JP2012007374A - Curtain wall - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a curtain wall capable of preventing dew condensation at a spandrel part without requiring complicated works.SOLUTION: A curtain wall 1 includes a spandrel part 15 and a wall part 20. A joint part 30 is formed at an adjacent region 12 close to a frame attachment region 14 of a precast concrete panel 11, or between the frame attachment region 14 and the adjacent region 12. The precast concrete panel 11 includes ventilation passages 31, 33 for ventilating air in a hollow layer 16 defined by a glass panel 19, a frame 17 and the precast concrete panel 11 to the joint part 30. The joint part 30 includes an exhaust structure 35 for discharging air in the ventilation passages 31, 33 outside. An air introduction part 18 capable of introducing outdoor air into the hollow layer 16 is provided at a lower position than the exhaust structure 35.

Description

  The present invention relates to a curtain wall.

  In recent years, an increasing number of buildings have exterior walls with curtain walls that are easy to construct on site and have high design. The curtain wall is a curtain wall unit including a window portion disposed in a portion corresponding to a living space, and a beam portion (spandrel portion) disposed above and below the window portion and corresponding to a ceiling and a floor. They are arranged in the horizontal and vertical directions.

  The window part of the curtain wall unit is partitioned indoors and outdoors by a glass panel, and the glass panel is often attached to the outdoor side of the spandrel part in the same manner as the window part from the viewpoint of high design. In order to obtain a fireproof structure, the spandrel portion provided with such a glass panel is provided with a fireproof panel on the indoor side, whereby a sealed shape is provided between the glass panel and the fireproof panel. A space is formed.

  In the spandrel portion having such a configuration, moisture contained in the fireproof panel evaporates into a sealed space due to the irradiation of sunlight and increases the humidity in the space. Condensation may occur on the glass panel when cooled. When condensation occurs on the glass panel, there is a concern about corrosion of the frame (sash) that attaches the glass panel to the fireproof panel.

  Therefore, in order to prevent condensation on the glass panel of the spandrel part, a method of preventing evaporation of moisture by forming a coating film on the surface of the fireproof panel facing the sealed space, Patent Document 1 For example, a method is provided in which a ventilation path that communicates between a sealed space and an indoor space is provided, and the ventilation path is opened and closed as necessary.

JP 2008-267021 A

  However, in the method of forming a coating film on the surface of the fireproof panel, it is impossible to prevent high-humidity air from staying in a sealed space when there is a large temperature difference between the inside and outside of the room. There is a concern that dew condensation will occur.

  In the method proposed in Patent Document 1, when the temperature difference between the inside and outside of the room is large, if the air passage is kept open, the humidity becomes high inside the room due to the temperature difference between the inside and outside of the room. Condensation may occur when air flows into a sealed space and the air that flows in is cooled. Therefore, when the method proposed in Patent Document 1 is taken, a complicated operation of opening and closing the air passage is required.

  The present invention has been completed based on the above circumstances, and an object of the present invention is to provide a curtain wall that can prevent the condensation of the glass panel in the spandrel portion without requiring a complicated operation.

  In order to solve the above-mentioned problems, the present invention includes a frame body in which a glass panel is disposed on the inside, and a precast concrete panel in which the frame body is attached to an outdoor surface with a gap between the frame body and the glass panel. A curtain wall comprising a spandrel part and a window part to which a glass panel is attached, the adjacent area adjacent to the frame attachment area to which the frame of the precast concrete panel is attached or the frame attachment area and the adjacent A joint portion is formed between the regions, and the precast concrete panel has a ventilation layer for ventilating air of a hollow layer surrounded by the glass panel, the frame body, and the precast concrete panel to the joint portion. A passage is formed, and the joint portion has an exhaust structure for discharging the air in the ventilation path to the outside of the room, and the exhaust structure The Rimoshita side, having characterized in that the air introducing portion capable introduce outdoor air into the hollow layer is provided.

  In the present invention, the air introduced into the hollow layer from the air introduction part moves upward through the hollow layer, passes through the air passage provided in the precast concrete panel, and is adjacent to the frame attachment region or the frame. The air is exhausted to the outside of the building through a joint exhaust structure formed between the attachment region and the adjacent region.

  In the present invention, the joint portion has an exhaust structure for discharging air in the hollow layer, and the air introduction portion for introducing air into the hollow layer is provided below the joint portion having the exhaust structure. Therefore, there is a difference in height between the air introduction part and the part that discharges air (the part where the exhaust structure is provided).

  Therefore, in the present invention, even if moisture contained in the precast concrete panel evaporates due to sunlight irradiation or the like, or even if the humidity of the air in the hollow layer of the spandrel portion increases due to the inflow of high humidity air or the like, this humidity High air does not stay in the hollow layer, moves smoothly upward (in the direction where the joint portion having the exhaust structure is located), and is exhausted to the outside of the building. As a result, according to the present invention, it is possible to prevent condensation on the glass panel of the spandrel portion.

  In addition, according to the present invention, the joint portion (exhaust structure) and the air introduction portion are both arranged on the outside of the room, are not easily affected by indoor humidity due to heating and humidification, and there is no inflow of indoor air. Problems are unlikely to occur. As a result, according to the present invention, it is not necessary to open and close the air introduction part and the exhaust structure even when there is a temperature difference between the room and the outside.

The present invention may have the following configurations.
The air introduction part may be provided at a lower end part of the frame.
With such a configuration, since the air introduction part is provided in the frame that is a member surrounding the hollow layer, no separate member (such as a ventilation pipe) is required to introduce air between the air introduction part and the hollow layer. is there.

  A cylindrical passage cylinder may be attached to the air passage, and an upper end of the passage cylinder may be disposed at a position higher than a lower end portion of the joint portion. With such a configuration, it is possible to reliably prevent rainwater and the like from entering the air passage through the joint.

  You may comprise the said joint part with an open joint. With such a configuration, the area of the exhaust structure is increased and the ventilation volume is increased, so that the dew condensation prevention effect can be enhanced.

  ADVANTAGE OF THE INVENTION According to this invention, the curtain wall which can prevent dew condensation of the glass panel of a spandrel part without requiring a complicated operation can be provided.

The partial back view of the curtain wall of Embodiment 1 Partial sectional view of the curtain wall taken along line XX in FIG. Partial sectional view of curtain wall unit Partial sectional view explaining air flow in spandrel Partial sectional view of the curtain wall of the second embodiment Partial rear view of curtain wall of embodiment 3 Partial sectional view explaining air flow in spandrel Partial sectional view of the curtain wall taken along line AA in FIG. Partial sectional view of curtain wall described in other embodiment (1)

<Embodiment 1>
Embodiment 1 of the present invention will be described with reference to FIGS. In the following description, the vertical direction is based on each figure, the left side in FIGS. 2 to 4 means the outdoor side, and the right side means the indoor side. FIG. 1 is a view showing a part of the curtain wall 1 viewed from the indoor side.
The curtain wall 1 of this embodiment is attached to the exterior of a building. As shown in FIG. 1, the curtain wall 1 is arranged in the building housing 2 in a state where a plurality of curtain wall units 10 are arranged in the vertical direction and the horizontal direction. It is attached.

  As shown in FIGS. 1 and 2, the curtain wall unit 10 is fixed by screwing a mounting bracket 5 such as a nut to a bracket 4 provided on a steel frame 3 of a building housing 2, and a precast concrete panel. 11 (PC plate 11) and a frame 17 having a glass panel 19 arranged inside. As the frame body 17, a metal sash such as aluminum can be used.

  At the upper end of the curtain wall unit 10, the PC plate 11 is formed with a portion protruding from the outdoor side in the shape of an eave (referred to as an eave portion 12) as shown in FIG. Glass panels 19 and 22 are arranged in a region extending from just below the eaves portion 12 of the PC plate 11 to the lower end of the curtain wall unit 10.

  As shown in FIG. 3, a frame body 17 having a substantially C-shaped cross section and a glass panel 19 disposed on the inside of the outdoor surface is attached to the PC plate 11 just below the eaves portion 12. A portion 13 (referred to as a C-shaped portion 13) is provided. Since the frame 17 and the glass panel 19 attached to the C-shaped portion 13 of the PC plate 11 are not visible from the indoor side, the frame 17 and the glass panel 19 of the C-shaped portion 13 are attached in FIG. The region (frame body attachment region 14) is indicated by a dotted line.

  A predetermined interval is provided between the outdoor surface 13A of the C-shaped portion 13 of the PC plate 11 and the glass panel 19 disposed inside the frame body 17 attached to the C-shaped portion 13. A space 16 (hollow layer 16) surrounded by the outdoor surface 13A of the C-shaped portion 13 of the PC plate 11, the glass panel 19, and the frame body 17 is formed. An air introduction hole 18 (air introduction portion 18) through which outdoor air can be introduced into the hollow layer 16 is provided at the lower end portion of the frame body 17 attached to the C-shaped portion 13 of the PC plate 11.

  A portion 15 including the eaves portion 12 and the C-shaped portion 13 of the PC plate 11 is a beam portion 15 (spandrel portion 15) disposed in a portion corresponding to the ceiling or floor of the building. The part 20 which is arrange | positioned under the spandrel part 15 and to which the frame 21 which has arrange | positioned the glass panel 22 inside is attached is the window part 20 arrange | positioned in the part corresponding to living space. In the curtain wall 1 of this embodiment, the window part 20 and the spandrel part 15 are alternately arranged in the up-down direction.

  Now, on the lower surface of the eaves part 12 (the adjacent area 12 adjacent to the frame attachment area 14 of the PC plate 11), as shown in FIG. 3, the spandrel part 15 is divided into the eaves part 12 and the C-shaped part 13. A joint portion 30 is formed. Specifically, the joint portion 30 is formed on the protruding end 12 </ b> A of the eaves portion 12 protruding in the outdoor direction from the frame attachment region 14 of the PC plate 11. The joint portion 30 is attached with an exhaust cylinder 35 that communicates from a first air passage 31 (described later) to the outside of the room and exhausts the air vented to the first air passage 31 to the outside (corresponding to the exhaust structure 35). ). In the joint portion 30, a known sealing material 36 is filled in the periphery of the exhaust tube 35.

  Further, the eaves portion 12 is provided with a substantially L-shaped first air passage 31 that continues from the exhaust pipe 35 of the joint portion 30. More specifically, the first air passage 31 is formed up to the position reaching the indoor side surface 11B of the PC plate 11 through the bent part 31A bent upward toward the indoor side after rising upward from the joint part 30. .

  The portion 31B on the indoor side of the bent portion 31A of the first air passage 31 is higher than the joint portion 30. An upper end 34A of a ventilation pipe 34 attached to a second ventilation path 33, which will be described later, is disposed in a portion 31B on the indoor side of the bent portion 31A of the first ventilation path 31. Further, the outdoor air is blocked from flowing into the indoor portion 31B of the bent portion 31A of the first air passage 31 and the indoor air flows into the first air passage 31. The packing 32 which interrupts | blocks is attached.

  At the upper end of the C-shaped portion 13 of the PC plate 11, a second air passage 33 is formed which extends from the upper end of the hollow layer 16 to the indoor side and then bends upward to communicate with the first air passage 31. . A vinyl chloride ventilation pipe 34 (cylindrical communication cylinder 34) is attached to the second ventilation path 33, and an upper end 34 </ b> A of the ventilation pipe 34 is arranged to protrude into the first ventilation path 31. ing. In other words, the ventilation pipe 34 is arranged so that the upper end 34 </ b> A is higher than the lower end 30 </ b> A of the joint portion 30, so that rainwater or the like enters the second ventilation path 33 via the joint portion 30. Preventing intrusion.

Next, the effect | action of this embodiment is demonstrated, referring FIG. 4 which showed the direction through which an air flows with the arrow line.
In the present embodiment, the air introduced into the hollow layer 16 from the air introduction hole 18 provided in the frame body 17 of the spandrel portion 15 moves upward as shown in FIG. 13 enters the first ventilation path 31 through the ventilation pipe 34 of the second ventilation path 33 provided in 13. Since the packing 32 is attached to the first air passage 31, the air that has moved to the first air passage 31 moves to the outdoor side without moving to the indoor side, and the protruding end 12 </ b> A of the eaves portion 12. It is exhausted to the outside of the building through the exhaust pipe 35 of the joint portion 30 provided in the building.

Next, the effect of this embodiment will be described.
In the present embodiment, an air introduction hole 18 for introducing air into the hollow layer 16 is formed in the frame body 17, and the hollow layer is interposed via the exhaust cylinder 35 of the joint portion 30 provided above the air introduction hole 18. Since the air in 16 is discharged, there is a difference in height between the air introduction hole 18 and the exhaust cylinder 35 of the joint portion 30. Further, an air introduction hole 18 for introducing air into the hollow layer 16 is formed in the frame body 17, and the air in the hollow layer 16 is connected via a joint portion 30 provided in the PC plate 11, which is a separate member from the frame body 17. Is discharged, the pressure difference is larger than when the air introduction hole 18 and the exhaust structure 35 are provided in the same member. That is, according to this embodiment, the air in the hollow layer 16 of the spandrel part 15 moves without staying.

  Therefore, in this embodiment, even if the moisture contained in the PC plate 11 evaporates due to the irradiation of sunlight or the like, or even if the humidity of the air in the hollow layer 16 of the spandrel portion 15 increases due to the inflow of high-humidity air or the like. The high-humidity air does not stay in the hollow layer 16, moves smoothly to the joint portion 30 located above, and is exhausted outside the building. As a result, according to the present embodiment, condensation of the glass panel 19 of the spandrel portion 15 can be prevented.

Further, according to the present embodiment, the joint portion 30 (exhaust structure 35) and the air introduction hole 18 are both arranged on the outdoor side, are not easily affected by the indoor humidity due to heating and humidification, and there is no inflow of indoor air. Therefore, the problem of condensation is unlikely to occur. As a result, according to the present embodiment, it is not necessary to open and close the air introduction hole 18 and the exhaust structure 35 even when there is a temperature difference between the room and the outside.
Therefore, according to the present embodiment, it is possible to provide the curtain wall 1 that can prevent the condensation of the glass panel 19 of the spandrel portion 15 without requiring a complicated operation.

  Furthermore, in this embodiment, since the air introduction hole 18 is provided in the frame 17 that is a member surrounding the hollow layer 16, another member (pipe) is used to introduce air between the air introduction hole 18 and the hollow layer 16. Etc.) and the air introduction hole 18 is easy to install.

  Furthermore, according to this embodiment, since the ventilation pipe 34 is attached to the second ventilation path 33 so that the upper end 34A thereof is disposed at a position higher than the lower end part 30A of the joint part 30, Rainwater or the like can be reliably prevented from entering the second ventilation path 33 through the joint portion 30.

<Embodiment 2>
Next, Embodiment 2 of the present invention will be described with reference to FIG.
The curtain wall 71 of the present embodiment is different from that of the first embodiment in that the eaves portion 12 is not provided on the outdoor surface 81A of the PC plate 81 and the joint portion 90 is configured by an open joint. The same components as those in the first embodiment are denoted by the same reference numerals, and redundant description is omitted.
At the upper end of the curtain wall unit 80, the PC plate 81 is formed with a C-shaped portion 83 having a C-shape. The portion where the C-shaped portion 83 is formed is a portion corresponding to the spandrel portion 85.

  A frame 87 having a glass panel 89 disposed inside is attached to a portion of the C-shaped portion 83 of the PC plate 81 where a recessed portion 83A is formed on the indoor side. Is formed.

  A joint 90 that divides the adjacent region 82 into upper and lower regions 82A and 82B is formed in an upper region (adjacent region 82) of the frame attachment region 84 to which the frame 87 of the C-shaped portion 83 is attached. . Since the joint portion 90 is formed of an open joint, an exhaust structure 90 is inevitably installed for equal pressure, and the air moved from the hollow layer 86 is exhausted using the exhaust structure 90.

  The third air passage 91 that extends from the joint portion 90 to the indoor side rises upward from the joint portion 90, and then passes through a bent portion 91A that is bent toward the indoor side, so that the surface on the indoor side of the PC plate 81 (not shown). ) To the position up to.

  Of the adjacent regions 82A and 82B adjacent to the frame attachment region 84, the region 82B below the joint portion 90 extends substantially laterally to the indoor side and then bends upward to form the third air passage 91. A flat fourth air passage 93 is formed. A cylindrical ventilation pipe 94 is attached to the fourth ventilation path 93 such that the upper end portion 94 </ b> A is higher than the lower end portion 90 </ b> A of the joint portion 90.

The effect | action of this embodiment is demonstrated with reference to FIG. 5 which showed the direction through which air flows with the arrow line.
In the present embodiment, the air introduced into the hollow layer 86 from the air introduction hole 88 (air introduction portion 88) provided in the frame 87 of the C-shaped portion 83 moves upward as shown in FIG. The PC plate 81 passes through the ventilation pipe 94 of the fourth ventilation path 93 and enters the third ventilation path 91. Since the packing 32 is attached to the third ventilation path 91, the air that has moved from the fourth ventilation path 93 to the third ventilation path 91 moves to the outdoor side without moving to the indoor side, The air is exhausted outside the building through the joint portion 90.

Next, the effect of this embodiment will be described.
According to the present embodiment, similar to the first embodiment, there is a difference in height between the air introduction hole 88 and the joint portion 90 having the exhaust structure. When the air introduced from the air introduction hole 88 provided in the lower end portion of the frame body 87 is warmed in the hollow layer 86, the warmed air smoothly moves upward without being retained in the hollow layer 86 and is discharged. Therefore, the condensation of the glass panel 89 in the spandrel 85 can be prevented.

In addition, according to the present embodiment, the joint portion 90 (exhaust structure) and the air introduction hole 88 are both arranged on the outdoor side, and are not easily affected by the indoor humidity due to heating and humidification, and there is no inflow of indoor air. Condensation is unlikely to occur. As a result, according to this embodiment, it is not necessary to open and close the air introduction hole 88 and the joint portion 90 (exhaust structure) even when there is a temperature difference between the room and the outside.
Therefore, according to the present embodiment, it is possible to provide the curtain wall 71 that can prevent the condensation of the glass panel 89 of the spandrel portion 85 without requiring a complicated operation.

  Further, according to the present embodiment, as in the first embodiment, the ventilation pipe 94 is attached to the fourth ventilation path 93 so that the position of the upper end portion 94A is higher than the lower end portion 90A of the joint portion 90. Therefore, it is possible to reliably prevent rainwater or the like from entering the fourth air passage 93 through the joint portion 90.

  Furthermore, in this embodiment, since the air introduction hole 88 is provided in the frame 87 which is a member surrounding the hollow layer 86, another member (pipe) is used to introduce air between the air introduction hole 88 and the hollow layer 86. Etc.) and the air introduction hole 88 can be easily installed.

  Furthermore, according to the present embodiment, since the joint portion 90 is configured by an open joint, the area of the exhaust structure is increased and the ventilation amount is increased, so that the dew condensation prevention effect can be enhanced.

<Embodiment 3>
Next, a third embodiment of the present invention will be described with reference to FIGS.
The curtain wall 100 of this embodiment is an embodiment in that an air introduction part 111B for introducing outdoor air is provided in a vertical joint 111 formed between curtain wall units 110 and 110 adjacent in the left-right direction in FIG. 2 and different. The same components as those in the second embodiment are denoted by the same reference numerals, and redundant description is omitted.

  As shown in FIG. 8, the vertical joint 111 provided with the air introduction part 111B is configured by an open joint, so that the air introduction part 111B is inevitably installed for equal pressure. Outdoor air is introduced using 111B. The open joint constituting the vertical joint 111 is attached to a fifth air passage 111A formed in the indoor direction from the outdoor surface of the PC plate. The PC plate 81 is formed with a sixth air passage 112 communicating with the hollow layer from the fifth air passage 111 </ b> A, and an air pipe 113 is attached to the sixth air passage 112. A packing 114 is attached to the fifth air passage 111 </ b> A on the indoor side of the fifth air passage 111 </ b> A rather than a place intersecting the sixth air passage 112.

The effect | action of this embodiment is demonstrated with reference to FIG. 7 and FIG. 8 which showed the direction through which an air flows with the arrow line.
In this embodiment, the air introduced from the air introduction part 111B provided in the vertical joint 111 moves through the fifth ventilation path 111A to the indoor side. Since the packing 114 is attached to the fifth ventilation path 111A, the air that has moved through the fifth ventilation path 111A does not move to the indoor side of the packing 114 but moves to the sixth ventilation path 112. (See FIG. 8).

  As shown in FIG. 7, the air that has moved to the sixth ventilation path 112 passes through the ventilation pipe 113 of the sixth ventilation path 112 and enters the hollow layer 86 of the spandrel portion 85. The air that has entered the hollow layer 86 moves upward, passes through the ventilation pipe 94 of the fourth ventilation path 93 of the PC plate 81, and enters the third ventilation path 91. Since the packing 32 is attached to the third ventilation path 91, the air that has moved from the fourth ventilation path 93 to the third ventilation path 91 moves to the outdoor side without moving to the indoor side, The air is exhausted outside the building through the joint portion 90.

Next, the effect of this embodiment will be described.
According to the present embodiment, as in the first embodiment, there is a difference in height between the air introduction portion 111B and the joint portion 90 having the exhaust structure, and the air in the hollow layer 86 of the spandrel portion 85 moves upward without being retained. Thus, condensation of the glass panel 89 of the spandrel 85 can be prevented.
In addition, according to the present embodiment, the joint portion 90 (exhaust structure) and the air introduction portion 111B are both arranged on the outdoor side, and are not easily affected by the indoor humidity due to heating and humidification, and there is no inflow of indoor air. Condensation is unlikely to occur. As a result, it is not necessary to open and close the air introduction part 111B and the joint part 90 (exhaust structure) even when there is a temperature difference between indoors and outdoors.
Therefore, according to this embodiment as well, it is possible to provide the curtain wall 100 that can prevent the condensation of the glass panel 89 of the spandrel portion 85 without requiring a complicated operation.

  Further, according to the present embodiment, as in the first embodiment, the ventilation pipe 94 is attached to the fourth ventilation path 93 so that the position of the upper end portion 94A is higher than the lower end portion 90A of the joint portion 90. Therefore, it is possible to reliably prevent rainwater or the like from entering the fourth air passage 93 through the joint portion 90.

  Furthermore, according to the present embodiment, since the joint portion 90 is configured by an open joint, the area of the exhaust structure is increased and the ventilation amount is increased, so that the dew condensation prevention effect can be enhanced.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.
(1) In the above first to third embodiments, the entire frame attached to the spandrel portion can be seen from the outside. For example, as shown in FIG. It is good also as a structure accommodated in the inside. The curtain wall 120 shown in FIG. 9 is substantially the same as the curtain wall of the third embodiment except for the above-described configuration.
(2) In the first embodiment, the PC plate having the eaves portion in the adjacent region and the joint portion filled with the sealing material are shown. However, the joint portion may be constituted by an open joint. Good.
(3) In the above-described embodiment, the one provided with the ventilation path to which the ventilation pipe is attached is shown. However, only the ventilation path to which the ventilation pipe is not attached may be provided.
(4) In the above-described embodiment, the portion where the PC plate is exposed to the outside is formed at the upper end of the curtain wall unit. It may be a curtain wall. With such a configuration, a building with a beautiful appearance can be obtained, which is preferable in terms of design.

1, 71, 100, 120 ... Curtain wall 10, 80, 110 ... Curtain wall unit 11, 81 ... Precast concrete panel (PC version)
12, 82 ... Adjacent region 14, 84 ... Frame body attachment region 15, 85 ... Spandrel portion 16, 86 ... Hollow layer 17, 87 ... Frame body (of spandrel portion) 18, 88 ... Air introduction hole (air introduction portion)
19, 89 ... Glass panel (of spandrel part) 20 ... Window part 21 ... Frame body (of window part) 22 ... Glass panel (of window part) 30 ... Joint part 30A, 90A ... Lower end part of joint part 31 ... First Air passage (air passage)
33 ... Second air passage (air passage)
34, 94 ... Ventilation pipe (cylinder)
34A, 94A: upper end of ventilation pipe (through cylinder) 35 exhaust cylinder (exhaust structure)
90 ... Joint (exhaust structure)
111 ... Vertical joint 111B ... Air introduction part

Claims (4)

A frame having a glass panel disposed inside, a spandrel portion having a precast concrete panel having the frame attached to an outdoor surface with a space between the glass panel, and a window having a glass panel A curtain wall comprising:
A joint portion is formed between the adjacent region adjacent to the frame attachment region to which the frame of the precast concrete panel is attached or between the frame attachment region and the adjacent region,
In the precast concrete panel, an air passage is formed to vent the air of a hollow layer surrounded by the glass panel, the frame body, and the precast concrete panel to the joint portion,
The joint has an exhaust structure for discharging the air in the ventilation path to the outside,
A curtain wall, characterized in that an air introduction part capable of introducing outdoor air into the hollow layer is provided below the exhaust structure. The curtain wall according to claim 1, wherein the air introduction portion is provided at a lower end portion of the frame body. The cylindrical passage cylinder is attached to the air passage, and an upper end of the passage cylinder is arranged at a position higher than a lower end portion of the joint portion. curtain wall. The curtain wall according to any one of claims 1 to 3, wherein the joint portion is configured by an open joint.

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