JP6626080B2 - Cable fire insulation - Google Patents

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cable fire-resistant and heat-insulating apparatus in which an electric wiring cable is placed on a metal cable rack and the electric wiring cable is covered with a fire-resistant and heat-insulating layer along the longitudinal direction.

2. Description of the Related Art Conventionally, there is a device in which an electric wiring cable on a cable rack is covered with a sheet metal casing provided with a heat insulating material layer inside, and the outer surface of the casing is covered with a fire-resistant paint layer ( For example, refer to Patent Literature 1) In addition to the heat insulating performance of the heat insulating material layer, the fire resistant paint layer foams to form a heat insulating layer at the time of a fire, and a fire resistant paint layer covering the outer surface of the casing. Have a problem that they fall off due to foaming caused by a fire.
Therefore, a fire-resistant heat-insulating layer in which a foaming layer that forms a heat-insulating layer by foaming with an increase in temperature is laminated between a first inorganic heat-insulating material layer made of a fiber material and a second inorganic heat-insulating material layer in the thickness direction thereof. Thus, there has been proposed a cable fireproof and heat insulating device that covers an electric wiring cable in the longitudinal direction and covers the fireproof and heat insulating layer with a protective layer made of glass cloth with aluminum foil and a reinforcing material made of a metal net, a metal band, and the like (for example, , Patent Document 2).

JP-A-2005-33172 JP-A-2006-220408

  The above-mentioned cable fire-resistant insulation device supports the electric wiring cables on the cable rack, but when the load is supported by a wire mesh or metal band, the fire-resistant insulation layer on the inside is soft, so the fire-resistant insulation layer is compressed and deformed. The heat insulation performance of the heat insulation layer is reduced.In addition, the aluminum foil glass cloth is vulnerable to fire in the event of a fire. There is a problem that it is weak to impact force.

  Accordingly, an object of the present invention is to solve the above-mentioned problems, to provide a cable with a high strength against external force as a whole, and to maintain a high fire and heat insulation performance even when supporting an electric wiring cable from the outside via a casing. To provide

  A first characteristic configuration of the present invention is a cable fire-resistant and heat-insulating device in which an electric wiring cable is placed on a metal cable rack and the electric wiring cable is covered with a fire-resistant insulating layer along a longitudinal direction thereof. Forming the fire-resistant heat-insulating layer on the outside of the electric wiring cable on a metal cable rack with a cotton-like or mat-like first inorganic heat-insulating layer made of a fiber material; Outside the heat insulating material layer, it is covered with a plate-like inorganic heat insulating molded body layer made of an inorganic heat insulating material, and outside the inorganic heat insulating molded body layer, a cotton-like or mat-shaped second inorganic heat insulating material layer made of a fiber material Outside the second inorganic heat-insulating material layer and covered with a sheet metal metal casing having an inner surface coated with a foaming refractory paint along the longitudinal direction of the electric wiring cable.

According to the first characteristic configuration of the present invention, the outside of the electric wiring cable on the metal cable rack is covered with the cotton-like or mat-like first inorganic heat insulating material layer made of a fiber material, so that the electric wiring cable Even if the receiving metal cable rack has projections and projections such as connecting bolts, the first inorganic heat insulating material in the form of cotton or mat deforms and absorbs in correspondence with the projections and projections, and (1) By covering the outside of the inorganic heat-insulating material layer with a plate-shaped inorganic heat-insulating material layer made of an inorganic heat-insulating material, in addition to the heat insulation performance of the inorganic heat-insulating material, the inorganic heat-insulating formed material layer becomes a first inorganic heat-insulating material layer Because of its stiffer shape and retaining shape, it can be transmitted to the metal casing without deformation even under the load of the electric wiring cable. Load bearing with casing made of It can be.
In addition, even if an external force acts during transportation or construction, the metal casing is hardly deformed, and the heat insulating material and the electric wiring cable inside the casing can be protected without being damaged.

In addition, the metal casing completely blocks the flame generated by the fire and protects the refractory heat-insulating layer inside the metal casing, and furthermore, covers the outside of the inorganic heat-insulating molded body layer with the second inorganic heat-insulating material layer. Since the inner surface of the metal casing is covered with the foaming refractory paint, even if the metal casing is thermally expanded due to a rise in temperature due to a fire, the casing formed with the thermal expansion and the second inorganic heat insulating material layer The foamed refractory paint applied to the inner surface of the metal casing is filled with foam to form a thicker heat insulating layer.
Moreover, even if the foaming phenomenon of the foamable refractory paint foams larger than the gap between the casing and the second inorganic heat-insulating material layer, the foaming is performed by the resilient cotton-like or mat-like second inorganic heat-insulating material. The layers allow the fire protection performance as a whole to be high.

  A second characteristic configuration of the present invention is that the metal casing includes a pair of split casings formed in a radial direction of the cable, and the pair of split casings are formed so as to be connectable and separable from each other. The foamed refractory paint is applied to the butt connection between the divided casings.

According to the second feature configuration of the present invention, in addition to achieving the above-described operation and effect of the first feature configuration of the present invention, the metal casing is provided with a pair of cables divided and formed in the radial direction of the cable. By forming the pair of split casings so as to be connectable and separable from each other, the pair of split casings can be easily separated at any time and the state of the electric wiring cable can be grasped. Easy maintenance. In addition, by applying the foaming refractory paint to the butt connection between the pair of split casings, even if a gap is formed in the butt connection due to the thermal expansion of the casing, the foaming refractory paint foams. To fill the gap.
Therefore, it is possible to maintain high fire insulation performance while improving maintainability of the cable.

  According to a third characteristic configuration of the present invention, the fibrous material forming the first inorganic heat insulating material layer and the second inorganic heat insulating material layer is a biosoluble fiber made of silica, calcia, and magnesia, The inorganic heat insulating material forming the body layer is formed by adding an inorganic binder and an organic binder to a biosoluble fiber made of silica, calcia, and magnesia.

According to the third characteristic configuration of the present invention, the first inorganic heat-insulating material layer and the second inorganic heat-insulating material layer formed of the biosoluble fiber, and the inorganic heat-insulating molded body layer, when the fiber material during the construction, Even if it enters the body, it can be prevented from dissolving in the living body and damaging health.
Therefore, it is possible to provide a highly safe cable fire and heat insulating device.

It is sectional drawing of a cable fire insulation apparatus. 5 is a change graph showing the fire resistance performance of the present invention. 5 is a change graph showing fire resistance performance of a comparative example.

Embodiments of the present invention will be described below with reference to the drawings.
As shown in FIG. 1, especially at the installation site of the electric distribution cable 1, the electric distribution cable 1 is attached to a metal cable rack 2 in order to protect the electric distribution cable 1 by fire-resistant insulation in the radial direction and the length direction. The electric wiring cable 1 is covered with a refractory electric heating layer 3 along the longitudinal direction in a state where the electric wiring cable 1 is placed, and the electric wiring cable on the metal cable rack 2 is formed to form the refractory electric heating layer 3. 1 is covered with a cotton-like or mat-like first inorganic heat-insulating material layer 4 having a thickness of 13 mm made of a fibrous material. Outside the first inorganic heat-insulating material layer 4, a plate-like 75 mm-thick inorganic heat-insulating material is provided. A thick 13 mm thick second inorganic heat insulating material layer 6 made of a fibrous material on the outside of the inorganic heat insulating molded material layer 5, Of the second inorganic heat insulating material layer 6 On the side, to provide a cable fire insulating device covering along the longitudinal direction of the sheet metal made of metal casing 8 coated foam refractory coating 7 of 3mm thick on the inner surface electric wiring cables 1.
In the figure, reference numeral 11 denotes a stud pin for holding the inorganic heat-insulating molded body layer 5 and the second inorganic heat-insulating material layer 6 in the metal casing 8.

The metal casing 8 is made of a stainless steel plate having a thickness of 0.6 mm and is composed of a pair of divided casings 8A divided in the radial direction of the electric wiring cable 1, and these paired divided casings 8A are formed so as to be connected and separated from each other. The butt connecting portion 9 of the pair of divided casings 8A is formed of a flange portion, and is configured to be connected and separated from each other by a bolt and nut device 10.
The foaming refractory paint 7 is applied between the butting surfaces of the flange portions.

  The fiber material forming the first inorganic heat insulating material layer 4 and the second inorganic heat insulating material layer 6 is a biosoluble fiber made of silica, calcia, and magnesia, and the inorganic heat insulating material forming the inorganic heat insulating molded body layer 5 Is formed by adding an inorganic binder and an organic binder to a biosoluble fiber composed of silica, calcia, and magnesia.

  The foamable refractory paint layer mainly contains 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 carbohydrate or polyhydric alcohol, and a solvent made of xylene. A foaming refractory paint 7 is applied to the material by mixing and reacting a solidification reaction accelerator containing a flexible resin material made of a urethane-based composite polymer and a solvent made of xylene.

The foamable refractory paint layer formed by the foamable refractory paint 7 can be touched after 1 hour by two-component mixing spraying of the main material and the solidification reaction promoting material, and does not dissolve even when water is applied. After 24 hours, the solidification is completed while maintaining the elasticity, so that transport and top coating can be performed. Moreover, the solidified foaming refractory paint 7 has elasticity and flexibility.
Therefore, the coating film is hardly damaged, and can withstand vibration and deformation.
The foaming refractory paint layer coated with the foaming refractory paint 7 maintains a stable coating film at room temperature and foams by heating to form a dense carbonized heat insulating layer.

[Experimental example]
Next, the results of experimentally confirming the difference in fire insulation performance between the cable fire insulation device of the present invention and a comparative example in which the foam fireproof coating layer is not provided for the cable fire insulation device are shown below. Shown in a change graph.
FIG. 2 is a graph showing a change in heat-resistant temperature by the cable fire-resistant insulation device of the present invention, and FIG. 3 is a graph showing a change in heat-resistant temperature of a comparative example.
However, the target value of the space temperature for raising the temperature was set at an ambient temperature of + 139 ° C. and a maximum of an ambient temperature of + 181 ° C. or less (the ambient temperature was 10 ° C. to 40 ° C.).
According to the above experimental results, the temperature in the cable holding space of the present invention at the ambient temperature of 27.6 ° C. reached the maximum temperature of 108.8 ° C. (allowable temperature of 166.6 ° C.) after 180 minutes of heating. (FIG. 2) In the comparative example, after 180 minutes at an ambient temperature of 31.8 ° C., the temperature in the cable holding space becomes 119.6 ° C. (allowable temperature: 170.8 ° C.), and the inner surface of the metal casing 8 It is clear that the foamable refractory paint layer 7 has more heat insulation.

  Note that, as described above, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration of the attached drawings by the entry. Further, it goes without saying that the present invention can be implemented in various modes without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 1 Electric wiring cable 2 Metal cable rack 3 Fireproof heat insulation layer 4 1st inorganic heat insulation material layer 5 Inorganic heat insulation molding layer 6 2nd inorganic heat insulation material layer 7 Foamable fireproof paint 8 Metal casing 8A Split casing 9 Butt connection part

Claims (3)

In a state in which the electric wiring cable is placed on a metal cable rack, the cable and the heat insulating apparatus are covered with a fire insulating layer along the longitudinal direction of the electric wiring cable,
To form the refractory insulation layer,
Outside of the electrical distribution cable on a metal cable rack, covered with a cotton-like or mat-like first inorganic heat insulating layer made of a fiber material;
Outside the first inorganic heat insulating material layer is covered with a plate-shaped inorganic heat insulating molded body layer made of an inorganic heat insulating material,
On the outside of the inorganic heat-insulating molded body layer, it is covered with a second inorganic heat-insulating material layer made of a fibrous material in the form of cotton or mat,
A cable fire-resistant and heat-insulating device, which is covered along the longitudinal direction of the electric wiring cable with a metal casing made of sheet metal having an inner surface coated with a foamable fire-resistant paint outside the second inorganic heat-insulating material layer. The metal casing is composed of a pair of split casings formed in the radial direction of the cable,
The pair of split casings are formed so that they can be connected and separated from each other,
2. The cable fire-resistant insulation device according to claim 1, wherein a foamable fire-resistant paint is applied to a butt connection between the pair of split casings. 3. The fiber material forming the first inorganic heat insulating material layer and the second inorganic heat insulating material layer is a biosoluble fiber made of silica, calcia, and magnesia,
The cable according to claim 1 or 2, wherein the inorganic heat-insulating material forming the inorganic heat-insulating molded body layer is formed by adding an inorganic binder and an organic binder to biosoluble fibers made of silica, calcia, and magnesia. apparatus.

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