Device for repairing pipe pile concrete cracks through low-temperature microorganism mineralization

Abstract

The utility model discloses a device for repairing pipe pile concrete cracks through low-temperature microorganism mineralization. The device comprises a first heat preservation barrel, a second heat preservation barrel, an acrylic plate, a gear pump and an air pump. The first heat preservation barrel and the second heat preservation barrel are filled with microorganism grouting bacteria liquid and cementing liquid respectively, two grouting holes are formed in the lower end of the acrylic plate, a liquid drainage hole is formed in the upper end of the acrylic plate, and the input ends of the two independent gear pumps are immersed in the liquid contained in the first heat preservation barrel and the liquid contained in the second heat preservation barrel respectively. The output ends of the two independent gear pumps are respectively connected with two grouting holes in the lower end of the acrylic plate; and the air outlet end of the air pump is immersed in the microorganism grouting bacteria liquid contained in the first heat preservation barrel. The device is convenient to mount and dismount, can be recycled, can completely meet the requirement of a microbial mineralization technology repair test for the concrete cracks of the tubular pile under the low-temperature condition, ensures the stable proceeding of research work, and is suitable for further popularization and application.

Description

Technical Field

[0001] This utility model relates to the field of grouting repair technology for concrete cracks in circumferential pipe piles, specifically a device for low-temperature microbial mineralization repair of concrete cracks in pipe piles. Background Technology

[0002] In marine engineering construction, concrete pipe piles, with their outstanding advantages of high strength, low cost, and convenient construction, are widely used in coastal port engineering projects and have become a widely applied type of pile foundation in high-pile wharf structures. However, during the hammering stage of pipe pile construction and during daily service in the marine environment, due to factors such as large temperature differences, uneven load distribution, the complex and unpredictable marine environment, and seawater erosion, various types of cracks easily appear on the surface of the pipe piles. Under long-term load, these cracks will continue to develop and expand, posing a serious threat to the overall safety of the pipe pile structure. In extreme cases, it can even lead to serious consequences such as pile tension, tilting, or even column breakage. In the field of marine engineering safety construction, repair work is essential to promote its further development. However, traditional repair methods, such as structural reinforcement, external steel fiberboard cladding, and chemical grouting, face many challenges in the complex environment of marine ports. These methods are difficult to implement, have long construction periods, and are expensive to repair, thus limiting their application and often failing to achieve the desired results. When using chemical grouting methods, the repair materials have a certain degree of biotoxicity, and harm to marine life is unavoidable. Therefore, it is urgent to find a pipe pile repair technology that is suitable for marine engineering environments, easy to construct, environmentally friendly, and cost-effective.

[0003] Microbial mineralization is a widespread phenomenon in nature. In nature, some microorganisms can generate various mineral crystals through their metabolic activities. Calcium carbonate, as the most widely distributed carbonate in nature, possesses characteristics such as stability, high strength, and durability. Therefore, the microbial deposition of calcium carbonate has always been a key area of ​​research in microbial mineralization. Scientists in the field of microbiology utilize specific microorganisms, such as urease-producing bacteria, to provide them with calcium-rich... 2+Nutrients, including nitrogen sources, promote the rapid precipitation of calcite-type calcium carbonate crystals, which have excellent cementing properties. This microbial mineralization process is commonly known as Microbial Induced Carbonate Precipitation (MICP). This technology was initially applied to sealing leaks in porous media and has since been extended to repairing surface cracks in stone and cement-based materials. For cement-based materials, the specific procedure involves pre-filling with aggregate or directly injecting bacterial solutions and cementing solutions before grouting existing cracks in the structure. Through bacterial-induced calcium carbonate deposition, the cracks are sealed and filled, thereby improving the overall structural strength.

[0004] Currently, the technology for repairing concrete cracks in pipe piles using microbial methods is still in its early stages of laboratory research. At this stage, it faces challenges such as inadequate experimental equipment, particularly a lack of grouting devices suitable for low-temperature microbial mineralization repair of concrete cracks in pipe piles.

[0005] Therefore, the purpose of this utility model is to provide a grouting device that can be used for low-temperature microbial mineralization repair of concrete cracks in pipe piles. Utility Model Content

[0006] To address the aforementioned problems, this invention provides a device for low-temperature microbial mineralization repair of concrete cracks in pipe piles.

[0007] To achieve the above-mentioned technical objectives, the technical solution adopted by this utility model is as follows:

[0008] A device for low-temperature microbial mineralization repair of concrete cracks in pipe piles includes a first insulation tank, a second insulation tank, an acrylic plate, a gear pump, and an air pump.

[0009] The first and second insulated buckets are respectively filled with microbial grouting liquid and cementing liquid. The lower end of the acrylic plate is provided with two grouting holes, and the upper end of the acrylic plate is provided with a drain hole. The input ends of two independent gear pumps are respectively immersed in the liquids contained in the first and second insulated buckets, and the output ends of the two independent gear pumps are respectively connected to the two grouting holes at the lower end of the acrylic plate.

[0010] The air outlet of the air pump is immersed in the microbial grouting solution contained in the first insulated container.

[0011] As one possible implementation, both the first and second insulated containers are further provided with a temperature regulating component. The temperature regulating component includes a heating rod and a temperature regulator for controlling the heating power of the heating rod. The temperature regulator is electrically connected to the heating rod.

[0012] As one possible implementation, the grouting hole is further provided with an internal thread, and the output end of the gear pump is threadedly connected to the grouting hole.

[0013] As one possible implementation, a liquid recovery assembly is further provided below the acrylic plate. The liquid recovery assembly includes an outflow liquid recovery tank, a strap, and an elastic rubber rope. The outflow liquid recovery tank is detachably installed on the outer wall of the pipe pile via the strap and the elastic rubber rope to collect the liquid flowing out of the crack.

[0014] The outflow liquid recovery tank is made of flexible rubber and has a drain pipe at the bottom. The drain pipe is connected to the second insulated tank through a connecting pipe. The outflow liquid recovery tank is fixed to the strap with Velcro.

[0015] The strap is fixed with hooks at both ends, and the elastic rubber rope is provided with hooks at both ends. The hooks on both sides are hooked onto the hooks at both ends of the strap.

[0016] As one possible implementation, the sidewall of the effluent recovery tank is further provided with a hook and loop fastener with a bristle-like surface, and the surface of the strap is provided with a hook and loop fastener with a rounded bristle-like surface. The hook and loop fastener with a bristle-like surface on the sidewall of the effluent recovery tank is bonded to the hook and loop fastener with a rounded bristle-like surface on the strap.

[0017] As one possible implementation, a filter screen is further provided at the upper opening of the effluent recovery tank.

[0018] As one possible implementation, the upper edge of the side wall of the effluent recovery tank with the hook and loop fastener is provided with a boss; when the effluent recovery tank is installed on the outer wall of the pipe pile by the straps and elastic rubber rope, the boss is in contact with the outer wall of the pipe pile.

[0019] As one possible implementation, the top of the boss is further inclined toward the opening of the outflow recovery tank.

[0020] As one possible implementation, the air pump is further provided with a filter screen at the air inlet end, and a microfiltration membrane is fixedly provided at the drain hole.

[0021] As one possible implementation, further, during grouting, a ring of glass glue is applied to the edge of the acrylic sheet, and the acrylic sheet with glass glue is then pasted to the crack in the concrete of the pipe pile, so that the acrylic sheet covers the crack in the pipe pile, wherein the interval between the acrylic sheet and the pipe pile is 1 to 2 cm.

[0022] By adopting the above technical solution, the beneficial effects of this utility model compared with the prior art are as follows:

[0023] This invention effectively isolates the external low-temperature environment by covering the cracked area requiring grouting with an acrylic plate; the insulated container ensures the temperature of the liquid inside, allowing grouting to proceed normally even under low-temperature conditions. Furthermore, the device is easy to disassemble and reuse, fully meeting the requirements for microbial mineralization repair technology for cracks in pipe pile concrete under low-temperature conditions, ensuring the smooth progress of research work. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the usage state of this utility model;

[0026] Figure 2 A schematic diagram showing the effluent collection tank being installed on the pipe pile using straps and elastic rubber ropes;

[0027] Figure 3 This is a diagram illustrating the straps.

[0028] Figure 4 This is a cross-sectional view of the effluent collection tank;

[0029] Figure 5 This is a schematic diagram of an acrylic sheet.

[0030] The labels in the diagram are as follows:

[0031] First insulation tank - 1; Second insulation tank - 2; Acrylic sheet - 3; Gear pump - 4; Air pump - 5; Liquid recovery assembly - 6; Connecting pipe - 7; Movable telescopic scaffold - 8; Glass glue - 9; Pipe pile - 10; Grouting hole - 31; Drain hole - 32; Outflow liquid recovery tank - 61; Straps - 62; Elastic rubber rope - 63; Filter screen - 64; Boss - 611; Hook - 621; Hook - 631. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model. Therefore, the following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely represents selected embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0033] See attached document Figure 1 and 5 As shown, this embodiment provides a device for low-temperature microbial mineralization repair of concrete cracks in pipe piles, including a first insulation tank 1, a second insulation tank 2, an acrylic plate 3, a gear pump 4, and an air pump 5;

[0034] The first insulated tank 1 and the second insulated tank 2 respectively contain microbial grouting solution and cementing solution. In this embodiment, both the first insulated tank 1 and the second insulated tank 2 are equipped with a temperature regulating component, which includes a heating rod and a temperature regulator for controlling the heating power of the heating rod. The temperature regulator is electrically connected to the heating rod. The insulated tanks ensure the temperature of the liquid inside, allowing grouting to proceed normally even under low-temperature conditions.

[0035] Two grouting holes 31 are provided at the lower end of the acrylic plate 3, and a drain hole 32 is provided at the upper end of the acrylic plate 3. A microfiltration membrane 3 is adhered and fixed at the drain hole 32 to filter the liquid discharged from the drain hole 32. The input ends of two independent gear pumps 4 are respectively immersed in the liquid contained in the first insulation tank 1 and the second insulation tank 2, and the output ends of the two independent gear pumps 4 are respectively connected to the two grouting holes 31 at the lower end of the acrylic plate 3. In this embodiment, the grouting holes 31 are provided with internal threads, and the output ends of the gear pumps 4 are threadedly connected to the grouting holes 31 to facilitate the connection and disassembly of the output ends of the gear pumps 4 to the acrylic plate 3.

[0036] The outlet of the air pump 5 is immersed in the microbial grouting solution contained in the first insulated container 1 to inject oxygen required for bacterial survival into the solution. In this embodiment, the inlet of the air pump 5 is equipped with a filter to remove dust from the air.

[0037] In this embodiment, components other than the acrylic sheet 3, such as the insulated bucket and the air pump 5, can be placed on the movable telescopic scaffold 8 to facilitate the movement of the device.

[0038] When grouting is required, apply a ring of silicone sealant 9 around the edge of the acrylic sheet 3, and then attach the silicone sealant-coated acrylic sheet 3 to the crack in the concrete of the pipe pile, so that the acrylic sheet 3 covers the crack in the pipe pile; wherein, the interval between the acrylic sheet 3 and the pipe pile 10 is 1-2 cm. Covering the crack area that needs grouting with the acrylic sheet can effectively isolate it from the external low temperature environment.

[0039] After the silicone sealant 9 has completely solidified, the insulation temperature of the insulation tank is set. The input ends of the two independent gear pumps 4 are respectively immersed in the liquid contained in the first insulation tank 1 and the second insulation tank 2. The output ends of the two independent gear pumps 4 are respectively connected to the two grouting holes 31 at the lower end of the acrylic plate 3. The oxygen required for bacterial survival is injected into the microbial grouting solution in the first insulation tank 1 by the air pump 5, and the bonding liquid and microbial grouting solution are introduced into the cavity formed by the acrylic plate 3 and the pipe pile 10 by the gear pumps 4. The liquid in the cavity will seep into the cracks of the pipe pile. During the grouting process, the excess liquid will be discharged through the microfiltration membrane at the drain hole 32.

[0040] See attached document Figures 1-4 As shown, a liquid recovery assembly 6 is provided below the acrylic plate 3. The liquid recovery assembly 6 includes an outflow liquid recovery tank 61, a strap 62, and an elastic rubber rope 63. The outflow liquid recovery tank 61 is detachably installed on the outer wall of the pipe pile through the strap 62 and the elastic rubber rope 63 to collect the liquid flowing out of the crack.

[0041] The effluent recovery tank 61 is made of flexible rubber, allowing it to adapt to pipe piles 10 of different diameters. A filter screen 64 is installed at the upper opening of the effluent recovery tank 61 to filter particulate matter in the liquid, such as sand particles. A drain pipe is installed at the bottom of the effluent recovery tank 61, which is connected to the second insulation tank 2 via a connecting pipe 7. The effluent recovery tank 61 is fixed to the strap 62 using Velcro; specifically, the side wall of the effluent recovery tank 61 has a burred Velcro surface, and the surface of the strap 62 has a rounded Velcro surface. The burred Velcro surface on the side wall of the effluent recovery tank 61 and the rounded Velcro surface on the strap 62 are bonded together, thus fixing the effluent collection tank 8 to the strap 10.

[0042] The binding strap 62 has hooks 621 fixed at both ends, and the elastic rubber rope 63 has hooks 631 at both ends. The hooks 631 on both sides hook onto the hooks 621 at both ends of the binding strap 62. The binding strap 62 is held tightly to the pipe pile 10 by the elasticity of the elastic rubber rope 63, thereby achieving the effect of installing the effluent collection tank 61 on the outer wall of the pipe pile. The elastic rubber rope 63 can be adjusted for extension and retraction, so the binding strap 62 and the elastic rubber rope 63 can be adapted to pipe piles 10 of different diameters to a certain extent.

[0043] See attached document Figure 4 As shown, a boss 611 is provided on the upper edge of the side wall of the effluent recovery tank 61 with the hook and loop fastener. When the effluent recovery tank 61 is installed on the outer wall of the pipe pile by the strap 62 and the elastic rubber rope 63, the boss 611 is in contact with the outer wall of the pipe pile. The top of the boss 611 is inclined towards the opening of the effluent collection tank 61. In use, the liquid discharged from the drain hole 32 is guided by the inclined top surface of the boss 611 and flows into the effluent collection tank 61 for collection.

[0044] In use, the outflow collection tank 61 is fixed to the bottom of the acrylic plate 3 by the strap 62 and the elastic rubber rope 63. During the grouting process, the liquid flowing out from the drain hole 32 will flow into the outflow collection tank 61. The liquid in the outflow collection tank 61 will then return to the second heat preservation tank 2 for recycling through the drain pipe at the bottom and the connecting pipe 7.

[0045] The following are the specific experimental steps for using the device for low-temperature microbial mineralization repair of concrete cracks in pipe piles:

[0046] Step 1): Before microbial repair of the cracks, first observe the length, width, and depth of the cracks. Use tools such as wire brushes of different sizes and blowers to remove the uneven surfaces around the cracks and the residual dust and gravel inside the cracks. Next, cover and adhere an acrylic sheet to the crack of the pipe pile with glass glue, controlling the gap between the acrylic sheet 3 and the pipe pile 10 to be 1-2 cm. Then, use glass glue to adhere and fix the microfiltration membrane to the waste liquid discharge hole 32.

[0047] Step 2): The microbial inoculum and cementing solution from the first and second insulation tanks are introduced into the cavity formed by the acrylic plate 3 and the pipe pile 10 through the gear pump inlet pipe. The liquid in the cavity will seep into the cracks of the pipe pile. During this process, the input rate of the gear pump is controlled at 3-5 mm / min, and grouting is continued for 12-24 hours. Excess liquid during the grouting process will be discharged through the microfiltration membrane 3 at the discharge hole 32. The discharged liquid can be collected in the outflow collection tank 61 and returned to the second insulation tank 2 through the connecting pipe. After the repair is completed, the silicone sealant on the surface of the crack can be scraped off and the entire grouting device can be removed.

[0048] The bacterial culture used in this experiment was Bacillus pasteurellii, and the cementing solution used was a mixture of calcium nitrate solution and urea with a concentration of 0.25–1.25 mol / L.

[0049] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A device for low-temperature microbial mineralization repair of concrete cracks in pipe piles, characterized in that, Includes a first insulated container (1), a second insulated container (2), an acrylic sheet (3), a gear pump (4), and an air pump (5); The first heat preservation bucket (1) and the second heat preservation bucket (2) are respectively filled with microbial grouting liquid and cementing liquid. The lower end of the acrylic plate (3) is provided with two grouting holes (31) and the upper end of the acrylic plate (3) is provided with a drain hole (32). The input ends of the two independent gear pumps (4) are respectively immersed in the liquids contained in the first heat preservation bucket (1) and the second heat preservation bucket (2). The output ends of the two independent gear pumps (4) are respectively connected to the two grouting holes (31) at the lower end of the acrylic plate (3). The air outlet of the air pump (5) is immersed in the microbial grouting solution contained in the first insulated container (1).

2. The device for low-temperature microbial mineralization repair of concrete cracks in pipe piles according to claim 1, characterized in that, Both the first heat preservation container (1) and the second heat preservation container (2) are equipped with a temperature regulating component. The temperature regulating component includes a heating rod and a temperature regulator for controlling the heating power of the heating rod. The temperature regulator is electrically connected to the heating rod.

3. The device for low-temperature microbial mineralization repair of concrete cracks in pipe piles according to claim 1, characterized in that, The grouting hole (31) is provided with an internal thread, and the output end of the gear pump (4) is threadedly connected to the grouting hole (31).

4. The device for low-temperature microbial mineralization repair of concrete cracks in pipe piles according to claim 1, characterized in that, A liquid recovery assembly (6) is provided below the acrylic plate (3). The liquid recovery assembly (6) includes an outflow liquid recovery tank (61), a strap (62), and an elastic rubber rope (63). The outflow liquid recovery tank (61) is detachably installed on the outer wall of the pipe pile through the strap (62) and the elastic rubber rope (63) to collect the liquid flowing out of the crack. The outflow recovery tank (61) is made of flexible rubber and has a drain pipe at the bottom. The drain pipe is connected to the second heat preservation tank (2) through a connecting pipe (7). The outflow recovery tank (61) is fixed to the strap (62) by Velcro. The two ends of the strap (62) are respectively fixed with hooks (621), and the two ends of the elastic rubber rope (63) are respectively provided with hooks (631). The hooks (631) on both sides are respectively hooked onto the hooks (621) at both ends of the strap (62).

5. The device for low-temperature microbial mineralization repair of concrete cracks in pipe piles according to claim 4, characterized in that, The side wall of the effluent recovery tank (61) is fixed with a hook and loop fastener with a bristle surface, and the surface of the strap (62) is fixed with a hook and loop fastener with a round bristle surface. The hook and loop fastener with a bristle surface on the side wall of the effluent recovery tank (61) is bonded to the hook and loop fastener with a round bristle surface on the surface of the strap (62).

6. The device for low-temperature microbial mineralization repair of concrete cracks in pipe piles according to claim 4, characterized in that, A filter screen (64) is provided at the upper opening of the effluent recovery tank (61).

7. The device for low-temperature microbial mineralization repair of concrete cracks in pipe piles according to claim 5, characterized in that, The effluent recovery tank (61) has a boss (611) on the upper edge of the side wall of the hook and loop fastener. When the effluent recovery tank (61) is installed on the outer wall of the pipe pile by the strap (62) and the elastic rubber rope (63), the boss (611) is in contact with the outer wall of the pipe pile.

8. The device for low-temperature microbial mineralization repair of concrete cracks in pipe piles according to claim 7, characterized in that, The top of the boss (611) is inclined toward the opening of the outflow liquid recovery tank (61).

9. The device for low-temperature microbial mineralization repair of concrete cracks in pipe piles according to claim 1, characterized in that, The air pump (5) is equipped with a filter screen at its air inlet end, and a microfiltration membrane is fixedly installed at the drain hole (32).

10. The device for low-temperature microbial mineralization repair of concrete cracks in pipe piles according to claim 1, characterized in that, During grouting, a ring of glass glue (9) is applied to the edge of the acrylic plate (3), and the acrylic plate (3) with glass glue is pasted to the crack in the concrete of the pipe pile so that the acrylic plate (3) covers the crack in the pipe pile; wherein, the interval between the acrylic plate (3) and the pipe pile (10) is 1 to 2 cm.

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