JPH084449A - Heat insulating slat - Google Patents

Abstract

PURPOSE:To effectively suppress the temperature rise of a slat at the time of a fire. CONSTITUTION:A space for accommodating a closed bag 4 is formed between a slat 1 and a keep plate 2, and an engaging part engaged with the other slat, with the vertical ends bent is formed. The keep plate 2 is provided with numerous through holes 5 on the whole surface by punching. The closed bag 4 is manufactured out of synthetic resin with a low fusing point, and water absorbing material containing water is filled in the closed bag 4. When the slat 1 is exposed to a fire, the part, being in contact with the slat 1, of the closed bag 4 is softened of melts, and the closed bag 4 is destroyed. Water contained in the water absorbing material is evaporated, and water vapor is discharged outside from through holes 5 so as to prevent the rise of water vapor pressure. With this water evaporation, the temperature rise of the slat is moderated so as to be able to suppress radiant heat released to the back face side of the slat.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slat of a shutter, and more particularly to a slat of a fireproof shutter.

[0002]

2. Description of the Related Art As a material for a slat type shutter used as a fire door, metal such as iron or stainless is suitable. Article 110 of the Enforcement Ordinance of the Building Standards Act defines Class A fire doors and Class O fire doors as fire doors, and in the case of using an iron plate, the class A fire doors have an iron frame with a thickness of 0. A steel plate with a thickness of 5 mm or more, or an iron plate with a thickness of 1.5 mm or more, and a type B fire door made of iron with a thickness of 0.8 mm or more
It is less than 5 mm. From the perspective of fire spread prevention and fire protection divisions, it is obligatory to install fire doors at openings and entrances.

For example, when a slat type shutter using an iron plate is installed in an opening or an entrance of a building and a fire occurs, the fire doors installed in the opening or the entrance are closed. It is possible to suppress the spread of fire to the adjacent portion through the opening, the entrance and the like.

However, as a result of studying an actual fire situation, it was found that even a fire door that satisfies the above-mentioned conditions is not enough to stop the spread of fire in the case of the slat type shutter. That is, when a fire occurs in the front part of the shutter, the temperature of the front of the shutter rises due to the flames or radiant heat of the slat of the shutter, the temperature rise is transmitted to the rear surface, and the radiant heat is radiated from the rear surface. Therefore, there is a problem in that the adjacent portions are heated to a high temperature and some objects placed in the adjacent portions are ignited by radiant heat. Further, if the slats are integrated on the front and back sides, the temperature on the fire side, which is the front side, rises first and stretches. Since the linear expansion coefficient of iron is 0.138 × 10 ⁻⁴ / ° K, a temperature rise of 1000 ° C. results in an elongation of 13.8 mm per 1 m. Therefore, while the temperature on the surface on the anti-fire side does not rise rapidly, the expansion on that surface is small, so the slats may bend greatly on the fire side due to the difference in the amount of expansion, and the slats may come off the rails. It may have caused a fire to spread. Further, if the thickness of the iron plate is increased, the weight of the shutter also increases.

[0005] In response to this, actual Kaihei 1-171893
In the shutter slat described in the publication, a refractory case filled with a polymeric water absorbing material that absorbs water is formed along the back surface side of the slat body. The heating temperature of the slat is the boiling point of water until the heat of the slat body and the refractory case is absorbed by the water and the water evaporates and disappears.
It can be maintained below 0 ° C. It is stated that the polymeric water-absorbent material should be directly filled in a fireproof case, or enclosed in an airtight bag such as aluminum foil to facilitate the filling work and completely prevent natural evaporation. ing.

Therefore, the refractory case in the slats described in the above publications can be directly filled with a polymeric water-absorbing material to suppress natural evaporation, so that a close sealed state is used. . In order to completely prevent the natural evaporation, it can be said that it is considered to be enclosed in a closed bag.

As described above, in the case of using the heat of vaporization of water to suppress the temperature rise, the temperature rise cannot be suppressed if there is a factor that hinders the vaporization. Since the fireproof case is close to a sealed state, if the temperature rises rapidly due to a fire, the vaporized water vapor cannot flow out of the fireproof case immediately, the water vapor pressure inside the fireproof case increases, and the boiling point of water rises. It rises and the temperature drop due to evaporation is not sufficient. However, if the refractory case is made to communicate with the outside air sufficiently, there is a problem that water is reduced by natural evaporation. Also, if it is enclosed in a sealed bag such as aluminum foil, the sealed bag is protected by the fireproof case,
There is a problem that the sealed bag cannot be broken unless the vapor pressure of the vaporized water becomes considerably high. As described above, even if the airtight bag is broken, it is not enough to release water vapor from the fireproof case to the outside. Even if the shutter slat described in the above publication is used, the temperature rise in the event of a fire is sufficiently suppressed. Is difficult.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and provides a heat shield slat capable of effectively suppressing a temperature rise on the anti-fire surface side of a slat in the event of a fire. The purpose is to do.

[0009]

According to a first aspect of the present invention, in a heat shield slat, a holding plate having a large number of through holes provided at intervals on the back surface side of the slat. And a water-absorbing material containing water filled in a sealed bag of an impermeable resin that is held between the slat and the pressing plate and is thermally destroyed.

The invention according to claim 2 is the heat-insulating slat according to claim 1, characterized in that the water absorbing material is supported by a non-combustible or flame-retardant fibrous substance. is there.

According to a third aspect of the present invention, the heat shield slat according to the first or second aspect is characterized in that a heat insulating material is interposed between the slat and the closed bag. .

[0012]

According to the present invention, since the water-absorbing material containing water is filled in the airtight bag made of water-impermeable resin, it is possible to prevent water from spontaneously evaporating and the airtight bag is thermally destroyed. Does not prevent evaporation of water in case of fire. Furthermore, since a large number of through holes are formed in the pressing plate that supports the closed bag, the vaporized water vapor can be easily discharged to the outside, and the water vapor pressure is not increased.

Further, by supporting the water-absorbent material with a non-combustible or flame-retardant fibrous substance, the water-absorbent material does not adhere to all of the through holes and prevents escape of water vapor to the outside. There is no.

Further, since the heat insulating material is interposed between the slat and the closed bag, the closed bag receives heat through the heat insulating material, so that heat transfer during a fire can be further suppressed.

[0015]

1 is a sectional view of a heat shield slat for explaining an embodiment of the present invention. In the figure, 1 is a slat plate,
2 is a pressing plate, 3 is a water absorbing material, 4 is a closed bag, and 5 is a through hole. In this example, as the material of the slat plate 1, a stainless plate having a thermal conductivity worse than that of iron was used. Of course, a steel plate may be used. The material of the pressing plate 2 is also a stainless plate, but the plate thickness may be smaller than that of the slat plate 1. A large number of through holes 5 are provided on the entire surface of the pressing plate 2 by punching, and the upper and lower parts thereof extend to the engaging portion formed by bending the upper and lower sides of the slat plate 1 in this embodiment, Although molded together, other constructions may be employed. As the water absorbing material, an appropriate material such as a water absorbing polymer or a sponge-like porous material can be used.

For the sealed bag 4, synthetic resin having a low melting point is suitable. For example, polyethylene is a material having low heat resistance, and in particular, low density polyethylene has only heat resistance of about 82 to 100 ° C. When the slat plate 1 is exposed to a fire and its temperature rises sharply, the sealing bag 4 made of synthetic resin having low heat resistance softens or melts at the portion in contact with the slat plate 1 as described above. Or Even in the softened state,
The closed bag 4 is destroyed by the water vapor pressure of the water contained in the water absorbent material. Even on the side of the holding plate 2, the slat plate 1
The sealed bag 4 is heated by the heat conducted from the sealed bag 4, and if the temperature rise is large, the sealed bag 4 is heated. By heating, the airtight bag 4 is melted and directly destroyed, or
Even in the softened state, indirect thermal destruction occurs with the help of water vapor pressure. On the other hand, the water contained in the water absorbing material evaporates due to heat, and the temperature rise of the slats is moderated by this evaporation, and the radiant heat released to the back surface side of the slats can be suppressed. The vaporized water vapor is prevented from being released to the outside through the through holes 5 around the heat-destructed closed bag 4 and increasing the water vapor pressure.

An example of a method for manufacturing the above-mentioned slats will be described with reference to FIG. In the figure, the same parts as those in FIG. As shown in the figure, a slat plate 1 and a pressing plate 2 having a through hole 5 are formed into a Z shape, and a sealed bag 4 containing a water absorbing material 3 containing water on one plate. Place it on top of the other plate and align it with the other plate. Then, the upper and lower ends are bent together to form an engaging portion. The left and right ends of the slats may be left as they are, may be crushed, or may be appropriately covered.

According to the above-mentioned manufacturing method, in the step of forming the slats, the closed bag filled with the water absorbing material is stored. However, after attaching the pressing plate 2 to the slat plate 1, the water absorbing material is opened from one of the left and right openings. A filled sealed bag may be inserted.
The pressing plate 2 may be attached by a joining method such as spot welding.

It is not necessary to form one closed bag, but a plurality of elongated bags may be used. As a method of inserting the closed bag after fixing the pressing plate to the slat plate, a method of inserting the long closed bag while pulling it with a guide wire or the like is suitable.

FIG. 3 is a sectional view of a heat shield slat for explaining another embodiment of the present invention. In the figure, the same parts as those in FIG. 6 is a heat insulating material. In this embodiment, the heat insulating material 6 is provided over the entire surface of the slat plate including the upper and lower engaging portions of the slat.
Therefore, the heat insulating material 6 is also interposed between the slat plate 1 and the closed bag 4. As the heat insulating material 6, ceramic non-woven fabric, glass wool non-woven fabric, rock wool non-woven fabric and the like are suitable, but other non-combustible and flame-retardant materials can be used. When the engaging portion is formed by bending a stainless steel plate or the like as in this embodiment, the heat insulating material 6 is preferably a flexible material. In manufacturing, the heat insulating material 6 is attached to the slat plate 1
After being adhered to, the slat of the example can be manufactured by the method described in FIG.

In this embodiment, the heat bridge can be avoided by providing the heat insulating material on the entire surface of the slat plate. Furthermore, since the airtight bag receives heat via the heat insulating material, heat transfer during a fire can be extremely suppressed, and heat radiation to the anti-fire side can be suppressed for a longer time. When the heat bridge is not a problem, the heat insulating material may be arranged only near the closed bag.

A fibrous substance as the water absorbing material, for example, a ceramic fiber, a glass wool fiber, a rock wool fiber or the like in the form of a cord or cloth may be used to contain the water absorbing material to absorb water. These may be housed in a sealed bag with a slight gap, and may be housed between the slat plate and the pressing plate. Water vapor is easily released. As the fibrous substance, a non-combustible or flame-retardant substance is used.

[0023]

As is apparent from the above description, according to the present invention, it is possible to prevent natural evaporation of water contained in the water absorbing material, and
Since the sealed bag is destroyed by heat, it does not prevent evaporation of water in case of fire. Further, since a large number of through holes are formed in the pressing plate that supports the closed bag, the vaporized water vapor can be easily discharged to the outside, and the vapor pressure is not increased.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a heat shield slat for explaining an embodiment of the present invention.

FIG. 2 is an explanatory view of an example of a method for manufacturing the slats shown in FIG.

FIG. 3 is a sectional view of a heat shield slat for explaining another embodiment of the present invention.

[Explanation of symbols]

1 ... slat plate, 2 ... pressing plate, 3 ... water absorbing material, 4 ... sealing bag, 5 ... through hole, 6 ... heat insulating material.

Claims (3)

[Claims] 1. A pressing plate having a large number of through holes formed at intervals on the back side of a slat, and a sealed bag made of impermeable resin that is held between the slat and the pressing plate and is thermally destroyed. A heat shield slat having a water absorbing material containing filled water. 2. The heat shield slat according to claim 1, wherein the water absorbing material is supported by a non-combustible or flame-retardant fibrous substance. 3. The heat shield slat according to claim 1, wherein a heat insulating material is interposed between the slat and the closed bag.