A method for repairing the base course of a semi-rigid pavement

Abstract

The present invention belongs to the technical field of road maintenance and repair, and specifically relates to a method for repairing the semi-rigid pavement base. The repair method includes: Step 1, marking the boundary of the pothole; Step 2, milling out the pothole; Step 3, laying a plurality of prestressed components at the bottom of the pothole, the prestressed components are arranged longitudinally along the road, and a prestressed tendon is included in the prestressed components; Step 4, tensioning each prestressed tendon; and erecting formworks on both sides of the prestressed components and pouring cement concrete, and removing the formworks after the cement concrete solidifies to the set strength; Step 5, laying rubble around the prestressed components in the pothole; Step 6, laying a pressure equalizing net on the rubble and the prestressed components; Step 7, backfilling asphalt concrete into the pothole; Step 8, rolling the asphalt concrete in the pothole flat; Step 9, completing the repair operation after the asphalt concrete cools. This repair method has good comprehensive social and economic benefits.

Description

Technical Field

[0001] The invention belongs to the technical field of road maintenance and repair, and particularly relates to a semi-rigid pavement base repair method. Background Art

[0002] With the rapid development of social economy, urban construction is changing with each passing day, and roads extend in all directions, greatly facilitating the production, work, and living needs of enterprises, commerce, and the people. At the same time, the general trunk road network is becoming increasingly perfect, making logistics transportation and people's travel more convenient, and further promoting the vigorous development of the road area economy. The urbanization on both sides of ordinary highways has emerged like bamboo shoots after a spring rain, injecting strong vitality into the further development of the local economy. However, on the one hand, the distribution of residential houses around urban roads is relatively dense; on the other hand, urbanization is constantly emerging on both sides of ordinary trunk roads; thirdly, in the process of building roads connecting townships and villages, low-grade roads such as county and township roads and village roads are built relying on townships and villages as important nodes, and it is quite common to pass through villages and towns.

[0003] The road has reached the doorstep, facilitating people's travel and logistics transportation. However, with the increase in the service life of the road, diseases and damages gradually appear. When the service life of the road is reached, renovation and reconstruction are inevitable, and at this time, contradictions and problems also emerge. In the process of road engineering construction, especially in the repair of semi-rigid pavement bases, in order to ensure the strength of the pavement base, usually, the asphalt layer and the cement stabilized macadam base at the damaged position of the road surface are first excavated, then the cement stabilized macadam base material is backfilled and subjected to impact vibration compaction, and finally, asphalt concrete is backfilled and compacted; during the impact vibration rolling operation by a heavy roller, the strong vibration will cause certain impacts on surrounding buildings, and even damage. Therefore, it is generally very inconvenient and difficult to repair and reconstruct existing roads in sections passing through villages and towns, especially when the houses on both sides of the road are old and have a low safety factor.

[0004] Therefore, an improved technical solution is needed to address the above deficiencies in the prior art. Summary of the Invention

[0005] The purpose of the invention is to provide a semi-rigid pavement base repair method to at least solve the above problems existing in the prior art.

[0006] To achieve the above purpose, the invention provides the following technical solutions:

[0007] A semi-rigid pavement base repair method, the repair method comprising the following steps:

[0008] Step 1, determine the location and area of the pavement base disease and mark the boundary of the pothole;

[0009] Step 2: According to the boundaries of the potholes, mill the potholes, and recycle the milled materials. T-shaped grooves are provided at the positions corresponding to both ends of the prestressed tendons in the potholes. The T-shaped grooves include transverse grooves and longitudinal grooves. The transverse grooves are perpendicular to the longitudinal grooves. One end of the transverse groove communicates with the middle of the longitudinal groove, and the other end of the transverse support communicates with the pothole.

[0010] Step 3: Lay a plurality of prestressed components at the bottom of the pothole. The prestressed components are arranged longitudinally along the road. Each prestressed component includes at least one prestressed tendon. The prestressed component further includes a support plate and a tensioning nut. The threaded ends of the prestressed tendons are located in the T-shaped grooves, and the support plate is erected on the side of the longitudinal groove facing the transverse groove.

[0011] Step 4: Tension each prestressed tendon; erect formworks on both sides of the prestressed component, and pour cement concrete in the formworks to keep the prestressed tendons in a tensioned state. After the cement concrete solidifies to the set strength, remove the formworks.

[0012] Step 5: Lay rubble around the prestressed components in the pothole.

[0013] Step 6: Lay a voltage equalizing net on the rubble and the prestressed components.

[0014] Step 7: Backfill the pothole with asphalt concrete mixed with recycled asphalt surface milled materials.

[0015] Step 8: Roll and level the asphalt concrete in the pothole.

[0016] Step 9: After the compacted asphalt concrete cools to normal temperature, complete the repair operation.

[0017] In the semi-rigid pavement base repair method as described above, preferably, both ends of the prestressed tendon are threaded ends, external threads are provided on both threaded ends, a tensioning nut is threadedly connected to the threaded end of each prestressed tendon, and a support plate abuts against the inner side of each tensioning nut.

[0018] In the semi-rigid pavement base repair method as described above, preferably, the prestressed component further includes a steel cage, the prestressed tendon passes through the center of the steel cage, and the steel cage is located between the two support plates.

[0019] In the semi-rigid pavement base repair method as described above, preferably, in Step 2, the asphalt surface layer is milled for the first time, and the milled asphalt is collected for recycling.

[0020] Then adjust the milling thickness, and perform a second milling on the cement stabilized macadam base layer under the milled asphalt surface layer, and collect the milled macadam for recycling; the thickness of the second milling is less than the thickness of the original cement stabilized macadam base layer.

[0021] For the semi-rigid pavement base repair method as described above, preferably, in step 5, the thickness of the rubble is less than the thickness of the original cement stabilized macadam base layer, the rubble has no less than five faces, and the largest plane of the rubble is placed downward.

[0022] For the semi-rigid pavement base repair method as described above, preferably, in step 7, before backfilling the pothole with asphalt concrete, first spray tack coat oil on the side and top surfaces of the cement concrete of the prestressed component, and spray emulsified asphalt penetration oil on the remaining parts in the pothole.

[0023] For the semi-rigid pavement base repair method as described above, preferably, in step 7, backfill the pothole with coarse-grained asphalt concrete mixed with recycled asphalt surface layer milled material, and perform initial compaction on the asphalt concrete. The asphalt concrete after initial compaction is higher than the top surface of the original cement stabilized macadam base layer around the pothole.

[0024] For the semi-rigid pavement base repair method as described above, preferably, perform multiple repeated rolling on the asphalt concrete until the asphalt concrete meets the design compaction degree requirements.

[0025] Beneficial effects:

[0026] In this repair method, by setting prestressed components in the pothole, the prestressed components after tensioning have greater load-bearing capacity, which can greatly improve the load-bearing capacity of the reconstructed road and avoid the repeated damage of the repaired position due to large stress.

[0027] This application uses the mutual cooperation of prestressed components and rubble to replace the original semi-rigid cement stabilized macadam base layer. Among them, the prestressed components after tensioning can provide greater load-bearing capacity, and the scattered rubble structure can better simulate the elastic modulus of the semi-rigid cement stabilized macadam base layer, ensuring that the repaired road has a longer service life and lower later maintenance costs, greatly reducing the maintenance costs during the entire life cycle of the road, reducing the number of road repairs, and reducing the traffic closure time; and the entire repair process does not require strong impact vibration rolling construction operations, greatly reducing the impact on surrounding buildings of the road; and in this repair method, through the recycling and reuse of the milled material, it can not only save construction costs to a certain extent, but also be more environmentally friendly; making the repair method have good comprehensive social and economic benefits. Description of the drawings

[0028] The attached drawings of the specification, which form a part of this application, are used to provide a further understanding of the present invention. The schematic embodiments and descriptions thereof of the present invention are used to explain the present invention and do not constitute an improper limitation to the present invention. Among them:

[0029] Figure 1 It is a top view of a pit in an embodiment of the present invention.

[0030] Figure 2 It is a cross-sectional view of the position of the prestressing component in the pit in an embodiment of the present invention.

[0031] Figure 3 It is a cross-sectional view of the position of the rubble in the pit in an embodiment of the present invention.

[0032] In the figure: 1. Pit; 2. T-shaped groove; 3. Prestressing component; 31. Prestressing tendon; 32. Support plate; 33. Tightening nut; 34. Steel reinforcement cage; 4. Rubble; 5. Equalizing grid; 6. Asphalt concrete. Detailed implementation manners

[0033] Next, the technical solutions in the embodiments of the present invention will be described clearly and completely. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present invention.

[0034] In the description of the present invention, the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", etc. is based on the orientation or positional relationship shown in the attached drawings. It is only for the convenience of describing the present invention rather than requiring the present invention to be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. The terms "connected" and "coupled" used in the present invention should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection; it can be directly connected or indirectly connected through an intermediate component. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0035] Next, the present invention will be described in detail with reference to the attached drawings and in combination with embodiments. It should be noted that, without conflict, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0036] According to a specific embodiment of the present invention, as Figures 1-3 shown, the present invention provides a semi-rigid pavement base repair method, and the repair method includes the following steps:

[0037] Step 1: Determine the location and area of the pavement base course diseases, and mark the boundary of the pothole 1.

[0038] In this embodiment, in Step 1, construction preparations are first made, which specifically include the following:

[0039] 1. Prepare asphalt mixtures, emulsified asphalt, blocky crushed stones 4, steel bar materials, geogrids, etc. that meet quality requirements.

[0040] 2. Prepare construction machinery and equipment such as milling machines, skid steer sweepers, blowers, asphalt distributors, loaders, graders, tandem drum light vibratory rollers, and rubber tired rollers.

[0041] 3. Determine the scope of the pothole 1: According to the road deflection detection data and combined with on-site investigations, determine the location and area of the pavement base course diseases. According to the principle of "round pothole, square repair", mark the boundary of the pothole 1 perpendicular or parallel to the road center line, and the marked range is 40 - 50 cm wider than the actual edge of the pothole 1.

[0042] 4. Implement traffic control on the construction section, set warning signs and enclosures, and guide vehicles and pedestrians to detour.

[0043] Step 2: Milling out the pothole 1 according to the boundary of the pothole 1, and recycle the milled materials.

[0044] Step 3: Lay a plurality of prestressed components 3 at the bottom of the pothole 1. The prestressed components 3 are arranged longitudinally along the road, and each prestressed component 3 includes at least one prestressed tendon 31.

[0045] Step 4: Tension each prestressed tendon 31; erect formworks on both sides of the prestressed component 3 and pour cement concrete in the formworks to keep the prestressed tendons 31 in a tensioned state. After the cement concrete solidifies to the set strength, remove the formworks.

[0046] Step 5: Lay crushed stones 4 around the prestressed component 3 in the pothole 1.

[0047] Step 6: Lay a pressure equalizing net 5 on the crushed stones 4 and the prestressed component 3; in this embodiment, the heights of the prestressed component 3 and the crushed stones 4 are close. The pressure equalizing net 5 can better disperse the load acting forces received by the asphalt concrete 6 to the prestressed component 3 and the crushed stones 4, so that the prestressed component 3 and the crushed stones 4 can better play their load-bearing roles; moreover, the pressure equalizing net 5 can also effectively prevent or slow down the reflection cracks caused at the joint between the prestressed cement concrete and the asphalt concrete 6, and extend the service life of the road.

[0048] In this embodiment, the pressure equalizing net 5 can adopt a geogrid or a steel mesh structure. Among them, the geogrid is corrosion-resistant, has a long service life, and low cost, and has the advantages of convenient and fast construction, short construction period, and low construction cost.

[0049] The steel bar mesh is composed of multiple transverse steel bars and multiple longitudinal steel bars, which has relatively high strength but high cost. There is no limit on the spacing between the transverse steel bars and the longitudinal steel bars in its load-bearing function, and the spacing between the transverse steel bars and the longitudinal steel bars in the steel bar mesh can be selected according to the actual on-site construction requirements.

[0050] Step 7, backfill the asphalt concrete 6 mixed with recycled asphalt surface milling material into the pothole 1;

[0051] Step 8, roll and flatten the asphalt concrete 6 in the pothole 1;

[0052] Step 9, after the compacted asphalt concrete 6 cools to room temperature, complete the repair operation.

[0053] Since the positions of road diseases are often the positions where the stress is relatively large, such as the parts where medium and large-sized buses or trucks often pass, only using general repair methods can only ensure the flatness of the road for a short period of time. After a long time, these road disease positions will repeatedly break, which requires repeated repairs to these road disease positions, greatly affecting the traffic efficiency of the road.

[0054] In this repair method, after milling a pothole 1 at the road disease location, first lay multiple prestressed components 3 in the pothole 1 and make the prestressed components 3 extend along the longitudinal direction of the road; then tension the prestressed tendons 31 in the prestressed components 3, and then pour cement concrete in the prestressed components 3 to keep the prestressed tendons 31 in their tensioned state; by setting the prestressed components 3 in the pothole 1, the tensioned prestressed components 3 have greater load-bearing capacity, which can greatly improve the load-bearing capacity of the repaired road and avoid the repeated damage of the repaired position due to large stress.

[0055] In addition, after the construction of the prestressed components 3 is completed, lay crushed stones 4 around the prestressed components 3 in the pothole 1. Each crushed stone 4 has good load-bearing capacity, and the multiple laid crushed stones 4 are evenly distributed in the pothole 1. The laid layer of crushed stones 4 has good semi-rigid performance.

[0056] That is, this application uses the cooperation between the prestressed component 3 and the rubble 4 to replace the original semi-rigid cement stabilized macadam base layer. Among them, the prestressed component 3 after tensioning can provide greater bearing capacity, and the scattered rubble 4 structure can better simulate the elastic modulus of the semi-rigid cement stabilized macadam base layer, ensuring that the repaired road has a longer service life and lower later maintenance costs, greatly reducing the maintenance costs during the entire life cycle of the road, reducing the number of road repairs, and reducing the traffic closure time; and the entire repair process does not require strong impact vibration rolling construction operations, greatly reducing the impact on the surrounding buildings of the road, making the repair method have better comprehensive social and economic benefits.

[0057] The prestressed component 3 further includes a support plate 32 and a tensioning nut 33.

[0058] Both ends of the prestressing tendon 31 are threaded ends, and external threads are provided on both threaded ends. A tensioning nut 33 is threadedly connected to the threaded end of each prestressing tendon 31, and a support plate 32 abuts against the inner side of each tensioning nut 33.

[0059] In an embodiment of the present application, each prestressed component 3 includes a prestressing tendon 31, two support plates 32 and two tensioning nuts 33. A perforation is provided in the center of each support plate 32. The threaded end of the prestressing tendon 31 first passes through the perforation in the center of the support plate 32, and then the tensioning nut 33 is screwed onto the threaded end of the prestressing tendon 31. The prestressing tendon 31 can be tensioned by rotating the tensioning nut 33. With such a setting, the prestressed component 3 is more convenient to use, thus facilitating its application in road repair operations.

[0060] The prestressed component 3 further includes a steel cage 34. The prestressing tendon 31 passes through the center of the steel cage 34, and the steel cage 34 is located between the two support plates 32.

[0061] In an embodiment of the present application, in step 4, formworks are erected on both sides of the steel cage 34. After the steel cage 34 is surrounded by the formworks on both sides and the two support plates 32, cement concrete is poured into the formworks. The prestressed component 3 provided with the steel cage 34 has better structural strength after pouring the concrete, can enable the prestressing tendon 31 in the prestressed component 3 to exert a better prestress tensioning effect, and ensure that the prestressed component 3 has greater bearing capacity.

[0062] T-shaped grooves 2 are provided at the positions corresponding to both ends of the prestressing tendon 31 in the pothole 1. The T-shaped grooves 2 include a transverse groove and a longitudinal groove. The transverse groove is perpendicular to the longitudinal groove. One end of the transverse groove communicates with the middle of the longitudinal groove, and the other end of the transverse support communicates with the pothole 1.

[0063] The threaded end of the prestressing tendon 31 is located in the T-shaped groove 2, and the support plate 32 is erected on the side of the longitudinal groove facing the transverse groove.

[0064] In an embodiment of the present application, after the prestressed component 3 is laid in the pothole 1, the threaded ends at both ends of the prestressed tendon 31 are respectively located in the T-shaped grooves 2 on both sides of the pothole 1; the support plate 32 is erected on one side of the longitudinal groove facing the transverse groove. At this time, there is a certain gap between the support plate 32 and the end of the steel reinforcement cage 34, so that the support plate 32 does not directly contact the steel reinforcement cage 34. That is, at this time, the longitudinal groove plays a supporting role for the support plate 32, thereby preventing the support plate 32 from transmitting the applied force to the steel reinforcement cage 34, and further preventing the steel reinforcement cage 34 from deforming due to excessive force.

[0065] Among them, when tensioning the prestressed tendon 31, since it is impossible to place large tensioning equipment in the pothole 1; at this time, by rotating the tensioning nuts 33 at both ends of the prestressed tendon 31, the prestressed tendon 31 is gradually tensioned and tightened; the operation of tensioning by selecting the tensioning nuts 33 is relatively simple and more convenient for use in the repair operation of the road surface base layer; and this repair method is mainly for the semi-rigid road surface base layer. That is, the prestressed tendon 31 does not require a particularly large tensioning stress. The tensioning stress of the prestressed tendon 31 in this repair method only needs to meet the use requirements of the semi-rigid road surface base layer.

[0066] In step 2, first perform the first milling on the asphalt surface layer, collect the milled asphalt for recycling; then adjust the milling thickness, and perform the second milling on the cement stabilized macadam base layer under the milled asphalt surface layer, and collect the milled macadam for recycling; the thickness of the second milling is less than the original thickness of the cement stabilized macadam base layer.

[0067] In an embodiment of the present application, when performing the first milling on the asphalt surface layer, the range of the first milling is 40 - 50 cm wider than the four edges of the marked pothole; after the asphalt surface layer milling machine is finished, observe the pothole disease situation again. When there are changes in the disease compared with the previous survey results, further correct the disease location and area. When the changes are small, adjust the milling width and thickness, and the width is reduced by about 30 cm on the basis of the original milled asphalt surface layer; that is, when performing the second milling on the cement stabilized macadam base layer, the range of the second milling is 10 - 20 cm wider than the four edges of the marked pothole; so that the four edges of the first milling range are 30 - 40 cm wider than the four edges of the second milling range; that is, a step about 30 cm wide is formed between the four sides of the milled asphalt surface layer and the cement stabilized macadam base layer.

[0068] In an embodiment of the present application, first adjust the milling thickness of the milling machine according to the surveyed thickness of the asphalt surface layer, and perform the first milling on the damaged asphalt surface layer at the marked pothole 1 position, and directly convey the milled asphalt mixture into the carriage of the dump truck, and transport it to the set position by the dump truck for further recycling.

[0069] After the asphalt surface milling machine finishes its operation, adjust the milling thickness and conduct a second milling on the cement stabilized macadam base layer beneath the milled asphalt surface layer. Control the milling thickness well. The set thickness for the second milling is 0.2 - 0.3 cm less than the cement stabilized macadam base layer, and try not to damage the underlying layer. The milled cement stabilized macadam mixture is transported to the set location by a dump truck for further recycling. The asphalt mixture and the cement stabilized macadam mixture are stacked separately and utilized classified.

[0070] After the milling operation is completed, use a skid steer sweeper to clean the pothole 1 and remove the cement stabilized macadam base layer attached to the underlying layer. After the cleaning is completed, further use a blower to clean the floating ash in the pothole 1 to ensure that the pothole 1 is clean and free of looseness.

[0071] In step 5, the thickness of the riprap 4 is less than the thickness of the original cement stabilized macadam base layer. The riprap 4 has no less than five faces, and the largest plane of the riprap 4 is placed downward.

[0072] In an embodiment of the present application, the riprap 4 is manually paved; the prepared block-shaped riprap 4 is evenly stacked at the bottom of the pothole 1, and the spacing between adjacent riprap 4 ranges from 3 to 6 cm. The block-shaped riprap 4 has no less than 5 faces, and the contact surface with the bottom of the pothole 1 is guaranteed to be flat and not less than the area of the other several faces to ensure stable stacking. The top surface of the stacked block-shaped riprap 4 has a certain area and is basically guaranteed to be horizontal. The selected block stone thickness is generally 14 - 17 cm, and is 2 - 3 cm less than the layer thickness of the cement stabilized macadam base layer. For stones that do not meet the requirements, they are further crushed by a small crusher, and those that do not meet the requirements are not allowed to be used. As raw materials, preferably use quarry bluestone with edges and corners, good interlocking property, no impurities, and excellent hard texture.

[0073] In step 7, before backfilling the asphalt concrete 6 in the pothole 1, first spray tack coat on the side and top surfaces of the cement concrete of the prestressed component 3, and spray emulsified asphalt prime coat on the remaining parts in the pothole 1. In an embodiment of the present application, use an asphalt distributor to spray emulsified asphalt prime coat into the pothole 1, and the asphalt dosage is not less than 1.5 L / m 2 And ensure that the riprap 4 is evenly coated except for the bottom surface, and manually re-spray if there are white and flower omissions. The parts that do not cover the riprap 4 should be fully sprayed, and the depth of the emulsified asphalt prime coat penetrating into the bottom of the pothole 1 is not less than 5 mm. The emulsified asphalt prime coat is also evenly sprayed on the side wall of the pothole 1, and the depth of the prime coat penetrating into the side wall is not less than 5 mm to enhance the bonding force between the new and old road surfaces. In addition, spray tack coat on the side and top surfaces of the cement concrete of the prestressed component 3 to enhance the bonding effect between the cement concrete surface and the asphalt concrete 6.

[0074] In step 7, backfill the pothole 1 with coarse-grained asphalt concrete 6 admixed with recycled asphalt surface milling material, and conduct initial compaction on the asphalt concrete 6. The asphalt concrete 6 after initial compaction is higher than the original cement stabilized macadam base course pavement outside the pothole 1.

[0075] In an embodiment of the present application, the coarse-grained asphalt concrete 6 is admixed with 10 - 20% of recycled asphalt surface milling material. By recycling and reusing the milling material, it can not only save construction costs to a certain extent but also be more environmentally friendly.

[0076] In an embodiment of the present application, after the emulsified asphalt prime coat breaks, the moisture evaporates and the formation is stable, lay the asphalt concrete 6 interlock material. The interlock material uses AC-25C coarse-grained asphalt concrete 6. The asphalt concrete 6 is transported to the outside of the pothole 1 by a dump truck. The dump truck reverses parallel to the road center line. When the rear wheels are 20 - 30 cm away from the edge of the pothole 1 and at the middle position of the pothole 1, stop to avoid the wheels damaging the side wall of the pothole 1.

[0077] Before unloading, check that there are no people and obstacles above and around. Lift the carriage. According to the area of the pothole 1 and the influence range of the dump truck for unloading, calculate the amount of asphalt concrete 6. When the carriage is lifted to a certain angle and the unloaded asphalt concrete 6 meets the influence range of the vehicle's standing position, stop lifting and start unloading. After unloading, slightly move the vehicle forward to let the asphalt concrete 6 completely fill the outer edge of the pothole 1. Reset the carriage, lock the tilt operating lever, and the vehicle drives out of the construction area. The loader drives into the construction area. The loader evenly pushes the asphalt concrete 6 mixture unloaded into the pothole 1 in the pothole 1. When pushing the material, use the two-time flat-pushing method to reduce the overflow of the asphalt concrete 6 outside the pothole 1. When pushing for the first time, the bucket is parallel to the center line of the pothole 1, and one side of the bucket is flush with the center line; the other side of the bucket is outside the pothole 1 and parallel to the outer edge of the pothole 1. Use the loader for rough leveling. After the rough leveling of one half-width is completed, start the construction of the other half-width pothole 1. When pushing for the second time, the bucket is parallel to the center line of the pothole 1, and one side slightly exceeds the center line to ensure that the asphalt concrete 6 mixture left on the other side of the center line during the first flat-pushing is also evenly laid in the pothole 1. Use the loader for rough leveling. The asphalt concrete 6 in the entire pothole 1 is basically kept at one horizontal plane and is 2 - 3 cm higher than the top surface of the base course. When the loader finishes rough leveling, use a grader to further level the asphalt concrete 6 in the pothole 1. When the asphalt concrete 6 is unevenly paved, manually cooperate with the grader to dig out and replenish the asphalt concrete 6. During the leveling process, use the grader tires to conduct initial compaction on the mixture once. After the initial compaction is completed, the asphalt concrete 6 mixture in the pothole 1 is 1 - 2 cm higher than the top surface of the base course.

[0078] When the first paving does not complete the entire pothole 1, after the loader and grader level and initially compact, the dump truck loaded with asphalt concrete 6 drives into the pothole 1 where asphalt concrete 6 has been paved and roughly initially compacted, and the foregoing processes are repeated until the entire filling of the pothole 1 is completed. If the operations are repeated multiple times, finally the grader levels and initially compacts the entire pothole 1 once. After the initial compaction is completed, the asphalt concrete 6 in the pothole 1 is 1 - 2 cm higher than the top surface of the original cement stabilized macadam base course.

[0079] The asphalt concrete 6 is repeatedly rolled multiple times until the asphalt concrete 6 meets the design compaction degree requirements. In an embodiment of the present application, for the initial compaction, a double - steel - wheel light - duty vibratory roller is used for rolling from the edge of the pothole 1 towards the middle. The rolling speed of the roller should be uniform, and the initial compaction speed should be preferably 2 - 3 km / h, with 3 passes of rolling.

[0080] The re - compaction follows the initial compaction immediately. For the re - compaction, a rubber - tired roller is used for rolling, with a rolling speed of 2 - 4 km / h and 4 passes of rolling until the required compaction degree is achieved and there are no obvious wheel marks.

[0081] The final compaction follows the re - compaction immediately. After the re - compaction is completed, a vibratory roller is used for compaction, with a rolling speed of 2 - 4 km / h and 1 - 2 passes of rolling until there are no wheel marks.

[0082] In this embodiment, the asphalt concrete 6 after the final compaction is flush with the top surface of the original cement stabilized macadam base course; then, an asphalt surface course is constructed above the asphalt concrete 6 after the final compaction. The finally constructed asphalt surface course is flush with the original asphalt surface course around the pothole. After the construction of the asphalt surface course is completed, the construction signs are removed and the traffic is opened.

[0083] It can be understood that the above description is only exemplary, and the embodiments of the present application do not limit this.

[0084] The above are only the preferred embodiments of the present invention - creation, and are not used to limit the present invention - creation. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention - creation are within the scope of protection of the pending claims of the present invention - creation.

Claims

1. A semi-rigid pavement base repair method, characterized in that, The repair method includes the following steps: Step 1: Determine the location and area of the pavement base course diseases, and mark the boundaries of the potholes. Step 2: Milling out the potholes according to the boundaries of the potholes, and recycling the milled materials; T-shaped grooves are arranged at both positions corresponding to the two ends of the prestressed tendons in the potholes. The T-shaped grooves include a transverse groove and a longitudinal groove. The transverse groove is perpendicular to the longitudinal groove. One end of the transverse groove communicates with the middle of the longitudinal groove, and the other end of the transverse groove communicates with the pothole. Step 3: Lay a plurality of prestressed components at the bottom of the pothole. The prestressed components are arranged longitudinally along the road. Each prestressed component includes at least one prestressed tendon; the prestressed component further includes a support plate and a tensioning nut; the threaded end of the prestressed tendon is located in the T-shaped groove, and the support plate is erected on the side of the longitudinal groove facing the transverse groove. Step 4: Tension each prestressed tendon; erect formworks on both sides of the prestressed component, and pour cement concrete in the formworks to keep the prestressed tendons in a tensioned state. After the cement concrete solidifies to the set strength, remove the formworks. Step 5: Lay rubble around the prestressed components in the pothole. Step 6: Lay a voltage equalizing net on the rubble and the prestressed components. Step 7: Backfill the pothole with asphalt concrete admixed with recycled asphalt surface course milled materials. Step 8: Roll the asphalt concrete in the pothole flat. Step 9: After the compacted asphalt concrete cools to normal temperature, complete the repair operation. Both ends of the prestressed tendon are threaded ends, and external threads are provided on both threaded ends. A tensioning nut is threadedly connected to the threaded end of each prestressed tendon. Inside each tensioning nut, it abuts against a support plate. The prestressed component further includes a steel reinforcement cage. The prestressed tendon passes through the center of the steel reinforcement cage, and the steel reinforcement cage is located between the two support plates.

2. The semi-rigid pavement base repair method according to claim 1, characterized in that, In Step 2, first mill the asphalt surface course for the first time, and collect the milled asphalt for recycling. Then adjust the milling thickness, and mill the cement stabilized macadam base course under the milled asphalt surface course for the second time, and collect the milled macadam for recycling; the thickness of the second milling is less than the original thickness of the cement stabilized macadam base course.

3. The semi-rigid pavement base repair method according to claim 2, characterized in that, In Step 5, the thickness of the rubble is less than the original thickness of the cement stabilized macadam base course. The rubble has no less than five faces, and the largest plane of the rubble is placed downward.

4. The semi-rigid pavement base repair method according to claim 3, characterized in that, In Step 7, before backfilling the pothole with asphalt concrete, first spray tack coat on the side and top surfaces of the cement concrete of the prestressed component, and spray emulsified asphalt penetration coat on the remaining parts in the pothole.

5. The semi-rigid pavement base repair method according to claim 4, characterized in that, In Step 7, backfill the pothole with coarse-grained asphalt concrete admixed with recycled asphalt surface course milled materials, and perform initial compaction on the asphalt concrete. The asphalt concrete after initial compaction is higher than the top surface of the original cement stabilized macadam base course around the pothole.

6. The semi-rigid pavement base repair method according to claim 5, wherein, Perform multiple repeated rolling on the asphalt concrete until the asphalt concrete meets the design compaction degree requirements.

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