In-situ solidification mixing equipment and construction method

Abstract

This invention provides an in-situ curing mixing device and construction method, relating to the field of underground construction machinery and equipment technology. The device includes a mounting support plate, an extension arm, a mixing head, an oil circuit system, and a delivery pipeline system. The mounting support plate is located at the top of the in-situ curing mixing device. The extension arm connects the mounting support plate to the mixing head. At least two mixing heads are positioned at a certain angle at the bottom of the in-situ curing mixing device. The mixing heads are driven to rotate by the oil circuit system. Each mixing head has a nozzle installed on the inner side of its fixed mixing blades. The delivery pipeline system is fixedly installed on the in-situ curing mixing device to provide curing agent powder / slurry and high-pressure gas. The advantages of this invention are that the mixing device adopts a novel blade structure and utilizes the oil circuit system to monitor the rotation frequency of the mixing head. Furthermore, the nozzles are designed with appropriate positions and structures, thereby effectively ensuring high-quality and uniform mixing of the curing agent and soil in situ.

Description

Technical Field

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

[0002] In-situ shallow soil stabilization is a novel soil treatment technology. Its essence lies in using a stabilizing agent to directly solidify soft soils such as silt in situ. The main goal of this technology is to enhance the strength and stability of soft soil sites, enabling the reuse of sites previously considered abandoned for subsequent construction of buildings and transportation facilities. In this foundation treatment process, the stabilizing agent is mixed with silt / clay, and through a series of complex physical and chemical reactions, the silt / clay layer is transformed into a new base layer with stable bearing capacity. This meets the needs of various engineering constructions and achieves efficient resource utilization of abandoned land. In-situ shallow soil stabilization technology has significant advantages, not only achieving zero waste soil disposal and resource conservation, but also improving the strength of the foundation soil to meet the bearing capacity requirements of engineering projects. Furthermore, this technology is environmentally friendly and widely applicable, suitable for multiple fields and different soil layers, improving foundation stability and extending service life.

[0003] The following issues need to be addressed when using this technology:

[0004] 1. Existing mixing equipment often has a single-layer structure for its mixing blades, and the blade structure is simple. During mixing, the soil is not disturbed enough, making it difficult to ensure that the soil and the solidification material are mixed evenly, resulting in the reinforcement effect failing to meet the design requirements.

[0005] 2. Existing mixing equipment typically has curing agent nozzles located at the base of the mixing head, using circular nozzles. When the curing agent is sprayed, it cannot reach the effective mixing range, and there is no relevant protection. During the mixing operation, the nozzles are prone to blockage, which prevents the curing agent from being injected into the ground in the preset amount. This may pose a potential threat to the construction quality and make it difficult to guarantee the project quality.

[0006] 3. The current mixing equipment cannot determine the number of times the mixing blades will mix during construction, and there are currently no technical means or devices to accurately measure the real-time rotation speed of the mixing head. This may lead to uneven mixing during construction, which will seriously affect the project quality and construction effect. Summary of the Invention

[0007] In view of the characteristics and technical problems of existing in-situ solidification mixing equipment, this invention proposes an in-situ solidification mixing equipment. This mixing equipment adopts a structure in which fixed mixing blades and active mixing blades cooperate and cut each other, and uses an oil circuit system to monitor the number of rotations of the mixing head. At the same time, the position of the nozzle is changed, which effectively ensures the uniform mixing of the solidifying agent and the soil in situ.

[0008] To achieve the objectives of this invention, the following technical solutions are adopted:

[0009] An in-situ curing and mixing device includes a mounting support 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 mounted on the mounting support plate, and multiple mixing heads are arranged circumferentially at intervals at the lower end of the extension arm. Each mixing head includes a fixed mixing part and a rotating mixing part. The fixed mixing part is fixedly mounted at the lower end of the extension arm, and the rotating mixing part is rotatably connected to the fixed mixing part. A plurality of fixed mixing blades are arranged circumferentially at intervals on the outer peripheral wall of the fixed mixing part, and a plurality of active mixing blades are arranged circumferentially at intervals on the outer peripheral wall of the rotating mixing part, with the fixed mixing blades and active mixing blades being staggered and mutually cutting each other. At least one fixed mixing blade on each mixing head has a nozzle on its inner side. The oil circuit system and the delivery pipeline system are respectively mounted on the extension arm. The oil circuit system is connected to the rotating mixing part and is used to drive the rotating mixing part to rotate, while simultaneously calculating and recording the number of rotations by the amount of oil flowing through it. The delivery pipeline system is connected to the nozzles and is used to spray the solidified material and high-pressure gas from the nozzles. This equipment increases mixing force and uniformity through multiple mixing heads. It further enhances mixing capacity by using fixed and active mixing blades to cut each other. The oil circuit system records the number of rotations of the mixing heads, and the construction rotation data control ensures the mixing quality of the curing agent and soil in situ. Finally, the delivery pipeline system and nozzles work together to prevent clogging during the mixing operation and ensure project quality.

[0010] Preferably, the stirring fixing part is a fixed support; the fixed support is fixedly disposed at the lower end of the extension arm, and the fixed stirring blades are arranged circumferentially on the outer peripheral wall of the fixed support; the stirring rotating part includes a rotating shaft, a rotating shell, and a rotating drive component; the rotating drive component is disposed inside the fixed support and provides rotational power, the rotating shell is rotatably connected to the fixed support through the rotating shaft, and the rotating shaft is fixedly connected to the drive part of the rotating drive component; the active stirring blades are arranged circumferentially on the outer peripheral wall of the rotating shell. In the above structure, the fixed support connects the rotating shell through the rotating shaft, and the rotating drive component is enclosed inside the rotating shell to drive the stirring head to rotate.

[0011] Preferably, the rotating outer shell has end cutters arranged at intervals along its circumference; a cover plate is provided on the bottom surface of the rotating outer shell; several ribs are arranged along the diameter of the cover plate; the ribs protrude 3-5 cm from the cover plate. This structure, through the rotation of the active mixing blades on the rotating outer shell and the end cutters during mixing, is responsible for cutting the soil and performing the main mixing action; the rotating drive component, enclosed inside the rotating outer shell, drives the mixing head to rotate; the cover plate seals the rotating outer shell, while the ribs on the cover serve to assist in mixing and reinforce the structure. The protruding structure of the ribs generates shearing action on the soil from another dimension during the rotation of the mixing head, ensuring that the edges of the mixing area are effectively agitated in each operation, preventing missed mixing and ensuring that the overlap between multiple operations meets construction requirements.

[0012] Preferably, both the active mixing blade and the fixed mixing blade include a vertical plate and a horizontal plate, with at least one layer of horizontal plates. The vertical plate of the active mixing blade is fixedly mounted on the rotating outer shell, and the vertical plate of the fixed mixing blade is fixedly mounted on a fixed support. The active and fixed mixing blades are arranged opposite to each other, creating an overlapping cutting area between the horizontal plates of the active and fixed mixing blades. Furthermore, the horizontal plates of the active and fixed mixing blades are staggered in layered arrangement. This structure, through the combination of vertical and horizontal plates in the active and fixed mixing blades, and the staggered arrangement of the two sets of blades, achieves a similar shearing effect during mixing, resulting in more uniform mixing of the curing agent and the soil.

[0013] Preferably, the nozzle is located inside the vertical plate of the fixed mixing blade. The nozzle head is a constricted frustum shape, meaning the diameter of the nozzle head gradually decreases from the inside to the outside. The nozzle head has both horizontal and vertical slit-like nozzles, or a circular nozzle at the constricted end. This structure, with the slit-like nozzles on the isosceles trapezoidal nozzle, facilitates better atomization of the curing agent. Using a constricted circular nozzle ensures the curing agent spraying speed, delivering the curing agent to a distant mixing position. The nozzle being hidden inside the fixed mixing blade prevents clogging due to excessive soil pressure during descent and lifting, ensuring a continuous and stable output of curing agent and high-pressure gas.

[0014] Preferably, the angle between the horizontal plate and the tangent direction of the rotating outer shell is 15° to 30°. This structure, by controlling the angle of the horizontal plate, further ensures the efficiency and uniformity of the stirring process.

[0015] 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 stirring rotating part of each stirring head via a first drive oil pipe. The stirring rotating part 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. This structure circulates the hydraulic system oil through the inlet and outlet pipes. 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 rotating drive component 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 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.

[0016] 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, or high-pressure gas according to different construction requirements; 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 above structure primarily delivers curing agent slurry or dry powder through channel one, allowing selection of different curing agent delivery methods according to different construction requirements; the high-pressure gas in channel two reduces mixing resistance during mixing and also helps to ensure uniform distribution of the curing agent.

[0017] Preferably, the system also includes a material supply backend and a construction carrier, connected to the conveying pipeline system via a material supply pipe and a gas supply pipe. The material supply backend provides curing agent and auxiliary high-pressure gas for curing and mixing. A connecting plate with pin holes is provided on the mounting support plate, through which a pin passes to fix the mounting support plate to the construction carrier. The extension arm is a hollow structure, with reinforcing ribs at the connection point between the extension arm and the mounting support plate. This structure uses the mounting base plate as the connection between the in-situ curing mixing equipment and the construction carrier. The pin hole and pin shaft connection method is relatively universal, facilitating the combination of the in-situ curing mixing equipment with different types of construction carriers. Furthermore, the construction carrier can be rationally selected according to different construction environments.

[0018] An in-situ curing mixing device and construction method, the application of the above-mentioned in-situ curing mixing device includes the following steps:

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

[0020] (b) Fix the in-situ curing and mixing equipment to the front end of the excavator or other construction carrier through connecting plates, pins and pin holes; connect the valves, controllers and oil pipes in 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 curing and mixing through the gas supply pipe. When the curing agent material and high-pressure gas are transported to the mixing head, the soil mixing construction begins.

[0022] (d) During the on-site mixing process, depending on the moisture content of the original soil and the form of the curing agent, a vertical mixing and curing method is adopted. The mixing equipment is vertically inserted into the soil in place for mixing. The active mixing blades on the mixing head rotate in the forward direction, while the fixed mixing blades on the mixing head remain stationary. The two sets of blades can achieve the effect of staggered mixing during the mixing operation. During the construction, the mixing is gradually deepened and the curing agent material and high-pressure gas are continuously sprayed until the designed curing depth is reached. In order 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 the reverse rotation spraying and lifting operation is carried out until the mixing head is completely lifted out of the ground, thus completing the mixing operation.

[0023] (e) Move to the next work position and repeat the construction steps (d) to carry out the next work. 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 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 that by optimizing the structure of the mixing blades on the mixing head, a staggered mixing effect of fixed and active mixing blades is achieved, which significantly improves the uniformity and efficiency of mixing the curing agent and soil, thereby enhancing the quality of foundation soil solidification treatment. The rotation direction of the mixing head is controlled by a control valve, and the number of mixing cycles is closely monitored using a flow meter, allowing for the development of specific construction measures and requirements to ensure stable and reliable work quality in each construction area. Furthermore, adjusting the position and angle of the curing agent nozzles effectively prevents nozzle clogging, resulting in more uniform curing agent spraying. Simultaneously, by setting up a second channel, high-pressure gas can effectively reduce resistance during the mixing process, which not only facilitates the mixing operation but also promotes smooth flow and uniform mixing of the curing agent within the soil, further improving project quality and construction efficiency. Attached Figure Description

[0026] Figure 1 This is a front view of the in-situ curing and stirring equipment according to Embodiment 1 of the present invention.

[0027] Figure 2 This is a front view of the in-situ curing and stirring equipment according to Embodiment 2 of the present invention.

[0028] Figure 3 This is a front view of the in-situ curing and stirring equipment according to Embodiment 3 of the present invention.

[0029] Figure 4 This is a front view of the single-sided stirring head structure according to Embodiment 1 of the present invention.

[0030] Figure 5 This is a front view of the single-sided stirring head structure in Embodiment 2 of the present invention.

[0031] Figure 6 This is a front view of the single-sided stirring head structure in Embodiment 3 of the present invention.

[0032] Figure 7 This is a side view of the single-sided stirring head structure according to Embodiment 1 of the present invention.

[0033] Figure 8 This is a side view of the single-sided stirring head structure in Embodiment 2 of the present invention.

[0034] Figure 9 This is a cross-sectional view of the stirring head structure of the present invention.

[0035] Figure 10 This is a schematic diagram of the blade structure of the present invention.

[0036] Figure 11 This is a schematic diagram of the nozzle structure of the present invention.

[0037] Figure 12 This is a schematic diagram of the nozzle structure of the present invention.

[0038] Figure 13 This is a schematic diagram of the construction of the present invention.

[0039] Explanation of reference numerals in the attached figures:

[0040] 1. Mounting support plate; 11. Pin shaft; 12. Connecting plate; 13. Pin hole; 2. Extension arm; 21. Rib plate; 22. Fixed support; 3. Stirring head; 31. Active stirring blade; 32. Fixed stirring blade; 331. Vertical plate; 332. Horizontal plate; 333. Overlapping cutting area; 34. End cutter head; 35. Rotating shaft; 36. Rotating outer shell; 37. Rotating drive component; 38. Cover plate; 39. Rib plate; 4. Oil circuit system; 41. Oil inlet valve; 42. 43. Oil outlet valve; 44. Control valve; 45. Hydraulic flow meter; 46. Oil inlet pipe; 47. Oil outlet pipe; 48. First drive oil pipe; 49. Second drive oil pipe; 50. Conveying pipeline system; 51. Mixing zone; 52. Channel 1; 53. Channel 2; 54. Nozzle; 55. Nozzle head; 56. Horizontal slit nozzle; 57. Vertical slit nozzle; 68. Circular nozzle; 79. Material supply backstage; 60. Material supply pipe; 61. Air supply pipe; 70. Construction carrier. Detailed Implementation

[0041] 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.

[0042] 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.

[0043] 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.

[0044] Example 1

[0045] The following is combined with Figure 1 , Figure 4 , Figure 7 , Figures 9-13 The present invention will be further described and illustrated below.

[0046] The engineering background of this embodiment is a factory construction project in a coastal area. The site has a generally distributed thick layer of silt, with some areas directly exposed at the surface. This layer is characterized by high water content, low strength, and high compressibility. The silt layer is gray or grayish-black, composed of clay particles, has an odor, contains organic matter and shell fragments, is soft, has a smooth cut surface, and contains some sand particles at the top. It is saturated and fluid. To meet the bearing capacity requirements of construction machinery such as pile drivers at the factory site, shallow foundation consolidation treatment is required for the soft soil layer. The consolidation depth is 2.5m. Due to the high water content of the silt, a dry spraying method is used. The consolidating agent is PO 42.5 cement, with an addition rate of 120kg / m³. 3 .

[0047] like Figure 1 As shown, the in-situ solidification mixing equipment used in this embodiment includes a mounting support 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 mounted on the mounting support plate 1. In this embodiment, three mixing heads 3 are used, and the three mixing heads 3 are arranged at equal intervals along the circumference at the lower end of the extension arm 2. Each mixing head 3 includes a mixing fixing part and a mixing rotating part. The mixing fixing part is fixedly mounted at the lower end of the extension arm 2, and the mixing rotating part is rotatably connected to the mixing fixing part. Several fixed mixing blades 32 are arranged at intervals along the circumference on the outer peripheral wall of the mixing fixing part, and the mixing rotating part... Several active stirring blades 31 are arranged circumferentially on the outer wall, and the fixed stirring blades 32 are staggered with the active stirring blades 31 to achieve mutual cutting. Each stirring head 3 has at least one nozzle 53 on the inner side of the fixed stirring blade 32. An oil circuit system 4 and a conveying pipeline system 5 are respectively installed on the extension arm 2. The oil circuit system 4 is connected to the stirring rotating part and is used to drive the stirring rotating part to rotate. The number of rotations of the stirring head is calculated by the amount of oil flowing through it and recorded. The conveying pipeline system 5 is connected to the nozzles 53, and the conveying pipeline system 5 sprays the solidified material and high-pressure gas out of the nozzles 53. This equipment increases the stirring force and uniformity through the three stirring heads 3. The mutual cutting between the fixed stirring blades 32 and the active stirring blades 31 enhances the stirring capacity. Furthermore, the oil circuit system 4 can calculate the number of rotations of the stirring heads 3, ensuring the quality of in-situ mixing of the solidifying agent and soil through specific rotation data. Finally, the concealed design of the nozzles 53 prevents clogging during mixing operations, ensuring project quality.

[0048] like Figure 1 , Figure 13As shown, the mounting support plate 1 is connected to the excavator boom via pin 11 and pin hole 13. The excavator model is at least 220. The excavator is used to operate the in-situ solidification mixing equipment to mix the solidified soil vertically up and down.

[0049] like Figure 1 As shown, the extension arm 2 has a hollow structure, which effectively reduces the weight of the equipment. Ribs 21 are installed at the mounting support plate 1 for reinforcement. The extension arm 2 is 5m long, which can ensure that the effective reinforcement depth meets the design requirements. The fixed support 22 is located at the bottom of the extension arm 2. There are three fixed supports 22. The fixed supports 22 and the extension arm 2 can be integrally formed or have a separate structure. Each fixed support 22 is equipped with a stirring head 3. The included angle between the three fixed supports 22 is 130° and they are symmetrically arranged along the extension arm 2. Multiple fixed stirring blades 32 are set on the outer circumference of the end disc of the fixed support 22 and are evenly distributed. A total of 5 sets of fixed stirring blades 32 are set.

[0050] like Figure 1 , Figure 4 and Figure 7 As shown, in this embodiment, the stirring head 3 includes active stirring blades 31, fixed stirring blades 32, end cutters 34, a rotating shaft 35, a rotating outer shell 36, a rotating drive component 37, a cover plate 38, and a rib plate 39. The rotating outer shell 36 is fixed to the fixed support 22 via the rotating shaft 35 and is the core device of the in-situ solidification stirring equipment. Active stirring blades 31 that rotate synchronously are arranged at equal intervals along the circumference of the rotating outer shell 36. A total of 5 sets of active stirring blades 31 are arranged. The active stirring blades 31 are located outside the circumference of the fixed stirring blades 32, forming an inner and outer double structure. The rotating housing 36 features a layered blade structure. Two sets of end cutters 34 are vertically arranged on the outer periphery of the rotating housing 36, protruding 4cm from the surface of the housing. The active mixing blades 31 on the rotating housing 36, in conjunction with the end cutters 34, rotate during the mixing process, responsible for cutting the soil and performing the primary mixing action. The rotation drive 37 is a hydraulic motor, installed inside the rotating housing 36 to drive the mixing head 3 to rotate. The outermost part of the rotating housing 36 is sealed by a cover plate 38, on which a ridge plate 39 is provided for auxiliary mixing and structural reinforcement. The ridge plate 39 protrudes 3cm from the surface of the cover plate 38. This protruding structure of the ridge plate 39 shears the soil from another dimension during the rotation of the mixing head 3, ensuring effective mixing at the edges of the mixing area in each operation, preventing missed mixing, and ensuring that the overlap between multiple operations meets construction requirements.

[0051] like Figure 10As shown, both the active stirring blade 31 and the fixed stirring blade 32 include a vertical plate 331 and at least one horizontal plate 332. In this embodiment, both the fixed stirring blade 32 and the active stirring blade 31 have a single horizontal plate 332. The vertical plate 331 of the active stirring blade 31 is fixedly mounted on the rotating outer shell 36, and the vertical plate 331 of the fixed stirring blade 32 is fixedly mounted on the fixed support 22. The angle between the horizontal plate 332 on the active stirring blade 31 and the fixed stirring blade 32 and the tangent direction of the rotating outer shell 36 is 25°. By controlling the angle of the horizontal plate 332, the stirring efficiency and the uniformity of stirring can be further improved. The active stirring blade 31 and the fixed stirring blade 32 are arranged opposite to each other, so that an overlapping cutting area 333 is formed between the horizontal plate 332 of the active stirring blade 31 and the horizontal plate 332 of the fixed stirring blade 32; and the horizontal plate 332 of the active stirring blade 31 and the horizontal plate 332 of the fixed stirring blade 32 are distributed in a double layer. The staggered arrangement of the two sets of blades can achieve a similar shearing effect during the mixing process, making the curing agent and soil more evenly mixed.

[0052] like Figure 9 As 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 stirring and rotating part of each stirring head 3 through a first drive oil pipe 461. The stirring and rotating part 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 at the end of the oil circuit system. 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.

[0053] like Figure 1 , Figure 11 , Figure 12As shown in (a), 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, dry construction is adopted. Channel one 51 is used for cement dry powder to pass through, and channel two 52 is connected to the air supply pipe 62 of the external material supply backend 6 to transport 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, and the included angle between two adjacent nozzles 53 is the same as the included angle between two adjacent stirring heads 3. The nozzle 531 of each nozzle 53 is frustum-shaped, that is, the diameter of the nozzle 531 gradually decreases from the inside to the outside. The nozzle 531 has two aligned horizontal slit-shaped nozzles 54 and one vertical slit-shaped nozzle 55, which are used to supply material and air into the soil. The nozzle 53 is hidden inside the fixed mixing blade 32, which can prevent the nozzle from being blocked due to excessive soil pressure during the sinking and lifting process, and ensure a continuous and stable output of cement powder and high-pressure gas.

[0054] like Figure 13 As 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 is used to provide curing agent and auxiliary high-pressure gas for curing and mixing. The mounting support plate 1 and the construction carrier 7 are fixedly connected by a pin shaft 11 passing through the pin hole 13.

[0055] like Figure 13 As shown, the construction method of the in-situ solidification mixing equipment in this embodiment is as follows:

[0056] (a) Before construction, the planned solidification treatment area is laid out and the construction area is divided. If there are areas with large cross-sectional changes, the treatment blocks can be adjusted accordingly to facilitate construction.

[0057] (b) The in-situ curing and mixing equipment is fixed to the front end of the excavator or other construction carrier 7 via 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 backend 6 via the material supply pipe 61 and the air supply pipe 62 to provide cement and auxiliary high-pressure gas for curing and mixing.

[0058] (c) After the construction equipment is in place, the material supply back-end 6 begins to transport cement powder by pneumatic conveying through the material supply pipe 61 using high-pressure gas. At the same time, the material supply back-end 6 begins to provide high-pressure gas for curing and mixing through the air supply pipe 62. When the curing agent material and high-pressure gas are transported to the mixing head 3, the soil mixing construction begins.

[0059] (d) During the on-site mixing process, depending on the moisture content of the original soil and the form of the curing agent, a vertical mixing and curing method is adopted. The mixing equipment is vertically inserted into the soil in place for mixing. The active mixing blades 31 on the mixing head 3 rotate in the forward direction with the rotating outer shell 36, while the fixed mixing blades 32 on the mixing head 3 remain stationary. The two sets of blades can achieve the effect of staggered mixing during the mixing operation. During the construction, the mixing is gradually deepened and the curing agent material and high-pressure gas are continuously sprayed until the designed curing depth is reached. In order to ensure the bottom mixing effect, the speed of the mixing equipment is appropriately slowed down when it is close to the bottom and it stays at the bottom for at least 10 seconds before the reverse rotation spraying and lifting operation is carried out until the mixing head 3 is completely lifted out of the ground. The mixing operation is then completed.

[0060] (e) Move to the next work position and repeat step (d) to carry out the work. During the construction process, ensure that the overlap width between the two work areas is not less than 5cm.

[0061] (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.

[0062] Example 2

[0063] The following is combined with Figure 2 , Figure 5 , Figures 8-11 , Figure 12 (b) and Figure 13 The present invention will be further described and illustrated below.

[0064] The engineering background of this embodiment is an industrial park construction project near a river. Since the proposed site was originally a fish and crab farm, the surface layer is a silt layer, and the underlying layer is a deep soft soil layer. The silt layer contains organic matter and humus; the soft soil layer has high water content, low bearing capacity, and high compressibility. To ensure that construction machinery, such as excavators and loaders, can move and work normally on the site, it is necessary to reinforce the soft soil foundation. The reinforcement depth is set at 5 meters. Given the high water content of the soft soil, we choose the wet spraying method, using KD curing agent at a mixing ratio of 100 kg / m³.

[0065] The in-situ solidification and stirring equipment used in this embodiment is similar to that in Embodiment 1, except that:

[0066] Since the reinforcement depth in this project is 5m, the total length of the extension arm 2 in the mixing equipment is 7m, and the maximum working depth can reach 6m. Two mixing heads 3 are provided at the end of the equipment, with an included angle of 135° between them and arranged symmetrically. Four sets of fixed mixing blades 32 and active mixing blades 31 are provided, respectively arranged on the fixed support 22 and the rotating outer shell 36. The horizontal plate 332 of the active mixing blade 31 is located inside the horizontal plate 332 of the fixed mixing blade 32, with a protrusion height of 25cm. Each blade contains one layer of horizontal plate 332. The two form a double-layer blade structure and create a staggered mixing effect; the end blades 34 are provided with 4 sets, protruding 5cm from the surface of the rotating outer shell 36; the ribs 39 on the cover plate 38 protrude 5cm from the surface of the cover plate; the angle between the cross plate 332 of the active mixing blade 31 and the fixed mixing blade 32 and the tangent direction of the circular rotating outer shell 36 is 20°; the channel 51 in the conveying pipeline system 5 is used for conveying the curing agent slurry, and nozzles 53 are respectively provided in the inner layer of the fixed mixing blades 32 of the two mixing heads 3, and the nozzles on the nozzles 531 adopt the following... Figure 12 (b) Constricted circular nozzle 56.

[0067] The construction method in this embodiment is the same as in Embodiment 1, and will not be repeated here.

[0068] Example 3

[0069] like Figure 3 , Figure 6 As shown, in this embodiment, the reinforcement depth is 4.5m, the total length of the extension arm 2 and the stirring head 3 of the stirring equipment is 5.5m, and two stirring heads 3 are used at the end of the equipment, which are symmetrically arranged with an included angle of 140° between them; three sets of fixed stirring blades 32 and active stirring blades 31 are used, and two layers of horizontal plates 332 are provided on each blade. The adjacent horizontal plates 332 are staggered. The structure of multiple horizontal plates can obtain more effective stirring times under the same rotation speed and sinking and lifting speed; the rest of the structure is the same as in embodiment two, and will not be described again here.

[0070] 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.

[0071] 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.

[0072] 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. An in-situ solidification mixing device, characterized in that, The system includes a mounting support 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 mounted on the mounting support plate (1), and 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 and a stirring rotating part. The stirring fixing part is fixedly mounted at the lower end of the extension arm (2), and the stirring rotating part is rotatably connected to the stirring fixing part. Several fixed stirring blades (32) are arranged at intervals along the circumference on the outer peripheral wall of the stirring fixing part, and several fixed stirring blades (32) are arranged at intervals along the circumference on the outer peripheral wall of the stirring rotating part. An active stirring blade (31) is provided, and a fixed stirring blade (32) is staggered with the active stirring blade (31) to achieve mutual cutting; a nozzle (53) is provided on the inner side of at least one of the fixed stirring blades (32) on each stirring head (3); the oil circuit system (4) and the conveying pipeline system (5) are respectively provided on the extension arm (2); the oil circuit system (4) is connected to the stirring rotating part; the oil circuit system (4) is used to drive the stirring rotating part to rotate, and at the same time, the number of rotations is calculated and recorded by the amount of oil flowing through; the conveying pipeline system (5) is connected to the nozzle (53); the conveying pipeline system (5) is used to spray solidified materials and / or high-pressure gas from the nozzle (53); 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).

2. The in-situ solidification mixing equipment according to claim 1, characterized in that, The stirring fixing part is a fixed support (22); the fixed support (22) is fixedly installed at the lower end of the extension arm (2), and the fixed stirring blades (32) are arranged circumferentially on the outer peripheral wall of the fixed support (22); the stirring rotating part includes a rotating shaft (35), a rotating shell (36) and a rotating drive (37); the rotating drive (37) is installed in the fixed support (22) and provides rotational power, the rotating shell (36) is rotatably connected to the fixed support (22) through the rotating shaft (35), and the rotating shaft (35) is fixedly connected to the driving part of the rotating drive (37); the active stirring blades (31) are arranged circumferentially on the outer peripheral wall of the rotating shell (36).

3. The in-situ solidification mixing equipment according to claim 2, characterized in that, The rotating outer shell (36) has end blades (34) arranged at intervals along the circumference at its ends; the bottom surface of the rotating outer shell (36) is provided with a cover plate (38); a number of ribs (39) are arranged along the diameter of the cover plate (38); the ribs (39) protrude 3 to 5 cm from the cover plate (38).

4. The in-situ solidification mixing equipment according to claim 2, characterized in that, Both the active stirring blade (31) and the fixed stirring blade (32) include a vertical plate (331) and a horizontal plate (332), and the horizontal plate (332) has at least one layer; the vertical plate (331) of the active stirring blade (31) is fixedly mounted on the rotating outer shell (36), and the vertical plate (331) of the fixed stirring blade (32) is fixedly mounted on the fixed support (22); the active stirring blade (31) and the fixed stirring blade (32) are arranged opposite to each other, so that an overlapping cutting area (333) is formed between the horizontal plate (332) of the active stirring blade (31) and the horizontal plate (332) of the fixed stirring blade (32); and the horizontal plate (332) of the active stirring blade (31) and the horizontal plate (332) of the fixed stirring blade (32) are distributed in a staggered manner.

5. The in-situ solidification mixing equipment according to claim 4, 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).

6. The in-situ solidification mixing equipment according to claim 4, characterized in that, The angle between the horizontal plate (332) and the tangent direction of the rotating outer shell (36) is 15°~30°.

7. The in-situ solidification 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 stirring and rotating part of each stirring head (3) through a first drive oil pipe (461). The stirring and rotating part 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 in-situ solidification mixing equipment according to claim 1, characterized in that, 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) is used to provide curing agent and auxiliary high-pressure gas for curing and mixing. A connecting plate (12) is provided on the mounting support plate (1), and a pin hole (13) is provided on the connecting plate (12). The mounting support plate (1) and the construction carrier (7) are fixedly connected by a pin shaft (11) passing through the pin hole (13). The extension arm (2) is a hollow structure, and a reinforcing rib plate (21) is provided at the connection between the extension arm (2) and the mounting support plate (1).

9. A construction method for an in-situ solidification mixing device, characterized in that, The application of the in-situ solidification mixing equipment according to claim 8 includes the following steps: (a) Before construction, the area to be cured is laid out and the construction area is divided. If there are areas with large cross-sectional changes, the treatment blocks can be adjusted accordingly to facilitate construction. (b) Fix the in-situ curing and mixing equipment to the front end of the excavator or other construction carrier (7) through the connecting plate (12), pin (11) and pin hole (13); 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 (7); at the same time, connect the conveying pipeline system (5) 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; (c) After the construction equipment is in place, the material supply back-end (6) starts to transport the curing agent slurry through the material supply pipe (61) or uses high pressure gas to transport the curing agent powder through pneumatic conveying. At the same time, the material supply back-end (6) starts to provide high pressure gas for curing and mixing through the gas supply pipe (62). When the curing agent material and high pressure gas are transported to the mixing head (3), the soil mixing construction begins. (d) During the on-site mixing construction, depending on the moisture content of the original soil and the form of the 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 active mixing blades (31) on the mixing head (3) rotate in the forward direction, while the fixed mixing blades (32) on the mixing head (3) remain stationary. The two sets of blades can achieve the effect of staggered mixing during the mixing operation. During construction, the mixing is gradually deepened and the curing agent material and high-pressure gas are continuously sprayed until the curing design depth is reached. In order 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 kept at the bottom for at least 10 seconds before the reverse rotation spraying and lifting operation is carried out until the mixing head (3) is completely lifted out of the ground to complete the mixing operation. (e) Move to the next work position and repeat the construction steps (d) for the next work. 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 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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