Peripheral structure of mullions supporting a curtain wall

Abstract

To provide a peripheral structure for mullions supporting a curtain wall, in which the protruding area of ​​the mullion that supports the curtain wall, which extends inward, is surrounded by a wooden cover, thereby enhancing the aesthetic appeal while suppressing decay of the wooden cover caused by condensation that may occur. [Solution] This is a peripheral structure 100 for a mullion that supports a curtain wall, which constitutes the periphery of a protruding region 33 that protrudes inward from a metal mullion 30 to which a curtain wall 20 is attached. The outer circumferential surface 35 of the protruding region 33 is surrounded by a wooden cover 50, and multiple recesses 64 and multiple protrusions 62 extending in the longitudinal direction of the mullion are alternately arranged throughout the entire interface between the outer circumferential surface 35 of the protruding region 33 and the inner circumferential surface 52 of the wooden cover 50, with the recesses 64 facing the outer circumferential surface 35 of the protruding region 33.

Description

Technical Field

[0001] The present invention relates to a peripheral structure of a gable for supporting a curtain wall.

Background Art

[0002] The outer wall of a building in the form of a metal curtain wall is composed of a curtain wall formed by metal mullions (gables) and a spandrel, and panels (such as glass). Here, in addition to the metal curtain wall, there are also PC (Precast Concrete) curtain walls and the like for the curtain wall. Steel, aluminum, stainless steel, etc. are applied to the metal mullions (gables) and spandrels, and the application of such materials aims to reduce the weight of the curtain wall.

[0003] Here, in this specification, both the gable that serves as the base material for the outer wall of the building and the gable (mullion) provided in the curtain wall are referred to as "gable". Configurations in which the gable of the curtain wall is attached to the gable of the building, or configurations in which the gable of the building and the gable (mullion) of the curtain wall are integrally formed in advance (in other words, configurations in which the end of the curtain wall is attached to the gable of the building), etc. are included in the configurations in which the curtain wall is attached to the building. In addition, there are also configurations in which the gable and / or spandrel of the curtain wall are attached to beams of the building.

[0004] In order to stably support the curtain wall against external forces such as wind force acting on the curtain wall, the gable forming the outer wall generally enhances its rigidity by providing a protruding region that protrudes inwardly into the room. Therefore, the metal protruding region protruding inwardly into the room has become a factor that reduces the design quality (interior design) on the indoor side, and has become a problem as a trade-off for improving rigidity.

[0005] To address this issue of reduced aesthetic appeal, an interior structure is sometimes applied in which the protruding area of ​​the mullion is enclosed with a wooden cover. This wood-based interior design creates a sense of softness and warmth, eliminating the awkwardness caused by the mullion protruding into the interior.

[0006] Incidentally, metals such as aluminum have high thermal conductivity, and in winter when the outside air is cold, when the outdoor side of the mullion is cooled by the outside air, the protruding area that extends inward is also cooled, leading to condensation. If the protruding area is surrounded by a wooden cover as described above, the condensation that occurs adheres to the wooden cover, and the persistence of this condition causes the wooden cover to rot prematurely.

[0007] Therefore, a mullion perimeter structure is desired that enhances the aesthetic appeal of the mullion supporting the curtain wall by enclosing the protruding area that extends inward on the indoor side with a wooden cover, while also suppressing the decay of the wooden cover caused by condensation that may occur.

[0008] Here, Patent Document 1 proposes a joining structure for joining materials. This joining structure is a joint in which a first joining material made of metal and a second joining material made of wood material or resin material are bonded together between their respective joining surfaces via an elastic adhesive layer of a certain thickness. At least one of the joining surfaces of the first or second joining material has a groove formed therein that extends in a certain direction and is filled from the opening side with at least excess adhesive from the adhesive layer. The first joining material is, for example, a mullion, and the second joining material is, for example, a mullion exterior material made of wood material. The mullion exterior material is provided with a groove, and the mullion and the mullion exterior material are joined together as the adhesive layer fills the groove. [Prior art documents] [Patent Documents]

[0009] [Patent Document 1] Japanese Patent Publication No. 2004-60223 [Overview of the project] [Problems that the invention aims to solve]

[0010] Even in the joining structure of the joining material described in Patent Document 1, that is, the joining structure of the mullion exterior material made of wood material, it is difficult to resolve the problem of the mullion exterior material decaying prematurely due to the adhesion of condensation that occurs.

[0011] This invention has been made in view of the above problems, and aims to provide a peripheral structure for a mullion supporting a curtain wall, which enhances the aesthetic appeal by surrounding the protruding area of ​​the mullion supporting the curtain wall that protrudes inward with a wooden cover, while suppressing decay of the wooden cover caused by condensation that may occur. [Means for solving the problem]

[0012] To achieve the above objective, one embodiment of the peripheral structure for a mullion supporting a curtain wall according to the present invention is: A peripheral structure for a mullion that supports a curtain wall, which constitutes the periphery of a protruding area that extends inward from the interior of a metal mullion to which a curtain wall is attached, The outer surface of the protruding area is surrounded by a wooden cover. The interface between the outer circumferential surface of the protruding region and the inner circumferential surface of the wooden cover is characterized in that multiple recesses and multiple protrusions extending in the longitudinal direction of the mullion are alternately arranged, and the recesses face the outer circumferential surface of the protruding region.

[0013] According to this embodiment, multiple recesses and multiple protrusions extending in the longitudinal direction of the mullion are alternately arranged throughout the entire interface between the outer surface of the protruding area on the indoor side of the mullion and the inner surface of the wooden cover surrounding the protruding area, and the recesses face the outer surface of the protruding area. As a result, condensation generated in the protruding area can be discharged through the recesses, thereby suppressing decay of the wooden cover caused by condensation.

[0014] Furthermore, another aspect of the peripheral structure for the mullions supporting the curtain wall according to the present invention is: A peripheral structure for a mullion that supports a curtain wall, which constitutes the periphery of a protruding area that extends inward from the interior of a metal mullion to which a curtain wall is attached, The outer surface of the protruding area is surrounded by a wooden cover. A gap is provided across the entire area between the outer circumferential surface of the protruding region and the inner circumferential surface of the wooden cover.

[0015] According to this embodiment, a gap is provided throughout the entire area between the outer circumferential surface of the protruding region on the indoor side of the mullion and the inner circumferential surface of the wooden cover surrounding the protruding region. This allows condensation generated in the protruding region to be discharged through the gap, thereby suppressing decay of the wooden cover caused by condensation.

[0016] Furthermore, another aspect of the peripheral structure for the mullions supporting the curtain wall according to the present invention is: The outer surface of the protruding region is characterized by having a plurality of recesses and a plurality of protrusions.

[0017] According to this embodiment, by providing a plurality of recesses and a plurality of protrusions on the outer circumferential surface of the protruding region, a plurality of recesses that allow condensation to flow between the protruding region and the wooden cover can be formed with the simplest possible configuration.

[0018] Furthermore, another aspect of the peripheral structure for the mullions supporting the curtain wall according to the present invention is: The wooden cover is characterized by having multiple recesses and multiple protrusions on its inner surface.

[0019] According to this embodiment, by providing multiple recesses and multiple protrusions on the inner surface of the wooden cover, multiple recesses that allow condensation to flow between the protruding area and the wooden cover can be formed with the simplest possible configuration.

[0020] Furthermore, another aspect of the peripheral structure for the mullions supporting the curtain wall according to the present invention is: An intervening material having multiple recesses and multiple protrusions is interposed between the protruding region and the wooden cover.

[0021] According to this aspect, an interposed material having a plurality of concave portions and a plurality of convex portions is interposed between the protruding area and the wooden cover, thereby preventing the dew condensation generated in the protruding area from contacting the wooden cover and discharging the generated dew condensation through the concave portions.

[0022] Moreover, another aspect of the peripheral structure of the upright that supports the curtain wall according to the present invention is There is a dew condensation receiver below the protruding area, and a discharge opening for discharging dew condensation to the outside communicates with the dew condensation receiver.

[0023] According to this aspect, since the discharge opening for discharging dew condensation to the outside communicates with the dew condensation receiver below the protruding area, the dew condensation flowing downward through the concave portions and gaps can be quickly discharged to the outside.

[0024] Moreover, another aspect of the peripheral structure of the upright that supports the curtain wall according to the present invention is A wooden louver is attached to the outdoor side of the upright, The wooden louver is characterized by having at least a louver body with a curved surface on the outdoor side.

[0025] According to this aspect, since a wooden louver is attached to the outdoor side of the upright, excellent exterior design quality emitted by the wood can be imparted to a building in the form of a curtain wall. Furthermore, since the louver body has a curved surface on the outdoor side, the wind cut noise can be effectively suppressed. For example, in the case of a louver having a general plate shape, the wind cut noise (wind noise) when the wind blows through the side of the louver becomes a problem, and this problem becomes more prominent in the case of high-rise buildings. However, since the louver body has a curved surface on the outdoor side, this problem is solved.

[0026] Specific examples of shapes where "the louver body has a curved surface on the outdoor side" include cylindrical shapes, shapes with grooves extending in the longitudinal direction of the louver body on a cylindrical surface, and shapes where the cross-sectional shape perpendicular to the longitudinal direction of the louver body is horseshoe-shaped or roughly horseshoe-shaped. [Effects of the Invention]

[0027] As can be understood from the above explanation, the peripheral structure of the mullion supporting the curtain wall according to the present invention enhances the aesthetic appeal by surrounding the protruding area of ​​the mullion supporting the curtain wall with a wooden cover, thereby suppressing decay of the wooden cover caused by condensation that may occur. [Brief explanation of the drawing]

[0028] [Figure 1] This is a front view of a part of a curtain wall type building, which includes an example of a peripheral structure for mullions supporting the curtain wall according to the embodiment. [Figure 2] This is a view along the line II-II in Figure 1, and is a cross-sectional view obtained by cutting an example of the peripheral structure of a mullion supporting a curtain wall according to the embodiment, with a cross section perpendicular to the longitudinal direction of the mullion. [Figure 3] This is a view taken along the line III-III in Figure 2, which is a longitudinal cross-section cut at the midpoint between the mullion and the louver. [Figure 4] This is a front view of part of another example of a curtain wall type building, which includes an example of a peripheral structure for mullions supporting a curtain wall according to the embodiment. [Figure 5] This is a cross-section of another example of the peripheral structure of a mullion supporting a curtain wall according to the embodiment, cut in a section perpendicular to the longitudinal direction of the mullion. [Figure 6] This is a cross-section of yet another example of the peripheral structure of a mullion supporting a curtain wall according to the embodiment, cut in a section perpendicular to the longitudinal direction of the mullion. [Figure 7] This is a cross-section of yet another example of the peripheral structure of a mullion supporting a curtain wall according to the embodiment, cut in a section perpendicular to the longitudinal direction of the mullion. [Modes for carrying out the invention]

[0029] Hereinafter, an example of the peripheral structure of the mullion supporting the curtain wall according to the embodiment will be described with reference to the attached drawings. In this specification and drawings, substantially identical components may be denoted by the same reference numerals to avoid redundant explanations.

[0030] [Peripheral structure of the mullions supporting the curtain wall according to the embodiment] Referring to Figures 1 to 7, an example of the peripheral structure of a mullion supporting a curtain wall according to the embodiment will be described. Here, Figure 1 is a front view of a part of a curtain wall building equipped with an example of the peripheral structure of a mullion supporting a curtain wall according to the embodiment, Figure 2 is a view taken along the line II-II in Figure 1, and is a cross-sectional view of an example of the peripheral structure of a mullion supporting a curtain wall according to the embodiment, cut in a section perpendicular to the longitudinal direction of the mullion, and Figure 3 is a view taken along the line III-III in Figure 2, and is a longitudinal cross-sectional view cut at the center position of the mullion and louvers. Furthermore, Figure 4 is a front view of a part of another example of a curtain wall building equipped with an example of the peripheral structure of a mullion supporting a curtain wall according to the embodiment, and Figures 5 to 7 are all cross-sectional views of other examples of the peripheral structure of a mullion supporting a curtain wall according to the embodiment, cut in a section perpendicular to the longitudinal direction of the mullion.

[0031] The building shown in Figure 1 is a multi-story building, and Figure 1 is a front view showing a portion of the first floor and part of the second floor.

[0032] A reinforced concrete foundation 10A (for example, a strip foundation) and a reinforced concrete inter-story beam 10B between the first and second floors extend horizontally. Multiple curtain walls 20 are installed between the foundation 10A and the inter-story beam 10B to form an exterior wall, and a similar exterior wall is formed on the second floor above the inter-story beam 10B.

[0033] Multiple vertically extending metal mullions 30 are erected at intervals in the horizontal direction, with the upper and lower ends of each mullion 30 connected to the inter-floor beam 10B and the foundation 10A. The left and right ends of the curtain walls 20 are fitted between the horizontally aligned mullions 30, thereby forming an exterior wall consisting of multiple curtain walls 20.

[0034] The metal mullions 30 are made of steel, aluminum, stainless steel, or the like.

[0035] In the example shown in Figure 2, the curtain wall 20 consists of double-glazed glass with two panes of glass 22 and an air gap 24 between them. A sealing material 28 is fitted to the ends of the two panes of glass 22, and the thickness of the sealing material 28 maintains an air gap 24 of a certain thickness.

[0036] The mullion 30 has a glass holding portion 31 that accommodates and supports the end of the curtain wall 20, and a protruding region 33 that is continuous with the glass holding portion 31 and protrudes inward.

[0037] The glass holding portion 31 has an H-shaped cross-section perpendicular to its longitudinal direction, and the ends of the curtain wall 20 are accommodated in the left and right recesses 31a. By fitting a packing 26 between the two glass panes 22 and the glass holding portion 31, the ends of the curtain wall 20 are sealed to the glass holding portion 31 and installed.

[0038] Here, the illustrated example shows a configuration in which the mullion 30 has both a glass holding portion 31 that holds the end of the curtain wall 20 and a protruding region 33 that projects inward. However, there are various configurations for the mullion's form, the curtain wall's form, and the mounting structure between the mullion and the curtain wall, such as a configuration in which the mullion has only a protruding region, and a mullion (not shown) is provided at the end of the curtain wall, with the mullion being fastened to the protruding region of the mullion via fasteners.

[0039] The protruding region 33 is formed, for example, by hollow extrusion molding of aluminum, and has a rectangular cross-sectional shape perpendicular to the longitudinal direction, with a hollow 37. Here, the outer diameter of the protruding region 33 may be a circle, an ellipse, or a polygon other than a rectangle (such as a triangle), in addition to the rectangle shown in the illustrated example.

[0040] The mullion 30 may be formed by manufacturing the protruding region 33 and the glass holding portion 31 separately and joining them by welding or bolting, or the entire protruding region 33 and the glass holding portion 31 may be molded as a single unit.

[0041] The mullion 30 is provided with a protruding region 33 that extends inward, thereby increasing the rigidity of the mullion 30 and enabling it to stably support the curtain wall 20 against external forces such as wind acting on it.

[0042] On the other hand, the metal protruding area 33 that extends inward into the room can detract from the aesthetic appeal (interior design) of the interior. To address this issue, the protruding area 33 of the mullion 30 is surrounded by a wooden cover 50.

[0043] The protruding area 33 is enclosed (concealed) by the wooden cover 50, which creates a soft and warm atmosphere through the interior design of the wooden outer surface 51, thus eliminating the sense of incongruity caused by the metal protruding area 33 protruding into the interior.

[0044] Incidentally, in winter when the outside air is cold, when the glass holding portion 31 on the outdoor side of the metal mullion 30 is cooled by the outside air, the protruding portion 33 that extends inward is also cooled, leading to condensation. And it is extremely difficult to completely prevent such condensation from occurring.

[0045] In the illustrated example, since the outer surface 35 of the protruding region 33 is surrounded by a wooden cover 50, condensation that occurs may adhere to the wooden cover 50, and if this condition persists, the wooden cover 50 may rot prematurely.

[0046] Therefore, an intervening material 60 is provided, which alternately has a plurality of recesses 64 and a plurality of protrusions 62 extending in the longitudinal direction of the mullion 30, over the entire interface between the outer circumferential surface 35 of the protruding region 33 and the inner circumferential surface 52 of the wooden cover 50, and is arranged so that each recess 64 faces the outer circumferential surface 35 of the protruding region 33.

[0047] Here, the intervening material 60 is formed from an elastic resin material such as rubber, or a hard resin material, etc.

[0048] Condensation that forms on the outer circumferential surface 35 of the protruding region 33 flows downward in the Y1 direction through each recess 64, as shown in Figure 3, and condensation that forms on the inner circumferential surface 36 facing the hollow 37 flows downward in the Y2 direction through the inner circumferential surface 36.

[0049] A condensation tray 70 is installed above the foundation 10A, in a position below the protruding area 33, and a discharge opening 80 is connected to the condensation tray 70.

[0050] Condensation that flows downward through the recess 64 and inner circumferential surface 36 of the protruding region 33 flows down in the Y3 and Y4 directions toward the condensation receiver 70, and is discharged to the outside in the Y5 direction through the condensation receiver 70 and the discharge opening 80.

[0051] Thus, a peripheral structure 100 is formed for the mullion supporting the curtain wall, in which a protruding region 33 projecting inward toward the interior of the building is provided on the outer surface 35 of the metal mullion 30 to which the curtain wall 20 is attached, and a mechanism is provided at the interface between the protruding region 33 and the inner surface 52 of the wooden cover 50 for draining condensation.

[0052] As shown in the illustrated example, the outer surface 35 of the protruding region 33 of the mullion 30 is surrounded by the wooden cover 50, which allows for the formation of a wood-based interior design while quickly discharging condensation that is likely to occur in the metal protruding region 33 to the outside. The condensation adheres to the wooden cover 50, and this condition is maintained, which suppresses the premature decay of the wooden cover 50.

[0053] Furthermore, as shown in Figures 1 to 3, a wooden louver 40 is attached to the outdoor side of the metal mullion 30.

[0054] The wooden louver 40 has a cylindrical louver body 41 and a plurality of engaging pieces 47 that are fastened to the back surface 45 of the louver body 41 at intervals along the longitudinal direction of the louver body 41 with fasteners 48 such as screws.

[0055] As shown in Figure 3, the outer surface of the glass holding portion 31 of the mullion 30 has engaging pieces 38 attached to it at intervals along its longitudinal direction using fasteners 39 such as screws, and the multiple engaging pieces 47 of the wooden louver 40 are attached to the back surface 45 of the louver body 41 at positions corresponding to each engaging piece 38.

[0056] As shown in Figure 2, the cross-sectional dimensions of the louver body 41 are such that they completely conceal the glass holding portion 31 located on the outdoor side of the mullion 30. For example, the diameter B2 of the louver body 41 in a cross section perpendicular to the longitudinal direction is set to be larger than the maximum width B1 of the mullion 30. This setting ensures that the mullion 30 is completely concealed by the louver 40 when viewed from the outdoor side.

[0057] Furthermore, since the louver body 41 is cylindrical, its entire circumference is a curved surface 43.

[0058] The wooden louver body 41 is made of, for example, cedar or cypress.

[0059] Preferably, the louver body 41 is impregnated with a wood preservative. Such impregnation treatment effectively suppresses the deterioration of the wooden louver body 41 caused by ultraviolet rays, decay fungi, etc.

[0060] In this case, wood preservatives that meet AQ certification (Approved Quality, a certification for superior wood building materials conducted by the Japan Housing and Wood Technology Center) can be applied.

[0061] As shown in Figure 2, the wooden louvers 40 are erected on the outdoor side of the mullion 30, which effectively blocks sunlight incident in the upward diagonal direction, X1.

[0062] Furthermore, the application of the wooden louvers 40 allows for the addition of the excellent aesthetic design qualities inherent in wood to curtain wall-type buildings, and because it is a natural material, it can reduce carbon dioxide emissions and enhance the reduction of environmental impact.

[0063] Furthermore, because the entire circumference of the louver body 41 is curved, the wind that touches the louver body 41 can flow smoothly along the curved surface 43, effectively suppressing wind noise. For example, conventional louvers are plate-shaped, and therefore wind noise tends to be loud when wind blows past the side of the louver, which is a factor in wind noise. However, by applying a louver body 41 with a shape like the one shown in the illustration, wind noise can be suppressed.

[0064] Furthermore, the wooden louver 40 has multiple engaging pieces 47 attached to the back surface 45 of the louver body 41, and each engaging piece 47 engages with multiple engaging pieces 38 attached to the mullion 30, thereby enabling good attachment of the wooden louver 40 to the mullion 30.

[0065] Here, a curtain wall type building equipped with a mullion peripheral structure 100 supporting the curtain wall according to the embodiment may be a form in which a transom 30B extending horizontally is attached to the connection area of ​​the mullions 30 of the upper and lower floors, and the curtain wall is divided vertically by the horizontal transom 30B, as shown in Figure 4. In this form, the mullions may be continuous vertically rather than being divided vertically in the attachment area of ​​the transom 30B, as shown in the illustrated example.

[0066] Other forms of the surrounding structure for the mullions supporting the curtain wall are shown in Figures 5 to 7.

[0067] The mullion periphery structure 100A shown in Figure 5 differs from the mullion periphery structure 100 in that the protruding region 33A of the mullion 30A has a plurality of recesses 35b and a plurality of protrusions 35a on its outer surface 35, and each protrusion 35a abuts against the inner surface 52 of the wooden cover 50.

[0068] According to the surrounding structure 100A of the mullion, the intervening material 60 is unnecessary, and multiple recesses 35b for draining condensation can be formed between the protruding region 33A and the wooden cover 50 with the simplest possible configuration.

[0069] On the other hand, the mullion peripheral structure 100B shown in Figure 6 differs from the mullion peripheral structure 100 in that the inner circumferential surface 52 of the wooden cover 50A is provided with a plurality of recesses 52b and a plurality of protrusions 52a, and each protrusion 52a abuts against the outer circumferential surface 35 of the protruding region 33.

[0070] The surrounding structure 100B of the mullion also eliminates the need for interfacing material 60, and allows for the formation of multiple recesses 52b between the protruding region 33 and the wooden cover 50A for draining condensation, in the simplest possible configuration.

[0071] On the other hand, the mullion periphery structure 100C shown in Figure 7 differs from the mullion periphery structure 100 in that a gap 58 is provided throughout the entire area between the outer surface 35 of the protruding region 33 of the mullion 30 and the inner surface 52 of the wooden cover 50.

[0072] According to the mullion's peripheral structure 100C, the intervening material 60 is unnecessary, and processing of recesses and protrusions on the protruding region 33 and the wooden cover 50 is unnecessary, while the gap 58 that is present throughout the entire area between the protruding region 33 and the wooden cover 50 can form a wide-area flow path for condensation.

[0073] Here, although not shown in the illustration, a gap 58 may be provided throughout the entire area between the protruding region 33 and the wooden cover 50, and either one or both of the protruding region 33 and the wooden cover 50 may have a recess and a protrusion, or an intervening material 60 may be arranged so as to abut one of the protruding region 33 and the wooden cover 50, with a gap 58 provided between the other of the protruding region 33 and the wooden cover 50 and the intervening material 60.

[0074] Other embodiments may be used in which other components are combined with the configurations listed in the above embodiments, and the present invention is not limited in any way to the configurations shown herein. In this regard, modifications can be made without departing from the spirit of the present invention, and can be appropriately determined according to the application form. [Explanation of symbols]

[0075] 10A: Basics 10B: Interstory beam 20: Curtain Wall 22: Glass 24: Air layer 26: Packing 28: Sealing material 30,30A: mullion 30B: No eyes 31: Glass holding part 31a: Recess 33,33A: Projection area 35: Outer surface 35a: Convex part 35b: Recess 36: Inner surface 37:Hollow 38: Engaged piece 39: Fasteners 40: Wooden louvers 41: Louver body 43: Curved surface 45: Back 47: Engaging piece 48: Fasteners 50, 50A: Wooden cover 51: Outer surface 52: Inner surface 52a: Convex part 52b: Recess 58: Gap 60: Assistive devices 62: Convex part 64: Recess 70: Condensation tray 80: Discharge opening 100, 100A, 100B, 100C: Peripheral structure of mullions supporting a curtain wall (peripheral structure of mullions)

Claims

1. A peripheral structure for a mullion that supports a curtain wall, which constitutes the periphery of a protruding area that extends inward from the interior of a metal mullion to which a curtain wall is attached, The outer surface of the protruding area is surrounded by a wooden cover. A peripheral structure for a mullion supporting a curtain wall, characterized in that, throughout the entire interface between the outer surface of the protruding region and the inner surface of the wooden cover, a plurality of recesses and a plurality of protrusions extending in the longitudinal direction of the mullion are alternately arranged, and the recesses face the outer surface of the protruding region.

2. A peripheral structure for a mullion that supports a curtain wall, which constitutes the periphery of a protruding area that extends inward from the interior of a metal mullion to which a curtain wall is attached, The outer surface of the protruding area is surrounded by a wooden cover. A peripheral structure for a mullion supporting a curtain wall, characterized in that a gap is provided over the entire area between the outer circumferential surface of the protruding region and the inner circumferential surface of the wooden cover.

3. The peripheral structure for a mullion supporting a curtain wall according to claim 1 or 2, characterized in that a plurality of recesses and a plurality of protrusions are provided on the outer circumferential surface of the protruding region.

4. The peripheral structure for a mullion supporting a curtain wall according to claim 1 or 2, characterized in that a plurality of recesses and a plurality of protrusions are provided on the inner circumferential surface of the wooden cover.

5. A peripheral structure for a mullion supporting a curtain wall according to claim 1 or 2, characterized in that an intervening material having a plurality of recesses and a plurality of protrusions is interposed between the protruding region and the wooden cover.

6. A peripheral structure for a mullion supporting a curtain wall according to claim 1 or 2, characterized in that there is a condensation tray below the protruding region, and a discharge opening for discharging condensation to the outside is in communication with the condensation tray.

7. A wooden louver is attached to the outdoor side of the aforementioned mullion. The surrounding structure for a mullion supporting a curtain wall according to claim 1 or 2, characterized in that the wooden louver has a louver body having at least a curved surface on the outdoor side.

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