first stirring blades 311 are arranged at equal intervals along the circumference on the outer peripheral wall of the first rotating housing 361; the second stirring and rotating part includes a second rotating shaft 352 and a second rotating housing 362; the second rotating shaft 352 is connected to the bidirectional rotating drive assembly via a second transmission part; the second rotating housing 362 is fixedly connected to the second rotating shaft 352; four sets of second stirring blades 312 are arranged at equal intervals along the circumference on the outer peripheral wall of the second rotating housing 362; the second stirring blades 312 are located between the fixed stirring blades 32 and the first stirring blades 311; the second rotating housing 362 rotates in opposite directions to the first rotating housing 361, and the first stirring blades 311 and the second stirring blades 312 achieve a staggered stirring function. Three sets of end cutters 34 are arranged at equal intervals along the circumference of the end of the first rotating shell 361, and the end cutters 34 protrude 4 cm from the surface of the first rotating shell 361. A cover plate 37 is provided on the bottom surface of the first rotating shell 361. Two mutually perpendicular ribs 38 are arranged along the diameter of the cover plate 37. The ribs 38 protrude 3 cm from the surface of the cover plate 37. The cover plate 37 encloses the rotating shell, and the protruding ribs 38 on the cover plate 37 also serve to assist in mixing and strengthen the structure. Two mixing shafts are connected to two rotating shells respectively. The first mixing blade 311 and the second mixing blade 312 arranged on the two rotating shells respectively, together with the end cutters 34 at the end of the mixing head 3, cut and mix the soil during operation, thereby improving the mixing effect and efficiency of the solidified soil.

[0060] like Figure 4 , Figure 7 , Figure 13 and Figure 14As shown, the first stirring blade 311, the second stirring blade 312, and the fixed stirring blade 32 all include a vertical plate 331 and a horizontal plate 332. Each blade has a horizontal plate 332. The horizontal plates 332 of the fixed stirring blade 32 and the first stirring blade 311 are located inside the second stirring blade 312, achieving a staggered effect for the three types of blades. The middle of the horizontal plate 332 is connected to the vertical plate 331 and reinforced by reinforcing ribs 333. The horizontal plates 332 of the first stirring blade 311 and the second stirring blade 312 form an angle of 25° with the tangent direction of the circular rotating shell. The fixed stirring blade 32... The horizontal plate 332 is horizontal to the tangent direction of the circular rotating shell; the adjacent mixing blades and the fixed mixing blades 32 are arranged in upper and lower layers. Multiple sets of mixing blades can fully mix the original soil. The mixing blades and the fixed mixing blades 32 adopt a combination structure of vertical plate 331 and horizontal plate 332. The included angle of the horizontal plate 332 ensures the mixing efficiency. The horizontal plate 332 of each blade adopts a staggered arrangement structure. The staggered arrangement can be arbitrarily adjusted according to the reinforcement operation requirements. The staggered arrangement structure can achieve mutual shearing during the mixing process, so that the curing agent and the soil are mixed more evenly.

[0061] like Figure 11 As shown, in this embodiment, the first rotating shaft 351 is an inner rotating rod, and the second rotating shaft 352 is an outer rotating rod. The second rotating shaft 352 has a hollow structure and is sleeved on the outer peripheral wall of the first rotating shaft 351. The first rotating shaft 351 and the second rotating shaft 352 are coaxially arranged and can rotate relative to each other. The first rotating shaft 351 is connected to the first rotating housing 361 through connecting section one 3612, and the second rotating shaft 352 is connected to the second rotating housing 362 through connecting section two 3622. The bidirectional rotation drive assembly is used to provide rotational power for the first rotating shaft 351 and the second rotating shaft 352. The above structure realizes the opposite rotation of the first stirring blade 311 and the second stirring blade 312 through the connection of the connecting section and the rotating housing, thereby achieving the purpose of staggered shearing and stirring. In this embodiment, a single stirring head 3 uses two hydraulic motors 39 to drive the first rotating shaft 351 and the second rotating shaft 352 to rotate respectively. The driving gears 391 on the drive shafts of the two hydraulic motors 39 mesh with the driven gears 392 on the first rotating shaft 351 and the second rotating shaft 352 respectively, so that the two rotate in opposite directions, thereby achieving the purpose of bidirectional stirring.

[0062] like Figure 10As shown, the oil circuit system 4 includes an inlet valve 41, an outlet valve 42, a control valve 43, and a hydraulic flow meter 44. The inlet valve 41 and the outlet valve 42 are respectively installed on the extension arm 2. The inlet valve 41 is connected to the inlet part of the control valve 43 through an inlet pipe 451. The hydraulic flow meter 44 is connected to port one of the control valve 43 through an oil pipe. The hydraulic flow meter 44 is connected to the bidirectional rotation drive assembly of each stirring head 3 through a first drive oil pipe 461. The bidirectional rotation drive assembly of each stirring head 3 is connected to port two of the control valve 43 through a second drive oil pipe 462. The outlet part of the control valve 43 is connected to the outlet valve 42 through an outlet pipe 452. The above structure is responsible for the circulation of hydraulic system oil circuit through oil inlet pipe 451 and oil outlet pipe 452. The control valve 43 changes the direction of oil inlet and outlet, thereby changing the stirring direction of the stirring head. The first drive oil pipe 461 and the second drive oil pipe 462 are connected to the hydraulic motor 39 at the end of the oil circuit system 4. The hydraulic flow meter 44 can calculate the rotation speed of the stirring head 3 by changing the flow rate of hydraulic oil. By monitoring the rotation speed of the stirring head 3 in real time, the up and down operation time is adjusted to ensure that the number of times the curing agent and soil are stirred meets the design requirements.

[0063] like Figure 1 , Figures 15-17 As shown, the conveying pipeline system 5 includes channel one 51 and channel two 52. Both channel one 51 and channel two 52 can be used to convey one or more of the following according to different construction needs: curing agent powder, curing agent slurry, or high-pressure gas. High-pressure gas can reduce the stirring resistance during stirring and also helps to evenly distribute the curing agent. In this embodiment, wet construction auxiliary air jetting is used. Channel one 51 is used for cement slurry to pass through. Channel two 52 is connected to the air supply pipe 62 of the external material supply backend 6 and is responsible for transporting auxiliary high-pressure gas to assist stirring. The lower ends of the two channels extend to the bottom of the outside of the stirring head 3, and they connect and merge at the bottom of the outside of the stirring head 3 to form a mixing area 50. Each stirring head 3 is equipped with a nozzle 53, which is located inside the vertical plate 331 of the fixed stirring blade 32. Each nozzle 53 is connected to the mixing area 50 through a branch channel, and the included angle between two adjacent nozzles 53 is the same as the included angle between two adjacent stirring heads 3.

[0064] like Figure 16 As shown in (a), each nozzle 53 has an isosceles trapezoidal nozzle head 531, with the nozzle head 531 gradually decreasing in diameter from the inside to the outside. The nozzle head 531 has a transverse slit-shaped nozzle 54 and a vertical slit-shaped nozzle 55 respectively. Through this structure, the slit-shaped nozzles on the umbrella-shaped nozzle 53 are more conducive to forming a better atomization effect when the curing agent is sprayed out. The nozzle 53 is hidden inside the fixed stirring blade 32, which can prevent the nozzle from being blocked due to excessive soil pressure during the sinking and lifting process, ensuring a continuous and stable output of curing agent material and high-pressure gas.

[0065] like Figure 17As shown, it also includes a material supply backstage 6 and a construction carrier 7, which are connected to the conveying pipeline system 5 through a material supply pipe 61 and an air supply pipe 62. The material supply backstage 6 provides curing agent and auxiliary high-pressure gas for curing and mixing.

[0066] like Figure 17 As shown, the method of using the bidirectional in-situ curing mixing equipment structure in this embodiment is as follows:

[0067] (a) Before construction, the pre-cured mixing treatment area shall be laid out and the construction area shall be divided. If there are areas with large changes in soil cross-section, the foundation treatment block shall be adjusted accordingly to facilitate construction.

[0068] (b) The structure of the on-site curing and mixing equipment is fixed to the front end of the excavator or other construction carrier 7 through the connecting plate 12, pin 11 and pin hole 13; the valves, controllers and oil pipes in the oil circuit system 4 that drives the mixing head 3 to rotate are connected in sequence and connected to the hydraulic function system of the construction carrier 7; at the same time, the conveying pipeline system 5 is connected to the material supply back-end 6 through the material supply pipe 61 and the air supply pipe 62 to provide curing agent and auxiliary high-pressure gas for curing and mixing.

[0069] (c) After the construction equipment is in place, the material supply back-end 6 begins to transport cement slurry through the material supply pipe 61. At the same time, the material supply back-end 6 begins to provide high-pressure gas for solidification and mixing through the air supply pipe 62. When the cement slurry and high-pressure gas are transported to the mixing head 3, the soil mixing construction begins.

[0070] (d) During the on-site mixing process, depending on the moisture content of the original soil and the type of curing agent, a vertical mixing and curing method is adopted. The mixing equipment is vertically inserted into the soil in place for mixing. The first mixing blade 311 and the second mixing blade 312 on the mixing head 3 rotate in opposite directions, while the fixed mixing blade 32 on the mixing head 3 remains stationary. The three sets of blades spaced apart achieve a staggered mixing effect during the mixing process. During construction, the mixing is gradually deepened and the curing material and high-pressure gas are continuously sprayed until the designed curing depth is reached. To ensure the bottom mixing effect, the speed of the mixing equipment should be appropriately slowed down when it is close to the bottom, and it should stay at the bottom for at least 10 seconds before rotating and lifting in the opposite direction until the mixing head 3 is lifted out of the ground to complete the mixing operation.

[0071] (e) Move the construction equipment to the next work position and repeat the construction steps (d). During the construction process, ensure that there is an overlap width of no less than 5cm between the two work areas.

[0072] (f) After the curing construction is completed, use engineering machinery to compact, level and maintain the surface of the cured area to promote the improvement of the foundation bearing capacity of the cured area.

[0073] Example 2

[0074] The following combination Figure 2 , Figure 5 , Figure 8 , Figure 10 , Figures 12-17 To further illustrate this invention, the engineering background of this embodiment is a proposed wind power project in a coastal reclamation site. After two years of natural drying and settling following the completion of reclamation, the surface is relatively flat. Site survey results show that a thick layer of silt is distributed within the site. This silt layer is characterized by high water content, low strength, and high compressibility, posing a challenge to the project construction. In some areas, the silt is directly exposed on the surface, severely affecting the entry of heavy machinery for construction. To meet the foundation bearing capacity requirements of the construction site, shallow foundation treatment is required for the soft soil layer within 4m below the surface. The shallow solidification adopts a dry construction method, with high-pressure air injection to assist mixing. KD solidifying agent is selected as the solidifying agent, and the design incorporates 100kg of solidifying agent per cubic meter of soft soil.

[0075] The bidirectional in-situ curing mixing equipment used in this embodiment has a similar structure to that in Embodiment 1, except that:

[0076] The reinforcement depth in this project is 4m, so the total length of the extension arm 2 and mixing head 3 of the proposed mixing equipment structure needs to be 6m, and the maximum working depth can reach 5m. The bottom of the proposed bidirectional in-situ curing mixing equipment structure is equipped with three mixing heads 3, with an included angle of 140° between each mixing head 3 and they are evenly and symmetrically arranged. At the same time, there are three nozzles 53. The working projection triangle of the bidirectional in-situ curing mixing equipment structure has a side length of 1500mm. Three sets of fixed stirring blades 32 are provided on the fixed support 22. Six sets of first stirring blades 311 and second stirring blades 312 are evenly arranged. The horizontal plate 332 on the second stirring blade 312 is located inside the horizontal plate 332 of the first stirring blade 311 and the fixed stirring blade 32. Two sets of end cutters 34 are provided at the end of the stirring head 3, protruding 5cm from the surface of the first rotating shell 361. The rib plate 38 on the cover plate 37 protrudes 5cm from the surface of the cover plate 37. The angle between the horizontal plate 332 of the stirring blades and the tangent direction of the circular rotating shell is 17°. In this embodiment, the interior of a single stirring head 3 is as follows: Figure 12 The setup shown is powered by a hydraulic motor 39. The drive shaft of the hydraulic motor 39 has two drive gears 391. One drive gear 391 directly meshes with the driven gear 392 on the second rotating shaft 352, and the other meshes with the driven gear 392 on the first rotating shaft 351 through a reversing gear 393, so that the two rotating rods rotate in opposite directions. The channel 51 in the conveying pipeline system 5 is used for conveying the curing agent powder, and nozzles 53 are respectively provided inside the fixed stirring blades 32 of the three stirring heads 3. The structure of the nozzles 53 is the same as in Embodiment 1.

[0077] The usage method in this embodiment is the same as in Embodiment 1, and will not be repeated here.

[0078] Example 3

[0079] The following combination Figure 3 , Figure 6 , Figure 9 , Figure 10 , Figures 12-17 To further illustrate this invention, this embodiment relates to a parking lot project in an industrial park next to a river. The original site was a fish and crab farm, with a surface layer of silt rich in organic matter and a lower layer of soft soil with high water content and low bearing capacity. To address the construction challenges, we adopted a dry construction method to reduce the soil moisture content and improve the foundation bearing capacity. We selected PO 42.5 cement as a curing agent, setting an admixture ratio of 150 kg / m³, and a reinforcement design depth of 7 m. This approach ensured both reinforcement effectiveness and cost control, thereby improving the project's economic benefits.

[0080] The bidirectional in-situ curing mixing equipment used in this embodiment has a similar structure to that in Embodiment 1, except that:

[0081] In this embodiment, the reinforcement depth reaches 7 meters, therefore the total length of the extension arm 2 and mixing head 3 of the mixing equipment is at least 8 meters, and the construction carrier 7 uses an excavator of model 300 or above. The mixing equipment structure in this project has two mixing heads 3 at its bottom, symmetrically arranged at an angle of 135°. The working projection size of the bidirectional in-situ curing mixing equipment structure is 1600mm × 850mm. Two sets of fixed mixing blades 32 are provided on the fixed support 22. Six sets of first mixing blades 311 and second mixing blades 312 are evenly distributed, and each blade has two layers of parallel horizontal plates 332. The horizontal plates 332 of adjacent blades are staggered. The outer horizontal plate 332 on the second mixing blade 312 is located at the outermost edge of the corresponding horizontal plates 332 of the first mixing blade 311 and the fixed mixing blade 32. Two sets of end cutters 34 are provided at the end of the mixing head 3, protruding from the first rotating housing 3. 61 Surface 3cm; The ridge plate 38 on the cover plate 37 protrudes 3cm from the surface of the cover plate 37; The angle between the cross plate 332 of the stirring blade and the tangent direction of the circular rotating shell is 22°; Since the stirring equipment in this embodiment has a large number of blades and a large working area, the required stirring energy is high. The interior of a single stirring head 3 uses two high-power hydraulic motors 39, as in Embodiment 1, to drive the first rotating shaft 351 and the second rotating shaft 352 to rotate respectively. The drive gears 391 on the drive shafts of the two hydraulic motors 39 mesh with the driven gears 392 on the first rotating shaft 351 and the second rotating shaft 352 respectively, so that they rotate in opposite directions, thereby achieving the purpose of bidirectional stirring; Since the cement content is high, both channel 1 51 and channel 2 52 in the conveying pipeline system 5 adopt the cement powder conveying method, and nozzles 53 are respectively provided on the inner side of the fixed stirring blade 32 of the stirring head 3. The structure of the nozzles 53 is as follows Figure 16 (b) A circular nozzle 56 is opened at the end of the nozzle 531.

[0082] The structure and usage of the stirring device in this embodiment are the same as in Embodiment 1, and will not be repeated here.

[0083] In the description of the embodiments of this application, it should be noted that the terms "inner" and "outer" and other terms indicating direction or positional relationship are based on the direction or positional relationship shown in the drawings. This is only for the convenience of description and does not indicate or imply that the device or component must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this application.

[0084] In the description of this application, the references to terms such as "an embodiment," "some embodiments," "in this embodiment," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0085] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A bidirectional in-situ curing mixing device, characterized in that, The system includes a mounting base plate (1), an extension arm (2), at least two stirring heads (3), an oil circuit system (4), and a delivery pipeline system (5); the upper end of the extension arm (2) is fixedly connected to the mounting base plate (1); multiple stirring heads (3) are arranged at intervals along the circumference at the lower end of the extension arm (2); each stirring head (3) includes a stirring fixing part, a bidirectional rotation drive assembly, a first stirring rotation part, and a second stirring rotation part; the stirring fixing part is located at the lower end of the extension arm (2); several fixed stirring blades (32) are arranged at intervals along the circumference on the outer periphery of the stirring fixing part; the bidirectional rotation drive assembly is located on the stirring fixing part, and the bidirectional rotation drive assembly is connected to the first stirring rotation part and the second stirring rotation part respectively, and the stirring fixing part, the first stirring rotation part, and the second stirring rotation part are coaxially arranged; the bidirectional rotation drive assembly is used for The first and second stirring rotating parts are driven to rotate in opposite directions; a plurality of first stirring blades (311) are arranged at intervals along the circumferential direction on the outer periphery of the first stirring rotating part, and a plurality of second stirring blades (312) are arranged at intervals along the circumferential direction on the outer periphery of the second stirring rotating part, and the fixed stirring blades (32), the first stirring blades (311) and the second stirring blades (312) are staggered to achieve the effect of cutting the soil with each other; at least one of the fixed stirring blades (32) in each stirring head (3) is provided with a nozzle (53) on the inner side; the oil circuit system (4) provides power to the bidirectional rotating drive assembly to drive the stirring head (3) to perform rotating stirring action, and calculates and records the number of rotations by the amount of oil flowing through; the conveying pipeline system (5) is used to switch the conveying medium at will and make the conveying medium spray out from the nozzle (53); The first stirring and rotating part includes a first rotating shaft (351) and a first rotating shell (361); the second stirring and rotating part includes a second rotating shaft (352) and a second rotating shell (362); the first stirring blade (311), the second stirring blade (312) and the fixed stirring blade (32) each include a vertical plate (331) and at least one horizontal plate (332); the horizontal plate (332) is connected to the peripheral wall of the rotating shell through the vertical plate (331); the horizontal plate (332) on the first stirring blade (311) and the second stirring blade (312) forms an angle of 15° to 30° with the tangent direction of the rotating shell, the horizontal plate (332) on the fixed stirring blade (32) is horizontally arranged with respect to the tangent direction of the rotating shell, and the horizontal plates (332) on the first stirring blade (311), the second stirring blade (312) and the fixed stirring blade (32) are staggered in the direction perpendicular to the rotating shell.

2. The bidirectional in-situ curing and mixing equipment according to claim 1, characterized in that, The stirring fixing part is a fixed support (22), which is fixedly installed at the lower end of the extension arm (2). The fixed stirring blades (32) are arranged circumferentially on the outer peripheral wall of the fixed support (22). The first rotating shaft (351) is connected to the bidirectional rotating drive assembly through the first transmission part. The first rotating housing (361) is fixedly connected to the first rotating shaft (351). A plurality of first stirring blades (311) are arranged circumferentially on the outer peripheral wall of the first rotating housing (361). The second rotating shaft (352) is connected to the bidirectional rotating drive assembly through the second transmission part. The second rotating housing (362) is fixedly connected to the second rotating shaft (352). A plurality of second stirring blades (312) are arranged circumferentially on the outer peripheral wall of the second rotating housing (362). The second rotating housing (362) rotates in the opposite direction to the first rotating housing (361), and the first stirring blades (311) and the second stirring blades (312) achieve a staggered stirring function.

3. The bidirectional in-situ curing and mixing equipment according to claim 2, characterized in that, The second stirring blade (312) is located between the first stirring blade (311) and the fixed stirring blade (32); the end of the first rotating housing (361) is provided with end cutters (34) arranged circumferentially at intervals; the bottom surface of the first rotating housing (361) is provided with a cover plate (37); a number of ribs (38) are arranged along the diameter on the cover plate (37); the ribs (38) protrude from the cover plate (37) by 3 to 5 cm.

4. The bidirectional in-situ curing and mixing equipment according to claim 2, characterized in that, The nozzle (53) is located inside the vertical plate (331) of the fixed stirring blade (32). The nozzle (531) of each nozzle (53) is in the shape of an isosceles trapezoid, and the diameter of the nozzle (531) gradually decreases from the inside to the outside. The nozzle (531) is provided with a horizontal slit-shaped nozzle (54) and a vertical slit-shaped nozzle (55), or a circular nozzle (56) is provided at the end of the nozzle (531).

5. The bidirectional in-situ curing and mixing equipment according to claim 2, characterized in that, The first rotating shaft (351) is an inner rotating rod, and the second rotating shaft (352) is an outer rotating rod. The second rotating shaft (352) has a hollow structure and is sleeved on the outer peripheral wall of the first rotating shaft (351). The first rotating shaft (351) and the second rotating shaft (352) are coaxially arranged and can rotate relative to each other. The first rotating shaft (351) is connected to the first rotating housing (361) through a connecting section one (3612), and the second rotating shaft (352) is connected to the second rotating housing (362) through a connecting section two (3622). The bidirectional rotation drive assembly is used to provide rotational power for the first rotating shaft (351) and the second rotating shaft (352).

6. The bidirectional in-situ curing and mixing equipment according to claim 1, characterized in that, The bidirectional rotary drive assembly includes one or two hydraulic motors (39). When driven by a single hydraulic motor (39), the drive shaft of the hydraulic motor (39) is provided with two drive gears (391). One drive gear (391) directly meshes with a driven gear (392) connected to a rotating shaft to achieve transmission. The other drive gear (391) meshes with a driven gear (392) connected to another rotating shaft through a reversing gear (393) to achieve transmission, thereby causing the two rotating shafts to rotate in opposite directions. When driven by two hydraulic motors (39), each of the two hydraulic motors (39) is provided with a drive gear (391). The two drive gears (391) mesh with a driven gear (392) connected to a first rotating shaft (351) and a driven gear (392) connected to a second rotating shaft (352) respectively to achieve transmission, thereby causing the two rotating shafts to rotate in opposite directions.

7. The bidirectional in-situ curing and mixing equipment according to claim 1, characterized in that, The oil circuit system (4) includes an inlet valve (41), an outlet valve (42), a control valve (43), and a hydraulic flow meter (44). The inlet valve (41) and the outlet valve (42) are respectively installed on the extension arm (2). The inlet valve (41) is connected to the inlet part of the control valve (43) through an inlet pipe (451). The hydraulic flow meter (44) is connected to port one of the control valve (43) through an oil pipe. The hydraulic flow meter (44) is connected to the bidirectional rotation drive assembly of each stirring head (3) through a first drive oil pipe (461). The bidirectional rotation drive assembly of each stirring head (3) is connected to port two of the control valve (43) through a second drive oil pipe (462). The outlet part of the control valve (43) is connected to the outlet valve (42) through an outlet pipe (452).

8. The bidirectional in-situ curing mixing equipment according to claim 1, characterized in that, The conveying pipeline system (5) includes channel one (51) and channel two (52); channel one (51) and channel two (52) can be used to convey one or more of curing agent powder, curing agent slurry and high-pressure gas according to different construction needs; channel one (51) and channel two (52) are respectively set on the extension arm (2), the lower end of channel one (51) and the lower end of channel two (52) respectively extend to the bottom of the outside of the stirring head (3), and connect and merge at the bottom of the outside of the stirring head (3) to form a mixing area (50); each stirring head (3) is provided with a nozzle (53), each nozzle (53) is connected to the mixing area (50) through a branch, and the included angle between two adjacent nozzles (53) is the same as the included angle between two adjacent stirring heads (3).

9. A construction method for a two-way in-situ curing mixing device, characterized in that, The application of the bidirectional in-situ curing and mixing equipment according to any one of claims 1-8 includes the following steps: (a) Before construction, the pre-cured mixing treatment area shall be laid out and the construction area shall be divided. If the soil cross-section changes significantly, the foundation treatment block shall be adjusted accordingly to facilitate construction. (b) Fix the structure of the on-site curing and mixing equipment to the front end of the excavator or other construction carrier; connect the valves, controllers and oil pipes in the oil circuit system (4) that drives the mixing head (3) to rotate in sequence, and connect them to the hydraulic function system of the construction carrier; at the same time, connect the conveying pipeline system (5) to the material supply backend through the material supply pipe and the air supply pipe to provide curing agent and auxiliary high-pressure gas for curing and mixing. (c) After the construction equipment is in place, the material supply backend begins to transport the curing agent slurry through the material supply pipe or to transport the curing agent powder using high pressure gas by pneumatic conveying. At the same time, the material supply backend begins to provide high pressure gas for efficient spraying of the curing material through the gas supply pipe. When the curing agent material and high pressure gas are transported to the mixing head (3), the on-site curing mixing equipment structure begins to be inserted into the soil for mixing construction. (d) During the on-site mixing construction, depending on the moisture content of the original soil and the type of curing agent, a vertical mixing and curing treatment method is adopted. The mixing equipment is vertically inserted into the soil in place for mixing. The first mixing blade (311) and the second mixing blade (312) on the mixing head (3) rotate in opposite directions, while the fixed mixing blade (32) on the mixing head (3) remains stationary. The three sets of blades spaced apart can achieve a good effect of staggered mixing during the mixing operation. During construction, the on-site curing mixing equipment structure gradually penetrates into the ground for mixing and continuously sprays curing agent materials and high-pressure gas to the designed depth of curing treatment. In order to ensure the bottom mixing effect, the sinking speed of the mixing equipment should be appropriately slowed down when it is close to the bottom and kept at the bottom for at least 10 seconds before the reverse rotation lifting operation is carried out until the mixing head (3) is lifted out of the ground to complete the mixing operation. (e) Move the on-site solidification mixing equipment to the next work location and repeat the construction step (d). During the construction process, ensure that the overlap width between the two work areas is not less than 5cm. (f) After the curing construction is completed, use engineering machinery and equipment to compact, level and maintain the surface of the cured area to promote the improvement of the foundation bearing capacity of the cured area.

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