JPH0453130Y2 - - Google Patents

Description

[Detailed description of the invention] [Purpose of the invention] (Field of industrial application) This invention relates to a fire protection device for attaching a cable rack, and is applied to a cable rack that is suspended by attaching a cable rack hanging fitting to the lower edge. The present invention relates to a fire protection device for attaching a cable rack, which is suitable for protecting cables installed in the cable rack from fire.

(Prior technology) Conventionally, when wiring various cables together in buildings, factories, and other architectural structures, a plurality of child girders were installed at predetermined intervals between a pair of left and right parent girders facing each other. A cable rack is installed in a building structure, and cables are routed and stored within the cable rack.

However, with such a ladder-type cable rack, the cables are exposed between the lower girders, so the cables are not protected from fire in the event of a fire, and the cables may dangle. It was hot and dangerous.

In order to improve these points, cable racks having a cable protection structure have been proposed in Japanese Utility Model Application Publications No. 58-43119, No. 58-159818, No. 59-47216, and Japanese Unexamined Utility Model No. 58-195411. is proposed. The first one covers the top and bottom surfaces of the cable rack with a board and a protection plate, and the second one has a shielding plate attached to the bottom of the lower girder.
In the third type, a shield covering the lower surface is suspended from the upper edge of the main girder via a spring, and in the fourth type, the outside of the cable rack is completely surrounded by a composite sheet.

(Problems to be Solved by the Invention) All of the conventional protective structures as described above have problems in the mounting means of the protective structure itself and in the attachment of cables after mounting.

That is, in the first method, in order to attach the protection plate placed on the lower surface to the fitting groove between the two horizontal protrusions arranged in parallel inside the main girder, the protection plate is installed only when the cable rack itself is assembled. It is difficult to install cables in existing cable racks.

In the second method, even if it is possible to install the cable into an existing cable rack using adhesive means, once it has been applied, it is difficult to remove it. It cannot be used when downward cable branching is required.

Furthermore, because the third type has a suspension structure that utilizes the elastic force of springs, the suspension becomes unstable due to fatigue of the springs after long-term use, and fires have actually occurred. When this happened, the heat caused the springs to stretch, causing them to lose their fire protection ability in a short period of time. In addition, since the cable rack hanging bracket attached to the lower edge of the cable rack for hanging the cable rack from the ceiling etc. cannot be accommodated between the cable rack and the shield, the cable rack hanging bracket is installed. It is difficult to attach the shield to an existing cable rack, and if a cable rack hanging fitting or the like is mistakenly placed between these, a gap will be created and the shield will not be able to prevent flames from entering the cable rack.

The fourth type has a structure in which the outside of the cable rack is completely surrounded by a composite sheet, so if the existing cable rack is suspended from the ceiling etc. using cable rack hanging fittings, the composite sheet It was impossible to install the cable because it got in the way, and the cable rack was unstable because the cable rack was simply hooked with a hanging clip on the upper edge of the cable rack.

Therefore, this idea was devised in view of the conventional circumstances mentioned above, and it can be easily attached to an existing cable rack, especially a cable rack that is suspended by attaching a cable rack hanging bracket to the lower edge. , it is possible to protect the cable from fire, and if necessary, it can be removed and re-branched downward, and it can be firmly attached to the cable rack, making it extremely suitable for disaster prevention.
The purpose of the present invention is to provide a cable rack fire protection device that is attached to a cable rack suspended by hanging fittings.

[Structure of the invention] (Means for solving the problem) In order to achieve the above-mentioned purpose, this invention is based on a cable that is installed and laid on a cable rack that is suspended by attaching a cable rack hanging fitting to the lower end edge. In a fire prevention device for attaching a cable rack to protect a cable rack from fire, a heat-resistant plate is formed to cover the lower surface of a cable rack consisting of a plurality of child girders installed at predetermined intervals between a pair of left and right main girders facing each other, On the lower surface of the heat-resistant plate, a protective plate having an upwardly facing U-shaped cross section is provided in such a way that both release pieces are overlapped so that they can cover the lower side of the main girder with an appropriate interval, and
Both release pieces of this protection plate are formed as bendable plates that can be raised and lowered, and on the other hand, between the heat-resistant plate and the lower surface of the main girder, the cable rack hanging fitting can be accommodated therebetween, and also serves as a heat insulating layer. A spacer that forms a gap is interposed between the spacer, the heat-resistant plate, and the protective plate, and it can be freely attached and detached with a set screw by penetrating the threaded part of the suspension bolt that hangs and hangs from the upper end of the main girder. This is the means to solve the problem.

(Function) According to this invention, the heat-resistant plate placed on the protection plate covers and abuts the lower surface of the cable rack with a spacer interposed therebetween.

These spacers, heat-resistant plates, and protection plates are penetrated by the threaded part of the hanging bolt that hangs down from the upper end of the main girder of the cable rack, and by fixing the set screw to the threaded part, these spacers are removed. , the heat-resistant plate, and the protection plate are removably attached to the cable rack.

At this time, a spacer is interposed between the cable rack and the heat-resistant plate to form a gap that serves as a heat insulating layer, and at the same time, this gap is attached to the lower edge of the cable rack in order to suspend the cable rack itself. This will accommodate the attached cable rack hanging fittings.

Both release pieces formed as bent plates of the protection plate prevent flames from entering from between the heat-resistant plate and the lower surface of the main girder when raised upward, and prevent flames from entering from between the heat-resistant plate and the lower surface of the main girder, and when folded horizontally. increases the shielding area against fire from below and increases the heat shielding effect.

(Example) Hereinafter, an example of this invention will be described in detail with reference to the drawings.

The reference numeral P shown in the figure is a cable rack in which a plurality of child girders are installed at predetermined intervals between a pair of left and right parent girders facing each other. And code 1 is
This is a heat-resistant plate placed on the bottom surface of the cable rack P to protect the cables Q inside the cable rack P from flames in the event of a fire. The material of this heat-resistant plate 1 is planned to be a fire-resistant material such as a calcium silicate plate or other ceramic board, but the material can be selected arbitrarily. The heat-resistant plate 1 is formed to be slightly wider than the width of the cable rack P, and is provided so that both ends of the heat-resistant plate 1 protrude from both sides of the cable rack P.

Reference numeral 2 designates a protection plate on which the heat-resistant plate 1 is placed, and the protection plate 2 is suspended together with the heat-resistant plate 1 from the main girder P1 of the cable rack P using predetermined hanging bolts 4. Therefore, in the illustrated example, bolt insertion holes 2B and bolt insertion holes 1A are bored in the four corners of the plate surfaces of the protection plate 2 and the heat-resistant plate 1, which protrude from both ends of the cable rack P, respectively.
A hanging bolt 4 is inserted through the holder and fixed with a set screw 5. (See Figure 2).

Further, the illustrated protective plate 2 is provided with side plates 2A that can be freely raised and lowered as bending plates on both longitudinal sides thereof. This side plate 2A usually extends upward from the protection plate 2.
It is bent at an angle of 90 degrees to cover the longitudinal side of the heat-resistant plate 1 and the lower side of the main girder P1 of the cable rack P. Also,
By bending this side plate 2A upward from the protection plate 2 at an angle of 45 degrees, it is possible to widen the shielding area against flames from below and enhance the heat shielding effect.

Reference numeral 3 denotes a spacer 3 interposed between the heat-resistant plate 1 and the lower surface of the main girder P1, and similarly to the heat-resistant plate 1 and the protection plate 2, a bolt insertion hole 3B through which the hanging bolt 4 passes is bored. This spacer 3 is interposed between the cable rack P and the heat-resistant plate 1 to form a gap 〓S between them, and the gap 〓S is
As a heat insulating layer that separates the cable rack P and the heat resistant plate 1, it enhances the heat resistance effect of the heat resistant plate 1, and is attached to the lower end of the cable rack P.
It is possible to accommodate a cable rack hanging fitting (not shown) for suspending the cable rack in a predetermined position, so that this invented fire prevention device can be installed without any problem even on a cable rack P with a cable rack hanging fitting attached to the lower end. It is intended to do so.

The spacer 3 shown in FIGS. 1 to 3 is made of a metal material, and has a pair of supporting parts 3A formed by bending the opposite sides of a substantially rectangular metal plate upward. A cable rack P is supported in contact with the upper end of the cable rack P. At this time, the support part 3A
A locking step portion 3C is formed at the upper end to ensure that the cable rack P is supported and fixed by the support portion 3A.

On the other hand, the spacer 3 shown in FIGS. 4 to 6 or 11 to 12 is made of the same material as the heat-resistant plate 1 and has a plate shape having the same length as the width of the heat-resistant plate 1. In particular, it is attached to the joint position of the heat-resistant plate 1. This spacer 3
According to the above, in addition to the function as the spacer 3 described above, it also has a function of heat-resistant protection of the joint portion of the heat-resistant plate 1 where the heat-resistant effect tends to deteriorate.

In addition, it is also possible to use a small piece-shaped spacer 3 made of the same material as the heat-resistant plate 1, such as the spacer 3 shown in FIGS. 7 to 10.
Such a spacer 3 has the advantage that the spacer 3 itself can be made inexpensive.

In addition, these spacers 3 can be used alone or together with the heat-resistant plate 1.
It is also possible to freely combine it with the spacer 3 attached to the joint position.

The suspension bolt 4 is suspended from the upper edge of the main girder P1 of the cable rack P, and is used to attach the protection plate 2, the heat-resistant plate 1, and the spacer 3 to the cable rack P in a state where they are attracted to each other. In the illustrated example, bolts are passed through the bolt insertion holes 2B, 1A, and 3A of the protective plate 2, heat-resistant plate 1, and spacer 3 stacked one after another from above, and then screwed with the set screws 5, and these are screwed into the cable rack P. It is removably suspended from the outer surface of the cable rack P on the upper edge of the main girder P1, and is further attached with a set screw 5.
Tighten. This hanging bolt 4 has a shaft portion 4C
Hook portions 4 that lock onto the upper edge of the main girder P1 are located above and below the
A and a threaded portion 4B for screwing a predetermined set screw 5 on the lower surface of the protection plate 2.
By tightening, the stack of protection plate 2, heat-resistant plate 1, and spacer 3 can be firmly attached, and this attached state remains immovable and extremely stable even against the high heat of earthquakes and fires. are doing.

In FIGS. 7 to 12, a heat-resistant side plate 1B is shown attached to the outer surface of the cable rack P in addition to the heat-resistant plate 1 attached to the lower surface of the cable rack P. That is, a predetermined fixture 6 is attached to the hook portion 4A, and the heat-resistant side plate 1B is attached to the fixture 6.

This fixing fitting 6 is made by drilling two bolt insertion holes 6A in a band-shaped metal plate, inserting the hook portion 4A and the shaft portion 4C of the hanging bolt 4 into the bolt insertion holes 6A, and inserting the hook portion 4A and the shaft portion 4C under the hook portion 4A. The hook portion 4A is locked with the fixing metal fitting 6 interposed between the side edge and the upper end of the cable rack P.

Then, as shown in FIGS. 7 and 8, the outer edge of the fixture 6 is bent and extended to form a locking portion 6B, and the inner side of the locking portion 6B and the side plate 2 of the protection plate 2 are
A heat-resistant side plate 1B is attached and fixed between the inside of A. In this way, by attaching the heat-resistant side plate 1B to the side surface of the cable rack P, not only can the heat-resistant effect of the cable rack P be further enhanced, but also the prescribed fixing metal fittings 6 can be attached to the hook portions 4A of the hanging bolts 4. By attaching the heat-resistant side plate 1B, the heat-resistant side plate 1B can be detachably attached.

Furthermore, in the fixture 6 shown in FIGS. 9 and 10, another hook-shaped locking piece 6C is provided in parallel on the outside of the locking part 6B, and this locking piece 6C and the locking part 6B is removably screwed together with a set screw 6D. And this locking piece 6C
A heat-resistant side plate 1B is sandwiched between the locking portion 6B and the locking portion 6B. In this case, the locking piece 6C by the locking screw 6D
Since it is easy to attach the heat-resistant side plate 1B to the existing cable rack P, it is also easy to attach the heat-resistant side plate 1B to the existing cable rack P.

Furthermore, in FIGS. 11 and 12, two fixing metal fittings 6 are used. That is, the locking portion 6B
A pair of fixing metal fittings 6 formed with a locking piece 6C and a pair of fixing metal fittings 6 formed with a locking piece 6C are formed, and these are overlapped and locked to the hanging bolt 4, and a heat-resistant plate is formed between the locking part 6B and the locking piece 6C. A side plate 1B is sandwiched therebetween. With such two fixing metal fittings 6, it is possible to securely attach the heat-resistant side plate 1B.

Furthermore, when the heat-resistant side plate 1B is attached as shown in the examples shown in FIGS. 7 to 12, a gap is formed between the outer surface of the cable rack P and the heat-resistant side plate 1B. Even if the cable rack hanging fittings (not shown) attached to the lower end of P are approximately L-shaped, the invented fire prevention device can be installed without any trouble because the cable rack hanging fittings are accommodated in this gap. It is possible.

[Effects of the invention] With the above-mentioned configuration, this invention can be installed on any cable rack P, whether it is an existing or a new one, and in particular, a cable rack hanging fitting is attached to the lower edge of the cable rack P. too,
It can be easily attached to the cable rack P, and it not only improves disaster prevention but also improves the appearance when viewed from below.

That is, between the heat-resistant plate 1 and the lower surface of the main girder P1,
A cable rack P is inserted between the spacer 3, the heat-resistant plate 1, and the protection plate 2, with a spacer 3 interposed between them that can accommodate a cable rack hanging fitting and also forms a heat insulating layer. Since the hanging bolt 4, which is hooked and suspended from the upper end of the main girder P1, is removably tightened with the fixing screw 5, it can of course be attached to the existing cable rack P. It can be easily attached to a suspended cable rack P by attaching a cable rack hanging fitting to the lower edge.

Since both release pieces of the protective plate 2 having an upwardly U-shaped cross section are formed as bendable plates that can be raised and lowered, when the bending plate is raised upward, there is a gap between the heat resistant plate 1 and the lower surface of the main girder P1. It is possible to prevent hot air from entering from between S and to increase the heat shielding effect by widening the shielding area against fire from below when it is laid down horizontally.

Moreover, the hanging bolt 4 hung on the upper end of the main girder P1
Since the fixing screw 5 is tightened to the threaded part 4B of the cable rack P, the spacer 3, heat-resistant plate 1, and protection plate 2 are firmly attached to the cable rack P side, so that vibrations such as earthquakes can be avoided. The installation was extremely stable, even against fire and fire.

In addition, since the hanging bolt 4 and the set screw 5 are removably fastened, they can be removed if necessary, for example, to re-branch the cable Q downward or to repair or inspect the inside of the cable rack P. It is easy to do, and the attachment remains strong and will not deteriorate even after re-attachment.

Furthermore, since the heat-resistant plate 1 is superposed on the protective plate 2, damage to the heat-resistant plate 1 is prevented, and even if the heat-resistant plate 1 is damaged, fragments of the heat-resistant plate 1 are prevented from falling.

As described above, according to this invention, even if it is an existing cable rack P, in particular, a cable rack P with a cable rack hanging fitting attached to the lower edge of the cable rack P can be easily installed, and the cable Q can be easily installed. In addition, it can be firmly attached without being affected by vibration or flame, making it extremely suitable for disaster prevention.Furthermore, it is detachable, allowing cables to be rebranched downwards or installed in cable rack P. It has various practical effects such as facilitating repair and inspection.

[Brief explanation of the drawing]

Figures 1 to 6 in the drawings show the first embodiment of this invention, in which Figure 1 is an exploded perspective view, Figure 2 is a sectional view, Figure 3 is a perspective view of main parts, and Figure 4 is an exploded perspective view. Main part perspective view showing the state in which the joint spacer is used, No. 5
The figure is a front view of the main part, FIG. 6 is a sectional view of the main part, and FIGS. 7 to 12 show other embodiments, and FIG. 7 is a perspective view of the main part of the second embodiment. 8 is a sectional view of the main part, FIG. 9 is a perspective view of the main part showing the third embodiment, FIG. 10 is a sectional view of the main part, and FIG. 11 is a perspective view of the main part showing the fourth embodiment. figure,
FIG. 12 is also a sectional view of the main part. P...Cable rack, P1...Main girder, P2...
...Small digit, Q...Cable, 1...Heat-resistant plate, 1A...
...Bolt insertion hole, 1B...Heat-resistant side plate, 2...Protection plate, 2A...Side plate, 2B...Bolt insertion hole, 3...
...Spacer, 3A...Support part, 3B...Bolt insertion hole, 3C...Locking step, 3D...Joint spacer, S...Between, 4...Hanging bolt, 4A...Hook part, 4B... ...Threaded part, 4C...Shaft part, 5...
Fixing screw, 6... Fixing metal fitting, 6A... Bolt insertion hole, 6B... Locking part, 6C... Locking piece, 6D...
Set screw.

Claims (1)

[Scope of utility model registration request] In a cable rack installation fire protection device that protects laid cables from fire by attaching cable rack hanging fittings to the lower edge of the suspended cable rack, a predetermined interval is provided between a pair of opposing left and right master girders. A heat-resistant plate is formed to cover the bottom surface of the cable rack, which is made up of a plurality of sub-girders.
Both of the release pieces are overlapped so as to be able to cover the lower side of the main girder at an appropriate interval, and both of the release pieces of the protection plate are formed as bendable plates that can be raised and lowered, On the other hand, a spacer is interposed between the heat-resistant plate and the lower surface of the main girder to form a space between which the cable rack hanging fitting can be accommodated and which also serves as a heat insulating layer. A fire protection device for attaching a cable rack, characterized in that the protective plate is removably fastened to the protective plate by a set screw that passes through the threaded part of a hanging bolt that hangs and hangs from the upper end of the main girder.