A two-way mixing device for in-situ soil solidification and a method for foundation solidification in tidal flat areas

Abstract

The present invention discloses a two-way mixing device for in-situ soil solidification and a method for solidifying foundations in tidal flats. The mixing device includes a stirring arm and at least two stirring drums. All the stirring drums are rotatably arranged at the front end of the stirring arm and are evenly arranged around the circumference of the stirring arm. Each stirring drum includes a driving device and at least two stirring drum units. Two adjacent stirring drum units are rotationally connected via a stirring drum connecting device. The driving device drives all the stirring drum units to rotate simultaneously, and the rotation directions of two adjacent stirring drum units are opposite. The present invention can solve the problem of uneven mixing caused by the clumping of soil particles during the mixing process in tidal flats by using stirring drum units with opposite rotation directions. The multifunctional pipeline conveying mechanism formed by multiple nozzles can solve the problem that current stirring equipment cannot be applied to multiple working conditions at the same time.

Description

Technical Field

[0001] This invention belongs to the field of civil engineering equipment, and specifically relates to a two-way mixing device for in-situ soil solidification and a method for foundation solidification in tidal flat areas. Background Technology

[0002] Soft soil subgrades are generally characterized by fine particles, high clay and organic matter content, and low permeability, making it difficult to meet engineering requirements in terms of strength and compressibility. In-situ solidification technology, based on the solidification method, has seen increasing application in shallow soft soil foundation treatment in recent years. In-situ solidification technology involves mixing and stirring the solidification material with the soft soil in situ to form a stronger mixed soil mass. This maximizes the utilization of the original soil and offers advantages such as minimal environmental impact, flexible construction techniques, and low cost.

[0003] However, in coastal tidal flat areas, soil particles often clump together when using traditional mixing equipment for in-situ solidification, resulting in uneven soil mixing and affecting the effectiveness of in-situ solidification. At the same time, traditional mixing equipment cannot handle various working conditions, requiring the selection of different mixing equipment based on the specific conditions, which increases construction costs.

[0004] Therefore, it is urgent to solve the problem of uneven mixing caused by soil particle agglomeration during soil mixing in coastal tidal flat areas, and the problem that current mixing equipment cannot be used for multiple working conditions at the same time. Summary of the Invention

[0005] The purpose of this invention is to provide a method for solidifying the foundation of tidal flats using a two-way mixing device for in-situ soil solidification. By designing a single mixing drum as a unit connected by mixing drums rotating in different directions, the mixing device with this structure can solidify the foundation of tidal flats and solve the problem of uneven mixing caused by soil particle agglomeration during soil mixing in coastal tidal flats. The multi-functional pipeline conveying mechanism formed by multiple nozzles can solve the problem that current mixing devices cannot be used for multiple working conditions at the same time.

[0006] A two-way mixing device for in-situ soil solidification includes a mixing arm and at least two mixing drums; all mixing drums are rotatably mounted at the front end of the mixing arm and are evenly arranged around the circumference of the mixing arm.

[0007] Each stirring drum includes a drive unit and at least two stirring drum units; adjacent stirring drum units are rotatably connected by a stirring drum connecting device; the drive unit drives all stirring drum units to rotate simultaneously, and the rotation directions of adjacent stirring drum units are opposite.

[0008] Furthermore, there are two stirring drums, referred to as the left stirring drum and the right stirring drum, which have the same structure;

[0009] Taking the left stirring drum as an example, its structure includes two stirring drum units, referred to as the upper stirring drum unit and the lower stirring drum unit. One end of the upper stirring drum unit is rotatably connected to the stirring arm, and the other end of the upper stirring drum unit is rotatably connected to one end of the stirring drum connecting device. The other end of the stirring drum connecting device is rotatably connected to one end of the lower stirring drum unit. The driving device drives the upper stirring drum unit and the lower stirring drum unit to rotate simultaneously, and the rotation direction of the upper stirring drum unit is opposite to that of the lower stirring drum unit.

[0010] Furthermore, both the upper and lower stirring drum units have a waterproof outer shell with a cylindrical structure, and the inner circumferential sidewalls of the outer shell are machined with teeth along the circumferential direction to form a toothed ring;

[0011] The driving device includes a hydraulic motor, an upper stirring drum unit transmission gear that meshes with the inner wall of the upper stirring drum unit housing, and a lower stirring drum unit transmission gear that meshes with the inner wall of the lower stirring drum unit housing. The hydraulic motor is installed in the stirring arm. The lower stirring drum unit transmission gear includes a primary transmission gear and a secondary transmission gear. The primary transmission gear is coaxially arranged with the lower stirring drum unit housing. The secondary transmission gear meshes with the inner wall of the lower stirring drum unit housing and with the outer wall of the primary transmission gear. The upper stirring drum unit transmission gear is connected to the hydraulic motor through a transmission rod one, and the primary transmission gear is connected to the transmission rod one through a transmission rod two.

[0012] The upper and lower mixing drum units achieve bidirectional mixing through the drive of a hydraulic motor and the transmission of multi-stage gears, which can reduce the phenomenon of soil particles clumping during construction in coastal tidal flat areas and make the mixing more uniform.

[0013] Specifically, the transmission rod one has a through hole in the center along the axial direction, and a connecting groove is opened on the inner side wall of the transmission rod one in a direction parallel to the axis. The outer circumferential side wall of the transmission rod two has a protrusion that matches the connecting groove of the transmission rod one in a direction parallel to the axis. The transmission rod two is fixedly connected to the transmission rod one by being engaged in the connecting groove inside the transmission rod one through the protrusion.

[0014] More specifically, the connection structure between the hydraulic motor and transmission rod one and transmission rod two is as follows: transmission rod one has a through hole in the center along the axial direction; the inner side wall of transmission rod one has a connecting groove for installing transmission rod two in a direction parallel to the axis; the outer circumferential side wall of transmission rod one has a protrusion for connecting the transmission gear of the upper stirring drum unit in a direction parallel to the axis; the center of the transmission gear of the upper stirring drum unit has a through hole in the center along the axial direction, and a connecting groove is formed in the through hole along the axial direction; the protrusion on the outside of transmission rod one is adapted to the connecting groove of the transmission gear of the upper stirring drum unit; the outer circumferential side wall of transmission rod two has a protrusion adapted to the connecting groove of transmission rod one in a direction parallel to the axis; the outer diameter of transmission rod two is the same as the inner diameter of transmission rod one; transmission rod two is slidably engaged in the through hole of transmission rod one through the protrusion. Transmission rod one is fixed to the output shaft of the hydraulic motor via a coupling. When the hydraulic motor rotates, transmission rod one drives transmission rod two to rotate, thereby driving the transmission gear of the upper stirring drum unit and the outer shell of the upper stirring drum unit to rotate in the same direction. At the same time, transmission rod two drives the first-stage transmission gear to rotate in the same direction, and then drives the outer shell of the lower stirring drum unit to rotate in the opposite direction through the second-stage transmission gear.

[0015] Furthermore, the mixing drum connecting device includes a waterproof cylindrical outer shell. A second transmission rod passes through the outer shell and connects to a first transmission rod. Both ends of the outer shell are rotatably connected to the outer shells of the upper and lower mixing drum units, respectively, with a dynamic seal at the connection points. The upper and lower mixing drum units are connected via the mixing drum connecting device, facilitating disassembly, maintenance, and upkeep.

[0016] Furthermore, multiple blades are provided on the outer shell of the upper and lower mixing drum units. All blades on the outer shell of the upper mixing drum unit are spirally arranged around the outer shell of the upper mixing drum unit along the axial direction, and all blades on the outer shell of the lower mixing drum unit are spirally arranged around the outer shell of the lower mixing drum unit along the axial direction. All blades are inclined, and the spiral direction and the inclination direction of the blades of the upper and lower mixing drum units are opposite.

[0017] When the blades of the upper mixing drum unit rotate, they tend to press down on the soil being mixed, while when the blades of the lower mixing drum unit rotate, they tend to flip up on the soil being mixed, making the mixing more thorough. The angle and size of the blades can be selected according to the geological conditions and construction area of ​​the construction site.

[0018] Furthermore, a fixed pipe is connected to the outside of the stirring arm. The fixed pipe is equipped with a liquid curing agent spray pipe, a high-pressure gas spray pipe, and a powder spray pipe. Each spray pipe extends out of the fixed pipe and is provided with an umbrella-shaped nozzle at the outlet of each spray pipe.

[0019] The liquid curing agent spray nozzle can be made of rubber, which combines good flexibility and water resistance. The inner wall of the nozzle is coated with polyethylene material to prevent corrosive substances in the curing agent from damaging the nozzle and to extend its service life. The diameter and thickness of the liquid curing agent spray nozzle can be selected according to the flow rate and pressure of the liquid.

[0020] The high-pressure gas nozzle can be made of EPDM compound rubber, which has a rubber-like appearance, softness, and elasticity, and good resistance to corrosion, oxidation, and aging. Polytetrafluoroethylene (PTFE) gaskets are used at the sealing points to improve its wear resistance and corrosion resistance. The diameter and thickness of the high-pressure gas nozzle can be selected according to the air pressure.

[0021] The powder spray nozzle can be made of rubber, which combines good flexibility and water resistance. The inner wall of the nozzle is coated with a smooth polyurethane coating to reduce friction and prevent powder from sticking to the pipe wall and causing blockage. The diameter and thickness of the powder spray nozzle can be selected according to the output volume and output rate of the powder.

[0022] The umbrella-shaped nozzle is made of high-speed steel SKH2 with a polyethylene coating to prevent corrosion from soil-borne substances and extend its service life. The umbrella-shaped nozzle connects to the spray pipe and can be disassembled at any time depending on the working conditions. The size of the umbrella-shaped nozzle can be customized according to the on-site construction requirements.

[0023] Preferably, for more uniform mixing, each type of nozzle has two outlets, one with its outlet facing the left mixing drum and the other with its outlet facing the right mixing drum; the powder nozzle is located at the very front of the fixed tube.

[0024] The present invention has the following beneficial effects:

[0025] This invention designs a single mixing drum as a combination of multiple mixing drum units connected together. Through hydraulic motor drive and multi-stage gear transmission, the multiple mixing drum units can achieve bidirectional mixing, which can reduce soil particle clumping during construction in coastal tidal flat areas and make the mixing more uniform.

[0026] This invention features multiple nozzles, making it suitable for various working conditions, achieving multi-purpose functionality, reducing construction costs, and minimizing the instrument's footprint. The liquid curing agent nozzle is used for wet construction, the powder nozzle for dry construction, and the high-pressure gas nozzle assists in blowing the curing agent into the soil, ensuring uniform mixing. Additionally, the high-pressure gas nozzle cleans clay adhering to the blades.

[0027] The present invention provides blades in the mixing drum unit. The blades rotate with the mixing drum unit to mix the soil, which conforms to the mixing movement trend of the soil and can make the soil mix more evenly.

[0028] The stirring drum unit of the present invention is connected by a stirring drum connecting device, which facilitates disassembly, maintenance and care. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall structure of a preferred embodiment of the present invention;

[0030] Figure 2 A schematic diagram of a structure connecting multiple nozzles to a fixed pipe;

[0031] Figure 3 This is a schematic diagram of the left stirring drum.

[0032] Figure 4 This is a schematic diagram of the overall structure of the upper stirring drum;

[0033] Figure 5 This is a schematic diagram of the internal structure of the upper stirring drum;

[0034] Figure 6 This is a schematic diagram of the overall structure of the lower stirring drum;

[0035] Figure 7 This is a schematic diagram of the internal structure of the lower stirring drum;

[0036] Figure 8 A schematic diagram of the overall structure of the stirring drum connection device;

[0037] Figure 9 This is a schematic diagram of the connection structure between transmission rod one and transmission rod two.

[0038] The attached diagram lists the components represented by each number as follows:

[0039] 1-Agitator arm; 2-Multi-functional pipeline delivery mechanism; 3-Left agitator drum; 4-Fixed pipe; 5-Liquid curing agent spray nozzle; 6-High-pressure gas spray nozzle; 7-Powder spray nozzle; 8-Umbrella-shaped nozzle; 9-Upper agitator drum unit; 10-Lower agitator drum unit; 11-Agitator drum connecting device; 12-Lower pressing blade; 13-Upper agitator drum unit housing; 14-Upper agitator drum unit transmission gear; 15-Transmission rod one; 16-Upward flipping blade; 17-Lower agitator drum unit housing; 18-Secondary transmission gear; 19-Primary transmission gear; 20-Transmission rod two; 22-Agitator drum connecting device housing; 24-Dynamic seal. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be further described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example 1:

[0041] This embodiment provides a two-way mixing device for in-situ soil solidification, such as... Figure 1 As shown, the system includes a mixing arm 1, a multi-functional pipeline conveying mechanism 2, and two mixing drums. The two mixing drums are designated as the left mixing drum and the right mixing drum. The mixing arm 1 is detachably mounted on the excavating equipment and is made of high-quality carbon steel that has undergone machining and heat treatment, with a galvanized surface for rust prevention. The model and size of the mixing arm can be selected according to the model and size of the excavator on site. The multi-functional pipeline conveying mechanism 2 and the left and right mixing drums are mounted on the mixing arm 1.

[0042] In other embodiments, it may include 3 or 4 stirring drums, all of which are rotatably mounted at the front end of the stirring arm and are evenly arranged around the circumference of the stirring arm.

[0043] like Figure 2 As shown, the multi-functional pipeline delivery mechanism 2 includes a fixed pipe 4, a liquid curing agent spray pipe 5, a high-pressure gas spray pipe 6, a powder spray pipe 7, and an umbrella-shaped nozzle 8. The fixed pipe 4 is made of Q355 steel, with a galvanized surface for rust prevention and a phosphate coating to improve its wear and corrosion resistance. The fixed pipe 4 has a width of 7D and can fix six delivery pipes with a diameter of D, thus improving the stability and controllability of the mixing process. The liquid curing agent spray pipe 5 has a diameter of D and is made of rubber, possessing good flexibility and waterproof properties. The inner wall of the pipe is coated with polyethylene material to prevent corrosive substances in the curing agent from corroding the pipe, extending its service life. The high-pressure gas spray pipe 6 has a diameter of D and is made of EPDM compound rubber, with an appearance, softness, and elasticity similar to rubber. It has good corrosion resistance, oxidation resistance, and aging resistance. A polytetrafluoroethylene gasket is used at the sealing point to improve its wear resistance and corrosion resistance. The powder spray nozzle 7 has a diameter of D and is made of rubber, offering good flexibility and water resistance. The inner wall of the nozzle is coated with a smooth polyurethane layer to reduce friction and prevent powder from adhering to the pipe wall and causing blockage. The liquid curing agent spray nozzle 5, the high-pressure gas spray nozzle 6, and the powder spray nozzle 7 are all connected to umbrella-shaped nozzles 8 at their ends, enabling more even injection of the sprayed material into the soil. The umbrella-shaped nozzles 8 are made of high-speed steel SKH2 with a polyethylene coating to prevent corrosion from soil-borne substances and extend their service life. The umbrella-shaped nozzles are connected to the spray nozzles and can be disassembled at any time depending on the working conditions.

[0044] The left and right stirring drums have the same structure. Taking the left stirring drum 3 as an example, as follows: Figure 3 , 4 As shown in Figure 5, the device includes an upper stirring drum unit 9, a lower stirring drum unit 10, a stirring drum connecting device 11, and a driving device, wherein the upper stirring drum unit 9 and the lower stirring drum unit 10 are connected together by the stirring drum connecting device 11.

[0045] In other embodiments, each stirring drum may include 3 or 4 stirring drum units, with adjacent stirring drum units being rotatably connected by a stirring drum connecting device, provided that the rotation directions of the adjacent stirring drum units are opposite.

[0046] like Figure 4 , 5 The upper mixing drum unit 9 includes multiple downward pressing blades 12, an upper mixing drum unit housing 13, an upper mixing drum unit transmission gear 14, and a transmission rod 15. All the downward pressing blades on the upper mixing drum unit housing are spirally arranged axially around the housing. The blades are constructed from spliced ​​chromium carbide wear-resistant steel plates and include a connecting plate vertically positioned relative to the housing and a blade inclined relative to the housing. The angle between the blade and the connecting plate is between 45° and 60°. Both the connecting plate and the blade are coated with polyethylene material to prevent corrosion. When the downward pressing blades rotate, they exert a downward pressure on the soil being mixed. The angle and size of the blades can be selected according to the geological conditions and construction area of ​​the site. The upper mixing drum unit housing 13 is a waterproof, cylindrical shell structure made of high-speed steel SKH2 with a polyethylene coating, providing good waterproofing and corrosion resistance.

[0047] like Figure 5 The inner circumference of the upper stirring drum unit housing is machined with teeth, making the upper stirring drum unit housing an internal gear. The internal teeth of the upper stirring drum unit housing mesh with the upper stirring drum unit transmission gear 14. The upper stirring drum unit housing and the upper stirring drum unit transmission gear 14 are made of stainless steel. The outer teeth of the upper stirring drum unit transmission gear mesh with the inner teeth of the upper stirring drum unit housing 13. A through hole is opened axially at the center of the upper stirring drum unit transmission gear. A connecting groove is opened in the through hole in a direction parallel to the axis. A protrusion matching the connecting groove of the upper stirring drum unit transmission gear is opened on the outer side wall of the transmission rod 15. The protrusion slides and engages in the connecting groove, connecting the upper stirring drum unit transmission gear 14 and the transmission rod 15 together. The transmission rod 15 is made of bearing steel GCr15. The center of the transmission rod 15 has an axial through hole, making the transmission rod 15 a hollow sleeve structure with an inner side wall. The inner side wall of the transmission rod 15 has a connecting groove in a direction parallel to the axis. The hydraulic motor is housed within the stirring arm. The output shaft of the hydraulic motor is connected to the first transmission rod via a coupling. One end of the coupling connects to the first transmission rod, and the other end connects to the output shaft of the hydraulic motor. One end of the coupling has an internal connecting groove that mates with an external protrusion on the first transmission rod. The hydraulic motor, its output shaft, and the coupling are not shown in the figure. When the hydraulic motor rotates, the first transmission rod 15 drives the transmission gear 14 of the upper stirring drum unit to rotate, which in turn drives the outer casing 13 of the upper stirring drum unit to rotate in the same direction.

[0048] like Figure 6 , 7 As shown, the lower mixing drum unit 10 includes multiple upward-turning blades 16, a lower mixing drum unit housing 17, a secondary transmission gear 18, a primary transmission gear 19, and a transmission rod 20. All the upward-turning blades 16 on the lower mixing drum unit housing are spirally arranged axially around the housing. Each upward-turning blade 16 is constructed from chromium carbide wear-resistant steel plates and includes a connecting plate vertically positioned relative to the housing and a blade inclined relative to the housing. The angle between the blade and the connecting plate is between 45° and 60°. The surfaces of the connecting plate and the blade are coated with polyethylene material to prevent corrosion. When the upward-turning blades rotate, they tend to turn upwards on the soil being mixed. The angle and size of the blades can be selected according to the geological conditions and construction area of ​​the site. The lower mixing drum unit housing 17 is a waterproof, cylindrical shell structure made of high-speed steel SKH2 with a polyethylene coating, providing good waterproofing and corrosion resistance.

[0049] like Figure 7 The inner circumference of the lower stirring drum unit housing is machined with teeth, making the lower stirring drum unit housing an internal gear. The lower stirring drum unit housing is made of stainless steel and meshes with four secondary transmission gears 18. The secondary transmission gears 18 are made of stainless steel, and the four secondary transmission gears mesh internally with the internal teeth of the lower stirring drum unit housing 17, and externally with the primary transmission gear 19. The primary transmission gear 19 is made of stainless steel, and its external teeth mesh with the secondary transmission gears 18. A through hole is opened at the center of the primary transmission gear 19 along its axial direction. A connecting groove is opened on the inner side wall of the through hole in a direction parallel to the axis. A protrusion matching the connecting groove of the primary transmission gear 19 is opened on the outer side wall of the transmission rod 20 in a direction parallel to the axis. The protrusion slides and engages in the connecting groove, connecting the primary transmission gear 19 and the transmission rod 20.

[0050] like Figure 9 As shown, the inner wall of transmission rod 15 has a connecting groove in a direction parallel to the axis, and the outer circumferential wall of transmission rod 20 has a protrusion in a direction parallel to the axis. The protrusion of transmission rod 20 matches the connecting groove of transmission rod 15. The outer diameter of transmission rod 20 is the same as the inner diameter of transmission rod 1. Transmission rod 20 is secured in transmission rod 1 by the protrusion and is fixedly connected to transmission rod 1 as a whole. The material of transmission rod 20 is low carbon alloy steel.

[0051] The outer wall of transmission rod 15 has a protrusion parallel to the axis, which matches the connecting groove of the transmission gear of the upper stirring drum unit. One end of transmission rod 15 is fitted into the connecting groove of the transmission gear of the upper stirring drum unit, and the other end is connected to the output shaft of the hydraulic motor via a coupling. The hydraulic motor, the output shaft of the hydraulic motor, and the coupling are all existing technologies and are not shown in the figure. One end of the coupling has a connecting groove that matches the protrusion on the outer wall of transmission rod 15. One end of transmission rod 15 is fixedly connected to the output shaft of the hydraulic motor via the coupling, and the other end is fixedly connected to the transmission gear 14 of the upper stirring drum unit. When the hydraulic motor rotates, transmission rod 15 drives the transmission gear 14 of the upper stirring drum unit to rotate, and then the transmission gear of the upper stirring drum unit drives the outer shell 13 of the upper stirring drum unit to rotate in the same direction. Transmission rod 15 simultaneously drives transmission rod 20 and the first-stage transmission gear 19 to rotate in the same direction, and then drives the outer shell 17 of the lower stirring drum unit to rotate in the opposite direction via the second-stage transmission gear 18.

[0052] like Figure 8 As shown, the mixing drum connecting device includes a cylindrical structure and a waterproof outer shell. The outer shell 22 of the mixing drum connecting device is made of high-speed steel SKH2 with a polyethylene coating on the surface, providing good waterproof and corrosion resistance. The second transmission rod passes through the outer shell of the mixing drum connecting device and connects to the first transmission rod. Both ends of the outer shell of the mixing drum connecting device are rotatably connected to the outer shells of the upper and lower mixing drums, respectively. A dynamic seal 24 is provided at the connection point, preventing the outer shell 22 of the mixing drum connecting device from rotating with the upper mixing drum unit 9 and the lower mixing drum unit 10. The upper mixing drum unit 9 and the lower mixing drum unit 10 rotate independently relative to the outer shell of the mixing drum connecting device.

[0053] The working principle and process of the two-way mixing device for in-situ soil solidification provided by this invention are as follows:

[0054] When using this equipment for mixing construction, first, the mixing equipment is installed on the excavator via the mixing arm 1. The excavator is only driven in after the ground soil has reached a compressive strength of at least 25 MPa to ensure the safety and stability of the equipment during construction. Next, different nozzles are activated according to different working conditions. The high-pressure gas nozzle 6 is connected to the high-pressure air pump. For wet construction, the liquid curing agent nozzle 5 is connected to the curing agent cylinder; for dry construction, the powder nozzle 7 is connected to the powder container. After the mixing equipment is in place, the pressure pump of the corresponding nozzle is turned on. Simultaneously, the hydraulic system of the excavator is started, driving the hydraulic motor to rotate. When the hydraulic motor rotates, the transmission rod 15 drives the transmission gear 14 of the upper mixing drum unit to rotate, and then the transmission gear of the upper mixing drum unit drives the outer shell 13 of the upper mixing drum unit to rotate in the same direction. Meanwhile, transmission rod 20 is tightly connected to transmission rod 15 and rotates in the same direction. Transmission rod 20 drives the primary transmission gear 19 to rotate, which in turn drives the lower mixing drum unit housing 17 to rotate in the opposite direction via the secondary transmission gear 18. This achieves the bidirectional mixing function of the mixing equipment, reducing soil particle clumping during construction in coastal tidal flat areas and making the mixing more uniform. The downward-pressing blade 12 and the upward-turning blade 13 rotate in opposite directions to cut the soil, conforming to the soil mixing trend and enabling more uniform soil mixing. At the same time, the high-pressure gas nozzle 6 can assist in filling the solidifying agent during soil cutting to ensure uniform soil mixing, and can also clean the mud adhering to the blades. Example 2:

[0055] A method for solidifying the foundation in tidal flat areas includes the following steps:

[0056] Step 1: Level the site and use a total station to transfer the axis.

[0057] Step 2: Divide the area to be cured into blocks according to the design plan, and use positioning rods to determine the four vertices of each block area;

[0058] Step 3: Set up access roads for the mixing machinery and prepare the initial mixing site;

[0059] Step 4: Check whether the compressive strength of the soil at the construction site meets the equipment bearing requirements, and connect the curing equipment to the mixing arm of the excavator;

[0060] Step 5: Select the appropriate spray nozzle and material cylinder connection for the curing equipment according to different working conditions;

[0061] Step 6: After the mixing equipment is in place, start the hydraulic system of the excavator to drive the curing equipment to rotate. Once the rotation speed of the mixing drum of the curing equipment stabilizes between 15 and 30 r / min, use the excavator to move the curing equipment into the soil to the designed depth, controlling the mixing and sinking speed at 0.6 to 0.8 m / min. Turn on the corresponding spray pressure pump and spray for 30 seconds. Then, lift the excavator at a uniform speed, controlling the lifting speed to within 1.0 m / min. During the lifting process, the spray nozzle will operate simultaneously. Lift the curing equipment to 0.5 m above the designed elevation, repeat the mixing and sinking to the designed depth, spray again, mix and lift to 0.5 m above the designed elevation, until the amount of curing agent injected by the spray nozzle reaches the designed requirement. Stop spraying and lift to the ground. The construction of this section is now complete.

[0062] Step 7: The excavator moves the curing equipment to the next area for construction.

[0063] Finally, it should be noted that the above embodiments of the present invention are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of protection of the claims of the present invention.

Claims

1. A two-way mixing device for in-situ soil solidification, characterized in that: It includes a stirring arm and at least two stirring drums; all stirring drums are rotatably mounted at the front end of the stirring arm and are evenly arranged around the circumference of the stirring arm. Each stirring drum includes a drive unit and at least two stirring drum units; adjacent stirring drum units are rotatably connected by a stirring drum connecting device; the drive unit drives all stirring drum units to rotate simultaneously, and the rotation directions of adjacent stirring drum units are opposite. There are two stirring drums, referred to as the left stirring drum and the right stirring drum, and they have the same structure. Taking the left stirring drum as an example, its structure includes two stirring drum units, referred to as the upper stirring drum unit and the lower stirring drum unit; one end of the upper stirring drum unit is rotatably connected to the stirring arm, the other end of the upper stirring drum unit is rotatably connected to one end of the stirring drum connecting device, the other end of the stirring drum connecting device is rotatably connected to one end of the lower stirring drum unit, and the driving device drives the upper stirring drum unit and the lower stirring drum unit to rotate simultaneously, and the rotation direction of the upper stirring drum unit is opposite to the rotation direction of the lower stirring drum unit; Both the upper and lower stirring drum units have a cylindrical waterproof outer shell, and the inner circumferential sidewalls of the outer shells are machined with teeth along the circumferential direction to form a toothed ring; The driving device includes a hydraulic motor, an upper stirring drum unit transmission gear that meshes with the inner wall of the upper stirring drum unit housing, and a lower stirring drum unit transmission gear that meshes with the inner wall of the lower stirring drum unit housing. The hydraulic motor is installed in the stirring arm. The lower stirring drum unit transmission gear includes a primary transmission gear and a secondary transmission gear. The primary transmission gear is coaxially arranged with the lower stirring drum unit housing. The secondary transmission gear meshes with the inner wall of the lower stirring drum unit housing and with the outer wall of the primary transmission gear. The upper stirring drum unit transmission gear is connected to the hydraulic motor through a transmission rod one, and the primary transmission gear is connected to the transmission rod one through a transmission rod two. Multiple blades are provided on the outer shell of the upper and lower mixing drum units. All blades on the outer shell of the upper mixing drum unit are spirally arranged around the outer shell of the upper mixing drum unit along the axial direction, and all blades on the outer shell of the lower mixing drum unit are spirally arranged around the outer shell of the lower mixing drum unit along the axial direction. All blades are inclined, and the spiral direction and the inclination direction of the blades in the upper and lower mixing drum units are opposite.

2. The soil in-situ solidification bidirectional mixing equipment according to claim 1, characterized in that, The transmission rod one has a through hole in the center along the axial direction. The inner side wall of the transmission rod one has a connecting groove in the direction parallel to the axis. The outer circumference of the transmission rod two has a protrusion that matches the connecting groove of the transmission rod one in the direction parallel to the axis. The transmission rod two is fixedly connected to the transmission rod one by being engaged in the connecting groove inside the transmission rod one through the protrusion.

3. The soil in-situ solidification bidirectional mixing equipment according to claim 2, characterized in that, The mixing drum connecting device includes a waterproof outer shell with a cylindrical structure. The second transmission rod passes through the outer shell of the mixing drum connecting device and is connected to the first transmission rod. The two ends of the outer shell of the mixing drum connecting device are respectively rotatably connected to the outer shell of the upper mixing drum unit and the outer shell of the lower mixing drum unit, and the connection is dynamically sealed.

4. A two-way mixing device for in-situ soil consolidation according to any one of claims 1-3, characterized in that, A fixed pipe is connected to the outside of the mixing arm. The fixed pipe contains a liquid curing agent spray pipe, a high-pressure gas spray pipe, and a powder spray pipe. Each spray pipe extends outward from the fixed pipe, and each spray pipe outlet is equipped with an umbrella-shaped nozzle.

5. The soil in-situ solidification bidirectional mixing equipment according to claim 4, characterized in that, Each type of nozzle has two outlets, one facing the left mixing drum and the other facing the right mixing drum; the powder nozzle is located at the very front of the fixed tube.

6. A method for solidifying the foundation in tidal flat areas, using a two-way mixing device for in-situ soil solidification as described in claim 1, characterized in that... Includes the following steps: Step 1: Level the site; Step 2: Divide the area to be cured into sections according to the design plan; Step 3: Set up access roads for the mixing machinery and prepare the initial mixing site; Step 4: Check whether the compressive strength of the soil at the construction site meets the equipment bearing requirements; Step 5: Select the appropriate spray nozzle and material cylinder connection for the curing equipment according to different working conditions; Step 6: After the mixing equipment is in place, start the hydraulic system of the excavator to drive the curing equipment to rotate. Once the rotation speed of the mixing drum of the curing equipment stabilizes between 15 and 30 r / min, use the excavator to move the curing equipment into the soil to the designed depth, controlling the mixing and sinking speed at 0.6 to 0.8 m / min. Turn on the corresponding spray pressure pump and spray for 30 seconds. Then, lift the equipment at a uniform speed, controlling the lifting speed to within 1.0 m / min. During the lifting process, the spray nozzle will operate simultaneously. Lift the curing equipment to 0.5 m above the designed elevation, repeat the mixing and sinking to the designed depth, spray again, mix and lift to 0.5 m above the designed elevation, until the amount of curing agent injected by the spray nozzle reaches the designed requirement. Stop spraying and lift to the ground. The construction of this section is now complete. Step 7: The excavator moves the curing equipment to the next area for construction.

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