Semi-rigid pavement base layer repairing method

Abstract

The invention belongs to the technical field of road maintenance and repair, and particularly relates to a semi-rigid pavement base repairing method. The repairing method comprises the following steps: step 1, marking the boundary of the pit slot; step 2, milling a pit slot; 3, a plurality of prestress assemblies are laid at the bottom of the pit slot, the prestress assemblies are arranged in the longitudinal direction of the road, and each prestress assembly comprises a prestress rib; (4) each prestressed tendon is tensioned; formworks are erected on the two sides of the prestress assembly, cement concrete is poured, and after the cement concrete is solidified to the set strength, the formworks are removed; step 5, paving rubbles around the prestressed component in the pit slot; 6, a pressure equalizing net is laid on the rubbles and the prestress assemblies; 7, the pit slot is backfilled with asphalt concrete; 8, the asphalt concrete in the pit slot is ground to be flat; and 9, after the asphalt concrete is cooled, repairing operation is completed. The repairing method has good comprehensive social benefits and economic benefits.

Description

Technical Field

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

[0002] With the rapid development of social economy, urban construction is changing with each passing day, and roads are extending in all directions, which greatly facilitates the production, work and life needs of enterprises, businesses and the people. At the same time, the general trunk road network is becoming more and more complete, logistics and transportation and people's travel are more convenient, which has promoted the vigorous development of the road economy. The urbanization on both sides of the general roads has sprung up, which has also injected strong vitality into the further development of the local economy. However, on the one hand, the residential houses around urban roads are densely distributed; on the other hand, urbanization continues to emerge on both sides of the general trunk roads; and on the other hand, in the process of connecting all towns and villages with roads, low-grade roads such as county roads and village roads are built with towns and villages as important nodes, and it is common to pass through villages and towns.

[0003] Roads have been built to the doorsteps of people's homes, facilitating people's travel and logistics transportation. However, as the service life of roads increases, diseases and damages gradually appear. When the service life of roads is reached, renovation and reconstruction are imperative, and at this time, contradictions and problems also appear. In road construction, especially in the process of repairing semi-rigid pavement base, in order to ensure the strength of the pavement base, the asphalt layer and cement-stabilized gravel base at the damaged position of the pavement are usually excavated first, and then the cement-stabilized gravel base material is backfilled and impact-vibrated compacted, and finally asphalt concrete is backfilled and compacted; and in the process of impact-vibration rolling by heavy rollers, strong earthquakes will have a certain impact on surrounding buildings, or even damage them. Therefore, the built roads are generally repaired and renovated in the sections through villages and towns, especially when the houses on both sides of the road are old and the safety factor is low, which brings great inconvenience and difficulty to conventional road construction.

[0004] Therefore, it is necessary to provide an improved technical solution to address the above-mentioned deficiencies in the prior art. Summary of the invention

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

[0006] In order to achieve the above object, the present invention provides the following technical solutions: A semi-rigid pavement base repair method, the repair method comprising the following steps: Step 1: determine the location and area of ​​the pavement base disease and mark the boundaries of the potholes; Step 2, according to the boundary of the pit, the pit is milled out, and the milled material is recycled; the pit is provided with T-slots at both ends of the prestressed tendons corresponding to the prestressed tendons, and the T-slots include a transverse groove and a longitudinal groove, the transverse groove is perpendicular to the longitudinal groove, one end of the transverse groove is connected to the middle of the longitudinal groove, and the other end of the transverse brace is connected to the pit; Step 3, laying a plurality of prestressed components at the bottom of the pothole, wherein the prestressed components are arranged along the longitudinal direction of the road, and each prestressed component includes at least one prestressed tendon; the prestressed components also include a support plate and a tensioning nut; the threaded end of the prestressed tendon is located in the T-slot, and the support plate is mounted on the side of the longitudinal slot facing the transverse slot; Step 4, tensioning each prestressed tendon; setting up formwork on both sides of the prestressed component, and pouring cement concrete in the formwork to keep the prestressed tendons in a tensioned state, and removing the formwork after the cement concrete solidifies to a set strength; Step 5, laying stone slabs around the prestressed components in the pit; Step 6, laying a pressure equalizing net on the stone sheets and prestressed components; Step 7, backfilling the pit with asphalt concrete mixed with recycled asphalt surface milling material; Step 8, rolling the asphalt concrete in the pit to make it smooth; Step 9: After the compacted asphalt concrete cools to room temperature, the repair work is completed.

[0007] In the semi-rigid pavement base repair method as described above, preferably, both ends of the prestressed tendons are threaded ends, both threaded ends are provided with external threads, each threaded end of the prestressed tendons is threadedly connected to a tensioning nut, and the inner side of each tensioning nut is abutted against a support plate.

[0008] In the semi-rigid pavement base repair method as described above, preferably, the prestressed component also includes a steel cage, the prestressed tendons pass through the center of the steel cage, and the steel cage is located between two support plates.

[0009] In the above-mentioned semi-rigid pavement base repair method, preferably, in step 2, the asphalt surface layer is first milled, and the milled asphalt is collected for recycling; Then adjust the milling thickness, perform a second milling on the cement stabilized gravel base layer below the milled asphalt surface layer, and collect the milled gravel for recycling; the second milling thickness is less than the original cement stabilized gravel base thickness.

[0010] 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, the rubble has no less than five surfaces, and the largest plane of the rubble is placed downward.

[0011] 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 on the side and top surfaces of the cement concrete of the prestressed component, and spray emulsified asphalt prime coat on the remaining parts in the pothole.

[0012] For the semi-rigid pavement base repair method as described above, preferably, in step 7, backfill the pothole with coarse-grained asphalt concrete admixed with recycled asphalt surface milling 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 around the pothole.

[0013] 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.

[0014] Beneficial effects: In this repair method, by setting a prestressed component in the pothole, the prestressed component after tensioning has greater load-bearing capacity, which can greatly improve the load-bearing capacity of the renovated road and avoid the situation that the repaired position is repeatedly damaged due to large stress.

[0015] This application uses the mutual cooperation of prestressed components and rubble to replace the original semi-rigid cement stabilized macadam base. Among them, the prestressed component 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, ensuring that the repaired road has a longer service life and lower later maintenance costs, greatly reducing the maintenance costs during the whole life cycle of the road, also reducing the number of road repairs and the closed traffic time; and the whole repair process does not require strong impact vibration rolling construction operations, greatly reducing the impact on the surrounding buildings of the road; and in this repair method, through the recycling and reuse of milling materials, 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

[0016] The specification drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. Among them: Figure 1 It is a top view of a pothole in an embodiment of the present invention. Figure 2A cross-sectional view of the location of a prestressing assembly in a pit to create one embodiment of the present invention; Figure 3 A cross-sectional view of the location of a sheet of stone in a pit to create one embodiment of the present invention.

[0017] In the figure: 1. Groove; 2. T-slot; 3. Prestressed component; 31. Prestressed tendons; 32. Support plate; 33. Tension nut; 34. Steel cage; 4. Stone sheet; 5. Equalizing net; 6. Asphalt concrete. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0019] In the description of the present invention, the terms "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention. The terms "connected" and "connected" used in the present invention should be understood in a broad sense. For example, they can be fixedly connected or detachably connected; they can be directly connected or indirectly connected through intermediate components. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0020] The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict.

[0021] According to the specific embodiments of the present invention, Figure 1-3 As shown, the present invention provides a semi-rigid pavement base repair method, the repair method comprising the following steps: Step 1, determine the location and area of ​​the road base disease and mark the boundary of the pothole 1; In this embodiment, in step 1, construction preparation is first performed, which specifically includes the following contents: 1. Prepare asphalt mixture, emulsified asphalt, block stone, steel bar materials, geogrid, etc. that meet the quality requirements.

[0022] 2. Prepare construction machinery and equipment such as milling machines, skid sweepers, blowers, asphalt spreaders, loaders, graders, double steel wheel light vibratory rollers, and rubber wheel rollers.

[0023] 3. Determine the scope of pothole 1: Based on the road deflection detection data and on-site investigation, determine the location and area of ​​the road base disease. According to the principle of round potholes and square filling, mark the boundary of pothole 1 perpendicular or parallel to the center line of the road. The marking range should be 40 to 50 cm wider than the actual edge of pothole 1.

[0024] 4. Carry out traffic control on the construction section, set up warning signs and fences, and guide vehicles and pedestrians to detour.

[0025] Step 2, milling out the pit 1 according to the boundary of the pit 1, and recycling the milled material; Step 3, laying a plurality of prestressed components 3 at the bottom of the pit 1, wherein the prestressed components 3 are arranged along the longitudinal direction of the road, and each prestressed component 3 includes at least one prestressed tendon 31; Step 4, tensioning each prestressed tendon 31; setting up formwork on both sides of the prestressed component 3, and pouring cement concrete in the formwork to keep the prestressed tendon 31 in a tensioned state, and removing the formwork after the cement concrete solidifies to a set strength; Step 5, laying stone sheets 4 around the prestressed component 3 in the pit 1; Step 6, laying a pressure-equalizing net 5 on the stone sheet 4 and the prestressed component 3; in the present embodiment, the prestressed component 3 and the stone sheet 4 are close in height, and the pressure-equalizing net 5 can better disperse the load force exerted on the asphalt concrete 6 to the prestressed component 3 and the stone sheet 4, so that the prestressed component 3 and the stone sheet 4 can better play their bearing role; and the pressure-equalizing net 5 can also effectively prevent or mitigate the reflective cracks caused by the junction of the prestressed cement concrete and the asphalt concrete 6, thereby extending the service life of the road.

[0026] In this embodiment, the pressure equalizing net 5 can adopt a geogrid or a steel mesh structure, wherein the geogrid is corrosion-resistant, has a long service life, and is low in cost, and has the advantages of convenient and fast construction, short cycle, and low construction cost.

[0027] The steel mesh is composed of multiple transverse steel bars and multiple longitudinal steel bars. It has high strength, but high cost. There is no restriction on the spacing between the transverse steel bars and the longitudinal steel bars in the steel mesh. The spacing between the transverse steel bars and the longitudinal steel bars can be selected according to the actual on-site construction needs.

[0028] Step 7, backfilling the pit 1 with asphalt concrete 6 mixed with recycled asphalt surface milling material; Step 8, rolling the asphalt concrete 6 in the pit 1 to make it smooth; Step 9, after the compacted asphalt concrete 6 cools down to room temperature, the repair work is completed.

[0029] Since the damaged parts of the road are often located at locations with greater stress, such as areas where medium and large buses or trucks often pass by, only using general repair methods can only ensure the smoothness of the road for a short period of time. Over time, these road damaged parts will be damaged repeatedly, which requires repeated repairs of these road damaged parts, greatly affecting the road's traffic efficiency.

[0030] In the repair method, after a groove 1 is milled out at the road surface defect, a plurality of prestressed components 3 are first laid in the groove 1, and the prestressed components 3 are extended along the longitudinal direction of the road; then, after the prestressed tendons 31 in the prestressed components 3 are tensioned, cement concrete is poured in the prestressed components 3 to keep the prestressed tendons 31 in their tensioned state; by arranging the prestressed components 3 in the groove 1, the tensioned prestressed components 3 have a greater load-bearing capacity, which can greatly improve the load-bearing capacity of the modified road, and avoid repeated damage to the repaired position due to large force.

[0031] In addition, after the construction of the prestressed component 3 is completed, in the pit 1, stone pieces 4 are laid around the prestressed component 3, each of the stone pieces 4 has a good load-bearing capacity, and the laid multiple stone pieces 4 are evenly distributed in the pit 1, and the laid stone pieces 4 layer has a good semi-rigid performance.

[0032] That is, the present application adopts the cooperation between the prestressed component 3 and the stone 4 to replace the original semi-rigid cement-stabilized gravel base, wherein the prestressed component 3 after tensioning can provide a greater bearing capacity, and the scattered stone 4 structure can better simulate the elastic modulus of the semi-rigid cement-stabilized gravel base, ensuring that the repaired road has a longer life and lower subsequent maintenance costs, greatly reducing the maintenance cost of the road throughout its life cycle, reducing the number of road repairs, and reducing the time of traffic closures; and the entire repair process does not require strong impact vibration rolling construction operations, greatly reducing the impact on buildings around the road, so that the repair method has better comprehensive social and economic benefits.

[0033] The prestressed component 3 further includes a support plate 32 and a tensioning nut 33 .

[0034] Both ends of the prestressed tendon 31 are threaded ends, and both threaded ends are provided with external threads. A tensioning nut 33 is threadedly connected to the threaded end of each prestressed tendon 31, and a support plate 32 is abutted on the inner side of each tensioning nut 33.

[0035] In one embodiment of the present application, each prestressed component 3 includes a prestressed tendon 31, two support plates 32 and two tensioning nuts 33. A through hole is set in the center of each support plate 32. The threaded end of the prestressed tendon 31 first passes through the through hole in the center of the support plate 32, and then the tensioning nut 33 is screwed on the threaded end of the prestressed tendon 31. The prestressed tendon 31 can be tensioned by rotating the tensioning nut 33. Such a configuration makes the prestressed component 3 more convenient to use, thereby facilitating its application in road repair operations.

[0036] The prestressed component 3 further includes a steel cage 34 , through which the prestressed tendons 31 pass, and the steel cage 34 is located between the two support plates 32 .

[0037] In one embodiment of the present application, in step 4, formwork is set up on both sides of the steel cage 34, and after the steel cage 34 is enclosed by the formwork on both sides and two support plates 32, cement concrete is poured into the formwork, and the prestressed component 3 with the steel cage 34 is set. After pouring the concrete, it has better structural strength, which can enable the prestressed tendons 31 in the prestressed component 3 to exert better prestressed tensioning effect, thereby ensuring that the prestressed component 3 has a greater bearing capacity.

[0038] T-slots 2 are provided at both ends of the pit 1 corresponding to the prestressed tendons 31 . The T-slots 2 include a transverse groove and a longitudinal groove. The transverse groove is perpendicular to the longitudinal groove. One end of the transverse groove is connected to the middle of the longitudinal groove, and the other end of the transverse brace is connected to the pit 1 .

[0039] The threaded end of the prestressed tendon 31 is located in the T-shaped slot 2, and the support plate 32 is mounted on the side of the longitudinal slot facing the transverse slot.

[0040] In one embodiment of the present application, after the prestressed component 3 is laid in the pit 1, the threaded ends of the prestressed tendons 31 are respectively located in the T-slots 2 on both sides of the pit 1; the support plate 32 is mounted on the 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 cage 34, so that the support plate 32 is not in direct contact with the steel cage 34, that is, the longitudinal groove supports the support plate 32 at this time, thereby preventing the support plate 32 from transmitting the force applied to the steel cage 34, thereby preventing the steel cage 34 from being deformed due to the large force.

[0041] Among them, when the prestressed tendon 31 is tensioned, since a larger tensioning equipment cannot be placed in the pit 1; at this time, the tensioning nuts 33 at both ends of the prestressed tendon 31 are rotated to gradually tension the prestressed tendon 31; the tensioning method of the tensioning nut 33 is selected to be relatively simple to operate, and is more convenient for use in pavement base repair operations; and this repair method is mainly for semi-rigid pavement bases, that is, the prestressed tendon 31 does not require a particularly large tensioning stress, and the tensioning stress of the prestressed tendon 31 in this repair method only needs to meet the use requirements of the semi-rigid pavement base.

[0042] In step 2, the asphalt surface layer is milled for the first time, and the milled asphalt is collected for recycling; then the milling thickness is adjusted, and the cement-stabilized gravel base layer under the milled asphalt surface layer is milled for the second time, and the milled gravel is collected for recycling; the second milling thickness is less than the original cement-stabilized gravel base thickness.

[0043] In one embodiment of the present application, when the asphalt surface layer is milled for the first time, the range of the first milling is 40 to 50 cm wider than the four edges of the marked pits; after the asphalt surface layer milling machine is finished, the pit disease condition is observed again. When the disease changes from the aforementioned investigation results, the location and area of ​​the disease are further corrected. When the change is not large, the milling width and thickness are adjusted, and the width is about 30 cm inward on the base of the original milled asphalt surface layer; that is, when the cement-stabilized gravel base is milled for the second time, the second milling range is 10 to 20 cm wider than the four edges of the marked pits; so that the four edges of the first milling range are 30 to 40 cm wider than the four edges of the second milling range; that is, a step of about 30CM wide is formed between the four edges of the milled asphalt surface layer and the cement-stabilized gravel base.

[0044] In one embodiment of the present application, the milling thickness of the milling machine is adjusted according to the investigated asphalt surface thickness, and the damaged asphalt surface is milled for the first time at the marked pothole 1 position. The milled asphalt mixture is directly transported to the dump truck compartment and transported to the set location by the dump truck for further recycling.

[0045] After the asphalt surface milling machine is finished, adjust the milling thickness, and perform a second milling on the cement-stabilized gravel base under the milled asphalt surface layer. Control the milling thickness. The second milling thickness is set to be 0.2-0.3cm less than the cement-stabilized gravel base, and try not to damage the underlying layer. The milled cement-stabilized gravel mixture is transported to the set location by a dump truck for further recycling. The asphalt mixture and cement-stabilized gravel mixture are stacked separately and classified for use.

[0046] After the milling operation is completed, the pit 1 is cleaned with a skid sweeper to clean the cement-stabilized gravel base attached to the lower bearing layer. After the cleaning is completed, the floating dust in the pit 1 is further cleaned with a blower to ensure that the pit 1 is clean and free of loose dust.

[0047] In step 5, the thickness of the stone 4 is less than the thickness of the original cement-stabilized crushed stone base layer, the stone 4 has no less than five sides, and the largest plane of the stone 4 is placed downward.

[0048] In one embodiment of the present application, artificial paving of stone 4 is adopted; the prepared block stone 4 is evenly stacked at the bottom of the pit 1, and the spacing between adjacent stone 4 ranges from 3 to 6 cm. The block stone 4 has no less than 5 faces, among which the contact face with the bottom of the pit 1 is guaranteed to be flat and no less than the area of ​​the other faces, so as to ensure the stable stacking. The top surface of the stacked block stone 4 has a certain area and is basically guaranteed to be level. The thickness of the selected block stone is generally 14 to 17 cm, and is less than 2 to 3 cm thick of the cement stabilized gravel base layer. For stones whose size does not meet the requirements, a small crusher is used for further crushing, and those that do not meet the requirements are not allowed to be used. The raw materials should be selected as much as possible from the mountain bluestone with edges and corners, good embedding properties, no impurities, good texture and hardness.

[0049] In step 7, before backfilling the asphalt concrete 6 in the pit 1, the cement concrete side and top surface of the prestressed component 3 are sprayed with adhesive layer oil, and the rest of the pit 1 is sprayed with emulsified asphalt penetration oil. In one embodiment of the present application, an asphalt distributor is used to spray the emulsified asphalt penetration oil into the pit 1, and the asphalt dosage is not less than 1.5L / m 2 And ensure that the blocky stone 4 is evenly wrapped except for the bottom surface, and artificially sprinkle any white spots. The parts that are not covered with blocky stone 4 should be fully sprayed in place, and the depth of the emulsified asphalt penetration oil penetrating into the bottom of the pit 1 is not less than 5mm. Emulsified asphalt penetration oil is also evenly sprayed on the side walls of the pit 1, and the penetration oil penetrates into the side walls to a depth of not less than 5mm to enhance the bonding force between the new and old road surfaces. In addition, spray the adhesive layer oil on the cement concrete side and top surface of the prestressed component 3 to enhance the bonding effect between the cement concrete surface and the asphalt concrete 6.

[0050] In step 7 , the coarse-grained asphalt concrete 6 mixed with recycled asphalt surface milling material is backfilled into the pit 1 , and the asphalt concrete 6 is initially compacted. The asphalt concrete 6 after the initial compaction is higher than the original cement-stabilized gravel base pavement outside the pit 1 .

[0051] In one embodiment of the present application, 10-20% of recycled asphalt surface milling material is mixed into the coarse-grained asphalt concrete 6. By recycling and reusing the milling material, not only can the construction cost be saved to a certain extent, but it is also more conducive to environmental protection.

[0052] In one embodiment of the present application, after the emulsified asphalt penetration oil is demulsified, the water evaporates and the molding is stable, the asphalt concrete 6 is paved, and the asphalt concrete 6 is AC-25C coarse-grained asphalt concrete 6. The asphalt concrete 6 is transported to the outside of the pit 1 by a dump truck, and the dump truck reverses parallel to the center line of the road. When the rear wheel is 20 to 30 cm away from the edge of the pit 1 and is in the middle of the pit 1, the truck stops to prevent the wheel from damaging the side wall of the pit 1.

[0053] Before unloading, check that there are no people or obstacles above and around. Lift the carriage, calculate the amount of asphalt concrete 6 according to the area of ​​the pit 1 and the influence range of the dump truck unloading, and stop lifting and start unloading when the carriage is lifted to a certain angle and the unloaded asphalt concrete 6 meets the influence range of the vehicle's position. After unloading, move the car slightly forward to allow the asphalt concrete 6 to completely fill the outer edge of the pit 1, reset the carriage, lock the tilt operating lever, and the vehicle drives out of the construction area. The loader enters the construction area, and the loader pushes the asphalt concrete 6 mixture unloaded into the pit 1 into the pit 1. When pushing the material, the two-time push method is used to reduce the overflow of asphalt concrete 6 into the pit 1. During the first push, the bucket is parallel to the center line of the pit 1, and one side of the bucket is flush with the center line; the other side of the bucket is outside the pit 1 and parallel to the outer edge of the pit 1. Use the loader for rough leveling. After the rough leveling of half width is completed, the construction of the other half of the pit 1 begins. During the second push, the bucket is parallel to the center line of the pit 1, with one side slightly exceeding the center line, to ensure that the asphalt concrete 6 mixture left on the other side of the center line during the first push is also spread in the pit 1. Use a loader for rough leveling, and basically ensure that the asphalt concrete 6 in the entire pit 1 is on a horizontal surface, and is 2 to 3 cm higher than the top surface of the base. After the loader completes the rough leveling, use a grader to further level the asphalt concrete 6 in the pit 1. When the asphalt concrete 6 is unevenly spread, the asphalt concrete 6 is dug and supplemented manually with the grader. During the leveling process, use the grader tire to perform an initial pressure on the mixture. After the initial pressure is completed, the asphalt concrete 6 mixture in the pit 1 is 1 to 2 cm higher than the top surface of the base.

[0054] When the entire pit 1 is not completed in the first paving, after the loader and the grader have leveled and preliminarily compacted it, the dump truck loaded with asphalt concrete 6 is driven into the pit 1 after the asphalt concrete 6 has been paved and roughly preliminarily compacted, and the aforementioned process is repeated until the entire pit 1 is filled. If the operation is repeated for many times, the grader will finally level and preliminarily compact the entire pit 1. After the preliminarily compacted process, the asphalt concrete 6 in the pit 1 is 1 to 2 cm higher than the top surface of the original cement-stabilized crushed stone base.

[0055] The asphalt concrete 6 is repeatedly rolled several times until the asphalt concrete 6 reaches the designed compaction requirement. In one embodiment of the present application, the initial compaction is performed by a light vibrating roller with double steel wheels from the edge of the pit 1 to the middle, and the roller's rolling speed should be uniform, and the initial compaction speed is preferably 2 to 3 km / h, and the compaction is performed three times.

[0056] The re-compaction is carried out immediately after the initial compaction. The re-compaction is carried out with a rubber-wheel roller at a rolling speed of 2 to 4 km / h, and it is rolled 4 times until the required compaction degree is reached and there are no obvious wheel marks.

[0057] The final compaction is carried out immediately after the re-compacting. After the re-compacting is completed, a vibratory roller is used for compaction at a speed of 2 to 4 km / h, and the compaction is carried out 1 to 2 times until there are no wheel marks left.

[0058] In this embodiment, the asphalt concrete 6 after final compaction is flush with the top surface of the original cement-stabilized gravel base layer; then a layer of asphalt surface layer is constructed on top of the asphalt concrete 6 after final compaction, and the final constructed asphalt surface layer is flush with the original asphalt surface layer around the pit. After the asphalt surface layer is constructed, the construction signs are removed and traffic is opened.

[0059] It should be understood that the above description is merely exemplary and the embodiments of the present application do not limit this.

[0060] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention are within the scope of protection of the pending claims of the present invention.

Claims

1. A semi-rigid pavement base repair method, characterized in that: The repair method comprises the following steps: Step 1: determine the location and area of ​​the pavement base disease and mark the boundaries of the potholes; Step 2, according to the boundary of the pit, the pit is milled out, and the milled material is recycled; the pit is provided with T-slots at both ends of the prestressed tendons corresponding to the prestressed tendons, and the T-slots include a transverse groove and a longitudinal groove, the transverse groove is perpendicular to the longitudinal groove, one end of the transverse groove is connected to the middle of the longitudinal groove, and the other end of the transverse brace is connected to the pit; Step 3, laying a plurality of prestressed components at the bottom of the pothole, wherein the prestressed components are arranged along the longitudinal direction of the road, and each prestressed component includes at least one prestressed tendon; the prestressed components also include a support plate and a tensioning nut; the threaded end of the prestressed tendon is located in the T-slot, and the support plate is mounted on the side of the longitudinal slot facing the transverse slot; Step 4, tensioning each prestressed tendon; setting up formwork on both sides of the prestressed component, and pouring cement concrete in the formwork to keep the prestressed tendons in a tensioned state, and removing the formwork after the cement concrete solidifies to a set strength; Step 5, laying stone slabs around the prestressed components in the pit; Step 6, laying a pressure equalizing net on the stone sheets and prestressed components; Step 7, backfilling the pit with asphalt concrete mixed with recycled asphalt surface milling material; Step 8, rolling the asphalt concrete in the pit to make it smooth; Step 9: After the compacted asphalt concrete cools to room temperature, the repair work is completed.

2. The semi-rigid pavement base repair method according to claim 1, characterized in that: Both ends of the prestressed tendon are threaded ends, both threaded ends are provided with external threads, and each threaded end of the prestressed tendon is threadedly connected to a tensioning nut, and the inner side of each tensioning nut is abutted against a support plate.

3. The semi-rigid pavement base repair method according to claim 2, characterized in that: The prestressed component also includes a steel cage, the prestressed tendons pass through the center of the steel cage, and the steel cage is located between two support plates.

4. The semi-rigid pavement base repair method according to claim 3, characterized in that: In step 2, the asphalt surface layer is first milled, and the milled asphalt is collected for recycling; Then adjust the milling thickness, perform a second milling on the cement stabilized gravel base layer below the milled asphalt surface layer, and collect the milled gravel for recycling; the second milling thickness is less than the original cement stabilized gravel base thickness.

5. The semi-rigid pavement base repair method according to claim 4, characterized in that: In step 5, the thickness of the stone pieces is less than the thickness of the original cement-stabilized crushed stone base layer, the stone pieces have no less than five sides, and the largest plane of the stone pieces is placed downward.

6. The semi-rigid pavement base repair method according to claim 5, characterized in that: In step 7, before backfilling the pit with asphalt concrete, first spray adhesive layer oil on the cement concrete side and top surface of the prestressed component, and spray emulsified asphalt penetration oil on the rest of the pit.

7. The semi-rigid pavement base repair method according to claim 6, characterized in that: In step 7, the pit is backfilled with coarse-grained asphalt concrete mixed with recycled asphalt surface milling material, and the asphalt concrete is initially compacted. The asphalt concrete after the initial compaction is higher than the top surface of the original cement-stabilized crushed stone base layer around the pit.

8. The semi-rigid pavement base repair method according to claim 7, characterized in that: The asphalt concrete is rolled repeatedly until the asphalt concrete reaches the designed compaction requirement.

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