JP2001140227A - Road sign board restricting snow covering - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce traffic jam in winter season which are caused by degraded visibility due to sticking of snow to a display surface as a result of snow blowing onto the sign board. SOLUTION: A display surface 21 of an existing road sign board 2 is covered with a transparent covering body 3, the covering body 3 gives an angle of depression from the display surface 21 to the transparent surface 31 which are facing each other; when the display surface 21 is closed and attached to the peripheral edge of the sign board, snow falling from the above is received by a roof 33 of the covering body, snow blowing laterally does not create snow stagnation point on the surface of the transparent portion 31 because of a wind flow flowing and dropping from a hood portion 32 to the transparent portion 31; and therefore, snow covering to the surface of the transparent portion is restricted and the visibility of the display surface can be secured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a road sign board which obtains good visibility by attaching a transparent cover to an existing road sign board mainly installed in a snowy area to suppress snow accumulation. It is about.

[0002]

2. Description of the Related Art Heretofore, the applicant of the present invention has proposed a road sign board of this type in which snow accumulation is suppressed as described in Japanese Utility Model Publication No. 4-44650. This road sign board is provided with a snow protection board consisting of an inclined board and a deterrent board along the upper part of the front sign surface, and the inclined board is located at the upper end of the road sign board or the upper part of the sign board main body from the back side. It is designed to protrude in the shape of an eave toward the front surface so as to slide snowfall down to the back surface of the sign plate, and the deterrent plate extends substantially vertically upward from the protruding end of the inclined plate to sign. It was made so that the snow eaves could not be formed on the front of the board.

[0003] Further, the applicant has disclosed in Japanese Patent Application Laid-Open No. 9-310316.
No. 6,009,056, which is disclosed in Japanese Patent Application Laid-Open Publication No. H10-260, the disclosure of which is hereby incorporated by reference. That is, the sign surface of the sign board is inclined obliquely downward with respect to the vertical plane,
At the upper front side of the sign surface, an eave part whose inner surface is inclined at least obliquely downward with respect to the sign surface protrudes, so that strong wind snow blown from the front of the sign plate flows down and adheres to the sign plate surface. The structure is such that the snow on the eaves falls on the back of the signboard.

[0004]

The conventional road signboard as described above is provided with a snowboard made up of the inclined plate and the deterrent plate attached to a sign plate having a sign surface made substantially vertical, so that snow falling from above can be removed. By catching this, we try to avoid snow on the sign surface and prevent visibility from dropping, but snow does not always fall from above, and snowflakes lie sideways on the sign surface of the signboard body in strong winds etc. In such a case, the flow of wind is interrupted by the marking surface and the snow protection plate, and the flow of wind on the marking surface is stopped. As a result, the marking surface spreads over the entire surface and covers the marking surface, so that the sign content cannot be visually recognized.

[0005] In view of the above, it has been proposed that the sign surface is inclined forward with respect to the vertical surface, and an eave portion is provided above the sign surface. Snow falling from above is received by the eave portion, and a sign is provided for strong winds. Since the sign surface and the eave portion of the plate body are provided with an inclination angle, the wind and snow blown from the front surface pass through the sign surface from the eave portion without stagnation. However, the above-described embodiment can be applied only to a newly manufactured and installed sign board, and no countermeasures can be taken for a large number of existing road sign boards. Therefore, every winter, the Applicant is concerned that traffic may be impaired due to the snow falling on the signage surface and lowering the visibility, so the applicant has applied the above principle to existing road sign boards. After intensive studies, the present invention has been achieved.

An object of the present invention is to provide a road sign board which solves the above-mentioned problems and suppresses snow from adhering to a sign surface of an existing road sign board.

[0007]

In order to achieve the above object, the present invention has the following arrangement. That is, in the road sign board with suppressed snow accretion according to the present invention, in a structure in which the transparent cover is placed on the sign face of the existing road sign board, the transmission surface facing the sign face of the cover has a depression angle. , The sign surface is closed and locked to the periphery of the sign plate. Also,
The cover may have an upper surface extending from the transmission surface to form an eaves surface having a depression angle larger than at least the transmission surface. Alternatively, a gable roof surface may be formed by extending the upper part of the transmission surface obliquely rearward and upward, and a vertical plate surface may be attached to a protruding edge of the roof to form a snow-cutting plate.

According to the present invention, if the existing road sign board is covered with a transparent covering on the sign surface side and the transmitting surface opposed to the sign surface is formed at a depression angle, snow blows on the sign surface from the side. Even when it comes to snow, the angle at which the snow blows smoothly flows down the transmission surface, so that it is difficult to snow. Therefore,
Since snowfall on the transmission surface is suppressed, the snow can be visually recognized through the sign surface. In addition, the upper front side of the transmission surface extends further, and the eaves surface which forms a more depressed angle than the transmission surface protrudes, and when a single-sided roof surface is formed rearward, snow falling from above is removed from the roof. The snow on the roof surface naturally slipped to the back side of the signage surface, and the transmission surface was inclined obliquely downward and protruded above the transmission surface because it was blocked by the surface and became difficult to adhere to the transmission surface Since the eaves surface is inclined further obliquely downward with respect to the transmission surface, even when strong wind snow blows from the side toward the eaves surface and the transmission surface, the wind hitting the eaves surface is almost It flows down in an obliquely downward direction along the eaves surface without being reduced by wind, and flows down the permeable surface vigorously.Therefore, the wind and snow that blows directly on the permeable surface flows down along with the flow, making snowfall on the permeable surface more efficient. It can be suppressed well. Therefore, snowfall is effectively suppressed for both the snow falling from the top and the snow blowing from the side, so that it is unlikely that snowfall on the transmission surface will lower the line of sight of the marking surface. Become.

Further, a front inclined surface of the gabled roof surface is formed so as to extend to an upper rear portion of the transmission surface, and a vertical plate is attached to an upper protruding side of the gabled roof surface to form a snow plate. May be done. Also in this mode, the snow falling from above is separated by a snowboard when piled up on the roof surface, and the snowboard is separated on the front and back of the road sign board and slides down naturally, and the snow blown from the side has a transparent surface. Due to the depression angle, the snowflakes are blown downward without deceleration along the transmission surface, so that the adhesion of the snowflakes to the transmission surface is also suppressed.

Furthermore, at least the transmitting surface of the coating may be subjected to a water-repellent treatment. That is, since the transmission surface may impair the visibility of the marking surface due to snow accumulation or condensation, both surfaces of the transparent plate constituting the transmission surface are subjected to water-repellent treatment, and the blowing snow is repelled on the water-repellent surface. As a result, it is difficult for snow to accumulate, and dew condensation due to a temperature difference is hardly generated.

[0011]

Next, an embodiment of the present invention will be specifically described with reference to the drawings. FIG. 1 is an upper elevation view showing one embodiment of the present invention, and FIG. 2 is a cross-sectional view of FIG. FIG. 3A is an explanatory diagram showing the flow of wind and snowflakes on a transmitting surface according to the present invention at the time of strong wind and snow, and FIG. 3B is a diagram showing the flow of wind and snowflakes on a conventional marking surface at the time of strong wind. 4A and 4B show another embodiment of the present invention, in which there is no eaves surface, (A) makes the roof surface horizontal, (B) makes the transmission surface large, and makes the roof surface inclined backward. (C) is a cross-sectional view in which the roof surface is formed in a gable shape.

First, in the embodiment shown in FIG. 1, an existing road sign board 2 is attached to a support 1, and a marking surface 21 of the road sign board 2 is covered with a transparent covering 3; Reference numeral 3 denotes a transmitting surface 31 having a depression angle opposed to the sign surface of the road sign board 2, an eave surface 32 extending above the front surface of the transmission surface 31 and forming a depression angle larger than at least the transmission surface,
A roof surface 33 is formed between the upper end of the eaves surface 32 and the upper part of the sign board, and a lid surface 34 is provided so as to close a gap between the sign surface and the transmitting surface, so that the sign surface is closed. It is locked on the periphery of the sign board. The frame locked to the periphery is bolted to a road sign plate via an aluminum mold or the like.

As described above, the transparent transmissive surface 31 that is inclined forward and opposite to the sign surface 21 of the road sign board 2 and the eave portion 32 in which the upper front side of the transparent surface 31 is further bent forward. In the case where the wind or snowflakes blow on the transmitting surface during a strong wind or snow, as shown in the explanatory view of FIG. Since the continuous inclination angle is formed, even if the cross wind blows, the wind blows downward without hardly being reduced on the transmission surface 31. Also, if the transmission surface 31
Even when snowflakes adhere to the wind, the wind flowing down from the eaves 32 along the transmission surface 31 increases the flow speed of the wind because the inclination angle of the eaves is larger than that of the transmission surface. Since it is blown off by a stronger wind, the transmission surface 31
Is always kept transparent, so that the visibility of the road sign board 2 is maintained.

FIG. 3 shows the flow W of the wind as a solid line and the flow S of the snow as a dashed line, and the plate surface of FIG. 3A has a downward inclination angle with respect to the wind blowing direction. The wind will flow down without being decelerated, so the adhesion of snowflakes will be suppressed,
In the case where the snow falls almost perpendicularly to the plate surface of (B), the snowflakes collide with each other and the wind stagnates, so that the snow easily accumulates. Cover up.

As the coating 3 used in the present invention, a resin having high transparency and excellent weather resistance and durability such as polycarbonate resin, acrylic resin and polystyrene resin may be selectively used. Resin is used. Such a polycarbonate resin may be bent or adhered by thermal processing to form the cover 3 or may be formed integrally, and the periphery locked to the road sign plate 2 is provided with a frame such as an aluminum mold. Is used so that it can be screwed with a bolt.
In addition, the surface of the polycarbonate resin is subjected to a water-repellent treatment so as to suppress snowflakes adhering to the transmitting surface or to make it easier to flow down, and to prevent dew condensation on the inner and outer surfaces of the transmitting surface.

As the depression angle of the transmission surface 31 with respect to the marking surface 21 increases, the attachment of snowflakes is more easily suppressed, but the angle difference between the half surface marking surface 21 and the plate surface of the transmission surface 31 increases. As a result, the light transmission efficiency decreases due to the refraction of the light on the transmission surface, and the reflection of the road surface image occurs on the transmission surface, which impairs the visibility of the sign surface. On the other hand, the inclination angle may be set in a range of 10 to 30 degrees.

Similarly, the depression angle of the inner surface of the eave portion 32 is made larger than the depression angle of the transmission surface 31 as an effect of suppressing the attachment of snowflakes on the transmission surface. If the angle becomes smaller, the inner surface of the eave portion 32 hits the inner surface of the eave portion. On the other hand, when the angle is too large, the amount of wind received on the inner surface of the eaves portion 32 decreases, and the amount of air flowing downward also decreases. In general, if the angle is inclined at an angle of 15 to 45 degrees diagonally downward with respect to the vertical plane, the amount of wind that hits the inner surface of the eave portion 32 and flows downward may increase.

Further, in FIG. 2, in the area between the inner surface of the eave portion 32 and the transmission surface 31, the vertical length a of the inner surface of the eave portion having a large inclination angle is longer than the vertical length b of the transmission surface 31. As the wind flows from the eaves part downward along the transmission surface vigorously, if the eaves part becomes extremely long with respect to the transmission surface, it will not be able to withstand the load of snow on the roof part on the eaves upper part, and Since it is not practical, it is preferable that the vertical length a of the inner surface of the eave portion is 1/6 to 2/3 times the vertical length b of the transmission surface.

Next, the result of actual measurement of the snow accretion state in the present invention will be described. As a measuring method, a road sign board according to the present invention in the form shown in FIG. 2 and a normal road sign board are provided in a cold snowy area, and are exposed to a strong wind and snow environment for about one month. Of the snow was observed. Regarding the observation evaluation, if the snow area of the transmission surface is 1/4 or less, the marking surface can be seen through the transmission surface and the marking surface can be visually recognized. Cumulative time in which the surface was not visible. In addition, as a measuring object, α in the shape of FIG.
Was set to 40 degrees, and the angle of β was set to 15 degrees, and the ratio of the vertical length of the transmission surface / the vertical length of the eaves was set to 1/1 was used. As a result, the time during which snow was confirmed during the total observation time of 47,430 minutes was measured by the regular road signboard for 9,6 hours.
The measurement object of the present invention was 1,380 minutes for 50 minutes. Therefore, while the normal road signboard snowed for 20.9% of the total observation time and the sign surface could not be confirmed, the measured object of the present invention was only 2.9%. That is, by attaching the covering to the road sign board, an effect of suppressing snow accumulation of 85.7% was obtained.

In FIG. 4, the cover has the effect of suppressing snow accretion because the transparent surface is inclined forwardly more than the sign surface of the road sign board. Does not necessarily have to be tilted forwardly more than the transmission surface. That is, even if the transmission surface and the eaves portion are the same plane as shown in FIG. 4B, or if a gable roof is provided above the transmission surface in FIG. The effect of doing is not lost. The snow that has accumulated on the gabled roof part separates into the front and back surfaces of the road sign board and slides down, so that a snow eaves hardly occurs on the front surface of the sign surface, so that visibility is not hindered.

As the road sign board, a round sign board, a triangle sign board, a square sign board or the like such as a large sign sign board, a regulation sign board of a predetermined size, a guide sign board, a warning sign board or a non-standard sign sign board is generally used. Because each is a different shape road sign board, the mounting structure is different individually,
By appropriately utilizing the shapes of the transmissive surface and / or the eaves and the roof, a mounting structure suitable for the shape of the road sign board can be made.

[0022]

According to the present invention, if a transparent covering is covered on the sign surface side of the existing road sign board and the transmission surface opposite to the sign surface is formed at a depression angle, snow will lie on the sign surface. Even when the snow is blown from above, it is difficult for the snow to fall because the angle at which the snow is blown smoothly flows down the transmission surface. Therefore, snowfall on the transmission surface is suppressed, and the transmission can be visually recognized through the marking surface. In addition, when the upper front side of the transmission surface is further extended and the eaves surface forming a further depression angle than the transmission surface is projected, and a one-sided roof surface to the rear is formed,
The snow falling from above is blocked by the roof surface, making it difficult to adhere to the transmission surface, the snow piled on the roof surface naturally slides to the back of the sign surface, and the transmission surface is inclined diagonally downward, Since the eaves surface protruding above the transmission surface is inclined further downward and obliquely with respect to the transmission surface, even when strong winds and snow etc. blow from the side to the eaves surface and the transmission surface The wind that hits the eaves surface flows down the eaves surface in an obliquely downward direction with almost no reduction in wind, so that the wind and snow blowing directly on the permeation surface flows down along the flow. In addition, it is possible to more efficiently suppress snow on the transmission surface. Therefore, snowfall is effectively suppressed for both the snow falling from the top and the snow blowing from the side, so that it is unlikely that snowfall on the transmission surface will lower the line of sight of the marking surface. Become.

In this way, the existing road sign boards provided in a large number of snow-covered areas can suppress snow accretion even in the winter and secure visibility, so that safe driving in winter can be realized.

[Brief description of the drawings]

FIG. 1 is an upper elevation view showing an embodiment of the present invention.

FIG. 2 is a side view of FIG. 1 showing one embodiment of the present invention.

FIG. 3A is a diagram illustrating the flow of wind and snowflakes in a strong snowstorm according to the present invention, and FIG. 3B is an explanatory diagram illustrating the flow of wind and snowflakes in a conventional heavy snowfall.

4A and 4B show another embodiment of the present invention, in which no eaves are provided, (A) the roof is horizontal, (B) the transmission surface is enlarged, and (C) the roof. FIG. 3 is a cross-sectional view showing the flow in both directions.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Prop 2 Road sign board 3 Transparent covering 31 Transmissive surface 32 Eave part 33 Roof part 34 Side part 4 Bolt S Snowflake W Wind a Vertical length of inner surface of eave part b Vertical length of transmissive surface α Slope of transmissive surface to vertical plane Angle β Angle of inclination of eaves inner surface to vertical plane

Claims (4)

[Claims] 1. A transparent cover is placed on a sign surface of an existing road sign plate, and the cover plate has a transmissive surface facing the sign surface at an angle of depression and covers the sign surface so as to cover the sign surface. A road sign board in which snowfall is suppressed, characterized in that the signboard is locked to the periphery. 2. The road sign board according to claim 1, further comprising an eaves surface extending above the transmission surface and having a depression angle larger than at least the transmission surface. 3. A gable-shaped roof surface is formed by inclining an upper part of the transmission surface obliquely rearward and upward, and a vertical snowboard is provided on a protruding edge of the gable. The road sign board according to claim 1, wherein snowfall is suppressed. 4. The method according to claim 1, wherein at least the transmission surface is subjected to a water-repellent treatment.
A road sign board in which snow accumulation is suppressed.