A flexible anti-cracking seal coat asphalt spraying system and a spraying amount control method thereof

Abstract

A flexible crack-resistant asphalt spraying system and its spraying volume control method are disclosed. The spraying system includes multiple nozzles, which are alternately arranged in the longitudinal direction to form at least two rows of nozzle valve groups. The nozzles are evenly spaced in the transverse direction, and the interval between adjacent nozzles in the transverse direction is a fraction of the asphalt distribution width of a single nozzle. The nozzle spraying volume control method includes: nozzle setup, control of the asphalt distribution width sprayed by the nozzles, calculation of the horizontal motion enhancement factor of asphalt under horizontal movement, and calculation of the width of the nozzle sprayed to the ground. Based on the initial spraying angle of the nozzle, combined with the flow enhancement factor, polymerization critical velocity, kinetic energy transfer angle, and factors affecting the asphalt spraying width during the asphalt spraying process, the spraying width of the trapezoidal nozzle is calculated. This facilitates the adjustment of the nozzle height and spraying pressure to ensure the uniformity of asphalt spraying and accurately control the spraying volume per square meter.

Description

Technical Field

[0001] This invention relates to the fields of bridge engineering, tunnel engineering and road engineering, and more specifically, to the fields of bridge deck waterproofing, tunnel waterproofing, and road sealing design and manufacturing (including modified asphalt waterproof coatings, polyurethane waterproof coatings and waterproof membranes), and particularly to a flexible crack-resistant sealing asphalt spraying system and its spraying volume control method. Background Technology

[0002] Road seals and bridge / tunnel waterproofing layers both play crucial roles in the structural protection of roads and bridges. Road seals, by covering a thin layer of asphalt or other materials, provide waterproofing, crack prevention, and abrasion resistance, effectively preventing moisture and salt from penetrating the pavement structure and reducing frost heave and crack propagation caused by water infiltration. Simultaneously, they improve the pavement's skid resistance and durability, reducing road maintenance frequency and extending road lifespan. Bridge / tunnel waterproofing layers primarily prevent rainwater and snowmelt from penetrating the concrete structure, avoiding corrosion and damage to reinforced concrete, reducing frost heave and crack propagation, and ensuring the long-term stability of bridges. By reducing moisture damage, waterproofing layers effectively lower maintenance costs and significantly extend the lifespan of bridges and tunnels. Both share a common goal in structural protection: reducing the impact of environmental factors on roads, bridges, and tunnels, ensuring the long-term safety and stable operation of transportation facilities. In recent years, with the research and application of high-performance flexible crack-resistant seals, their toughness and waterproofing performance far exceed traditional waterproof coatings, leading to their expanded application in bridge and tunnel waterproofing layers.

[0003] In the current construction of road seal and bridge waterproofing layers, seal trucks equipped with asphalt storage tanks and spraying systems are used. However, the uniformity of spraying and thickness control have always been key factors affecting construction quality and efficiency during the construction of asphalt seal or bridge waterproofing layers. Traditional spraying methods are easily constrained by environmental factors and equipment performance, leading to uneven asphalt spraying, which in turn affects the crack resistance and durability of the road surface. In addition, controlling the seal thickness also faces challenges. A seal that is too thin may not be able to fully exert its waterproofing effect, leading to water seepage in the road surface, bridge deck, and tunnels, and in severe cases, damage to the road surface and bridge deck; while a seal that is too thick will result in resource waste and low interface strength. Therefore, how to accurately control the seal thickness while ensuring spray uniformity has become a technical problem that the industry urgently needs to solve.

[0004] Therefore, there is an urgent need for a spraying control method that can effectively ensure the uniformity of asphalt spraying and accurately control the spraying amount by adjusting the pressure. Summary of the Invention

[0005] This invention provides a flexible crack-resistant asphalt spraying system. The asphalt spraying system is used to uniformly spray asphalt. The flexible crack-resistant asphalt spraying system includes: multiple nozzles, the width of the asphalt sprayed by each nozzle is L, the nozzles are alternately arranged in the longitudinal direction to form at least two rows of nozzle valve groups to eliminate the unevenness of the spraying, the nozzles are uniformly spaced in the transverse direction, and the spacing between adjacent nozzles in the transverse direction of the nozzle valve group is a fraction of the width of the asphalt sprayed by a single nozzle.

[0006] This invention also provides a method for controlling the spraying volume of an asphalt spraying system. The aforementioned flexible crack-resistant asphalt spraying system is manufactured based on the method for controlling the spraying volume of the asphalt spraying system, wherein the method for controlling the spraying volume includes:

[0007] S1. Nozzle setup: The nozzles are alternately arranged in the longitudinal direction and the distance between adjacent nozzles in the longitudinal direction is S. The nozzles are evenly spaced in the transverse direction and the distance between adjacent nozzles in the transverse direction of the nozzle valve group is a fraction of the width of the asphalt sprayed by a single nozzle. The nozzles include trapezoidal nozzles with a height h, an upper bottom edge width a, a lower bottom edge width b, and a nozzle outlet thickness W.

[0008] S2. Distribution width of asphalt sprayed by the nozzle: Calculate the initial spray angle of the trapezoidal nozzle based on its dimensions, and base this on the flow enhancement factor η and the critical polymerization velocity V. c and the angle of kinetic energy transfer θ d Calculate the diffusion angle θ of asphalt after it leaves the nozzle, considering the effect of the gradual expansion of the asphalt path cross-section during asphalt spraying. t ;

[0009] S3, Horizontal movement enhancement factor of asphalt under horizontal movement conditions: When the nozzle on the sealing vehicle moves at V... h When moving at a horizontal velocity, the asphalt diffuses to both sides under the influence of the horizontal velocity. Based on the diffusion increment coefficient φ and the influence of jet stiffness on the asphalt, the horizontal motion enhancement factor β of the asphalt under the influence of the horizontal velocity can be obtained as 1+φS.

[0010] S4. Width of the asphalt sprayed from the nozzle to the ground: Based on steps S1, S2, and S3, the width of the asphalt sprayed from a single nozzle is L = b + Htan(θ). t )β.

[0011] Preferably, in step S1, the spray angle of the nozzle is...

[0012] Preferably, in step S2, the selection of the flow enhancement factor η includes the following steps:

[0013] S201, Calculation of hydraulic diameter: The hydraulic diameter of the asphalt within the nozzle. Where A is the cross-sectional area of ​​the water passage, P is the wetted perimeter, i.e., the total perimeter of the fluid in contact with the wall; and m is the slope coefficient.

[0014] S202. Selection of Reynolds Number: The Reynolds number reflects the ratio of inertial force to viscous force in a fluid. Where ρ is the density of asphalt, and V j For asphalt flow velocity and In the formula, Q is the flow rate, A is the nozzle outlet area, W is the nozzle outlet thickness, and μ is the asphalt viscosity. P is the jet pressure, C d For flow coefficient;

[0015] S203, Flow enhancement factor η: Where C and n are constants that need to be determined through experiments or data fitting, C represents the overall drag effect, n represents the flow characteristics, indicating the sensitivity of flow enhancement to changes in Reynolds number, and R... e0 To enhance the critical point of the initial Reynolds number.

[0016] Preferably, in step S2, the polymerization critical rate Where V c λ is the critical velocity, σ is the surface tension, which reflects the attractive force between fluid molecules, and λ is an empirical correction coefficient.

[0017] Preferably, in step S2, the kinetic energy transfer angle Where θ d The momentum transfer angle represents the degree of fluid diffusion.

[0018] Preferably, in step S3, the time t from when the asphalt is sprayed from the nozzle to when it hits the ground is calculated as follows:

[0019] Preferably, the diffusion increment coefficient φ is proportional to the energy ratio R. E The product of the falling time is

[0020] but Where k1 is the asphalt diffusion correction coefficient, so that the diffusion increment coefficient φ is equal to the product of the asphalt's stable energy, the energy ratio of relative wind kinetic energy, and the falling time.

[0021] Preferably, in step S3, the relative wind kinetic energy of the asphalt... Where ρ a

[0022] Given the air density and the small distance between the nozzle and the ground, the gravitational potential energy is negligible compared to the kinetic energy. Therefore, the asphalt stability energy equals the kinetic energy, i.e., stability energy = kinetic energy. The energy ratio of the stable energy of the asphalt to the relative wind kinetic energy is:

[0023] Preferably, in step S3, the jet stiffness S depends on the coupling relationship between inertial force and viscous force, i.e., the Reynolds number. Therefore, jet stiffness k2 is an empirical constant for jet stiffness correction.

[0024] The beneficial effects of this invention are as follows:

[0025] This invention discloses an asphalt spraying system and its spraying volume control method. The asphalt spraying system can effectively ensure the uniformity of asphalt spraying and precisely control the spraying volume per square meter by adjusting the pressure, achieving the preset sealing layer thickness and uniformity requirements. This avoids the uneven asphalt spraying that affects construction quality in traditional sealing layer spraying processes. The spraying volume control method of this asphalt spraying system is based on the initial spraying angle of the nozzle, combined with factors such as the flow enhancement factor, polymerization critical velocity, kinetic energy transfer angle, and the influence of the sealing vehicle's movement on the asphalt spraying width during the asphalt spraying process. It effectively calculates the spraying width of a trapezoidal nozzle with a height, upper bottom edge width, lower bottom edge width, and nozzle outlet thickness. This allows construction personnel to adjust the nozzle height and spraying pressure in a timely manner according to actual construction needs, ensuring the uniformity of asphalt spraying and precisely controlling the spraying volume per square meter. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of the asphalt nozzle of the asphalt spraying system of the present invention;

[0027] Figure 2 This is a schematic diagram of asphalt spraying from a single nozzle of the asphalt spraying system of the present invention;

[0028] Figure 3 This is a schematic diagram of the lateral arrangement of nozzles in the asphalt spraying system of the present invention;

[0029] Figure 4 This is a schematic diagram showing the nozzles arranged at intervals in the longitudinal direction of the asphalt spraying system of the present invention;

[0030] Figure 5 These are photos of the on-site implementation of the asphalt spraying system and its spraying volume control method of the present invention during the sealing layer construction. Detailed Implementation

[0031] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0032] Numerous specific details are set forth in the following description to enable those skilled in the art to fully understand the invention. However, the invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0033] In the description of the embodiments of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0035] like Figures 1-4 As shown, a flexible crack-resistant asphalt spraying system is used to uniformly spray asphalt. The flexible crack-resistant asphalt spraying system includes: multiple nozzles, the width of the asphalt sprayed by each nozzle is L, the nozzles are alternately arranged in the longitudinal direction to form at least two rows of nozzle valve groups to eliminate the unevenness of the nozzle spraying, the nozzles are uniformly spaced in the transverse direction, and the spacing between adjacent nozzles in the transverse direction of the nozzle valve group is a fraction of the width of the asphalt distribution of a single nozzle.

[0036] A method for controlling the spraying rate of an asphalt spraying system, wherein the asphalt spraying system is manufactured based on the method for controlling the spraying rate of an asphalt spraying system, the method for controlling the spraying rate includes:

[0037] S1. Nozzle setup: The nozzles are alternately arranged in the longitudinal direction and the distance between adjacent nozzles in the longitudinal direction is S. The nozzles are evenly spaced in the transverse direction and the distance between adjacent nozzles in the transverse direction of the nozzle valve group is L / 2. The nozzles include trapezoidal nozzles with height h, upper bottom width a, lower bottom width b, and nozzle outlet thickness W.

[0038] The spray angle of the nozzle is... V h L represents the speed of the sealing vehicle during sealing layer construction, L represents the width of the asphalt coverage area spread by a single nozzle, and m represents the amount of asphalt used per unit area.

[0039] S2. Distribution width of asphalt sprayed from the nozzle: Calculate the initial spray angle of the trapezoidal nozzle based on its dimensions. And based on the flow enhancement factor η and the critical polymerization rate V c and the angle of kinetic energy transfer θ d Calculate the diffusion angle θ of asphalt after it leaves the nozzle, considering the effect of the gradual expansion of the asphalt path cross-section during asphalt spraying. t The flow enhancement factor is used to correct the effect of turbulence caused by high Reynolds number on the flow. It is usually used to describe the additional enhancement effect of fluid flow properties in turbulent state compared with laminar state.

[0040] The selection of the flow enhancement factor η includes the following steps:

[0041] S201. Calculation of Hydraulic Diameter: The hydraulic diameter is used to describe the flow characteristics of fluids in pipes and channels. The hydraulic diameter of the asphalt within the nozzle is... Where A is the cross-sectional area of ​​the water passage, P is the wetted perimeter, i.e., the total perimeter of the fluid in contact with the wall; and m is the slope coefficient.

[0042] S202. Selection of Reynolds Number: The Reynolds number reflects the ratio of inertial force to viscous force in a fluid. Where ρ is the density of asphalt, and V j For asphalt flow velocity and In the formula, Q is the flow rate, A is the nozzle outlet area, W is the nozzle outlet thickness, and μ is the asphalt viscosity. P is the jet pressure, C d The flow coefficient is used to determine the flow rate. Therefore, in actual construction, construction workers can precisely adjust the flow rate and velocity of asphalt by adjusting the pressure, so as to intelligently match the speed of the sealing vehicle (i.e., intelligently adjust the spraying pressure according to the speed of the sealing vehicle, thereby adjusting the flow rate and spraying speed).

[0043] S203, Flow enhancement factor η: Where C and n are constants that need to be determined through experiments or data fitting, where C represents the overall drag effect, and the constant n represents the flow characteristics, R e0 To enhance the initial Reynolds number critical point, R was experimentally calibrated. e0 When determined experimentally, for a trapezoidal channel and with asphalt as the fluid, C = 1.0, n = 0.75, and R... e0 =1800.

[0044] The constant 'n' in the formula represents the flow characteristics, indicating the sensitivity of flow enhancement to changes in the Reynolds number, and is mainly related to the rheological behavior of the fluid. For Newtonian fluids (such as water), n is typically 1 (in a linear correspondence); while for non-Newtonian fluids (such as asphalt), n < 1 (e.g., n = 0.75): characterizing the shear thinning effect (i.e., the viscosity of the fluid decreases under shear), commonly seen in polymer melts or dense suspensions; while n > 1: characterizing the shear thickening effect (i.e., the viscosity of the fluid increases at high speeds), such as in starch solutions.

[0045] The critical rate of polymerization Where V c σ is the critical velocity, and σ is the surface tension, which reflects the attractive force between fluid molecules.

[0046] Kinetic energy transfer angle Where θ d The momentum transfer angle represents the degree of diffusion of the fluid under momentum.

[0047] In the formula, the constant γ reflects the fundamental relationship between momentum transfer and Reynolds number. It represents the influence of Reynolds number on momentum transfer at higher flow velocities, while the constant ε indicates the influence of changes in Reynolds number on the momentum transfer angle. It typically represents the nonlinear relationship between momentum transfer and Reynolds number after the flow reaches a certain level of turbulence. γ and ε can be fitted using experimental data; for asphalt, γ = 0.06 and ε = 0.1 can be taken.

[0048] In this embodiment, when the asphalt flow velocity V j Greater than the critical velocity V c At that time, the kinetic energy is transferred at the angle θ d With Reynolds number R e The correlation expresses the law of momentum transfer and diffusion as the flow velocity increases. When the asphalt flow velocity V j Less than or equal to the critical velocity V c At this point, the momentum transfer angle is 0, indicating no significant momentum diffusion. Therefore, the total diffusion angle is...

[0049]

[0050] S3, Horizontal motion enhancement factor of asphalt under horizontal motion state: When the nozzle on the sealing truck moves at a V... h When moving at a horizontal velocity, the asphalt diffuses to both sides under the influence of the horizontal velocity. Based on the diffusion increment coefficient φ and the influence of jet stiffness on the asphalt, the horizontal motion enhancement factor of asphalt under the influence of horizontal velocity can be obtained as β=1+φS.

[0051] In this embodiment, when the nozzles on the sealing vehicle move at V... h When moving at a horizontal speed, the time t from when the asphalt is sprayed from the nozzle to when it hits the ground is: Because the sealing vehicle is traveling horizontally, considering that the nozzle is moving at a V-shape... h The influence of external wind on asphalt spraying during horizontal movement requires further determination of the diffusion increment coefficient φ based on the time from asphalt ejection from the nozzle to its landing point. This diffusion increment coefficient φ is proportional to the energy ratio R. E The product of the falling time is but By setting the k1 asphalt diffusion correction coefficient, the diffusion increment coefficient φ is made equal to the product of the energy ratio of the asphalt's stable energy and relative wind kinetic energy and the falling time. Thus, the diffusion increment coefficient φ after the asphalt is sprayed from the nozzle during the movement of the sealing vehicle can be calculated. The k1 asphalt diffusion correction coefficient can be taken as 12.5 if there is no relevant test.

[0052] In step S3, the jet stiffness S depends on the ratio of inertial force to viscous force, i.e., the Reynolds number. Therefore, jet stiffness k2 is an empirical constant for jet stiffness correction. It characterizes the coupling effect of inertial and viscous forces during jet flow and is used to correct the influence of jet morphology (such as turbulent fluctuations and boundary layer separation) on the macroscopic stiffness S. It is determined experimentally; for asphalt, if no relevant experiments are available, a value of k2 = 0.050 can be used. In summary, the horizontal motion enhancement factor is:

[0053]

[0054] S4. Width of the asphalt sprayed from the nozzle onto the ground: Based on steps S1, S2, and S3, the width of the asphalt sprayed from a single nozzle onto the ground.

[0055]

[0056] In this embodiment, the asphalt spraying system can effectively ensure the uniformity of asphalt spraying and precisely control the spraying amount per square meter by adjusting the pressure, achieving the preset sealing layer thickness and uniformity requirements. This avoids the uneven asphalt spraying that affects construction quality in traditional sealing layer spraying processes. The spraying amount control method of this asphalt spraying system is based on the initial spraying angle of the nozzle, combined with factors such as the flow enhancement factor, polymerization critical velocity, kinetic energy transfer angle, and the influence of the sealing vehicle's movement on the asphalt spraying width during the asphalt spraying process. It effectively calculates the spraying width of a trapezoidal nozzle with height h, upper bottom width a, lower bottom width b, and nozzle outlet thickness W. This allows construction personnel to adjust the nozzle height and spraying pressure in a timely manner according to actual construction needs, ensuring the uniformity of asphalt spraying and precisely controlling the spraying amount per square meter.

[0057] In a preferred embodiment, in step S3, the relative wind kinetic energy of the asphalt... Where ρ a The density is air. The stability energy of asphalt is the sum of its kinetic energy and gravitational potential energy. However, since the distance between the nozzle of the sealing vehicle and the ground is usually small and the gravitational potential energy scale factor p1 is around 0.1, E g Relative to E j The magnitude is negligible, therefore the asphalt stabilization energy equals the kinetic energy, that is, the stabilization energy equals the kinetic energy. The energy ratio of the stability energy of asphalt to the relative wind kinetic energy:

[0058] Furthermore, the present invention also provides a specific calculation and control process for a trapezoidal nozzle with a nozzle height h = 2.2 cm, an upper width a = 2 cm, and a lower width b = 4 cm: the calculation of the asphalt spraying distribution width of a single nozzle includes:

[0059] Distribution width of asphalt sprayed from the nozzle: Geometric diffusion angle (initial spray angle): If the asphalt spray nozzle is set to a trapezoidal shape, with nozzle height h = 2.2cm, upper width a = 2cm, and lower width b = 4cm, then the spray angle is...

[0060] S2, the width of the asphalt sprayed from the nozzle:

[0061] Selection of the flow enhancement factor η: The flow enhancement factor is used to correct the effect of turbulence caused by high Reynolds numbers on the flow. It is usually used to describe the additional enhancement effect of fluid flow properties under turbulent conditions compared to laminar conditions.

[0062] S201, Calculation of hydraulic diameter:

[0063] S202. Selection of Reynolds Number: Reynolds Number Where ρ is the density of asphalt (1020 kg / m³) 3 Asphalt V j Take 2 m / s and the asphalt viscosity μ as 0.3 Pa·s.

[0064] S203, Calculation of flow enhancement factor η:

[0065] Polymerization critical rate The surface tension σ is 0.035 N / m, and the empirical correction factor λ is 1.2.

[0066] Calculation of the angle of kinetic energy transfer: due to V j =2m / s>V c =0.045m / s; therefore

[0067] Among them, γ=0.06 and ε=0.1.

[0068] In summary, in this embodiment, the diffusion angle θ of the asphalt after it leaves the nozzle is... t =θ+ηθ d =0.427+0.154×0.521=0.507(rad).

[0069] S3, Horizontal motion enhancement factor of asphalt under horizontal motion state:

[0070] 1) Time from asphalt spraying to landing Nozzle height H = 0.41m (nozzle height adjustment of the sealing vehicle).

[0071] 2) Diffusion increment coefficient Vehicle speed V h It is 3 m / s.

[0072] 3) Correction of jet stiffness effect In summary, the horizontal motion enhancement factor β = 1 + φS = 1 + 0.005 × 1.965 = 1.010.

[0073] S4. Width of asphalt sprayed from the nozzle to the ground: Width of asphalt sprayed from a single nozzle L = b + Htan(θ) t )β=0.04+0.022×tan(0.507)×1.01=0.50m.

[0074] Therefore, based on the above calculations, the lateral spacing of the nozzles... The nozzle spacing during on-site construction is 0.25m; the thickness of the nozzle along the direction of travel of the sealing vehicle is... On-site construction: Asphalt usage is 1.6 kg / m³. 2 Because the seal layer in this embodiment uses a "sandwich" structure of asphalt + fiber + asphalt, with the upper and lower asphalt layers being spread separately, therefore...

[0075] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0076] The above embodiments merely illustrate several implementation methods of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A method for controlling the application rate of a flexible crack-resistant asphalt spraying system, wherein the flexible crack-resistant asphalt spraying system is used for uniformly spraying asphalt, characterized in that... The flexible crack-resistant asphalt spraying system includes multiple nozzles, each nozzle spraying asphalt with a width of [missing information]. The nozzles are alternately arranged in the longitudinal direction to form at least two rows of nozzle valve groups to avoid mutual interference between the nozzles spraying asphalt and to eliminate the unevenness of the asphalt. The nozzles are evenly spaced in the transverse direction, and the spacing between adjacent nozzles in the transverse direction of the nozzle valve group is a fraction of the asphalt distribution width of a single nozzle. The method for controlling the amount of spraying includes: S1. Nozzle arrangement: The nozzles are alternately arranged in the longitudinal direction, and the spacing between adjacent nozzles in the longitudinal direction is... The nozzles are evenly spaced laterally, and adjacent nozzles in the nozzle valve assembly are spaced a fraction of each other in the lateral direction. The nozzles include high... Top bottom width bottom edge width The nozzle outlet thickness is Trapezoidal nozzle; S2. Distribution width of asphalt sprayed by the nozzle: Calculate the initial spray angle of the trapezoidal nozzle based on its dimensions, and then apply the flow enhancement factor. Critical polymerization rate and the angle of kinetic energy transfer Calculate the diffusion angle of asphalt after it leaves the nozzle, considering the effect of the gradual expansion of the asphalt path cross-section during asphalt spraying. ; S3, Horizontal movement enhancement factor of asphalt under horizontal movement state: When the nozzle on the sealing vehicle is at... When moving at a horizontal velocity, the asphalt diffuses to both sides under the influence of the horizontal velocity, based on the diffusion increment coefficient. The horizontal motion enhancement factor of the asphalt under the influence of horizontal velocity can be obtained by considering the effect of jet stiffness on asphalt. ; S4. Width of the asphalt sprayed from the nozzle onto the ground: Based on steps S1, S2, and S3, the width of the asphalt sprayed from a single nozzle onto the ground. .

2. The method for controlling the spraying volume of an asphalt spraying system according to claim 1, characterized in that, In step S1, the spray angle of the nozzle is .

3. The method for controlling the spraying volume of an asphalt spraying system according to claim 2, characterized in that, In step S2, the flow enhancement factor The selection process includes the following steps: S201, Calculation of hydraulic diameter: The hydraulic diameter of the asphalt within the nozzle. ;in, The cross-sectional area of ​​the water passage. The wetted perimeter is the total circumference of the fluid in contact with the wall surface. Slope coefficient ; S202. Selection of Reynolds Number: The Reynolds number reflects the ratio of inertial force to viscous force in a fluid. ,in The density of asphalt, For asphalt flow velocity and In the formula Where A is the flow rate and A is the nozzle outlet area. For nozzle exit thickness, The viscosity of asphalt. , This refers to the injection pressure. For flow coefficient; S203, flow enhancement factor : ,in , These are constants that need to be determined through experiments or data fitting, where Represents the overall resistance effect. This represents the flow characteristics and indicates the sensitivity of flow enhancement to changes in Reynolds number. To enhance the critical point of the initial Reynolds number.

4. The method for controlling the spraying volume of an asphalt spraying system according to claim 3, characterized in that, In step S2, the critical polymerization rate ;in The critical velocity, Surface tension reflects the attractive forces between fluid molecules.

5. The method for controlling the spraying amount of the asphalt spraying system according to claim 4, characterized in that, In step S2, the angle of kinetic energy transfer ,in The momentum transfer angle represents the degree of diffusion of the fluid under momentum.

6. The method for controlling the spraying amount of an asphalt spraying system according to claim 5, characterized in that, In step S3, the time from when the asphalt is sprayed from the nozzle to when it hits the ground... calculate: → .

7. The method for controlling the spraying volume of an asphalt spraying system according to claim 6, characterized in that, Diffusion increment coefficient Proportional to energy ratio The product of the falling time is ,but ,in The asphalt diffusion correction factor is used to make the diffusion increment factor... It equals the product of the ratio of the stability energy of the asphalt to the relative wind kinetic energy and the falling time.

8. The method for controlling the spraying amount of an asphalt spraying system according to claim 7, characterized in that, In step S3, the relative wind kinetic energy of the asphalt ;in Given the air density and the small distance between the nozzle and the ground, the gravitational potential energy is negligible relative to kinetic energy. Therefore, the asphalt stabilization energy equals the kinetic energy, i.e., stabilization energy = kinetic energy. The energy ratio of the stability energy of the asphalt to the relative wind kinetic energy is: .

9. The method for controlling the spraying amount of an asphalt spraying system according to claim 8, characterized in that, In step S3, the jet stiffness S depends on the coupling effect of inertial forces and viscous forces, i.e., the Reynolds number. Therefore, jet stiffness , This is an empirical constant used to correct the jet stiffness.

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