Back mullion bonding structure of curtain wall

Abstract

To easily and reliably adhere a metallic back mullion for supporting a face glass.SOLUTION: A curtain wall having an outer wall formed by joining a plurality of face glasses in a lateral direction comprises: a metal back mullion bonded to a back side of a joint portion of the face glasses to support the face glasses; a right adhesive anchor made of silicone and structurally sealed with the left end of the back surface of the face glass; a left adhesive anchor made of silicone and structurally sealed with the right end of the back surface of the adjacent face glass; and a holder frame fixed to the back mullion and held from the back side by being fitted to the right adhesive anchor and the left adhesive anchor. The curtain wall can be supported by the back mullion which is difficult to adhere to the face glass by using the adhesive anchor which is easy to adhere to the face glass.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a structure for bonding metal back mullions to support a curtain wall, an exterior wall formed by arranging a plurality of glass sheets. [Background technology]

[0002] A curtain wall is an exterior wall attached to the framework of a building. It is a non-load-bearing wall that does not support the weight of the building, but by having the columns and beams bear the weight of the building, it is possible to make the wall entirely glass-walled or to create large openings. In addition to blocking wind, rain, noise, etc. from the outside, curtain walls also have the effect of earthquake resistance, wind pressure resistance, insulation, fire resistance, and preventing condensation.

[0003] There are various types of curtain walls, including the panel type, in which glass panels are lined up, and the mullion type, in which glass is fitted between mullions. There is also the back-mullion type, in which mullions (ribs) are placed on the back side (inside the room) of the face glass to eliminate the vertical frames (sashes) between the glass pieces and make it appear as if the glass is connected horizontally.

[0004] Patent Document 1 discloses an invention for an earthquake-resistant glass screen structure that has a simple structure and can be constructed in a short period of time. Considering adhesion to the face glass, it is desirable to use glass for the mullions as well, but the mullions must be extended to some extent to support the face glass.

[0005] However, if the mullions are visible from the outside, it can affect the design, so the mullions are shortened so that they are not visible from the outside, but some mullions are made of metal so that they can still support the face glass even when the mullions are shortened.

[0006] As described in Patent Document 2, an invention is disclosed in which the effective surface area of ​​the connecting glass can be prevented from being reduced, the connecting glass can stably support the face glass, the workability when holding the connecting glass to the upright can be improved, and further, interlayer displacement between the face glass and the upright can be sufficiently tolerated to increase earthquake resistance.

[0007] Furthermore, as described in Patent Document 3, an invention has been disclosed for a glass screen structure in which rigidity is increased by using a metal rib body and adhesion is improved by bonding the adhesive glass piece and the face glass with a sealant. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Patent No. 6075545 [Patent Document 2] Patent No. 4410810 [Patent Document 3] Patent No. 4904469 Summary of the Invention [Problem to be solved by the invention]

[0009] Even if you try to fix the face glass and metal mullion with a sealant such as glass adhesive, the adhesive strength is weak, so connecting glass is used. Even if you try to bond the face glass and connecting glass by placing the connecting glass inside the holder frame of the metal mullion, if a single piece of glass becomes large, the back mullion will also become vertically long, making it difficult to install on site.

[0010] For this reason, the connecting glass is divided into multiple pieces and inserted from the top of the holder frame, but if there is a gap between the thin glass pieces and the holder frame, they may get caught at an angle.It is also difficult to keep the glass pieces locked in the holder frame in order to bond them to the face glass.

[0011] If silicone material is used instead of glass pieces, the adhesive strength with glass adhesive can be ensured and it can be processed into complex shapes, so it can be molded to fit the shape of the holder frame in advance and fitted.

[0012] Therefore, an object of the present invention is to provide a back mullion adhesive structure for curtain walls that allows for simple and reliable adhesion of metal back mullions for supporting face glass. [Means for solving the problem]

[0013] In order to solve the above problems, the back mullion adhesive structure of the present invention for a curtain wall is characterized in that, in a curtain wall in which an exterior wall is formed by joining multiple face glass pieces together horizontally, it comprises a metal back mullion that is adhered to the back side of the joint to support the face glass, a silicone right adhesive anchor that is structurally sealed to the left end of the back side of the face glass and a silicone left adhesive anchor that is structurally sealed to the right end of the back side of the adjacent face glass, and a holder frame that is fixed to the back mullion and fits into the right adhesive anchor and left adhesive anchor to hold it from the back side, making it possible to support the face glass with the back mullion, which is difficult to adhere to, via the adhesive anchor that is easy to adhere to the face glass.

[0014] In the back mullion adhesive structure of the curtain wall, a paint cover is placed on the outside of the holder frame to match the color of the back mullion when painted.

[0015] In the back-mullion adhesive structure of the curtain wall, the holder frame is characterized in that it is formed with protrusions for engaging with the right adhesive anchor and the left adhesive anchor.

[0016] In the back-mullion adhesive structure of the curtain wall, the adhesive anchor has a flange that covers the upper surface of the holder frame, and the flange tapers toward the end side of the holder frame. [Effects of the Invention]

[0017] According to the present invention, in a curtain wall formed by arranging a plurality of face glass panes, when the back side is supported by a back mullion without using a sash between the face glass panes in order to improve the appearance from the outside, the face glass panes and the metal back mullion panes can be bonded together easily and reliably. [Brief explanation of the drawings]

[0018] [Figure 1] FIG. 1 is a perspective view showing a face glass and a back mullion having a back mullion adhesive structure of a curtain wall according to the present invention. [Figure 2] FIG. 1 is a cross-sectional view showing a face glass and a back mullion having a back mullion adhesive structure of a curtain wall according to the present invention. [Figure 3] FIG. 2 is an exploded view showing a face glass and a back mullion having a back mullion adhesive structure of the curtain wall of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0019] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. Components having the same functions are designated by the same reference numerals, and repeated description thereof may be omitted. [Example]

[0020] First, we will explain the back-mullion adhesive structure of the curtain wall of the present invention. Figure 1 shows face glass and back mullions with the back-mullion adhesive structure of the curtain wall, with (a) a perspective view from the front and (b) a perspective view from the back. The outside of the room is called the front, and the inside of the room is called the back.

[0021] As shown in Fig. 1, the curtain wall 100 is made up of a plurality of glass sheets arranged lengthwise and widthwise to form a face glass 200. The face glass 200 may have a double-skin structure consisting of an outer glass sheet and an inner glass sheet. The glass sheets may also be double-glazed glass with excellent heat insulation and sound insulation properties.

[0022] The glass sheets are not supported by metal sashes or other materials, but rather the joints 300 between adjacent glass sheets are butted together at both ends and sealed with adhesive or a coating material. For example, a highly weather-resistant weather seal can be used. This results in a continuous glass facade with inconspicuous joints at the joints 300.

[0023] To increase durability against wind pressure, etc., back mullions 400 are installed on the back side of the joint 300. Because the face glass 200 is supported from the rear, it is less visible from the outside, improving the appearance. In the case of a double-skin structure, the back mullions 400 are placed behind the outer glass.

[0024] The back mullions 400 are made of metal, such as steel. Glass mullions are easy to adhere to the face glass 200 with glass adhesive, but metal mullions are difficult to adhere. However, metal mullions can ensure earthquake resistance and negative pressure performance without having to extend the back mullions 400 as far back as glass mullions.

[0025] Furthermore, if the plate glass is thick, such as in double-glazed glass, the length will be short even if a metal mullion is used, making it difficult to see the back mullion 400 from the outside. If the back mullion 400 is shortened and the gap between the outer glass and the inner glass is narrowed, it will be possible to create a larger interior space.

[0026] Next, we will explain the adhesive structure 410 that fixes the glass face glass 200 and the metal back mullion 400 with adhesive or other materials. Fig. 2 is a cross-sectional view showing the face glass and back mullion with the back mullion adhesive structure of the curtain wall, and Fig. 3 is an exploded view thereof.

[0027] As shown in FIGS. 2 and 3, the adhesive structure 410 supports the face glass 200 with the back mullions 400, which are difficult to bond to the face glass 200, via adhesive anchors 600, which are easy to bond to the face glass 200.

[0028] The adhesive structure 410 uses a right adhesive anchor 600 made of silicone that is structurally sealed with the left end of the back surface of the face glass 200, a left adhesive anchor 600a made of silicone that is structurally sealed with the right end of the back surface of the adjacent face glass 200a, and a holder frame 500 that is fixed to the back mullion 400 and holds the right adhesive anchor 600 and left adhesive anchor 600a from the back side by fitting them together, for example by engaging protrusions 520 with grooves 610 formed in the right adhesive anchor 600 and left adhesive anchor 600a.

[0029] When double-glazed glass using two glass sheets 210, 230 is used as the face glass 200, 200a, an intermediate layer 220 is provided between the front glass sheet 210 and the rear glass sheet 230 to seal in air or the like. The intermediate layer 220 is secured with a spacer, and the edges are sealed with a sealant 250. A desiccant 240 or the like may be placed inside the sealant 250. Using double-glazed glass improves the effects of heat insulation, moisture prevention, sound insulation, and the like.

[0030] The upright face panes 200, 200a are aligned in a straight line, the left end face of the right face pane 200 is butted against the right end face of the left face pane 200a, a backup material 320 is sandwiched between them, and then the face panes 200 and 200a are bonded to the front side using a weather seal 310. The weather seal 310 is a resin sealing material that is highly waterproof even when affected by temperature changes, wind pressure, vibration, etc. The backup material 320 is a support material such as polyethylene foam used to reinforce and protect the seal.

[0031] An aluminum holder frame 500 is attached to the front surface (face glass side) of the back mullion 400 to hold the adhesive anchor 600. The holder frame 500 is long and extends vertically from the top to the bottom of the back mullion 400, and multiple screws 420 are inserted intermittently from top to bottom to fasten the frame 500 to the back mullion 400.

[0032] The adhesive anchor 600 is made by molding silicone (silicon resin). If glass is used, it can be processed into simple shapes such as a plate, but it is difficult to form protrusions or grooves.

[0033] It is also difficult to fit the plate-shaped glass into the holder frame 500 before installation, so the adhesive anchor 600 must be inserted from the top or bottom of the holder frame 500 on-site. However, if the anchor is too long, it will not fit, so the glass must be divided into multiple pieces and inserted. This can cause the glass pieces to be at an angle to the holder frame 500 or to get caught along the way.

[0034] By making adhesive anchor 600 out of resin, it can be molded to fit the housing portion 510 of holder frame 500, and it can be transported to the site already housed in holder frame 500. By fitting it in advance, there is no risk of errors occurring when installing it on site, such as it being misaligned from the desired position.

[0035] The holder frame 500 is divided into a right-side housing section 510 and a left-side housing section 510a, into which the right adhesive anchor 600 and the left adhesive anchor 600a are fitted, respectively. If the adhesive anchors are connected on the left and right, it will be necessary to drill holes for the screws 420 and to provide a plate to hold the adhesive anchor in place in the center.

[0036] By dividing the adhesive anchor into the right adhesive anchor 600 and the left adhesive anchor 600a, the screw 420 can be passed through the center of the holder frame 500, eliminating the need for a retaining plate and drilling holes in the adhesive anchor, making it easier to adjust the position for passing the screw 420 on site.

[0037] The right face glass 200 and the right adhesive anchor 600 are bonded together with a structural seal 800, and the left face glass 200a and the left adhesive anchor 600a are bonded together with a structural seal 800a. The structural seals 800 and 800a are, for example, a glass adhesive made of a silicone material.

[0038] Protrusions 520 are formed on the storage sections 510, 510a of the holder frame 500 to lock the adhesive anchors 600, 600a. The protrusions 520 may protrude inward from the ends (side and center) at the upper end and middle of the right storage section 510. The same applies to the left storage section 510a.

[0039] Because there are protrusions 520 at the top ends of storage sections 510, 510a, the effective width of structural seals 800, 800a is the distance between protrusions 520 on the side and protrusions 520 on the center. Protrusions 520 are made of metal, and structural seals 800, 800a are difficult to adhere to. Therefore, structural seals 800, 800a should be applied only to the effective areas using tape or similar, but on-site sealing often extends to the top surfaces of protrusions 520.

[0040] With respect to the protrusions 520, there are issues such as adhesive performance with the structural seal 800, limitations on dealing with thermal expansion, and different behavior of the seal joints, so three-sided adhesion can be avoided by applying a silicone release agent or the like to the protrusions 520 in advance. If three-sided adhesion occurs, the adhesive will be unable to follow distortion caused by vibrations and will be prone to cracking.

[0041] For this reason, the adhesive anchors 600, 600a are processed into a shape that protrudes upward from the accommodation portions 510, 510a of the holder frame 500, and the flange 620 is extended to cover the upper surface of the protrusion 520. This extends the effective width of the structural seals 800, 800a to the position where they connect with the side surfaces of the holder frame 500. Note that a backup material 810 is interposed between the right structural seal 800 and the left structural seal 800a.

[0042] The flange 620 may be tapered toward the end (side) of the holder frame 500. This makes it difficult to see the flange 620 when viewing the structural seal 800 from the side, and also makes it possible to absorb errors even if the structural seal 800 shrinks due to heat or other factors.

[0043] If the back mullions 400 are made of steel and the holder frame 500 is made of aluminum, they may appear to have different colors even when painted the same color. To match the appearance, the body of the holder frame 500 can be made of lightweight aluminum, and the outside can be covered with a paint cover 700 made of the same material as the back mullions.

[0044] According to the present invention, in a curtain wall formed by arranging a plurality of face glass panes, when the back side is supported by a back mullion without using a sash between the face glass panes in order to improve the appearance from the outside, the face glass panes and the metal back mullion panes can be bonded together easily and reliably.

[0045] The back mullion can be shortened, making it less visible from the outside. Also, when using a double-skin structure, the gap between the outer and inner glass can be narrowed.

[0046] By dividing the adhesive anchor into left and right halves and fitting them into the holder frame, stable support force can be ensured. Since it can be shipped from the factory already fitted into the holder frame, the amount of work is reduced. Because the support force from the fit is constant, the number of screws required to fasten the holder frame to the back mullion is also pre-patterned, reducing the labor required for design, manufacturing, and construction to about half of the previous amount. In addition, the amount of work required to manage construction errors is reduced. The adhesive anchor has a shape with no non-adhesive surfaces, so it can be fitted into the holder frame at any length. This improves the performance of the seismic joint and also reduces the amount of material used for structural seals.

[0047] The above describes the embodiments of the present invention, but the present invention is not limited to these. For example, by making the glass curtain wall sashless (without a metal frame), heat is less likely to be transmitted to the building, resulting in a glass facade with high thermal insulation properties.

[0048] When designing the joints of structural seals, there is a restriction that the difference between the thermal expansion of the glass and the thermal expansion of the joint must be within 30% of the joint width. If the plate glass is tall, it may be difficult to meet this joint restriction, but the holder frame is fixed to the back mullion with a vertical loose hole. From both a design and labor-hour perspective, the number of aluminum joints should be kept to a minimum, and adhesive anchors should be divided into lengths that make them easy to insert. [Explanation of symbols]

[0049] 100: Curtain wall 200: Face glass 200a: Face glass 210: Plate glass 220: Middle class 230: Plate glass 240: Desiccant 250:Sealing material 300: Joint 310: Weatherseal 320: Backup material 400: Back Mullion 410: Adhesive structure 420: Bis 500: Holder frame 510: Storage unit 510a: Storage unit 520: Protrusion 600: Adhesive anchor 600a: adhesive anchor 610: Groove 620: Flange 700: Painting cover 800: Structural seal 800a: structural seal 810: Backup material

Claims

1. In curtain walls, the exterior wall is formed by joining multiple face glass panels horizontally. a metal back mullion bonded to the back side of the joint to support the face glass; a right adhesive anchor made of silicone that is structurally sealed to a left end portion of the rear surface of the face glass, and a left adhesive anchor made of silicone that is structurally sealed to a right end portion of the rear surface of an adjacent face glass; a holder frame that is fixed to the back mullion and that is fitted into the right adhesive anchor and the left adhesive anchor to hold the back side; The adhesive anchor, which is easily bonded to the face glass, allows the back mullion, which is difficult to bond to the face glass, to support the glass. A back-mullion adhesive structure for curtain walls.

2. A paint cover is placed on the outside of the holder frame to match the color of the painted back mullion. The back-mullion adhesive structure of a curtain wall according to claim 1.

3. The holder frame is formed with protrusions for engaging with the right adhesive anchor and the left adhesive anchor. The back-mullion adhesive structure of a curtain wall according to claim 1.

4. The adhesive anchor has a flange that covers the upper surface of the holder frame, and the flange tapers toward an end of the holder frame. The back-mullion adhesive structure of a curtain wall according to claim 1.

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