Distributed vibration stirring foamed asphalt in-situ cold regeneration warm rolling construction method

Abstract

The invention discloses a distributed vibration stirring foamed asphalt in-situ cold-recycling warm-rolling construction method. Milling and stirring are separated, milling parameters of milling equipment are flexible to adjust, the particle size of a recycled material is controllable, the requirement can be met by adding less or even without adding new aggregates, the vibration stirring time is not less than 12 seconds, the stirring is uniform, and the construction efficiency is high. No residual fine material interlayer exists in a to-be-paved layer after material receiving and sweeping, permeable oil spreading is accurate and controllable, a pavement structure layer is reasonable, pavement performance is durable, equipment organization is flexible, multi-lane paving can be completed at a time, foamed asphalt can be prepared on site through a foamed asphalt vibration mixer truck, and the foamed asphalt can be prepared on the basis of the metering result of milled old asphalt and old materials. The adding amount of the foamed asphalt and the cement paste is automatically controlled according to the mixing ratio, so that the quality control of the reclaimed material is realized, on one hand, the test frequency is reduced, and on the other hand, the material mixing uniformity is greatly improved and the mixing efficiency is high by introducing vibration stirring.

Description

Technical Field

[0001] The invention relates to the technical field of pavement material recycling, and in particular to a distributed vibration stirring foamed asphalt in-situ cold regeneration warm rolling construction method. Background Art

[0002] Asphalt pavement in-situ cold recycling technology is a comprehensive and difficult technology that integrates materials, equipment and construction technology. It is widely used in road maintenance in European and American countries, forming a relatively complete system of materials, processes, equipment and construction methods. After decades of development, domestic highway construction is in the stage of moving from construction and maintenance to maintenance-oriented. Expanding the recycling of waste pavement materials, researching, mastering and promoting pavement recycling application technology and complete equipment development are a very urgent task in my country's highway construction. At present, the Wirtgen 380CR cold recycler has been introduced in China to carry out on-site cold recycling operations on the middle and lower asphalt pavements of low-grade roads. The milling of old asphalt and mixing of recycled mixtures are all completed in the milling device. The driving speed, milling rotor speed, material filling rate in the rotor cover and mixing time are mutually restricted. The grading of the milling material is not convenient to control, and the mixing effect of the recycled material is not good, resulting in insufficient density of the recycled surface layer and low durability of the road surface. Summary of the invention

[0003] The main purpose of the present invention is to provide a distributed vibration stirring foam asphalt in-situ cold regeneration warm rolling construction method to solve the problems of uncontrollable grading, poor stirring and mixing effect, insufficient density of the regenerated surface layer, and low durability of the pavement in the existing pavement regeneration process.

[0004] To achieve the above object, the present invention provides a distributed vibration stirring foam asphalt in-situ cold regeneration warm rolling construction method, including a water truck, a milling device, a stone spreading vehicle, a cement slurry vehicle, an intelligent temperature-controlled asphalt tanker, a stockpile conveying and sweeping vehicle, a vibration stirring vehicle, a paver, a roller and a heater, and includes the following construction steps: S1, milling of the recycled layer of old asphalt pavement; S11‌, the water truck and the milling equipment are hard-connected and run at a constant speed, the water truck delivers milling water to the milling equipment, the milling equipment mills the original road surface, screens the old asphalt and old materials after milling, adjusts the travel speed of the milling equipment and the speed of the milling rotor, determines the optimal travel speed and speed of the milling rotor, and then completes the milling of the entire original road surface; S2. Adjustment of particle size and gradation of recycled aggregate; S21. Screen the milling material for particle size gradation. According to the laboratory designed mix ratio, use a stone spreader to spread new aggregates of appropriate particle size on the milling material in a continuous and uniform manner. Then, collect the recycled aggregates continuously and uniformly in the center along the direction of paving the road and clean the area without recycled aggregate accumulation. Spread the fine aggregates evenly and continuously on the pile of recycled aggregates. Finally, shape and unify the accumulated material flow of recycled aggregates. S3, vibrating and stirring the foamed asphalt in-situ recycled mixture; S31, the cement slurry truck, the intelligent temperature-controlled asphalt tank truck and the foamed asphalt vibrating mixer truck are connected by pipes, the cement slurry truck supplies cement slurry, mixing water and asphalt foaming water to the foamed asphalt vibrating mixer truck, and the intelligent temperature-controlled asphalt tank truck supplies hot matrix asphalt or hot modified asphalt to the foamed asphalt vibrating mixer truck; S32. Test the performance of foamed asphalt, including half-life and expansion rate. Construction can only be continued when the performance of foamed asphalt meets the requirements; S33, the stockpile conveying and cleaning vehicle, the foamed asphalt vibrating mixer truck and the paver are hard-connected in sequence, and the paver pushes the vehicle at a constant speed to move in the center of the road surface to be paved, and the stockpile conveying and cleaning vehicle continuously, evenly and stably conveys the recycled aggregate to the foamed asphalt vibrating mixer truck, and at the same time cleans the road surface to be paved and recycles the cleaned fine materials; S34‌, the aggregate conveying metering unit on the foamed asphalt vibrating mixer measures the recycled aggregate and conveys the recycled aggregate into the vibrating mixer. The control system uses the quality of the recycled aggregate as a benchmark to control the cement paste metering spraying unit and the mixing water metering spraying unit to meter the cement paste and mixing water according to the mix ratio set by the system and convey them to the vibrating mixer. The foamed asphalt preparation metering spraying unit mixes the hot matrix asphalt or modified asphalt with asphalt foaming water in the foam generator according to the set ratio to produce foamed asphalt, and then sprays it onto the material in the vibrating mixer. The vibrated and uniformly stirred recycled mixture is conveyed to the silo of the paver through the rotating discharging belt conveyor. At the same time, the penetration oil spraying system on the foamed asphalt vibrating mixer automatically adjusts the spreading of penetration oil on the road surface to be paved according to the vehicle driving speed, spreading width and spreading amount per square meter. S4‌, the paver spreads the recycled mixture on the road surface continuously at a uniform speed according to the designed virtual paving coefficient, paving width and thickness; S5. Rollers are used to compact the reclaimed road surface. Rollers include rubber-wheel rollers, single-wheel vibratory rollers, double-wheel rollers, and oscillating rollers. S6, when the upper surface of the newly paved regenerated road surface loses water and turns white, a heating machine is used to heat the regenerated road surface that has been preliminarily compacted; S7‌, the rubber-wheel roller follows the heating machine to perform secondary kneading and compaction on the heated regenerated road surface; S8. Maintain the compacted road surface; S9. Seal coating, including spreading tack coat, paving asphalt sand or micro surfacing, and opening to light traffic.

[0005] In some embodiments, the milling equipment is a modified milling machine or a modified refrigeration regeneration machine, and operates in a forward milling mode.

[0006] In some embodiments, it also includes a particle size detection device arranged on the outside of the milling rotor cover, and a crushing device matching and cooperating with the milling rotor and a sensor for detecting the filling rate of the milling material in the cover are arranged inside the cover. The travel speed and rotor speed of the milling equipment are automatically controlled according to the detection result of the particle size detection device, and the particle size grading of the milling material is controlled.

[0007] In some embodiments, the heating machine heats the regenerated road surface at a temperature of 110-130°C.

[0008] In some embodiments, the intelligent temperature-controlled asphalt tanker is equipped with an asphalt storage tank, an asphalt filling circulation system, a generator set, a vertical shaft agitator, an admixture conveying and metering system, a control system, an overflow interface and a self-driving chassis.

[0009] In some embodiments, the asphalt pump outlet pipe of the asphalt filling circulation system is divided into two paths, one of which extends into the low-temperature zone of the asphalt storage tank, and the other serves as the asphalt discharge pipe in the asphalt storage tank. The asphalt pump inlet pipe is divided into two paths, one of which is connected to the vertical shaft agitator, and the other is connected to the three-way valve. The vertical shaft agitator is connected to the additive delivery and metering system. The three-way valve is divided into two paths, one of which extends through the valve into the upper part (high liquid level zone) of the open flame burning cylindrical furnace cavity in the asphalt storage tank, and the other of which extends through the valve into the bottom part (low liquid level zone) of the open flame burning cylindrical furnace cavity in the asphalt storage tank, for controlling the injection, discharge and circulation of asphalt in high and low temperature zones.

[0010] In some embodiments, an oil inlet is respectively arranged at the upper and lower parts of the open flame combustion cylindrical furnace and a temperature sensor is arranged at each oil inlet position, two oil inlet pipes are connected to a three-way valve at the outlet of the asphalt storage tank, and the other end of the three-way valve is connected to the overflow interface, and the opening and closing of the three-way valve can control the discharge of high and low liquid levels of asphalt, and the overflow interface is connected to the foamed asphalt preparation metering spraying unit on the foamed asphalt vibrating mixer truck through a pipeline.

[0011] In some embodiments, the control system controls the start and stop of the heater and the heating time of the heater according to the temperature sensor of the oil inlet, ensuring that the temperature of the matrix asphalt discharged from the overflow interface is quickly heated to and maintained at 160°C~170°C, and the temperature of the modified matrix asphalt is 180°C~200°C, without making the asphalt in the entire asphalt storage tank reach the required temperature for asphalt foaming.

[0012] In some embodiments, the pile material conveying and sweeping vehicle includes a material conveying unit, a residual material recovery unit, a power unit and a control unit, the power unit is electrically connected to the material conveying unit, the residual material recovery unit and the control unit respectively, and the control unit is electrically connected to the material conveying unit and the residual material recovery unit respectively.

[0013] In some embodiments, the material conveying unit includes a material receiving screw conveyor and a main chain plate conveyor, the material receiving screw conveyor and the main chain plate conveyor are both arranged on the frame of the pile material conveying and sweeping vehicle, and the output end of the material receiving screw conveyor is connected to the input end of the main chain plate conveyor; The residual material recovery unit includes a cleaning roller, a discharging screw conveyor and an auxiliary chain plate conveyor. One end of the auxiliary chain plate conveyor is fixed to one end of the discharging screw conveyor, and the other end is fixed to the side of the receiving screw conveyor. A protective cover is arranged outside the cleaning roller.

[0014] In some embodiments, the foamed asphalt vibrating mixer truck includes a self-propelled chassis, on which are provided a loading and metering belt conveyor, a vibrating mixer, a discharging belt conveyor, a heat transfer oil circulation heating system, a foam generator, a cement slurry metering and conveying system, a mixing water metering spraying unit, a permeable oil spraying system, a power system and a control system. The output ends of the loading and metering belt conveyor, the foam generator and the cement slurry metering and conveying system are all connected to the feeding port of the vibrating mixer, and the discharging port of the vibrating mixer is connected to the input end of the discharging belt conveyor; the heat transfer oil circulation heating system is used to heat the foam generator, and the permeable oil spraying system is arranged at the lower part of the discharging belt conveyor. The power system and the control system are electrically connected to the loading and metering belt conveyor, the vibrating mixer, the discharging belt conveyor, the heat transfer oil circulation heating system, the foam generator, the cement slurry metering and conveying system, and the permeable oil spraying system, respectively.

[0015] In some embodiments, a grader is also included, and the grader collects the milled old asphalt materials and piles them up at the middle position of the milled road surface.

[0016] In some embodiments, the compaction operation of the regenerated pavement is as follows: the regenerated pavement layer is 4cm to 7cm, and is initially compacted once by a rubber-wheel roller, and is re-compacted twice by a double-steel-wheel oscillating roller, and is finally compacted 2 to 4 times by a rubber-wheel roller; the regenerated pavement layer is 8cm to 14cm, and is initially compacted once by a rubber-wheel roller or a double-steel-wheel roller, and is re-compacted twice by a single-steel-wheel roller, and is compacted 3 to 6 times by a rubber-wheel roller, and is finally compacted twice by a double-steel-wheel roller or a rubber-wheel roller.

[0017] The beneficial effects of the present invention are: The present invention adopts a distributed vibration stirring foam asphalt on-site cold regeneration warm rolling process. Milling and stirring are separated, the milling parameters of the milling equipment are flexibly adjusted, the particle size of the recycled material is controllable, and the requirements can be met by adding less or even no new aggregate. The vibration stirring time is not less than 12 seconds, the mixing is uniform, and there is no residual fine material interlayer in the material collection and cleaning layer to be paved, and the spreading of the penetrating oil is accurate and controllable. The pavement structure layer is reasonable, the road performance is durable, the equipment organization is flexible, and multiple lanes can be paved at one time. The foamed asphalt vibration mixer truck can prepare foamed asphalt on site, and based on the metering results of the old asphalt and old materials after milling, the addition amount of foamed asphalt and cement slurry is automatically controlled according to the mix ratio to achieve quality control of the recycled material. On the one hand, the number of tests is reduced, and on the other hand, the introduction of vibration stirring greatly improves the material mixing uniformity and the mixing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a flow chart of the present invention.

[0019] Figure 2 It is a schematic diagram of the equipment construction process of the present invention.

[0020] In the figure, 1. Water truck; 2. Milling equipment; 3. Stone spreading truck; 4. Cement slurry truck; 5. Intelligent temperature-controlled asphalt tank truck; 6. Pile conveying and cleaning truck; 7. Foam asphalt vibrating mixer truck; 8. Paver; 9. Road roller; 10. Heating machine. DETAILED DESCRIPTION

[0021] The following is an explanation and description of the technical solutions of the embodiments of this specification in conjunction with the drawings of the embodiments of this specification, but the following embodiments are only preferred embodiments of this specification, not all. Based on the embodiments in the implementation mode, other embodiments obtained by those skilled in the art without creative work are all within the scope of protection of this specification.

[0022] The terms "first", "second", "third", etc. in the description and claims of this specification and the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices.

[0023] In the following description, terms such as "inside", "outside", "up", "down", "left", "right", etc. that indicate directions or positional relationships are only used to facilitate the description of the embodiments and simplify the description, and do not indicate or imply that the referred device or element must have a specific direction, be constructed and operate in a specific direction, and therefore should not be understood as a limitation of this specification.

[0024] Reference Figure 1-2 In general, the present invention provides a distributed vibration stirring foam asphalt in-situ cold regeneration warm rolling construction method, including a water truck 1, a milling device 2, a stone spreading vehicle 3, a cement slurry vehicle 4, an intelligent temperature-controlled asphalt tanker 5, a stockpile conveying and sweeping vehicle 6, a foam asphalt vibration mixer 7, a paver 8, a road roller 9 and a heater 10, wherein the milling device 2 is mainly used for cutting and crushing the old asphalt pavement, the heater 10 is used for heating the regenerated pavement, the water truck 1 provides water for milling operation to the milling device 2, and the intelligent temperature-controlled asphalt tanker 5 includes an asphalt storage tank, an asphalt filling circulation system, a generator set, a vertical shaft mixer, an admixture conveying and metering system, a control system, an overflow interface and a self-driving chassis, It is used to provide base asphalt to the foamed asphalt vibrating mixer 7. Before construction, the intelligent temperature-controlled asphalt tanker 5 preheats the base asphalt and maintains it at 160°C ~ 170°C, and the temperature of the modified base asphalt is 180°C ~ 200°C. The cement slurry truck 4 provides the foamed asphalt vibrating mixer 7 with water for asphalt foaming and mixing water and cement slurry for the production of recycled mixture. The stockpile conveying and sweeping truck 6 is used to clean and collect the old asphalt and old materials after milling, and convey them to the foamed asphalt vibrating mixer 7. The foamed asphalt vibrating mixer 7 is used for foaming asphalt and preparing recycled mixture. The paver 8 is used for paving the recycled mixture. The roller 9 is used for compacting the recycled road surface after paving.

[0025] The following steps are involved: S1, milling of the recycled layer of old asphalt pavement; S11, the waterwheel 1 and the milling device 2 are hard-connected and run at a constant speed, the waterwheel 1 delivers milling water to the milling device 2, the milling device 2 performs milling operation on the original road surface to be resurrected, screens the old asphalt and old materials after milling, adjusts the travel speed of the milling device 2 and the speed of the milling rotor, determines the optimal travel speed and speed of the milling rotor, and then completes the milling of the entire original road surface; In the embodiment, the cutting depth of the milling equipment 2 can be adjusted according to the road surface damage and the thickness requirement of the regenerated layer to ensure that the road surface base will not be damaged during the milling process, to ensure cutting efficiency and crushing quality, and to achieve effective recycling and utilization of old asphalt and old materials by milling the old asphalt layer, thereby reducing resource waste. At the same time, the old asphalt material is crushed into a suitable particle size distribution to provide high-quality raw materials for subsequent mixing. In this embodiment, the currently common mode of one-side milling operation and one-side normal traffic is adopted, wherein the milling equipment 2 is a modified milling machine, and the milling operation is performed in a forward milling manner. The milling material is discharged in the middle of the milling rotor, and the milling operation is performed in a forward milling manner. The cutter head spacing of the milling rotor is 15 cm, the pitch is 400 cm, the rotor diameter is 1.4 meters, and the rotation speed is 110 meters per minute. In this embodiment, the working speed of the forward milling rotor is increased, and the cutter head spacing is optimized, and the spiral line is arranged. It can ensure that the gradation of old asphalt materials directly meets the requirements of road cold regeneration specifications, and new aggregates can be added in small amounts or even without adding, which greatly improves work efficiency. At the same time, in this embodiment, the milling operation and the road regeneration operation are carried out separately. Traditional road cold regeneration mostly uses Wirtgen milling machines for operation. The milling rotor of the milling machine in this type of construction adopts counterclockwise milling, and stirs and mixes while milling. During operation, the newly added aggregate will be cut by the milling rotor, resulting in a lower aggregate particle size affecting the gradation. In this process, a modified milling machine can be used for forward milling operation to control the gradation of the material particle size by controlling the driving speed of the modified milling machine. That is, by adjusting the ground clearance and rotation speed of the milling rotor and the travel speed of the modified milling machine, the crushing time of the material can be controlled, thereby achieving the effect of controlling the particle size of the material, which not only improves the quality of the regenerated road surface but also does not need to add new aggregate to adjust the particle size ratio.

[0026] In some embodiments, it also includes a particle size detection device arranged outside the milling rotor housing, a crushing device matched with the milling rotor and a sensor for detecting the filling rate of the milling material in the housing are arranged in the housing, and the travel speed and rotor speed of the milling device 2 are automatically controlled according to the detection result of the particle size detection device, and the particle size gradation of the milling material is controlled. Preferably, an image scanning device is selected to capture and compare the image of the old asphalt material and the old material (for those skilled in the art, there are many means to achieve image capture of materials in the prior art, and the image scanning device is not specifically limited in this embodiment). By controlling the particle size determination detection result of the host, the travel speed of the milling device 2 is adjusted to achieve the effect of adjusting the particle size gradation, wherein the travel speed of the milling device 2 is controlled at 3.5-4 meters per minute; It should be understood that in order to control the gradation of materials, milling and regeneration have been carried out in steps in this embodiment, so as to meet the requirements of completing the milling of all the road surfaces to be regenerated before unified regeneration. The current road surface regeneration is carried out by milling and regenerating a single lane at the same time. This process allows multiple lanes to be milled first and then regenerated uniformly. In traditional road surface regeneration, after milling, it is necessary to wait for the paver to complete the paving operation before milling the other side of the road surface, which leads to a waste of construction time and reduces the construction efficiency of the regeneration operation. This process can adjust the width of the first milled road surface according to the actual road conditions. Compared with the existing road surface regeneration process, it has better applicability and better construction efficiency.

[0027] S2. Adjustment of particle size and gradation of recycled aggregate; S21. Screen the milling material for particle size gradation. According to the laboratory designed mix ratio (the designed mix ratio should meet the industry standard for recycled aggregate gradation requirements), for the missing particle size aggregate, use a stone spreader to spread the new aggregate of appropriate particle size on the milling material in proportion and continuously and evenly. Then, collect the recycled aggregate continuously and evenly in the center along the direction of the road to be paved, and clean the area without recycled aggregate accumulation. The fine aggregate obtained by cleaning is evenly and continuously spread on the pile of recycled aggregate. Finally, the pile of recycled aggregate is The material flow is shaped and unified. In the present application, if it is a single-lane regeneration, the modified milling equipment 2 can ensure that the milled material is piled in the middle of the road surface after milling. For multi-lane construction conditions, a grader can be used to collect the milled material to the middle of the road surface to be paved, and a skid sweeper can be used to clean the road dust at a prescribed distance. The collected powder is evenly arranged on the milling material pile, and the piled powder is evenly spread on the milling material pile, and the material pile is shaped along the length direction to make the material pile relatively uniform.

[0028] S3, vibrating and stirring the foamed asphalt in-situ recycled mixture; S31, the cement slurry truck and the intelligent temperature-controlled asphalt tank truck are connected to the foamed asphalt vibrating mixer truck 7 through pipelines, the cement slurry truck supplies cement slurry, mixing water and asphalt foaming water to the foamed asphalt vibrating mixer truck 7, and the intelligent temperature-controlled asphalt tank truck supplies hot matrix asphalt or hot modified asphalt to the foamed asphalt vibrating mixer truck 7; In the embodiment of the present application, the base asphalt or the heat-modified asphalt is foamed in a foam generator provided on the foamed asphalt vibrating mixer truck 7 .

[0029] In some embodiments, an intelligent temperature-controlled asphalt tank truck is provided with an asphalt storage tank, an asphalt filling circulation system, a generator set, a vertical shaft agitator, an admixture conveying and metering system, a control system, an overflow interface and a self-driving chassis, wherein the asphalt pump outlet pipe of the asphalt filling circulation system is divided into two paths, one extending into the low temperature zone of the asphalt storage tank, and the other serving as an asphalt discharge pipe in the asphalt storage tank; the asphalt pump inlet pipe is divided into two paths, one connected to the vertical shaft agitator, and the vertical shaft agitator is connected to the admixture conveying and metering system, and controls whether to add admixtures during the process of unloading the asphalt from the external asphalt tank into the vertical shaft agitator into the asphalt storage tank; the other is divided into two paths through a three-way valve, one extending into the upper part (high liquid level zone) of the open flame combustion cylindrical furnace cavity in the asphalt storage tank through the valve, and the other extending into the bottom (low liquid level zone) of the open flame combustion cylindrical furnace cavity in the asphalt storage tank through the valve, and the injection and discharge of asphalt and the circulation of asphalt in high and low temperature zones are realized by opening and closing different valves.

[0030] In some embodiments, an oil inlet is provided at the upper and lower parts of the open flame combustion cylindrical furnace, and a temperature sensor is provided at each oil inlet position. The two oil inlet pipes are connected to a three-way valve at the outlet of the asphalt storage tank, and the other end of the three-way valve is connected to an overflow interface. The opening and closing of the three-way valve can control the discharge of high and low liquid levels of asphalt. The overflow interface is connected to the foamed asphalt preparation metering spraying unit on the foamed asphalt vibrating mixer 7 through a pipeline.

[0031] In some embodiments, the control system controls the start and stop of the heater and the heating time of the heater according to the temperature sensor of the oil inlet, ensuring that the temperature of the base asphalt discharged from the overflow interface is quickly heated to and maintained at 160°C ~ 170°C, and the temperature of the modified base asphalt is 180°C ~ 200°C, without making the asphalt in the entire asphalt storage tank reach the required temperature for asphalt foaming.

[0032] S32. Test the performance of foamed asphalt, including half-life and expansion rate. Construction can only continue when the performance of foamed asphalt meets the requirements.

[0033] S33, the stockpile transport and cleaning vehicle, the foamed asphalt vibrating mixer truck 7 and the paver are hard-linked in sequence, and the paver pushes them at a constant speed in the center of the road surface to be paved. The stockpile transport and cleaning vehicle transports the recycled mixture to the foamed asphalt vibrating mixer truck 7 continuously, evenly and stably, and at the same time cleans the road surface to be paved and recycles the cleaned fine materials.

[0034] S34‌, the aggregate conveying and metering unit on the foamed asphalt vibrating mixer 7 meters the recycled aggregate and conveys the recycled aggregate into the vibrating mixer. The control system uses the quality of the recycled aggregate as a reference to control the cement paste metering and spraying unit and the mixing water metering and spraying unit to meter the cement paste and mixing water according to the mix ratio set by the system and convey them to the vibrating mixer. The foamed asphalt preparation metering and spraying unit mixes the hot matrix asphalt or modified asphalt with asphalt foaming water in a foam generator according to a set ratio to produce foamed asphalt, which is then sprayed onto the material in the vibrating mixer pot. The vibrated and uniformly stirred recycled mixture is conveyed to the silo of the paver through a rotating discharging belt conveyor. At the same time, the penetration oil spraying system on the foamed asphalt vibrating mixer 7 automatically adjusts the spreading of penetration oil to the road surface to be paved according to the vehicle's driving speed, spreading width and spreading amount per square meter.

[0035] In some embodiments, the stacking material conveying and sweeping vehicle includes a material conveying unit, a residual material recovery unit, a power unit and a control unit. The material conveying unit, the residual material recovery unit, the power unit and the control unit are all arranged on the body of the stacking material conveying and sweeping vehicle. The power unit is electrically connected to the material conveying unit, the residual material recovery unit and the control unit respectively. The control unit is electrically connected to the material conveying unit and the residual material recovery unit respectively. The material conveying unit includes a material receiving screw conveyor and a main chain plate conveyor. The material receiving screw conveyor and the main chain plate conveyor are both arranged on the frame of the stacking material conveying and sweeping vehicle, and the output end of the material receiving screw conveyor is connected to the output end of the main chain plate conveyor. The input end is connected, the residual material recovery unit includes a cleaning roller, a discharging screw conveyor and an auxiliary chain plate conveyor. One end of the auxiliary chain plate conveyor is fixed at one end of the discharging screw conveyor, and the other end is fixed at the side of the receiving screw conveyor. A protective cover is arranged on the outside of the cleaning roller. On the one hand, it plays a role of safety protection, and on the other hand, it can also prevent the residual fine aggregate from splashing everywhere during the cleaning process. The material conveying unit is used to convey the old milling asphalt material, and the residual material recovery unit is used to clean the road surface and recover the residual fine material. Through the stacking and conveying sweeper, the old asphalt material after milling can be effectively collected and the road surface can be cleaned, the residual fine aggregate on the ground can be eliminated, and the road surface is clean without interlayer.

[0036] It should be understood that, in this embodiment, the feeding metering belt conveyor of the foamed asphalt vibrating mixer 7 meters the old asphalt after milling and transports it to the vibrating mixer main machine, the intelligent temperature-controlled asphalt tanker transports the base asphalt to the foam generator of the foamed asphalt vibrating mixer 7 to produce foamed asphalt, the cement pulping truck provides foaming water to the foam generator and provides mixing water to the vibrating mixer main machine, specifically, the intelligent temperature-controlled asphalt tanker transports the base asphalt or modified asphalt in the high temperature zone to the foamed asphalt vibrating mixer 7 to produce foamed asphalt, and the control system is based on the old asphalt and the old materials. The amount of addition is adjusted according to the preset mix ratio of the foam generator, the cement slurry metering spraying unit and the mixing water metering spraying unit, and foamed asphalt, cement slurry and mixing water are sprayed into the vibration mixing host. The vibration mixing host fully mixes them to form a recycled mixture, and the recycled mixture is transported to the paver hopper through the discharging belt conveyor. At the same time, the penetrating oil spraying system at the bottom of the discharging belt conveyor sprays the penetrating oil on the road surface according to the vehicle speed and the spraying ratio set in the control system. The spraying amount is automatically adjusted to ensure uniform coverage of the pavement penetrating oil. Preferably, foamed asphalt is used as the penetrating oil.

[0037] In some embodiments, the foamed asphalt vibrating mixer truck 7 includes a self-propelled chassis, on which are provided a feeding metering belt conveyor, a vibrating mixer, a discharging belt conveyor, a heat transfer oil circulation heating system, a foam generator, a cement slurry metering spraying unit, a mixing water metering spraying unit, a permeable oil spraying system, a power system and a control system. The output ends of the feeding metering belt conveyor, the foam generator and the cement slurry metering spraying unit are all connected to the feeding port of the vibrating mixer, wherein a fully suspended belt scale is provided on the feeding metering belt conveyor. In actual construction, in order to In order to reduce the unevenness of the old asphalt and old materials falling on the feeding and metering belt conveyor, which causes the belt scale to be unable to measure, a flattening mechanism needs to be set at the feeding port of the pile conveying and sweeping vehicle to ensure that the old asphalt and old materials accumulated on the road can enter the pile conveying and sweeping vehicle relatively evenly after the action of the flattening mechanism, thereby realizing the measurement of the belt scale. The foam generator includes an asphalt foam generator and a pumping device. In this embodiment, the cement pulping truck provides foaming water to the asphalt foam generator and provides cement slurry and mixing water to the vibrating mixer, respectively, to realize the matrix asphalt. The preparation of foaming and recycled materials, the heat transfer oil circulation heating system is used to heat the foam generator, the permeable oil spraying system is arranged at the lower part of the discharging belt conveyor, the power system and the control system are respectively connected with the feeding metering belt conveyor, the vibrating mixer, the discharging belt conveyor, the heat transfer oil circulation heating system, the foam generator, the cement slurry metering spraying unit, the mixing water metering spraying unit and the permeable oil spraying system. By mixing the old asphalt and recycled materials, the effective regeneration and utilization of the old asphalt and recycled materials can be realized. At the same time, compared with the existing technology of the old asphalt and recycled materials In this embodiment, the quality of the recycled mixture can be guaranteed, the number of tests can be reduced, and work efficiency can be increased. In addition, the use of foamed asphalt can also reduce the temperature sensitivity of the mixture and improve the crack resistance of the pavement. A vibrating mixer is used to mix the materials. The dual effects of vibration and stirring can make the recycled mixture more evenly mixed, further improving the durability of the pavement. In addition, a penetrating oil spraying system is used to spray penetrating oil on the regenerated pavement to form a waterproof layer, making the pavement structure more stable. The penetrating oil is preferably sprayed with foamed asphalt.

[0038] S4, the paver spreads the recycled mixture on the road surface continuously at a uniform speed according to the designed virtual paving coefficient, paving width and thickness; It should be understood that in this embodiment, during the paving process, attention should be paid to controlling the paving speed and paving thickness to avoid uneven paving or insufficient thickness. At the same time, the coordination between the paver and the foamed asphalt vibrating mixer 7 should be ensured to maintain the continuous supply and paving of materials. The stacking and conveying sweeper is hard-connected to the front of the foamed asphalt vibrating mixer 7, and the rear of the foamed asphalt vibrating mixer 7 is hard-connected to the paver, so that the stacking and conveying sweeper can stably convey the old asphalt materials into the foamed asphalt vibrating mixer 7. At the same time, the foamed asphalt vibrating mixer 7 can recycle the old asphalt materials into recycled mixture and stably convey the recycled mixture to the paver. By collecting and conveying the old asphalt materials, the old asphalt materials can be completely and effectively recycled and utilized, reducing resource waste. At the same time, continuous material transportation can ensure the smooth progress of the operation process and improve operation efficiency.

[0039] S5. The roller performs preliminary compaction on the regenerated road surface; In this embodiment, the compaction operation of the regenerated pavement is specifically as follows: the regenerated pavement layer is 4cm to 7cm, and is initially compacted once by a rubber-wheel roller, re-compacted twice by a double-steel-wheel oscillating roller, and finally compacted 2 to 4 times by a rubber-wheel roller; the regenerated pavement layer is 8cm to 14cm, and is initially compacted once by a rubber-wheel roller or a double-steel-wheel roller, re-compacted twice by a single-steel-wheel roller, compacted 3 to 6 times by a rubber-wheel roller, and finally compacted twice by a double-steel-wheel roller or a rubber-wheel roller.

[0040] S6, when the upper surface of the newly paved regenerated road surface loses water and turns white, a heating machine is used to heat the regenerated road surface that has been preliminarily compacted; In this embodiment, when the surface of the newly paved regenerated road surface loses water and turns white or 12 hours after paving, the road surface is heated at a temperature of 110-130°C.

[0041] In some embodiments, the heating machine uses hot air heating, including two-stage heating bellows. The hot air heating method has high heat conduction efficiency, fast heating and low aging degree, avoiding local overheating or unheating problems. The two-stage heating bellows ensure uniform heating. By reheating the road surface after the initial compaction, the road surface after the initial compaction can be softened again, reducing road surface cracks.

[0042] S7‌, the rubber-wheel roller follows the heating machine to perform secondary kneading and compaction on the heated regenerated road surface; In this embodiment, a rubber-wheel roller is used for secondary compaction. After the heater heats the regenerated pavement for a period of time, the rubber-wheel roller quickly compacts the heated pavement for a second time, allowing the rubber-wheel roller to perform reciprocating repeated compaction. By heating and performing secondary compaction after the initial compaction, the density of the recycled mixture on the pavement can be greatly increased, the hollow rate of the regenerated pavement is less than 8%, and the generation of pavement cracks is reduced, thereby increasing the service life of the regenerated pavement.

[0043] S8. Maintain the compacted road surface.

[0044] S9. For covering, use 2cm asphalt sand or cm hot asphalt material or micro-surfacing for covering.

[0045] The present invention adopts a distributed regeneration method of continuous milling + vibration mixing + paving and rolling forming, which covers the whole process from milling to paving and compacting, and can complete the whole operation flow at one time with high operation efficiency. By precisely controlling each link in the operation flow, the particle size gradation is controllable, the gradation is accurate, the mixing is uniform, the efficiency is high, and the road quality is good. At the same time, the recycling of old asphalt materials is realized, the waste of resources is reduced, and the pollution to the environment is reduced. After the recycled mixture is stirred, it can be directly paved and compacted and then opened to light traffic, which greatly reduces the impact on traffic.

[0046] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A distributed vibration stirring foamed asphalt in-situ cold regeneration warm rolling construction method, characterized in that: The method comprises a water truck (1), a milling device (2), a stone spreading truck (3), a cement slurry truck (4), an intelligent temperature-controlled asphalt tank truck (5), a stockpile conveying and sweeping truck (6), a foamed asphalt vibrating mixer truck (7), a paver (8), a road roller (9) and a heating machine (10), and includes the following construction steps: S1, milling of the recycled layer of old asphalt pavement; S11, the waterwheel (1) and the milling device (2) are hard-connected and travel at a constant speed, the waterwheel (1) delivers milling water to the milling device (2), the milling device (2) mills the original road surface, screens the old asphalt and old materials after milling, adjusts the travel speed of the milling device and the speed of the milling rotor, determines the optimal travel speed and the speed of the milling rotor, and then completes the milling of the entire original road surface; S2. Adjustment of particle size and gradation of recycled aggregate; S21, screening the milling material for particle size distribution, and using a stone spreading vehicle (3) to spread new aggregate of appropriate particle size on the milling material in a continuous and uniform manner according to the laboratory designed mix ratio, and then continuously and uniformly collecting the recycled aggregate in the center along the direction of the paved road and cleaning the area without recycled aggregate accumulation, and evenly and continuously spreading the fine aggregate obtained from the cleaning on the pile of recycled aggregate, and finally shaping and unifying the accumulated material flow of the recycled aggregate; S3, vibrating and stirring the foamed asphalt in-situ recycled mixture; S31, the cement slurry truck (4), the intelligent temperature-controlled asphalt tank truck (5) and the foamed asphalt foamed asphalt vibrating mixer truck (7) are connected by pipes, the cement slurry truck (4) supplies cement slurry, mixing water and asphalt foaming water to the foamed asphalt foamed asphalt vibrating mixer truck (7), and the intelligent temperature-controlled asphalt tank truck (5) supplies hot base asphalt or hot modified asphalt to the foamed asphalt foamed asphalt vibrating mixer truck (7); S32. Test the performance of foamed asphalt, including half-life and expansion rate. Construction can only be continued when the performance of foamed asphalt meets the requirements; S33, the stockpile conveying and sweeping vehicle (6), the foamed asphalt vibrating mixer truck (7) and the paver (8) are hard-connected in sequence, and the paver (8) pushes the paver (8) at a constant speed and moves in the middle of the road surface to be paved, and the stockpile conveying and sweeping vehicle (6) conveys the recycled aggregate to the foamed asphalt vibrating mixer truck (7) continuously, evenly and stably, and at the same time cleans the road surface to be paved and recycles the cleaned fine materials; S34, the aggregate conveying metering unit on the foamed asphalt vibrating mixer (7) measures the recycled mixture and conveys the recycled aggregate into the vibrating mixer. The control system uses the mass of the recycled aggregate as a reference to control the cement slurry metering spraying unit and the mixing water metering spraying unit to meter the cement slurry and mixing water according to the mix ratio set by the system and convey them to the vibrating mixer. The foamed asphalt preparation metering spraying unit mixes the hot base asphalt or modified asphalt with asphalt foaming water according to the set ratio in the foam generator to produce foamed asphalt, which is then sprayed onto the material in the vibrating mixer. The vibrated and uniformly stirred recycled mixture is conveyed to the silo of the paver (8) through the rotating discharging belt conveyor. At the same time, the penetration oil spraying system on the foamed asphalt vibrating mixer (7) automatically adjusts the spreading of penetration oil onto the road surface to be paved according to the vehicle driving speed, spreading width and spreading amount per square meter. S4‌, the paver (8) continuously spreads the recycled mixture on the road surface at a uniform speed according to the designed virtual paving coefficient and paving width and thickness; S5, the roller (9) performs compaction operation on the regenerated road surface, and the roller (9) includes a rubber-wheel roller, a single-steel-wheel vibratory roller, a double-steel-wheel roller, and an oscillating roller; S6, when the upper surface of the newly paved regenerated road surface loses water and turns white, a heating machine (10) is used to heat the regenerated road surface that has been preliminarily compacted; S7, the rubber-wheel roller (9) follows the heating machine (10) to perform secondary kneading and compacting on the heated regenerated road surface; S8. Maintain the compacted road surface; S9. Seal coating, including spreading tack coat, paving asphalt sand or micro surfacing, and opening to light traffic.

2. According to claim 1, a distributed vibration stirring foamed asphalt in-situ cold regeneration warm rolling construction method is characterized by: The milling equipment (2) is a modified milling machine and a modified refrigeration regeneration machine, and operates in a forward milling mode.

3. According to claim 2, a distributed vibration stirring foamed asphalt in-situ cold regeneration warm rolling construction method is characterized by: It also includes a particle size detection device arranged outside the milling rotor housing, a crushing device matched with the milling rotor and a sensor for detecting the filling rate of the milling material in the housing are arranged inside the housing, and the travel speed and rotor speed of the milling equipment (2) are automatically controlled according to the detection result of the particle size detection device, so as to control the particle size distribution of the milling material.

4. According to claim 1, a distributed vibration stirring foamed asphalt in-situ cold regeneration warm rolling construction method is characterized by: The heating machine (10) heats the regenerated road surface at a temperature of 110 to 130°C.

5. According to claim 1, a distributed vibration stirring foamed asphalt in-situ cold regeneration warm rolling construction method is characterized by: The intelligent temperature-controlled asphalt tank truck (5) is provided with an asphalt storage tank, an asphalt filling circulation system, a generator set, a vertical shaft agitator, an admixture conveying and metering system, a control system, an overflow interface and a self-driving chassis.

6. According to claim 5, a distributed vibration stirring foamed asphalt in-situ cold regeneration warm rolling construction method is characterized by: The asphalt pump outlet pipe of the asphalt filling circulation system is divided into two paths, one of which extends into the low-temperature zone of the asphalt storage tank, and the other serves as the asphalt discharge pipe in the asphalt storage tank. The asphalt pump inlet pipe is divided into two paths, one of which is connected to the vertical shaft agitator, and the other is connected to the three-way valve. The vertical shaft agitator is connected to the admixture conveying and metering system. The three-way valve is divided into two paths, one of which extends through the valve into the upper part (high liquid level zone) of the open flame burning cylindrical furnace cavity in the asphalt storage tank, and the other of which extends through the valve into the bottom (low liquid level zone) of the open flame burning cylindrical furnace cavity in the asphalt storage tank, for controlling the injection and discharge of asphalt and the circulation of asphalt in high and low temperature zones.

7. According to claim 6, a distributed vibration stirring foamed asphalt in-situ cold regeneration warm rolling construction method is characterized by: The upper and lower parts of the open flame combustion cylindrical furnace are each provided with an oil inlet, and a temperature sensor is provided at each oil inlet position. Two oil inlet pipes are connected to a three-way valve at the outlet of the asphalt storage tank, and the other end of the three-way valve is connected to the overflow interface. The opening and closing of the three-way valve can realize the control of high and low liquid level asphalt discharge. The overflow interface is connected to the foamed asphalt preparation metering spraying unit on the foamed asphalt vibrating mixer truck (7) through a pipeline.

8. According to claim 7, a distributed vibration stirring foamed asphalt in-situ cold regeneration warm rolling construction method is characterized by: The control system controls the start and stop of the heater and the heating time of the heater according to the temperature sensor of the oil inlet, ensuring that the temperature of the base asphalt discharged from the overflow interface is quickly heated to and maintained at 160°C~170°C, and the temperature of the modified base asphalt is 180°C~200°C, without making the asphalt in the entire asphalt storage tank reach the required temperature for asphalt foaming.

9. According to claim 2, a distributed vibration stirring foamed asphalt in-situ cold regeneration warm rolling construction method is characterized by: The pile material conveying and sweeping vehicle (6) comprises a material conveying unit, a residual material recovery unit, a power unit and a control unit, wherein the power unit is electrically connected to the material conveying unit, the residual material recovery unit and the control unit respectively, and the control unit is electrically connected to the material conveying unit and the residual material recovery unit respectively.

10. A distributed vibration stirring foamed asphalt in-situ cold regeneration warm rolling construction method according to claim 6, characterized in that: The material conveying unit comprises a material receiving screw conveyor and a main chain plate conveyor, wherein the material receiving screw conveyor and the main chain plate conveyor are both arranged on the frame of the material stacking conveying and sweeping vehicle (6), and the output end of the material receiving screw conveyor is connected to the input end of the main chain plate conveyor; The residual material recovery unit includes a cleaning roller, a discharging screw conveyor and an auxiliary chain plate conveyor. One end of the auxiliary chain plate conveyor is fixed to one end of the discharging screw conveyor, and the other end is fixed to the side of the receiving screw conveyor. A protective cover is arranged outside the cleaning roller.

11. According to claim 2, a distributed vibration stirring foamed asphalt in-situ cold regeneration warm rolling construction method is characterized by: The foamed asphalt vibrating mixer truck (7) comprises a self-propelled chassis, on which are arranged a feeding metering belt conveyor, a vibrating mixer, a discharging belt conveyor, a heat transfer oil circulation heating system, a foam generator, a cement slurry metering and conveying system, a mixing water metering and spraying unit, a permeable oil spraying system, a power system and a control system. The output ends of the feeding metering belt conveyor, the foam generator and the cement slurry metering and conveying system are all connected to the feeding port of the vibrating mixer, and the discharging port of the vibrating mixer is connected to the input end of the discharging belt conveyor. The heat transfer oil circulation heating system is used to heat the foam generator. The permeable oil spraying system is arranged at the lower part of the discharging belt conveyor. The power system and the control system are respectively electrically connected to the feeding metering belt conveyor, the vibrating mixer, the discharging belt conveyor, the heat transfer oil circulation heating system, the foam generator, the cement slurry metering and conveying system, and the permeable oil spraying system.

12. According to claim 1, a distributed vibration stirring foamed asphalt in-situ cold regeneration warm rolling construction method is characterized by: The invention also comprises a grader, which collects the milled old asphalt and waste materials and piles them up at the middle position of the milled road surface.

13. The distributed vibration stirring foamed asphalt in-situ cold regeneration warm rolling construction method according to claim 1, characterized in that: The compaction operation of the regenerated road surface is as follows: when the regenerated road surface layer is 4 cm to 7 cm, a rubber-wheeled roller (9) is used for initial compaction once, a double-steel-wheeled oscillating roller (9) is used for recompacting twice, and the rubber-wheeled roller (9) is used for final compaction 2 to 4 times; when the regenerated road surface is 8 cm to 14 cm, a rubber-wheeled roller (9) or a double-steel-wheeled roller (9) is used for initial compaction once, a single-steel-wheeled roller (9) is used for recompacting twice, a rubber-wheeled roller (9) is used for 3 to 6 times, and a double-steel-wheeled roller (9) or a rubber-wheeled roller (9) is used for final compaction 2 times.

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