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CN-122013631-A - Asphalt pavement crack repairing method based on multi-stage stress guiding

CN122013631ACN 122013631 ACN122013631 ACN 122013631ACN-122013631-A

Abstract

The invention relates to the technical field of asphalt pavement repair, in particular to a multi-stage stress guiding-based asphalt pavement crack repair method, which comprises the steps of cleaning the surface of a crack, removing moisture in the deep part of the crack by using a hot air spray gun, heating to a preheating temperature, extracting the average width W of the crack by using a three-dimensional point cloud of a collected crack area, outputting an outlet temperature, viscosity and component addition instruction of a repair material according to the width W and the environment temperature, adjusting thermoplastic polymer modified asphalt to a determined target temperature and viscosity, executing an injection action according to a crack grading result, starting a sectional type infrared heating array, constructing a transverse temperature difference field, and compacting the repair area by using the thermal expansion difference of the pavement material when the temperature is reduced to a compaction window threshold value.

Inventors

  • JIN JIANMIAO
  • YANG JIANFEI
  • SUN WEIBIN
  • WANG XIAJUAN
  • XU YUNFEI

Assignees

  • 嘉兴市金程建设工程有限公司

Dates

Publication Date
20260512
Application Date
20251231

Claims (10)

  1. 1. The asphalt pavement crack repairing method based on multi-stage stress guiding is characterized by comprising the following steps of: s1, cleaning and thermally activating cracks, namely cleaning the surfaces of the cracks, then spraying high-temperature air flow into the cracks by using a hot air spray gun, removing deep moisture and heating the wall surfaces of the cracks to a preheating temperature; s2, crack detection and quantification, namely acquiring three-dimensional point cloud of a crack region by using laser scanning equipment, and extracting average width W of the crack in millimeter as a control reference; s3, material state matching and resolving, wherein the processor retrieves a preset process database according to the width W and the ambient temperature and outputs a target outlet temperature, target viscosity and component adding instruction of the repairing material; s4, temperature and viscosity adjustment and differential injection, namely controlling a cyclic shearing loop to adjust the thermoplastic polymer modified asphalt to the target temperature and viscosity determined in the step S3, and selecting a needle nozzle or a dragging launder to execute injection action according to a crack grading result; s5, guiding and closing the gradient thermal field, namely starting a sectional type infrared heating array, controlling the radiation power of the areas at two sides of the crack to be higher than that of the central area, constructing a transverse temperature difference field, and inducing the crack wall surface to generate centripetal displacement by utilizing the thermal expansion difference of the pavement material; S6, monitoring and compacting, namely monitoring the surface temperature of the repair material, and when the temperature is reduced to a compaction window threshold value, operating the vibration compacting equipment to compact the repair area.
  2. 2. The multi-stage stress guiding-based asphalt pavement crack repairing method according to claim 1, wherein the specific operation parameters of the hot air spray gun in the step S1 are as follows: the mixing ratio of the fuel gas and the air of the spray gun is regulated to ensure that the central temperature of the outlet of the spray nozzle is between 350 ℃ and 500 ℃ and the air flow speed is controlled ; The nozzle is controlled to move along the axis of the crack at a speed of 3-5m/min, so that the measured temperature of the surface layer of the inner wall of the crack is raised to 40-60 ℃.
  3. 3. The multi-stage stress-induced asphalt pavement crack repair method according to claim 2, wherein the matching calculation logic and component instructions in step S3 comprise: If W is more than or equal to 2 and less than 10mm, outputting a permeation type instruction, namely setting a target outlet temperature Target viscosity The material is pure SBS modified asphalt; if W is more than or equal to 10 and less than or equal to 30mm, outputting a filling instruction, namely setting a target outlet temperature Target viscosity Adding 2% -4% of polyester fiber into the material; if W is more than 30mm, outputting a supporting instruction, namely setting target outlet temperature Target viscosity 15-20% Of preheated fine aggregate by mass percent is added into the material.
  4. 4. The multi-stage stress-guided asphalt pavement crack repairing method according to claim 3, wherein the injection process for the first-stage crack in step S4 is as follows: Selecting a needle type grouting nozzle with the outlet aperture of 1.5-3.0 mm; Inserting the nozzle into the depth of 5-10mm below the plane of the crack opening; The output pressure of the grouting pump is controlled to be constant within the range of 0.15-0.25MPa, so that the material is in a jet flow shape to fill the deep space of the crack.
  5. 5. The multi-stage stress-guided asphalt pavement crack repairing method according to claim 4, wherein the injection process for the class II and above cracks in step S4 is as follows: a dragging type launder with the bottom opening width of 30-50mm is selected; Controlling the output pressure of the grouting pump to be less than 0.05MPa, and adjusting a flow valve to keep the injection flow rate at 10 < -1 > L/min; The scraping plate at the bottom of the flow groove is controlled to keep a vertical distance of 2-3mm from the road surface, and the scraping plate moves along with the flow groove to form a coating layer on the top of the crack by scraping.
  6. 6. The multi-stage stress-induced asphalt pavement crack repair method according to claim 5, wherein the structural layout of the segmented infrared heating array in step S5 is as follows: The array comprises a central heating area and lateral driving areas, wherein the central heating area is arranged along the crack trend, and the lateral driving areas are symmetrically distributed on two sides of the central heating area; The inner edge of the lateral driving area is 50mm away from the center line of the crack, and the outer edge is 150mm away from the center line of the crack; the central heating zone covers a range of about 50mm each of the fracture centerlines.
  7. 7. The multi-stage stress-guided asphalt pavement crack repair method according to claim 6, wherein the construction parameters of the transverse temperature difference field in step S5 are as follows: adjusting the power supply voltage of the heating unit of the lateral driving area to ensure that the radiation power density reaches The corresponding road surface steady-state temperature is ; Adjusting the power supply voltage of the central heating zone heating unit to make the radiation power density of the central heating zone heating unit be The corresponding road surface steady-state temperature is ; Maintaining temperature differential between lateral drive zone and central heating zone The duration of heating is 60-90 seconds.
  8. 8. The multi-stage stress-induced asphalt pavement crack repair method of claim 7, wherein step S5 further comprises low temperature environment compensation logic: The temperature sensor collects the ambient air temperature ; When (when) When the processor automatically executes the compensation action: reducing the moving speed of the hot air spray gun in the step S1 to ; The heating duration of the lateral drive zone in step S5 is extended by 20-30 seconds.
  9. 9. The multi-stage stress-induced asphalt pavement crack repair method according to claim 8, wherein step S5 further comprises a closed-loop control action based on displacement feedback: The laser displacement sensor reads the relative coordinate changes of the road surfaces at two sides of the crack in real time, and calculates the relative displacement rate V in unit time; if V is lower than the preset minimum closing rate, the processor outputs an instruction to increase the duty ratio of the heating unit of the lateral driving area; if V is zero or the vertical height of the crack closing position is detected to be increased, the processor cuts off the power supply of the heating array.
  10. 10. The multi-stage stress-induced asphalt pavement crack repair method of claim 9, wherein the compaction operating parameters in step S6 are: When the infrared temperature sensor reading is at When the vibrating plate compactor or the rubber wheel road roller is started; And controlling the vibration frequency of the compaction equipment to be 20-30Hz, and carrying out reciprocating compaction for 2-3 times along the repairing area until the height difference between the surface of the repairing area and the original pavement is less than 1mm.

Description

Asphalt pavement crack repairing method based on multi-stage stress guiding Technical Field The invention relates to the technical field of asphalt pavement repair, in particular to an asphalt pavement crack repair method based on multi-stage stress guiding. Background Asphalt pavement is used as one of the main forms of highway traffic, and cracks are easily generated due to factors such as load action, temperature change, aging and the like in the long-term use process. If the cracks are not repaired in time, the cracks can be further expanded, so that the pavement structure is damaged, water seepage and erosion of a base layer are caused, even more serious pavement diseases are caused, and the driving safety and the service life of the pavement are influenced. At present, the asphalt pavement crack repairing technology has become an important research direction in the field of highway maintenance, and various repairing methods have emerged in the prior art, mainly comprising the processes of grooving cleaning, material filling, surface sealing and the like. Publication No. CN101676492A discloses a method for repairing asphalt pavement cracks, which comprises the steps of grooving, cleaning the grooves, filling a repairing material (such as asphalt mixture) and compacting. Specifically, the technology performs crack propagation treatment by setting the size of a groove, then removes slag and dust in the groove, finally injects a repairing material and compacts the repairing material so as to fill cracks and flatten the road surface. The method is simple to operate and suitable for repairing medium cracks, but mainly depends on mechanical filling and compaction, and omits thermal activation of crack wall surfaces and dynamic matching of material viscosity, so that the interface bonding strength is low, secondary cracking is easy to occur under the effect of temperature circulation, and the repairing efficiency is greatly influenced by environmental factors. Publication number CN1629405A discloses a method for repairing a crack in an asphalt pavement, which involves cleaning the crack face, pouring with asphalt cement or attaching a sealing tape, and brushing an asphalt restoration agent to enhance surface protection. Specific processes include dust removal, asphalt mastic filling, and application of a healing agent coating to improve crack water resistance and durability. The technology emphasizes the effect of the chemical restoration agent, and can restore the adhesive property of asphalt to a certain extent, the method lacks quantitative detection of crack morphology and accurate control of material state, only adopts a single filling mode, cannot adapt to the differentiation requirements of cracks with different widths, and the repaired pavement is easy to lose efficacy due to expansion caused by heat and contraction caused by cold. Disclosure of Invention Therefore, the invention aims to provide a multi-stage stress guiding-based asphalt pavement crack repairing method. The method solves the problems of weak interface bonding, poor adaptability and insufficient durability in the prior art, and realizes efficient, intelligent and durable crack repair. In order to achieve the above purpose, the present invention provides the following technical solutions: a multi-stage stress guiding-based asphalt pavement crack repairing method comprises the following steps: s1, cleaning and thermally activating cracks, namely cleaning the surfaces of the cracks, then spraying high-temperature air flow into the cracks by using a hot air spray gun, removing deep moisture and heating the wall surfaces of the cracks to a preheating temperature; s2, crack detection and quantification, namely acquiring three-dimensional point cloud of a crack region by using laser scanning equipment, and extracting average width W of the crack in millimeter as a control reference; s3, material state matching and resolving, wherein the processor retrieves a preset process database according to the width W and the ambient temperature and outputs a target outlet temperature, target viscosity and component adding instruction of the repairing material; s4, temperature and viscosity adjustment and differential injection, namely controlling a cyclic shearing loop to adjust the thermoplastic polymer modified asphalt to the target temperature and viscosity determined in the step S3, and selecting a needle nozzle or a dragging launder to execute injection action according to a crack grading result; s5, guiding and closing the gradient thermal field, namely starting a sectional type infrared heating array, controlling the radiation power of the areas at two sides of the crack to be higher than that of the central area, constructing a transverse temperature difference field, and inducing the crack wall surface to generate centripetal displacement by utilizing the thermal expansion difference of the pavement material; S6, monitoring and compacting, name