Dispersion method

Abstract

To provide a spraying apparatus which uniformly forms a tack coat which is an adhesion layer having good adhesiveness with aggregate (sand, gravel, etc.) on the road surface.SOLUTION: A spraying apparatus for spraying a solution for asphalt pavement on the road surface comprises asphalt emulsion spraying means for spraying asphalt emulsion, decomposing agent spraying means for spraying a decomposing agent for decomposing the asphalt emulsion, and mixing means for mixing the asphalt emulsion and the decomposing agent sprayed on the road surface.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a spraying device and a spraying method for spraying an asphalt emulsion used in asphalt paving work and a decomposing agent for decomposing the asphalt emulsion. [Background technology]

[0002] Asphalt pavement is a multi-layer structure consisting of a roadbed, roadbed, base layer, and surface layer, and the adhesion between these layers contributes greatly to the distribution of the load of passing vehicles. In particular, the adhesive strength between the surface layer and base layer is closely related to the lifespan of the pavement, so it is common to provide a tack coat, which is an adhesive layer, between these layers.

[0003] Tack coats are formed by spraying heated asphalt directly, by spraying cutback asphalt dissolved and diluted with a volatile solvent, or by spraying an emulsion of asphalt dissolved in water using a surfactant, etc. Among these, asphalt emulsions are used as the mainstream material for tack coats because they are highly safe and have a low environmental impact.

[0004] A fast-dissolving tack coat is a type of tack coat that uses asphalt emulsion and is intended to shorten application time. This type of tack coat is created by spraying a metal salt solution or other decomposing agent immediately after spraying the asphalt emulsion to chemically decompose the asphalt emulsion and form a tack coat.

[0005] However, when using a fast-dissolving tack coat, depending on the situation, a long waiting period is required, resulting in a problem of extended construction time. This is because asphalt emulsion accumulates in depressions in the road surface being constructed. If a decomposing agent is sprayed on a depression where asphalt emulsion has accumulated, only the surface of the asphalt emulsion is decomposed, and the interior of the asphalt emulsion remains intact for a long time. Therefore, if depressions exist on the road surface being constructed, it is necessary to wait until the interior of the asphalt emulsion is decomposed. Furthermore, if the next process of spreading the heated mixture and the accompanying compaction are performed before the asphalt emulsion has decomposed, the moisture in the asphalt emulsion will expand, causing blistering of the pavement and peeling between the layers.

[0006] Therefore, a roadway construction machine described in Patent Document 1 is known as a device that solves this problem. The roadway construction machine described in Patent Document 1 describes spraying an asphalt emulsion and a decomposing agent onto brushes. Specifically, the method describes spraying the asphalt emulsion into the brushes, and then spraying the decomposing agent onto the lower part of the brushes. In other words, the asphalt emulsion and the decomposing agent are mixed before being sprayed onto the road surface. By spraying the asphalt emulsion and the decomposing agent in this manner, the asphalt emulsion can be more reliably decomposed. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Publication No. 9-21102 Summary of the Invention [Problem to be solved by the invention]

[0008] However, with this method, the asphalt emulsion is brought into contact with the decomposer before it reaches the road surface, and the asphalt emulsion, which has already begun to decompose, comes into contact with the aggregates (sand, gravel, etc.) on the road surface, resulting in significantly poor adhesion to the aggregates (sand, gravel, etc.). Furthermore, the asphalt emulsion gradually decomposes and hardens on the brush, clogging the brush, which creates the problem of making it impossible to spread the asphalt emulsion evenly.

[0009] Therefore, the present invention has been made in consideration of the above-mentioned problems, and one of the objects of the present invention is to provide a spraying device that uniformly forms a tack coat that has good adhesion to aggregates (sand, gravel, etc.) on the road surface. [Means for solving the problem]

[0010] In order to achieve the above object, the present invention has at least the following configuration or executes the following procedures. Note that in the following description, reference numerals and the like shown in the drawings may be used to facilitate understanding of the present invention, but the components of the present invention are not limited to those shown in the drawings and should be interpreted broadly to the extent that those skilled in the art can technically understand them.

[0011] A spraying device according to one aspect of the present invention is a spraying device that sprays a solution for asphalt paving onto a road surface, and is characterized by comprising an asphalt emulsion spraying means that sprays asphalt emulsion, a decomposing agent spraying means that sprays a decomposing agent to decompose the asphalt emulsion, and a mixing means that mixes the asphalt emulsion and the decomposing agent that have been sprayed onto the road surface. This configuration makes it possible to uniformly form a tack coat that has good adhesion to aggregates (sand, gravel, etc.) on the road surface.

[0012] Preferably, the mixing means is a brush, and the brush comes into contact with the asphalt emulsion and decomposing agent spread on the road surface to mix them. With this configuration, the asphalt emulsion and the decomposing agent that have been spread on the road surface can be mixed more reliably.

[0013] Preferably, the mixing means is an air jet, and the air jet mixes the asphalt emulsion and decomposing agent spread on the road surface by jetting air thereto. With this configuration, the asphalt emulsion and the decomposing agent that have been spread on the road surface can be mixed more reliably.

[0014] Preferably, the vehicle is characterized by being provided with wheels as a means of transportation. With this configuration, the asphalt emulsion and decomposing agent can be sprayed while moving.

[0015] Preferably, the present invention is characterized by including a scattering prevention material for preventing scattering of the asphalt emulsion and decomposing agent. This configuration makes it possible to prevent the asphalt emulsion and decomposing agent from scattering.

[0016] Preferably, the mixing means is provided outside the shatterproof material. This configuration can prevent the asphalt emulsion and decomposer from adhering to the brush or air jet that is the mixing means.

[0017] Preferably, the material of the bristles of the brush is made of natural materials from animals and plants, metal, plastic, or rubber, and the bristles have a diameter of 0.2 mm to 5 mm. With this configuration, the asphalt emulsion and the decomposing agent that have been spread on the road surface can be mixed more reliably.

[0018] Preferably, the brush is movable up and down and left and right. With this configuration, the brush can be positioned in an appropriate position, so that the asphalt emulsion and decomposing agent sprayed on the road surface can be mixed more reliably.

[0019] Furthermore, a spraying method according to one aspect of the present invention is a method for spraying a solution for asphalt paving onto a road surface, and is characterized by including an asphalt emulsion spraying step of spraying an asphalt emulsion onto the road surface, a decomposing agent spraying step of spraying a decomposing agent onto the road surface onto which the asphalt emulsion has been sprayed, and a mixing step of mixing the asphalt emulsion and the decomposing agent onto the road surface onto which the asphalt emulsion and the decomposing agent have been sprayed. This configuration makes it possible to form a tack coat that has good adhesion to aggregates (sand, gravel, etc.) on the road surface.

[0020] Preferably, the amount of the asphalt emulsion to be sprayed is 0.4 L / m 2 ~1.5L / m 2 It is characterized in that: This configuration makes it possible to form a tack coat that has better adhesion to aggregates (sand, gravel, etc.) on the road surface. [Effects of the Invention]

[0021] As described above, according to the present invention, it is possible to form a tack coat, which is an adhesive layer that has good adhesion to aggregates (sand, gravel, etc.) on the road surface. [Brief explanation of the drawings]

[0022] [Figure 1] 1 is a diagram showing a spraying device 100 according to one embodiment of the present invention. [Figure 2] 10 is a flowchart showing the flow of a spraying method S200 using the spraying device 100 according to one embodiment of the present invention. [Figure 3] FIG. 1 is a diagram showing how a tack coat is formed when there is a depression 11 on a road surface 10. DETAILED DESCRIPTION OF THE INVENTION

[0023] Hereinafter, each embodiment of the present invention will be specifically described with reference to the drawings. Note that the embodiment described below is merely a specific example for carrying out the present invention, and is not intended to limit the present invention.

[0024] FIG. 1 is a diagram showing a spraying device 100 according to one embodiment of the present invention. The spraying device 100 sprays an asphalt paving solution onto a road surface 10, and includes asphalt emulsion spraying means 110 for spraying asphalt emulsion 111, decomposing agent spraying means 120 for spraying a decomposing agent 121 for decomposing the asphalt emulsion 111, and mixing means 130 for mixing the asphalt emulsion 111 and the decomposing agent 121 sprayed onto the road surface 10. The spraying device 100 also includes moving means 140 for movement and a scattering prevention material 150 for preventing the asphalt emulsion 111 and the decomposing agent 121 from scattering. The spraying device 100 also includes a compressor 160 for delivering the asphalt emulsion 111 and the decomposing agent 121.

[0025] The asphalt emulsion spraying means 110 uses a compressor 160 to send out the asphalt emulsion 111 from the asphalt emulsion tank 112 and spray the asphalt emulsion 111. Note that a cationic asphalt emulsion 111 is used as the asphalt emulsion 111. Specifically, the asphalt emulsion spraying means 110 is an asphalt emulsion spraying nozzle.

[0026] The decomposing agent spraying means 120 uses a compressor 160 to send out the decomposing agent 121 from a decomposing agent tank 122 and spray the decomposing agent 121. The decomposing agent spraying means 120 is located behind the asphalt emulsion spraying means 110. The direction in which the spraying device 100 moves while spraying the asphalt paving solution is the forward direction, and the direction opposite to the direction in which the spraying device 100 moves is the rearward direction. Specifically, the decomposing agent spraying means 120 is a dispersant spraying nozzle.

[0027] The mixing means 130 mixes the sprayed asphalt emulsion 111 and decomposing agent 121. The mixing means 130 is a brush or an air jet.

[0028] When the mixing means 130 is a brush, the brush comes into contact with the sprayed asphalt emulsion 111 and decomposing agent 121, thereby mixing the asphalt emulsion 111 and the decomposing agent 121. The materials used for the bristles of the brush are preferably natural materials from animals and plants, metal, plastic, or rubber. Particularly preferred are polybutylene terephthalate (PBT), polypropylene (PP), nylon (NY), etc., due to their physical properties and economical efficiency. The bristles of the brush preferably have a wire diameter of 0.2 mm to 5 mm. If the bristles have a wire diameter smaller than 0.2 mm, the bristles are too soft, while if they are 5 mm or larger, they are too hard and do not enter the recessed portion 11 described below. The length of the bristles of the brush is approximately 3 cm to 10 cm. This length allows the brush to enter the recessed portion 11 described below. The brush is also attached so that it can move up, down, left, and right. Being attached so that it can move up, down, left, and right allows the brush to be moved to the appropriate position. This allows for more reliable mixing of the sprayed asphalt emulsion 111 and the decomposing agent 121. When the mixing means 130 is not needed, the brush is raised to prevent contact with the road surface 10. This reduces wear on the brush.

[0029] It is preferable to use brushes arranged in a row, but it is also possible to use brushes that are divided like piano keys and can move up and down independently.

[0030] When the mixing means 130 is an air jet, the asphalt emulsion 111 and the decomposing agent 121 are mixed by jetting air onto the sprayed asphalt emulsion 111 and the decomposing agent 121. When an air jet is used, there is no physical contact, so contamination can be prevented. When an air jet is used, one with sufficient jet pressure is used. Furthermore, the jet is sprayed vertically, that is, toward the road surface 10, but the jet pressure and jet direction can be fine-tuned to prevent the mixture from scattering when sprayed.

[0031] The moving means 140 moves the spraying device 100. Specifically, wheels are used to move the spraying device 100. By using wheels, the spraying device 100 can be moved while spraying, improving the efficiency of spraying. Furthermore, even if the weight of the spraying device 100 increases, it can be easily moved.

[0032] The scattering prevention material 150 prevents scattering of the asphalt emulsion 111 and the decomposing agent 121. Note that the scattering prevention material 150 is made of sagging rubber.

[0033] The scattering prevention material 150 is attached rearward of the asphalt emulsion spraying means 110 and the decomposing agent spraying means 120. The mixing means 130 is provided on the outside of the scattering prevention material 150. By providing the mixing means 130 on the outside of the scattering prevention material 150, splashes of water are prevented from reaching the mixing means 130. The "outside" here refers to the side of the scattering prevention material 150 opposite to the side on which the asphalt emulsion spraying means 110 and the decomposing agent spraying means 120 are provided. While the mixing means 130 is attached to the scattering prevention material 150 in FIG. 1, this is not limiting, and the mixing means 130 may be attached by being fixed to a separate steel bar (not shown) that is independent of the scattering prevention material 150.

[0034] 2 is a flowchart showing the flow of a spraying method S200 using the spraying device 100 according to one embodiment of the present invention. The spraying method S200 includes an asphalt emulsion spraying step S210 of spraying an asphalt emulsion 111 onto a road surface 10, a decomposing agent spraying step S220 of spraying a decomposing agent 121 onto the road surface 10 onto which the asphalt emulsion 111 has been sprayed, and a mixing step S230 of mixing the asphalt emulsion 111 and the decomposing agent 121 on the road surface onto which the asphalt emulsion 111 and the decomposing agent 121 have been sprayed. The order of spraying is such that the asphalt emulsion 111 is sprayed, followed by spraying the decomposing agent 121, and then the asphalt emulsion 111 sprayed onto the road surface 10 and the decomposing agent 121 are mixed.

[0035] In the asphalt emulsion spraying step S210, asphalt emulsion 111 is sprayed by asphalt emulsion spraying means 110. The spray amount is 0.4 L / m 2 ~1.5L / m 2 Within this range, a tack coat with excellent adhesiveness can be obtained.

[0036] In the decomposing agent spraying step S220, the decomposing agent 121 is sprayed by the decomposing agent spraying means 120. The amount of the decomposing agent 121 sprayed is 10% to 20% of the amount of the asphalt emulsion 111 sprayed. Within this range, the asphalt emulsion 111 can be decomposed more reliably.

[0037] In the mixing step S230, the sprayed asphalt emulsion 111 and decomposing agent 121 are mixed. When the mixing means 130 is a brush, the contact angle of the brush with the road surface 10 is preferably ±45 degrees from the perpendicular to the road surface 10. If the contact angle is more inclined than this, the bristles or air cannot sufficiently penetrate into the depressions 11 described below, and the mixing effect is reduced.

[0038] 3 is a diagram showing how a tack coat is formed when there is a depression 11 on a road surface 10. As the spraying device 100 moves, it sprays asphalt emulsion 111 onto the road surface 10 and depression 11 using asphalt emulsion spraying means 110. Immediately afterwards, a decomposing agent 121 is sprayed onto the road surface 10 and depression 11 using decomposing agent spraying means 120 provided behind the asphalt emulsion spraying means 110. On flat road surfaces 10, the asphalt emulsion 111 and the decomposing agent 121 are mixed to a certain extent, but in depressions 11, the asphalt emulsion 111 has accumulated at the bottom and the decomposing agent 121 is sprayed on top of it. The mixture is then mixed using mixing means 130. Specifically, the brush that constitutes the mixing means 130 comes into contact with the depressions 11 in a scraping manner, thereby mixing the asphalt emulsion 111 and decomposing agent 121 that have accumulated in the depressions 11. This allows the asphalt emulsion 111 and decomposing agent 121 to harden quickly as a tack coat, which is a uniform adhesive layer. Furthermore, since the spraying device 100 according to the present invention sprays the asphalt emulsion 111 and decomposing agent 121 directly onto the road surface 10, they have good adhesion to aggregates (sand, gravel, etc.) on the road surface. Note that an air jet may also be used as the mixing means 130.

[0039] The above is a specific description of each embodiment of the present invention. The above description is merely a description of one embodiment, and the scope of the present invention is not limited to this one embodiment, but is to be broadly interpreted to the extent that a person skilled in the art can grasp it. [Industrial Applicability]

[0040] The present invention is useful in road construction and the like because it can uniformly form a tack coat, which is an adhesive layer that has good adhesion to aggregates (sand, gravel, etc.) on the road surface. [Explanation of symbols]

[0041] 10 Road surface 11 Recess 100 Spraying equipment 110 Asphalt emulsion spreading means 111 Asphalt emulsion 112 Asphalt emulsion tank 120 Decomposer dispersal means 121 Decomposer 122 Decomposer Tank 130 Mixing means 140 Transportation 150 Shatterproof material 160 Compressor S200 Spraying method S210 Asphalt emulsion spraying process S220 Dispersant spraying process S230 Mixing process

Claims

1. A method for spraying an asphalt paving solution onto a road surface using a spraying device, comprising: The spraying device is an asphalt emulsion spraying means for spraying the asphalt emulsion; a decomposing agent spraying means for spraying a decomposing agent for decomposing the asphalt emulsion; a mixing means for mixing the asphalt emulsion and the decomposing agent sprayed on the road surface; Wheels as a means of transportation, and a scattering prevention material for preventing scattering of the asphalt emulsion and the decomposition agent, The mixing means is a brush with bristles of 3 cm to 10 cm in length and 0.2 mm to 5 mm in diameter, which can move up and down and left and right, and which mixes the asphalt emulsion and decomposing agent by contacting them with the asphalt emulsion and decomposing agent that have been spread on the road surface, and is provided on the outside of the scattering prevention material; The spraying method includes: an asphalt emulsion spraying step of spraying asphalt emulsion onto the road surface and depressions by the asphalt emulsion spraying means; a decomposing agent spraying step in which the decomposing agent spraying means sprays a decomposing agent onto the road surface and depressions onto which the asphalt emulsion has been sprayed; a mixing step of mixing the asphalt emulsion and the decomposing agent on the road surface and in the depressions where the asphalt emulsion and the decomposing agent have been sprayed by the mixing means, The amount of the asphalt emulsion sprayed was 0.4 L / m ２ ~1.5 L / m ２ and The amount of the decomposing agent to be sprayed is 10% to 20% of the amount of the asphalt emulsion to be sprayed, In the mixing step, the brush is brought into contact with the road surface so that the contact angle between the brush and the road surface is ±45 degrees from the perpendicular to the road surface, and the asphalt emulsion and decomposing agent sprayed on the road surface are mixed together; A spraying method characterized in that in the mixing step, the brush comes into contact with the depressions in a scraping manner, thereby mixing the asphalt emulsion and decomposing agent that have accumulated in the depressions.

2. A method for spraying an asphalt paving solution onto a road surface using a spraying device, comprising: The spraying device is an asphalt emulsion spraying means for spraying the asphalt emulsion; a decomposing agent spraying means for spraying a decomposing agent for decomposing the asphalt emulsion; a mixing means for mixing the asphalt emulsion and the decomposing agent sprayed on the road surface; Wheels as a means of transportation, and a scattering prevention material for preventing scattering of the asphalt emulsion and the decomposition agent, The mixing means is an air jet that jets air into the asphalt emulsion and decomposing agent that have been spread on the road surface to mix them, and is provided outside the scattering prevention material; The spraying method includes: an asphalt emulsion spraying step of spraying asphalt emulsion onto the road surface and depressions by the asphalt emulsion spraying means; a decomposing agent spraying step in which the decomposing agent spraying means sprays a decomposing agent onto the road surface and depressions onto which the asphalt emulsion has been sprayed; a mixing step of mixing the asphalt emulsion and the decomposing agent on the road surface and in the depressions where the asphalt emulsion and the decomposing agent have been sprayed by the mixing means, The amount of the asphalt emulsion sprayed was 0.4 L / m ２ ~1.5 L / m ２ and The amount of the decomposing agent to be sprayed is 10% to 20% of the amount of the asphalt emulsion to be sprayed, In the mixing step, the air jetting device jets air perpendicularly to the road surface to mix the asphalt emulsion and the decomposing agent sprayed on the road surface, A spraying method characterized in that in the mixing step, the air jet ejects air into the depression, thereby mixing the asphalt emulsion and decomposing agent that have accumulated in the depression.

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