Fire resistive covering body

Abstract

To provide a fire resistive covering body with high fire resistance.SOLUTION: A fire resistive covering body 1 with fire resistance is attached so as to cover an indoor side of a mullion 110 partitioning both sides of outer wall panels 120, 120, being provided with: hydroxide aluminum paper 10 provided on the indoor side of the mullion 110 and generating water by being heated by hydroxide aluminum as a main component; and a heat insulation sheet 20 provided on an indoor side of the hydroxide aluminum paper 10 and placed over the outer wall panels 120, 120 placed on both sides.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a fire-resistant coating. [Background technology]

[0002] BACKGROUND ART Conventionally, in the spandrel portion of a curtain wall, a fire-resistant structure is known in which the interior side of the mullions is covered with a mat-like rock wool in order to increase the fire resistance of the mullions (see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2022-52971 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the fire-resistant structure of Patent Document 1, there is a risk that heat from an outdoor fire will be transmitted into the room through the mullions and rock wool.

[0005] Therefore, an object of the present invention is to provide a fire-resistant coating having high fire resistance. [Means for solving the problem]

[0006] As a means for solving the above problem, the present invention provides a fire-resistant coating that is attached to cover a structural member extending in a vertical or horizontal direction and has fire resistance, characterized in that it comprises: a metal hydroxide sheet that is placed on the indoor side of the structural member and is mainly composed of metal hydroxide, and generates water when heated; and an insulating sheet that is placed on the indoor side of the metal hydroxide sheet and has insulating properties.

[0007] With this configuration, since the metal hydroxide sheet is disposed on the indoor side of the structural member, if the structural member is heated by an outdoor (exterior) fire, for example, the heat from the structural member heats the metal hydroxide sheet, producing water. While water is being produced, the structural member, metal hydroxide sheet, and heat insulating sheet are less likely to rise in temperature, and heat is less likely to be transmitted to the indoor side through the heat insulating sheet, improving fire resistance.

[0008] The heat insulating sheet may be covered with a water-retaining film that retains water produced by the metal hydroxide sheet in the metal hydroxide sheet.

[0009] With this configuration, the metal hydroxide sheet covering the heat insulating sheet retains the water generated by the metal hydroxide sheet, making it difficult for the metal hydroxide sheet and the heat insulating sheet to rise in temperature and making it difficult for heat to be transmitted to the indoor side through the heat insulating sheet, thereby increasing fire resistance.

[0010] The water-retaining film may be in the form of a bag, and may encase the metal hydroxide sheet and the heat insulating sheet.

[0011] With this configuration, the bag-shaped water-retaining film encases the metal hydroxide sheet and the insulating sheet, i.e., the water-retaining film packages the metal hydroxide sheet and the insulating sheet, making it easier to retain water and making the fire-resistant coating easier to handle.

[0012] The heat insulating sheet may also have cushioning properties.

[0013] With this structure, even if the interior side of the structural member is uneven, the insulating sheet with its cushioning properties can deform to fit the unevenness and adhere tightly to the surface without any gaps. This tightly fitting insulating sheet provides good insulation and improves fire resistance.

[0014] The present invention also provides a fire-resistant coating that is attached to cover the indoor side of an exterior wall panel and has fire resistance, characterized in that it comprises: an insulating layer that is arranged on the indoor side of the exterior wall panel and is composed of a plurality of insulating sheets butted together; and a metal hydroxide sheet that is arranged on the indoor side of the butted portions of the insulating sheets and has metal hydroxide as its main component and generates water when heated. [Effects of the Invention]

[0015] According to the present invention, a fire-resistant coating having high fire resistance is provided. [Brief explanation of the drawings]

[0016] [Figure 1] FIG. 1 is a perspective view of a fire-resistant covering and an exterior wall structure according to an embodiment of the present invention. [Figure 2] FIG. 2 is a cross-sectional plan view of the fire-resistant coating according to the present embodiment. [Figure 3] FIG. 2 is a cross-sectional plan view of the fire-resistant covering and the exterior wall structure according to the present embodiment after installation. DETAILED DESCRIPTION OF THE INVENTION

[0017] An embodiment of the present invention will be described with reference to FIGS.

[0018] <Exterior wall structure configuration> In this embodiment, an example is shown in which an exterior wall structure 100 is applied to a spandrel panel portion of a metal curtain wall. The exterior wall structure 100 includes a vertically extending mullion 110 (structural member), two exterior wall panels 120, 120 (spandrel panels), and a fire-resistant covering 200 disposed on the indoor side of each exterior wall panel 120.

[0019] <Mullet> The mullions 110 are partition members (mullions) that separate the exterior wall panels 120, 120 arranged on both the left and right sides. The mullions 110 are, for example, extruded members made of aluminum alloy in the shape of a rectangular cylinder, and are supported on the deck (not shown) via metal fittings (not shown).

[0020] <Exterior wall panels> The exterior wall panel 120 is a plate-like member made of, for example, an aluminum alloy (metal). However, the exterior wall panel 120 may also be made of wood. A flange portion 121 extending toward the interior of the room is formed on the exterior wall panel 120 on the side facing the mullion 110. The flange portion 121 is fastened and fixed to the mullion 110 with bolts (not shown).

[0021] <Fireproof coating> The fire-resistant covering 200 is a fire-resistant covering (structure) attached to cover the indoor side of the exterior wall panel 120, and includes a first insulating layer 211, a second insulating layer 212, aluminum hydroxide paper 220 (metal hydroxide sheet), and a water-retaining film 230. The fire-resistant covering 200 is fixed to the back surface (indoor side) of the exterior wall panel 120, for example, by a welding pin 301 that penetrates through the thickness direction.

[0022] <First insulation layer, second insulation layer> The first insulating layer 211 and the second insulating layer 212 are arranged in this order from the outside to the inside of the room. That is, the fire-resistant coating 200 has a two-layer insulating layer structure.

[0023] The first insulating layer 211 is formed by arranging insulating sheets 211A, 211A having insulating and cushioning properties in a surface direction. The insulating sheets 211A are, for example, blankets (cushioning material, cushion sheets) made of rock wool. Between the insulating sheets 211A, 211A adjacent in the surface direction, joints 211B (butt joints) are formed where the insulating sheets 211A, 211A are butted together.

[0024] The second insulating layer 212 is formed by arranging insulating sheets 212A, 212A having heat insulating and cushioning properties in a surface direction, similar to the first insulating layer 211. A joint 212B (abutment portion) is formed between adjacent insulating sheets 212A, 212A in the surface direction. Here, the insulating sheets 211A and 212A may contain a plurality of small pieces or particles of aluminum hydroxide paper 220, making them less susceptible to temperature rise.

[0025] <Aluminum hydroxide paper> The aluminum hydroxide paper 220 is a sheet whose main component is aluminum hydroxide (Al2(OH)3, a metal hydroxide) and which generates water when heated. The aluminum hydroxide paper 220 is arranged on the indoor side of the joint 211B of the first insulation layer 211, and straddles the adjacent insulation sheets 211A, 211A on both sides of the joint 211B. However, it is also possible to provide aluminum hydroxide paper on the indoor side of the joint 212B.

[0026] As a result, for example, if an outdoor fire causes the exterior wall panel 120 to thermally expand and bend toward the outside of the room, opening the joints 211B, and even if the heat of the fire penetrates through the opened joints 211B, the aluminum hydroxide paper 220 makes it difficult for this heat to be transmitted to the inside of the room. That is, when the aluminum hydroxide paper 220 is heated and its temperature rises, it generates water (see formula (1)), and while water is being generated in this way, it becomes difficult for the aluminum hydroxide paper 220, the first insulating layer 211, and the second insulating layer 212 to rise in temperature further, making it difficult for heat to be transmitted to the inside of the room, and improving fire resistance.

[0027] 2Al(OH)3 → Al2O3 + 3H2O … (1)

[0028] <Water-retaining film> The water retentive film 230 covers the indoor side of the second heat insulating layer 212, and retains water generated by the aluminum hydroxide paper 220 in the aluminum hydroxide paper 220 while preventing it from penetrating into the indoor side. The water retentive film 230 is made of, for example, aluminum foil. However, the water retentive film 230 may also be made of, for example, a flame-retardant synthetic resin (such as polyimide).

[0029] <Configuration of fire-resistant coating> The fire-resistant covering 1 is a slender rectangular pillar extending generally vertically (see Figure 1), and is attached to cover the interior side of the mullion 110, providing fire resistance. The fire-resistant covering 1 includes two sheets of aluminum hydroxide paper 10, two sheets of heat insulating sheets 20, and a water-retaining bag 30 (water-retaining film).

[0030] From the outside to the inside of the room, aluminum hydroxide paper 10, heat insulating sheet 20, aluminum hydroxide paper 10, and heat insulating sheet 20 are layered in this order. The entire layered structure is then wrapped in a water retention bag 30, and the wrapped structure is fixed to the back surface (indoor side) of the exterior wall panel 120 with welding pins 302.

[0031] <Aluminum hydroxide paper> The aluminum hydroxide paper 10 is a sheet that contains metal hydroxide as its main component and generates water when heated, similar to the aluminum hydroxide paper 220 described above (see formula (1)). The aluminum hydroxide paper 10 is placed on the indoor side of the mullion 110 and covers the entire indoor side surface 111 of the mullion 110.

[0032] In the width direction, the length L10 of the aluminum hydroxide paper 10 is longer than the length L110 of the mullions 110 (L10 > L110). This allows the aluminum hydroxide paper 10 to cover the entire interior side surface 111 of the mullions 110. In other words, both end portions 11, 11 of the aluminum hydroxide paper 10 in the width direction cover the water-retaining films 230 on both sides of the mullions 110. Here, the length L10 of the aluminum hydroxide paper 10 may be configured to be equal to or greater than the length L110 of the mullions 110 (L10 ≧ L110).

[0033] The aluminum hydroxide paper 10 is a thin layer and can be easily deformed. As a result, even if the interior side surface 111 of the mullion 110 and the water-retentive film 230 are not flush with each other, the aluminum hydroxide paper 10 can easily follow and deform, adhering tightly to the interior side surface 111 and the water-retentive film 230 without any gaps.

[0034] <Thermal insulation sheet> The heat insulating sheet 20 has heat insulating and cushioning properties, similar to the heat insulating sheets 211A and 212A, and is, for example, a blanket made of rock wool. Because the heat insulating sheet 20 has heat insulating properties, it is difficult for heat from the mullions 110 to be transferred to the indoor side. Here, the heat insulating sheet 20 may be configured to contain a plurality of small pieces or grains of aluminum hydroxide paper 10, making it difficult for the temperature to rise.

[0035] In the width direction, the length L20 of the heat insulating sheet 20 is approximately equal to the length L10 of the aluminum hydroxide paper 10, i.e., it is longer than the length L110 of the mullion 110 (L20>L110). The heat insulating sheet 20 covers the entire indoor side surface 111 of the mullion 110 and the ends 231, 231 of the water retentive films 230 on both sides thereof facing the mullion 110.

[0036] That is, the heat insulating sheet 20 is arranged in the width direction so as to straddle the exterior wall panels 120, 120 on both sides of the mullion 110. In this way, the heat insulating sheet 20, which has insulating properties, is arranged so as to straddle the exterior wall panels 120, 120 on both sides of the mullion 110, making it difficult for heat from the mullion 110 and the exterior wall panel 120 to be transmitted to the inside of the room.

[0037] Because the heat insulating sheet 20 has cushioning properties, it deforms to fit the unevenness of the indoor side surface 111 of the mullion 110 and the water-retaining film 230, and adheres tightly without gaps (see Figure 3). Since gaps are minimized in this way, the heat insulating sheet 20 provides good insulation and improves fire resistance.

[0038] <Water holding bag> The water retention bag 30 is a bag that encases two aluminum hydroxide papers 10, 10 and heat insulating sheets 20, 20, and, like the water retention film 230, retains water generated by the aluminum hydroxide papers 10, 10 with the aluminum hydroxide paper 10 and prevents it from entering the room. The water retention bag 30 is made of, for example, aluminum foil. However, the water retention bag 30 may also be made of, for example, a flame-retardant synthetic resin (such as polyimide).

[0039] In this way, the water retention bag 30 wraps and packages the aluminum hydroxide paper 10 and the insulating sheet 20, so that the water is further retained by the aluminum hydroxide paper 10, i.e., within the fire-resistant coating 1, while further preventing water from entering the interior (leaking to the outside), and making the fire-resistant coating 1 easier to handle.

[0040] <Function and effect of fire-resistant coating> One function and effect of the fire-resistant coating 1 according to this embodiment will be described. Since the aluminum hydroxide paper 10 is placed on the indoor side of the mullions 110, if the mullions 110 are heated by an outdoor (exterior) fire, the heat from the mullions 110 will heat the aluminum hydroxide paper 10, producing water. While water is being produced in this way, the temperatures of the mullions 110, the aluminum hydroxide paper 10, and the heat insulating material are less likely to rise, and heat is less likely to be transmitted to the indoor side through the heat insulating sheet 20, improving fire resistance.

[0041] The insulating sheet 20 having heat insulating properties is arranged so as to straddle the exterior wall panels 120 on both sides of the upright 110, so that heat from the upright 110 and the exterior wall panels 120 is less likely to be transmitted to the indoor side.

[0042] <<Variations>> Although one embodiment of the present invention has been described above, the present invention is not limited to this and may be modified as follows, for example.

[0043] In the above-described embodiment, the fire-resistant coating 1 is configured to include two sheets of aluminum hydroxide paper 10, 10 and two sheets of heat insulating sheet 20, 20, i.e., a configuration including two fire-resistant layers made of aluminum hydroxide paper 10 and heat insulating sheet 20. However, other configurations are also possible, for example, including one fire-resistant layer or three or more fire-resistant layers. Here, if the number of sheets of aluminum hydroxide paper 10 is large, it becomes more difficult for the fire-resistant coating 1 to increase in temperature.

[0044] In the above embodiment, the metal hydroxide sheet is aluminum hydroxide paper 10 containing aluminum hydroxide as the main component, but it may be a sheet containing other metal hydroxides (magnesium hydroxide, iron hydroxide, etc.) as the main component. The same applies to aluminum hydroxide paper 220.

[0045] In the above embodiment, the structural members (partition members) are aluminum alloy mullions that constitute a metal curtain wall constructed by the knockdown method, but other configurations are also possible, such as units (vertical members) that are constructed by the unit construction method and extend vertically.Furthermore, the structural members may be made of wood.

[0046] In the above-described embodiment, the structural members (partition members) are illustrated as mullions extending vertically, but they may also be horizontal members (mullion members, crosspiece members) extending horizontally. In this case, the fire-resistant covering 1 is attached so as to straddle the horizontal members in the vertical direction.

[0047] In the above-described embodiment, the water-retaining film is a bag-shaped water-retaining bag 30, but other configurations are also possible, for example, in which the water-retaining film is in sheet form and covers the indoor side of the aluminum hydroxide paper 10 on the indoor side or the indoor side of the heat insulating sheet 20 on the indoor side.

[0048] In the above-described embodiment, the fire-resistant coating 200 is exemplified as having two insulating layers (first insulating layer 211 and second insulating layer 212), but it may also have other configurations, such as a one-layer structure or a three-layer or more structure.

[0049] In the above-described embodiment, the structural member is a mullion 110 that constitutes the exterior wall structure 100, but other configurations are also possible, for example, in which the structural member is a wooden pillar placed at the center of a wooden house constructed using a post-and-beam method. In this case, the wooden pillar may be wrapped with the fire-resistant covering 1. Also, the structural member may be a metal pillar placed at the center of a building or other structure. It goes without saying that such configurations are included in the technical scope. [Explanation of symbols]

[0050] 1 Fireproof covering 10 Aluminum hydroxide paper (metal hydroxide sheet) 20 Heat insulating sheet 30 Water retention bag (water retention film) 100 Exterior wall structure 110 Mullion (structural member) 120 exterior wall panels 200 Fireproof coating

Claims

1. A fire-resistant covering attached to a structural member extending in a vertical or horizontal direction and having fire resistance, a metal hydroxide sheet that is disposed on the indoor side of the structural member, contains metal hydroxide as a main component, and generates water when heated; a heat insulating sheet disposed on the indoor side of the metal hydroxide sheet and having heat insulating properties; Equipped with A fire-resistant coating body characterized by:

2. A water-retaining film is provided to cover the heat insulating sheet and to retain water generated by the metal hydroxide sheet in the metal hydroxide sheet. The fire-resistant coating according to claim 1 .

3. The water-retaining film is bag-shaped and encases the metal hydroxide sheet and the heat insulating sheet. The fire-resistant coating according to claim 2 .

4. The heat insulating sheet has cushioning properties. The fire-resistant coating according to any one of claims 1 to 3.

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