JP6340460B1 - Eaves ceiling material and eaves ceiling structure - Google Patents

Abstract

[PROBLEMS] To prevent an eaves ceiling material 21 from cracking and falling off even when heat from a fire or the like is applied without adding a separate heat insulating material, and an aluminum foil 25 as a heat blocking layer in the eaves back ceiling material 21 This will prevent the corrosion of the material and ensure that its thermal insulation effect can be demonstrated. A base material 22 made of a volcanic glassy multilayer board in which rock wool layers 22b are laminated and integrated on both sides of a volcanic glassy sediment layer 22a, and an eave back space in the base material 22 during construction. And an aluminum multilayer sheet 24 integrally bonded to the back surface located on the 5 side. In the aluminum multilayer sheet 24, a polyethylene terephthalate resin film 26 for moisture prevention is integrally bonded to the base material 22 side of the aluminum foil 25, and a pulp paper 27 for moisture prevention is integrally bonded to the opposite side of the base material 22, respectively. A three-layer structure. [Selection] Figure 3

Description

  The present invention relates to an eaves back ceiling material and an eaves back ceiling structure using the same.

  In general, in areas where buildings are densely populated, such as urban areas, there is a possibility that great damage will occur due to the spread of fire if a fire breaks out. Buildings based on standards with fire resistance required according to the requirements are required.

  The building eaves also use non-combustible materials such as calcium silicate boards and slag gypsum boards as ceiling eaves to prevent the fire from spreading in the neighboring house.

  In order to improve the fire resistance of such eaves, as shown in Patent Document 1, conventionally, as the eaves-back ceiling material to be constructed on the back of the eaves, the back surface of the base material made of a calcium silicate plate or the like (eave back space It is proposed that a fireproof reinforcing layer in which any one of a fireproof heat insulating layer, a heat blocking layer, and an endothermic layer is stacked is laminated on the side facing the surface. An aluminum foil having a thickness of 0.2 mm is exemplified as the heat blocking layer.

Japanese Patent No. 5135133

  By the way, in the thing of said patent document 1, since the aluminum foil is used as a heat shielding layer, the heat shielding effect of the aluminum foil makes it difficult for the heat of the combustion gas at the time of a fire in a neighboring house to be transferred to the eaves space. In addition, it is possible to prevent the eaves from spreading by suppressing the temperature rise in the eaves back space.

  However, since the base material of the eaves ceiling material is a calcium silicate plate, when heated for a long time (for example, about 35 minutes) in a fire, the base material is broken and the aluminum foil is peeled off or the eaves ceiling material is dropped. It is unavoidable that the combustion gas enters the eaves space. By adding a heat insulating material to the back side to form a double structure, fire resistance can be improved, but the cost is increased and the construction is time-consuming and cannot be a preferable solution.

  In addition, the aluminum foil bonded to the back surface of the base material is easily corroded when dirt and moisture adhere to it, and when the corrosion proceeds, a hole is opened in the aluminum foil. In particular, in the structure where the eaves space is ventilated by providing vents and vents so that moisture does not accumulate in the eaves space and the wood is not corroded, for example, rain and rain may occur on the back side of the eaves ceiling material when wind and rain are heavy. As water enters and accumulates in the back of the ceiling, it becomes easy to corrode. In this case, the heat shielding effect inherent in the aluminum foil cannot be obtained sufficiently, and combustion gas is transmitted to the eaves back space in the event of a fire, and the temperature rise in the eave back space cannot be satisfactorily suppressed.

  The present invention has been made in view of such various points, and its purpose is to devise the structure of the eaves back ceiling material, so that the eaves can be heated even if heat such as a fire is applied without adding a separate heat insulating material. The purpose of the invention is to prevent the back ceiling material from cracking and to prevent corrosion of the aluminum foil as a heat shielding layer for a long period of time so that the heat shielding effect can be reliably exhibited in a fire or the like.

  In order to achieve the above-mentioned object, in the present invention, the base material of the eaves back ceiling material is a volcanic glassy multilayer board that does not break when heated, and the aluminum foil that is bonded to the back surface is a moisture-proof material on both sides To prevent moisture.

Specifically, the first invention is an eaves roof ceiling material constructed on the eaves of a building, wherein the rock wool layer is laminated and integrated on both sides of the volcanic glassy sediment layer. A base material composed of a multi-layer board, and in this base material, an aluminum multi-layer sheet integrally bonded to the back surface located on the eaves space side during construction, the aluminum multi-layer sheet, an aluminum foil , A polyethylene terephthalate resin film that is integrally bonded to the base side of the aluminum foil and moisture-proof from the base side, and an aluminum foil that is integrally bonded to the anti-base side of the aluminum foil. and characterized by being perforated and pulp paper to moisture from the side.

  In the first invention, since the aluminum multilayer sheet including the aluminum foil is bonded to the back surface of the base material of the eaves back ceiling material, the aluminum foil functions as a heat shielding layer that blocks combustion gas, and the aluminum foil Due to the heat shielding effect (gas shielding effect), the combustion gas at the time of a fire becomes difficult to be transmitted to the eaves back space, and the temperature rise of the eave back space can be suppressed to prevent the eaves from spreading.

  The base material is a volcanic glassy multilayer board in which rock wool layers are laminated and integrated on both sides of the volcanic glassy sediment layer, and the volcanic glassy multilayer board is lightweight. It has the property of not cracking even when heated. In other words, volcanic glassy multilayer boards are different from cement-based and calcium silicate-based boards, and these board-based cement-based and calcium silicate-based boards contain free water and bound water. The plate material cracks due to evaporation and rapid shrinkage caused by heating during a fire, whereas volcanic vitreous multi-layer boards are less prone to such cracking and heat shrinkage is small. Therefore, even if it is heated for a long time of 45 minutes or more in a fire, the base material does not crack, and the back side aluminum multilayer sheet (aluminum foil) peels off from the base material due to cracking or shrinkage of the base material. The possibility of falling or falling off the eaves ceiling material is extremely low, and the fire resistance of the eaves ceiling material can be improved without requiring a separate heat insulating material.

Also, the aluminum multilayer sheet adhered to the back surface of the base material made of this volcanic glassy multilayer board is composed of a polyethylene terephthalate resin film on the base material side and pulp paper on the anti-base material side on both sides of the aluminum foil. Since the aluminum foil has a three-layer structure, the aluminum foil is prevented from coming into contact with surrounding moisture and moisture by the polyethylene terephthalate resin film and pulp paper , and the aluminum foil is prevented from corroding in advance. Can do. As a result, even if a long period of time elapses, no hole is opened in the aluminum foil due to corrosion, and the original heat shielding effect (gas shielding effect) can be reliably exhibited.

And since the polyethylene terephthalate resin film is arranged on the substrate side of the aluminum foil and the pulp paper is arranged on the opposite substrate side, the aluminum foil is moisture-proof from the substrate side by the polyethylene terephthalate resin film. hand the Ru can, pulp paper can be moisture-proof aluminum foil from the opposite substrate side by the adhesive is impregnated.

In addition, since the aluminum multilayer sheet is an aluminum foil in which a polyethylene terephthalate resin film and pulp paper are bonded and integrated, the polyethylene terephthalate resin film and pulp paper burned in the event of a fire. Even so, further spread of fire is suppressed by the integral structure with the aluminum foil. Moreover, since the polyethylene terephthalate resin film and pulp paper both have a lower calorific value at the time of combustion than other resins, the temperature of the eaves space rises excessively when they burn. It can prevent the spread of fire .

The second invention is characterized in that, in the first invention, the pulp paper is bonded to the aluminum foil with an adhesive having moisture resistance . Thus, the pulp paper can moisture-proof the aluminum foil from the side opposite the substrate by impregnation with the adhesive.

3rd invention is the 1st or 2nd invention . WHEREIN: The coating film which consists of a nonflammable coating which has a gas shielding effect is provided in the base material in the surface located on the opposite side to an eaves back space at the time of construction. It is characterized by that.

In this third invention, since the coating film made of non-combustible paint is provided on the base material surface of the eaves back ceiling material, the surface of the eaves ceiling is exposed to flames such as fire when the eaves back ceiling material is constructed. Even if high temperature gas is permeated through the eaves ceiling material directly from the surface of the eaves ceiling material and enters the eaves space, the hot gas remains on the surface of the base material (eaves ceiling material). On the side, it will be shielded by a coating of non-combustible paint. This suppresses the entry of high-temperature gas into the eaves space and suppresses an increase in the temperature of the eaves space.

A fourth invention relates to an eaves-back ceiling structure, and this eaves-back ceiling structure is characterized in that any one of the eaves-back ceiling materials of the first to third inventions is constructed.

In the fourth invention, as in the first invention, the eaves ceiling material constructed in the eaves ceiling structure is formed on the back surface of the base made of a volcanic vitreous multilayer board and on each side of the aluminum foil. Since the aluminum multilayer sheet formed by integrally bonding the polyethylene terephthalate resin film on the base material side and the pulp paper on the anti-base material side is adhered, the aluminum foil of the aluminum multilayer sheet is a heat shielding layer. As a result, the heat of the combustion gas at the time of a fire becomes difficult to be transmitted to the back of the eaves space, and it is possible to prevent the eaves from spreading by suppressing the temperature rise in the back of the eaves. In addition, since the base material made of a volcanic glassy multilayer board is lightweight and has the property of not cracking even when heated, the base material cracks even if heated for a long time of 45 minutes or more in a fire, and the aluminum multilayer sheet The (aluminum foil) does not peel off and the eaves ceiling material does not fall off, and the fire resistance of the eaves ceiling material can be improved without using a separate heat insulating material. In addition, since the aluminum multilayer sheet is obtained by integrally bonding a polyethylene terephthalate resin film and pulp paper to both sides of the aluminum foil, the moisture-proof material prevents the aluminum foil from contacting surrounding moisture and moisture. Thus, corrosion of the aluminum foil can be prevented in advance, and even if a long period of time elapses, no hole is opened in the aluminum foil due to corrosion, and the original heat shielding effect can be surely exhibited.

The fifth invention is characterized in that, in the fourth invention, a ventilation port or ventilation device for the eaves space is provided.

In the fifth aspect of the present invention, if an air vent or ventilator is provided in the eaves space, it is possible to circulate outside air through the eaves space and prevent the corrosion of the wood due to moisture accumulation. In the case of severe weather, rainwater enters the back side of the eaves back ceiling material, and water accumulates on the back side of the eaves back ceiling material, so that the aluminum foil is easily corroded. Even so, it is possible to prevent the aluminum foil from coming into contact with moisture and moisture with a moisture-proof material, and to prevent the aluminum foil from corroding for a long period of time. It can be demonstrated.

As explained above, according to the present invention, as the eaves roof ceiling material to be constructed on the eaves of a building, on the back surface of the base material made of a volcanic glassy multilayer board, both sides of the aluminum foil are polyethylene on the base side. By integrally bonding the aluminum multilayer sheet with the terephthalate resin film and pulp paper on the side opposite to the base material bonded together, the heat shielding effect of the aluminum foil allows the combustion gas to enter the eaves space. By preventing this, it is possible to prevent the spread of the eaves while suppressing the temperature rise in the eaves back space. In addition, due to the characteristics of the base material composed of volcanic glassy multilayer boards, it is possible that the base material will crack and the aluminum foil will peel off from the base material or the eaves ceiling material will fall off even if heated for a long time during a fire. In addition, the fire resistance of the eaves ceiling material can be improved. In addition, aluminum multilayer sheets in which polyethylene terephthalate resin film and pulp paper are integrally bonded to the base material side and the non-base material side of the aluminum foil respectively, prevent the aluminum foil from coming into contact with surrounding moisture and moisture. It is possible to prevent the corrosion of the aluminum foil over a long period of time by suppressing it by the material, and to reliably exhibit the original heat shielding effect of the aluminum foil.

FIG. 1 is a cross-sectional view showing an eaves back ceiling structure according to Embodiment 1 of the present invention. FIG. 2 is an enlarged perspective view showing a main part of the ventilated hardware in the eaves back space. FIG. 3 is a cross-sectional view of the eaves ceiling material according to Embodiment 1 of the present invention. FIG. 4 is a perspective view showing an eaves-in-ceiling structure according to Embodiment 2 of the present invention in a state where ventilation hardware is removed. FIG. 5 is a diagram showing a temperature rise and a state when a sample of the eaves back ceiling material is heated for 45 minutes for the semi-fire resistance test.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The following description of the embodiments is merely illustrative in nature and is not intended to limit the present invention, its application, or its use at all.

(Embodiment 1)
FIG. 1 shows an eaves-in-ceiling structure according to Embodiment 1 of the present invention, and this eaves-in-ceiling structure is constructed, for example, in an eaves of a wooden detached house (building). This eave protrudes outward from the outer wall W of the house, and includes a purlin (not shown) and a rafter 2 spanned over the eaves girder 1 according to the slope of the roof as a main structure. An eaves tip portion of the rafter 2, an eaves girder 1 that supports the rafter 2, and a nose cover 3 that is arranged outside the eaves girder 1 in parallel with the eaves girder 1 and is fixed to the rafter 2 so as to hide its tip. The eaves are made up of. On the lower side of the eaves, an eaves back space 5 having a triangular cross section is defined in a portion surrounded by the rafters 2, the eaves girder 1 and the nose cover 3, and a lower opening 5a (outer wall) of the eaves back space 5 is formed. The space between W and the nose cover 3 is closed by a plurality of rectangular plate-shaped eaves-back ceiling materials 21, 21,... According to Embodiment 1 of the present invention.

  An eaves-end suspension tree 7 is attached to the front end surface of the rafter 2 on the back side (inner side) of the nose cover 3, and an eaves-end lower tree 8 is suspended and supported at the lower end of the eaves end suspension 7. The eaves upper wood 9 parallel to the eaves girder 1 is attached to the rafter 2 on the eave girder 1 side, and the eaves lower wood 11 is supported by the eaves upper wood 9 via the eaves original suspension tree 10. . A plurality of eaves mounting trees 12, 12,... (Field edges) arranged at regular intervals along the eaves girder 1 are connected between the eaves end lower tree 8 and the eaves original lower tree 11. A base for constructing the eaves back ceiling materials 21, 21,... Is formed by the eaves mounting trees 12, 12,.

  And the plurality of eaves-back ceiling materials 21, 21,... Are arranged in the opening 5a of the eaves-back space 5 in a state where they are butted against each other in the width direction without gaps, and the respective peripheral portions thereof are screws, nails, tapping screws, It fixes to the eaves top attachment tree 12 and the eaves end lower tree 8 with the stopper (not shown), and the eaves back ceiling material 21 is constructed in the eaves back by this.

  The inner end of each of the eaves ceiling materials 21 is constructed with a gap between the eaves ceiling material 21 and the outer wall W, and the eaves space 5 is formed between the eaves ceiling material 21 and the outer wall W. A ventilating hardware 15 (ventilator) is provided for ventilation. The ventilation hardware 15 has a long metal body 16 made of, for example, a galvanized steel plate or a stainless steel plate that extends along the direction in which the eaves-back ceiling materials are arranged. As shown in FIG. 2 in an enlarged manner, the hardware main body 16 includes a lower horizontal portion 16a that extends horizontally and is mounted and fixed on the upper end of the outer wall W at the inner end portion, and an outer end of the lower horizontal portion 16a. And an inner vertical wall portion 16b extending upward from the portion. The upper side of the inner vertical wall portion 16b is connected to an upper horizontal portion 16c that extends horizontally outward and then is folded back and extends inward in the horizontal direction. 12 is attached and fixed in a state of being sandwiched between the eaves top mounting tree 12 and the eaves back ceiling material 21. An outer vertical wall portion 16d extending obliquely inward toward the lower side is connected to the inner end portion of the lower portion of the upper horizontal portion 16c, and a lower end portion of the outer vertical wall portion 16d is connected to the lower end portion of the outer horizontal wall portion 16d. A parting part 16e that extends outward and then is bent upward is connected. The parting part 16e extends outward at the same height as the lower horizontal part 16a, and has an outer end ( The front end portion is close to or in contact with the lower surface of the eaves back ceiling material 21. And the upper horizontal part 16c located between the inner vertical wall part 16b and the outer vertical wall part 16d is formed with a plurality of ventilation holes 17, 17,. The eaves space 5 is ventilated between the outside space (atmosphere) using the ventilation hole 17 and the space between the inner and outer vertical wall portions 16b and 16d as a ventilation passage 18.

  Further, a concave groove portion 16f that opens toward the outer vertical wall portion 16d is formed in the upper and lower intermediate portions of the inner vertical wall portion 16b of the hardware body 16, and a predetermined temperature (for example, 180 ° C.) is formed in the concave groove portion 16f. ) A foam material 19 made of expanded graphite or the like that expands (foams) and fills the ventilation passage 18 as described above is filled, and the ventilation passage 18 is blocked by the expansion of the foam material 19 in the event of a fire. High temperature gas is prevented from entering the eaves space 5 via the ventilation passage 18.

  In addition, the said ventilation metal fitting 15 is an illustration, and it cannot be overemphasized that the ventilation metal fitting of another structure can be used.

  As shown in FIG. 3, the above-mentioned eaves-ceiling ceiling material 21 has a rectangular plate-like base material 22 and a back surface side of the base material 22, that is, eaves-behind ceiling structure 5 on the eaves back space 5 side. The aluminum multi-layer sheet 24 integrally bonded to the upper side by an adhesive on the upper side and the surface side of the base material 22, that is, the lower side positioned opposite to the eaves space 5 at the time of construction of the eaves ceiling structure And provided non-combustible coating film 30. As an adhesive for adhering the aluminum multilayer sheet 24 to the base material 22, for example, a urethane resin-based adhesive is used.

The base material 22 is made of a volcanic glassy multilayer board (for example, “Dailite”, trade name manufactured by Daiken Kogyo Co., Ltd.). Specifically, the volcanic glassy multilayer board is a multilayer board having a thickness of, for example, 12 mm, in which rock wool layers 22b and 22b are laminated and integrated on both sides of the volcanic glassy sediment layer 22a. In each of the layers 22a and 22b, aluminum hydroxide is mixed as an inorganic powder. The substrate 22 has a density of, for example, 0.5 to 0.9 g / cm ³ . In addition, as for the thickness of the base material 22, 9-18 mm is preferable.

  The aluminum multilayer sheet 24 includes an aluminum foil 25, a polyethylene terephthalate resin film 26 as a base material-side moisture-proof material bonded integrally to the base material 22 side of the aluminum foil 25 with an adhesive, and an aluminum foil 25. It consists of a sheet of a three-layer structure with pulp paper 27 as an anti-base material side moisture-proof material integrally bonded to the base material 22 opposite side (the anti-base material side) with an adhesive.

The aluminum foil 25 functions as a heat shielding material. For example, the thickness of the aluminum foil 25 is about 0.025 to 0.035 mm and is extremely thin, and the weight is about 72.9 to 89.1 g / m ² . The reason why the aluminum foil 25 is thinned in this way is that the volcanic glassy multilayer board as the base material 22 to be bonded is difficult to break and has excellent dimensional stability, and has a larger specific gravity than a rock wool board or the like. Since the strength is high, there is very little possibility that the base material 22 is cracked and high-temperature combustion gas enters from that portion and a hole is opened in the aluminum foil 25, and the thin-film aluminum foil 25 having the above thickness is provided. This is because sufficient strength can be secured, and on the other hand, considering that the thermal conductivity of aluminum is extremely high, the heat transmitted to the back of the eaves can be lowered with the thinnest foil.

  Moreover, the polyethylene terephthalate resin film 26 adhered to the base material side of the aluminum foil 25 and the pulp paper 27 adhered to the anti-base material side both prevent the influence of moisture on the aluminum foil 25, This is to prevent the aluminum foil 25 from being corroded by moisture (water).

The polyethylene terephthalate resin film 26 has a thickness of, for example, about 0.012 mm and a weight of, for example, about 17.0 g / m ² .

On the other hand, the thickness of the pulp paper 27 is, for example, about 0.033 mm, and the weight is, for example, about 0.6-23.0 g / m ² .

  The adhesive for bonding the polyethylene terephthalate resin film 26 (base material side moisture-proof material) and the pulp paper 27 (anti-base material side moistureproof material) to the aluminum foil 25 is, for example, urethane resin type having moisture resistance. The adhesive is used.

  The nonflammable coating film 30 formed on the surface of the substrate 22 is made of a nonflammable paint having a gas shielding effect. That is, the nonflammable coating film 30 has a gas shielding effect (gas barrier effect), and is formed by applying a nonflammable coating material having the same effect on the surface of the substrate 22. In addition, in order to improve the adhesiveness of the nonflammable coating film 30 to the base material 22, after forming the undercoat film with the undercoat paint on the surface of the base material 22, the nonflammable paint film 30 is formed on the undercoat paint film. It is desirable to form.

  The non-combustible coating film 30 (non-combustible paint) includes, for example, a layered clay mineral having a swelling property that swells in water as a paint is formed, and a fixing resin. That is, as the layered clay mineral, for example, a layered clay mineral (silicate mineral) having high swellability such as vermiculite or bentonite is used. The swelling property of the layered clay mineral is desirably 20 ml / 2 g or more in the swelling power test of the 15th revision Japanese Pharmacopoeia, for example.

  The composition ratio of the layered clay mineral in the incombustible paint is desirably 20 to 80% by weight. If the amount is less than 20% by weight, the nonflammable performance is deteriorated and the function is not exhibited. On the other hand, if the amount exceeds 80% by weight, the resin is relatively difficult to enter.

  On the other hand, as the resin, for example, an acrylic resin, a urethane resin, a vinyl acetate resin, a polyvinyl alcohol resin, or the like is used. The composition ratio of this resin is desirably 20 to 50% by weight. If it is less than 20% by weight, the strength of the coating film becomes too low and the coating film is peeled off. On the other hand, if it exceeds 50% by weight, the amount of resin as a combustible material increases relatively, and the nonflammability cannot be secured. .

  In addition, inorganic powders such as calcium carbonate, titanium oxide, and aluminum hydroxide may be added to the incombustible paint as an extender or colorant in an amount of about 0 to 60% by weight.

The application amount of the incombustible coating material may be, for example, about 30 to 150 g / m ² in terms of solid content, and can be appropriately selected according to the design. If the coating amount is too small, the incombustible effect cannot be obtained, and if it is too large, coating becomes difficult.

  The mechanism by which this incombustible coating film 30 (incombustible paint) shields gas and gas will be explained schematically. The clay mineral particles are layered with a large number of flake components, and water is added during coating. Then, the clay mineral particles absorb water in the paint and swell, the layer between the flake components spreads, and the flake component (layer) enters between the other flake components (interlayer) with mixing. When this paint is applied to the front surface (and the back surface) of the base material 22 and dried with a dryer, the flake components (interlayers) shrink and narrow, and the flake components of the particles enter and mesh with each other. Even if the flammable high temperature gas fixed by the resin tries to permeate between the particles, it is shielded by the meshed flake components, and a gas shielding effect can be obtained. This incombustible coating film 30 is not destroyed even when it is splashed with water.

  The surface of the nonflammable coating film 30 in the eaves-backed ceiling material 21 may be subjected to surface decoration by finishing coating or attaching a decorative sheet as necessary. Alternatively, after the eaves back ceiling material 21 is constructed, finish painting can be performed at the construction site.

  Therefore, in this embodiment, the eaves roof ceiling material 21 is fixed to the eaves top mounting tree 12 and the eaves undercarriage 8 below the eaves back space 5 of the building and fixed by a stopper such as a screw or a nail. At that time, since the base material 22 of the eaves back ceiling material 21 is a volcanic glassy multilayer board, not only can it be easily cut and the workability is good, but even if a stopper penetrates the peripheral part. It is not cracked and excellent workability is obtained.

  The eaves roof ceiling material 21 thus constructed on the lower side of the eaves space 5 of the building is obtained by bonding the aluminum multilayer sheet 24 including the aluminum foil 25 to the back surface of the base material 22. Even if the (volcanic glassy multilayer board) is a material through which combustion gas passes during a fire or the like, the aluminum foil 25 functions as a heat blocking layer that blocks the combustion gas. (Gas shielding effect) makes it difficult for combustion gas and its heat during a fire to be transmitted to the eaves back space 5, and to prevent the eaves from spreading out by suppressing the temperature rise of the eaves back space 5.

  The base material 22 is a lightweight volcanic vitreous multilayer board in which rock wool layers 22b and 22b are laminated and integrated on both sides of the volcanic vitreous deposit layer 22a. And if the base material is a cement-based or calcium silicate-based plate material, these plate materials contain free water and bound water, so the free water and bound water evaporate with heating during a fire and rapidly By contracting, the plate material is cracked. On the other hand, unlike the cement-based or calcium silicate-based plate material, the base material 22 made of this volcanic vitreous multilayered plate is unlikely to generate cracks like the cement-based or calcium silicate-based plate material. Since the shrinkage due to heating is small, the aluminum multilayer sheet 24 on the back side is peeled off due to cracking or shrinkage due to heating of the base material 22, or the nonflammable coating film 30 on the front side is cracked or peeled off. Or possibility that the base material 22 will fall will become very low. As a result, even if the eaves ceiling material 21 is heated for a long time of 45 minutes or more during a fire, the heat shielding function of the aluminum foil 25 and the gas shielding function of the nonflammable coating film 30 in the aluminum multilayer sheet 24 are stabilized. Can be maintained. Therefore, the fire resistance of the eaves back ceiling material 21 can be improved without requiring a separate heat insulating material.

  Further, since aluminum hydroxide is mixed in the volcanic vitreous multilayer board as the base material 22, crystal water is pyrolyzed and released during heat generation, and the temperature rise can be reduced by the endothermic reaction.

  And the aluminum multilayer sheet 24 adhered to the back surface of the base material 22 made of this volcanic glassy multilayer board is a polyethylene terephthalate resin film 26 as a base material side moistureproof material on both sides of the aluminum foil 25, Further, since the pulp paper 27 is integrally bonded as an anti-base material side moisture-proof material, even if the aluminum foil 25 tries to come into contact with surrounding moisture and moisture, it is caused by the polyethylene terephthalate resin film 26 and the pulp paper 27. Thus, the aluminum foil 25 can be moisture-proofed from the base material side by the polyethylene terephthalate resin film 26 and moisture-proof from the anti-base material side by the pulp paper 27 impregnated with the moisture-proof urethane resin adhesive. Moreover, since the adhesive for adhering the polyethylene terephthalate resin film 26 and the pulp paper 27 to the aluminum foil 25 is also moisture-proof, for example, urethane resin, the aluminum foil 25 is also moisture-proof by the adhesive. The As a result, corrosion of the aluminum foil 25 can be effectively prevented in advance, and even if a long period of time elapses after construction, no hole is opened in the aluminum foil 25 due to corrosion, and the original heat shielding effect is fired. It can be surely demonstrated at times.

  In particular, when the ventilation hardware 15 of the eaves space 5 is provided in the eaves back ceiling structure, it is possible to circulate outside air to the eaves space 5 and prevent corrosion of the wood due to moisture accumulation, On the other hand, when wind and rain are intense, rainwater enters the back side of the eaves-back ceiling material 21, and water accumulates on the back surface of the eaves-back ceiling material 21, resulting in an environment in which the aluminum foil 25 is easily corroded. However, the aluminum foil 25 is prevented from coming into contact with moisture and moisture by the polyethylene terephthalate resin film 26, the pulp paper 27, and the urethane resin adhesive, thereby reliably preventing the corrosion of the aluminum foil 25. can do.

  Further, since the aluminum multilayer sheet 24 is obtained by integrating the polyethylene terephthalate resin film 26 and the pulp paper 27 with the aluminum foil 25 by bonding with an adhesive, in the unlikely event of a fire, the polyethylene terephthalate resin film Even if the 26 or the pulp paper 27 is burned, further fire spread is suppressed by the structure in which they are integrated with the aluminum foil 25. In addition, the polyethylene terephthalate resin film 26 and the pulp paper 27 both have a lower calorific value during combustion than other resins (for example, polyethylene terephthalate resin is about 5500 kcal / kg, and paper is about 5000 kcal / kg). On the other hand, polyethylene resin is about 11000 kcal / kg, polypropylene resin is about 11100 kcal / kg), and accordingly, when these are burned, the temperature of the eaves space 5 can be prevented from excessively rising, thus spreading the fire. I can stop.

  Moreover, since the nonflammable coating film 30 which consists of a nonflammable coating which has a gas shielding effect is provided in the base-material 22 surface of the eaves back ceiling material 21, when the eaves back ceiling material 21 is constructed, fire etc. Even if the surface of the eaves ceiling material 21 is exposed to the flame of the eaves and high temperature gas tries to penetrate the eaves ceiling material 21 directly from the surface of the eaves ceiling material 21 and enter the eaves space 5, The high temperature gas is shielded by the incombustible coating film 30 on the surface side of the base material 22 (eave back ceiling material 21). This suppresses the entry of high-temperature gas into the eaves space 5 and further suppresses the increase in the temperature of the eaves space 5.

  And the eaves back ceiling material 21 which concerns on this embodiment is a thing of the structure where the aluminum multilayer sheet 24 containing the aluminum foil 25 is integrally adhere | attached on the back surface side (upper side) of the base material 22 previously with the adhesive agent. For the purpose of improving the fire resistance of the existing eaves ceiling material, it is greatly different from the structure in which the eaves roof ceiling material itself is used as a base material and aluminum foil is bonded to the back surface thereof. That is, when the aluminum foil is bonded to the back surface using the eaves back ceiling material itself as a base material, it is necessary to avoid that the aluminum foil is torn during construction (the failure of the heat shielding effect of the aluminum foil is lost due to this damage). Therefore, it is necessary to use an aluminum foil having a certain thickness, and it is not possible to use a thin foil as thin as 0.03 mm as in this embodiment. In addition, when the eaves ceiling material itself is used as the base material, and the aluminum foil is adhered to the base material, there may be a non-adherent location where the aluminum foil does not partially adhere to the base material. When it occurs, the combustion gas (flame) enters from the non-contact portion.

  On the other hand, the eaves roof ceiling material 21 according to the present embodiment has an aluminum multilayer sheet 24 including an aluminum foil 25 integrally formed on the back side of a base material 22 made of a volcanic glassy multilayer board in advance by an adhesive. Therefore, there is almost no room for the above-described problems, and this has a great advantage over a structure in which an aluminum foil is bonded to the back surface of the eaves back ceiling material itself as a base material.

  Specifically, according to the present invention, the substrate 22 having a thickness of 12 mm made of a volcanic vitreous multilayer plate in which rock wool layers 22b and 22b are laminated and integrated on both sides of the volcanic vitreous deposit layer 22a, respectively. On the back side, an aluminum multilayer sheet 24 in which a polyethylene terephthalate resin film 26 is bonded to a base material side of an aluminum foil 25 having a thickness of 0.03 mm and a pulp paper 27 is bonded to a non-base material side by a urethane resin adhesive, respectively. 45 minutes eaves quasi-refractory structure certification is obtained by a single eaves roof ceiling material 21 to which is attached.

(Embodiment 2)
FIG. 4 shows an eaves-in-ceiling structure according to Embodiment 2 of the present invention (note that the same parts as those in FIGS. 1 to 3 are given the same reference numerals and detailed description thereof is omitted), The ventilation structure is changed.

  In this embodiment, unlike the first embodiment, the ventilated hardware 15 is constructed at an intermediate portion of the eaves and the eaves. The plurality of eaves-back ceiling members 21, 21,... Are arranged so that the length direction thereof is along the eaves-end lower tree 8 and the eaves-end lower tree 11, and It is attached and fixed over the attachment tree 12. A space is provided between the adjacent eaves back and ceiling materials 21, 21, and ventilation hardware 15 is disposed at this space. The ventilated hardware 15 has a hardware main body 16 made of a long and thin plate material having a substantially hat-shaped cross section having a concave groove portion 16f recessed upward in the widthwise intermediate portion, and the concave groove portion 16f has a groove width on the groove bottom side. The dovetail shape is wider than the opening side. And the ventilation metal fitting 15 fits the outer surface of the concave groove portion 16f into the space between the eaves-back ceiling materials 21 and 21, and presses the end portion of the eaves-back ceiling material 21 at both ends in the width direction other than the concave groove portion 16f. In addition, the both ends of the length direction and the middle part are screwed to the eave ceiling mounting wood 12 with screws V. In addition, a plurality of ventilation holes (not shown in FIG. 4) are formed in the bottom of the concave groove portion 16f so as to be lined up in the length direction of the concave groove portion 16f. Ventilation with the atmosphere). Note that both end portions in the length direction of the recessed groove portion 16f are closed by end caps (not shown) attached to one end portion of the hardware main body 16. The eaves back ceiling material 21 and other structures are the same as those in the first embodiment.

  Therefore, in the case of this embodiment, the same effects as those of the first embodiment can be achieved even in the eaves back ceiling structure in which the ventilation hardware 15 is in the middle part of the eaves.

(Other embodiments)
In the above embodiments, it is provided with the ventilation hardware 16 for ventilating the eaves back space 5 eaves back ceiling structure or may be a ventilator of another structure, or eaves back space provided vent 5 may be ventilated.

  Next, specific examples will be described.

(Example)
The base material is a 12 mm thick volcanic vitreous multilayer board (Daiken Kogyo (Daiken Kogyo), which is formed by laminating and integrating 2.5 mm thick rock wool layers on both sides of a 7 mm thick volcanic glassy sediment layer. Co., Ltd., trade name “Dylite”). The aluminum multilayer sheet is made of 0.03 mm thick aluminum foil, 0.012 mm thick polyethylene terephthalate resin film on one side, and 0.033 mm thick pulp paper on the other side. A composite sheet having a three-layer structure integrally bonded with each other was used. Then, this aluminum multilayer sheet is integrally bonded to the back surface of the base material with a urethane resin adhesive so that the polyethylene terephthalate resin film is on the base material side and the pulp paper is on the anti-base material side. A sample of eaves ceiling material was used. The density of the eaves back ceiling material was 0.6 g / cm ³ .

(Comparative Example 1)
In the examples, it was assumed that there was no aluminum multilayer sheet, and a volcanic vitreous multilayer board itself having a thickness of 12 mm was used as a sample of eaves ceiling material.

(Comparative Example 2)
A 14-mm-thick calcium silicate plate is used as a base material, and the same aluminum multilayer sheet as that of the example is formed on the back surface thereof. A urethane resin so that the polyethylene terephthalate resin film is on the base material side and the pulp paper is on the anti-base material side. A sample of eaves ceiling material was obtained by integrally bonding with a system adhesive. The density of the eaves back ceiling material was 1.1 g / cm ³ .

(Eave back quasi fire resistance test)
A quasi-fire resistance test was performed on the samples of Examples and Comparative Examples 1 and 2 by continuously applying a flame of a burner from the surface side of the substrate. FIG. 5 shows the temperature of the sample and its state when 45 minutes have elapsed from the start of the test.

  As is clear from FIG. 5, in the example in which the aluminum multilayer sheet was adhered to the back surface of the base material composed of the volcanic glassy multilayer board, the temperature rise was low even after 45 minutes, and the base material cracked. There is no dropout due to. In Comparative Example 1 of the volcanic vitreous multilayer board itself, the dropout due to cracking does not occur as in the Example, but the temperature is higher than in the Example. And in the comparative example 2 whose base material is a calcium silicate board, even if the aluminum multilayer sheet of an Example is adhere | attached on the back surface, a base material is cracking and falling off, The heat-blocking effect of an aluminum multilayer sheet Is not being utilized. Thus, as in the present invention, the heat shielding function of the aluminum foil can be stably maintained by integrally bonding the aluminum multilayer sheet to the back surface of the volcanic glassy laminate as the base material. It can be seen that the fire resistance of the ceiling material can be improved.

  The present invention does not break the base material of the eaves ceiling material even when heated at the time of a fire, can improve the fire resistance of the eaves ceiling material, and can reliably demonstrate the original heat shielding effect of the aluminum foil, It is extremely useful and has high industrial applicability.

5 Back space 15 Ventilation hardware (ventilator)
16 Hardware body 17 Ventilation hole 19 Foam material 21 Eaves back ceiling material 22 Base material 22a Volcanic glassy sediment layer 22b Rock wool layer 24 Aluminum multilayer sheet 25 Aluminum foil 26 Polyethylene terephthalate resin film (base material side moisture-proof material)
27 Pulp paper (anti-base material moisture-proof material)
30 Nonflammable coating

Claims (5)

It is the eaves ceiling material that is constructed on the eaves of the building,
A substrate composed of a volcanic glassy multilayer board in which rock wool layers are laminated and integrated on both sides of a volcanic glassy sediment layer;
In the above-mentioned base material, comprising an aluminum multilayer sheet integrally bonded to the back surface located on the eaves space side during construction,
The aluminum multilayer sheet is integrally bonded to an aluminum foil, a base material side of the aluminum foil, a polyethylene terephthalate resin film that moisture-proofs the aluminum foil from the base material side, and an anti-base material side of the aluminum foil. to be bonded, soffit ceiling material, characterized by comprising possess a pulp paper to moisture aluminum foil from the opposite substrate side. In claim 1,
The eaves ceiling material, wherein the pulp paper is bonded to an aluminum foil with a moisture-proof adhesive. In claim 1 or 2 ,
An eaves-backed ceiling material, wherein a coating film made of a non-combustible paint having a gas shielding effect is provided on a surface of the base material that is opposite to the eaves-backing space during construction. The eaves back ceiling structure in which any one eaves back ceiling material of Claims 1-3 was constructed. In claim 4 ,
An eaves-behind ceiling structure provided with vents or ventilators in the eaves space.

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