Concrete crack repairing device and method based on microbial repairing

Abstract

The invention relates to the technical field of concrete repairing, and discloses a concrete crack repairing device and method based on microbial repairing, and the concrete crack repairing device comprises a trolley body and a mixing tank mounted above the trolley body. According to the invention, the rotary table rotates stably, the rotary table drives the stirring rod to move synchronously when rotating, and the plum blossom-shaped groove in the inclined surface of the guide block adopts a special curved surface contour design, so that the top of the stirring rod can be accurately guided, and the stirring rod naturally forms radial and axial composite reciprocating motion while circularly moving along with the rotary table; the hollow stirring plate is obliquely arranged, meanwhile, the stirring rod can be directly linked with the adjusting assembly when sliding in the axial direction, the piston slides in the hollow connecting frame to transmit acting force, the expansion plate is driven to flexibly stretch out and draw back, and the stirring coverage range is adjusted by dynamically adapting to the material amount change in the tank. By means of the design, the mixing uniformity of microbial colonies, the calcium source and the slow-release nutrient solution is greatly improved, the stable activity of the colonies is effectively guaranteed, and a solid foundation is laid for the follow-up repairing effect.

Description

Technical Field

[0001] This invention belongs to the field of concrete repair technology, specifically, it relates to a concrete crack repair device and method based on microbial repair. Background Technology

[0002] Concrete, as one of the most widely used main materials in the construction engineering field, is highly susceptible to cracking during construction, curing, and service due to factors such as temperature changes, loads, and shrinkage deformation. The presence of cracks not only reduces the integrity, load-bearing capacity, and durability of concrete structures, but also allows moisture and corrosive media to penetrate the interior, accelerating structural deterioration and, in severe cases, even threatening engineering safety. Therefore, crack repair is one of the core requirements for the maintenance of concrete structures.

[0003] Traditional crack repair techniques often employ methods such as chemical grouting and physical filling. While chemical grouting materials can quickly fill cracks, they suffer from poor environmental friendliness, insufficient compatibility with the concrete matrix, and susceptibility to aging and cracking, leading to secondary damage later on. Physical filling, on the other hand, struggles to fully fill the tiny voids in cracks, resulting in limited repair effectiveness. In recent years, microbial repair technology has gradually emerged due to its advantages such as environmental friendliness and long-lasting repair effects. It repairs cracks by generating calcium carbonate precipitates through microbial metabolism that match the properties of the concrete.

[0004] However, existing microbial remediation devices require a constant mix of bacterial colonies during use. However, the stirring rods in these devices only have a single circular motion, which limits the range of agitation of the microbial colonies with raw materials such as calcium sources and slow-release nutrient solutions. This can easily lead to uneven mixing, resulting in insufficient mixing of materials in certain areas. This directly affects the activity of microorganisms and the subsequent remediation effect, making it difficult to meet the high efficiency and stability requirements of engineering remediation.

[0005] In view of this, the present invention is proposed. Summary of the Invention

[0006] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by the present invention is as follows:

[0007] A concrete crack repair device based on microbial remediation includes a trolley body and a mixing tank mounted on top.

[0008] The mixing tank is equipped with a cover plate on top and a peristaltic pump at the bottom, which is used to spray out the mixed microbial colonies;

[0009] A turntable is rotatably mounted on the cover plate, and the turntable is connected to a drive motor mounted on the cover plate. A stirring rod is inserted into the turntable, and a hollow stirring plate is installed at the bottom of the stirring rod. The hollow stirring plate is in an inclined state. The top of the stirring rod is in contact with a guide block provided on the cover plate, and the guide block has an inclined surface with a plum blossom groove. The plum blossom groove is slidably connected to the stirring rod. During the rotation of the stirring rod driven by the turntable, the stirring rod drives the hollow stirring plate to slide back and forth in the radial direction, and the hollow stirring plate also slides back and forth in the axial direction, thereby improving the stirring effect.

[0010] Furthermore, as the hollow stirring plate slides along the axial direction, it presses the adjustment component on the cover plate, which is used to adjust the stirring area of ​​the hollow stirring plate.

[0011] In a preferred embodiment of the present invention, the bottom of the trolley body is equipped with four omnidirectional wheels, all of which are equipped with brakes. The trolley body is equipped with a positioning frame, and the positioning frame is equipped with a handle, which is provided with an anti-slip sleeve.

[0012] In a preferred embodiment of the present invention, the mixing tank is provided with a feed door on its side wall, and an observation window is also provided on the mixing tank. The input end of the peristaltic pump is connected to the inner cavity of the mixing tank, and a connecting pipe is installed at the output end of the peristaltic pump. A nozzle is installed at the end of the connecting pipe, and the connecting pipe is snapped onto a plastic buckle provided on the side wall of the mixing tank.

[0013] In a preferred embodiment of the present invention, the output end of the drive motor passes through the cover plate and the guide block, and a coupling is installed at the end of the output end, and a transmission shaft is installed on the coupling. The transmission shaft is connected to the turntable. A partition is installed on the cover plate, and the partition is rotatably connected to the turntable. The partition is used to divide the transmission area where the guide block is located.

[0014] In a preferred embodiment of the present invention, the turntable has a notch, which is in the shape of a straight line. A sealing plate is slidably disposed on the notch. The sealing plate is movably connected to the stirring rod, and an adjustment component is installed at the bottom of the sealing plate. A sliding plate is installed on the side wall of the sealing plate. A limit rod is installed through the sliding plate, and limit seats are installed at both ends of the limit rod. The limit seats are installed on the turntable.

[0015] In a preferred embodiment of the present invention, a slide rod is installed on the top of the stirring rod, the slide rod is slidably disposed in the plum blossom groove, a pressure plate is installed on the stirring rod, and a compression spring is sleeved on the stirring rod. One end of the compression spring is clamped to the pressure plate, and the other end of the compression spring is clamped to the sealing plate. The compression spring is used to drive the slide rod to always be in contact with the plum blossom groove.

[0016] In a preferred embodiment of the present invention, the adjusting component includes a bracket, a piston mounted on the bracket, a hollow connecting frame slidably disposed on the piston, and the outer shell of the hollow connecting frame being connected to the stirring rod. The inner cavity of the hollow connecting frame is in communication with the inner cavity of the hollow stirring plate, and an extension plate is slidably disposed in the inner cavity of the hollow stirring plate.

[0017] A method for repairing concrete cracks based on microbial remediation, comprising the following steps:

[0018] Step 1: Work preparation; Move the device to the concrete crack repair work area using the handle with anti-slip sleeve on the trolley body and the universal wheels with brake function at the bottom, and step on the universal wheel brake to fix it.

[0019] Step 2: Raw material feeding. Open the feed door on the side wall of the mixing tank and add active microbial colonies, calcium source and appropriate amount of slow-release nutrient solution and other repair raw materials into the inner cavity of the mixing tank in sequence. Control the raw material feeding ratio according to the crack size. After feeding, close and lock the feed door.

[0020] Step 3: Mixing and stirring; Start the drive motor on the cover plate. The drive motor drives the turntable to rotate through the transmission shaft. The turntable drives the stirring rod to rotate. The slide bar at the top of the stirring rod slides in the plum blossom groove of the guide block and remains in contact under the action of the compression spring, so that the stirring rod drives the hollow stirring plate to make radial and axial reciprocating motion. At the same time, the hollow stirring plate slides axially to squeeze the adjustment component. The piston slides in the hollow connecting frame and pushes the extension plate to adjust the stirring area. Observe the mixing state through the observation window of the mixing tank until the microbial colonies and all raw materials are evenly mixed, then turn off the drive motor.

[0021] Step 4: Crack spraying; Remove the connecting pipe clipped to the plastic buckle, hold the nozzle and aim it at the concrete crack area; Start the peristaltic pump at the bottom of the mixing tank. The peristaltic pump draws the evenly mixed microbial colony suspension from the inner cavity of the mixing tank and delivers it to the nozzle through the connecting pipe. Spray it evenly along the crack direction to ensure that the suspension fully wets the inner wall of the crack and saturates and fills the crack gaps. After spraying, turn off the peristaltic pump and re-clip the connecting pipe to the plastic buckle.

[0022] Step 5: Curing and Acceptance; After spraying, cover the crack surface with a moisturizing film to maintain a humid environment and ensure the conditions required for microbial colonization and metabolism. Control the curing time according to the ambient temperature; During the curing period, check the moisturizing status regularly and replenish water in time; After the curing is completed, remove the moisturizing film, observe the flatness of the crack surface, and test the density and mechanical properties of the repaired area. If it meets the requirements of the concrete structure, the repair is completed. If it does not meet the standards, repeat steps 4 and 5 for secondary repair.

[0023] Compared with the prior art, the present invention has the following advantages:

[0024] This invention utilizes a rotating turntable that drives a stirring rod to move synchronously. The plum blossom groove on the inclined surface of the guide block features a special curved contour design, providing precise guidance to the top of the stirring rod. This allows the stirring rod to naturally form a composite reciprocating motion in both the radial and axial directions as it moves circumferentially with the turntable. The hollow stirring plate is arranged at an angle. This structure can create multi-directional agitation of materials at different depths and in different areas within the tank during the composite motion. Simultaneously, the axial sliding of the stirring rod directly links with the adjustment component. Through the sliding force of the piston within the hollow connecting frame, the force is transmitted, driving the extension plate to flexibly extend and retract, dynamically adapting to changes in the amount of material in the tank and adjusting the stirring coverage. This design significantly improves the mixing uniformity of microbial colonies with calcium sources and slow-release nutrient solutions, effectively ensuring the stable activity of the colonies and laying a solid foundation for subsequent remediation effects.

[0025] The specific embodiments of the present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0026] In the attached diagram:

[0027] Figure 1 A three-dimensional diagram of a concrete crack repair device based on microbial repair;

[0028] Figure 2 A cross-sectional view of a mixing tank for a microbial-based concrete crack repair device;

[0029] Figure 3 A concrete crack repair device based on microbial repair. Figure 2 Enlarged view of point A in the middle;

[0030] Figure 4 A cross-sectional view of the cover plate of a concrete crack repair device based on microbial remediation;

[0031] Figure 5 A concrete crack repair device based on microbial repair. Figure 4 Enlarged view at point B in the middle;

[0032] Figure 6 A partial view of a microbial-based concrete crack repair device Figure 1 ;

[0033] Figure 7 A partial view of a microbial-based concrete crack repair device Figure 2 .

[0034] In the diagram: 1. Mixing tank; 11. Cart body; 111. Positioning frame; 112. Handle; 12. Cover plate; 121. Feed door; 122. Observation window; 123. Partition; 13. Peristaltic pump; 131. Connecting pipe; 132. Nozzle; 133. Plastic clip;

[0035] 2. Turntable; 21. Drive motor; 211. Drive shaft; 22. Stirring rod; 221. Sealing plate; 222. Notch; 223. Slide plate; 224. Limiting rod; 225. Limiting seat; 226. Pressure plate; 227. Compression spring; 23. Hollow stirring plate; 231. Extension plate; 232. Hollow connecting frame; 233. Piston; 234. Bracket; 24. Guide block; 241. Inclined surface; 242. Plum blossom groove; 243. Slide rod. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate the present invention.

[0037] Example 1:

[0038] like Figures 1 to 7 As shown, a concrete crack repair device based on microbial remediation includes a trolley body 11 and a mixing tank 1 mounted on top.

[0039] A cover plate 12 is installed on the top of the mixing tank 1, and a peristaltic pump 13 is installed at the bottom of the mixing tank 1. The peristaltic pump 13 is used to spray out the mixed microbial colonies.

[0040] A turntable 2 is rotatably mounted on the cover plate 12, and the turntable 2 is connected to the drive motor 21 mounted on the cover plate 12. A stirring rod 22 is inserted into the turntable 2, and a hollow stirring plate 23 is installed at the bottom of the stirring rod 22. The hollow stirring plate 23 is in an inclined state, and the top of the stirring rod 22 is in contact with the guide block 24 provided on the cover plate 12. The guide block 24 has an inclined surface 241, and a plum blossom groove 242 is provided on the inclined surface 241. The plum blossom groove 242 is slidably connected to the stirring rod 22. During the rotation of the stirring rod 22 driven by the turntable 2, the stirring rod 22 drives the hollow stirring plate 23 to slide back and forth in the radial direction, and the hollow stirring plate 23 also slides back and forth in the axial direction, thereby improving the stirring effect.

[0041] Furthermore, as the hollow stirring plate 23 slides along the axial direction, it presses against the adjustment component on the cover plate 12. The adjustment component is used to adjust the stirring area of ​​the hollow stirring plate 23.

[0042] like Figures 1 to 7As shown in the specific embodiment, the bottom of the trolley body 11 is equipped with four omnidirectional wheels, all of which have a braking function. A positioning frame 111 is installed on the trolley body 11, and a handle 112 is installed on the positioning frame 111, with an anti-slip sleeve on the handle 112. The combination of the omnidirectional wheels with braking function, the anti-slip handle 112, and the positioning frame 111 makes the movement and fixation of the trolley body 11 more flexible and reliable, reduces the difficulty of handling and positioning in on-site operations, and adapts to the needs of different working scenarios.

[0043] like Figures 1 to 7 As shown, the mixing tank 1 is further provided with a feed door 121 on its side wall, and an observation window 122 on its surface. The input end of the peristaltic pump 13 is connected to the inner cavity of the mixing tank 1, and a connecting pipe 131 is installed at the output end of the peristaltic pump 13. A nozzle 132 is installed at the end of the connecting pipe 131, and the connecting pipe 131 is snapped onto a plastic clip 133 on the side wall of the mixing tank 1. The feed door 121 facilitates the feeding of raw materials, the observation window 122 allows for real-time monitoring of the material mixing status, and the cooperation of the connecting pipe 131, nozzle 132, and plastic clip 133 enables convenient use and storage of the spraying tool, further improving the ease of use and functionality of the mixing tank 1 and ensuring the continuity of the work process.

[0044] Example 2:

[0045] The difference between the above embodiments and this embodiment is that: Figures 1 to 7 As shown, the output end of the drive motor 21 passes through the cover plate 12 and the guide block 24, and a coupling is installed at the end of the output end. A drive shaft 211 is installed on the coupling, and the drive shaft 211 is connected to the turntable 2. A partition 123 is installed on the cover plate 12, and the partition 123 is rotatably connected to the turntable 2. The partition 123 is used to divide the transmission area where the guide block 24 is located. The drive shaft 211 enhances the transmission stability of the connection between the drive motor 21 and the turntable 2. The partition 123 protects the transmission area where the guide block 24 is located, preventing materials or impurities from entering and affecting the operation of the transmission components, extending the service life of components such as the guide block 24 and the turntable 2, and improving the operational reliability of the device.

[0046] like Figures 1 to 7As shown in the specific embodiment, the turntable 2 has a notch 222, which is straight. A sealing plate 221 is slidably mounted on the notch 222, and the sealing plate 221 is movably connected to the stirring rod 22. An adjustment component is installed at the bottom of the sealing plate 221, and a sliding plate 223 is installed on the side wall of the sealing plate 221. A limiting rod 224 is installed through the sliding plate 223, and limiting seats 225 are installed at both ends of the limiting rod 224. The limiting seats 225 are installed on the turntable 2. The straight notch 222 provides space for the radial sliding of the stirring rod 22. The sealing plate 221 ensures the sealing of the area of ​​the turntable 2. The cooperation of the sliding plate 223, the limiting rod 224, and the limiting seats 225 restricts the movement trajectory of the sealing plate 221, indirectly ensuring the stability of the sliding of the stirring rod 22 and avoiding movement deviation that would affect the stirring effect.

[0047] like Figures 1 to 7 As shown, furthermore, a slide rod 243 is installed on the top of the stirring rod 22, and the slide rod 243 is slidably disposed in the plum blossom groove 242. A pressure plate 226 is installed on the stirring rod 22, and a compression spring 227 is sleeved on the stirring rod 22. One end of the compression spring 227 is engaged with the pressure plate 226, and the other end of the compression spring 227 is engaged with the sealing plate 221. The compression spring 227 is used to drive the slide rod 243 to always be in contact with the plum blossom groove 242. The sliding cooperation between the slide rod 243 and the plum blossom groove 242 accurately transmits the guiding force, and the compression spring 227 provides continuous elastic support for the stirring rod 22 through the pressure plate 226, ensuring that the slide rod 243 and the plum blossom groove 242 are tightly fitted, ensuring the continuity of the compound motion of the stirring rod 22, and improving the motion accuracy of the stirring mechanism.

[0048] like Figures 1 to 7 As shown, the adjustment assembly further includes a bracket 234, on which a piston 233 is mounted. A hollow connecting frame 232 is slidably mounted on the piston 233, and the outer shell of the hollow connecting frame 232 is connected to the stirring rod 22. The inner cavity of the hollow connecting frame 232 is in communication with the inner cavity of the hollow stirring plate 23, and an extension plate 231 is slidably mounted on the inner cavity of the hollow stirring plate 23. The bracket 234 provides a stable mounting base for the adjustment assembly. The sliding cooperation between the piston 233 and the hollow connecting frame 232 can convert the axial force of the stirring rod 22 into the extension and retraction force of the extension plate 231, realizing the dynamic adjustment of the stirring area of ​​the hollow stirring plate 23. This allows the device to adapt to the mixing requirements of different material quantities, improving the adaptability of the stirring mechanism.

[0049] This invention also discloses a method for repairing concrete cracks based on microbial remediation, the steps of which are as follows:

[0050] Step 1: Work preparation; Move the device to the concrete crack repair work area using the handle 112 with anti-slip sleeve on the trolley body 11 and the universal wheels with brake function at the bottom, and step on the universal wheel brake fixing device.

[0051] Step 2: Raw material feeding. Open the feed door 121 on the side wall of mixing tank 1, and add active microbial colonies, calcium source and appropriate amount of slow-release nutrient solution and other repair raw materials into the inner cavity of mixing tank 1 in sequence. Control the raw material feeding ratio according to the crack size. After feeding, close and lock the feed door 121.

[0052] Step 3: Mixing and stirring; Start the drive motor 21 on the cover plate 12. The drive motor 21 drives the turntable 2 to rotate through the transmission shaft 211. The turntable 2 drives the stirring rod 22 to rotate. The slide rod 243 at the top of the stirring rod 22 slides in the plum blossom groove 242 of the inclined surface 241 of the guide block 24 and remains in contact under the action of the compression spring 227, so that the stirring rod 22 drives the hollow stirring plate 23 to make radial and axial reciprocating motion. At the same time, the hollow stirring plate 23 slides axially to squeeze the adjustment component. The piston 233 slides in the hollow connecting frame 232 and pushes the extension plate 231 to extend and retract to adjust the stirring area. Observe the mixing state through the observation window 122 of the mixing tank 1 until the microbial colonies and each raw material are evenly mixed, and then turn off the drive motor 21.

[0053] Step 4: Crack spraying; Remove the connecting pipe 131 that is clipped to the plastic clip 133, and hold the nozzle 132 to aim at the concrete crack area; Start the peristaltic pump 13 at the bottom of the mixing tank 1. The peristaltic pump 13 draws the evenly mixed microbial colony suspension from the inner cavity of the mixing tank 1 and delivers it to the nozzle 132 through the connecting pipe 131. Spray the suspension at a uniform speed along the crack direction to ensure that the suspension fully wets the inner wall of the crack and saturates and fills the crack gaps. After the spraying is completed, turn off the peristaltic pump 13 and re-clip the connecting pipe 131 to the plastic clip 133.

[0054] Step 5: Curing and Acceptance; After spraying, cover the crack surface with a moisturizing film to maintain a humid environment and ensure the conditions required for microbial colonization and metabolism. Control the curing time according to the ambient temperature; During the curing period, check the moisturizing status regularly and replenish water in time; After the curing is completed, remove the moisturizing film, observe the flatness of the crack surface, and test the density and mechanical properties of the repaired area. If it meets the requirements of the concrete structure, the repair is completed. If it does not meet the standards, repeat steps 4 and 5 for secondary repair.

[0055] The implementation principle of a concrete crack repair device based on microbial repair according to the present invention is as follows: First, the device is moved to the concrete crack repair work area and fixed by using the universal wheels with brake function at the bottom of the trolley body 11 and the handle 112 on the positioning frame 111. Then, the feed door 121 on the side wall of the mixing tank 1 is opened, and microbial colonies and various raw materials required for repair are added into the mixing tank 1. After closing the feed door 121, the device can be started for subsequent operations.

[0056] After startup, the drive motor 21 on the cover plate 12 starts to run. The drive motor 21 drives the turntable 2 to rotate through the transmission shaft 211 (the partition 123 on the cover plate 12 divides and protects the transmission area where the guide block 24 is located). When the turntable 2 rotates, it drives the stirring rod 22 inserted on it to rotate synchronously. The slide rod 243 at the top of the stirring rod 22 always slides in the plum blossom groove 242 of the guide block 24. The plum blossom groove 242 is opened on the inclined surface 241 of the guide block 24. Under the elastic force of the compression spring 227, the slide rod 243 and the plum blossom groove 242 remain in contact, so that the stirring rod 22 slides back and forth in both the radial and axial directions while rotating with the turntable 2, thereby driving the hollow stirring plate 23 with the bottom inclined to move synchronously.

[0057] During this process, the sealing plate 221 at the notch 222 on the turntable 2 slides radially with the stirring rod 22, and the sliding plate 223 slides along the limiting rod 224 to ensure the stability of the movement of the stirring rod 22. At the same time, when the hollow stirring plate 23 slides axially, it will squeeze the adjustment component. The piston 233 on the bracket 234 in the adjustment component slides in the hollow connecting frame 232. Since the inner cavity of the hollow connecting frame 232 is connected to the inner cavity of the hollow stirring plate 23, it will push the extension plate 231 of the inner cavity of the hollow stirring plate 23 to extend or retract, thereby realizing the dynamic adjustment of the stirring area. Combined with the inclined structure and composite motion trajectory of the hollow stirring plate 23, the mixing uniformity of microbial colonies and raw materials in the mixing tank 1 is greatly improved. The internal mixing situation can be observed in real time through the observation window 122 on the mixing tank 1.

[0058] Once mixing is complete, the peristaltic pump 13 at the bottom of the mixing tank 1 is activated. The peristaltic pump 13 extracts the uniformly mixed microbial colonies from the inner cavity of the mixing tank 1 and delivers them to the nozzle 132 at the end via the connecting pipe 131 at the output end of the peristaltic pump 13. The operator holds the nozzle 132 and aims it at the concrete crack, precisely spraying the microbial colonies onto the crack to complete the repair work. After the work is completed, the connecting pipe 131 can be clipped onto the plastic buckle 133 on the side wall of the mixing tank 1 for storage. The entire process utilizes the device's portability, high mixing efficiency, and precise spraying to achieve convenient and efficient repair of concrete cracks.

[0059] After spraying, the microbial colonies will establish themselves in the moist environment inside the cracks and initiate metabolic activities. The calcium sources present in the concrete matrix and environment at the cracks (such as calcium hydroxide from concrete hydration products and calcium ions in the environment) provide nutrients for the microorganisms. Through metabolic processes such as respiration, the microorganisms produce carbonate ions. These carbonate ions combine with calcium ions in the cracks, gradually forming calcium carbonate precipitates inside the cracks and on the inner surface. As the microorganisms continue to metabolize, the calcium carbonate precipitates accumulate, filling the tiny voids inside the cracks and achieving physical filling. Furthermore, the generated calcium carbonate precipitates bond tightly with the concrete matrix, forming a continuous structural layer, restoring the integrity and density of the concrete. Simultaneously, the strength of the calcium carbonate precipitates matches that of the concrete matrix, effectively improving the mechanical properties of the cracked area and achieving the repair purpose. The repair progress can be judged by observing the surface condition of the cracks. Once the calcium carbonate precipitates have solidified and stabilized, the microbial repair of the cracks is complete.

[0060] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A concrete crack repair device based on microbial remediation, comprising a trolley body (11) and a mixing tank (1) mounted on top, characterized in that: The mixing tank (1) is equipped with a cover plate (12) on top and a peristaltic pump (13) is installed at the bottom of the mixing tank (1). The peristaltic pump (13) is used to spray out the mixed microbial colonies. A turntable (2) is rotatably mounted on the cover plate (12), and the turntable (2) is connected to the drive motor (21) mounted on the cover plate (12). A stirring rod (22) is inserted into the turntable (2), and a hollow stirring plate (23) is installed at the bottom of the stirring rod (22). The hollow stirring plate (23) is in an inclined state. The top of the stirring rod (22) is in contact with the guide block (24) provided on the cover plate (12), and the guide block (24) has an inclined surface (241) and a plum blossom groove (242) is provided on the inclined surface (241). The plum blossom groove (242) is slidably connected to the stirring rod (22). During the rotation of the stirring rod (22) driven by the turntable (2), the stirring rod (22) drives the hollow stirring plate (23) to slide back and forth in the radial direction, and the hollow stirring plate (23) also slides back and forth in the axial direction to improve the stirring effect. Furthermore, as the hollow stirring plate (23) slides along the axial direction, it presses the adjustment component on the cover plate (12), which is used to adjust the stirring area of ​​the hollow stirring plate (23).

2. The concrete crack repair device based on microbial remediation according to claim 1, characterized in that, The bottom of the trolley body (11) is equipped with four universal wheels, all of which have a braking function. The trolley body (11) is equipped with a positioning frame (111), and the positioning frame (111) is equipped with a handle (112), and the handle (112) is provided with an anti-slip sleeve.

3. The concrete crack repair device based on microbial remediation according to claim 1, characterized in that, The mixing tank (1) is provided with a feed door (121) on its side wall. The mixing tank (1) is also provided with an observation window (122). The input end of the peristaltic pump (13) is connected to the inner cavity of the mixing tank (1). The output end of the peristaltic pump (13) is equipped with a connecting pipe (131). The end of the connecting pipe (131) is equipped with a nozzle (132). The connecting pipe (131) is snapped onto a plastic buckle (133) provided on the side wall of the mixing tank (1).

4. The concrete crack repair device based on microbial remediation according to claim 1, characterized in that, The output end of the drive motor (21) passes through the cover plate (12) and the guide block (24), and a coupling is installed at the end of the output end. A transmission shaft (211) is installed on the coupling. The transmission shaft (211) is connected to the turntable (2). A partition (123) is installed on the cover plate (12). The partition (123) is rotatably connected to the turntable (2), and the partition (123) is used to divide the transmission area where the guide block (24) is located.

5. The concrete crack repair device based on microbial remediation according to claim 1, characterized in that, The turntable (2) has a notch (222) in the shape of a straight line. A sealing plate (221) is slidably arranged on the notch (222). The sealing plate (221) is movably connected to the stirring rod (22). An adjustment component is installed at the bottom of the sealing plate (221). A sliding plate (223) is installed on the side wall of the sealing plate (221). A limit rod (224) is installed through the sliding plate (223). Limit seats (225) are installed at both ends of the limit rod (224). The limit seats (225) are installed on the turntable (2).

6. The concrete crack repair device based on microbial remediation according to claim 5, characterized in that, A slide rod (243) is installed on the top of the stirring rod (22). The slide rod (243) is slidably disposed in the plum blossom groove (242). A pressure plate (226) is installed on the stirring rod (22). A compression spring (227) is sleeved on the stirring rod (22). One end of the compression spring (227) is engaged with the pressure plate (226), and the other end of the compression spring (227) is engaged with the sealing plate (221). The compression spring (227) is used to drive the slide rod (243) to always be in contact with the plum blossom groove (242).

7. A concrete crack repair device based on microbial remediation according to claim 5, characterized in that, The adjustment assembly includes a bracket (234), on which a piston (233) is mounted. A hollow connecting frame (232) is slidably disposed on the piston (233), and the outer shell of the hollow connecting frame (232) is connected to the stirring rod (22). The inner cavity of the hollow connecting frame (232) is connected to the inner cavity of the hollow stirring plate (23), and an extension plate (231) is slidably disposed in the inner cavity of the hollow stirring plate (23).

8. A method for repairing concrete cracks based on microbial remediation, characterized in that, The concrete crack repair device based on microbial remediation according to any one of claims 1 to 7, and the concrete crack repair method based on microbial remediation, comprises the following steps: Step 1: Work preparation; Move the device to the concrete crack repair work area by using the handle (112) with anti-slip sleeve on the trolley body (11) and the universal wheel with brake function at the bottom, and step on the universal wheel brake fixing device. Step 2: Raw material feeding. Open the feed door (121) on the side wall of the mixing tank (1) and add active microbial colonies, calcium source and appropriate amount of slow-release nutrient solution and other repair raw materials into the inner cavity of the mixing tank (1) in sequence. Control the raw material feeding ratio according to the crack size. After feeding, close and lock the feed door (121). Step 3: Mixing and stirring; Start the drive motor (21) on the cover plate (12). The drive motor (21) drives the turntable (2) to rotate through the transmission shaft (211). The turntable (2) drives the stirring rod (22) to rotate. The slide rod (243) at the top of the stirring rod (22) slides in the plum blossom groove (242) of the inclined surface (241) of the guide block (24). Under the action of the compression spring (227), it remains in contact, so that the stirring rod (22) drives the hollow stirring plate (23) to make radial and axial reciprocating motion. At the same time, the hollow stirring plate (23) slides axially to squeeze the adjustment component. The piston (233) slides in the hollow connecting frame (232) to push the extension plate (231) to extend and retract to adjust the stirring area. Observe the mixing state through the observation window (122) of the mixing tank (1). After the microbial colonies and each raw material are evenly mixed, turn off the drive motor (21). Step 4: Crack spraying; Remove the connecting pipe (131) that is clipped to the plastic clip (133), hold the nozzle (132) and aim it at the concrete crack area; start the peristaltic pump (13) at the bottom of the mixing tank (1), the peristaltic pump (13) draws the evenly mixed microbial colony suspension from the inner cavity of the mixing tank (1), and delivers it to the nozzle (132) through the connecting pipe (131), spraying it evenly along the crack direction to ensure that the suspension fully wets the inner wall of the crack and saturates and fills the crack gaps. After the spraying is completed, turn off the peristaltic pump (13) and re-clip the connecting pipe (131) to the plastic clip (133); Step 5: Curing and Acceptance; After spraying, cover the crack surface with a moisturizing film to maintain a humid environment and ensure the conditions required for microbial colonization and metabolism. Control the curing time according to the ambient temperature; During the curing period, check the moisturizing status regularly and replenish water in time; After the curing is completed, remove the moisturizing film, observe the flatness of the crack surface, and test the density and mechanical properties of the repaired area. If it meets the requirements of the concrete structure, the repair is completed. If it does not meet the standards, repeat steps 4 and 5 for secondary repair.

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