Exterior facing substrate structure and exterior facing substrate unit

Abstract

To improve workability while preventing lateral buckling of a vertical furring strip.SOLUTION: An exterior facing substructure comprises upper and lower outer peripheral beams 20 that are stretched between a pair of adjacent outer peripheral columns 40, a plurality of vertical furring strips 90 that are supported by the upper and lower outer peripheral beams 20 and support an exterior facing material 60 that is arranged on an exterior side, a lateral tie 94 that is supported by the upper and lower outer peripheral beams 20 and is structurally disconnected from the outer peripheral columns 40, and that is stretched between the adjacent vertical furring strips 90, and a brace 110 that is provided in the lateral tie 94 and is stretched between the adjacent vertical furring strips 90.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to an exterior base structure and an exterior base unit. [Background technology]

[0002] An exterior wall renovation structure is known in which multiple horizontal furring strips are attached to a new lattice-shaped base installed on the outside of an existing exterior wall, and new exterior materials are then attached to these horizontal furring strips (see, for example, Patent Document 1).

[0003] Also, an exterior wall renovation structure is known in which an exterior wall panel for renovation is attached to the outside of two vertical furring strips (metal furring strips) that are attached to an existing wall and have a pair of diagonal members hung across them (see, for example, Patent Document 2).

[0004] Furthermore, a frame structure is known that comprises a first row of vertical frame members, a second row of vertical frame members, and a plurality of horizontal beam members connecting the first row of vertical frame members and the second row of vertical frame members (see, for example, Patent Document 3). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2001-329676 A [Patent Document 2] JP 2007-177432 A [Patent Document 3] JP 2012-241358 A Summary of the Invention [Problem to be solved by the invention]

[0006] However, when wind load (wind pressure) acts from the inside of the room on an exterior material such as an exterior wall that is attached to the outside of the room by vertical furring strips, the compressed side (inside of the room) of the vertical furring strip may bulge in the width direction of the exterior material, causing it to buckle laterally.

[0007] As a countermeasure to this, for example, it is possible to provide wind-resistant beams on the outer peripheral frame supporting the vertical furring strips and use these wind-resistant beams to support the vertical furring strips.

[0008] However, since wind-resistant beams need to be spanned between the outer perimeter columns of the outer perimeter frame, their construction is time-consuming.

[0009] In consideration of the above-mentioned facts, the present invention aims to suppress lateral buckling of vertical furring strips while improving workability. [Means for solving the problem]

[0010] The exterior base structure described in claim 1 comprises upper and lower perimeter beams spanning a pair of adjacent perimeter columns, a plurality of vertical furring strips supported by the upper and lower perimeter beams and supporting exterior material placed on the outside of the room, horizontal tie members spanning adjacent vertical furring strips between the upper and lower perimeter beams and structurally disconnected from the perimeter columns, and braces provided at least above and below the horizontal tie members and spanning adjacent vertical furring strips.

[0011] According to the exterior base structure of claim 1, upper and lower perimeter beams are spanned between a pair of adjacent perimeter columns. A plurality of vertical furring strips are supported between these upper and lower perimeter beams. The multiple vertical furring strips support exterior materials that are placed on the outside of the room. Furthermore, horizontal ties are spanned between the upper and lower perimeter beams and adjacent vertical furring strips. The horizontal ties are structurally disconnected from the pair of perimeter columns. Furthermore, a brace is provided on at least one of the upper and lower sides of the horizontal ties. The brace is spanned between adjacent vertical furring strips.

[0012] Here, when wind load (wind pressure) acts from the inside of the room on the exterior material placed on the outside of the vertical furring strip, the compression side (inside of the room) of the vertical furring strip supporting the exterior material may bulge in the width direction of the exterior material, causing it to buckle laterally.

[0013] In contrast, in the present invention, as described above, horizontal ties are placed across adjacent vertical furring strips. These horizontal ties shorten the buckling length of adjacent vertical furring strips. Furthermore, braces are provided on at least one of the top and bottom of the horizontal ties to span adjacent vertical furring strips. These braces increase the in-plane rigidity of the frame-shaped portion formed by the adjacent vertical furring strips and horizontal ties.

[0014] This prevents the vertical furring strips from moving in the width direction of the exterior material. Therefore, when wind load (wind pressure) acts on the exterior material from inside the room, the compressed side of the vertical furring strips is prevented from bulging out in the width direction of the exterior material, which causes lateral buckling.

[0015] In addition, the horizontal tie member is structurally separated from the pair of perimeter columns. In other words, the horizontal tie member of the present invention does not need to span the pair of perimeter columns like a wind-resistant beam. Therefore, the workability of the horizontal tie member is improved.

[0016] In this way, the present invention makes it possible to suppress lateral buckling of the vertical furring strips while improving workability.

[0017] The exterior base structure described in claim 2 is the exterior base structure described in claim 1, which comprises upper and lower cross members that are supported on the upper and lower outer perimeter beams on the outside of the room, and the multiple vertical furring strips are spanned across the upper and lower cross members, and the braces are provided on an upper frame-shaped portion formed by adjacent vertical furring strips, the upper cross member, and the horizontal connecting member, and on a lower frame-shaped portion formed by adjacent vertical furring strips, the lower cross member, and the horizontal connecting member, respectively.

[0018] According to the exterior foundation structure of claim 2, the upper and lower cross members are supported by the upper and lower perimeter beams on the exterior side of the upper and lower perimeter beams. A plurality of vertical furring strips are spanned between the upper and lower cross members.

[0019] Here, the braces are provided on the upper frame-shaped portion formed by adjacent vertical furring strips, upper cross members, and cross connecting members, and on the lower frame-shaped portion formed by adjacent vertical furring strips, lower cross members, and cross connecting members.

[0020] This further prevents the vertical furring strips from moving in the width direction of the exterior material, and therefore further prevents the compressed side of the vertical furring strips from bulging out in the width direction of the exterior material when wind load (wind pressure) acts on the exterior material from inside the room.

[0021] The exterior base unit described in claim 3 comprises a pair of horizontal members arranged at a distance from each other, a plurality of vertical furring strips that are spanned across the pair of horizontal members and support the exterior material, horizontal tie members that are spanned between adjacent vertical furring strips between the pair of horizontal members, and braces provided in a frame-shaped portion formed by adjacent vertical furring strips, the horizontal members, and the horizontal tie members.

[0022] According to the exterior base unit of claim 3, a pair of horizontal members are arranged with a gap between them. A plurality of vertical furring strips that support the exterior material are spanned between the pair of horizontal members. A horizontal tie member is spanned between adjacent vertical furring strips. Furthermore, a brace is provided in the frame-shaped portion formed by adjacent vertical furring strips, horizontal members, and horizontal tie members.

[0023] Here, when wind load (wind pressure) acts from the inside of the room on the exterior material placed on the outside of the vertical furring strip, the compression side (inside of the room) of the vertical furring strip supporting the exterior material may bulge in the width direction of the exterior material, causing it to buckle laterally.

[0024] In contrast, in the present invention, as described above, horizontal ties are placed across adjacent vertical furring strips. These horizontal ties shorten the buckling length of adjacent vertical furring strips. Furthermore, braces are provided in the frame-shaped portion formed by adjacent vertical furring strips, horizontal members, and horizontal ties. These braces increase the in-plane rigidity of the frame-shaped portion.

[0025] This prevents the vertical furring strips from moving in the width direction of the exterior material. Therefore, when wind load (wind pressure) acts on the exterior material from inside the room, the compressed side of the vertical furring strips is prevented from bulging out in the width direction of the exterior material, which causes lateral buckling.

[0026] In addition, the horizontal tie of the present invention is bridged between adjacent vertical furring strips, and is not bridged between a pair of perimeter columns like a wind-resistant beam. Therefore, the workability of the horizontal tie is improved.

[0027] In this way, the present invention makes it possible to suppress lateral buckling of the vertical furring strips while improving workability.

[0028] Furthermore, in the present invention, the workability is further improved by unitizing a pair of horizontal members, a plurality of vertical furring strips, horizontal tie members, and braces into a unit (exterior base unit). Effect of the Invention

[0029] As described above, according to the present invention, it is possible to suppress lateral buckling of vertical furring strips while improving workability. [Brief description of the drawings]

[0030] [Figure 1] 1 is a plan view showing the outer periphery of a structure to which an exterior base structure according to one embodiment is applied. [Diagram 2] 2 is an elevational view of the exterior foundation unit shown in FIG. 1 as viewed from the outside of the room. [Diagram 3] 3 is a cross-sectional view taken along line 3-3 of FIG. 1. [Figure 4] FIG. 3 is a partially enlarged elevational view of FIG. 2. [Diagram 5] 5 is a cross-sectional view taken along line 5-5 of FIG. 4. [Figure 6] 6 is a cross-sectional view corresponding to FIG. 5, showing a modified example of the exterior base structure according to one embodiment. [Figure 7] 4 is a cross-sectional view corresponding to FIG. 3 and showing a modified example of the exterior base structure according to one embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0031] Hereinafter, one embodiment will be described with reference to the drawings.

[0032] (Exterior base structure) 1 shows the outer periphery of a structure (building) 10 to which the exterior foundation structure according to this embodiment is applied. The structure 10 is made up of multiple floors. The structure 10 includes a periphery beam 20, a slab 50 (see FIG. 3), an exterior material 60, and an exterior foundation unit 70.

[0033] 1, the slab 50 is omitted. An arrow IN shown in each drawing indicates the indoor side of the structure 10, and an arrow OUT indicates the outdoor side of the structure 10.

[0034] (peripheral beam) The perimeter beams 20 are arranged along the outer periphery of the structure 10. As shown in Fig. 2, the perimeter beams 20 are spanned across a pair of outer periphery columns 40 arranged on the outer periphery of the structure 10 with a gap therebetween in the vertical direction.

[0035] The pair of perimeter columns 40 are arranged at a distance from each other on the perimeter of the structure 10. In addition, the pair of perimeter columns 40 are, as an example, steel columns (perimeter steel columns) formed from square steel pipes. The pair of perimeter columns 40 and the upper and lower perimeter beams 20 constitute a perimeter frame.

[0036] The outer perimeter columns 40 are not limited to square steel pipes, but may be made of round steel pipes or H-shaped steel. The outer perimeter columns 40 are not limited to steel frame construction, but may be made of reinforced concrete or steel-framed reinforced concrete.

[0037] 3, the perimeter beams 20 are, for example, steel beams (perimeter steel beams) formed of H-shaped steel. The perimeter beams 20 have an upper flange portion 22 and a lower flange portion 24 that face each other in the vertical direction, and a web portion 26 that connects the upper flange portion 22 and the lower flange portion 24.

[0038] A plurality of studs 28 are provided on the upper surface of the upper flange portion 22. The plurality of studs 28 are arranged at intervals in the beam width direction and material axis direction of the perimeter beam 20. The plurality of studs 28 also protrude upward from the upper surface of the upper flange portion 22 and are embedded in the slab 50. The perimeter beam 20 and the slab 50 are joined via these studs 28 so as to be able to transmit shear forces.

[0039] It is possible to appropriately omit the studs 28. Furthermore, the outer perimeter beams 20 are not limited to steel-frame construction, and may be made of reinforced concrete, steel-framed reinforced concrete, or the like.

[0040] 1 and 3, the perimeter beam 20 is provided with a number of brackets 30 that support cross members 72, which will be described later. The brackets 30 are arranged at intervals in the material axial direction of the perimeter beam 20 and protrude from the perimeter beam 20 to the outside (arrow OUT side). Each bracket 30 is formed in a T-shape when viewed from the outside.

[0041] 3, the bracket 30 has a base plate 32 that receives the cross member 72, and a support plate 36 that supports the base plate 32 from below. The base plate 32 protrudes from the end of the upper flange portion 22 of the perimeter beam 20 along the underside of the slab 50 to the outside of the room.

[0042] 1, a base fastener 34 is provided on the tip side of the upper surface of the base plate 32. The base fastener 34 protrudes upward from the upper surface of the support plate 36. The base fastener 34 is disposed with its thickness direction aligned with the material axis of the perimeter beam 20. A mounting fastener 74 of a cross member 72, which will be described later, is bolted to the base fastener 34.

[0043] 3, the support plate 36 is disposed below the base plate 32. The support plate 36 is disposed with its thickness direction aligned with the material axis direction of the perimeter beam 20. The support plate 36 is provided in the form of a rib on the exterior surface of the web portion 26 of the perimeter beam 20 on the outdoor side.

[0044] The support plate 36 is provided across the upper flange portion 22 and the lower flange portion 24 of the outer perimeter beam 20, and is joined to the upper flange portion 22, the lower flange portion 24, and the web portion 26 by welding or the like. In addition, the upper end portion of the support plate 36 is joined to the lower surface of the base plate 32 by welding or the like.

[0045] In this embodiment, a rib plate 38 is provided on the opposite side of the support plate 36 to the web portion 26 of the outer perimeter beam 20. However, the rib plate 38 can be omitted as appropriate.

[0046] (Slab) The slab 50 is made of reinforced concrete and has multiple slab reinforcements 52 buried inside. The slab 50 is also installed on the perimeter beam 20 and an internal beam (not shown) adjacent to the perimeter beam 20. The slab 50 has a protruding portion 50A that protrudes beyond the perimeter beam 20 toward the outside of the room.

[0047] The protruding portion 50A is formed by pouring concrete on a slab deck (not shown) that is installed on the outer perimeter beams 20 and cross members 72 (described later). An exterior material 60 is arranged on the outdoor side of the protruding portion 50A.

[0048] (Exterior materials) The exterior material (exterior panel) 60 is formed, for example, from an ALC panel or the like, and forms the exterior wall of the structure 10. The exterior material 60 is disposed on the outdoor side of the perimeter beam 20, facing the side of the perimeter beam 20. The exterior material 60 is supported by a plurality of brackets 30 provided on the perimeter beam 20 via an exterior base unit 70.

[0049] (Exterior base unit) 2, the exterior foundation unit 70 has upper and lower horizontal members 72, a plurality of vertical furring strips 90, a plurality of horizontal tie members 94, and a plurality of braces 110. The upper and lower horizontal members 72, the plurality of vertical furring strips 90, the plurality of horizontal tie members 94, and the plurality of braces 110 are erected in a pre-integrated state, for example, by ground assembly or the like. After erecting the exterior foundation unit 70, the exterior material 60 is attached to the outdoor side of the plurality of vertical furring strips 90.

[0050] (cross beam) 1, the upper and lower cross members 72 support multiple vertical furring strips 90 while being bridged across adjacent brackets 30. In other words, the multiple vertical furring strips 90 are supported by the upper and lower perimeter beams 20 via the upper and lower cross members 72 and multiple brackets 30.

[0051] As shown in Fig. 2, the upper and lower cross members 72 are disposed outside the room relative to the upper and lower peripheral beams 20. More specifically, the upper and lower cross members 72 are disposed outside the room relative to the upper and lower peripheral beams 20. The upper and lower cross members 72 are also disposed along the width direction (arrow W direction) of the exterior foundation unit 70 (exterior material 60). These cross members 72 are disposed at intervals in the height direction (vertical width direction) of the exterior foundation unit 70 (exterior material 60).

[0052] 3, the horizontal member 72 is formed of an H-shaped steel, for example. The horizontal member 72 has a pair of flange portions 72A, 72B facing each other in the thickness direction of the exterior base unit 70 (exterior material 60), and a web portion 72C connecting the pair of flange portions 72A, 72B.

[0053] 1, a cross member 72 is placed on the base plate 32 of an adjacent bracket 30. This cross member 72 is provided with a plurality of mounting fasteners 74. The mounting fasteners 74 are formed from a steel plate or the like, and are arranged at intervals in the longitudinal direction of the cross member 72. The mounting fasteners 74 are also arranged with their thickness direction being the longitudinal direction of the cross member 72.

[0054] The mounting fastener 74 extends toward the interior side (the side indicated by the arrow IN) from the cross member 72. The mounting fastener 74 is joined to the base fastener 34 of the bracket 30 by a bolt 76 and a nut 78 in a state where the mounting fastener 74 is overlapped with the base fastener 34 of the bracket 30.

[0055] 3, the flange portion 72B on the indoor side of the cross member 72 is disposed along the end face on the outdoor side of the slab 50. This cross member 72 functions as a concrete flow stopper when the slab 50 is constructed. In other words, the cross member 72 serves both as a support member that supports the vertical furring strips 90 and as a concrete flow stopper for the slab 50.

[0056] 2, the cross member 72 is provided with a plurality of vertical furring strip flanges 80. The vertical furring strip flanges 80 are formed from steel plates or the like, and are arranged at intervals in the longitudinal direction of the cross member 72. The vertical furring strip flanges 80 are also arranged with their thickness direction aligned with the longitudinal direction of the cross member 72.

[0057] As shown in Fig. 3, the vertical furring strip flanges 80 are joined in a state where they intersect (approximately perpendicular to) the cross members 72, and extend from the cross members 72 to both sides in the vertical width direction of the exterior base unit 70 (exterior material 60). The vertical furring strip flanges 80 are joined to the vertical furring strips 90 by bolts 82 and nuts 84 (see Fig. 1) with the ends of the vertical furring strips 90 overlapping each other.

[0058] (Vertical furring strip) As shown in Fig. 1, the multiple vertical furring strips 90 are base materials that support the exterior material 60. As an example, each vertical furring strip 90 has a pair of lip channel steels 90A joined back-to-back, and is arranged along the vertical width direction of the exterior base unit 70 (exterior material 60).

[0059] The vertical furring strips 90 are spaced apart in the width direction of the exterior base unit 70 (exterior material 60). The exterior material 60 is attached to the exterior side of the vertical furring strips 90 with screws (not shown) or the like.

[0060] In addition, the vertical furring strip 90 is not limited to a pair of lip channel steel 90A, but may be formed by a single lip channel steel 90A, or may be formed by other shaped steel, etc.

[0061] 2, the multiple vertical furring strips 90 are disposed between the upper and lower cross members 72. The upper and lower ends of each vertical furring strip 90 are bolted to the vertical furring strip flanges 80 provided on the upper and lower cross members 72, respectively, as described above.

[0062] (Horizontal tie material) 2 and 4, the horizontal tie members 94 are bridged between the upper and lower horizontal members 72 (periphery beams 20) and adjacent vertical furring strips 90 when viewed in the thickness direction of the exterior base unit 70 (exterior material 60). As an example, the horizontal tie members 94 are formed of channel steel and are arranged with their openings facing down. The horizontal tie members 94 also connect the longitudinal centers of adjacent vertical furring strips 90.

[0063] Specifically, as shown in Fig. 5, a gusset plate 92 is provided at the center in the longitudinal direction of adjacent vertical furring strips 90. The gusset plate 92 is formed from a steel plate or the like, and is arranged with its thickness direction being the longitudinal direction of the vertical furring strip 90. The gusset plates 92 protrude from adjacent vertical furring strips 90 toward each other, and are joined by bolts 96 and nuts in a state where they are overlapped on the upper surfaces of the horizontal connecting materials 94.

[0064] The horizontal tie members 94 are structurally separated from the pair of outer periphery columns 40. In other words, the horizontal tie members 94 are not bridged across the pair of outer periphery columns 40 and are not joined to the pair of outer periphery columns 40. The gusset plates 92 and the horizontal tie members 94 may be joined by means of, for example, welding, without being limited to the bolts 96 and nuts. The joining structure between the horizontal tie members 94 and the vertical furring strips 90 is not limited to the gusset plates 92 and can be changed as appropriate.

[0065] As shown in FIGS. 2 and 4, at the top of the exterior base unit 70, a plurality of upper frame-shaped portions 100U are formed by adjacent vertical furring strips 90, upper horizontal members 72, and horizontal tie members 94.

[0066] Meanwhile, in the lower part of the exterior foundation unit 70, a plurality of lower frame-shaped portions 100L are formed by adjacent vertical furring strips 90, the lower horizontal members 72, and the horizontal tie members 94. The plurality of upper frame-shaped portions 100U and lower frame-shaped portions 100L arranged on both sides of the exterior foundation unit 70 in the width direction are reinforced by a pair of braces 110.

[0067] The upper frame portion 100U and the lower frame portion 100L are an example of a frame portion.

[0068] (Brace) As an example, the pair of braces 110 are X-shaped braces arranged in an X-shape. As an example, each brace 110 is a turnbuckle brace. This brace 110 has a pair of rods 112, a turnbuckle 114 that connects one ends of the pair of rods 112, and shuttlecocks 116 provided on the other ends of the pair.

[0069] Male threads are provided at one end of the pair of rods 112. The one ends of the pair of rods 112 are screwed into bolt holes formed on both sides of the turnbuckle 114. The male threads of the pair of rods 112 are reverse-threaded. This makes it possible to adjust the tension of the pair of rods 112 by rotating the turnbuckle 114 relative to the pair of rods 112.

[0070] The braces 110 are arranged along the diagonal of the upper frame portion 100U or the lower frame portion 100L. The shuttlecocks 116 of each brace 110 are overlapped on the indoor side (opposite side from the exterior material 60) of the vertical furring strips 90 and joined by welding, bolts, or the like.

[0071] The brace 110 is not limited to being joined to the indoor surface of the vertical furring strip 90, but may be joined, for example, to the outdoor surface or side surface of the vertical furring strip 90. Also, the brace 110 is not limited to being joined to the vertical furring strip 90, but may be joined to the horizontal member 72 or the horizontal tie member 94.

[0072] (action) Next, the operation of this embodiment will be described.

[0073] As shown in Figures 1 and 2, in this embodiment, upper and lower perimeter beams 20 are spanned between a pair of adjacent perimeter columns 40. An exterior foundation unit 70 is disposed on the outdoor side of the upper and lower perimeter beams 20. The exterior foundation unit 70 is supported by the upper and lower perimeter beams 20 via multiple brackets 30, respectively.

[0074] Specifically, the exterior foundation unit 70 has upper and lower cross members 72 that are arranged outside the room relative to the upper and lower perimeter beams 20. The upper and lower cross members 72 are supported by the upper and lower perimeter beams 20 via a plurality of brackets 30, respectively.

[0075] A plurality of vertical furring strips 90 are spanned between the upper and lower cross members 72. The plurality of vertical furring strips 90 support the exterior material 60 arranged on the outside of the room. In addition, horizontal tie members 94 are spanned between the upper and lower cross members 72 (upper and lower perimeter beams) between adjacent vertical furring strips 90. The horizontal tie members 94 are structurally separated from a pair of perimeter columns 40.

[0076] Here, as shown by arrow R in Figure 3, when wind load (wind pressure) acts from the inside of the room on the exterior material 60 arranged on the outdoor side of the vertical furring strip 90, the compression side (indoor side) of the vertical furring strip 90 supporting the exterior material 60 may bulge in the width direction of the exterior material 60 (direction of arrow W in Figure 2) and undergo lateral buckling.

[0077] 2 and 3, adjacent vertical furring strips 90 are connected by horizontal ties 94. The horizontal ties 94 shorten the buckling length of adjacent vertical furring strips 90 in lateral buckling.

[0078] Additionally, the upper portion of the exterior base unit 70 is provided with a plurality of upper frame-shaped portions 100U formed by adjacent vertical furring strips 90, upper horizontal members 72, and horizontal ties 94. Meanwhile, the lower portion of the exterior base unit 70 is provided with a plurality of lower frame-shaped portions 100L formed by adjacent vertical furring strips 90, lower horizontal members 72, and horizontal ties 94.

[0079] The upper frame portions 100U and the lower frame portions 100L located on both sides of the exterior foundation unit 70 in the width direction are each reinforced by a pair of X-shaped braces 110. These braces 110 increase the in-plane rigidity of the upper frame portions 100U and the lower frame portions 100L located on both sides of the exterior foundation unit 70 in the width direction.

[0080] This prevents the vertical furring strips 90 from moving in the width direction of the exterior material 60. Therefore, when a wind load (wind pressure) acts on the exterior material 60 from the inside of the room, lateral buckling, in which the compressed side of the vertical furring strips 90 bulges out in the width direction of the exterior material 60, is prevented.

[0081] In addition, the horizontal tie material 94 is structurally separated from the pair of outer periphery columns 40. In other words, the horizontal tie material 94 of this embodiment does not need to span the pair of outer periphery columns 40 like a wind-resistant beam. Therefore, the workability of the horizontal tie material 94 is improved.

[0082] In this manner, in this embodiment, lateral buckling of the vertical furring strips 90 can be suppressed while improving workability.

[0083] Furthermore, in this embodiment, the pair of cross members 72, the multiple vertical furring strips 90, the multiple horizontal tie members 94, and the multiple braces 110 are unitized (exterior base unit 70), thereby further improving workability.

[0084] In this embodiment, as described above, the upper frame portions 100U and the lower frame portions 100L located on both sides in the width direction of the exterior foundation unit 70 are each reinforced by a pair of X-shaped braces 110. These braces 110 increase the in-plane rigidity of the exterior foundation unit 70 on both sides in the width direction, thereby efficiently increasing the in-plane rigidity of the entire exterior foundation unit 70.

[0085] Therefore, compared to the case where all of the upper frame portions 100U and lower frame portions 100L are reinforced with a pair of braces 110, the number of braces 110 can be reduced while efficiently suppressing lateral buckling of the vertical furring strips 90.

[0086] (Modification) Next, a modification of the above embodiment will be described.

[0087] In the above embodiment, a pair of X-shaped braces 110 is provided on the multiple upper frame portions 100U and lower frame portions 100L located on both sides in the width direction of the exterior foundation unit 70. However, the arrangement and number of the pair of braces 110 can be changed as appropriate, and for example, a pair of braces 110 may be provided on the upper frame portion 100U and lower frame portion 100L located in the center of the exterior foundation unit 70 in the width direction.

[0088] The pair of braces 110 can be provided on at least one of the upper frame portion 100U and the lower frame portion 100L. Furthermore, the braces 110 are not limited to an X-shape, and may be, for example, a single-slope brace.

[0089] Furthermore, in the above embodiment, the brace 110 is a turnbuckle brace. However, the brace 110 is not limited to a turnbuckle brace, and may be, for example, a steel brace or the like.

[0090] Also, in the above embodiment, the horizontal tie material 94 is bridged across the center of the longitudinal direction of adjacent vertical furring strips 90. However, the horizontal tie material 94 only needs to be bridged across adjacent vertical furring strips 90 between the upper and lower cross members 72 (upper and lower perimeter beams 20), and may be bridged across the upper or lower parts of adjacent vertical furring strips 90, for example. Also, the number of horizontal tie materials 94 that are bridged across adjacent vertical furring strips 90 is not limited to one, and multiple horizontal tie materials 94 may be bridged across adjacent vertical furring strips 90.

[0091] Also, in the above embodiment, the horizontal tie material 94 is arranged between adjacent vertical furring strips 90. However, for example, as in the modified example shown in Fig. 6, the horizontal tie material 120 may be arranged on the indoor side (opposite the exterior material 60) of adjacent vertical furring strips 90. This allows one horizontal tie material 120 to span three or more vertical furring strips 90. Therefore, the number of horizontal tie materials 120 can be reduced.

[0092] In the above embodiment, the upper and lower horizontal members 72, the multiple vertical furring strips 90, the horizontal tie members 94, and the braces 110 are unitized (exterior base unit 70) by ground assembly, etc. However, the upper and lower horizontal members 72, the multiple vertical furring strips 90, the horizontal tie members 94, and the braces 110 can also be erected in order on site without being unitized.

[0093] In the above embodiment, the cross member 72 is formed of an H-shaped steel. However, the cross member is not limited to a channel steel. For example, in the modified example shown in Fig. 7, the cross member 130 is formed of a channel steel (C-shaped steel).

[0094] The cross member 130 has a pair of upper flange portions 130A and lower flange portions 130B that face each other in the longitudinal direction of the vertical furring strip 90, and a web portion 130C that connects the pair of upper flange portions 130A and lower flange portions 130B.

[0095] The web portion 130C of the cross member 130 is disposed along the end face on the exterior side of the slab 50. This cross member 130 functions as a concrete flow stopper when the slab 50 is constructed. In other words, the cross member 130 serves both as a support member that supports the vertical furring strips 90 and as a concrete flow stopper member for the slab 50.

[0096] The cross member 130 is provided with a plurality of vertical furring strip flanges 140. The vertical furring strip flanges 140 are formed of steel plates or the like, and are arranged at intervals in the longitudinal direction of the cross member 130. The vertical furring strip flanges 140 are also arranged with their thickness direction aligned with the longitudinal direction of the cross member 130.

[0097] The vertical furring strip flange 140 is joined in an intersecting (approximately perpendicular) state to the cross member 130, and its upper and lower ends extend from the cross member 130 to both sides in the vertical width direction of the exterior base unit 70 (exterior material 60).

[0098] Specifically, a pair of slits are formed in the vertical furring flange 140. With the upper flange portion 130A and the lower flange portion 130B of the cross member 130 inserted into this pair of slits, the vertical furring flange 140 and the cross member 130 are joined by welding or the like. The upper and lower ends of the vertical furring flange 140 are joined by bolts 82 and nuts (not shown) with the ends of the vertical furring strips 90 overlapping each other.

[0099] In this way, the configuration of the cross member can be appropriately changed. Also, the cross member may be formed of, for example, L-shaped steel, steel pipe steel, or the like.

[0100] In the above embodiment, the vertical furring strips 90 are supported on the upper and lower perimeter beams 20 via the upper and lower cross members 72. However, the upper and lower cross members 72 may be provided as necessary and may be omitted as appropriate. When the upper and lower cross members 72 are omitted, for example, the vertical furring strips 90 are attached to gusset plates or the like that protrude from the upper and lower perimeter beams 20 to the outside of the room.

[0101] Although one embodiment of the present invention has been described above, the present invention is not limited to such an embodiment, and one embodiment and various modified examples may be used in appropriate combination, and it is of course possible to implement the present invention in various forms without departing from the gist of the present invention. [Explanation of symbols]

[0102] 20 Perimeter beam 40 Periphery pillar 60 Exterior Materials 70 Exterior base unit 72 Cross member 90 Vertical furring strip 92 Gusset plate 94 Horizontal tie material 100L Lower frame 100U upper frame part 110 Brace 130 Cross beam

Claims

1. Upper and lower perimeter beams are spanned between adjacent pairs of perimeter columns; A plurality of vertical furring strips that are supported by the upper and lower outer perimeter beams and support exterior materials arranged on the outside of the room; A horizontal tie member is disposed between the adjacent vertical furring strips between the upper and lower outer perimeter beams and is structurally separated from the outer perimeter column; A brace is provided at least on one side of the horizontal tie member and is spanned across adjacent vertical furring strips; An exterior base structure equipped with:

2. The upper and lower perimeter beams are provided on the outer side of the room from the upper and lower perimeter beams, and upper and lower cross members are supported by the perimeter beams, The plurality of vertical furring strips are spanned across the upper and lower cross members, The brace is provided on an upper frame-shaped portion formed by adjacent vertical furring strips, the upper horizontal member, and the horizontal tie member, and a lower frame-shaped portion formed by adjacent vertical furring strips, the lower horizontal member, and the horizontal tie member, respectively. The exterior base structure according to claim 1 .

3. A pair of cross members arranged at a distance from each other; A plurality of vertical furring strips that are spanned across the pair of cross members and support exterior materials; A horizontal tie member that is spanned between adjacent vertical furring strips between a pair of the horizontal members; A brace is provided in a frame-shaped portion formed by adjacent vertical furring strips, horizontal members, and horizontal tie members; An exterior base unit equipped with:

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