Road and bridge crack repairing technology and repairing structure

Abstract

The invention relates to the technical field of road and bridge maintenance, in particular to enhanced design of a crack repairing process. According to the road and bridge crack repairing technology, multi-source data preprocessing is conducted on scanning data through edge computing equipment, accurate recognition is achieved according to crack width classification marking, corresponding repairing operation is adopted for different types of cracks, for example, fine repairing materials and methods are adopted for small cracks to avoid damage expansion, and the repairing efficiency is improved. Structural reinforcing materials are adopted for wide cracks to enhance the repair strength, diversified crack repair structures are formed to adapt to various crack characteristics, meanwhile, key information is recorded to assist in follow-up maintenance management, and after traffic opening, a quality report is generated through rechecking and detection to evaluate and optimize the repair effect, so that the defect of a single repair process is effectively overcome, and the repair efficiency is improved. And the repairing effect and the structural safety are obviously improved.

Description

Technical Field

[0001] The present invention relates to the technical field of road and bridge maintenance, in particular to an enhanced design of a crack repair process. Background Art

[0002] Road and bridge crack repair refers to the process of repairing, reinforcing and sealing cracks on roads (pavements) and bridges (concrete or steel structures) using a series of technical means. Its core goals are: 1. Restoring structural integrity and strength: preventing cracks from further expanding and restoring the bearing capacity of components; 2. Preventing the intrusion of harmful substances: sealing cracks to prevent water, deicing salt, air (causing steel corrosion), chemicals, debris, etc. from entering the structure, avoiding further deterioration of internal materials (such as steel bars, concrete, and steel structures); 3. Improving durability and extending service life: significantly extending the service life of roads and bridges by preventing the deterioration process; 4. Ensuring driving safety and comfort: repairing road cracks can prevent vehicle jumping, reduce noise, and improve flatness; repairing bridge cracks can ensure structural safety and reliability; 5. Improving aesthetics: eliminating or reducing visible crack marks.

[0003] In the prior art, Chinese patent document CN114991024A discloses a road and bridge crack repair process. This technical solution uses a mechanical device to automatically lay carbon fiber cloth and precisely inject the repair material. First, the crack is manually widened to form a rectangular repair cavity. Cylindrical widening grooves are created on both sides of the cavity bottom and then coated with adhesive. A repair structure pre-installed with carbon fiber cloth (consisting of a repair plate, elastic sheet, widening roller, and fixed roller) is then inserted into the cavity. When the repair plate is pressed downward, the elastic sheet drives the widening roller into the groove, automatically unfolding the loose carbon fiber cloth and tightly fitting it to the cavity wall. Finally, asphalt repair fluid is injected through the repair plate's tamping cavity. A magnetic vibrator, driven by a magnetic rod, moves up and down to remove bubbles and enhance bonding. Finally, the tamping plate is inserted to seal the surface and complete the repair.

[0004] However, the above technical solution has the following defects: First, a single repair process is used for various cracks. When the cracks are artificially widened to form rectangular repairs, it is easy to expand and damage small cracks; and for wider cracks, only carbon fiber cloth and asphalt repair fluid are used, and the structural reinforcement is insufficient. Summary of the Invention

[0005] In order to overcome the above-mentioned defects in the prior art, a road bridge crack repair process is provided.

[0006] The present invention is achieved through the following technical solutions: A road bridge crack repair process, comprising the following steps:

[0007] S1, scanning stage: Scan the road or bridge surface through the vehicle-mounted multi-source sensing system;

[0008] S2. Real-time diagnosis and preliminary classification: The scan data obtained in step S1 is preprocessed using an edge computing device, and the crack width is calculated based on the preprocessing results. The cracks are then preliminarily classified and marked according to the crack width.

[0009] S3. Precise repair: Based on the preliminary classification and labeling results of step S2, corresponding repair operations are taken for different types of cracks;

[0010] S4. Quality control: Use edge computing devices to record the crack location coordinates, crack type marking information, and crack repair time information; and after the repair area is opened to traffic, conduct a review and inspection of the repair area to generate a repair quality report.

[0011] As a preferred embodiment of the present invention, in step S2, the specific method of preliminarily classifying and marking the cracks according to their width is as follows:

[0012] When w is less than 0.1 mm, it is marked as microcracks;

[0013] When w is greater than or equal to 0.1 mm and less than 0.3 mm, it is marked as a fine crack;

[0014] When w is greater than or equal to 0.3 mm and less than 0.5 mm, it is marked as a medium crack;

[0015] When w is greater than or equal to 0.5 mm, it is marked as a wide crack.

[0016] As a preferred embodiment of the present invention, in step S2, for cracks marked as fine cracks, the crack activity index (CAI) is calculated based on the preprocessing results, and the fine cracks are further classified and marked based on the CAI value:

[0017] When CAI is less than or equal to 0.15, it is marked as a small crack that needs to be observed;

[0018] When CAI is greater than 0.15, it is marked as requiring preventive repair of fine cracks.

[0019] As a preferred embodiment of the present invention, cracks marked as microcracks and cracks that need to be observed are marked and observed;

[0020] Carry out preventive repairs on cracks marked as requiring preventive repair of minor cracks;

[0021] Perform detailed repairs on cracks marked as medium cracks;

[0022] Perform intensive repairs on cracks marked as wide cracks.

[0023] As a preferred embodiment of the present invention, when performing preventive repair on cracks marked as requiring preventive repair of fine cracks, the following steps are included:

[0024] Step 1: Surface treatment: clean the dust and oil within 5cm on both sides of the small cracks;

[0025] Step 2: Inject glue to seal, inject the sealing layer into the small cracks through a conical nozzle to form a sealing layer;

[0026] Step 3: Seal the surface and apply acrylic emulsion protective agent. Cover the small cracks within 10 cm on both sides of the cracks to form a surface protective layer.

[0027] As a preferred embodiment of the present invention, when performing fine repair on a crack marked as a medium crack, the following steps are included:

[0028] Step 1: Grooving: Create a U-shaped groove along the middle crack, remove debris from the U-shaped groove and wipe it with acetone;

[0029] Step 2: Bury the glue injection nozzles and evenly bury multiple glue injection pumps in the U-shaped groove. Aim the glue injection nozzles of the glue injection pumps at the middle crack and seal the surface of the U-shaped groove and the middle crack with the sealing glue.

[0030] Step 3: Pressure injection: inject the epoxy resin in the injection pump from the lowest injection nozzle, and stop injecting when the adjacent injection nozzle overflows, thus forming an epoxy resin injection layer;

[0031] Step 4: Reinforcement treatment: After the epoxy resin infusion layer is cured, remove the sealant, apply epoxy base liquid in the U-shaped groove, embed the glass fiber mesh tape and scrape it flat to form a fiber reinforced tape layer.

[0032] As a preferred embodiment of the present invention, when strengthening and repairing cracks marked as wide cracks, the following steps are included:

[0033] Step 1: Chisel out and plant reinforcement. Chisel out the loose concrete on both sides of the wide crack to a solid layer. Drill multiple installation holes perpendicular to the wide crack along its crack trajectory. Plant threaded steel bars in the holes and inject epoxy rebar glue to form a steel bar anchoring layer.

[0034] Step 2: Mortar filling: inject mortar into the wide cracks and compact the mortar layer by layer to form a mortar filling layer;

[0035] Step 3: Carbon fiber cloth reinforcement: Apply epoxy impregnation glue within a range of more than 20 cm on both sides of the wide crack, and stick carbon fiber cloth across the wide crack in the form of a U-shaped hoop to form a carbon fiber cloth reinforcement layer.

[0036] As a preferred embodiment of the present invention, cracks marked as requiring preventive repair: traffic is opened 24 hours after repair, and the ambient temperature must be greater than 5°C and the humidity must be less than 80%; cracks marked as medium cracks: traffic is opened 48 hours after repair, and the curing temperature must be greater than 10°C; cracks marked as wide cracks: traffic is opened 7 days after repair, and the period is extended to 14 days in heavy load areas.

[0037] As a preferred embodiment of the present invention, in step S1: the vehicle-mounted multi-source sensing system includes: a high-definition linear array camera for capturing the surface morphology of the crack; a laser profiler for measuring the depth and width of the crack; an infrared thermal imager for identifying hidden cracks and internal voids; a GPS+RTK locator and an IMU inertial unit for spatial positioning and compensating for vehicle vibration errors.

[0038] A road bridge crack repair structure includes: a fine crack repair structure, a medium crack repair structure and a wide crack repair structure; the fine crack repair structure includes a micro-crack body, a sealing layer and a surface protection layer; the medium crack repair structure includes a medium crack body, an epoxy resin infusion layer and a fiber reinforced belt layer; the wide crack repair structure includes a wide crack body, a mortar filling layer, a steel anchoring layer and a carbon fiber cloth reinforcement layer.

[0039] Compared with the prior art, the present invention has the following beneficial effects:

[0040] A road bridge crack repair process uses edge computing equipment to perform multi-source data preprocessing on scanned data, classifies and labels cracks according to their width for accurate identification, and then takes corresponding repair operations for different types of cracks. For example, fine cracks are repaired with refined materials and methods to avoid further damage, while wider cracks are repaired with structural reinforcement materials to enhance the repair strength. This creates a variety of crack repair structures to accommodate various crack characteristics. Key information is recorded to assist with subsequent maintenance and management, and a quality report is generated after the bridge is opened to traffic to evaluate and optimize the repair effect. This effectively addresses the drawbacks of a single repair process and significantly improves the repair effect and structural safety.

[0041] Furthermore, detailed classification of cracks will help to develop more reasonable repair plans for different types of cracks, making the repair work more targeted and scientific, and improving the quality of repair.

[0042] Furthermore, further refinement of the classification of small cracks can more accurately determine the development trend of small cracks, and different treatment methods can be adopted for small cracks with different activity levels to avoid over-repair or under-repair.

[0043] Furthermore, differentiated treatments are adopted according to the different conditions of the cracks, which not only ensures that the cracks are treated promptly and effectively, but also avoids unnecessary repair work, thereby improving the economy and efficiency of the repair work.

[0044] Furthermore, when preventive repair is carried out on small cracks that need to be repaired, it can effectively prevent the small cracks from further expanding, improve the crack resistance of roads and bridges, and extend their service life. At the same time, the operation is relatively simple and the cost is low.

[0045] Furthermore, when performing fine repairs on medium cracks, the cracks can be fully filled, and the density and strength of the crack area can be improved. The fiber-reinforced belt layer further enhances the crack resistance of the structure, effectively repairs medium cracks, and ensures the structural safety of roads and bridges.

[0046] Furthermore, when strengthening and repairing wide cracks, a variety of reinforcement methods are combined to comprehensively enhance the strength and stability of the wide crack area, effectively repair the wide cracks, enable roads and bridges to withstand greater loads, and improve their safety in use.

[0047] Furthermore, ensure that the repair materials are fully solidified under suitable environmental conditions to achieve the best repair effect, avoid damage to the repair area caused by premature opening of traffic, and ensure the safe use of roads and bridges after repair.

[0048] Furthermore, multiple sensors work together to comprehensively and accurately obtain various information about cracks, including surface morphology, depth, width, hidden cracks, etc. At the same time, precise spatial positioning and vibration error compensation ensure the accuracy of the scanning data, providing a reliable basis for subsequent crack classification and repair.

[0049] A road bridge crack repair structure adopts specific repair structures for different types of cracks, which can give full play to the role of various repair materials and structures, effectively repair cracks, and improve the structural safety and durability of roads and bridges.

[0050] Other features and advantages of the present invention will be disclosed in detail in the following specific embodiments and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] The present invention will be further described below with reference to the accompanying drawings:

[0052] Figure 1 This is a process flow chart of a road bridge crack repair process of the present invention;

[0053] Figure 2 This is a process flow chart for the preventive repair of microcracks according to the present invention;

[0054] Figure 3 This is a process flow chart for fine repair of medium cracks according to the present invention;

[0055] Figure 4 This is a process flow chart for the enhanced repair of wide cracks according to the present invention. DETAILED DESCRIPTION

[0056] The following is an explanation and description of the technical solutions of the embodiments of the present invention in conjunction with the drawings of the embodiments of the present invention. However, the following embodiments are only preferred embodiments of the present invention and are not exhaustive. Based on the embodiments in the implementation manner, other embodiments obtained by those skilled in the art without creative work are all within the scope of protection of the present invention.

[0057] In the following description, terms such as "inside", "outside", "up", "down", "left", "right", etc. that indicate directions or positional relationships are only used to facilitate the description of the embodiments and simplify the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction. Therefore, they should not be understood as limiting the present invention.

[0058] like Figures 1 to 4 As shown, the present invention provides a road bridge crack repair process, comprising the following steps:

[0059] S1. Scanning phase: The road surface or bridge deck is scanned through the vehicle-mounted multi-source sensing system. Specifically, the vehicle-mounted multi-source sensing system includes a high-definition linear array camera, an infrared thermal imager, a GPS+RTK locator, and an IMU inertial unit. The high-definition linear array camera has a resolution of 0.05mm and is used to capture the surface morphology of cracks. The laser profiler is used to measure the depth and width of cracks with an accuracy of ±0.02mm. The infrared thermal imager is used to identify hidden cracks and internal voids. The GPS+RTK locator is used for spatial positioning with a spatial positioning accuracy of ≤2cm. The IMU inertial unit is used to compensate for vehicle vibration errors.

[0060] S2. Real-time diagnosis and preliminary classification: The scanning data obtained in step S1 is preprocessed with multi-source data through edge computing equipment, and the crack width is calculated based on the preprocessing results. The cracks are preliminarily classified and marked according to the crack width.

[0061] Specifically, data processing performs width measurement and depth estimation by calculating crack geometric parameters, and performs CAI dynamic evaluation and classification; the edge computing device includes a main processor, a coprocessor, memory, storage, and a sensor interface; in this embodiment, the main processor uses NVIDIA Jetson AGX Orin, the coprocessor uses Intel Movidius Myriad X, the memory uses 32GB LPDDR5, the storage uses 1TB NVMe SSD, and the sensor interface uses GMSL2×8 to connect to the vehicle-mounted multi-source sensing system.

[0062] Among them, the specific algorithm for multi-source data preprocessing is:

[0063] 1. Use CLAHE+Retinex algorithm to eliminate uneven illumination;

[0064] The specific algorithm is:

[0065] def enhance(img):

[0066] lab = cv2.cvtColor(img, cv2.COLOR_BGR2LAB)

[0067] l, a, b = cv2.split(lab)

[0068] clahe = cv2.createCLAHE(clipLimit=3.0, tileGridSize=(8,8))

[0069] l_clahe = clahe.apply(l)

[0070] retinex = cv2.addWeighted(l, 0.5, l_clahe, 0.5, 0)

[0071] return cv2.merge((retinex, a, b));

[0072] 2. Rigid transformation of laser point cloud and image through ICP algorithm:

[0073] The formula is:

[0074] Realize pixel-3D coordinate mapping, positioning error ≤ 0.1mm;

[0075] The width is measured by sampling the point cloud distance along the normal direction.

[0076] The specific algorithm is as follows:

[0077] width = []

[0078] for pt in crack_points:

[0079] normal = compute_normal(pt) # Normal vector calculation

[0080] p1, p2 = find_intersection(normal) # Intersection with the crack edge

[0081] width.append(np.linalg.norm(p1 - p2))

[0082] true_width = np.median(width) * scale_factor;

[0083] Accuracy: ±0.02mm, laser-assisted calibration.

[0084] 3. Depth estimation using thermal imager temperature gradient model

[0085] The formula is:

[0086] Where Ts is the surface temperature, Ta is the ambient temperature, and k is the thermal conductivity of the material;

[0087] The logic of CAI dynamic evaluation and classification decision tree is:

[0088] graph LR

[0089] A[crack width w] -->|w<0.1mm| B[micro cracks - record only]

[0090] A -->|0.1≤w<0.3mm| C[Minor cracks - preventive repair]

[0091] A -->|w≥0.3mm| D[Medium / wide cracks - repair immediately]

[0092] C -->|CAI≤0.15| E[mark observation]

[0093] C -->|CAI>0.15| F[trigger preventive repair];

[0094] CAI calculation core code:

[0095] def compute_CAI(width, delta_w, env):

[0096] # delta_w: expansion rate (mm / day), env: environment parameter object

[0097] k = 0.02 if env.material == 'concrete' else 0.03

[0098] corrosion_factor = np.exp(k * (env.temp + 0.1 * env.chloride))

[0099] CAI = width * delta_w * corrosion_factor

[0100] return CAI;

[0101] S3. Precise repair: Based on the preliminary classification and labeling results of step S2, corresponding repair operations are taken for different types of cracks.

[0102] S4. Quality control: Use edge computing devices to record the crack location coordinates, crack type marking information, and crack repair time information; and after the repair area is opened to traffic, conduct a review and inspection of the repair area to generate a repair quality report.

[0103] Furthermore, in step S2, the specific method of preliminarily classifying and marking the cracks according to the crack width is: when w is less than 0.1 mm, it is marked as a microcrack; when w is greater than or equal to 0.1 mm and less than 0.3 mm, it is marked as a fine crack; when w is greater than or equal to 0.3 mm and less than 0.5 mm, it is marked as a medium crack; when w is greater than or equal to 0.5 mm, it is marked as a wide crack.

[0104] For cracks marked as fine cracks, the crack activity index (CAI) is calculated based on the preprocessing results, and the fine cracks are further classified and marked based on the CAI value: when the CAI is less than or equal to 0.15, it is marked as a fine crack that needs to be observed; when the CAI is greater than 0.15, it is marked as a fine crack that needs to be prevented and repaired.

[0105] According to the above repair process, a road bridge crack repair structure is obtained, including: a small crack repair structure, a medium crack repair structure and a wide crack repair structure; the small crack repair structure includes a micro-crack body, a sealing layer and a surface protection layer; the medium crack repair structure includes a medium crack body, an epoxy resin infusion layer and a fiber reinforced belt layer; the wide crack repair structure includes a wide crack body, a mortar filling layer, a steel anchor layer and a carbon fiber cloth reinforcement layer.

[0106] Among them, the sealing layer uses water-based silane paste, the surface protective layer uses acrylic emulsion protective agent; the epoxy resin infusion layer uses low-viscosity modified epoxy resin, and the fiber reinforced tape layer uses glass fiber mesh tape; the mortar filling layer uses acrylic emulsion mortar, and the carbon fiber cloth reinforcement layer uses carbon fiber cloth and epoxy impregnation glue. The steel bars of the steel anchoring layer need to be treated with rust prevention.

[0107] Cracks marked as micro cracks and small cracks requiring observation are marked for observation; cracks marked as small cracks requiring preventive repair are preventively repaired, and traffic is allowed 24 hours after repair, provided that the ambient temperature is greater than 5°C and the humidity is less than 80%; cracks marked as medium cracks are meticulously repaired, and traffic is allowed 48 hours after repair, provided that the curing temperature is greater than 10°C; cracks marked as wide cracks are intensively repaired, and traffic is allowed 7 days after repair, with the duration extended to 14 days in heavy load areas.

[0108] Example 1: Preventive repair of cracks marked as requiring preventive repair of small cracks includes the following steps:

[0109] Step 1: Surface treatment: clean the dust and oil within 5 cm on both sides of the small cracks.

[0110] Step 2: Glue injection and sealing: inject the sealing layer into the small cracks through a conical nozzle to form a sealing layer.

[0111] Step 3: Seal the surface and apply acrylic emulsion protective agent. Cover the small cracks within 10 cm on both sides of the cracks to form a surface protective layer.

[0112] Specifically, the following are the detection and repair of cracks in the concrete deck of the viaduct:

[0113] S1, scanning phase, the vehicle drives on the road and bridge, and scans the bridge surface through the on-board multi-source sensing system.

[0114] S2, real-time diagnosis, high-definition linear array camera and laser profiler detected a crack 1.2m long and 0.25mm wide. The thermal imager showed a hidden void in the 30°C temperature difference zone below the crack, and it was judged to be a small crack and preventive repair was performed.

[0115] S3, precise repair:

[0116] Step 1: Surface treatment: Use a wire brush and high-pressure air gun to remove dust, oil stains and loose particles within 5 cm on both sides of the micro-crack body to ensure that the crack is exposed and dry.

[0117] Step 2: Glue injection and sealing: Use a handheld glue injection gun and a conical nozzle to slowly squeeze the sealing layer of water-based silane paste along the crack and inject the sealant. Use capillary action to penetrate naturally, and scrape off the excess material on the surface to avoid forming a film layer that hinders penetration.

[0118] Step 3: Surface sealing: Use a roller to evenly apply one coat of acrylic emulsion protective agent to the surface, covering a 10cm area on both sides of the crack to form a flexible waterproof membrane. The flexible waterproof membrane serves as the surface protective layer. Temperature: 35°C, humidity: 70%. Traffic can be reopened 24 hours after repair.

[0119] S4, quality control, the edge computing device records the crack coordinates, crack type, and crack repair time, and generates a repair quality report after re-inspection after the road is opened to traffic for timely re-inspection.

[0120] Example 2: When performing fine repair on a crack marked as a medium crack, the following steps are included.

[0121] Step 1: Grooving: Open a U-shaped groove along the middle crack, remove the debris from the U-shaped groove and wipe it with acetone.

[0122] Step 2: bury the glue injection nozzles, and evenly bury multiple glue injection pumps in the U-shaped groove. Aim the glue injection nozzles of the glue injection pumps at the middle crack, and seal the surfaces of the U-shaped groove and the middle crack with sealing glue.

[0123] Step 3: Pressure injection: start injecting the epoxy resin in the injection pump from the lowest injection nozzle, and stop injecting when the adjacent injection nozzle overflows, thus forming an epoxy resin injection layer.

[0124] Step 4: Reinforcement treatment: After the epoxy resin infusion layer is cured, remove the sealant, apply epoxy base liquid in the U-shaped groove, embed the glass fiber mesh tape and scrape it flat to form a fiber reinforced tape layer.

[0125] Specifically, the following are the crack repair and reinforcement of T-beam webs on heavy-duty highways:

[0126] S1, scanning phase, the vehicle drives on the road and bridge, and scans the bridge surface through the on-board multi-source sensing system.

[0127] S2, real-time diagnosis, high-definition line array camera and laser profilometer detected a crack 3.2m long, 0.4mm wide, and 12cm deep. Load conditions, an average of 5,000 heavy trucks pass through daily. The repair goal is to restore structural integrity and resist fatigue stress.

[0128] S3, precise repair:

[0129] Step 1: Grooving: Use an angle grinder and a U-shaped saw blade to cut a U-shaped groove along the crack, remove debris from the groove and wipe it with acetone.

[0130] Step 2: Bury the glue injection nozzle, align the glue injection nozzle with the crack position and fix it, seal the groove and the crack surface with sealing glue, and set the plastic glue injection nozzle at a distance of 30cm.

[0131] Step 3: Pressure injection: Use a manual hydraulic injection pump to inject the low-viscosity modified epoxy resin of the epoxy resin injection layer from the lowest injection nozzle, and seal it after the adjacent nozzle overflows. The injection pressure for repairing the middle crack should not exceed 0.8MPa to prevent cracking.

[0132] Step 4: Strengthening treatment: remove the sealing glue 24 hours after injection, apply epoxy base liquid in the groove, embed fiber tape and scrape it flat. The curing temperature is >10℃, and it is opened to traffic after 48 hours of maintenance.

[0133] S4, quality control, the edge computing device records the crack coordinates, crack type, and crack repair time, and generates a repair quality report after re-inspection after the road is opened to traffic for timely re-inspection.

[0134] Example 3: When performing enhanced repair on a crack marked as a wide crack, the following steps are included:

[0135] Step 1: Chisel out and plant reinforcement. Chisel out the loose concrete on both sides of the wide crack to a solid layer. Open multiple installation holes perpendicular to the wide crack along its crack trajectory. Plant threaded steel bars in the holes and inject epoxy rebar glue to form a steel bar anchoring layer.

[0136] Step 2: Mortar filling, inject mortar into wide cracks, compact the mortar layer by layer to form a mortar filling layer.

[0137] Step 3: Carbon fiber cloth reinforcement: Apply epoxy impregnation glue within a range of more than 20 cm on both sides of the wide crack, and stick carbon fiber cloth across the wide crack in the form of a U-shaped hoop to form a carbon fiber cloth reinforcement layer.

[0138] Specifically, the following are the repair and reinforcement of vertical cracks in bridge piers in the northern freeze-thaw zone:

[0139] S1, scanning phase, the vehicle drives on the road and scans the bridge piers through the on-board multi-source sensing system.

[0140] S2, real-time diagnosis, high-definition linear array camera and laser profiler detected a crack 1.2mm wide and 40cm deep. Environment, 50 freeze-thaw cycles per year. Repair target, structural reinforcement, resistance to frost heave forces.

[0141] S3, precise repair:

[0142] Step 1: Chisel out and plant rebar. Use an electric hammer and a rebar locator to chisel out the loose concrete on both sides of the crack with a width of 25 cm and a depth of 8 cm until the solid layer is reached. Drill holes perpendicular to the crack direction and plant threaded rebar. The rebar planting parameters are Φ12mm HRB400 rebar, a hole depth of 15 cm, and epoxy rebar glue for anchoring. The rebar spacing is 20 cm horizontally and 30 cm vertically.

[0143] Step 2: Fill with high-strength mortar, spray water to moisten the base surface, fill in layers with polymer-modified repair mortar and compact it. Acrylic emulsion mortar (mixing ratio: P·O42.5 cement: medium sand: acrylic emulsion: water = 1:2:0.3:0.15), compressive strength 55MPa, anti-freeze grade F200, finally smooth the surface, control the thickness, single layer ≤3cm.

[0144] Step 3: Reinforce with carbon fiber cloth, apply epoxy impregnation glue on the crack area, the width is greater than 20cm on both sides of the crack, paste carbon fiber cloth, paste 3 layers of 30cm width in the circumferential direction, overlap length 15cm, paste across the crack in the form of U-shaped hoop, roll to remove bubbles, and seal with surface glue; before planting reinforcement for wide crack repair, steel bar anti-rust treatment is required, and traffic is opened after 7 days of maintenance, and heavy loads require 14 days.

[0145] S4, quality control, the edge computing device records the crack coordinates, crack type, and crack repair time, and generates a repair quality report after re-inspection after the road is opened to traffic for timely re-inspection.

[0146] The above are only specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Those skilled in the art should understand that the present invention includes but is not limited to the contents described in the drawings and the above specific embodiments. Any modifications that do not deviate from the functional and structural principles of the present invention are intended to be included within the scope of the claims.

Claims

1. A road bridge crack repair process, characterized in that: The following steps are involved: S1, scanning stage: Scan the road or bridge surface through the vehicle-mounted multi-source sensing system; S2. Real-time diagnosis and preliminary classification: The scan data obtained in step S1 is preprocessed using an edge computing device, and the crack width is calculated based on the preprocessing results. The cracks are then preliminarily classified and marked according to the crack width. S3. Precise repair: Based on the preliminary classification and labeling results of step S2, corresponding repair operations are taken for different types of cracks; S4. Quality control: Use edge computing devices to record crack location coordinates, crack type marking information, and crack repair time information; After the repair area is opened to traffic, the repair area will be reviewed and inspected, and a repair quality report will be generated.

2. A road bridge crack repair process according to claim 1, characterized in that: In step S2, the specific method of preliminarily classifying and marking the cracks according to their width is as follows: When w is less than 0.1 mm, it is marked as microcracks; When w is greater than or equal to 0.1 mm and less than 0.3 mm, it is marked as a fine crack; When w is greater than or equal to 0.3 mm and less than 0.5 mm, it is marked as a medium crack; When w is greater than or equal to 0.5 mm, it is marked as a wide crack.

3. A road bridge crack repair process according to claim 2, characterized in that: In step S2, for cracks marked as fine cracks, the crack activity index (CAI) is calculated based on the preprocessing results, and the fine cracks are further classified and marked based on the CAI value: When CAI is less than or equal to 0.15, it is marked as a small crack that needs to be observed; When CAI is greater than 0.15, it is marked as requiring preventive repair of fine cracks.

4. A road bridge crack repair process according to claim 3, characterized in that: Mark and observe the cracks marked as micro cracks and small cracks that need to be observed; Carry out preventive repairs on cracks marked as requiring preventive repair of minor cracks; Perform detailed repairs on cracks marked as medium cracks; Perform intensive repairs on cracks marked as wide cracks.

5. A road bridge crack repair process according to claim 4, characterized in that: Preventive repair of cracks marked as requiring preventive repair of hairline cracks involves the following steps: Step 1: Surface treatment: clean the dust and oil within 5cm on both sides of the small cracks; Step 2: Glue injection and sealing: inject penetrating sealant into small cracks through a conical nozzle to form a sealing layer; Step 3: Sealing the surface, applying acrylic emulsion protective agent, the acrylic emulsion protective agent covers the small cracks to within 10 cm on both sides thereof, forming a surface protective layer.

6. A road bridge crack repair process according to claim 4, characterized in that: The detailed repair of a crack marked as a medium crack involves the following steps: Step 1: Grooving: Create a U-shaped groove along the middle crack, remove debris from the U-shaped groove and wipe it with acetone; Step 2: bury the glue injection nozzles, and evenly bury multiple glue injection pumps in the U-shaped groove, aligning the glue injection nozzles of the glue injection pumps with the middle crack, and sealing the surfaces of the U-shaped groove and the middle crack with the sealing glue; Step 3: Pressure injection: inject the epoxy resin in the injection pump from the lowest injection nozzle, and stop injecting when the adjacent injection nozzle overflows, thus forming an epoxy resin injection layer; Step 4: Reinforcement treatment: After the epoxy resin infusion layer is cured, remove the sealant, apply epoxy base liquid in the U-shaped groove, embed the glass fiber mesh tape and scrape it flat to form a fiber reinforced tape layer.

7. A road bridge crack repair process according to claim 4, characterized in that: When performing an intensive repair on a crack marked as a wide crack, the following steps are involved: Step 1: Chisel out and plant reinforcement. Chisel out the loose concrete on both sides of the wide crack to a solid layer. Drill multiple installation holes perpendicular to the wide crack along its crack trajectory. Plant threaded steel bars in the holes and inject epoxy rebar glue to form a steel bar anchoring layer. Step 2: Mortar filling: inject mortar into the wide cracks and compact the mortar layer by layer to form a mortar filling layer; Step 3: Carbon fiber cloth reinforcement: Apply epoxy impregnation glue within a range of more than 20 cm on both sides of the wide crack, and stick carbon fiber cloth across the wide crack in the form of a U-shaped hoop to form a carbon fiber cloth reinforcement layer.

8. A road bridge crack repair process according to claim 4, characterized in that: Cracks marked as requiring preventive repair: Traffic can be opened 24 hours after repair, and the ambient temperature must be greater than 5°C and the humidity must be less than 80%; Cracks marked as medium cracks: Traffic can be opened 48 hours after repair, and the curing temperature must be greater than 10°C; Cracks marked as wide cracks: Open to traffic 7 days after repair, extended to 14 days in heavily loaded areas.

9. A road bridge crack repair process according to claim 1, characterized in that: In step S1: the vehicle-mounted multi-source sensing system includes: High-definition line array camera to capture the crack surface morphology; Laser profilometer, used to measure crack depth and width; Infrared thermal imager, used to identify hidden cracks and internal voids; GPS+RTK locator and IMU inertial unit are used for spatial positioning and compensation of vehicle vibration errors.

10. A road bridge crack repair structure, characterized in that: include: Small crack repair structure, medium crack repair structure and wide crack repair structure; The fine crack repair structure includes a micro-crack body, a sealing layer and a surface protection layer; The medium crack repair structure includes a medium crack body, an epoxy resin infusion layer and a fiber reinforced tape layer; The wide crack repair structure comprises a wide crack body, a mortar filling layer, a steel bar anchoring layer and a carbon fiber cloth reinforcement layer.

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