JP2002021028A - Road utilities installed inside of tunnel and visual guidance system inside of tunnel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide road utilities capable of being installed inside of a tunnel improving a visual environment inside of the tunnel and greatly reducing the number of cleaning times as well as the simplification of cleaning for maintaining the visual environment. SOLUTION: The visual guidance system has a photocatalyst activated by ultraviolet rays and substance emitted by the ultraviolet rays, the substance emitted by irradiation of the ultraviolet rays is excited to improve the visual environment inside of the tunnel, the activated photocatalyst reveals oxidizing operation and hydrophilic operation, a contaminant is analyzed and, at the same time, the contaminant can be flushed out by only water washing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a road supplementary equipment installed in a tunnel which emits light by irradiating ultraviolet rays to enhance a gaze guidance effect and a visual environment, and has a photocatalytic effect.

[0002]

2. Description of the Related Art Numerous inventions have been proposed for providing photocatalysts activated by ultraviolet light to road-related facilities and the like to provide decomposability of contaminants by oxidizing action and easy detergency by developing hydrophilicity. is there. However, most of such inventions rely on ultraviolet energy from sunlight irradiation, and even if such road-related facilities with photocatalysts are installed inside tunnels where sunlight irradiation cannot be expected, the activity of photocatalysts can be reduced. Since the ultraviolet energy required for the conversion is not obtained, the above-mentioned effects due to the activity of the photocatalyst cannot be expected.

[0003]

Generally, road incidental equipment in a tunnel is inevitably reduced in the visual environment and the effect of gaze guidance by being contaminated with pollutants such as dust from the exhaust gas of passing vehicles. It is necessary to clean at regular intervals for recovery. Most of the pollutants are caused by the exhaust gas from passing vehicles and are often lipophilic.Cleaning requires a large amount of water and prolonged friction with tools such as brushes, and in some cases, the use of detergent. However, there are concerns about the labor and the negative effects on the environment.

Accordingly, the present invention enhances the visual line guiding effect and the visual environment in the tunnel by emitting light upon irradiation with ultraviolet rays, and has the oxidative decomposability of contaminants by a photocatalyst and the easy cleaning of contaminants by developing hydrophilicity. The purpose of the present invention is to provide ancillary equipment for roads in a tunnel.

[0005]

SUMMARY OF THE INVENTION The present invention is characterized in that a road-related facility having a photocatalyst activated by ultraviolet rays and a substance emitting light by ultraviolet rays is installed in a tunnel. Is what you do.

[0006] The photocatalyst-containing layer formed on the outer surface of the road auxiliary equipment in the tunnel is activated by ultraviolet rays, and the oxidizing action of the photocatalyst-containing layer decomposes pollutants such as dust from the exhaust gas of passing vehicles to purify the wall surface. In addition, the number of times of cleaning the road-related equipment in the tunnel required for maintaining the visual environment and the gaze guidance effect in the tunnel can be significantly reduced. In addition, a substance that emits light by ultraviolet rays contained in a site where the ultraviolet rays can reach is excited by the ultraviolet rays to emit light, thereby enhancing the visual environment and the visual line guidance effect in the tunnel.

The photocatalyst represented by titanium oxide in the present invention is a photocatalyst which is activated when exposed to ultraviolet rays contained in sunlight or artificial light to exhibit a strong oxidizing power. The substance used is Zn
O, SnO ₂ , SrTiO ₃ , WO ₃ , BiO ₃ , Fe
There are metal oxides O ₃ or the like. When titanium oxide is used, an anatase-type crystal having high activity is preferable, but rutile-type fine particles can also be used.

[0008] The road supplementary equipment in the tunnel is not particularly limited as long as it can be installed in the tunnel and can be seen by the driver.
It is a pillar-shaped sign, a sign board, a road marking material and the like.

[0009] A gaze guidance system in a tunnel may be provided, in which an ultraviolet irradiation device for irradiating a light beam including an ultraviolet ray is provided to the road-related equipment installed in the tunnel.

Activating the photocatalytic function by disposing an ultraviolet irradiation device has a limited effect on the cost and maintenance cost of the device if it is installed for the purpose of decomposing pollutants and developing hydrophilicity. However, in this case, it is possible to use ultraviolet light efficiently by also serving as light emission.

Furthermore, if a substance that emits light by ultraviolet light is excited by ultraviolet light to emit light, a high-intensity excitation light can be obtained, which can assist the illumination in the tunnel. In this case, the power of the illumination in the tunnel is saved. It is also possible.

The ultraviolet irradiation device is not particularly limited as long as it can irradiate a light beam containing ultraviolet light. However, it is preferable that the ultraviolet irradiation device irradiate light having a large wavelength of 380 nm or less at which the activity of the photocatalyst and the luminance of the ultraviolet excitation light increase. What you can do is good. However, ultraviolet rays of 315 nm or less (UV-B, UV
-C) is harmful to the human body and is specified in harmful ultraviolet rays and JIS. Therefore, those capable of irradiating near-ultraviolet radiation (UV-A; English name black light) of 320 nm to 400 nm are suitable. A lamp mainly containing the wavelength may be used, or a lamp containing a large amount of the wavelength and including visible light may also serve as illumination in the tunnel. The ultraviolet irradiation device may continuously irradiate the ultraviolet light, or may irradiate the ultraviolet light intermittently in consideration of the above-mentioned effect and energy efficiency by the photocatalyst.

Even when the performance of decomposing contaminants by the oxidizing action of the photocatalyst does not reach the degree of adhesion of the contaminants, the surface is rendered hydrophilic by the expression of hydrophilicity, which is the characteristic of the photocatalyst. Can be easily removed without using a brush, a detergent, or the like only by washing with water, so that labor and cost for cleaning can be saved, and adverse effects on the environment can be reduced.

The substance which emits light by ultraviolet light is not particularly limited as long as it emits visible light when excited by light in a wavelength region including ultraviolet light. Light bodies are preferred,
Either one or two may be used simultaneously. In addition, either an organic type or an inorganic type may be used, and two types may be used at the same time.

If the outer surface of the road-related equipment in the tunnel is too smooth, it is not preferable because it reflects the light of the oncoming vehicle.
Therefore, it is preferable to prevent reflection by mixing a material having a retroreflective property such as glass beads, or by providing irregularities on the outer surface such that the irregularities can be recognized by touch. In the conventional cleaning with a brush, there is a possibility that the irregularities may be worn out. However, in the present invention, such an adverse effect can be avoided because only water is used. Further, by providing unevenness on the outer surface, the illumination of the vehicle can be efficiently used as diffused light.

In addition, although the photocatalyst has a NOx removal performance, since a high concentration of NOx exists in the tunnel, the photocatalyst is more efficient in the tunnel than removing NOx from the exhaust gas discharged outside the tunnel. Capture becomes possible, and NOx released outside the tunnel can be reduced. NOx
When NOx is accumulated on the surface as nitric acid, the NOx removal performance decreases, but the NOx removal performance can be restored by washing away the nitric acid by the water washing. Furthermore,
Increasing the surface area by providing the above-described unevenness on the outer surface also leads to an increase in the NOx adsorption efficiency.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION
A description will be given based on FIGS.

Referring to FIG. 1, a tunnel interior plate 11 is provided on the inner wall of the tunnel 1 as an accessory to the road in the tunnel, and a columnar marker 12 is provided on the center line. Is arranged. The ultraviolet irradiation device and the illumination 13 in the tunnel irradiate the tunnel interior plate 11 with a light beam containing ultraviolet light, thereby exciting a substance that emits light by ultraviolet rays contained in the surface layer of the tunnel interior plate 11 to emit visible light, The visual environment is improved by brightening the inner surface, and the photocatalyst contained therein expresses an oxidizing action by ultraviolet rays to decompose dirt, and at the same time, the surface is made hydrophilic and dirt is easily removed. Furthermore, since the photocatalyst adsorbs NOx in the tunnel,
NOx released outside the tunnel can be reduced.

FIG. 2 shows details of the columnar marker 12 installed in the tunnel 1 shown in FIG. 1. Reflector sheets 12a are wound around three columns of the columnar marker 12 and adhered. ing. A substance that emits light by ultraviolet rays contained in the surface layer of the columnar marker is excited to emit visible light, and the columnar marker 12 is raised brightly so that the driver can clearly recognize the lane division. Similarly to the tunnel interior plate, the contained photocatalyst expresses an oxidizing action by ultraviolet rays to decompose dirt, and at the same time the surface is made hydrophilic, and the dirt can be easily removed only by washing with water.

[0020]

According to the present invention, the photocatalyst-containing layer formed on the outer surface of the road auxiliary equipment in the tunnel is activated by ultraviolet rays, and the oxidation action of the photocatalyst-containing layer decomposes pollutants such as dust from the exhaust gas of passing vehicles to purify the wall surface. Thus, the number of times of cleaning of the road-related facilities in the tunnel required for maintaining the visual environment and the gaze guidance effect in the tunnel can be significantly reduced. In addition, a substance that emits light by ultraviolet rays contained in a site where the ultraviolet rays can reach is excited by the ultraviolet rays to emit light, thereby enhancing the visual environment and the visual line guidance effect in the tunnel.

[0021]

[Brief description of the drawings]

FIG. 1 is a diagram inside a tunnel showing an example of the present invention.

FIG. 2 is a view showing details of a pillar-shaped sign as a road accessory in the tunnel shown in FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tunnel 11 Tunnel interior board 12 Column-shaped marker 12a Reflection sheet 13 Ultraviolet irradiation device and illumination in tunnel

Claims (3)

[Claims] 1. A photocatalyst activated by ultraviolet light,
Road-related equipment installed in a tunnel, characterized by having a substance emitting light by ultraviolet rays. 2. A road auxiliary equipment installed in a tunnel according to claim 1, wherein a surface having a retroreflective property and / or unevenness to the extent that it can be recognized by a finger is added to the surface. 3. A tunnel interior gaze, wherein the road incidental equipment according to claim 1 or 2 is installed in a tunnel, and the road incidental equipment is provided with an ultraviolet irradiation device for irradiating a light beam containing ultraviolet light. Guidance system.