JPH11178147A - Fire-spread preventing sheet and its installation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fire spread preventing sheet and a method for its manufacture wherein the metal base in the fire spread preventing sheet can be grounded with ease and reliability without impairing the advantages of the fire spread preventing sheet. SOLUTION: A fire spread preventing sheet is wrapped around a cable rack 12 with cables 11 installed thereon, and is formed by bonding and laminating onto both the sides of a metal base 1 an insulating inner sheet 2 and an insulating outer sheet 3 which are flame-retardant, fireproof or incombustible and provided with insulating capability. In the fire spread preventing sheet, a metal face 2a is formed on at least part of the inner sheet 2 in contact with the cable rack 12 in order to electrically connect the metal base 1 with the cable rack 12 or a grounding metal wire 14 installed along the cable rack 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fire spread prevention sheet and a construction method thereof, and more particularly to a fire spread prevention sheet wound around a cable rack on which cables are laid and a construction method thereof.

[0002]

2. Description of the Related Art Plastic materials such as polyethylene, cross-linked polyethylene, and vinyl chloride are used for covering materials of cables in order to impart insulation, mechanical properties, and flexibility.

Usually, these cables are laid in multiple layers on a cable rack or the like, and once these cables are ignited, they can refuel each other and spread along the cable line. Are known. In the past, this cable fire has caused great damage and the disruption of power and information has caused great social confusion.

[0004] In recent years, with the development of the information-oriented society and the OA of equipment, the amount of cable used (demand) has been steadily increasing. However, in general, cables are used underground such as underground tunnels and culverts. Since many cases are laid in a closed space, once a fire occurs, it is expected that firefighting activities will be difficult due to smoke and toxic gas. For this reason, especially, in recent years, measures to prevent the spread of cables have become indispensable.

As a measure to prevent the spread of the cable, it is effective to provide a partition wall in the middle of the cable line such as a cave or culvert and to confine the fire spot in a small section.
It is often difficult to construct a bulkhead in a cave or culvert.

For this reason, conventionally, a fire spread paint has been applied to the outer periphery of the cable coating.

[0007] However, although the fire spread paint has a high oxygen blocking effect and has an effect of preventing fire spread, it is difficult to apply the fire spread paint uniformly to the outer periphery of the cable where it cannot be reached. However, there is a problem in that the applied paints adhere and solidify, making it difficult to add or remove cables.

For this reason, recently, a fire spread prevention sheet made of flame-retardant rubber or flame-retardant plastic has been used by being wound around a cable rack on which cables are laid.

The fire spread prevention sheet has the effect of preventing the spread of fire in the same manner as the fire spread prevention paint, the fire spread prevention sheet itself can be easily removed, and the cable can be easily added or removed.

However, in the case of a fire for a long time, the fire spread prevention sheet itself is damaged, and the decomposition gas of the crosslinked polyethylene generated inside the fire spread prevention sheet is damaged by a part of the fire spread prevention sheet or crack. It has been confirmed that it spouts out from the gap of the glass cloth used for the base material and ignites the decomposition gas to cause a spark.

Therefore, it is effective to use a metal substrate as the fire spread prevention sheet so that the decomposition gas does not blow out from the surface of the fire spread prevention sheet even if the decomposition gas of the crosslinked polyethylene is generated.

However, in the case of a fire spread prevention sheet using only a metal base, there is a risk that the cable may be damaged at the end of the metal base or an electrical trouble may occur.
When the metal surface is exposed, heat dissipation from the surface of the fire spread prevention sheet is reduced, and the allowable current reduction rate of the cable may be deteriorated.

[0013] For this reason, a fire spread prevention sheet has been developed in which an insulating sheet having flame retardancy, fire resistance or nonflammability and insulating properties is bonded and laminated on both surfaces of a metal substrate.

[0014]

However, if a trouble occurs in the cable when the above-mentioned fire spread prevention sheet is wound along the cable line while partially wrapping it, the metal base in the fire spread prevention sheet is not used. There is a problem that the electric charge accumulated in the device cannot be dropped to the ground.

For this reason, while measures have been taken to partially peel off the adhesively laminated sheet, to expose the metal base material, and to connect a ground wire to that part, it is easy to remove the fire spread prevention sheet. It is not possible to do so, and it is troublesome to check whether or not the grounding is securely performed, and the user may forget to perform the grounding.

Accordingly, the present invention solves the above-mentioned problems and provides a fire spread prevention sheet which can easily and reliably ground the metal base in the fire spread prevention sheet without impairing the features of the fire spread prevention sheet. It is to provide the construction method.

[0017]

In order to solve the above-mentioned problems, the invention according to claim 1 is wrapped around a cable rack on which cables are laid, and is provided with a flame-retardant or fire-resistant or non-flammable material on both surfaces of a metal base material. And a fire prevention sheet formed by bonding and laminating inner and outer sheets having insulation properties, wherein at least a part of the inner sheet in a portion in contact with the cable rack includes the metal base and the cable rack. Alternatively, a metal surface for electrically connecting a grounding metal wire provided along the cable rack is formed.

The invention according to claim 2 is the fire spread prevention sheet according to claim 1, wherein the metal surface has a cutout for exposing the metal base material on at least a part of the inner sheet. .

According to a third aspect of the present invention, the metal surface is provided on at least a part of the inner sheet with a metal body for connecting the surface of the inner sheet and the metal base material. It is a fire spread prevention sheet.

The invention according to claim 4 is the fire spread prevention sheet according to any one of claims 1 to 3, wherein at least one or more of the metal surfaces are formed along the longitudinal direction and / or the width direction of the inner sheet.

According to a fifth aspect of the present invention, there is provided the fire spread prevention sheet according to any one of the first to fourth aspects, wherein the metal surface is formed on the inner sheet other than the end face of the metal base material and the vicinity thereof.

According to a sixth aspect of the present invention, there is provided a fire spread prevention sheet in which a sheet having a flame retardant property, a fire resistance property or a non-flammability property and an insulating property is adhered on both sides of a metal substrate. In the method for applying a fire spread prevention sheet to be wound around a cable rack in which cables are laid, at least a part of the inner sheet in a portion in contact with the cable rack, along with the metal base and the cable rack or the cable rack. A metal surface for electrically connecting the provided grounding metal wire is formed, and the metal surface is wound inside around the cable rack with the metal surface inside.

According to a seventh aspect of the present invention, after winding around the cable rack with the metal surface inside, a pressing member is arranged around the outer sheet so that the metal surface is connected to the cable rack or the ground. 7. The method for applying a fire spread prevention sheet according to claim 6, wherein the sheet is forcibly brought into contact with a metal wire.

According to the above construction, the inner and outer surfaces are wound around the cable rack on which the cables are laid, and have a flame-retardant or fire-resistant or non-flammable property on both sides of the metal base material, and also have an insulating property. In a fire spread prevention sheet formed by bonding and laminating an outer sheet, at least a part of the inner sheet at a portion in contact with the cable rack, the metal base and the metal wire for grounding provided along the cable rack or the cable rack. A fire prevention sheet that can easily and reliably ground the metal substrate in the fire spread prevention sheet without damaging the features of the fire spread prevention sheet because a metal surface for electrically connecting the fire spread sheet is formed. Can be obtained.

[0025]

Embodiments of the present invention will be described below.

FIG. 1 shows a plan view and a sectional view of the fire spread prevention sheet of the present invention. FIG. 1A shows a plan view, and FIG.
FIG. 2B is a sectional view taken along the line AA of FIG.

As shown in FIGS. 1 (a) and 1 (b), the fire spread prevention sheet 4 of the present invention has flame retardancy or fire resistance or non-flammability, and has insulation properties. Having an inner sheet 2 adhered to one surface of the metal substrate 1 and an outer sheet 3 adhered to the other surface of the metal substrate 1, inside of a portion in contact with a cable rack (not shown). A cutout (metal surface) 2a is formed in at least a part of the sheet 2 so as to electrically connect the metal substrate 1 and a cable rack or a grounding metal wire provided along the cable rack. .

As the material of the metal substrate 1, Al, Cu,
Fe, stainless steel, and the like are generally used, but are not particularly limited as long as they are nonflammable and do not allow the decomposition gas of crosslinked polyethylene to pass therethrough.

Examples of the shape of the metal substrate 1 include a thin plate, a foil, and a net. The thickness of the metal substrate 1 varies depending on the material of the metal substrate 1. 10 μm to 1 mm, preferably 20 to 100 μm.

The material of the inner sheet 2 and the outer sheet 3 is not particularly limited as long as it is flexible and can prevent the spread of fire. For example, a rubber or plastic sheet material, Examples include paint-like materials, incombustible fibers or composite materials based on the same.

The thickness of the inner sheet 2 depends on the shape of the notch 2a, but is not particularly limited as long as the metal base 1 and the cable rack can be electrically connected. Instead, for example, 20-500μ
m is preferred.

The thickness of the outer sheet 3 is not particularly limited, and is preferably, for example, 20 μm to 2 mm.

The material of the adhesive layer of the inner sheet 2 and the outer sheet 3 is not particularly limited as long as it is flame-retardant or non-flammable and can bond the metal substrate 1 to each of the sheets 2 and 3. It is not necessary to use a flame-retardant or non-flammable material as long as it does not hinder the spread of fire.

The shape of the cutout portion 2a in the inner sheet 2 is not particularly limited, such as a slit shape (band shape), a square shape, and a round shape. When the shape of the notch 2a is, for example, a slit, the width is preferably 5 mm or more.

At least one notch 2a is formed along the longitudinal direction and / or the width direction of the inner sheet 2,
The plurality of cutouts 2a may be assembled to form a partially exposed portion of the metal base 1, and if there is no risk of electrical trouble occurring in the cable, the end surface (end) of the metal base 1 and its vicinity A portion other than the portion may be exposed from the inner sheet 2. In this case, the bonding width between the inner sheet 2 and the end face of the metal base 1 and the vicinity thereof is preferably 5 mm or more.

The material of the cable rack is not particularly limited, and may be metal or nonmetal (for example, hard plastic).

The material of the grounding metal wire is not particularly limited, and examples thereof include a copper stranded wire.

The grounding metal wire is used when a non-conductive coating is applied to a metal cable rack or when a non-metal cable rack is used, and a bare metal cable rack is used. It is needless to say that there is no particular necessity when using. Further, in the present invention, the notch 2a is formed after the inner sheet 2 is bonded and laminated on the metal base 1, but the inner sheet 2 in which the notch 2a is formed in advance is replaced with the metal base 1. Needless to say, it may be adhered and laminated.

That is, according to the fire spread prevention sheet of the present invention, a cutout for exposing the metal base material is formed in the inner sheet of the fire spread prevention sheet in advance, and the cutout is formed at the grounding portion of the metal base work. This eliminates the need to separate the sheet (outer sheet) after winding the fire spread sheet around a cable rack, etc., and connecting the ground wire to that part, making it easier to attach the fire spread sheet. become.

Next, the construction method of the present invention will be described.

FIG. 2 is a perspective view showing a state in which the fire spread prevention sheet of the present invention is wound around a cable rack.

As shown in FIG. 2, the fire spread sheet 4 shown in FIG. 1 is wound around the cable rack 12 on which the cable 11 is laid with the inner sheet 2 facing the cable rack 12.

The fire spread sheet 4 is wound around the cable rack 12 with the inner sheet 2 facing the cable rack 12, so that the metal base 1 exposed from the cutout 2 a of the inner sheet 2 can be securely connected to the cable rack 12 or the cable rack 12. The grounding metal wire 14 provided along 12 is grounded.

At this time, the outer sheet 3 of the fire spread prevention sheet 4
A band (pressing member) 13 is arranged in a portion corresponding to the notch 2a in the above, and the metal base 1 and the cable rack 12 or the metal for grounding exposed from the inner sheet 2 in the fire spread sheet 4 are tightened. The wires 14 are forcibly brought into contact with each other, and the metal base 1 is more reliably grounded to the cable rack 12 or the grounding metal wires 14.

The band 13 is substantially fitted to the cutout portion 2a on the fire spread prevention sheet side in order to further improve the contact between the metal base 1 exposed from the inner sheet 2 and the cable rack 12 or the grounding metal wire 14. Projections may be formed.

That is, according to the method for constructing a fire spread prevention sheet of the present invention, a fire spread prevention sheet in which a cut-out portion serving as a grounding point of a metal base material is formed in advance on the inner sheet is wound around the inner sheet with the cable rack side. Therefore, even if a plurality of fire spread prevention sheets are used and the construction length is increased while wrapping the width direction end of the fire spread prevention sheet, each fire spread Simply winding the prevention sheet around the cable rack can easily and reliably ground the metal base of each fire spread prevention sheet.

Further, since the grounding of the metal substrate in the fire spread prevention sheet is performed only by winding the fire spread prevention sheet without connecting the ground wire to the fire spread prevention sheet, the fire spread prevention sheet is easily detachable. Does not impair.

Next, another embodiment of the present invention will be described.

In the present invention, the metal surface is formed by forming a cutout 2 a in at least a part of the inner sheet 2 to expose the metal base 1.

On the other hand, the metal surface in another embodiment is such that a metal body for connecting the surface of the inner sheet 2 and the metal substrate 1 is provided on at least a part of the inner sheet 2. is there. Here, the shape of the metal body is not particularly limited as long as one end thereof penetrates the inner sheet and is embedded in the metal base material and the other end faces the surface of the inner sheet 2. For example, a rod shape, a protrusion shape, or the like can be given.

In this embodiment, it is needless to say that the same operation and effect as those of the present invention can be obtained, and a more reliable grounding effect can be obtained.

[0052]

In summary, according to the present invention, a cutout for exposing the metal base is formed in the inner sheet of the fire spread prevention sheet in advance, and this cutout is used as a grounding point of the metal base. By winding the fire spread prevention sheet around a cable rack etc., the sheet is partially peeled off,
The work of connecting the ground wire to that part becomes unnecessary,
It has an excellent effect that the work of attaching the fire spread prevention sheet is simplified.

[Brief description of the drawings]

FIG. 1 is a plan view and a sectional view of a fire spread prevention sheet of the present invention.

FIG. 2 is a perspective view showing a state in which the fire spread prevention sheet of the present invention is wound around a cable rack.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Metal base material 2 Inner sheet 2a Notch (metal surface) 3 Outer sheet 4 Fire spread prevention sheet 11 Cable 12 Cable rack 13 Band (pressing member) 14 Metal wire for grounding

Claims (7)

[Claims] 1. An inner and outer sheet which is wound around a cable rack on which a cable is laid and which has flame retardancy, fire resistance or non-flammability, and has insulation properties on both surfaces of a metal substrate. In the fire spread prevention sheet, the metal base and the grounding metal wire provided along the cable rack or the cable rack are electrically connected to at least a part of the inner sheet in a portion in contact with the cable rack. A fire spread prevention sheet having a metal surface for connection. 2. The fire spread prevention sheet according to claim 1, wherein the metal surface has a cutout for exposing the metal base material on at least a part of the inner sheet. 3. The fire spread prevention sheet according to claim 1, wherein the metal surface is provided on at least a part of the inner sheet with a metal body for connecting the surface of the inner sheet and the metal base material. 4. The fire spread prevention sheet according to claim 1, wherein at least one metal surface is formed along a longitudinal direction and / or a width direction of the inner sheet. 5. The metal sheet is formed on the inner sheet other than the end face of the metal base and a portion near the end face.
The fire spread prevention sheet according to claim 4. 6. A cable for laying a fire-prevention sheet on both sides of a metal substrate, which is a fire-retardant sheet made of a flame-retardant, fire-resistant, or non-flammable, and insulative sheet bonded inside and outside. In the method for applying a fire spread prevention sheet to be wound around a cable rack, the metal base and the cable rack or a grounding ground provided along the cable rack are provided on at least a part of the inner sheet in a portion in contact with the cable rack. A method for applying a fire spread prevention sheet, comprising forming a metal surface for electrically connecting a metal wire, and winding the metal surface around the cable rack with the metal surface inside. 7. After winding around the cable rack with the metal surface facing inward, a pressing member is disposed around the outer sheet to force the metal surface to the cable rack or the grounding metal wire. The method for constructing a fire spread prevention sheet according to claim 6, wherein the sheet is brought into contact with the sheet.