Circulating grouting device for repairing circumferential pipe pile concrete cracks through MICP (Minimum Inductively Coupled Plasma) technology

Abstract

The utility model discloses a circulating grouting device for repairing concrete cracks of an annular pipe pile through the MICP technology. The circulating grouting device comprises a to-be-filled slurry storage barrel, a variable-diameter tee joint, a peristaltic pump, a grouting nozzle, an outflow liquid collecting tank, a pneumatic sand blasting gun and a T-shaped rubber plug. The grouting nozzle is detachably connected with one port of the reducing three-way connector, the output end of the peristaltic pump liquid conveying pipe is detachably connected with the other port of the reducing three-way connector, the input end of the peristaltic pump liquid conveying pipe is connected with the three-way pipe, and the other two ports of the three-way pipe are communicated with the microorganism grouting bacterium liquid supply end and the cementing liquid supply end respectively; the effluent collecting tank is mounted on the outer wall of the pipe pile through a bandage and an elastic rubber rope; hook rings are fixed to the two ends of the bandage respectively, and the effluent collecting tank is made of a flexible rubber material and fixed to the bandage through hook-and-loop fasteners. The device is convenient to mount and dismount, can be recycled, can ensure uniform and full filling, completely meets the MICP technology repair test of the circumferential pipe pile concrete crack, and is suitable for further popularization and application.

Description

Technical Field

[0001] The utility model relates to the technical field of grouting repair of annular pipe pile concrete cracks, in particular to a circulating grouting device used for repairing annular pipe pile concrete cracks by using a MICP technology. Background Art

[0002] In the construction and construction of marine engineering, concrete pipe piles have been widely used in the field of coastal port engineering construction due to their advantages of high strength, low cost and simple construction, and have become the main pile foundation type of high-pile wharf structure. However, during the construction hammering process or in the daily service process in the marine environment, due to the large temperature difference, uneven load distribution, complex marine seawater environment and seawater erosion and corrosion, different types of multi-source cracks will appear on the surface of the pipe piles. Under the action of long-term load, the development and extension of cracks in the pipe piles will seriously affect the overall safety of the pipe pile structure, and in severe cases, it will cause the pipe piles to be pulled, tilted and broken. In order to further develop the safe construction of marine engineering, it is necessary to repair them. However, traditional structural reinforcement methods, external steel fiberboard and chemical grouting methods are difficult to construct, have a long construction period and high repair cost in complex environments such as marine ports. Their application is subject to certain limitations and it is difficult to achieve the expected effect. When using the chemical grouting method, the repair material has certain biological toxicity, which cannot avoid harm to marine life. Therefore, it is urgent to find a pipe pile repair technology that is suitable for marine engineering environment, easy to construct, green and friendly, and low-cost.

[0003] Microbial mineralization is a common phenomenon in nature. Some microorganisms in nature can use their own metabolic activities to generate a variety of mineral crystals. Since calcium carbonate is the most widely distributed carbonate in nature and is relatively stable, with strong strength and durability, microbial deposition of calcium carbonate has always been a hot topic in the study of microbial mineralization. Microbial scientists use some specific microorganisms (such as urease-producing bacteria) to provide them with rich Ca 2+ The microbial mineralization is often called microbial induced calcite precipitation (MICP). This technology was first used to plug leaks in porous media materials, and was subsequently applied to repair surface cracks in stone materials and cement-based materials. Cement-based material repair refers to filling aggregates or directly injecting bacterial liquid and cementing liquid before grouting and repairing existing cracks in the structure, using bacteria to induce calcium carbonate deposition to achieve the purpose of plugging and filling cracks and improving the overall structural strength.

[0004] At present, the technology of microbial repair of concrete cracks in pipe piles is in the initial stage of laboratory indoors, lacking complete supporting experimental equipment, especially grouting equipment suitable for microbial repair of circumferential pipe pile cracks and other special matching equipment for marine environments. Relevant technicians mainly use laboratory ready-made test equipment for relatively simple transformation and assembly to form simple test equipment that meets the needs. However, these test equipment are cumbersome and complicated in modification and splicing process, difficult to disassemble, cannot be reused, and have a relatively limited scope of application. Utility Model Content

[0005] In order to solve the above problems, the utility model provides a cyclic grouting device for repairing concrete cracks of annular pipe piles using MICP technology, which can be easily disassembled, operated, and recycled, and can effectively ensure the sealing requirements during the experiment and improve the timeliness of crack repair during the grouting process.

[0006] In order to achieve the above technical objectives, the technical solution adopted by the utility model is:

[0007] A circulating grouting device for repairing concrete cracks of annular pipe piles using MICP technology, comprising a grout storage cylinder for filling material, a reducing tee joint, a peristaltic pump, a grouting nozzle, an effluent collection tank, a pneumatic sandblasting gun and a T-shaped rubber plug;

[0008] The grouting nozzle is detachably connected to one of the ports of the reducing three-way joint, the output end of the peristaltic pump infusion tube is detachably connected to the other port of the reducing three-way joint, the input end of the peristaltic pump infusion tube is connected to the three-way tube, and the other two ports of the three-way tube are respectively connected to the microbial grouting liquid supply end and the cementing liquid supply end;

[0009] The effluent collection tank is detachably mounted on the outer wall of the pipe pile through a binding strap and an elastic rubber rope, and is used to receive the liquid flowing out of the crack; hooks are fixed at both ends of the binding strap, and the effluent collection tank is made of flexible rubber material and is fixed to the binding strap through Velcro; hooks are provided at both ends of the elastic rubber rope, and the hooks on both sides are hooked on the hooks at both ends of the binding strap;

[0010] A liquid outlet pipe is provided at the bottom of the effluent collection tank, and the liquid outlet pipe is connected to the cementing liquid supply end through a hose;

[0011] The cyclic grouting device for repairing concrete cracks of annular pipe piles using the MICP technology includes a first working state, a second working state and a third working state;

[0012] In the first working state, the remaining port of the reducing tee joint is connected to the output end of the slurry storage cylinder to be filled;

[0013] In the second working state, the remaining port of the reducing tee joint is connected to the output end of the pneumatic sandblasting gun, and the input end of the pneumatic sandblasting gun is connected to the external air supply system;

[0014] In the third working state, the remaining port of the reducer tee is plugged with a T-shaped rubber plug.

[0015] Furthermore, the slurry storage barrel to be filled includes:

[0016] The cylinder is used to fill aggregate; the bottom end of the cylinder is provided with an opening, and the upper end is provided with a discharge port; in the first working state, the discharge port of the cylinder is connected to the port of the reducing tee joint;

[0017] The rubber plug is installed inside the cylinder and is tightly matched with the inner cavity of the cylinder;

[0018] A threaded cover, threadedly connected to the lower end of the cylinder, wherein an opening is provided in the middle of the threaded cover;

[0019] An injection push rod passes through the opening in the middle of the threaded cover and is fixedly connected to the rubber stopper, and is used to push the rubber stopper to move;

[0020] A spring is arranged between the rubber plug and the threaded cover and is sleeved on the injection push rod, wherein the upper end of the spring abuts against the rubber plug and the lower end abuts against the threaded cover;

[0021] The handle is fixedly arranged on the side wall of the cylinder.

[0022] Furthermore, the discharge port of the cylinder and the output end of the pneumatic sandblasting gun are connected to the reducing three-way joint port by means of threads.

[0023] Furthermore, the reducing tee joint is threadedly connected to the central circular hole of the grouting nozzle.

[0024] Preferably, the connection between the reducing tee joint port and other components is wrapped with waterproof tape.

[0025] Furthermore, a Velcro quilled surface is fixed on the side wall of the effluent collection tank, a Velcro round quilled surface is fixed on the surface of the strap, and the Velcro quilled surface on the side wall of the effluent collection tank is bonded to the Velcro round quilled surface on the surface of the strap.

[0026] Furthermore, a filter screen is provided at the upper opening of the effluent collection tank, and a boss is provided on the upper edge of the side wall of the effluent collection tank to fix the Velcro burred surface; when the effluent collection tank is installed on the outer wall of the pipe pile through a strap and an elastic rubber rope, the boss is in contact with the outer wall of the pipe pile.

[0027] Preferably, the top of the boss is inclined toward the opening of the effluent collection tank.

[0028] Furthermore, during grouting, the permeable gauze covers the cracks of the pipe pile concrete, the perforated gasket is arranged on the permeable gauze and covers the crack area of ​​the pipe pile concrete, the perforated gasket is fixed on the pipe pile concrete, the grouting nozzle is fixedly installed on the perforated gasket, the center of the grouting nozzle is aligned with the center of the crack, and the perforated gasket and the permeable gauze are provided with openings relative to the circular hole in the middle of the grouting nozzle.

[0029] Furthermore, the perforated gasket is fixed to the pipe pile concrete by glass glue, and the grouting nozzle is fixed to the perforated gasket by glass glue.

[0030] By adopting the above technical solution, the utility model has the following beneficial effects compared with the prior art:

[0031] The utility model pushes the aggregate into the crack by applying external pressure, and uses a pneumatic sandblasting gun to evenly and fully deliver the aggregate to the deep of the crack, which can effectively ensure that the aggregate is filled evenly and fully, and at the same time, the residual liquid that has not reacted completely can flow out smoothly during the repair process, and be collected and recycled through the outflow liquid collection tank. In addition, the device is also easy to disassemble and reuse, which fully meets the MI CP technical repair test of annular pipe pile concrete cracks and ensures the smooth progress of the research work. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0033] Figure 1 It is a schematic diagram of the utility model in the first working state;

[0034] Figure 2 It is a schematic diagram of the utility model in the second working state;

[0035] Figure 3 It is a schematic diagram of the utility model in the second working state;

[0036] Figure 4 is a schematic diagram of a syringe to be filled;

[0037] Figure 5 is a cross-sectional view of the syringe to be filled;

[0038] Figure 6 is a schematic diagram of a grouting nozzle;

[0039] Figure 7 It is a schematic diagram of a T-shaped silicone plug;

[0040] Figure 8 It is a schematic diagram of the arrangement of the perforated gasket, the water-permeable gauze and the grouting nozzle;

[0041] Fig. 9 It is a schematic diagram of the effluent collection tank being installed on the pipe pile through the binding straps and elastic rubber ropes;

[0042] Fig.10 is a schematic diagram of the strap;

[0043] Fig.11 This is a cross-sectional view of the effluent collection tank.

[0044] The labels in the figure are as follows:

[0045] Slurry storage cylinder for filler material-1; reducing tee joint-2; peristaltic pump-3; grouting nozzle-4; tee pipe-5; microbial grouting liquid supply end-6; cementing liquid supply end-7; effluent collection tank-8; filter screen-9; binding belt-10; hook-11; hook-12; elastic rubber rope-13; pneumatic sandblasting gun-14; T-shaped rubber plug-15; perforated gasket-16; water-permeable gauze-17; pipe pile-18; cylinder body-101; threaded cover-102; rubber plug-103; injection push rod-104; spring-105; handle-106; liquid outlet pipe-81; boss-82. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the utility model. Therefore, the following detailed description of the embodiments of the utility model provided in the drawings is not intended to limit the scope of the utility model for which protection is sought, but merely represents the selected embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the utility model.

[0047] See attached Figures 1 to 3 As shown, this embodiment provides a circulating grouting device for repairing concrete cracks of annular pipe piles using MICP technology, including a grout storage cylinder 1 for filling material, a reducing tee joint 2, a peristaltic pump 3, a grouting nozzle 4, an effluent collection tank 8, a pneumatic sandblasting gun 14 and a T-shaped rubber plug 15 (as shown in the attached figure). Figure 7 shown);

[0048] The grouting nozzle 4 is detachably connected to one end of the reducing tee joint 2. Specifically, a circular hole (such as the one shown in the attached figure) is provided in the middle of the grouting nozzle 4. Figure 6 As shown in the figure, the reducing tee joint 2 is threadedly connected to the central circular hole of the grouting nozzle 4. The output end of the peristaltic pump 3 infusion tube is detachably connected to the other end of the reducing tee joint 2 by threaded connection through a threaded joint, and the input end of the peristaltic pump 3 infusion tube is connected to the tee pipe 5, and the other two ends of the tee pipe 5 are respectively connected to the microbial grouting liquid supply end 6 and the cementing liquid supply end 7.

[0049] See attached Figures 9-10 As shown, the effluent collection trough 8 is detachably mounted on the outer wall of the pipe pile by means of a strap 10 and an elastic rubber rope 13, and is used to collect the liquid flowing out of the crack; hook rings 11 are fixed at both ends of the strap 10, and the effluent collection trough 8 is made of flexible rubber material. The effluent collection trough 8 is made of flexible rubber material so that it can bend according to the curvature of the outer wall of the pipe pile 18, so that it can adapt to pipe piles 18 of different diameters.

[0050] The effluent collecting tank 8 is fixed to the strap 10 by Velcro; specifically, the Velcro burr surface is fixed to the side wall of the effluent collecting tank 8 by glue or screws, and the Velcro round burr surface is sewn and fixed on the surface of the strap 10. The Velcro burr surface on the side wall of the effluent collecting tank 8 is bonded to the Velcro round burr surface on the surface of the strap 10, thereby fixing the effluent collecting tank 8 and the strap 10.

[0051] Hooks 12 are respectively provided at both ends of the elastic rubber rope 13, and the hooks 12 at both sides are respectively hooked on the hook rings 11 at both ends of the binding belt 10. The elastic force of the elastic rope 13 makes the binding belt 10 tightly embrace the pipe pile 18, thereby achieving the effect of installing the effluent collection tank 8 on the outer wall of the pipe pile. The elastic rubber rope 13 can be adjusted to be telescopic, so the setting of the binding belt 10 and the elastic rubber rope 13 can adapt to pipe piles 18 of different diameters to a certain extent.

[0052] See attached Figures 1 to 3 As shown, a liquid outlet pipe 81 is provided at the bottom of the effluent collection tank 8, and the liquid outlet pipe 81 is connected to the cementing liquid supply end 7 through a hose. When in use, the effluent collection tank 8 is fixed below the concrete crack of the pipe pile through the binding band 10 and the elastic rubber rope 13, and the remaining liquid injected into the crack that has not reacted completely will flow out during the repair process and then flow into the effluent collection tank 8. The liquid in the effluent collection tank 8 then flows back to the cementing liquid supply end 7 through the liquid outlet pipe 81 and the hose for recycling.

[0053] See attached Figure 1-3 As shown, the cyclic grouting device for repairing the concrete cracks of the annular pipe pile by the MICP technology includes a first working state, a second working state and a third working state;

[0054] In the first working state, the remaining port of the reducer tee joint 2 is connected to the output end of the slurry storage barrel 1. In the first working state, the aggregate is pushed into the crack of the pipe pile by applying external pressure.

[0055] In the second working state, the remaining port of the reducing tee joint 2 is connected to the output end of the pneumatic sandblasting gun 14, and the input end of the pneumatic sandblasting gun 14 is connected to the external air supply system; specifically, the output end of the pneumatic sandblasting gun 14 and the port of the reducing tee joint 2 are both connected by threads to facilitate the installation and disassembly of the reducing tee joint 2 and the pneumatic sandblasting gun 14. In the second working state, the pneumatic sandblasting gun delivers the aggregate evenly and fully to the deep cracks to ensure that the aggregate is filled evenly and fully.

[0056] In the third working state, the remaining port of the reducer tee 2 is plugged with a T-shaped rubber plug 15. Specifically, when in use, the connection between the port of the reducer tee 2 and the remaining components is wrapped with a waterproof tape (PTFE tape) to improve the sealing of the connection. In the third working state, the peristaltic pump 3 is used to input the cementing liquid and the bacterial liquid into the crack.

[0057] See attached Figure 8 As shown, during grouting, the permeable gauze 17 is covered on the crack of the pipe pile concrete, and the perforated gasket 16 is arranged on the permeable gauze 17 and covers the crack area of ​​the pipe pile concrete, wherein the permeable holes are evenly opened on the surface of the perforated gasket, and the perforated gasket 16 is fixed to the pipe pile by glass glue. Specifically, the perforated gasket 16 is located on the outside and covers the permeable gauze 17, and the permeable gauze 17 is glued and fixed to the pipe pile 18 by glass glue. The grouting nozzle 4 is fixedly installed on the perforated gasket 16 by glass glue, and the center of the grouting nozzle 4 is aligned with the center of the crack. When in use, a hole is opened at the relative position of the perforated gasket 16, the permeable gauze 17 and the circular hole in the middle of the grouting nozzle 4 to facilitate the injection of materials into the crack. The waste liquid and excess unreacted liquid generated by the microbial remediation will be discharged after passing through the perforated gasket 16 and the permeable gauze 17, while the aggregate filled into the crack will remain inside the crack due to the obstruction of the perforated gasket 16 and the permeable gauze 17.

[0058] When filling in the experiment, the aggregate to be filled is first driven into the crack of the pipe pile 18 through the injection cylinder 1 to be filled. After the injection, the injection cylinder 1 to be filled is unscrewed and replaced with a pneumatic sandblasting gun 14 to evenly and fully deliver the aggregate to the deep of the crack to ensure that the aggregate is evenly and fully filled. Then the pneumatic sandblasting gun 14 is replaced with a T-shaped rubber plug 15, and then the peristaltic pump 3 is started. The peristaltic pump 3 pumps the cementing liquid and the microbial liquid into the crack. During the grouting process, the excess liquid is discharged through the perforated gasket 16 and the permeable gauze 17, and is collected by the effluent collection tank 8 for recycling. After the grouting is completed, the connection between the peristaltic pump tube and the reducing tee joint 2 is disconnected.

[0059] In this embodiment, refer to the attached Figures 4-5 As shown, the injection cylinder 1 to be filled includes:

[0060] The cylinder 101 is used for filling aggregate; an opening is arranged at the bottom end of the cylinder 101, and a discharge port is arranged at the upper end; in the first working state, the discharge port of the cylinder 101 is threadedly connected to the port of the reducing tee joint 2; specifically, the discharge port of the cylinder 101 and the port of the reducing tee joint 2 are both connected by threads, so as to facilitate the connection and disassembly of the injection cylinder 1 to be filled and the reducing tee joint 2.

[0061] The rubber plug 103 is installed inside the cylinder 101 and is tightly matched with the inner cavity of the cylinder 101;

[0062] A threaded cover 102 is threadedly connected to the lower end of the cylinder 101, and an opening is provided in the middle of the threaded cover 102;

[0063] An injection push rod 104 passes through an opening in the middle of the threaded cover 102 and is fixedly connected to the rubber stopper 103, and is used to push the rubber stopper 103 to move;

[0064] The spring 105 is disposed between the rubber plug 103 and the threaded cover 102 and is sleeved on the injection push rod 104. The upper end of the spring 105 abuts against the rubber plug 103, and the lower end abuts against the threaded cover 102.

[0065] The handle 106 is fixedly disposed on the side wall of the barrel 101 to facilitate hand-held use of the syringe 1 to be filled.

[0066] When the filling injection cylinder 1 is used, first unscrew the threaded cap 102, then pull out the spring 105 and the rubber plug 103 through the injection push rod 104, then fill the aggregate into the cylinder 101, put the rubber plug 103 back after filling, and then screw on the threaded cap 102. When the aggregate needs to be extruded, the injection push rod 104 is pushed by external force, and the aggregate in the cylinder 101 is squeezed by the rubber plug 103 and squeezed out from the discharge port of the cylinder 101. During the pushing process of the injection push rod 2, the elastic force of the spring 105 plays a boosting role, making it easier for the user to push the injection push rod 104.

[0067] See attached Figure 1 and 11 As shown, a filter screen 9 is provided at the upper opening of the effluent collection tank 8 for filtering particles in the liquid, such as sand particles. A boss 82 is provided on the upper edge of the side wall of the effluent collection tank 8 to fix the Velcro burr surface; when the effluent collection tank 8 is installed on the outer wall of the pipe pile through the binding 10 and the elastic rubber rope 13, the boss 82 is attached to the outer wall of the pipe pile; the top of the boss 82 is inclined toward the opening direction of the effluent collection tank 8. When in use, the liquid discharged through the perforated gasket 16 and the water-permeable gauze 17 flows into the effluent collection tank 8 for collection after being guided by the inclined top surface of the boss 82.

[0068] The following are specific experimental steps for using the cyclic grouting device to repair concrete cracks in annular pipe piles using MICP technology:

[0069] Step 1): Before microbial repair of cracks, first observe the length, width and depth of the cracks. Use wire brushes of different sizes, blowers and other tools to remove the uneven interface around the cracks and the dust and gravel remaining inside the cracks. For cracks with a length of less than 5 cm, use a single hole and single grouting. For cracks greater than 5 cm, use multiple holes and grouting. First, cover the crack with permeable gauze 17, and then use glass glue to stick the perforated gasket 16 and the permeable gauze 17 together on the pipe pile 18. The perforated gasket 16 covers the outside of the permeable gauze 17, and then fix the grouting nozzle 4 on the perforated gasket 16 with glass glue. The center of the grouting nozzle 4 is aligned with the center of the crack, and then a hole is opened at the relative position of the perforated gasket 16, the permeable gauze 17 and the circular hole in the middle of the grouting nozzle 4 to facilitate the injection of materials into the crack.

[0070] Step 2): Pull out the injection push rod 104 at the rear end of the slurry storage barrel 1 to be filled, take out the built-in silicone plug 103, put the aggregate to be filled into the injection barrel to be filled, reinstall the silicone plug 103 and the injection push rod 104, and push the injection push rod 104 by external force to drive the aggregate into the crack.

[0071] Step 3): Remove the slurry storage barrel 1 to be filled and replace it with a pneumatic sandblasting gun 14 to deliver the aggregate evenly and fully to the deep of the crack through air pressure.

[0072] Step 4): Remove the pneumatic sandblasting gun 14 and replace it with a T-shaped rubber plug 15. The microbial liquid and the cementing liquid are input into the crack through the peristaltic pump 8 infusion tube connected to the reducer tee joint 2. The peristaltic pump is controlled to adjust the input rate to 1-3mm / min. The grouting is continued for 12 hours / time. The excess liquid in the grouting process will be discharged after passing through the perforated gasket 16 and the water-permeable gauze 17. The effluent collection tank 8 can collect the remaining liquid that has not reacted completely, and it is transported to the cementing liquid supply end 7 again through the connecting hose to continue the grouting cycle for 6 hours. The aggregate filled into the crack will remain inside the crack due to the obstruction of the perforated gasket 16 and the water-permeable gauze 17. After the repair is completed, the quick-drying silica gel on the surface of the crack can be scraped off to remove the overall grouting device.

[0073] The bacterial liquid used in this experiment is Bacillus pasteurianus, and the binder used is a mixed solution of calcium nitrate solution and urea with a concentration of 0.25-1.25 mol / L.

[0074] The above description is only the preferred implementation of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A circulating grouting device for repairing concrete cracks of annular pipe piles using MICP technology, characterized in that: It comprises a slurry storage cylinder (1), a reducing tee joint (2), a peristaltic pump (3), a grouting nozzle (4), an effluent collection tank (8), a pneumatic sandblasting gun (14) and a T-shaped rubber plug (15); The grouting nozzle (4) is detachably connected to one of the ports of the reducing three-way connector (2); the output end of the peristaltic pump (3) infusion tube is detachably connected to the other port of the reducing three-way connector (2); the input end of the peristaltic pump (3) infusion tube is connected to a three-way tube (5); and the other two ports of the three-way tube (5) are respectively connected to a microbial grouting liquid supply end (6) and a cementing liquid supply end (7); The effluent collection trough (8) is detachably mounted on the outer wall of the pipe pile through a binding belt (10) and an elastic rubber rope (13), and is used to receive the liquid flowing out of the crack; hooks (11) are respectively fixed at both ends of the binding belt (10); the effluent collection trough (8) is made of flexible rubber material and is fixed to the binding belt (10) through Velcro; hooks (12) are respectively arranged at both ends of the elastic rubber rope (13), and the hooks (12) on both sides are respectively hooked on the hooks (11) at both ends of the binding belt (10); A liquid outlet pipe (81) is provided at the bottom of the effluent collection tank (8), and the liquid outlet pipe (81) is connected to the cementing liquid supply end (7) through a hose; The cyclic grouting device for repairing concrete cracks of annular pipe piles using the MICP technology includes a first working state, a second working state and a third working state; In the first working state, the remaining port of the reducing tee joint (2) is connected to the output end of the slurry storage cylinder (1) to be filled; In the second working state, the remaining port of the reducing three-way joint (2) is connected to the output end of the pneumatic sandblasting gun (14), and the input end of the pneumatic sandblasting gun (14) is connected to an external air supply system; In the third working state, the remaining port of the reducing tee joint (2) is plugged with a T-shaped rubber plug (15).

2. The circulating grouting device for repairing annular pipe pile concrete cracks using MICP technology according to claim 1 is characterized in that: The slurry storage cylinder (1) for filling material comprises: The cylinder (101) is used to fill aggregate; the cylinder (101) is provided with an opening at the bottom end and a discharge port at the top end; in a first working state, the discharge port of the cylinder (101) is connected to a port of a reducing tee joint (2); A rubber plug (103) is installed inside the cylinder (101) and is tightly matched with the inner cavity of the cylinder (101); A threaded cover (102) is threadably connected to the lower end of the cylinder (101), and an opening is provided in the middle of the threaded cover (102); An injection push rod (104) passes through the opening in the middle of the threaded cover (102) and is fixedly connected to the rubber stopper (103) for pushing the rubber stopper (103) to move; A spring (105) is arranged between the rubber stopper (103) and the threaded cover (102), and is sleeved on the injection push rod (104). The upper end of the spring (105) abuts against the rubber stopper (103), and the lower end abuts against the threaded cover (102); The handle (106) is fixedly arranged on the side wall of the cylinder (101).

3. The circulating grouting device for repairing concrete cracks of annular pipe piles using MICP technology according to claim 2 is characterized in that: The discharge port of the cylinder (101) and the output end of the pneumatic sandblasting gun (14) are connected to the port of the reducing three-way joint (2) by means of threads.

4. The circulating grouting device for repairing annular pipe pile concrete cracks using MICP technology according to claim 1 is characterized in that: The reducing tee joint (2) is threadedly connected to the central circular hole of the grouting nozzle (4).

5. The circulating grouting device for repairing concrete cracks of annular pipe piles using MICP technology according to claim 1 is characterized in that: The connection between the reducer tee joint (2) port and other components is wrapped with waterproof tape.

6. The circulating grouting device for repairing concrete cracks of annular pipe piles using MICP technology according to claim 1 is characterized in that: The side wall of the effluent collection tank (8) is fixed with a Velcro quilt surface, and the surface of the binding strap (10) is fixed with a Velcro quilt surface. The Velcro quilt surface on the side wall of the effluent collection tank (8) is bonded to the Velcro quilt surface on the surface of the binding strap (10).

7. The circulating grouting device for repairing concrete cracks of annular pipe piles using MICP technology according to claim 6 is characterized in that: A filter screen (9) is arranged at the upper opening of the effluent collection tank (8), and a boss (82) is arranged on the upper edge of the side wall of the effluent collection tank (8) for fixing the Velcro quilted surface; when the effluent collection tank (8) is installed on the outer wall of the pipe pile through the binding belt (10) and the elastic rubber rope (13), the boss (82) is in contact with the outer wall of the pipe pile.

8. The circulating grouting device for repairing concrete cracks of annular pipe piles using MICP technology according to claim 7 is characterized in that: The top of the boss (82) is arranged to be inclined toward the opening direction of the effluent collection tank (8).

9. The circulating grouting device for repairing concrete cracks of annular pipe piles using MICP technology according to claim 1 is characterized in that: During grouting, the water-permeable gauze (17) covers the cracks in the pipe pile concrete, the perforated gasket (16) is arranged on the water-permeable gauze (17) and covers the crack area of ​​the pipe pile concrete, the perforated gasket (16) is fixed on the pipe pile concrete, the grouting nozzle (4) is fixedly mounted on the perforated gasket (16), the center of the grouting nozzle (4) is aligned with the center of the crack, and the perforated gasket (16) and the water-permeable gauze (17) are provided with openings at positions relative to the circular hole in the middle of the grouting nozzle (4).

10. The circulating grouting device for repairing concrete cracks of annular pipe piles using MICP technology according to claim 9 is characterized in that: The perforated gasket (16) is fixed to the pipe pile concrete by glass glue, and the grouting nozzle (4) is fixed to the perforated gasket (16) by glass glue.

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