JP2000027278A - Grating with nonskid projection - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure of a grating with nonskid projections, which has more slippage preventive effect, less wear and deformation and better running property. SOLUTION: A grating 10 includes a number of main members 20 parallelly arranged in a predetermined plane shape with end bars 30 at both ends and middle twisted bars 35, the main members 20 consisting rising piece parts 21 and upper piece parts 22 having a thickness almost equal to that of the rising piece part in a sectionally T-shape. On the upper faces of the upper pieces, a number of protrusive streaks 25 having a height almost equal to or greater than the thickness of the upper piece part and inclined to the longitudinal direction of the upper piece parts are provided at equal spaces all over in their cross direction and the inclined protrusion streaks are so arranged as to have the adjacent ends 25a, 25b overlapping each other on a line L perpendicular to the longitudinal direction of the upper piece parts.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grating, and more particularly, to a non-slip grating.

[0002]

2. Description of the Related Art Gutters (groove lids) provided on road drains, especially on road side ditch or road crossing ditch such as an expressway or a road with a lot of traffic or a lot of curves are required to have high slip resistance. A non-slip grating 50 as shown in FIG. 5 is used. The grating 50 with a non-slip is provided with a projection 52 having a height of 1 mm and spaced apart from the upper surface of a main member 51 having an I-shaped cross section to form an uneven portion 53 so as to prevent the vehicle from slipping. 5 and 6, reference numeral 55 denotes a twist bar for connecting and integrating the main members 51 at predetermined intervals, 56 denotes end bars provided at both ends of each main member 51, and 57 denotes a frame member.

[0003] However, since the projection 50 is formed on the upper surface of the main member 51 having an I-shaped cross section as described above, the uneven portion 53 serving as a non-slip of the vehicle is provided. Not enough in width and height of
High anti-slip effect could not be expected. In particular, when used on a highway or a place with a lot of traffic, the protrusion 52 is worn in a short period of time, or a sufficient anti-slip effect cannot be obtained due to sand or the like during rain. There was a problem.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and has a high anti-slip effect, and has a high durability even when used on a highway or a place where traffic is heavy. Another object of the present invention is to provide a novel non-slip grating structure which has less wear and deformation and good running properties.

[0005]

That is, according to the present invention, there is provided a grating comprising a plurality of main members arranged in a predetermined plane by end bars at both ends and a twist bar at an intermediate portion. Is formed in a T-shaped cross section including a standing piece portion and an upper piece portion having a thickness substantially equal to the standing piece portion, and the upper piece portion upper surface has a thickness substantially equal to or greater than the thickness of the upper piece portion. A large number of ridges having a height and inclined with respect to the longitudinal direction of the upper piece are projected at equal intervals over the entire width direction thereof, and adjacent end portions of the inclined ridges are provided. Are arranged so as to overlap with each other on a line orthogonal to the longitudinal direction of the upper piece portion, and are provided with non-slip grating.

The invention according to claim 2 relates to the non-slip grating according to claim 1, wherein the inclined ridge portion is formed in a straight line.

A third aspect of the present invention relates to the non-slip grating according to the first or second aspect, wherein the inclined ridges are arranged so that the inclination directions of the inclined ridges are alternately arranged in adjacent main members.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is an overall plan view showing grating according to an embodiment of the present invention, FIG. 2 is a partial perspective view of a main member thereof, FIG. 3 is a partial plan view in which a part of FIG. 1 is enlarged, and FIG.
FIG. 4 is a sectional view taken along line 4-4 in FIG.

The illustrated grating 10 is provided at a groove opening such as a drainage groove, and is made of a metal such as steel, stainless steel, or a casting. As shown in FIG. Numerals 20 and 20 are formed in a predetermined planar shape (a rectangular shape in the figure) by end bars 30 at both ends and a twist bar 35 at an intermediate portion. The grating 10 in the embodiment is for a road crossing groove, and has a width of about 50.
It has a size of 0 mm and a length of 1000 mm. In this case, the traveling direction of the vehicle is the arrow PP direction in the figure.

In FIG. 1, an end bar 30 is made of flat steel, and is welded and fixed to both ends of a main member 20.
Is fixed in a predetermined shape. Further, the twist bar 35 is made of a torsion angle steel and is crimped in a direction perpendicular to the main member 20 to hold the main member 20 in parallel at regular intervals and increase the overall strength.

The main member 20 in the structure of the present invention is shown in FIG.
As is well understood from the perspective view of FIG. 2, the upper piece 22 is formed in a T-shaped cross section including a vertical piece 21 and an upper piece 22 having a thickness substantially equal to the vertical piece 21. Is formed with an inclined ridge 25 having a thickness substantially equal to or greater than the upper piece 22. The upper piece 22 is set to the standing piece 2
The configuration of a T-shaped cross section having a thickness substantially equal to 1 is as follows.
This is for the purpose of increasing the surface area of the upper piece portion 22 and providing the inclined projection 25 having a large height. In an embodiment,
The thickness t1 of the standing piece 21 and the thickness t2 of the upper piece 22 are both about 4 mm, and the height h of the inclined ridge 25 is about 5 m.
m.

A large number of inclined ridges 25 are provided at an equal interval with respect to the longitudinal direction A of the upper piece 22 and at equal intervals over the entire width B of the upper piece 22. At the same time, the inclined ridges 25 are arranged such that the respective ends (for example, 25a and 25b in FIG. 2) of the adjacent inclined ridges 25 overlap each other on a line L orthogonal to the longitudinal direction A of the upper piece 22. Are located. That is, each inclined convex portion 25 is formed without a gap on a line L orthogonal to the longitudinal direction A of the upper piece portion 22. For such an arrangement, the interval and the inclination angle of each inclined ridge 25 are selected. In the embodiment of FIG. 2, the interval D between the inclined ridges 25 is about 9 mm, and the inclination angle d is about 30 degrees. Incidentally, the width b of the upper piece 22 is about 18 mm, and the width w of the inclined ridge 25 is about 5 mm.

The arrangement of the inclined ridges 25 as described above means the following. First, the inclined ridge 25 is formed by the upper piece 2.
2 is formed without a gap on a line L orthogonal to the longitudinal direction A, so that a vehicle or the like passing through the upper piece portion 22 always has the inclined protruding ridge portion 25 at any position in the single main member 20. As a result, the grating has an extremely large contact area with the passing vehicle as a whole, has a high gripping force, and has a large anti-slip effect. Secondly, even when the inclined piece 25 having a height is formed on the upper piece 22, the passing vehicle or the like always contacts the inclined piece 25 at any position in the single main member 20. Good runnability without rattling. Third, as shown in FIGS. 3 and 4, the main members 20 (20A, 20B, 20C, 20D,
20E), when the twist bar 35 which is perpendicular to the longitudinal direction is crimped, the twist bar 35 is attached to any one of the inclined ridges 25, 25, 25, at any position of each main member 20.
25, 25 and has a high coupling force. In other words, since the twist bar 35 is fixed to the inclined ridge 25 without any gap in each main member 20, high strength is maintained as the entire grating. Even when a foreign substance such as a stone is caught in the space S between the main members 20, the main members 20 are prevented from being easily spread or deformed.

The inclined ridge 25 of the grating 10 in the illustrated embodiment is formed in a straight line (oblique line) as defined in claim 2, but may be formed in a flat V-shape or the like. You can also.

In the grating 10, as shown in FIGS. 1 and 3 and as defined in claim 3, the inclination directions of the inclined ridges 25 of the adjacent main members 20 are alternately arranged. With this arrangement, the anti-slip effect can be further enhanced. In order to arrange in this manner, it is only necessary to alternately arrange the main members 20 in front and rear in the longitudinal direction.

[0016]

As shown and described above, the non-slip grating according to the present invention is characterized in that the main member is formed in a T-shaped cross section including a standing piece and an upper piece having a thickness substantially equal to the thickness of the standing piece. With this configuration, the upper piece has a larger area and a higher strength than a conventional I-shaped main member.
On the upper surface of the upper piece having a large area, a ridge having a thickness substantially equal to or greater than that of the upper piece and inclined with respect to the longitudinal direction of the upper piece extends over the entire width thereof. By protruding a large number at equal intervals, it is possible to provide a non-slip portion having a high anti-slip effect, excellent strength, and durability.

In particular, in the present invention, as described above, the adjacent end portions of the inclined ridge portion are arranged so as to overlap each other on a line orthogonal to the longitudinal direction of the upper piece portion. A passing vehicle or the like always contacts the inclined ridge at any position in a single main member, so that the entire grating has an extremely large contact area, has a high gripping force, and has a large anti-slip effect. At the same time, running performance is good. Further, even when the twist bar is connected to the twist bar, the twist bar engages with any of the inclined ridges at any position of each main member, so that high strength is maintained as a whole grating and stones are formed in the space between the main members. The main member is prevented from being easily spread or deformed even when foreign matter such as is trapped.

Further, in the grating defined in claim 2, the manufacture is easy by forming the inclined ridges in a straight line.

Further, in the grating defined in claim 3, since the inclined ridges are arranged so that the inclination directions of the inclined ridges are alternately arranged in the adjacent main members,
The grip force is improved, and a high anti-slip effect is achieved for passing vehicles and the like.

[Brief description of the drawings]

FIG. 1 is a plan view showing grating according to an embodiment of the present invention.

FIG. 2 is a partial perspective view of the main member.

FIG. 3 is a partial plan view in which a part of FIG. 1 is enlarged.

FIG. 4 is a sectional view taken along line 4-4 in FIG. 3;

FIG. 5 is a partial perspective view showing an example of conventional grating with anti-slip.

FIG. 6 is a partial sectional view thereof.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Grating with non-slip 20 Main member 21 Standing piece part 22 Upper piece part 25 Inclined ridge 30 End bar 35 Twist bar

Claims (3)

[Claims] 1. A grating in which a number of main members are juxtaposed in a predetermined plane shape by end bars at both ends and a twist bar at an intermediate portion, wherein the main members are substantially the same as the standing piece and the standing piece. It is configured in a T-shaped cross section composed of an upper piece having a thickness, and the upper surface of the upper piece has a height substantially equal to or greater than the thickness of the upper piece and has a height in the longitudinal direction of the upper piece. A large number of convex ridges that are inclined with respect to each other are provided at equal intervals over the entire width direction thereof, and adjacent ends of the inclined convex ridges are mutually separated on a line orthogonal to the longitudinal direction of the upper piece. Non-slip grating that is arranged to overlap. 2. The non-slip grating according to claim 1, wherein the inclined ridges are formed in a straight line. 3. The non-slip grating according to claim 1, wherein the inclined ridges are arranged such that the inclination directions of the inclined ridges are alternately arranged in adjacent main members.