JP2000109349A - Double-glazing unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To inexpensively provide the double-glazing unit exhibiting high fire resistant properties while maintaining conventional resistance to moisture. SOLUTION: Plural sheet glasses 1 and 2 are laminated in such a manner that a spacer 3 is interposed over whole periphery of the sheet glasses so as to form a space in the thickness direction. Further, a seal layer is interposed between the plural sheet glasses 1 and 2 and the spacer 3 so as to form an enclosed space A between the plural sheet glasses 1 and 2. The first sheet glass 1 of the plural sheet glasses, which is present at the outside of the room, is constituted of heat-strengthened glass or the sheet glass having a lower heat- strengthening degree than that of the heat-strengthened glass and the second sheet glass 2, which is preset at the inside of the room, is constituted of the sheet glass having a higher heat-strengthening degree than that of the heat- strengthened glass.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a laminated glass plate comprising a plurality of glass sheets laminated at intervals in the thickness direction via spacers around the entire periphery thereof, and a sealing layer is interposed between the glass sheets and the spacers. Further, the present invention relates to a double glazing in which a closed space is formed between the plurality of plate glasses.

[0002]

2. Description of the Related Art Conventionally, in order to improve the fire prevention performance against a fire from the outside, the double glazing is simply used to form a sealed space by sealing between the glass sheets. It has been conceived that the plate glass of (1) is made of fireproof glass made of meshed plate glass, and the plate glass on the indoor side is made of ordinary float glass.

[0003]

However, usually, in order to form a sealed space by sealing between the glass sheets, a sealing layer is formed between the glass sheets by using butyl rubber or the like. Therefore, when exposed to high heat such as a fire occurs in a space outside the room partitioned by the double-glazed glass, a flammable gas is generated from the seal layer, and a flammable gas is generated in the closed space. When the glass sheet is filled, and the sheet glass on the indoor side of the double glazing is cracked by the high heat, a high concentration of flammable gas leaks out of the cracks and flows out into the indoor space partitioned by the double glazing. At the same time, it may ignite in contact with a large amount of fresh air, causing the fire to spread to the indoor space or spread to the seal layer, causing fire to spread. Because there is, much higher fire performance has been desired.

Therefore, it is conceivable that both the outdoor side glass sheet and the indoor side glass sheet of the plurality of glass sheets are made of fireproof glass. However, plate glass referred to as fireproof glass is generally expensive, such as heat-resistant crystallized glass, low-expansion fireproof glass, and heat-resistant tempered glass (particularly, high heat-strength with a surface compressive stress of 1700 kg / cm ² or more), as well as netted glass. There is a disadvantage that the cost is increased as a whole.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a double-glazing system that exhibits high fire-protection performance at low cost while maintaining the conventional moisture-proof properties in view of the above-mentioned circumstances.

[0006]

Means for Solving the Problems (Structure) In order to achieve this object, a characteristic structure of the present invention is that, out of a plurality of sheet glasses, the first sheet glass on the outdoor side is made of a double-strength glass or a double-strength glass. The second sheet glass on the indoor side is formed of a sheet glass having a higher degree of thermal strengthening than the double-strength glass, while being formed of a sheet glass having a lower degree of strengthening.
The double strength glass has a surface compression stress of 200 kg / c.
m ² or more and may if it is implemented in the 600 kg / cm ² or less reinforcing degrees, also the second glass sheet, it is implemented in the surface compressive stress 1200 kg / cm ² or more and 1700 kg / cm ² less than the enhanced degree It suffices if a heat ray reflective film is provided on at least one surface of the first glass sheet and the second glass sheet, and the operation and effect are as follows.

(Operation) In other words, the first outdoor glass sheet of the plurality of glass sheets is made of double-strength glass or a sheet glass having a lower degree of thermal strengthening than double-strength glass.
Even if the double glazing is heated due to an outdoor fire, etc., the first glass sheet is not only difficult to break, but even if it breaks, the sheet glass with a higher degree of heat strengthening suddenly breaks into smaller pieces and falls off the holding frame. There is no such thing as being broken, and it is easily broken like a normal sheet glass and remains on the holding frame. Therefore, it is difficult to form a large opening, exhibits a heat shielding effect on the second glass sheet on the indoor side, and makes the second glass sheet more effective than the double-strength glass without using the high heat-strengthened glass sheet used in the fire prevention glass. However, if the sheet glass has a high degree of thermal strengthening, cracking due to fire is unlikely to occur. Therefore, even if a flammable gas is generated from the sealing layer due to high heat and the flammable gas is filled in the closed space, the second glass sheet withstands high heat and the flammable gas is removed from the indoor space. To make it hard to leak to

(Effect of the Invention) Accordingly, the double-glazing of the present invention can be used as a window glass or a door, which can improve fire prevention performance by using an inexpensive plate glass as a whole, and is unlikely to be burnt even if a fire occurs. It is useful for disaster prevention.

In addition, the double-strength glass and the second glass sheet can be made thinner than the fire-resistant glass, so that the weight can be reduced as a whole. In addition, since a glass sheet having a higher degree of thermal strengthening than the double-strength glass is adopted as the second glass sheet on the indoor side, safety against external force on the indoor side is also improved.
The double-strength glass has a surface compression stress of 200 kg / cm ^2.
If it is made of a material having the above-mentioned strength set to 600 kg / cm ² or less, it does not fall off the holding frame without being finely broken by heating. That is, the surface compressive stress is 600 kg / c.
If it exceeds m ² , it is finely broken and falls off from the holding frame to form a large opening. Even with a sheet glass having a surface compressive strength of less than 200 kg / cm ² , the purpose as a whole is achieved,
A surface compression strength of 200 kg / cm ² or more is less likely to break due to an outdoor fire. Further, the second glass sheet has a surface compressive stress of 1200 kg / cm ² or more and 1700 kg.
/ Cm ² , if the surface compression stress is less than 1200 kg / cm ² , the material may be broken by heating and fall off, and the surface compression stress is 1700 kg.
If it exceeds / cm ² , heating becomes strong, but a thick glass plate is required, and it becomes expensive and uneconomical. By applying a heat ray reflective film to the double-glazed glass, improvement in fire prevention performance can be expected.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 and 2, the double-glazed glass of the present invention is obtained by laminating two glass sheets 1 and 2 around the entire circumference thereof with a space therebetween in a thickness direction via a spacer 3. , 2 and the spacer 3 with the sealing layers 4, 5 interposed therebetween, and the two glass sheets 1,
A closed space A is formed between the two sheets, and among the two sheet glasses, the first sheet glass 1 on the outdoor side is made of double strength glass having a thickness of 3 mm to 5 mm, and the second sheet glass 2 on the indoor side is It is made of a sheet glass having a higher degree of heat strengthening than the double strength glass having a thickness of 3.2 mm to 5 mm. The double glazing is fitted and fixed in a sash frame 7 built on a structure.

The double strength glass is JIS R3222.
A glass sheet manufactured by the float method specified in JIS R3202, or a glass sheet specified by JIS R3202.
It is manufactured by heat-strengthening a heat-absorbing plate glass manufactured by a float method specified in SR3208 to a degree of surface compression stress of 200 kg / cm ² or more and 600 kg / cm ² or less. In addition, the second glass sheet 2 has a slightly higher degree of strengthening than the normal tempered glass (surface compressive stress of 900 kg / cm ² or more and less than 1200 kg / cm ² ), and has a surface compressive stress of 1200 kg / cm ² or more and 17 kg / cm ² or more.
00kg / cm less than ² (the so desire 1400 kg / cm ²
１1600 kg / cm ² : The edge finish is usually the same as the roving surface finish of the tempered glass. The sealing layers 4, 5 are provided with a first sealing material 4 interposed between the spacer 3 and the first and second glass sheets 1, 2 and a first sealing material 4 between the both glass sheets 1, 2. And a second sealing material 5 interposed outside the first sealing material. The first sealing material 4 is made of polyisobutylene, and the second sealing material 5 is made of polysulfide or silicone.

The spacer 3 is made of aluminum and is formed in an annular shape over the entire periphery of the heat-strengthened glass 1. The spacer 3 is formed on both lateral surfaces (in the first glass sheet 1 and the second glass sheet 2) in a sectional view. It has an O-shape with a constriction 8 formed on the opposing surface), has an opening 9 formed on the closed space A side, and is filled with a desiccant 10 therein.
Thus, the first seal member 4 is easily held in the constriction 8. Further, even when the spacer 3 is made of a nonmetallic material represented by resin, the same fire prevention performance is exhibited.

Another Embodiment The double-glazed glass is not limited to two glass sheets, but may be three or more glass sheets. The first glass sheet 1 is
In addition to the double-strength glass, a plate glass having a lower degree of thermal strengthening than the double-strength glass may be used. That is, in an extreme case, for example, ordinary float glass may be used. The glass may be more easily broken by heating than double-strength glass, but it is sufficient if it remains in the sash without being broken finely and has a heat shielding effect on the second glass sheet. By providing a heat ray reflective film (Low-E film) to the double-glazed glass, improvement in fire prevention performance can be expected. In this case, a film is formed on the air layer side of the outdoor glass (mainly, a sputtering film for heat shielding), but the most preferable in terms of fire prevention performance is CVD applied to the indoor glass.
It is a membrane. Formed by sputtering film, Ag film is mainly formed, since heat reflecting performance good poor in easily heat-resistant oxidized with heating, towards SnO ₂ film by CVD is 50
If it is resistant to heat of 0 to 600 [deg.] C. and is formed on the indoor glass, the temperature difference between the first and second glass sheets is unlikely to occur, heat resistance is high, and cracking is difficult. The application to laminated glass is also described for reference. The first sheet glass made of the double-strength glass and the second sheet glass made of the high-strength glass are integrated with a heat-resistant intermediate film made of, for example, a fluororesin film. Further, if the heat-resistant intermediate film is made of a resin film that is foamed by heating, the heat insulation performance in the event of a fire is still improved.

The spacer 3 is not necessarily made of aluminum, but may be made of iron. In such a case, the weight of the spacer 3 is increased, but the structure becomes more fire-resistant. Further, the shape is not limited to the above-described embodiment, and may be a quadrangular section. Further, the material of the first and second seal members 4 and 5 is not limited to the one of the above-described embodiment. For example, a flame-retardant silicone sealing material is used for the second seal member 5 to further improve the fire prevention performance. Deformations can be made. In the embodiment, the first and second seal members 4 and 5 are referred to as a seal layer.

[0015]

EXAMPLES The fire prevention test of the double glazing was carried out according to the Ministry of Construction Notification No. 1125 No. 2 Class B fire prevention test method.
In the second kind fire prevention test, the test specimen is placed in a heating atmosphere at 795 ° C. for 20 minutes. According to this, the double glazing of the present invention proved to be acceptable. Note that, in the claims, a reference numeral is written for convenience of comparison with the drawings, but the present invention is not limited to the configuration of the attached drawings by the entry.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a mounting structure of a double glazing of the present invention.

FIG. 2 is a longitudinal sectional view of a main part of the double glazing of the present invention.

[Explanation of symbols]

 1, 2 sheet glass 3 spacer 4, 5 seal layer A closed space

Claims (4)

[Claims] 1. A plurality of plate glasses are laminated with a spacer in the thickness direction over the entire circumference thereof with a spacer interposed therebetween, and a seal layer is interposed between the plate glass and the spacer to form the plurality of plate glasses. It is a double glazing having a closed space formed between the plurality of glass sheets,
The first sheet glass on the outdoor side is made of a double-strength glass or a sheet glass having a lower degree of thermal strengthening than the double-strength glass, and the second sheet glass on the indoor side is made of a sheet glass having a higher degree of thermal strengthening than the double-strength glass. Double-glazed glass. 2. The double-strength glass has a surface compressive stress of 20
^2. The double glazing according to claim 1, wherein the double glazing is made of a material having a degree of strengthening of 0 kg / cm ² or more and 600 kg / cm ² or less. 3. The second glass sheet has a surface compression stress of 12
00kg / cm ² or more and 1700 kg / cm ² less than set to enhance the degree consists Aru things claim 1 or 2 double glazing according. 4. The double glazing according to claim 1, wherein a heat ray reflective film is provided on at least one surface of the first glass sheet and the second glass sheet.