A mobile device for crushing and mixing raw soil into slurry and solidifying the slurry and a construction method thereof

Abstract

The application discloses a kind of original soil crushing and solidification stirring mobile device and construction method, including external support protection component, internal power driven component and multistage stirring and breaking soil component, wherein external support protection component includes lug plate, installation top plate and sleeve, sleeve is hung below installation top plate, water inlet is opened in the side wall of sleeve, for connecting external mud pool and introducing water source;Internal power driven component is suspended and fixed in sleeve, including hydraulic motor and mud invasion prevention machine seal and motor protective cover;Multistage stirring and breaking soil component includes bearing shaft coaxially connected with hydraulic motor, bearing shaft bottom end extends sleeve and is fixed with the stirring cutter head of hard alloy pick tooth;The application also discloses its variable frequency step-by-step construction process, by controlling motor first with low speed and large torque drive stirring cutter head cutting and breaking soil in situ slurry, then with high speed and high shear drive advancing type stirring paddle generates down pressure turbulent flow and carries out homogenization solidification mixing, realize same machine one-station type efficient continuous operation.

Description

Technical Field

[0001] This invention relates to the field of in-situ slurry making and solidification treatment technology, specifically a mobile device and construction method for in-situ soil crushing, slurry making, solidification and mixing. Background Technology

[0002] In water conservancy projects (such as dike reinforcement, river management, and ecological restoration), geomembrane bag filling technology is widely used. This technology typically requires pumping solidified slurry with a certain degree of fluidity and strength into geomembrane bags for molding. To save resources and costs, on-site materials are often used during construction, utilizing excavated soil (such as clay, silt, or sand) as raw materials for slurry preparation. Currently, the conventional construction process of preparing solidified slurry by excavating soil on-site usually involves the following cumbersome steps: First, excavation is carried out using an excavator; second, the excavated soil is turned over, crushed (the particle size of the soil clods should not exceed 5cm), and screened to remove tree roots and debris; then, the treated dry soil is transported to a fixed mixer, and construction water is added for preliminary slurry preparation; after the slurry preparation is completed and it undergoes secondary filtration and screening, it is then transported to a dedicated solidifying agent mixer, where lime and other solidifying agents are quantitatively added for secondary mixing; finally, the finished product is pumped to a temporary storage tank or directly filled into geomembrane bags. The existing technologies and equipment have certain shortcomings regarding the aforementioned construction processes: Existing semi-in-situ or ex-situ solidification treatments rely on large, fixed ground-based mixing plants (including crushers, slurry mixers, and solidification mixers). In narrow riverbanks or complex terrain sections of water conservancy projects, not only is it difficult to bring in large equipment and it requires a large area, but the excavated soil also needs to be transported multiple times, resulting in high construction costs, complex procedures, and low overall efficiency, making it difficult to meet the needs of continuous membrane bag filling operations. Unlike directly mixing highly moist liquid sludge, when using on-site dry soil for slurry preparation, the initial shear strength of the soil is high. Existing ordinary mixing blades are prone to generating huge eccentric loads and instantaneous stall torque when in contact with dry soil or hard lumps, leading to breakage of the mixing shaft or damage to the reducer. Meanwhile, conventional equipment cannot force water to permeate downwards within a limited space, often resulting in water-soil segregation where the upper layer is water and the lower layer is dry, hard mud. This makes it difficult to consistently achieve the designed specific gravity for the slurry. When lime or other solidifying agents are added after slurry preparation, the slurry system undergoes an exothermic hydration reaction, causing a rapid increase in local viscosity within a short period. Existing mixing equipment often uses simple unidirectional rotating blades, lacking effective flow field disturbance structures, preventing the solidifying agent from undergoing strong turbulent mixing with the slurry. This not only causes localized clumping of the solidifying agent and significant material waste but also leads to slurry sticking to the bottom in mixing dead zones, ultimately resulting in uneven curing strength of the membrane bag.

[0003] Therefore, in order to combine the flexibility of in-situ treatment with the high efficiency of ex-situ treatment, and to overcome the problems of existing fixed slurry making equipment such as cumbersome process, weak soil breaking capacity, uneven mixing and easy damage to the main shaft, it is urgent to develop a new type of device and supporting process that can be directly mounted on mobile chassis such as excavators and integrates powerful cutting and soil breaking, forced pressure slurry making, and efficient solidification and mixing functions. Summary of the Invention

[0004] The purpose of this invention is to provide a mobile device and construction method for soil crushing, slurry making, and solidification mixing, which solves the technical problems of existing in-situ solidification equipment when operating in mud pits or high-moisture-content pits, such as poor ability to break dry soil, easy damage and breakage of the main shaft, lack of in-situ water diversion and slurry making ability, and uneven mixing of solidifying agent that easily leads to local clumping.

[0005] To achieve the above objectives, the present invention provides the following technical solution: The present solution proposes a mobile device and construction method for original soil crushing, slurry making and solidification mixing, including an external support and protection component, an internal power drive component and a multi-stage mixing and breaking component; wherein, the external support and protection component includes an ear plate, a mounting top plate and a sleeve, the ear plate is fixed above the mounting top plate for connection with external mobile engineering machinery; the sleeve is suspended and connected directly below the mounting top plate.

[0006] Preferably, the top flange of the sleeve is detachably fixed to the mounting plate by bolts.

[0007] Preferably, a plurality of support rods are provided along the axial direction on the inner side wall of the sleeve.

[0008] Preferably, a plurality of water inlets are provided on the upper middle side wall of the sleeve, the water inlets keeping the internal cavity of the sleeve in fluid communication with the external mud pool, so as to introduce external water source for mud exchange and dilution.

[0009] The internal power drive assembly includes a hydraulic motor, an internal support frame, a motor protective cover, and a mechanical seal. The internal support frame is fixedly suspended inside a sleeve below the mounting top plate. The hydraulic motor is installed inside the internal support frame and has a sealed motor protective cover on its outside. A mechanical seal is installed at the lowest output position of the internal support frame.

[0010] Preferably, the multi-stage mixing and breaking assembly includes a bearing shaft, a sliding hub, a flange, a propeller-type mixing blade, a mixing cutter head mounting sleeve, a mixing cutter head, a pilot drill bit, and carbide cutting teeth. The top end of the bearing shaft is coaxially connected to the output end of the hydraulic motor, and its bottom end extends downward to form the bottom opening of the sleeve. The mixing cutter head mounting sleeve is fitted onto the bottom end of the bearing shaft, and the mixing cutter head, which has a hemispherical windmill frame structure, is fixed on the mounting sleeve. Carbide cutting teeth are densely distributed on the water-facing surface and lower edge of the mixing cutter head. The pilot drill bit is located at the bottom center of the mixing cutter head. A propeller-type mixing blade is located in the middle section of the bearing shaft inside the sleeve. The propeller-type mixing blade is fixed on the sliding hub, which is fitted onto the outside of the bearing shaft and is adjusted and locked in position on the bearing shaft by means of the flange.

[0011] This invention also proposes a variable frequency step-by-step construction method for original soil crushing, slurry making, and solidification mixing, which is applied to the above-mentioned mobile device for original soil crushing, slurry making, and solidification mixing, and specifically includes the following steps: Step 1: Earthwork positioning and water diversion into the cavity The mobile engineering machinery is operated to move the device to the work point and press it down, so that the mixing blades come into contact with the dry soil layer to be treated. At the same time, the water inlet of the sleeve is submerged below the surface of the mud pool, and the water in the mud pool is automatically introduced into the sleeve through the water inlet.

[0012] Step 2: Low-speed, high-torque soil breaking and slurry preparation The pilot drill bit at the bottom of the mixing cutter head is positioned and penetrates the soil. The carbide cutting teeth powerfully cut and break up the dry and hard soil clods. Under the agitation of the mixing cutter head, the mud is drawn in from the bottom center and thrown towards the inner wall of the sleeve after being acted upon by the mixing cutter head. Then it flows upward, forming a wide-ranging overall circulation flow. This flow field effectively rolls up the broken soil particles from the bottom and initially mixes them with water to form mud, achieving efficient in-situ mud making.

[0013] Step 3: Equipment lifting and curing agent incorporation After the in-situ soil slurry is saturated to meet the design requirements, the mobile engineering machinery is used to lift the device appropriately, so that the mixing head is detached from the bottom hard soil layer and suspended in the mixed slurry. Then, the specified proportion of solidifying agent is evenly added to the inside of the sleeve or the surface of the slurry through an external pumping system.

[0014] Step 4: High-speed, high-shear curing and mixing The blade tips of the propeller-type mixing blades located in the middle section of the sleeve form a significant high-speed zone, generating strong radial flow and high-speed shearing action. Under the constraint of the sleeve, this high-speed flow field forms a strong axial circulating flow above and below the blades, allowing the upper curing agent to be quickly entrained into the mud body and fully dispersed and sheared. This ensures that the curing agent mixes rapidly and uniformly with the mud throughout the entire outer cylinder space, ultimately forming a homogeneous solidified body that meets construction standards.

[0015] Repeated machine relocation: After the mixing at this station is completed, move the machine to the next station and repeat the above steps.

[0016] The beneficial effects achieved by the present invention using the above structure are as follows: 1. The bottom-exposed mixing cutter head is equipped with carbide cutting teeth and a pilot drill bit, overcoming the problem that conventional blades cannot directly cut hard, dry soil; the internal power components are equipped with an independent support frame, motor guard and mechanical seal, which completely isolates the mud erosion and effectively avoids the risk of motor damage and spindle breakage under complex and harsh working conditions.

[0017] 2. The sleeve design with a water inlet allows the device to automatically introduce free water to participate in the dilution and slurry making of the dry soil during operation in the mud pit; combined with the high-speed propulsion mixing blades that can be adjusted up and down, a downward pressure closed vortex is forcibly formed between the inner cavity of the sleeve and the main shaft, which fundamentally solves the industry pain points such as water and soil segregation, uneven mixing of solidifying agent and local agglomeration caused by traditional open mixing.

[0018] 3. The variable frequency step-by-step operation method of "first breaking the soil and making slurry at low speed and high torque, and then solidifying and mixing at high speed and high shear" perfectly integrates two completely different dynamic and fluid dynamic requirements on a single bearing shaft, realizing continuous operation of soil breaking, slurry making and solidification in one stop on the same machine, which greatly improves construction efficiency.

[0019] 4. The outer anti-splash sleeve adopts a detachable flange bolt design, the height of the middle blade can be adjusted by sliding and locking as needed, and the bottom cutter head is installed through the sleeve for easy replacement after wear. The overall design has both high engineering practical adaptability and convenient maintenance. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention; Figure 2 This is a front view of the present invention; Figure 3 This is a structural diagram of the stirring blade of the present invention; Figure 4 This is a fluid simulation streamline diagram under the low-speed heavy-load crushing and stirring condition of the present invention; Figure 5This is a velocity cloud map of the fluid simulation under the high-speed and high-efficiency curing and stirring conditions of the present invention.

[0021] The components are: 1. Ear plate; 2. Hydraulic motor; 3. Bolt; 4. Support rod; 5. Sleeve; 6. Propeller impeller; 7. Agitator head; 8. Bearing shaft; 9. Water inlet; 10. Motor guard; 11. Internal support frame; 12. Mechanical seal; 13. Flange; 14. Sliding shaft hub; 15. Mounting top plate; 16. Carbide cutting teeth; 17. Mounting sleeve. Detailed Implementation

[0022] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0023] See Figure 1 As shown, the original soil crushing, slurry making, and solidification mixing mobile device of this invention includes the following components in its execution unit: ear plate 1, hydraulic motor 2, bolt 3, support rod 4, sleeve 5, propulsion mixing blade 6, mixing cutter head 7, bearing shaft 8, water inlet 9, motor protective cover 10, internal support frame 11, mechanical seal 12, flange 13, sliding shaft hub 14, mounting top plate 15, carbide cutting teeth 16, and mounting sleeve 17.

[0024] The external support and protective components include ear plates 1, mounting top plates 15, and sleeves 5. Ear plates 1 are fixed above the mounting top plates 15 for attachment to construction machinery such as excavators. Sleeves 5 are suspended below the mounting top plates. During construction, sleeves 5 serve as a protective cover against mud splashing and as a material mixing chamber. To enhance the compressive rigidity of the shell, the inner wall of sleeves 5 is uniformly provided with several support rods 4 along the axial direction to improve structural strength.

[0025] Sleeve 5 is suspended below the mounting plate, and is cylindrical in shape, made of rolled and welded wear-resistant steel plate. During construction, sleeve 5 serves two functions: Firstly, as a protective cover against mud splashing, it confines the mud generated by internal mixing within the sleeve, thus preventing environmental pollution. Secondly, as a material mixing chamber, it provides a closed space for mixing the curing agent, water, and soil. To improve the compressive stiffness of the sleeve 5 under lateral earth pressure and mixing impact, several longitudinally arranged support rods 4 are uniformly welded along the axial direction on the inner wall of the sleeve 5. The support rods 4 are preferably angle steel or square steel, and their two ends abut against the mounting top plate and the bottom flange of the sleeve 5, respectively, forming a truss-type reinforcing structure.

[0026] The sleeve 5 is a detachable structure with a flange welded to its top. This flange is detachably fixed to the mounting plate by multiple sets of high-strength bolts 3 evenly distributed along the circumference. The bolt connection facilitates the overall disassembly of the sleeve 5 for inspection, cleaning, or replacement of the internal power drive components and multi-stage mixing and breaking components. It also facilitates the replacement of sleeves of different lengths or diameters according to different working conditions.

[0027] The upper middle side wall of the sleeve 5 has several water inlets 9. These inlets 9 are evenly distributed along the circumference of the sleeve, and the number can be set from 4 to 8 depending on the water supply requirements. The water inlets 9 essentially form mud exchange channels: when the entire device is immersed in a mud pool or a layer of moisture-rich silt, water from the mud pool can freely flow into the interior of the sleeve 5 through the water inlets 9, ensuring sufficient water for mixing and dilution when cutting dry soil, thus meeting the moisture content requirements for slurry preparation. The edges of the water inlets 9 are equipped with wear-resistant lining rings to prevent the aperture from enlarging due to mud erosion during long-term use.

[0028] The internal power drive assembly is suspended and fixed below the mounting top plate to provide rotational power for the multi-stage mixing and breaking assembly. It includes a hydraulic motor 2, an internal support frame 11, a motor protective cover 10, and a mechanical seal 12.

[0029] The internal support frame 11 is a cage-like or truss-like structure welded from steel profiles. Its top is fixedly connected to the lower surface of the mounting plate by bolts and extends vertically downwards. The internal support frame 11 not only provides a stable mounting base for the hydraulic motor 2, but its frame gaps also ensure the vertical flow of mud.

[0030] The hydraulic motor 2 is installed in the internal cavity of the internal support frame 11. The hydraulic motor 2 was chosen as the power source because it has advantages such as small size, high power density, strong overload capacity, and stepless speed regulation, making it particularly suitable for long-term heavy-duty operation in muddy and watery environments. The hydraulic oil pipe (not shown in the figure) of the hydraulic motor 2 is led out from the mounting top plate and connected to the hydraulic system of the construction machinery.

[0031] At the bottom output end of the internal support frame 11, i.e., where the output shaft of the hydraulic motor 2 passes through the motor protective cover 10, a protective mechanical seal 12 is provided. The mechanical seal 12 is a mechanical sealing device, including a dynamic ring, a stationary ring, and a spring compensation mechanism, which can effectively prevent high-concentration mud in the sleeve 5 from entering the transmission system and the motor interior along the output shaft, thereby ensuring the long-term reliable operation of the power components under harsh working conditions.

[0032] The multi-stage mixing and breaking assembly includes a bearing shaft 8, a sliding hub 14, a flange 13, a propeller-type mixing blade 6, a mixing cutter head mounting sleeve 17, a mixing cutter head 7, and carbide cutting teeth 16. The assembly is divided into two stages: the lower stage, primarily composed of the mixing cutter head 7, is used for cutting and breaking hard soil; the upper stage, primarily composed of the propeller-type mixing blade 6, is used for mixing the solidifying agent and the slurry.

[0033] The bearing shaft 8 is a high-strength solid or thick-walled hollow steel shaft, the top of which is connected to the output shaft of the hydraulic motor 2 and is equipped with an axial positioning device.

[0034] The mixing cutter head mounting sleeve 17 is fitted and fixed to the bottom end of the bearing shaft 8, typically using welding or an interference fit with radial pins for locking. The mixing cutter head 7 is fixed to the mounting sleeve 17. The mixing cutter head 7 has a hemispherical windmill frame structure, meaning that multiple curved cutter arms radiate outward from a central hub, forming a three-dimensional profile similar to windmill blades. This structure reduces rotational resistance and generates a downward axial thrust during rotation, promoting chip removal.

[0035] Carbide cutting teeth 16 are densely welded onto the water-facing side (i.e., the leading edge of the rotating cutter) and the lower edge (i.e., the bottom in contact with the hard soil layer) of the mixing cutter head 7. The carbide cutting teeth 16 have extremely high hardness and wear resistance, and are specifically designed for cutting compacted hard soil, clay, and even soft rock, significantly improving soil breaking efficiency and extending the life of the cutter head. A pilot drill bit (not shown in the figure) is also provided at the center of the bottom of the mixing cutter head 7.

[0036] The propeller-type agitator blade 6 is positioned in the middle section of the bearing shaft 8 inside the sleeve 5 (i.e., above the agitator head 7). The propeller-type agitator blade 6 is fixed to the sliding hub 14, which is a cylindrical hub whose inner diameter slides into the outer diameter of the bearing shaft 8. The sliding hub 14 is fitted onto the outside of the bearing shaft 8 and its vertical position can be adjusted and locked via the flange 13. Specifically, the flange 13 can be a split-type positioning and locking ring, whose inner ring grips the journal of the bearing shaft 8 and simultaneously abuts against the end face of the sliding hub 14. Loosening the bolts of the flange 13 allows the sliding hub 14 to move axially, adjusting the height of the propeller-type agitator blade 6 within the sleeve 5; after adjustment, locking the flange 13 fixes the blade in the desired position. This adjustable structure allows the device to adapt to the mixing requirements of mud at different depths. When the sleeve 5 is inserted into the mud layer to a greater depth, the blades can be adjusted downwards; when the depth is shallower, they can be adjusted upwards to ensure that the blades are always in the optimal mixing zone.

[0037] The propeller-type agitator blades 6 are typically designed with 2 to 3 blades, each with a helical curved surface and an inclination angle (relative to the horizontal plane) of 30° to 45°. During rotation, the propeller-type agitator blades 6 generate a downward axial flow, which flows back after hitting the bottom, lifting the slurry upwards. Simultaneously, a radial flow is generated, promoting thorough mixing of the solidifying agent and the slurry. Its core function is to ensure that the water added from the inlet 9, the solidifying agent added from the top of the sleeve 5, and the slurry cut upwards from below form a strong turbulent mixture inside the sleeve 5, thereby achieving a uniform and rapid slurry preparation and solidification reaction.

[0038] This invention also proposes a variable frequency step-by-step construction process based on the above-mentioned device, which adopts different speeds for segmented operation to meet the different kinetic requirements of cutting and pulping and hardener mixing. Specifically, it includes the following steps: S1: Earthwork positioning and water diversion into the cavity The mobile construction machinery is used to move the device to the work site and press it down, so that the mixing head 7 contacts the dry soil layer to be treated. At the same time, the water inlet 9 of the sleeve 5 is submerged below the surface of the mud pool, and the water in the mud pool is introduced into the sleeve 5 through the water inlet 9.

[0039] S2: Low-speed, high-torque soil breaking and pulping Start hydraulic motor 2 to drive the bearing shaft 8 to rotate at low speed. This initiates the pulping stage. Specific operating parameters and actions are as follows: Motor speed control: 50~100 r / min.

[0040] Operating Mechanism: Using a low-speed, high-torque mode, the pilot drill bit at the bottom of the mixing head 7 is positioned and penetrates the soil. The carbide cutting teeth 16 powerfully cut and break up the dry, hard soil clumps. The simulated flow field state during this step is shown in the attached figure. Figure 4 As shown in the streamline diagram, the fluid movement is mainly concentrated in the lower region of the device. Under the agitation of the stirring head 7, the slurry is drawn in from the bottom center, thrown towards the inner wall of the sleeve 5 after being acted upon by the stirring head 7, and then flows upward, forming a wide-ranging overall circulating flow. This flow field effectively picks up the broken soil particles from the bottom and initially mixes them with water to form slurry, achieving efficient in-situ slurry making.

[0041] S3: Equipment upgrade and curing agent incorporation After the in-situ soil slurry has reached the design requirements, the mobile engineering machinery is used to raise the device appropriately, so that the mixing cutter head 7 detaches from the bottom hard soil layer and is suspended in the mixed slurry. Subsequently, the specified proportion of solidifying agent is evenly added to the inside of the sleeve 5 or the surface of the slurry through an external pumping system.

[0042] S4: High-speed, high-shear curing and mixing Adjust the operating frequency of hydraulic motor 2 to drive the bearing shaft 8 to rotate at high speed. At this point, the curing agent mixing stage begins. Specific operating parameters and actions are as follows: Motor speed control: 300~500r / min.

[0043] Operating Mechanism: The velocity contour map of the flow field under this condition is attached. Figure 5 As shown. Under high-speed rotation, a significant high-speed zone (bright area in the figure) is formed at the tip of the propeller-type mixing blade 6 located in the middle section of sleeve 5, generating strong radial flow and high-speed shearing action. This high-speed flow field, constrained by sleeve 5, forms a strong axial circulating flow above and below the blade, allowing the upper curing agent to be quickly entrained into the mud body and fully dispersed and sheared. This ensures that the curing agent mixes rapidly and uniformly with the mud throughout the entire outer cylinder space, ultimately forming a homogeneous solidified body that meets construction standards. After mixing at this station is completed, the machine is moved to the next station, and steps S1-S4 are repeated.

[0044] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, material, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, material, or apparatus.

[0045] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A mobile device for crushing, slurry making, and solidifying soil, characterized in that, It includes an external support and protection assembly, an internal power drive assembly, and a multi-stage mixing and breaking assembly. The external support and protection assembly includes ear plates, a mounting top plate, and a sleeve. The ear plate is fixed above the mounting top plate and is used to connect with external mobile construction machinery. The sleeve is suspended and connected directly below the mounting top plate; The top flange of the sleeve is detachably fixed to the mounting plate by bolts. Several support rods are provided along the axial direction on the inner side wall of the sleeve.

2. The mobile device for original soil crushing, slurry making, and solidification mixing according to claim 1, characterized in that, The upper middle side wall of the sleeve has several water inlets, which keep the internal cavity of the sleeve in fluid communication with the external mud pool to introduce external water source for mud exchange and dilution.

3. The mobile device for original soil crushing, slurry making, and solidification mixing according to claim 1, characterized in that, The internal power drive assembly includes a hydraulic motor, an internal support frame, a motor protective cover, and a mechanical seal; the internal support frame is fixedly suspended inside a sleeve below the mounting top plate.

4. The mobile device for original soil crushing, slurry making, and solidification mixing according to claim 3, characterized in that, The hydraulic motor is installed inside the internal support frame, and a sealed motor protective cover is provided on its outside; an organic seal is installed at the lowest output position of the internal support frame.

5. The mobile device for original soil crushing, slurry making, and solidification mixing according to claim 1, characterized in that, The multi-stage mixing and soil breaking assembly includes a bearing shaft, a sliding shaft hub, a flange, a propulsion mixing blade, a mixing cutter head mounting sleeve, a mixing cutter head, and carbide cutting teeth.

6. The mobile device for original soil crushing, slurry making, and solidification mixing according to claim 5, characterized in that, The top end of the bearing shaft is coaxially connected to the output end of the hydraulic motor, and its bottom end extends downward to form the bottom opening of the sleeve.

7. The mobile device for original soil crushing, slurry making, and solidification mixing according to claim 5, characterized in that, The bottom end of the bearing shaft is fitted with a stirring cutter head mounting sleeve. The stirring cutter head, which has a hemispherical windmill frame structure, is fixed on the mounting sleeve. The water-facing surface and lower edge of the stirring cutter head are densely distributed with carbide cutting teeth. A pilot drill bit is also provided at the bottom center of the stirring cutter head.

8. The mobile device for original soil crushing, slurry making, and solidification mixing according to claim 5, characterized in that, A propulsion stirring blade is provided in the middle section of the bearing shaft located inside the sleeve. The propulsion stirring blade is fixed on the sliding shaft hub, which is sleeved on the outside of the bearing shaft and is adjusted and locked in position on the bearing shaft by means of a flange.

9. A construction method for crushing, preparing, and solidifying original soil, characterized in that, The mobile device for original soil crushing, slurry making, and solidification mixing, applied to any one of claims 1 to 8, comprises the following steps: S1: Earthwork positioning and water introduction into the cavity. The mobile engineering machinery is operated to move the device to the work point and press down, so that the mixing head contacts the dry soil layer to be treated. At the same time, the water inlet of the sleeve is submerged below the surface of the mud pool. The water in the mud pool is automatically introduced into the inside of the sleeve through the water inlet. Low-speed, high-torque soil breaking and slurry making. The pilot drill bit at the bottom of the mixing head is positioned and penetrates the soil. The carbide cutting teeth perform powerful cutting and crushing of dry and hard soil blocks. Under the agitation of the mixing head, the mud is sucked in from the bottom center. After being acted upon by the mixing head, it is thrown towards the inner wall of the sleeve and then flows upward, forming a wide-ranging overall circulation flow. This flow field effectively rolls up the crushed soil particles from the bottom and mixes them with water to form mud, achieving efficient in-situ slurry making. S2: After the equipment is lifted and the curing agent is added, and the in-situ soil slurry reaches the design requirements, the mobile engineering machinery is operated to lift the device appropriately, so that the mixing head is separated from the bottom hard soil layer and suspended in the mixed mud. Then, the specified proportion of curing agent is evenly added to the inside of the sleeve or the surface of the mud through the external pumping system. S3: High-speed high-shear solidification and mixing. The blade tip of the propeller-type mixing blade located in the middle section of the sleeve forms a significant high-speed zone, generating strong radial flow and high-speed shearing action. Under the constraint of the sleeve, this high-speed flow field forms a strong axial circulation flow above and below the blade, which allows the upper solidifying agent to be quickly entrained into the mud body and fully dispersed and sheared, ensuring that the solidifying agent is quickly and uniformly mixed with the mud in the entire outer cylinder space, ultimately forming a homogeneous solidified body that meets the construction standards. S4: After the mixing at this station is completed, move the machine to the next station and repeat the above steps.

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