Method and system for precise control of construction temperature of low-temperature modified asphalt

Abstract

The present invention discloses a method and system for precise control of construction temperature of low-temperature modified asphalt, which relates to the field of road engineering, including: establishing a model of the influence of road surface temperature on asphalt, establishing a model of the influence of air temperature on asphalt; generating at least one asphalt control temperature; obtaining the actual temperature range of asphalt; using the asphalt control temperature included in the paving temperature requirement range of the actual temperature range of asphalt as the paving control temperature; using the asphalt control temperature included in the rolling temperature requirement range of the actual temperature range of asphalt as the rolling control temperature; and controlling the initial temperature of asphalt during paving and rolling. By setting a model building module, a temperature generation module, a data calculation module, a data classification module, and a temperature control module, the comprehensive influence of road surface and air temperature on asphalt is considered, and the construction temperature is completely controlled under the condition of limiting costs, so that the construction effect reaches the expected effect.

Description

Technical Field

[0001] The present invention relates to the field of road engineering, and in particular to a method and system for accurately controlling the construction temperature of low-temperature modified asphalt. Background Art

[0002] Asphalt is a temperature-sensitive material, and temperature is the first factor that determines the performance and process characteristics of asphalt. The construction temperature of asphalt is the most important factor affecting the quality of asphalt pavement construction. During the construction process, it is necessary to strictly test and control the paving temperature and rolling temperature of asphalt to ensure the construction quality of double-layer paving, and thus meet the requirements of uniformity, compaction and flatness.

[0003] When asphalt is being constructed, it will be affected by the combined influence of road surface and air temperature, causing changes in asphalt temperature. The construction temperature may not meet the requirements of paving temperature and rolling temperature, resulting in the construction effect not achieving the expected effect. The existing technology lacks comprehensive consideration of the above factors. At the same time, when regulating, there is a lack of control over the regulation cost. Summary of the invention

[0004] In order to solve the above technical problems, a method and system for accurately controlling the construction temperature of low-temperature modified asphalt are provided. The technical solution solves the problem raised in the above background technology that when asphalt is constructed, it will be affected by the combined influence of road surface and air temperature, causing changes in asphalt temperature, and its construction temperature may not meet the requirements of paving temperature and rolling temperature, resulting in the construction effect failing to achieve the expected effect. The existing technology lacks comprehensive consideration of the above factors. At the same time, there is a lack of control over the regulation cost during regulation.

[0005] In order to achieve the above purpose, the technical solution adopted by the present invention is:

[0006] The method for accurately controlling the construction temperature of low-temperature modified asphalt includes:

[0007] Establish a model for the effect of road surface temperature on asphalt, and establish a model for the effect of air temperature on asphalt;

[0008] Obtain the required range of paving temperature during asphalt paving and the required range of rolling temperature during asphalt rolling;

[0009] Get the real-time air temperature and road surface temperature, and get the initial asphalt temperature;

[0010] Based on the initial temperature of the asphalt, generating at least one asphalt control temperature;

[0011] Under the conditions of asphalt control temperature and asphalt paving thickness, based on the impact model of road surface temperature on asphalt, the first impact temperature of the road surface on each point of asphalt is calculated, and based on the impact model of air temperature on asphalt, the second impact temperature of air on each point of asphalt is calculated;

[0012] Under the condition of asphalt temperature regulation, the actual temperature range of asphalt is obtained;

[0013] The asphalt control temperature whose actual asphalt temperature range is included in the required paving temperature range is used as the paving control temperature;

[0014] The asphalt control temperature included in the required rolling temperature range within the actual asphalt temperature range is used as the rolling control temperature;

[0015] Based on at least one paving control temperature and a rolling control temperature, the initial temperature of the asphalt is controlled during paving and rolling.

[0016] Preferably, the establishment of the model of the impact of road surface temperature on asphalt includes the following steps:

[0017] At least one sampling point is uniformly selected inside the asphalt, and the distance from the sampling point to the road surface is obtained as the sampling distance;

[0018] Obtaining a value range of the road surface temperature, dividing the value range of the road surface temperature at equal intervals, and obtaining at least one temperature point;

[0019] Under the condition that the asphalt is not in contact with the road surface, obtain the non-contact temperature at the sampling point;

[0020] Under the condition that the asphalt is in contact with the road surface having a temperature equal to the value at the temperature point, the contact temperature at the sampling point is obtained;

[0021] The contact temperature minus the non-contact temperature is used to obtain the first change temperature;

[0022] Randomly combining temperature points and sampling distances to obtain at least one first pairing group;

[0023] Assigning the first changed temperature corresponding to the sampling point whose distance to the road surface is equal to the sampling distance in the first paired group to the first paired group;

[0024] The first pairing group and its corresponding first changed temperature are fitted to obtain a first fitting function, wherein the temperature point and the sampling distance are independent variables, and the first changed temperature is a dependent variable.

[0025] Preferably, the establishment of the air temperature effect model on asphalt comprises the following steps:

[0026] At least one sampling point is uniformly selected inside the asphalt, and the distance from the sampling point to the upper surface of the asphalt is obtained as the sampling distance;

[0027] Obtaining a value range of the air temperature, dividing the value range of the air temperature at equal intervals, and obtaining at least one identification point;

[0028] Under the condition that the asphalt is in contact with air whose temperature is equal to 0, a second non-contact temperature at the sampling point is obtained;

[0029] Under the condition that the upper surface of the asphalt is in contact with air having a temperature equal to the value at the identification point and the lower surface of the asphalt is in contact with air having a temperature equal to 0, obtaining a second contact temperature at the sampling point;

[0030] The second contact temperature is subtracted from the second non-contact temperature to obtain a second changed temperature;

[0031] Randomly combine the temperature points and the sampling distances to obtain at least one second pairing group; assign the second changed temperature corresponding to the sampling point whose distance to the upper surface of the asphalt is equal to the sampling distance in the second pairing group to the second pairing group;

[0032] The second pairing group and its corresponding second changed temperature are fitted to obtain a second fitting function, wherein the identification point and the sampling distance are independent variables, and the second changed temperature is the dependent variable.

[0033] Preferably, generating at least one asphalt control temperature based on the initial asphalt temperature comprises the following steps:

[0034] Based on historical data, the maximum value of the temperature error allowed for the construction temperature is obtained as the preset temperature;

[0035] Based on the preset temperature, a control sequence a, 2a, ..., na is generated, where n is the number of items in the control sequence, and (b-na, b+na) contains the temperature variation range during asphalt construction, b is the initial temperature of asphalt, and a is the preset temperature;

[0036] Ba, b-2a, ..., b-na and b+a, b+2a, ..., b+na are used as at least one asphalt control temperature. Preferably, the first impact temperature of each point of the asphalt on the road surface temperature is calculated based on the impact model of the road surface temperature on the asphalt, including the following steps:

[0037] Coordinate modeling of points in the asphalt is performed, and the equation of the lower surface of the asphalt is obtained based on the coordinates of the points on the lower surface of the asphalt;

[0038] The minimum distance from a point in the asphalt to the lower surface of the asphalt is calculated as the first point distance;

[0039] Substitute the first point distance and the real-time road surface temperature into the first fitting function to obtain the first influencing temperature.

[0040] Preferably, the method of calculating the second impact temperature of air on each point of asphalt based on the impact model of air temperature on asphalt comprises the following steps:

[0041] Substitute the first point distance and the real-time air temperature into the second fitting function to obtain the second impact temperature.

[0042] Preferably, obtaining the actual temperature range of asphalt under the condition of regulating the temperature of asphalt comprises the following steps:

[0043] Superimpose the asphalt control temperature with the first influence temperature and the second influence temperature of the point in the asphalt at the same coordinates to obtain the actual temperature of the asphalt, and pair it with the point in the asphalt;

[0044] A temperature interval is formed and the temperature interval is used as the actual temperature range of the asphalt, wherein the minimum value of the actual temperature of the asphalt at a point in the asphalt is the left endpoint of the temperature interval and the maximum value of the actual temperature of the asphalt at a point in the asphalt is the right endpoint.

[0045] Preferably, the temperature control of the initial temperature of asphalt during paving and rolling based on at least one paving control temperature and rolling control temperature comprises the following steps: based on historical data, estimating the time consumed for asphalt paving as the paving time, estimating the time consumed for asphalt rolling as the rolling time;

[0046] Based on historical data, the energy of unit mass of asphalt in unit time to maintain the paving temperature is obtained as unit paving energy;

[0047] Based on historical data, the energy of maintaining rolling temperature of unit mass of asphalt per unit time is obtained as unit rolling energy;

[0048] Use the energy consumption formula to calculate the total energy consumption of asphalt temperature control, and obtain the paving control temperature and rolling control temperature when the total energy consumption of asphalt temperature control takes the minimum value, as the target paving control temperature and target rolling control temperature;

[0049] When paving, the construction temperature of asphalt is adjusted from the initial temperature of asphalt to the target paving control temperature;

[0050] During rolling, the construction temperature of the asphalt is adjusted from the initial temperature of the asphalt to the target rolling control temperature;

[0051] The energy consumption formula is as follows:

[0052] Among them, Q is the total energy consumption of asphalt temperature control, c is the specific heat capacity of asphalt, m is the mass of asphalt, To control the temperature for paving, is the rolling temperature control, T is the initial temperature of asphalt, For paving time, The energy for each unit is spread, To crush time, The unit crushing energy.

[0053] The system for precise control of construction temperature of low-temperature modified asphalt is used to implement the above-mentioned precise control method of construction temperature of low-temperature modified asphalt, including: a model building module, the model building module builds a model of the influence of road surface temperature on asphalt, and builds a model of the influence of air temperature on asphalt;

[0054] A data acquisition module, wherein the data acquisition module acquires a required range of paving temperature during asphalt paving, acquires a required range of rolling temperature during asphalt rolling, acquires real-time air temperature and real-time road surface temperature, and acquires an initial temperature of asphalt;

[0055] A temperature generation module, wherein the temperature generation module generates at least one asphalt control temperature based on the initial temperature of the asphalt;

[0056] A data calculation module, which calculates the first impact temperature of the road surface on each point of the asphalt based on the impact model of the road surface temperature on the asphalt under the conditions of the asphalt control temperature and the asphalt laying thickness, and calculates the second impact temperature of the air on each point of the asphalt based on the impact model of the air temperature on the asphalt; a temperature acquisition module, which obtains the actual temperature range of the asphalt under the condition of the asphalt control temperature;

[0057] A data classification module, wherein the data classification module uses the asphalt control temperature included in the paving temperature requirement range within the asphalt actual temperature range as the paving control temperature, and uses the asphalt control temperature included in the rolling temperature requirement range within the asphalt actual temperature range as the rolling control temperature;

[0058] A temperature control module is used to control the initial temperature of the asphalt during paving and rolling based on at least one paving control temperature and a rolling control temperature.

[0059] Compared with the prior art, the present invention has the following beneficial effects:

[0060] By setting up a model building module, a temperature generation module, a data calculation module, a data classification module and a temperature control module, the comprehensive impact of the road surface and air temperature on asphalt is considered, and its actual temperature under the influence of the two is obtained, and then it is controlled to a temperature that meets the requirements of the paving temperature and the rolling temperature. At the same time, when performing temperature control, cost control is taken into consideration and the most economical solution is used for temperature control. Under the condition of limiting costs, the construction temperature is completely regulated so that the construction effect reaches the expected effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] Figure 1 It is a schematic diagram of the process of the method for accurately controlling the construction temperature of low-temperature modified asphalt of the present invention;

[0062] Figure 2 It is a schematic diagram of the process of establishing a model of the influence of road surface temperature on asphalt according to the present invention;

[0063] Figure 3 A schematic diagram of a flow chart of establishing a model of the influence of air temperature on asphalt according to the present invention;

[0064] Figure 4 A schematic diagram of a process for generating at least one asphalt control temperature based on the initial temperature of the asphalt according to the present invention;

[0065] Figure 5 It is a flow chart of calculating the first impact temperature of each point of asphalt on the road surface based on the impact model of the road surface temperature on asphalt of the present invention;

[0066] Figure 6 It is a schematic diagram of a process for obtaining the actual temperature range of asphalt under the condition of regulating the temperature of asphalt in the present invention;

[0067] Figure 7 The present invention is a schematic flow chart of temperature control of the initial temperature of asphalt during paving and rolling based on at least one paving control temperature and a rolling control temperature. DETAILED DESCRIPTION

[0068] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art may think of other obvious variations.

[0069] Reference Figure 1 As shown, the method for accurately controlling the construction temperature of low-temperature modified asphalt includes: establishing a model for the influence of pavement temperature on asphalt, and establishing a model for the influence of air temperature on asphalt;

[0070] Obtain the required range of paving temperature during asphalt paving and the required range of rolling temperature during asphalt rolling;

[0071] Get the real-time air temperature and road surface temperature, and get the initial asphalt temperature;

[0072] Based on the initial temperature of the asphalt, generating at least one asphalt control temperature;

[0073] Under the conditions of asphalt control temperature and asphalt paving thickness, based on the impact model of road surface temperature on asphalt, the first impact temperature of the road surface on each point of asphalt is calculated, and based on the impact model of air temperature on asphalt, the second impact temperature of air on each point of asphalt is calculated;

[0074] Under the condition of asphalt temperature regulation, the actual temperature range of asphalt is obtained;

[0075] The asphalt control temperature whose actual asphalt temperature range is included in the required paving temperature range is used as the paving control temperature;

[0076] The asphalt control temperature included in the required rolling temperature range within the actual asphalt temperature range is used as the rolling control temperature;

[0077] Based on at least one paving control temperature and a rolling control temperature, the initial temperature of the asphalt is controlled during paving and rolling.

[0078] In this scheme, the influence of air temperature and road surface temperature on asphalt is comprehensively analyzed, but the temperature inside asphalt is difficult to measure. Therefore, by establishing a module to establish a model of the influence of road surface temperature on asphalt and a model of the influence of air temperature on asphalt, the influence of air temperature and road surface temperature on the inside of asphalt is analyzed, and then the overall temperature of asphalt is obtained, so that temperature control can be completed more accurately.

[0079] In addition, asphalt has different temperature requirements when paving and rolling. Therefore, targeted temperature adjustments are needed, and the corresponding temperatures need to be maintained during paving and rolling. However, energy consumption and corresponding expenses will be generated during temperature control and temperature maintenance. In order to make the control more economical, it is necessary to choose the method with the least energy consumption. This solution is formed to solve the above problems.

[0080] Reference Figure 2 As shown in Figure 1, establishing a model for the impact of pavement temperature on asphalt includes the following steps:

[0081] At least one sampling point is uniformly selected inside the asphalt, and the distance from the sampling point to the road surface is obtained as the sampling distance;

[0082] Obtaining a value range of the road surface temperature, dividing the value range of the road surface temperature at equal intervals, and obtaining at least one temperature point;

[0083] Under the condition that the asphalt is not in contact with the road surface, obtain the non-contact temperature at the sampling point;

[0084] Under the condition that the asphalt is in contact with the road surface having a temperature equal to the value at the temperature point, the contact temperature at the sampling point is obtained;

[0085] The contact temperature minus the non-contact temperature is used to obtain the first change temperature;

[0086] Randomly combining temperature points and sampling distances to obtain at least one first pairing group;

[0087] Assigning the first changed temperature corresponding to the sampling point whose distance to the road surface is equal to the sampling distance in the first pairing group to the first pairing group;

[0088] The first pairing group and its corresponding first changed temperature are fitted to obtain a first fitting function, in which the temperature point and the sampling distance are independent variables, and the first changed temperature is the dependent variable. By establishing a model for the impact of road surface temperature on asphalt, the impact of road surface temperature on the temperature of asphalt at different distances from the road surface can be estimated, and then in subsequent analysis, the impact on the change of temperature can be integrated. When the model is established, the variable control method is adopted to obtain the degree of change of the road surface temperature on the points inside the asphalt.

[0089] Reference Figure 3 As shown in the figure, establishing the model of the effect of air temperature on asphalt includes the following steps:

[0090] At least one sampling point is uniformly selected inside the asphalt, and the distance from the sampling point to the upper surface of the asphalt is obtained as the sampling distance;

[0091] Obtaining a value range of the air temperature, dividing the value range of the air temperature at equal intervals, and obtaining at least one identification point;

[0092] Under the condition that the asphalt is in contact with air whose temperature is equal to 0, a second non-contact temperature at the sampling point is obtained;

[0093] Under the condition that the upper surface of the asphalt is in contact with air having a temperature equal to the value at the identification point and the lower surface of the asphalt is in contact with air having a temperature equal to 0, obtaining a second contact temperature at the sampling point;

[0094] The second contact temperature is subtracted from the second non-contact temperature to obtain a second changed temperature;

[0095] Randomly combining the temperature points and the sampling distances to obtain at least one second pairing group;

[0096] Assigning the second changed temperature corresponding to the sampling point whose distance to the upper surface of the asphalt is equal to the sampling distance in the second pairing group to the second pairing group;

[0097] The second pairing group and its corresponding second changed temperature are fitted to obtain a second fitting function, wherein the identification point and the sampling distance are independent variables, and the second changed temperature is the dependent variable.

[0098] During construction, the influence of air on asphalt mainly comes from the upper surface. Therefore, only the distance from the point in the asphalt to the upper surface is considered. At the same time, in order to control the variables, at least one poor thermal conductor is used to hang the asphalt in the air to separate the air between the upper and lower surfaces of the asphalt, and keep the air temperature on the lower surface of the asphalt at 0. Then, the change of the air temperature on the upper surface of the asphalt with respect to the temperature of the points inside the asphalt can be obtained, and then the second fitting function is fitted.

[0099] Reference Figure 4 As shown, based on the initial temperature of the asphalt, generating at least one asphalt control temperature includes the following steps: based on historical data, obtaining the maximum value of the temperature error allowed by the construction temperature as the preset temperature;

[0100] Based on the preset temperature, a control sequence a, 2a, ..., na is generated, where n is the number of items in the control sequence, and (b-na, b+na) contains the temperature variation range during asphalt construction, b is the initial temperature of asphalt, and a is the preset temperature;

[0101] Ba, b-2a, ..., b-na and b+a, b+2a, ..., b+na are used as at least one asphalt control temperature. The asphalt control temperature is used to subsequently control the initial asphalt temperature. Since the interval between adjacent asphalt control temperatures is an error allowable value, the initial asphalt temperature is controlled using the asphalt control temperature that meets the requirements, and its accuracy meets the requirements.

[0102] Reference Figure 5 As shown, based on the influence model of road surface temperature on asphalt, calculating the first influence temperature of the road surface on each point of asphalt includes the following steps:

[0103] Coordinate modeling of points in the asphalt is performed, and the equation of the lower surface of the asphalt is obtained based on the coordinates of the points on the lower surface of the asphalt;

[0104] The minimum distance from a point in the asphalt to the lower surface of the asphalt is calculated as the first point distance;

[0105] Substitute the first point distance and the real-time road surface temperature into the first fitting function to obtain the first influencing temperature.

[0106] Based on the model of the influence of air temperature on asphalt, calculating the second influence temperature of air on each point of asphalt includes the following steps:

[0107] Substitute the first point distance and the real-time air temperature into the second fitting function to obtain the second impact temperature.

[0108] Reference Figure 6 As shown, under the condition of asphalt temperature control, obtaining the actual temperature range of asphalt includes the following steps:

[0109] The asphalt control temperature is superimposed with the first influence temperature and the second influence temperature of the point in the asphalt at the same coordinates to obtain the actual temperature of the asphalt, and paired with the point in the asphalt;

[0110] A temperature interval is formed and the temperature interval is used as the actual temperature range of the asphalt, wherein the minimum actual temperature of the asphalt point in the asphalt is the left end point of the temperature interval, and the maximum actual temperature of the asphalt point in the asphalt is the right end point. The road surface temperature and air temperature will affect the temperature of the points inside the asphalt respectively, so superimposing them at the points with the same coordinates can obtain a comprehensive effect. Since it is necessary to determine whether it meets the corresponding construction temperature requirements, it is necessary to obtain the temperature range of all points in the asphalt.

[0111] Reference Figure 7 As shown, based on at least one paving control temperature and rolling control temperature, the temperature control of the initial temperature of asphalt during paving and rolling includes the following steps:

[0112] Based on historical data, the estimated time required for asphalt paving is used as the paving time, and the estimated time required for asphalt rolling is used as the rolling time;

[0113] Based on historical data, the energy of unit mass of asphalt per unit time to maintain the paving temperature is obtained as unit paving energy;

[0114] Based on historical data, the energy of maintaining rolling temperature of unit mass of asphalt per unit time is obtained as unit rolling energy;

[0115] Use the energy consumption formula to calculate the total energy consumption of asphalt temperature control, and obtain the paving control temperature and rolling control temperature when the total energy consumption of asphalt temperature control takes the minimum value, as the target paving control temperature and target rolling control temperature;

[0116] When paving, the construction temperature of asphalt is adjusted from the initial temperature of asphalt to the target paving control temperature;

[0117] During rolling, the construction temperature of the asphalt is adjusted from the initial temperature of the asphalt to the target rolling control temperature;

[0118] The energy consumption formula is as follows:

[0119] Among them, Q is the total energy consumption of asphalt temperature control, c is the specific heat capacity of asphalt, m is the mass of asphalt, To control the temperature for paving, is the rolling temperature control, T is the initial temperature of asphalt, For paving time, The energy for each unit is spread, To crush time, The unit crushing energy.

[0120] During construction, paving is carried out first, followed by rolling. When adjusting and controlling, the greater the temperature adjustment range, the greater the energy consumption. At the same time, the energy consumption for maintaining the temperature is different at different temperatures. Therefore, in order to control the economy, it is necessary to cost the scheme that meets the paving and rolling temperature requirements. Since the cost is proportional to the energy consumption, the energy is calculated to obtain the scheme with the lowest cost. When this scheme is used for adjustment and control, the cost can be effectively controlled.

[0121] The construction temperature precision control system for low-temperature modified asphalt is used to realize the above-mentioned construction temperature precision control method for low-temperature modified asphalt, including:

[0122] A model building module, the model building module builds a model of the influence of road surface temperature on asphalt, and builds a model of the influence of air temperature on asphalt; a data acquisition module, the data acquisition module acquires the required range of paving temperature during asphalt paving, acquires the required range of rolling temperature during asphalt rolling, acquires the real-time air temperature and the real-time road surface temperature, and acquires the initial temperature of asphalt;

[0123] A temperature generation module, wherein the temperature generation module generates at least one asphalt control temperature based on the initial temperature of the asphalt;

[0124] A data calculation module, which calculates a first impact temperature of the road surface on each point of the asphalt based on an impact model of the road surface temperature on the asphalt under the conditions of the asphalt control temperature and the asphalt laying thickness, and calculates a second impact temperature of the air on each point of the asphalt based on an impact model of the air temperature on the asphalt;

[0125] A temperature acquisition module, wherein the temperature acquisition module obtains the actual temperature range of the asphalt under the condition that the asphalt temperature is controlled;

[0126] A data classification module, wherein the data classification module uses the asphalt control temperature included in the paving temperature requirement range within the asphalt actual temperature range as the paving control temperature, and uses the asphalt control temperature included in the rolling temperature requirement range within the asphalt actual temperature range as the rolling control temperature;

[0127] A temperature control module is used to control the initial temperature of the asphalt during paving and rolling based on at least one paving control temperature and a rolling control temperature.

[0128] Furthermore, the present solution also proposes a storage medium on which a computer-readable program is stored. When the computer-readable program is called, the above-mentioned method for accurately controlling the construction temperature of low-temperature modified asphalt is executed.

[0129] It is understandable that the storage medium can be a magnetic medium, such as a floppy disk, a hard disk, a magnetic tape; an optical medium, such as a DVD; or a semiconductor medium, such as a solid state disk Solid State Disk, SSD, etc. In summary, the advantages of the present invention are: by setting a model building module, a temperature generation module, a data calculation module, a data classification module and a temperature control module, the comprehensive influence of the road surface and air temperature on the asphalt is considered, and its actual temperature under the action of the two is obtained, and then it is controlled to a temperature that meets the requirements of the paving temperature and the rolling temperature. At the same time, when performing temperature control, considering the cost control, the most economical solution is used for temperature control. Under the condition of limiting the cost, the construction temperature is completely regulated, so that the construction effect reaches the expected effect.

[0130] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection claimed by the present invention is defined by the attached claims and their equivalents.

Claims

1. A method for accurately controlling the construction temperature of low-temperature modified asphalt, characterized in that: include: Establish a model for the effect of road surface temperature on asphalt, and establish a model for the effect of air temperature on asphalt; Obtain the required range of paving temperature during asphalt paving and the required range of rolling temperature during asphalt rolling; Get the real-time air temperature and road surface temperature, and get the initial asphalt temperature; Based on the initial temperature of the asphalt, generating at least one asphalt control temperature; Under the conditions of asphalt control temperature and asphalt paving thickness, based on the impact model of road surface temperature on asphalt, the first impact temperature of the road surface on each point of asphalt is calculated, and based on the impact model of air temperature on asphalt, the second impact temperature of air on each point of asphalt is calculated; Under the condition of asphalt temperature regulation, the actual temperature range of asphalt is obtained; The asphalt control temperature whose actual asphalt temperature range is included in the required paving temperature range is used as the paving control temperature; The asphalt control temperature included in the rolling temperature requirement range within the actual asphalt temperature range is used as the rolling control temperature; Based on at least one paving control temperature and a rolling control temperature, the initial temperature of the asphalt is controlled during paving and rolling; Under the condition of regulating the temperature of asphalt, obtaining the actual temperature range of asphalt comprises the following steps: Superimpose the asphalt control temperature with the first influence temperature and the second influence temperature of the point in the asphalt at the same coordinates to obtain the actual temperature of the asphalt, and pair it with the point in the asphalt; Form a temperature interval, and use the temperature interval as the actual temperature range of the asphalt, wherein the minimum value of the actual temperature of the asphalt at the point in the asphalt is the left end point of the temperature interval, and the maximum value of the actual temperature of the asphalt at the point in the asphalt is the right end point; The temperature control of the initial temperature of asphalt during paving and rolling based on at least one paving control temperature and rolling control temperature comprises the following steps: Based on historical data, the estimated time required for asphalt paving is used as the paving time, and the estimated time required for asphalt rolling is used as the rolling time; Based on historical data, the energy of unit mass of asphalt in unit time to maintain the paving temperature is obtained as unit paving energy; Based on historical data, the energy of maintaining rolling temperature of unit mass of asphalt per unit time is obtained as unit rolling energy; Use the energy consumption formula to calculate the total energy consumption of asphalt temperature control, and obtain the paving control temperature and rolling control temperature when the total energy consumption of asphalt temperature control takes the minimum value, as the target paving control temperature and target rolling control temperature; When paving, the construction temperature of asphalt is adjusted from the initial temperature of asphalt to the target paving control temperature; During rolling, the construction temperature of the asphalt is adjusted from the initial temperature of the asphalt to the target rolling control temperature; The energy consumption formula is as follows: Among them, Q is the total energy consumption of asphalt temperature control, c is the specific heat capacity of asphalt, m is the mass of asphalt, To control the temperature for paving, is the rolling temperature control, T is the initial temperature of asphalt, For paving time, The energy for each unit is spread, To crush time, The unit crushing energy.

2. The method for accurately controlling the construction temperature of low-temperature modified asphalt according to claim 1, characterized in that: The establishment of the model of the influence of road surface temperature on asphalt comprises the following steps: At least one sampling point is uniformly selected inside the asphalt, and the distance from the sampling point to the road surface is obtained as the sampling distance; Obtaining a value range of the road surface temperature, dividing the value range of the road surface temperature at equal intervals, and obtaining at least one temperature point; Under the condition that the asphalt is not in contact with the road surface, obtain the non-contact temperature at the sampling point; Under the condition that the asphalt is in contact with the road surface at a temperature equal to the value at the temperature point, the contact temperature at the sampling point is obtained; The contact temperature minus the non-contact temperature is used to obtain the first change temperature; Randomly combining temperature points and sampling distances to obtain at least one first pairing group; Assigning the first changed temperature corresponding to the sampling point whose distance to the road surface is equal to the sampling distance in the first paired group to the first paired group; The first pairing group and its corresponding first changed temperature are fitted to obtain a first fitting function, wherein the temperature point and the sampling distance are independent variables, and the first changed temperature is a dependent variable.

3. The method for accurately controlling the construction temperature of low-temperature modified asphalt according to claim 2, characterized in that: The establishment of the air temperature influence model on asphalt comprises the following steps: uniformly taking at least one sampling point inside the asphalt, obtaining the distance from the sampling point to the upper surface of the asphalt as the sampling distance; Obtaining a value range of the air temperature, dividing the value range of the air temperature at equal intervals, and obtaining at least one identification point; Under the condition that the asphalt is in contact with air whose temperature is equal to 0, a second non-contact temperature at the sampling point is obtained; Under the condition that the upper surface of the asphalt is in contact with air having a temperature equal to the value at the identification point and the lower surface of the asphalt is in contact with air having a temperature equal to 0, obtaining a second contact temperature at the sampling point; The second contact temperature is subtracted from the second non-contact temperature to obtain a second changed temperature; Randomly combining the temperature points and the sampling distances to obtain at least one second pairing group; Assigning the second changed temperature corresponding to the sampling point whose distance to the upper surface of the asphalt is equal to the sampling distance in the second pairing group to the second pairing group; The second pairing group and its corresponding second changed temperature are fitted to obtain a second fitting function, wherein the identification point and the sampling distance are independent variables, and the second changed temperature is the dependent variable.

4. The method for accurately controlling the construction temperature of low-temperature modified asphalt according to claim 3, characterized in that: The step of generating at least one asphalt control temperature based on the initial asphalt temperature comprises the following steps: Based on historical data, the maximum value of the temperature error allowed for the construction temperature is obtained as the preset temperature; Based on the preset temperature, a control sequence a, 2a, ..., na is generated, where n is the number of items in the control sequence, and (b-na, b+na) contains the temperature variation range during asphalt construction, b is the initial temperature of asphalt, and a is the preset temperature; ba, b-2a, ..., b-na and b+a, b+2a, ..., b+na are used as at least one asphalt control temperature.

5. The method for accurately controlling the construction temperature of low-temperature modified asphalt according to claim 4, characterized in that: The method of calculating the first impact temperature of the road surface on each point of the asphalt based on the impact model of the road surface temperature on the asphalt comprises the following steps: Coordinate modeling of points in the asphalt is performed, and the equation of the lower surface of the asphalt is obtained based on the coordinates of the points on the lower surface of the asphalt; The minimum distance from a point in the asphalt to the lower surface of the asphalt is calculated as the first point distance; Substitute the first point distance and the real-time road surface temperature into the first fitting function to obtain the first influencing temperature.

6. The method for accurately controlling the construction temperature of low-temperature modified asphalt according to claim 5, characterized in that: The method of calculating the second impact temperature of air on each point of asphalt based on the impact model of air temperature on asphalt includes the following steps: Substitute the first point distance and the real-time air temperature into the second fitting function to obtain the second impact temperature.

7. A system for accurately controlling the construction temperature of low-temperature modified asphalt, used to implement the method for accurately controlling the construction temperature of low-temperature modified asphalt as claimed in any one of claims 1 to 6, characterized in that: include: A model building module, wherein the model building module builds a model of the influence of road surface temperature on asphalt and a model of the influence of air temperature on asphalt; A data acquisition module, wherein the data acquisition module acquires a required range of paving temperature during asphalt paving, acquires a required range of rolling temperature during asphalt rolling, acquires real-time air temperature and real-time road surface temperature, and acquires an initial temperature of asphalt; A temperature generation module, wherein the temperature generation module generates at least one asphalt control temperature based on the initial temperature of the asphalt; A data calculation module, which calculates a first impact temperature of the road surface on each point of the asphalt based on an impact model of the road surface temperature on the asphalt under the conditions of the asphalt control temperature and the asphalt laying thickness, and calculates a second impact temperature of the air on each point of the asphalt based on an impact model of the air temperature on the asphalt; A temperature acquisition module, wherein the temperature acquisition module obtains the actual temperature range of the asphalt under the condition that the asphalt temperature is controlled; A data classification module, wherein the data classification module uses the asphalt control temperature included in the paving temperature requirement range within the asphalt actual temperature range as the paving control temperature, and uses the asphalt control temperature included in the rolling temperature requirement range within the asphalt actual temperature range as the rolling control temperature; A temperature control module, wherein the temperature control module controls the initial temperature of the asphalt during paving and rolling based on at least one paving control temperature and a rolling control temperature; Under the condition of regulating the temperature of asphalt, obtaining the actual temperature range of asphalt comprises the following steps: Superimpose the asphalt control temperature with the first influence temperature and the second influence temperature of the point in the asphalt at the same coordinates to obtain the actual temperature of the asphalt, and pair it with the point in the asphalt; Form a temperature interval, and use the temperature interval as the actual temperature range of the asphalt, wherein the minimum value of the actual temperature of the asphalt at the point in the asphalt is the left end point of the temperature interval, and the maximum value of the actual temperature of the asphalt at the point in the asphalt is the right end point; The temperature control of the initial temperature of asphalt during paving and rolling based on at least one paving control temperature and rolling control temperature comprises the following steps: Based on historical data, the estimated time required for asphalt paving is used as the paving time, and the estimated time required for asphalt rolling is used as the rolling time; Based on historical data, the energy of unit mass of asphalt in unit time to maintain the paving temperature is obtained as unit paving energy; Based on historical data, the energy of maintaining rolling temperature of unit mass of asphalt per unit time is obtained as unit rolling energy; Use the energy consumption formula to calculate the total energy consumption of asphalt temperature control, and obtain the paving control temperature and rolling control temperature when the total energy consumption of asphalt temperature control takes the minimum value, as the target paving control temperature and target rolling control temperature; When paving, the construction temperature of asphalt is adjusted from the initial temperature of asphalt to the target paving control temperature; During rolling, the construction temperature of the asphalt is adjusted from the initial temperature of the asphalt to the target rolling control temperature; The energy consumption formula is as follows: Among them, Q is the total energy consumption of asphalt temperature control, c is the specific heat capacity of asphalt, m is the mass of asphalt, To control the temperature for paving, is the rolling temperature control, T is the initial temperature of asphalt, For paving time, The energy for each unit is spread, To crush time, The unit crushing energy.

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