A method for repairing cracks in road and dam surfaces using magnetic mortar

Abstract

The present invention provides a method for repairing cracks in pavement and dam surfaces using magnetic mortar. The method involves drilling holes along pavement cracks or slots created by grooving or expanding the cracks, preparing magnetic mortar, and then placing a strong NdFeB magnet on a repair device adjacent to one side of the crack. This generates a magnetic field within the crack, restricting the flow of the magnetic mortar to the left and right. High-intensity grouting pressure then repairs the crack interior, improving the crack slurry filling rate and road integrity. This method is simple to operate, relatively short in time, and can significantly improve the asphalt concrete pavement's ability to resist vehicle loads and environmental factors, extending the pavement's service life and significantly reducing highway maintenance and repair costs.

Description

Technical Field

[0001] The invention relates to the technical field of road surface and dam surface repair, in particular to a method for repairing road surface and dam surface cracks by using magnetic mortar. Background Art

[0002] With the continuous improvement of the modernization level and scientific level of road construction in my country, the road crack repair technology has made further development. At present, the road crack repair technology has occupied an important position in the field of road construction engineering in my country.

[0003] Cracks are also one of the main diseases of concrete dams. Their existence will have a significant adverse impact on the safety of the dam structure, the dam's function and durability.

[0004] At present, the repair of road cracks is generally done by heating asphalt and then repairing it. This repair method cannot fully penetrate the cracks and fill them completely. At the same time, the bonding strength between the repaired asphalt and the material of the road structure layer is insufficient. Under the combined effects of vehicle load, external humidity and temperature, it is easy to cause separation and damage, which reduces the stress quality of the road. In the long run, the cracks need to be repaired repeatedly, causing damage to the road surface and affecting traffic, wasting manpower and material resources. Summary of the Invention

[0005] To address the above technical issues, the present invention provides a method for repairing cracks in pavement and dam surfaces using magnetic mortar. This method prevents water and impurities at the bottom and walls of the trough from affecting the bonding strength and structural strength of the filling material to the road structure. It also addresses issues such as asphalt slurry not being able to penetrate the cracks, and deep cracks lacking bonding material, resulting in insufficient bonding strength and crack detachment. This repair device is not only simple to operate and time-efficient, but also effectively addresses the problem of repairing deep cracks in pavement and dam surfaces.

[0006] In order to achieve the above technical features, the object of the present invention is achieved as follows: a method for repairing cracks in road surfaces and dam surfaces using magnetic mortar, which includes a GPR disease detector for detecting the specific location, direction, length and width data of cracks in the road surface or dam surface to be repaired;

[0007] Also included is a grouting machine for grouting the interior of the crack, wherein the grouting machine is connected to a grouting hole machined at the location of the crack through a grouting pipe;

[0008] The method comprises the following steps:

[0009] Step 1.1, Material Preparation: Prepare the materials and equipment required to fill the cracks, including GPS disease detector, raw materials for magnetic mortar, drilling equipment, NdFeB strong magnets, grouting nozzles, epoxy resin putty and crack repair cart;

[0010] Step 1.2, crack detection: Use GPS disease detection instrument to continuously detect along the disease location, and inversely analyze the structural layer thickness, crack length, crack width and crack depth parameters based on the detection results;

[0011] Step 1.3, slotting: slotting or expanding along the direction and shape of the crack to obtain a slot;

[0012] Step 1.4, cleaning the groove wall: remove impurities, debris and loose and broken concrete on the crack wall that affect the bonding effect to expose the solid wall surface;

[0013] Step 1.5, drilling grouting holes: Determine the location, depth, and diameter of the grouting holes based on the damage of the cracks and then drill them;

[0014] Step 1.6, Crack Cleaning: After drilling, use a small industrial vacuum cleaner to clean the cracks;

[0015] Step 1.7, burying the nozzle: bury the grouting nozzle in the drilled hole and tighten it with a special Allen wrench to ensure that there is no gap between the grouting nozzle and the drilled hole and no water leakage. The height of the grouting nozzle is higher than the road surface or dam surface, and epoxy resin putty is used to seal the cracks;

[0016] Step 1.8, prepare magnetic mortar: Add iron powder, asphalt, curing agent, and epoxy resin materials to ordinary mortar according to a certain ratio and stir thoroughly to make magnetic mortar. Test its performance to ensure its normal use during the filling stage;

[0017] Step 1.9, Positioning of NdFeB Magnets: According to the location of the cracks and grouting holes, adjust the position of the crack repair cart so that the NdFeB magnets are placed along the crack side. Then, use the lifting function of the equipment to make the bottom surface of the NdFeB magnets close to the road surface or dam surface. Then, activate the lifting spring device of the NdFeB magnets to make the NdFeB magnets vibrate up and down.

[0018] Step 1.10, Grouting: Place the magnetic mortar into the storage barrel and use a grouting machine to inject the magnetic mortar into the grouting holes through the grouting pipe and grouting nozzle. Due to the presence of strong NdFeB magnets on the crack plane, the crack has a strong magnetic field within a certain range, which allows the magnetic mortar to gather within the magnetic field. This prevents the magnetic mortar from spreading to both sides due to fluidity in the crack. Under the action of high-pressure grouting, the entire crack area can be filled more densely.

[0019] Step 1.11, remove the nozzle and seal it: After the grouting is completed, confirm that there is no leakage and then remove or knock off the exposed grouting nozzle. Use epoxy resin putty to seal the grouting nozzle. At the same time, apply waterproof material three times to the chemical grouting part for surface waterproofing according to the actual situation.

[0020] Step 1.12, quality acceptance: After the construction is completed, use a GPS defect detector or seismograph to conduct quality acceptance in accordance with quality requirements.

[0021] A method for repairing cracks on a road surface and a dam surface using magnetic mortar comprises the following steps:

[0022] Step 2.1, Material Preparation: Prepare the materials and equipment required to fill the cracks, including the Super GPS disease detector, raw materials for magnetic mortar, drilling equipment, NdFeB strong magnets, grouting nozzles, resistors, power supplies, coils, iron core grouting tubes, and crack repair carts;

[0023] Step 2.2, crack detection: Use GPS disease detection instrument to continuously detect along the disease location, and inversely analyze the structural layer thickness, crack length, crack width, and crack depth parameters based on the detection results;

[0024] Step 2.3, slotting: slotting or expanding along the direction and shape of the crack to obtain a slot;

[0025] Step 2.4, cleaning the groove wall: remove impurities, debris and loose and broken concrete on the crack wall that affect the bonding effect to expose the solid wall surface;

[0026] Step 2.5, drilling grouting holes: Determine the location, depth, and diameter of the grouting holes based on the damage of the cracks and then drill them;

[0027] Step 2.6, Crack Cleaning: After drilling, use a small industrial vacuum cleaner to clean the cracks;

[0028] Step 2.7, insert the grouting pipe: After the iron core grouting pipe is completely placed in the grouting hole, it is connected to the coil wrapped around the outside of the grouting pipe through a wire, and the other end of the wire is connected to the external resistor and power supply. Turn on the power supply when grouting;

[0029] Step 2.8: Repair the cracks on the road surface or dam surface using the steps described in Step 1.7 to Step 1.12.

[0030] When it comes to repairing holes in road or dam surfaces, the following steps are involved:

[0031] Step 3.1, Material Preparation: Prepare the materials and equipment required to fill the cracks, including the Super GPS disease detector, raw materials for magnetic mortar, drilling equipment, NdFeB strong magnets, grouting nozzles, resistors, power supplies, coils, iron core grouting tubes, and crack repair carts;

[0032] Step 3.2, Defect Exploration: Use a GPS defect detector to continuously detect defects along the defect location. Based on the detection results, inversely analyze the thickness of the structural layer, the structural layer where the void is generated, the void area, void shape, and void volume. When the GPS defect detector determines that the void is less than 5 meters, use a seismograph to verify the GPS defect detector results. Then, based on the detection results of the GPS defect detector and the seismograph, determine the defect situation and carry out emergency repair construction design;

[0033] Step 3.3, emergency repair design: Based on the disease survey results, determine the cavity treatment section and construction area, and determine the emergency repair plan, treatment hole diameter, treatment hole layout location and spacing, drilling depth, and raw material usage;

[0034] Step 3.4, Clean the road surface: Clean the construction surface, use a forest fire extinguisher or high-pressure air gun to blow out the damaged area, and remove debris;

[0035] Step 3.5, Construction Layout: According to the construction design, determine the construction sections and specific drilling locations at the construction site, and mark them with gray lines or spray paint;

[0036] Step 3.6, hole layout and drilling: Determine the drilling sequence based on the specific drilling locations determined by the construction layout, and mark them with gray lines or spray paint. Then, use the drill rig to drill holes at the appropriate speed according to the designed hole diameter and depth.

[0037] Step 3.7, grouting hole cleaning: After drilling, use a small industrial vacuum cleaner to clean the grouting hole;

[0038] Step 3.8, insert the grouting pipe: After the iron core grouting pipe is completely placed in the grouting hole, it is connected to the coil wrapped around the grouting pipe through a wire, and the other end of the wire is connected to the external resistor and power supply. Turn on the power supply when grouting;

[0039] Step 3.9: Repair the holes on the road or dam surface using the steps described in Step 1.7 to Step 1.12.

[0040] The specific method of cleaning in Step 1.3 is to absorb water, dry and vacuum the inner wall and bottom of the crack.

[0041] A drying device is used during the drying process, which includes an electric heating wire, a hot air pipe and a hair dryer. The hair dryer is arranged on the bottom plate of the crack repair trolley, the hot air pipe is connected to the hair dryer, and the electric heating wire is arranged in the hot air pipe.

[0042] Before grouting, apply waterproof coating on the inner wall and bottom of the crack, and then grouting after the waterproof coating solidifies.

[0043] Use a drilling tool to select drilling points along the cracks on the road surface or dam surface, and drill after the drilling points are determined. The drill bit diameter is 20mm~25mm, the drill bit depth is ≤ 2 / 3 of the structure thickness, the drill hole must pass through the crack, and the drilling spacing is 20cm~60cm.

[0044] The particle size of the magnetic mortar material is determined according to the width and depth of the crack;

[0045] When grouting, start from one end of the crack and proceed continuously with single holes one by one, adjusting the grouting pressure. When the adjacent hole begins to slurry out, maintain the pressure for at least 5 minutes, then stop grouting in this hole and start grouting in the adjacent grouting hole.

[0046] The iron core grouting pipe is composed of an inner magnetic isolation tube and an outer iron core tube, and a coil is wrapped around the outer wall of the iron core tube. The coil is connected to an external power supply through a wire. During grouting, the coil vibrates up and down and generates heat after being energized, thereby increasing the fluidity of the magnetic mortar.

[0047] The number of holes and drilled holes in Step 3.5 is determined by the shape of the cavity. When the shape of the cavity is relatively regular and the mortar is easy to flow, the number of drilled holes is designed to be one; when the shape of the cavity is irregular and the mortar is not easy to flow, the number of drilled holes is increased.

[0048] The grouting parameters are determined comprehensively based on the structural layer where the void is generated, the void area, void shape, void volume and construction equipment. The output pressure of the grouting equipment is at least 7 MPa, and the output of the graded magnetic mortar is 5 kg / min.

[0049] The present invention has the following beneficial effects:

[0050] 1. The present invention increases the fluidity of the mortar by adding asphalt and epoxy resin to the magnetic mortar repair material, making it easier for the mortar to penetrate into tiny cracks.

[0051] 2. By drilling along the cracks in the pavement or the slots obtained by grooving or expanding the cracks, not only can the repair material be effectively guided, but the cracks can also be more saturated, thereby increasing the adhesion between the repair material and the pavement and improving the structural strength of the repaired cracks.

[0052] 3. When there is no grouting pipe in the grouting hole, high-pressure grouting is performed on the cracks. The sealing of the cracks by epoxy resin putty can prevent the slurry from overflowing from the upper end of the cracks during grouting.

[0053] 4. By adjusting the repair device, the NdFeB strong magnet is placed on one side of the crack. A magnetic field is generated inside the crack, and the left and right flow range of the magnetic mortar is restricted. Under the action of high-intensity grouting pressure, the inside of the crack is repaired, thereby improving the filling rate of the crack slurry and the integrity of the road.

[0054] 5. The present invention uses a GRP disease detector to detect the interior of cracks on the road surface or dam surface, and determine the depth and width of cracks in different areas. Based on the measured parameters, the particle size of the repair material and the magnitude of the magnetic force required at different locations of the road surface or dam surface cracks are selected to ensure the best repair effect.

[0055] 6. Place a strong NdFeB magnet on one side of the crack to make it vibrate up and down, changing the size of the magnetic field inside the crack, so that bubbles in the slurry can be better removed during grouting.

[0056] 7. When grouting, the iron core grouting pipe built into the grouting hole adjusts the current by changing the resistance, so that the coil wrapped around the outside of the pipe wall generates a magnetic field, and generates up and down vibrations and heat, which can increase the magnetic field strength inside the crack, and also increase the fluidity of the magnetic slurry inside the crack, and can fully eliminate the bubbles in the magnetic slurry.

[0057] 8. The repair device and method of the present invention can be used not only to repair cracks, but also to repair cavities under the road surface or dam surface, and can also produce good repair effects in a dynamic water environment.

[0058] 9. Before grouting the cracks, clean the water and impurities in the grooves and apply a waterproof coating on the inner wall of the grooves to eliminate the impact of water on the filling process and prevent water from further penetrating into the grooves and damaging the crack structure.

[0059] 10. The repairing device of this invention is used to blow hot air into the slot to dry it, and at the same time, the suction device is used to absorb impurities, moisture and the hot air carrying impurities and moisture, which has good drying and impurity removal effects and also improves the service life after repair.

[0060] 11. Compared with traditional pavement repair methods, the repair device and method of the present invention are simple to operate, short in time, and require less manpower. They can also effectively solve the problem of repairing pavement cracks with larger depths, thereby preventing the traffic from being affected by road repairs and providing great convenience for traffic operations.

[0061] 12. Based on the above, the method of the present invention can significantly improve the ability of asphalt concrete pavement to resist vehicle loads and environmental factors, extend the service life of asphalt concrete pavement, and significantly reduce the cost of road maintenance and repair. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] The present invention will be further described below with reference to the accompanying drawings and examples.

[0063] Figure 1 Crack grouting repair flow chart;

[0064] Figure 2 This is a schematic diagram of a device for repairing cracks in a road surface or dam surface using magnetic mortar;

[0065] Figure 3 This is a schematic longitudinal cross-sectional view of a crack repair method according to a first embodiment of the present invention;

[0066] Figure 4 1 is a schematic longitudinal cross-sectional view of a crack repair process according to the second embodiment of the present invention;

[0067] Figure 5 1 is a schematic longitudinal cross-sectional view of the cavity repair process in the third embodiment of the present invention;

[0068] Figure 6 This is a detailed drawing of the iron core grouting pipe.

[0069] In the figure: grouting machine 1, magnetic mortar 2, storage bucket 3, crack repair trolley 4, NdFeB strong magnet 5, lifting spring device 6, grouting pipe 7, wire 8, resistor 9, hot air pipe 10, blow pipe 11, hair dryer 12, drying device 13, power supply 14, slot 15, road surface or dam surface 16, grouting hole 17, grouting nozzle 18, mortar diffusion area 19, magnetic mortar diffusion direction 20, bubble 21, cavity 22, coil 23, iron core grouting pipe 24, magnetic isolation tube 25, iron core tube 26, crack 27, epoxy resin putty 28, spring 29. DETAILED DESCRIPTION

[0070] The embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0071] Example 1:

[0072] See also Figure 1-6 A method for repairing cracks in road surfaces and dam surfaces using magnetic mortar includes a GPR defect detector for detecting the specific location, direction, length, and width of cracks 27 within the road surface or dam surface 16 to be repaired; a grouting machine 1 for grouting the interior of the cracks 27, the grouting machine 1 being connected to a grouting hole 17 machined at the location of the cracks 27 via a grouting pipe 7; the method includes the following steps:

[0073] Step 1.1, Material Preparation: Prepare the materials and equipment required to fill the cracks, including GPS disease detector, raw materials for magnetic mortar 2, drilling equipment, NdFeB strong magnet 5, grouting nozzle 18, epoxy resin putty 28 and crack repair cart 4;

[0074] Step 1.2, crack detection: Use GPS disease detection instrument to continuously detect along the disease location, and inversely analyze the structural layer thickness, crack length, crack width and crack depth parameters based on the detection results;

[0075] Step 1.3, slotting: slotting or expanding along the direction and shape of the crack 27 to obtain a slot 15;

[0076] Step 1.4, cleaning the groove wall: remove impurities, debris and loose and broken concrete on the crack wall that affect the bonding effect to expose the solid wall surface;

[0077] Step 1.5, drilling grouting holes: Determine the location, depth, and diameter of the grouting holes 17 according to the damage of the cracks and drill the holes;

[0078] Step 1.6, crack cleaning: After drilling, use a small industrial vacuum cleaner to clean the crack 27;

[0079] Step 1.7, burying the nozzle: bury the grouting nozzle 18 in the drilled hole and tighten it with a special Allen wrench to ensure that there is no gap between the grouting nozzle 18 and the drilled hole and no water leakage. The height of the grouting nozzle 18 is higher than the road surface or dam surface, and the crack 27 is sealed with epoxy resin putty 28;

[0080] Step 1.8, prepare magnetic mortar: Add iron powder, asphalt, curing agent, and epoxy resin materials to ordinary mortar according to a certain ratio and stir thoroughly to make magnetic mortar 2. Test its performance to ensure its normal use during the filling stage;

[0081] Step 1.9, Positioning of NdFeB Magnets: Based on the locations of the cracks 27 and the grouting holes, adjust the position of the crack repair cart 4 so that the NdFeB magnets 5 are positioned along the side of the crack. Utilize the lifting function of the equipment to ensure that the bottom surface of the NdFeB magnets 5 is in close contact with the road surface or dam surface 16. Then, activate the lifting spring device 6 of the NdFeB magnets 5 to cause the NdFeB magnets 5 to vibrate up and down.

[0082] Step 1.10, Grouting: Place the magnetic mortar 2 into the storage barrel 3, and use the grouting machine 1 to sequentially inject the magnetic mortar 2 into the grouting holes 17 through the grouting pipe 7 and the grouting nozzle 18. Due to the presence of the NdFeB strong magnet 5 on the crack plane, the crack 27 has a strong magnetic field within a certain range, so that the magnetic mortar 2 can be concentrated within the magnetic field range, preventing the magnetic mortar from spreading to both sides in the crack due to fluidity. Under the action of high-pressure grouting, the entire crack area can be filled more densely;

[0083] Step 1.11, remove and seal the nozzle: After grouting is completed, confirm that there is no leakage and remove or knock off the exposed grouting nozzle 18. Use epoxy resin putty 28 to seal the grouting nozzle 18. At the same time, apply waterproof material three times to the chemical grouting part according to the actual situation for surface waterproofing.

[0084] Step 1.12, quality acceptance: After the construction is completed, use a GPS defect detector or seismograph to conduct quality acceptance in accordance with quality requirements.

[0085] Example 2:

[0086] A method for repairing cracks on a road surface and a dam surface using magnetic mortar comprises the following steps:

[0087] Step 2.1, Material Preparation: Prepare the materials and equipment required to fill the cracks, including the Super GPS disease detector, raw materials for magnetic mortar, drilling equipment, NdFeB strong magnet 5, grouting nozzle 18, resistor 9, power supply 14, coil 23, iron core grouting tube 24 and crack repair cart 4;

[0088] Step 2.2, crack detection: Use GPS disease detection instrument to continuously detect along the disease location, and inversely analyze the structural layer thickness, crack length, crack width, and crack depth parameters based on the detection results;

[0089] Step 2.3, slotting: slotting or expanding along the direction and shape of the crack 27 to obtain a slot 15;

[0090] Step 2.4, cleaning the groove wall: remove impurities, debris and loose and broken concrete on the crack wall that affect the bonding effect to expose the solid wall surface;

[0091] Step 2.5, drilling grouting holes: Determine the location, depth, and diameter of the grouting holes 17 according to the damage of the cracks and drill the holes;

[0092] Step 2.6, crack cleaning: After drilling, use a small industrial vacuum cleaner to clean the crack 27;

[0093] Step 2.7, inserting the grouting pipe: After the iron core grouting pipe 24 is completely inserted into the grouting hole 17, it is connected to the coil 23 wrapped around the outside of the grouting pipe through the wire 8, and the other end of the wire is connected to the external resistor 9 and the power supply 14. When grouting, turn on the power supply 14;

[0094] Step 2.8: Repair the cracks on the road surface or dam surface using the steps described in Step 1.7 to Step 1.12.

[0095] When it comes to repairing a cavity 22 on a road surface or dam surface, the following steps are involved:

[0096] Step 3.1, Material Preparation: Prepare the materials and equipment required to fill the cracks, including the Super GPS disease detector, raw materials for magnetic mortar, drilling equipment, NdFeB strong magnet 5, grouting nozzle 18, resistor 9, power supply 14, coil 23, iron core grouting pipe 24 and crack repair cart 4;

[0097] Step 3.2, Defect Exploration: Continuously detect along the defect location using a GPS defect detector. Based on the detection results, inversely analyze the thickness of the structural layer, the structural layer position where the void 22 is generated, the area, shape, and volume of the void 22. If the GPS defect detector determines that the void 22 is less than 5 meters, use a seismograph to verify the GPS defect detector results. Then, based on the detection results of the GPS defect detector and the seismograph, determine the defect status and conduct emergency repair construction design.

[0098] Step 3.3, emergency repair design: Based on the disease survey results, determine the cavity 22 treatment section and construction area, and determine the emergency repair plan, treatment hole diameter, treatment hole layout location and spacing, drilling depth, and raw material usage;

[0099] Step 3.4, Clean the road surface: Clean the construction surface, use a forest fire extinguisher or high-pressure air gun to blow out the damaged area, and remove debris;

[0100] Step 3.5, Construction Layout: According to the construction design, determine the construction sections and specific drilling locations at the construction site, and mark them with gray lines or spray paint;

[0101] Step 3.6, hole layout and drilling: Determine the drilling sequence based on the specific drilling locations determined by the construction layout, and mark them with gray lines or spray paint. Then, use the drill rig to drill holes at the appropriate speed according to the designed hole diameter and depth.

[0102] Step 3.7, grouting hole cleaning: After drilling, use a small industrial vacuum cleaner to clean the grouting hole;

[0103] Step 3.8, inserting the grouting pipe: After the iron core grouting pipe 24 is completely placed in the grouting hole 17, it is connected to the coil 23 wrapped around the outside of the grouting pipe through the wire 8, and the other end of the wire is connected to the external resistor 9 and the power supply 14. Turn on the power supply when grouting;

[0104] Step 3.9, repair the road surface or dam surface cavity 22 using the steps described in Step 1.7 to Step 1.12.

[0105] Furthermore, the specific cleaning method in Step 1.3 is to absorb water, dry, and vacuum the inner wall and bottom of the crack 27. The drying process uses a drying device 13, which includes a heating wire, a hot air pipe 10, and a hair dryer 12. The hair dryer 12 is installed on the bottom plate of the crack repair cart 4. The hot air pipe 10 is connected to the hair dryer 12, and the heating wire is installed in the hot air pipe 10. Through the above-mentioned water absorption, drying, and vacuuming, the interior of the crack 27 can be effectively cleaned to ensure the effectiveness of subsequent crack filling.

[0106] Furthermore, before grouting, a waterproof coating is applied to the inner wall and bottom of the crack 27, and grouting is performed after the waterproof coating solidifies. Through the waterproof treatment, the influence of water seepage during the grouting process on the repair process is effectively prevented.

[0107] Furthermore, a drilling tool is used to select drilling points along the cracks 27 on the road surface or dam surface 16. Once the drilling points are determined, drilling is performed. The drill bit diameter is 20mm to 25mm, and the drill bit depth is ≤ 2 / 3 of the structure thickness. The holes must pass through the cracks 27, and the holes are spaced 20cm to 60cm apart. This ensures the effectiveness of subsequent grouting.

[0108] Furthermore, the particle size of the magnetic mortar 2 is determined based on the width and depth of the crack 27. Grouting is performed sequentially, starting from one end of the crack, with each hole continuously grouted. The grouting pressure is adjusted. When grouting begins to flow from an adjacent hole, the pressure is maintained for at least 5 minutes, at which point grouting is stopped and grouting is resumed in the adjacent hole. This grouting process ensures a consistently effective filling effect.

[0109] Furthermore, the iron core grouting tube 24 is composed of an inner magnetic isolation tube 25 and an outer iron core tube 26, and the outer wall of the iron core tube 26 is wound with a coil 23, which is connected to an external power supply 14 via a wire 8. During grouting, the coil vibrates up and down and generates heat after being energized, thereby increasing the fluidity of the magnetic mortar 2. By increasing the fluidity of the magnetic mortar, the crack filling effect is enhanced.

[0110] Furthermore, the number of holes and drilled holes in Step 3.5 is determined by the shape of the cavity of the cavity 22. When the shape of the cavity of the cavity 22 is relatively regular and the graded mortar is easy to flow, the number of drilled holes is designed to be one; when the shape of the cavity of the cavity 22 is irregular and the graded mortar is not easy to flow, the number of drilled holes is increased.

[0111] Furthermore, the grouting parameters are determined comprehensively based on the structural layer, area, shape, volume and construction equipment of the cavity 22. The output pressure of the grouting equipment is at least 7 MPa, and the output of the graded magnetic mortar is 5 kg / min.

Claims

1. A method for repairing cracks on road surfaces and dam surfaces using magnetic mortar, characterized in that: It includes a GPR disease detection instrument for detecting the specific location, direction, length and width data of internal cracks (27) of the road surface or dam surface (16) to be repaired; It also includes a grouting machine (1) for grouting the interior of the crack (27), wherein the grouting machine (1) is connected to a grouting hole (17) machined at the location of the crack (27) through a grouting pipe (7); The method comprises the following steps: Step 1.1, material preparation: prepare the materials and equipment required for filling the cracks, including GPS disease detector, raw materials required for magnetic mortar (2), drilling equipment, NdFeB strong magnet (5), grouting nozzle (18), epoxy resin putty (28) and crack repair cart (4); Step 1.2, crack detection: Use GPS disease detection instrument to continuously detect along the disease location, and inversely analyze the structural layer thickness, crack length, crack width and crack depth parameters based on the detection results; Step 1.3, slotting: slotting or expanding along the direction and shape of the crack (27) to obtain a slot (15); Step 1.4, cleaning the groove wall: remove impurities, debris and loose and broken concrete on the crack wall that affect the bonding effect to expose the solid wall surface; Step 1.5, drilling grouting holes: determine the location, depth, and diameter of the grouting holes (17) according to the damage of the cracks and drill the holes; Step 1.6, crack cleaning: After drilling, use a small industrial vacuum cleaner to clean the crack (27); Step 1.7, burying the nozzle: bury the grouting nozzle (18) in the drilled hole and tighten it with a special hexagonal wrench so that there is no gap around the grouting nozzle (18) and the drilled hole, and no water leakage. The height of the grouting nozzle (18) is higher than the road surface or dam surface, and the crack (27) is sealed with epoxy resin putty (28); Step 1.8, prepare magnetic mortar: add iron powder, asphalt, curing agent, and epoxy resin material into ordinary mortar according to a certain ratio and stir thoroughly to make magnetic mortar (2), and test its performance to ensure its normal use in the filling stage; Step 1.9, arranging the position of the NdFeB strong magnet: according to the position of the crack (27) and the grouting hole, the position of the crack repair trolley (4) is adjusted so that the NdFeB strong magnet (5) is arranged along the side of the crack, and then the lifting function of the equipment is used to make the bottom surface of the NdFeB strong magnet (5) close to the road surface or dam surface (16), and then the lifting spring device (6) of the NdFeB strong magnet (5) is turned on to make the NdFeB strong magnet (5) vibrate up and down; Step 1.10, grouting: Place the magnetic mortar (2) into the storage barrel (3), and use the grouting machine (1) to sequentially inject the magnetic mortar (2) into the grouting hole (17) through the grouting pipe (7) and the grouting nozzle (18). Due to the presence of the NdFeB strong magnet (5) on the crack plane, the crack (27) has a strong magnetic field within a certain range, so that the magnetic mortar (2) can be gathered within the magnetic field range, thereby preventing the magnetic mortar from spreading to both sides due to fluidity in the crack. Under the action of high-pressure grouting, the entire crack area can be filled more densely; Step 1.11, remove the nozzle and seal it: After the grouting is completed, confirm that there is no leakage and remove or knock off the exposed grouting nozzle (18). Use epoxy resin putty (28) to seal the grouting nozzle (18). At the same time, according to the actual situation, use waterproof material to apply three times to the chemical grouting part for surface waterproofing. Step 1.12, Quality Acceptance: After construction is completed, use a GPS defect detector or seismograph to conduct quality acceptance according to quality requirements; The particle size of the magnetic mortar (2) material is determined according to the width and depth of the crack (27); When grouting, start from one end of the crack and proceed continuously with single holes one by one, adjusting the grouting pressure. When the adjacent hole begins to slurry out, maintain the pressure for at least 5 minutes, then stop grouting in this hole and start grouting in the adjacent grouting hole.

2. A method for repairing cracks on road surfaces and dam surfaces using magnetic mortar, characterized in that: The following steps are involved: Step 2.1, material preparation: prepare the materials and equipment required for filling the cracks, including the super GPS disease detector, raw materials required for magnetic mortar, drilling equipment, NdFeB strong magnets (5), grouting nozzles (18), resistors (9), power supplies (14), coils (23), iron core grouting pipes (24) and crack repair carts (4); Step 2.2, crack detection: Use GPS disease detection instrument to continuously detect along the disease location, and inversely analyze the structural layer thickness, crack length, crack width, and crack depth parameters based on the detection results; Step 2.3, slotting: slotting or expanding along the direction and shape of the crack (27) to obtain a slot (15); Step 2.4, cleaning the groove wall: remove impurities, debris and loose and broken concrete on the crack wall that affect the bonding effect to expose the solid wall surface; Step 2.5, drilling grouting holes: determine the location, depth, and diameter of the grouting holes (17) according to the damage of the cracks and drill the holes; Step 2.6, crack cleaning: After drilling, use a small industrial vacuum cleaner to clean the crack (27); Step 2.7, inserting the grouting pipe: After the iron core grouting pipe (24) is completely inserted into the grouting hole (17), it is connected to the coil (23) wound outside the grouting pipe through the wire (8), and the other end of the wire is connected to the external resistor (9) and the power supply (14). When grouting, turn on the power supply (14); Step 2.8: Repair the cracks on the road or dam surface using the steps described in Step 1.7 to Step 1.12; The iron core grouting pipe (24) is composed of an inner magnetic isolation pipe (25) and an outer iron core pipe (26) nested together, and a coil (23) is wound around the outer wall of the iron core pipe (26). The coil is connected to an external power supply (14) through a wire (8). During grouting, the coil vibrates up and down and generates heat after being energized, thereby increasing the fluidity of the magnetic mortar (2).

3. A method for repairing cracks on road surfaces and dam surfaces using magnetic mortar, characterized in that: When it comes to repairing a void (22) in a road or dam surface, the following steps are involved: Step 3.1, material preparation: prepare the materials and equipment required for filling the cracks, including the super GPS disease detector, raw materials required for magnetic mortar, drilling equipment, NdFeB strong magnets (5), grouting nozzles (18), resistors (9), power supplies (14), coils (23), iron core grouting pipes (24) and crack repair carts (4); Step 3.2, damage exploration: Continuously detect along the damage location using a GPS damage detector, and inversely analyze the thickness of the structural layer, the structural layer position where the void (22) is generated, the area of ​​the void (22), the shape of the void (22), and the volume of the void (22) based on the detection results. When the GPS damage detector is used to detect and determine that the void (22) is less than 5 meters, use a seismograph to verify the detection results of the GPS damage detector. Then, based on the detection results of the GPS damage detector and the seismograph, determine the damage situation and carry out emergency repair construction design; Step 3.3, emergency repair design: Based on the results of the disease investigation, determine the cavity (22) treatment section and construction area, determine the emergency repair plan, treatment hole diameter, treatment hole layout location and spacing, drilling depth and raw material consumption; Step 3.4, Clean the road surface: Clean the construction surface, use a forest fire extinguisher or high-pressure air gun to blow out the damaged area, and remove debris; Step 3.5, Construction Layout: According to the construction design, determine the construction sections and specific drilling locations at the construction site, and mark them with gray lines or spray paint; Step 3.6, hole layout and drilling: Determine the drilling sequence based on the specific drilling locations determined by the construction layout, and mark them with gray lines or spray paint. Then, use the drill rig to drill holes at the appropriate speed according to the designed hole diameter and depth. Step 3.7, grouting hole cleaning: After drilling, use a small industrial vacuum cleaner to clean the grouting hole; Step 3.8, inserting the grouting pipe: After the iron core grouting pipe (24) is completely inserted into the grouting hole (17), it is connected to the coil (23) wound outside the grouting pipe through the wire (8), and the other end of the wire is connected to the external resistor (9) and the power supply (14). When grouting, the power supply is turned on; Step 3.9, repairing the road surface or dam surface cavity (22) using the steps described in claims Step 1.7 to Step 1.12; The iron core grouting pipe (24) is composed of an inner magnetic isolation pipe (25) and an outer iron core pipe (26) nested together, and a coil (23) is wound around the outer wall of the iron core pipe (26). The coil is connected to an external power supply (14) through a wire (8). During grouting, the coil vibrates up and down and generates heat after being energized, thereby increasing the fluidity of the magnetic mortar (2).

4. The method for repairing cracks on road surfaces and dam surfaces using magnetic mortar according to claim 1, characterized in that: The specific method of cleaning in Step 1.3 is to absorb water, dry and vacuum the inner wall and bottom of the crack (27).

5. A method for repairing cracks on road surfaces and dam surfaces using magnetic mortar according to claim 4, characterized in that: A drying device (13) is used during the drying process. The drying device (13) includes a heating wire, a hot air pipe (10) and a hair dryer (12). The hair dryer (12) is arranged on the bottom plate of the crack repair trolley (4). The hot air pipe (10) is connected to the hair dryer (12), and the heating wire is arranged in the hot air pipe (10).

6. The method for repairing cracks on road surfaces and dam surfaces using magnetic mortar according to claim 1, characterized in that: Before grouting, apply a waterproof coating on the inner wall and bottom of the crack (27), and then perform grouting after the waterproof coating solidifies.

7. The method for repairing cracks on road surfaces and dam surfaces using magnetic mortar according to claim 1, characterized in that: Use a drilling tool to select a drilling point along the crack (27) on the road surface or dam surface (16), and drill after the drilling point is determined. The drill bit diameter is 20mm~25mm, the drill bit depth is ≤ 2 / 3 of the structure thickness, the drill hole must pass through the crack (27), and the drilling spacing is 20cm~60cm.

8. The method for repairing cracks on road surfaces and dam surfaces using magnetic mortar according to claim 3, characterized in that: The number of holes and drilled holes in Step 3.5 is determined by the shape of the cavity of the cavity (22). When the shape of the cavity of the cavity (22) is relatively regular and the mortar with regular gradation is easy to flow, the number of drilled holes is designed to be one; when the shape of the cavity of the cavity (22) is irregular and the mortar with regular gradation is not easy to flow, the number of drilled holes is increased. The grouting parameters are determined comprehensively based on the structural layer position, area, shape, volume and construction equipment of the cavity (22). The output pressure of the grouting equipment is at least 7 MPa, and the output of the graded magnetic mortar is 5 kg / min.

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