A precise positioning and grouting method based on asphalt pavement base disease treatment

Abstract

The present invention relates to the field of road engineering technology, and in particular to a precise positioning and grouting method for treating asphalt pavement base defects, comprising the following steps: S01: inspecting the pavement to obtain a pavement profile image; S02: setting a survey line for cracks in the pavement base; S03: using a radar data acquisition system to conduct inspections along the survey line to obtain a radar image of the pavement structure; S04: formulating a defect treatment plan based on the pavement structure radar image obtained in step S03, setting grouting hole positions, and drilling holes using a drill rig; S05: grouting repair, using a radar data acquisition system to repeat inspections along the survey line until grouting is completed. The present invention performs precise inspections of cracks by setting appropriate survey lines, ensuring the rationality of the distribution of grouting holes and improving the grouting effect. At the same time, the "deep hole + shallow hole" design is utilized to enable the slurry to better treat base defects, improve the flow uniformity of the grouting liquid, and increase the grouting fullness.

Description

Technical Field

[0001] The present invention relates to the technical field of road engineering, and in particular to a precise positioning and grouting method based on asphalt pavement base disease treatment. Background Art

[0002] Semi-rigid asphalt pavements are a common structure used on my country's high-grade highways. These pavements offer a certain degree of slab-like stability. However, they also have inherent drawbacks. They are susceptible to cracking due to environmental factors such as dry-wet, freeze-thaw cycles, and repeated loading. These cracks not only reduce the road quality of vehicles but also undermine the integrity and continuity of the pavement structure, weakening its structural strength to a certain extent. In the process of determining maintenance plans and evaluating performance on an increasing number of highways, data on hidden pavement structural defects is needed, including cracks, looseness, and voids within the asphalt surface layer, as well as cracking in the base layer.

[0003] Currently, polymer grouting is the primary treatment method for base layer defects. This involves drilling holes in the road and injecting grouting materials, such as polymers, into the semi-rigid base using a grouting machine to reinforce the semi-rigid base. Using polymer grouting to fill voids in the structural layers and consolidate loose materials between layers is of great practical significance for restoring the integrity of the pavement structure, improving road service levels, and reducing the impact of maintenance and construction on public transportation. However, cracks in semi-rigid base asphalt pavements vary in morphology, are relatively small in width, have large peripheral porosity, and exhibit a high degree of discreteness due to poor interlayer quality and looseness. Therefore, ensuring the fullness of the grouting is a crucial indicator for improving the quality of pavement repairs.

[0004] The information disclosed in this background technology section is only intended to deepen the understanding of the overall background technology of the present invention and should not be regarded as an admission or any form of suggestion that the information constitutes the prior art known to those skilled in the art. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a precise positioning and grouting method based on the treatment of asphalt pavement base diseases, which can accurately set grouting holes on cracks and surrounding grouting channels to improve the grouting fullness.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] A precise positioning and grouting method for treating asphalt pavement base layer diseases includes the following steps:

[0008] S01: Use a ground penetrating radar vehicle to detect the road surface and obtain a road surface profile image;

[0009] S02: For cracks in the pavement base, set up a measuring line at the location where the cracks occur;

[0010] S03: Use the radar data acquisition system to conduct detection along the survey line to obtain a radar image of the road surface structure;

[0011] S04: formulating a disease treatment plan based on the pavement structure radar image obtained in step S03, setting grouting hole positions according to the disease treatment plan, and drilling holes using a drill to obtain grouting holes;

[0012] S05: Perform grouting repair. During the repair process, the radar data acquisition system is used to repeatedly detect along the survey line until the radar image changes and shows that the grouting is completed.

[0013] Furthermore, in step S01, the ground penetrating radar vehicle travels at a speed of 85 to 95 km / h, or 23.6 to 26.4 m / s. Through rough detection, the crack extension status of the road base layer is obtained, and in subsequent steps, the radar data acquisition system can be improved by accurately setting the measurement line.

[0014] Furthermore, in step S02, the coordinates of the bottom of the crack are taken as the origin, the driving direction is taken as the X axis, the road width is taken as the Y axis, and the road height is taken as the Z axis to establish the coordinate axis, and the crack is marked. The coordinates of the end of the crack are marked as (x b ,y b , z b );

[0015] Then when |y b |>|x b |, if the crack penetrates the wheel track, the intersection coordinates of the crack and the wheel track are (x1, y1, z1), and the extended point of the intersection coordinates in the surface layer is used as the measuring point to set the measuring line, and the measuring line extends to both ends along the X axis at the measuring point; if the crack does not extend to the wheel track, the coordinates on the side of the crack closest to the wheel track (x2, z2) Set a measuring line at the extension point of the surface layer as the measuring point, and extend the measuring line to both ends along the X axis at the measuring point;

[0016] When |y b |≤|x b When measuring cracks, set at least two measuring points along the length of the crack. The measuring lines extend from the measuring points along the Y-axis toward both ends, with the distance between two adjacent measuring lines being no less than 3 meters. This ensures the accuracy of the measuring line establishment and improves the accuracy of the radar data acquisition system.

[0017] Furthermore, the distance between the two ends of the survey line and the measuring point is 0.8 to 1.2 meters, ensuring full coverage of the crack extension location. At the same time, the internal conditions of the intact road surface at both ends of the survey line are compared with those at the cracks to better highlight the radar image of the crack damage and improve the repair contrast.

[0018] Furthermore, in step S02, the selected measuring points are marked by spray painting.

[0019] Furthermore, in step S03, a shielded antenna is used to avoid noise interference caused by the large opening of the horn antenna during the detection process, and a 3D ground penetrating radar of 800 to 900 MHz is used for data acquisition. The detection frequency has a great influence on the detection effect. The higher the frequency, the higher the detection accuracy, but the detection depth is smaller; the lower the frequency, the deeper the detection depth. Since the diseases treated by grouting of internal road diseases mainly exist in the base layer, a low measurement frequency is required to accurately detect the grouting diffusion path. The preferred frequency is 900 MHz. The speed of the 3D ground penetrating radar is ≤5 m / s. At this speed, the ground penetrating radar can better observe the grouting diffusion path.

[0020] The present invention uses a radar data acquisition system to acquire a radar image of a pavement base layer. Based on preset rules, the damage type and location of the base layer defects in the radar image of the pavement base layer are determined. Defect types include crack-type defects, interlayer defects, and loose defects. If a bright parabola or a small range of bright event axes are present in a vertical slice of the internal radar image of the pavement, the defect type is determined to be an interlayer defect. If multiple holes appear in the surface layer, base layer, or subbase layer in the internal radar image of the pavement, the defect type is determined to be a loose defect. If cracks are present in the cross-section of the internal radar image of the pavement, the defect type is determined to be a crack-type defect. A grouting construction plan is determined based on the crack damage type, and grouting is then performed at the location of the base layer defect according to the grouting construction plan.

[0021] Furthermore, specifically in step S04, the following different grouting holes are set according to the type of crack damage:

[0022] When the damage type is a crack-type damage and the crack is a single crack, an L-shaped hole arrangement method is adopted, and the distance between two adjacent grouting holes is 35 cm; the direction of the grouting holes is based on the ground penetrating radar detection results. When the base layer cracks and the surface layer cracks are not perpendicular, in order to better treat the pavement base layer cracks, the holes are arranged according to the direction of the base layer cracks; the L-shaped hole arrangement method adopted by the present invention can not only fill the cracks themselves, but also repair the hollow and loose diseases that have appeared around the cracks.

[0023] When the damage type is crack-type damage, the Z-shaped hole arrangement method is adopted, the distance between two adjacent grouting holes is 50 cm, and exhaust holes are set in the centers of three adjacent grouting holes; the grouting holes are arranged in a Z-shaped manner on both sides of the crack, which can not only fill the crack itself, but also repair the hollow and loose diseases around the crack.

[0024] When the damage type is interlayer poor type and loose type, the plum blossom pile hole layout method is adopted, with the distance between two adjacent grouting holes being 1m, and vent holes set in the center of four adjacent grouting holes. The layout of the vent holes can better drain the slurry and improve the grouting effect.

[0025] Furthermore, the grouting holes adopt a combination of "deep hole + shallow hole + deep hole + shallow hole". The deep hole is drilled to the top of the lower base of the pavement structure, and the shallow hole is drilled to the top of the upper base. The deep holes and shallow holes are set at intervals.

[0026] Furthermore, the grouting order of the grouting holes is from deep holes to shallow holes, from grouting holes with lower terrain to grouting holes with higher terrain, and from grouting holes on the outermost side of the road to grouting holes on the inner side of the road. After grouting of each hole is completed, it is sealed with sealing tools such as corks.

[0027] Furthermore, in step S05, the proportion of the filling distance in the detection width is determined according to the scale in the radar image, and the grouting diffusion distance is determined according to the proportion.

[0028] Furthermore, in step S05, data is collected using a shielded antenna and a 3D ground-penetrating radar operating at 800-900 MHz, with a speed of ≤5 m / s. This step uses the radar data acquisition system to perform measurements along the survey line identified in step S01, within the same measurement area, at the same frequency and speed as in step S02. This ensures the stability of the grouting effect and improves grouting fullness.

[0029] The beneficial effects of the present invention are:

[0030] (1) The present invention precisely sets the survey line and uses the radar data acquisition system to perform detailed crack detection, obtains comprehensive information on cracks within the pavement, and sets a treatment plan. The present invention accurately locates the disease and adopts different grouting construction plans to improve the effect of disease treatment; ensures the rationality of the distribution of grouting holes, and improves the grouting effect. It improves the efficiency of disease treatment. Compared with the existing technology, the present invention avoids drilling core samples and then making judgments on the pavement, reduces damage to the pavement, and saves a lot of manpower and material resources.

[0031] (2) When conventional grouting holes of equal depth are used, the grouting liquid easily overflows between adjacent grouting holes due to the connection between adjacent grouting holes and the interlayers during the actual grouting process, and each grouting position cannot be filled well. However, the present invention adopts a "deep hole + shallow hole" drilling method, so that the deep holes and shallow holes are staggered. The grouting liquid has a better flow uniformity due to the drainage effect of the air in the shallow holes. Compared with the existing technology, the present invention can well fill the grouting liquid in cracks, interlayer defects and loose areas, thereby improving the grouting fullness. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0033] Figure 1 Schematic diagram of the structure of a method for monitoring the fullness of polymer grouting according to an embodiment of the present invention;

[0034] Figure 2 Schematic diagram of changes in the radar data acquisition system during the grouting process in an embodiment of the present invention;

[0035] Figure 3 Schematic diagram of the setting of the transverse crack detection line in an embodiment of the present invention;

[0036] Figure 4 Schematic diagram of the arrangement of a longitudinal crack measuring line in an embodiment of the present invention;

[0037] Figure 5 Schematic diagram of an L-shaped hole arrangement in an embodiment of the present invention;

[0038] Figure 6 Schematic diagram of the Z-shaped hole arrangement in an embodiment of the present invention;

[0039] Figure 7 Schematic diagram of the plum blossom pile type hole arrangement method in an embodiment of the present invention.

[0040] Figure numerals: 01, crack; 02, grouting hole; 03, deep hole; 04, shallow hole; 05, vent; 06, slurry diffusion range. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0042] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly attached to the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used in this specification are for the purpose of describing specific embodiments only and are not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0044] like Figures 1 to 7 The illustrated method for precise positioning and grouting of asphalt pavement base layer defects includes the following steps:

[0045] S01: Use a ground penetrating radar vehicle to detect the road surface and obtain a road surface profile image;

[0046] The ground penetrating radar vehicle travels at a speed of 90 km / h in this step. The present invention obtains the crack extension status of the road base through rough detection, and then in subsequent steps, the radar data acquisition system can be improved by accurately setting the measurement line.

[0047] S02: For cracks in the pavement base, set up measurement lines at the locations where the cracks occur; the selected measurement points are marked by spray paint.

[0048] Specifically, the coordinates of the bottom of the crack are taken as the origin, the driving direction is taken as the X axis, the road width is taken as the Y axis, and the road height is taken as the Z axis to establish the coordinate axis, and the crack is marked. The coordinates of the end of the crack are marked as (x b ,y b , z b );

[0049] Then when |y b |>|x b |, if the crack penetrates the wheel track, the intersection coordinates of the crack and the wheel track are (x1, y1, z1), and the measuring line is set with the extension point of the intersection coordinates on the surface layer as the measuring point. The extension point of the intersection coordinates on the surface layer is a vertical line drawn along the Z axis from the intersection coordinates, extending to the intersection point of the surface layer. The measuring line is extended along the X axis to both ends at the measuring point; if the crack does not extend to the wheel track, the coordinates on the side of the crack closest to the wheel track (x2, z2) Set a measuring line at the extension point of the surface layer as the measuring point, and extend the measuring line to both ends along the X axis at the measuring point;

[0050] When |y b |≤|x b When measuring cracks, set at least two measuring points along the length of the crack. The measuring lines extend from the measuring points along the Y-axis toward both ends, with the distance between two adjacent measuring lines being no less than 3 meters. This ensures the accuracy of the measuring line establishment and improves the effectiveness of the radar data acquisition system.

[0051] Preferably, the distance between the two ends of the survey line and the measuring point is 0.8 to 1.2 meters, ensuring full coverage of the crack extension location. At the same time, by comparing the intact road surface at both ends of the survey line with the internal conditions of the crack, the radar image of the crack disease is better highlighted, thereby improving the repair contrast.

[0052] S03: Use the radar data acquisition system to conduct detection along the survey line to obtain a radar image of the road surface structure;

[0053] Specifically, in this embodiment, a shielded antenna was used to avoid noise interference during the detection process caused by the larger opening of a horn antenna. A 900MHz 3D ground-penetrating radar was used for data acquisition at a speed of 5m / s. At this speed, the radar can better observe the grouting diffusion path.

[0054] The present invention uses a radar data acquisition system to acquire a radar image of a pavement base layer. Based on preset rules, the damage type and location of the base layer defects in the radar image of the pavement base layer are determined. Defect types include crack-type defects, interlayer defects, and loose defects. If a bright parabola or a small range of bright event axes are present in a vertical slice of the internal radar image of the pavement, the defect type is determined to be an interlayer defect. If multiple holes appear in the surface layer, base layer, or subbase layer in the internal radar image of the pavement, the defect type is determined to be a loose defect. If cracks are present in the cross-section of the internal radar image of the pavement, the defect type is determined to be a crack-type defect. A grouting construction plan is determined based on the crack damage type, and grouting is then performed at the location of the base layer defect according to the grouting construction plan.

[0055] S04: formulating a disease treatment plan based on the pavement structure radar image obtained in step S03, setting grouting hole positions according to the disease treatment plan, and drilling holes using a drill to obtain grouting holes;

[0056] Furthermore, specifically in step S04, the following different grouting holes are set according to the type of crack damage:

[0057] like Figure 5 As shown in the figure, when the damage type is a crack-type damage and the crack is a single crack, an L-shaped hole arrangement method is adopted, and the distance between two adjacent grouting holes is 35 cm; the direction of the grouting holes is based on the ground penetrating radar detection results. When the base layer cracks are not perpendicular to the surface layer cracks, in order to better treat the pavement base layer cracks, the holes are arranged according to the direction of the base layer cracks; the L-shaped hole arrangement method adopted by the present invention can not only fill the cracks themselves, but also repair the hollow and loose diseases that have appeared around the cracks.

[0058] like Figure 6As shown in the figure, when the damage type is crack-type damage, when the Z-shaped hole arrangement method is adopted, the distance between two adjacent grouting holes is 50 cm, and exhaust holes are set in the centers of three adjacent grouting holes; the grouting holes are arranged in a Z-shaped manner on both sides of the crack, which can not only fill the crack itself, but also repair the hollow and loose diseases around the crack.

[0059] like Figure 7 As shown in the figure, when the damage type is interlayer poor type and loose type, the plum blossom pile hole layout method is adopted, the distance between two adjacent grouting holes is 1m, and the center of the four adjacent grouting holes is set with exhaust holes. The layout of the exhaust holes can better drain the slurry and improve the grouting effect.

[0060] Furthermore, the grouting holes utilize a combination of deep holes + shallow holes + deep holes + shallow holes. The deep holes are drilled to the top of the lower base of the pavement structure, and the shallow holes are drilled to the top of the upper base. The deep and shallow holes are spaced apart. In this embodiment, the deep holes are set to a depth of 0.75m, and the shallow holes are set to a depth of 0.55m.

[0061] like Figures 3-5 As shown, in order to improve the grouting effect, the grouting order of the grouting holes is from deep holes to shallow holes, from grouting holes with lower terrain to grouting holes with higher terrain, and from grouting holes on the outermost side of the road to grouting holes on the inner side of the road. After grouting, each hole is sealed with a sealing tool such as a cork.

[0062] S05: If Figure 2 As shown, grouting repair is carried out. During the repair process, the radar data acquisition system is used to repeat the detection along the survey line. The proportion of the filling distance in the detection width is determined according to the scale in the radar image, and the grouting diffusion distance is determined by the proportion. Until the radar image changes and shows that the grouting is completed. In order to ensure the consistency of data testing, in this step, a shielded antenna is used, and a 900MHz 3D ground penetrating radar is used for data acquisition. The speed of the 3D ground penetrating radar is 5m / s. In this step, along the survey line confirmed in step S02, the radar data acquisition system is used in the same detection area to perform detection at the same frequency and speed as step S03 to ensure the stability of the grouting effect and improve the grouting fullness.

[0063] Furthermore, in steps S02 and S05, a hand-push radar detection system is used, and the radar image detection width is 1.5m.

[0064] This invention uses a radar data acquisition system to precisely detect cracks by setting appropriate survey lines, obtaining comprehensive information about cracks within the pavement and developing treatment plans. By accurately locating the defects and employing different grouting schemes, the invention improves the effectiveness of defect treatment. This ensures a rational distribution of grouting holes, enhancing grouting effectiveness and improving the efficiency of defect treatment. Compared with existing technologies, this invention avoids the need for core drilling and subsequent assessment of the pavement's cracks, reducing damage to the pavement and saving significant manpower and resources.

[0065] Conventional grouting holes of equal depth are often connected to each other during the grouting process, causing slurry to overflow between adjacent holes due to the connection between adjacent holes and the layers, making it difficult to properly fill each grouting location. However, the present invention adopts a "deep hole + shallow hole" drilling method, staggering the deep and shallow holes. The slurry is drained by air in the shallow holes, improving the flow uniformity of the grouting liquid. Compared with the existing technology, the present invention effectively fills cracks, interlayer defects, and loose areas with slurry, improving the grouting fullness.

[0066] Those skilled in the art will appreciate that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A precise positioning and grouting method based on the treatment of asphalt pavement base diseases, characterized in that: The steps are as follows: S01: Use a ground penetrating radar vehicle to detect the road surface and obtain a road surface profile image; S02: For cracks in the pavement base, set up a measuring line at the location where the cracks occur; The coordinates of the bottom of the crack are taken as the origin, the driving direction is the X axis, the road width is the Y axis, and the road height is the Z axis to establish the coordinate axis, and mark the crack. The coordinates of the end of the crack are marked as (x b ,y b , z b ); then when When the crack penetrates the wheel track, the intersection coordinates of the crack and the wheel track are (x1, y1, z1), and the extended point of the intersection coordinates in the surface layer is used as the measuring point to set the measuring line, which extends to both ends along the X axis at the measuring point. If the crack does not extend to the wheel track, the coordinates on the side of the crack closest to the wheel track (x2, , z2) Set a measuring line at the extension point of the surface layer as the measuring point, and extend the measuring line to both ends along the X axis at the measuring point; When measuring cracks, at least two measuring points are set up along the length of the crack. The measuring line extends to both ends along the Y axis at the measuring point. The distance between two adjacent measuring lines is not less than 3m. The distance between the two ends of the measuring line and the measuring point is 0.8m~1.2m. S03: Use the radar data acquisition system to conduct detection along the survey line to obtain a radar image of the road surface structure; S04: formulating a disease treatment plan based on the pavement structure radar image obtained in step S03, setting grouting hole positions according to the disease treatment plan, and drilling holes using a drill to obtain grouting holes; S05: Perform grouting repair. During the repair process, the radar data acquisition system is used to repeatedly detect along the survey line until the radar image changes and shows that the grouting is completed.

2. The precise positioning and grouting method for treating asphalt pavement base diseases according to claim 1 is characterized in that: In step S01, the ground penetrating radar vehicle travels at a speed of 85-95 km / h.

3. The precise positioning and grouting method for treating asphalt pavement base defects according to claim 1 is characterized in that: In step S03, a shielded antenna and a 3D ground penetrating radar with a frequency of 800-900 MHz are used for data acquisition, and the speed of the 3D ground penetrating radar is ≤5 m / s.

4. The precise positioning and grouting method for treating asphalt pavement base defects according to claim 1 is characterized in that: In step S04, the following different grouting holes are set according to the type of crack damage: When the damage type is crack-type damage and the crack is a single crack, an L-shaped hole arrangement is adopted, and the distance between two adjacent grouting holes is 35 cm; When the damage type is crack-type damage, when a Z-shaped hole arrangement is adopted, the distance between two adjacent grouting holes is 50 cm, and an exhaust hole is set in the center of three adjacent grouting holes; When the damage type is interlayer poor type damage and loose type damage, the plum blossom pile hole arrangement method is adopted, the distance between two adjacent grouting holes is 0.8~1.2m, and exhaust holes are set in the centers of the four adjacent grouting holes.

5. The precise positioning and grouting method for treating asphalt pavement base defects according to claim 4 is characterized in that: The grouting holes adopt a "deep hole + shallow hole" grouting hole combination, the depth of the deep hole is drilled to the top of the lower base of the pavement structure, and the depth of the shallow hole is drilled to the top of the upper base.

6. The precise positioning and grouting method for treating asphalt pavement base defects according to claim 5 is characterized in that: The grouting order of the grouting holes is from deep holes to shallow holes, from grouting holes with lower terrain to grouting holes with higher terrain, and from grouting holes on the outermost side of the road to grouting holes on the inner side of the road. After grouting of each hole is completed, it is sealed with a sealing tool.

7. The precise positioning and grouting method for treating asphalt pavement base defects according to claim 1 is characterized in that: In step S05, the proportion of the filling distance in the detection width is determined according to the scale in the radar image, and the grouting diffusion distance is determined according to the proportion.

8. The precise positioning and grouting method for treating asphalt pavement base defects according to claim 7 is characterized in that: In step S05 , a shielded antenna and a 3D ground penetrating radar with a frequency of 800 to 900 MHz are used for data acquisition, and the speed of the 3D ground penetrating radar is ≤5 m / s.

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