JP5957431B2 - Cable fire prevention member and fire prevention equipment - Google Patents

Description

  The present invention relates to a cable fire prevention member and fire prevention equipment.

Conventionally, electrical wiring cables are generally required to have a fire prevention function in the event of a fire, but there is no special standard for high fireproof insulation performance. I did not come.
In other words, as a required fire prevention means, for example, when using cables other than non-flammable and flame-retardant cables in a nuclear power plant or the like, it is equivalent to the performance required for those non-flammable and flame-retardant cables. It is a condition that it has been proved by a verification test or the like that it has the above performance, and in this state, only a fire-resistant paint is brushed on the cable (appropriate literature is available by well-known conventional techniques) I can't find it).

  The above-mentioned fire prevention means tends to cause variations in the thickness of the coating film during on-site painting, and it has been difficult to evenly fire the electrical wiring cables.

  Accordingly, an object of the present invention is to eliminate the above-mentioned problems and make it possible to fire the electric wiring cable almost uniformly in the length direction thereof.

  The characteristic configuration of the first cable fire prevention member of the present invention is a cable fire prevention member that is wound around a cable rack that supports an electric wiring cable so as to cover the entire circumference of the cable rack, and is made of a heat-resistant fiber. On both the front and back sides of the fireproof cloth, a foaming agent and reaction catalyst made of ammonium polyphosphate or melamine phosphate, a softening agent made of a plasticizer, a carbonizing agent made of a carbohydrate or a polyhydric alcohol, and a solvent made of xylene A fire-resistant paint layer coated with a fire-resistant paint that reacts by mixing and reacting a solidification reaction accelerator containing a flexible resin material made of urethane-based composite polymer and a solvent made of xylene is attached to the main material containing By the way.

According to the first characteristic configuration of the present invention, the heat-foamable fire-resistant paint mainly composed of a flexible resin loses flexibility as a whole even when applied to a heat-resistant cloth made of heat-resistant fiber. Therefore, it can be easily wound and covered so as to cover the entire circumference of an existing electric wiring cable.
In the event of a fire, the fire-resistant paint layer is foamed by heating to increase the thickness of the electrical wiring cable adjacent to the fire source. Fire spread can be prevented.
In addition, the cable fireproof member in which the fireproof coating is applied to the fireproof cloth can be manufactured in advance in the factory before being wound around the electric wiring cable, and a fireproof paint layer having a uniform coating thickness can be integrally formed on the fireproof cloth. It can be expected that the electrical wiring cable has a uniform and high fire resistance in the length direction.
Therefore, the electrical wiring cable can be protected with good workability.

  By mixing the main material and the solidification reaction promoting material, a flexible fire-resistant paint layer is formed by reacting in a short time, and the fire-resistant member can be quickly formed by laminating and integrating with the fire-resistant cloth. Can be formed. In addition, since a flexible resin material made of a urethane-based composite polymer is used for the fireproof paint, not only the workability is improved by curing in a short time, but the fireproof paint layer formed is Since there is elasticity in addition to flexibility, even if work equipment or workers hit the cable fire prevention member during maintenance, the impact force can be reduced, and it becomes easy to prevent accidents during work as much as possible.

  A second characteristic configuration of the present invention is that the fireproof cloth is formed by weaving a silica fiber yarn.

  According to the second characteristic configuration of the present invention, the fire resistant cloth formed by weaving silica fiber yarn is, for example, more than a fire resistant cloth made by weaving general glass fiber yarn, rock wool, asbestos or the like. Thermal durability, chemical stability, and electrical insulation are high, and fireproof performance can be maintained high.

It is a perspective view which shows the electrical wiring cable supported by the cable rack. It is a perspective view which shows the fire prevention equipment which wound and installed the fire prevention member around the cable rack. It is a longitudinal cross-sectional view of the fire prevention equipment which installed the fire prevention member around the cable rack. It is a longitudinal cross-sectional view of the fire prevention equipment which shows the expansion state of the fire-resistant paint layer accompanying a heating temperature rise. It is a perspective view which shows the fire prevention equipment which wound and installed the fire prevention member of another embodiment around the cable rack. It is a longitudinal cross-sectional view of the fire prevention equipment which installed the fire prevention member of another embodiment around the cable rack. It is a longitudinal cross-sectional view of the fire prevention equipment which shows the expansion state of the fire-resistant paint layer accompanying the heating temperature rising of another embodiment. It is a schematic vertical side view of a test apparatus. It is a temperature change graph of an electric furnace and a heat receiving body.

Embodiments of the present invention will be described below with reference to the drawings.
As shown in FIG. 1, the electrical wiring cable 1 is covered and protected in a refractory and heat-insulated state in the radial direction and the length direction in the existing installation site as well as in the existing installation site. Therefore, as shown in FIG. 2, it can be wound so as to cover the entire circumference along the longitudinal direction of the electric wiring cable 1, and is flexible on at least one side of the front and back of the fireproof cloth 3 made of heat resistant fiber. There is provided a fireproof member provided with a fireproof paint layer 4 coated with a heat-foamable fireproof paint mainly composed of a resin having the following.
As shown in FIGS. 2 and 3, the flexible fireproof member is wound around the entire circumference of the cable rack 2 in a state where the electric wiring cable 1 is supported by the cable rack 2. From the outside of the fire prevention member, a plurality of locations in the longitudinal direction of the cable are wound around a metal strip 5 such as stainless steel in the circumferential direction and tightly bound to constitute a fire prevention equipment.

  The heat-resistant fabric made of heat-resistant fiber 3 is formed by weaving a yarn made of silica fiber having heat resistance up to about 1000 ° C. and having a flame-proofing property. Although there is a flame function, since the heat insulation is low, the fire spreading function for the resin-coated electric wire cable is small, and in order to add the function that the fire resistant cloth 3 lacks, the fire resistant cloth 3 of the fire resistant cloth 3 wound around the cable is added. It is applied so that a fire-proof paint layer comes on one outer side.

The fireproof coating is based on a main material including a foaming agent and a reaction catalyst made of ammonium polyphosphate or melamine phosphate, a softening agent made of a plasticizer, a carbonizing agent made of a carbohydrate or a polyhydric alcohol, and a solvent made of xylene. A solidification reaction accelerator containing a flexible resin material composed of a urethane-based composite polymer and a solvent composed of xylene is mixed and reacted. The fire-resistant paint layer 4 formed of the fire-resistant paint comprises: The two-component mixed spraying of the material and the solidification reaction promoting material enables the finger to be touched after 1 hour, does not dissolve even when water is applied, and after 24 hours, the solidification is completed while maintaining the elasticity. Top coating is possible. Further, the solidified fireproof paint layer 4 becomes 70 (equivalent to a soft ball) by Shore A, and has elasticity and flexibility.
For this reason, the coating film is hardly damaged and can withstand vibration and deformation.

  The fire prevention member may be directly wound around the electric wiring cable 1 so as to be able to prevent fire even in a place where the electric wiring cable 1 is not supported by the cable rack 2.

  Accordingly, the fireproof member wound and fixed around the electric wiring cable 1 supported by the cable rack 2 is carbonized while the foaming agent expands and expands from the state of FIG. 3 to the state of FIG. A layer is formed, and before the temperature rises, the fire-resistant paint layer having a thickness of 0.1 mm is 5 to 10 mm thick, the fire-resistant paint layer having a thickness of 0.5 mm is 50 mm thick, and exhibits fireproof and heat insulation properties. Even if the fireproof time is 60 minutes, the electric wiring cable 1 is kept at a temperature rise of 140 ° C. or less to prevent fire from spreading.

With the test apparatus shown in FIG. 8, the performance of the fire prevention member 7 was tested by reproducing the situation close to the fire prevention equipment of the present invention.
In other words, at the wiring site where a plurality of electrical wiring cables supported by the cable rack are arranged at a certain distance, the fire protection member 7 is covered with each of the cable racks, so that one of the electrical wiring cables rises. When a fire is generated by heating, adjacent electric wiring cables are affected by heat through the fire prevention member 7.
Therefore, in order to investigate the influence of the temperature applied to the adjacent electric wiring cable, a fire-proof member 7 having a fire-resistant paint layer formed on the outer surface of the silica cloth is attached to the entrance of the electric furnace 6, and the distance L from the fire-proof member 7 is adhered. (100 mm) A fireproof member 7 similar to the above as a heat receiving body is pasted at a position away from the heat receiving body, and along with a change curve (curve A, curve B in FIG. 9) of the temperature inside the electric furnace, a change curve of the heat receiving body temperature. A graph is shown in FIG. 9 by measuring (curve A ′, curve B ′ in FIG. 9). In addition, when the electric furnace temperature of the curve A in FIG. 9 is increased (the electric furnace temperature is increased in accordance with the standard heating curve of ISO834 (curve C in FIG. 9)), the heat receiving body (curve A ′) is protected from fire. A fire resistant paint layer having a thickness of 0.5 mm is formed on the side surface of the electric furnace 6 made of silica cloth, and the heat receiving body (curve B ′) is fire-proofed when the electric furnace temperature of the curve B in FIG. The member 7 was formed with a fire resistant paint layer having a thickness of 0.1 mm on the side of the electric furnace of silica cloth.
According to the above test, both the curve A ′ and the curve B ′ of each heat receiving body maintained about 120 ° C. or less (temperature increase of 90 ° C. or less) even after 60 minutes.

[Another embodiment]
Other embodiments will be described below.
<1> The fireproof cloth 3 may be formed of glass fiber, rock wool, alumina fiber, or the like in addition to the silica fiber, as long as they have fire resistance and a flame shielding effect.
<2> The fire resistant paint forming the fire resistant paint layer 4 may use melamine phosphate in addition to ammonium polyphosphate as a foaming agent and a material as a reaction catalyst.
<3> The fire-resistant paint layer 4 may be formed on both the front and back surfaces of the fire-resistant cloth 3 as shown in FIGS. In this case, as shown in FIG. 7, a carbonized layer that expands on both the front and back sides of the refractory cloth 3 is formed by heating and heating, and fireproof performance is improved.
<4> As the fire-resistant paint, the resin material is selected from solvent-based, water-based fire-resistant paint, epoxy, acrylic, vinyl chloride, vinyl acetate / acrylic copolymer resin in addition to the two-component reaction type urethane paint. Can also be used by adjusting the coating thickness.
<5> In order to apply the fire-resistant paint to the fire-resistant cloth, brush coating or spray coating may be applied, and a uniform fire-resistant paint layer may be formed.

  In addition, as mentioned above, although the code | symbol was written in order to make contrast with drawing convenient, this invention is not limited to the structure of an accompanying drawing by this entry. In addition, it goes without saying that the present invention can be carried out in various modes without departing from the gist of the present invention.

1 Electric wiring cable 3 Fireproof cloth 4 Fireproof paint layer

Claims (2)

A cable fire prevention member wound around a cable rack supporting an electric wiring cable so as to cover the entire circumference of the cable rack,
From both sides of the heat-resistant fabric made of heat-resistant fiber, foaming agent and reaction catalyst made of ammonium polyphosphate or melamine phosphate, softener made of plasticizer, carbonizer made of carbohydrate or polyhydric alcohol, and xylene A fire-resistant paint layer in which a fire-resistant paint that reacts by mixing and reacting a solidifying reaction accelerator containing a flexible resin material made of a urethane-based composite polymer and a solvent made of xylene is mixed with a main material containing a solvent made of A cable fire prevention member.   The cable fireproof member according to claim 1, wherein the fireproof cloth is formed by weaving a silica fiber yarn.

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