A method for repairing cracks in a concrete structural wall panel

Abstract

The application relates to a concrete structure wallboard crack repairing construction method, which comprises the following steps: finding a water leakage point position along a concrete structure crack; filling a sealing medium along a sealing groove of the crack; alternately drilling holes along two sides of the crack to form grouting holes, wherein the grouting holes are all obliquely intersected with the crack; installing a water stop needle head; connecting a grouting equipment with the water stop needle head, allowing repairing slurry to diffuse from the grouting holes to the periphery of the intersected crack; repeatedly supplementing grouting until the grouting pressure change is in a gentle interval and the grouting is stopped; removing the water stop needle head and plugging and smoothing the needle hole after the repairing slurry is solidified; pasting an anti-permeation film waterproof coiled material on the wallboard and covering the position where the crack is located, coating a polymer cement slurry on the surface of the anti-permeation film waterproof coiled material, and smoothing. The repairing slurry is injected and diffused to the periphery of the crack through the intersected grouting holes, so that deep filling and repairing of the crack are realized, and water leakage after the crack is enlarged is effectively blocked.

Description

Technical Field

[0001] This invention relates to the field of construction measures for existing buildings, and in particular to a construction method for repairing cracks in concrete structural wall panels. Background Technology

[0002] Concrete structural slabs, shear walls, and base slabs are wall components in building construction. Due to the inherent properties of concrete, cast-in-place concrete structures will develop cracks of varying degrees and forms during construction and use.

[0003] Concrete crack formation is caused by one or more of the following factors: substandard raw material quality, unreasonable mix design, uneven on-site mixing; inadequate vibration during pouring, or localized missed vibration; premature formwork removal or premature application of external loads; concentrated release of cement hydration heat, lack of water curing measures, or inadequate curing leading to drying shrinkage and compression deformation; uneven settlement of the foundation, or structural deformation caused by foundation stress imbalance; stress concentration at component joints; and long-term exposure to external conditions such as temperature and humidity, and service loads.

[0004] In related technologies, epoxy grout and cement slurry are injected into the cracks of concrete structures using high-pressure equipment to fill the gaps and bond the cracked sections. Waterproof membranes are then used to cover and conceal the cracks.

[0005] However, existing methods for treating cracks in wall panels focus on sealing or physically filling the surface of the cracks, failing to fill the cracks in the dense internal structure. Under long-term load and environmental conditions, the surface sealing layer is prone to detachment, and the internal grout is prone to cracking. These technical problems prevent the crack repair from ensuring long-term effectiveness. Furthermore, under long-term load and environmental conditions, the bonding stability between the waterproof membrane and the concrete wall panel is poor, and local deformation and delamination are likely to occur after long-term use, causing damage to the waterproof system and recurring water seepage at the crack locations. Therefore, improvements are needed. Summary of the Invention

[0006] To overcome the problems existing in related technologies, this invention provides a construction method for repairing cracks in concrete structural wall panels, which solves the technical problems of difficult long-term repair of wall panel cracks and easy failure of rolled materials.

[0007] According to a first aspect of the present invention, a method for repairing cracks in a concrete structural wall panel is provided, the method comprising: Locate the leak by tracing the cracks in the concrete structure. A sealing groove is cut along the crack in the wall panel, and after the sealing groove is cleaned of dust, it is filled with a sealing medium. Grouting holes are formed by alternately drilling holes on both sides of the crack. The grouting holes are then cleaned of dust. All the grouting holes intersect the crack at an angle. Water-stop needles are installed in multiple grouting holes on both sides of the crack. Grouting holes without water-stop needles are used as observation holes and pressure relief holes. Connect the grouting equipment to the water-stop needle and inject the repair grout. The repair grout diffuses from the grouting hole to the periphery of the intersecting crack. After the grout starts to come out of the adjacent grouting hole or the observation hole on the surface of the crack, maintain the grouting pressure for a preset time, and then add grout according to the grout coming out of the observation crack. Repeat the grouting process until the grouting pressure change is in a flat range and then stop grouting. After the repair grout has cured, remove the water-stop needle and seal the needle hole smoothly; Apply the waterproof membrane to the wall panel and cover the cracks. Apply polymer cement slurry to the surface of the waterproof membrane and smooth it out.

[0008] In one embodiment, the alternating drilling along both sides of the crack to form grouting holes includes: The drilling positions are determined at preset intervals along the extension direction of the crack; The minimum drilling depth of the grouting hole is greater than or equal to 1 / 2 of the wall panel thickness, and the drilling angle is less than or equal to 45 degrees.

[0009] In one embodiment, the ratio of the grouting hole depth to the wall panel thickness is B, where 1 / 2 ≤ B ≤ 2 / 3.

[0010] In one embodiment, multiple drilling zones are divided along the length of the crack, and multiple drilling positions are set in each drilling zone. A first side drilling position and a second side drilling position are set in each drilling zone, and the depth of the first side drilling position is less than the depth of the second side drilling position.

[0011] In one embodiment, the first side punching position and the second side punching position are interchanged within one or more punching areas.

[0012] In one embodiment, the sealing groove is a triangular V-groove with a groove width of 10 mm and a groove depth of 10 mm; The sealing medium is epoxy putty, the top surface of which is flush with the opening of the sealing groove, and the repair grout is polyurea grout.

[0013] In one embodiment, the alternating drilling along both sides of the crack to form grouting holes includes: Insert the air compressor's blowing pipe along the grouting hole and close to the bottom of the grouting hole; the size of the blowing pipe is smaller than the size of the grouting hole. An airflow with a preset pressure is blown into the grouting hole to remove dust from the grouting hole and cracks. After moving the air blowing pipe back and forth along the depth direction of the grouting hole a certain number of times, pull it out.

[0014] In one embodiment, the step of attaching the waterproof membrane to the wall panel and covering the location of the crack includes: Clean the wall panel surface around the crack to the predetermined width; Apply an acrylic copolymer emulsion mixed with cement paste to the dry surface for interface treatment; Then, use acrylic emulsion paste to adhere the reinforced polymer antipermeable membrane; The reinforced polymer antipermeable membrane is scraped and compacted using a scraper.

[0015] In one embodiment, the acrylic emulsion paste is prepared by mixing acrylic copolymer emulsion in a 1:1.5 cement mixture until it reaches a gel-like consistency.

[0016] In one embodiment, the elongation of the polymeric antipermeable membrane is greater than or equal to 100%.

[0017] The technical solutions provided by the embodiments of the present invention can include the following beneficial effects: Sealing grooves are opened at the cracks in the wall panel, and initial sealing is achieved through a sealing medium. The sealing grooves increase the sealing area and improve the sealing effect. Repair grout is injected and diffused to the periphery of the crack through intersecting grouting holes, thereby achieving deep filling and repair of the crack. This not only effectively prevents water leakage from the crack, but also improves the aging resistance, deformation resistance, settlement resistance, thermal expansion and contraction resistance, and seepage resistance after the repair grout has cured. The waterproof membrane smoothly covers the cracks, has excellent elongation, and ensures that the constructed area will not leak. The surface of the waterproof membrane is coated with polymer cement slurry, and painting or tiling the surface does not affect the adhesion strength, resulting in good repair effects. Attached Figure Description

[0018] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0019] Figure 1 This is a flowchart illustrating a construction method according to an embodiment.

[0020] Figure 2 This is a schematic diagram illustrating a crack in a wall panel according to one embodiment.

[0021] Figure 3 This is a schematic diagram illustrating the filling of a sealing medium and the grouting of a water-stopping needle according to one embodiment.

[0022] Figure 4 This is a schematic diagram illustrating an application to a wall panel according to one embodiment.

[0023] In the diagram, wall panel 10; crack 11; sealing groove 12; grouting hole 20; first side drilling position 21; second side drilling position 22; water-stop needle 30; sealing medium 40; waterproof membrane 50. Detailed Implementation

[0024] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual images, and should not be construed as limiting the invention. It is understandable that some well-known structures and their descriptions may be omitted in the drawings for those skilled in the art.

[0025] like Figures 1 to 4 As shown, the present invention provides a construction method for repairing cracks in a concrete structural wall panel, the construction method being used to repair cracks 11 in the wall panel 10.

[0026] The construction method includes the following steps: Step S101: Locate the leak point along the crack 11 in the concrete structure. The leak point is where part of the crack 11 penetrates the concrete wall structure. Optionally, the leak point can be located by visual inspection or by testing instruments to improve the flexibility of detection. Preferably, the leak point is manually checked along the crack 11 of the concrete wall panel 10, marking all seepage and leakage points, identifying the core leakage area of ​​the crack 11, and distinguishing between through cracks 11 and surface micro-cracks 11, providing a basis for differentiated construction.

[0027] In step S102, a sealing groove 12 is cut along the crack 11 on the wall panel 10, and after dust removal, the sealing groove 12 is filled with sealing medium 40. The sealing groove 12 is set along the crack 11, which can enlarge the opening on one side of the crack 11. The sealing groove 12 can accommodate the sealing medium 40, achieving preliminary sealing of the surface of the crack 11. Preferably, the cut sealing groove 12 is thoroughly cleaned to remove dust, debris and impurities, and then the sealing medium 40 is filled into the sealing groove 12 and leveled.

[0028] In one optional embodiment, the sealing groove 12 is a triangular V-shaped groove with a groove width of 10 mm and a groove depth of 10 mm. The sealing groove 12 extends along the trajectory of the crack 11 and is cut on the surface of the wall panel 10 using a cutting machine. Optionally, the sealing groove 12 is a triangular V-shaped groove, with the crack 11 located at or near the bottom of the sealing groove 12. For example, the groove width of the sealing groove 12 is 10 mm; the groove depth of the sealing groove 12 is 10 mm.

[0029] After the sealing groove 12 is cut, it can be rinsed with clean water or cleaned with a brush and a high-pressure air gun to remove all dust and debris in the groove, so as to keep the sealing groove 12 clean and free of debris, thereby improving the bonding effect between the sealing groove 12 and the sealing medium 40.

[0030] Preferably, the sealing medium 40 is epoxy putty, with the top surface of the epoxy putty flush with the opening of the sealing groove 12. The epoxy putty is prepared and filled into the sealing groove 12, compacted and smoothed during the filling process to ensure the top surface of the epoxy putty is completely flush with the opening of the groove, achieving initial sealing of the surface of the crack 11 and preventing grout from overflowing from the surface during subsequent grouting. A sealing groove 12 is opened on the wall panel 10 corresponding to the crack 11, and initial sealing is achieved through the sealing medium 40. The sealing groove 12 increases the sealing area and improves the sealing effect.

[0031] In step S103, grouting holes 20 are formed by alternately drilling along both sides of the crack 11, and the grouting holes 20 are cleaned of dust. All grouting holes 20 intersect the crack 11 at an angle. The grouting holes 20 are set at an angle and intersect the crack 11 at an angle so that the grouting holes 20 intersect the crack surface of the crack 11. The grouting holes 20 intersect at an angle from opposite sides of the crack 11 to avoid the disadvantage of uneven grouting in one direction.

[0032] In step S104, water-stop needles 30 are installed along the multiple grouting holes 20 on both sides of the crack 11. Grouting holes 20 without water-stop needles 30 serve as observation holes and pressure relief holes. The water-stop needles 30 control the opening and closing of the grouting holes 20. Each water-stop needle 30 is equipped with a one-way valve mechanism to prevent grout from flowing out of the grouting holes 20. Preferably, the water-stop needles 30 are expanded to the grouting holes 20 to achieve a tight fit and withstand the impact of grouting pressure. The remaining grouting holes 20 without water-stop needles 30 serve as observation holes and pressure relief holes, effectively releasing the internal air pressure of the crack 11 and simultaneously monitoring the grouting filling status in real time. The water-stop needles 30 are used in waterproofing projects and are existing technology; their application can be understood by referring to existing structures, and will not be elaborated further here.

[0033] Step S105: Connect the grouting equipment to the water-stop needle 30 and inject repair grout. The repair grout diffuses from the grouting hole 20 to the periphery of the intersecting crack 11. After the grout starts to come out of the adjacent grouting hole 20 or the observation hole on the surface of the crack 11, maintain the grouting pressure for a preset time, and then supplement the grouting according to the grouting situation in the observation crack. Repeat the grouting multiple times until the grouting pressure change is in a flat range and then stop the grouting.

[0034] Connect the pipes of the grouting equipment to the water-stop needles 30 one by one. The grouting equipment injects repair grout into the crack 11 through the water-stop needles 30, allowing the repair grout to diffuse and penetrate along the grouting holes 20 into the periphery and internal micro-cavities of the intersecting crack 11. When a uniform grout discharge is observed in adjacent grouting holes 20 or observation holes on the surface of the crack 11, maintain the preset grouting pressure for a certain period of time. Preferably, the grouting equipment injects repair grout through the water-stop needles 30, and the pressure applied to the repair grout by the grouting equipment is 0.2 MPa-1.5 MPa.

[0035] Next, based on the saturation of grout discharge from the observation holes and the surface of crack 11, supplementary grouting is performed. Once grout begins to discharge from adjacent holes or observation holes on the surface of crack 11, the grouting pressure is maintained for 10-30 seconds, and the grout discharge from crack 11 is continuously observed. Supplementary grouting is then performed as needed, specifically, until some grout overflows from the observation holes and crack 11 and does not flow back into crack 11 within a preset time. This supplementary grouting operation is repeated multiple times until the grouting pressure stabilizes and the pressure change is within a gradual range. Once the crack 11 is deemed fully filled, grouting operations in the corresponding area are stopped. Preferably, the grouting equipment can perform two or three grouting operations.

[0036] Specifically, the grouting equipment gradually injects grout from bottom to top or from one side to the other. When grout begins to emerge from the observation holes on the surface of adjacent holes or cracks 11, the pressure is maintained for 10s to 30s, and the grout emergence in the crack is observed.

[0037] As a preferred option, polyurea grout is used for repair. Polyurea grout is a two-component or one-component reactive polymer elastomer material that rapidly solidifies into a dense elastomer through a chemical reaction. It is then injected under high pressure into the leaking areas of the concrete structure crack 11 to effectively seal the crack 11.

[0038] The repair grout is injected through intersecting grouting holes 20 and diffuses to the periphery of crack 11, thereby achieving deep filling and repair of crack 11. This not only effectively prevents water leakage from crack 11, but also improves the aging resistance, deformation resistance, settlement resistance, thermal expansion and contraction resistance, and leakage resistance after the repair grout has cured. The construction method of multiple injections combined with pressure-stabilized grouting allows for dynamic adjustment of the grouting operation according to the actual grout output, ensuring that the grout inside crack 11 is fully filled and the pressure is uniform. After curing, the repaired structure has strong integrity and can adapt to building loads and temperature and humidity changes over a long period of time, significantly extending the service life of the repaired crack 11 in the concrete wall panel 10.

[0039] Step S106: After the repair grout has cured, remove the water-stop needle 30 and seal the pinholes smoothly. In this step, after the injected repair grout has completely cured and reached the design strength, remove the water-stop needle 30 from the surface of the wall panel 10, seal the pinholes left by the needles, and grind them smooth to ensure the flatness of the wall panel 10 surface. Preferably, epoxy putty is used to seal the pinholes to improve the sealing effect.

[0040] Optionally, once the polyurea grout has completely cured, the exposed water-stop needle 30 can be removed, the water-stop needle 30 can be chiseled off, and any overflowing cured grout can be cleaned up. The needle hole can then be filled and smoothed with epoxy putty. Preferably, the polyurea grout has an elastic elongation of 300%-500% to create an elastic expansion and contraction effect, which can maintain a seal during crack movement and maintain an elastic connection seal when the crack 11 is displaced.

[0041] Step S107: Attach the waterproof membrane 50 to the wall panel 10 and cover the location of the crack 11. Apply polymer cement slurry to the surface of the waterproof membrane 50 and smooth it. Optionally, the width of the waterproof membrane 50 may vary from 200mm to 500mm.

[0042] like Figures 3 to 4 As shown, the waterproof membrane 50 is laid on the surface of the wall panel 10, completely covering the crack 11 and the surrounding area. Then, a polymer cement slurry is evenly coated onto the surface of the waterproof membrane 50 and smoothed with a scraper to form an integrated waterproof protection system. Preferably, after grouting, the surface needs to dry, and after several days of drying, the waterproof membrane 50 is covered at the crack 11, extending towards both sides of the crack 11. Preferably, the width of the waterproof membrane 50 is 20 to 50 times the width of the groove 12, for example, the width of the waterproof membrane 50 is 20 cm to 50 cm.

[0043] The 50mm anti-seepage waterproof membrane smoothly covers cracks (11mm), exhibiting excellent elongation and preventing further water leakage at the constructed areas. The surface of the 50mm anti-seepage waterproof membrane is coated with polymer cement slurry; plastering or tiling on the surface does not affect the adhesion, resulting in excellent repair performance.

[0044] In one embodiment, step S103 involves alternately drilling holes along both sides of the crack 11 to form grouting holes 20, including the following steps: The drilling positions are determined by a preset length interval along the extension direction of the crack 11; the grouting holes 20 are spaced apart on both sides of the crack 11 along the extension direction of the crack 11, so that the grouting can be drilled into the crack 11 from the surface of the wall panel 10 on both sides of the crack 11. Multiple grouting holes 20 can be alternately distributed along both sides of the crack 11. Correspondingly, the alternating arrangement of the grouting holes 20 can realize that the repair grout can be alternately injected from both sides of the crack 11, resulting in a good grouting effect.

[0045] The minimum drilling depth of the grouting hole 20 is greater than or equal to half the thickness of the wall panel 10, and the drilling angle is less than or equal to 45 degrees. The inclination angle of the drilling hole 20 relative to the vertical plane of the wall panel 10 is less than or equal to 45 degrees; for example, the drilling angle of the grouting hole 20 can be 30 degrees, 35 degrees, 40 degrees, 42 degrees, 45 degrees, etc. When the drilling angle of the grouting hole 20 is 45 degrees, the drilling position and drilling depth of the grouting hole 20 are the same to facilitate control of the drilling depth. When the drilling angle of the grouting hole 20 is 30 degrees, the drilling position and drilling depth of the grouting hole 20 are half of the drilling depth to facilitate control of the drilling depth.

[0046] Preferably, the drilling depth of the grouting hole 20 is less than the thickness of the wall panel 10, and the grouting hole 20 passes through the crack 11 to form an intersecting structure. Preferably, the distance between the drilling position of the grouting hole 20 and the crack 11 should be less than or equal to half the thickness of the wall panel 10.

[0047] Furthermore, the ratio of the depth of the grouting hole 20 to the thickness of the wall panel 10 is B, where 1 / 2 ≤ B ≤ 2 / 3. The depth of the grouting hole 20 needs to be set according to the thickness of the wall panel 10. All grouting holes 20 intersect with the crack 11 to ensure that the repair grout input through the grouting holes 20 fills the crack 11. Optionally, the drilling depth of the grouting hole 20 on one side of the crack 11 is greater than the drilling depth of the grouting hole 20 on the other side of the crack 11. This alternating arrangement can be achieved not only in the depth direction of the wall panel 10 but also in the left-right direction, thereby realizing a three-dimensional grouting structure and achieving a better effect in filling the crack 11 with the repair grout.

[0048] In one embodiment, multiple drilling zones are divided along the length of the crack 11. Within the same zone, the drilling patterns of the grouting holes 20 are identical. In adjacent drilling zones, the drilling patterns of the grouting holes 20 can be the same or opposite to form an alternating arrangement.

[0049] Multiple drilling positions are set within each drilling zone, and a first side drilling position 21 and a second side drilling position 22 are set within each drilling zone. The depth of the first side drilling position 21 is less than the depth of the second side drilling position 22. The crack 11 is filled in layers throughout by grouting holes 20 with alternating depths 21 and 22. For example, the drilling angle of the first side drilling position 21 is 45 degrees, and the drilling angle of the second side drilling position 22 is 30 degrees.

[0050] In one embodiment, the first side drilling position 21 and the second side drilling position 22 within one or more drilling zones are interchanged. By interchangeding the first and second side drilling positions 22, a layout of grouting holes 20 with alternating depths and left and right sides is formed, eliminating grouting blind spots.

[0051] The grouting holes 20 are arranged in an alternating pattern with adjustable spacing, drilling depth, and drilling angle to adapt to the structural characteristics of the concrete wall panel 10. This ensures that the repair grout fully penetrates into all areas of the crack 11 while avoiding excessive grouting of the holes 20, which could damage the structural strength of the wall panel 10.

[0052] In one embodiment, in step S103, the grouting hole 20 is subjected to dust removal operation to remove debris and dust inside the grouting hole 20, so as to improve the connection reliability of the repair grout.

[0053] like Figures 1 to 4 As shown, the dust removal operation includes the following steps: Insert the air compressor's blowing pipe along the grouting hole 20 and close to the bottom of the grouting hole 20. The size of the blowing pipe is smaller than the size of the grouting hole 20. Select an air compressor blowing pipe with a size smaller than the diameter of the grouting hole 20, insert the blowing pipe into the grouting hole 20 and extend it to a position close to the bottom of the grouting hole 20 so that the high-pressure gas can blow out the debris at the bottom of the grouting hole 20, thereby preventing the debris at the bottom of the grouting hole 20 from remaining stationary.

[0054] An airflow at a preset pressure is blown into the grouting hole 20 to remove dust from the grouting hole 20 and the crack 11. The air compressor outputs a preset pressure airflow to continuously blow into the grouting hole 20, thoroughly removing dust and debris from the inside of the grouting hole 20 and the gaps in the connected crack 11.

[0055] After moving the air blowing pipe back and forth along the depth direction of the grouting hole 20 a certain number of times, it is pulled out. During the dust blowing process, the air blowing pipe is moved back and forth along the depth direction of the grouting hole 20 a preset number of times and then slowly pulled out. During the movement of the air blowing pipe, the airflow dynamically impacts and forms a vibration impact effect, avoiding the adsorption and residue of debris, and ensuring that there are no dead corners in dust removal. For example, the air blowing pipe is moved back and forth along the depth direction of the grouting hole 20 3-5 times to thoroughly clean the dust and debris in the inner wall of the grouting hole 20 and the gaps in the connected cracks 11.

[0056] In one embodiment, the waterproof membrane 50 is adhered to the wall panel 10 and covers the location of the crack 11, including: Clean the surface of the wall panel 10 around the crack 11 within a preset width; clean the surface of the wall panel 10 within the preset width range around the crack 11 to remove floating dust, oil stains and loose debris from the surface of the wall panel 10 so that the surface of the wall panel 10 is a clean and dry surface.

[0057] Apply an acrylic copolymer emulsion mixed with cement paste to the dry surface as a base interface treatment; apply an acrylic copolymer emulsion mixed with cement paste as a base interface treatment agent to the dry wall panel 10 surface to improve the adhesion between the substrate and the roll material.

[0058] Next, use acrylic emulsion mortar to adhere the reinforced polymer waterproof membrane. Using acrylic emulsion mortar as the bonding medium, adhere the reinforced polymer waterproof membrane to ensure the membrane completely covers the crack area 11. Preferably, the acrylic emulsion mortar is mixed with acrylate copolymer emulsion at a ratio of 1:1.5 and stirred until it reaches a gel-like consistency. The acrylic emulsion mortar, made by mixing acrylate copolymer emulsion and cement at a ratio of 1:1.5 and stirring until it reaches a gel-like state, exhibits good bonding performance.

[0059] The reinforced polymer geomembrane is compacted using a scraper. Repeated scraping and pressing of the geomembrane with the scraper completely removes air from between the membrane and the wall panel 10, ensuring a tight and airtight bond between the geomembrane and the wall panel 10.

[0060] Preferably, the elongation rate of the polymer geomembrane is greater than or equal to 100%. The polymer geomembrane possesses good deformation adaptability, capable of accommodating slight deformations of the wall panel 10, thus preventing the membrane from cracking or even delaminating due to stretching. For example, the elongation rate of the polymer geomembrane can be 100%, 150%, 200%, 250%, 300%, or 400%. The greater the elongation rate of the polymer geomembrane, the more elastic it can maintain its expansion and contraction during the changes in the crack 11, thus preserving the sealing and waterproofing effect.

[0061] The surface of crack 11 is sealed by sealing groove 12. Combined with the inclined staggered grouting of the deep area of ​​crack 11 in wall panel 10 and the overall waterproof protection of the surface of wall panel 10 with high polymer anti-permeability membrane, the composite repair process can achieve all-round and blind-zone-free filling of the fine cavities inside crack 11 through the layout of deep and shallow grouting holes 20 intersecting with crack 11. This completely eliminates the hidden danger of crack 11 inside the structure, solves the problem of incomplete filling and easy secondary cracking in traditional repair methods, and greatly improves the long-term effectiveness of crack 11 repair.

[0062] Epoxy mortar is used for surface sealing, combined with deep grouting with polyurea grout. The synergistic effect of these two materials ensures both the tightness of the surface seal and the adhesion and impermeability of the deep cracks. Simultaneously, acrylic copolymer emulsion cement slurry is used for substrate treatment, and a high-elongation polymer impermeable membrane is bonded with specialized acrylic emulsion slurry, significantly improving the bonding stability between the waterproof membrane and the wall panel substrate, forming a comprehensive waterproof protection system.

[0063] It should be understood that this application is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. This application is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of this application and include common knowledge or customary techniques in the art that are not disclosed in this invention.

Claims

1. A method for repairing cracks in concrete structural wall panels, characterized in that, Construction methods include: Locate the leak by tracing the cracks in the concrete structure. A sealing groove is cut along the crack in the wall panel, and after the sealing groove is cleaned of dust, it is filled with a sealing medium. Grouting holes are formed by alternately drilling holes on both sides of the crack. The grouting holes are then cleaned of dust. All the grouting holes intersect the crack at an angle. Water-stop needles are installed in multiple grouting holes on both sides of the crack. Grouting holes without water-stop needles are used as observation holes and pressure relief holes. Connect the grouting equipment to the water-stop needle and inject the repair grout. The repair grout diffuses from the grouting hole to the periphery of the intersecting crack. After the grout starts to come out of the adjacent grouting hole or the observation hole on the surface of the crack, maintain the grouting pressure for a preset time, and then add grout according to the grout coming out of the observation crack. Repeat the grouting process until the grouting pressure change is in a flat range and then stop grouting. After the repair grout has cured, remove the water-stop needle and seal the needle hole smoothly; Apply the waterproof membrane to the wall panel and cover the cracks. Apply polymer cement slurry to the surface of the waterproof membrane and smooth it out.

2. The construction method according to claim 1, characterized in that, The method of alternately drilling holes along both sides of the crack to form grouting holes includes: The drilling positions are determined at preset intervals along the extension direction of the crack; The minimum drilling depth of the grouting hole is greater than or equal to 1 / 2 of the wall panel thickness, and the drilling angle is less than or equal to 45 degrees.

3. The construction method according to claim 2, characterized in that, The ratio of the grouting hole depth to the wall panel thickness is B, where 1 / 2 ≤ B ≤ 2 / 3.

4. The construction method according to claim 3, characterized in that, Multiple drilling zones are divided along the length of the crack. Multiple drilling positions are set in each drilling zone. A first side drilling position and a second side drilling position are set in each drilling zone. The depth of the first side drilling position is less than the depth of the second side drilling position.

5. The construction method according to claim 4, characterized in that, The positions of the first and second side punching positions within one or more punching areas are interchanged.

6. The construction method according to claim 1, characterized in that, The sealing groove is a triangular V-shaped groove with a groove width of 10 mm and a groove depth of 10 mm; The sealing medium is epoxy putty, the top surface of which is flush with the opening of the sealing groove, and the repair grout is polyurea grout.

7. The construction method according to claim 1, characterized in that, The method of alternately drilling holes along both sides of the crack to form grouting holes includes: Insert the air compressor's blowing pipe along the grouting hole and close to the bottom of the grouting hole; the size of the blowing pipe is smaller than the size of the grouting hole. An airflow with a preset pressure is blown into the grouting hole to remove dust from the grouting hole and cracks. After moving the air blowing pipe back and forth along the depth direction of the grouting hole a certain number of times, pull it out.

8. The construction method according to claim 1, characterized in that, The process of attaching the waterproof membrane to the wall panel and covering the cracks includes: Clean the wall panel surface around the crack to the predetermined width; Apply an acrylic copolymer emulsion mixed with cement paste to the dry surface for interface treatment; Then, use acrylic emulsion paste to adhere the reinforced polymer antipermeable membrane; The reinforced polymer antipermeable membrane is scraped and compacted using a scraper.

9. The construction method according to claim 8, characterized in that, The acrylic emulsion was mixed with acrylate copolymer emulsion at a ratio of 1:1.5 and cement until it reached a gel-like consistency.

10. The construction method according to claim 8, characterized in that, The elongation of the polymer antipermeable membrane is greater than or equal to 100%.

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