Underground garage concrete leakage detection and repair method

Abstract

The invention discloses an underground garage concrete leakage detection and repair method and method.The method comprises the steps that an infrared thermal imager is used for detecting weak points of leakage water at the junction of a side wall and a bottom plate of an underground garage, and an acoustic emission instrument is used for detecting and repairing the water leakage problem of the underground garage; the method further comprises the step of installing the waterproof layer anti-floating replacement device. An infrared thermal imaging technology and image processing equipment are used for displaying leakage weak points at the junction of the side wall and the bottom plate of the garage, positioning grouting is conducted, a water stop needle is buried in a low-temperature dark-color area and repaired by injecting anti-dispersion slurry, and a nitrogen injection machine is adopted for injection in the section with the unobvious temperature difference to expand the temperature difference, so that the effect is obvious; for the water leakage problem of the underground garage bottom plate, an electric drill is used for drilling holes, water flow is guided to a drainage well for pressure relief, an acoustic emission instrument is used for being matched with other parts to arrange measuring points, and seepage acoustic emission signal data are analyzed to determine the seepage range and path. And the waterproof layer anti-floating replacement device is matched with the anti-floating mortar fixed point, so that the leakage damage part of the bottom plate is repaired.

Description

Technical Field

[0001] The invention belongs to the technical field of underground garage leakage detection and repair, and in particular relates to a method and method for detecting and repairing concrete leakage in an underground garage. Background Art

[0002] Compared with above-ground projects, underground projects are difficult to construct, have a longer construction period, and require a higher one-time investment. They require better thermal stability, airtightness, and disaster prevention and mitigation performance. Engineering practice shows that due to the complex and changeable geological environment of underground concrete structures, construction conditions and quality are difficult to guarantee. The penetration of groundwater and the corrosion of harmful ions in water are still the main factors that damage underground concrete structures. It not only affects the use function and life of the building, but may also affect the bearing capacity of the concrete structure and cause engineering accidents. A common practice in engineering is to sprinkle a layer of dry powder around the building and find the source of the leak by observing the path of water soaking the dry powder. This method is time-consuming and labor-intensive, and requires cleaning of the dry powder later, which is more troublesome. The underground garage leakage detection and repair system is not perfect; accurately locating the concrete leakage path and range greatly saves the use of manpower and financial resources and clarifies the scope of repair.

[0003] At the same time, the underground garage has been leaking water for a long time. The walls are affected by the geological environment and rainfall on the ground, and the groundwater level will fluctuate greatly. When the groundwater level is too high, it will produce a large water pressure. The water quality of groundwater is generally poor, and there are a lot of corrosive ions, which will cause erosion to the structure. Because there are various gaps in the underground concrete structure, and the concrete itself is a porous and inhomogeneous material, when the groundwater enters the concrete, it will cause the steel bars to rust and expand, thereby causing damage to the concrete and affecting the durability of the concrete structure.

[0004] The difficulty in its repair lies in determining the grouting material. Aiming at the anti-dispersion performance of cement-based grouting materials, high molecular polymers and inorganic materials are used to modify sulphoaluminate cement to provide a new anti-dispersion slurry; combined with iron oxide and oily epoxy resin, it cooperates with the anti-floating replacement device of the waterproof layer to play an anti-floating and stabilizing repair role. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a method for detecting and repairing concrete leakage in an underground garage. The method uses an infrared thermal imager to scan the area and uses image processing equipment to perform imaging. An obvious low-temperature area appears on the infrared thermal imaging image, and the highest temperatures of the surrounding buildings are higher than the temperature here. It can be inferred that the leakage is located in the low-temperature area. The weak points of the leakage can be determined from the image. Water-stop needles are buried at both ends of the low-temperature area, and the structure of the injected area is pierced. After the anti-dispersion slurry is prepared, the anti-dispersion slurry is injected into the water-facing surface of the structure using the water-stop needles.

[0006] The technical objectives of the present invention are achieved through the following technical solutions: A method for detecting and repairing concrete leakage in an underground garage comprises using an infrared thermal imager to detect weak points of water leakage at the junction of the side wall and the bottom plate of the underground garage, and using an acoustic emission instrument to detect and repair the water leakage problem of the underground garage; wherein, using the infrared thermal imager to detect weak points of water leakage at the junction of the side wall and the bottom plate of the underground garage specifically comprises the following steps: Step 1, material preparation: prepare infrared thermal imager, image processing equipment, water stop needle, anti-dispersion slurry, grouting machine and nitrogen injection machine; Step 2, use an infrared thermal imager to scan the possible leakage area and use image processing equipment to image it; Step 3: When an obvious low-temperature area appears on the infrared thermal imaging image, and the highest temperature of the surrounding buildings is higher than the temperature here, it can be inferred that the water leakage is located in the low-temperature area, and the weak point of the water leakage can be determined from the image; Step 4: bury the water stop needles at both ends of the low temperature area, with the spacing between the water stop needles being 15cm±3cm, and penetrate the structure of the injected area; Step 5, 6% of flocculant, water and sulphoaluminate cement in a weight ratio of 0.7:1, and 1.25% of defoamer are mixed and stirred to form an anti-dispersion slurry; Step 6, use a water stop needle to inject the anti-dispersion slurry into the water-facing surface of the structure; Step 7. For areas with very little water content, when the temperature difference in the detection path is not obvious, identify the color range of the image and use a nitrogen injector to inject nitrogen into the water-free area to lower the temperature of the area and increase the temperature difference. Repeat Step 1-Step 3 for detection and use image processing equipment for imaging to more accurately locate the leakage weak points.

[0007] Preferably, using an acoustic emission instrument to detect and repair water leakage in an underground garage specifically includes the following steps: S1, material preparation: prepare acoustic emission instrument, image processing equipment, sensor, signal amplifier, vaseline, measuring points 1-5, drill, grinder, hair dryer and scraper; S2, the instrument uses a PCI-2 acoustic emission instrument. Two commercial sensors are connected to the image processing device through a signal amplifier. The image processing device is connected to the acoustic emission instrument. Vaseline is used to couple the sensor to the concrete component. S3, according to the actual situation of the project site, the concrete bottom plate is drilled to release pressure. The number of holes is 5, forming 5 test points, the hole diameter is 1.6cm±0.4cm, and each test point is used as the center of the circle, and a circular detection area is set with a radius of 50cm and 100cm, which is divided into test point 1-5 leakage detection area, and then small test points are arranged on the circumference of the waterproof membrane at an angle of 45°, and 16 small test points are set in each area: S4, collect acoustic emission data at each test point, analyze the data at each point to obtain the signal distribution area pattern of the test point, for each of the 16 small test points in each test point, the test points with more collected signals indicate a larger amount of water seepage, and the test points with fewer collected signals indicate a smaller amount of water seepage, thereby inferring the leakage direction. The seepage direction is from the test point with more seepage signals to the test point with fewer seepage signals.

[0008] Preferably, the method further includes the step of installing an anti-floating replacement device for the waterproof layer, which specifically includes the following steps: Step 3.1, material preparation: anti-floating mortar, grouting machine, drilling rig, grinder, hair dryer, shovel, waterproof layer anti-floating replacement device, the waterproof layer anti-floating replacement device includes a waterproof layer anti-floating replacement cover, a double-end threaded anti-floating anchor rod, a lower end anti-floating support cage and a nut. The lower end anti-floating support cage is a steel cage made of hard fine steel bars, with a threaded hole at the upper end, and the threaded hole is used to connect with the double-end threaded anti-floating anchor rod; Step 3.2, use a drilling machine to drill holes in the weak point area and expand the holes; during the construction, pre-dig the floor to a certain depth; Step 3.3, rotate and fix three double-end threaded anti-floating anchor rods to the lower end anti-floating support cage and place them in the drill hole; Step 3.4, 6% flocculant, water: sulphoaluminate cement with a mass ratio of 0.7:1, 1.25% defoamer, 720g of oily epoxy resin A liquid, and 800g of Fe3O4 magnetic powder are mixed and stirred evenly in a mixer to make anti-floating mortar, and the anti-floating mortar is injected from three double-ended threaded anti-floating anchor rods until the grouting holes are filled; Step 3.5, after grouting is completed, install the upper waterproof layer anti-floating replacement cover and tighten it with nuts; Step 3.6, use anti-floating mortar to level the ground.

[0009] Preferably, the infrared thermal imager has an infrared resolution of 384 pixels×288 pixels, a test temperature range of -20°C to 650°C, a temperature sensitivity of 0.05°C at 30°C, a spatial resolution of 1.14 mrad, and an image frame rate of 60 Hz.

[0010] Preferably, the waterstop needle is generally divided into two layers, an aluminum alloy outer layer and a grouting inner layer are concentrically arranged, and the sealant is injected between the two in advance. A rubber sleeve is placed on the end of the waterstop needle, and a destructive crack is reserved in the aluminum alloy outer layer. When the waterstop needle is subjected to a certain external force, the reserved destructive crack is destroyed and opened, and the sealant overflows and flows out in the direction of insertion of the waterstop needle, so that a seal is formed between the wall surface and the waterstop needle; when in use, the waterstop needle and the wall surface vertical to the ground are buried 45° downward, and the anti-dispersion slurry is injected into the gap inside the concrete using the continuous high pressure generated by the grouting machine to completely fill the gap.

[0011] Preferably, the waterproof layer anti-floating replacement cover is cylindrical as a whole, including a bottom cover and a top cover, and a TPE material layer is between the bottom cover and the top cover.

[0012] Compared with the prior art, the present invention has the following beneficial effects: 1. For underground garages with continuous rainfall, the groundwater level is too high, causing a large amount of water to accumulate in the garage. The groundwater pressure is relatively high, the bottom plate is lifted up, and multiple cracks are generated. The entire bottom plate is wrapped by external materials. The infrared thermal imaging technology may not be able to detect the bottom plate structure and the location and direction of the leakage water. The implementation scheme of the invention uses acoustic emission technology to detect the direction of the leakage channel of the bottom plate. By arranging five measuring points, each measuring point has 16 small measuring points, and the number of small measuring point reaction signals is used to judge the content and flow direction of the leakage water, so as to accurately replace the bottom plate area. For the junction of the side wall and the bottom plate of the underground garage with long-term water seepage, it is often the weak point of water leakage, but its specific location is often difficult to identify. Using traditional methods, it is time-consuming and labor-intensive to judge the source of the leakage water. There are errors. The present invention uses the obvious low-temperature area on the infrared thermal imaging map, and the highest temperature of the surrounding buildings is higher than the temperature here. It can be inferred that the leakage water is located in the low-temperature area. The weak point of the leakage water is judged from the image phase.

[0013] 2. The self-made waterproof layer anti-floating replacement device of the present invention has a small volume and weight and can be constructed indoors. Compared with the anti-floating anchor rods in common construction, the present invention is simple to construct and simple to operate. Through the preparation and grouting of special anti-floating mortar and the cooperation with the device, the gravity of the slurry and the magnetic attraction and cohesion of the magnetic slurry contained inside, as well as the elastic force of the internal material of the upper waterproof layer anti-floating replacement cover itself act on the upper end of the device and the lower end of the device inside the soil, exerting a force on the anti-floating replacement cover of the waterproof layer on the ground, and the ground has a reaction force effect on the component, thereby achieving an anti-floating effect. Compared with ordinary anti-floating anchor rods, the slurry and the ground connection strength is higher.

[0014] 3. During the use of common waterstop needles, the sealant is initially applied: secondly, a layer of sealant is applied inside the hole. After the waterstop needle is inserted, the sealant needs to be applied around the hole for one-step sealing: after the waterstop needle is in place, the sealant is added at the joints and edges. Make sure that all gaps are effectively sealed. Surface sealing and finishing: The sealant runs through the entire waterstop needle, and the operation is complicated. The homemade waterstop needle of the present invention consists of a two-layer structure, in which a sleeve layer is added to the outer layer of the original waterstop needle, and the sealant is injected into the sleeve layer from the grouting hole. Cracks are left on the outer wall of the sleeve layer. When external force is applied to drill the waterstop needle into the borehole, the cracks are cracked by the force, and the sealant spreads to the surroundings until the waterstop needle is completely inserted into the hole.

[0015] 4. In engineering projects, a layer of dry powder is often sprinkled around the building, and the source of the water leakage is found by observing the path of the water flow soaking the dry powder. This method is time-consuming and labor-intensive, and the dry powder needs to be cleaned up later, which is rather troublesome. In particular, the leakage detection and repair system for underground garages is not perfect; using the implementation method of the invention to accurately locate the path and scope of concrete leakage greatly saves the use of manpower and financial resources, clarifies the scope of repair, and thus utilizes a new type of water-resistant dispersant to be injected into the wall through a water-stop needle, thereby organizing the diffusion of the water level at the leakage point and flowing into the deep of the building to damage the building. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the infrared thermal imager detecting the interface between the side wall and the bottom plate of the present invention.

[0017] Figure 2 It is a schematic structural diagram of the water stop needle of the present invention.

[0018] Figure 3 It is a schematic diagram of the arrangement of five measuring points in the present invention.

[0019] Figure 4 This is a connection diagram of the acoustic emission instrument, image processing equipment, sensor, and signal amplifier in the present invention.

[0020] Figure 5 It is a comparison diagram of the stress state before and after the installation of the waterproof layer anti-floating replacement device in the present invention.

[0021] Figure 6 It is a schematic structural diagram of the anti-floating replacement device for the waterproof layer in the present invention.

[0022] In the above drawings: 1. infrared thermal imager; 2. acoustic emission instrument; 3. image processing equipment; 4. sensor; 5. signal amplifier; 6. water stop needle; 7. ground; 8. threaded hole; 9. anti-floating mortar; 10. test point; 11. grouting machine; 12. aluminum alloy outer layer; 13. grouting inner layer; 14. destructive crack; 15. grouting hole; 16. TPE material layer; 17. rubber sleeve; 18. waterproof layer anti-floating replacement device; 19. waterproof layer anti-floating replacement cover; 20. double-ended threaded anti-floating anchor rod; 21. lower end anti-floating support cage; 22. nut. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] like Figure 1 As shown, as a preferred embodiment of the present invention, this embodiment provides a method for detecting and repairing concrete leakage in an underground garage, including using an infrared thermal imager 1 to detect weak points of water leakage at the junction of the side wall and the bottom plate of the underground garage, and using an acoustic emission device 2 to detect and repair the water leakage problem in the underground garage; wherein, using the infrared thermal imager 1 to detect weak points of water leakage at the junction of the side wall and the bottom plate of the underground garage specifically includes the following steps: Step 1, material preparation: prepare infrared thermal imager 1, image processing equipment 2, water stop needle 6, anti-dispersion slurry, grouting machine 11 and nitrogen injection machine. The infrared resolution of infrared thermal imager 1 is 384 pixels × 288 pixels, the test temperature range is: -20℃~650℃, the temperature sensitivity at 30℃ is: 0.05℃, the spatial resolution is 1.14mrad, and the image frame rate is 60Hz; Step 2: For the junction of the side wall and the bottom plate of the underground garage where water has been seeping for a long time, which is often a weak point of water leakage, an infrared thermal imager 1 is used to scan the possible leakage area, and an image processing device 3 is used to image it; Step 3: When an obvious low-temperature area appears on the infrared thermal imaging image, and the highest temperature of the surrounding buildings is higher than the temperature here, it can be inferred that the water leakage is located in the low-temperature area, and the weak point of the water leakage can be determined from the image; Step 4, bury multiple water stop needles 6 at both ends of the low temperature area, with the spacing between the water stop needles being 15cm±3cm, and penetrate the structure of the injection area; Step 5, 6% of flocculant, water and sulphoaluminate cement in a weight ratio of 0.7:1, and 1.25% of defoamer are mixed and stirred to form an anti-dispersion slurry; Step 6, using the water stop needle 6 to inject the anti-dispersion slurry into the water-facing surface of the structure; Step 7. For areas with very little water content, when the temperature difference in the detection path is not obvious, identify the color range of the image and use a nitrogen injector to inject nitrogen into the water-free area to lower the temperature of the area and increase the temperature difference. Repeat Step 1-Step 3 for detection and use image processing equipment for imaging to more accurately locate the leakage weak points.

[0025] In the above embodiments, specifically, Figure 2 As shown, the waterstop needle 6 is generally divided into two layers, the aluminum alloy outer layer 12 and the grouting inner layer 13 are concentrically arranged, and the sealant is injected between the two in advance. A rubber sleeve 17 is placed at the end of the waterstop needle 6, and a destruction crack 14 is reserved in the aluminum alloy outer layer 12. When the waterstop needle 6 is subjected to a certain external force, the reserved destruction crack 14 is destroyed and opened, and the sealant overflows and flows out along the insertion direction of the waterstop needle 6, so that a seal is formed between the wall surface and the waterstop needle 6; when in use, the waterstop needle 6 and the wall surface vertical to the ground are buried 45° downward, and the anti-dispersion slurry is injected into the gap inside the concrete by using the continuous high pressure generated by the grouting machine 11 to completely fill the gap.

[0026] In the above embodiment, the flocculant is prepared by mixing three substances: HEC (0.1%), PAM (0.05%), and silica fume (3%); a new type of water-resistant dispersant can be prepared, and the grouting material prepared by the water-resistant dispersant has good water retention and high water-resistant dispersibility. The sulphoaluminate cement uses Yunhe brand 42.5 grade fast-hardening sulphoaluminate cement as the cementing material, and its main clinker minerals are anhydrous calcium sulphoaluminate, dicalcium silicate and gypsum. The clinker minerals can quickly undergo hydration and hardening reactions to form a stone body. The stone body of sulphoaluminate cement has excellent impermeability, frost resistance, early strength, high strength and erosion resistance. However, ordinary sulphoaluminate cement will be diluted and dispersed under the action of dynamic water, and its erosion resistance is poor. The sulphoaluminate cement is prepared by flocculants and defoamers to fully utilize the advantages of sulphoaluminate cement and overcome its shortcomings.

[0027] The defoaming agent is a silicone defoaming agent purchased from Tianjin Weihe Technology Development Co., Ltd. It has a small dosage and can effectively inhibit the generation of bubbles.

[0028] like Figure 4 As shown, when the acoustic emission instrument 2 is used to detect and repair the water leakage problem in the underground garage, the following steps are specifically included: S1, material preparation: prepare acoustic emission instrument 2, image processing equipment 3, sensor 4, signal amplifier 5, vaseline, drill, grinder, hair dryer and scraper; S2, the instrument uses a PCI-2 acoustic emission instrument, two sensors 4 are connected to an image processing device 3 through a signal amplifier 5, the image processing device 3 is connected to the acoustic emission instrument 2, and vaseline is used to couple the sensors 4 to the concrete component. S3, according to the actual situation of the project site, the concrete bottom plate is drilled to release pressure. The number of holes is 5, forming 5 test points, the hole diameter is 1.6cm±0.4cm, and each test point 10 is used as the center of the circle, and a circular detection area is set with a radius of 50cm and 100cm, which is divided into test point 1-5 leakage detection area, and then small test points are arranged on the circumference of the waterproof membrane at an angle of 45°. Each area is set with 16 small test points, refer to Figure 3 , Figure 3 The distribution of test points in an embodiment of the present invention is shown as follows: S4, collecting acoustic emission data for each test point, analyzing the data of each point to obtain the signal distribution area law of the test point, for each of the 16 small test points in each test point, the test points with more collected signals indicate more water seepage, and the test points with fewer collected signals indicate less water seepage, thereby inferring the leakage direction. The seepage direction is from the test points with more seepage signals to the test points with fewer seepage signals. For example, the seepage signal index of test point 1 is 15, and the seepage signal of test point 2 is index 6, then the water flow direction is from test point 1 to test point 2.

[0029] In some preferred embodiments, Figure 5 and Figure 6 As shown, FIG. 7 is the ground, and also includes the step of installing the waterproof layer anti-floating replacement device, which specifically includes the following steps; Step 3.1, material preparation: anti-floating mortar 9, grouting machine 11, drilling rig, grinder, hair dryer, shovel, waterproof layer anti-floating replacement device 18, the waterproof layer anti-floating replacement device 18 includes a waterproof layer anti-floating replacement cover 19, a double-end threaded anti-floating anchor rod 20, the double-end threaded anti-floating anchor rod 20 is a hollow structure, a lower end anti-floating support cage 21 and a nut 22, the lower end anti-floating support cage 21 is a steel cage made of hard fine steel bars, and a threaded hole 8 is left at the upper end, and the threaded hole 8 is used to connect with the double-end threaded anti-floating anchor rod 20; Step 3.2, use a drilling machine to drill holes in the weak point area and expand the holes; during the construction, pre-dig the floor to a certain depth; Step 3.3, three double-end threaded anti-floating anchor rods 20 are rotated and fixedly connected to the lower end anti-floating support cage 21 and then placed in the drill hole; Step 3.4, 6% flocculant, water: sulphoaluminate cement with a mass ratio of 0.7:1, 1.25% defoamer, 720g of oily epoxy resin A liquid, and 800g of Fe3O4 magnetic powder are mixed and stirred evenly with a mixer to form an anti-floating mortar 9, and the anti-floating mortar is injected from three double-end threaded anti-floating anchor rods 20 until the grouting holes are filled; Step 3.5, after the grouting is completed, install the upper waterproof layer anti-floating replacement cover 19 and tighten it with the nut 22; Step 3.6, use anti-floating mortar to level the ground.

[0030] In some preferred embodiments, a magnetically insulating soft iron material may be applied inside the double-ended threaded anti-floating anchor rod 20 to prevent the flow rate of the anti-floating slurry from slowing down during grouting.

[0031] In some preferred embodiments, the waterproof layer anti-floating replacement cover 19 is cylindrical as a whole, including a bottom cover and a top cover, and a TPE material layer 16 is provided between the bottom cover and the top cover. TPE material is a type of material with rubber elasticity and plastic processability. It combines the properties of thermoplastics and thermosetting rubbers, has excellent elasticity and flexibility, and also has good wear resistance, oil resistance and waterproof properties. The waterproof layer anti-floating replacement cover 19 can replace the ground leakage damage area and play a role in plugging the upper leakage.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A method for detecting and repairing concrete leakage in an underground garage, characterized in that: It includes using an infrared thermal imager to detect the weak points of water leakage at the junction of the side wall and the bottom plate of the underground garage, and using an acoustic emission instrument to detect and repair the water leakage problem of the underground garage; wherein, using an infrared thermal imager to detect the weak points of water leakage at the junction of the side wall and the bottom plate of the underground garage specifically includes the following steps: Step 1, material preparation: prepare infrared thermal imager, image processing equipment, water stop needle, anti-dispersion slurry, grouting machine and nitrogen injection machine; Step 2, use an infrared thermal imager to scan the possible leakage area and use image processing equipment to image it; Step 3: When an obvious low-temperature area appears on the infrared thermal imaging image, and the highest temperature of the surrounding buildings is higher than the temperature here, it can be inferred that the water leakage is located in the low-temperature area, and the weak point of the water leakage can be determined from the image; Step 4: bury the water stop needles at both ends of the low temperature area, with the spacing between the water stop needles being 15cm±3cm, and penetrate the structure of the injected area; Step 5, 6% of flocculant, water and sulphoaluminate cement in a weight ratio of 0.7:1, and 1.25% of defoamer are mixed and stirred to form an anti-dispersion slurry; Step 6, use a water stop needle to inject the anti-dispersion slurry into the water-facing surface of the structure; Step 7. For areas with very little water content, when the temperature difference in the detection path is not obvious, identify the color range of the image and use a nitrogen injector to inject nitrogen into the water-free area to lower the temperature of the area and increase the temperature difference. Repeat Step 1-Step 3 for detection and use image processing equipment for imaging to more accurately locate the leakage weak points.

2. The method for detecting and repairing concrete leakage in an underground garage according to claim 1, characterized in that: The use of acoustic emission instrument to detect and repair water leakage in underground garages specifically includes the following steps: S1, material preparation: prepare acoustic emission instrument, image processing equipment, sensor, signal amplifier, vaseline, measuring points 1-5, drill, grinder, hair dryer and scraper; S2, the instrument uses a PCI-2 acoustic emission instrument. The two sensors are connected to the image processing device through a signal amplifier. The image processing device is connected to the acoustic emission instrument. Vaseline is used to couple the sensor to the concrete component. S3, according to the actual situation of the project site, the concrete bottom plate is drilled to release pressure. The number of holes is 5, forming 5 test points, the hole diameter is 1.6cm±0.4cm, and each test point is used as the center of the circle, and a circular detection area is set with a radius of 50cm and 100cm, which is divided into test point 1-5 leakage detection area, and then small test points are arranged on the circumference of the waterproof membrane at an angle of 45°, and 16 small test points are set in each area: S4, collect acoustic emission data at each test point, analyze the data at each point to obtain the signal distribution area pattern of the test point, for each of the 16 small test points in each test point, the test points with more collected signals indicate a larger amount of water seepage, and the test points with fewer collected signals indicate a smaller amount of water seepage, thereby inferring the leakage direction. The seepage direction is from the test point with more seepage signals to the test point with fewer seepage signals.

3. A method for detecting and repairing concrete leakage in an underground garage according to claim 1 or 2, characterized in that: The step of installing a waterproof layer anti-floating replacement device is also included, which specifically includes the following steps: Step 3.1, material preparation: anti-floating mortar, grouting machine, drilling machine, grinder, hair dryer, shovel, waterproof layer anti-floating replacement device, the waterproof layer anti-floating replacement device (18) comprises a waterproof layer anti-floating replacement cover (19), a double-end threaded anti-floating anchor rod (20), a lower end anti-floating support cage (21) and a nut (22), the lower end anti-floating support cage (21) is a steel cage made of hard fine steel bars, with a threaded hole at the upper end, the threaded hole is used to connect with the double-end threaded anti-floating anchor rod (20); Step 3.2, use a drilling machine to drill holes in the weak point area and expand the holes; during the construction, pre-dig the floor to a certain depth; Step 3.3, rotate and fix three double-end threaded anti-floating anchor rods to the lower end anti-floating support cage and place them in the drill hole; Step 3.4, 6% flocculant, water: sulphoaluminate cement with a mass ratio of 0.7:1, 1.25% defoamer, 720g of oily epoxy resin A liquid, and 800g of Fe3O4 magnetic powder are mixed and stirred evenly in a mixer to make anti-floating mortar, and the anti-floating mortar is injected from three double-ended threaded anti-floating anchor rods until the grouting holes are filled; Step 3.5, after the grouting is completed, install the upper waterproof layer anti-floating replacement cover and tighten it with nuts (22); Step 3.6, use anti-floating mortar to level the ground.

4. The method for detecting and repairing concrete leakage in an underground garage according to claim 1, characterized in that: The infrared resolution of the infrared thermal imager is 384 pixels×288 pixels, the test temperature range is: -20°C to 650°C, the temperature sensitivity at 30°C is: 0.05°C, the spatial resolution is 1.14mrad, and the image frame rate is 60Hz.

5. The method for detecting and repairing concrete leakage in an underground garage according to claim 1, characterized in that: The water stop needle (6) is generally divided into two layers, an aluminum alloy outer layer (12) and a grouting inner layer (13) are arranged concentrically, and a sealant is injected between the two in advance. A rubber sleeve (17) is arranged at the end of the water stop needle (6), and a destructive crack (14) is reserved in the aluminum alloy outer layer (12). When the water stop needle (6) is subjected to a certain external force, the reserved destructive crack (14) is destroyed and opened, and the sealant overflows and flows out along the insertion direction of the water stop needle (6), so that a seal is formed between the wall surface and the water stop needle (6); when in use, the water stop needle (6) and the wall surface along the vertical ground are buried at 45 degrees downward, and the anti-dispersion slurry is injected into the gap inside the concrete by using the continuous high pressure generated by the grouting machine (11) to completely fill the gap.

6. The method for detecting and repairing concrete leakage in an underground garage according to claim 3, characterized in that: The waterproof layer anti-floating replacement cover (19) is cylindrical in shape as a whole, and comprises a bottom cover and a top cover, with a TPE material layer between the bottom cover and the top cover.

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