JP4735627B2 - Glass plate joining structure and joining method thereof - Google Patents

Description

  In the present invention, a glass plate and a joining member or glass are stacked by a force generated by tightening a pair of fastening members that are overlapped with a glass plate that has a through-hole, or are laminated with glass plates that have a through-hole. It is the joining structure of the glass plate which joins plates, and its joining method.

  The glass plate joining structure and the joining method of the present invention are widely used in buildings, furniture, glass articles and the like using glass plates.

  Adhesive sheet is sandwiched between a glass plate and a joining member such as a metal plate joined to the glass plate in order to join the glass plate and another structural member, and joined to the glass plate. A method of fixing the glass plate and the bonding member by fixing the glass plate and the bonding member by passing through the screw members for bonding as a pair of tightening members into the through holes provided in the glass plate and the bonding member, and bonding the members to obtain the bonding strength. Are disclosed in Patent Documents 1 to 3.

  For example, in Patent Document 1, a sheet made of a fiber material impregnated with an uncured adhesive is sandwiched between a glass plate and a joining member, and inserted into a through hole formed in the glass plate and the joining member. A method for joining glass panels that are fastened and fixed with a screw member is disclosed. In order to suppress the occurrence of relative displacement between the glass panel and the plate material after bonding, a sheet made of a fiber material impregnated with an uncured adhesive is sandwiched between the glass plate and the bonding member, and then tightened and bonded. When the adhesive is cured, the sheet solidifies into a shape along the surfaces of both the glass panel and the plate material, and the glass panel and the plate material can be bonded and bonded via a strong adhesive layer cured integrally with the sheet. It is disclosed.

  Further, in Patent Document 2, in order to increase the durability of the joint portion compared to Patent Document 1, the adhesive impregnated into the sheet made of the fiber material impregnated with the adhesive is tightened in an uncured state, and the adhesive There has been disclosed a method for joining brittle members which are joined by being tightened again to a predetermined axial force after curing.

Further, in Patent Literature 3, when the glass plate and the joining member are fastened with a fastening tool such as a male screw member and a female screw member in the joining method by bonding, each fastening is performed by interposing a filler in the through hole. When a stress is applied between the glass plate and the joining member by tightening without any gap between the outer peripheral surface of the fixture and the inner peripheral surface of the glass plate side through hole, a plurality of glass plate side penetrations A glass plate joining method is disclosed in which stress acting on the holes is made uniform, stress is prevented from concentrating on a specific glass plate side through hole, and damage to the glass plate is suppressed.

  The glass plate joining method described in Patent Literatures 1 to 3 is a method of obtaining a joining strength by bonding a glass plate and a joining portion. In view of the occurrence of cracks in the glass plate, the fastening with the screw member for joining is moderate, and the joining strength depends on the adhesion between the glass plate and the joining member. Thus, in the joining method which adhere | attaches the glass plate and joining member of patent documents 1-3, although the junction part of a glass plate is fastened with the screw member, joining strength is as a glass plate and a joining member. It relied on bonding with an adhesive sheet sandwiched between plates. Since it adhere | attaches with an adhesive material sheet | seat, the disassembly after joining is difficult.

  Moreover, in patent document 4 by this applicant, it is sufficient to employ | adopt as rib glass, for example, when producing the rib glass of a rib glass screen by joining firmly by tightening the tempered glass which pierced with the high strength volt | bolt. A method of joining strong tempered glass sheets is disclosed. Specifically, the joint is sandwiched between a tempered glass plate through a friction member between the tempered glass plate from both sides, and is tightened with bolts and nuts that are pierced through the tempered glass plate and the joint plate for high strength bolt insertion. The joining method of the tempered glass board which joins tempered glass boards with a frictional force which arises through a joined board, or joins tempered glass and a joined board is indicated.

In the method for joining tempered glass sheets described in Patent Document 4, high-strength bolt friction used to strongly join metal members in the construction of bridges and towers in order to construct large buildings such as rib glass screens. A large glass building such as a rib glass screen is formed by strongly tightening a large thick tempered glass plate using high strength bolts and nuts.
JP 2000-87924 A JP 2002-155909 A JP 2003-327453 A JP 2006-250345 A

  In a conventional glass plate joining method, if a glass plate is over-tightened with a pair of fastening members inserted into the through-holes of the glass plate, such as bolts / nuts or screws / nuts, the glass plate is damaged from the end of the through-hole. There was a problem that it was easy to do.

  In the conventional glass plate joining method, when a glass plate is tightened with a pair of tightening members such as bolts / nuts or screws / nuts, the glass plate or When the temperature of the fastening member is changed, the bolt / nut or the screw / nut is thermally expanded or contracted, and the force in the bolt axis direction or the screw axis direction due to the fastening is changed.

  In the present invention, when a through hole is made in a glass plate and tightened with a bolt / nut or a screw / nut, the above-mentioned cracking problem does not occur, and the bolt / nut or screw / nut as a pair of tightening members A glass plate that has little change in the force in the bolt axis direction or screw axis direction due to tightening of bolts and nuts due to temperature change after tightening the glass plate with etc., and has stable joint strength against temperature change after tightening It is an object to provide a bonding structure and a bonding method.

  According to the glass plate joining structure and the joining method of the present invention, at the end of the through hole of the glass plate, a force caused by fastening a pair of fastening members, for example, an axial force caused by fastening a bolt / nut and a screw / nut. Without applying the edge, avoid the end of the through-hole, apply the axial force by tightening the bolt / nut and screw / nut to the glass plate, and firmly join the glass plate and the joining member, or the glass plates together Therefore, the bonding between the glass plate and the bonding member having high durability without causing the bonding portion to shift or the bonding between the glass plates is provided.

  In the glass plate joining structure and the joining method of the present invention, a force generated by fastening a pair of fastening members such as bolts / nuts or screws / nuts is passed through a plain washer sandwiched between the glass plate and the joining member. When transmitting, the inner diameter of the plain washer is larger than the diameter of the through hole in the glass plate and is arranged concentrically to avoid the end of the through hole in the glass plate where it is prone to cracking and its surroundings. It is now possible to transmit force in a small area directly to the glass plate via a plain washer that is pressed against the glass plate.

  Specifically, in order to prevent cracks when bolts / nuts or screws / nuts are tightened, the inner diameter of the plain washer is 1.0 mm or more, preferably 4.0 mm or more larger than the diameter of the through hole formed in the plate glass. To do. In other words, the distance from the end of the through hole of the plate glass to the flat washer is 0.5 mm or more, preferably 2.0 mm or more. If the inner diameter of the plain washer is less than 1.0 mm with respect to the diameter of the plate glass through-hole and the distance from the end of the plate glass through-hole to the plain washer is less than 0.5 mm, cracks will occur at the end of the plate glass through-hole and the periphery. May occur. In practice, it is not necessary to increase the inner diameter of the plain washer beyond 30.0 mm with respect to the diameter of the through hole of the plate glass. The difference between the inner diameter of the plain washer and the diameter of the through hole of the glass plate is 1.0 mm or more and 30.0 mm or less, preferably 4.0 mm or more and 20.0 mm or less.

  At this time, if the glass plate is tempered glass, it can be strongly tightened with bolts and nuts, etc. However, when using hard steel (stainless steel), stainless steel, etc. for the flat washer, the finish of the flat washer is particularly good. If the accuracy is poor and there is deformation, if the green glass that has not been tempered after manufacturing is tightened with bolts, nuts, etc., a local force is applied at the interface between the green glass and the plain washer, and the glass tends to break. However, if a flat washer made of aluminum or aluminum alloy with a Young's modulus close to that of glass is used, the flat washer will be appropriately deformed. Is prevented from being damaged due to an applied force. The fact that the flat washer deforms moderately, in other words, that it moderately adapts and has a buffering effect applies even if the glass plate is tempered glass, and a local force is generated when the flat washer is pressed against the glass plate. hard.

Usually, the Young's modulus of soda lime silicate glass used for general purposes such as construction is 7.16 × 10 ⁴ MPa. Therefore, in order to obtain the above-described buffer action, it is preferable that the Young's modulus of the plain washer is 6.70 × 10 ⁴ MPa or more and 7.30 × 10 ⁴ MPa or less. If the Young's modulus of the plain washer is smaller than 6.70 × 10 ⁴ MPa, strong bonding strength cannot be obtained at the plate glass bonding portion. Preferably, it is 6.80 × 10 ⁴ MPa or more. If the Young's modulus of the flat washer is greater than 7.30 × 10 ⁴ MPa, a local force is applied at the interface between the plate glass and the flat washer, and if the plate glass is a green plate glass, there is a possibility of breakage. The pressure is preferably 7.20 × 10 ⁴ MPa or less.

Examples of the metal material having a Young's modulus of 6.80 × 10 ⁴ MPa or more and 7.20 × 10 ⁴ MPa or less include aluminum and aluminum alloys, which are close to the Young's modulus of soda lime silicate glass.

  Table 1 shows the physical properties of plate glass and aluminum. (Based on the Central Glass General Catalog / Plate Glass / Related Products, page 191; Science Chronology 2007 Desk Edition 33 (379))

Aluminum has a Young's modulus of 6.86 × 10 ⁴ MPa, and is a preferable material for a plain washer used in the glass bonding structure and the bonding method of the present invention. The Young's modulus of stainless steel is 19.5 × 10 ⁴ MPa, and the Young's modulus of mild steel is 20.6 × 10 ⁴ MPa. The Young's modulus of copper is 10.30 × 10 ⁴ MPa, which is relatively close to glass, but aluminum is closer to glass and Young's modulus, and aluminum is used for the bonding structure and bonding structure of the glass of the present invention. This is a particularly preferable material for the plain washer.

  In addition to Young's modulus, glass and aluminum have values close to Poisson's ratio and specific gravity. The Young's modulus (longitudinal elastic modulus) is a constant that determines the value of strain with respect to stress in the elastic range. From the Hooke's law [strain ε] = [stress σ] / [Young's modulus E], E = σ / ε It is represented by The Poisson's ratio is the ratio of elongation in the load direction and contraction in the direction perpendicular to the load when tension is applied within the elastic limit.

  On the other hand, in the glass plate joining structure and the joining method of the present invention, the linear expansion coefficient with respect to the temperature change of the flat washer is also important.

  Table 2 shows the linear expansion coefficients of various metals used as the material of the metal plate having through holes that are bolts, nuts, washers, and joining members.

The linear expansion coefficient of glass is 8.5 × 10 ^{−6 to} 9.0 × 10 ⁻⁶ / ° C. at room temperature to 350 ° C.

As shown in Table 2, the linear expansion coefficient of various metals used as a material of a metal plate having a pair of tightening members such as bolts / nuts or screws / nuts and plain washers, or through-holes as joining members, Steel (SS400) is 12 × 10 ⁻⁶ / ° C. at 0 to 100 ° C., stainless steel SUS304 is 17 × 10 ⁻⁶ / ° C., and SUS410 is 10.4 × 10 ⁻⁶ / ° C. The carbon steel (S45C) is 11 × 10 ⁻⁶ / ° C.

  When a material with a higher linear expansion coefficient than a glass plate is used for a pair of bolts, such as bolts and nuts, when the temperature rises after tightening, the bolt expands more than the glass plate, so that the bolt and nut The spacing between them increases and the axial force of the bolt decreases. On the other hand, when the temperature is lowered after tightening, the bolt is contracted more than the glass plate, so that the space between the bolt and the nut is narrowed, and the force in the bolt axial direction is increased. That is, the axial force of the bolt changes due to the temperature change after tightening, and there is concern about the stability of the force in the bolt axial direction.

As shown in Table 2, the linear thermal expansion coefficient of aluminum or aluminum alloy is 18 × 10 ⁻⁶ / ° C. or higher and 26 × 10 ⁻⁶ / ° C. or lower at −50 ° C. to 200 ° C. The linear thermal expansion coefficient of aluminum or an aluminum alloy is SS400, SUS304 shown in Table 2, which forms glass and a metal plate having a washer and a through hole as a joining member, such as bolts and nuts as a pair of fastening members. It is larger than a metal containing iron as a main component or a main component such as SUS410 or S45C. Therefore, by inserting a flat washer made of aluminum or aluminum alloy between the bolt and nut, the change in force in the bolt axial direction due to tightening of the bolt and nut etc. against the temperature change after tightening with the bolt and nut etc. Less. Thus, inserting a flat washer made of aluminum or aluminum alloy between bolts and nuts has an effect of exhibiting a stable joining force against temperature changes after tightening.

That is, the present invention is a glass plate joining structure in which a glass plate and a joining member are overlapped by a force generated by tightening a pair of fastening members inserted through the through holes, and a glass plate holding a through hole. The Young's modulus is 6.70 × 10 ⁴ MPa or more and 7.30 × 10 ⁴ MPa or less, the linear expansion coefficient is larger than the linear expansion coefficient of the glass plate and the pair of fastening members, and the inner diameter of the through hole of the glass plate is A glass plate joining structure characterized in that a flat washer larger than the diameter by 1.0 mm or more is sandwiched between a glass plate and a joining member.

Furthermore, the present invention is a glass plate joining structure in which glass plates are joined by a force generated by fastening a pair of fastening members inserted through the through holes, and the glass plates having the through holes are laminated. 6.70 × 10 ⁴ MPa or more and 7.30 × 10 ⁴ MPa or less, the linear expansion coefficient is larger than the linear expansion coefficient of the glass plate and the pair of fastening members, and the inner diameter is larger than the diameter of the through hole of the glass plate. A glass plate joining structure characterized in that a flat washer larger by 1.0 mm or more is pressed against and / or sandwiched between glass plates.

Specifically, the linear expansion coefficient of the plain washer is 17 × 10 ⁻⁶ / ° C. of SUS304, which is stainless steel having a large linear expansion coefficient among the materials of bolts and nuts that are a pair of fastening members. It is 18 × 10 ⁻⁶ / ° C. or more (−50 ° C. to 200 ° C.) which is the lower limit of the linear thermal expansion coefficient of aluminum or aluminum alloy, and is 26 × 10 ⁻ which is the upper limit of the linear thermal expansion coefficient of aluminum or aluminum alloy. It is preferably ⁶ / ° C. or less (−50 ° C. to 200 ° C.). When the linear expansion coefficient is larger than 26 × 10 ⁻⁶ / ° C., the dimensional change of the flat washer with respect to the temperature rise or fall is too large, and it is unsuitable as a member of a joint structure.

  Furthermore, the present invention is the above glass bonding structure, wherein the plain washer is made of aluminum or aluminum alloy.

  Furthermore, the present invention is the above glass plate joining structure, wherein the flat washer is arranged concentrically with respect to the through hole of the glass plate.

Further, the present invention is a glass plate joining method in which a glass plate having a through hole and a joining member are overlapped, and the glass plate and the joining member are joined by a force generated by fastening of a pair of fastening members inserted through the through holes. The Young's modulus is 6.70 × 10 ⁴ MPa or more and 7.30 × 10 ⁴ MPa or less, the linear expansion coefficient is larger than the linear expansion coefficient of the glass plate and the pair of fastening members, and the inner diameter of the through hole of the glass plate is A glass plate joining method characterized by sandwiching a plain washer larger by 1.0 mm or more than a diameter between a glass plate and a joining member.

Furthermore, the present invention is a glass plate joining method in which glass plates having through-holes are overlapped and the glass plates are joined together by a force generated by fastening a pair of fastening members inserted through the through-holes, and the Young's modulus is 6.70 × 10 ⁴ MPa or more and 7.30 × 10 ⁴ MPa or less, the linear expansion coefficient is larger than the linear expansion coefficient of the glass plate and the pair of fastening members, and the inner diameter is 1 than the diameter of the through hole of the glass plate. A method for joining glass plates, characterized in that a flat washer larger than 0.0 mm is pressed against and / or sandwiched between glass plates.

  When a pair of fastening members, for example, a glass plate having a through hole and a joining member or glass plates are joined together by a force by tightening a screw / nut or a bolt / nut, the glass plate joining structure of the present invention and its joining In the method, a plain washer is sandwiched between a glass plate and a metal plate or between glass plates, and the plain washer is directly pressed against the glass plate. At that time, by arranging the plain washer so that the inner diameter of the plain washer is larger than the diameter of the through hole of the glass plate and concentrically, the force is transmitted by avoiding the end of the through hole of the glass plate and its surrounding area where cracks are likely to occur. It is done.

  Furthermore, by using a plain washer made of aluminum or aluminum alloy, whose Young's modulus is close to that of soda lime silicate glass, the plain washer is appropriately deformed, in other words, it is moderately familiar and has a buffering effect, It was prevented that the soda lime silicate glass and the flat washer were damaged by applying a local force at the interface.

  Furthermore, it is preferable to use a flat washer made of aluminum or aluminum alloy in that the linear expansion coefficient is larger than the linear expansion coefficient of the glass plate and the pair of fastening members.

  A pair of tightening members, for example, when bolts and nuts are tightened, the bolts and nuts and the joining members expand more than the glass plate at a higher temperature than during tightening, but they are made of aluminum or aluminum alloy. Since the flat washer further expands and fills the gap formed between the glass plate and the bolt / nut, the fluctuation in the axial force of the bolt is reduced.

  Also, at lower temperatures than when tightening, the bolts and nuts and the joining member shrink more than the glass plate, so the force in the bolt axial direction acting on the glass plate becomes stronger, but it is made of aluminum or aluminum alloy. The flat washer further contracts and functions to reduce an increase in force in the bolt axial direction, so that fluctuations in the axial force of the bolt are reduced.

  In this way, after tightening bolts and nuts, etc., by using a flat washer made of aluminum or aluminum alloy, which has a larger linear expansion coefficient than glass and bolts and nuts, and steel and stainless steel, which are the materials of joint members A stable joint force with little change in the force in the bolt axis direction was obtained with respect to the temperature change.

  Further, when disassembling the joint structure, the bolts and nuts may be loosened, so disassembly is easy.

  The glass plate joining structure and joining method according to the present invention includes a plain washer sandwiched between a glass plate and a metal plate that is a joining member, for example, a bolt / nut or a screw / nut fastening force that is a pair of fastening members. It is communicated through and joined.

  The glass plate joining structure and joining method of the present invention will be described with reference to the drawings.

  First, a glass plate bonding structure and a glass plate bonding portion according to the present invention in which a glass plate and a metal plate are bonded will be described.

  FIG. 1A is an enlarged side view of an example of a bonded portion of a glass plate and a metal plate by the glass plate bonding structure and bonding method of the present invention. The parts other than the bolt 3 and the nut 4 are shown in a cross section at the joint. FIG. 1B is a top view of the plate glass through-hole portion with which a flat washer is brought into contact.

In the present invention, as shown in FIG. 1A, a glass plate G having a through-hole and a metal plate 2 as a joining member are overlapped, and a bolt 3 and a nut 4 as a pair of fastening members inserted through the through-hole. The glass plate G is bonded to the glass plate G by the force generated by the tightening of the glass plate G, and the Young's modulus is 6.70 × 10 ⁴ MPa or more and 7.30 × 10 ⁴ MPa or less. The flat washer 1 having a linear expansion coefficient larger than the linear expansion coefficient of the glass plate and the pair of fastening members and having an inner diameter of 1.0 mm or more larger than the diameter of the through hole of the glass plate G is the glass plate G and the joining member. A glass plate joining structure characterized by being sandwiched between a metal plate 2.

  Specifically, as shown in FIG. 1A, a bolt 3 is passed through a glass plate G and a metal plate 2 provided with a flat washer 1 and a through hole, and the flat washer 1 is sandwiched between the glass plate G and the metal plate 2. Then, the nut 4 is joined to the bolt 3, and the bolt 3 and the nut 4 which are a pair of fastening members are fastened to be joined and integrated by a force in the bolt axial direction. The washer 5 in FIG. 1A was used so that the bolt 3 and the nut 4 can be easily tightened.

  As shown in FIG. 1 (B), the plate glass bonding structure of the present invention has a flat washer 1 whose inner diameter is larger than the diameter of the through hole of the glass plate in order to avoid the end 6 of the through hole of the glass plate G. As shown in FIG. 1A, they were pressed so as to be concentric.

  FIG. 2 is an enlarged side view of an example of a bonded portion between glass plates by the glass plate bonding structure and the bonding method of the present invention. The parts other than the bolt 3 and the nut 4 are shown in a cross section at the joint.

As shown in FIG. 2 (A), the present invention is a force generated by tightening bolts 3 and nuts 4 which are a pair of tightening members that are overlapped with glass plates G1 and G2 each having a through hole and inserted into the through hole. It is the joining structure of the glass plates which joined glass plates, ie, glass plate G1, G2, Comprising: Young's modulus is 6.70 * 10 < ⁴ > MPa or more, 7.30 * 10 < ⁴ > MPa or less, and a linear expansion coefficient is A flat washer 1 that is larger than the linear expansion coefficient of the glass plate and the pair of fastening members and whose inner diameter is 1.0 mm or more larger than the diameter of the through hole of the glass plates G1 and G2 is pressed against the glass plates G1 and G2 and the glass plate G1. A glass plate joining structure characterized by being sandwiched between G2.

  Specifically, the flat washer 1 and the glass plates G1 and G2 provided with through holes are bolted through the flat washer 1 to the glass plates G1 and G2, and the flat washer 1 is sandwiched between the glass plates G1 and G2. The nuts 4 are combined with the bolts 3 and integrated with the bolt axial force generated by tightening the bolts 3 and 4 as a pair of fastening members. The washer 5 was used so that the bolt 3 and the nut 4 could be easily tightened.

  In the joining structure and joining method of the glass plate of the present invention, in order to prevent cracking when the bolt 3 / nut 4 or screw / nut is tightened, the flat washer is obtained from the diameter of the through hole of the plate glass G, G1, G2. 1 is increased by 1.0 mm or more, preferably 4.0 mm or more. In other words, the distance from the end 6 of the through hole of the plate glass G, G1, G2 to the flat washer 1 is 0.5 mm or more, preferably 2.0 mm or more.

  If the plate glass G, G1, G2 is a tempered glass plate, it is possible to use hard steel (steel) or stainless steel for the flat washer 1 and tighten it with bolts 3 and nuts 4. When the finishing accuracy is poor and there is deformation, etc., if the glass plates G, G1, and G2 are raw glass that has not been tempered, at the interface between the flat washer 1 and the glass plates G, G1, and G2 when tightened Local force is applied and easily damaged.

  If a flat washer 1 with a Young's modulus close to that of soda lime silicate glass is used, the flat washer 1 will be appropriately deformed, in other words, it will be moderately adapted and a buffering effect will be produced, and at the interface between the glass plates G, G1, G2 and the flat washer Local force is applied to prevent damage. This is true even if the glass plates G, G1, and G2 are tempered glass plates. If a flat washer 1 having a Young's modulus close to that of soda lime silicate glass is used, no local force is generated when the glass plate G, G1, G2 is pressed. Thus, if the Young's modulus of the glass plates G, G1, G2 and the flat washer 1 is close, the flat washer 1 is appropriately deformed. In other words, the glass plate G, It can suppress that a local force is added and damaged at the interface between G1, G2 and the flat washer 1.

Usually, the Young's modulus of soda lime silicate glass used for general purposes such as construction is 7.16 × 10 ⁴ MPa. Therefore, it is preferable to use the flat washer 1 made of a material having a Young's modulus of 6.70 × 10 ⁴ MPa or more and 7.30 × 10 ⁴ MPa or less. Preferably, it is 6.80 × 10 ⁴ MPa or more and 7.20 × 10 ⁴ MPa or less.

Examples of the metal material include aluminum having a Young's modulus of 6.86 × 10 ⁴ MPa or an aluminum alloy containing aluminum as a main component, which is preferable for use in the bonding structure and bonding method of the glass plate of the present invention. This is a material for the flat washer 1. Among aluminum alloys, aluminum alloys such as alloy numbers 5052, 5454, and 7075 are easily available, and are preferable materials for the flat washer 1 used in the sheet glass bonding structure and the bonding method of the present invention.

  Furthermore, by using a flat washer 1 made of aluminum or aluminum alloy having a larger linear expansion coefficient than steel and stainless steel as materials of glass G, G1, G2 and metal plate 2, bolt 3 and nut 4, bolt 3 A stable joining force with little change in the force in the bolt axis direction with respect to the temperature change after tightening the nut 4 can be obtained.

The linear expansion coefficient of the plain washer 1 is greater than the linear expansion coefficient of 17 × 10 ⁻⁶ / ° C. of SUS304, which is stainless steel having a large linear expansion coefficient among the materials of the bolt 3 and the nut 4 that are a pair of fastening members. The aluminum or aluminum alloy having a linear expansion coefficient of 18 × 10 ⁻⁶ / ° C. or higher and 26 × 10 ⁻⁶ / ° C. or lower (−50 ° C. to 200 ° C.) is a preferable material for the flat washer 1.

  Alternatively, a flat washer 1 made of aluminum or aluminum alloy and a flat washer 1 made of steel or stainless steel may be used in an overlapping manner. At that time, it is preferable to use a flat washer 1 made of aluminum or aluminum alloy on the side pressed against the glass plate.

  FIG. 3 is a top view of an example of plate glass bonded by the glass plate bonding structure and bonding method of the present invention.

  As shown in FIG. 3, glass plates G1, G2, and G3 were connected via a metal plate 2 that is a joining member. At this time, if the glass plate is provided with different angles, for example, the metal plate 2 is L-shaped and the glass plate is connected in a right angle direction, the present invention can be used in the manufacture of buildings, furniture, articles and the like using the glass plate. The glass plate joining structure and joining method thereof are widely used.

  Moreover, in the joining structure and joining method of the glass plate of this invention, it is used as a joining method of steel structures, such as a bridge and a building, 60 kN or more by the bolt 3 and nut 4 used by high strength bolt friction joining. Even when the glass plate was tightened with a force in the bolt axis direction, in other words, a force of 60 kN or more generated by tightening the pair of stress members, the glass plate was not damaged, and a strong bonding strength was obtained. If the force generated by tightening the pair of stress members is greater than 300 kN, there is a risk of breakage even if the glass plate has the inherent high rigidity. If it is tightened with the above-described force in the bolt axis direction, it can be used for architectural purposes such as bonding of rib glass of a rib glass screen.

  At this time, by reducing the diameter of the through hole of the plain washer 1 which is a stress generating member than the head of the bolt 3 and the outer diameter of the nut 4, for example, the stress is larger than the outer diameter of the bolt 3 head and nut 4. By reducing the inner diameter of the flat washer 1 as the generating member, a force in the bolt axial direction of 60 kN or more is reliably transmitted to the glass plate via the flat washer 1, and the glass plate and the metal plate as the connecting member are firmly connected. To be joined. Normally, in the hexagon bolt and nut, the maximum outer diameter of the bolt 3 head and the nut 4 is called a diagonal distance. In order to transmit a strong tightening torque, it is preferable to use hexagon bolts and nuts, and among them, high-strength bolts and nuts for friction joining used in construction are preferably used. In order to obtain a strong force of 60 kN or more and 300 kN or less in the bolt axis direction by tightening bolt 1 and nut 2, high strength hexagon bolts and nuts, in other words, high strength hexagon bolts with a mechanical property grade of F8T or more It is preferable to use hexagon bolts / nuts or torcia-type high strength bolts with nuts or strength divisions of 8.8, 10.9, 12.9, and high strength for friction joining used in construction. Bolts and nuts, in other words, high strength hexagon bolts and nuts having a mechanical property grade of F8T or higher are preferably used. The grade of high-strength hexagon bolts, nuts, and washers according to mechanical properties conforms to JIS B1186-1995 “Set of high-strength hexagon bolts, nuts and plain washers for friction joining”.

  In the glass plate bonding structure and method of the present invention, the glass plate G to be fastened by a pair of fastening members via the plain washer 1 is a glass plate manufactured by a float method, tempered glass, double strength glass, heat ray. Examples thereof include absorption glass, heat ray reflective glass, glass plates subjected to various surface treatments, and laminated glass using these glasses. In the case of laminated glass, the glass plate joining method of the present invention is applied to one glass plate constituting the laminated glass, avoiding the intermediate film, and plain washers are applied to the other glass plates that are not involved in the joining. It is preferable to drill a through-hole having a diameter larger than the outer diameter and perform countersink hole processing for the flat washer 1.

  Moreover, as a joining member used in the joining structure and joining method of the glass plate of this invention, it is easy to process and is chosen from the metal plate 2 which is hard and highly rigid, Preferably it is a steel plate, Preferably, it is JIS G 3101. SS400 etc. based on 2004 “General Structural Rolled Steel” is preferably used. In consideration of use in outdoor building applications, it is preferable to use a stainless steel plate material that hardly rusts and has little deterioration over time.

  In the present invention, the hole diameter is the maximum diameter of the through hole. When the through hole is circular, it means the diameter. In the present invention, in order not to generate a crack from the hole end, the shape of the glass plate G and the through hole of the stress generating member is preferably a circular shape that does not concentrate force on one point of the glass plate. As the flat washer 1 made of aluminum or aluminum alloy, a commercially available circular one is preferably used.

Examples of the present invention will be described below.

(Measurement of temperature dependence of force in the bolt axis direction)
First, the temperature dependency of the force in the bolt axis direction when an aluminum alloy was used for the flat washer 1 was measured.

  FIG. 4 is a plan view of the test piece for measuring the temperature dependence of the force in the bolt axis direction. The parts other than the bolt 3 and the nut 4 are shown in a sectional view.

  A tempered glass plate G having a thickness of 19 mm, a size, and a 300 mm × 300 mm square with a through hole having a diameter of 24 mm in the center was prepared. The tempered glass sheet G is subjected to air-cooling strengthening treatment after heating to the vicinity of the softening point and then air-cooling, in other words, rapidly cooling by blowing air and applying compressive stress to the surface.

As shown in FIG. 4, when a tempered glass plate G and a metal plate 2 as a joining member are joined, a washer is provided between a bolt 3 and a nut 4 as a pair of fastening members and the metal plate 2 as a joining member. 5 in between. Washer 5 is made of carbon steel S45C, nominal diameter, M20, thickness, 4.5 mm, outer diameter, 40 mm, inner diameter, 21 mm, mechanical property grade F35, linear expansion coefficient 11 × 10 ⁻⁶ / ° C. The thing of was used.

Further, the flat washer 1 is sandwiched between the tempered glass G and the metal plate 2 so as not to apply a force in the bolt axial direction by tightening the bolt 3 and the nut 4 to the end 6 of the through hole of the glass plate G. It is. The flat washer 1 is made of an aluminum alloy (alloy number 5052), nominal diameter, M30 plain washer, thickness 4.0 mm, outer diameter, 58 mm, inner diameter, 40 mm, Young's modulus 7.03 × 10 ⁴ MPa, wire The one having an expansion coefficient of 23.8 × 10 ⁻⁶ / ° C. was used.

Between these nominal diameters, the M20 washer 5 and the M30 plain washer 1, a hole with a diameter of 10 mm and a diameter of 24 mm for inserting the bolt 3 is made of SS400 and has a linear expansion coefficient of 12 × 10 ⁻⁶ / ° C. The metal plate 2 was sandwiched.

  A load washer 7 for measuring the force in the bolt axial direction was sandwiched between the metal plate 2 between the washer 5 and the flat washer 1 on the nut 4 side. The force in the direction of the bolt axis was measured using a crystal piezoelectric load washer 7 (model: 9041A) manufactured by KISLER and a charge meter (model: 5015A10) manufactured by KISLER (not shown).

  Next, the nut 4 is screwed into the bolt 3 having the tempered glass plate G and the metal plate 2 penetrated through the tempered glass plate G, and is first tightened with a torque of 150 N · m using a torque wrench. Was rotated 120 degrees, and three specimens were clamped according to the nut rotation method, but the tempered glass G was not damaged in all three specimens. The room temperature at this time was 20 ° C., and the force in the bolt axis direction generated by tightening the bolt 3 and the nut 4 was 201 kN on average.

  The reason why the glass plate G was not damaged by tightening with a force of 201 kN in the bolt axis direction was that the force in the bolt axis direction was not directly applied to the end portion 6 of the through hole of the glass plate G that was likely to crack. In addition, the generation and propagation of cracks are suppressed by the compressive stress at the compression site of the glass plate G, the apparent strength of the glass plate G is increased, and a flat washer made of an aluminum alloy having a Young's modulus close to that of glass. It is considered that the flat washer 1 was appropriately deformed by using 1 and, in other words, moderately adapted and buffered, and no local force was applied at the interface between the tempered glass plate G and the flat washer 1. .

  For bolt 3 and nut 4, a set of high strength hexagon bolts and nut washers for friction joining manufactured by NS Bolten Co., Ltd. was used. The bolt 3 has a nominal diameter, M20, length under the neck, 120 mm, diagonal distance, 37 mm, and the grade according to mechanical properties is F10T. The nut 4 has a nominal diameter, M20, diagonal distance, 37 mm, and the grade according to mechanical properties is F10.

  Next, after putting these three test pieces in a thermo-hygrostat whose temperature was adjusted to 20 ° C., the temperature was raised to 80 ° C. over 120 minutes at a speed of 0.5 ° C./sec. After holding the test piece for 60 minutes in an environment of ° C., the force in the bolt axis direction was measured again. At this time, the average value of the force in the bolt axis direction was 191 kN.

  Next, these three test pieces were cooled to −20 ° C. over 200 minutes at a speed of 0.5 ° C./second, held in a −20 ° C. environment for 60 minutes, and again, the bolt shaft Directional force was measured. The average value of the force in the bolt axis direction at this time was 203 kN.

For comparison, the flat washer 1 is made of S45C carbon steel, nominal diameter, M30, thickness, 5.5 mm, outer diameter, 60 mm, inner diameter, 31 mm, the mechanical property grade is F35, and Young's modulus is 210 × 10 ⁴ MPa. When three linear specimens were prepared and measured in the same manner with a linear expansion coefficient of 11 × 10 ⁻⁶ / ° C., the average force in the bolt axis direction was 205 kN at 80 ° C., 80 It was 189 kN at -20 ° C. and 209 kN at −20 ° C.

  Table 3 shows the measurement results of the force in the bolt axis direction at each of the above temperatures. Furthermore, the force in the bolt axis direction at −20 ° C. and 80 ° C. was compared with the rate of change expressed as a percentage based on the force in the bolt axis direction at 20 ° C.

  Compared to the case of using a flat washer 1 made of S45C, the temperature of the flat washer 1 made of an aluminum alloy (alloy number 5052) having a large linear expansion coefficient is 20 ° C., which is the temperature at which the bolt 3 and nut 4 are tightened. The rate of change of the force in the bolt axial direction when the environmental temperature was lowered to -20 ° C. or increased to 80 ° C. with respect to the force in the bolt axial direction at that time was small. Specifically, when a flat washer 1 made of an aluminum alloy (alloy number 5052) is used, the increase in change rate at −20 ° C. is + 1%, and the decrease in change rate at 80 ° C. is −5%. When the flat washer 1 was used, the increase in change rate at −20 ° C. was + 2%, and the decrease in change rate at 80 ° C. was −8%.

  This is because a flat washer 1 made of an aluminum alloy (alloy number 5052) having a linear expansion coefficient larger than that of the glass plate G and the bolt 3 is used for the flat washer 1. Compared to tightening at ℃ (room temperature), the bolt 3 shrinks more than the glass plate G at -20 ℃ (low temperature), so the distance between the bolt 3 and the nut 4 is narrowed. A flat washer 1 made of an aluminum alloy (alloy number 5052) having a larger linear expansion coefficient changes its shape with a reduced thickness so as to fill the narrowing of the gap, and the bolt axial direction acting on the glass plate G This is because the increase in power was suppressed.

  Compared to when bolt 3 and nut 4 are tightened at 20 ° C. (normal temperature), bolt 3 extends more than glass plate G at 80 ° C. (high temperature). The flat washer 1 made of an aluminum alloy (alloy number 5052) having a linear expansion coefficient larger than that of the bolt 3 is changed in shape to increase the thickness, so that the gap is widened. This is because the acting force in the bolt axis direction is suppressed from being weakened.

By using the flat washer 1 made of an aluminum alloy (alloy number 5052), stable joining with little change in the force in the bolt axial direction was obtained with respect to the temperature change after the bolt 3 and nut 4 were tightened.
(Measurement of bonding force by tensile shear test using universal material testing machine)
Subsequently, in order to measure the bonding force per place in the bonding structure of the plate glass of the present invention, a tensile shear test was performed with a universal material testing machine.

FIG. 5 is a front view when performing a tensile shear test with a universal material testing machine.
6A and 6B are side views when a tensile shear test is performed using a universal material testing machine, in which FIG. 6A is a side view of a bolt tension fitting and FIG. 6B is a side view of a glass tension fitting.

  Using a universal material testing machine (Orientec Co., Ltd., model UCT-10T), as shown in FIG. 5 and FIG. When joining G and a metal L-shaped member 8 as a joining member, a washer 5 is sandwiched between the bolt 3 and nut 4 as a pair of fastening members and the metal L-shaped member 8. . The washer 5 was made of S45C carbon steel, and the nominal diameter, M20, thickness, 4.5 mm, outer diameter, 40 mm, inner diameter, 21 mm, and mechanical properties of F35 were used.

In addition, a force in the bolt axial direction by tightening the bolt 3 and the nut 4 on the end 6 of the through hole of the tempered glass plate G as a stress generating member between the tempered glass plate G and the metal L-shaped member 8. As the flat washer 1 sandwiched in order to prevent the addition of steel, one having a nominal diameter of M30 made of an aluminum alloy (alloy number 5052), a thickness of 4.0 mm, an outer diameter of 58 mm, an inner diameter of 30 mm was used. The Young's modulus of this flat washer 1 made of an aluminum alloy (alloy number 5052) is 7.03 × 10 ⁴ MPa, and the linear expansion coefficient is 23.8 × 10 ⁻⁶ / ° C. (20 to 100 ° C.).

  An L-shaped member 8 made of SS400 having a hole of 15 mm thickness and 24 mmφ for inserting a bolt was sandwiched between the washer 5 of M20 and the flat washer 1 of M30.

  Next, the tempered glass plate G and the L-shaped member 8 were fastened with bolts 3 and nuts 4.

  For bolt 3 and nut 4, a set of high strength hexagon bolts and nut washers for friction joining manufactured by NS Bolten Co., Ltd. was used. The bolt 3 has a nominal diameter, M20, length under the neck, 100 mm, diagonal distance, 37 mm, and a grade according to mechanical properties is F10T. The nut 4 has a nominal diameter, M20, diagonal distance, 37 mm, and the grade according to mechanical properties is F10.

  The nut 4 is screwed into the bolt 3 penetrated through the tempered glass plate G, and after first tightening with a torque wrench with a torque of 150 N · m, the nut 4 is rotated 120 degrees therefrom and tightened according to the nut rotation method. The tempered glass plate G was not damaged. At this time, the force in the bolt axial direction generated by the bolt 3 due to the tightening of the bolt 3 and the nut 4 was an average of 201 kN.

  Next, as shown in FIG. 5 and FIG. 6 (A), the tempered glass plate G is joined to the reinforced glass plate G with a force in the direction of the bolt axis of an average of 201 kN using the high-strength hexagon bolt 3 and the nut 4 via the plain washer 1. The pair of L-shaped members 8 are joined to the bolt tension fitting 9 with the bolt 10 and then connected to a universal material testing machine load cell (not shown). As shown in FIG. The tempered glass plate G was sandwiched and fixed with bolts 12, and the glass tension fitting 11 was connected to a universal material testing machine fixing fitting (not shown). Using a universal material testing machine, the bolt tension fitting 9 and the glass tension fitting 11 are pulled up and down as shown by the arrows in FIGS. 5 and 6, and a plain washer 1, bolt 3 and nut 4 measured the load when the sliding movement started as the joining force per one place of the main joining. The measurement of bonding force was performed on three test pieces. The measurement results were 52 kN, 65 kN, and 58 kN, and the average value was 58 kN.

Thus, a high-strength hexagon bolt with a nominal diameter of M20 is as follows. When the nut 4 was used to join the present joining method with an average force of 201 kN in the bolt axial direction, a joint that could withstand an average shearing force of 58 kN was obtained. If the shear force of 58 kN or more does not act on the joint part on average, the bolt 3 does not come into contact with the through hole of the tempered glass sheet G, in other words, the bolt insertion hole. A bonded structure with high bonding strength that does not come into contact with G was obtained.
(Load test of the joint structure of the present invention)
Subsequently, when using the bonding structure of the glass plate and the bonding method of the present invention for rib glass, a load resistance test for confirming whether a bonding strength sufficient for practical use was obtained was performed. Specifically, a load resistance test was performed on the joint portion between the tempered glass plate G and the L-shaped member 8 by the glass plate joining structure and the joining method of the present invention.

  First, the glass test piece used for the load bearing test will be described. The dimensions of the tempered glass plate G used in the load-bearing test are the plate thickness, 19 mm, width 500 mm, and length 2000 mm. Bolt through-holes with a diameter of 24 mm are provided at positions of 100 mm in the width direction and 100 mm in the length direction from the corners, and further, through this through-hole, an interval of 300 mm in the width direction of the tempered glass sheet G and 200 mm in the length direction. At four intervals, four through holes for inserting bolts with a diameter of 24 mm were provided.

  FIG. 7 is an explanatory view showing a load resistance test method for a glass plate bonding structure according to the present invention, (A) is a side view of the load resistance test apparatus, and (B) is a top view.

  As shown in FIGS. 7A and 7B, the bolt 3 having a nominal diameter of M20 is used at the joint between the tempered glass plate G and the L-shaped member 13, and the fixed end of the tempered glass plate G is used. On the side, through holes were formed so as to have an interval of 300 mm in the width direction, an interval of 200 mm in the length direction of the glass, and a diagonal length of 360 mm, and four joint portions were provided.

  In the glass plate joining structure of the present invention, the shearing force F acting on each joint portion is expressed by the equation (1) with respect to the external force W applied to the opposite end of the glass fixing end as shown in FIG. Is calculated by

  The joint force per joint can withstand a shearing force of about 58 kN, but the joint force may vary due to variations in the axial force of the bolt 3 and relaxation of the axial force of the bolt 3. Therefore, in consideration of safety, a load resistance test was performed with a bonding force per one joint, in other words, a shearing force acting per one joint according to the present invention set to 50 kN. In the formula (1), when 50 kN is substituted for F and the external force W at the opposite end of the glass fixing end that maintains the bonding structure is calculated, W = 20 kN.

  As shown in FIGS. 7A and 7B, a pair of L-shaped members 13 made of SS400 having a thickness of 12 mm and fixed to the fixing wall 14 with bolts 15 are connected to a bolt 3, a nut 4, and a washer. 5 and the flat washer 1 were used to fix the ends of the tempered glass plate G so as to have the glass plate joining structure of the present invention.

  Bolt 3 uses nominal diameter, M20, length under head 120 mm, mechanical property grade, F10T, and nut 4 uses nominal diameter, M20, mechanical property grade, F10T. As the washer 5, a nominal diameter, M20, a thickness of 4.5 mm, an outer diameter, 40 mm, an inner diameter, 21 mm, and a mechanical property grade F35 were used.

Further, the tempered glass plate G and the L-shaped metal plate 13 are pressed against the tempered glass plate G without applying a force in the bolt axial direction by tightening the bolt 3 and the nut 4 to the through hole of the tempered glass plate G. The flat washer 1 sandwiched between them is an aluminum alloy (alloy number 5052) nominal diameter, M30 plain washer, thickness 4.0 mm, outer diameter, 58 mm, inner diameter, 40 mm, and Young's modulus of 7.03 × 10. ^{The one having 4} MPa and a linear expansion coefficient of 23.8 × 10 ⁻⁶ / ° C. was used.

  The nut 4 was screwed into the bolt 3 and first tightened with a torque wrench with a torque of 150 N · m, and then the nut 4 was rotated 120 degrees therefrom and tightened according to the nut rotation method. In addition, the force in the bolt axial direction generated by tightening the bolt 3 and the nut 4 at this time is an average of 201 kN.

  In the load resistance test apparatus shown in FIG. 7, a load W of 0 to 20 kN was applied to the opposite end to which the tempered glass plate G was fixed using a hydraulic jack (not shown) in the direction of the arrow in FIG. The vertical displacement of the bolt 3 at the joint 16 and the vertical displacement of the tempered glass sheet G directly above the joint 16 are measured, and the bolt displacement is determined from the vertical displacement of the tempered glass sheet G. A value obtained by subtracting the amount of displacement in the vertical direction was measured as the amount of slip of the tempered glass sheet G.

  Although the load W was applied up to 20 kN, the displacement amounts of the bolt 3 and the tempered glass plate G were almost equal, and no slip occurred. Moreover, the tempered glass plate G was not damaged. In other words, a rib glass structure capable of withstanding an external force of 20 kN was obtained.

  When this test result is compared with the fixing method of the conventional glass panel which adhere | attaches a glass plate and a joining member, in the Example of patent document 1, the length of a tempered glass plate is 1719 mm, the width | variety of a fixed end is 325 mm, It is described that the glass broke at about 9.8 kN (1000 kgf) when the width of the tip (load load side) was 244 mm, the thickness was 19 mm, and three male screw members were inserted at a pitch of 100 mm. Considering the moment length, which is the distance from the joint to the part to which the load is applied, compared to the load resistance test of this joint, the test results of the glass joint structure of the present invention show that the moment length is long and The tempered glass sheet G did not slide in spite of a severe test in which a load of 20 kN was applied. Moreover, the tempered glass plate G was not damaged.

  As a result of the load resistance test of the glass plate joint structure of the present invention, the tempered glass plate G, the plain washer 1 and the pair of L-shaped members 13 are flat washer due to the force in the bolt axial direction by tightening the bolt 3 and nut 4. 1, even if a load acts on the opposite side of the fixed end, the sliding displacement of the tempered glass sheet G is less likely to occur. Compared to the conventional bonding method of bonding the glass plate and the bonding member, It was found that the joint strength at the joint was improved.

  In the glass plate bonding structure and method of the present invention, a rubber or resin spacer (not shown) is used for positioning when the glass plate through hole and the flat washer 1 are arranged concentrically. Is placed in the space of the through hole, the distance between the inner diameter of the flat washer 1 and the outer diameter of the bolt insertion hole of the glass plate can be kept constant. Therefore, it is preferable to insert a spacer made of rubber or resin. . In addition, when slippage occurs at the joint portion due to an external force acting between the bolt insertion hole of the glass plate and the shaft portion of the bolt 3, the through hole of the glass plate and the bolt 3 are directly connected. It is preferable to insert a spacer made of rubber or resin, because the shaft portion of the material is buffered without being touched and destruction is suppressed.

  In addition, in the conventional glass panel fixing method for bonding the glass plate and the bonding member, the glass plate is damaged before the glass plate starts to slide, so the bonding strength cannot be increased by increasing the number of bondings. However, in the glass plate bonding structure and the bonding method of the present invention, it is possible to easily increase the bonding strength by increasing the number of bondings or increasing the bonding pitch.

  From this, for example, when constructing a glass screen, the rib glass as a standing glass used for supporting the surface glass forming the glass screen is lengthened, and when joining and supporting the upper end portion of the present invention, the rib glass is joined. It has been found that the use of the glass plate bonding structure and the bonding method is advantageous in that the bonding strength is higher than the conventional glass panel fixing method in which the glass plate and the bonding member are bonded. In other words, if the bonding strength of the glass plate of the present invention and the bonding method of the present invention is used for the rib glass if the bonding strength is the same as that of the conventional bonding method, the width of the rib glass can be shortened. In addition, since the bonding strength can be made higher than the conventional bonding method by widening the number of bondings and the bonding interval, it is possible to increase the interval between the rib glasses used for supporting the surface glass forming the glass screen. It was found that the screen has high visibility and can create a more open space.

  Using the glass plate joining structure and joining method of the present invention, specific furniture includes glass tables and crow cabinets, building articles include glass partitions, buildings include glass screens, glass walls, glass roofs, It is used for large buildings such as glass screens with an opening configuration using large plate glass. For example, instead of a conspicuous metal stand, an inconspicuous glass stand (rib glass) is used, and it can also be used for a rib glass screen by a glass stabilizer method that supports the wind load applied to the front glass (face plate). It is.

FIG. 1A is an enlarged side view of an example of a bonded portion of a glass plate and a metal plate by the glass plate bonding structure and bonding method of the present invention. FIG. 1B is a top view of the plate glass through-hole portion with which a flat washer is brought into contact. It is an expanded side view of an example of the junction part of the glass plates by the joining structure and joining method of the glass plate of this invention. It is a top view of an example of the plate glass joined by the joining structure and joining method of the glass plate of this invention. It is a top view of the test piece for measuring the temperature dependence of the force in the bolt axial direction. It is a front view at the time of performing a tensile shear test with a universal material testing machine. It is a side view at the time of carrying out the tensile shear test with a universal material testing machine, (A) is a side view of a bolt tension metal fitting, (B) is a side view of a glass tension metal fitting. It is explanatory drawing which shows the load bearing test method of the joining structure of the glass plate of this invention, (A) is a side view of a load bearing test apparatus, (B) is a top view.

Explanation of symbols

G, G1, G2, G3 Glass plate 1 Flat washer 2 Metal plate (joining member)
3 Bolt 4 Nut 5 Washer flat washer 6 End of through hole 7 Load washer 8 L-shaped member 9 Bolt pull metal fitting 10 Bolt 11 Glass pull metal fitting 12 Bolt 13 L-shaped member 14 Fixing wall 15 Bolt 16 Joint

Claims (6)

A glass plate having a through hole and a joining member are stacked, and the glass plate and the joining member are joined by a force generated by fastening a pair of fastening members inserted through the through hole, and the Young's modulus is 6. 70 × 10 ⁴ MPa or more and 7.30 × 10 ⁴ MPa or less, the linear expansion coefficient is larger than that of the glass plate and the pair of fastening members, and the inner diameter is 1.0 mm larger than the diameter of the through hole of the glass plate. A glass plate joining structure comprising a large flat washer sandwiched between a glass plate and a joining member. A glass plate joining structure in which glass plates having through-holes are overlapped and the glass plates are joined by a force generated by fastening a pair of fastening members inserted through the through-holes, and the Young's modulus is 6.70 × 10 ^4. A plain washer having a linear expansion coefficient larger than that of the glass plate and the pair of fastening members and having an inner diameter of 1.0 mm or more larger than the diameter of the through hole of the glass plate at a MPa of 7.30 × 10 ⁴ MPa or less. A glass plate joining structure, wherein the glass plate is pressed and / or sandwiched between glass plates. 3. The glass joining structure according to claim 1, wherein the plain washer is made of aluminum or aluminum alloy. The glass plate bonding structure according to any one of claims 1 to 3, wherein the flat washer is disposed concentrically with respect to the through hole of the glass plate. A glass plate and a joining member that overlap with a glass plate having a through hole, and a glass plate and the joining member are joined by a force generated by fastening of a pair of fastening members inserted through the through hole. 70 × 10 ⁴ MPa or more and 7.30 × 10 ⁴ MPa or less, the linear expansion coefficient is larger than that of the glass plate and the pair of fastening members, and the inner diameter is 1.0 mm larger than the diameter of the through hole of the glass plate. A glass plate joining method, wherein a large plain washer is sandwiched between a glass plate and a joining member. A glass plate joining method in which glass plates having through-holes are overlapped and the glass plates are joined together by a force generated by fastening a pair of fastening members inserted through the through-holes, and the Young's modulus is 6.70 × 10 ^4. A plain washer having a linear expansion coefficient larger than that of the glass plate and the pair of fastening members and having an inner diameter of 1.0 mm or more larger than the diameter of the through hole of the glass plate at a MPa of 7.30 × 10 ⁴ MPa or less. A method for joining glass plates, characterized in that a glass plate is pressed and / or sandwiched between glass plates.

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