Hot-melting repairing method for pits in asphalt pavement

Abstract

The invention discloses an asphalt pavement pit slot hot melting repairing method which comprises the following steps: firstly, removing a concrete asphalt mixed material at the bottom of a pit slot by using a shovel or a chisel, and cleaning the trimmed pit slot; then, the pit slot is trimmed, the vertical face of the stepped side wall is cut into a sawtooth-shaped structure, and each tangent plane of the side wall of the pit slot is polished; thirdly, hot-mix asphalt mixture layers are laid in the pit slots, a reinforcing rib structure is installed on the upper surface of each hot-mix asphalt mixture layer, surface layer materials are laid, and the surface layer materials are compacted; finally, re-pressing and final-pressing are conducted on the pit slot repairing face, and asphalt pavement pit slot repairing is completed. The stress capacity of the repaired pavement is improved, then the service life of the asphalt pavement is prolonged, meanwhile, the bonding area of new and old materials is increased, the bonding strength of the new and old materials is improved, and then the connecting strength of the new and old pavement materials is improved; the service life of the repaired pavement is further prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of asphalt pavement repair, and in particular to a hot-melt repair method for potholes in an asphalt pavement. Background Art

[0002] As an important part of modern transportation infrastructure, asphalt pavement carries a large amount of vehicle loads and complex environmental factors. As time goes by and the traffic volume increases, various diseases will inevitably appear on asphalt pavement, among which potholes are one of the most common problems that affect driving safety. Potholes not only reduce the flatness of the road surface, but also cause bumps when vehicles are driving, increasing the risk of traffic accidents. Therefore, timely and effective repair of potholes is crucial to ensure road safety and extend the service life of the road surface. With the advancement of technology, hot repair technology for potholes in asphalt pavement has gradually become an efficient, environmentally friendly and economical repair method. This technology softens the old asphalt material around the potholes through heating equipment, and then adds an appropriate amount of new asphalt mixture to fill and compact it, achieving a good combination of new and old materials.

[0003] The Chinese patent application number "2019108750507" discloses a waterproof edge sealing construction method for the joints of asphalt pavement grooves. A square foundation trench is excavated, and the grooves are aligned using a theodolite. The lengths of the grooves along the longitudinal and transverse directions of the original pavement are measured for the straight road section, or the lengths of the horizontal sides of the grooves along the diameter of the arc and the lengths of the vertical sides tangent to the edge of the arc are measured for the arc section, so as to obtain the size of the grooves to be cut. The grooves must be square or rectangular, and the wireframe must be kept parallel or perpendicular to the center line of the road. The grooves are cut in accordance with the principle of "square opening for round holes". Cutting is performed along the drawn lines with a cutting machine, and it is forbidden to use a pickaxe to cut directly. The invention relates to a method for repairing potholes on asphalt pavement by using hot-mix asphalt mixture for repair and rolling, and then strengthening the surface of the joints by applying epoxy asphalt adhesive, laying non-woven fabrics, applying SBS modified asphalt, and spreading crushed stone. This invention ensures the connection strength of the joints to a certain extent, reduces the stress on the joints, and extends the service life of the pothole repairs. However, after actually repairing potholes on asphalt pavement using this method, it was found that cracks would occur at the joints along the bonding positions of the non-woven fabric strips, and the newly repaired potholes were not the same as the theoretical effects in the technical solution. After a period of time, collapse, splitting, and fragmentation would occur. Summary of the invention

[0004] The purpose of the present invention is to provide a hot-melt repair method for potholes in asphalt pavements, which can not only improve the stress-bearing capacity of the repaired pavement and increase the practical life of the asphalt pavement, but also increase the bonding area of ​​new and old materials during the pothole repair process, and improve the connection strength between the new and old pavements, so as to solve the problems in the prior art.

[0005] To achieve the above object, the present invention is implemented by adopting the following technical solutions:

[0006] A hot melt repair method for asphalt pavement potholes, the steps are as follows:

[0007] Step S1, using a shovel or chisel to remove the concrete asphalt mixture material at the bottom of the pothole until the road surface base material is exposed;

[0008] Step S2, cleaning the trimmed pits and grooves, using a high-pressure hot air blower to remove loose materials, dust and debris in the pits and grooves;

[0009] Step S3, trimming the pothole in step S2, cutting multiple layers of stepped side walls symmetrically on both sides of the pothole in the direction across the road, and the remaining two side walls are perpendicular to the road surface, and the cross-section of the entire side wall should be neat and flat, and there should be no loose debris on the side wall;

[0010] Step S4, cutting the vertical surface of the stepped side wall in step S3 into a sawtooth structure, horizontally opening embedded grooves between the levels of the stepped side wall, and measuring and drawing the connection area around each layer of the stepped side wall;

[0011] Step S5, grinding each cut surface of the side wall of the pit to make the surface rough and smooth;

[0012] Step S6, paving the hot mix asphalt mixture layer by layer in the pit, and preliminarily compacting it, installing a reinforcing rib structure on the upper surface of each hot mix asphalt mixture layer, and the reinforcing rib structure extends into the embedded groove;

[0013] Step S7, spreading the surface material and compacting the surface material;

[0014] Step S8, re-pressing and final pressing the pothole repair surface to complete the asphalt pavement pothole repair.

[0015] By setting a reinforcing rib structure in the middle of the hot mix asphalt mixture layer, the stress-bearing capacity of the repaired road surface is improved, thereby increasing the service life of the asphalt pavement. In addition, the vertical surface of the stepped side wall is cut into a serrated structure when repairing, so that the old and new materials of the asphalt mixture can have a larger contact area, thereby improving the bonding strength between the new and old materials.

[0016] Furthermore, the bottom depth of the embedded groove in step S4 does not exceed 120 mm, and the width of the connection area does not exceed 140 mm.

[0017] Furthermore, the height of the hot mix asphalt mixture layer does not exceed 6 mm.

[0018] Furthermore, the steps for installing the reinforcing rib structure are as follows:

[0019] Step a, laying the reinforcement structure flat on the upper surface of the preliminarily compacted hot mix asphalt mixture;

[0020] Step b, extending the frame of the reinforcing rib structure into the embedded groove and pressing against the bottom of the embedded groove;

[0021] Step c, installing embedded parts at positions of the reinforcing rib structure corresponding to the vertical side walls of the pit;

[0022] Step d, spreading hot mix asphalt mixture again on the upper surface of the reinforcement structure and preliminarily compacting it;

[0023] Step e, pull out the embedded parts, put the asphalt prefabricated columns into the formed embedded channels, connect the bottom of the asphalt prefabricated columns with the reinforcing rib structure through downward pressure, and compact again.

[0024] Furthermore, the reinforcement rib structure includes a structural frame arranged in the embedded groove, horizontal reinforcement ribs connected to the structural frame, and embedded long tubes vertically arranged at the edge of the structural frame. The edge of the structural frame is provided with a plurality of installation positions suitable for connecting the embedded long tubes, and the embedded long tubes are detachably connected to the structural frame.

[0025] Furthermore, the installation position includes a positioning ring connected to the structural frame and a plurality of limit cards symmetrically distributed along the center of the positioning ring, the limit cards are divided into a supporting portion, a bending portion and a limit portion, and the limit cards are an integrally formed structure.

[0026] Furthermore, a limiting groove is provided on the inner side wall of the bottom end of the embedded long tube, and the limiting groove matches with the limiting clamp so as to be used for clamping the embedded long tube with the structural frame.

[0027] Furthermore, the horizontal reinforcement ribs are preferably but not limited to glass fiber mesh, polyester fiber mesh, and steel wire mesh.

[0028] The beneficial effects of the present invention are as follows: the present invention improves the force bearing capacity of the repaired pavement by arranging a reinforcing rib structure in the middle of the hot mix asphalt mixture layer, thereby increasing the service life of the asphalt pavement. At the same time, during the repair process, the vertical surface of the side wall of the pothole is cut into a serrated structure, which increases the bonding area of ​​the new and old materials, improves the bonding strength of the new and old materials, thereby improving the connection strength of the new and old pavement materials, and further extending the service life of the repaired pavement. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A cross-sectional structural diagram of a road pothole after repair provided by the present invention;

[0030] Figure 2 for Figure 1 A magnified view of part A;

[0031] Figure 3 A top view of a trimmed pit provided by the present invention;

[0032] Figure 4 A schematic diagram of the overall structure of the reinforcing rib structure provided by the present invention;

[0033] Figure 5 is a schematic diagram of the overall structure of the reinforcement rib structure from another perspective;

[0034] Figure 6 for Figure 5 A magnified view of part B;

[0035] Figure 7 It is a top view of the reinforcement structure;

[0036] Figure 8 for Figure 7 Schematic diagram of the middle DD section;

[0037] Fig. 9 for Figure 8 Magnified view of part C.

[0038] Explanations in the figure: 10, asphalt pavement; 11, base layer; 12, asphalt mixture layer; 13, surface layer; 20, embedded groove; 30, reinforcement rib structure; 31, structural frame; 32, horizontal reinforcement rib; 34, embedded long pipe; 341, limiting groove; 40, installation position; 41, positioning tube; 42, limiting card; 421, supporting part; 422, bending part; 423, limiting part. DETAILED DESCRIPTION

[0039] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific implementation disclosed below.

[0040] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0041] The examples are as follows:

[0042] A hot melt repair method for asphalt pavement potholes, the steps are as follows:

[0043] Step S1, using a shovel or chisel to remove the concrete asphalt mixture material at the bottom of the pothole until the road surface base material is exposed;

[0044] Step S2, cleaning the trimmed pits and grooves, using a high-pressure hot air blower to remove loose materials, dust and debris in the pits and grooves;

[0045] Step S3, trimming the pothole in step S2, cutting multiple layers of stepped side walls symmetrically on both sides of the pothole in the direction across the road, and the remaining two side walls are perpendicular to the road surface, and the cross-section of the entire side wall should be neat and flat, and there should be no loose debris on the side wall;

[0046] Step S4, cutting the vertical surface of the stepped side wall in step S3 into a sawtooth structure, horizontally opening embedded grooves between the levels of the stepped side wall, measuring and drawing the connection area around each layer of the stepped side wall, wherein the depth of the bottom of the embedded groove is 110 mm, and the width of the connection area is 130 mm;

[0047] Step S5, grinding each cut surface of the side wall of the pit to make the surface rough and smooth;

[0048] Step S6: paving hot-mix asphalt mixture layers in the pit layer by layer, the height of the hot-mix asphalt mixture layer is 6 mm, and preliminarily compacting, and installing a reinforcing rib structure on the upper surface of each hot-mix asphalt mixture layer, and the reinforcing rib structure extends into the embedded groove;

[0049] Step S7, paving the surface layer material, compacting the surface layer material, the middle height of the surface layer material is 4mm higher than the road surface height, to ensure that the surface layer material is forced to extend into the embedded groove during the compaction process and is fully filled;

[0050] Step S8, re-pressing and final pressing the pothole repair surface to complete the asphalt pavement pothole repair.

[0051] like Figure 1 , Figure 2 , Figure 3 In the road pothole repair structure shown, the asphalt pavement 10 is divided into a base layer 11, an asphalt mixture layer 12 and a surface layer 13 from bottom to top, wherein the asphalt mixture layer 12 is filled layer by layer according to the repaired stepped potholes, and a reinforcing rib structure 30 is embedded on the upper surface of each asphalt mixture layer 12 to increase the stress-bearing capacity of the repaired road surface, thereby increasing the service life of the asphalt pavement. In the actual hot pothole repair work, the old road material is difficult to cut, so holes can be drilled on both sides of the pre-grooved position by an electric drill, and then a pre-buried groove is opened between the two holes by an angle grinder.

[0052] As a technical solution of this embodiment, further, the steps of installing the reinforcing rib structure are as follows:

[0053] Step a, laying the reinforcement structure flat on the upper surface of the preliminarily compacted hot mix asphalt mixture;

[0054] Step b, extending the frame of the reinforcing rib structure into the embedded groove and pressing against the bottom of the embedded groove;

[0055] Step c, installing embedded parts at positions of the reinforcing rib structure corresponding to the vertical side walls of the pit;

[0056] Step d, spreading hot mix asphalt mixture again on the upper surface of the reinforcement structure and preliminarily compacting it;

[0057] Step e, pull out the embedded parts, put the asphalt prefabricated columns into the formed embedded channels, connect the bottom of the asphalt prefabricated columns with the reinforcing rib structure through downward pressure, and compact again.

[0058] Among them, Figures 4 to 8 The reinforcement rib structure 30 shown includes a structural frame 31 arranged in the embedded groove 20, horizontal reinforcement ribs 32 connected to the structural frame 31, and embedded long tubes 34 vertically arranged at the edge of the structural frame 31. The edge of the structural frame 31 is provided with a plurality of installation positions 40 suitable for connecting the embedded long tubes 34, and the embedded long tubes 34 are detachably connected to the structural frame 31.

[0059] As a technical solution of this embodiment, further, Fig. 9 The installation position 40 shown includes a positioning tube 41 connected to the structural frame 31 and two limit cards 42 symmetrically distributed along the center of the positioning tube 41. The limit card 42 is divided into a supporting portion 421, a bending portion 422 and a limit portion 423. The limit card 42 is an integrally formed structure, and the structural frame 31 and the limit card 42 are preferably made of copper material.

[0060] Among them, Figure 6 A limiting groove 341 is provided on the inner side wall of the bottom end of the embedded long tube 34 shown. The limiting groove 341 matches with the limiting clamp 42 so as to be used for the embedded long tube 34 to be clamped with the structural frame 31 .

[0061] As a technical solution of this embodiment, further, the horizontal reinforcing ribs 32 are preferably but not limited to glass fiber mesh, polyester fiber mesh, and steel wire mesh.

[0062] As another situation of this embodiment, for asphalt pavement with a large repair area and a large pothole area, after filling with hot-mix asphalt mixture, vertical reinforcements can be welded on the horizontal reinforcements or fastened by wire tying, and the height of the vertical reinforcements shall not exceed 4 mm.

[0063] In summary: the present invention improves the stress-bearing capacity of the repaired pavement, thereby increasing the service life of the asphalt pavement. At the same time, it increases the bonding area of ​​new and old materials, improves the bonding strength of new and old materials, thereby improving the connection strength of new and old pavement materials, and further extending the service life of the repaired pavement.

[0064] The basic principles and main features of the present invention and the advantages of the present invention are shown and described above. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention; therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is limited by the attached claims rather than the above description. Therefore, it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the present invention, and any figure marks in the claims should not be regarded as limiting the claims involved.

[0065] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A hot melt repair method for asphalt pavement potholes, characterized in that: Here are the steps: Step S1, using a shovel or chisel to remove the concrete asphalt mixture material at the bottom of the pothole until the road surface base material is exposed; Step S2, cleaning the trimmed pits and grooves, using a high-pressure hot air blower to remove loose materials, dust and debris in the pits and grooves; Step S3, trimming the pothole in step S2, cutting multiple layers of stepped side walls symmetrically on both sides of the pothole in the direction across the road, and the remaining two side walls are perpendicular to the road surface, and the cross-section of the entire side wall should be neat and flat, and there should be no loose debris on the side wall; Step S4, cutting the vertical surface of the stepped side wall in step S3 into a sawtooth structure, horizontally opening embedded grooves between the levels of the stepped side wall, and measuring and drawing the connection area around each layer of the stepped side wall; Step S5, grinding each section of the side wall of the pit to make the surface rough and smooth; Step S6, paving the hot mix asphalt mixture layer by layer in the pit, and preliminarily compacting it, installing a reinforcing rib structure on the upper surface of each hot mix asphalt mixture layer, and the reinforcing rib structure extends into the embedded groove; Step S7, spreading the surface material and compacting the surface material; Step S8, re-pressing and final pressing the pothole repair surface to complete the asphalt pavement pothole repair.

2. The method for hot-melt repair of potholes in asphalt pavement according to claim 1, characterized in that: The depth of the bottom of the embedded groove in step S4 does not exceed 120 mm, and the width of the connection area does not exceed 140 mm.

3. The method for hot-melt repair of potholes in asphalt pavement according to claim 1, characterized in that: The height of the hot mix asphalt mixture layer shall not exceed 6 mm.

4. The method for hot-melt repair of asphalt pavement potholes according to claim 1, characterized in that: The steps for installing the reinforcing rib structure are as follows: Step a, laying the reinforcement structure flat on the upper surface of the preliminarily compacted hot mix asphalt mixture; Step b, extending the frame of the reinforcing rib structure into the embedded groove and pressing against the bottom of the embedded groove; Step c, installing embedded parts at positions of the reinforcing rib structure corresponding to the vertical side walls of the pit; Step d, spreading hot mix asphalt mixture again on the upper surface of the reinforcement structure and preliminarily compacting it; Step e, pull out the embedded parts, put the asphalt prefabricated columns into the formed embedded channels, connect the bottom of the asphalt prefabricated columns with the reinforcing rib structure through downward pressure, and compact again.

5. The method for hot-melt repair of potholes in asphalt pavement according to claim 4, characterized in that: The reinforcing rib structure includes a structural frame arranged in the embedded groove, horizontal reinforcing ribs connected to the structural frame, and embedded long tubes vertically arranged at the edge of the structural frame. The edge of the structural frame is provided with a plurality of installation positions suitable for connecting the embedded long tubes, and the embedded long tubes are detachably connected to the structural frame.

6. A hot melt repair method for asphalt pavement potholes according to claim 5, characterized in that: The installation position includes a positioning ring connected to the structural frame and a plurality of limit cards symmetrically distributed along the center of the positioning ring. The limit cards are divided into a supporting portion, a bending portion and a limit portion. The limit cards are an integrally formed structure.

7. The method for hot-melt repair of potholes in asphalt pavement according to claim 6, characterized in that: A limiting groove is provided on the inner side wall of the bottom end of the embedded long tube, and the limiting groove matches with the limiting clamp so as to be used for clamping the embedded long tube with the structural frame.

8. The method for hot-melt repair of potholes in asphalt pavement according to claim 5, characterized in that: The horizontal reinforcing ribs are preferably, but not limited to, glass fiber mesh, polyester fiber mesh, and steel wire mesh.

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