River bank ecological restoration grouting device based on EICP mineralization technology

Abstract

The invention discloses a river bank ecological restoration grouting device based on an EICP mineralization technology. The river bank ecological restoration grouting device comprises a portable movable grouting device and a staged multi-round dynamic grouting method. The portable and movable grouting device is composed of a movable cart, a grouting pump, a slurry box, a grouting roller, a grouting roller main pipe, a connecting pipe, a grouting roller bearing, a grouting anchor pipe, a grouting roller main pipe grouting opening, a grouting roller bin, a grouting anchor pipe mounting hole and a metal spraying filter screen. According to the staged multi-round dynamic grouting method matched with the method, on the basis that the plant adaptability is guaranteed, a river bank slope soil body is effectively reinforced, and the water and soil loss risk is remarkably reduced. The EICP mineralization technology is combined with the plant root system, a synergistic remediation mode of EICP mineralization reinforcement-plant root system soil fixation is constructed, and the method has the double advantages of structural stability and ecological sustainability and is particularly suitable for the field of river bank slope ecological environment remediation.

Description

Technical Field

[0001] The present invention belongs to the technical field of river bank slope ecological restoration and reinforcement, and in particular relates to a river bank ecological restoration grouting device based on EICP mineralization technology. Background Art

[0002] my country has placed higher demands on the protection and restoration of riverbank ecosystems. The promulgation and implementation of the Yangtze River Protection Law clearly establishes the holistic protection of the Yangtze River basin ecosystem as a core task. As a key transition zone between aquatic and terrestrial ecosystems, the ecological stability of the riparian zone is crucial for maintaining the basin's ecological balance and ensuring flood control safety. Furthermore, the "Technical Guidelines for River Ecological Restoration" provide specific regulations on technical standards, implementation procedures, and effectiveness evaluation for riverbank restoration, further highlighting the urgency of scientifically optimizing riverbank protection technologies.

[0003] Urease-induced calcium carbonate precipitation (EICP) technology is a green, low-carbon and environmentally friendly bionic repair technology that uses plant urease to catalyze the hydrolysis of urea (CO(NH2)2) to produce NH4 + and CO3 2- , CO3 2- Combined with exogenous calcium, it forms CaCO3 precipitates. The mineralized coating produced by EICP technology is highly compatible with plants, and the external calcium source in the EICP binder promotes plant growth. EICP mineralization combined with plants can restore the ecological environment of bank slopes, not only consolidating soil and conserving water, but also improving ecosystems across time and space.

[0004] EICP mineralization technology has broad application prospects in the field of ecosystem restoration projects. The Chinese invention patent "An integrated method for rapid solidification of mobile sand dunes and planting of economic plants" (Patent No.: ZL202411629072.2) discloses a technical solution that combines rapid solidification of mobile sand dunes with planting of economic plants to address soil desertification. Currently, the application of existing EICP technology in ecological restoration projects mainly focuses on combined plant windbreak and sand fixation, while technical research on the combined reinforcement of riverbank vegetation to prevent and control soil erosion is relatively scarce. In addition, regarding the grouting devices used to combine EICP slurry and plants to reinforce soil, the existing technology mainly relies on laying grouting pipes or drone spraying. Among them, the laying of grouting pipes is more effective for reinforcing small areas of soil, but its application to large-scale river banks has problems such as high construction difficulty and high cost. The drone spraying method, although convenient to operate, can only achieve surface soil reinforcement and has limitations on the required reinforcement depth of river banks. Therefore, developing a grouting device that can achieve deep reinforcement and is easy to operate has become an urgent problem to be solved. Summary of the Invention

[0005] In view of the lack of research in the field of combining existing EICP technology with vegetation to restore riverbank ecosystems, and the problems of great construction difficulty and high cost when existing grouting devices are applied to river banks, the present invention proposes a riverbank ecological restoration grouting device based on EICP mineralization technology.

[0006] The technical solutions of the present invention are as follows:

[0007] A riverbank ecological restoration grouting device based on EICP mineralization technology includes: a mobile cart, a slurry box, a grouting pump, a connecting pipe, a grouting roller, a grouting roller main pipe, a grouting roller bin, a spiral blade, a grouting anchor pipe, and a petal opening and closing mouth. The mobile cart serves as a load-bearing and mobile base, carrying a slurry box and a grouting pump; the slurry box can be filled with urease solution, cementing liquid, urease-cementing liquid mixed solution, and can also be filled with clean water for cleaning pipes. The grouting pump is connected to the slurry box via a connecting pipe. By replacing the solution in the slurry box, the grouting mode or the pipeline cleaning mode can be easily switched. The grouting pressure can be controlled by pulse pressurization or continuous pressurization.

[0008] The grouting roller consists of a main grouting roller, a grouting roller chamber, spiral blades, a grouting anchor pipe, and a petal opening and closing port. The slurry delivery and spraying process is as follows: Under pressure, the slurry first enters the main grouting roller, then flows into the grouting roller chamber. As the grouting roller rolls, the spiral blades on the side walls of the chamber increase the centrifugal force of the slurry and act as a guide, allowing the slurry to be more smoothly introduced into the grouting anchor pipe.

[0009] The slurry is urease solution, cementing solution, mixed solution or water;

[0010] The spiral blades are welded to the side walls of the grouting roller bin and arranged at a certain inclination angle. The thickness of the blades gradually decreases from the side close to the barrel wall to the side of the central axis. The spacing between the spiral blades is 1.5 to 2.5 times the blade radius, and the spiral angle is 15° to 30°. This design has significant advantages in grouting reinforcement on slopes with a certain slope. When the grouting device is working on a slope, the slurry is easily gathered on the low side of the roller bin due to the influence of gravity. If it is not guided, it will cause uneven distribution of the slurry, thereby affecting the reinforcement effect. The spiral blades can effectively lift the slurry, and lift the slurry gathered on the low side of the roller bin to the high side of the roller bin, thereby achieving a uniform reinforcement effect. The lifting force of the spiral blades can be calculated according to formula (1):

[0011]

[0012] Where: k is the structural coefficient, ρ is the density, R0 is the radius of the spiral blade, ω is the angular velocity, ν is the rotation speed of the grouting roller, and s is the spacing between the spiral blades.

[0013] Driven by pressure, the backflow valve at the grouting anchor pipe mouth opens, and the slurry enters the grouting anchor pipe. Under the action of continuous pressure, the petal opening and closing mouth at the front end of the grouting anchor pipe automatically opens, and the slurry is finally sprayed out through the stainless steel spray filter.

[0014] The stainless steel spray filter is located at the connection between the conical cone and the petal mouth of the grouting anchor pipe. It is made of 304, 316L stainless steel and pure titanium wire. The filter mesh has an aperture of 0.06 to 0.15 mm, a mesh size of 150 to 300 meshes, and an opening rate of ≥50%. Grouting anchor pipes at different positions on the grouting roller can achieve differentiated reinforcement: grouting anchor pipes inserted into the soil can reinforce shallow and deep soil layers, while grouting anchor pipes not inserted into the soil can complete surface spray reinforcement operations. When pulse pressurization is used, after one grouting is completed, the pressure decreases, the petals automatically retract, and the grouting anchor pipe is easy to pull out and recycle, which is conducive to forward rolling.

[0015] The grouting pump adopts a pulse grouting pump, and the grouting pressure range is 0~0.5MPa.

[0016] The grouting roller main pipe has the dual functions of roller and grouting pipe. It is made of stainless material, with a wall thickness of 0.005mm~0.01m, an outer diameter of 0.05m~0.10m, and an axis length of 0.80m~1.50m. The side wall of the grouting roller main pipe is opened with grouting holes in a plum blossom pattern along the axial direction. The spacing between the grouting holes is 2.0~5.0 times the hole diameter to ensure uniform diffusion of the slurry and improve the grouting efficiency.

[0017] The grouting roller bin is made of stainless steel pipe with a wall thickness of 0.01m to 0.02m, a diameter of 0.20m to 0.50m, and an axis length of 0.60m to 1.30m; the side wall of the grouting roller bin adopts a plum blossom-shaped arrangement of grouting anchor pipe mounting holes, the aperture of the grouting anchor pipe mounting hole is 0.01m to 0.02m, and the grouting anchor pipe is installed at the grouting anchor pipe mounting hole.

[0018] The grouting roller bearing utilizes a cartridge-type mechanical seal to achieve dynamic sealing between the grouting roller main pipe and the grouting roller chamber. Its structure consists of a stationary ring, a rotating ring, an elastic element, a spring seat, a push ring, a set screw, a rotating ring auxiliary seal, and a stationary ring auxiliary seal. The stationary ring is fixed to the inner wall of the grouting roller chamber, while the rotating ring is circumferentially fixed to the grouting roller main pipe via a set screw. The elastic element provides axial preload to seal the end faces of the dynamic and static rings. The rotating ring auxiliary seal and the stationary ring auxiliary seal are each made of fluororubber or perfluoroelastomer with a hardness of 70-90 Shore A to accommodate the weakly alkaline environment of the EICP mineralization slurry. The mechanical seal has an end-face pressure ratio of 0.2-0.5 MPa and an average linear speed of ≤10 m / s, capable of withstanding grouting pressure fluctuations of 0.5-2.0 MPa.

[0019] The reverse flow valve is installed at the connection between the grouting anchor pipe and the grouting anchor pipe mounting hole. During grouting, the slurry pushes the reverse flow valve open under the action of pressure and smoothly enters the grouting anchor pipe; when the pressure decreases, the reverse flow valve responds quickly, effectively preventing the slurry from flowing back.

[0020] The front end of the grouting anchor pipe is connected to the petal opening and closing mouth by a spring; when pressurized, the petal opening and closing mouth opens, and the slurry is sprayed out through the metal spray filter; when pressure is released, the petal opening and closing mouth closes, making it convenient for the grouting roller to move along the slope.

[0021] The present invention is based on the above-mentioned riverbank ecological restoration grouting device based on EICP mineralization technology, and provides a method for restoring riverbank ecosystems using EICP mineralization technology, comprising the following steps:

[0022] Step 1: sowing plant seeds suitable for growing on riverbank slopes, such as tall fescue and ryegrass;

[0023] Step 2: Prepare EICP solution: urease solution is extracted from soybeans, sword beans or watermelon seeds; the binder solution is prepared by mixing urea and an external calcium source in a ratio of 1:1, and the external calcium source is calcium chloride, calcium acetate, etc.

[0024] Step 3: Open the valve switch of the grouting pipe connected to the slurry box, start the grouting pump, and adjust it to the target pressure to ensure stable slurry delivery. If the single-phase grouting method is used, that is, injection after mixing: pre-mix the urease solution and the cementing liquid according to the preset volume ratio, and spray and inject them into the river bank slope at one time through the grouting pump; if the two-phase grouting method is used, that is, injection in steps: first inject the urease solution alone, and then inject the cementing liquid after an interval of 2 hours to trigger the EICP mineralization reaction, thereby achieving soil reinforcement. The interval time can also be adjusted according to the actual working conditions of the slope;

[0025] Step 4: The entire reinforcement process adopts multi-round grouting in stages. After sowing the seeds, the two-phase grouting method is used with a low concentration of cementing fluid. The Ca in the low concentration cementing fluid is 2+ and urea are beneficial to promoting plant germination; single-phase grouting method and high-concentration cementing fluid are used in the seedling and lawn stages, which not only improves soil strength but also helps reduce the stress of calcium ions and urea in high-concentration cementing fluid on plants;

[0026] Step 5: After the grouting operation is complete, close the slurry tank outlet valve to cut off the slurry supply. Fill the slurry tank with clean water and reopen the outlet valve to allow clean water to flow through key components such as the slurry tank, connecting pipes, roller main pipe, grouting roller chamber, and grouting anchor pipe to flush the system. Continue flushing with clean water until clear water is discharged from the outlet pipe. After confirming that the pipe is clean, remove the entire grouting device from the slope work surface, completing the slope reinforcement project.

[0027] The reinforcement process adopts a multi-round dynamic grouting method in stages. After sowing and before germination, a two-phase grouting method is used and the concentration of the cementing fluid is less than 150mmol / L. The Ca in the cementing fluid is 2+ and urea are beneficial to promote plant germination; in the seedling stage and the lawn stage, the single-phase grouting method is used, and the cementing fluid concentration is 150mmol / L~500mmol / L, which improves the soil strength while reducing the Ca content in the cementing fluid. 2+ and urea stress on plants.

[0028] Beneficial effects of the present invention:

[0029] (I) High efficiency and low cost: The grouting device is lightweight and portable, can be used for mobile construction, and can realize the integrated operation of surface spraying and shallow depth grouting, which can greatly improve the operation efficiency and reduce the cost;

[0030] (II) Strong adaptability to plant growth: The EICP slurry adopts a combination of dual-phase and single-phase grouting, which solves the problem of local stress of plants caused by high-concentration substances during the germination and seedling stages, and realizes the synergistic adaptation of EICP mineralization technology and plant growth.

[0031] (III) Multi-round dynamic repair: The use of multi-round grouting dynamic repair technology can not only effectively improve the adaptability of plants, but also be conducive to the long-term repair of the slope and solve the risk of local soil loosening caused by water erosion. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 Schematic diagram of the grouting device structure.

[0033] Figure 2 Schematic diagram of the grouting roller.

[0034] Figure 3 This is a schematic cross-sectional view of the grouting roller I-I.

[0035] Figure 4 This is a schematic diagram of the cross section of the grouting roller II-II.

[0036] Figure 5 This is a schematic diagram of the connection between the grouting roller main pipe and the grouting roller chamber.

[0037] Figure 6 Schematic diagram of grouting anchor pipe.

[0038] Figure 7 This is a schematic diagram of the cross section of the grouting anchor pipe III-III.

[0039] Figure 8 Schematic diagram of the backflow valve structure.

[0040] In the figure: 1-mobile cart, 2-grouting pump, 3-slurry box, 4-grouting roller, 5-grouting roller main pipe, 6-connecting pipe, 7-grouting roller bearing, 8-grouting anchor pipe, 9-grouting port of grouting roller main pipe, 10-grouting roller bin, 11-spiral blade, 12-grouting anchor pipe mounting hole, 13-petal opening and closing port, 14-backflow valve, 15-metal spray filter. DETAILED DESCRIPTION

[0041] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings and technical solutions:

[0042] Example 1:

[0043] A method for using a riverbank ecological restoration grouting device based on EICP mineralization technology mainly includes the following steps:

[0044] Step 1: Sow tall fescue seeds suitable for growing in the area on the riverbank slopes to be repaired.

[0045] Step 2: Preparation of urease solution: Grind soybeans into powder, add appropriate amount of water and stir thoroughly, let it stand for 24 hours, and take the supernatant as the urease solution; Preparation of cementing liquid: Mix urea and calcium chloride in a 1:1 ratio to form a cementing liquid.

[0046] Step 3: After moving the grouting device to the riverbank slope to be repaired, urease solution is first added to the slurry tank, and the grouting pump pressure is then adjusted to a pulse pressure of 0.2 MPa. During the pressurization operation, the grouting pump pressurizes the urease solution from the slurry tank into the grouting roller main pipe, where it is then introduced into the grouting roller chamber through the grouting port on the main pipe. As the grouting roller rotates, the centrifugal force and flow diversion effect of the spiral blades on the side walls of the chamber guide the slurry into the grouting anchor pipe more smoothly. The pressurized urease solution pushes open the reverse flow valve, travels along the grouting anchor pipe to the front end, and is finally ejected through the petal-shaped opening and closing port, ensuring that the urease solution is evenly injected or sprayed into the slope soil. During the decompression phase, the petal-shaped opening and closing port at the front end of the grouting anchor pipe closes, facilitating the removal of the grouting anchor pipe and enhancing the device's rolling motion on the slope.

[0047] Step 4: Two hours after grouting the urease solution, wait until the urease has fully diffused into the soil before adding the cementing fluid to the slurry tank. Continue grouting the cementing fluid using a pulse pressure of 0.2 MPa, following the same grouting method as described above for the urease solution. This EICP mineralization reaction generates calcium carbonate precipitation, improving the strength and stability of the slope soil.

[0048] Step 5: After the EICP solution grouting is completed, clean the grouting equipment with clean water in time, including the slurry box, grouting pump, grouting roller main pipe, grouting anchor pipe, etc., to prevent the residual solution from crystallizing in the equipment, affecting the service life of the equipment and the effect of next use.

[0049] Example 2:

[0050] A method for using a riverbank ecological restoration grouting device based on EICP mineralization technology mainly includes the following steps:

[0051] Step 1: The tall fescue on the riverbank slope to be repaired enters the seedling stage.

[0052] Step 2: Preparation of urease solution: Grind soybeans into powder, add water and stir to fully dissolve the urease, let it stand for 24 hours, and take the supernatant for use; Preparation of binder solution: Mix urea and calcium chloride in a 1:1 ratio; Preparation of mixed solution: Mix urease solution and binder solution in a 1:1 ratio to form a uniform urease-binder solution.

[0053] Step 3: After the grouting device is moved to the target slope, the urease-binder mixture is added to the slurry tank and the grouting pump is adjusted to a pulse pressure of 0.4 MPa. This pressure setting ensures the solution penetrates the soil pores while preventing mechanical damage to the seedling roots. During the pressurized grouting phase, the grouting pump pressurizes the mixed solution and delivers it to the grouting roller main pipe. The mixed solution then enters the grouting roller chamber through the main pipe grouting port. Driven by the grouting roller, the spiral blades on the side walls of the chamber unleash centrifugal force and flow diversion, guiding the slurry to the inlet of the grouting anchor pipe. The pressurized mixed solution pushes open the reverse flow valve and flows forward along the grouting anchor pipe. The petal structure at the front of the anchor pipe opens under pressure, allowing the solution to penetrate the slope soil in a targeted manner, ensuring uniform EICP reaction around the root system. During the decompression and movement phase, the petal opening at the front of the grouting anchor pipe automatically closes, significantly reducing withdrawal resistance and facilitating rolling movement of the device along the slope, making it ideal for complex terrain covered by young vegetation.

[0054] Step 4: After the EICP mixed solution grouting is completed, the entire grouting system is immediately cleaned with clean water, including key components such as the slurry box, grouting pump, roller main pipe and grouting anchor pipe. Maintain clean water flushing until clean water is discharged from the outlet pipe. After confirming that the pipe is clean, the grouting device is completely removed from the slope working surface to complete the slope reinforcement project.

[0055] Example 3:

[0056] A method for using a grouting device for riverbank ecological restoration based on EICP mineralization technology comprises the following steps:

[0057] The first step is to sow seeds of plants suitable for growing on riverbank slopes (e.g. tall fescue, ryegrass, etc.);

[0058] Step 2: Prepare EICP solution: urease solution is extracted from soybean, sword bean or watermelon seed;

[0059] It is made by mixing urea and external calcium source (calcium chloride, calcium acetate, etc.) in a ratio of 1:1;

[0060] Step 3: Open the valve switch of the grouting pipe connected to the slurry box (3), start the grouting pump (2), and adjust it to the target pressure and flow rate to ensure stable slurry delivery. If the single-phase grouting method is used: pre-mix the urease solution and the cementing fluid according to a preset volume ratio (such as 1:1), and spray and inject them into the river bank slope at one time through the grouting pump (2); if the two-phase grouting method is used: first inject the urease solution alone, and then inject the cementing fluid after an interval of 2 hours (which can also be adjusted according to the actual working conditions of the slope) to trigger the EICP mineralization reaction, thereby achieving soil reinforcement.

[0061] Step 4: The entire reinforcement process adopts multi-round grouting in stages. After sowing, the two-phase grouting method is used with a low concentration of cementing fluid (≤150mmol / L); during the seedling stage and the lawn stage, the single-phase grouting method is used with a higher concentration of cementing fluid (150mmol / L to 500mmol / L);

[0062] Step 5: After the grouting operation is completed, close the outlet valve of the slurry box (3) to cut off the slurry delivery. Pour clean water into the slurry box (3), reopen the outlet valve, and allow the clean water to flow through the slurry box (3), connecting pipe (6), roller main pipe, grouting roller (4) chamber and grouting anchor pipe (8) and other key components to flush the system. Maintain clean water flushing until the outlet pipe is drained of clean water. After confirming that the pipe is clean, remove the grouting device as a whole from the slope working surface to complete the slope reinforcement project.

Claims

1. A riverbank ecological restoration grouting device based on EICP mineralization technology, characterized in that: include: A mobile cart (1), a slurry box (3), a grouting pump (2), a connecting pipe (6), a grouting roller (4), a grouting roller main pipe (5), a grouting roller bin (10), a spiral blade (11), a grouting anchor pipe (8) and a petal opening and closing port (13); The mobile cart (1) serves as a bearing and mobile base, carrying a slurry box (3) and a grouting pump (2); the grouting pump (2) is connected to the slurry box (3) via a connecting pipe (6), and the solution in the slurry box (3) is replaced; The grouting roller (4) comprises a grouting roller main pipe (5), a grouting roller chamber (10), spiral blades (11), a grouting anchor pipe (8) and a petal opening and closing port (13); the slurry first enters the grouting roller main pipe (5) and then flows into the grouting roller (4) chamber; The spiral blades (11) are welded to the side wall of the grouting roller chamber (10), arranged at an inclined angle, and the blade thickness gradually decreases from the side close to the barrel wall to the central axis side. The spacing between the spiral blades (11) is 1.5 to 2.5 times the blade radius, and the spiral angle is 15° to 30°. The lifting force of the spiral blade (11) is calculated according to formula (1): Where: k is the structural coefficient, ρ is the density, R0 is the radius of the spiral blade (11), ω is the angular velocity, ν is the rotation speed of the grouting roller (4), and s is the spacing between the spiral blades (11); The backflow valve (14) at the grouting anchor pipe opening is opened, and the slurry enters the grouting anchor pipe (8). Under the action of continuous pressure, the petal opening and closing opening (13) at the front end of the grouting anchor pipe (8) automatically opens, and the slurry is finally sprayed out through the stainless steel spray filter.

2. A riverbank ecological restoration grouting device based on EICP mineralization technology as claimed in claim 1, characterized in that: The stainless steel spray filter is located at the connection between the conical cone and the petal mouth of the grouting anchor pipe (8), and is made of 304, 316L stainless steel and pure titanium wire. The filter has an aperture of 0.06-0.15 mm, a mesh number of 150-300 meshes, and an opening rate of ≥50%.

3. The riverbank ecological restoration grouting device based on EICP mineralization technology according to claim 1, characterized in that: The grouting roller main pipe (5) has the dual functions of a roller and a grouting pipe, is made of stainless material, has a wall thickness of 0.005mm to 0.01m, an outer diameter of 0.05m to 0.10m, and an axis length of 0.80m to 1.50m, and the side wall of the grouting roller main pipe (5) is provided with grouting holes (9) in a plum blossom pattern along the axial direction, and the spacing between the grouting holes (9) is 2.0 to 5.0 times the hole diameter.

4. The riverbank ecological restoration grouting device based on EICP mineralization technology according to claim 1, characterized in that: The grouting roller bin (10) is made of a stainless steel pipe with a wall thickness of 0.01m to 0.02m, a diameter of 0.20m to 0.50m, and an axial length of 0.60m to 1.30m. The side wall of the grouting roller bin (10) is provided with a grouting anchor pipe mounting hole (12) in a plum blossom shape, and the aperture of the grouting anchor pipe mounting hole (12) is 0.01m to 0.02m. The grouting anchor pipe (8) is mounted at the grouting anchor pipe mounting hole (12).

5. The riverbank ecological restoration grouting device based on EICP mineralization technology according to claim 1, characterized in that: The grouting roller bearing (7) adopts a container-type mechanical seal to achieve dynamic sealing between the grouting roller main pipe (5) and the grouting roller chamber (10), and its structure consists of a stationary ring, a rotating ring, an elastic element, a spring seat, a push ring, a set screw, a rotating ring auxiliary seal ring and a stationary ring auxiliary seal ring; the stationary ring is fixed to the inner wall of the grouting roller chamber (10), the rotating ring is circumferentially fixed to the grouting roller main pipe (5) by the set screw, and the elastic element provides an axial preload force to form a seal on the dynamic / static ring end faces; the rotating ring auxiliary seal ring and the stationary ring auxiliary seal ring are respectively made of fluororubber or perfluoroether rubber material with a hardness of Shore A70-90; the end face specific pressure of the mechanical seal is 0.2-0.5 MPa, the average linear speed is ≤10 m / s, and it can withstand grouting pressure fluctuations of 0.5-2.0 MPa.

6. The riverbank ecological restoration grouting device based on EICP mineralization technology according to claim 1, characterized in that: The front end of the grouting anchor pipe (8) is connected to the petal opening and closing opening (13) via a spring; when pressure is applied, the petal opening and closing opening (13) opens, and the slurry is sprayed out through the metal spray filter (15); when pressure is released, the petal opening and closing opening (13) closes, facilitating the grouting roller (4) to move along the slope.

7. The riverbank ecological restoration grouting device based on EICP mineralization technology according to claim 1, characterized in that: The grouting pump (2) uses a pulse grouting pump, and the grouting pressure range is 0 to 0.5 MPa.

8. The method for using the riverbank ecological restoration grouting device based on EICP mineralization technology according to any one of claims 1 to 7, characterized in that: The following steps are involved: Step 1: Sow seeds of plants suitable for growing on riverbank slopes; Step 2: Prepare EICP solution: urease solution is extracted from soybeans, sword beans or watermelon seeds; the cementing solution is prepared by mixing urea and external calcium source in a ratio of 1:1; Step 3: Open the valve switch of the grouting pipe connected to the slurry box (3), start the grouting pump (2), adjust it to the target pressure, and ensure stable slurry delivery; if the single-phase grouting method is adopted, that is, mixing and then injecting: pre-mix the urease solution and the cementing liquid according to the preset volume ratio, and spray and inject them into the river bank slope at one time through the grouting pump (2); if the two-phase grouting method is adopted, that is, step-by-step injection: first inject the urease solution alone, and then inject the cementing liquid after an interval of 2 hours to trigger the EICP mineralization reaction, thereby achieving soil reinforcement; Step 4: The entire reinforcement process adopts multi-round grouting in stages. After sowing the seeds, the two-phase grouting method is used with a low concentration of cementing fluid. The Ca in the low concentration cementing fluid is 2+ and urea are beneficial to promoting plant germination; single-phase grouting method and high-concentration cementing fluid are used in the seedling and lawn stages, which not only improves soil strength but also helps reduce the stress of calcium ions and urea in high-concentration cementing fluid on plants; Step 5: After the grouting operation is completed, close the outlet valve of the slurry box (3) to cut off the slurry delivery; inject clean water into the slurry box (3), reopen the outlet valve, and allow the clean water to flow through the slurry box (3), the connecting pipe (6), the roller main pipe, the grouting roller (4) chamber and the grouting anchor pipe (8) to flush the system; maintain the clean water flushing until the water outlet pipe is discharged; after confirming that the pipe is clean, remove the grouting device as a whole from the slope working surface to complete the slope reinforcement project.

9. The method for using the riverbank ecological restoration grouting device based on EICP mineralization technology according to claim 8, characterized in that: The reinforcement process adopts a multi-round dynamic grouting method in stages. After sowing and before germination, a two-phase grouting method is used and the concentration of the cementing fluid is less than 150mmol / L. The Ca in the cementing fluid is 2+ and urea are beneficial to promote plant germination; in the seedling stage and the lawn stage, the single-phase grouting method is used, and the cementing fluid concentration is 150mmol / L~500mmol / L, which improves the soil strength while reducing the Ca content in the cementing fluid. 2+ and urea stress on plants.

Images