JP3241199U - cable rack - Google Patents

Abstract

An object of the present invention is to provide a cable rack whose strength is increased and its weight is reduced, and in which the arrangement of the embossed portions is optimized. A cable rack 1 is made of iron and has a large number of sub-girders 3 installed between a pair of long main girders 2 arranged in parallel. An upper horizontal piece portion 21 and a lower horizontal piece portion 22 protrude inward from the upper and lower ends of the vertical piece portions 23 of the pair of main girders 2 . A large number of secondary girders 3 are mounted and fixed at equal intervals so as to bridge between a pair of main girders 2. - 特許庁The vertical piece portion 23 is provided with a large number of straight punched portions 5 and 6 each having an arcuate cross section. The embossed parts 5 and 6 are arranged between the girders arranged at equal intervals and have inclination angles opposite to each other. The inclination angle of the embossed parts 5 and 6 is an inclination angle that descends toward the middle of two adjacent stringers 3 . [Selection drawing] Fig. 1

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cable rack used for wiring various cables such as power trunk lines and communication trunk lines.

Cable racks or cable trays (hereinafter referred to as "cable racks") are formed in a ladder shape by constructing a plurality of sub-girders between a pair of main girders, and cables are mounted thereon.

If the cable rack bends, the cables installed on the cable rack will be loaded. Ribs are provided to increase the bending strength. For example, Patent Literature 1 discloses a cable rack as a master girder having a cross section of a bow shape and arranged in parallel on both sides so as to face each other.

Further, in Patent Document 2, the main girder is an elongated member having a substantially I-shaped cross section, and includes a horizontal upper member, a horizontal lower member, and a horizontal upper member and a horizontal member extending in the longitudinal direction, respectively. and vertical members connecting the lower members.

Moreover, although it does not relate to reinforcement of a main beam, Patent Document 3 is known as a technique for reinforcing a cover used for a cable rack by forming a plurality of embossed portions. The cover is reinforced by embossing to form embossments.

Japanese Patent Application Laid-Open No. 2003-111235 JP-A-11-275726 JP 2016-135012 A

A main girder is formed by bending an iron plate with a press or extruding it from a die (aluminum extrusion molding), and there are many horizontal portions over the entire length. In order to reduce the deflection of the cable rack when it receives a load and to reduce the weight of the cable rack itself, there is a tendency to increase the length of the overhang due to bending.

When the area of the horizontal portion that protrudes by folding increases, dust tends to accumulate, making cleaning difficult. In addition, since the cable rack is supposed to be installed outdoors, there is a problem that snow or rainfall accumulates on the horizontal portion outdoors, which increases the weight and bends the cable rack.

On the other hand, it is known to increase the strength without increasing the plate thickness by providing a stamped portion such as embossing. In Patent Document 3 (FIG. 6), there is an example in which the embossed portion is provided on the cover for the cable rack, but the embossed portion is provided only in the width direction of the cover (the direction perpendicular to the length direction of the cable rack). is.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a cable rack that has increased strength, is lighter in weight, and has an optimized layout of the embossed portions.

According to the cable rack of the present invention, a pair of parallel master girders having an upper horizontal piece portion and a lower horizontal piece portion protruding inward from the upper and lower ends over the entire length of the horizontally long vertical piece portion;
a large number of sub-girders mounted and fixed on the lower horizontal piece portion at equal intervals in the length direction of the main girder so as to bridge between the pair of main girder;
A large number of straight punched portions having an arcuate cross section formed by punching out from the vertical piece portion toward the inner side of the pair of master girders,
The plurality of embossed portions are arranged in a row in the length direction of the vertical piece portion and are arranged two by two at intervals of the child girders arranged at equal intervals,
The embossed portions adjacent to each other centering on a certain girder have inclination angles that are opposite to each other between the lower horizontal piece portion and the upper horizontal piece portion, and the inclination angles are equal to the adjacent girder characterized by an inclination angle that descends toward the middle of the

According to the cable rack of the present invention, the self-weight of the cable rack is lightened by providing the embossed part with an inclination angle that descends toward the gap between the child girder in a V-shape centered on a certain child girder. , and the deflection can also be reduced. The protrusion of the embossed portion is slight and is provided in a slanted shape, so dust is less likely to accumulate and is easy to clean. In addition, even if it is placed outdoors, it is difficult for rainfall and snow to accumulate, and as a result, the weight does not increase and the deflection does not increase.

1A is a left side view, FIG. 1B is a plan view, FIG. 1C is a right side view, FIG. 1D is a front view, FIG. 1E is a perspective view, and FIG. 1F is a embossed portion. is a diagram showing a cross-section of. 2A and 2B show the cable rack in this embodiment, FIGS. 2C and 2D show a comparative example, and FIGS. 2E to 2G are diagrams for explaining the action. FIG. 11 shows a cable rack made in accordance with the Examples;

FIG. 1 is a diagram for explaining the configuration of a cable rack 1 according to an embodiment of the invention. A cable rack 1 is made of iron and is constructed by constructing a large number of sub-girders 3 between a pair of long main girders 2 arranged in parallel.

In FIGS. 1A and 1C, each master girder 2 has a horizontally long and vertical vertical piece 23 and a cable rack 1 extending from the lower end of the vertical piece 23 to the inside of the pair of master girders 2 over the entire length of the vertical piece 23 . and an upper horizontal piece portion 21 projecting in the width direction of the cable rack 1 from the upper end of the vertical piece portion 23 toward the inside of the pair of main girders 2 over the entire length of the cable rack 1. is equipped with In FIG. 1B, the lower side between a pair of master girders is constructed such that the child girders are orthogonal to the master girders. The sub girder is a channel material with a U-shaped cross section. The sub-girders are mounted on the lower horizontal pieces in the longitudinal direction of the main girders 2 so as to bridge between the pair of main girders 2, and are fixed to the main girders by welding or the like. The sub-beams 3 are arranged at equal intervals (pitch p) and hold cables (not shown) mounted on the cable rack so as to support them from below.

A large number of embossed portions 5 and 6 are provided on the vertical piece portion 23 of each master beam 2 . The embossed portions 5 and 6 are alternately arranged in a row in the longitudinal direction of the vertical piece portion 23 . The embossed parts 5 and 6 adjacent to each other sandwich one stringer 3, and in FIG. is the embossing portion 6 . The embossed portions 5 and 6 are formed by being embossed from the longitudinal piece portion 23 toward the inner side of the pair of main girders. The embossed portions 5 and 6 are arranged at angles of inclination opposite to each other around a certain stringer 3 between the lower horizontal piece portion 22 and the upper horizontal piece portion 21 so as to form an inverted V shape. It's becoming In other words, a total of two embossed portions 5 and 6 are arranged for one pitch p of the sub-beam 3, and the inclination angle of the embossed portions 5 and 6 is the pitch p. The inclination angle is such that it descends from above each of the adjacent sub-girders 3 toward the middle of the adjacent sub-girders 3 .

FIG. 1F shows the XX section of the embossments 5 and 6. FIG. The embossed portions 5 and 6 are linearly embossed so as to have an arcuate cross section. In this embodiment, the width w of the embossed portions 5 and 6 is w=10 mm, and the height h embossed from the surface of the vertical piece portion 23 is h=2 mm. In addition, the thickness t of the vertical piece portion 23 is t=1.6 mm. The cross sections of the embossed portions 5 and 6 are circular arcs of 110° to 120° in this embodiment. The interval between the lower horizontal piece portion 22 and the upper horizontal piece portion 21 is 100 mm or 150 mm. The length of protrusion of the upper horizontal piece 21 in the width direction of the cable rack 1 is 15 mm, which is greater than the height h of the protrusion.

2A and 2B show the cable rack 1 in this embodiment. In the cable rack 1 shown in FIG. 2A, the inclination of the embossed portion 5 with respect to the longitudinal direction of the vertical piece 23 is 45°, and the inclination of the embossed portion 6 is -45°. Further, in the cable rack 1 shown in FIG. 2B, the inclinations of the embossed portions 5 and 6 with respect to the longitudinal direction of the vertical piece are 60° and −60°. In addition, the inclination of the embossed portions 5 and 6 with respect to the longitudinal direction of the vertical piece portion 23 can be set to 30° and -30°. In the figure, the position of the child girder 3 is indicated by a small square □.

According to the cable rack 1 of the present embodiment, the embossed portions 5 and 6 are provided in a straight line at an angle of inclination that descends toward the center of the adjacent stringer 3, so that dust is less likely to accumulate. Easy to clean. In addition, in the cable rack 1 arranged outdoors, the rainfall and accumulated snow falling on the embossed portions 5 and 6 do not accumulate due to the inclination thereof. In addition, since the embossed portions 5 and 6 are arcuate in shape, an effect can be expected in which dust accumulated by rainfall falls off.

Next, the action of the punching portions 5 and 6 will be described. The cable rack 1 is supported from below at the joints between the cable racks. In FIG. 2, this position is indicated by an equilateral triangle Δ. When a load is applied to the cable rack 1, the center bends downward like a simple beam model supported at both ends.

2C and 2D are comparative examples. In the cable rack 40 of FIG. 2C , each pair of embossed portions 45 and 46 appear as if they were arranged in a row with a certain stringer 3 at the center. In the cable rack 40, the embossed portions 45 and 46 are provided linearly at an angle of inclination that rises around a certain cord 3. As shown in FIG.

In the cable rack 50 of FIG. 2D, the embossed portions 55 and 56 are provided in a straight line inclined in the same direction.

FIG. 2E shows the bending state of the cable rack 1 according to this embodiment when a load is applied. Since the cable is mounted on the girder 3, the load is applied to the position of the girder 3. Dashed lines highlight the deflection. When the main girder 42 bends, the inclination angles of the embossed portions 5 and 6 approach the horizontal (0°), and the geometrical moment of inertia of the main girder 2 increases. That is, it deforms so as to increase its strength against bending.

FIG. 2F shows how the cable rack 40 of the comparative example bends when a load is applied. When the main girder 42 bends, the inclination angles of the embossed portions 45 and 46 increase. Then, the moment of inertia of area of the master girder 42 becomes small. That is, it deforms so that its strength decreases with respect to bending.

FIG. 2F shows how the cable rack 50 of the comparative example bends when a load is applied. When the master girder 52 bends, the inclination angle of one of the embossed portions 55 increases and the inclination angle of the other embossed portion 56 decreases. As a result, a partial difference in strength occurs in the main girder 52 . This will appear as twisting of the cable rack 50 . In this way, in the case of the cable rack 1 of the present embodiment, the embossed portions 5 and 6 have an inclination angle that descends from a certain girder 3 toward the adjacent girder 3. , has the effect of increasing the strength against bending.

FIG. 3 shows a cable rack 1 made according to an embodiment. Comparison between a cable rack 1 with a length of 3m created according to the values shown in column 0017 for the thickness of the iron plate of the main girder 2 and the shape of the hammered portion, and a cable rack without a hammered portion with a thickness of 2.3 mm. bottom. When tested with a load of 980N, the following results were obtained.

No hammered part Iron plate thickness 2.3 mm
Deflection without load = 0.345 mm
Load deflection = 15.228 mm

With embossed parts 5 and 6 Iron plate thickness 1.6mm
Inclination of embossed parts 5, 6 45°, -45° (Fig. 1A)
Deflection without load = 0.074mm
Deflection under load = 2.147 mm

Inclination of embossed parts 5, 6 60°, -60° (Fig. 1B)
Deflection without load = 0.074mm
Deflection under load = 2.181 mm

As the plate thickness increases, the weight of the cable rack increases. In the cable rack without the embossed part, the thickness of the iron plate was thick, so the no-load deflection was large. On the other hand, the deflection when a load was applied was also large. On the other hand, when the embossed portions 5 and 6 are provided, the self-weight of the cable rack can be reduced and the bending can be reduced. The protrusions of the embossing parts 5 and 6 are slight and are provided in an inclined shape, so that dust is less likely to accumulate and cleaning is easy. In addition, even if it is placed outdoors, it is difficult for rainfall and snow to accumulate, and as a result, the weight does not increase and the deflection does not increase. Also, the height h of the embossed portions 5 and 6 is small and arc-shaped. In addition, since the embossed portions 5 and 6 are so small that they can be hidden under the upper horizontal piece portion 21, they are very little exposed to dust, rain, and snow.

Incidentally, it is shown that the cable rack 1 in which the embossed portions 5 and 6 are less inclined has a higher strength against bending. This is probably because the cable rack 1 in which the embossed portions 5 and 6 are less inclined has a larger geometrical moment of inertia of the master girder 42 in the initial stage.

1, 40, 50 Cable rack 2, 42, 52 Master girder 3 Sub girder 5, 6, 45, 46, 55, 56 Strike part 21 Upper horizontal piece 22 Lower horizontal piece 23 Vertical piece

Claims (3)

a pair of parallel master girders having an upper horizontal piece and a lower horizontal piece that protrude inward from the upper and lower ends over the entire length of the horizontally long vertical piece;
a large number of sub-girders mounted and fixed on the lower horizontal piece portion at equal intervals in the length direction of the main girder so as to bridge between the pair of main girder;
A large number of straight punched portions having an arcuate cross section formed by punching out from the vertical piece portion toward the inner side of the pair of master girders,
The plurality of embossed portions are arranged in a row in the length direction of the vertical piece portion and are arranged two by two at intervals of the child girders arranged at equal intervals,
The embossed portions adjacent to each other centering on a certain girder have inclination angles that are opposite to each other between the lower horizontal piece portion and the upper horizontal piece portion, and the inclination angles are equal to the adjacent girder A cable rack characterized by an inclination angle that descends toward the middle of the.
2. A cable rack with a bottom plate according to claim 1, wherein the inward protruding length of said upper horizontal piece is greater than the height of said embossed portion embossed from the surface of said vertical piece.
2. The cable rack according to claim 1, wherein the inclination angles of the two adjacent embossed portions are 45° for one and -45° for the other with respect to the longitudinal direction of the vertical piece. .

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