JPH0860738A - Grating and manufacture therefor - Google Patents

Abstract

PURPOSE: To make running of a vehicle and walking of a passerby safe and comfortable by pushing in a cross member between main members and fixing the same, and forming the cross member and a net material in such a manner as to be flush with the main members to eliminate any difference in level on the surface. CONSTITUTION: Main members 1 disposed at designated spaces and cross members 2, 2 disposed at designated spaces in such a manner as to cross the above members are projection-welded. At this time, net materials 3, 3 such as an expand metal or th like are interposed between the main member 1 and the cross member 2, and a notch 5 for the thickness of the net material 3 is formed on the main member and welded to the main member except the fitting parts 4,4 of the cross member 2. Accordingly, the cross member 2 is pushed in between the main members 1 and fixed, and the cross member 2 and the net material 3 are formed in such a manner as to be flush with the main member 1. The width of the fitting part 4 is preferably 3/4-5/4 as large as the diameter of the cross member 2. Thus, the need of fixing the net material 3 by a frame can be eliminated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grating and a method of manufacturing the same, and more particularly to a gutter cover or a gutter cover of a road or an underground passage or a cover of a ventilation opening provided on a road such as a subway, or water absorption of a factory or the like. The present invention relates to a grating that can be suitably used for a lid of an opening such as a mouth or a drainage port.

[0002]

2. Description of the Related Art FIG. 3 is a perspective view of a conventional grating. In this type of grating, generally, a main member 1 made of a metal material such as a strip steel or a bar steel is arranged at a predetermined interval in the width direction, and a horizontal member 2 made of a round bar or a twist bar is intersected with the main member 1 to cross it. Like the members, they are arranged at predetermined intervals, and are welded by projection welding so that the lateral members 2 are pushed between the main members 1 and are flush with each other.

[0003]

By the way, the above-mentioned grating is generally used as a gutter cover or a gutter cover of a road or a sidewalk, or a cover of a ventilation opening provided on a road such as a subway or a cover of a drainage or water intake of a factory. Although it is used after being cut into that shape and framed as such, since the spacing between the main member 1 and the lateral member 2 for grating is relatively large, the space S for grating (see FIG. 3) is large, and the lid for the above-mentioned application is used. When used as, for example, various dust such as dead branches, dead leaves, cigarette butts of a size smaller than this space S flows with rainwater or blows in with wind and accumulates in the ditch or underground, and cleaning of the accumulated dust is unavoidable. In addition to the problem of being lost, there is also the problem that the heel of the shoe fits in the case of the lid provided on the sidewalk and it is difficult to walk.

On the other hand, in order to solve the above problems, it is also known that an expanded metal, a wire mesh or the like having a relatively fine mesh is directly spot-welded on the surface of the grating or is spot-welded together with the frame on the outer periphery. However, the welding strength is not always sufficient and there is a problem that it will come off due to the vibration of a moving vehicle etc.In addition, since the entire surface is covered with wire mesh etc., it is not known that there is grating below and it is stable Lacking,
I feel uneasy to drive or walk on it. There is also the problem that it is difficult to walk with expanded metal. Furthermore, when a frame is provided around the grating by welding and fixing it with a frame, there is a step between the frame and the frame, which impairs the running performance of the car on the road and is difficult to walk on the sidewalk. There is also a problem.

The present invention has been made in view of the above problems, and an object thereof is to provide a grating in which a wire mesh is attached without a step and without being detached, and a manufacturing method thereof.

[0006]

In order to achieve the above object, in the grating according to the present invention, a mesh member is interposed between the main member and the horizontal member, and the horizontal member is pushed between the main members. The horizontal member and the net member are fixed and are formed flush with the main member.

The grating manufacturing method according to the present invention is manufactured by projection welding a main member arranged at a predetermined interval and a lateral member intersecting with the main member and similarly arranged at a predetermined interval. In the grating manufacturing method according to the above, while a net material is interposed between the main member and the horizontal member, a projection for the thickness of the net material is formed in the main member except for the attachment position of the horizontal member to perform projection welding. It is a thing.

In the above manufacturing method of the grating, a round bar or a twist bar is used as the lateral member,
It is preferable that the width of the attachment position of the horizontal member formed on the main member is 3/4 to 5/4 of the diameter of the horizontal member.

[0009]

In the present invention, since the mesh member is interposed between the main member and the lateral member and the lateral member is pushed between the main members to form a flush surface, it is necessary to fix the mesh member with the frame. Since there is no surface, there is no step on the surface and the running performance of the car is improved in the case of a road. Also, it becomes easier to walk on the sidewalk. In addition, the horizontal members and the mesh members can be seen alternately from the surface, and there is no anxiety when running in a car or walking. Further, even if the net material is expanded metal, the problem that it is difficult to walk because it alternates with the lateral member is alleviated.

In the above-mentioned grating, a net material is interposed between a main member and a lateral member which are arranged so as to intersect with each other, and a notch corresponding to the thickness of the net material is removed from the main member except for the attachment position of the lateral member. Is preferably formed by projection welding to produce
Thereby, the net material is interposed between the main member and the lateral member,
In addition, since the horizontal member can be pushed between the main members to form a flush surface and the horizontal member and the main member are firmly welded, the net material is surely prevented from coming off due to vibration of a moving automobile or the like. Above, the grating produced is the paragraph number above

The operation and effect described in [0009] can be reliably achieved.

In the above manufacturing method, a round bar or a twist bar is used as the horizontal member, and the width of the mounting position of the horizontal member formed on the main member is 3/4 to 5 of the diameter of the horizontal member.
/ 4 is preferable, and if it is less than 3/4, the main member has a long notch and the net member can be stably formed flush therewith, but the width of the mounting position of the horizontal member is short, so that the horizontal member is short. Welding strength to the main member is weakened. On the other hand, if it exceeds 5/4, the width of the mounting position of the lateral member becomes long and the welding strength to the main member of the lateral member can be obtained, but the net material is bulged at both ends of this mounting position, and it is difficult to form a flush surface. . In addition, it is necessary to increase the pressure applied during projection welding, which causes various problems in terms of manufacturing.

As the net material, a wire net or expanded metal can be preferably used, but a net made of a strength member such as a fiber reinforced resin may be used. The roughness of these eyes is
It is necessary to use properly depending on the use such as a gutter cover or a gutter cover of a road or an underpass, or a cover of a ventilation opening opened on the road such as a subway. For example, in gutter lids and gutter lids on roads and underpasses, it is only necessary for rainwater to pass through, so the eyes may be relatively fine, but in the case of ventilation port lids, etc., the opening area that matches the intake and exhaust volumes is necessary. Also, in the case of water absorption and drainage port lids in factories, etc., an opening area suitable for the amount of water absorption and drainage is required.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a grating according to the present invention,
Is a top view and b is a partially enlarged cross-sectional view taken along line X-X of a.

In the figure, 1 is a flat steel which is a main member, 2 is a twist bar which is a lateral member, and 3 is an expanded metal. The flat steel 1 is formed with a notch 5 for the thickness of the expanded metal 3 except for the mounting portion 4 of the twist bar 2, and the length of the mounting portion 4 is approximately the same as the diameter of the twist bar 2. Has become.

In the grating having the above-mentioned structure, the flat steel 1 having the mounting portion 4 and the notch 5 is formed at predetermined intervals and at each flat steel 1
The mounting parts 4 are arranged side by side, the expanded metal 3 is placed thereon, and the twist bar 2 is arranged on the mounting parts 4 arranged side by side on the expanded metal 3. After that, pressure is applied between the lower electrode of the flat steel 1 and the upper electrode of the twist bar 2 to perform projection welding to manufacture.

Due to the pressure applied by the projection welding, the twist bar 2 is pressed between the flat bar 1 while melting at the mounting part 4 of the flat bar 1, and at this time, between the mounting part 4 and the twist bar 2. And the expanded metal 3 in the vicinity thereof is also melted and blown. And twist bar 2
And the expanded metal 3 is pressed to a position where the upper surface of the expanded metal 3 is flush with the upper surface of the mounting portion 4 of the flat steel 1, whereby the expanded metal 3 is firmly mounted and is formed substantially flush with the upper surface of the twist bar 2. The grating is manufactured.

Incidentally, as a main member, the length of the upper surface is 7.5 mm ×
Flat steel 1 with a height of 50 mm, in which mounting parts 4 with a height of 4 mm are formed at 100 mm intervals, is arranged at 30 mm intervals, and expanded metal 3 (distance between centers in the shorter direction of the mesh is 12 mm).
× The center of the mesh in the long direction (30.5 mm) is placed, and a 6 mm square twist bar 2 is placed as a transverse member on the expanded metal 3 and the general welding conditions (current 5000A × Pressure force 7.8M
When pressure welding was performed with (Pa), a grating having a flat upper surface and the expanded metal 3 firmly attached was manufactured. In addition, in the case where the length of the mounting portion 4 of the flat steel 1 is 12 mm, the welding pressure is increased up to 1.2 times, but the mounting portion 4
The expanded metal 3 on both ends of was crushed and could not be formed flush with the rest.

FIG. 2 is a grating according to another embodiment of the present invention, in which a is a top view and b is a partially enlarged sectional view taken along line YY of a. In this example, the main member is flat steel 6,
This is an example in which a round bar 7 is used for the lateral member and a crimp wire net 8 is adopted for this. The flat steel 6 is formed with a notch 10 corresponding to the thickness of the crimp wire net 8 except the mounting portion 9 of the round bar 7.
The length of the mounting portion 9 is substantially the same as the diameter of the round bar 7.

In the grating having the above construction, similarly to the case where the expanded metal 3 described above is adopted, the flat bars 6 having the mounting portions 9 and the notches 10 are arranged at predetermined intervals at the mounting portions 9 of the flat steels 6. The positions are arranged side by side, the crimp wire netting 8 is placed on it, and the round bar 7 is placed on the wire netting 8 and the mounting portions 9 which are arranged side by side. It is manufactured by pressurizing and welding between the lower electrode and the upper electrode of the round bar 7.

[0020]

As described above, the grating according to the present invention can be applied to the gutter lids or gutter lids of roads, sidewalks, etc., or the lids of ventilation openings provided on the roads of subways, etc., or the drainage or water intake of factories. When processed and used as a lid, etc., the net material is firmly attached and the top surface is flush, so it can be processed into a lid without attaching a frame that is a step on the surface, and in the case of a road Will improve the driving performance of the car. Also, it becomes easier to walk on the sidewalk. In addition, the horizontal members and the mesh members can be seen alternately from the surface, and there is no anxiety when running in a car or walking. Further, even if the net material is expanded metal, the problem that it is difficult to walk because it alternates with the lateral member is alleviated.

According to the manufacturing method of the grating of the present invention, the net material is interposed between the main member and the lateral member,
In addition, the horizontal member can be pressed between the main members to form a flat surface, and the horizontal member and the main member can be firmly welded to each other. It can be suitably used after being processed into a lid of a ventilation port provided or drain of a factory or a lid of a water intake port.

[Brief description of drawings]

FIG. 1 is a grating according to the present invention, in which a is a top view and b is a partially enlarged cross-sectional view taken along line X-X of a.

FIG. 2 is a grating according to another embodiment of the present invention, in which a is a top view and b is a partially enlarged cross-sectional view taken along line YY of a.

FIG. 3 is a perspective view of a conventional grating.

[Explanation of symbols]

1,6: Main member 2,7: Horizontal member
3: Expanded metal 4, 9: Mounting part 5, 10: Cut part
8: Crimp wire mesh

Claims (3)

[Claims] 1. A net member is interposed between a main member and a horizontal member, and the horizontal member is pushed between the main members to be fixed so that the horizontal member and the net member are formed flush with the main member. Characteristic grating. 2. A method of manufacturing a grating, which is manufactured by projection welding a main member arranged at a predetermined interval and a horizontal member intersecting the main member and arranged at a predetermined interval in the same manner, in a grating manufacturing method. A method for manufacturing a grating, characterized in that while a net material is interposed between the member and the main member, a notch corresponding to the thickness of the net material is formed in the main member except for the attachment position of the lateral member and projection welding is performed. 3. The method for manufacturing a grating according to claim 2, wherein the lateral member is a round bar or a twist bar,
A method for manufacturing grating, wherein the width of the mounting position of the horizontal member formed on the main member is 3/4 to 5/4 of the diameter of the horizontal member.