Fixing structure of decorative material and construction method of outer wall

Abstract

To realize a fixing structure of a decorative material capable of preventing interference between a panel and a wall side metal fitting during construction.SOLUTION: In a fixing structure of a decorative material, a bracket 22a includes a first upright wall part 47 disposed at a position vertically overlapping transoms 5a and 5b and fixed to the outdoor side surface of a mullion 4 without projecting in the transverse direction from the mullion 4, and a first seat plate part 48 bent from the lower end part of the first upright wall part 47 toward the outdoor side and partially projecting in the transverse direction from the mullion 4. The upper surface of the first seat plate part 48 is arranged below the lower end face of a glass panel 6 or a spandrel panel 7 whose lower side is held by the transoms 5a and 5b, and the lower surface thereof is arranged above the upper end face of the glass panel 6 or the spandrel panel 7 whose upper side is held by the transoms 5a and 5b.SELECTED DRAWING: Figure 8

Description

[Technical Field]

[0001] The present disclosure relates to a fixing structure for decorative materials and a construction method for exterior walls. [Background technology]

[0002] In buildings and other structures, efforts are being made to improve the exterior design by improving the surface properties of the panel materials that make up the walls and by improving the arrangement of the frame materials that make up the walls.

[0003] In recent years, the demands for the exterior design of buildings have become more diverse, and it may not be possible to fully meet the demands for exterior design by simply improving the wall components that make up the walls of the building.

[0004] Therefore, it has been considered to improve the exterior design by attaching decorative materials to wall components of buildings.

[0005] Japanese Patent Application Laid-Open No. 11-310980 discloses a structure for attaching elaborately designed decorative materials to a curtain wall that constitutes the exterior wall of a building. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 11-310980 Summary of the Invention [Problem to be solved by the invention]

[0007] When attaching decorative materials to a curtain wall, in order to improve workability, it is possible to attach wall-side fittings to the mullions and / or crosspieces that make up the curtain wall in advance in the factory to secure the decorative materials to the curtain wall.

[0008] However, if wall-side fittings are attached to the mullions and / or crossbeams in advance in the factory, there is a possibility that the panel will interfere with the wall-side fittings when the panel is erected into the area surrounded on all sides by adjacent mullions on the left and right and adjacent crossbeams on the top and bottom during curtain wall construction.

[0009] In particular, when fastening two adjacent decorative panels to a single wall bracket attached to a mullion, the wall bracket's horizontal dimension must be large to ensure sufficient engagement. This makes it easier for the wall bracket to protrude from the mullion to the left or right, which can easily cause interference between the panel and the wall bracket.

[0010] The present disclosure aims to provide a decorative material fixing structure and an exterior wall construction method that can prevent interference between a panel and a wall-side fitting during construction. [Means for solving the problem]

[0011] A decorative material fixing structure according to one aspect of the present disclosure is a decorative material fixing structure for fixing a decorative material to the outdoor side of a curtain wall having a plurality of mullions, a plurality of mullions, and a plurality of panels, and is provided with wall-side fittings and decorative material-side fittings.

[0012] The wall-side fittings are fixed to each of a pair of the mullions adjacent to each other in the left-right direction.

[0013] The decorative material-side fitting is disposed with its longitudinal direction oriented in the left-right direction and is fixed to the decorative material.

[0014] The wall-side fittings are positioned at a position where they overlap vertically with the transom, and have a vertical wall portion that is fixed to the outdoor side of the upright without protruding left or right from the upright, and a base plate portion that bends from the lower end of the vertical wall portion toward the outdoor side and has a part of it protruding left or right from the upright.

[0015] The upper surface of the seat panel portion is positioned below the lower end surface of the panel whose lower edge is held by the interlock, and the lower surface of the seat panel portion is positioned above the upper end surface of the panel whose upper edge is held by the interlock.

[0016] The decorative material side fitting has its end on one side in the left-right direction fixed to the seat plate portion of the wall side fitting fixed to one of the pair of uprights in the left-right direction, and its end on the other side in the left-right direction fixed to the seat plate portion of the wall side fitting fixed to the other of the pair of uprights in the left-right direction.

[0017] In one aspect of the fixing structure for a decorative material according to the present disclosure, one of the end portions on one side in the left-right direction and the other end portion on the other side in the left-right direction of the decorative material side fittings is fixed so that relative movement in the left-right direction is not possible, and the other of the end portions on one side in the left-right direction and the other end portion on the other side in the left-right direction is fixed so that relative movement in the left-right direction is possible.

[0018] In one aspect of the decorative material fixing structure of the present disclosure, the seat plate portion has a main body portion arranged in a portion overlapping with the upright in the out-of-plane direction, and a protruding portion protruding left and right from the upright, and the decorative material side fitting has an end portion on one left and right side fixed to one of the main body portion and the protruding portion of the wall side fitting fixed to the upright on one left and right side, and an end portion on the other left and right side fixed to the other of the main body portion and the protruding portion of the wall side fitting fixed to the upright on the other left and right side.

[0019] In a decorative material fixing structure according to one embodiment of the present disclosure, the decorative material side fitting has a first fixing hole at one end in the left-right direction and a second fixing hole at the other end in the left-right direction, and the wall side fitting has a third fixing hole in the main body portion and a fourth fixing hole in the protruding portion. Any of the first fixing hole, the second fixing hole, the third fixing hole, and the fourth fixing hole is a loose hole that allows relative left-right movement between the left-right ends of the decorative material side fitting and the wall-side fitting. In this case, the first fixing hole or the second fixing hole can be the loose hole.

[0020] In a decorative material fixing structure according to one aspect of the present disclosure, the decorative material is a louver arranged with its longitudinal direction facing up and down, and a plurality of the decorative materials are fixed to the decorative material-side fittings at intervals in the left and right direction. The decorative material-side fittings are stringers that connect the plurality of louvers.

[0021] A method for constructing an exterior wall according to one aspect of the present disclosure is a method for constructing an exterior wall having a fixing structure for decorative material according to one aspect of the present disclosure, in which one vertical edge of the panel is inserted inside a panel insertion groove provided in one of the pair of uprights, each of which has the wall-side fittings fixed to its outdoor side. Next, by rotating the panel around one of the vertical sides of the panel, the other vertical side of the panel passes between the underside of the seat plate portion of the wall-side fitting, which is positioned so that it overlaps in the vertical direction with the crossbeam that holds the upper side of the panel, and the upper side of the seat plate portion of the wall-side fitting, which is positioned so that it overlaps in the vertical direction with the crossbeam that holds the lower side of the panel, and the other vertical side of the panel is inserted into the inside of the panel insertion groove provided in the other of the pair of uprights, thereby assembling the panel between the pair of uprights. Thereafter, the left and right ends of the decorative material-side fittings fixed to the decorative material are fixed to the seat plate portions of the wall-side fittings fixed to each of the pair of uprights. [Effects of the Invention]

[0022] According to the decorative material fixing structure according to one aspect of the present disclosure, interference between the panel and the wall-side metal fitting can be prevented during installation. [Brief explanation of the drawings]

[0023] [Figure 1] FIG. 1 is a schematic diagram showing an exterior wall of a building in which louvers are fixed to the exterior side of a curtain wall by a decorative material fixing structure according to a first example of an embodiment of the present disclosure. [Figure 2] FIG. 2 is a schematic cross-sectional view taken along line AA in FIG. [Figure 3] FIG. 3 is a schematic diagram showing the curtain wall in the first example before the louvers are fixed. [Figure 4] FIG. 4 is a cross-sectional view taken along line BB in FIG. [Figure 5] FIG. 5 is a cross-sectional view taken along line CC in FIG. [Figure 6] FIG. 6 is an enlarged view of the first type louver unit located at part D in FIG. [Figure 7] FIG. 7 is a partial enlarged view of the vertical intermediate portion (intermediate layer) of FIG. [Figure 8] FIG. 8 is a cross-sectional view taken along line EE in FIG. [Figure 9] FIG. 9 is a cross-sectional view taken along line FF in FIG. [Figure 10] FIG. 10 is a view corresponding to FIG. 9 and relating to a second type louver unit. [Figure 11] Figure 11 shows the louver units in isolation, where (A) is a first type louver unit placed at the top of the building, (B) is a first type louver unit placed at the middle floor of the building, (C) is a first type louver unit placed at the bottom of the building, (D) is a second type louver unit placed at the top of the building, (E) is a second type louver unit placed at the middle floor of the building, and (F) is a second type louver unit placed at the bottom of the building. [Figure 12] FIG. 12 is a cross-sectional view taken along line GG in FIG. 11(B). [Figure 13] FIG. 13 is a cross-sectional view taken along line HH in FIG. 11(E). [Figure 14] FIG. 14 is a cross-sectional view taken along line II in FIG. [Figure 15] FIG. 15 is a front view of a stringer that constitutes the decorative material fixing structure of the first example. [Figure 16] FIG. 16 is a cross-sectional view of a stringer that constitutes the fixing structure of the decorative material of the first example. [Figure 17]FIG. 17 is a perspective view of a part of a stringer that constitutes the fixing structure of the decorative material of the first example. [Figure 18] FIG. 18 shows a first bracket constituting the decorative material fixing structure of the first example, where (A) is a front view, (B) is a plan view, and (C) is a right side view. [Figure 19] FIG. 19 shows a second bracket constituting the fixing structure for a decorative material of the first example, where (A) is a front view, (B) is a plan view, and (C) is a right side view. [Figure 20] FIG. 20 is a cross-sectional view showing, in order of steps, part of the construction process for an exterior wall having the fixing structure for the decorative material of the first example. [Figure 21] FIG. 21 is a cross-sectional view taken along line JJ in FIG. 20(B). DETAILED DESCRIPTION OF THE INVENTION

[0024] [Example 1] A first example of an embodiment of the present disclosure will be described with reference to FIGS. 1 to 21. FIG.

[0025] In this example, a case will be described in which a decorative material fixing structure according to one embodiment of the present disclosure is applied to a structure for fixing a louver, which is a decorative material, to a curtain wall, which is a wall component.

[0026] The decorative material fixing structure of one embodiment of the present disclosure is not limited to a structure for fixing louvers to a curtain wall, but can be applied to a structure for fixing other decorative materials other than louvers, such as decorative panels and punched metal, to a curtain wall.

[0027] FIG. 1 shows an example of an exterior wall of a building 3, in which a plurality of louvers 2 are fixed to the exterior side of a curtain wall 1 by a decorative material fixing structure according to an embodiment of the present disclosure.

[0028] In the following description, the left-right direction and the up-down direction refer to the respective directions when the curtain wall 1 to which the louvers 2 are fixed is viewed from the front. Furthermore, one side in the left-right direction refers to the left side in Figures 1, 3, 5, 6, 9 to 13, and 20, and the other side in the left-right direction refers to the right side in Figures 1, 3, 5, 6, 9 to 13, and 20. Furthermore, the out-of-plane direction refers to the depth direction (projection direction) when the curtain wall 1 is viewed from the front, and the outdoor side in the out-of-plane direction is simply referred to as the "outdoor side," and the indoor side in the out-of-plane direction is simply referred to as the "indoor side." Below, the structure of the curtain wall 1 will be explained, followed by the fixing structure of the louvers 2.

[0029] [Overall structure of curtain wall] The curtain wall 1 forms the exterior wall of the building 3 .

[0030] The curtain wall 1 of this example is a mullion-type curtain wall, and includes a plurality of mullions 4, a plurality of mullions 5a, 5b, a plurality of glass panels 6, and a plurality of spandrel panels 7.

[0031] The mullions 4 are arranged with their longitudinal axes facing up and down and are fixed to the outdoor side of the main body 9 via mounting brackets 8. The transoms 5a, 5b are arranged with their longitudinal axes facing left and right and are connected to span between adjacent mullions 4 in the left and right direction. The glass panels 6 are installed in openings surrounded on all four sides by the mullions 4 and the transoms 5a, 5b and form the window section of the building 3. The spandrel panels 7 are installed in openings surrounded on all four sides by the mullions 4 and the transoms 5a, 5b and form the wall section of the building 3.

[0032] In the building 3 of this example, the glass panels 6 and spandrel panels 7 are arranged continuously in the left-right direction, sandwiching the mullions 4 therebetween, and the glass panels 6 and spandrel panels 7 are arranged alternately in the up-down direction, sandwiching the interlocks 5a, 5b therebetween. However, when implementing the decorative material fixing structure of the present disclosure, the types of panels that make up the curtain wall and the method of arranging the panels are not particularly limited.

[0033] The specific structure of each component of the curtain wall 1 will be described with reference to FIGS.

[0034] <Mullet> The mullion 4 is made of extruded aluminum alloy material and integrally comprises a rectangular column portion 10, a flat plate portion 11, and a connecting plate portion 12.

[0035] The rectangular column portion 10 has a rectangular cylindrical shape and is provided on the indoor side of the mullion 4. The flat plate portion 11 has a flat plate shape and is arranged with its thickness direction facing out of the plane. The flat plate portion 11 is provided at the outdoor end of the mullion 4. The connecting plate portion 12 has a flat plate shape and is arranged with its thickness direction facing left and right. The connecting plate portion 12 is provided in the middle part of the mullion 4 in the out-of-plane direction and connects the rectangular column portion 10 and the flat plate portion 11 in the out-of-plane direction. Specifically, the connecting plate portion 12 connects the left and right middle parts of the rectangular column portion 10 and the flat plate portion 11. In the illustrated example, the connecting plate portion 12 is not located in the center part of the rectangular column portion 10 and the flat plate portion 11 in the left and right direction, but is located biased to one side in the left and right direction (the left side in Figure 5).

[0036] The mullion 4 has a panel insertion groove 13a in a section surrounded on three sides by one left-right side portion of the rectangular column portion 10, the connecting plate portion 12, and one left-right side portion of the flat plate portion 11. The vertical sides of the glass panel 6 and the spandrel panel 7 on the other left-right side are inserted into the panel insertion groove 13a. The vertical sides of the glass panel 6 and the spandrel panel 7 on the other left-right side are held in the panel insertion groove 13a by a push edge 14a.

[0037] The mullion 4 has a panel insertion groove 13b in a section surrounded on three sides by the other left-right side portion of the rectangular column portion 10, the connecting plate portion 12, and the other left-right side portion of the flat plate portion 11. One left-right vertical edge of the glass panel 6 and the spandrel panel 7 is inserted into the panel insertion groove 13b. One left-right vertical edge of the glass panel 6 and the spandrel panel 7 is held in the panel insertion groove 13b by a push edge 14b.

[0038] In this example, the connecting plate portion 12 is positioned offset to one side in the left-right direction from the left-right center between the rectangular column portion 10 and the flat plate portion 11, so the groove depth (left-right depth) of the panel insertion groove 13a formed on one side of the connecting plate portion 12 in the left-right direction is greater than the groove depth (left-right depth) of the panel insertion groove 13b formed on the other side of the connecting plate portion 12 in the left-right direction.

[0039] Spacers 15 made of elastic material are sandwiched between the edges of the glass panels 6 and spandrel panels 7 and the mullions 4 and ridges 14a, 14b, and the spacers 15 are covered with sealing material 17.

[0040] <Mu-e> The linings 5a and 5b are made of extruded aluminum alloy material.

[0041] The crossbeam 5a is disposed between the upper end of the glass panel 6 and the lower end of the spandrel panel 7, and holds the upper edge of the glass panel 6 and the lower edge of the spandrel panel 7. Press-in edges 18a and 18b are engaged with the crossbeam 5a.

[0042] The crossbeam 5b is disposed between the lower end of the glass panel 6 and the upper end of the spandrel panel 7, and holds the lower edge of the glass panel 6 and the upper edge of the spandrel panel 7. Press-in edges 19a and 19b are engaged with the crossbeam 5b.

[0043] Spacers 15 made of elastic material are sandwiched between the edges of the glass panel 6 and the spandrel panel 7 and the interlinings 5a, 5b and ridges 18a, 18b, 19a, 19b, and the spacers 15 are covered with sealing material 17.

[0044] <Glass panel> The glass panel 6 is double-glazed and is set into the area surrounded on all four sides by the mullion 4 and the gables 5a and 5b. The glass panel 6 constitutes the window section of the building 3 and is arranged in a portion corresponding to the interior space. Note that single-glazed glass can also be used as the glass panel.

[0045] <Spandrel Panel> The spandrel panel 7 is erected in an area surrounded on all four sides by the mullions 4 and the crossbeams 5a, 5b. The spandrel panel 7 forms a wall of the building 3 and is arranged in an area corresponding to the attic space and the underfloor space. In this example, the vertical dimension of the spandrel panel 7 is smaller than the vertical dimension of the glass panel 6.

[0046] [Outline of the louver fixing structure] The louvers 2 are fixed to the exterior side of the curtain wall 1 and form the exterior wall of the building 3.

[0047] The louvers 2 are fixed to the curtain wall 1 using two types of metal fittings: stringers 21a and 21b which are decorative material-side metal fittings, and brackets 22a and 22b which are wall-side metal fittings.

[0048] Specifically, the louvers 2 are fixed to stringers 21 a and 21 b, the stringers 21 a and 21 b are fixed to brackets 22 a and 22 b, and the brackets 22 a and 22 b are fixed to the mullions 4 of the curtain wall 1.

[0049] The louvers 2 are arranged with their longitudinal directions facing up and down. The multiple louvers 2 are connected by multiple stringers 21a, 21b that are arranged with their longitudinal directions facing left and right, forming louver units 23a, 23b as shown in FIG.

[0050] The plurality of louvers 2 that make up the louver units 23a and 23b are arranged parallel to one another and at equal intervals in the left-right direction.

[0051] The louver units 23a, 23b are arranged continuously in the vertical and / or horizontal directions on the outdoor side of the curtain wall 1, arranged at intervals in the vertical and / or horizontal directions, or arranged randomly, thereby adding design to the exterior wall of the building 3.

[0052] Louver units 23a and 23b have different structures due to differences in their placement positions in building 3. That is, the louver units 23a are of a first type (multiple window type) that are placed continuously in the left-right direction and are placed in parts other than the left-right ends of building 3, while louver units 23b are of a second type (single window type) that are placed at the left-right ends of building 3 or are not placed continuously in the left-right direction.

[0053] 11(A) to 11(C), the first type louver unit 23a has a plurality of louvers 2 arranged at equal intervals in a range extending from an end portion on one side of the first stringer 21a in the left-right direction to a portion closer to the other side in the left-right direction, and no louvers are arranged at the end portion on the other side of the first stringer 21a in the left-right direction. In other words, the end portion on the other side of the first stringer 21a in the left-right direction protrudes in the left-right direction from the louver 2 arranged furthest on the other side in the left-right direction.

[0054] However, it is also possible to adopt a configuration in which the first type of louver unit has multiple louvers arranged at equal intervals in a range extending from the other left-right end of the first stringer to one side of the left-right direction, and no louvers are arranged at the end of one side of the first stringer in the left-right direction.

[0055] As shown in Figures 11(D) to 11(F), the second type louver unit 23b has multiple louvers 2 arranged at equal intervals in a range extending from one end of the second stringer 21b in the left-right direction to the other end of the second stringer 21b in the left-right direction. The second stringer 21b constituting the second type louver unit 23b is slightly longer in length than the first stringer 21a. The second type louver unit 23b has one more louver 2 than the first type louver unit 23a.

[0056] 1 and 11, the first type louver unit 23a is configured by eight louvers 2 connected to two or three first stringers 21a, and the second type louver unit 23b is configured by nine louvers 2 connected to two or three second stringers 21b. However, the number of louvers constituting a louver unit is not limited to eight or nine.

[0057] As shown in Figures 11(B) and 11(E), louver units 23a and 23b arranged on the middle floors of building 3 are configured with eight or nine louvers 2 connected by two stringers 21a and 21b at the top and bottom. In contrast, as shown in Figures 11(A), 11(C), 11(D), and 11(E), louver units 23a and 23b arranged on the top and bottom of building 3 are configured with eight or nine louvers 2 connected by three stringers 21a and 21b.

[0058] The louver units 23a, 23b are fixed to the curtain wall 1 by fixing the left and right end portions of the stringers 21a, 21b to brackets 22a, 22b.

[0059] The first type louver unit 23a is fixed to the curtain wall 1 by fixing both left and right end portions of two or three first stringers 21a to first brackets 22a.

[0060] The second type louver unit 23b is fixed to the curtain wall 1 by fixing both the left and right ends of two or three second stringers 21b to the second bracket 22b, or by fixing one end of two or three second stringers 21b to the second bracket 22a and the other end to the second bracket 22b.

[0061] For this reason, the louver units 23a and 23b are fixed to the curtain wall 1 via four or six brackets 22a and 22b.

[0062] The louver units 23a, 23b are pre-assembled in a factory and transported to the construction site of the building 3. The louver units 23a, 23b are then lifted using a crane or the like and fixed to the brackets 22a, 22b that have been pre-fixed to the mullions 4 in the factory. In this example, the louver 2 is fixed to the outdoor side of the curtain wall 1 using this construction procedure. Details of the construction procedure will be described later.

[0063] [Details of the louver fixing structure] The fixing structure of the louver 2 will now be described in detail.

[0064] [Fixing structure between louvers and stringers] The louvers 2 are fixed to the stringers 21a and 21b using first fastening members 24 having shaft portions 25 arranged with the central axes directed horizontally and out of the plane.

[0065] The first fastening member 24 includes a bolt 27 having a shaft portion 25 and a head portion 26, a nut 28, and a washer 29. In this example, the bolt 27 is a rectangular bolt having a rectangular plate-shaped head portion 26, and the nut 28 is a locking nut.

[0066] <Louver> The louvers 2 are made of extruded aluminum alloy and have a generally rectangular cylindrical shape. However, when implementing the decorative material fixing structure of the present disclosure, the decorative material is not limited to louvers, and the material and shape of the louvers are not particularly limited.

[0067] In this example, the width dimension (visible dimension) of the louver 2 in the left-right direction is slightly smaller than the width dimension of the flat plate portion 11 of the mullion 4 in the left-right direction.

[0068] The vertical dimension (length dimension) of the louvers 2 is larger than the vertical dimension of the glass panel 6. In this example, the vertical dimension of the louvers 2 is approximately the same as the vertical dimension of the mullions 4. Furthermore, the vertical dimension of the louvers 2 that make up the louver units 23a, 23b arranged on the middle floor of the building 3 is different from the vertical dimension of the louvers 2 that make up the louver units 23a, 23b arranged on the top and bottom of the building 3. Specifically, the vertical dimension of the louvers 2 that make up the louver units 23a, 23b arranged on the top and bottom of the building 3 is slightly larger than the vertical dimension of the louvers 2 that make up the louver units 23a, 23b arranged on the middle floor of the building 3.

[0069] The louver 2 has a storage section 30 that can store the head 26 of the bolt 27 so that it cannot rotate. The storage section 30 is open on both end faces of the louver 2 in the vertical direction. The left-right dimension of the storage section 30 is set to a size that prevents the head 26 of the bolt 27 from rotating inside the storage section 30. The out-of-plane dimension of the storage section 30 is slightly larger than the thickness dimension of the head 26 of the bolt 27. The storage section 30 is provided in the left-right center of the indoor end of the louver 2. The storage section 30 is provided along the entire length of the louver 2.

[0070] The louver 2 has an insertion portion 31 through which the shaft 25 of the bolt 27 can be inserted. The insertion portion 31 penetrates the indoor wall portion 32 of the louver 2 in the out-of-plane direction and communicates with the storage portion 30. The insertion portion 31 is configured in a slit shape and opens on both end faces in the vertical direction of the louver 2 and in the center in the horizontal direction of the indoor side surface. The insertion portion 31 is provided along the entire length of the louver 2.

[0071] Both upper and lower end faces of the louver 2 are covered by a cover 20. The cover 20 fixed to the lower end face of the louver 2 has a drain hole 66 formed therein.

[0072] Stringer The stringers 21 a, 21 b indirectly fix the louvers 2 to the curtain wall 1.

[0073] The stringers 21a and 21b are long members made of extruded aluminum alloy material, and are arranged with their longitudinal directions oriented in the left-right direction.

[0074] The first type louver unit 23a includes a plurality of first stringers 21a that are spaced apart in the vertical direction and arranged parallel to one another.

[0075] As shown in Figures 11(A) to 11(C), each of the first louver units 23a arranged on the middle floors, at the top, and at the bottom of the building 3 has two first stringers 21a fixed to the upper and lower portions of the louver 2. As shown in Figure 11(A), the first louver unit 23a arranged at the top of the building 3 has one first stringer 21a fixed to the upper end of the louver 2 in addition to two first stringers 21a fixed to the upper and lower portions of the louver 2. As shown in Figure 11(C), the first louver unit 23a arranged at the bottom of the building 3 has one first stringer 21a fixed to the lower end of the louver 2 in addition to two first stringers 21a fixed to the upper and lower portions of the louver 2.

[0076] Of the multiple first stringers 21a fixed to the louver 2, the first stringers 21a fixed to the upper portions (upper and lower ends) of the louver 2 and the first stringers 21a fixed to the lower portions of the louver 2 have shapes that are symmetrical in the vertical direction.

[0077] As shown in Figure 9, the length dimension of the first stringer 21a is slightly smaller than the length dimension from one end face of the left-right mullions 4 on one side of a pair of adjacent mullions 4 to one end face of the other mullions 4 on the other side of the pair of adjacent mullions 4.

[0078] The second type louver unit 23b is made up of a plurality of second stringers 21b which are arranged parallel to one another and spaced apart in the vertical direction.

[0079] As shown in Figures 11(D) to 11(F), each of the second louver units 23b arranged on the middle floors, at the top, and at the bottom of the building 3 has two second stringers 21b fixed to the upper and lower portions of the louver 2. As shown in Figure 11(D), the second louver unit 23b arranged at the top of the building 3 has one second stringer 21b fixed to the upper end of the louver 2 in addition to two second stringers 21b fixed to the upper and lower portions of the louver 2. As shown in Figure 11(F), the second louver unit 23b arranged at the bottom of the building 3 has one second stringer 21b fixed to the lower end of the louver 2 in addition to two second stringers 21b fixed to the upper and lower portions of the louver 2.

[0080] Of the multiple second stringers 21b fixed to the louver 2, the second stringers 21b fixed to the upper portion, upper end and lower end of the louver 2 and the second stringers 21b fixed to the lower portion of the louver 2 have shapes that are symmetrical in the vertical direction.

[0081] As shown in Figure 10, the length dimension of the second stringer 21b is the same as the length dimension from the end face on one side of the mullions 4 on one side of the left-right direction to the end face on the other side of the mullions 4 on the other side of the left-right direction, among a pair of mullions 4 arranged adjacent to each other in the left-right direction.

[0082] The first stringer 21a constituting the first type louver unit 23a and the second stringer 21b constituting the second type louver unit 23b have the same basic configuration, except for the length dimension in the left-right direction and the number of notches 35 formed, which will be described later. For this reason, the first stringer 21a and the second stringer 21b will be described together.

[0083] The stringers 21a and 21b include a vertical plate portion 33 and a horizontal plate portion 34. The stringers 21a and 21b have an end face shape that is substantially L-shaped when viewed from the left-right direction.

[0084] The stringers 21a, 21b are arranged in positions that overlap with the stringers 5a, 5b in the out-of-plane direction, except for the stringers 21a, 21b fixed to the upper ends of the louvers 2 that constitute the louver units 23a, 23b arranged at the top of the building 3, and the stringers 21a, 21b fixed to the lower ends of the louvers 2 that constitute the louver units 23a, 23b arranged at the bottom of the building 3.

[0085] The vertical plate portion 33 extends in the vertical direction along the indoor side of the louver 2 facing the curtain wall 1, and is fixed to the louver 2 by the first fastening member 24.

[0086] The vertical plate portion 33 has a plurality of cutouts 35. Specifically, the vertical plate portion 33 has the same number of cutouts 35 as the louvers 2 that constitute the louver units 23a, 23b. Therefore, the first stringer 21a that constitutes the first type louver unit 23a has eight cutouts 35, and the second stringer 21b that constitutes the second type louver unit 23b has nine cutouts 35. The plurality of cutouts 35 are arranged spaced apart in the left-right direction at an equal pitch as the louvers 2 that constitute the louver units 23a, 23b.

[0087] The notch 35 allows the shank 25 of the bolt 27 to be inserted in the axial direction (out-of-plane direction) and up-down direction of the shank 25. The width dimension of the notch 35 is slightly larger than the outer diameter of the shank 25 and smaller than the outer diameters of the head 26, the nut 28, and the washer 29.

[0088] The notches 35 are formed in a range extending from the vertical middle portion of the vertical plate portion 33 to the other vertical end portion. The notches 35 open at the other vertical end portion of the vertical plate portion 33. The notches 35 of the stringers 21a, 21b fixed to the upper portion, upper end portion, and lower end portion of the louver 2 open at the upper end portion of the vertical plate portion 33. In contrast, the notches 35 of the stringers 21a, 21b fixed to the lower portion of the louver 2 open at the lower end portion of the vertical plate portion 33.

[0089] The vertical plate portion 33 has an engagement portion 36 at the other end in the vertical direction. The engagement portions 36 of the stringers 21a, 21b fixed to the upper portion, upper end, and lower end of the louver 2 are provided at the upper end of the vertical plate portion 33. In contrast, the engagement portions 36 of the stringers 21a, 21b fixed to the lower portion of the louver 2 are provided at the lower end of the vertical plate portion 33.

[0090] The engaging portion 36 is engageable at least in the vertical direction with a portion of the first fastening member 24. In this example, the engaging portion 36 is engageable with a portion of the first fastening member 24 in the vertical direction and the axial direction of the shaft portion 25.

[0091] 14 and 16, the engaging portion 36 is formed by a recessed groove. The engaging portion 36 has a rectangular cross-sectional shape. The depth dimension (vertical dimension) and width dimension (out-of-plane dimension) of the engaging portion 36 are smaller than the plate thickness dimension of the vertical plate portion 33. In this example, the width dimension of the engaging portion 36 is slightly larger than the plate thickness dimension of the washer 29 that constitutes the first fastening member 24.

[0092] The engagement portion 36 is provided over the entire length of the vertical plate portion 33. However, it is also possible to provide engagement portions only on both sides of the portion where the notch is opened at the other end of the vertical plate portion in the up-down direction.

[0093] In this example, a hook portion 37 is provided at the other end of the vertical plate portion 33 in the vertical direction. The hook portion 37 has a hook shape. The hook portion 37 has a base portion 37a with a rectangular cross section located on the outdoor side, a bulging portion 37b with a generally triangular cross section located on the indoor side, and a return portion 37c that protrudes in the vertical direction from the indoor end of one of the upper and lower side surfaces of the bulging portion 37b. The engagement portion 36 is formed by a recessed groove defined by one of the upper and lower end portions of the indoor side surface of the base portion 37a in the vertical direction, the outdoor portion of one of the upper and lower side surfaces of the bulging portion 37b, and the outdoor side surface of the return portion 37c.

[0094] 8, the hook portions 37 of the stringers 21a, 21b fixed to the upper portions (upper and lower ends) of the louver 2 are provided at the upper ends of the vertical plate portions 33, and the engagement portions 36 open downward. In contrast, the hook portions 37 of the stringers 21a, 21b fixed to the lower portions of the louver 2 are provided at the lower ends of the vertical plate portions 33, and the engagement portions 36 open upward.

[0095] The bulging portion 37b of the hook portion 37 has an inclined surface 37d on the indoor side that is inclined in a direction toward the indoor side as it approaches one side in the vertical direction. Therefore, the end portion on the other side in the vertical direction of the vertical plate portion 33 has a tapered shape.

[0096] The horizontal plate portion 34 is bent from one end of the vertical plate portion 33 in the up-down direction in a direction substantially perpendicular to the vertical plate portion 33 .

[0097] The horizontal plate portions 34 of the stringers 21a, 21b fixed to the upper portions, upper end, and lower end of the louver 2 are bent from the lower end of the vertical plate portions 33 toward the indoor side. In contrast, the horizontal plate portions 34 of the stringers 21a, 21b fixed to the lower portion of the louver 2 are bent from the upper end of the vertical plate portions 33 toward the indoor side.

[0098] As shown in FIGS. 9 and 10, the horizontal plate portion 34 has both left and right end portions fixed to the brackets 22a and 22b.

[0099] In this example, one right end of the horizontal plate 34 is fixed to the brackets 22a, 22b so as to prevent relative left-right movement, and the other left-right end is fixed to the brackets 22a, 22b so as to allow relative left-right movement. However, it is also possible to fix one right end of the horizontal plate to allow relative left-right movement with respect to the brackets, and fix the other left-right end of the horizontal plate to prevent relative left-right movement with respect to the brackets.

[0100] As shown in FIGS. 12 and 13, the horizontal plate portion 34 has a first fixing hole 38 at one end in the left-right direction and a second fixing hole 39 at the other end in the left-right direction.

[0101] In this example, the first fixing holes 38 are circular holes having an inner diameter slightly larger than the outer diameter of the shaft portions 42 of the second fastening members 41 (described later). In contrast, the second fixing holes 39 are loose holes that allow relative movement in the left-right direction between the other left-right end portions of the stringers 21a, 21b and the brackets 22a, 22b. Specifically, the second fixing holes 39 are loose holes that are larger in dimension in at least the left-right direction than the first fixing holes 38. In this example, the second fixing holes 39 are configured as elongated holes that are long in the left-right direction. However, the second fixing holes may also be configured as circular holes with a larger diameter than the first fixing holes.

[0102] In addition, when the end portion on one right side of the horizontal plate portion is fixed so that it can move relative to the bracket in the left-right direction, and the end portion on the other left-right side of the horizontal plate portion is fixed so that it cannot move relative to the bracket in the left-right direction, the first fixing hole can be a loose hole and the second fixing hole can be a circular hole.

[0103] The louvers 2 are fastened to the stringers 21a and 21b by accommodating the heads 26 in the accommodation portions 30 of the louvers 2, loosely fitting washers 29 onto the shaft portions 25 that are inserted in the out-of-plane direction through the insertion portions 31 of the louvers 2 and the notches 35 of the stringers 21a and 21b, and screwing in nuts 28. That is, the louvers 2 are fastened to the stringers 21a and 21b by clamping the indoor side wall portions 32 of the louvers 2 and the vertical plate portions 33 of the stringers 21a and 21b with the heads 26 of the bolts 27, the washers 29, and the nuts 28. The work of fastening the louvers 2 to the stringers 21a and 21b can be performed at a construction site, but in this example, it is performed in a factory to improve workability.

[0104] 8 and 14, the washer 29 constituting the first fastening member 24 is disposed in a position facing the engaging portion 36 in the vertical direction, with a gap in between. Therefore, in this example, the washer 29 is engageable with the engaging portion 36. That is, the vertical end of the washer 29 is engageable with the engaging portion 36 in the vertical direction and in the axial direction of the shaft portion 25.

[0105] However, when implementing the decorative material fixing structure of the present disclosure, it is also possible to make other components constituting the fastening member, rather than a washer, engage with the engaging portion by, for example, changing the structure of the engaging portion. Specifically, the engaging portion and the nut can be engaged by increasing the width of the engaging portion. Alternatively, the engaging portion and the head of the fastening member can be engaged by increasing the width of the engaging portion and reversing the arrangement of the nut and the head.

[0106] The louver 2 has a fall prevention portion 40 that can be engaged in the vertical direction with the upper end of the vertical plate portion 33 of the stringers 21a, 21b fixed to the upper portion of the louver 2.

[0107] The fall prevention unit 40 is fixed to the indoor side wall portion 32 of the louver 2. The fall prevention unit 40 has a crank-shaped end face shape, and covers the upper ends of the vertical plate portions 33 of the stringers 21a, 21b fixed to the upper portion of the louver 2 from above and from the indoor side. Therefore, the fall prevention unit 40 can engage with the upper ends of the vertical plate portions 33 in the vertical direction and in the axial direction of the shaft portion 25 (out-of-plane direction).

[0108] In this example, the fall prevention units 40 are made of extruded aluminum alloy material and are provided in the same number as the louvers 2. One fall prevention unit 40 is fixed to each of all the louvers 2 that make up the louver units 23a, 23b. Note that Figures 9, 10, 12, and 13 only show the fall prevention units 40 fixed to some of the louvers 2, and the fall prevention units fixed to the other louvers 2 are omitted.

[0109] [Stringer and bracket fixing structure] The stringers 21a and 21b are fixed to the brackets 22a and 22b using second fastening members 41 each having a shaft portion 42 whose central axis is oriented vertically.

[0110] Specifically, the ends on both the left and right sides of the horizontal plate portions 34 that constitute the stringers 21a and 21b are fixed to the brackets 22a and 22b using second fastening members 41.

[0111] In this example, the second fastening member 41 includes a bolt 44 having a shaft portion 42 and a head portion 43, a nut 45, and a washer 46.

[0112] <bracket> The brackets 22 a and 22 b are fixed to the exterior side of the mullions 4 that make up the curtain wall 1 .

[0113] Brackets 22a, 22b are arranged in positions that overlap vertically with stringers 5a, 5b, except for brackets 22a, 22b fixed to stringers 21a, 21b at the upper ends of louver units 23a, 23b arranged at the top of building 3, and brackets 22a, 22b fixed to stringers 21a, 21b at the lower ends of louver units 23a, 23b arranged at the bottom of building 3.

[0114] The first bracket 22a, which is used only to fix the first type louver unit 23a, and the second bracket 22b have different structures, so the first bracket 22a will be explained first, followed by an explanation of the second bracket 22b.

[0115] (First bracket) The first bracket 22a is made of a stainless steel plate and includes a first standing wall portion 47 and a first seat plate portion 48. The first bracket 22a has a substantially L-shaped end face when viewed from the left-right direction.

[0116] The first standing wall portion 47 extends vertically along the outdoor side of the mullion 4 and is fixed to the outdoor side of the mullion 4 by a third fastening member 49. In this example, the first standing wall portion 47 is fixed to the outdoor side of the flat plate portion 11 that constitutes the mullion 4.

[0117] The first standing wall portion 47 has a first through hole 50. In this example, the first standing wall portion 47 has two first through holes 50. The two first through holes 50 are arranged spaced apart in the vertical direction. The flat plate portion 11 has a through hole 51 in a portion facing the first through hole 50.

[0118] The third fastening member 49 includes a bolt 54 having a shaft portion 52 and a head portion 53 , a nut 55 , and a washer 56 .

[0119] The first standing wall portion 47 is fixed to the outdoor side of the flat plate portion 11 by loosely fitting a washer 56 onto the tip of a shaft portion 52 that is inserted through the first through-hole 50 and the through-hole 51 from the outdoor side to the indoor side and then screwing in a nut 55. That is, the first standing wall portion 47 and the flat plate portion 11 are clamped together by the head 53 of the bolt 54, the washer 56, and the nut 55, thereby fastening the first bracket 22a to the flat plate portion 11. The shaft portion 52 of the bolt 54 is disposed approximately parallel to the shaft portion 25 that constitutes the first fastening member 24, and is disposed on the other left-right side of the connecting plate portion 12 that constitutes the upright 4. Although the work of fixing the first bracket 22a to the upright 4 can be performed at a construction site, in this example it is performed in a factory to improve workability.

[0120] As shown in Figures 5 and 9, the first standing wall portion 47 is fixed to the outdoor side of the mullion 4 without protruding from the mullion 4 in the left-right direction. In this example, the left-right width dimension of the first standing wall portion 47 is the same as the left-right width dimensions of the flat plate portion 11 and the rectangular column portion 10. Therefore, the end face on one left-right side of the first standing wall portion 47 is located on the same plane as the end face on one left-right side of the flat plate portion 11, and the end face on the other left-right side of the first standing wall portion 47 is located on the same plane as the end face on the other left-right side of the flat plate portion 11. However, the left-right width dimension of the first standing wall portion may be smaller than the left-right width dimension of the mullion.

[0121] The first seat panel portion 48 is bent toward the outdoors from the lower end portion of the first standing wall portion 47. In this example, the first seat panel portion 48 is bent from the lower end portion of the first standing wall portion 47 at a right angle.

[0122] A portion of the first seat panel 48 protrudes laterally from the mullion 4. In this example, one half of the first seat panel 48 protrudes laterally from the flat panel 11 of the mullion 4. The end face of the first seat panel 48 on one side in the left-right direction is located to the left-right side of the end face of the flat panel 11 on one side in the left-right direction. The end face of the first seat panel 48 on the other side in the left-right direction is located on the same plane as the end face of the flat panel 11 on the other side in the left-right direction. The amount of protrusion of the first seat panel 48 from the mullion 4 can be determined taking into account the amount of engagement with the left-right ends of the stringers 21a, 21b, the weight of the louver units 23a, 23b, the amount of thermal expansion of the stringers 21a, 21b, etc. In this example, the amount of protrusion is approximately the same as the left-right dimension of the mullion 4. The first seat panel 48 can also protrude laterally from the mullion 4 only by the other half of the left-right direction, rather than by the one half of the left-right direction.

[0123] The first seat panel portion 48 has a main body portion 57 arranged in a portion overlapping with the upright 4 in the out-of-plane direction, and a protruding portion 58 protruding in the left-right direction from the upright 4.

[0124] In this example, the width dimension in the left-right direction of the main body 57 and the width dimension in the left-right direction of the overhanging portion 58 are the same. The out-of-plane dimension of the overhanging portion 58 is smaller than the out-of-plane dimension of the main body 57. The indoor-side end face of the overhanging portion 58 is positioned offset toward the outdoor side from the indoor-side end face of the main body 57, and is connected to the indoor-side portion of one of the left-right end faces of the main body 57. The outdoor-side end face of the overhanging portion 58 is located on the same plane as the outdoor-side end face of the main body 57.

[0125] The main body portion 57 has a third fixing hole 59 , and the protruding portion 58 has a fourth fixing hole 60 .

[0126] In this example, the third fixing hole 59 and the fourth fixing hole 60 are circular holes having an inner diameter slightly larger than the outer diameter of the shaft portion 42 of the second fastening member 41 .

[0127] However, if the first and second fixing holes provided in the stringer are circular holes with an inner diameter slightly larger than the outer diameter of the shaft portion of the second fastening member, either the third or fourth fixing hole can be a loose hole that allows relative left-right movement between the left-right ends of the stringer and the bracket.

[0128] The center of the third fixing hole 59 is located in the left-right center of the main body 57. In contrast, the center of the fourth fixing hole 60 is located in a portion of the protrusion 58 that is closer to one side in the left-right direction. The out-of-plane positions of the centers of the third fixing hole 59 and the fourth fixing hole 60 are the same.

[0129] As shown in Figure 8, the first seat plate portion 48 of the first bracket 22a, which is positioned so that it overlaps with the crossbeam 5a in the vertical direction, has its upper surface positioned below the lower end surface of the spandrel panel 7, the lower edge of which is held by the crossbeam 5a, and its lower surface positioned above the upper end surface of the glass panel 6, the upper edge of which is held by the crossbeam 5a.

[0130] In contrast, the first seat plate portion 48 of the first bracket 22a, which is positioned at a position where it overlaps with the crossbeam 5b in the vertical direction, has its upper surface positioned below the lower end surface of the glass panel 6, the lower edge of which is held by the crossbeam 5b, and its lower surface positioned above the upper end surface of the spandrel panel 7, the upper edge of which is held by the crossbeam 5b.

[0131] As shown in Figure 9, one end of the horizontal plate portion 34 of the first stringer 21a in the left-right direction is fixed to the first seat plate portion 48 of the first bracket 22a fixed to the mullion 4 on one side in the left-right direction of a pair of mullions 4 arranged adjacent to each other in the left-right direction. The other end of the horizontal plate portion 34 of the first stringer 21a in the left-right direction is fixed to the first seat plate portion 48 of the first bracket 22a fixed to the mullion 4 on the other side in the left-right direction of the pair of mullions 4 arranged adjacent to each other in the left-right direction.

[0132] Specifically, one end of the horizontal plate portion 34 of the first stringer 21a in the left-right direction is fixed to the main body 57 of the first bracket 22a, which is fixed to one of the pair of mullions 4 arranged adjacent to each other in the left-right direction, by the second fastening member 41 so as to prevent relative movement in the left-right direction. That is, the one end of the horizontal plate portion 34 in the left-right direction is fixed to the main body 57 of the first bracket 22a so as to prevent relative movement in the left-right direction by loosely fitting a washer 46 and screwing a nut 45 onto the tip of the shaft portion 42 of a bolt 44 that is inserted from below to above the first fixing hole 38 and the third fixing hole 59, both of which are circular holes, with the one end of the horizontal plate portion 34 placed on the main body 57 of the first bracket 22a.

[0133] The other left-right end of the horizontal plate portion 34 of the first stringer 21a is fixed to the protruding portion 58 of the first bracket 22a, which is fixed to the other left-right mullions 4 of a pair of adjacent left-right mullions 4, by the second fastening member 41 so as to be movable relative to the left-right direction. That is, the other left-right end of the horizontal plate portion 34 is fixed so as to be movable relative to the left-right direction by loosely fitting a washer 46 and screwing a nut 45 onto the tip of the shaft portion 42 of a bolt 44, which is inserted from bottom to top through the second fixing hole 39, which is a loose hole, and the fourth fixing hole 60, which is a circular hole, with the other left-right end of the horizontal plate portion 34 placed on the protruding portion 58 of the first bracket 22a. Note that a noise prevention material can be sandwiched between the other left-right end of the horizontal plate portion 34 and the protruding portion 58.

[0134] Ends of separate first stringers 21a arranged adjacently in the left-right direction are fixed to the main body portion 57 and the overhanging portion 58 that constitute the first bracket 22a. Of the main body portion 57 and the overhanging portion 58 that constitute the first bracket 22a, a gap 61 is provided between the left-right end face of the first stringer 21a fixed to the overhanging portion 58 and the left-right end face of the first stringer 21a fixed to the main body portion 57. The left-right dimension of the gap 61 is determined taking into account the amount of thermal expansion of the first stringer 21a, and is approximately several millimeters to a dozen millimeters.

[0135] (Second bracket) The second bracket 22b is made of a stainless steel plate and includes a second standing wall portion 62 and a second seat plate portion 63. The second bracket 22b has a substantially L-shaped end face when viewed from the left-right direction.

[0136] The second standing wall portion 62 extends vertically along the outdoor side of the mullion 4 and is fixed to the outdoor side of the mullion 4 by a third fastening member 49. In this example, the second standing wall portion 62 is fixed to the outdoor side of the flat plate portion 11 that constitutes the mullion 4.

[0137] The second standing wall portion 62 has a second through hole 64. In this example, the second standing wall portion 62 has two second through holes 64. The two second through holes 64 are arranged spaced apart in the vertical direction. The flat plate portion 11 has a through hole 51 in a portion facing the second through hole 64.

[0138] The second standing wall portion 62 is fixed to the outdoor side of the flat plate portion 11 by loosely fitting a washer 56 onto the tip of the shaft portion 52, which is inserted through the second through-hole 64 and the through-hole 51 from the outdoor side to the indoor side, and screwing in a nut 55. That is, the second standing wall portion 62 and the flat plate portion 11 are clamped between the head 53 of the bolt 54, the washer 56, and the nut 55, thereby fastening and fixing the second bracket 22b to the flat plate portion 11. The shaft portion 52 of the bolt 54 is disposed approximately parallel to the shaft portion 25 constituting the first fastening member 24, and is disposed on the other left-right side of the connecting plate portion 12 constituting the mullion 4. The work of fixing the second bracket 22b to the mullion 4 can be performed at a construction site, but in this example, it is performed in a factory to improve workability.

[0139] As shown in Figure 10, the second standing wall portion 62 is fixed to the outdoor side of the mullion 4 without protruding from the mullion 4 in the left-right direction. In this example, the left-right width dimension of the second standing wall portion 62 is the same as the left-right width dimensions of the flat plate portion 11 and the rectangular column portion 10. Therefore, the end face on one left-right side of the second standing wall portion 62 is located on the same plane as the end face on one left-right side of the flat plate portion 11, and the end face on the other left-right side of the second standing wall portion 62 is located on the same plane as the end face on the other left-right side of the flat plate portion 11. However, the left-right width dimension of the second standing wall portion may be smaller than the left-right width dimension of the mullion.

[0140] The second seat panel portion 63 is bent toward the outdoors from the lower end portion of the second standing wall portion 62. In this example, the second seat panel portion 63 is bent from the lower end portion of the second standing wall portion 62 at a right angle.

[0141] The second seat panel portion 63 does not protrude in the left-right direction from the upright 4. In this example, the left-right width dimension of the second seat panel portion 63 is the same as the left-right width dimension of the second standing wall portion 62. Therefore, the end face on one left-right side of the second seat panel portion 63 is located on the same plane as the end face on one left-right side of the second standing wall portion 62, and the end face on the other left-right side of the second seat panel portion 63 is located on the same plane as the end face on the other left-right side of the second standing wall portion 62. However, the left-right width dimension of the second seat panel portion may be different from the left-right width dimension of the second standing wall portion.

[0142] The second seat plate portion 63 has only one fifth fixing hole 65 .

[0143] In this example, the fifth fixing hole 65 is a circular hole having an inner diameter slightly larger than the outer diameter of the shaft portion 42 of the second fastening member 41.

[0144] The center of the fifth fixing hole 65 is located at the center of the second seat plate portion 63 in the left-right direction.

[0145] One end of the horizontal plate portion 34 of the second stringer 21b in the left-right direction is fixed to the second seat plate portion 63 of the second bracket 22b, which is fixed to one of the pair of mullions 4 arranged adjacent to each other in the left-right direction, by the second fastening member 41 so as to prevent relative movement in the left-right direction. That is, the one end of the horizontal plate portion 34 in the left-right direction is fixed to the other end of the horizontal plate portion 34 in the left-right direction so as to prevent relative movement in the left-right direction by loosely fitting a washer 46 and screwing a nut 45 onto the tip of the shaft portion 42 of a bolt 44 that is inserted from bottom to top through the first fixing hole 38 and the fifth fixing hole 65, both of which are circular holes, with the one end of the horizontal plate portion 34 placed on the second seat plate portion 63 of the second bracket 22b.

[0146] The other left-right end of the horizontal plate portion 34 of the second stringer 21b is fixed to the second seat plate portion 63 of the second bracket 22b, which is fixed to the other left-right mullions 4 of a pair of left-right adjacent mullions 4, by the second fastening member 41 so as to be movable relative to the left-right direction. That is, with the other left-right end of the horizontal plate portion 34 placed on the second seat plate portion 63 of the second bracket 22b, a washer 46 is loosely fitted on the tip of the shaft portion 42 of a bolt 44, which is inserted from bottom to top through the second fixing hole 39, which is a loose hole, and the fifth fixing hole 65, which is a circular hole, and a nut 45 is screwed into the bolt 44, thereby allowing relative movement in the left-right direction. Note that a noise prevention material can also be sandwiched between the other left-right end of the horizontal plate portion 34 and the second seat plate portion 63.

[0147] [Exterior wall construction method] Next, the construction method (construction procedure) for the exterior wall of building 3 will be described.

[0148] First, the mullions 4 are fixed to the outdoor side of the frame 9 that constitutes the building 3 using the mounting brackets 8. Brackets 22a, 22b are fixed to the mullions 4 in advance at the manufacturing factory using third fastening members 49. Then, the latticework 5a, 5b is connected so as to span between a pair of adjacent mullions 4 in the left-right direction.

[0149] Next, the glass panel 6 and the spandrel panel 7 are erected in the area surrounded on all four sides by the pair of mullions 4 adjacent to each other in the left-right direction and the pair of crossbeams 5a, 5b adjacent to each other in the up-down direction.

[0150] Since the work of erecting the glass panel 6 and the work of erecting the spandrel panel 7 are basically the same, the work of erecting the glass panel 6 will be described below with reference to FIGS. 20 and 21.

[0151] 20(A), the vertical side of one of the left and right directions of the glass panel 6 is inserted obliquely from the outside into the panel insertion groove 13b provided in one of the left and right mullions 4 of a pair of left and right adjacent mullions 4. In this example, the vertical side of the glass panel 6 is first inserted into the panel insertion groove 13b, which has the greater groove depth.

[0152] 20(B) and 20(C), the glass panel 6 is rotated about one vertical side in the left-right direction, and the other vertical side of the glass panel 6 is inserted from the outside into the panel insertion groove 13a of the other mullions 4 of the pair of mullions 4. In other words, the glass panel 6 is fitted between the pair of mullions 4 adjacent in the left-right direction in a kendon style.

[0153] In the case of a glass panel 6 in which the first type louver unit 23a is attached to the outdoor side, when the vertical edge on the other side in the left-right direction is inserted into the panel insertion groove 13a, as shown in Figures 20(B) and 21, the end portion on the other side in the left-right direction of the glass panel 6 passes between the underside of the protrusion portion 58 of the upper first bracket 22a, which is positioned at a position where it overlaps in the vertical direction with the transverse 5a that holds the upper edge of the glass panel 6, and the upper surface of the protrusion portion 58 of the lower first bracket 22a, which is positioned at a position where it overlaps in the vertical direction with the transverse 5b that holds the lower edge of the glass panel 6, and also passes through one side in the left-right direction of the first standing wall portion 47 of the lower first bracket 22a, which is positioned at a position where it overlaps in the vertical direction with the transverse 5b, as shown in Figure 20(C).

[0154] In the case of a glass panel 6 in which the second type louver unit 23b is attached to the outdoor side, when the vertical edge on the other left-right side is inserted into the panel insertion groove 13a, the end portion on the other left-right side of the glass panel 6 does not pass between the underside of the second seat plate portion 63 of the upper second bracket 22b, which is positioned at a position where it overlaps in the vertical direction with the transverse ...

[0155] After the vertical sides of the glass panel 6 on both the left and right sides are inserted into the panel insertion grooves 13a, 13b as described above, the press edges 14a, 14b, 18a, 19a are engaged with the glass panel 6 so as to sandwich the spacer 15 between them. Then, the spacer 15 is covered with the sealing material 17.

[0156] Separately from the construction work of the curtain wall 1 at the construction site, in the factory, the louvers 2 and the stringers 21a, 21b are fixed together using first fastening members 24, thereby connecting the multiple louvers 2 with the multiple stringers 21a, 21b to assemble the louver units 23a, 23b. The louver units 23a, 23b are then transported to the construction site and, using a crane or the like, are lifted up to the points on the curtain wall 1 where the louver units 23a, 23b will be fixed.

[0157] Then, the left and right ends of the stringers 21a and 21b that make up the louver units 23a and 23b are fixed to the first seat plate portion 48 and the second seat plate portion 63 of the brackets 22a and 22b fixed to the outdoor side of the upright 4 using the second fastening members 41.

[0158] In this example, the exterior wall of building 3 is constructed through the above-described steps.

[0159] According to this example, interference between the glass panel 6 and the spandrel panel 7 and the brackets 22a and 22b can be prevented during installation.

[0160] In other words, in this example, of the brackets 22a, 22b, the first vertical wall portion 47 and the second vertical wall portion 62, which are fixed to the outdoor side of the upright 4, are made not to protrude left and right from the upright 4, and the vertical positions of the upper and lower surfaces of the first seat panel portion 48, which bends from the lower end of the first vertical wall portion 47 toward the outdoor side and has part of it protruding left and right from the upright 4, are regulated in relation to the vertical positions of the upper and lower end surfaces of the glass panel 6 and the spandrel panel 7.

[0161] Specifically, for the first bracket 22a arranged in a position that overlaps with the transom 5a in the vertical direction, the upper surface of the first seat plate portion 48 is arranged below the lower end surface of the spandrel panel 7, the lower edge of which is held by the transom 5a, and the lower surface of the first seat plate portion 48 is arranged above the upper end surface of the glass panel 6, the upper edge of which is held by the transom 5a. Also, for the first bracket 22a arranged in a position that overlaps with the transom 5b in the vertical direction, the upper surface of the first seat plate portion 48 is arranged below the lower end surface of the glass panel 6, the lower edge of which is held by the transom 5b, and the lower surface of the first seat plate portion 48 is arranged above the upper end surface of the spandrel panel 7, the upper edge of which is held by the transom 5b.

[0162] Therefore, when assembling the glass panel 6 and the spandrel panel 7, interference between the left and right ends of the glass panel 6 and the spandrel panel 7 and the first seat panel portion 48 extending left and right from the upright 4 can be prevented.

[0163] Furthermore, since the second seat panel portion 63 does not protrude left or right from the upright 4, there is no interference between the left or right ends of the glass panel 6 and the spandrel panel 7 and the second seat panel portion 63 when assembling the glass panel 6 and the spandrel panel 7.

[0164] As described above, in this example, of the brackets 22a, 22b, the first vertical wall portion 47 and the second vertical wall portion 62, which are fixed to the outdoor side of the upright 4, are designed not to protrude left or right from the upright 4, and the vertical positions of the upper and lower surfaces of the first seat panel portion 48, part of which protrudes left or right from the upright 4, are regulated in relation to the vertical positions of the upper and lower end surfaces of the glass panel 6 and the spandrel panel 7, so that the assembly work of the glass panel 6 and the spandrel panel 7 can be carried out without interference with the brackets 22a, 22b.

[0165] In this example, the stringers 21a, 21b are positioned so as to overlap the interlocks 5a, 5b in the out-of-plane direction, thereby minimizing the impact of the stringers 21a, 21b on the exterior design of the building 3. In addition, the stringers 21a, 21b can be made less visible from the interior space of the building 3.

[0166] Furthermore, among the multiple stringers 21a, 21b that make up the louver units 23a, 23b, the vertical plate portions 33 of the stringers 21a, 21b that are arranged in a position opposite the transverse plate portion 5b that holds the lower edge of the glass panel 6 in the out-of-plane direction are bent downward from the outdoor end of the horizontal plate portion 34, making the stringers 21a, 21b even more difficult to see from the indoor space of the building 3.

[0167] In this example, the ends of the stringers 21a, 21b on one side in the left-right direction are fixed to the brackets 22a, 22b so as to prevent relative left-right movement, and the ends of the stringers 21a, 21b on the other side in the left-right direction are fixed to the brackets 22a, 22b so as to allow relative left-right movement, thereby allowing thermal elongation of the stringers 21a, 21b. Furthermore, in order to fix the ends of the stringers 21a, 21b on the other side in the left-right direction to the brackets 22a, 22b so as to allow relative left-right movement, the second fixing holes 39 provided in the ends of the stringers 21a, 21b on the other side in the left-right direction are loose holes. This improves the workability of fixing the stringers 21a, 21b to the brackets 22a, 22b. Dimensional errors can also be accommodated.

[0168] Furthermore, of the main body portion 57 and the extension portion 58 that constitute the first bracket 22a, a gap 61 is provided between the left-right end face of the first stringer 21a fixed to the extension portion 58 and the left-right end face of the first stringer 21a fixed to the main body portion 57.This prevents the end faces of adjacent first stringers 21a in the left-right direction from interfering with each other even if thermal expansion occurs in the first stringer 21a.

[0169] Furthermore, according to this example, the workability of fixing the louvers 2 to the stringers 21a, 21b can be improved, and the first fastening members 24 can be prevented from falling off the stringers 21a, 21b.

[0170] That is, in this example, the vertical plate portions 33 that make up the stringers 21a, 21b are provided with notches 35 that allow the shaft portions 25 that make up the first fastening members 24 to be inserted therethrough, rather than through holes through which the shaft portions 25 that make up the first fastening members 24 can be inserted in the axial and vertical directions, and that open at the ends in the vertical direction. Therefore, when assembling the louver units 23a, 23b, by moving the stringers 21a, 21b in the longitudinal direction of the notches 35, the shaft portions 25 of the multiple bolts 27 that protrude from the insertion portions 31 of the louver 2 can be simultaneously inserted into the multiple notches 35. This improves the workability of fixing the louvers 2 to the stringers 21a, 21b.

[0171] The vertical plate portion 33 is provided with an engagement portion 36 that can be engaged with at least a part of the first fastening member 24 in the vertical direction at the other end where the cutout 35 is opened. Therefore, the part of the first fastening member 24 engages with the engagement portion 36 in the vertical direction, thereby preventing the shaft portion 25 from slipping out of the cutout 35. In this example, the washer 29 loosely fitted on the shaft portion 25 engages with the engagement portion 36, thereby preventing the shaft portion 25 from slipping out of the cutout 35.

[0172] Therefore, the first fastening members 24 can be prevented from falling off the stringers 21a, 21b when the louver units 23a, 23b are transported or when the louver units 23a, 23b are lifted by a crane. Also, even if the louver 2 and the curtain wall 1 are displaced relative to each other in the vertical direction during an earthquake or other event, the washer 29 and the engaging portion 36 engage with each other, preventing the shaft portion 25 from slipping out of the notch 35, thereby preventing the louver 2 from falling off.

[0173] The effect of preventing the first fastening member 24 from falling off the stringers 21a, 21b is not limited to when the engagement portion 36 is provided at the upper end of the vertical plate portion 33, but is similarly obtained when the engagement portion 36 is provided at the lower end of the vertical plate portion 33.

[0174] In this example, the washer 29 can engage with the engaging portion 36 not only in the vertical direction but also in the axial direction of the shaft portion 25. This effectively prevents the washer 29 from disengaging from the engaging portion 36. This effectively prevents the first fastening member 24 from falling off the stringers 21a, 21b.

[0175] In this example, since the engaging portion 36 is provided on the hook portion 37, it is possible to simplify the structure for providing the engaging portion 36 on the vertical plate portion 33. In addition, it is also possible to minimize the increase in weight caused by providing the engaging portion 36 on the vertical plate portion 33.

[0176] In this example, the louver 2 is provided with a storage portion 30 that can store the head 26 of the bolt 27 so that it cannot rotate, and a slit-shaped insertion portion 31 through which the shaft 25 of the bolt 27 can be inserted, so that the position of the bolt 27, i.e., the connection position of the louver 2 by the stringers 21a, 21b, can be freely set. Furthermore, the work of fixing the stringers 21a, 21b to the louver 2 can be done simply by loosely fitting a washer 29 onto the tip of the shaft 25 and screwing in a nut 28, improving the workability of fixing the louver 2 to the stringers 21a, 21b.

[0177] In this example, the louver 2 is provided with fall prevention parts 40 that can vertically engage with the upper ends of the vertical plate parts 33 of the stringers 21a and 21b. Therefore, even if the bolts 27 and nuts 28 that make up the first fastening members 24 loosen, the fall prevention parts 40 provided on the louver 2 can vertically engage with the upper ends of the vertical plate parts 33, preventing the louver 2 from falling.

[0178] Furthermore, in this example, the fall prevention part 40 has a crank-shaped end face shape and can also engage with the upper end of the vertical plate part 33 in the axial direction of the shaft part 25, effectively preventing the fall prevention part 40 from disengaging from the upper end of the vertical plate part 33. Therefore, the louver 2 can be effectively prevented from falling. [Explanation of symbols]

[0179] 1. Curtain wall 2 Louvers 3 Building 4 mullions 5a, 5b no eyes 6 Glass Panels 7 Spandrel Panels 8 Mounting Brackets 9 skeleton 10 Prismatic section 11 Flat plate part 12 Connecting plate part 13a, 13b Panel insertion groove 14a, 14b rim 15 spacer 17 Sealant 18a, 18b rim 19a, 19b Pressed edge 20 Cover 21a, 21b Stringer 22a, 22b bracket 23a, 23b Louver unit 24 First fastening member 25 Shaft 26 Head 27 volts 28 Nut 29 Washer 30 Storage section 31 Insertion part 32 Indoor wall 33 Vertical plate section 34 Horizontal plate part 35 Cutout 36 Engagement part 37 Hook part 37a Base 37b Bulge 37c Return 37d slope 38 1st fixing hole 39 2nd fixing hole 40 Fall prevention part 41 Second fastening member 42 Shaft 43 Head 44 volts 45 Nut 46 Washer 47 First vertical wall 48 1st seat plate part 49 Third fastening member 50 1st hole 51 Through hole 52 Shaft 53 Head 54 volts 55 Nut 56 Washer 57 Main body 58 Overhang 59 3rd fixing hole 60 4th fixing hole 61 Gap 62 Second vertical wall 63 2nd seat plate part 64 2nd hole 65 5th fixing hole 66 Drain hole

Claims

1. A decorative material fixing structure for fixing a decorative material to the outdoor side of a curtain wall having a plurality of mullions, a plurality of mullions, and a plurality of panels, The wall-side fittings are fixed to each of a pair of the uprights adjacent to each other in the left-right direction, and a decorative material-side fitting is arranged with its longitudinal direction facing the left-right direction and fixed to the decorative material, The wall-side fitting is arranged at a position where it overlaps with the transom in the vertical direction, and has a standing wall portion that does not protrude from the upright in the left-right direction and is fixed to the outdoor side of the upright, and a base plate portion that bends from the lower end of the standing wall portion toward the outdoor side and has a part that protrudes from the upright in the left-right direction, The upper surface of the seat panel is positioned below the lower end surface of the panel whose lower edge is held by the interlock, and the lower surface of the seat panel is positioned above the upper end surface of the panel whose upper edge is held by the interlock, The decorative material-side fitting has an end portion on one side in the left-right direction fixed to the seat plate portion of the wall-side fitting fixed to the upright on one side of the pair of uprights in the left-right direction, and an end portion on the other side in the left-right direction fixed to the seat plate portion of the wall-side fitting fixed to the upright on the other side of the pair of uprights in the left-right direction. Fixing structure for decorative materials.

2. One of the end portions on one side in the left-right direction and the other side in the left-right direction of the decorative material-side fitting is fixed so as to prevent relative movement in the left-right direction, and the other of the end portions on one side in the left-right direction and the other side in the left-right direction is fixed so as to allow relative movement in the left-right direction. A decorative material fixing structure according to claim 1.

3. The seat plate portion has a main body portion arranged at a portion overlapping the upright in the out-of-plane direction, and a protruding portion protruding in the left-right direction from the upright, The decorative material-side fitting has an end portion on one side in the left-right direction fixed to one of the main body portion and the protruding portion of the wall-side fitting fixed to the upright on one side in the left-right direction, and an end portion on the other side in the left-right direction fixed to the other of the main body portion and the protruding portion of the wall-side fitting fixed to the upright on the other side in the left-right direction. A decorative material fixing structure according to claim 1.

4. the decorative material-side fitting has a first fixing hole at one end in the left-right direction and a second fixing hole at the other end in the left-right direction, the wall-side fitting has a third fixing hole in the main body portion and a fourth fixing hole in the protruding portion, any one of the first fixing hole, the second fixing hole, the third fixing hole, and the fourth fixing hole is a loose hole that allows relative movement in the left-right direction between the left-right end portion of the decorative material-side fitting and the wall-side fitting; The decorative material fixing structure according to claim 3.

5. The decorative material fixing structure according to claim 4 , wherein the first fixing hole or the second fixing hole is the loose hole.

6. The decorative material is a louver arranged with its longitudinal direction facing the up-down direction, and a plurality of the decorative material is fixed to the decorative material-side fittings at intervals in the left-right direction, The decorative material-side metal fitting is a stringer that connects the plurality of louvers. A decorative material fixing structure according to claim 1.

7. A method for constructing an exterior wall having the decorative material fixing structure according to any one of claims 1 to 6, One vertical edge of the panel is inserted into the panel insertion groove provided on one of the pair of mullions, each of which has the wall fitting fixed to its exterior side, and then the panel is rotated around the one vertical edge of the panel, so that the other vertical edge of the panel passes between the underside of the seat plate portion of the wall fitting, which is positioned so that it overlaps in the vertical direction with the crossbeam that holds the top edge of the panel, and the upper surface of the seat plate portion of the wall fitting, which is positioned so that it overlaps in the vertical direction with the crossbeam that holds the bottom edge of the panel, and is inserted into the panel insertion groove provided on the other of the pair of mullions, thereby assembling the panel between the pair of mullions. The left and right ends of the decorative material-side fittings fixed to the decorative material are fixed to the seat plate portions of the wall-side fittings fixed to the pair of uprights, How to construct exterior walls.

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