JP2024172322A - Curtain Wall Unit - Google Patents

Abstract

To provide a curtain wall unit preventing drainage from a hollow layer provided in a spandrel part of the curtain wall unit to an outdoor space while suppressing condensation within the hollow layer.SOLUTION: A curtain wall unit 2 is provided with a hollow layer 22 formed between an outdoor side panel body 20 and an indoor side panel body 21 of a spandrel part 2A, forming an isotropic pressure space 17 as an outdoor space 15 with frame bodies 3 adjacent to each other in a right/left direction S, when two units are aligned in the right/left direction S side by side. The frame body 3 has vertical frames 6 positioned at both of the right and left sides of the hollow layer 22 to form the isotropic pressure space 17. The vertical frame 6 comprises: a first communication hole 70 communicating the isotropic pressure space 17 with the hollow layer 22 for ventilation and discharging water toward the isotropic pressure space 17; and a second communication hole 71 positioned outside of the isotropic pressure space 17 to communicate a ventilation space 18 in communication with the outdoor space 15 with the hollow layer 22 for ventilation.SELECTED DRAWING: Figure 5

Description

The present invention relates to a curtain wall unit in which a hollow layer is provided in the spandrel section.

In a curtain wall unit with a hollow layer in the spandrel section, two panels in the spandrel section are held by a frame body, and a hollow layer is formed between the two panels. In such a hollow layer, condensation may occur inside the hollow layer due to factors such as the humidity inside the hollow layer and the temperature difference between the inside and outside of the hollow layer. In response to this, a curtain wall has been known that uses an air intake and condensation outlet hole in the lower interlocking material and an exhaust hole in the upper interlocking material in the spandrel section to suppress condensation in the enclosed space that is the hollow layer (see Patent Document 1).

In the conventional curtain wall described in Patent Document 1, air in the atmosphere flows into the sealed space through the air intake and condensation outlet holes, and the air in the sealed space is exhausted through the exhaust holes. This brings the temperature of the sealed space closer to the atmospheric temperature, suppressing condensation. When condensation occurs in the sealed space, the condensed water is exhausted to the atmosphere through the air intake and condensation outlet holes. However, the condensed water is exhausted through the air intake and condensation outlet holes to the outdoor space located on the outdoor side of the curtain wall. As a result, depending on the atmospheric temperature, there is a risk that the water exhausted from the air intake and condensation outlet holes on the outdoor side of the curtain wall will freeze. In addition, in cold regions, there is a concern that icicles will form due to the frozen water. For this reason, in conventional curtain walls, it is necessary to deal with drainage from the sealed space to the outdoor space.

Japanese Utility Model Application Publication No. 59-157013

The present invention was developed in consideration of the above-mentioned problems of the conventional technology, and its purpose is to prevent water from draining from the hollow layer into the outdoor space while suppressing the occurrence of condensation inside the hollow layer provided in the spandrel portion of the curtain wall unit.

The present invention relates to
A curtain wall unit comprising: a frame body; an outdoor panel body and an indoor panel body provided in a spandrel portion and held by the frame body; and a hollow layer formed between the outdoor panel body and the indoor panel body, the frame bodies adjacent to each other in the left-right direction forming an isopressure space having the same pressure as the outdoor space when the curtain wall unit is installed side by side in the left-right direction,
the frame body has vertical frames positioned on both the left and right sides of the hollow layer to form the isobaric space,
The vertical frame is a curtain wall unit having a first communication hole that connects the isobaric space with the hollow layer to allow ventilation and drains water toward the isobaric space, and a second communication hole that connects the hollow layer with a ventilation space located outside the isobaric space and ventilating with the outdoor space to allow ventilation.

According to the present invention, it is possible to suppress the occurrence of condensation inside the hollow layer provided in the spandrel portion of the curtain wall unit while preventing water from draining from the hollow layer into the outdoor space.

FIG. 2 is a front view showing the curtain wall of the first embodiment. FIG. 2 is a vertical cross-sectional view showing the curtain wall of the first embodiment. FIG. 2 is a cross-sectional view showing the curtain wall of the first embodiment. FIG. 2 is a vertical cross-sectional view showing the spandrel portion of the curtain wall unit of the first embodiment. FIG. 2 is a cross-sectional view showing the spandrel portion of the curtain wall unit of the first embodiment. A vertical cross-sectional view showing the spandrel portion of the curtain wall unit of the second embodiment. A cross-sectional view showing the spandrel portion of the curtain wall unit of the second embodiment. A vertical cross-sectional view showing the spandrel portion of the curtain wall unit of the third embodiment. A cross-sectional view showing the spandrel portion of the curtain wall unit of the third embodiment. A vertical cross-sectional view showing the spandrel portion of the curtain wall unit of the fourth embodiment. A cross-sectional view showing the spandrel portion of the curtain wall unit of the fourth embodiment. A vertical cross-sectional view showing the spandrel portion of the curtain wall unit of the fifth embodiment. A cross-sectional view showing the spandrel portion of the curtain wall unit of the fifth embodiment.

An embodiment of the curtain wall unit of the present invention will be described with reference to the drawings.
The curtain wall unit of the present embodiment is used for the curtain wall of a building and is installed on the exterior wall of the building. A plurality of curtain wall units are combined with each other to form a part of the curtain wall. The curtain wall unit and the curtain wall are installed on the exterior wall of the building between the indoor (indoor) and outdoor (outdoor) of the building to form the exterior wall of the building.

First Embodiment
Fig. 1 is a front view showing the curtain wall 1 of the first embodiment, showing a part of the curtain wall 1 installed in a building 10 and a curtain wall unit 2 as viewed from the outdoor side. Fig. 2 is a vertical cross-sectional view showing the curtain wall 1 of the first embodiment, showing the curtain wall 1 cut along a plane including the up-down direction R and the indoor-outdoor direction T, and a part of the building 10. Fig. 3 is a horizontal cross-sectional view showing the curtain wall 1 of the first embodiment, showing the curtain wall 1 cut along a plane including the left-right direction S and the indoor-outdoor direction T.

When the curtain wall 1 and curtain wall unit 2 installed on the building 10 are viewed from the front, the up-down direction is the up-down direction R, and the left-right direction is the left-right direction S. In FIG. 1, the up-down direction R is the vertical direction, and the left-right direction S is the horizontal direction. The indoor-outdoor direction T is the indoor-outdoor direction (indoor-outdoor direction) of the curtain wall 1 and curtain wall unit 2 installed on the building 10. In addition, the indoor-outdoor direction T is the front-back direction (depth direction) when the curtain wall 1 and curtain wall unit 2 installed on the building 10 are viewed from the front, and in FIG. 1, it is the horizontal direction perpendicular to the left-right direction S. In this way, the directions related to the curtain wall 1 and curtain wall unit 2 are specified by the directions when they are installed on the building 10. In addition, the indoor side and the outdoor side of the curtain wall 1 and curtain wall unit 2 are the indoor side and the outdoor side when they are installed on the building 10.

As shown in the figure, the building 10 comprises a curtain wall 1, a structure 11, a boundary portion 12 between the upper and lower floors of the building 10, and floor portions 13 of each floor of the building 10. The structure 11, boundary portion 12, and floor portions 13 of the building 10 are located on the indoor side of the curtain wall 1 and the curtain wall unit 2. The structure 11 is a mounting body to which the curtain wall 1 and the curtain wall unit 2 are attached. The boundary portion 12 is a portion located at the boundary between the upper and lower floors of the building 10, and is located between the floor portion 13 of the upper floor and the floor portion 13 of the lower floor. The floor portion 13 is an indoor used portion of the building 10, and is located between the upper and lower boundary portions 12.

The curtain wall 1 comprises a number of curtain wall units 2 that are installed side by side on the building 10. The curtain wall units 2 are units that make up the curtain wall 1, and are pre-assembled before installation on the building 10. The curtain wall 1 and the curtain wall units 2 are installed at locations on the exterior wall 14 of the building 10, and form the exterior wall 14 of the building 10. The curtain wall units 2 are installed side by side in the vertical direction R and the horizontal direction S, and are combined with adjacent curtain wall units 2.

The curtain wall 1 and the curtain wall unit 2 are disposed on the outdoor side of the structure 11 of the building 10 and attached to the structure 11 of the building 10. In this state, the curtain wall 1 and the curtain wall unit 2 are located between the boundary portion 12 of the building 10 and the outdoor space 15, and between the floor portion 13 of the building 10 and the outdoor space 15, and are exposed to the outside air. The outdoor space 15 is the space outside the building 10, the curtain wall 1, and the curtain wall unit 2, and the outside air is the air in the outdoor space 15.

The curtain wall unit 2 comprises a spandrel section 2A and a vision section 2B adjacent to each other in the vertical direction R, and a frame body 3 that partitions an opening 3A in the spandrel section 2A and an opening 3B in the vision section 2B. The spandrel sections 2A and the vision sections 2B are arranged vertically in the curtain wall unit 2, adjacent to each other in each curtain wall unit 2, and adjacent to each other between curtain wall units 2 adjacent to each other in the vertical direction R. The spandrel sections 2A and the vision sections 2B are arranged alternately in the vertical direction R in the curtain wall 1, and are arranged side by side in the left-right direction S, respectively.

The spandrel portion 2A is a lower portion located on the outdoor side of the boundary portion 12 of the building 10, and is provided on one side of the curtain wall unit 2 in the vertical direction R. The vision portion 2B is a window portion located on the outdoor side of the floor portion 13 of the building 10, and is provided on the other side of the curtain wall unit 2 in the vertical direction R. Here, the spandrel portion 2A is the upper portion of the curtain wall unit 2, and is located above the vision portion 2B. Also, the vision portion 2B is the lower portion of the curtain wall unit 2, and is located below the spandrel portion 2A. The spandrel portion 2A is located between the boundary portion 12 of the building 10 (indoor space 12A of the boundary portion 12) and the outdoor space 15 in the indoor/outdoor direction T, and faces the boundary portion 12. The vision portion 2B is located between the floor portion 13 of the building 10 (indoor space 13A of the floor portion 13) and the outdoor space 15 in the indoor/outdoor direction T, and faces the floor portion 13.

The frame body 3 is a rectangular opening frame, and is provided in the spandrel portion 2A and the vision portion 2B of the curtain wall unit 2. The frame body 3 is disposed on the outdoor side of the frame 11 of the building 10 and attached to the frame 11 of the building 10. The frame bodies 3 of the multiple curtain wall units 2 are installed side by side in the vertical direction R and the horizontal direction S, and are combined with the frame bodies 3 of the adjacent curtain wall units 2. The frame body 3 forms an opening 3A in the spandrel portion 2A and an opening 3B in the vision portion 2B. The opening 3A in the spandrel portion 2A is an upper opening of the frame body 3, located above the opening 3B in the vision portion 2B, and formed at a distance upward from the opening 3B in the vision portion 2B. The opening 3B in the vision portion 2B is a lower opening of the frame body 3, located below the opening 3B in the spandrel portion 2A, and formed at a distance downward from the opening 3A in the spandrel portion 2A.

The frame 3 has four interlocking frames 4-6 (upper frame 4, lower frame 5, and a pair of vertical frames 6) and a lintel 7, and the frames 4-6 and lintel 7 form square openings 3A and 3B. The frames 4-6 and lintel 7 of the frame 3 are frame components that make up the frame 3, and each is made of a metal (e.g., aluminum alloy) shaped member formed by extrusion molding. The upper frame 4, lower frame 5, and lintel 7 are horizontal members that extend horizontally (left-right direction S), and the pair of vertical frames 6 are vertical members that extend vertically (up-down direction R). The upper frame 4 and lower frame 5 are located at the top and bottom of the frame 3, and the pair of vertical frames 6 are located on the left and right sides of the frame 3. The ends of the upper frame 4, lower frame 5, and the pair of vertical frames 6 are connected to form the frame of the frames 4-6.

The crosspiece 7 is a central horizontal frame located in the middle of the frame body 3 in the vertical direction R, and is located between the upper frame 4 and the lower frame 5 and connected to a pair of vertical frames 6. The crosspiece 7 is installed on the pair of vertical frames 6, and divides the inside of the frame body 3 (openings 3A, 3B) into upper and lower parts. The spandrel section 2A and the opening 3A are divided by the upper frame 4 of the frame body 3, a pair of vertical frames 6, and the crosspiece 7, and the opening 3A is surrounded by the upper frame 4 of the frame body 3, a pair of vertical frames 6, and the crosspiece 7. The vision section 2B and the opening 3B are divided by the lower frame 5 of the frame body 3, a pair of vertical frames 6, and the crosspiece 7, and the opening 3B is surrounded by the lower frame 5 of the frame body 3, a pair of vertical frames 6, and the crosspiece 7.

FIG. 4 is a vertical cross-sectional view showing the spandrel portion 2A of the curtain wall unit 2 of the first embodiment, and shows an enlarged view of a portion including the spandrel portion 2A in FIG.
As shown in the figure, the curtain wall unit 2 comprises two panel bodies 20, 21 (an outdoor panel body 20 and an indoor panel body 21) provided in a spandrel portion 2A, and a hollow layer 22. The panel bodies 20, 21 are rectangular panel-like members, and are arranged in an opening 3A of the spandrel portion 2A of a frame body 3 and held by the frame body 3.

In the spandrel section 2A, the curtain wall unit 2 and the frame body 3 are installed between the outdoor space 15 and the indoor space 12A at the boundary portion 12 of the building 10. The outdoor panel body 20 is located on the outdoor side (the outdoor space 15 side), and the indoor panel body 21 is located on the indoor side (the indoor space 12A side). The outdoor panel body 20 is a glass panel body (e.g., laminated glass, plate glass, or double-glazed glass) and is provided on the outdoor side of the opening 3A. The indoor panel body 21 is a back panel (e.g., a fireproof panel, a metal panel) and is provided on the indoor side of the opening 3A.

The panel bodies 20 and 21 are fixed panel bodies, and are each fixed to an opening 3A of the spandrel section 2A of the frame body 3. In the spandrel section 2A, the panel bodies 20 and 21 are surrounded by the upper frame 4, a pair of vertical frames 6, and a transom 7 of the frame body 3, and are attached to the upper frame 4, a pair of vertical frames 6, and a transom 7. As a result, the panel bodies 20 and 21 are held by the upper frame 4, a pair of vertical frames 6, and a transom 7, and fixed to the frame body 3. The outdoor panel body 20 and the indoor panel body 21 are arranged at a distance in the indoor/outdoor direction T, and face each other in the indoor/outdoor direction T with a hollow layer 22 between them.

The hollow layer 22 is a space (spandrel space) provided in the spandrel section 2A, and is formed between the outdoor panel body 20 and the indoor panel body 21 at the opening 3A of the spandrel section 2A in the indoor-outdoor direction T. The hollow layer 22 is located on the indoor side of the outdoor panel body 20 and on the outdoor side of the indoor panel body 21, and is surrounded by the frame body 3 and formed inside the frame body 3 (opening 3A). The outdoor panel body 20 is located on the outdoor side of the indoor panel body 21 and the hollow layer 22, and between the outdoor space 15 and the hollow layer 22, and the indoor panel body 21 is located on the indoor side of the outdoor panel body 20 and the hollow layer 22, and between the boundary part 12 of the building 10 (indoor space 12A) and the hollow layer 22.

The hollow layer 22 is surrounded by the upper frame 4, the lattice 7, and a pair of vertical frames 6 of the frame body 3 in the vertical direction R, and is formed between the upper frame 4 and the lattice 7, and between the pair of vertical frames 6 in the horizontal direction S. The upper frame 4 is located above the panel bodies 20, 21 and the hollow layer 22, and holds the upper edge of the panel bodies 20, 21 to define the upper edge of the hollow layer 22. The lattice 7 is located below the panel bodies 20, 21 and the hollow layer 22, and holds the lower edge of the panel bodies 20, 21 to define the lower edge of the hollow layer 22. The pair of vertical frames 6 are located on both the left and right sides of the panel bodies 20, 21 and the hollow layer 22, and holds the left and right vertical edges of the panel bodies 20, 21 above the lattice 7 to define the left and right vertical edges of the hollow layer 22.

In the spandrel portion 2A of the curtain wall unit 2, the hollow layer 22 is located above the hollow gable 7. The gable 7 is arranged between a pair of vertical frames 6 in the left-right direction S, and the end of the gable 7 in the longitudinal direction (left-right direction S) contacts the vertical frames 6. The gable 7 also has a gable body 30 that defines the lower edge of the hollow layer 22, and a horizontal batten 40 attached to the gable body 30. The gable body 30 is a hollow main body that constitutes the main body of the gable 7, and holds the panel bodies 20 and 21. The horizontal batten 40 is a batten that extends in the horizontal direction (gable batten), and is located on the outdoor side of the gable body 30 and holds the outdoor panel body 20. The outdoor panel body 20 (the lower edge of the outdoor panel body 20) is arranged between the gable body 30 and the horizontal batten 40 in the indoor-outdoor direction T, and is held between the gable body 30 and the horizontal batten 40.

The gable body 30 of the gable 7 has an inclined surface portion 31 that is inclined with respect to the horizontal plane. The inclined surface portion 31 is the upper surface of the gable body 30 and the gable 7, and is located on the indoor side of the outdoor panel body 20 and on the outdoor side of the indoor panel body 21. The inclined surface portion 31 is located below the hollow layer 22 and faces the hollow layer 22. When viewed in a cross section perpendicular to the longitudinal direction of the gable 7, the inclined surface portion 31 is inclined with respect to the horizontal direction (indoor/outdoor direction T) and is inclined diagonally downward from each of the outdoor end and the indoor end toward the middle part in the indoor/outdoor direction T. The inclined surface portion 31 is located between the outdoor panel body 20 and the indoor panel body 21, and contacts the vertical frame 6 at the longitudinal end of the gable 7.

FIG. 5 is a cross-sectional view showing the spandrel portion 2A of the curtain wall unit 2 of the first embodiment, showing the portions where two curtain wall units 2 on the left and right are adjacent to each other.
As shown in the figure, a plurality of curtain wall units 2 and frame bodies 3 are installed side by side in the left-right direction S on the exterior wall 14 of the building 10. The left and right curtain wall units 2 and frame bodies 3 installed side by side in the left-right direction S are adjacent to each other in the left-right direction S. In addition, the vertical frames 6 of the frame bodies 3 of the left and right curtain wall units 2 adjacent to each other in the left-right direction S are disposed with an interval in the left-right direction S, adjacent to each other in the left-right direction S, and facing each other in the left-right direction S.

When the curtain wall units 2 are installed side by side in the left-right direction S, the frame bodies 3 and vertical frames 6 adjacent to each other in the left-right direction S form a joint space 16, and also form an isopressure space 17 that is equal in pressure to the outdoor space 15. The joint space 16 is a space (gap) formed in the joint (vertical joint) between the frame bodies 3 and vertical frames 6 of the curtain wall units 2 adjacent to each other in the left-right direction S, and is located on the outdoor side of the isopressure space 17. The isopressure space 17 is a space that is equal in pressure to the air pressure (outside air pressure) of the outdoor space 15 (outside air), and is located on the indoor side of the joint space 16.

The joint space 16 and the equal pressure space 17 are formed between the frame body 3 and the vertical frame 6 of the curtain wall units 2 adjacent in the left-right direction S, and extend along the vertical frame 6 in the longitudinal direction (up-down direction R) of the vertical frame 6. The joint space 16 is closed at a location on the indoor side of the outdoor panel body 20 and opens toward the outdoor space 15, communicating with and ventilating the outdoor space 15.

The equal-pressure space 17 is closed at both the outdoor location (the indoor location of the joint space 16) and the indoor location (the location separated from the joint space 16 to the indoor side). The equal-pressure space 17 also communicates with an equal-pressure space (not shown) formed between the frame bodies 3 of the curtain wall units 2 adjacent in the up-down direction R at the lower end of the vertical frame 6, and also communicates with the outdoor space 15 via a communication part (not shown). The left and right vertical frames 6 adjacent in the left-right direction S form a joint space 16 and an equal-pressure space 17 between them, and face each other in the left-right direction S with the joint space 16 and the equal-pressure space 17 between them.

In the spandrel portion 2A of the curtain wall unit 2, the hollow layer 22 is located between a pair of hollow vertical frames 6. The vertical frames 6 have a vertical frame body 50 that defines the vertical edge of the hollow layer 22, a vertical batten 60 attached to the vertical frame body 50, a mounting groove portion 61 into which the outdoor panel body 20 is attached, a retaining material 62 that holds the outdoor panel body 20, and internal spaces 63, 64. The vertical frame body 50 is a hollow main body portion that constitutes the main body of the vertical frame 6, and holds the indoor panel body 21.

The vertical frame body 50 of the vertical frame 6 has a projection portion 51, a fitting portion 52 located on the equal pressure space 17 side of the projection portion 51, and a hollow portion 53 located on the joint space 16 side of the projection portion 51. The projection portion 51 is disposed along the projection direction (indoor-outdoor direction T) of the vertical frame 6 between the indoor end of the vertical frame body 50 and the mounting groove portion 61. The projection portion 51 is also located to the side of the hollow layer 22 in the left-right direction S and faces the hollow layer 22. The fitting portion 52 extends in the longitudinal direction of the vertical frame 6 and protrudes from the projection portion 51 toward the side of the frame body 3 in the left-right direction S.

The fitting portion 52 has two fitting walls 52A, 52B (outdoor fitting wall 52A, indoor fitting wall 52B). The outdoor fitting wall 52A and the indoor fitting wall 52B are parallel and spaced apart in the indoor/outdoor direction T, and face each other in the indoor/outdoor direction T. In the vertical frames 6 of the curtain wall units 2 adjacent in the left-right direction S, the fitting portion 52 and fitting walls 52A, 52B of the vertical frame 6 of one curtain wall unit 2 are arranged within the fitting portion 52 of the vertical frame 6 of the other curtain wall unit 2, and between the two fitting walls 52A, 52B of the fitting portion 52. As a result, the fitting portions 52 of the vertical frames 6 adjacent in the left-right direction S fit into each other.

The outdoor-side mating walls 52A of the two mating parts 52 that fit together have a watertight material 54, which acts as a rain barrier, sandwiched between them, and the space between them is sealed by the watertight material 54. The indoor-side mating walls 52B of the two mating parts 52 that fit together have an airtight material 55, which acts as a wind barrier, sandwiched between them, and the space between them is sealed by the airtight material 55. The curtain wall units 2 adjacent in the left-right direction S are installed by fitting the mating parts 52 of their vertical frames 6 together, and form an equal-pressure space 17 at the places inside the mating parts 52 that fit together.

The equal-pressure space 17 is surrounded by the projection portion 51 and the fitting portion 52 (fitting walls 52A, 52B) of the vertical frame body 50 adjacent in the left-right direction S. The outdoor fitting wall 52A of the fitting portion 52 is a partition portion located between the equal-pressure space 17 and the joint space 16, and separates the equal-pressure space 17 from the joint space 16, and also separates the joint space 16 on the indoor side. The joint space 16 is partitioned and closed at the outdoor side of the equal-pressure space 17 by the outdoor fitting wall 52A (partition portion). The hollow portion 53 is provided between the fitting portion 52 (outdoor fitting wall 52A) and the mounting groove portion 61 in the indoor-outdoor direction T, and is located on the outdoor side of the equal-pressure space 17 and between the hollow layer 22 and the joint space 16.

The vertical battens 60 are battens (vertical frame battens) that extend vertically and are located on the outdoor side of the vertical frame body 50. The vertical battens 60 are also arranged from the vertical frame body 50 to the outdoor side of the outdoor panel body 20 to hold the outdoor panel body 20. The mounting groove 61 of the vertical frame 6 is a holding groove that holds the outdoor panel body 20 (the vertical edge of the outdoor panel body 20) and extends in the longitudinal direction of the vertical frame 6. The mounting groove 61 is formed in a concave shape by the vertical frame body 50 and the vertical battens 60, and is open in the left-right direction S toward the opening 3A of the spandrel portion 2A. The outdoor panel body 20 is arranged in the mounting groove 61 and is mounted and held in the mounting groove 61.

The retaining material 62 is an adjustment material that adjusts the width of the mounting groove 61 in the indoor/outdoor direction T, and is disposed within and attached to the mounting groove 61. The retaining material 62 is also disposed between the outdoor panel body 20 (indoor side surface) and the vertical frame body 50 in the indoor/outdoor direction T, and is fixed to the vertical frame body 50 by screws 65. The retaining material 62 is located to the side of the hollow layer 22 in the left-right direction S, and faces the hollow layer 22.

The vertical frame 6 holds the outdoor panel body 20 on the outdoor side by a vertical batten 60 located on the outdoor side of the outdoor panel body 20 (the vertical edge of the outdoor panel body 20). The vertical frame 6 also holds the outdoor panel body 20 on the indoor side by a retaining material 62 located on the indoor side of the outdoor panel body 20. The outdoor panel body 20 is positioned between the retaining material 62 and the vertical batten 60 in the indoor/outdoor direction T, and is held between the retaining material 62 and the vertical batten 60.

At least one (one or more) internal spaces 63, 64 are formed in the vertical frame 6. Here, the vertical frame 6 has two internal spaces 63, 64 (first internal space 63, second internal space 64) located on the outdoor side of the isobaric space 17. The internal spaces 63, 64 are formed inside the vertical frame 6 and are located between the isobaric space 17 and the outdoor panel body 20 in the indoor/outdoor direction T. The internal spaces 63, 64 communicate with the outdoor space 15 via a communication port (not shown) provided at the lower part of the spandrel portion 2A in the vertical frame 6 or at the lower end of the vertical frame 6.

The first internal space 63 is the space within the mounting groove 61 of the vertical frame 6 (here, the area located inside the retaining material 62), and is formed between the retaining material 62 and the vertical frame body 50, and is surrounded by the retaining material 62 and the vertical frame body 50. The second internal space 64 is the space within the hollow portion 53 of the vertical frame body 50, and is formed between the fitting portion 52 (outdoor fitting wall 52A) and the mounting groove 61 in the indoor/outdoor direction T. The internal spaces 63, 64 are located between the hollow layer 22 and the joint space 16 in the left-right direction S.

In the indoor/outdoor direction T, the first internal space 63 is an outdoor internal space located on the outdoor side of the second internal space 64, and is located between the second internal space 64 and the outdoor panel body 20. The second internal space 64 is an indoor internal space located on the indoor side of the first internal space 63, and is located between the equal pressure space 17 and the first internal space 63. In the left-right direction S, the retaining material 62 is located between the hollow layer 22 and the first internal space 63, and the projection portion 51 of the vertical frame body 50 is located between the hollow layer 22 and the second internal space 64. The internal spaces 63, 64 are located on the outdoor side of the equal pressure space 17, inside the vertical frame 6, and communicate with the outdoor space 15 to ventilate between them.

As shown in Figures 4 and 5, the vertical frame 6 has two communication holes 70, 71 (first communication hole 70, second communication hole 71) that connect the hollow layer 22 to the outside space. The first communication hole 70 and the second communication hole 71 are both ventilation holes that ventilate the hollow layer 22, and are provided at different positions in the vertical direction R. The first communication hole 70 is a ventilation/drainage hole that also serves as an air vent and a drainage hole, and is located at the bottom of the hollow layer 22 or below the hollow layer 22, and provides ventilation and drainage. The second communication hole 71 is a ventilation hole that is located at the top of the hollow layer 22 and provides only ventilation.

The first communication hole 70 is the first communication part of the vertical frame 6 that directly or indirectly connects the isopressure space 17 and the hollow layer 22, and allows direct or indirect ventilation between the isopressure space 17 and the hollow layer 22. The first communication hole 70 allows air to pass toward both the isopressure space 17 and the hollow layer 22, allowing air to circulate. The first communication hole 70 is also located in the drainage path from the hollow layer 22 toward the isopressure space 17, and allows water flowing from the hollow layer 22 toward the isopressure space 17 to pass through. In this way, the first communication hole 70 connects the isopressure space 17 and the hollow layer 22 to ventilate, and also discharges (drains) water toward the isopressure space 17.

The second communication hole 71 is a second communication part of the vertical frame 6 that directly or indirectly communicates the ventilation space 18 and the hollow layer 22, and directly or indirectly ventilates between the ventilation space 18 and the hollow layer 22. The second communication hole 71 passes air toward each of the ventilation space 18 and the hollow layer 22, and circulates air. The ventilation space 18 is an external space located outside the hollow layer 22 and the isobaric space 17, and is located on the outdoor side of the isobaric space 17. The ventilation space 18 is also a communication space that communicates with the outdoor space 15, and is located between the hollow layer 22 and the outdoor space 15, and ventilates with the outdoor space 15. The ventilation space 18 does not communicate with the isobaric space 17, but communicates with the outdoor space 15 and the hollow layer 22. The second communication hole 71 communicates the ventilation space 18 with the hollow layer 22 to ventilate.

Here, the first communication hole 70 is located at the bottom of the hollow layer 22, and directly connects the isobaric space 17 and the hollow layer 22, allowing direct ventilation between the isobaric space 17 and the hollow layer 22. The first communication hole 70 is located between the isobaric space 17 and the hollow layer 22, allowing water to be drained directly from the hollow layer 22 to the isobaric space 17. Water flowing from the hollow layer 22 to the isobaric space 17 is discharged to the isobaric space 17 by the first communication hole 70 and removed from the hollow layer 22. The ventilation space 18 is an internal space (here, the first internal space 63) of the vertical frame 6 that communicates with the outdoor space 15, and is provided inside the vertical frame 6. The second communication hole 71 is located between the ventilation space 18 and the hollow layer 22, and directly connects the ventilation space 18 and the hollow layer 22, allowing direct ventilation between the ventilation space 18 and the hollow layer 22.

The first communication hole 70 is formed in the projection portion 51 of the vertical frame body 50, penetrates the projection portion 51 in the left-right direction S, and opens toward the isobaric space 17 located on one side of the left-right direction S and the hollow layer 22 located on the other side of the left-right direction S. The first communication hole 70 faces the isobaric space 17 and the hollow layer 22, and is open toward the isobaric space 17 and the hollow layer 22, allowing air and water to pass between the isobaric space 17 and the hollow layer 22. The blind 7 has an inclined surface portion 31 provided on the blind body 30, and the inclined surface portion 31 guides water toward the first communication hole 70. The first communication hole 70 is provided at a position above the inclined surface portion 31 of the blind 7 and in contact with the inclined surface portion 31. The inclined surface portion 31 is inclined diagonally downward toward the first communication hole 70 with respect to the horizontal direction.

The first communication hole 70 is located in the middle of the hollow layer 22 in the indoor/outdoor direction T. The inclined surface portion 31 of the gable 7 is lowest where the first communication hole 70 is located (the middle portion in the indoor/outdoor direction T), and gradually becomes higher from the location where the first communication hole 70 is located toward both the outdoor end and the indoor end. When looking at a cross section perpendicular to the longitudinal direction of the gable 7, the inclined surface portion 31 is inclined obliquely downward from the outdoor end facing the outdoor panel body 20 toward the first communication hole 70 with respect to the horizontal direction (indoor/outdoor direction T) and is also inclined obliquely downward from the indoor end facing the indoor panel body 21 toward the first communication hole 70.

Water flows from the top to the bottom on the inclined surface portion 31 of the mesh 7 in the direction of inclination of the inclined surface portion 31 relative to the horizontal direction, and flows toward the first communication hole 70. Here, when condensation occurs inside the hollow layer 22, the condensed water flows along the inclined surface portion 31 to the first communication hole 70 and is discharged through the first communication hole 70. Water is discharged from the hollow layer 22 through the first communication hole 70 toward the equal-pressure space 17.

When viewed in the vertical direction R, the first communication hole 70 is a lower communication hole located below the second communication hole 71, and the second communication hole 71 is an upper communication hole located above the first communication hole 70. The second communication hole 71 is formed in the retaining material 62 of the vertical frame 6, penetrates the retaining material 62 in the left-right direction S, and opens toward the ventilation space 18 (first internal space 63) located on one side of the left-right direction S and the hollow layer 22 located on the other side of the left-right direction S. The second communication hole 71 faces the ventilation space 18 and the hollow layer 22, and is open toward the ventilation space 18 and the hollow layer 22, allowing air to pass between the ventilation space 18 and the hollow layer 22. The second communication hole 71 is provided in the upper part of the vertical frame 6, adjacent to the indoor side of the outdoor panel body 20.

When the air in the hollow layer 22 of the spandrel section 2A is warmed by sunlight or the outside air temperature, the air density in the hollow layer 22 becomes smaller than the outside air density, and the air rises within the hollow layer 22. As a result, the air in the hollow layer 22 is discharged from the hollow layer 22 to the ventilation space 18 through the second communication hole 71 of the vertical frame 6. At the same time, the air in the constant pressure space 17 is supplied from the constant pressure space 17 to the hollow layer 22 through the first communication hole 70 of the vertical frame 6. This ventilates the hollow layer 22, lowering the humidity in the hollow layer 22 or mitigating the increase in humidity in the hollow layer 22, thereby suppressing the occurrence of condensation inside the hollow layer 22. When condensation water occurs inside the hollow layer 22, it is drained from the hollow layer 22 to the constant pressure space 17 through the first communication hole 70.

Thus, the first communication hole 70 of the vertical frame 6 is an air supply/drain hole that serves both as an air supply hole for supplying (air supply) air to the hollow layer 22 and as a drain hole for discharging (draining) water to the isobaric space 17, and the second communication hole 71 of the vertical frame 6 is an exhaust hole for discharging (exhausting) air from the hollow layer 22. The first communication hole 70 passes air from the isobaric space 17 to the hollow layer 22 at the lower part of the hollow layer 22, supplying air from the isobaric space 17 to the hollow layer 22. The first communication hole 70 supplies air from the lower part of the hollow layer 22 and discharges water from the lower part of the hollow layer 22. The second communication hole 71 passes air from the hollow layer 22 to the ventilation space 18 at the upper part of the hollow layer 22, and exhausts air from the hollow layer 22 to the ventilation space 18. The second communication hole 71 discharges air from the upper part of the hollow layer 22.

In response to this, differences in humidity in the air can cause air currents, with high humidity air flowing toward low humidity air. Therefore, depending on the humidity levels of the isobaric space 17, the ventilation space 18, and the hollow layer 22, air can flow from the hollow layer 22 to the isobaric space 17 through the first communication hole 70, and air can flow from the ventilation space 18 to the hollow layer 22 through the second communication hole 71. In this case, air is exhausted from the hollow layer 22 to the isobaric space 17 through the first communication hole 70, and air is supplied from the ventilation space 18 to the hollow layer 22 through the second communication hole 71.

As described above, in the curtain wall unit 2 of the first embodiment, the first communication hole 70 and the second communication hole 71 of the vertical frame 6 ventilate the hollow layer 22, thereby suppressing the occurrence of condensation inside the hollow layer 22. In addition, by draining water into the isobaric space 17 through the first communication hole 70, it is possible to prevent water from being drained from the hollow layer 22 into the outdoor space 15.

The ventilation space 18 is the first internal space 63 of the vertical frame 6 that communicates with the outdoor space 15. The second communication hole 71 allows ventilation between the first internal space 63 of the vertical frame 6 and the hollow layer 22, ensuring the ventilation performance of the hollow layer 22 while preventing rainwater from entering the second communication hole 71 and the hollow layer 22. The ventilation space 18 can also be easily provided inside the vertical frame 6 by utilizing the mounting groove 61 of the vertical frame 6 to which the outdoor panel body 20 is attached. The inclined surface portion 31 of the gable 7 guides water along the inclined surface portion 31 toward the first communication hole 70, and the first communication hole 70 allows water to be smoothly drained toward the equal pressure space 17.

In addition, one first communication hole 70 may be provided in the vertical frame 6, or multiple first communication holes 70 may be provided in the vertical frame 6. Also, one second communication hole 71 may be provided in the vertical frame 6, or multiple second communication holes 71 may be provided in the vertical frame 6. The vertical frame body 50 of the vertical frame 6 may be composed of multiple members, and the internal space of the vertical frame 6 and the ventilation space 18 may be formed by the multiple members of the vertical frame body 50. The ventilation space 18 is not limited to the first internal space 63 of the vertical frame 6, and may be, for example, a joint space 16 that ventilates with the outdoor space 15. In this case, a breathable cover is provided on the part of the vertical frame 6 on the joint space 16 side, and the cover prevents rainwater from entering the part where the second communication hole 71 opens into the joint space 16. In this way, the portion of the vertical frame 6 that forms the second communication hole 71 is not limited to the retaining material 62, but may be another portion that can communicate between the hollow layer 22 and the ventilation space 18.

Next, curtain wall units 2 of other embodiments will be described. In the curtain wall units 2 of each of the following embodiments, explanations of the same points as those of the curtain wall unit 2 of the first embodiment will be omitted, and differences from the curtain wall unit 2 of the first embodiment will be mainly described. In addition, for the curtain wall units 2 of each of the following embodiments, the same names and symbols as those of the curtain wall unit 2 of the first embodiment will be used for configurations that correspond to those of the curtain wall unit 2 of the first embodiment.

Second Embodiment
Fig. 6 is a vertical cross-sectional view showing the spandrel portion 2A of the curtain wall unit 2 of the second embodiment, and shows an enlarged view of a portion including the spandrel portion 2A of the curtain wall unit 2, similar to Fig. 4. Fig. 7 is a horizontal cross-sectional view showing the spandrel portion 2A of the curtain wall unit 2 of the second embodiment, and shows adjacent portions of two curtain wall units 2 on the left and right, similar to Fig. 5.

As shown in the figure, in the curtain wall unit 2 of the second embodiment, the ventilation space 18 and the second communication hole 71 of the vertical frame 6 are different from those of the curtain wall unit 2 of the first embodiment. The ventilation space 18 is the second internal space 64 of the vertical frame 6, and the second communication hole 71 is formed in the projection portion 51 provided in the vertical frame body 50 of the vertical frame 6. The second communication hole 71 penetrates the projection portion 51 of the vertical frame body 50 in the left-right direction S and opens toward the ventilation space 18 (second internal space 64) located on one side in the left-right direction S and the hollow layer 22 located on the other side in the left-right direction S.

The ventilation space 18 and the second communication hole 71 of the first embodiment, and the ventilation space 18 and the second communication hole 71 of the second embodiment may both be provided in the curtain wall unit 2. In this case, both the first internal space 63 and the second internal space 64 of the vertical frame 6 become the ventilation space 18, and two ventilation spaces 18 separated from each other are provided in the vertical frame 6. In addition, two second communication holes 71 are provided in the vertical frame 6 separated from each other in the indoor/outdoor direction T.

The first internal space 63 is an outdoor ventilation space (first ventilation space) located on the outdoor side of the second internal space 64, and the second internal space 64 is an indoor ventilation space (second ventilation space) located on the indoor side of the outdoor ventilation space. The second communication hole 71 (second communication hole 71 in the first embodiment) that connects the first internal space 63 and the hollow layer 22 is an outdoor side second communication hole located on the outdoor side of the second communication hole 71 (second communication hole 71 in the second embodiment) that connects the second internal space 64 and the hollow layer 22, and the second communication hole 71 in the second embodiment is an indoor side second communication hole located on the indoor side of the second communication hole 71 in the first embodiment.

Third Embodiment
Fig. 8 is a vertical cross-sectional view showing the spandrel portion 2A of the curtain wall unit 2 of the third embodiment, and shows an enlarged view of a portion including the spandrel portion 2A of the curtain wall unit 2, similar to Fig. 4. Fig. 9 is a horizontal cross-sectional view showing the spandrel portion 2A of the curtain wall unit 2 of the third embodiment, and shows adjacent portions of two curtain wall units 2 on the left and right, similar to Fig. 5.

As shown in the figure, in the curtain wall unit 2 of the third embodiment, the vertical frame 6 has a drain valve 72 attached to the first communication hole 70, and a third communication hole 73 formed in a position different from the first communication hole 70 and the second communication hole 71. The drain valve 72 is a one-way valve that allows only the flow of water (drainage) toward the isobaric space 17 through the first communication hole 70, and allows drainage toward the isobaric space 17 while preventing water from entering the first communication hole 70 on the isobaric space 17 side. The isobaric space 17 and the hollow layer 22 communicate with each other and ventilate through the drain valve 72 provided in the first communication hole 70.

The third communication hole 73 is a ventilation hole that ventilates the hollow layer 22. The three communication holes 70, 71, and 73 of the vertical frame 6 are provided at different positions in the vertical direction R. The third communication hole 73 is also an air vent hole that is located at the bottom of the hollow layer 22 and only ventilates. The third communication hole 73 is a third communication part of the vertical frame 6 that directly or indirectly connects the ventilation space 18, which is the first internal space 63 of the vertical frame 6, to the hollow layer 22, and ventilates directly or indirectly between the ventilation space 18 and the hollow layer 22. The third communication hole 73 passes air toward both the ventilation space 18 and the hollow layer 22, and circulates air. In this way, the third communication hole 73 connects the ventilation space 18 and the hollow layer 22 to ventilate.

Here, the third communication hole 73 is located between the ventilation space 18 and the hollow layer 22, and directly connects the ventilation space 18 and the hollow layer 22, allowing direct ventilation between the ventilation space 18 and the hollow layer 22. In addition, when viewed in the vertical direction R, the third communication hole 73 is a lower communication hole located below the second communication hole 71, and the second communication hole 71 is an upper communication hole located above the third communication hole 73. In the lower part of the hollow layer 22, the third communication hole 73 is located above the first communication hole 70.

The third communication hole 73 is formed in the retaining material 62 of the vertical frame 6, penetrates the retaining material 62 in the left-right direction S, and opens toward the ventilation space 18 (first internal space 63) located on one side in the left-right direction S and the hollow layer 22 located on the other side in the left-right direction S. The third communication hole 73 faces the ventilation space 18 and the hollow layer 22, and is open toward the ventilation space 18 and the hollow layer 22, allowing air to pass between the ventilation space 18 and the hollow layer 22. The second communication hole 71 and the third communication hole 73 communicate the ventilation space 18 and the hollow layer 22 at different locations (upper location, lower location) in the up-down direction R of the ventilation space 18.

When the air temperature rises in the hollow layer 22 of the spandrel section 2A, the air is exhausted from the hollow layer 22 to the ventilation space 18 through the second communication hole 71 of the vertical frame 6. At the same time, air is supplied from the constant pressure space 17 to the hollow layer 22 through the first communication hole 70 of the vertical frame 6, and air is supplied from the ventilation space 18 to the hollow layer 22 through the third communication hole 73 of the vertical frame 6. This allows ventilation of the hollow layer 22.

Thus, the third communication hole 73 is an air supply hole that supplies (intakes) air to the hollow layer 22, and passes air from the ventilation space 18 toward the hollow layer 22 at the bottom of the hollow layer 22, supplying air from the ventilation space 18 to the hollow layer 22. Air is supplied from the bottom of the hollow layer 22 through the first communication hole 70 and the third communication hole 73. Also, when air is supplied from the ventilation space 18 to the hollow layer 22 through the second communication hole 71 in response to the difference in humidity in the air, air is exhausted from the hollow layer 22 to the constant pressure space 17 through the first communication hole 70, and exhausted from the hollow layer 22 to the ventilation space 18 through the third communication hole 73.

When the drain valve 72 is attached to the first communication hole 70, the ventilation performance of the first communication hole 70 may be affected, and the amount of air passing through the first communication hole 70 may decrease. In response to this, the decrease in the amount of air passing through the first communication hole 70 can be compensated for by ventilation through the third communication hole 73. Therefore, in the curtain wall unit 2 of the third embodiment, the drain valve 72 can prevent water from entering the first communication hole 70 and the hollow layer 22 from the equal pressure space 17, and the third communication hole 73 can ensure the ventilation performance of the hollow layer 22.

Note that one third communication hole 73 may be provided in the vertical frame 6, or multiple third communication holes 73 may be provided in the vertical frame 6. The ventilation space 18 is not limited to the first internal space 63 of the vertical frame 6, and may be, for example, the joint space 16. In this case, a breathable cover is provided on the part of the vertical frame 6 on the joint space 16 side, and the cover prevents rainwater from entering the part of the third communication hole 73 that opens into the joint space 16. In this way, the part that forms the third communication hole 73 of the vertical frame 6 is not limited to the retaining material 62, and may be another part that can communicate between the hollow layer 22 and the ventilation space 18.

As with the curtain wall unit 2 of the second embodiment, the ventilation space 18 may be the second internal space 64 of the vertical frame 6, and the third communication hole 73 may be formed in the projection portion 51 provided in the vertical frame body 50 of the vertical frame 6. In this case, the third communication hole 73 penetrates the projection portion 51 of the vertical frame body 50 in the left-right direction S, and opens toward the ventilation space 18 (second internal space 64) located on one side of the left-right direction S and the hollow layer 22 located on the other side of the left-right direction S.

The third communication hole 73 (third communication hole 73 of the third embodiment) that connects the first internal space 63 and the hollow layer 22, and the third communication hole 73 that connects the second internal space 64 and the hollow layer 22 may both be formed in the vertical frame 6, and the two third communication holes 73 may be provided in the vertical frame 6 at a distance from each other in the indoor/outdoor direction T. In this case, the third communication hole 73 of the third embodiment is an outdoor third communication hole located on the outdoor side of the third communication hole 73 that connects the second internal space 64 and the hollow layer 22, and the third communication hole 73 that connects the second internal space 64 and the hollow layer 22 is an indoor third communication hole located on the indoor side of the third communication hole 73 of the third embodiment.

Either or both of the second communication hole 71 of the first embodiment and the second communication hole 71 of the second embodiment may be provided in the curtain wall unit 2. In addition, the second communication hole 71 of the first embodiment, the second communication hole 71 of the second embodiment, the third communication hole 73 of the third embodiment, and the third communication hole 73 that connects the second internal space 64 and the hollow layer 22 may be arbitrarily combined to provide one or more second communication holes 71 and one or more third communication holes 73 in the curtain wall unit 2.

Fourth Embodiment
Fig. 10 is a vertical cross-sectional view showing the spandrel portion 2A of the curtain wall unit 2 of the fourth embodiment, and shows an enlarged view of a portion including the spandrel portion 2A of the curtain wall unit 2, similar to Fig. 4. Fig. 11 is a horizontal cross-sectional view showing the spandrel portion 2A of the curtain wall unit 2 of the fourth embodiment, and shows adjacent portions of two curtain wall units 2 on the left and right, similar to Fig. 5.

As shown in the figure, in the curtain wall unit 2 of the fourth embodiment, the gable 7 and the first communication hole 70 of the vertical frame 6 are different from those of the curtain wall unit 2 of the first embodiment. The gable 7 has a hollow portion 32 provided in the gable body 30 and surrounding the first communication hole 70. The hollow portion 32 is located below the hollow layer 22 and faces the hollow layer 22. The hollow portion 32 is also located between the outdoor panel body 20 and the indoor panel body 21, extends in the longitudinal direction of the gable 7, and is disposed between a pair of vertical frames 6 in the left-right direction S. The end of the hollow portion 32 is the end of the hollow portion 32 in the longitudinal direction of the gable 7, and opens toward the vertical frame 6. The hollow portion 32 surrounds the first communication hole 70 at the end.

The opening at the end of the hollow section 32 is located at the end of the hollow section 32 and is open toward the vertical frame 6. With the first communication hole 70 positioned at the opening at the end of the hollow section 32, the hollow section 32 contacts the vertical frame 6 (here, the projection section 51 of the vertical frame body 50) at the end including the opening. When the first communication hole 70 and the hollow section 32 are viewed in the longitudinal direction of the lattice 7, the first communication hole 70 is located at the opening at the end of the hollow section 32 and is disposed at a location that is inside the hollow section 32. At the end of the hollow section 32, the first communication hole 70 faces the opening at the end of the hollow section 32 and the internal space 33 of the hollow section 32.

The internal space 33 of the hollow section 32 of the blind 7 is a space within the hollow section 32 and is formed inside the hollow section 32. The opening at the end of the hollow section 32 is the opening at the end of the internal space 33 facing the vertical frame 6 and the first communication hole 70. The first communication hole 70 is located below the hollow layer 22 and opens toward the isobaric space 17 located on one side in the left-right direction S and the internal space 33 of the hollow section 32 located on the other side in the left-right direction S. In addition, the first communication hole 70 faces the isobaric space 17 and the internal space 33 of the hollow section 32 and is open toward the isobaric space 17 and the internal space 33 of the hollow section 32. The internal space 33 of the hollow section 32 is located between the first communication hole 70 and the hollow layer 22, and the first communication hole 70 communicates with the hollow layer 22 through the internal space 33 of the hollow section 32.

The hollow section 32 of the transom 7 has a partition section 34 that separates the internal space 33 from the hollow layer 22, an open hole 35 formed in the partition section 34, and an inclined surface section 31. The transom 7 also has an upper surface section 36 provided on the transom body 30. The partition section 34 is the upper surface section of the hollow section 32, and is located above the internal space 33 and between the internal space 33 and the hollow layer 22. The partition section 34 is also a part of the upper surface section 36 (the outdoor side part). The upper surface section 36 and the partition section 34 are located between the outdoor side panel body 20 and the indoor side panel body 21, and are inclined with respect to the horizontal plane.

The upper surface portion 36 and the partition wall portion 34 are located below the hollow layer 22 and face the hollow layer 22. When viewed in a cross section perpendicular to the longitudinal direction of the transom 7, the upper surface portion 36 and the partition wall portion 34 are inclined with respect to the horizontal direction (indoor-outdoor direction T) and are inclined diagonally downward from the indoor end toward the outdoor end. The open hole 35 is a through hole formed at the outdoor end of the upper surface portion 36 and the partition wall portion 34, and penetrates the upper surface portion 36 and the partition wall portion 34. The upper surface portion 36 and the partition wall portion 34 are inclined diagonally downward from the indoor end toward the open hole 35 with respect to the horizontal direction.

Water flows from the top to the bottom on the top surface 36 and the partition wall 34 in the inclination direction of the top surface 36 and the partition wall 34 relative to the horizontal direction, and flows toward the open hole 35. Here, when condensation occurs inside the hollow layer 22, the condensed water flows along the top surface 36 and the partition wall 34 to the open hole 35. The mesh 7 guides water toward the open hole 35 inside the hollow layer 22 by means of the top surface 36 and the partition wall 34.

The open hole 35 is located between the hollow layer 22 and the internal space 33 of the hollow section 32, and opens toward the hollow layer 22 and the internal space 33 of the hollow section 32. The open hole 35 faces the hollow layer 22 and the internal space 33 of the hollow section 32, and opens toward the hollow layer 22 and the internal space 33 of the hollow section 32 to allow ventilation, and allows water to pass from the hollow layer 22 to the internal space 33 of the hollow section 32. The open hole 35 connects the hollow layer 22 and the internal space 33 of the hollow section 32, and allows air to pass between the hollow layer 22 and the internal space 33 of the hollow section 32 to allow ventilation. The open hole 35 also discharges (drains) water from the hollow layer 22 toward the internal space 33 of the hollow section 32.

The first communication hole 70 is located above the indoor end of the inclined surface portion 31. The inclined surface portion 31 is the underside of the hollow portion 32, and is located inside the hollow portion 32, below the internal space 33. The outdoor end of the inclined surface portion 31 is located below the open hole 35, and the indoor end of the inclined surface portion 31 is located below the first communication hole 70. When viewed in a cross section perpendicular to the longitudinal direction of the lattice 7, the inclined surface portion 31 is inclined diagonally downward from the outdoor end and open hole 35 toward the indoor end and first communication hole 70 with respect to the horizontal direction.

The first communication hole 70 connects the isobaric space 17 to the hollow layer 22 via the internal space 33 of the hollow section 32 and the open hole 35. The isobaric space 17 and the hollow layer 22 communicate with each other and ventilate via the first communication hole 70, the internal space 33 of the hollow section 32, and the open hole 35. Water enters the internal space 33 of the hollow section 32 from the hollow layer 22 through the open hole 35, and flows in the internal space 33 along the inclined surface section 31 to the first communication hole 70. In this way, the water flows from the hollow layer 22 through the open hole 35 and the internal space 33 in order to the first communication hole 70, and is discharged toward the isobaric space 17 via the first communication hole 70.

In the curtain wall unit 2 of the fourth embodiment, the internal space 33 of the hollow section 32 of the fascia 7 can be ventilated together with the hollow layer 22. In addition, the open holes 35 of the hollow section 32 allow for smooth ventilation between the hollow layer 22 and the internal space 33 of the hollow section 32, and for smooth drainage from the hollow layer 22 to the internal space 33 of the hollow section 32.

In addition, one open hole 35 may be provided in the hollow portion 32 of the fascia 7, or multiple open holes 35 may be provided in the hollow portion 32 of the fascia 7. The multiple open holes 35 are formed in the hollow portion 32 at multiple locations in the longitudinal direction of the fascia 7, for example. In addition, either or both of the second communication hole 71 of the first embodiment and the second communication hole 71 of the second embodiment may be provided in the curtain wall unit 2.

Fifth Embodiment
Fig. 12 is a vertical cross-sectional view showing the spandrel portion 2A of the curtain wall unit 2 of the fifth embodiment, and shows an enlarged view of a portion including the spandrel portion 2A of the curtain wall unit 2, similar to Fig. 10. Fig. 13 is a horizontal cross-sectional view showing the spandrel portion 2A of the curtain wall unit 2 of the fifth embodiment, and shows adjacent portions of two curtain wall units 2 on the left and right, similar to Fig. 11.

As shown in the figure, in the curtain wall unit 2 of the fifth embodiment, the first communication hole 70 of the transom 7 and the vertical frame 6 is configured similarly to the first communication hole 70 of the transom 7 and the vertical frame 6 in the curtain wall unit 2 of the fourth embodiment. Also, the vertical frame 6 has a drain valve 72 attached to the first communication hole 70 and a third communication hole 73, similar to the curtain wall unit 2 of the third embodiment.

As described above, this embodiment discloses the curtain wall units described in (1) to (6) below.

(1) A curtain wall unit comprising a frame body, an outdoor panel body and an indoor panel body provided in a spandrel section and held by the frame body, and a hollow space formed between the outdoor panel body and the indoor panel body, the frame bodies adjacent to each other in the left-right direction forming an isobaric space that is isobaric with the outdoor space when the curtain wall unit is installed side by side in the left-right direction,
the frame body has vertical frames positioned on both the left and right sides of the hollow layer to form the isobaric space,
The vertical frame is a curtain wall unit having a first communication hole that connects the isobaric space with the hollow layer to allow ventilation and drains water toward the isobaric space, and a second communication hole that connects a ventilation space located outside the isobaric space and ventilates the outdoor space with the hollow layer to allow ventilation.
The curtain wall unit described in (1) can suppress the occurrence of condensation inside the hollow layer provided in the spandrel portion of the curtain wall unit while preventing drainage from the hollow layer into the outdoor space.

(2) In the curtain wall unit described in (1),
The ventilation space is an internal space of the vertical frame of a curtain wall unit that is located outdoors relative to the equal pressure space and is ventilated to the outdoor space.
In the curtain wall unit described in (2), ventilation between the internal space of the vertical frame, which is ventilated to the outdoor space, and the hollow layer ensures the ventilation performance of the hollow layer while preventing rainwater from entering the second communication hole and the hollow layer.

(3) In the curtain wall unit described in (1) or (2),
The vertical frame is a curtain wall unit having a drain valve attached to the first communication hole and a third communication hole formed in a position different from the second communication hole and connecting the ventilation space to the hollow layer to provide ventilation.
In the curtain wall unit described in (3), the drain valve can prevent water from entering the first communication hole and the hollow layer from the equal-pressure space, and the third communication hole can ensure the ventilation performance of the hollow layer.

(4) In the curtain wall unit according to any one of (1) to (3),
The frame has a partition located below the hollow layer,
The transom is a curtain wall unit having an inclined surface portion that slopes diagonally downward toward the first communication hole.
In the curtain wall unit described in (4), the interleaved inclined surface portion guides water along the inclined surface portion toward the first communication hole, and the first communication hole allows water to be smoothly drained toward the equal-pressure space.

(5) In the curtain wall unit according to any one of (1) to (3),
The frame has a partition located below the hollow layer,
The transom has a hollow portion in contact with the vertical frame with the first communication hole positioned at an opening at an end portion that opens toward the vertical frame,
The first communication hole is a curtain wall unit that communicates with the hollow layer through the internal space of the hollow portion.
In the curtain wall unit described in (5), the internal space of the hollow space without lattices can be ventilated together with the hollow layer.

(6) In the curtain wall unit described in (5),
The hollow portion is a curtain wall unit having an open hole that is open toward the hollow layer and the internal space of the hollow portion to allow ventilation and that allows water to pass from the hollow layer toward the internal space of the hollow portion.
In the curtain wall unit described in (6), the open holes in the hollow portion allow for smooth ventilation between the hollow layer and the internal space of the hollow portion, and for smooth drainage from the hollow layer to the internal space of the hollow portion.

1: curtain wall, 2: curtain wall unit, 2A: spandrel section, 2B: vision section, 3: frame, 3A: opening, 3B: opening, 4: upper frame, 5: lower frame, 6: vertical frame, 7: gutter, 10: building, 11: structure, 12: boundary section, 12A: indoor space, 13: floor section, 13A: indoor space, 14: exterior wall, 15: outdoor space, 16: joint space, 17: equal pressure space, 18: ventilation space, 20: outdoor panel body, 21: indoor panel body, 22: hollow layer, 30: gutter main body, 31: inclined surface section , 32...hollow section, 33...internal space, 34...partition wall section, 35...opening hole, 36...upper surface section, 40...horizontal edge, 50...vertical frame body, 51...projection section, 52...fitting section, 52A...outdoor fitting wall, 52B...indoor fitting wall, 53...hollow section, 54...watertight material, 55...airtight material, 60...vertical edge, 61...mounting groove section, 62...retaining material, 63...first internal space, 64...second internal space, 65...screw, 70...first communication hole, 71...second communication hole, 72...drain valve, 73...third communication hole, R...up-down direction, S...left-right direction, T...indoor/outdoor direction.

Claims (6)

A curtain wall unit comprising: a frame body; an outdoor panel body and an indoor panel body provided in a spandrel portion and held by the frame body; and a hollow layer formed between the outdoor panel body and the indoor panel body, the frame bodies adjacent to each other in the left-right direction forming an isopressure space having the same pressure as the outdoor space when the curtain wall unit is installed side by side in the left-right direction,
the frame body has vertical frames positioned on both the left and right sides of the hollow layer to form the isobaric space,
The vertical frame is a curtain wall unit having a first communication hole that connects the isobaric space with the hollow layer to allow ventilation and drains water toward the isobaric space, and a second communication hole that connects a ventilation space located outside the isobaric space and ventilates the outdoor space with the hollow layer to allow ventilation. 2. The curtain wall unit according to claim 1,
The ventilation space is an internal space of the vertical frame of a curtain wall unit that is located outdoors relative to the equal pressure space and is ventilated to the outdoor space. The curtain wall unit according to claim 1 or 2,
The vertical frame is a curtain wall unit having a drain valve attached to the first communication hole and a third communication hole formed in a position different from the second communication hole and connecting the ventilation space to the hollow layer to provide ventilation. The curtain wall unit according to claim 1 or 2,
The frame has a partition located below the hollow layer,
The transom is a curtain wall unit having an inclined surface portion that slopes diagonally downward toward the first communication hole. The curtain wall unit according to claim 1 or 2,
The frame has a partition located below the hollow layer,
The transom has a hollow portion in contact with the vertical frame with the first communication hole positioned at an opening at an end portion that opens toward the vertical frame,
The first communication hole is a curtain wall unit that communicates with the hollow layer through the internal space of the hollow portion. The curtain wall unit according to claim 5,
The hollow portion is a curtain wall unit having an open hole that is open toward the hollow layer and the internal space of the hollow portion to allow ventilation and that allows water to pass from the hollow layer toward the internal space of the hollow portion.

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