JPWO2019078272A1 - Fire protection window - Google Patents

Abstract

It is an object of the present invention to provide a fireproof window capable of reducing thermal cracking. The fire prevention window 100 includes a frame body 40, a support member 30 supported by the frame body 40, and a glass plate 20 joined to the support member 30 by adhesives 32 and 34. Since the entire one main surface 20A of the glass plate 20 is exposed from the frame body 40 with respect to the flame side, the glass plate 20 constitutes an exposed glass plate and can reduce thermal cracking.

Description

The present invention relates to a fireproof window, and more particularly to a fireproof window capable of reducing thermal cracking.

A general window structure is composed of a glass plate and a frame body that supports the glass plate, and is installed in a building or the like. For example, when a fire breaks out in a building, the central part of the glass plate is exposed to radiant heat from a heat source and is heated, so that it expands. On the other hand, since the peripheral portion of the glass plate is covered with a frame, it is not easily exposed to radiant heat, and the temperature is lower than that of the central portion. Therefore, tensile stress acts on the peripheral portion of the glass plate, and the glass plate may be so-called thermal cracked.

Various window structures have been proposed to prevent thermal cracking of the glass plate. For example, Patent Document 1 discloses that the inner member that supports the peripheral surface of the glass plate on the side facing the heat source is set shorter than the side length of the glass plate.

Japanese Patent Application Laid-Open No. 2002-266562

However, in the technique of Patent Document 1, the temperature of the peripheral portion of the inner member of the glass plate supported by the inner member is lower than that of the other portion of the glass plate. Therefore, there is a concern that a temperature difference may occur between the peripheral portion of the inner member of the glass plate and the other portion, causing thermal cracking in the glass plate.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a fireproof window capable of reducing thermal cracking.

One aspect of the present invention is a fireproof window comprising a frame and one or more glass plates having facing main surfaces supported by the frame.
At least one of the glass plates is a fireproof window which is an exposed glass plate in which the entire main surface of one of the glass plates is exposed to the flame side.

According to the present invention, it is possible to provide a fireproof window capable of reducing thermal cracking.

FIG. 1 is a schematic cross-sectional view showing a fire prevention window of the first embodiment. FIG. 2 is a schematic cross-sectional view showing a fire prevention window of a modified example of the first embodiment. FIG. 3 is a schematic cross-sectional view showing a fire protection window of another modified example of the first embodiment. FIG. 4 is a view of the fire prevention window of FIG. 3 as viewed from the fire side. FIG. 5 is a schematic cross-sectional view showing a fire prevention window of another modified example of the first embodiment. FIG. 6 is a schematic cross-sectional view showing the fire protection window of the second embodiment. FIG. 7 is a schematic cross-sectional view showing a fire prevention window of a modified example of the second embodiment. FIG. 8 is a schematic cross-sectional view showing a fire protection window of another modified example of the second embodiment. FIG. 9 is a view of the fire prevention window of FIG. 8 as viewed from the side opposite to the fire side.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. The present invention can be modified in various ways without departing from the scope of the present invention, and can include other embodiments other than the embodiments, and these other embodiments are also included in the claims. ..
In the following figures, the parts indicated by the same symbols are similar elements having the same functions.

<First Embodiment>
The fire protection window of the first embodiment will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing a fire protection window of the embodiment. Fire protection windows are provided with at least one glass plate and are installed in buildings such as houses and buildings.

The fire prevention window 100 has a glass plate 20 and a frame body 40 that supports the glass plate 20. The glass plate 20 has a plate shape having a main surface 20A and a main surface 20B facing each other, and an end surface 20C connected to the main surface 20A and the main surface 20B. The support includes the case where the frame body 40 is directly and indirectly supported.

In the first embodiment, the glass plate 20 is indirectly supported by the frame body 40 via the support member 30. The support member 30 has a crank shape in cross-sectional view. The crank shape is a shape having at least two bent portions and extending in different directions from each other at the two bent portions. The support member 30 includes a first portion 30A, a second portion 30B, and a third portion 30C. The first portion 30A and the third portion 30C extend in different directions at the bent portion with respect to the second portion 30B. The support member 30 preferably has a structure in which the first portion 30A, the second portion 30B, and the third portion 30C are integrally molded. However, it is not limited to integral molding. FIG. 1 shows an example in which the support member 30 has a crank shape. The shape of the support member 30 is not particularly limited. The support member 30 is preferably formed of, for example, a metal (including an alloy) such as aluminum or iron.

As shown in FIG. 1, the main surface 20B of the glass plate 20 is joined to the first portion 30A of the support member 30 via the adhesive 32. The end face 20C of the glass plate 20 is joined to the second portion 30B of the support member 30 via the adhesive 34. One main surface 20A of the glass plate 20 is not joined to the support member 30.

The frame body 40 has a groove 41 on the inner peripheral side. The inner peripheral side means the side on which the glass plate 20 is arranged. The third portion 30C of the support member 30 is housed in the groove 41 of the frame body 40. The groove width of the groove 41 may be larger than the thickness of the third portion 30C of the support member 30. The frame body 40 can support the support member 30 via the cushioning material 44. The frame 40 is preferably formed of a metal (including an alloy) such as aluminum or iron, or a resin.

It is preferable to use rubber, silicone sealant, or foamed resin as the cushioning material 44.
As shown in FIG. 1, the cushioning materials 44 all have the same shape, but the shape can be changed according to the position arranged in the groove 41.

In the first embodiment, the side of one main surface 20A of the glass plate 20 is the flame side. As shown in FIG. 1, the entire main surface 20A of the glass plate 20 is exposed from the frame body 40 with respect to the flame side, and the glass plate 20 constitutes an exposed glass plate. Exposed means that the frame body 40 and the glass plate 20 do not overlap when viewed from the flame side.

In the fire prevention window 100 of the first embodiment, the main surface 20A of the glass plate 20 is exposed from the frame body 40. When a fire or the like occurs in the building where the fire prevention window 100 is installed, the glass plate 20 is exposed to radiant heat. On the side of the main surface 20A of the glass plate 20, both the central portion and the peripheral portion of the glass plate 20 are exposed to radiant heat. Since a temperature difference is unlikely to occur between the central portion and the peripheral portion of the glass plate 20, tensile stress does not act on the peripheral portion of the glass plate 20, and it is possible to suppress the occurrence of thermal cracking in the glass plate 20.

The thickness of the glass plate 20 is, for example, preferably 2 mm or more and 19 mm or less, more preferably 3 mm or more and 12 mm or less, and further preferably 5 mm or more and 10 mm or less. When the thickness of the glass plate 20 is 2 mm or more, the glass plate 20 is not easily broken, which is preferable. It is preferable that the thickness of the glass plate 20 is 19 mm or less because it is lightweight.

Next, the fire prevention window 101 of the modified example of the first embodiment will be described with reference to FIG. The same components as those in FIG. 1 are designated by the same reference numerals, and the description thereof will be omitted.
The fire prevention window 101 includes a laminated glass 21 instead of the glass plate 20 of the fire prevention window 100. In the laminated glass 21, the glass plate 22 and the glass plate 23 are joined via an interlayer film 24. As shown in FIG. 2, the glass plate 22 of the laminated glass 21 is arranged on the fire side.

The glass plate 22 has a main surface 22A, a main surface 22B, and an end surface 22C that face each other. The glass plate 23 has a main surface 23A, a main surface 23B, and an end surface 23C that face each other. The main surface 22B of the glass plate 22 and the main surface 23A of the glass plate 23 are joined by the interlayer film 24.

The thickness of the glass plate 22 and the glass plate 23 is, for example, preferably 2 mm or more and 15 mm or less, more preferably 3 mm or more and 12 mm or less, and further preferably 5 mm or more and 10 mm or less. When the thickness of the glass plate 22 and the glass plate 23 is 2 mm or more, it is preferable because it is hard to break. When the thickness of the glass plate 22 and the glass plate 23 is 19 mm or less, the weight is preferable.

The thickness of the interlayer film 24 is, for example, preferably 0.1 mm or more and 3 mm or less, more preferably 0.3 mm or more and 2 mm or less, and further preferably 0.4 mm or more and 1 mm or less. When the thickness of the interlayer film 24 is 0.1 mm or more, the interlayer film 24 is preferable because it stably adheres the glass plate 22 and the glass plate 23. Further, when the thickness of the interlayer film 24 is 3 mm or less, it is inexpensive and the distortion of the transmitted image can be suppressed, which is preferable.

The main surface 23B of the glass plate 23 is joined to the first portion 30A of the support member 30 via the adhesive 32. The end surface 22C of the glass plate 22 and the end surface 23C of the glass plate 23 are joined to the second portion 30B of the support member 30 via the adhesive 34. One main surface 22A of the glass plate 22 and one main surface 23A of the glass plate 23 are not joined to the support member 30.

As shown in FIG. 2, the main surface 22A of the glass plate 22 and the main surface 23A of the glass plate 23 are exposed from the frame 40 with respect to the flame side, and the glass plate 22 and the glass plate 23 are exposed. , Consists of an exposed glass plate.

When the laminated glass 21 is exposed to radiant heat, both the central portion and the peripheral portion of the glass plate 22 are exposed to radiant heat on the side of the main surface 22A of the glass plate 22. Since a temperature difference is unlikely to occur between the central portion and the peripheral portion of the glass plate 22, tensile stress does not act on the peripheral portion of the glass plate 22, and it is possible to suppress the occurrence of thermal cracking in the glass plate 22. The shape of the glass plate 22 is maintained.

Further, since the radiant heat passes through the glass plate 22 on the side of the main surface 23A of the glass plate 23, both the central portion and the peripheral portion of the glass plate 23 are exposed to the radiant heat. Since a temperature difference is unlikely to occur between the central portion and the peripheral portion of the glass plate 23, tensile stress does not act on the peripheral portion of the glass plate 23, and it is possible to suppress the occurrence of thermal cracking in the glass plate 23. The shape of the glass plate 23 is maintained. Since the glass plate 23 is joined to the glass plate 22 by the interlayer film 24 and the shape of the glass plate 23 is maintained, it is possible to prevent the glass plate 23 from falling from the fire prevention window 101.

Next, the fire protection window 102 of another modification of the first embodiment will be described with reference to FIGS. 3 and 4. The same components as those in FIGS. 1 and 2 are designated by the same reference numerals, and the description thereof will be omitted. The fireproof window 102 includes a laminated glass 21 like the fireproof window 101. In the laminated glass 21, the glass plate 22 and the glass plate 23 are joined via an interlayer film 24. As shown in FIG. 3, the interlayer film 24 of the fire prevention window 102 is provided with a metal wire 25 for preventing falling. As the metal of the wire 25, stainless steel (SUS), iron or the like can be used.

FIG. 4 is a view of the fire prevention window 102 as viewed from the fire side. The wire 25 is arranged along the width direction of the glass plate 22. The length of the wire 25 is longer than the width of the laminated glass 21, and is fixed to the frame 40 by the fastener 26. Even when the adhesive 32 (not shown) for joining the support member 30 and the laminated glass 21 and the adhesive 34 are softened, the wire 25 can more reliably prevent the laminated glass 21 from falling from the fireproof window 102.

The wires 25 are provided at two locations above and below the laminated glass 21, but the number and positions of the wires 25 are not particularly limited.

In the fire prevention window 102, the case where the wire 25 is arranged on the interlayer film 24 of the laminated glass 21 is shown, but the wire 25 can be provided on the glass plate 20 of the fire prevention window 100. For example, the wire 25 can be adhered to either the main surface 20A or the main surface 20B of the glass plate 20 with an adhesive or the like. It can be fixed to the frame body 40 by the fasteners provided at both ends of the wire 25. Since the wire diameter of the wire 25 (for example, the wire diameter is 0.5 mm or more and 1 mm or less) is small, even if the wire 25 is provided on the main surface 20A of the glass plate 20, the amount of heat of radiant heat exposed to the glass plate 20 is affected. ,rare. Therefore, the temperature difference due to the wire 25 hardly occurs between the central portion and the peripheral portion of the glass plate 20.

Next, the fire protection window 103 of another modification of the first embodiment will be described with reference to FIG. The same configurations as those in FIGS. 1 to 4 are designated by the same reference numerals, and the description thereof will be omitted. The fireproof window 103 is provided with a laminated glass 21 like the fireproof window 101. In the laminated glass 21, the glass plate 22 and the glass plate 23 are joined via an interlayer film 24. As shown in FIG. 5, unlike the fire prevention window 101, the fire prevention window 103 has a support frame body 50 in which the frame body and the support member are integrated. The support frame body 50 has a function as a frame body.

The support frame body 50 includes a support surface 50A and a support surface 50B that are orthogonal to each other. The main surface 23B of the glass plate 23 is joined to the support surface 50A via the adhesive 32. The end surface 22C of the glass plate 22 and the end surface 23C of the glass plate 23 are joined to the support surface 50B of the support frame 50 via the adhesive 34. One main surface 22A of the glass plate 22 is not joined to the support frame body 50.

As shown in FIG. 5, the main surface 22A of the glass plate 22 and the main surface 23A of the glass plate 23 are exposed from the support frame 50 with respect to the flame side, and the glass plate 22 and the glass plate 23 are exposed. Consists of an exposed glass plate. With this configuration, thermal cracking of the glass plate 22 and the glass plate 23 can be prevented. Further, the support frame body 50 is preferable because the frame body and the support member are integrated, so that the attachment of the support frame body 50 can be simplified, and the number of members used can be reduced, so that the cost is low. ..

<Second embodiment>
The fire protection window of the second embodiment will be described with reference to the drawings. Similar to the first embodiment, the fireproof window of the second embodiment includes at least one glass plate and is installed in a building such as a house or a building. FIG. 6 is a cross-sectional view showing the fire protection window of the second embodiment. The fireproof window 200 has a frame body 40, a glass plate 60 whose peripheral edge portion is supported by the frame body 40, and a glass plate 62 joined to the glass plate 60 via an interlayer film 63. The glass plate 60 has a plate shape having a main surface 60A and a main surface 60B facing each other, and an end surface 60C connected to the main surface 60A and the main surface 60B. The glass plate 62 has a plate shape having a main surface 62A and a main surface 62B facing each other, and an end surface 62C connected to the main surface 62A and the main surface 62B.

The thickness of the glass plate 60 is, for example, preferably 3 mm or more and 19 mm or less, more preferably 4 mm or more and 12 mm or less, and further preferably 5 mm or more and 10 mm or less. When the thickness of the glass plate 60 is 3 mm or more, it is preferable because it is hard to break. It is preferable that the thickness of the glass plate 60 is 19 mm or less because it is lightweight. The thickness of the glass plate 62 is, for example, preferably 2 mm or more and 12 mm or less, more preferably 3 mm or more and 10 mm or less, and further preferably 4 mm or more and 6 mm or less. When the thickness of the glass plate 62 is 3 mm or more, it is preferable because it is hard to break. It is preferable that the thickness of the glass plate 62 is 19 mm or less because it is lightweight.
The ratio A / B of the thickness A of the glass plate 60 to the thickness B of the glass plate 62 is preferably 1.0 or more and 5.0 or less. When the A / B is 1.0 or more and 5.0 or less, the glass plates 60 and 62 are hard to break, and the fireproof window can be made lightweight. A / B is more preferably 1.5 or more. Further, the A / B is more preferably 3.0 or less, and further preferably 2.0 or less.

The thickness of the interlayer film 63 is, for example, preferably 0.1 mm or more and 3 mm or less, more preferably 0.3 mm or more and 2 mm or less, and further preferably 0.4 mm or more and 1 mm or less. When the thickness of the interlayer film 63 is 0.1 mm or more, the interlayer film 63 is preferable because it stably adheres the glass plate 60 and the glass plate 62. Further, when the thickness of the interlayer film 63 is 3 mm or less, it is inexpensive and the distortion of the transmitted image can be suppressed, which is preferable.

The frame body 40 has a groove 41 on the inner peripheral side. The peripheral portion of the glass plate 60 is housed in the groove 41 of the frame body 40. The groove width of the groove 41 may be larger than the thickness of the peripheral edge portion of the glass plate 60. The frame body 40 can support the peripheral portion of the glass plate 60 via the cushioning material 44. The cushioning material 44 is arranged between the main surface 60A of the glass plate 60 and the frame body 40, and between the main surface 62B of the glass plate 62 and the frame body 40.

As shown in FIG. 6, the glass plate 60 is arranged on the fire side. Since the peripheral edge portion of the glass plate 60 is directly supported by the frame body 40, the peripheral edge portion of the main surface 60A of the glass plate 60 is not exposed from the frame body 40 with respect to the flame side.

As shown in FIG. 6, the main surface 60B of the glass plate 60 and the main surface 62A of the glass plate 62 are arranged to face each other, and the glass plate 62 is arranged on the side opposite to the fire side. Since the glass plate 62 is not supported by the frame body 40, one main surface 62A of the glass plate 62 is exposed from the frame body 40 with respect to the flame side. The glass plate 62 constitutes an exposed glass plate.

When a fire or the like occurs in the building in which the fire prevention window 200 of the second embodiment is installed, the glass plate 60 and the glass plate 62 are exposed to radiant heat. On the side of the main surface 60A of the glass plate 60, the central portion of the glass plate 60 is exposed to radiant heat, and the peripheral portion is not exposed to radiant heat by the frame body 40. A temperature difference may occur between the central portion and the peripheral portion of the glass plate 60, and the glass plate 60 may be thermally cracked.

On the other hand, on the side of the main surface 62A of the glass plate 62, since the radiant heat passes through the glass plate 60, both the central portion and the peripheral portion of the glass plate 62 are exposed to the radiant heat. Since a temperature difference is unlikely to occur between the central portion and the peripheral portion of the glass plate 62, tensile stress does not act on the peripheral portion of the glass plate 62, and it is possible to suppress the occurrence of thermal cracking in the glass plate 62.

Since the glass plate 62 does not undergo thermal cracking, the glass plate 62 can maintain its shape. The glass plate 62 is joined to the glass plate 60 by the interlayer film 63, and the shape of the glass plate 62 is maintained. Therefore, even if the glass plate 60 is thermally cracked, the glass plate 62 whose shape is maintained covers almost the entire surface of the thermally cracked glass plate 60 to the end, so that the glass plate 60 is shattered. Therefore, it is possible to prevent the glass plate 60 and the glass plate 62 from falling from the fire prevention window 200.

The fireproof window 200 may include at least a glass plate constituting an exposed glass plate, and not all the glass plates need to be exposed glass plates.

Next, the fire prevention window 201 of the modified example of the second embodiment will be described with reference to FIG. 7. The same configurations as in FIG. 6 are designated by the same reference numerals and the description thereof will be omitted. The fireproof window 201 includes a laminated glass 70 instead of the glass plate 60 of the fireproof window 200. The glass plate 62 is joined to the laminated glass 70 via the interlayer film 63.

In the laminated glass 70, the glass plate 72 and the glass plate 73 are joined via an interlayer film 74. As shown in FIG. 7, the glass plate 72 of the laminated glass 70 is arranged on the fire side.

The thickness of the glass plate 72 and the glass plate 73 is, for example, preferably 2 mm or more and 15 mm or less, more preferably 3 mm or more and 12 mm or less, and further preferably 5 mm or more and 10 mm or less. When the thickness of the glass plate 72 and the glass plate 73 is 2 mm or more, it is preferable because it is hard to break. When the thickness of the glass plate 72 and the glass plate 73 is 15 mm or less, the weight is preferable.

The thickness of the interlayer film 74 is, for example, preferably 0.1 mm or more and 3 mm or less, more preferably 0.3 mm or more and 2 mm or less, and further preferably 0.4 mm or more and 1 mm or less. When the thickness of the interlayer film 74 is 0.1 mm or more, the interlayer film 74 is preferable because it stably adheres the glass plate 72 and the glass plate 73. Further, when the thickness of the interlayer film 74 is 3 mm or less, it is inexpensive and the distortion of the transmitted image can be suppressed, which is preferable.

The glass plate 72 has a main surface 72A, a main surface 72B, and an end surface 72C that face each other. The glass plate 73 has a main surface 73A, a main surface 73B, and an end surface 73C that face each other. The main surface 72B of the glass plate 72 and the main surface 73A of the glass plate 73 are joined by the interlayer film 74.

The peripheral portion of the laminated glass 70 is housed in the groove 41 of the frame body 40. The groove width of the groove 41 may be larger than the thickness of the peripheral edge portion of the laminated glass 70. The frame body 40 can support the peripheral portion of the laminated glass 70 via the cushioning material 44. The cushioning material 44 is arranged between the main surface 72A of the glass plate 72 and the frame body 40, and between the main surface 73B of the glass plate 73 and the frame body 40.

Since the peripheral portion of the laminated glass 70 is directly supported by the frame body 40, the peripheral portion of the main surface 72A of the glass plate 72 and the peripheral portion of the main surface 73A of the glass plate 73 are framed with respect to the flame side. Not exposed from 40.

As shown in FIG. 7, the main surface 73B of the glass plate 73 and the main surface 62A of the glass plate 62 are arranged to face each other, and the glass plate 62 is arranged on the side opposite to the fire side. Further, since the glass plate 62 is not supported by the frame body 40, one main surface 62A of the glass plate 62 is exposed from the frame body 40. The glass plate 62 constitutes an exposed glass plate.

When a fire or the like occurs in the building where the fire prevention window 201 is installed, the laminated glass 70 and the glass plate 62 are exposed to radiant heat. On the side of the main surface 72A of the glass plate 72 constituting the laminated glass 70, the central portion of the glass plate 72 is exposed to radiant heat, and the peripheral portion is not exposed to radiant heat by the frame body 40. Similarly, on the side of the main surface 73A of the glass plate 73, the central portion of the glass plate 73 is exposed to radiant heat, and the peripheral portion is not exposed to radiant heat by the frame body 40. Thermal cracks may occur in the glass plate 72 and the glass plate 73.

On the other hand, since the laminated glass 70 transmits radiant heat on the side of the main surface 62A of the glass plate 62, both the central portion and the peripheral portion of the glass plate 62 are exposed to the radiant heat. Since a temperature difference is unlikely to occur between the central portion and the peripheral portion of the glass plate 62, tensile stress does not act on the peripheral portion of the glass plate 62, and it is possible to suppress the occurrence of thermal cracking in the glass plate 62.

Since the glass plate 62 does not undergo thermal cracking, the glass plate 62 can maintain its shape. The glass plate 62 is joined to the laminated glass 70 by an interlayer film 63, and the shape of the glass plate 62 is maintained. Therefore, even if the laminated glass 70 is thermally cracked, the glass plate 62 that maintains its shape covers almost the entire surface of the laminated glass 70 that has been thermally cracked to the end, so that the laminated glass 70 is shattered. Instead, the laminated glass 70 and the glass plate 62 can be prevented from falling from the fireproof window 200.

Next, the fire prevention window 202 of the modified example of the second embodiment will be described with reference to FIGS. 8 and 9. The same components as those in FIGS. 6 and 7 are designated by the same reference numerals and the description thereof will be omitted. The fireproof window 202 has a laminated glass 70 like the fireproof window 201 of the modified example of the second embodiment. On the other hand, the fire prevention window 202 is provided with a fall prevention member 80.

As shown in FIG. 8, the member 80 is provided on the side of the other main surface 62B of the glass plate 62 and on the frame body 40. The member 80 is fixed to the frame body 40. The member 80 is made of metal, for example. As shown in FIG. 9, the member 80 is arranged at the four corners of the glass plate 62 on the main surface 62B side. As the metal of the member 80, stainless steel (SUS), iron, or the like can be used.

When a fire or the like occurs in the building in which the fire prevention window 201 is installed, even if the interlayer film 63 softens, the member 80 can more reliably prevent the glass plate 62 from falling from the fire prevention window 202. The number of members 80 and the positions where they are provided are not particularly limited as long as they can be prevented from falling. Since the member 80 is arranged on the side of the main surface 62B, it does not block the radiant heat on the side of the main surface 62A. A temperature difference is unlikely to occur between the central portion and the peripheral portion of the glass plate 62, and thermal cracking of the glass plate 62 can be suppressed.

As the glass plate used in the first embodiment and the second embodiment, tempered glass can be mentioned. The tempered glass refers to a glass plate having a compressive stress layer formed on the surface of the glass plate and a tensile stress layer formed inside the glass plate. The tempered glass is preferably chemically tempered glass or air-cooled tempered glass. The chemically strengthened glass is a glass obtained by a chemically strengthened treatment such as an ion exchange method. In the case of the chemical strengthening treatment, the value of the surface compressive stress generated in the front surface layer and the back surface layer can be increased even if the glass plate is thin. In wind-cooled tempered glass, a glass plate having a temperature near the softening point is rapidly cooled from both sides, and a temperature difference is created between the front and back surfaces of the glass plate and the inside of the glass plate to create a temperature difference between the front surface and the back surface of the glass plate. Surface compressive stress can be generated in the layer.

The glass applied to the glass plate of the embodiment has SiO ₂ of 56% or more and 75% or less, Al ₂ O ₃ of 0% or more and 20% or less, and Na ₂ O of 8% or more of 22 in terms of molar percentage display based on oxides. % Or less, K ₂ O is preferably 0% or more and 10% or less, MgO is 0% or more and 14%, ZrO ₂ is 0% or more and 5%, and CaO is 0% or more and 12% or less. Hereinafter, each component will be described, and% means mol%.

SiO ₂ (silicon dioxide) is known as a component that forms a network structure in the glass microstructure, and is a main component that constitutes glass. The content of SiO ₂ is 56% or more, preferably 63% or more, more preferably 66% or more, still more preferably 68% or more. The content of SiO ₂ is 75% or less, preferably 73% or less, and more preferably 72% or less. When the content of SiO ₂ is 56% or more, it is superior in terms of stability and weather resistance as glass. On the other hand, when the content of SiO ₂ is 75% or less, it is superior in terms of meltability and moldability.

Although Al ₂ O ₃ is not essential, it may be contained because it has an effect of improving the ion exchange performance in chemical strengthening, and particularly has a large effect of improving surface compressive stress (CS). Al ₂ O ₃ is also known as a component that improves the weather resistance of glass. In addition, it has the effect of suppressing the infiltration of tin from the bottom surface during float molding. When Al ₂ O ₃ is contained, it is 0.4% or more, preferably 0.6% or more, and more preferably 0.8% or more. The content of Al ₂ O ₃ is 20% or less, preferably 10% or less, more preferably 5% or less, still more preferably 3% or less, and particularly preferably 2% or less. When the content of Al ₂ O ₃ is 0.4% or more, the desired CS can be obtained by ion exchange, and the effect of suppressing the infiltration of tin can be obtained. On the other hand, when the content of Al ₂ O ₃ is 20% or less, the devitrification temperature does not rise significantly even when the viscosity of the glass is high, which is advantageous in terms of melting and molding in the soda lime glass production line. ..

The total content of SiO ₂ and Al ₂ O ₃ (SiO ₂ + Al ₂ O ₃ ) is preferably 80% or less. If it exceeds 80%, the viscosity of the glass at a high temperature may increase and melting may become difficult, preferably 76% or less, more preferably 74% or less. Further, SiO ₂ + Al ₂ O ₃ is preferably 68% or more. If it is less than 68%, the crack resistance at the time of indentation is lowered, and more preferably 70% or more.

Na ₂ O is an essential component for forming a compressive stress layer by ion exchange, and has an action of deepening the depth of layer (DOL) of the compressive stress layer. It is also a component that lowers the high-temperature viscosity and devitrification temperature of glass and improves the meltability and moldability of glass. The content of Na ₂ O is 8% or more, preferably 10% or more, and more preferably 12% or more. The Na ₂ O content is 22% or less, preferably 16% or less, and more preferably 14% or less. When the Na ₂ O content is 8% or more, a desired compressive stress layer can be formed by ion exchange. In addition, sufficient solubility and moldability can be obtained. On the other hand, when the Na ₂ O content is 22% or less, sufficient weather resistance can be obtained.

Although K ₂ O is not essential, it may be contained because it has the effect of increasing the ion exchange rate and deepening the DOL. On the other hand, if K ₂ O is too large, sufficient CS cannot be obtained. When K ₂ O is contained, it is preferably 10% or less, preferably 2% or less, and more preferably 1% or less. When the content of K ₂ O is 10% or less, sufficient CS can be obtained.

MgO is not essential, but it is a component that stabilizes glass. The content of MgO is 2% or more, preferably 4% or more, and more preferably 6% or more. The MgO content is 14% or less, preferably 10% or less, and more preferably 8% or less. When the content of MgO is 2% or more, the chemical resistance of the glass becomes good. Meltability at high temperature is improved, and devitrification is less likely to occur. On the other hand, when the MgO content is 14% or less, the resistance to devitrification is maintained and a sufficient ion exchange rate can be obtained.

Although ZrO ₂ is not essential, it is generally known to have an effect of increasing the surface compressive stress in chemical strengthening. However, even if a small amount of ZrO ₂ is contained, the effect is not great for the cost increase. Therefore, any proportion of ZrO ₂ can be contained as the cost allows. When it is contained, it is preferably 5% or less, more preferably 3% or less, still more preferably 1% or less.

CaO is not essential, but it is a component that stabilizes glass. Since CaO tends to inhibit the exchange of alkaline ions, it is preferable to reduce or not contain it, especially when it is desired to increase the DOL. On the other hand, in order to improve chemical resistance, it is preferably contained in an amount of 2% or more, preferably 5% or more, and more preferably 7% or more. When CaO is contained, the amount is 12% or less, preferably 10% or less, and more preferably 9% or less. When the CaO content is 10% or less, a sufficient ion exchange rate is maintained and a desired DOL can be obtained.

Although SrO is not essential, it may be contained for the purpose of lowering the high temperature viscosity of the glass and lowering the devitrification temperature. Since SrO has an effect of lowering the ion exchange efficiency, it is preferable not to contain it especially when it is desired to increase the DOL. The amount of SrO when contained is 3% or less, preferably 2% or less, and more preferably 1% or less.

BaO is not essential, but may be contained for the purpose of lowering the high temperature viscosity of the glass and lowering the devitrification temperature. Since BaO has an action of increasing the specific gravity of glass, it is preferable not to contain it when the intention is to reduce the weight. The amount of BaO when contained is 3% or less, preferably 2% or less, and more preferably 1% or less.

TiO ₂ is abundant in natural raw materials and is known to be a source of yellow coloring. The content of TiO ₂ is 0.3% or less, preferably 0.2% or less, and more preferably 0.1% or less. When the content of TiO ₂ exceeds 0.3%, the glass becomes yellowish.

The chemically strengthened glass may contain other components. The total content of the other components is preferably 5% or less, more preferably 3% or less, and typically 1% or less. Hereinafter, the above other components will be described exemplary.

ZnO may be contained, for example, up to 2% in order to improve the meltability of the glass at a high temperature. However, when it is produced by the float method, it is preferably not contained because it is reduced by the float bath and becomes a product defect.

B ₂ O ₃ may be contained in the range of less than 1% in order to improve the meltability at high temperature or the glass strength. In general, if the alkaline component of Na ₂ O or K ₂ O and B ₂ O ₃ are contained at the same time, volatilization becomes intense and the bricks are significantly eroded. Therefore, it is preferable that B ₂ O ₃ is not substantially contained. .. In addition, in this specification, "substantially not contained" means that it is not contained other than unavoidable impurities mixed from raw materials and the like, that is, it is not intentionally contained.

Li ₂ O is a component that lowers the strain point to facilitate stress relaxation, and as a result, stable compressive stress cannot be obtained. Therefore, it is preferable not to contain Li ₂ O, and even if it is contained, its content is 1. It is preferably less than%, more preferably 0.05% or less, and particularly preferably less than 0.01%.

The interlayer films 24, 63, 74 are preferably composed of a thermoplastic resin, a thermosetting resin, an ultraviolet curable resin, or the like. As resin materials constituting the interlayer films 24, 63, 74, ionomer resin, ethylene-vinyl acetate copolymer (EVA), polyvinyl butyral (PVB), polyurethane resin, polyvinyl chloride, cellulose diacetate, cellulose triacetate, silicone Examples include based resins.

The area of the main surface of the glass plates 20, 22, 23, 60, 62, 72, 73 is preferably 0.1 m ² or more and 10 m ² or less, for example. When the area of the main surface is 0.1 m ² or more, it is suitably used as a fire prevention window installed for various purposes such as buildings. The area of the main surface may be 1 m ² or more, 2 m ² or more, 3 m ² or more, 5 m ² or more, or 7 m ² or more. .. Further, if the area of the main surface is 10 m ² or less, the glass plates 20, 22, 23, 60, 62, 72, 73 can be easily handled, for example, the glass plates 20, 22, 23, 60, 62, 72. , 73 can be prevented from being damaged due to contact with peripheral members during installation. The area of the main surface may be 9 m ² or less, or 8 m ² or less.

The entire contents of the specification, claims, drawings, and abstract of Japanese Patent Application No. 2017-203147 filed on October 20, 2017 are cited here as disclosure of the specification of the present invention. , Incorporate.

20, 22, 23: Glass plate, 20A, 20B, 22A, 22B, 23A, 23B: Main surface, 20C, 22C, 23C: End face, 21: Laminated glass, 24: Intermediate film, 25: Wire, 26: Fastener , 30: Support member, 30A: 1st part, 30B: 2nd part, 30C: 3rd part, 32, 34: Adhesive, 40: Frame, 41: Groove, 44: Buffer material, 50: Support frame , 50A, 50B: Support surface, 60, 62: Glass plate, 60A, 60B, 62A, 62B: Main surface, 60C, 62C: End surface, 63: Intermediate film, 70: Laminated glass, 72, 73: Glass plate, 72A , 72B, 73A, 73B: Main surface, 72C, 73C: End surface, 74: Laminated glass, 80: Member, 100, 101, 102, 103, 200, 201, 202: Fire protection window

Claims (13)

A fireproof window comprising a frame and one or more glass plates having facing main surfaces supported by the frame.
A fireproof window in which at least one of the glass plates is an exposed glass plate in which the entire main surface of one of the glass plates is exposed to the flame side. The fire prevention window according to claim 1, wherein the exposed glass plate is supported by the frame body via a support member. The fire prevention window according to claim 1 or 2, wherein the glass plate is a single plate. The fireproof window according to claim 1 or 2, further comprising a glass plate bonded to the exposed glass plate via an interlayer film. The fireproof window according to claim 4, wherein the interlayer film is a film of a thermoplastic resin, a thermosetting resin, or an ultraviolet curable resin. The fireproof window according to any one of claims 2 to 5, further comprising a metal wire for fall prevention provided on the glass plate. The fire prevention window according to claim 6, wherein the end of the fall prevention metal wire is fixed to a frame body. The fireproof window according to claim 1, further comprising a glass plate bonded to the exposed glass plate via an interlayer film, and the glass plate is supported by the frame body. The fireproof window according to claim 8, wherein the glass plate is laminated glass. The fire prevention window according to claim 8 or 9, which is on the other main surface side of the exposed glass plate and has a fall prevention member provided on the frame body. The fire protection window according to claim 10, wherein the member is arranged at four corners on the other main surface side of the exposed glass plate. The glass plate contains SiO ₂ of 56% or more and 75% or less, Al ₂ O ₃ of 0% or more and 20% or less, Na ₂ O of 8% or more and 22% or less, and K ₂ O in an oxide-based molar percentage display. The invention according to any one of claims 1 to 11, which comprises glass containing 0% or more and 10% or less, MgO 0% or more and 14%, ZrO ₂ as 0% or more and 5%, and CaO as 0% or more and 12% or less. Fireproof window. The fireproof window according to any one of claims 1 to 12, wherein the glass plate is chemically tempered glass or air-cooled tempered glass.

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