Condensation prevention mechanism and curtain wall

Abstract

To prevent dew condensation by suppressing a drop in temperature of a frame of a curtail wall due to outside air even when a gondola rail is formed between vertical frames of the frame.SOLUTION: Provided is a dew condensation prevention mechanism 8 including: a pair of attachment portions 81 and 82 disposed on a curtain wall 1, located on the outside of a building relative to a gondola rail 49, and formed on respective outer peripheral surfaces of adjacent vertical frames 33 facing each other; and a pair of wind guards 84 and 85 attached to the pair of attachment portions 81 and 82, respectively, located on a moving path of a gondola guide 76, extending in a height direction, and having their tips overlapped in a depth direction of the vertical frame 33, wherein the tips can be separated from each other by releasing the overlap of the tips by applying an external force from the gondola guide 76 moving in the height direction.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a condensation prevention mechanism disposed on a curtain wall, and to a curtain wall. [Background technology]

[0002] Watertight curtain walls have traditionally been used in the construction of skyscrapers and other buildings. Curtain walls are attached to the building's framework and lined up along the building's walls. Between adjacent vertical frames (mullions) of the frame that makes up the curtain wall, gondola rails are placed to allow, for example, cleaning gondolas to move up and down appropriately. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Utility Model Application Publication No. 06-051471 Summary of the Invention [Problem to be solved by the invention]

[0004] In conventional curtain walls, outside air can enter the room through the gaps between the vertical frames where the gondola rails are installed, cooling the entire frame and causing condensation on the frame. Therefore, even if a gondola rail is installed between the vertical frames that form the frame of the curtain wall, there is a problem of how to prevent condensation by suppressing the temperature drop on the frame due to the outside air. [Means for solving the problem]

[0005] The condensation prevention mechanism of the present invention, which solves the above-mentioned problems, is a condensation prevention mechanism that is arranged on a curtain wall that forms the exterior wall of a building and includes a plurality of frame bodies having vertical frames, panels that are accommodated in openings of the frame bodies, and gondola rails that are formed between the vertical frames of adjacent frame bodies and allow a gondola guide to move in the vertical direction, and is equipped with a pair of mounting portions that are located on the outdoor side of the building relative to the gondola rails and are formed on the opposing outer peripheral surfaces of adjacent vertical frames, and a pair of wind guards that are attached to the pair of mounting portions and are located on the movement path of the gondola guide, extend in the vertical direction, and have their respective tip ends overlapping in the view direction of the vertical frames, and that can be separated by the application of an external force from the gondola guide that releases the overlap of the tip ends.

[0006] The wind guard is formed of, for example, a rubber material.

[0007] The wind guard is formed of, for example, a mohair seal member.

[0008] For example, at least one of the spaces between the upper ends of the pair of wind guards extending in the height direction and between the lower ends of the pair of wind guards in the viewing direction has a notch formed therein that extends in the extension direction of the pair of wind guards and facilitates the gondola guide's entry into or exit from the pair of wind guards.

[0009] In addition, to solve the above problem, the present invention is a curtain wall that forms the exterior wall of a building and includes a frame body having vertical frames, a panel that is housed in an opening of the frame body, a gondola rail that is formed between adjacent vertical frames and allows a gondola guide to move vertically, and the condensation prevention mechanism. [Effects of the Invention]

[0010] The condensation prevention mechanism of the present invention includes a pair of wind guards located outside the building relative to the gondola rail, attached to a pair of mounting portions formed on the opposing outer peripheral surfaces of the vertical frames of adjacent frame bodies, and positioned along the path of the gondola guide. The pair of wind guards extend in the height direction of the vertical frames. When no external force is applied from the gondola guide, the leading ends of the pair of wind guards overlap in the view direction of the vertical frames, thereby preventing outside air from entering the room from the gondola rail. This prevents a temperature drop on the indoor side from the gondola rail of the vertical frames and prevents condensation. Furthermore, when the gondola guide moves vertically along the gondola rail, the pair of wind guards come into contact with the gondola guide and, upon application of external force from the gondola guide, the leading ends of the wind guards are released from overlapping and separated, allowing the gondola guide to pass between the pair of wind guards and unhindered movement of the gondola guide. [Brief explanation of the drawings]

[0011] [Figure 1] This is an example of a front view of a curtain wall, which is attached to the building's framework and forms the building's exterior wall, viewed from the outside. [Figure 2] This is a cross-sectional view of the curtain wall taken along line F1-F1 in Figure 1. [Figure 3] 1 is a cross-sectional view illustrating a pair of wind guards formed from mohair sealing members. [Figure 4] 10 is a front view illustrating V-shaped notches formed between the upper ends of a pair of wind guards in the view direction and between the lower ends in the view direction, and extending in the extension direction of the pair of wind guards. [Figure 5] 2 is a cross-sectional view of the curtain wall taken along line F1-F1 in FIG. 1, illustrating the state in which a gondola guide passes through a pair of wind guards in the height direction. DETAILED DESCRIPTION OF THE INVENTION

[0012] An embodiment of the present invention will be described below with reference to FIGS. 1 to 5. Note that components according to the embodiment and descriptions of the components may be described using multiple expressions. The components and their descriptions are merely examples and are not limited by the expressions in this specification. The components may also be identified by names different from those in this specification. Furthermore, the components may also be described using expressions different from those in this specification.

[0013] Fig. 1 is a front view showing a curtain wall 1 provided with a dew condensation prevention mechanism 8 (see Fig. 2) according to this embodiment. Fig. 2 is a cross-sectional view showing a part of the curtain wall 1 cut along line F1-F1 in Fig. 1, showing the location where two panel units 11 are adjacent in the X direction.

[0014] The curtain wall 1 shown in FIG. 1, which is a panel body, forms, for example, the exterior wall of a building (not shown). As shown in FIGS. 1 to 5, the X-axis, Y-axis, and Z-axis are defined herein for convenience. The X-axis, Y-axis, and Z-axis are perpendicular to one another. The X-axis runs along the width of the curtain wall 1, the Y-axis runs along the depth of the curtain wall 1, and the Z-axis runs along the height of the curtain wall 1. The X-direction (view direction) includes the +X-direction and the -X-direction. The Y-direction (view direction) includes the +Y-direction and the -Y-direction. The Z-direction includes the +Z-direction (upward direction) and the -Z-direction (downward direction). The +Y-direction is the direction from inside the building to outside the building, and is also referred to as the outside-side direction. The -Y-direction is the direction from outside the building to inside the building, and is also referred to as the inside-side direction.

[0015] As shown in FIG. 1, the curtain wall 1 has a plurality of panel units 11 arranged in a vertical direction (Z direction) and a front direction (X direction). The panel units 11 are pre-assembled as units before being installed on the skeleton of a building (not shown). The plurality of panel units 11 are combined with one another to form the curtain wall 1. Each of the plurality of panel units 11 is attached to the skeleton of the building (not shown) with fasteners or the like.

[0016] Each of the multiple panel units 11 has a frame body 2 and a panel 22. The panel 22 is an example of an exterior wall material. The frame body 2 has an upper horizontal frame 5, a lower horizontal frame 6, and two vertical frames 33. The upper horizontal frame 5, the lower horizontal frame 6, and the vertical frames 33 are made from shaped materials such as aluminum formed by extrusion molding or the like.

[0017] The upper horizontal frame 5 and the lower horizontal frame 6 extend substantially in the X direction. The lower horizontal frame 6 is spaced from the upper horizontal frame 5 in substantially the -Z direction. The two vertical frames 33 extend substantially in the Z direction between both ends of the upper horizontal frame 5 and both ends of the lower horizontal frame 6. The vertical frames 33 of two adjacent panel units 11 form a post.

[0018] A plurality of openings 37 are provided in the frame body 2. The openings 37 are surrounded by the upper horizontal frame 5, the vertical frame 33, and the lower horizontal frame 6. The panels 22 fitted into and housed in the openings 37 are, for example, laminated glass, but may also be single-pane glass. The panels 22 may be spaced apart from the edge (inner peripheral surface) of the openings 37.

[0019] 1 is used for cleaning the curtain wall 1. A gondola stage 71 is provided on the roof of a building (not shown), and the gondola 70 is suspended from the gondola stage 71 outside the room so as to face the curtain wall 1 in the Y direction.

[0020] A pair of gondola hoists 72 are arranged on the gondola stage 71. The pair of gondola hoists 72 are spaced a predetermined distance apart by a beam 721. The pair of gondola hoists 72 are guided by a gondola trolley rail (not shown) arranged on the gondola stage 71, and can travel along the perimeter of the building.

[0021] The gondola hoist 72 suspends the gondola 70 via a gondola suspension wire 722, and raises the gondola 70 by winding up the gondola suspension wire 722, and lowers the gondola 70 by rewinding the gondola suspension wire 722.

[0022] As shown in Fig. 2, adjacent vertical frames 33 in the X direction include, for example, an indoor-side visible wall 41 located closest to the -Y direction (indoor side), a visible wall 42 connected to the end of the indoor-side visible wall 41 on the +Y direction side (outdoor side), an outdoor-side visible wall 43 extending from the visible wall 42 to the outdoor side (+Y direction), and an outermost wall 44 located closest to the outdoor side. For convenience, in the following description, the direction in the X direction toward the center of the corresponding panel 22 shown in Fig. 2 is referred to as the inner periphery side. Furthermore, the direction in the X direction toward the outside of the corresponding panel 22 is referred to as the outer periphery side.

[0023] The indoor-side visible wall 41 is formed in a plate shape extending along the YZ plane. The indoor-side visible wall 41 has an inner circumferential surface 41a and an outer circumferential surface 41b located on the opposite side in the X direction from the inner circumferential surface 41a. Three protruding walls 456, 457, and 463 are formed on the outer circumferential surface 41b of the indoor-side visible wall 41 located on the -X direction side, and protrude toward the outer circumferential surface 41b of the indoor-side visible wall 41 on the +X direction side, and an engaging recess 450 is formed between the protruding wall 456 and the protruding wall 457.

[0024] An engagement protrusion 451 that can be inserted into the engagement recess 450 is formed on the interior-side visible wall 41 located on the +X direction side. The engagement protrusion 451 has an attachment groove, and a gasket 453 is disposed between the attachment grooves. When the engagement protrusion 451 is inserted into the engagement recess 450, the lip of the gasket 453 comes into contact with the protruding wall 456 that forms the engagement recess 450 in the Y direction. The gasket 453 is made of an elastic material such as ethylene propylene diene (EPDM) rubber, and functions as a wind barrier.

[0025] Furthermore, a protrusion 460 is formed on the indoor-side projecting wall 41 located on the +X-direction side, facing the protruding wall 463 in the Y-direction. A gasket 461 is attached to the protrusion 460, and the gasket 461 abuts against the protruding wall 463 to function as a rain barrier. The space between the gasket 461 and the gasket 453 shown in FIG. 2 forms the equal-pressure space 47. For example, the gasket 461 is formed with an equal-pressure hole (not shown) for introducing outside air into the equal-pressure space 47 and equalizing the air pressure inside the equal-pressure space 47 with the outside air pressure. The equal-pressure space 47 is a space with an air pressure equal to the air pressure outside the room (outside air) (outside air pressure).

[0026] A gondola rail 49 that allows the gondola guide 76 (see FIG. 5) to pass through is formed inside the frame body 2. In the example shown in FIG. 2, the gondola rail 49 is formed between the outer peripheral surface 41b of the indoor-side visible wall 41, the projecting wall 463, and the visible wall 42, and extends in the height direction (Z direction).

[0027] The visible wall 42 is integrally connected to the outdoor end of the indoor-side visible wall 41 and extends approximately toward the outer periphery. The distance in the facing direction between the indoor-side visible wall 41 and the indoor-side visible wall 41 is greater than the distance in the facing direction between the outdoor-side visible wall 43 and the outdoor-side visible wall 43. The visible wall 42 has an outer surface 42a that is formed approximately flat and faces the outside of the room.

[0028] For example, a gasket mounting projection is provided on the outer surface 42a of the visible wall 42, projecting toward the outside of the room. A gasket 425 is fitted onto the gasket mounting projection and attached, and the gasket 425 abuts against the inner wall surface 22a of the panel 22 that faces the room side.

[0029] The outdoor visible wall 43, formed in a plate shape extending along the YZ plane, extends in the +Y direction, which is the outdoor side, from the end on the outer periphery side of the visible wall 42. Therefore, the indoor visible wall 41, the visible wall 42, and the outdoor visible wall 43 are connected to one another in a generally stepped manner. The outdoor end of the outdoor visible wall 43 is located further outdoors than the outer wall surface 22b, which is the opposite side to the inner wall surface 22a of the panel 22.

[0030] The exterior visible wall 43 has an inner circumferential surface 43a and an outer circumferential surface 43b located on the opposite side of the inner circumferential surface 43a in the X direction. The inner circumferential surface 43a of the exterior visible wall 43 faces the lateral side edge 227 of the panel 22 in the visible direction.

[0031] Between the visible wall 42 and the plate-shaped outermost wall 44 extending along the XZ plane in the Y direction, there is formed an accommodation space 441 that accommodates the lateral side edge 227 in the visibility direction of the panel 22. A flange 438, which is an elongated member with an L-shaped cross section, is attached to the inner peripheral surface 43a of the outdoor visible wall 43, and the panel 22 is held down by the flange 438 with a gasket 439 sandwiched between the flange 438 and the outer wall surface 22b of the panel 22. The connection portions between the flange 438, the gasket 439, and the outermost wall 44 are sealed.

[0032] 2, the panel 22 is located between the visible wall 42 and the outermost wall 44, and is made of laminated glass in this embodiment. Spacers and a sealing material are disposed between the glass plates.

[0033] As shown in Fig. 2, the curtain wall 1 is equipped with a condensation prevention mechanism 8 of this embodiment. The condensation prevention mechanism 8 is located closer to the exterior of the building (in the +Y direction) than the gondola rail 49, and is equipped with a pair of mounting portions 81, 82 formed on the opposing outer peripheral surfaces 43b of adjacent vertical frames 33, and a pair of wind guards 84, 85 attached to the pair of mounting portions 81, 82, respectively, and located on the moving path in the height direction of the gondola guide 76 (see Fig. 5), extending in the height direction with their tip ends overlapping in the oblique direction of the vertical frame 33, and capable of separating when an external force is applied from the gondola guide 76 moving in the height direction, thereby releasing the overlapping of the tip ends.

[0034] In the example shown in Fig. 2, the pair of mounting portions 81, 82 are engagement grooves that are integrally formed on the outer peripheral surface 43b of the outdoor-side visible wall 43 that constitutes the vertical frame 33 and extend in the height direction (Z direction). In the example shown in Fig. 2, the pair of wind guards 84, 85 are elastically deformable gaskets made of a rubber material such as EPDM rubber. The base portions of the wind guards 84 and 85 are attached to the pair of mounting portions 81, 82, respectively, and extend in the height direction.

[0035] The lip forming the leading edge of wind guard 84 in the front direction and the lip forming the leading edge of wind guard 85 in the front direction overlap by a predetermined length in the front direction when no external force is applied, and in the example shown, the overlapping leading edges are further bent so as to protrude toward the inside of the room. The pair of wind guards 84, 85 closes the outside air path 48 formed between the adjacent outdoor exterior visible walls 43 and through which outside air flows into the room. Note that, for example, although the pair of wind guards 84, 85, which are gaskets, each have one lip forming the leading edge in the example shown, they may each have two or more lips.

[0036] Instead of the pair of wind guards 84, 85 shown in FIG. 2 , a pair of wind guards 86, 87 formed from a mohair seal member shown in FIG. 3 may be attached to the pair of mounting portions 81, 82. Each of the pair of wind guards 86, 87 has bristles 880, e.g., straight elastic resin fibers, densely packed on the opposing outer peripheral surfaces of base portions 881 attached to the pair of mounting portions 81, 82. The pair of wind guards 86, 87 extend in the height direction. The bristles 880 at the leading ends of the wind guard 86 and the bristles 880 at the leading ends of the wind guard 87 overlap by a predetermined length in the leading direction when no external force is applied, as shown in FIG. 3 . The pair of wind guards 86, 87 close the outdoor air passage 48 through which outdoor air flows indoors between the adjacent outdoor exterior walls 43.

[0037] Fig. 4 is a front view of the pair of wind guards 84, 85 shown in Fig. 2 as seen from outside the room. As shown in Fig. 4, a V-shaped notch 846 is formed between the upper end 845 of the pair of wind guards 84 and the upper end 855 of the wind guard 85 in the height direction (Z direction) of the vertical frame 33 in the view direction, extending in the -Z direction, which is the direction in which the pair of wind guards 84, 85 extend. This notch 846 serves as an entrance / exit opening for the gondola guide 76 shown in Fig. 5. Furthermore, a V-shaped notch 848 is formed between the lower end 847 of the pair of wind guards 84 and the lower end 857 of the wind guard 85 in the view direction, extending in the +Z direction, which is the direction in which the pair of wind guards 84, 85 extend. This notch 848 serves as an entrance / exit opening for the gondola guide 76 shown in Fig. 5. The space between upper ends 845 and 855 of a pair of wind guards 84, 85 in the forward direction and the space between lower ends 847 and 857 in the forward direction may be flat without a V-shaped notch, or a notch may be formed on only one of them. Furthermore, for example, notch 846 may extend in a wedge shape that narrows while curving in the -Z direction, or may extend in a semicircular or semielliptical shape. For example, notch 848 may extend in a wedge shape that narrows while curving in the +Z direction, or may extend in a semicircular or semielliptical shape.

[0038] The function and operation of the condensation prevention mechanism 8 disposed in the curtain wall 1 will be described below. In the curtain wall 1 shown in Fig. 2, the gondola guide 76 (see Fig. 5) does not enter the gondola rail 49 formed between the vertical frames 33. The lips at the respective tips of the pair of wind guards 84, 85 overlap by a predetermined length in the forward direction. Therefore, the pair of wind guards 84, 85 closes the outside air passage 48 formed between the adjacent outdoor exterior visible walls 43.

[0039] Therefore, it is possible to prevent outside air from entering the area inside the room beyond the pair of wind guards 84, 85 between the vertical frames 33, and it is possible to prevent the temperature drop from the gondola rails 49 of the vertical frames 33 on the indoor side and prevent condensation from occurring. If the curtain wall 1 were not equipped with the condensation prevention mechanism 8, for example, if the outside temperature was -10.0°C, the temperature on the indoor side from the gondola rails 49 of the vertical frames 33 would drop to -5.0°C. On the other hand, because the curtain wall 1 is equipped with the condensation prevention mechanism 8, it is possible to limit the temperature drop from the gondola rails 49 of the vertical frames 33 on the indoor side to -0.7°C.

[0040] 3 are attached to the pair of mounting portions 81, 82 shown in Fig. 2. The same effect as above can be achieved even when the pair of wind guards 86, 87 made of the mohair seal member shown in Fig. 3 are attached to the pair of mounting portions 81, 82 shown in Fig. 2. Specifically, the bristles 880 at the leading ends of the wind guards 86 and 87 overlap by a predetermined length, thereby closing the outside air passage 48 formed between the adjacent exterior exterior walls 43 and preventing outside air from entering the area inside the room between the pair of wind guards 86, 87 and between the vertical frames 33. This prevents a temperature drop on the indoor side from the gondola rails 49 of the vertical frames 33, preventing condensation.

[0041] Next, the function and operation of the condensation prevention mechanism 8 will be described when the gondola guide 76 shown in Fig. 5 moves vertically within the gondola rail 49. The gondola guide 76 is connected to the gondola 70 shown in Fig. 1. Note that Fig. 5 shows a simplified version of the gondola 70. The gondola guide 76 connected to the gondola 70 located outdoors moves up and down vertically along the gondola rail 49, fulfilling the role of reducing the swaying of the gondola 70 carrying a worker when the gondola 70 is working, as well as swaying caused by wind during work.

[0042] 5 includes a connecting bar 761 connected to the gondola 70, and a movable base 762 attached to the tip of the connecting bar 761 facing the indoor side. The connecting bar 761 extends in the Y direction for a length that runs from the outside of the room through the outdoor air passage 48 between adjacent outdoor exterior visible walls 43 and into the gondola rail 49. The movable base 762 has, for example, fitting portions (not shown) arranged on both sides in the Y direction that fit loosely into rail grooves (not shown) formed in the gondola rail 49, and slides vertically within the gondola rail 49 that extends vertically.

[0043] For example, on the rooftop of a building (not shown) on which the curtain wall 1 shown in Figures 1 and 5 is disposed, there are provided gondola rails 49 formed between adjacent vertical frames 33 of the curtain wall 1, and an entrance that allows access from the height direction to the outside air duct 48. Then, together with the gondola 70 that is lowered outdoors by the gondola hoist 72 shown in Figure 1, a connecting bar 761 descends and enters the outside air duct 48 shown in Figure 5 from the upper end in the height direction of the outside air duct 48. As the connecting bar 761 enters, a movable base 762 descends and enters the gondola rail 49.

[0044] Here, the connecting bar 761, which enters the outside air passage 48 while descending in the height direction as shown in Fig. 5, comes into contact with the pair of wind guards 84, 85 from the entrance / exit opening 846 (see Fig. 4) at the upper ends 845 of the pair of wind guards 84, 85 and applies an external force (pressing force), causing the tips of the pair of wind guards 84, 85, which are made of, for example, EPDM rubber, to deform so as to release the overlap, and the tips move apart in the forward direction, as shown in Fig. 5. Therefore, the connecting bar 761 can enter between the wind guards 84 and 85, and the movement of the gondola guide 76 descending inside the gondola rail 49 is not hindered.

[0045] In the dew condensation prevention mechanism 8 of the present embodiment, a V-shaped notch 846 extending in the −Z direction, which is the extension direction of the pair of wind guards 84, 85, is formed as an entrance / exit opening between the upper end 845 of the pair of wind guards 84 and the upper end 855 of the pair of wind guards 85 in the front direction, so that the connecting bar 761 is less likely to get caught when entering between the upper end 845 and the upper end 855 shown in Fig. 5 than if the upper ends 845 and 855 were flat. In other words, the connecting bar 761 can enter between the wind guards 84 and 85 more smoothly in the height direction.

[0046] 4 of the pair of wind guards 84 and the lower end 857 of the pair of wind guards 85, a V-shaped notch 848 facing in the +Z direction, which is the extension direction of the pair of wind guards 84, 85, is formed as an entrance / exit opening, so that the connecting bar 761 is less likely to get caught when exiting between the lower ends 847 and 857 than if the lower ends 847 and 857 were flat. In other words, the connecting bar 761, which passes between the wind guards 84 and 85 while descending, can exit the pair of wind guards 84, 85 more smoothly.

[0047] 5, when the connecting bar 761 enters between the pair of wind guards 84, 85 from the height direction, the spaced-apart tips of the pair of wind guards 84, 85, which are made of rubber, come into contact while curving along the outer circumferential surface of the connecting bar 761. Therefore, even while the gondola guide 76 is descending inside the gondola rail 49, the outside air path 48 between the adjacent outside visible walls 43 is almost closed to outside air. This prevents outside air from entering the area inside the room beyond the pair of wind guards 84, 85 between the vertical frames 33, suppressing a drop in temperature inside the room from the gondola rail 49 of the vertical frame 33 and preventing condensation from occurring.

[0048] 3 is attached to the pair of mounting portions 81, 82, the connecting bar 761, which enters the outside air passage 48 while descending in the height direction, comes into contact with the pair of wind guards 86, 87 from the upper ends of the pair of wind guards 86, 87 and applies an external force, causing the bristles 880 at the tips of the pair of wind guards 86, 87 to deform so as to release the overlap, and the bristles 880 move apart in the forward direction. Therefore, the connecting bar 761 can enter between the wind guards 86 and 87, and the movement of the gondola guide 76 descending within the gondola rail 49 is not hindered.

[0049] Furthermore, when the connecting bar 761 enters between the pair of wind guards 86, 87, each bristle portion 880 curves along the outer circumferential surface of the connecting bar 761 and makes contact with it. Therefore, even while the gondola guide 76 is descending inside the gondola rail 49, the outside air passage 48 formed between the adjacent outdoor exterior visible walls 43 is almost closed to the outside air. This makes it possible to prevent outside air from entering the area inside the room between the pair of wind guards 86, 87 and between the vertical frames 33, thereby suppressing a drop in temperature inside the room from the gondola rail 49 of the vertical frame 33 and suppressing the occurrence of condensation.

[0050] The Sustainable Development Goals (SDGs) are 17 international goals adopted at the United Nations Summit in September 2015. The condensation prevention mechanism 8 and curtain wall 1 according to this embodiment can contribute to achieving one of the 17 SDGs, for example, goal 11, "Sustainable Cities and Communities." Although the embodiments of the present invention have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. This novel embodiment can be embodied in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit and scope of the invention. The embodiments and their modifications are within the scope and spirit of the invention, as well as within the scope of the claims and their equivalents. [Explanation of symbols]

[0051] 1: Curtain wall 11: Panel unit 2: Frame 22: Panel 33: Vertical frame 37: Opening 41: Indoor and outdoor visible wall 42: Attached wall 43: Outdoor visible wall 44: Outermost wall 453: Gasket (wind barrier) 461: Gasket (Rain Barrier) 47: Isobaric space 48: Outside air passage 49: Gondola Rail 5: Upper horizontal frame 6: Bottom horizontal frame 70: Gondola 71: Gondola stage 72: Gondola hoist 76: Gondola guide 761: Connecting bar 762: Movable base 8: Condensation prevention mechanism 81, 82: A pair of mounting parts 84, 85: A pair of wind guards made of rubber 86, 87: A pair of wind guards formed of mohair sealing members

Claims

1. A condensation prevention mechanism is provided on a curtain wall that forms the outer wall of a building and includes: a plurality of frame bodies having vertical frames; a panel that is housed in an opening of the frame body; and a gondola rail that is formed between the vertical frames of adjacent frame bodies and that allows a gondola guide to move in the height direction. A pair of mounting portions are located outside the building relative to the gondola rail and are formed on the outer peripheral surfaces of the adjacent vertical frames facing each other; A condensation prevention mechanism comprising a pair of wind guards attached to the pair of mounting portions, positioned on the movement path of the gondola guide, extending in the height direction and with their respective tip ends overlapping in the view direction of the vertical frame, and which are capable of separating when an external force is applied from the gondola guide moving in the height direction, thereby releasing the overlap of the tip ends.

2. 2. The dew condensation prevention mechanism according to claim 1, wherein the wind guard is made of a rubber material.

3. 2. The condensation prevention mechanism of claim 1, wherein the wind guard is formed of a mohair seal member.

4. A condensation prevention mechanism as described in claim 1, wherein a notch extending in the extension direction of the pair of wind guards is formed at least in one of the areas between the upper ends of the pair of wind guards in the viewing direction and between the lower ends of the pair of wind guards in the viewing direction, the notch extending in the extension direction of the pair of wind guards to facilitate the gondola guide's entry into or exit from the pair of wind guards.

5. A curtain wall that forms the exterior wall of a building and comprises a frame body having vertical frames, a panel that is accommodated in an opening of the frame body, a gondola rail formed between adjacent vertical frames that allows a gondola guide to move in the vertical direction, and a condensation prevention mechanism described in any one of claims 1 to 4.

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