JP2008184817A - Curtain wall - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a curtain wall capable of simply suppressing dew condensation produced in the hollow layer of the spandrel part. <P>SOLUTION: This curtain wall 1 has an opening part 10 and the spandrel part 20. The spandrel part has frame bodies 21, 24, 30 forming the outer frame of the spandrel part; a glass panel 26 arranged inside the frame body; and a fireproof panel 27 arranged on the indoor side more than the glass panel with a predetermined gap interposed between itself and the glass panel, allowing the access of air between the indoor side and the outdoor side, and mounted on the frame body. The curtain wall comprises the hollow layer S surrounded by the frame body, the glass panel, and the fireproof panel; and ventilation means for allowing the inflow of air from the outdoor side into the hollow layer only when the pressure on the outdoor side is higher than the pressure in the hollow layer by a predetermined pressure and cutting out inflow in the other cases. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a curtain wall used in a building, and more particularly to a curtain wall that is less likely to cause dew condensation in a spandrel portion and that is excellent in durability.

  Curtain walls are often used as exterior parts of buildings, and their demands are diverse. Curtain walls are widely used in newly constructed and rebuilt buildings because curtain walls units assembled at the factory need only be attached to the building frame with metal fittings, so they have excellent workability and high design from the viewpoint of appearance.

  The curtain wall unit includes an opening and a spandrel part (sometimes referred to as a “waist”) disposed above and below the opening, and the opening is formed on the outer periphery of the building corresponding to the living space of the building. It arrange | positions and has divided the indoor side and the outdoor side with the glass panel.

  On the other hand, the spandrel portion is disposed above and below the opening and is provided on the outer peripheral portion of the building corresponding to the floor and ceiling of the building. 11 and 12 are cross-sectional views of the curtain wall 101 focusing on the spandrel portion 120 according to the conventional example. FIG. 11 is a vertical sectional view in a posture in which the curtain wall 101 is attached to a building, and FIG. 12 is a horizontal sectional view of the same. In FIG. 11, the left side of the drawing is the outdoor side, and the right side of the drawing is the indoor side. In FIG. 12, the upper side of the paper is the outdoor side, and the lower side of the paper is the indoor side.

  The spandrel part 120 is disposed between the opening part 110 and the opening part 110, and is disposed on the indoor side with a predetermined interval substantially parallel to the glass panel 126 and the glass panel 126 facing the outside of the room. The fireproof panel 127 is provided. The fireproof panel 127 is arranged to conceal the interior of the building from the outside view and to meet disaster prevention requirements. In particular, for reasons of fire resistance, calcium silicate is used as a material for the fireproof panel 127.

  In addition, a vertical frame 130 and horizontal frames 121 and 124 made of a mold material are arranged on four sides of the glass panel 126 and the fireproof panel 127. Accordingly, as shown by T in FIGS. 11 and 12, the spandrel portion 120 has a hollow layer T surrounded by the glass panel 126, the fireproof panel 127, the vertical frame 130, and the horizontal frames 121 and 124.

  In such a configuration of the spandrel part 120, conventionally, there has been a problem that condensation occurs on the surface of the glass panel 126 of the spandrel part 120. One reason for this is that air humidified at a high temperature in the room flows into the hollow layer T from the gap between the refractory panel and the frame, and is cooled and condensed. Further, as another reason, when moisture contained in the fireproof panel 127 evaporates into the hollow layer T due to solar radiation or the like and the humidity of the hollow layer T rises, and this is cooled by rain or the shade of the sun. The condensation on the glass panel 126 can be mentioned.

Condensation due to the first reason can be prevented by attaching the fireproof panel to the frame with a sealant or the like, and prohibiting air from entering and leaving the hollow layer T and the room. Condensation due to the second reason can be prevented by installing a ventilation port for connecting the outdoor and the hollow layer T to the frame, and ventilating using the temperature difference between the outside temperature and the hollow layer. As the exhaust means, for example, Patent Document 1 discloses a curtain wall including the exhaust means.
JP 2003-314154 A

  However, sealing and attaching the fireproof panel to the frame has not always been applicable to all curtain walls depending on construction conditions and the like. Moreover, in the curtain wall of patent document 1, it remains open unless the ventilated opening opened intentionally, and when there is a strong wind at this time, the inside of the hollow layer becomes high pressure due to the wind pressure. There was a fear. In the spandrel portion, the indoor side is formed of a fireproof panel, and depending on the strength, the fireproof panel may be damaged when the pressure inside the hollow layer becomes high.

  Then, this invention makes it a subject to provide the curtain wall which can suppress the dew condensation which arises in the hollow layer of a spandrel part simply. At this time, another object is to provide a curtain wall that can prevent damage to the constituent members of the spandrel part including the fireproof panel.

  The present invention will be described below. In order to facilitate understanding of the present invention, reference numerals in the accompanying drawings are appended in parentheses, but the present invention is not limited to the illustrated embodiment.

  The invention according to claim 1 has an opening (10) and a spandrel part (20), and the spandrel part comprises a frame (21, 24, 30) forming an outer frame of the spandrel part, and a frame. A glass panel (26) disposed inside the frame, and a frame having a predetermined gap from the glass panel and disposed on the indoor side from the glass panel, and allowing air to enter and exit between the outside and the interior of the glass panel. A curtain wall (1) comprising a fireproof panel (27) attached to a hollow layer (S) formed by being surrounded by a frame, a glass panel, and a fireproof panel, and an outdoor pressure of the hollow layer Provided is a curtain wall provided with ventilation means that allows the inflow of air from the outside into the hollow layer only when it becomes higher than the pressure by a predetermined pressure difference, and otherwise blocks the inflow of air By the above To resolve the problem.

  The invention according to claim 2 has an opening (10) and a spandrel part (20), and the spandrel part includes a frame (21, 24, 30) forming an outer frame of the spandrel part, and a frame. A glass panel (26) disposed inside the frame, and a frame having a predetermined gap from the glass panel and disposed on the indoor side from the glass panel, and allowing air to enter and exit between the outside and the interior of the glass panel. A curtain wall (1) having a fireproof panel (27) attached to a frame, a glass panel, and a hollow layer (S) formed surrounded by the fireproof panel, wherein the frame is at least A flow path (B) through the hollow layer and the outdoor is provided at one place, and the flow path is provided with an external air introduction valve (40) that enables the flow path to be blocked and opened. The outdoor pressure is the pressure of the hollow layer To solve the above problems by providing a curtain wall, wherein a flow of air into the hollow layer is allowed from outside only when the higher a predetermined pressure difference.

  According to a third aspect of the present invention, the flow path (B) and the outside air introduction valve (40) of the curtain wall (1) according to the second aspect are provided in the lower horizontal frame (24) of the frame body. Features.

  According to the present invention, the hollow layer of the spandrel portion can be ventilated with a simple structure, and the occurrence of condensation can be suppressed. Furthermore, when a large pressure difference occurs between the inside of the hollow layer and the outside of the room due to a strong wind pressure, it is possible to block the entry and exit of air into the hollow layer, thereby damaging the fireproof panel and the like due to the pressure difference. This can be prevented. In addition, when the pressure on the outdoor side or the outdoor side becomes low, the flow of air between the hollow layer and the outside is blocked, so that air humidified at high temperatures in the room is prevented from flowing into the hollow layer. This can also suppress the occurrence of condensation.

  In addition, air flows into the hollow layer from the outside air introduction valve provided in the lower horizontal frame under a predetermined condition, and the air flows out from the hollow layer between the fireproof panel and the frame. Thereby, generation | occurrence | production of dew condensation can be prevented efficiently.

  Such an operation and gain of the present invention will be made clear from the best mode for carrying out the invention described below.

  Hereinafter, the present invention will be described based on embodiments shown in the drawings.

  FIG. 1 shows the appearance of the curtain wall 1. FIG. 1A is an outdoor front view of the curtain wall 1, and FIG. 1B is a vertical sectional view. The curtain wall 1 has openings 10, 10,... Arranged at positions corresponding to the outer peripheral part of the room inside the building (so-called living space), and a spandrel part arranged at a position corresponding to the outer peripheral parts of the ceiling and floor. 20, 20,... The openings 10, 10,... And the spandrel parts 20, 20,... Are arranged in a row in the horizontal direction, and the openings 10, 10,. They are arranged alternately. In addition, the vertical end sides of the respective opening portions 10, 10,... And the spandrel portions 20, 20,. Therefore, the curtain wall 1 has a grid shape in the front view of the outdoor side due to the openings 10, 10,... And the spandrel portions 20, 20,.

  FIG. 2 is a vertical sectional view of the curtain wall 1 with attention paid to one spandrel portion 20 of the curtain wall 1. FIG. 3 is a horizontal cross-sectional view taken along the line AA in FIG. In FIG. 2, the left side of the drawing is the outdoor side, and the right side of the drawing is the indoor side. In FIG. 3, the upper side of the paper is the outdoor side, and the lower side of the paper is the indoor side. The curtain wall 1 will be further described with reference to FIGS.

  The openings 10 and 10 are disposed at portions corresponding to the building outer peripheral portion of the living space of the building, and include glass panels 11 and 11 that partition the indoor side and the outdoor side. The glass panels 11 and 11 are fixed to the openings 10 and 10 by an upper horizontal frame 21, a lower horizontal frame 24, and a vertical frame 30, which will be described later. The said glass panels 11 and 11 are comprised with the glass plate which has translucency, and can utilize the glass panel used for a normal building.

  The spandrel unit 20 includes a glass panel 26, a fireproof panel 27, an upper horizontal frame 21, a lower horizontal frame 24, a vertical frame 30, and an outside air introduction valve 40 as a frame. The spandrel part 20 is disposed above and below the opening 10 and is provided in a part corresponding to the building outer peripheral part of the building floor or ceiling. A hollow layer S is formed by a portion surrounded by the glass panel 26, the fireproof panel 27, the upper horizontal frame 21, the lower horizontal frame 24, and the vertical frame 30. Each component will be described below.

  The glass panel 26 is comprised by the glass plate which has translucency, and can utilize the glass panel used for a normal building. The said glass panel 26 is arrange | positioned facing the outdoor side, and is substantially flush with the glass panel 11 with which the opening part 10 is comprised. Thereby, the designability of a building can be improved and it becomes possible to provide the building excellent in the external appearance.

  The fireproof panel 27 is disposed on the indoor side of the glass panel 26 so as to be substantially parallel to the glass panel 26. At this time, a predetermined gap is provided between the fireproof panel 27 and the glass panel 26, and the hollow layer S is formed. The fire-resistant panel 27 is provided from the viewpoint of disaster prevention while concealing the inside of the building from the outside view. Therefore, calcium silicate is often used as a material particularly from the viewpoint of fire resistance.

  The upper horizontal frame 21 is a long member that is disposed along each of the upper sides of the four sides of the glass panel 26 and the fireproof panel 27. FIG. 4 shows a vertical cross section focusing on the portion of the upper horizontal frame 21. Accordingly, the upper horizontal frame generally extends in the back / front direction of the drawing while maintaining the cross section shown in FIG. As shown in FIG. 4, the upper horizontal frame 21 is formed by combining a first upper horizontal frame 22 on the opening 10 side and a second upper horizontal frame 23 on the spandrel part 20 side in the cross section. .

  A portion of the outdoor side at the lower part of the second upper horizontal frame 23 is formed so as to receive the upper end of the glass panel 26. And the upper end of the glass panel 26 is fixed here so that it may be clamped by bead 23a, 23b. On the other hand, an arm 23c is attached to a portion on the indoor side below the second upper horizontal frame 23, and the arm 23c is formed so as to be able to receive the upper end of the fireproof panel 27. And the upper end of the fireproof panel 27 is attached to the arm 23c, without providing a sealing material etc. Accordingly, the upper and lower ends of the glass panel 26 are blocked from entering and exiting the air by the beads 23a and 23b. Thereby, airtight watertightness is appropriately maintained before and after the glass panel 26. On the other hand, the fireproof panel 27 generally does not include a sealing material or the like. Therefore, the entrance and exit of the air before and after that is permitted by a slight gap. Specifically, as indicated by an arrow K in FIG. 4, there is a slight gap between the hollow layer S and the building interior side so that air can enter and exit. Thereby, when indoor air is air humidified at high temperature, the air flows into the hollow layer, and there is a possibility that condensation occurs on the glass panel.

  The lower horizontal frame 24 is a long member that is disposed along each of the lower sides of the four sides of the glass panel 26 and the fireproof panel 27. FIG. 5 shows a vertical cross section focusing on the lower horizontal frame 24. Therefore, the lower horizontal frame extends in the back / front direction of the drawing while maintaining the cross section shown in FIG.

  The portion of the outdoor side of the upper part of the lower horizontal frame 24 is formed so as to receive the lower end of the glass panel 26. And the lower end of the glass panel 26 is fixed here so that it may be pinched | interposed into bead 24a, 24b. Therefore, the lower end of the glass panel 26 is blocked by the beads 24a and 24b before and after the air, so that the airtight watertightness is maintained. On the other hand, a fireproof panel support member 24c is provided at the indoor side end portion of the upper portion of the lower horizontal frame 24, and the lower end portion of the fireproof panel 27 is supported by the indoor side end portion of the lower horizontal frame 24 and the fireproof panel support member 24c. ing. At this time, a sealing material or the like is generally not used at the lower end of the fireproof panel 27. Therefore, the entrance and exit of the air before and after that is permitted by a slight gap. Specifically, as indicated by an arrow L in FIG. 5, there is a slight gap between the hollow layer S and the building interior side so that air can enter and exit. Thereby, when the indoor air is air humidified at a high temperature, the air flows into the hollow layer, and there is a possibility that condensation occurs on the glass panel.

  Further, the lower horizontal frame 24 is provided with a ventilation path B through the outside and the hollow layer S as indicated by B in FIG. An outside air introduction valve 40 is disposed on the hollow layer S side of the ventilation path B. The outside air introduction valve 40 will be described later. Although the ventilation path B appears in FIG. 5, it is not provided over the full length along the longitudinal direction (back of paper surface / front side) of the lower horizontal frame 24, and is provided only in part. . As will be described later, the air in the hollow layer S is appropriately ventilated by the ventilation path B and the outside air introduction valve 40, and dew condensation can be suppressed.

  Next, the vertical frame 30 will be described with reference to FIG. The vertical frame 30 is a long member that is disposed along each of the left and right sides of the four sides of the glass panel 26 and the fireproof panel 27. Therefore, the vertical frame 30 extends in the back / front direction of the drawing while maintaining the cross section shown in FIG. Further, the vertical frame 30 is a shared member that is disposed between the adjacent openings 10 and 10 and the spandrel portions 20 and 20. The vertical frame 30 is formed so that the left vertical frame 31 and the right vertical frame 32 that are juxtaposed in the left and right are combined.

  The portion of the vertical frame 30 where the left and right ends of the glass panels 26 and 26 are disposed is formed so as to be able to receive the left and right ends of the glass panels 26 and 26. And the right and left ends of the glass panels 26 and 26 are fixed here so that it may be clamped by the beads 31a, 31b, 32a and 32b. Accordingly, the right and left ends of the glass panels 26, 26 are blocked by the beads 31a, 31b, 32a, 32b before and after the air, so that airtight watertightness is appropriately maintained. On the other hand, the arm 31c, 32c is provided in a part of the vertical frame 30 where the left and right ends of the fireproof panels 27, 27 are arranged. The arm portions 31c and 32c are formed so as to receive the left and right ends of the fireproof panels 27 and 27. At this time, the right and left ends of the fireproof panels 27 and 27 are generally not provided with a sealing material or the like. Accordingly, air can enter and exit before and after the slight gap. Specifically, as indicated by arrows M and N in FIG. 3, there is a slight gap between the hollow layer S and the building interior side so that air can enter and exit. Thereby, when the indoor air is air humidified at a high temperature, the air flows into the hollow layer, and there is a possibility that condensation occurs on the glass panel.

Further, the vertical frame 30 is provided with each part of the left vertical frame 31 and the right vertical frame 32, and a sealing material as appropriate between them, so that airtight watertightness is appropriately maintained.

  The vertical frame 30 having such a configuration is fixed to the foundation steel frame 2 of the building by a fixing member (not shown) via connecting members 33 and 34 attached to the left vertical frame 31 and the right vertical frame 32, respectively.

  Although the ventilation path B is provided in the lower horizontal frame 24 in this embodiment, the position where the ventilation path is provided is not limited to this. Examples thereof include the vertical frame 30 and the upper horizontal frame 21.

  Next, the outside air introduction valve 40 will be described. As described above, the outside air introduction valve 40 is provided in the lower horizontal frame 24. FIG. 6 is an external perspective view of the outside air introduction valve 40. 7 is a cross-sectional view of the outside air introduction valve 40, FIG. 7 (a) is a vertical cross-sectional view taken along a line indicated by EE in FIG. 6, and FIG. FIG. 7C is a vertical sectional view taken along the line GG in FIG. 6 and a vertical sectional view taken along the line GG in FIG. The outside air introduction valve 40 will be described with reference to FIGS. 6 and 7.

  The outside air introduction valve 40 includes a tubular body 41 that is a tubular body having both ends opened, a valve 45 provided inside the tubular body 41, and elastic members 48, 48, 48, and 48. ing. The cylinder 41 has a substantially rectangular shape in which a cross-sectional shape perpendicular to the axis of the cylinder is formed with semicircles at both ends. Further, protrusions 41 a and 42 a are provided on the inner wall surface of the cylindrical body 41 along the inner periphery. Accordingly, the inner opening of the cylindrical body 41 becomes narrow at the portions of the protrusions 41a and 42a. The positions of the protrusions 41 a and 42 a are such that the protrusion 41 a is substantially in the center of the cylinder 41 in the axial direction and the protrusion 42 a is the end of the cylinder 41. A method for forming the protrusions 41a and 42a on the inner side of the cylindrical body 41 is not particularly limited. In the present embodiment, from the viewpoint of ease of manufacture, the protrusion 42 a is formed on the inner side of the cylinder body 41 by inserting the protrusion member 42 having a portion that becomes the protrusion 42 a into the cylinder body 41 separately.

  Further, the cylinder body 41 has valve support members 44, 44 provided across the inner wall surfaces facing each other so as to cross the inside thereof. Two valve support members 44, 44 are arranged in parallel at a predetermined interval. The valve support members 44 and 44 are provided at substantially the same axial position as the protrusion 41 a of the cylindrical body 41. Further, the valve support members 44, 44 have through holes 44 a, 44 a that are parallel to the axial direction of the cylindrical body 41 at the approximate center in the length direction.

  The valve 45 includes a plate 46 and valve support rods 47 and 47. The plate 46 is a plate-like member having a shape substantially similar to the inner opening shape of the cylindrical body 41. The outer periphery of the plate-like plate surface is larger than the inner opening of the cylinder 41 in the portion of the projection 41a, 42a of the cylinder 41, and smaller than the inner opening of the cylinder 41 in the portion where the protrusion 41a, 42a is not provided. Has been. The valve support rods 47 and 47 are rod-like members erected on the one surface side of the plate 46 and are provided at positions corresponding to the valve support members 44 and 44. The diameters of the valve support rods 47, 47 are smaller than the diameters of the through holes 44a, 44a of the valve support members 44, 44.

  In the valve 45 having such a configuration, a portion of the plate 46 is disposed between the protrusion 41 a and the protrusion 42 a in the axial direction of the cylindrical body 41. In addition, the valve support rods 47, 47 are inserted inside the through holes 44a, 44a of the valve support members 44, 44. Therefore, the plate 46 can move between the protrusion 41a and the protrusion 42a, and can close the inner opening of the cylindrical body 41 when it is in contact with either the protrusion 41a or 42a. Become.

  When the outside air introduction valve 40 is provided in the lower horizontal frame 24, the protrusion 42 a is provided so as to be directed to the side opposite to the hollow layer S. In the present embodiment, two outside air introduction valves 40 are provided in the lower horizontal frame 24. However, this is not limited, and can be appropriately changed depending on the size of the hollow layer S or the like.

  The elastic members 48, 48, 48, 48 are members having a predetermined elastic force due to the compression thereof. Examples thereof include a spring and a foamed body having elasticity. The elastic members 48, 48, 48, 48 have one end attached to the plate 46 and the other end attached to the support members 44, 44, 44, 44. Therefore, the elastic members 48, 48, 48, 48 are biased by the position of the plate 46 of the valve 45. Specific operation of the valve will be described later.

  FIG. 8 shows another example of the outside air introduction valve. In the outside air introduction valve 40, one end of each of the elastic members 48, 48, 48, 48 is attached to the support members 44, 44, 44, 44. However, in the outside air introduction valve 40 ′ as another example, the other ends of the elastic members 48 ′, 48 ′, 48 ′, and 48 ′ are not attached to any member. Such an outside air introduction valve 40 'can be applied to the curtain wall 1 of the present invention.

  The curtain wall 1 of the present invention is formed by the configuration as described above. According to this, it turns out that it is set as the simple structure. Despite such a simple configuration, the hollow layer S can be properly ventilated, and a large load can be prevented from being applied to the fireproof panel 27.

  Next, ventilation of the hollow layer S and protection of the fireproof panel 27 will be specifically described. First, the operation of the outside air introduction valve 40 will be described. FIG. 9 is a cross-sectional view for explaining each posture of the outside air introduction valve 40. FIG. 9 is from the same viewpoint as FIG. FIG. 9A shows the posture of the outside air introduction valve 40 when there is no pressure difference before and after the outside air introduction valve 40 and no wind flows into the outside air introduction valve 40 from any direction. In such a case, the plate 46 is disposed at the lower end of the outside air introduction valve 40, and the inside is closed by the protrusion 42 a and the plate 46. In such a case, the outside and the hollow layer S are blocked by the outside air introduction valve 40.

  9A, for example, when the pressure on the upper side of the paper becomes low or the wind blows from the lower side of the paper surface, the plate 46 receives a force from the lower side of the paper to the upper side. Due to this force, the plate 46 moves upward in the drawing. At this time, as shown in FIG. 9B, a gap is formed inside the plate 46 and the cylinder 41, and air can be moved as indicated by an arrow H in FIG. 9B. While the plate 46 is moving, the elastic members 48, 48, 48, 48 are crushed, but at this time, the inside of the cylinder 41 is still open.

  Furthermore, when the pressure above the paper surface of the outside air introduction valve 40 in the posture shown in FIG. 9B decreases or a strong wind blows from below the paper surface, the plate 46 exerts a greater force from below the paper surface upward. Receive. When this force is larger than the elastic force of the elastic members 48, 48, 48, 48, the plate 46 moves upward on the paper surface against the elastic force of the elastic members 48, 48, 48, 48. Finally, the plate 46 reaches the protrusion 41a as shown in FIG. 9C, and the inside of the cylinder 41 is closed so that the outer edge of the plate 46 is caught by the protrusion 41a.

  The curtain wall 1 provided with such an outside air introduction valve 40 ventilates the hollow layer S and protects the fireproof panel 27 as follows. FIG. 10 shows a schematic diagram for explanation. 10 (a) to 10 (c) are diagrams corresponding to FIGS. 9 (a) to 9 (c), and the diagram illustrated on the right side is a vertical view of the curtain wall 1. FIG. The cross section and the flow of air are shown schematically. In the posture of the outside air introduction valve 40 shown in FIG. 10A, the inflow and outflow of air with respect to the hollow layer S are prohibited. This is the attitude of the outside air introduction valve 40 when it is normal (when the wind is low) or when the outdoor pressure is lower than that of the hollow layer S. In such a posture, for example, an air vortex is generated on the outside of the building, a wind is generated in a direction away from the building, and the pressure on the outside of the building is lower than that of the hollow layer S. Air can be prevented from blowing out. In addition, it is possible to prevent air humidified at high temperature from flowing into the hollow layer from the room. Even when the blowing force is large, the hollow layer S is not blown, and the fireproof panel 27 is not loaded. Accordingly, it is possible to prevent the fireproof panel 27 from being damaged.

  From the posture of FIG. 10A, when the wind blows toward the building and reaches a predetermined strength, the plate 46 starts to move upward. As a result, the outside air can pass through the outside air introduction valve 40, and the outside air is supplied to the hollow layer S. From the hollow layer S, air flows out from between the fireproof panel 27, the upper and lower horizontal frames 21, 24, and the vertical frame 30 to the indoor side through the passages indicated by K to N in FIGS. Thereby, the air of the hollow layer S is ventilated, and it is possible to prevent condensation on the glass panel 26. The force (pressure) at which the plate 46 begins to move is not particularly limited and can be appropriately adjusted depending on the environment and design in which the curtain wall 1 is used, but the differential pressure between the outdoor and the hollow layer S is 100 Pa or more. It is preferable. When this is converted into wind speed, it is approximately 13 m / s.

  When the strong wind blows to the building from the posture shown in FIG. 10 (b) and the wind blows from the flow passage B, and this exceeds a certain strength, the outside air introduction valve shown in FIG. 10 (c). The posture of 40 blocks the inflow of air into the hollow layer S. Thereby, it can prevent that the pressure in the hollow layer S becomes more than predetermined, and can prevent the fireproof panel 27 being damaged. There is no particular limitation on how much air is used to block outside air, but it is preferable that the pressure difference between the outdoor and the hollow layer S is 200 Pa or more. When this is converted into wind speed, it is approximately 18 m / s.

  As described above, the curtain wall 1 according to the present invention can appropriately ventilate the hollow layer S, suppress the occurrence of condensation, and also provide fire resistance by pressurizing or depressurizing the inside of the hollow layer S. Damage to the panel 27 can be prevented.

As an example, it has a length of 50 mm (FIG. 7 (a) length in the horizontal direction on the paper surface), a width of 14.4 mm (FIG. 7 (b) length in the horizontal direction on the paper surface, and a height of 12 mm (length in the vertical direction on the paper surface in FIG. 7). An experiment was conducted to obtain an equivalent opening area for the outside air introduction valve, which means an effective area for ventilation, and the equivalent opening area is expressed by αA (cm ² ). It is requested from.
αA = 2.78 (γ / 2g) ^1/2 · Q ₀ · (Δp) ^{(1 / n−0.5)} (1)

Here, each symbol is γ: air density (kg / m ³ )
Q ₀ : Air leakage amount Q (m ³ / h) when the internal / external differential pressure Δp = 1 mmAq (9.8 Pa)
g: Gravity acceleration (m / s ² )
n: Coefficient representing the gap characteristic (takes a value of 1 for laminar flow and 2 for turbulent flow)
Means.

When Q ₀ was measured for the curtain wall of the present invention, Q ₀ = 1.0946 (m ³ / h) was obtained. Substituting this into equation (1) (n = 2) and calculating αA = 0.75 (cm ² ). On the other hand, when a hole with a diameter of 10 mm is formed, αA = 0.50 (cm ² ), and when a hole with a diameter of 13 mm is formed, αA = 0.95 (cm ² ). Therefore, it was confirmed that substantially the same ventilation performance as that obtained when a hole having a diameter of 11 to 12 mm was formed by the curtain wall of the present invention and sufficient ventilation ability was provided.

  While the present invention has been described in connection with embodiments that are presently the most practical and preferred, the present invention is not limited to the embodiments disclosed herein. However, the invention can be changed as appropriate without departing from the spirit or concept of the invention that can be read from the claims and the entire specification, and curtain walls with such changes are also included in the technical scope of the present invention. Must be understood.

It is the outdoor view front view and vertical sectional view of the curtain wall of the present invention. It is the vertical sectional view of the curtain wall which paid attention to one spandrel part. It is a horizontal sectional view of a curtain wall paying attention to one spandrel part. It is the vertical sectional view which paid its attention to the upper horizontal frame part. It is the vertical sectional view which paid its attention to the lower horizontal frame part. It is an external appearance perspective view of an external air introduction valve. It is sectional drawing of an external air introduction valve. It is sectional drawing of the modification of an external air introduction valve. It is a figure for demonstrating operation | movement of an external air introduction valve. It is a figure for demonstrating prohibition of ventilation and ventilation of a hollow layer. It is the vertical sectional view which paid its attention to the spandrel part in the conventional curtain wall. It is a horizontal sectional view paying attention to the spandrel part in the conventional curtain wall.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Curtain wall 2 Basic steel frame 10 Opening part 11 Glass panel 20 Spandrel part 21 Upper horizontal frame (frame body)
22 First upper horizontal frame (frame)
23 Second upper horizontal frame (frame)
24 Lower horizontal frame (frame)
26 Glass panel 27 Fireproof panel 30 Vertical frame (frame)
31 Left vertical frame (frame)
32 Right vertical frame (frame)
33, 34 Connecting member 40, 50 Outside air introduction valve 41 Cylinder 45 Valve

Claims (3)

Having an opening and a spandrel, the spandrel
A frame forming an outer frame of the spandrel part;
A glass panel disposed inside the frame,
A curtain wall provided with a fireproof panel that is disposed on the indoor side from the glass panel with a predetermined gap from the glass panel and that is allowed to enter and exit from the outside of the room and is attached to the frame body Because
A hollow layer surrounded by the frame, the glass panel, and the fireproof panel;
Only when the outdoor pressure becomes higher than the pressure of the hollow layer with a predetermined pressure difference, the inflow of air from the outdoor to the hollow layer is allowed, and otherwise the inflow of air is blocked. And a curtain wall. Having an opening and a spandrel, the spandrel
A frame forming an outer frame of the spandrel part;
A glass panel disposed inside the frame,
A curtain wall provided with a fireproof panel that is disposed on the indoor side from the glass panel with a predetermined gap from the glass panel and that is allowed to enter and exit from the outside of the room and is attached to the frame body Because
A hollow layer surrounded by the frame, the glass panel, and the refractory panel, and the frame includes a flow path that passes through the hollow layer and the outdoors in at least one place; The flow passage is provided with an outside air introduction valve that enables the flow passage to be blocked and opened,
The outdoor air introduction valve allows air to flow from the outside into the hollow layer only when the outdoor pressure becomes higher than the pressure in the hollow layer with a predetermined pressure difference. And curtain wall.   The curtain wall according to claim 2, wherein the flow passage and the outside air introduction valve are provided in a lower horizontal frame of the frame body.

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