JP6319639B2 - Airtight structure around the sash - Google Patents

Description

  The present invention closes the space between the sash frame that supports the sash of the building opening and the inner wall frame formed on the indoor side of the building opening with an airtight material, maintains airtightness around the sash, and has various widths. It is related to the airtight structure around the sash that can accommodate the opening of the building and the outer wall of various thicknesses.

  Leakage from the sash frame and dew condensation due to temperature difference between indoor and outdoor are likely to occur at the boundary between the sash frame provided at the opening of the building and the inner wall. If air containing moisture or moisture enters the wall, it may cause corrosion of each member, and in cold districts, moisture may freeze inside the outer wall material, causing frost damage such as breaking the outer wall material. It has been considered important to improve the airtightness and waterproofing around the sash.

  For example, in Patent Document 1, a water-stop sheet processed in the field according to the shape of the opening of a building where a sash is installed is installed in the lower frame and corner of the opening so as to cover the seam portion of the water-stop sheet. There has been proposed a technique for improving the waterproof property around the sash by sticking a waterproof covering material to the sash.

  In such a construction method, since the waterproof sheet is processed in the field, it can be flexibly constructed according to the shape of the opening. Moreover, since the water stop sheet | seat of the lower frame and corner part of a building opening part is divided | segmented into two, a water stop sheet | seat can be easily installed also in the corner part where a shape is complicated and it becomes difficult to construct.

JP 2002-168056 A

  However, in the construction method of Patent Document 1, it is necessary to make fine cuts in the water-stop sheet each time according to the width and depth of the building opening, and in particular, cutting work at corners is difficult for inexperienced installers. In addition to the time and effort required for construction, there is a risk of construction failure. In addition, it is possible to prevent moisture from entering under the sash frame, but because no water-stopping measures are taken at the boundary with the inner wall part that contacts the sash frame, condensed water generated on the indoor window surface, There is a problem that there is a possibility of entering the wall body along the boundary between the sash frame and the inner wall.

  Therefore, the present invention maintains airtightness between the sash frame that supports the sash of the building opening and the inner wall frame formed on the indoor side of the building opening, thereby increasing the amount of water and moisture in the wall. An object of the present invention is to provide an airtight structure around a sash that can easily and flexibly cope with openings of various widths and outer walls of various thicknesses while preventing air from entering.

The airtight structure around the sash according to the present invention includes a sash frame that supports a sash of a building opening, an inner wall frame formed on the indoor side of the building opening, and a corner of an indoor side finding surface of the sash frame. Attaching to the interior side of the sash frame, sticking to the expected surface of the inner wall portion located on the indoor side of the sash frame, and sticking to the corner portion of the expected surface of the inner wall frame And a second airtight member that extends in the direction of the indoor-side finding surface of the inner wall frame and abuts against the indoor-side finding surface of the inner wall frame, and maintains the shape, the first airtight material, and the second A flexible airtight sheet that is bonded across an airtight material and is attached to the expected surface of the inner wall and the expected surface of the inner wall frame, and the first airtight material is A part of the sash frame that is attached to the corner of the indoor-side finding surface and abuts on the expected surface of the inner wall. The periphery of the contact portion between the inner wall frame and the inner wall is reinforced with a first reinforcing material that maintains waterproofness and airtightness, and the second airtight material is attached to the corner of the expected surface of the inner wall frame. A feature of the present invention is to reinforce the periphery of the contact portion with the portion that comes into contact with the indoor-side finding surface of the frame with a second reinforcing material .

  In the airtight structure around the sash according to the present invention, the first airtight material is formed in parallel to the finding surface of the sash frame, and the indoor side finding surface of the vertical frame and the horizontal frame of the sash frame Side-view L-shaped sash-attached portions attached to the corners, and the sash-attached portions of the L-shaped sash-attached portions are formed in parallel to the vertical frame and the horizontal frame. It has an angle-shaped connecting portion that extends in an indoor direction from an outer end that is a side end that forms a corner portion, to which the airtight sheet is attached.

  In the airtight structure around the sash of the present invention, the second airtight material is formed in parallel to the expected surfaces of the vertical and horizontal frames of the inner wall frame, and the angle-like prospective sticking to which the airtight sheet is attached. The appearance of the inner wall frame from one side end formed in parallel with the attachment surface and the finding surface of the inner wall frame, and forming an L-shaped corner of the expected adhesion portion. It has an L-shaped locating portion that extends to the abutting surface and is in contact with the locating surface of the inner wall frame.

  According to the airtight structure around the sash of the present invention, since the airtight material is divided into three kinds of the first airtight material, the second airtight material and the airtight sheet, the building opening portion with various widths and various thicknesses It is possible to construct easily and flexibly according to the outer wall of the building, and the position of each airtight material can be finely adjusted, so an airtight structure around the sash should be constructed while absorbing the construction error of the sash and wall Can do. Moreover, since the airtight material stuck to the corner portion of the indoor-side finding surface of the sash frame and the corner portion of the prospective surface of the inner wall frame is divided into a first airtight material and a second airtight material that retain the shape. In addition, it is not necessary to perform on-site processing, and the airtight material can be easily brought into close contact with corners and corners around the sash where the shape is complicated and construction is difficult, and workability can be improved.

  According to the airtight structure around the sash of the present invention, the sash sticking portion of the first airtight material and the connecting portion are continuously continuous, so the boundary between the corner portion of the indoor side finding surface of the sash frame and the inner wall portion. Therefore, it is possible to prevent water containing moisture or air from entering the wall. In addition, since the connecting portion extends in the indoor direction, the airtight sheet can be securely attached to the connecting portion, and the airtight sheet can be joined from the sash frame via the first airtight material without any gap.

  According to the airtight structure around the sash of the present invention, since the prospective sticking part and the finding part of the second hermetic material are seamlessly continuous, air containing water and moisture from the corner of the prospective surface of the inner wall frame. Can be prevented from entering the wall. Moreover, an airtight sheet | seat can be reliably affixed on a prospective sticking part, and an airtight sheet | seat can be joined without a gap from an inner wall frame via a 2nd airtight material.

Sectional drawing which shows the airtight structure around a sash. The top view which shows the airtight structure around a sash. The perspective view explaining the installation condition to the building outer wall of a sash frame. The perspective view explaining the installation condition to the building outer wall of an inner wall frame. The perspective view which shows the external appearance structure of a 1st airtight material. The perspective view which shows the external appearance structure of a 2nd airtight material. The perspective view which shows the external appearance structure of an airtight sheet | seat. The perspective view explaining a mode that a 1st airtight material is stuck around a sash. The perspective view explaining a mode that the 2nd airtight material is stuck around the sash. The perspective view explaining a mode that an airtight sheet is stuck around a sash. The elements on larger scale of the circle of FIG. The perspective view which shows the airtight structure around a sash. The perspective view explaining a mode that an airtight sheet is stuck around a sash in case a gap between a sash frame and an inner wall frame is large.

  Hereinafter, the best embodiment of the airtight structure 1 around the sash according to the present invention will be described with reference to the drawings. The airtight structure 1 around the sash of the present embodiment closes the space between the sash frame 3 that supports the sash 31 of the building opening 2 and the inner wall frame 4 formed on the indoor side of the building opening 2 with an airtight material, This is a structure for maintaining the airtightness around the sash 31 and accommodating the building opening 2 with various widths and the building outer wall 8 with various thicknesses.

  The airtight structure 1 around the sash includes a sash frame 3 that supports the sash 31 of the building opening 2, an inner wall frame 4 that is formed on the indoor side of the building opening 2, and an indoor side finding surface 3 a of the sash frame 3. A first hermetic material 5 that is adhered to the corner 3b and maintains the shape; a second airtight material 6 that is adhered to the corner 4b of the expected surface 4a of the inner wall frame 4 and retains the shape; And an airtight sheet 7 having flexibility and closing between the second airtight material 6.

  In the present application, the term “find” refers to an apparent portion of the member seen from the front, and the term “expected” refers to the depth portion of the member relative to the find. Moreover, the finding surface located in the indoor direction is defined as the indoor-side finding surface, and the finding surface located in the outdoor direction is defined as the outdoor-side finding surface.

  Moreover, in this application, maintaining a shape means that when the first airtight member 5 and the second airtight member 6 are attached to predetermined positions of the sash frame 3 or the inner wall frame 4, each part has a desired surface. It refers to being able to touch and maintain that state.

  As shown in FIG. 1 and FIG. 2, the building outer wall 8 is formed on the indoor side of the outer wall portion 9 having the outer wall material 91 facing the outdoors and the inner wall portion having the inner wall material 101 facing the indoors. 10. The building opening 2 in which the sash 31 is disposed is provided through the outer wall 9 and has a rectangular shape corresponding to the shape in the direction in which the sash 31 is found. At the upper and lower boundaries between the building opening 2 and the outer wall material 91, a drainer 91a is provided to prevent rainwater from entering the building. The inner wall 10 forms an inner wall opening 102 corresponding to the position and shape of the building opening 2. As shown in the figure, a functional building material 103 such as a heat insulating material or a humidity control material may be interposed in the inner wall portion 10 as necessary.

  As shown in FIGS. 1 to 3, the sash frame 3 is configured by left and right vertical frames 3 c and upper and lower horizontal frames 3 d being framed in a rectangular shape. The sash frame 3 installed on the inner side in the direction of finding the building opening 2 is fixed to a base material 11 made of C-shaped steel formed around the building opening 2. Four corner portions 3b are formed on the indoor-side finding surface 3a of the sash frame 3 by the vertical frame 3c and the horizontal frame 3d, and a first airtight member 5 to be described later is attached. In addition, a frame 12 provided to cover the boundary between the inner wall material 101 and the inner wall opening 102 is provided at the boundary between the indoor-side finding surface 3 a and the opening of the sash frame 3 in order to fix the frame 12 to the sash frame 3. The angle piece 3e extending to the indoor side is continuously fixed to the four circumferences of the indoor-side finding surface 3a. In addition, as shown in the figure, a shoji 3f made of glass or a panel can be fitted in the sash frame 3, and can be used as a hinged door or a sliding door.

  The inner wall frame 4 is provided facing the inner wall opening 102 in order to fix the frame 12 to the inner wall 10. As shown in FIGS. 1, 2, and 4, the inner wall frame 4 is configured by forming a left and right vertical frame 4 c and an upper and lower horizontal frame 4 d in a rectangular shape, and is installed on the indoor side of the sash frame 3. A corner 4b is formed by a vertical frame 4c and a horizontal frame 4d on a prospective surface 4a of the inner wall frame 4 facing the inner wall opening 102, and a second airtight material 6 to be described later is attached. The expected width and the found width of the inner wall frame 4 are not particularly limited, and have a function as a base on which the expected sticking portion 6a of the second airtight material 6 can be stuck and the frame 12 can be fixed. Any size is acceptable.

  The first airtight material 5 is an airtight material that is adhered to the corner 3b of the indoor-side finding surface 3a of the sash frame 3 and maintains the airtightness of the boundary between the corner 3b and the inner wall 10. As shown in FIGS. 5 and 8, the first airtight member 5 is formed in parallel to the finding surface of the sash frame 3 and is attached to the corner 3 b of the indoor-side finding surface 3 a of the sash frame 3. Side-view L-shaped sash sticking portion 5a and an outer end 5c that is formed in parallel to the prospective surface of the sash frame 3 and is a side end that forms an L-shaped corner 5b of the sash sticking portion 5a. The connecting portion 5d has an angle shape and extends in the indoor direction to which the airtight sheet 7 is attached. Since the outer end 5c of the sash sticking portion 5a and the outer end 5e, which is the side end on the outdoor side forming the L-shape of the connecting portion 5d, are continuous without a break, the first airtight member 5 is attached to the sash frame. By sticking to 3, the air containing water and moisture can be prevented from entering the building outer wall 8 from the boundary between the corner 3b and the inner wall 10. Moreover, since the 1st airtight material 5 which has the sash sticking part 5a and the connection part 5d is shape | molded previously in a factory, when using it at a construction site, it can be used in the state with which the shape was hold | maintained. .

  The surface stuck to the sash frame 3 of the sash sticking part 5a is adhered with a double-sided tape and has adhesiveness, and the sash sticking part 5a can be easily stuck and fixed to the sash frame 3. . The periphery of the contact portion between the L-shaped corner 5b formed by the outer end 5c of the sash sticking portion 5a and the L-shaped corner 5f formed by the outer end 5e of the connecting portion 5d is waterproof and It is reinforced by the reinforcing material 5g having excellent airtightness, and the airtightness at the corner 3b of the sash frame 3 can be more reliably maintained. In addition, the surface stuck to the sash frame 3 of the sash sticking part 5a should just be equipped with adhesiveness equivalent to a double-sided tape, and the adhesion means is not limited to a double-sided tape. Moreover, although the material of the reinforcing material 5g assumes the butyl tape excellent in waterproofness and confidentiality, if this is provided with the equivalent function, it will not be limited to this.

  The size of the first hermetic material 5 is not particularly limited, but the width of one piece forming the angle shape of the connecting portion 5d is about 85 to 90 mm in the longitudinal direction and the width in the short direction is about 40 mm. It is preferable that the width of one side where the L-shape of the sticking part 5a is not formed is about 10 mm. If it is such a size, the airtight sheet | seat 7 mentioned later can be stuck to the connection part 5d, and sufficient airtightness can be maintained in the boundary of the corner | angular part 3b of the sash frame 3, and the inner wall part 10. FIG. It can be done smoothly.

  The 2nd airtight material 6 is stuck to the corner part 4b of the prospective surface 4a of the inner wall frame 4, and the airtight material which hold | maintains the airtightness of the corner part 4b of the inner wall frame 4 by laminating | stacking the airtight sheet | seat 7 from upper direction. It is. As shown in FIG.6 and FIG.9, the 2nd airtight material 6 is formed in parallel with the expectation surface 4a of the inner wall frame 4, and the angle-like expectation sticking part 6a to which the airtight sheet 7 is stuck, The inner wall frame 4 is seen from the side end 6c which is formed in parallel to the finding surface 4e of the inner wall frame 4 and is one of the side edges 6b forming the L-shaped corner portion 6b of the prospective attaching portion 6a. An L-shaped finding portion 6d that extends to the attaching surface 4e and contacts the finding surface 4e of the inner wall frame 4 is provided. The side end 6c of the expected sticking part 6a and the inner end 6e forming the L-shaped corner part 6f of the finding part 6d are continuous without any break, and the second airtight material 6 is pasted to the inner wall frame 4. By wearing it, it is possible to prevent air including water and air from entering the building outer wall 8 from the corner 4b of the inner wall frame 4. Moreover, since the 2nd airtight material 6 which has the prospective adhesion part 6a and the finding part 6d is shape | molded previously in a factory, when using it at a construction site, it can be used in the state with which the shape was hold | maintained. it can.

  The surface to be attached to the expected surface 4a of the inner wall frame 4 of the expected adhesion part 6a has a double-sided tape and is sticky. The expected adhesion part 6a is easily adhered and fixed to the inner wall frame 4. can do. Further, the periphery of the contact portion between the L-shaped corner 6b formed by the side end 6c of the prospective sticking portion 6a and the L-shaped corner 6f formed by the inner end 6e of the fitting portion 6d is as follows. Reinforced by a reinforcing material 6g having excellent waterproofness and airtightness, the airtightness at the corner 4a of the inner wall frame 4 can be more reliably maintained. In addition, the surface stuck to the inner wall frame 4 of the prospective sticking part 6a should just be equipped with adhesiveness equivalent to a double-sided tape, and the adhesion means is not limited to a double-sided tape. Further, the reinforcing material 6g is assumed to be a butyl tape excellent in waterproofness and confidentiality, but this is not limited to this as long as it has an equivalent function.

  Although it does not specifically limit about the magnitude | size of the 2nd airtight material 6, The width | variety of the longitudinal direction of the piece which forms the angle shape of the prospective sticking part 6a shall be about 85-90 mm, and the width | variety of a transversal direction shall be about 40 mm. It is preferable that the width of one side where the L-shape of the finding portion 6d is not formed is about 10 mm. If it is such a magnitude | size, the airtight sheet | seat 7 mentioned later can be stuck on the expectation sticking part 6a, and construction can be performed smoothly.

  The material of the first airtight material 5 and the second airtight material 6 is assumed to be a hard resin excellent in airtightness and waterproofness, but is not limited to this as long as it has equivalent performance. .

  The airtight sheet 7 is a flexible sheet that closes the gap between the first airtight material 5 adhered to the sash frame 3 and the second airtight material 6 adhered to the inner wall frame 4. Although the material of the airtight sheet | seat 7 is not specifically limited, The synthetic resin tape which has airtightness and flexibility is assumed. Further, as shown in FIG. 7, one surface of the airtight sheet 7 includes an adhesive portion 7 a having adhesiveness, and the adhesive portion 7 a is connected to the connecting portion 5 d of the first airtight material 5 and the second airtight material 6. The first airtight member 5 and the second airtight member 6 can be joined together by sticking so as to straddle the expected sticking part 6a.

  Next, the construction procedure of the airtight structure 1 around the sash using the first airtight member 5, the second airtight member 6, and the airtight sheet 7 will be described. First, the first hermetic member 5 is fixed to the four corners of the sash frame 3 fixed inside with respect to the direction in which the building opening 2 is found so that no gaps are generated. At this time, as shown in FIG. 8, the sash sticking part 5a of the first hermetic seal member 5, the outer end 5c forming the L-shaped corner 5b of the sash sticking part 5a, and the building opening 2 The two sides forming the corner 3b of the indoor-side finding surface 3a of the sash frame 3 are attached to the sash frame 3 so as to match with each other. The connecting portion 5d comes into contact with the expected surface of the inner wall portion 10 located on the indoor side of the sash frame 3 by fixing the sash sticking portion 5a to the sash frame 3. As described above, the first hermetic material 5 is preliminarily molded and brought into the construction site in a state in which the shape is maintained, so that it is not necessary to perform on-site processing. When using, the 1st airtight material 5 can be easily fixed to the sash frame 3 only by sticking the sash sticking part 5a in which the double-sided tape was stuck to the sash frame 3. FIG.

  Next, as shown in FIG. 9, the second airtight member 6 is fixed so that there are no gaps at the four corners of the inner wall frame 4 installed on the indoor side of the sash frame 3. At this time, the prospective sticking part 6a of the second airtight member 6 is connected to the indoor side edge 6c forming the L-shaped corner 6b of the prospective sticking part 6a and the prospective face 4a of the inner wall frame 4. The position is adjusted so that the two sides forming the corner portion 4b located on the inner side coincide with each other, and are attached to the inner wall frame 4. The finding portion 6d is in contact with the finding surface 4d located on the indoor side of the inner wall frame 4 by fixing the prospecting attaching portion 6a to the expecting surface 4a of the inner wall frame 4. As described above, the second airtight material 6 is molded in advance and is carried into the construction site in a state in which the shape is maintained, so that it is not necessary to perform on-site processing. When using, the 2nd airtight material 6 can be easily fixed to the inner wall frame 4 only by sticking the prospective sticking part 6a in which the double-sided tape was stuck to the inner wall frame 4. FIG.

  In addition, in FIG. 9 etc., although the 2nd airtight material 6 is arrange | positioned in the corner part 4b located in the indoor side of the inner wall frame 4, it is not limited to this, The 2nd airtight material 6 is used for the inner wall frame. 4 may be arranged at the corner 4b located on the outdoor side. In that case, the corner | angular part located in the outdoor side of the one side end 6c of the outdoor side which forms the L-shaped corner | angular part 6b of the prospective sticking part 6a, and the prospective surface 4a of the inner wall frame 4 in the prospective sticking part 6a The position is adjusted so that the two sides forming the part 4b coincide with each other and are attached to the inner wall frame 4. The finding portion 6d comes into contact with the finding surface 4c located on the outdoor side of the inner wall frame 4 by fixing the prospecting attaching portion 6a to the expecting surface 4a of the inner wall frame 4.

  As described above, since the first airtight material 5 and the second airtight material 6 are divided, the airtight materials are separated from the corner portions 3b of the sash frame 3, respectively, regardless of the width of the sash frame 3 and the inner wall frame 4. The inner wall frame 4 can be securely attached to the corner 4b. Moreover, since the position of each airtight material can be finely adjusted, the airtight structure can be constructed while absorbing the construction error of the sash frame 3 and the building outer wall 8.

  Next, as shown in FIG.10 and FIG.11, the airtight sheet | seat 7 is arrange | positioned so that the connection part 5d of the 1st airtight material 5, and the attachment part 6a of the 2nd airtight material 6 may be straddled, FIG. As shown in the figure, continuous bonding and fixing is performed so that no gaps are formed around the prospective surface of the inner wall portion 10 and the prospective surface 4a of the inner wall frame 4 positioned between the sash frame 3 and the inner wall frame 4. As described above, since the airtight sheet 7 is a flexible sheet, the airtight sheet 7 should be flexibly attached around the sash according to the shape of the inner wall opening 102 and the distance between the sash frame 3 and the inner wall frame 4. Can do. For example, when the distance between the sash frame 3 and the inner wall frame 4 is large and the airtight sheet 7 cannot straddle the first airtight material 5 and the second airtight material 6, the end of the airtight sheet 7 is arranged as shown in FIG. The airtight sheets 7 at both ends that have been laminated and pasted together can be adhered to the connecting portion 5d of the first airtight material 5 and the attachment portion 6a of the second airtight material 6, respectively. On the other hand, when the distance between the sash frame 3 and the inner wall frame 4 is small, although not shown, the connecting portion 5d of the first hermetic material 5 and the attachment portion 6a of the second hermetic material 6 The airtight sheet 7 can be stuck from above.

The airtight sheet 7 needs to be processed on site according to the shape of the inner wall opening 102 and the thickness of the inner wall 10. However, as described above, the airtight structure is already constructed by the first airtight material 5 and the second airtight material 6 for the corner portion 3b of the sash frame 3 and the corner portion 4b of the inner wall frame 4 which are complicated shapes. Therefore, the airtight sheet 7 does not need to be treated. Therefore, the airtight sheet 7 only needs to be processed in accordance with the rectangular shape of the inner wall opening 102 which is a simple shape.

  Here, the case of the waist window has been described, but the airtight structure 1 around the sash of the present application can also be used for the sweep window. In the case of the sweep-out window, the sash frame 3 is a three-way frame without the lower horizontal frame 3d. Therefore, an airtight structure may be provided for the left and right vertical frames 3c and the upper horizontal frame 3d of the sash frame 3. Accordingly, the first hermetic material 5 is fixed to the two corners formed by the left and right vertical frames 3c and the upper horizontal frame 3b of the sash frame 3, and the second airtight material 6 is fixed to the left and right vertical frames 4c of the inner wall frame 4 and The airtight sheet 7 is fixed to two corners formed by the upper horizontal frame 4d, and the airtight sheet 7 is continuously adhered to the expected surface of the inner wall portion 10 and the expected surface 4a of the inner wall frame 4 positioned between the sash frame 3 and the inner wall frame 4. Fix it.

  Needless to say, the embodiment of the present invention is not limited to the above-described embodiment, and can be appropriately changed without departing from the scope of the idea of the present invention.

  The airtight structure 1 around the sash according to the present invention can be suitably used for building openings 2 of various widths and building outer walls 8 of various thicknesses, regardless of the use of the building.

DESCRIPTION OF SYMBOLS 1 Airtight structure around sash 2 Building opening part 3 Sash frame 31 Sash 3a Indoor side face 3b Corner | angular part 3c Vertical frame 3d Horizontal frame 4 Inner wall frame 4a Expected surface 4b Corner | angular part 4c Vertical frame 4d Horizontal frame 5 1st airtight material 5a Sash sticking part 5b Corner part 5c Outer end 5d Connection part 6 2nd airtight material 6a Expected sticking part 6b Corner part 6c One side end 6d Finding part 7 Airtight tape

Claims (3)

A sash frame that supports the sash of the building opening,
An inner wall frame formed on the indoor side of the building opening;
A first airtight material that sticks to a corner of the indoor-side finding surface of the sash frame and extends to the indoor side, contacts the expected surface of the inner wall located on the indoor side of the sash frame, and maintains the shape;
A second adhesive that sticks to the corner of the expected surface of the inner wall frame and extends in the direction of the indoor-side finding surface of the inner wall frame, abuts on the indoor-side finding surface of the inner wall frame, and maintains the shape Airtight material,
A flexible airtight sheet that is bonded across the first airtight material and the second airtight material , and is attached to the expected surface of the inner wall portion and the expected surface of the inner wall frame. Prepared,
The first hermetic material is waterproof and airtight around a contact portion between a portion attached to the corner portion of the indoor-side finding surface of the sash frame and a portion contacting the expected surface of the inner wall portion. Reinforce with the first reinforcement to hold,
The second hermetic material is a second reinforcing material around a contact portion between a portion attached to the corner portion of the expected surface of the inner wall frame and a portion contacting the indoor-side finding surface of the inner wall frame. Airtight structure around the sash, characterized by reinforcement .   The first airtight material is formed in parallel to the sash frame finding surface, and is attached to the corners of the indoor side locating surface of the vertical and horizontal frames of the sash frame. The outer side which is a side edge which forms the L-shaped corner of the sash sticking part, and is formed in parallel to the vertical frame and the prospective surface of the horizontal frame of the sash sticking part. 2. The airtight structure around the sash according to claim 1, further comprising an angle-shaped connecting portion that extends in an indoor direction from the end and to which the airtight sheet is attached.   The second hermetic material is formed in parallel to the prospective surfaces of the vertical and horizontal frames of the inner wall frame, and includes an angle-like prospective attaching portion to which the airtight sheet is attached, and the inner wall frame. The inner wall frame is formed in parallel to the attachment surface and extends from one side end of the prospective sticking portion that forms an L-shaped corner to the attachment surface of the inner wall frame. The airtight structure around the sash according to claim 1, further comprising an L-shaped locating portion that is in contact with the locating surface.

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