A repair material, apparatus and method for asphalt pavement distresses

Abstract

This invention discloses a repair material, device, and method for localized subsidence of asphalt pavement. The device utilizes elevation control and leveling devices positioned at the four corners of a guide rail system to control and adjust the elevation of the device. Furthermore, a horizontal telescopic device and a telescopic sliding mechanism are used to adjust the range of motion of the mixing and paving system in the horizontal plane. This allows the device to be adjusted in the X, Y, and Z directions, achieving the purpose of mixing, paving, and leveling the repair material within the localized subsidence area of ​​the asphalt pavement. Simultaneously, the repair method provided by this invention avoids the difficulties in compacting hot-mix asphalt mixtures in small areas and the problem of uneven connection with existing pavements. Moreover, the repair material provided by this invention avoids the energy waste caused by heating hot-mix asphalt mixtures, thus preventing significant reductions in compaction efficiency.

Description

Technical Field

[0001] This invention relates to the field of asphalt pavement subsidence repair technology, specifically to a repair material, device, and method for localized subsidence damage in asphalt pavements. Background Technology

[0002] With the rapid development of economy and technology, my country's total highway mileage ranks among the world's top, and its total expressway mileage ranks first globally. Faced with this vast highway system, highway maintenance is of paramount importance. During long-term service, asphalt pavements often develop various defects, among which pavement subsidence is a common phenomenon, particularly noticeable at bridge approach points. If not addressed promptly, it can significantly impact driving comfort. Traditional repair methods involve milling the pavement surface and repaving with hot-mix asphalt, followed by compaction. However, this method has several shortcomings: First, the workable area at subsided locations is usually small, making compaction difficult. Additionally, pavers and rollers are often difficult to access, increasing the operational complexity. Second, even after treatment, a smooth transition to the existing pavement is challenging, ensuring consistent flatness. Third, the amount of hot-mix asphalt required for small-scale subsidence repairs is limited, making mixing at a mixing plant impractical. Furthermore, the temperature of the asphalt mixture can drop continuously during long-distance transportation, making it difficult to compact after paving at the site, resulting in a significant reduction in construction efficiency. Finally, asphalt mixing plants are usually located far from the construction site, leading to high transportation costs. Heating the asphalt mixture also consumes a lot of energy, increasing carbon dioxide emissions and hindering the achievement of "dual carbon" targets.

[0003] Therefore, it is essential to develop a material and device that can repair road subsidence at room temperature without the need for compaction. Summary of the Invention

[0004] The purpose of this invention is to provide a repair material, device, and method for localized subsidence of asphalt pavement. The repair material is mixed, spread, and leveled within the localized subsidence area of ​​the asphalt pavement, ensuring the smoothness of the pavement after repair. At the same time, it avoids the construction process of hot-mix asphalt mixture, which is difficult to compact in small areas, and the phenomenon that it is not easy to smoothly connect with the existing pavement. It not only reduces the cost of highway maintenance but also improves the efficiency of maintenance work.

[0005] To achieve the above-mentioned technical objectives, the present invention is implemented through the following technical solution:

[0006] A repair device for localized subsidence of asphalt pavement includes a mixing and paving system and a guide rail system.

[0007] The guide rail system includes guide rail beams arranged opposite each other and horizontal telescopic devices arranged opposite each other. The guide rail beams and horizontal telescopic devices arranged opposite each other form a rectangular frame. Elevation control and leveling devices are provided at the four corners of the rectangular frame.

[0008] The mixing and paving system includes a feeding device, a mixing device, and a leveling device that are connected vertically from top to bottom. The two ends of the mixing device are connected to the guide beam through a telescopic sliding mechanism. The mixing and paving system slides along the length or width of the rectangular frame under the drive of the telescopic sliding mechanism.

[0009] In this scheme, the repair device uses elevation control and leveling devices set at the four corners of the guide rail system to control the elevation of the adjustment device, thereby controlling the range of horizontal paving direction. The adjustment stops when the two ends of the leveling device contact the two ends of the original ground. In addition, the repair device also uses a horizontal telescopic device and a telescopic sliding mechanism to adjust the range of movement of the mixing and paving system in the horizontal plane, so as to achieve the purpose of mixing, paving and leveling the repair material within the local subsidence area of ​​the asphalt pavement, ensuring the smoothness of the pavement after local subsidence repair.

[0010] As a further technical solution of the repair device, the mixing device includes a spiral mixing rod, a mixing container and an engine. The mixing container can extend and retract from both ends to the middle along the width direction perpendicular to the rectangular frame. The spiral mixing rod rotates in the mixing container under the drive of the engine, and the repair material is evenly conveyed to both ends of the mixing container.

[0011] In this scheme, the mixing container is made of aluminum alloy and is used to load the repair material. It can extend and retract from both ends to the middle in the width direction perpendicular to the rectangular frame, thereby further controlling the paving range. Moreover, the spiral mixing blades set on the outside of the spiral mixing rod can not only transport the repair material to both ends of the mixing container, but also uniformly mix the repair material.

[0012] As a further technical solution of the repair device, the telescopic sliding mechanism includes a power unit and multiple guide wheels, and the mixing device includes a mixing container;

[0013] The power unit is fixedly connected to the rectangular frame, the output end of the power unit is connected to the mixing container, and the output direction of the power unit is parallel to the length direction of the rectangular frame.

[0014] The mixing container can extend and retract from both ends toward the middle along the width direction perpendicular to the rectangular frame. The two ends of the mixing container are respectively inserted through the oppositely arranged guide rail beams, and a plurality of guide wheels are arranged between the mixing container and the through wall of the guide rail beams.

[0015] In this scheme, the guide beam is an I-beam, and the two ends of the mixing container are respectively inserted through the opposite guide beam. The guide wheel is set between the wall of the mixing container and the guide beam. Through the combination of the guide wheel and the guide beam track, the mixing and paving system can slide smoothly along the paving direction of the repair material.

[0016] As a further technical solution of the repair device, a pull-out isolation plate and a weighing sensor are provided at the outlet of the feeding device, and the weighing sensor is electrically connected to the pull-out isolation plate.

[0017] In this scheme, the weighing sensor can be a planar diaphragm type force sensor with a range of 1t and an operating temperature of -20℃ to 80℃, which is used for weighing the repair materials.

[0018] As a further technical solution of the repair device, in order to allow the repair material sufficient time to be stirred in the mixing container, the inner wall of the mixing container is provided with a sealing strip when in standby mode, so as to prevent the repair material from leaking into the subsidence area after the machine is turned on without being stirred evenly.

[0019] The repair material used in one of the above-mentioned technical solutions for repairing localized subsidence damage in asphalt pavements is prepared from the following components in parts by weight:

[0020] 10-12 parts of styrene-butadiene copolymer modified emulsified asphalt;

[0021] 95-100 parts of ore;

[0022] 7-10 parts water;

[0023] 1-3 parts cement;

[0024] The styrene-butadiene copolymer modified emulsified asphalt is of type BCR, and its evaporation residue is not less than 62%.

[0025] The ore is basalt or diabase;

[0026] The cement is PO 42.5 ordinary Portland cement;

[0027] The water is purified water and meets or exceeds Class III water quality standards.

[0028] The method for preparing the repair material is as follows: first, mix cement and mineral materials, then add water, and finally add styrene-butadiene copolymer modified emulsified asphalt to mix it evenly at room temperature.

[0029] The repair device and repair materials in the above technical solution for repairing asphalt pavements include the following steps:

[0030] S1. Clean the existing road surface subsidence area and its surroundings, and move the repair device to the local subsidence area of ​​the asphalt road surface;

[0031] S2. Adjust the horizontal paving direction of the horizontal expansion joint and guide beam according to the size and range of the settlement area, and make the paving direction perpendicular to the center line of the road.

[0032] S3. Select five sections at the road surface subsidence location, use a three-meter straightedge to find the starting position of subsidence at each section, and use the distance from the starting position of subsidence at each section to the farthest point, extending 30-50cm to the left and right, as the reference position for placing the leveling device.

[0033] S4. Adjust the elevation of the elevation control leveling device and the leveling device according to the cross slope of the road and the depth of the settlement, so that the two ends of the equipment leveling device are in close contact with the two ends of the largest left and right distance of the settlement, and the close contact range must extend 30-50cm beyond each end of the settlement.

[0034] S5. Calculate the required mass of repair materials based on the extent of local subsidence;

[0035] S6. Mix the repair material prepared in step S5 evenly;

[0036] S7. The mixing and paving system begins to advance, and both ends of the mixing and paving system move forward completely. After the subsided area is paved and smoothed, the device is shut off to make the subsided repair area smoothly connected to the existing road surface.

[0037] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0038] This invention provides a repair device for localized subsidence of asphalt pavement. It uses elevation control and leveling devices at the four corners of a guide rail system to control and adjust the elevation of the device. Furthermore, it employs a horizontal telescopic device and a telescopic sliding mechanism to adjust the range of motion of the mixing and paving system in the horizontal plane. This allows the device to be adjusted in the X, Y, and Z directions, achieving the purpose of mixing, paving, and leveling the repair material within the localized subsidence area of ​​the asphalt pavement. This ensures the smoothness of the repaired asphalt pavement. Simultaneously, the corresponding repair method provided by this invention avoids the difficulties in compacting hot-mix asphalt mixtures in small areas and the difficulty in smoothly connecting them to existing pavements.

[0039] The present invention provides a repair material for local subsidence of asphalt pavement, which can also avoid the adverse effects of energy waste caused by heating hot-mix asphalt mixture, harm to the health of workers, and cooling of the mixture due to long-distance transportation, which seriously reduces the efficiency of compaction. Thus, it achieves the effect of saving time and labor. Attached Figure Description

[0040] To more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of the present invention and should not be considered as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort. In the drawings:

[0041] Figure 1 A schematic diagram of a repair device for localized subsidence of asphalt pavement provided by the present invention;

[0042] Figure 2 This is an internal structural view of the mixing and paving system provided by the present invention;

[0043] Figure 3 A view of the sliding mechanism between the mixing container and the guide beam provided by the present invention;

[0044] Figure 4 This is an internal structural view of the elevation control and leveling device provided by the present invention.

[0045] Figure 5 An internal structural view of the feeding structure provided by the present invention;

[0046] Figure 6 An internal structural view of the mixing container provided by the present invention;

[0047] Figure 7 This is a schematic diagram of the repair process of a repair device for local subsidence of asphalt pavement provided by the present invention.

[0048] The attached diagram shows the markings and corresponding component names:

[0049] 1-Elevation control and leveling device; 2-Elevation control switch; 3-Brake pulley; 4-Elevation leveling nut; 5-Spiral mixing rod; 6-Feeding device; 7-Engine; 8-Horizontal telescopic device; 9-Power unit; 10-Leveling device; 11-Mixing container; 12-Drive chain; 13-Guide beam; 14-Driving wheel; 15-Driven wheel; 16-Guide wheel; 17-Electric push rod; 18-Weighing sensor; 19-Telescopic connecting rod; 20-Sealing strip. Detailed Implementation

[0050] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of this invention are only for explaining this invention and are not intended to limit this invention.

[0051] Example 1

[0052] This embodiment 1 provides a repair device for localized subsidence of asphalt pavement. (See attached document.) Figure 1 As shown, the system includes a mixing and paving system and a guide rail system. The guide rail system includes a guide rail beam 13 and a horizontal telescopic device 8 arranged opposite each other. The guide rail beam 13 and the horizontal telescopic device 8 form a rectangular frame, and elevation control and leveling devices 1 are set at the four corners of the rectangular frame. The mixing and paving system includes a feeding device 6, a mixing device, and a leveling device 10 connected vertically from top to bottom. The two ends of the mixing device are connected to the guide rail beam 13 through a telescopic sliding mechanism. The mixing and paving system slides along the length or width of the rectangular frame under the drive of the telescopic sliding mechanism, so that the device can be adjusted in the X, Y and Z directions to adapt to different local settlement ranges of asphalt pavement.

[0053] Among them, see Figure 1 and Figure 5 As shown, the above-mentioned feeding device 6 is located directly above the mixing device. The engine 7 that drives the mixing device is also provided on the side of the feeding device 6. A pull-out isolation plate and a pair of weighing sensors 18 are provided at the outlet of the feeding device 6. The weighing sensors 18 are electrically connected to the pull-out isolation plate. The weighing sensors 18 can be selected as planar diaphragm type force sensors with a range of 1t and an operating temperature of -20℃ to 80℃. They are used for the accurate weighing of emulsified asphalt, minerals, cement and water. After the weighing of each material is completed, the pull-out isolation plate is opened to allow each material to flow down into the mixing device.

[0054] Among them, see Figure 1 and Figure 2 As shown, the mixing device includes a spiral mixing rod 5, a mixing container 11, and an engine 7. The mixing container 11 can extend and retract from both ends toward the middle along the width direction perpendicular to the rectangular frame. Correspondingly, the leveling device 10 fixed to the lower part of the mixing container 11 can extend and retract synchronously toward the middle with the mixing container 11. In this embodiment, a driven wheel 15 is provided in the middle of the spiral mixing rod 5, and a corresponding driving wheel 14 is provided at the output end of the engine 7. That is, the spiral mixing rod 5 and the engine 7 are connected by a transmission chain 12 for chain transmission, so that the spiral mixing rod 5 rotates in the mixing container 11 under the drive of the engine 7, uniformly mixing the repair material from the feeding device 6 and conveying it to both ends of the mixing container 11. After continuous mixing, it is spread on the subsided road surface area. Finally, the repair material is further leveled by the leveling device 10 fixed to the lower part of the mixing container 11.

[0055] Meanwhile, see Figure 1 and Figure 3As shown, both ends of the mixing device are connected to the guide beam 13 via a telescopic sliding mechanism, allowing the mixing and paving system to slide along the length or width of the rectangular frame under the drive of the telescopic sliding mechanism. Specifically, the telescopic sliding mechanism includes a power unit 9 and multiple guide wheels 16. The power unit 9 is fixedly connected to one of the horizontal telescopic devices 8. The output end of the power unit 9 is connected to the mixing container 11, and the output direction of the power unit 9 is parallel to the length direction of the rectangular frame. In addition, both ends of the mixing container 11 are respectively inserted through the oppositely arranged guide beam 13. The guide beam 13 is an I-beam, and multiple guide wheels 16 are arranged in the groove of the guide beam 13 between the wall of the mixing container 11 and the guide beam 13, thereby ensuring the completely parallel forward movement of the paving and mixing system.

[0056] Among them, see Figure 1 and Figure 4 As shown, the aforementioned elevation control and leveling device 1 includes an elevation control switch 2, a brake pulley 3, an elevation leveling nut 4, and an electric push rod 17. The electric push rod 17, located inside the elevation control and leveling device 1, has a propulsion rate of 10mm / s, a maximum thrust of 100kg, and a working voltage of DC24V. It is externally connected to the elevation control switch 2, allowing manual adjustment of its elevation to control and adjust the elevation of the entire device. The upper part of the elevation control and leveling device 1 is connected to the elevation leveling nut 4 to support the guide beam 13. The end of the guide beam 13 passes through the elevation leveling nut 4 to control the horizontal paving direction range. The adjustment stops when both ends of the leveling device contact the two ends of the local road subsidence, ensuring a smooth connection between the repaired surface and the existing road surface after leveling. The lower part of the elevation control and leveling device 1 is connected to the brake pulley 3, enabling the entire device to be moved to the road subsidence area.

[0057] Additionally, in this embodiment, see Figure 6 As shown, in order to allow sufficient time for the repair material to be mixed in the mixing container 11, the inner wall of the mixing container 11 is provided with a sealing strip 20 when it is in standby mode, in order to prevent the repair material from leaking into the subsidence area before it is evenly mixed after the machine is turned on.

[0058] Example 2

[0059] The repair material used in the repair device for localized subsidence of asphalt pavement provided in Example 1 is prepared from the following components in parts by weight:

[0060] 10-12 parts of styrene-butadiene copolymer modified emulsified asphalt;

[0061] 95-100 parts of ore;

[0062] 7-10 parts water;

[0063] 1-3 parts cement;

[0064] Among them, the styrene-butadiene copolymer modified emulsified asphalt is of type BCR, and its evaporation residue is not less than 62%;

[0065] The ore material is basalt or diabase;

[0066] The cement used is PO 42.5 ordinary Portland cement;

[0067] The water is purified water and meets or exceeds Class III water quality standards.

[0068] The preparation method of the repair material is as follows: first mix cement and mineral materials, then add water, and finally add styrene-butadiene copolymer modified emulsified asphalt, and mix it evenly at room temperature.

[0069] Example 3

[0070] The method for repairing asphalt pavement using the repair device and repair materials provided in Examples 1 and 2 includes the following steps:

[0071] S1. Clean the existing road surface subsidence area and its surroundings, and move the repair device to the local subsidence area of ​​the asphalt road surface;

[0072] S2. Adjust the horizontal paving direction of the horizontal expansion joint and guide beam according to the size and range of the settlement area, and make the paving direction perpendicular to the center line of the road.

[0073] S3. Select five cross-sections at the site of road subsidence. Use a 3-meter straightedge to find the starting point of subsidence at each cross-section. Use a distance of 30-50cm to the left and right of the furthest starting point of subsidence at each cross-section as the reference position for placing the leveling device. Figure 7 As shown;

[0074] S4. Adjust the elevation of the elevation control leveling device and the leveling device according to the cross slope of the road and the depth of the settlement, so that the two ends of the equipment leveling device are in close contact with the two ends of the largest left and right distance of the settlement, and the close contact range must extend 30-50cm beyond each end of the settlement.

[0075] S5. Calculate the required mass of repair materials based on the extent of local subsidence;

[0076] S6. Mix the repair material prepared in step S5 evenly;

[0077] S7. The mixing and paving system begins to advance, and both ends of the mixing and paving system move forward completely. After the subsided area is paved and smoothed, the device is shut off to make the subsided repair area smoothly connected to the existing road surface.

[0078] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A repair device for localized subsidence damage in asphalt pavements, characterized in that, This includes the mixing and paving system and the guide rail system; The guide rail system includes a guide rail beam (13) arranged opposite to each other and a horizontal telescopic device (8) arranged opposite to each other. The guide rail beam (13) and the horizontal telescopic device (8) arranged opposite to each other form a rectangular frame. An elevation control leveling device (1) is provided at each of the four corners of the rectangular frame. The mixing and paving system includes a feeding device, a mixing device, and a leveling device (10) connected vertically from top to bottom. The two ends of the mixing device are connected to the guide beam (13) through a telescopic sliding mechanism. The mixing and paving system slides along the length or width of the rectangular frame under the drive of the telescopic sliding mechanism. The mixing device includes a spiral mixing rod (5), a mixing container (11), and an engine (7). The mixing container (11) can extend and retract from both ends to the middle along the width direction perpendicular to the rectangular frame. The spiral mixing rod (5) rotates in the mixing container (11) under the drive of the engine (7) to uniformly convey the repair material to both ends of the mixing container (11). The outlet of the feeding device is provided with a pull-out isolation plate and a weighing sensor (18), and the weighing sensor (18) is electrically connected to the pull-out isolation plate. The telescopic sliding mechanism includes a power unit (9) and multiple guide wheels (16), and the mixing device includes a mixing container (11). The power device (9) is fixedly connected to the rectangular frame, and the output end of the power device (9) is connected to the mixing container (11). The output direction of the power device (9) is parallel to the length direction of the rectangular frame. The mixing container (11) can extend and retract from both ends to the middle along the width direction perpendicular to the rectangular frame. The two ends of the mixing container (11) are respectively inserted through the oppositely arranged guide beams (13), and a plurality of guide wheels (16) are arranged between the through walls of the mixing container (11) and the guide beams (13).

2. The repair device for localized subsidence of asphalt pavement according to claim 1, characterized in that, When the mixing container (11) is in standby mode, a sealing strip (20) is provided on its inner wall.

3. A method for repairing road surfaces, characterized in that, The repair device as described in claim 1 includes the following steps: S1. Clean the existing road surface subsidence area and its surroundings, and move the repair device to the local subsidence area of ​​the asphalt road surface; S2. Adjust the horizontal paving direction range of the horizontal expansion joint (8) and guide beam (13) according to the size range of the subsidence area, and make the paving direction perpendicular to the center line of the road. S3. Adjust the elevation of the elevation control leveling device (1) and the leveling device (10) according to the size of the road cross slope and the depth of settlement, so that the two ends of the equipment leveling device (10) are in close contact with the two ends of the maximum left and right interval of the settlement, and the close contact range must extend 30-50cm beyond the two ends of the settlement. S4. Calculate the required mass of repair materials based on the extent of local subsidence; S5. Mix the repair material prepared in step S5 evenly; S6. The mixing and paving system begins to advance, with both ends of the mixing and paving system moving forward in a direction completely perpendicular to the center line of the road. After the subsided area is paved and smoothed, the device is shut off, so that the subsided repair area is smoothly connected to the existing road surface.

4. The method for repairing road surfaces according to claim 3, characterized in that, Step S2 further includes the following steps: S21. Select five sections at the road surface subsidence location, use a three-meter straightedge to find the starting position of subsidence at each section, and use the distance from the starting position of subsidence at each section to the farthest point, extending 30-50cm to the left and right, as the reference position for placing the leveling device.

Images