JP2007100435A - Structure of outer wall corner part by metal curtain wall - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide structure of an outer wall corner part by a metal curtain wall having good design, capable of securing airtightness and watertightness of the outer wall corner part even in strong wind such as a typhoon, and capable of preventing abnormal noise from occurring due to interlayer displacement in normal wind and earthquake. <P>SOLUTION: This structure of the outer wall corner part is formed of the flat unit U of a metal curtain wall. The vertical frame 1 of the flat unit on the outer wall corner part side is formed in a cross sectional shape along the bisector of the angle of the outer wall corner part in plan view. A vertical joint a along the bisector is formed by abutting these vertical frames on each other. A vertical joint opening stop mechanism A having engagement acting parts 3a, 3b engageable with each other and in which a clearance b is formed between the engagement acting parts is installed between the vertical frames. When a wind pressure exceeding a set pressure acts on the flat unit of the outer wall corner part and the flat unit is deflected by a predetermined amount to the outside of the surface, the engagement acting parts of the vertical joint opening stop mechanism are engaged with each other to stop the opening of the vertical joints. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a structure of an outer wall corner portion (protruding corner portion or entering corner portion) constituted by a flat unit of a metal curtain wall such as an aluminum curtain wall composed of a rectangular frame and a window glass fitted therein.

  As shown in FIG. 5, the outer wall corner portion of the metal curtain wall such as an aluminum curtain wall is made of an L-shaped unit LU made in a cross-sectional shape bent into an L shape corresponding to the angle of the protruding corner, for example. As shown in FIG. 6 and FIG. 7, a corner portion (protruding corner portion) and an outer wall corner portion (protruding corner portion and entering corner portion) are known as a flat unit U of a metal curtain wall. ing.

  The former uses an L-shaped unit for the outer wall corner portion, so the outer wall corner portion is compact. However, the L-shaped unit LU is three-dimensional (bulky) and has a lower rigidity than the flat unit U. Therefore, not only transportation to the building site but also storage and small transportation at the building site, installation work on the building frame, etc., and the cross-sectional shape of the L-shaped unit LU is complicated, It is also disadvantageous in terms of manufacturing, and there are significant problems in terms of workability and cost.

  In this respect, according to the latter, since the flat unit U similar to the outer wall general part (planar part) is used also in the outer wall corner part, it is more advantageous in terms of workability and cost than using the L-shaped unit LU. is there.

  However, as shown in FIGS. 6 and 7, the conventional outer wall corner portion by the flat unit U has flat units U, U arranged at right angles to each other and between the vertical frames 1, 1 of the adjacent flat units U, U. It has been configured by providing the protruding corner member 60 and the entering corner member 70. G in the figure is a window glass.

  Therefore, in any outer wall corner portion, there is a large volume frame member (protruding corner member 60 or entering corner member 70) between the adjacent flat units U, U. As a result, in the protruding corner portion, the frame material (protruding corner member 60) appearing on the outdoor side widens the finding of the vertical joints, which impairs the design of the outer wall surface. At the entrance corner, a large volume frame member (entrance corner member 70) appears on the indoor side, which not only impairs the interior design but also hinders daylighting and viewing.

  As a solution to such a problem, of the left and right vertical frames constituting the rectangular frame of the flat unit, one of the vertical frames (the vertical frame on the outer wall corner portion side) has an angle of the outer wall corner portion in plan view. It is conceivable to form a cross-sectional shape along a bisector, and to form a narrow joint with a narrow find along the bisector of the angle of the outer wall corner by abutting the vertical frame of this cross-sectional shape.

  However, metal curtain walls such as aluminum curtain walls are much less rigid than precast concrete curtain walls, so we devised the cross-sectional shape of the vertical frame in the rectangular frame of the metal curtain wall, Even if vertical joints are formed along the angle bisector of the outer wall corner, a large wind pressure (positive or negative pressure) acts on the flat unit at the outer wall corner due to strong winds such as typhoons. It is considered that there is a high possibility that the vertical joint opens and the airtight performance and watertight performance of the outer wall corner portion cannot be secured when the sag is bent in the out-of-plane direction.

  That is, since the flat unit of the metal curtain wall is usually attached to the building frame at the upper and lower floor slab positions, the vertical frame on the outer wall corner side of the flat unit is the outer wall corner portion in plan view. When forming a vertical joint along the bisector of the angle of the outer wall corner by forming a cross-sectional shape along the bisector of the angle of During strong winds, it is assumed that the center of the floor height of the flat unit located on both sides of the vertical joint bends to the outdoor side due to the negative pressure acting on the flat joint, and the vertical deflection occurs in this out-of-plane direction (outside). The joints will be greatly expanded.

  In addition, at the corner of entry, it is assumed that the center of the floor height of the flat unit located on both sides of the vertical joint bends indoors due to the positive pressure acting on the flat unit during strong wind. The vertical joint spreads greatly due to the bending toward the indoor side), and in either case, the airtight performance and the watertight performance cannot be ensured.

  Therefore, the new problem derived from the above-described solution can be solved by adding an appropriate vertical joint opening prevention mechanism that can prevent the spread of the vertical joint due to the deflection of the flat unit in the out-of-plane direction. It is considered that the airtight performance and watertight performance of the part can be secured.

  In addition, although patent document 1 does not have description about an outer wall corner part, a gondola guide part is formed in the vertical joint between the vertical frames of the curtain wall unit adjacent to right and left, and the vertical frame located in the both sides of a gondola guide part A unit type curtain wall is described in which the two are connected by a connecting member composed of a first connecting member and a second connecting member that are engaged with each other so as not to move in the in-plane direction. This connecting member is intended to disperse the impact force when the gondola swings left and right due to strong winds and earthquakes and collides with one vertical frame forming the gondola guide part, to the other vertical frame, The first connecting member attached to one vertical frame and the second connecting member attached to the other vertical frame are engaged with each other so as not to move in the in-plane direction. Therefore, the connecting member also functions as a vertical joint opening stopper. For example, when the curtain wall unit adjacent to the left and right is swung in the in-plane direction due to an interlayer displacement during an earthquake, the first connecting member and the second connecting member are connected. Abnormal noises such as stagnation due to sliding contact of members occur.

  In addition, Patent Document 2 does not describe the outer wall corner portion, but describes a panel joint fitting for a curtain wall that prevents the movement of the panels in the out-of-plane direction and allows the movement in the in-plane direction. FIG. 7 shows a panel joining metal fitting in which the locking piece of the female fitting and the locking piece of the male fitting are engaged to prevent further movement in the in-plane direction. Yes. The panel joint metal fitting of FIG. 7 functions as an anti-opening of the vertical joint because it prevents further movement of the panels in a state where the locking pieces located on both sides of the vertical joint are engaged with each other. Since the front end of each locking piece is in contact with both metal pieces, it is the same as the technique described in Patent Document 1 in that abnormal noise such as stagnation due to sliding contact may occur.

Japanese Patent No. 3661139 Japanese Utility Model Publication No. 62-8253

  The present invention has been made in consideration of the above points, and the object of the present invention is excellent in design, and can ensure the airtight performance and watertight performance of the outer wall corner portion even in strong winds such as typhoons. Another object of the present invention is to provide a structure of a corner portion of an outer wall made of a metal curtain wall that can prevent generation of abnormal noise due to normal wind or an interlayer displacement during an earthquake.

  The technical means taken by the present invention in order to achieve the above object are as follows. In other words, the invention according to claim 1 is a structure of an outer wall corner portion constituted by a flat unit of a metal curtain wall, and the vertical frame on the outer wall corner portion side of the flat unit has two angles of the outer wall corner portion in plan view. Forming a cross-sectional shape along the bisector, and forming a vertical joint along the bisector of the angle of the outer wall corner portion between the vertical frames formed by abutting these vertical frames in plan view, Between the vertical frames, there is a vertical joint opening prevention mechanism that has engaging action parts that can be engaged with each other and that has a clearance between the engaging action parts, and wind pressure higher than the setting acts on the flat unit at the corner of the outer wall. Then, when the flat unit bends by a predetermined amount in the out-of-plane direction, the engaging action portions of the vertical joint opening preventing mechanism are engaged with each other to prevent the vertical joint from opening. Yes.

  The invention according to claim 2 is characterized in that a buffer rubber is attached to the engaging portion of the vertical joint opening preventing mechanism.

  According to the first aspect of the present invention, the vertical frame on the outer wall corner portion side of the flat unit is formed in a cross-sectional shape along the bisector of the angle of the outer wall corner portion in plan view, and Since the vertical joints are formed along the bisector of the angle of the corners of the outer wall by the butting, there is no large volume frame material at the corners of the outer walls, the finding of the vertical joints is narrow, and the outer wall surface is excellent in design Can be formed.

  In addition, even if a large wind pressure (positive or negative pressure) acts on the flat unit at the corner of the outer wall during strong winds such as typhoons, the flat unit bends by a predetermined amount in the out-of-plane direction. Since the joint portions engage with each other to prevent the vertical joint from opening, it is possible to ensure the airtight performance and watertight performance of the outer wall corner portion.

  Nevertheless, since the clearance is formed between the engaging action portions of the vertical joint opening prevention mechanism, in other words, since the engaging action portions are not in contact with each other, the normal unit is caused to move out of the plane by the normal wind. Even if the flat unit is deformed due to deflection or displacement between layers during an earthquake, the engaging action parts do not rub against each other within the clearance range. The generation of sound can be prevented.

  In addition, since a clearance is formed between the engaging portions of the vertical joint stop mechanism, the flat unit is easier to construct than when the flat unit is suspended at a predetermined position without any clearance. In particular, according to the invention described in claim 2, since the cushioning rubber is attached to the engaging action portion of the vertical joint opening preventing mechanism, there is some construction error in the mounting position of the flat unit with respect to the building frame. Even if there exists, there is no possibility that the engaging action parts will contact, and construction is easy.

  Hereinafter, the structure of the outer wall corner portion (protruding corner portion and entering corner portion) of the metal curtain wall according to the present invention will be described with reference to the drawings. FIG. 1 shows an example of the structure of a protruding corner according to the present invention. The protruding corner is a flat unit U of an aluminum curtain wall (an example of a metal curtain wall) composed of a rectangular frame composed of left and right vertical frames 1 and upper and lower horizontal frames 2 and a window glass G fitted therein. It consists of

Specifically, of the left and right vertical frames 1 constituting the rectangular frame of the flat unit U, one vertical frame 1, that is, the vertical frame 1 arranged on the protruding corner side is the protruding corner portion in plan view. A vertical joint a is formed along the bisector P at the angle of the protruding corner by abutment of these vertical frames 1 and 1. . In the illustrated example, the angle of the protruding corner is 90 degrees, so the vertical frame on the protruding corner is formed in a cross-sectional shape inclined at an angle of 45 degrees, but the angle of the protruding corner is a right angle. Therefore, if the angle of the protruding corner changes, the cross-sectional shape of the vertical frames 1 and 1 will be changed accordingly.

Further, between the vertical frames 1 and 1, there is provided a vertical joint opening prevention mechanism A having engaging action portions 3a and 3b that can be engaged with each other and forming a clearance b between the engaging action portions 3a and 3b. Wind pressure (negative pressure) higher than the setting acts on the flat units U, U at the protruding corners, so that the center of the floor height of the flat units U, U is in the out-of-plane direction (arrows X ₁ , Y ₁ direction). By engaging the fixed amount, the engaging portions 3a and 3b of the vertical joint opening preventing mechanism A are engaged with each other to prevent the vertical joint a from opening.

Reference numerals 4a, 4b, 5a, 5b, 6a and 6b are fixed seals made of silicon foam, synthetic rubber or the like, which are fitted in and attached to vertical grooves formed in the vertical frames 1 and 1 on both sides of the vertical joint a. A rain barrier is formed by elastically adhering the outer fixed sealing materials 4a and 4b, 5a and 5b to each other, and a window by elastically adhering the inner fixed sealing materials (gaskets) 6a and 6b to each other. A barrier is configured, and the two-stage seal composed of the rain barrier and the wind barrier is configured to ensure the airtight performance and the watertight performance of the outer wall corner portion. In the example shown in the figure, the rain barrier is composed of a fixed sealing material made of silicon foam or synthetic rubber, but the rain barrier can also be implemented as a wet seal with an irregular sealing material. is there.

  The illustrated vertical joint opening prevention mechanism A has engagement action portions 3a and 3b provided at the center in the depth direction of the vertical joint a and engagement action portions 3a and 3b provided near the outer end of the vertical joint a. is doing. Engagement action portions 3a and 3b provided at the center in the depth direction of the vertical joint a are provided with a first member 7 provided on one vertical frame 1 of the left and right vertical frames 1 and 1 located on both sides of the vertical joint a. The second member 8 is provided on the other vertical frame 1. The first member 7 includes a substrate portion 7a, a bent plate portion 7b that is continuously bent at a right angle from the substrate portion 7a, and a locking piece 7c that is bent outward from the tip of the bent plate portion 7b. The buffer rubber 9 is fitted to the locking piece 7c. The second member 8 includes a substrate portion 8a, a bent plate portion 8b that is continuously bent at a right angle from the substrate portion 8a, and a locking piece 8c that is bent outward from the tip of the bent plate portion 8b. A buffer rubber 9 is fitted to the locking piece 8c. Then, the clearance b is formed around both the buffer rubbers 9 and 9.

  One engagement action part 3a of the engagement action parts 3a, 3b provided in the vicinity of the outer end of the vertical joint a is formed by the outer end bent part of one vertical frame 1 itself, and the other engagement action. The part 3 b is constituted by 10 on the engaging member provided on the other vertical frame 1. The engaging member 10 includes a substrate portion 10a, a bent plate portion 10b that is continuously bent at a right angle from the substrate portion 10a, and a locking piece 10c that is bent in the outdoor direction from the tip of the bent plate portion 10b. The engaging piece 10c is configured to engage with an outer end bent portion (one engaging action portion 3a) of one vertical frame 1 itself. Further, a buffer rubber 9 is fitted to the locking piece 10c, and the clearance b is formed around the buffer rubber 9.

  The first member 7, the second member 8, and the engaging member 10 are all provided one by one at the longitudinal center of the vertical frame 1, 1 or a plurality of them with a space in the vertical direction. Desirable for ease of construction. This is because when these members are provided over the entire length in the longitudinal direction of the vertical frame 1, when the next flat unit is suspended adjacent to the flat unit previously attached to the building frame, Although it is necessary to vertically descend while engaging the members by the vertical length, the members 7, 8, 10 are locally provided only in a part of the longitudinal direction of the vertical frames 1, 1. Then, when the next flat unit is suspended adjacent to the flat unit attached to the building frame in advance, the members can be engaged with each other while the flat unit is lowered to an appropriate height. This is because, in this state, the flat unit has only to be lowered vertically by a small distance.

  Further, in providing the first member 7, the second member 8, and the engaging member 10 in a part of the longitudinal direction of the longitudinal frames 1, 1, in the illustrated embodiment, these members 7, 8, 10 are represented by the longitudinal frame. 1 is manufactured separately and is configured to screw the substrate portion to the vertical frame 1, but the first member 7, by cutting off an unnecessary portion of the extrusion molding material integral with the vertical frame 1, It is also possible to produce the second member 8 and the engaging member 10.

  According to the above configuration, the vertical frames 1 and 1 on the protruding corner side of the flat units U and U are formed in a cross-sectional shape along the bisector P of the angle of the protruding corner portion in plan view, and these Since the vertical joint a along the bisector P of the angle of the protruding corner is formed by the butting of the vertical frames 1 and 1, the frame material having a large volume (the protruding corner described in FIG. 6) is formed on the outdoor side of the protruding corner. The member 60) is not present, the vertical joint a is narrowly found, and an outer wall surface excellent in design can be formed.

Further, even if a large wind pressure (negative pressure) acts on the flat units U and U at the corners when strong winds such as typhoons, the flat units U and U are out of the plane (arrows X ₁ , expansion by flexing predetermined amount Y ₁ direction), vertical joints open stopping mechanism a of engaging action for portion 3a, and 3b engage with each other, since the opening stop of the longitudinal joint a, the vertical joints a is more It is not possible to secure the airtight performance and watertight performance at the corners.

Nevertheless, since the clearance b is formed between the engaging portions 3a and 3b of the vertical joint opening prevention mechanism A, in other words, the engaging portions 3a and 3b are not always in contact with each other. Even if the flat units U, U are bent in the out-of-plane direction (arrow X ₁ , Y ₁ direction) or the flat units U, U are deformed due to the interlayer displacement at the time of an earthquake, they are engaged within the clearance b. It is possible to prevent the use parts 3a and 3b from rubbing against each other and the generation of noises such as rubbing and stagnation between the engaging action parts 3a and 3b of the vertical joint opening prevention mechanism A.

  Further, since the clearance b is formed between the engaging portions 3a and 3b of the vertical joint opening prevention mechanism A, compared with the case where the flat units U and U are suspended at a predetermined position without any clearance, Installation of the flat units U, U is easy, and the cushioning rubber 9 is attached to the engaging portions 3a, 3b of the vertical joint opening prevention mechanism A, so the mounting position of the flat units U, U with respect to the building frame Even if there is some construction error, there is no possibility that the engaging portions 3a and 3b come into contact with each other, and the construction is easy.

  FIG. 2 shows an embodiment in which the present invention is applied to the structure of a corner. In this embodiment, there is a slight difference in the cross-sectional shape of the vertical frame 1 such as the cross-sectional shape of the attachment portion of the window glass 2 due to being the entrance corner, but the substantial difference is Therefore, the same components are denoted by the same reference numerals, and description thereof is omitted.

  According to this configuration, the vertical frames 1 and 1 on the corner side of the flat units U and U are formed in a cross-sectional shape along the bisector P of the angle of the corner when viewed in a plan view. Since the vertical joint a along the bisector P of the corner angle is formed by the butting of the frame 1, the frame material having a large volume (the corner member described with reference to FIG. 7) is formed on the indoor side of the corner portion. 70) does not exist, the interior design is not impaired, and the lighting and view are not hindered by the large volume frame material. In the illustrated example, since the angle of the corner is 90 degrees, the vertical frames 1 and 1 on the corner side are formed in a cross-sectional shape inclined at an angle of 45 degrees. Since the angle is not limited to a right angle, if the angle of the corner is changed, the cross-sectional shape of the vertical frames 1 and 1 is also changed accordingly.

Even if a large wind pressure (positive pressure) acts on the flat units U, U at the corners during strong winds such as a typhoon, the center level of the flat units U, U is in the out-of-plane direction by an amount corresponding to the clearance b. By bending a predetermined amount in the directions of the arrows X ₂ and Y ₂ , in other words, by bending a predetermined amount toward the indoor side,
Since the engaging portions 3a and 3b of the vertical joint opening preventing mechanism A are engaged with each other to prevent the vertical joint a from being opened, the vertical joint a is not further expanded, and the air tightness performance and water tightness performance of the corners are not increased. Can be secured. Other functions and effects are the same as those of the embodiment of FIG.

  FIG. 3 shows another embodiment in which the present invention is applied to the structure of the protruding corner. In this embodiment, the engaging action portions 3a and 3b provided at the center in the depth direction of the vertical joint a at the protruding corner are arranged so that the flat units U and U positioned on both sides of the vertical joint a are either on the indoor side or on the outdoor side. Even if it bends in the direction, the engaging action portions 3a and 3b are engaged to form a cross-sectional shape that can prevent the vertical joint from opening.

  That is, in the illustrated vertical joint opening prevention mechanism A, the engaging action portions 3a and 3b are provided only at the center in the depth direction of the vertical joint a, and these engaging action portions 3a and 3b are provided on the vertical joint a. It comprises a first member 7 provided in one vertical frame 1 of the left and right vertical frames 1, 1 located on both sides, and a second member 8 provided in the other vertical frame 1. The first member 7 includes a base plate portion 7a, a pair of bent plate portions 7b and 7b that are continuously bent at a right angle from the base plate portion 7a, and of these bent plate portions 7b and 7b, A locking piece 7c bent in the indoor direction from the tip of the bent plate portion 7b and a locking piece 7c bent in the outdoor direction from the tip of the bent plate portion 7b on the outdoor side are provided. Both locking pieces 7c, 7c Buffer rubbers 9, 9 are fitted to each other. The second member 8 is bent in the outdoor direction from the front end of the substrate portion 8a, a pair of bent plate portions 8b, 8b that are bent at right angles from the substrate portion 8a, and the bent plate portion 8b on the indoor side. There are provided a locking piece 8c and a locking piece 8c bent inward from the tip of the bent plate portion 8b on the outdoor side, and buffer rubbers 9, 9 are fitted to both the locking pieces 8c, 8c, A clearance b is formed around the buffer rubbers 9.

  According to this configuration, the engaging units 3a and 3b provided at the center in the depth direction of the vertical joint a are arranged so that the flat units U and U located on both sides of the vertical joint a are in the indoor side or the outdoor side. Even if it bends, the engaging action portions 3a and 3b are engaged to form a cross-sectional shape that can prevent the vertical joint from opening. Therefore, in the example of FIGS. 1 and 2, it is provided near the outer end of the vertical joint a. The engaged engaging portions 3a and 3b that have been provided can be omitted. Other configurations and operational effects are the same as those in the embodiment of FIG. 1, and thus the same components are denoted by the same reference numerals and description thereof is omitted.

  FIG. 4 shows an embodiment in which the present invention is applied to the structure of the entrance corner. In this embodiment, the engaging units 3a and 3b provided at the center in the depth direction of the vertical joint a at the corner of the entrance are provided with flat units U and U positioned on both sides of the vertical joint a, either on the indoor side or on the outdoor side. Even if it bends in the direction, the engaging action portions 3a and 3b are engaged to form a cross-sectional shape that can prevent the vertical joint from opening.

  According to this configuration, the engaging units 3a and 3b provided at the center in the depth direction of the vertical joint a are arranged so that the flat units U and U located on both sides of the vertical joint a are in the indoor side or the outdoor side. Even if it bends, the engaging action portions 3a and 3b are engaged to form a cross-sectional shape that can prevent the vertical joint from opening. Therefore, in the example of FIGS. 1 and 2, it is provided near the outer end of the vertical joint a. The engaged engaging portions 3a and 3b that have been provided can be omitted. Since other configurations and operational effects are the same as those of the embodiment of FIG. 2, the same reference numerals are given to the same structural members, and description thereof is omitted.

The embodiment of the present invention has been described above. However, the present invention is not limited to the illustrated embodiment. For example, the vertical frame arranged on the corner side is an angle of the corner in a plan view. The vertical joints are formed along the bisector of the angle of the corner of the corner by the butting of these vertical frames, and in the vicinity of the outer edge of this vertical joint. A gondola guide portion is configured, and a vertical joint opening prevention mechanism having engagement action portions that can be engaged with each other and forming a clearance between the engagement action portions is provided at the vertical joint portion on the back side of the gondola guide portion. Needless to say, the present invention can be carried out in various modes without departing from the gist of the present invention. In the illustrated embodiment, the vertical joint a is formed along the bisector P of the angle of the outer wall corner portion (protruding corner portion or entering corner portion). For example, the outer wall corner has an angle of 90 degrees. The vertical frame located on both sides of the vertical joint is made to have different inclination angles, such as forming a cross-sectional shape with one vertical frame inclined at an angle of 60 degrees and the other vertical frame at an angle of 30 degrees. Is also possible.

It is a top view which shows an example of the structure of the protrusion corner part which concerns on this invention. It is a top view which shows an example of the structure of the corner part which concerns on this invention. It is a top view which shows an example of the structure of the protrusion corner part which concerns on this invention. It is a top view which shows an example of the structure of the corner part which concerns on this invention. It is a schematic plan view which shows a prior art example. It is a top view which shows a prior art example. It is a top view which shows a prior art example.

Explanation of symbols

A Vertical joint opening prevention mechanism G Window glass P Divided line U Flat unit a Vertical joint b Clearance 1 Vertical frame 2 Horizontal frame 3a, 3b Engagement action part 4a, 4b, 5a, 5b Fixed seal material constituting rain barrier 6a, 6b Fixed seal material (gasket) constituting the wind barrier
7 First member 7a Substrate part 7b Bent plate part 7c Locking piece 8 Second member 8a Substrate part 8b Bent plate part 8c Locking piece 9 Buffer rubber 10 Engaging member

Claims (2)

  It is a structure of an outer wall corner portion constituted by a flat unit of a metal curtain wall, and a vertical frame on the outer wall corner portion side of the flat unit is formed into a cross-sectional shape along a bisector of the angle of the outer wall corner portion in a plan view. In addition, vertical joints are formed along the bisector of the angle of the outer wall corner portion between the vertical frames formed by abutting these vertical frames in plan view, and the vertical frames can be engaged with each other. A vertical joint opening prevention mechanism is provided that has an engagement action part and a clearance is formed between the engagement action parts, and a wind pressure higher than the setting acts on the flat unit at the outer wall corner part, so that the flat unit moves in the out-of-plane direction. The structure of the corner portion of the outer wall by the metal curtain wall is characterized in that the engagement action portions of the vertical joint opening prevention mechanism are engaged with each other by bending a predetermined amount to prevent the vertical joint from opening. .   The structure of the outer wall corner portion by the metal curtain wall according to claim 1, wherein a buffer rubber is attached to the engaging portion of the longitudinal joint opening preventing mechanism member.

Images