Construction method for bonding layer and sealing layer of pavement structure and foamed asphalt spraying device

Abstract

The invention provides a construction method of a bonding layer and a sealing layer of a pavement structure and a foamed asphalt distribution device. The pavement structure is sequentially provided with a water-stable base layer, a permeable layer, the sealing layer, a lower asphalt surface layer, the bonding layer, a middle asphalt surface layer, the bonding layer and an upper asphalt surface layer in the vertical direction. The sealing layer and the bonding layer are formed by uniformly spreading foamed asphalt, and the construction method comprises the following steps: according to construction requirements, obtaining the corresponding unit area spreading amounts of the sealing layer and the bonding layer; the real-time vehicle speed of the distribution truck is obtained in real time, the corresponding unit time distribution amount is obtained according to the real-time vehicle speed and the unit area distribution amount corresponding to the sealing layer / bonding layer, and the distribution truck runs and distributes foamed asphalt to the permeable layer, the asphalt lower surface layer and the asphalt middle surface layer according to the unit time distribution amount to form the corresponding sealing layer and bonding layer; according to the scheme, foamed asphalt can be produced in real time in the spraying process of the distribution truck, long-term storage can be avoided, asphalt waste cannot be caused, and the advantages of improving the construction progress, optimizing the construction process and the like are achieved.

Description

Technical Field

[0001] The present application relates to the technical field of asphalt spreaders, and in particular to a construction method for a tack coat and a sealing coat of a pavement structure and a foamed asphalt spreading device. Background Art

[0002] During asphalt pavement construction, the tack coat and seal coat of the asphalt pavement are currently mostly made of emulsified asphalt, modified emulsified asphalt and other materials. The production of emulsified asphalt requires special emulsified asphalt equipment. The raw materials for emulsified asphalt production are asphalt, emulsifier, modifier, etc., and the production cost is relatively high. Moreover, emulsified asphalt needs to be prepared in advance, but there is a time limit for its storage. In order to prevent demulsification, it cannot be stored for a long time. Summary of the invention

[0003] In view of the above-mentioned defects or deficiencies in the prior art, the present application aims to provide a construction method for a tack coat and a sealing coat of a pavement structure and a foamed asphalt spreading device.

[0004] In a first aspect, the present application proposes a construction method for a tack layer and a sealing layer of a pavement structure, wherein the pavement structure is sequentially provided with a water-stable base layer, a permeable layer, a sealing layer, an asphalt lower layer, a tack layer, an asphalt middle surface layer, a tack layer, and an asphalt upper surface layer in a vertical direction; wherein the sealing layer and the tack layer are formed by uniformly spreading foamed asphalt, and the construction method comprises the following steps:

[0005] According to the construction requirements, the unit area spraying amount corresponding to the sealing layer and the adhesive layer is obtained; the unit area spraying amount is the amount of the foamed asphalt sprayed by the spraying vehicle on the unit area of ​​the ground;

[0006] The real-time speed of the spraying vehicle is obtained in real time, and the first unit time spraying amount is obtained according to the unit area spraying amount corresponding to the sealing layer and the real-time speed. The first unit time spraying amount is the amount of the foamed asphalt sprayed per unit time by the spraying vehicle when the sealing layer is being constructed;

[0007] The spreading vehicle travels along a set driving path of the spreading vehicle and spreads the foamed asphalt on the permeable layer at the first unit time spreading amount to form the sealing layer;

[0008] According to the unit area spreading amount corresponding to the tack coat and the real-time vehicle speed, a second unit time spreading amount is obtained, wherein the second unit time spreading amount is the amount of the foamed asphalt spread per unit time when the spreading vehicle is performing the tack coat construction;

[0009] The spreader travels along a set travel path of the spreader and spreads the foamed asphalt onto the asphalt lower layer and the asphalt middle layer with the second unit time spreading amount to form the corresponding adhesive layer.

[0010] According to the technical solution provided in the embodiment of the present application, the first unit time spraying amount and the second unit time spraying amount are obtained by a preset model, and the preset model is obtained, which specifically includes the following steps:

[0011] Acquire a training data set, the training data set comprising a plurality of input samples and a unit area spraying amount corresponding to each of the input samples, the input samples comprising at least vehicle speed, asphalt parameters of the foamed asphalt, and road condition parameters of the ground, the asphalt parameters comprising at least asphalt viscosity and asphalt temperature, and the road condition parameters comprising at least road surface humidity and road surface roughness;

[0012] The input sample is used as input and the spraying amount per unit area is used as output to train the initial model to obtain the preset model.

[0013] According to the technical solution provided in the embodiment of the present application, the spreading vehicle travels and spreads the foamed asphalt on the permeable layer at the first unit time spreading amount to form the sealing layer, which at least includes the following steps:

[0014] If the rate of change of the real-time vehicle speed within the first preset time period is less than a first preset threshold, the foamed asphalt is sprayed onto the permeable layer at the first unit time spraying amount to form the sealing layer.

[0015] According to the technical solution provided in the embodiment of the present application, after obtaining the first unit time spraying amount according to the unit area spraying amount corresponding to the sealing layer and the real-time vehicle speed, the method further includes the following steps:

[0016] If the vehicle speed change rate of the real-time vehicle speed within the first preset time period is greater than or equal to the first preset threshold, calling the first vehicle speed change within the first preset time period;

[0017] According to the vehicle speed change, predict a second vehicle speed change within a second preset time period after the current moment, and obtain a spraying change corresponding to the second vehicle speed change;

[0018] The first unit time spreading amount is corrected by the spreading change to obtain a corrected first unit time spreading amount, and the foamed asphalt is spread on the permeable layer with the corrected first unit time spreading amount within the second preset time period to form the sealing layer.

[0019] In a second aspect, the present application proposes a foamed asphalt spreading device for realizing the construction method of the tack coat and the sealing coat of the pavement structure as described above, comprising:

[0020] A spreading vehicle, the spreading vehicle comprising a first carrying plate;

[0021] Asphalt foaming component, the asphalt foaming component is arranged on the first bearing plate, and the asphalt foaming component includes:

[0022] A storage element, wherein the storage element has a first containing cavity for containing asphalt;

[0023] A foaming element, wherein the foaming element has a foaming cavity; the asphalt in the first accommodating cavity can be transported into the foaming cavity;

[0024] An injection element, the injection element is used to inject a foaming agent into the foaming cavity, and the foaming cavity is used to mix the foaming agent with the asphalt and foam to form foamed asphalt;

[0025] A spreading assembly is used to spray the foamed asphalt onto the permeable layer, the asphalt lower layer, and the asphalt middle surface layer when the spreading vehicle is driving on the ground, so as to form the corresponding sealing layer and the adhesive layer.

[0026] According to the technical solution provided in the embodiment of the present application, the storage element and the foaming element are connected by a first delivery pipe, and a first switch and a first delivery pump are also installed on the first delivery pipe. The first switch is used to control the connection / isolation of the first accommodating cavity and the foaming cavity. When the first switch controls the connection between the first accommodating cavity and the foaming cavity, the first delivery pump is used to transport the asphalt in the first accommodating cavity to the foaming cavity.

[0027] According to the technical solution provided in the embodiment of the present application, the injection element has a second accommodating cavity for accommodating the foaming agent; the injection element and the foaming element are connected by a second delivery pipe, and a second switch and a second delivery pump are also installed on the second delivery pipe. The second switch is used to control the connection / isolation of the second accommodating cavity and the foaming cavity. When the second switch controls the second accommodating cavity and the foaming cavity to be connected, the second delivery pump is used to deliver the foaming agent in the second accommodating cavity to the foaming cavity.

[0028] According to the technical solution provided in the embodiment of the present application, the foaming element has a first outlet connected to the foaming cavity, the spreading assembly includes a spraying pipe connected to the first outlet, and the spraying pipe is connected to a spray head away from the first outlet end; the spraying pipe is also connected in series with a flow regulating switch for regulating the flow of the foamed asphalt flowing in the spraying pipe.

[0029] According to the technical solution provided in the embodiment of the present application, an installation interface is also reserved on the spray pipe, and the installation interface is used to install a pressure regulating element for regulating the pressure in the spray pipe.

[0030] According to the technical solution provided in the embodiment of the present application, a heating element is further provided outside the storage element, the foaming element and the spreading assembly, and the heating element is used to maintain the fluidity of the asphalt or the foamed asphalt.

[0031] Compared with the prior art, the beneficial effect of the present application is that the present application proposes a pavement structure, in which the sealing layer on the permeable layer, the tack layer on the asphalt lower layer, and the tack layer on the asphalt middle surface layer are all formed by spreading foamed asphalt. During the construction process, by configuring a special asphalt foaming element on the asphalt spreading vehicle, ordinary asphalt or modified asphalt and other materials are processed into foamed asphalt and directly sprayed on the road surface, the construction of the tack layer or sealing layer is completed, and the production cost is reduced. The solution can produce foamed asphalt in real time during the spraying process of the spreading vehicle, which can avoid long-term storage and will not cause asphalt waste, and has the advantages of improving construction progress and optimizing construction technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A flowchart of the steps of the construction method of the adhesive layer and the sealing layer of the pavement structure provided in the embodiment of the present application;

[0033] Figure 2 A schematic diagram of the structure of the construction road surface provided in the embodiment of the present application;

[0034] Figure 3 A schematic diagram of the structure of a foamed asphalt spreading device provided in an embodiment of the present application.

[0035] The text annotations in the figure represent:

[0036] 1. Second accommodating cavity; 2. Liquid level sensor; 3. Second switch; 4. Second delivery pump; 5. Pressure sensor; 6. Safety valve; 7. Flow sensor; 8. Solenoid valve; 9. One-way valve; 10. Injection opening; 11. First accommodating cavity; 12. First switch; 13. First delivery pump; 14. Asphalt three-way valve; 15. Foaming cavity; 16. Spraying pipe; 17. Spraying head; 18. Permeable layer; 19. Sealing layer; 20. Adhesive layer. DETAILED DESCRIPTION

[0037] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant invention, rather than to limit the invention. It is also necessary to explain that, for ease of description, only the parts related to the invention are shown in the accompanying drawings.

[0038] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0039] Example 1

[0040] As mentioned in the background technology, in view of the problems in the prior art, the present application proposes a construction method of a tack layer 20 and a sealing layer 19 of a pavement structure, wherein the pavement structure is sequentially provided with a water-stable base layer, a permeable layer 18, a sealing layer 19, an asphalt lower layer, a tack layer 20, an asphalt middle surface layer, a tack layer 20, and an asphalt upper surface layer in the vertical direction; wherein the sealing layer 19 and the tack layer 20 are formed by uniformly spreading foamed asphalt;

[0041] First, the water-stable base layer and the permeable layer 18 are laid. After the permeable layer 18 is laid according to the construction requirements, the surface of the permeable layer 18 is cleaned. After the cleaning is completed and the acceptance work is completed, the construction method is started. The construction method includes the following steps:

[0042] S1. According to the construction requirements, the unit area spraying amount corresponding to the sealing layer 19 and the adhesive layer 20 is obtained; the unit area spraying amount is the amount of the foamed asphalt sprayed by the spraying vehicle on the unit area of ​​the ground;

[0043] S2, obtaining the real-time speed of the spraying vehicle in real time, and obtaining the first spraying amount per unit time according to the spraying amount per unit area corresponding to the sealing layer 19 and the real-time speed, wherein the first spraying amount per unit time is the amount of the foamed asphalt sprayed per unit time by the spraying vehicle when the sealing layer 19 is being constructed;

[0044] Specifically, the real-time vehicle speed can be collected in real time by an encoder arranged on the tires of the spreader body, or a plurality of vehicle speed sensors can be arranged at different positions of the spreader body to avoid the situation where the sensor is damaged and the vehicle speed cannot be obtained in time.

[0045] S3, the spreading vehicle travels along a set driving path and spreads the foamed asphalt onto the permeable layer 18 at the first unit time spreading amount to form the sealing layer 19;

[0046] After forming the sealing layer 19, continue to lay the asphalt lower layer located on the side of the sealing layer 19 away from the permeable layer 18. When the asphalt lower layer is laid according to the use requirements and the surface is cleaned, continue to lay the adhesive layer 20, the asphalt middle surface layer, the adhesive layer 20, and the asphalt upper layer in sequence. It should be noted that there is an upper sealing layer on the top of the asphalt upper layer, and the upper sealing layer is usually not sprayed with foamed asphalt. The sealing layer 19 in this scheme only refers to the sealing layer located on the permeable layer 18. The upper sealing layer is not described in this scheme. The asphalt middle surface layer, the asphalt upper layer, and the upper sealing layer are all laid using traditional methods, which are not described here. When laying the adhesive layer 20, continue construction according to the following construction method;

[0047] S4, according to the unit area spraying amount corresponding to the tack layer 20 and the real-time vehicle speed, obtaining a second unit time spraying amount, wherein the second unit time spraying amount is the amount of the foamed asphalt sprayed per unit time by the spraying vehicle when the tack layer 20 is being constructed;

[0048] S5. The spreader travels along the set driving path of the spreader and spreads the foamed asphalt onto the asphalt lower layer and the asphalt middle layer at the second unit time spreading amount to form the corresponding adhesive layer 20.

[0049] Specifically, when foamed asphalt is used to form the seal layer 19, the asphalt is foamed through a foaming element to generate foamed asphalt and directly spread on the base layer sprayed with the penetrating layer 18 oil, and then a certain amount of crushed stone is spread to form the lower seal layer 19, so as to close the surface gaps and prevent water from seeping in. At the same time, it plays the role of bonding and protecting the top surface of the base layer to enhance the bonding between the base layer and the asphalt layer, thereby improving the durability and performance of the road surface. The speed of the asphalt spreading vehicle is generally controlled at 2-20km / h, and the amount of foamed asphalt per unit area is controlled between 0.5kg / m2 and 1.2kg / m2. After the construction of the lower seal layer 19, the asphalt surface mixture is spread.

[0050] The tack coat 20 asphalt spreading operation should be carried out between the asphalt lower layer and the middle surface layer, and between the middle surface layer and the upper layer. The speed of the asphalt spreading vehicle should be 5-25km / h, and the unit area spreading amount of foamed asphalt should be controlled between 0.2kg / m2 and 0.5kg / m2. The tack coat 20 can enhance the bonding force between the two layers and ensure the integrity and stability of the asphalt pavement.

[0051] Specifically, the pavement structure proposed in this embodiment can be widely used in highways of all grades, urban roads, rural roads, etc. The construction process of the pavement structure is to foam the asphalt through the asphalt foaming component on the main body of the spreader to generate foamed asphalt and directly spread it on the asphalt pavement structure layer, which has the advantages of simplified construction process, reduced material cost, reduced energy consumption, and accelerated construction progress. During the construction process, adjust the matching of personnel and mechanical equipment to ensure the normal operation of the construction machinery. Determine the spraying amount of asphalt for each functional layer according to the project design requirements and actual conditions, and clean the water-stable base or asphalt layer working surface to be spread, so as to facilitate the bonding effect between the foamed asphalt and the water-stable base, and the foamed asphalt and the asphalt layer after spreading.

[0052] Specifically, according to the construction requirements and the real-time vehicle speed, the spreading amount per unit area is set, and the set spreading amount per unit area and the real-time vehicle speed are output to the preset model. The output of the preset model is the target spreading amount per unit time, and the target spreading amount per unit time is the amount of the foamed asphalt spread on the ground per unit time.

[0053] In a preferred embodiment, the first unit time spraying amount and the second unit time spraying amount are obtained by a preset model, and the preset model is obtained, which specifically includes the following steps:

[0054] Acquire a training data set, the training data set comprising a plurality of input samples and a unit area spraying amount corresponding to each of the input samples, the input samples comprising at least vehicle speed, asphalt parameters of the foamed asphalt, and road condition parameters of the ground, the asphalt parameters comprising at least asphalt viscosity and asphalt temperature, and the road condition parameters comprising at least road surface humidity and road surface roughness;

[0055] The input sample is used as input and the spraying amount per unit area is used as output to train the initial model to obtain the preset model.

[0056] Specifically, a preset model is established through a large number of experiments and theoretical analysis. During the experiment, under different vehicle speed conditions (such as 5 m / s, 8 m / s, 12 m / s, etc.), the unit area spraying amount corresponding to different unit time spraying amounts (such as 20 liters / minute, 30 liters / minute, 40 liters / minute, etc.) is measured. For example, when the vehicle speed is 5 m / s and the unit time spraying amount is 20 liters / minute, after multiple experimental measurements, the unit area spraying amount is 0.4 liters / square meter; when the vehicle speed is 8 m / s and the unit time spraying amount is 30 liters / minute, the unit area spraying amount is 0.5 liters / square meter, etc. Based on these experimental data, a mathematical fitting method (such as polynomial fitting, linear regression, etc.) is used to establish a relationship model between the unit area spraying amount, the unit time spraying amount and the real-time vehicle speed, which is the preset model.

[0057] In a preferred embodiment, the spreading vehicle travels and spreads the foamed asphalt onto the permeable layer 18 at the first spreading amount per unit time to form the sealing layer 19, which at least includes the following steps:

[0058] If the vehicle speed change rate of the real-time vehicle speed within the first preset time period is less than the first preset threshold, the foamed asphalt is sprayed onto the permeable layer 18 at the first unit time spraying amount to form the sealing layer 19 .

[0059] Specifically, if the real-time speed of the spreader body is relatively stable, the flow regulating switch can be directly controlled to open to the target opening, so that the rear spray head 17 can spray foam asphalt onto the ground with a stable spreading amount per unit area while the spreader body is driving stably.

[0060] However, if the vehicle speed suddenly increases, there may be a lag in controlling the flow regulating switch based on the target opening corresponding to the real-time vehicle speed calculated above, which makes the spraying of foamed asphalt uneven.

[0061] In order to solve the above defects, further, after obtaining the first unit time spraying amount according to the unit area spraying amount corresponding to the sealing layer 19 and the real-time vehicle speed, the method further includes the following steps:

[0062] If the vehicle speed change rate of the real-time vehicle speed within the first preset time period is greater than or equal to the first preset threshold, calling the first vehicle speed change within the first preset time period;

[0063] According to the vehicle speed change, predict a second vehicle speed change within a second preset time period after the current moment, and obtain a spraying change corresponding to the second vehicle speed change;

[0064] The first unit time spreading amount is corrected by the spreading change to obtain a corrected first unit time spreading amount, and the foamed asphalt is spread on the permeable layer 18 with the corrected first unit time spreading amount within the second preset time to form the sealing layer 19.

[0065] Specifically, a prediction model of vehicle speed change is established through historical construction data and experimental analysis of the asphalt spreading device. A time series analysis method, such as an ARIMA model (autoregressive integrated moving average model) or a prediction model based on a neural network can be used. Exemplarily, the neural network is trained using vehicle speed change data within a plurality of first preset time periods in the past, the input of the neural network is the historical vehicle speed change and related time information, and the output is the predicted vehicle speed change.

[0066] According to the established vehicle speed prediction model and the first vehicle speed change, a second vehicle speed change within a second preset time after the current moment is predicted. For example, the second preset time is set to 5 seconds, and the first vehicle speed change is input into the prediction model, and it is predicted that the vehicle speed may increase by another 3 m / s within the next 5 seconds, which is the second vehicle speed change.

[0067] Specifically, the opening change corresponding to the second vehicle speed change is determined according to the relationship between the vehicle speed change and the flow regulating switch opening change. For example, it is found through experiments that the opening of the flow regulating switch needs to change by 5% for every 1 m / s change in vehicle speed. Then, when the second vehicle speed change is 3 m / s, the opening change is 15%.

[0068] Specifically, if it is detected that the vehicle speed suddenly increases, if the calculated target opening is 50%, within the second preset time, the control system controls the flow regulating switch to open to the corrected target opening. For example, in the next 5 seconds, the control system continues to send control instructions to keep the opening of the flow regulating switch at 65%. In this process, the control system can monitor the changes in vehicle speed in real time. If it is found that the actual vehicle speed deviates from the predicted vehicle speed, or the actual opening of the flow regulating switch deviates from the corrected target opening (such as a deviation of more than 2%), the control instruction can be fine-tuned to ensure that the flow regulating switch can accurately maintain the corrected target opening.

[0069] During the construction operation, it is usually necessary to first spray the penetration layer 18, then the adhesive layer 20, and finally the upper sealing layer 19. The foamed asphalt spreading device described in Example 1 is used to spread the sealing layer 19 and the adhesive layer 20. The spreading vehicle should maintain a stable speed and spraying amount, and ensure uniform spraying within the entire spraying width. The spraying order is generally from the inside to the outside, one lane after another, with no overlap or little overlap between two adjacent lanes, but no white exposure. After the spreading is completed, there is no need to close the traffic for maintenance, and the next process can be carried out directly. When carrying out the spreading construction operation of the asphalt sealing layer 19, the vehicle speed should be kept stable, the height of the spray head 17 should be appropriate, and the spreading amount should be uniform and without omissions, so as to ensure that the mineral material fully covers the asphalt surface and does not overlap. When carrying out the construction operation of the asphalt adhesive layer 20, the spreading should ensure uniformity and without omissions to avoid blanks or accumulation. The amount of each functional layer to be spread should be determined in real time according to the design requirements through the driving program, and during construction, care should be taken to avoid construction under adverse conditions such as strong winds, rainfall or temperatures below 10°C.

[0070] Example 2

[0071] Based on Example 1, this example proposes a foamed asphalt spreading device to implement the construction method of the tack layer 20 and the sealing layer 19 of the pavement structure as described above, including:

[0072] A spreading vehicle, the spreading vehicle comprising a first carrying plate;

[0073] Asphalt foaming component, the asphalt foaming component is arranged on the first bearing plate, and the asphalt foaming component includes:

[0074] A storage element, wherein the storage element has a first containing cavity 11 for containing asphalt;

[0075] A foaming element, wherein the foaming element has a foaming cavity 15; the asphalt in the first accommodating cavity 11 can be transported into the foaming cavity 15;

[0076] An injection element, the injection element is used to inject a foaming agent into the foaming cavity 15, and the foaming cavity 15 is used to mix the foaming agent with the asphalt and foam to form foamed asphalt;

[0077] A spreading assembly is used to spray the foamed asphalt onto the permeable layer 18, the asphalt lower layer, and the asphalt middle surface layer when the spreading vehicle is driving on the ground, so as to form the corresponding sealing layer 19 and the adhesive layer 20.

[0078] Furthermore, the injection element also includes a pressure sensor 5 for real-time monitoring of the pressure in the second delivery pipeline. The pressure sensor 5 is electrically connected to a safety valve 6. When the pressure in the second delivery pipeline is too high, the safety valve 6 is closed in time. A flow sensor 7 is also installed in the second delivery pipeline to monitor whether the flow rate of the foaming agent flowing through the second delivery pipeline is consistent with the calculated second flow rate. The solenoid valve 8 controls the opening degree of the second switch 3 by receiving the electrical signal of the control system, thereby adjusting the flow rate of the foaming agent. The one-way valve 9 is used to prevent the foaming agent from flowing back into the second accommodating cavity 1.

[0079] In a preferred embodiment, the storage element and the foaming element are connected by a first delivery pipe, and a first switch 12 and a first delivery pump 13 are also installed on the first delivery pipe. The first switch 12 is used to control the connection / isolation of the first accommodating cavity 11 and the foaming cavity 15. When the first switch 12 controls the connection between the first accommodating cavity 11 and the foaming cavity 15, the first delivery pump 13 is used to transport the asphalt in the first accommodating cavity 11 to the foaming cavity 15.

[0080] In a preferred embodiment, the injection element has a second accommodating cavity 1 for accommodating the foaming agent; the injection element and the foaming element are connected by a second delivery pipe, and the second delivery pipe is also equipped with a second switch 3 and a second delivery pump 4. The second switch 3 is used to control the connection / isolation of the second accommodating cavity 1 and the foaming cavity 15. When the second switch 3 controls the connection between the second accommodating cavity 1 and the foaming cavity 15, the second delivery pump 4 is used to transport the foaming agent in the second accommodating cavity 1 to the foaming cavity 15.

[0081] In a preferred embodiment, the foaming element has a first outlet connected to the foaming cavity 15, and the spreading assembly includes a spraying pipe 16 connected to the first outlet, and the spraying pipe 16 is connected to a spray head 17 away from the first outlet end; the spraying pipe 16 is also connected in series with a flow regulating switch for regulating the flow of the foamed asphalt flowing in the spraying pipe 16.

[0082] In a preferred embodiment, a mounting interface is reserved on the spraying pipe 16 , and the mounting interface is used to install a pressure regulating element for regulating the pressure in the spraying pipe 16 .

[0083] In a preferred embodiment, the storage element, the foaming element and the spreading assembly are further provided with a heating element, and the heating element is used to maintain the fluidity of the asphalt or the foamed asphalt.

[0084] Specifically, during the construction process, high-temperature asphalt is first added into the first containing cavity 11 through the feed port of the storage element. When the spreader body starts to travel on the ground, the control system controls the flow control valve at the bottom of the storage element according to the preset construction parameters, so that the asphalt enters the foaming cavity 15 of the foaming element through the first delivery pipe at a certain flow rate (such as 50 liters / minute).

[0085] At the same time, the second delivery pump 4 of the injection element draws the foaming agent from the second accommodating cavity 1, and after the flow rate is adjusted by the flow regulating device, it is injected into the foaming cavity 15 through the injection opening 10 above the foaming cavity 15. In the foaming cavity 15, the asphalt and the foaming agent are fully mixed and foamed under the action of the stirring shaft and the stirring blades to form uniform foamed asphalt.

[0086] The foamed asphalt is transported to each nozzle through the spraying pipe 16 of the spreading assembly, and the nozzle sprays the foamed asphalt evenly on the ground. During the spraying process, the control system can adjust the spraying angle and flow rate of the nozzle in real time according to the speed of the spreading vehicle and construction requirements to ensure that the amount of foamed asphalt sprayed on each square meter of road surface remains stable.

[0087] This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and its core ideas of this application. The above is only the preferred implementation method of this application. It should be pointed out that due to the limitations of textual expression and the objective existence of infinite specific structures, ordinary technicians in this technical field can make several improvements, modifications or changes without departing from the principles of the present invention, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the inventive concept and technical solution to other occasions without improvement, should be regarded as the scope of protection of this application.

Claims

1. A method for constructing a tack coat and a seal coat of a pavement structure, characterized in that: The pavement structure is provided with a water-stable base layer, a permeable layer (18), a sealing layer (19), an asphalt lower layer, a tack layer (20), an asphalt middle surface layer, a tack layer (20), and an asphalt upper surface layer in sequence in the vertical direction; wherein the sealing layer (19) and the tack layer (20) are formed by uniformly spreading foamed asphalt, and the construction method comprises the following steps: According to the construction requirements, the unit area spraying amount corresponding to the sealing layer (19) and the adhesive layer (20) is obtained; the unit area spraying amount is the amount of the foamed asphalt sprayed by the spraying vehicle on the unit area of ​​the ground; The real-time speed of the spraying vehicle is obtained in real time, and a first spraying amount per unit time is obtained according to the spraying amount per unit area corresponding to the sealing layer (19) and the real-time speed, wherein the first spraying amount per unit time is the amount of the foamed asphalt sprayed per unit time by the spraying vehicle when the sealing layer (19) is being constructed; The spreading vehicle travels along a set travel path and spreads the foamed asphalt onto the permeable layer (18) at the first spreading amount per unit time to form the sealing layer (19); According to the unit area spraying amount corresponding to the adhesive layer (20) and the real-time vehicle speed, a second unit time spraying amount is obtained, wherein the second unit time spraying amount is the amount of the foamed asphalt sprayed per unit time when the spraying vehicle is carrying out the construction of the adhesive layer (20); The spreader travels along a set travel path of the spreader and spreads the foamed asphalt onto the asphalt lower layer and the asphalt middle layer at the second unit time spreading amount to form the corresponding adhesive layer (20).

2. The construction method of the tack coat and seal coat of the pavement structure according to claim 1, characterized in that: The first unit time spraying amount and the second unit time spraying amount are obtained by using a preset model, and the preset model is obtained, which specifically includes the following steps: Acquire a training data set, the training data set comprising a plurality of input samples and a unit area spraying amount corresponding to each of the input samples, the input samples comprising at least vehicle speed, asphalt parameters of the foamed asphalt, and road condition parameters of the ground, the asphalt parameters comprising at least asphalt viscosity and asphalt temperature, and the road condition parameters comprising at least road surface humidity and road surface roughness; The input sample is used as input and the spraying amount per unit area is used as output to train the initial model to obtain the preset model.

3. The construction method of the tack coat and seal coat of the pavement structure according to claim 1, characterized in that: The spreading vehicle travels and spreads the foamed asphalt onto the permeable layer (18) at the first spreading amount per unit time to form the sealing layer (19), which at least comprises the following steps: If the rate of change of the real-time vehicle speed within a first preset time period is less than a first preset threshold, the foamed asphalt is sprayed onto the permeable layer (18) at the first unit time spraying amount to form the sealing layer (19).

4. The method for constructing a tack coat and a seal coat of a pavement structure according to claim 3, characterized in that: After obtaining the first unit time spraying amount according to the unit area spraying amount corresponding to the sealing layer (19) and the real-time vehicle speed, the method further comprises the following steps: If the vehicle speed change rate of the real-time vehicle speed within the first preset time period is greater than or equal to the first preset threshold, calling the first vehicle speed change within the first preset time period; According to the vehicle speed change, predict a second vehicle speed change within a second preset time period after the current moment, and obtain a spraying change corresponding to the second vehicle speed change; The first unit time spreading amount is corrected by the spreading variation to obtain a corrected first unit time spreading amount, and the foamed asphalt is spread on the permeable layer (18) with the corrected first unit time spreading amount within the second preset time period to form the sealing layer (19).

5. A foamed asphalt spreading device for realizing the construction method of the tack coat and seal coat of the pavement structure according to any one of claims 1 to 4, characterized in that: include: A spreading vehicle, the spreading vehicle comprising a first carrying plate; Asphalt foaming component, the asphalt foaming component is arranged on the first bearing plate, and the asphalt foaming component includes: A storage element, wherein the storage element has a first accommodating cavity (11) for accommodating asphalt; A foaming element, wherein the foaming element has a foaming cavity (15); the asphalt in the first containing cavity (11) can be transported into the foaming cavity (15); An injection element, the injection element is used to inject a foaming agent into the foaming cavity (15), the foaming cavity (15) is used to mix the foaming agent with the asphalt and foam to form foamed asphalt; A spreading assembly is used to spray the foamed asphalt onto the permeable layer (18), the asphalt lower layer, and the asphalt middle surface layer when the spreading vehicle is driving on the ground, so as to form the corresponding sealing layer (19) and the adhesive layer (20).

6. The foamed asphalt spreading device according to claim 5, characterized in that: The storage element and the foaming element are connected via a first delivery pipeline, and a first switch (12) and a first delivery pump (13) are also installed on the first delivery pipeline. The first switch (12) is used to control the connection / disconnection between the first accommodating cavity (11) and the foaming cavity (15). When the first switch (12) controls the connection between the first accommodating cavity (11) and the foaming cavity (15), the first delivery pump (13) is used to transport the asphalt in the first accommodating cavity (11) to the foaming cavity (15).

7. The foamed asphalt spreading device according to claim 5, characterized in that: The injection element has a second accommodating cavity (1) for accommodating the foaming agent; the injection element and the foaming element are connected via a second delivery pipe, and the second delivery pipe is also equipped with a second switch (3) and a second delivery pump (4); the second switch (3) is used to control the connection / disconnection between the second accommodating cavity (1) and the foaming cavity (15); when the second switch (3) controls the second accommodating cavity (1) and the foaming cavity (15) to be connected, the second delivery pump (4) is used to deliver the foaming agent in the second accommodating cavity (1) to the foaming cavity (15).

8. The foamed asphalt spreading device according to claim 5, characterized in that: The foaming element has a first outlet connected to the foaming cavity (15); the spreading assembly includes a spraying pipe (16) connected to the first outlet; the spraying pipe (16) is connected to a spraying head (17) at an end away from the first outlet; and the spraying pipe (16) is also connected in series with a flow regulating switch for regulating the flow of the foamed asphalt flowing in the spraying pipe (16).

9. The foamed asphalt spreading device according to claim 8, characterized in that: The spraying pipeline (16) is also provided with a mounting interface, and the mounting interface is used to install a pressure regulating element for regulating the pressure in the spraying pipeline (16).

10. The foamed asphalt spreading device according to claim 5, characterized in that: The storage element, the foaming element and the spreading assembly are also provided with a heating element, and the heating element is used to maintain the fluidity of the asphalt or the foamed asphalt.

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