Electrodeposition repair of high flow length cracks in foundations using flexible electrolytic cells and methods

Abstract

The application discloses a flexible electrolytic cell for electrodepositing and repairing a high-permeation long crack of a foundation and a method, and belongs to the technical field of repairing damaged foundation cracks. The flexible electrolytic cell comprises an electrolytic cell mechanism, an automatic adsorption mechanism and an electrolyte automatic supply mechanism. The automatic adsorption mechanism can adsorb the electrolytic cell mechanism on the surface of the damaged foundation without punching, gluing and causing secondary damage. The electrolyte automatic supply mechanism can monitor the concentration change in real time through a concentration sensor, and automatically supply and replace the electrolyte, thereby reducing the dilution influence of high-permeation water on the electrolyte. The flexible electrolytic cell has an expansion function and can be used in multiple groups in series along the foundation cracks. The device has the characteristics of lightness, flexibility and reusability, can be adapted to concave-convex or special-shaped foundation surfaces, and realizes continuous coverage of long cracks. After liquid injection and power-on, the electrodepositing product is used to block the water-permeation cracks of the foundation, and the anti-permeation performance of the damaged foundation can be improved by more than 90% after seven days of repair.

Description

Technical Field

[0001] This invention belongs to the field of repair technology for water seepage cracks in damaged foundations, and relates to a flexible electrolytic cell and method for electrodeposition repair of long cracks with high seepage in foundations. Background Technology

[0002] During service, foundations often crack due to factors such as load, temperature changes, and shrinkage. The presence of cracks not only affects the structural appearance but also allows moisture and harmful ions to infiltrate, accelerating steel corrosion and reducing structural durability. Electrodeposition technology, as an emerging crack repair method, applies a direct current electric field to the crack area, utilizing ions in the electrolyte to undergo a deposition reaction at the crack, generating a dense repair product to seal the crack. Studies have shown that electrodeposition treatment can generate deposits such as Mg(OH)2 and CaCO3 in the crack area, significantly reducing the crack's permeability coefficient and improving overall density.

[0003] Chinese patent CN112982517A discloses a three-electrode system and method for electrodeposition repair of water-seeping cracks in underground structures. It discloses a device for carrying the electrolyte, which employs an external container or electrolyte colloid to hold the electrolyte. When an acrylic basin is used as the external container, an external auxiliary electrode is placed inside the container, and the container is pre-fixed with silicone sealant and then sealed with epoxy. When an electrolyte colloid is used, the electrolyte colloid is directly applied to the concrete area of ​​the crack to be repaired, and the external auxiliary electrode is fixed. The installation of the internal auxiliary electrode and cable requires drilling into the damaged foundation.

[0004] While the aforementioned patented technology can achieve internal repair of micro-cracks, it still has the following drawbacks when repairing structural damage caused by high water permeability and long cracks:

[0005] 1. Damaged foundations, under high water pressure, uneven settlement, and soil and water pressure, are prone to developing long cracks with a width exceeding 0.15 mm and a length exceeding 1 m, with a single crack seeping 3-5 L / d. These cracks, characterized by high seepage and continuous erosion, gradually dilute the electrolyte, leading to a sharp drop in ion concentration and a significant reduction in deposition rate. Existing technologies rely on manual, timed electrolyte replacement, which is labor-intensive, has a slow response, and cannot maintain a stable concentration, severely affecting repair efficiency and sealing effect. It is particularly unsuitable for electrodeposition repair of foundations with high permeability and long cracks.

[0006] 2. The external container for carrying electrolyte needs to be installed by drilling or gluing. Drilling damages the damaged foundation and aggravates the cracks. As for gluing, since the damaged underground foundation is in a damp state for a long time, the adhesion of the waterproof adhesive on the damp surface is greatly reduced, making it difficult and not secure to attach the external container for carrying electrolyte. In addition, the continuous leakage of water from the cracks will gradually fill the external container for carrying electrolyte. The self-weight of the external container for carrying electrolyte increases significantly after it is filled with water, and it is very easy to fall off under the action of gravity.

[0007] 3. External containers that hold electrolyte cannot be flexibly adjusted in size according to different crack lengths. Only a single liquid storage container can be used, and the length of water seepage cracks that can be repaired at one time is limited, resulting in poor applicability.

[0008] Therefore, developing a specialized electrolytic cell that can automatically maintain electrolyte concentration, self-absorb and fix without damage, and expand according to crack length to meet the requirements for repairing foundations damaged by high water permeability and long cracks is of great significance for promoting the rapid repair of damaged foundations. Summary of the Invention

[0009] The purpose of this invention is to overcome the shortcomings of the prior art and provide a flexible electrolytic cell and repair method for electrodeposition repair of long-length cracks in foundations with high permeability, so as to achieve efficient repair of damp and damaged foundations with rapid and reliable fixation, flexible fit, no damage, expandability, customization and reusability.

[0010] The technical problem solved by this invention is achieved through the following technical solution:

[0011] A flexible electrolytic cell for electrodeposition repair of long-length cracks in foundation with high permeability is characterized by comprising an electrolytic cell mechanism, an automatic adsorption mechanism, and an automatic electrolyte replenishment mechanism, wherein the automatic adsorption mechanism is used to automatically adsorb the electrolytic cell mechanism at the crack location of the damaged foundation.

[0012] The electrolytic cell mechanism includes a fixed frame, a waterproof membrane, a flexible anode, a sealing ring, a wire lead-out pipe, and an electrolyte injection and discharge pipe. A sealing ring is installed at the crack in the damaged foundation to be repaired. Wire lead-out pipes and electrolyte injection and discharge pipes are installed at both ends of the sealing ring. A rubber cap is installed at the end of the electrolyte injection and discharge pipe. A waterproof membrane covers the outside of the sealing ring. The space between the waterproof membrane and the sealing ring forms a sealed cavity for containing the electrolyte. A flexible anode is installed in this sealed cavity, and the lead-out wire of the flexible anode is led out by the wire lead-out pipe. A fixed frame is pressed onto the outside of the waterproof membrane.

[0013] The automatic adsorption mechanism includes a crossbar and an automatic suction cup. A horizontally arranged crossbar is pressed onto the front end face of the fixed frame, and an automatic suction cup is installed at both ends of the crossbar. The automatic suction cup is used to press the electrolytic cell mechanism into the cracked position of the damaged foundation.

[0014] The automatic electrolyte replenishment mechanism includes a replenishment pump, a concentration sensor, and a controller. A high-concentration electrolyte tank is connected to the electrolyte injection pipe at the upper end of the sealing ring via the replenishment pump. A concentration sensor is connected to the electrolyte injection pipe at the lower end of the sealing ring via a T-junction. The concentration sensor monitors the electrolyte concentration in the sealed cavity in real time. When the concentration is lower than a set threshold, the controller drives the replenishment pump to automatically replenish the high-concentration electrolyte, maintaining the electrodeposition reaction to proceed continuously and efficiently.

[0015] Moreover, the automatic adsorption mechanism consists of two sets arranged on the front end face of the fixed frame.

[0016] Furthermore, it also includes a fixed frame clamping mechanism, which includes a self-tightening bolt. The self-tightening bolt is threadedly installed in the middle of the crossbar, and a connecting rib is provided on the fixed frame at a position corresponding to the crossbar. The rear end of the self-tightening bolt is abutted against the connecting rib of the fixed frame.

[0017] Moreover, the flexible anode is fixed on the waterproof membrane.

[0018] Furthermore, the sealing ring is 1-3cm thick and made of silicone, fluororubber or EPDM rubber, with a closed ring cross-section, forming a sealing fit with the waterproof membrane and the damaged foundation surface.

[0019] Furthermore, the waterproof membrane is a flexible polymer membrane, including but not limited to nylon, PVC, and PE; the flexible anode is a flexible carbon-based or metal-based material, including but not limited to carbon fiber mesh, stainless steel mesh, aluminum foil, and zinc foil; and the fixing frame is made of plastic, including but not limited to PVC and nylon.

[0020] An electrodeposition method for repairing long-length cracks with high permeability in foundations, characterized by comprising the following steps:

[0021] Step 1: Select the appropriate number of flexible electrolytic cells for electrodeposition repair based on the length of the cracks in the damaged foundation to be repaired;

[0022] Step 2: Adsorb each electrodeposition repair flexible electrolytic cell onto the surface of the damaged foundation along the direction of the crack;

[0023] Step 3: Apply a waterproof membrane along the crack direction on the crack that is not covered by the electrodeposition repair flexible electrolytic cell. Press the two ends of the waterproof membrane onto the bottom of the fixing frame of the upper and lower electrodeposition repair flexible electrolytic cells respectively.

[0024] Step 4: Connect the lead wires from the adjacent electrodeposition repair flexible electrolytic cells, connect the adjacent electrolyte injection and drainage pipes with hoses, connect the electrolyte injection and drainage pipe at the first end to the high-concentration electrolyte tank with a replenishment pump, connect the electrolyte injection and drainage pipe in the middle to the concentration sensor with a hose, and connect the electrolyte injection and drainage pipe at the tail end to the drainage solenoid valve.

[0025] Step 5: Inject electrolyte into the sealed cavity through the electrolyte injection and discharge pipe located at the first end until the electrolyte fills the entire series-connected electrodeposition repair flexible electrolytic cell.

[0026] Step 6: The concentration sensor monitors the concentration of the electrolyte in the flexible electrolytic cell for electrodeposition repair in real time. When the concentration is detected to be lower than the preset threshold, the replenishment pump and the drain solenoid valve are started at the same time to complete the discharge of low-concentration electrolyte and the replenishment of high-concentration electrolyte.

[0027] Step 7: Using the flexible anode on the waterproof membrane as the anode and the steel reinforcement inside the damaged foundation as the cathode, apply DC voltage to perform electrodeposition repair.

[0028] Furthermore, the method for adsorbing each electrodeposition repair flexible electrolytic cell onto the damaged foundation along the direction of the crack is as follows:

[0029] Step 2.1: Align the sealing ring with the location of the concrete crack and attach it to the damaged foundation;

[0030] Step 2.2: Cover the outside of the sealing ring with the waterproof membrane with the flexible anode attached, and then press the fixing frame firmly onto the waterproof membrane;

[0031] Step 2.3: Press the crossbar with the automatic suction cup onto the fixed frame, start the automatic suction cup to extract air, so that the electrolytic cell mechanism is pressed tightly onto the damaged foundation by negative pressure;

[0032] Step 2.4: Tighten the self-tightening bolts to further press the fixing frame firmly against the damaged foundation.

[0033] The advantages and positive effects of this invention are:

[0034] 1. This invention, through the automatic electrolyte replenishment mechanism, can monitor and stabilize the electrolyte concentration in real time, solving the problems of rapid electrolyte dilution and a sharp drop in deposition efficiency caused by damaged foundations, high water pressure underground structures with high permeability, and long cracks. The electrodeposition reaction is continuous and efficient, significantly shortening the repair cycle of damaged foundation cracks and improving the density and bearing stability of the foundation structure. At the same time, this invention uses an automatic suction cup to adsorb and fix the electrolytic cell mechanism, eliminating the need to stick waterproof glue or drill holes on the damaged foundation, protecting the damaged foundation and appearance, and making installation and disassembly convenient and quick. The flexible electrolytic cell of this invention can deform and fit flat, curved, irregular, and uneven damaged foundations, breaking through the limitations of rigid devices. This invention can be extended in length as needed to adapt to cracks of different lengths and meet the repair needs of cracks.

[0035] 2. This invention employs a dual fixing method combining negative pressure adsorption and self-tightening bolts, enabling the electrodeposition repair of flexible electrolytic cells to remain stable even on damp and damaged foundations, preventing them from falling off due to increased weight from water seepage.

[0036] 3. This electrodeposition repair flexible electrolytic cell is made of lightweight materials and can be reused at other crack locations after disassembly, reducing repair costs.

[0037] 4. The sealed cavity structure of the present invention enables the electrolyte to fully contact the crack area, resulting in a uniform and efficient electrodeposition reaction, and the repair effect is far superior to the traditional external container solution. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the structure of the present invention;

[0039] Figure 2 This is an exploded view of the present invention;

[0040] Figure 3 This is an exploded view of the electrolytic cell mechanism of the present invention;

[0041] Figure 4 This is a schematic diagram of the structure of the present invention installed on cracks in a damaged foundation (the replenishment pump, controller and drain solenoid valve are omitted).

[0042] Figure 5 for Figure 4 Enlarged view of part A;

[0043] Figure 6 This is a schematic diagram of the deformation test of the fixed frame according to the present invention;

[0044] Figure 7 This is a schematic diagram illustrating the repair of cracked areas not covered by the electrolytic cell according to the present invention.

[0045] Figure 8 This is a schematic diagram of the structure of the ultrasonic velocity measurement points arranged along the longitudinal direction of the crack according to the present invention;

[0046] Figure 9 This is a schematic diagram of the ultrasonic testing principle of the present invention. The dashed line in the diagram represents the ultrasonic transmission path.

[0047] Figure 10 This is a bar chart comparing the ultrasonic wave velocity before and after the electrodeposition repair of concrete cracks according to the present invention (with a line graph showing the wave velocity increase rate).

[0048] Figure 11 This is a bar chart comparing the water seepage rate before and after the electrodeposition repair of concrete cracks according to the present invention.

[0049] Explanation of reference numerals in the attached figures

[0050] 1-Automatic suction cup, 2-Horizontal bar, 3-Lead wire, 4-Wire lead-out tube, 5-Electrolyte injection and drainage tube, 6-Self-tightening bolt, 7-Fixing frame, 8-Waterproof membrane, 9-Sealing ring, 10-Plastic cap, 11-Crack, 12-Electrodeposition repair of flexible electrolytic cell, 13-Damaged foundation, 14-Hose, 15-Flexible anode, 16-Sediment in the upper electrolytic cell repair area, 17-Crack not covered by the electrolytic cell, 18-Sediment in the lower electrolytic cell repair area, 19-Transmitter, 20-Receiver, 21-Concentration sensor. Detailed Implementation

[0051] Combination Figures 1-11 The embodiments of the present invention will be described in further detail below:

[0052] An innovative flexible electrolytic cell for electrodeposition repair of long, high-permeability cracks in foundations is characterized by comprising an electrolytic cell mechanism, an automatic adsorption mechanism, and an automatic electrolyte replenishment mechanism. The automatic adsorption mechanism is used to automatically adsorb the electrolytic cell mechanism onto the damaged foundation 13. The high-permeability, long cracks refer to cracks 11 with a length of more than 1m and a seepage rate of more than 200ml / h.

[0053] The electrolytic cell mechanism includes a fixed frame 7, a waterproof membrane 8, a flexible anode 15, a sealing ring 9, a wire lead-out pipe 4, and an electrolyte injection and drainage pipe 5. A sealing ring 9 is installed at the crack 11 of the damaged foundation 13 to be repaired. Wire lead-out pipes 4 and electrolyte injection and drainage pipes 5 are installed at both ends of the sealing ring 9. A rubber cap 10 is installed at the end of the electrolyte injection and drainage pipe 5. A waterproof membrane 8 covers the outside of the sealing ring 9, and the space between the waterproof membrane 8 and the sealing ring 9 forms a sealed cavity for containing the electrolyte. A flexible anode 15 is installed in this sealed cavity and fixed to the waterproof membrane 8. The lead-out wire 3 of the flexible anode 15 is led out by the wire lead-out pipe 4. A fixed frame 7 is pressed onto the outside of the waterproof membrane 8; the fixed frame 7 is used to press the waterproof membrane 8 tightly onto the damaged foundation 13, and the sealing ring 9 prevents electrolyte leakage.

[0054] The automatic electrolyte replenishment mechanism includes a replenishment pump, a concentration sensor 21, and a controller. A high-concentration electrolyte tank is connected to the electrolyte injection pipe 5 at the upper end of the sealing ring 9 via the replenishment pump. A concentration sensor 21 is connected to the electrolyte injection pipe 5 at the lower end of the sealing ring 9 via a T-junction. The concentration sensor 21 monitors the electrolyte concentration in the sealed cavity in real time. When the concentration is lower than a set threshold, the controller drives the replenishment pump to automatically replenish the high-concentration electrolyte, maintaining the electrodeposition reaction to proceed continuously and efficiently.

[0055] In this embodiment, the automatic adsorption mechanism consists of two sets arranged on the upper and lower front surfaces of the fixed frame 7. The automatic adsorption mechanism includes crossbars 2 and automatic suction cups 1. Horizontally arranged crossbars 2 are symmetrically pressed onto the upper and lower ends of the front surface of the fixed frame 7. Automatic suction cups 1 are installed on the left and right ends of each crossbar 2. In this embodiment, the automatic suction cups 1 used are from Zosio, model A-1500-2. These automatic suction cups 1 automatically draw air, creating a negative pressure between the suction cup 1 and the damaged foundation 13, pressing the crossbars 2 tightly against the fixed frame 7, thereby automatically pressing the entire electrolytic cell mechanism onto the damaged foundation 13 without the need for waterproof adhesive.

[0056] To ensure the stability of the connection between the crossbar 2 and the fixed frame 7, the present invention also includes a fixing frame 7 clamping mechanism. This clamping mechanism includes a self-tightening bolt 6, which is threaded onto the middle of the crossbar 2. A connecting rib is provided on the fixed frame 7 at a position corresponding to the crossbar 2. The rear end of the self-tightening bolt 6 abuts against the connecting rib of the fixed frame 7. By tightening the self-tightening bolt 6, the fixed frame 7 is further pressed tightly against the damaged foundation 13, ensuring reliable sealing.

[0057] The electrolytic cell mechanism of this invention is made of flexible materials, allowing for deformation and making it suitable for uneven, curved, or irregularly shaped damaged foundations 13. The sealing ring 9 has a thickness of 1-3 cm and is made of silicone, fluoropolymer, or EPDM rubber, with a closed ring cross-section, forming a sealed fit with the waterproof membrane 8 and the damaged foundation 13. The waterproof membrane 8 is a flexible polymer membrane, including but not limited to nylon, PVC, and PE; the flexible anode 15 is made of flexible carbon-based or metal-based materials, including but not limited to carbon fiber mesh, stainless steel mesh, aluminum foil, and zinc foil; the fixing frame 7 is made of plastic, possessing both rigidity and flexibility, and has deformability, including but not limited to PVC and nylon.

[0058] like Figure 6As shown, a deformation force test was performed on a PVC fixed frame 7 with a thickness of 20mm. Specifically, two blocks with a spacing (span L) of 600mm were placed on a table, and the fixed frame 7 was placed across the blocks. Loads of mass m of 3kg, 6kg, and 9kg were applied to the middle part of the fixed frame 7, respectively. The corresponding mid-span deflections δ were 4mm, 9mm, and 12mm, respectively. The acceleration due to gravity was taken as g≈9.8m / s². 2 The load forces are 29.4N, 58.8N, and 88.2N, respectively. The stiffness expressed in terms of force required per unit deflection is 7.35N / mm, 6.35N / mm, and 7.35N / mm, respectively. Therefore, its stiffness is approximately between 6.5 and 7.4N / mm.

[0059] The sealing ring 9 of the electrolytic cell mechanism has expandable wire lead-out pipes 4 and electrolyte injection and discharge pipes 5 at both ends. When the crack is long, multiple electrodeposition repair flexible electrolytic cells 12 can be used in series. Each electrodeposition repair flexible electrolytic cell 12 can be connected in series by connecting soft wires and flexible hoses 14.

[0060] The electrolytic cell mechanism uses a fixed frame 7 to press the waterproof membrane 8 tightly against the damaged foundation 13. The width and length of the waterproof membrane 8 and the flexible anode 15 can be flexibly cut according to the length and width of the cracks on site. The adsorption structure can also be flexibly selected according to the length or width of the electrolytic cell, choosing the number of automatic suction cups 1 or the length of the crossbar 2 to suit different working conditions.

[0061] The electrolytic cell mechanism relies entirely on the automatic suction cup 1 to press against the damaged foundation 13, without the need for bolt connections, and causes no damage to the wall.

[0062] The electrodeposition repair flexible electrolytic cell 12 of the present invention is lightweight and small in size. Taking the electrolytic cell mechanism with a length of 1 meter and a width of 0.1 meters as an example, the electrolytic cell mechanism weighs only 0.6-0.7 kg. Including the two sets of automatic suction cups 1 and crossbars 2 and other fixing structures, the total weight of the electrodeposition repair flexible electrolytic cell 12 is 1.1-1.2 kg.

[0063] An electrodeposition repair method for long-length cracks with high permeability in foundations is innovative in that it is based on a flexible electrolytic cell 12 and includes the following steps:

[0064] Step 1: Clean the surface of the damaged foundation 13 and crack 11, removing loose dust and layers, and mark the location of crack 11, such as... Figure 4 As shown, in this embodiment, the length of the crack is 2000mm, so three flexible electrolytic cells 12 with a length of 600mm are selected for electrodeposition repair.

[0065] Step 2: Adsorb each electrodeposition repair flexible electrolytic cell 12 onto the damaged foundation 13 along the direction of the crack 11;

[0066] Step 2.1: Align the sealing ring 9 with the concrete crack 11 and attach it to the damaged foundation 13. The sealing ring 9 is bent and adjusted according to the crack direction of the crack 11.

[0067] Step 2.2: Cover the outside of the sealing ring 9 with the waterproof membrane 8 with the flexible anode 15 attached, and then press the fixing frame 7 firmly onto the waterproof membrane 8;

[0068] Step 2.3: Start the automatic vacuum suction cup 1 to vacuum, so that the electrolytic cell mechanism is adsorbed onto the damaged foundation 13 by negative pressure;

[0069] Step 2.4: Tighten the self-tightening bolts 6 to further press the fixing frame 7 against the damaged foundation 13;

[0070] Step 3: A waterproof membrane 8 is pasted along the crack direction on the crack 11 that is not covered by the electrodeposition repair flexible electrolytic cell 12. The two ends of the waterproof membrane 8 are respectively pressed under the fixing frame 7 of the upper and lower electrodeposition repair flexible electrolytic cells 12. The setting of the waterproof membrane 8 can effectively prevent the electrolyte from leaking out of the crack.

[0071] Step 4: Connect the lead wires 3 of each adjacent electrodeposition repair flexible electrolytic cell 12, and connect the adjacent electrolyte injection and drainage pipes 5 through hoses 14. The uppermost electrolyte injection and drainage pipe 5 is connected to the high-concentration electrolyte tank through a replenishment pump, the middle electrolyte injection and drainage pipe 5 is connected to the concentration sensor 21 through a three-way pipe, and the lowermost electrolyte injection and drainage pipe 5 is connected to the drainage solenoid valve.

[0072] Step 5: Fill the sealed cavity with 0.5 mol / L ZnSO4 electrolyte through the electrolyte injection pipe 5 located at the top. At this time, the weight of each electrolytic cell is 1 kg, and the total mass of the three electrolytic cells used together is 3.2 kg.

[0073] Step 6: The concentration sensor 21 monitors the concentration of the electrolyte in the electrodeposition repair flexible electrolytic cell 12 in real time. When the concentration is detected to be lower than the preset threshold, the replenishment pump and the drain solenoid valve are started at the same time to complete the discharge of low-concentration electrolyte and the replenishment of high-concentration electrolyte.

[0074] Step 7: Using the flexible anode 15 on the waterproof membrane 8 as the anode and the internal steel reinforcement of the damaged foundation 13 as the cathode, apply a 5mA DC current for electrodeposition repair. The repair time is 7 days.

[0075] As the repair time increases, the deposits in the area covered by the flexible electrolytic cell 12, repaired by electrodeposition, will continuously increase and spread, gradually completing the repair of cracks 11 in the area covered by the flexible electrolytic cell 12 and the repair of cracks 11 between the two flexible electrolytic cells 12. Figure 7As shown, the sediment 16 in the upper electrolytic cell repair area and the sediment 18 in the lower electrolytic cell repair area gradually spread to the crack 17 that is not covered by the electrolytic cell, thus completing the repair work.

[0076] Throughout the repair process, the electrodeposition repair flexible electrolytic cell 12 remained stably adsorbed onto the damaged foundation 13. After the repair was completed, the electrolyte was drained, the self-tightening bolts 6 were loosened, and the negative pressure of the automatic suction cup 1 was released, thus completing the disassembly of the electrodeposition repair flexible electrolytic cell 12.

[0077] Compared with existing patented technologies (CN110541576A, CN210164281U), this invention has significant advantages in installation efficiency, structural performance, repair effect, wall protection, and reusability, as detailed below:

[0078] Compared with existing patented technology (CN110541576A) traditional storage box type electrolytic cell

[0079]

[0080] Compared with the existing patented technology (CN210164281U) rigid steel box device

[0081]

[0082] Repair effect test:

[0083] The device was used to repair a water-seeping wall in a basement. Crack 11 was 1.2m long and 0.15-0.2mm wide, with a seepage rate of 220ml / h before repair. The repair effect was characterized using an ultrasonic velocimeter. Figures 8-9 As shown, five sets of test points are arranged longitudinally along crack 11, with a 15cm interval between sets. The distance between the transmitter 19 and receiver 20 in each set is 30cm.

[0084] like Figure 10 As shown, the horizontal axis (X-axis) represents 5 test points on the crack (numbered 1-5, representing different locations of crack 11), the left vertical axis (Y-axis, unit km / s) represents the ultrasonic wave velocity, reflecting the density of the concrete (the higher the wave velocity, the denser the concrete), and the right vertical axis (Y-axis, unit %) represents the rate of increase in wave velocity before and after repair.

[0085] Orange column (wave velocity before repair): The ultrasonic wave velocity of the original concrete in crack 11 ranges from 2.6 to 3.1 km / s, which is significantly lower than the standard range for undamaged concrete (3.9 to 4.5 km / s), indicating that the concrete in crack 11 is loose and defective.

[0086] Green column (wave velocity after repair): The ultrasonic wave velocity after repair using the electrolytic cell of this invention ranges from 3.8 to 4.2 km / s, all reaching or approaching the wave velocity level of undamaged concrete, proving that crack 11 has been effectively filled by sediment and the density of concrete has been significantly improved.

[0087] Broken line (wave velocity increase rate): The wave velocity increase rate at each test point, with a data range of 32.4%-50.7%, and an average increase of more than 30-50%, which quantitatively reflects the uniformity and efficiency of the repair effect.

[0088] Depend on Figure 10 It can be seen that after using the electrodeposition repair of the present invention, the concrete density in the crack 11 area was restored to the level of undamaged concrete, and the repair effect was uniform and reliable throughout the entire length of crack 11, fully meeting the engineering repair requirements.

[0089] Depend on Figure 11 It can be seen that after using the electrodeposition repair of the present invention, the water seepage rate of the long crack 11 was reduced from 220 mL / h before repair to 2 mL / h, with almost no leakage, thus achieving the repair purpose.

[0090] Although embodiments and drawings of the present invention have been disclosed for illustrative purposes, those skilled in the art will understand that various substitutions, variations and modifications are possible without departing from the spirit and scope of the present invention and the appended claims. Therefore, the scope of the present invention is not limited to the contents disclosed in the embodiments and drawings.

Claims

1. A flexible electrolytic cell for electrodeposition repair of long-length cracks in foundations with high permeability, characterized in that: It includes an electrolytic cell mechanism, an automatic adsorption mechanism and an automatic electrolyte replenishment mechanism, wherein the automatic adsorption mechanism is used to automatically adsorb the electrolytic cell mechanism onto the damaged foundation (13); The electrolytic cell mechanism includes a fixed frame (7), a waterproof membrane (8), a flexible anode (15), a sealing ring (9), a wire lead-out pipe (4), and an electrolyte injection pipe (5). A sealing ring (9) is provided at the crack (11) of the damaged foundation (13) to be repaired. Wire lead-out pipes (4) and electrolyte injection pipes (5) are provided at both the upper and lower ends of the sealing ring (9). A rubber cap (10) is installed at the end of the electrolyte injection pipe (5). A waterproof membrane (8) is covered on the outside of the sealing ring (9). The space between the waterproof membrane (8) and the sealing ring (9) forms a sealed cavity for containing the electrolyte. A flexible anode (15) is provided in the sealed cavity. The lead wire (3) of the flexible anode (15) is led out by the wire lead-out pipe (4). A fixed frame (7) is pressed onto the outside of the waterproof membrane (8). The automatic adsorption mechanism includes a crossbar (2) and an automatic suction cup (1). A horizontally arranged crossbar (2) is pressed onto the front end face of the fixed frame (7). Automatic suction cups (1) are installed at the left and right ends of the crossbar (2). The automatic suction cups (1) are used to press the electrolytic cell mechanism onto the damaged foundation (13). The automatic electrolyte replenishment mechanism includes a replenishment pump, a concentration sensor (21), and a controller. The electrolyte injection pipe (5) at the upper end of the sealing ring (9) is connected to a high-concentration electrolyte tank via the replenishment pump. The electrolyte injection pipe (5) at the lower end of the sealing ring (9) is connected to a concentration sensor (21) via a three-way pipe. The concentration sensor (21) monitors the electrolyte concentration in the sealed cavity in real time. When the concentration is lower than the set threshold, the controller drives the replenishment pump to automatically replenish the high-concentration electrolyte to maintain the continuous and efficient progress of the electrodeposition reaction.

2. The flexible electrolytic cell for electrodeposition repair of long-length cracks in foundations with high permeability according to claim 1, characterized in that: The automatic adsorption mechanism consists of two sets arranged on the front end face of the fixed frame (7).

3. The flexible electrolytic cell for electrodeposition repair of long-length cracks in foundations with high permeability according to claim 1, characterized in that: It also includes a fixing frame (7) clamping mechanism, which includes a self-tightening bolt (6). The self-tightening bolt (6) is threaded in the middle of the crossbar (2). A connecting rib is provided on the fixing frame (7) at a position corresponding to the crossbar (2). The rear end of the self-tightening bolt (6) is abutted on the connecting rib of the fixing frame (7).

4. The flexible electrolytic cell for electrodeposition repair of long-length cracks in foundations with high permeability according to claim 1, characterized in that: The flexible anode (15) is fixed on the waterproof membrane (8).

5. The flexible electrolytic cell for electrodeposition repair of long-length cracks in foundations with high permeability according to claim 1, characterized in that: The sealing ring (9) is 1-3cm thick and is made of silicone, fluoropolymer or EPDM rubber. Its cross-section is a closed ring and it forms a sealed fit with the waterproof membrane (8) and the damaged foundation (13).

6. The flexible electrolytic cell for electrodeposition repair of long-length cracks in foundations with high permeability according to claim 1, characterized in that: The waterproof membrane (8) is a flexible polymer membrane, including nylon, PVC, and PE; the flexible anode (15) is a flexible carbon-based or metal-based material, including carbon fiber mesh, stainless steel mesh, aluminum foil, and zinc foil; the fixing frame (7) is made of plastic, including PVC and nylon.

7. A method for electrodeposition repair of long-length cracks with high permeability in foundations, characterized in that: This repair method is based on the electrodeposition repair of a flexible electrolytic cell as described in any one of claims 1-6, and includes the following steps: Step 1: Select the appropriate number of electrodeposition repair flexible electrolytic cells (12) according to the length of the crack (11) on the damaged foundation (13) to be repaired. Step 2: Adsorb each electrodeposition repair flexible electrolytic cell (12) onto the damaged foundation (13) along the direction of the crack (11); Step 3: A waterproof membrane (8) is pasted along the crack direction on the crack (11) that is not covered by the electrodeposition repair flexible electrolytic cell (12). The two ends of the waterproof membrane (8) are respectively pressed under the fixing frame (7) of the upper and lower electrodeposition repair flexible electrolytic cells. Step 4: Connect the lead wires (3) of each adjacent electrodeposition repair flexible electrolytic cell (12) and connect the adjacent electrolyte injection and drainage pipes (5) through hoses (14). The electrolyte injection and drainage pipe (5) at the first end is connected to the high-concentration electrolyte tank through a replenishment pump. The electrolyte injection and drainage pipe (5) in the middle is connected to the concentration sensor (21) through hoses (14). The electrolyte injection and drainage pipe (5) at the tail end is connected to the drain solenoid valve. Step 5: Inject electrolyte into the sealed cavity through the electrolyte injection pipe (5) located at the first end; Step 6: The concentration sensor (21) monitors the concentration of the electrolyte in the electrodeposition repair flexible electrolytic cell (12) in real time. When the concentration is detected to be lower than the preset threshold, the replenishment pump and the drain solenoid valve are started at the same time to complete the discharge of low-concentration electrolyte and the replenishment of high-concentration electrolyte. Step 7: Using the flexible anode (15) on the waterproof membrane (8) as the anode and the steel reinforcement inside the damaged foundation as the cathode, apply DC voltage for electrodeposition repair.

8. The electrodeposition repair method for long-length cracks with high permeability in foundations according to claim 7, characterized in that: The method for adsorbing each electrodeposition repair flexible electrolytic cell (12) onto the damaged foundation (13) along the direction of the crack (11) is as follows: Step 2.1: Align the sealing ring (9) with the concrete crack (11) and attach it to the damaged foundation (13); Step 2.2: Cover the outside of the sealing ring (9) with the waterproof membrane (8) with the flexible anode (15) attached, and then press the fixing frame (7) onto the waterproof membrane (8); Step 2.3: Press the crossbar (2) with the automatic suction cup (1) onto the fixed frame (7), start the automatic suction cup (1) to extract air, so that the electrolytic cell mechanism is adsorbed onto the damaged foundation (13) by negative pressure; Step 2.4: Tighten the self-tightening bolt (6) to further press the fixing frame (7) against the surface of the damaged foundation (13).

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