JP6892298B2 - Curtain wall unit - Google Patents

Description

The present invention relates to a curtain wall unit used for an outer wall of a building.

Conventionally, a curtain wall including a ceiling side sash, a floor side sash, a connecting member attached between the ceiling side sash and the floor side sash, and a vertical member bolted to the connecting member is known. The connecting member is sandwiched and fixed between the bottom surface of the ceiling side sash and the top surface of the floor side sash together with the vertical member, and forms an isobaric section together with the ceiling side sash and the floor side sash (see Patent Document 1).

JP-A-2014-177821

By the way, the lengths of the connecting member and the vertical member often include an error. When attaching the connecting member and vertical member between the ceiling side sash and the floor side sash, if there is an error in the length of the connecting member and vertical member, the pressure between the floor side sash and the connecting member and vertical member will be different. Unlike, either the connecting member or the vertical member may not be in perfect contact with the floor sash. If these are not completely adhered to each other, the water cannot be sufficiently stopped between the curtain wall and the skeleton, and there arises a problem that rainwater infiltrates between the curtain wall and the skeleton. Temporarily, a sealing material is provided between the ceiling side sash and the connecting member and the vertical member, and between the floor side sash and the connecting member and the vertical member in an attempt to prevent rainwater from entering between the curtain wall and the skeleton. Also, the pressure between either the connecting member or the vertical member and the floor side sash is different, and the pressure applied to the sealing material is also different. If the pressure applied to the sealing material is different, the sealing material cannot sufficiently stop water between the curtain wall and the skeleton, and rainwater infiltrates between the curtain wall and the skeleton as described above.

The present invention has been made in view of such a problem, and an object of the present invention is to obtain a curtain wall unit that prevents rainwater from entering between a curtain wall and a skeleton.

The curtain wall unit according to the first invention of the present application includes an upper frame, a pair of middle bones attached between both ends of the upper frame, a vertical frame attached to both ends of the upper frame, and a lower end portion and a middle bone of the vertical frame. The lower frame is attached to the side surface of the middle bone, and the pair of middle bones are combined with each other to form the first isobaric space portion. The first isobaric space portion is open to the outside, and the outside air can enter and exit the first isobaric space portion.

The upper frame has a vent and a fitting portion to which the lower frame of another curtain wall unit adjacent above the curtain wall unit is connected, and the upper frame and the lower frame of the other curtain wall unit are connected to each other. In the fitted state, a second isobaric space is formed between the fitting and the lower frame of the other curtain wall unit, and the second isobaric space communicates with the first isobaric space to ventilate. It is preferable that the mouth allows outside air to enter and exit the first isobaric space through the second isobaric space. As a result, the pressure inside the upper frame and the inside of the middle bone can be maintained at the same level as the outside air while the structure is such that the middle bone wins.

It is preferable to provide a sealing member provided between the lower frame and the middle bone. As a result, water can be stopped between the curtain wall and the skeleton.

It is preferable that the middle bone further includes a reinforcing material that regulates the movement of the middle bone in a direction perpendicular to the longitudinal direction of the middle bone. The reinforcing material is preferably provided at substantially the center of the middle bone in the longitudinal direction or near the lower end portion of the middle bone. This can prevent the middle bone from separating.

According to the present invention, there is provided a curtain wall unit that prevents rainwater from entering between the curtain wall and the skeleton.

It is the figure which looked at the curtain wall unit attached to a building from the outside. FIG. 5 is a cross-sectional view taken along the line II-II of FIG. FIG. 3 is a cross-sectional view taken along the line III-III of FIG. FIG. 5 is a cross-sectional view taken along the line IV-IV of FIG. It is sectional drawing in the VV line of FIG. It is a partial cross-sectional perspective view which shows the air flow from a vent to a hollow part.

100 Curtain wall unit 101 Upper right outer skin 102 Lower right outer skin 103 Upper left outer skin 104 Lower left outer skin 110 Upper frame 117 Fitting concave groove 119 Vent 120 Right vertical frame 130 Left vertical frame 140 Right middle bone 150 Left middle Bone 160 Right middle frame 170 Left middle frame 180 Lower right frame 190 Lower left frame 230 Upper reinforcement 240 Lower reinforcement 272 Sealer

The curtain wall unit 100 according to the embodiment according to the present invention will be described with reference to FIGS. 1 to 6.

Referring to FIG. 1, a plurality of curtain wall units 100 are attached to a building frame and used as an outer wall. Below, the length along the vertical direction when attached to the building is the height, the length parallel to the outer wall surface of the building and along the horizontal direction is the width, and the length perpendicular to the outer wall surface of the building and along the horizontal direction. The thickness is called thickness.

Referring to FIGS. 1 and 2, the curtain wall unit 100 forms an indoor side panel with an upper right outer skin 101, a lower right outer skin 102, an upper left outer skin 103, and a lower left outer skin 104 forming an outdoor panel. Upper right inner skin (not shown), upper left inner skin 106, upper frame 110, right vertical frame 120, left vertical frame 130, right middle bone 140, left middle bone 150, right middle frame 160 , A left intermediate frame 170, a lower right frame 180, and a lower left frame 190 are mainly provided. The right vertical frame 120, the left vertical frame 130, the upper frame 110, the lower right frame 180, and the lower left frame 190 form a frame body.

The upper right outer skin 101 and the upper left outer skin 103 are made of one flat plate-shaped float glass, and the lower right outer skin 102 and the lower left outer skin 104 are made of flat plate Low-E double glazing. The upper right inner skin and the upper left inner skin 106 are made of a flat plate-shaped fireproof panel. The upper right inner skin has the same shape as the upper left inner skin 106, and is provided on the indoor side of the upper right outer skin 101.

The upper frame 110, the right intermediate frame 160, the left intermediate frame 170, the lower right frame 180, and the lower left frame 190 have a substantially square bar shape and extend in the left-right direction, that is, in the width direction in FIG. The right middle frame 160, the left middle frame 170, the lower right frame 180, and the lower left frame 190 have substantially the same length in the width direction. The right vertical frame 120, the right middle bone 140, the left middle bone 150, and the left vertical frame 130 have a substantially square bar shape with one side surface open, and have substantially the same length in the height direction. At 1, it extends in the vertical direction, that is, in the height direction. The upper frame 110, the right middle frame 160, the left middle frame 170, the lower right frame 180, the lower left frame 190, the right vertical frame 120, the right middle bone 140, the left middle bone 150, and the left vertical frame 130 are made of an aluminum alloy. The upper frame 110, the lower right frame 180, and the lower left frame 190 are fixed to the frame of the building by using fastener members such as bolts and angle members (not shown). The right middle bone 140 and the left middle bone 150 are combined and fixed so that the openings face each other to form a middle bone which is a hollow rod body.

The right vertical frame 120 and the left vertical frame 130 are connected to both ends 111 and 112 of the upper frame 110 so as to extend vertically downward, and the right middle bone 140 and the left middle bone 150 are centered in the longitudinal direction of the bottom surface 113 of the upper frame 110. It is connected so as to extend vertically downward. More specifically, the upper ends 141 and 151 of the right middle bone 140 and the left middle bone 150 are connected at right angles to the bottom surface 113 of the upper frame 110. When these are attached to each other, the right vertical frame 120, the right middle bone 140, the left middle bone 150, and the left vertical frame 130 are parallel to each other.

The right intermediate frame 160 is provided between the right middle bone 140 and the right vertical frame 120, and the left intermediate frame 170 is provided between the left middle bone 150 and the left vertical frame 130. More specifically, one end of the right intermediate frame 160 is connected at right angles to the side surface 121 of the right vertical frame 120, and the other end is connected at right angles to the side surface 142 of the right middle bone 140. Similarly, one end of the left intermediate frame 170 is connected at right angles to the side surface 131 of the left vertical frame 130, and the other end is connected at right angles to the side surface 152 of the left middle bone 150. When these are attached to each other, the right middle bone 140 and the left middle bone 150, the right vertical frame 120, and the left vertical frame 130 are parallel to each other.

In the vicinity of the other end opposite to one end attached to the upper frame 110 of the right middle bone 140 and the left middle bone 150, the lower right frame 180 is provided between the right middle bone 140 and the right vertical frame 120, and is provided in the lower left. The frame 190 is provided between the left middle bone 150 and the left vertical frame 130. More specifically, one end of the lower right frame 180 is connected at right angles to the side surface 121 of the right vertical frame 120, and the other end is connected at right angles to the side surface 142 of the right middle bone 140. Similarly, one end of the lower left frame 190 is connected at right angles to the side surface 131 of the left vertical frame 130, and the other end is connected at right angles to the side surface 152 of the left middle bone 150. When these are attached to each other, the right middle bone 140 and the left middle bone 150, the lower right frame 180, and the lower left frame 190 are parallel to each other.

The upper frame 110 includes vents 119 provided near both ends. Details of the vent 119 will be described later.

An upper reinforcing member 230 and a lower reinforcing member 240, which are tubular members having a rectangular cross section, are provided between the right middle bone 140 and the left middle bone 150. The upper reinforcing member 230 is provided substantially in the center in the height direction from the right intermediate frame 160 and the left intermediate frame 170 to the lower right frame 180 and the lower left frame 190, and the lower reinforcing member 240 is the lower right frame when viewed from the horizontal direction. It is provided near the other end opposite to one end attached to the upper frame 110 of the right middle bone 140 and the left middle bone 150 so that a part of the 180 and the lower left frame 190 overlap each other.

Next, the joints of the upper frame 110, the right middle bone 140, the left middle bone 150, and the left lower frame 190 will be described with reference to FIGS. 3 to 6. 3 to 6 show joints of two curtain wall units 100 that are vertically adjacent to each other. In these figures, the right middle bone 140, the left middle bone 150, the left lower frame 190, and the lower reinforcing material 240 are provided on the upper curtain wall unit 100, and the upper frame 110 is provided on the lower curtain wall unit 100. Has been done.

Referring to FIG. 3, the upper frame 110 mainly includes an upper frame main body 114 and two plate-shaped portions 115 and 116. The two plate-shaped portions 115 and 116 form a fitting portion and project upward from the top surface of the upper frame main body 114 over the entire length in the longitudinal direction of the upper frame 110. A U-shaped fitting groove 117 that opens upward is formed between the two plate-shaped portions 115 and 116. That is, the fitting concave groove 117 extends over the entire length of the upper frame 110 in the longitudinal direction. At the tips of the two plate-shaped portions 115 and 116, a waterproof rubber 274 projecting toward the inner circumference of the fitting concave groove 117 is provided. A splicer 270 made of a U-shaped extruded aluminum profile that opens upward is attached to the central portion of the fitting recess 117 in the longitudinal direction by using a screw 264.

The plate-shaped portion 115 has a vent 119 that penetrates in the thickness direction. The vent 119 connects the outside of the curtain wall unit 100 with the fitting recess 117 to keep the pressures of both equal. The splicer 270 and the isobaric partition material 290, which will be described later, are not provided at the positions facing the vent 119.

In the upper frame main body 114, the upper ridge 250 is attached to the outer side of the curtain wall unit 100. The upper right outer skin 101 or the upper left outer skin 103 is attached between the upper frame main body 114 and the upper ridge 250 via a gasket (not shown).

The right middle bone 140 and the left middle bone 150 are fixed to the bottom surface 113 of the upper frame main body 114 using screws 260. A sealer 275 made of ethylene propylene diene rubber (EPDM) is provided between the bottom surface 113 of the upper frame main body 114 and the right middle bone 140 and the left middle bone 150. The sealer 275 receives predetermined pressure from the bottom surface 113, the right middle bone 140, and the left middle bone 150 and comes into close contact with them, and stops water between the bottom surface 113, the right middle bone 140, and the left middle bone 150.

The lower end of the right middle bone 140 of the upper curtain wall unit 100, the lower end 156a of the left middle bone 150, the lower right frame 180, and the lower left frame 190 enter into the fitting recess 117 to substantially the center in the height direction. Then, the lower right frame 180 and the lower left frame 190 come into contact with the waterproof rubber 274. As a result, the lower end of the right middle bone 140, the lower end 156a of the left middle bone 150, the lower right frame 180, and the lower left frame 190 and the inner bottom 271 of the splicer 270 run over the entire width direction of the upper frame 110. Space (second isobaric space part) 157 is created. On the other hand, the lower end of the right middle bone 140 and the lower end 156b of the left middle bone 150 of the upper curtain wall unit 100 do not enter the fitting concave groove 117 and come into contact with the plate-shaped portion 115 and the top surface of the upper frame main body 114. Instead, it is placed at a predetermined distance from the top surfaces of the plate-shaped portion 115 and the upper frame main body 114. As a result, a space, that is, a gap is created between the lower end of the right middle bone 140 and the lower end 156b of the left middle bone 150 and the upper frame 110.

Referring to FIG. 4, the right middle bone 140 and the left middle bone 150 have a U-shaped cross section that opens toward each other. The right middle bone 140 has two fitting protrusions 143 protruding from the edge of the opening over the entire length of the right middle bone 140. When the right middle bone 140 and the left middle bone 150 are combined so that their openings face each other, the two fitting protrusions 143 project toward the opening of the left middle bone 150 and open the left middle bone 150. Engage with edges 158 and 159 of. As a result, a hollow portion (first isobaric space portion) 280 is formed between the right middle bone 140 and the left middle bone 150.

A rain barrier 153 made of silicon-resistant ethylene propylene diene rubber (EPDM-S) is provided on the edge 158 of the opening of the left middle bone 150 located on the outer side of the curtain wall unit 100. The rain barrier 153 is sandwiched between the edge 158 and the fitting protrusion 143 and adheres to both to stop water, and prevents rainwater from entering the hollow portion 280. A wind barrier 155 made of silicon-resistant ethylene propylene diene rubber (EPDM-S) is provided on the edge 159 of the opening of the left middle bone 150 located on the skeleton side of the curtain wall unit 100. The wind barrier 155 is sandwiched between the edge 159 and the fitting protrusion 143 and is in close contact with both to maintain the airtightness of the hollow portion 280.

As described above, since a space is formed between the lower ends of the right middle bone 140 and the left middle bone 150 and the inner bottom 271 of the splicer 270, the fitting recess 117 provides a space continuous with the hollow portion 280. Make up.

The lower right frame 180 is fixed to the side surface 142 of the right middle bone 140 using a screw 261 and the lower left frame 190 is fixed to the side surface 152 of the left middle bone 150 using a screw 262. This fixed state is the so-called mid-bone win. Similarly, the lower right frame 180 is screwed to the side surface 121 of the right vertical frame 120, and the lower left frame 190 is screwed to the side surface 131 of the left vertical frame 130.

Between the side surface 142 of the right middle bone 140 and the lower right frame 180, between the side surface 152 of the left middle bone 150 and the lower left frame 190, between the side surface 121 of the right vertical frame 120 and the lower right frame 180, and the left vertical frame. A sealer 272 made of ethylene propylene diene rubber (EPDM) is provided between the side surface 131 of the frame 130 and the lower left frame 190. The sealer 272 receives a predetermined pressure from the side surface 142 and the lower right frame 180 and comes into close contact with them, and stops water between the side surface 142 and the lower right frame 180. The water is also stopped for the left middle bone 150, the right vertical frame 120, and the left vertical frame 130.

In the conventional lower frame winning configuration, which is not the middle bone winning configuration, the right middle bone and the left middle bone are fixed to the top surface of one lower frame via a sealer. In this configuration, if there is an error in the length between the right and left middle bones, the pressure between the right middle bone and the lower frame and the pressure between the left middle bone and the lower frame should be uniform. However, the watertightness could not be maintained on the one where the pressure was weak, and rainwater could enter the skeleton side beyond the curtain wall unit. However, in the present embodiment, by winning the middle bone, the lower right frame 180 and the right middle bone 140 are in close contact with each other via the sealer 272 regardless of the pressure between the lower left frame 190 and the left middle bone 150, and are watertight. It is possible to reliably maintain the property and prevent rainwater from entering the skeleton side beyond the curtain wall unit 100. Similarly, the lower left frame 190 and the left middle bone 150 can prevent rainwater from entering the skeleton side regardless of the pressure between the lower right frame 180 and the right middle bone 140.

Two isobaric compartments 290 made of chloroprene rubber sponge are provided in the fitting recess 117. The ends of the two isobaric partition members 290 are in close contact with each of both ends of the splicer 270 in the longitudinal direction via the sealing material 291. In the isobaric partition material 290, the other end that does not come into close contact with the splicer 270 is stopped by using the sealing material 291. The top surface of the isobaric partition member 290 has an inverted shape of the bottoms of the lower right frame 180 and the lower left frame 190 that have entered the fitting concave groove 117, and is in close contact with the bottoms of the lower right frame 180 and the lower left frame 190. To do. The bottom surface of the isobaric partition member 290 is in close contact with the bottom surface of the fitting concave groove 117. As a result, the space 157 is divided in the width direction by the isobaric partition member 290.

Four L-shaped engaging projections 241 extending over the entire length of the lower reinforcing member 240 are provided on the outer periphery of the lower reinforcing member 240, and the inner circumference of the right middle bone 140 and the left middle bone 150 is right middle. Four L-shaped engaging projections 144 and 154 extending over a part or the entire length of the bone 140 and the left middle bone 150 are provided. The engaging protrusions 241 engage with the engaging protrusions 144 and 154 provided on the inner circumferences of the right middle bone 140 and the left middle bone 150, respectively. As a result, the lower reinforcing member 240, the right middle bone 140 and the left middle bone 150 are fixed to each other with respect to the horizontal plane. The lower reinforcing member 240 is fixed to the fitting projection 143 of the left middle bone 150 by using a screw 263. With the above members, the right middle bone 140 and the left middle bone 150 are fixed to each other in close contact with each other, and are affected by external forces such as wind pressure received after the curtain wall unit 100 is transported and attached to the building. , The right middle bone 140 and the left middle bone 150 do not separate from each other.

The internal closing rubber 273 is attached from the skeleton side of the screw 263 attached to the skeleton side of the right middle bone 140 and the left middle bone 150. This makes it possible to prevent rainwater or air from entering the hollow portion 280 from around the screw 263.

FIG. 5 shows a cross section of the upper reinforcing member 230. The upper reinforcing member 230 has the same shape as the lower reinforcing member 240, and is connected to the right middle bone 140 and the left middle bone 150 by the same configuration. As a result, the right middle bone 140 and the left middle bone 150 are fixed in close contact with each other, and the right is due to the external force applied when the curtain wall unit 100 is transported and attached, and the external force such as the wind pressure received after being attached to the building. The middle bone 140 and the left middle bone 150 do not separate from each other.

Next, the flow of the outside air will be described with reference to FIG. For ease of explanation, the splicer 270 and the isobaric partition material 290 are omitted in FIG. Outside air flows from the vent 119 of the curtain wall unit 100a located on the lower side in the gravity direction into the fitting recess 117 of the curtain wall unit 100b located on the upper side in the gravity direction. Here, as described above, the fitting recess 117 extends from the vent 119 below the lower ends of the right middle bone 140 and the left middle bone 150. Therefore, the outside air flows in and out to the hollow portion 280 through the fitting concave groove 117. On the other hand, as described above, there is a gap between the upper frame 110 of the curtain wall unit 100a located on the lower side in the direction of gravity and the lower ends of the right middle bone 140 and the left middle bone 150. Through this gap, the outside air flows in and out to the hollow portion 280. As a result, the fitting concave groove 117 and the hollow portion 280 are maintained at the same pressure as the outside air pressure, and rainwater does not enter due to the pressure difference.

In the conventional lower frame winning configuration, the right middle bone and the left middle bone are fixed to the top surface of one lower frame via a sealer, so that the inside of the right middle bone and the left middle bone is the top surface of the lower frame. It was cut off from the outside air and was not at the same pressure as the outside air. Therefore, rainwater may infiltrate the inside of the right and left middle bones due to the pressure difference between the inside and the outside air. To prevent this, seal around the screw connecting the right and left middle bones. I needed it. However, in the present embodiment, since the hollow portion 280 has the same pressure as the outside air due to the central bone winning against the lower frame, rainwater rarely enters the hollow portion 280 and the skeleton side. Therefore, it is not necessary to seal the screw connecting the right and left middle bones, for example, around the screw 263, and it is sufficient to stop the water by the rain barrier 153, which is simpler than the seal around the screw. When the water stoppage by the rain barrier 153 is used, the water stoppage treatment is completed only by inserting the fitting protrusion 143 into the left middle bone 150, so that the curtain wall unit 100 can be assembled more easily than before.

According to the present embodiment, a curtain wall unit capable of stopping water between the curtain wall and the skeleton while having an isobaric section is obtained.

The upper right outer skin 101 and the upper left outer skin 103 are not limited to float glass, and may be made of a known panel material such as Low-E double glazing or a metal panel, and the lower right outer skin 102 and the lower left. The outer skin 104 is not limited to the Low-E double glazing, and may be made of a known panel material such as a float glass or a metal panel. Further, the upper right inner skin and the upper left inner skin 106 are not limited to the fireproof panel, and may be float glass, Low-E double glazing, metal, stone, resin, or a combination thereof. Further, float glass, Low-E double glazing, metal, stone, resin, or a combination thereof may be provided on the indoor side of the lower right outer skin 102 and the lower left outer skin 104.

The right intermediate frame 160 and the left intermediate frame 170 may not be provided. In this case, one outer skin is used instead of the upper right outer skin 101 and the lower right outer skin 102, and the upper left outer skin 103 and the lower left outer skin 104, respectively.

Although the vent 119 has been described as being provided in the center of the upper frame 190, the vent 119 may be provided in any of the longitudinal directions of the upper frame 190, or a plurality of vents 119 may be provided. In this case, the isobaric partition material 290 is provided at the end of the splicer 270 closest to the right vertical frame 120 and the left vertical frame 130, whereby the outside air is not blocked by the isobaric partition material 290 and is formed in the hollow portion 280. Can flow in.

The number of the right middle bone 140 and the left middle bone 150 is not limited to one, and may be plural. That is, one middle bone composed of the right middle bone 140 and the left middle bone 150 may be provided in the frame body in a plurality of rows in the width direction. At this time, a lower frame for connecting the middle bones is provided, and two or more outer skins are provided in the width direction. Further, the right middle bone 140 does not have to have two fitting protrusions 143, and the left middle bone 150 does not have to have two fitting protrusions 143, and the right middle bone 140 and the left middle bone 150 do not have to be provided. May be provided with one fitting projection 143 at a time.

The screw 263 may not be provided, and the right middle bone 140 and the left middle bone 150 may be fixed only by the engaging protrusions 241 and 144 and 154. Further, the engaging protrusions 241 and 144, 154 may not be provided, and the right middle bone 140 and the left middle bone 150 may be fixed only by the screw 263.

Either one or both of the upper reinforcing member 230 and the lower reinforcing member 240 may not be provided. Further, the positions of the upper reinforcing member 230 and the lower reinforcing member 240 are not limited to the above-mentioned positions, and may be any positions with respect to the height direction of the right middle bone 140 and the left middle bone 150.

The size of each member shown in the present specification and the drawings is an example, and is not limited to these sizes. Moreover, the material of each member is an example, and is not limited to these materials.

Although embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art will appreciate that the modifications are made in relation to the structure of each part without departing from the scope and spirit of the described invention. It is self-evident to.

Claims (7)

With the upper frame
A pair of middle bones attached between both ends of the upper frame,
The vertical frame attached to both ends of the upper frame and
A lower frame attached between the lower end of the vertical frame and the lower end of the middle bone is provided.
The lower frame is attached to the side surface of the middle bone and
The pair of middle bones are combined with each other to form a first isobaric space.
A curtain wall unit characterized in that the first isobaric space portion is open to the outside and outside air can enter and exit the first isobaric space portion. The upper frame has a vent and a fitting portion to which a lower frame of another curtain wall unit adjacent above the curtain wall unit is connected.
In a state where the upper frame and the lower frame of the other curtain wall unit are fitted, a second isobaric space portion is formed between the fitting portion and the lower frame of the other curtain wall unit. The second isobaric space portion communicates with the first isobaric space portion, and is communicated with the first isobaric space portion.
The curtain wall unit according to claim 1, wherein the vent is for allowing outside air to enter and exit the first isobaric space through the second isobaric space. The curtain wall unit according to claim 1 or 2, further comprising a sealing member provided between the lower frame and the middle bone. The curtain wall unit according to any one of claims 1 to 3, wherein the middle bone includes a reinforcing material that regulates the movement of the middle bone in a direction perpendicular to the longitudinal direction of the middle bone. The middle bone comprises a reinforcing material that regulates the movement of the middle bone in a direction perpendicular to the longitudinal direction of the middle bone.
The curtain wall unit according to any one of claims 1 to 4, wherein the reinforcing material is provided at substantially the center in the longitudinal direction of the middle bone. The middle bone comprises a reinforcing material that regulates the movement of the middle bone in a direction perpendicular to the longitudinal direction of the middle bone.
The curtain wall unit according to any one of claims 1 to 5, wherein the reinforcing material is provided near the lower end portion of the middle bone. The curtain wall unit according to any one of claims 1 to 6, wherein the middle bone is attached to the bottom surface of the upper frame.

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