JP6872158B2 - Sound insulation board - Google Patents

Description

The present invention relates to a sound insulating plate made of laminated glass.

As a sound insulation plate arranged along the side edge of a vehicle passage (for example, a highway, a general road, a railroad track, etc.), a sound insulation plate having a transparent plate is being studied. The occupants of the vehicle can see the surrounding scenery through the transparent plate. As this transparent plate, various studies have been made on using a glass plate having less deterioration by ultraviolet rays than a resin plate.

For example, Patent Document 1 discloses laminated glass using chemically strengthened glass as a sound insulating plate. This laminated glass is an intermediate between a first chemically strengthened glass having a thickness of 1.5 to 4 mm arranged on the outside of the road and a chemically strengthened glass having a thickness of 1.5 mm or more arranged on the inside of the road. It is constructed by laminating through a film.

Japanese Unexamined Patent Publication No. 2013-023912

The sound insulation board installed in the aisle is required to have further soundproofing and safety. Regarding soundproofing, the thickness of the glass plate arranged on the side of the passage where noise is generated and the thickness of the glass plate arranged on the side opposite to the passage (hereinafter referred to as “surroundings”) are important. Further, regarding safety, even if the glass plate is broken, it is necessary to suppress damage caused by broken pieces (glass pieces) of the sound insulation plate on the side of the passage and the surrounding side.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a sound insulation plate capable of ensuring soundproofing and safety.

According to one aspect of the present invention, in the sound insulation plate, a first tempered glass arranged on the side of the passage and a second tempered glass arranged on the side opposite to the passage are laminated via an interlayer film. A sound insulating plate made of laminated glass, wherein the first tempered glass has a thickness of 4 mm or more and 8 mm or less, and the second tempered glass has a thickness of less than 4 mm. 1 of tempered glass and the second tempered glass consists of chemically reinforced glass, the depth of the compressive stress layer in the first reinforcement glass Ru der less 12 [mu] m.
According to another aspect of the present invention, the sound insulating plate has a first tempered glass arranged on the side of the passage and a second tempered glass arranged on the side opposite to the passage through an interlayer film. The first tempered glass has a thickness of 4 mm or more and 8 mm or less, and the second tempered glass has a thickness of less than 4 mm. The first tempered glass and the second tempered glass are composed of chemically tempered glass, and the depth of the compressive stress layer in the second tempered glass is 12 μm or less.
According to another aspect of the present invention, the sound insulating plate has a first tempered glass arranged on the side of the passage and a second tempered glass arranged on the side opposite to the passage through an interlayer film. The first tempered glass has a thickness of 4 mm or more and 8 mm or less, and the first tempered glass and the second tempered glass are chemically strengthened. It is composed of glass, and the second tempered glass has a thickness of less than 1.5 mm.

According to the sound insulation plate of the present invention, soundproofing and safety can be ensured.

It is sectional drawing which shows the sound insulation panel including the sound insulation plate by one Embodiment of this invention. It is a schematic block diagram of the metal sphere used in the test.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. The present invention will be described in the following preferred embodiments. Changes can be made by many methods without departing from the scope of the present invention, and other embodiments other than the present embodiment can be used. Therefore, all modifications within the scope of the present invention are included in the claims.

Here, in the figure, the parts indicated by the same symbols are similar elements having the same functions. Further, in the present specification, when the numerical range is expressed by using "~", the numerical values of the upper limit and the lower limit indicated by "~" are also included in the numerical range.

FIG. 1 is a cross-sectional view showing a sound insulation panel including the sound insulation plate of the present embodiment. The sound insulation panel 10 is arranged along the side edge of the vehicle passage (for example, a road, a railroad track, etc.). For example, the sound insulation panel 10 is installed in a grade separation or an elevated passage.

The sound insulation panel 10 has a sound insulation plate 20 and a support frame 40 that supports the outer peripheral portion of the sound insulation plate 20. The sound insulation plate 20 is transparent, and the occupants of the vehicle can visually recognize the surrounding scenery through the sound insulation plate 20. The support frame 40 may be transparent or opaque.

By supporting the outer peripheral portion of the sound insulation plate 20, the support frame 40 can suppress the deformation of the sound insulation plate 20. The support frame 40 has a groove 41 that accommodates the outer peripheral portion of the sound insulation plate 20. The groove width of the groove 41 may be larger than the plate thickness of the sound insulating plate 20, and the support frame 40 may support the sound insulating plate 20 via the cushioning material 44. The support frame 40 is preferably made of a metal (including an alloy) such as aluminum or iron, or a resin. Further, it is preferable to use rubber or foamed resin as the cushioning material 44.

The sound insulation plate 20 of the present embodiment is a laminated glass in which a first tempered glass 21 arranged on the passage side and a second tempered glass 22 arranged on the peripheral side are laminated via an interlayer film 23. Consists of. The first tempered glass 21 constituting the sound insulating plate 20 has a thickness of 4 mm or more and 8 mm or less, and the second tempered glass 22 has a thickness of less than 4 mm.

The first tempered glass 21 of the sound insulating plate 20 is exposed to the passage, and the second tempered glass 22 is exposed to the surrounding side.

By making the first tempered glass 21 having a thickness of 8 mm or less and the second tempered glass 22 having a thickness of less than 4 mm, it is possible to reduce the maximum weight of the glass piece to 1 g or less when the sound insulation plate 20 is damaged. .. By setting the maximum weight of the glass piece to 1 g or less, safety can be ensured.

In order to reduce the damage caused by the glass piece at the time of breakage, it is preferable that the maximum weight of the glass piece is small. The maximum weight of a piece of glass is approximately proportional to the thickness of tempered glass. In particular, by reducing the size of the glass pieces scattered to the surrounding side, damage to the surroundings can be suppressed. Therefore, by setting the thickness of the second tempered glass 22 to less than 4 mm, the maximum weight of the glass piece can be reduced.

By making the thickness of the first tempered glass 21 made of a veneer 4 mm or more, the required sound insulation can be ensured. In the present embodiment, the thickness of the first tempered glass 21 made of a veneer is 4 mm or more, and the thickness of the second tempered glass 22 made of a veneer is less than 4 mm. The glass 21 and the second tempered glass 22 are configured to have different thicknesses. By making the first tempered glass 21 and the second tempered glass 22 have different thicknesses, it is possible to effectively suppress the occurrence of the coincidence effect. The coincidence effect means a phenomenon in which a decrease in transmission loss occurs at a specific frequency.

Considering sound insulation and safety, the first tempered glass 21 is preferably 4 mm or more and 8 mm or less, and the second tempered glass 22 is preferably 3.5 mm or less, more preferably 3 mm or less. , 1.5 mm or less is more preferable, and 1.3 mm or less is most preferable. However, the second tempered glass 22 is preferably 0.5 mm or more so that it can be easily handled at the time of manufacture.

The tempered glass applied to the first tempered glass 21 and the second tempered glass 22 refers to a glass having a compressive stress layer on the glass surface and a tensile stress layer inside the glass. 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. For example, the value of surface compressive stress (CS) is preferably 350 MPa or more, more preferably 450 MPa or more.

The chemically strengthened glass in the present embodiment preferably has a compressive stress layer depth (DOL: Depth of Layer) of 10 μm or more. By setting the depth of the compressive stress layer to 10 μm or more, it is possible to improve the flame resistance.

However, although it is preferable to increase the depth of the compressive stress layer, it takes time to increase the depth of the compressive stress layer. Therefore, from the viewpoint of productivity, it is preferably 15 μm or less, and further preferably 12 μm or less.

The depth of the compressive stress layer can be measured with a surface stress meter FSM-6000 (manufactured by Orihara Seisakusho).

In the ion exchange method, the front surface and the back surface of the glass plate are ion-exchanged, and ions having a small ionic radius (for example, lithium ion and sodium ion) contained in the glass are replaced with ions having a large ionic radius (for example, potassium ion). As a result, surface compressive stress can be generated in the front surface layer and the back surface layer of the glass plate. In the ion exchange method, a glass plate is immersed in a high-temperature treatment liquid to perform ion exchange.

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 wind-cooled strengthening method, which is a physical strengthening method, takes several seconds to several tens of seconds for the strengthening process, and is therefore much more productive than the chemical strengthening method such as the ion exchange method. For example, the value of the surface compressive stress of the air-cooled tempered glass is preferably 200 MPa or more, more preferably 220 MPa or more.

Tempered glass has higher strength than non-tempered glass and is not easily broken. In addition, the glass piece at the time of breakage can be made smaller. However, if the thickness of the first tempered glass 21 exceeds 8 mm, the maximum weight of the glass piece may exceed 1 g, and it is important that the thickness of the tempered glass is 8 mm or less.

Regarding the sound insulation plate 20 of the present embodiment, it is preferable that the first tempered glass 21 is made of chemically tempered glass. Since the first tempered glass 21 is exposed to the passage, there is a concern that an impact may be applied to the first tempered glass 21 by an attacking object such as a stepping stone from the passage. Therefore, the first tempered glass 21 is required to have impact resistance against flying stones and the like. By changing the first tempered glass 21 to chemically tempered glass, the impact resistance against an attacking object can be improved. Even when the first tempered glass 21 is hit by an attacking object, if the first tempered glass 21 is chemically tempered glass, it is possible to prevent the Hertz cone cracks generated on the attacking surface from reaching the interlayer film 23. be able to. A Hertz cone crack is a fracture that occurs from a conical fracture surface called a Hertz cone that occurs on the attack surface.

The second tempered glass 22 is preferably made of chemically tempered glass. By using the second tempered glass 22 as chemically tempered glass, the impact resistance against an attacking object can be improved.

When the second tempered glass 22 is air-cooled tempered glass, the second tempered glass 22 may be made of heat-resistant tempered glass. By using the second tempered glass 22 as heat-resistant tempered glass, the flame resistance of the sound insulating plate 20 can be improved. Here, the heat-resistant tempered glass is a glass with increased heat-resistant strength. For example, in Japan, the flame-shielding performance stipulated in Article 2-9-2 of the Building Standards Act and Article 64 of the Building Standards Act is exhibited. It is a satisfying tempered glass. As a test for evaluating this, for example, a fire prevention test based on a heating temperature curve of ISO8341: 1999 is known.

In the tempered glass of the present embodiment, SiO ₂ is 56 to 75%, Al ₂ O ₃ is 0 to 20%, Na ₂ O is 8 to 22%, and K ₂ O is 0 to 10 in terms of oxide-based molar percentage. %, MgO is preferably 0 to 14%, ZrO ₂ is 0 to 5%, and CaO is preferably 0 to 12%. Hereinafter, each component will be described, and% means mol%.

SiO ₂ 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.

Al ₂ O ₃ is not essential, but 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 the surface compressive stress (CS). It 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. ..

It is preferred that the total _SiO 2 + _Al 2 _{O 3} content of SiO ₂ and _Al 2 _{O 3} is 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 that forms compressive stress by ion exchange, and has the effect of increasing the depth (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 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.

K ₂ O is not essential, but may be included 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 K ₂ O content 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 MgO content 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 difficulty of 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 the 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 SrO especially when it is desired to increase the DOL. When contained, the amount of SrO 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 effect of increasing the specific gravity of glass, it is preferable not to include it when the intention is to reduce the weight. When contained, the amount of BaO 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 exemplarily.

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%.

In the present embodiment, the first tempered glass 21 and the second tempered glass 22 are adhered to each other via the interlayer film 23. The interlayer film 23 is composed of, for example, a thermoplastic resin, a thermosetting resin, an ultraviolet curable resin, and the like.

Among these resin materials, the interlayer film 23 is a resin material having ^{a compressive shear strength of 25 N / mm 2} or more measured in accordance with JIS K 6852 (1994) (compressive shear adhesive strength test method for adhesives). is preferably used in, more preferably 28N / mm ² or more, more preferably 30 N / mm ² or more. Even if either the first tempered glass 21 or the second tempered glass 22 is damaged by an impact or the like, the glass pieces can be adhered to the interlayer film 23 to prevent the glass pieces from scattering. It will be possible.

Although compressive shear strength of the intermediate layer 23 is preferably large, it is preferably 37N / mm ² or less in order to improve impact resistance, and more preferably 35N / mm ² or less.

Further, as preferable resin materials, ethylene-vinyl acetate copolymer (EVA: Ethylene-Vinyl Aacetate), polyvinyl butyral (PVB: Poly Vinyl Butyral), polyurethane, polyvinyl chloride, ionomer resin, cellulose diacetate, cellulose triacetate and the like are used. Can be mentioned. Among these resin materials, it is preferable to use an ionomer resin having a high compressive shear strength for the interlayer film 23.

The thicker the interlayer film 23 is, the better the impact resistance of the laminated glass is, but the scenery seen through the sound insulating plate 20 is easily distorted. The thickness of the interlayer film 23 is preferably 0.7 mm or more. If it is 0.7 mm or more, the impact resistance of the sound insulation plate 20 is improved. The thickness of the interlayer film 23 is more preferably 0.8 mm or more. The thickness of the interlayer film 23 is preferably 3.0 mm or less. If it is 3.0 mm or less, the scenery seen through the sound insulation plate 20 can be seen without distortion. In addition, the cost of the sound insulation plate 20 is reduced. The thickness of the interlayer film 23 is more preferably 2.0 mm or less, further preferably 1.3 mm or less, particularly preferably 1.0 mm or less, and most preferably 0.9 mm or less. preferable.

The sound insulation plate 20 in this embodiment is manufactured as follows, for example.

When the sound insulating plate 20 in the present embodiment is manufactured, it goes through a glass plate manufacturing process, a strengthening treatment process, and a laminated glass manufacturing process.

In the glass plate manufacturing process, for example, various raw materials are mixed in appropriate amounts, heated to about 1300 to 1800 ° C., melted, homogenized by defoaming, stirring, etc., and then homogenized by a well-known float method, down draw method, rollout method, press. A glass plate is manufactured by molding it into a plate shape by a method or the like, slowly cooling it, and then cutting it into a desired size.

In the strengthening treatment step, a compressive stress layer having a desired surface compressive stress is formed on the obtained glass plate. The strengthening treatment step in the case of manufacturing a chemically strengthened glass plate goes through a preheating step, a chemically strengthening step, and a slow cooling step.

In the preheating step, the glass plate is preheated before the chemical strengthening treatment is performed. Preheating is performed by, for example, placing a glass plate in an electric furnace at room temperature, raising the temperature of the electric furnace to the preheating temperature, and holding the electric furnace for a certain period of time. In order to prevent cracking due to thermal shock in the chemical strengthening process, it is preferable to hold the glass plate at the preheating temperature for a certain period of time after the temperature rise is completed. This holding time is preferably 10 minutes or more, more preferably 20 minutes or more.

In the chemical strengthening step, the preheated glass plate is immersed in, for example, a heated potassium nitrate molten salt, and Na on the glass surface layer and K in the molten salt are ion-exchanged. Any method may be used as long as Na and K can be ion-exchanged. Incidentally, potassium nitrate molten salt, or potassium nitrate salts in the present invention, other KNO _3, including those containing KNO ₃ and 10 wt% or less of NaNO _3.

The chemical strengthening treatment conditions for forming a compressive stress layer having a desired surface compressive stress on the glass plate vary depending on the thickness of the glass plate and the like, but the glass is immersed in a molten potassium nitrate salt at 350 to 550 ° C. for 2 to 50 hours. It is typical to immerse the board.

In the slow cooling step, the glass plate taken out from the molten salt is slowly cooled. It is preferable that the glass plate taken out from the molten salt is held at a uniform temperature for a certain period of time in order to prevent a temperature distribution from occurring on the main surface of the glass plate, instead of immediately slowly cooling the glass plate. The holding temperature preferably has a difference of 100 ° C. or less from the temperature of the molten salt, and more preferably 50 ° C. or less. The holding time is preferably 10 minutes or more, more preferably 20 minutes or more.

The glass plate taken out from the molten salt is preferably slowly cooled so that the slow cooling rate until the glass plate reaches 100 ° C. is 300 ° C./hour or less.

Further, the strengthening treatment step in the case of manufacturing the air-cooled tempered glass plate goes through a heating step and a cooling step.

In the heating step, the glass plate obtained in the glass plate manufacturing step is heated. The heated glass temperature is preferably 640 to 690 ° C, more preferably 650 to 680 ° C.

By setting the glass temperature to 690 ° C. or lower, it is possible to prevent the glass from viscous flow deformation and prevent the final quality of the glass from deteriorating. Further, by setting the glass temperature to 640 ° C. or higher, it is possible to prevent the glass from breaking at the initial stage of cooling and to sufficiently apply residual stress.

In the cooling step, the glass plate after the heat treatment is rapidly cooled. The quenching of the glass plate is not particularly limited as long as it can be rapidly cooled, but for example, it is performed by air cooling treatment. As the air cooling treatment, for example, air-cooled tempered glass is obtained by blowing cooling air having a wind pressure of 30 kPa or less on both sides of the heat-treated glass to quench the glass.

The wind pressure is preferably 27 kPa or less, more preferably 25 kPa or less. If the wind pressure is in the above range, a wider range of air cooling strengthening device can be used. The wind pressure is preferably 10 kPa or more, more preferably 15 kPa or more, still more preferably 20 kPa or more, from the viewpoint of effectively applying residual stress.

As the air cooling strengthening device, a conventionally used wind example strengthening device can be used. For example, glass plates are arranged so as to be sandwiched between the upper and lower air cooling strengthening outlet members at a predetermined interval. , An air cooling strengthening device that rapidly cools with cooling air can be mentioned.

In the laminated glass manufacturing process, the first tempered glass 21 and the second tempered glass 22 are superposed via the interlayer film 23 and placed in a vacuum bag such as a rubber bag, and the pressure is about 1 to 100 kPa (. Pre-crimping is performed by heating to about 70 to 120 ° C. (more preferably 70 to 110 ° C.) while degassing so as to be more preferably 1 to 36 kPa), and further, in an autoclave, for example, a temperature of 120 to 160 ° C. and a pressure. The sound insulation plate 20 can be obtained by heating and pressurizing about 0.3 to 1.5 MPa.

[Test Example 1]
The first chemically strengthened glass having a thickness of 5.0 mm, the second chemically strengthened glass having a thickness of 1.3 mm, and the first chemically strengthened glass and the second chemically strengthened glass are bonded to each other 0. A laminated glass composed of an interlayer film made of an ionomer resin (SG: SentryGlas Dupont, registered trademark) having a thickness of .89 mm and a laminated glass made of it was prepared as a sound insulating plate. The compressive shear strength of the ionomer resin is 27 to 35 N / mm ² .

For safety, an impact resistance test was conducted on the sound insulation plate. The configuration of the sound insulation plate and the evaluation results are shown in the corresponding columns of Table 1.

<Impact resistance test>
Arrange so that the lower end of the sound insulation plate is located at a position about 1 m from the road surface height, suspend the attacking body shown in Fig. 2 at two points in the center of the sound insulation plate, and apply the potential energy required from the attacking position in the vertical direction. The first tempered glass of the sound insulation plate was attacked from the height of the sound insulation plate (95 cm) in a pendulum manner, and the total weight and the maximum weight of the glass pieces of the sound insulation plate were measured. FIG. 2 is a schematic view of the attacking body. As shown in FIG. 2, the attacking body has a 300 kg iron ball 100, a 50 mm protrusion 102 having a head 104 having a diameter of 24 mm, and a hanger 106. The head 104 applied an impact to the first tempered glass of the sound insulation plate.

The case where the shatterproof rate of the glass piece of the sound insulation plate was 99.0% or more and the maximum weight of the glass piece was 1.0 g or less was evaluated as ◯, and the case where this condition was not satisfied was evaluated as x.

[Test Examples 2 to 6]
The configuration of the sound insulation plate was changed to the configuration shown in Table 1, and the impact resistance test was performed in the same manner as in Test Example 1. The configuration of the sound insulation plate and the evaluation results are shown in the corresponding columns of Table 1.

In Test Example 1-6, the CS of the chemically strengthened glass was 380 MPa and the DOL was 12 μm regardless of the thickness.

Further, in Test Example 1-6, the compositions of the chemically strengthened glass and the air-cooled tempered glass were such that SiO ₂ : 71.2, Al ₂ O ₃ : 1.8, CaO: 8.4, MgO: 4.6. , Na ₂ O: 13.3 and K ₂ O: 0.7 (unit: mass%).

[Summary]
Regarding Test Examples 1 to 4 in Table 1, the thickness of the first chemically strengthened glass was 4 mm or more and 8 mm or less, and the thickness of the second chemically strengthened glass was less than 4 mm, so that the impact test was satisfied. In Test Example 5, the thickness of the second chemically strengthened glass was 8.0 mm, and in Test Example 6, the thickness of the first chemically strengthened glass was 10.0 mm, so that the impact test was not satisfied. It was.

10 ... sound insulation panel, 20 ... sound insulation plate, 21 ... first tempered glass, 22 ... second tempered glass, 23 ... interlayer film, 40 ... support frame, 41 ... groove, 44 ... cushioning material, 100 ... iron ball, 102 ... protrusion, 104 ... head, 106 ... hanger

Claims (8)

The first tempered glass arranged on the side of the passage and the second tempered glass arranged on the side opposite to the passage are sound insulation plates composed of laminated glass laminated via an interlayer film. ,
The first tempered glass has a thickness of 4 mm or more and 8 mm or less, and the second tempered glass has a thickness of less than 4 mm.
The first tempered glass and the second tempered glass are composed of chemically tempered glass.
The first sound insulation plate depth of the compression stress layer is Ru der less 12μm in tempered glass. The first tempered glass arranged on the side of the passage and the second tempered glass arranged on the side opposite to the passage are sound insulation plates composed of laminated glass laminated via an interlayer film. ,
The first tempered glass has a thickness of 4 mm or more and 8 mm or less, and the second tempered glass has a thickness of less than 4 mm.
The first tempered glass and the second tempered glass are composed of chemically tempered glass.
It said second sound insulation plate depth of the compression stress layer is Ru der less 12μm in tempered glass. The first tempered glass arranged on the side of the passage and the second tempered glass arranged on the side opposite to the passage are sound insulation plates composed of laminated glass laminated via an interlayer film. ,
The first tempered glass has a thickness of 4 mm or more and 8 mm or less.
The first tempered glass and the second tempered glass are composed of chemically tempered glass.
Sound insulation plate and the second tempered glass that have a thickness of less than 1.5 mm. The sound insulation plate according to any one of claims 1 to 3, wherein the depth of the compressive stress layer in the first tempered glass is 10 μm or more. The sound insulating plate according to any one of claims 1 to 4, wherein the depth of the compressive stress layer in the second tempered glass is 10 μm or more. The sound insulation plate according to any one of claims 1 to 5 , wherein the thickness of the interlayer film is 1.3 mm or less. The sound insulation plate according to any one of claims 1 to 6 , wherein the interlayer film has a compressive shear strength of ^{25 N / mm 2 or more.} The sound insulation plate according to any one of claims 1 to 7 , wherein the interlayer film is made of an ionomer resin.

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