JP3294791B2 - Large grating - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a large-sized grating used for a drain cover, a ditch cover for an irrigation channel or the like, a sash cover, and the like.

[0002]

2. Description of the Related Art A large-sized grating of this type is, for example, as shown in FIGS. 3 to 5, for a main member 1 made of a plurality of steel members having an I-shaped cross section which are arranged in parallel at a predetermined interval from each other. A plurality of horizontal plate members 2 made of flat steel having a height smaller than the height of the main member 1
The horizontal plate member 2 is assembled by welding in a grid shape so that the upper end surfaces of the horizontal plate members 2 are flush with each other. The main member 1
End plates 3 made of the same flat steel material as the horizontal plate member 2 are provided at both ends in the length direction. Further, between adjacent main members 1, 1, a plurality of auxiliary members 4 made of a thin steel material having an upper end surface having a width smaller than the width of the upper end surface of the main member 1 are parallel to the main member 1, The upper end surface of the main member 1 and the upper end surface of the auxiliary member 4 are arranged so as to be substantially flush.

In such a large grating, for example, receiving frames 6 and 6 are installed at both ends in the groove width direction of the opening of the drain groove 5, and the length direction and the groove width direction of the main member 1 are placed on the receiving frames 6 and 6. By being placed so as to match, it is suitably used as a heavy load and a long span. In order to allow a vehicle or a pedestrian to travel safely without slipping, the upper end surface of each auxiliary member 4 is provided with anti-slip irregularities 7 as shown in FIG.
Is formed by hot working. However, the width of the upper end surface of the main member 1 is quite wide, usually 30 to 36 mm, so that it is difficult to form unevenness even by hot working, and the manufacturing cost is very high even if it is formed by cutting. Therefore, it is used in a smooth surface state.

[0004]

In the above-described large-sized grating, as described above, the use of a large number of auxiliary members 4 which are relatively thin and which is easy to form unevenness on the upper end surface has a non-slip function. The wide upper end surface of each main member 1 is used in a smooth surface state due to difficulty in processing.
5 and the auxiliary member 4 disposed in the immediate vicinity of FIG.
The interval a is provided as shown in FIG. For this reason, there is a region where the anti-slip function cannot be exerted in a considerably wide interval b between the auxiliary members 4 and 4 adjacent to each other with the main member 1 interposed therebetween. It is difficult to secure sufficient safety, and there is room for further improvement in this regard.

According to the present invention, a plurality of cross sections I
In a large grating consisting of a main member having a shape, a plurality of horizontal plate members, and a large number of auxiliary members, by devising a method of arranging the auxiliary members, the main member having an I-shaped cross section is used to reduce manufacturing costs. It is an object of the present invention to improve the safety by allowing the upper end surface of the member to exhibit the anti-slip function at the relevant portion in the same manner as at other portions even if the upper surface of the member is not processed.

[0006]

SUMMARY OF THE INVENTION According to the present invention, a plurality of main members having an I-shaped cross section are arranged in parallel at a predetermined distance from each other, and the height of the main members is smaller than the height of the main members. A plurality of horizontal plate members are assembled in a lattice shape so that the upper ends of these main members and the horizontal plate members are flush with each other, and end plates are provided at both ends in the length direction of the main member. A plurality of auxiliary members disposed between adjacent main members, each having an upper end surface having a width smaller than the width of the upper end surface of the main member, and having a non-slip irregularity formed on the upper end surface. However, in a large grating parallel to the main member and arranged so that the upper end surfaces of the main member and the auxiliary member are substantially flush with each other, the auxiliary member closest to the main member among the auxiliary members is the main member. It is characterized in that it is in a contact state.

[0007]

[Effect] Even if no unevenness is formed on the upper end surface of the main member, the unevenness on the upper end surface of the auxiliary member which is brought into contact with the main member and which is inexpensive to manufacture is formed on the main member. Since the non-slip function lacking at the end surface can be supplemented, the anti-slip function can be provided substantially uniformly over the entire grating road surface in combination with the unevenness of the upper end surface of the other auxiliary member.

[0008]

1 and 2 show an embodiment of the present invention.
It will be described based on. Since the entire structure of the large grating according to the present invention is the same as that of the conventional example shown in FIGS. 3 to 6, the same members are denoted by the same reference numerals and description thereof is omitted. Only the arrangement of the auxiliary members different from those will be described.

As shown in FIGS. 1 and 2, a plurality of auxiliary members formed by forming continuous non-slip irregularities 7 on the upper end surface by continuous hot rolling between the adjacent main members 1 and 1 as a raw material. The member 4 is arranged in parallel with the main member 1. At this time, the auxiliary member 4 a arranged closest to the main member 1 is brought into contact with the main member 1. Accordingly, even if the upper end surface 1a of the main member 1 is not subjected to the unevenness processing, the slippage lacking in the upper end surface 1a of the main member 1 is caused by the unevenness 7 on the upper end surface of the auxiliary member 4a which is in contact with the lower end and has a low manufacturing cost. The stop function can be supplemented.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS To illustrate the specific dimensions of the large grating, the vertical dimension (dimension in the groove width direction) Y is 1000 mm and the horizontal dimension X is 995 mm. The height H of the main member 1 is 150 mm,
The width T of the upper end surface 1a is 36 mm, and the thickness t of the web 1b is 5 m.
m and the pitch P are 192 mm. The height h of the horizontal plate member 2 is 50 mm, the thickness t is 6 mm, and the pitch p is 100 mm. The height h of the auxiliary member 4 is 19 mm, the thickness t is 6 mm, and the pitch p is 33 mm.

A horizontal main member 9 made of I-section steel is installed at a location corresponding to the vicinity of the center in the groove width direction,
Although a stronger grating is obtained, the horizontal main member 9 is not always necessary.

[0012]

According to the large-sized grating of the present invention, the wide upper end surface of the main member having the I-shaped cross section has a smooth surface without being processed with anti-slip irregularities. The unevenness of the upper end surface of the abutting auxiliary member can compensate for the anti-slip function lacking in the upper end surface of the main member, thereby improving safety. Since the upper end surface of the main member does not need to be roughened, a large grating for a heavy load and a long span can also reduce the manufacturing cost.

[Brief description of the drawings]

FIG. 1 is a plan view of a large grating showing one embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA in FIG.

FIG. 3 is a plan view of a conventional large grating.

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

FIG. 5 is a sectional view taken along line CC in FIG. 3;

FIG. 6 is a perspective view of a part of the large-grating auxiliary member of FIG. 3;

[Explanation of symbols]

 Reference Signs List 1 main member 2 horizontal plate member 3 end plate 4 auxiliary member 7 unevenness

Claims (1)

(57) [Claims] 1. A plurality of horizontal plate members having a height dimension lower than the height dimension of a plurality of I-shaped main members arranged in parallel at a predetermined interval from each other. The upper ends of these main members and the horizontal plate members are assembled so as to be orthogonal so that they are flush with each other, and end plates are disposed at both ends in the length direction of the main members. Between the main members, a plurality of auxiliary members having an upper end surface having a width smaller than the width of the upper end surface of the main member and having unevenness for preventing slip on the upper end surface are parallel to the main member. The upper end surface of the main member and the upper end surface of the auxiliary member are arranged so as to be substantially flush with each other, and among the auxiliary members, the auxiliary member closest to the main member is brought into contact with the main member. Large grating characterized by being.