Sash airtight structure and building

Abstract

To provide a sash airtight structure and a building which are capable of suppressing air leakage between a metal frame and a non-metal frame.SOLUTION: A sash airtight structure according to the present invention includes a sash frame disposed in an opening formed in an outer wall, in which the sash frame includes a metal frame positioned on the outdoor side and a non-metal frame connected to the indoor side of the metal frame, and includes an airtight member that is in contact with a surface of the metal frame and a surface of the non-metal frame in the sash frame.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a sash airtight structure and a building. [Background technology]

[0002] Conventionally, sash frames placed in building openings have mainly been constructed solely from metal frames such as aluminum, but in recent years, composite sash frames have become known for their improved thermal insulation performance. Composite sash frames are constructed by combining a metal frame and a resin frame. Patent Document 1 describes this type of composite sash frame. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2002-180748 Summary of the Invention [Problem to be solved by the invention]

[0004] In a composite sash frame such as that described in Patent Document 1, if an unintended gap occurs between the metal frame and the resin frame serving as a non-metallic frame, there is a risk of air leakage from that gap.

[0005] An object of the present invention is to provide a sash airtight structure and a building that can suppress air leakage between a metal frame and a non-metal frame. [Means for solving the problem]

[0006] A first aspect of the present invention is a sash airtight structure comprising a sash frame placed in an opening formed in an exterior wall, the sash frame comprising a metal frame located on the outdoor side and a non-metallic frame connected to the indoor side of the metal frame, and an airtight member in contact with the surface of the metal frame and the surface of the non-metallic frame in the sash frame.

[0007] In one embodiment of the present invention, in the sash frame, the metal frame is made of aluminum, and the non-metal frame is made of resin.

[0008] In one embodiment of the present invention, the airtight member includes an airtight tape that is arranged so as to straddle the boundary between the metal frame and the non-metal frame and is adhered to each of the metal frame and the non-metal frame.

[0009] In one embodiment of the present invention, the airtight member includes a packing material disposed between the metal frame and the non-metal frame.

[0010] In one embodiment of the present invention, the packing material is sandwiched between the metal frame and the non-metal frame.

[0011] In one embodiment of the present invention, the packing material has an engaging portion that is engaged with one of the engaging portions of the metal frame and the non-metal frame, and the packing material is pressed against the other of the metal frame and the non-metal frame with the engaging portion engaged with the one of the engaging portions.

[0012] In one embodiment of the present invention, the airtight member is disposed continuously over the entire area of ​​the sash frame in the frame circumferential direction.

[0013] A building according to a second aspect of the present invention comprises the above-described sash airtight structure.

[0014] In one embodiment of the present invention, the airtight member is positioned in the thickness direction of the exterior wall at a position between the airtight line of the exterior wall and the airtight line at the opening formed by the sash frame and the panel material fitted into the sash frame. [Effects of the Invention]

[0015] According to the present invention, it is possible to provide a sash airtight structure and a building that can suppress air leakage between a metal frame and a non-metal frame. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is a horizontal cross-sectional view of an exterior wall of a building according to one embodiment of the present invention, including a sash airtight structure according to one embodiment of the present invention. [Figure 2] 2 is a vertical cross-sectional view taken along the thickness direction of the exterior wall of the building shown in FIG. 1. [Figure 3] FIG. 2 is an enlarged cross-sectional view of a part of FIG. [Figure 4] 4 is a diagram showing a modified example of the airtight member shown in FIG. 3. FIG. [Figure 5] 4 is a diagram showing another modified example of the airtight member shown in FIG. 3. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0017] Hereinafter, embodiments of a sash airtight structure and a building according to the present invention will be described with reference to the drawings. In each drawing, the same reference numerals are used to designate common components.

[0018] 1 and 2 are diagrams showing a building 100 as one embodiment of a building according to the present invention. The building 100 is equipped with a sash airtight structure 10 as one embodiment of the sash airtight structure according to the present invention. More specifically, FIGS. 1 and 2 show details of an exterior wall 101 of the building 100. FIG. 1 is a horizontal cross-sectional view of the exterior wall 101 of the building 100. FIG. 2 is a vertical cross-sectional view along the thickness direction A of the exterior wall 101 of the building 100. FIG. 3 is an enlarged cross-sectional view of a portion of FIG. 1.

[0019] First, an overview of the building 100 will be described. The building 100 of this embodiment is, for example, a two-story detached house with a steel frame. Although the building 100 of this embodiment is a detached house, it may also be, for example, an apartment building with multiple dwelling units.

[0020] The building 100 of this embodiment comprises a reinforced concrete foundation and a superstructure supported by the foundation, which has a framework made up of framework members such as columns and beams. The superstructure of this embodiment has a steel framework, but may also have a wooden framework, for example, and its structure is not particularly limited. The framework members that make up the framework of the building 100 of this embodiment are standardized in advance and are manufactured in a factory before being transported to the construction site and assembled.

[0021] More specifically, the superstructure of the building 100 of this embodiment includes the above-mentioned framework, exterior walls 101, floors, and a roof.

[0022] The exterior wall 101 is a wall that separates the indoor space from the outdoor space of the building 100. As shown in Figures 1 and 2, the exterior wall 101 of the building 100 of this embodiment has an exterior finishing layer formed by connecting panel-shaped exterior materials 102 made of lightweight aerated concrete (ALC). However, the exterior materials 102 may also be metal or ceramic siding, extruded cement boards, wood panels, etc.

[0023] 1 and 2, the exterior wall 101 is provided with an insulating layer formed by connecting panels of insulating material 103 made of foamed resin such as phenolic foam along the inner surface of the exterior finishing layer. However, the insulating material 103 may also be made of a fiber such as rock wool.

[0024] 1 and 2, the exterior wall 101 is provided with an interior finishing layer made of an interior material 104 composed of a gypsum board and a finishing material such as wall paper attached to the surface of the gypsum board. However, the configuration of the interior material 104 is not limited to that of this embodiment.

[0025] The floor of the building 100 of this embodiment includes a floor slab material. The floor slab material is installed between the beams of the framework and is directly or indirectly supported by the beams. For example, ALC panels can be used as the floor slab material, but other materials such as folded plates, extruded cement boards, and wood-based panels can also be used. In addition to the floor slab material, the floor may include, for example, a ceiling interior material that forms the ceiling surface of the lower floor and is attached directly or indirectly to the floor slab material. The floor may also include a floor interior material such as flooring that forms the floor surface of the upper floor and is layered on the floor slab material.

[0026] The roof of the building 100 in this embodiment is a flat roof. The roof floor slab materials constituting the flat roof can be made of ALC panels, as with the flooring materials described above, but are not limited to ALC panels. The roof floor slab materials are waterproofed by being covered with a waterproof sheet made of polyvinyl chloride resin, for example. The roof of the building 100 is not limited to a flat roof, and may be a sloped roof using roof exterior materials such as slate.

[0027] Next, the sash airtight structure 10 of the building 100 will be described with reference to FIGS.

[0028] As shown in FIGS. 1 and 2, an opening 101a is formed in an exterior wall 101. As in this embodiment, an opening reinforcing member 106 may be provided in the exterior wall 101 so as to surround the opening 101a. The opening reinforcing member 106 is fixed directly or indirectly to a frame member that constitutes a framework. Examples of the opening 101a in the exterior wall 101 include a window and a doorway. While the opening 101a shown in FIGS. 1 and 2 is a window as an example, it may also be a doorway that allows access between an indoor space and an outdoor space.

[0029] A sash frame 1, a panel material 2 fitted into the sash frame 1, and an interior frame 3 are arranged in an opening 101a of an exterior wall 101. A sealing material 105 is filled between an exterior material 102 of the exterior wall 101 and the sash frame 1.

[0030] The sash frame 1 is attached so as to cover the inner surface of an opening 101a in an exterior wall 101. In this embodiment, an outer shoji screen 2a and an inner shoji screen 2b that are movable relative to the sash frame 1 are fitted as panel materials 2 into the sash frame 1. In other words, a sliding window is installed in the opening 101a.

[0031] The outer shoji screen 2a and the inner shoji screen 2b as the panel material 2 in this embodiment are composed of a double glass plate 5 and a frame 6 as a frame material for the double glass plate 5, but are not limited to this configuration. The panel material 2 may also have, for example, a fixed structure.

[0032] The interior frame 3 is disposed on the indoor side of the sash frame 1 and the panel material 2. The interior frame 3 is, for example, a picture frame.

[0033] In other words, the outdoor side of the inner surface of the opening 101a in this embodiment is covered by the sash frame 1. On the other hand, the indoor side of the inner surface of the opening 101a in this embodiment is covered by the interior frame 3.

[0034] As shown in Figures 1 and 2, the sash frame 1 includes a metal frame 1a made of metal and a non-metal frame 1b made of non-metal. The metal frame 1a is located on the outdoor side of the sash frame 1. The non-metal frame 1b is connected to the indoor side of the metal frame 1a.

[0035] Although the material forming the metal frame 1a of the sash frame 1 is not particularly limited, from the viewpoints of versatility, manufacturing costs, etc., the metal frame 1a is preferably made of aluminum. Furthermore, the non-metallic frame 1b of the sash frame 1 of this embodiment is made of resin. More specifically, the non-metallic frame 1b of the sash frame 1 can be made of, for example, vinyl chloride. Note that the non-metallic frame 1b may be made of a material other than resin as long as it is non-metallic, but from the viewpoint of improving thermal insulation performance, it is preferable that it be made of resin.

[0036] The interior frame 3 is also made of a non-metal material. The interior frame 3 can be made of wood, for example.

[0037] In this embodiment, the metal frame 1a and the non-metal frame 1b of the sash frame 1 are integrated by fastening or fitting with fastening members such as screws or bolts. Also, in this embodiment, the non-metal frame 1b of the sash frame 1 and the interior frame 3 are fastened with fastening members such as screws or bolts.

[0038] 1 and 2, the sash airtight structure 10 includes an airtight member 4 that is in contact with the surface of the metal frame 1a and the surface of the non-metal frame 1b in the sash frame 1. By including such an airtight member 4, it is possible to suppress air leakage between the metal frame 1a and the non-metal frame 1b.

[0039] Fig. 3 is an enlarged cross-sectional view of the area enclosed by the dashed-dotted circle in Fig. 1. As shown in Fig. 3, the airtight member 4 of this embodiment includes airtight tape 4a that is arranged across the boundary BL between the metal frame 1a and the non-metal frame 1b and is attached to both the metal frame 1a and the non-metal frame 1b. By including such airtight tape 4a in the airtight member 4, air leakage between the metal frame 1a and the non-metal frame 1b can be easily suppressed.

[0040] 1 to 3, only the airtight tape 4a is shown as the airtight member 4, but the airtight member 4 may include a member other than the airtight tape 4a that is in contact with the surface of the metal frame 1a and the surface of the non-metal frame 1b of the sash frame 1. For example, the airtight member 4 may include the airtight tape 4a of this embodiment and packing materials 4b and 4c (see FIGS. 4 and 5) described below. The packing materials 4b and 4c will be described in detail later (see FIGS. 4 and 5).

[0041] Furthermore, the airtight member 4 of this embodiment is disposed continuously over the entire circumferential area of ​​the sash frame 1. More specifically, the airtight tape 4a of this embodiment covers the boundary BL between the metal frame 1a and the non-metal frame 1b over the entire circumferential area of ​​the sash frame 1. In this manner, air leakage can be suppressed over the entire circumferential area of ​​the frame. In other words, compared to a configuration in which the airtight tape 4a is not disposed over the entire circumferential area of ​​the frame, air leakage between the metal frame 1a and the non-metal frame 1b can be suppressed. Note that the "circumferential area of ​​the frame" refers to the direction along the sash frame 1.

[0042] More specifically, the sash frame 1 of this embodiment includes two vertical frames 21 extending substantially parallel to the vertical direction, an upper horizontal frame 22 connecting the vertical upper ends of the two vertical frames 21, and a lower horizontal frame 23 connecting the vertical lower ends of the two vertical frames 21. Each vertical frame 21 is composed of a metal vertical frame 21a of the metal frame 1a and a non-metallic vertical frame 21b of the non-metallic frame 1b. The upper horizontal frame 22 is composed of a metal upper horizontal frame 22a of the metal frame 1a and a non-metallic upper horizontal frame 22b of the non-metallic frame 1b. The lower horizontal frame 23 is composed of a metal lower horizontal frame 23a of the metal frame 1a and a non-metallic lower horizontal frame 23b of the non-metallic frame 1b.

[0043] The airtight tape 4a of this embodiment is arranged so as to straddle the boundary BL between the surface of the metal vertical frame 21a of the metal frame 1a and the surface of the non-metal vertical frame 21b of the non-metal frame 1b in each vertical frame 21, and is adhered to the surface of the metal vertical frame 21a and the surface of the non-metal vertical frame 21b. The airtight tape 4a covers the entire area of ​​the boundary BL of each vertical frame 21.

[0044] The airtight tape 4a of this embodiment is arranged so as to straddle the boundary BL between the surface of the metal upper horizontal frame 22a of the metal frame 1a and the surface of the non-metal upper horizontal frame 22b of the non-metal frame 1b in the upper horizontal frame 22, and is adhered to both the surface of the metal upper horizontal frame 22a and the surface of the non-metal upper horizontal frame 22b. The airtight tape 4a covers the entire area of ​​the boundary BL of the upper horizontal frame 22.

[0045] Furthermore, the airtight tape 4a of this embodiment is arranged so as to straddle the boundary BL between the surface of the metal lower horizontal frame 23a of the metal frame 1a and the surface of the non-metal lower horizontal frame 23b of the non-metal frame 1b in the lower horizontal frame 23, and is attached to both the surface of the metal lower horizontal frame 23a and the surface of the non-metal lower horizontal frame 23b. The airtight tape 4a covers the entire area of ​​the boundary BL of the lower horizontal frame 23.

[0046] In this way, the airtight tape 4a of this embodiment extends along each vertical frame 21, upper horizontal frame 22 and lower horizontal frame 23 of the sash frame 1, covering all of the boundaries BL of each vertical frame 21, upper horizontal frame 22 and lower horizontal frame 23.

[0047] The airtight tape 4a may be, for example, a single-sided adhesive tape having an adhesive layer on only one side thereof. Examples of the airtight tape 4a include butyl tape.

[0048] As shown in FIGS. 1 and 2 , the airtight member 4 is disposed in the thickness direction A of the exterior wall 101 between the airtight line AL1 of the exterior wall 101 and the airtight line AL2 at the opening 101a formed by the sash frame 1 and the panel material 2 fitted into the sash frame 1. In this embodiment, the airtight line AL1 of the exterior wall 101 extends along the indoor surface of the thermal insulation material 103 and terminates at the indoor surface of the non-metallic interior frame 3. In other words, the airtight line AL1 of the exterior wall 101 is terminated at the position of the opening 101a. Therefore, at the position of the opening 101a, the airtight line AL2 at the opening 101a is formed not by the airtight line AL1 of the exterior wall 101 but by the sash frame 1 and the panel material 2 fitted into the sash frame 1. This maintains airtightness at the opening 101a. However, as shown in FIGS. 1 and 2 , the two airtight lines AL1 and AL2 may not be continuous. In other words, a gap may be formed between the two airtight lines AL1 and AL2 in the thickness direction A of the exterior wall 101. In such cases, air leakage is likely to occur between the two airtight lines AL1 and AL2. If a gap is formed between the metal frame 1a and the non-metallic frame 1b at this location, the amount of air leakage may increase. Therefore, if the boundary BL between the metal frame 1a and the non-metallic frame 1b is located at a position between the two airtight lines AL1 and AL2 in the thickness direction A where air leakage is likely to occur, it is preferable to place at least an airtight member 4 at that position, as in this embodiment. This can efficiently suppress air leakage through the gap between the metal frame 1a and the non-metallic frame 1b. Note that for ease of explanation, Figure 2 also shows the positions of the airtight line AL2 formed at both the outer and inner shoji screens 2a and 2b in the thickness direction A.

[0049] The cross-sectional shape of the sash frame 1 shown in FIGS. 1 to 3 is an example, and the shape is not particularly limited.

[0050] Next, modified examples of the airtight member 4 will be described with reference to Figures 4 and 5. Figures 4 and 5 are enlarged cross-sectional views taken at the same positions as in Figure 3.

[0051] The airtight member 4 shown in Fig. 4 includes a packing material 4b disposed between the metal frame 1a and the non-metallic frame 1b. The packing material 4b is in contact with the surface of the metal frame 1a and the surface of the non-metallic frame 1b in the sash frame 1. By including such a packing material 4b in the airtight member 4, air leakage between the metal frame 1a and the non-metallic frame 1b can be easily suppressed.

[0052] Furthermore, it is preferable that the packing material 4b be sandwiched between the metal frame 1a and the non-metallic frame 1b. In other words, it is preferable that the packing material 4b be compressed between the metal frame 1a and the non-metallic frame 1b. This improves the sealing performance between the metal frame 1a and the non-metallic frame 1b, and further suppresses air leakage between the metal frame 1a and the non-metallic frame 1b.

[0053] More specifically, the packing material 4b shown in Fig. 4 is disposed between the metal vertical frame 21a of the metal frame 1a and the non-metallic vertical frame 21b of the non-metallic frame 1b in each vertical frame 21, and is sandwiched therebetween. Furthermore, the packing material 4b shown in Fig. 4 is disposed between the metal upper horizontal frame 22a (see Fig. 2) of the metal frame 1a and the non-metallic upper horizontal frame 22b (see Fig. 2) of the non-metallic frame 1b in the upper horizontal frame 22 (see Fig. 2), and is sandwiched therebetween. Furthermore, the packing material 4b shown in Fig. 4 is disposed between the metal lower horizontal frame 23a (see Fig. 2) of the metal frame 1a and the non-metallic lower horizontal frame 23b (see Fig. 2) of the non-metallic frame 1b in the lower horizontal frame 23 (see Fig. 2), and is sandwiched therebetween.

[0054] The packing material 4b shown in Fig. 4 may be, for example, a plate-shaped sealing member made of rubber. The rubber sealing member may be made of solid rubber or foam rubber such as synthetic rubber foam. One specific example of such a sealing member is "EPTSealer" (registered trademark) by Nitto Denko Corporation.

[0055] The airtight member 4 shown in Fig. 5 includes a packing material 4c disposed between the metal frame 1a and the non-metallic frame 1b, similar to Fig. 4. The packing material 4c is in contact with the surface of the metal frame 1a and the surface of the non-metallic frame 1b of the sash frame 1. By including such packing material 4c in the airtight member 4, air leakage between the metal frame 1a and the non-metallic frame 1b can be easily suppressed.

[0056] 5 is preferably sandwiched between the metal frame 1a and the non-metal frame 1b, similar to the packing 4b shown in FIG. 4. In other words, the packing 4c is preferably compressed between the metal frame 1a and the non-metal frame 1b. This improves the sealing performance between the metal frame 1a and the non-metal frame 1b, and further reduces air leakage between the metal frame 1a and the non-metal frame 1b.

[0057] Here, the packing material 4c shown in Fig. 5 has a locked portion 32 that is locked with the locking portion 31 of the non-metallic frame 1b. As shown in Fig. 5, the packing material 4c is pressed against the metal frame 1a with the locked portion 32 locked with the locking portion 31 of the non-metallic frame 1b. As a result, the packing material 4c shown in Fig. 5 is sandwiched between the metal frame 1a and the non-metallic frame 1b.

[0058] Specifically, the packing material 4c shown in FIG. 5 includes a plate-shaped body 41, a head 42, and a neck 43. The head 42 and the neck 43 are formed as protrusions protruding from the body 41. In contrast, the non-metallic frame 1b shown in FIG. 5 includes a hole 44 into which the head 42 of the packing material 4c fits. The head 42 of the packing material 4c elastically deforms as it enters the hole 44 of the non-metallic frame 1b, and after it leaves the hole 44, it returns to its natural shape due to its restoring force. In other words, the head 42 of the packing material 4c returns to its natural shape by passing through the hole 44 of the non-metallic frame 1b, preventing it from coming out of the hole 44. In this way, the packing material 4c shown in FIG. 5 is engaged with the non-metallic frame 1b by the head 42 passing through the hole 44. In other words, the engaged portion 32 of the packing material 4c shown in FIG. 5 is formed by the head 42 and the neck 43. 5. The locking portion 31 of the non-metallic frame 1b shown in FIG.

[0059] 5, the locking portion 31 for locking the packing material 4c is provided on the non-metallic frame 1b, but the present invention is not limited to this configuration. The locking portion 31 may also be provided on the metallic frame 1a.

[0060] 5 illustrates the hole 44 as the locking portion 31 and the head 42 and neck 43 of the protrusion as the locked portion 32, but the present invention is not limited to this configuration. The locking portion 31 and the locked portion 32 may have a different configuration.

[0061] As described above, by configuring one of the metal frame 1a and the non-metallic frame 1b to have the locking portion 31, the positional stability of the packing material 4c can be improved, and air leakage between the metal frame 1a and the non-metallic frame 1b can be more reliably suppressed.

[0062] It is preferable that the packing materials 4b and 4c shown in Figures 4 and 5 are also disposed continuously over the entire circumferential area of ​​the sash frame 1. This allows air leakage to be suppressed over the entire circumferential area of ​​the frame. Furthermore, the packing materials 4b and 4c shown in Figures 4 and 5 are also disposed in a position in the thickness direction A of the exterior wall 101 between the airtightness line AL1 of the exterior wall 101 and the airtightness line AL2 of the opening 101a formed by the sash frame 1 and the panel material 2 fitted into this sash frame 1. This allows air leakage through the gap between the metal frame 1a and the non-metal frame 1b to be efficiently suppressed.

[0063] The sash airtight structure and building according to the present invention are not limited to the specific configurations shown in the above-described embodiments and modifications, and various modifications, alterations, and combinations are possible without departing from the scope of the claims. For example, the airtight member 4 may be configured to include any two or all of the airtight tape 4a shown in Fig. 3, the packing material 4b shown in Fig. 4, and the packing material 4c shown in Fig. 5. [Industrial Applicability]

[0064] The present invention relates to a sash airtight structure and a building. [Explanation of symbols]

[0065] 1: Sash frame 1a: Metal frame 1b: Non-metallic frame 2: Panel material 2a: Outer Shoji 2b: Inner Shoji 3: Interior frame 4: Airtight material 4a: Airtight tape 4b, 4c: Packing material 5: Glass plate 6:Stile 10: Sash airtight structure 21: Vertical frame 21a: Metal vertical frame 21b: Non-metallic vertical frame 22: Upper horizontal frame 22a: Metal upper horizontal frame 22b: Non-metal upper horizontal frame 23: Bottom horizontal frame 23a: Metal lower horizontal frame 23b: Non-metallic lower horizontal frame 31: Locking part 32: Non-locking part 41: Torso 42: Head (an example of a part of the engaging part) 43: Neck portion (an example of a part of the engaging portion) 44: Hole (an example of a locking portion) 100: Building 101: Exterior wall 101a: Opening 102: Exterior material 103:Insulation material 104: Interior materials 105: Sealant 106: Opening reinforcement member A: Thickness direction of the exterior wall BL: Boundary between metal frame and non-metal frame

Claims

1. A sash airtight structure comprising a sash frame disposed in an opening formed in an outer wall, The sash frame is A metal frame located on the outdoor side, a non-metallic frame connected to the indoor side of the metal frame, an airtight member in contact with a surface of the metal frame and a surface of the non-metal frame of the sash frame; The sash airtight structure includes an airtight member arranged to straddle the boundary between the metal frame and the non-metal frame, and including an airtight tape attached to each of the metal frame and the non-metal frame.

2. A sash airtight structure comprising a sash frame disposed in an opening formed in an exterior wall, The sash frame is A metal frame located on the outdoor side, a non-metallic frame connected to the indoor side of the metal frame, an airtight member in contact with a surface of the metal frame and a surface of the non-metal frame of the sash frame; The airtight sash structure, wherein the airtight member is disposed continuously over the entire area of ​​the sash frame in the frame circumferential direction.

3. A building equipped with a sash airtight structure, The sash airtight structure includes a sash frame disposed in an opening formed in an outer wall, The sash frame is A metal frame located on the outdoor side, a non-metallic frame connected to the indoor side of the metal frame, The sash airtight structure includes an airtight member in contact with a surface of the metal frame and a surface of the non-metal frame of the sash frame, A building in which the airtight member is positioned in a position in the thickness direction of the exterior wall between the airtight line of the exterior wall and the airtight line at the opening formed by the sash frame and the panel material fitted into the sash frame.

4. 3. The airtight sash structure according to claim 1, wherein the metal frame is made of aluminum and the non-metal frame is made of resin.

5. 5. The sash airtight structure according to claim 1, wherein the airtight member includes a packing material disposed between the metal frame and the non-metal frame.

6. The sash airtight structure according to claim 5 , wherein the packing material is sandwiched between the metal frame and the non-metal frame.

7. the packing material has a locked portion that is locked to one of the locking portions of the metal frame and the non-metal frame, The sash airtight structure according to claim 6, wherein the packing material is pressed against the other of the metal frame and the non-metal frame with the engaged portion engaged with the one of the engaging portions.

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