JP3740598B2 - How to clean contaminated air on the road - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for purifying contaminated air on a road.
[0002]
[Prior art]
Exhaust gas discharged from a vehicle contains a large amount of pollutants such as nitrogen oxides (NO _x ) and pollutes the atmosphere.
Today, when the protection of the global environment is screamed, such contaminated air should be purified as much as possible.
Conventionally, catalytic air purification devices are known.
[0003]
[Problems to be solved by the invention]
However, simply installing the above-described catalytic air purification device in a location where air pollution is severe causes problems in terms of space and aesthetics, and is difficult to realize.
On the other hand, roads occupy a very large surface area, such as roads where people pass and cars travel, and it is ideal if the surface of the roads can be used to purify contaminated air, especially because cars travel on roads. In view of preventing the diffusion of contaminated air, it is more preferable if the contaminated air can be purified on the roadway.
In recent years, titanium dioxide (TiO ₂ ), which undergoes a photocatalytic reaction by receiving light even at room temperature, has attracted attention. According to this titanium dioxide, it is known that a photocatalytic reaction is caused by receiving light, pollutants such as nitrogen oxides are changed and held by the photocatalytic reaction, and the held substances are removed by washing with water. ing.
The present invention has been devised by paying attention to the above-mentioned road and titanium dioxide, and the object of the present invention is to reduce the amount of polluted air on the road, which can purify the polluted air without losing space and detracting from aesthetics. It is to provide a purification method.
[0004]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides drainage pavement on a roadbed, projects innumerable small particle size aggregates from the surface of the drainage pavement to form countless irregularities on the surface, and the pavement surface, and titanium dioxide, follow this by fixed Ri by the solid Jozai titanium dioxide layer having a water permeability comprising a holding member which holds the titanium dioxide of the drainage pavement surface to the countless irregularities the irregularities covered by titanium dioxide layer formed, said purifies pollutants in the exhaust gas of a car by the photocatalytic reaction of titanium dioxide, and water spray on the surface of the covered with titanium dioxide layer road, titanium dioxide layer The pollutant retained in the water is washed away with water.
Further, the present invention is characterized in that the watering is periodically performed.
In the present invention, the titanium dioxide layer is formed by mixing titanium dioxide, cement, a filler, and water, and the mixture is sprayed on a road surface. The fixing material is composed of the cement.
In the present invention, the titanium dioxide layer is formed by mixing titanium dioxide and an inorganic paint, and the mixed inorganic paint is sprayed on or applied to a road surface. The holding material and the fixing material are composed of the paint.
Moreover, the present invention is characterized in that the road is a car-only road, and the watering is performed from a center portion in the width direction of the road toward both outer sides in the width direction of the road.
[0005]
In the present invention, when the titanium dioxide layer receives sunlight during the day, the titanium dioxide undergoes a photocatalytic reaction, and the contaminated air is purified by the photocatalytic reaction.
In addition, the contaminants retained in the titanium dioxide layer are washed away from the titanium dioxide layer by watering, and the titanium dioxide layer is again activated more actively.
And the surface of the road originally has a very large surface area. Therefore, by simply providing a titanium dioxide layer on the road surface, it is effective to purify contaminated air without causing problems in terms of space and aesthetics. Made.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment in which the present invention is applied to an elevated road that is a car-only road will be described.
FIG. 1 is a half sectional view of an elevated road, FIG. 2 is a plan view thereof, and FIG. 3 is a sectional view of a road portion.
Reference numeral 12 is an elevated road, 14 is a roadway, 16 is a median, 18 is a side wall, 20 is a pedestal, and the entire surface of the roadway 14 is covered with a titanium dioxide layer 20.
The roadway 14 is drained and has a noise reduction effect. That is, as shown in FIG. 3, a base layer 24 is provided on the roadbed 22, a surface layer 26 is provided on the base layer 24, the surface layer 26 has water permeability, and rainwater passes through the surface layer 26 during rainfall. It is configured to flow outward in the width direction of the roadway 14 along the base layer 24 and to be discharged out of the elevated road 12 through a water hole 1402 and a drain pipe 1404.
The surface layer 26 has innumerable small particle size aggregates 2602 protruding from the entire surface of the concrete layer 2604, and the particle size of the small particle size aggregates 2602 is about 4 to 8 mm at the maximum. Innumerable irregularities are formed.
[0007]
The median strip 16 is provided in the center of the elevated road 12 in the width direction and extends together with the roadway 14. The median strip 16 is configured as a planting area in the present embodiment, and water supply pipes 32 are installed on both sides of the median strip 16 in the longitudinal direction of the water feed pipe 32. Water spray nozzles 34 are attached to a number of places spaced apart from each other.
Water is supplied to the water supply pipe 32 by electric power obtained by the solar cell panel 36 attached to the side wall 18. That is, the pump is driven by the electric power obtained from the solar cell panel 36, and the water is supplied to the water supply pipe 32 by the driving of the pump. As shown in FIG. It is comprised so that water may be sprinkled toward.
In addition, the watering by the water supply pipe 32 and the watering nozzle 34 is for washing away the pollutant held on the titanium dioxide layer 20 as will be described later. For example, the watering is periodically performed for about 5 minutes once a day. Is done.
[0008]
The titanium dioxide layer 20 is made of titanium dioxide (TiO ₂ ) and a holding material for holding the titanium dioxide, and is provided on the surface of the surface layer 26 via a fixing material.
In the present embodiment, the titanium dioxide layer 20 is formed by thinly spraying a mixture of titanium dioxide, cement, a filler, and water over the entire surface of the surface layer 26. Therefore, the cement is used as a holding material. The titanium dioxide layer 20 has water permeability.
The filler is used to increase the volume, and sand is used in the embodiment. As the filler, glass particles, ceramic particles and the like can be used in addition to sand.
The mixing ratio of titanium dioxide, cement, and filler can be, for example, 1: 3: 2 by weight.
By spraying such a mixture thinly on the surface of the surface layer 26, the surface of the surface layer 26 is formed of irregularities following an infinite number of irregularities formed from an infinite number of small particle size aggregates 2602. Innumerable irregularities consisting of spray marks of the mixture are added.
In addition, adsorbents, such as activated carbon, are mixed in a mixture and it is arbitrary, such as improving the adsorption | suction effect | action of a contaminant.
[0009]
In the elevated road 12 having such a configuration, when the titanium dioxide layer 20 receives sunlight during the daytime, the titanium dioxide undergoes a photocatalytic reaction. Therefore, among pollutants in the polluted air, for example, nitric oxide or dioxide. Nitrogen oxides such as nitrogen are finally converted to nitric acid by the photocatalytic reaction and are retained on the titanium dioxide layer 20 as nitric acid, thereby purifying the contaminated air.
Contaminants such as nitric acid retained in the titanium dioxide layer 20 are washed away from the titanium dioxide layer 20 by periodic watering from the water supply pipe 32 and the watering nozzle 34 and removed. Thereby, in the titanium dioxide layer 20, the photocatalytic reaction is always maintained in a more active state. Needless to say, removal of contaminants from the titanium dioxide layer 20 is also removed by rain during rain.
[0010]
According to the present embodiment, by simply spraying the mixture of titanium dioxide on the surface of the existing drainage pavement, there is no problem in terms of space and aesthetics, and the drainage function and Without impairing the noise reduction function, the contaminated air is purified by the road surface before it is diffused.
And since the surface of the elevated road 12 originally has a vast surface area, purification of the polluted air by the titanium dioxide layer 20 is effectively performed.
Further, since contaminants such as nitric acid held in the titanium dioxide layer 20 are washed away and removed by regular watering from the water supply pipe 32 and the watering nozzle 34, the photocatalytic reaction is always more active in the titanium dioxide layer 20. Thus, the contaminated air can be purified more effectively.
Further, in the present embodiment, the titanium dioxide layer 20 is also formed in irregularities in order to spray a mixture of titanium dioxide on the surface of the surface layer 26 on which innumerable irregularities formed of the small particle size aggregate 2602 are formed. Since innumerable irregularities made of sprayed mixture are added to the irregularities, the area of the titanium dioxide layer 20 in contact with the atmosphere is greatly expanded, and the purification of contaminated air by the titanium dioxide layer 20 is made more effective.
Further, even if the titanium dioxide layer 20 is worn due to traveling of the vehicle, the surface of the surface layer 26 has innumerable irregularities made of countless small particle size aggregates 2602. The titanium dioxide layer 20 remains in the recess, which is advantageous in reducing wear of the titanium dioxide layer 20.
[0011]
The method for forming the titanium dioxide layer 20 on the road surface is arbitrary.
For example, titanium dioxide may be mixed with an inorganic paint, and the mixed liquid may be sprayed on or applied to the road surface. It corresponds to a material and a fixing material.
Alternatively, titanium dioxide may be mixed with a fibrous fluororesin and rolled into a sheet, and the sheet rolled into a sheet may be pressure-bonded to the road. It corresponds to a fixing material.
In the embodiments, the present invention is described when applied to an elevated road that is a car-only road. However, the road to which the present invention is applied is not limited to a roadway, and includes all sidewalks and passages. Roads are targeted, and the form of watering means can be changed as appropriate according to the environment of the road to be applied.
[0012]
【The invention's effect】
As is apparent from the above description, the present invention provides drainage pavement on the roadbed, innumerable small particle size aggregates protrude from the surface of the drainage pavement to form innumerable irregularities on the surface, on the surface of drainage pavement, and titanium dioxide, the myriad of irregularities of the surface of the drainage pavement and fixed Ri by the titanium dioxide layer to a solid Jozai having water permeability formed of the holding member for holding the titanium dioxide covered with titanium dioxide layer followed by the unevenness formed on the purify pollutants in the exhaust gas of a car by the photocatalytic reaction of titanium dioxide, and water spray on the surface of the covered with titanium dioxide layer road, titanium dioxide The pollutant retained on the layer is washed away with water.
Therefore, it is possible to purify the polluted air on the road without taking a place and without deteriorating the beauty.
[Brief description of the drawings]
FIG. 1 is a half sectional view of an elevated road.
FIG. 2 is a plan view of an elevated road.
FIG. 3 is a cross-sectional view of a road portion.
[Explanation of symbols]
12 Overpass 14 Roadway 16 Median Zone 20 Titanium Dioxide Layer 32 Water Supply Pipe 34 Watering Nozzle

Claims (5)

Apply drainage pavement on the roadbed,
By projecting countless small particle aggregates from the surface of the drainage pavement, forming countless irregularities on the surface,
Wherein the drainage pavement surface, and titanium dioxide, the holding member from the consisting by a titanium dioxide layer to a solid Jozai having permeability Ri fixed to the drainage pavement surface of the myriad of holding the titanium dioxide covered with titanium dioxide layer followed the irregularities are formed in an uneven,
Purifies pollutants in car exhaust by photocatalytic reaction of titanium dioxide,
Water was sprayed on the road surface covered with the titanium dioxide layer, and the contaminants retained on the titanium dioxide layer were washed away with water.
A method for purifying polluted air on a road characterized by the above. The watering method for purifying contaminated air on the road according to claim 1, characterized in that it is performed periodically. The titanium dioxide layer is formed by mixing titanium dioxide, cement, a filler, and water, and the mixture is sprayed on the road surface. The holding material and the fixing material are made of the cement. 3. The method for purifying polluted air on a road according to claim 1 or 2 , characterized in that it is configured. The titanium dioxide layer is composed of titanium dioxide mixed with an inorganic paint, and the mixed inorganic paint is sprayed on or applied to the road surface. The holding material and the fixing material 3. The method for purifying contaminated air on a road according to claim 1 or 2, wherein the paint is composed of the paint. The road is a car-only roads, the watering, as claimed any one to claims 1 to 4, characterized in that is carried out from the center in the width direction of the road towards the outer sides in the width direction of the road How to clean contaminated air on the road.

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