JP3462329B2 - Anti-glare plate - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antiglare plate installed along a median strip of a road.

[0002]

2. Description of the Related Art In order to prevent glare from headlights of an oncoming vehicle at night, antiglare plates are installed at appropriate intervals along a median strip of a highway or the like. This antiglare plate is generally provided with an insertion hole B in the longitudinal direction of an antiglare plate body A formed of a substantially rectangular plate-like body as shown in FIG. The lower part of the support leg C is inserted and attached to a guard rail, a column, or the like of the central divider band directly or via a mounting bracket.

[0003]

However, in the conventional anti-glare plate as described above, since the main body of the anti-glare plate is formed of a plate-shaped body, the anti-glare plate does not escape the wind load due to passage of a vehicle or the like. Since the entire surface of the plate body is properly received, there is a problem that the antiglare plate body and the supporting legs are bent or damaged. In order to deal with such a problem, it has been attempted to increase the strength by increasing the wall thickness of the antiglare plate body or the supporting legs, but if the wall thickness is increased, the antiglare plate body and the supporting legs are increased. There was a problem that the weight itself became heavy, the workability was deteriorated, and the material cost was high.

Therefore, the present invention is intended to solve the above problems and provide an antiglare plate in which the wind load is effectively reduced.

[0005]

In order to achieve the above object, the present invention has the following constitution. That is, in the antiglare plate according to the present invention, an insertion hole is provided in the longitudinal direction of the antiglare plate main body, and a support leg is inserted into the insertion hole, and the antiglare plate main body is provided in a frame portion forming an outer peripheral edge. The present invention is characterized in that a plurality of plate-shaped light-shielding bars are arranged at appropriate intervals with their front faces directed obliquely.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Next, embodiments of the present invention will be specifically described with reference to the drawings. That is, FIG. 1 is a front view showing an embodiment of the present invention, FIG. 2 is a sectional view of an upper portion of FIG. 1, FIG. 3 is a sectional view of a supporting leg mounting portion of FIG. 1, and FIG. 4 is an antiglare plate of FIG. 4A and 4B are explanatory views of the main body of the antiglare plate that seeks the wind load reduction effect of FIG.

1 to 4, 1 is an antiglare plate body, and 2 is a supporting leg. The antiglare plate body 1 is made of an appropriate material such as glass fiber reinforced plastic, thermosetting synthetic resin, thermoplastic synthetic resin, etc., and its shape is provided with a frame portion 11 constituting an outer peripheral edge of a substantially rectangular shape, Two inserting portions 12 are provided in parallel in the longitudinal direction in the frame portion 11, and an inserting hole 13 having a substantially square inner shape is formed in the inserting portion 12, and the inserting holes 13 of the supporting legs 2 are formed in the respective inserting holes 13. The upper part is inserted.

The supporting leg 2 is generally a flat plate such as a steel plate or a U-shaped cross section such as a grooved steel, or a substantially M-shaped cross section formed by bending a metal plate. For example, those having a proper cross-sectional shape in consideration of bending strength and weight. The support leg 2 and the antiglare plate body 1 are attached to each other by inserting bolts 3 into the mounting holes formed in the support leg 2 and the insertion portion 12 of the antiglare plate body 1 and tightening them. 2 is firmly integrated with the antiglare plate body 1, but may be integrally formed by molding the antiglare plate body 1 with the support legs 2 inserted. .

The support leg 2 is provided below the support leg 2.
Holes 21 for attaching the to the guardrail or support
Is provided, a bolt is inserted into the bolt hole 21, and the bolt can be mounted via a mounting bracket (not shown).

Further, a reinforcing vertical bar 14 is provided in the center of the frame portion 11 of the antiglare plate main body 1, and the remaining frame portion 11 excluding the vertical bar 14 and the insertion portion 12 is provided. A plurality of plate-shaped light-shielding bars 15 are arranged at appropriate intervals while having overlapping portions with each other with their front faces directed in an oblique direction.

The light-shielding bar 15 may be arranged vertically and vertically or horizontally horizontally, but if it is vertically and vertically arranged, it is likely to be broken left and right. In addition, since it is easy to crack vertically when it is arranged in the lateral direction, in this embodiment, it is arranged so as to be inclined in the left-right direction, and the strength against cracks in the left-right direction and the vertical direction is increased.

As described above, the antiglare plate main body 1 of the present embodiment is provided because a plurality of plate-shaped light-shielding bars 15 are provided at appropriate intervals in the frame portion 11 forming the outer peripheral edge. The plurality of shading bars 15 prevent glare from the headlights, and the wind escapes from the gaps between the shading bars 15 so that the wind load is effectively reduced. Since it is arranged facing the wind from the front of the antiglare plate main body 1, the wind is not obliquely received from the front by the shading bar 15, but the actual surface area to receive the wind is increased. Moreover, the wind load is further reduced because the wind easily escapes.

The interval size of the light shielding bars 15 and the light shielding bars 15
The angle at which the front of the is obliquely directed is not particularly limited, but the larger it is, the more easily the wind escapes, and the actual surface area that receives the wind also increases and the wind load reduction effect expands, Along with this, the overlapping portions of the shading bars 15 are reduced, and the dazzling light leaking from between the shading bars 15 is also increased. There is a need to.

Next, how much wind load is reduced by the antiglare plate according to this embodiment as compared with the conventional antiglare plate will be described with reference to FIG.

If the wind speed is 40 m / min and the antiglare plate body 1 receives this wind from the front, the wind load of 40 m / min is 120 kg / m ² , so the antiglare plate body 1
If is made of conventional plate-like material, 120 per unit area
The wind load P ₀ of kg / m ² will be received.

Next, in the antiglare plate body 1 according to this embodiment, the vertical dimension a is 650 m as the size of the antiglare plate body 1.
m, lateral dimension b of the upper end is 350 mm, lateral dimension c of the lower end is 3
When it is 20 mm, the surface area S ₀ of the antiglare plate body 1 is 0.218 m ² from the above-mentioned dimension, and the frame portion 11 and the vertical bar 1 are
When the width d of 4 is 5 mm, the width e of the insertion portion 12 is 71 mm, and the length f of the insertion portion 12 is 365 mm, the surface area S ₁ of the frame portion 11, the vertical crosspiece 14, and the insertion portion 12 that properly receives the wind is 0. 0.06 m ² , and the surface area S _{2 of the} shading bar 15
Is 0.158 m ² by subtracting the surface area S ₁ of the frame portion 11, the insertion portion 12 and the like from the surface area S ₀ of the antiglare plate body 1.

Assuming that the light-shielding bar 15 is arranged with its front face inclined at 30 degrees, the actual surface area S ₃ of the portion of the light-shielding bar 15 that receives wind is 0 as shown in the following formula 1. Therefore, the actual total surface area S ₄ of the antiglare plate body 1 that receives the wind is 0.242 m ² , which is larger than the surface area S ₀ of the antiglare plate body 1 as shown in Formula ² .

[Equation 1]

[Equation 2]

Therefore, the wind load P ₁ received by the antiglare plate body 1 according to this embodiment per unit area is 10
It becomes 8 kg / m ² , and the wind load received per unit area is reduced by 10% as compared with the conventional antiglare plate body made of a plate-shaped body.

[Equation 3]

[0019]

According to the present invention, a plurality of plate-shaped light-shielding bars are arranged at appropriate intervals in the frame portion forming the outer peripheral edge, and the light-shielding bars are arranged so that their front faces are inclined. As a result, the plurality of light-shielding bars provided prevent glare from the headlights, and the wind escapes from the gaps between the light-shielding bars to reduce the wind load. On the other hand, the wind is not obliquely received by the light-shielding bar, but is obliquely received. Therefore, the actual surface area for receiving the wind is increased and the wind is easily escaped, so that the wind load is further reduced.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

2 is a cross-sectional view of the upper portion of FIG.

FIG. 3 is a cross-sectional view of a support leg attachment portion of FIG.

4A and 4B are explanatory views of a main body of the antiglare plate that seeks the wind load reducing effect of the antiglare plate of FIG. 1, in which FIG. 4A is a front view thereof, and FIG.

FIG. 5 is a perspective view showing a conventional antiglare plate.

[Explanation of symbols]

1 Anti-glare plate body 11 frame 12 Insert 13 insertion hole 14 vertical bars 15 Shading bars 2 support legs 21 bolt holes 3 bolts

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) E01F 7/06

Claims (2)

(57) [Claims] 1. An antiglare plate body is provided with an insertion hole in a longitudinal direction thereof, and a support leg is inserted into the insertion hole.
An anti-glare plate, characterized in that a plurality of plate-shaped light-shielding bars are arranged in the frame portion forming the outer peripheral edge at an appropriate interval with the front facing diagonally. 2. The antiglare plate according to claim 1, wherein the light-shielding bar is arranged so as to be inclined in the left-right direction.