Ventilation structure in corners and buildings

Abstract

To provide a ventilation structure and building for inner corners that allows for the use of standardized trim materials. [Solution] A trim piece 20 is placed at the inner corner C where the outdoor surface 10a of the exterior wall 10 and the lower surface 11a of the overhang 11 intersect. The trim piece 20 has a first member 21 and a second member 22. The second member 22 is positioned on the indoor side of the first member 21, with a gap between them. The lower surface member 13 that constitutes the lower surface 11a of the overhang 11 is sandwiched between the first member 21 and the second member 22. The inner corner ventilation passage R20 is partitioned by the first member 21 and the second member 22. The first member 21 is provided with a first communication hole 24a that connects the outdoors and the inner corner ventilation passage R20, and a restricting portion 28 that restricts water from entering the inner corner ventilation passage R20 from the outdoors through the first communication hole 24a.

Description

Technical Field

[0001] The present disclosure relates to a ventilation structure for a corner portion and a building.

Background Art

[0002] The building described in Patent Document 1 has a corner portion where an outer wall and an eaves ceiling board intersect. The upper surface of the outer wall material of the outer wall is located below the lower surface of the eaves ceiling board. That is, the corner portion has a configuration where the eaves ceiling board is higher and the outer wall material is lower. A soffit ventilation fitting is arranged at the corner portion. The soffit ventilation fitting has an upper plate located above the eaves ceiling board, a lower plate located below the eaves ceiling board, and a connecting portion connecting the upper plate and the lower plate. The soffit ventilation fitting is arranged so as to sandwich the eaves ceiling board between the upper plate and the lower plate.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] There are multiple types of eaves ceiling board thicknesses according to the specifications of the eaves. Therefore, it is necessary to prepare multiple types of soffit ventilation fittings according to the thickness of the eaves ceiling board. [[ID=三十六]]

Means for Solving the Problems

[0005] [[ID=四十一]] (1) A ventilation structure for an inner corner that solves the above problem is a ventilation structure for an inner corner where the outdoor side surface of an outer wall and the lower surface of an overhang that is located above the outer wall and extends outward from the outer wall intersect, wherein in the inner corner, the upper surface of the outer wall material of the outer wall is located below the lower surface of the lower surface member of the overhang, and a trim material is provided in the inner corner, the trim material has a first member and a second member that is spaced apart from the first member and located more indoor than the first member, the lower surface member is sandwiched between the first member and the second member, the inner corner ventilation passage is partitioned by the first member and the second member, the first member is provided with a first communication hole that connects the outside and the inner corner ventilation passage, and a restricting part that restricts water from entering the inner corner ventilation passage from the outside through the first communication hole.

[0006] With this configuration, the trim is divided into two parts, a first member and a second member. By setting the distance between the first member and the second member according to the thickness of the bottom member, the trim can be standardized for multiple types of bottom members with different thicknesses. Furthermore, since the first member is provided with a restricting section, water is less likely to enter the corner ventilation passage from the outside through the first communication hole.

[0007] (2) In the ventilation structure of the inner corner described in (1) above, the second member is provided with a second communication hole that connects the inner corner ventilation passage with the attic. With this configuration, the attic is connected to the outdoors via a corner ventilation passage, thus ensuring proper ventilation in the attic.

[0008] (3) In the ventilation structure of the inner corner described in (1) or (2) above, an inner wall ventilation layer is provided on the indoor side of the outer wall material, the first member has a first horizontal plate portion arranged on the lower surface of the lower surface member and a first vertical plate portion extending downward from the indoor end of the first horizontal plate portion, the second member has a second horizontal plate portion arranged on the upper surface of the lower surface member and a second vertical plate portion extending downward from the indoor end of the second horizontal plate portion and located on the indoor side of the first vertical plate portion, the inner corner ventilation passage has a horizontal passage partitioned by the first horizontal plate portion and the second horizontal plate portion and a vertical passage partitioned by the first vertical plate portion and the second vertical plate portion, the vertical passage is connected to the inner wall ventilation layer. With this configuration, the ventilation layer inside the exterior wall is connected to the outdoors via an inside corner ventilation passage, thus ensuring ventilation in the ventilation layer inside the exterior wall.

[0009] (4) In the ventilation structure of the inner corner described in (3) above, the first communication hole is provided in the first horizontal plate, and the first member is provided with a weir that protrudes upward from the portion of the first horizontal plate that is located on the indoor side of the first communication hole.

[0010] With this configuration, even if water enters the horizontal passage of the corner ventilation passage through the first connecting hole, the water that enters is blocked by the weir, making it difficult for water to enter the vertical passage. Therefore, it is difficult for water to enter the ventilation layer inside the exterior wall that is connected to the vertical passage.

[0011] (5) In the ventilation structure of the inner corner described in (3) or (4) above, when the direction in which the overhang extends outward from the outer wall is defined as the first direction and the direction perpendicular to the first direction is defined as the second direction, a plurality of base materials are arranged at intervals in the second direction, and the trim material has a spacer that is placed between the first vertical plate and the second vertical plate, and the spacer is placed in the position where the base material is provided in the second direction.

[0012] With this configuration, the dimensions of the vertical passage in the first direction can be set to the desired dimensions simply by placing a spacer between the first and second vertical plate sections. Furthermore, since the vertical passage is not blocked by the spacer, ventilation of the ventilation layer inside the exterior wall can be ensured.

[0013] (6) In the ventilation structure of the inner corner described in (5) above, the trim material is fixed to the base material by a fixing member that penetrates the first vertical plate, the spacer, and the second vertical plate, and the first vertical plate is provided with an insertion hole through which the fixing member is inserted, and the insertion hole is an elongated hole extending in the vertical direction.

[0014] As described above, the spacing between the first and second members is set according to the thickness of the lower member, so the vertical position of the fixing member that penetrates the first vertical plate differs for each trim piece. With the above configuration, since the insertion hole is an elongated hole extending in the vertical direction, the fixing member can be inserted into the insertion hole even if the vertical position of the fixing member differs for each trim piece.

[0015] (7) In any one of the corner ventilation structures described in (3) to (6) above, the first communication hole is provided in the first horizontal plate, and the restricting portion is composed of a valve body that operates to close the first communication hole by wind pressure. With this configuration, in the event of a storm, the valve body closes the first communication hole, which further restricts rainwater from entering the corner ventilation passage through the first communication hole.

[0016] (8) In the ventilation structure of the inner corner described in (7) above, the valve body is rotatably mounted on the portion of the first horizontal plate that is located on the outdoor side of the first communication hole. In this configuration, the valve body rotates due to the wind pressure from the outside to the inside, thereby closing the first communication hole.

[0017] (9) In the ventilation structure of the inner corner described in (7) above, the valve body is rotatably mounted to the portion of the first horizontal plate that is located on the indoor side of the first communication hole.

[0018] The wind flowing from the outside to the inside of the house hits the outside surface of the first vertical plate portion and then turns back. According to the above configuration, the valve body rotates by the wind pressure of the turned-back wind, thereby closing the first communication hole.

[0019] (10) In the ventilation structure of the inner corner portion of the above (9), a guiding portion for guiding the wind toward the valve body is provided on the outside surface of the first vertical plate portion. According to this configuration, when the wind hits the outside surface of the first vertical plate portion and turns back, it is guided toward the valve body by the guiding portion. Therefore, the valve body can be rotated efficiently.

[0020] (11) The building that solves the above problems has a ventilation structure for the inner corner portion of any one of the above (1) to (10). According to this configuration, since the partition material is divided into two parts, namely the first member and the second member, by setting the distance between the first member and the second member according to the thickness of the lower surface member, the partition material can be made common for a plurality of types of lower surface members having different thicknesses.

[0021] Also, since a regulating portion is provided on the first member, it is difficult for water to enter the inner corner ventilation passage from the outside through the first communication hole.

Effect of the Invention

[0022] According to the ventilation structure of the inner corner portion and the building of the present disclosure, the partition material can be made common.

Brief Description of the Drawings

[0023] A schematic diagram of a building. [Figure 1] It is a cross-sectional view of the inner corner portion of a building. [Figure 2] It is a perspective view of the first member. [Figure 3] It is a perspective view of the second member. [Figure 4] It is a cross-sectional view of the outer wall along the line 5-5 in FIG. 2. [Figure 5] It is a cross-sectional view of the outer wall along the line 5-5 in FIG. 2. [Figure 6] This is a cross-sectional view of the trim material in the modified example. [Figure 7] This is a cross-sectional view of the trim material in the modified example. [Figure 8] This is a bottom view of the first component in the modified example. [Figure 9] This is a cross-sectional view of the trim material in the modified example. [Modes for carrying out the invention]

[0024] Referring to Figures 1 to 5, the ventilation structure of the inner corner C and the building 100 of this embodiment will be described. The building 100 of this embodiment is a two-story house. As shown in Figure 1, the building 100 comprises an exterior wall 10 and an overhang 11 located above the exterior wall 10 and extending outward from the exterior wall 10. In this embodiment, the exterior wall 10 is the exterior wall of the first floor of the building 100. The overhang 11 is part of the second floor of the building 100. In the horizontal direction, the direction in which the overhang 11 extends outward from the exterior wall 10 is defined as the first direction D1, and the direction perpendicular to the first direction D1 is defined as the second direction D2.

[0025] As shown in Figure 2, the overhang 11 has a truss 12 and a lower surface member 13. Multiple trusses 12 are arranged at intervals in the second direction D2. The lower surface member 13 is located below the trusses 12. The lower surface 13a of the lower surface member 13 constitutes the lower surface 11a of the overhang 11.

[0026] The exterior wall 10 comprises an exterior wall material 14, a base panel 15, and base columns 16. The base panel 15 is located on the interior side of the exterior wall material 14. An interior ventilation layer R11 is provided between the exterior wall material 14 and the base panel 15. Therefore, the interior ventilation layer R11 is located on the interior side of the exterior wall material 14. The base columns 16 are located on the interior side of the base panel 15. Multiple base columns 16 are arranged at intervals in the second direction D2 (see Figure 5).

[0027] The building 100 has an inner corner C where the outdoor surface 10a of the exterior wall 10 and the lower surface 11a of the overhang 11 intersect. The outdoor surface 10a of the exterior wall 10 is composed of the outdoor surface 14a of the exterior wall material 14. At the inner corner C, the upper surface 14c of the exterior wall material 14 is located below the lower surface 11a of the overhang 11. In other words, the inner corner C is constructed with the lower surface member 13 being superior and the exterior wall material 14 inferior. Note that "the upper surface 14c of the exterior wall material 14 is located below the lower surface 11a of the overhang 11" includes not only the case where the upper surface 14c of the exterior wall material 14 is located directly below the lower surface 11a of the overhang 11, but also the case, as in this embodiment, where the upper surface 14c of the exterior wall material 14 is located lower than the lower surface 11a of the overhang 11 when viewed from the first direction D1.

[0028] <Trim material> A trim piece 20 is placed in the inner corner C. The trim piece 20 has a first member 21, a second member 22, and a spacer 23. The first member 21 has a flat first horizontal plate portion 24 and a flat first vertical plate portion 25. The first vertical plate portion 25 is perpendicular to the first horizontal plate portion 24. The second member 22 has a flat second horizontal plate portion 26 and a flat second vertical plate portion 27. The second vertical plate portion 27 is perpendicular to the second horizontal plate portion 26.

[0029] The trim piece 20 is positioned such that the lower member 13 is sandwiched between the first horizontal plate portion 24 and the second horizontal plate portion 26, and the first vertical plate portion 25 and the second vertical plate portion 27 are located in the ventilation layer R11 inside the exterior wall. The second member 22 is positioned at a distance from the first member 21 and on the indoor side of the first member 21.

[0030] More specifically, the first horizontal plate portion 24 is positioned on the lower surface 13a of the lower surface member 13. The first horizontal plate portion 24 extends horizontally. Of the upper surface of the first horizontal plate portion 24, the portion located at the outdoor end of the first horizontal plate portion 24 is in contact with the portion of the lower surface 13a of the lower surface member 13 located at the indoor end of the lower surface member 13. In this embodiment, a gap G exists between the portion of the lower surface of the first horizontal plate portion 24 located on the indoor side of the first horizontal plate portion 24 and the upper surface 14c of the exterior wall material 14. The first vertical plate portion 25 extends downward from the indoor end of the first horizontal plate portion 24. The first vertical plate portion 25 is positioned in the exterior wall ventilation layer R11. The outdoor side surface of the first vertical plate portion 25 is in contact with the indoor side surface 14b of the exterior wall material 14.

[0031] The second horizontal plate portion 26 is positioned on the upper surface 13b of the lower surface member 13. The second horizontal plate portion 26 extends horizontally. The portion of the lower surface of the second horizontal plate portion 26 located at the outdoor end of the second horizontal plate portion 26 is in contact with the portion of the upper surface 13b of the lower surface member 13 located at the indoor end of the lower surface member 13. The second vertical plate portion 27 extends downward from the indoor end of the second horizontal plate portion 26. The second vertical plate portion 27 is positioned in the exterior wall ventilation layer R11. The second vertical plate portion 27 is positioned on the indoor side of the first vertical plate portion 25. The indoor side of the second vertical plate portion 27 is in contact with the base panel 15.

[0032] The corner ventilation passage R20 is partitioned by the first member 21 and the second member 22. The corner ventilation passage R20 has a horizontal passage R20a partitioned by the first horizontal plate portion 24 and the second horizontal plate portion 26, and a vertical passage R20b partitioned by the first vertical plate portion 25 and the second vertical plate portion 27. As described above, the indoor end of the lower surface member 13 is sandwiched between the outdoor end of the first horizontal plate portion 24 and the outdoor end of the second horizontal plate portion 26. Therefore, the first end of the corner ventilation passage R20 is closed by the lower surface member 13. The second end of the corner ventilation passage R20, which is the end opposite to the first end, is connected to the exterior wall internal ventilation layer R11.

[0033] As shown in Figures 2 and 3, the first horizontal plate portion 24 of the first member 21 is provided with a first communication hole 24a. The first communication hole 24a penetrates the first horizontal plate portion 24 in the thickness direction. In this embodiment, the first communication hole 24a is rectangular in plan view. In this embodiment, two first communication holes 24a are provided spaced apart in the second direction D2. The outdoors and the corner ventilation passage R20 are connected via the first communication hole 24a.

[0034] The first horizontal plate portion 24 of the first member 21 is provided with a restricting portion 28 that restricts water from entering the corner ventilation passage R20 from the outside through the first communication hole 24a. The restricting portion 28 in this embodiment is made of a rectangular plate. The restricting portion 28 covers the first communication hole 24a from below so as not to completely block the first communication hole 24a. Specifically, the restricting portion 28 is attached to the portion of the first horizontal plate portion 24 that is located on the outdoor side of the first communication hole 24a. The restricting portion 28 is inclined so as to move away from the first communication hole 24a as it moves towards the indoor side. The inclination angle of the restricting portion 28 with respect to the first horizontal plate portion 24 shown in Figure 2 is an example. The inclination angle of the restricting portion 28 with respect to the first horizontal plate portion 24 may be changed as appropriate.

[0035] The first member 21 is provided with a weir portion 29 that protrudes upward from the portion of the first horizontal plate portion 24 that is located on the indoor side of the first communication hole 24a. In this embodiment, the weir portion 29 protrudes upward from the indoor end of the first horizontal plate portion 24.

[0036] As shown in Figures 2 and 4, the second horizontal plate portion 26 of the second member 22 is provided with a second communication hole 26a. The second communication hole 26a penetrates the second horizontal plate portion 26 in the thickness direction. In this embodiment, the second communication hole 26a is rectangular in plan view. In this embodiment, two second communication holes 26a are provided spaced apart in the second direction D2. The corner ventilation passage R20 and the attic R12 are connected via the second communication hole 26a.

[0037] As shown in Figures 2 and 5, the spacers 23 are positioned between the first vertical plate section 25 and the second vertical plate section 27. The spacers 23 are spaced apart in the second direction D2. More specifically, the spacers 23 are positioned in the second direction D2 where the base columns 16 are provided. That is, the spacers 23 are positioned so as to be aligned with the base columns 16 in the first direction D1 via the base panel 15.

[0038] The trim piece 20 is fixed to the base column 16 by fastening members 17 such as screws or nails. The fastening members 17 penetrate the first vertical plate section 25, the spacer 23, the second vertical plate section 27, and the base panel 15.

[0039] As shown in Figures 2 and 3, the first vertical plate portion 25 of the first member 21 is provided with an insertion hole 25a through which the fixing member 17 is inserted. The insertion hole 25a is an elongated hole extending in the vertical direction. The insertion hole 25a is positioned in the second direction D2 where the spacer 23 is provided. In this embodiment, two insertion holes 25a are provided spaced apart in the second direction D2.

[0040] The first member 21, the second member 22, and the spacer 23 are pre-integrated as a trim piece 20 before being fixed to the base column 16 by the fixing member 17. Specifically, the first member 21 and the second member 22 are temporarily fixed to the spacer 23 by sandwiching the bottom member 13 between the first horizontal plate portion 24 and the second horizontal plate portion 26, and by sandwiching the spacer 23 between the first vertical plate portion 25 and the second vertical plate portion 27. The distance between the first horizontal plate portion 24 and the second horizontal plate portion 26, i.e., the dimension of the horizontal passage R20a in the vertical direction, is determined by the thickness of the bottom member 13. The distance between the first vertical plate portion 25 and the second vertical plate portion 27, i.e., the dimension of the vertical passage R20b in the first direction D1, is determined by the thickness of the spacer 23.

[0041] [Operation of this embodiment] The operation of this embodiment will now be explained. A trim piece 20 is placed in the inner corner C. The trim piece 20 has a first member 21 and a second member 22. The second member 22 is positioned on the indoor side of the first member 21, with a gap between them. The bottom member 13 is sandwiched between the first member 21 and the second member 22.

[0042] With this configuration, since the trim piece 20 is divided into two parts, a first member 21 and a second member 22, the distance between the first member 21 and the second member 22 can be set according to the thickness of the bottom member 13, thereby making the trim piece 20 common to multiple types of bottom members 13 with different thicknesses.

[0043] The corner ventilation passage R20 is partitioned by the first member 21 and the second member 22. The first member 21 is provided with a first communication hole 24a that connects the outside to the corner ventilation passage R20. The second member 22 is provided with a second communication hole 26a that connects the corner ventilation passage R20 to the attic R12. As a result, as shown by the solid arrows in Figure 2, the attic R12 is connected to the outside via the corner ventilation passage R20, thus ensuring ventilation in the attic R12. In addition, the corner ventilation passage R20 is connected to the exterior wall ventilation layer R11. As a result, as shown by the solid arrows in Figure 2, the exterior wall ventilation layer R11 is connected to the outside via the corner ventilation passage R20, thus ensuring ventilation in the exterior wall ventilation layer R11.

[0044] The first member 21 is provided with a restricting portion 28 that restricts water from entering the corner ventilation passage R20 from the outside through the first communication hole 24a. In this embodiment, the restricting portion 28 covers the first communication hole 24a from below so as not to completely block the first communication hole 24a. Specifically, the restricting portion 28 is attached to the portion of the first horizontal plate portion 24 that is located on the outdoor side of the first communication hole 24a. The restricting portion 28 is inclined so as it moves away from the first communication hole 24a towards the indoor side.

[0045] With this configuration, ventilation of the corner ventilation passage R20 can be ensured even if the restricting section 28 is provided. Furthermore, as shown by the dashed arrow in Figure 2, in the event of a storm, rainwater will collide with the restricting section 28, preventing water from entering the corner ventilation passage R20 from the outside through the first communication hole 24a.

[0046] [Effects of this embodiment] The effects of this embodiment will now be explained. (1) Since the trim piece 20 is divided into two parts, a first member 21 and a second member 22, the distance between the first member 21 and the second member 22 can be set according to the thickness of the bottom member 13, thereby making the trim piece 20 common to multiple types of bottom members 13 with different thicknesses.

[0047] Furthermore, since the first member 21 is provided with a restricting section 28, water is less likely to enter the corner ventilation passage R20 from the outside through the first communication hole 24a. (2) The second member 22 is provided with a second communication hole 26a that connects the corner ventilation passage R20 and the attic R12. With this configuration, the attic R12 is connected to the outdoors via the corner ventilation passage R20, so that ventilation of the attic R12 can be ensured.

[0048] (3) An exterior wall ventilation layer R11 is provided on the interior side of the exterior wall material 14. The first member 21 has a first horizontal plate portion 24 and a first vertical plate portion 25. The first horizontal plate portion 24 is located on the lower surface 13a of the lower surface member 13. The first vertical plate portion 25 extends downward from the interior end of the first horizontal plate portion 24. The second member 22 has a second horizontal plate portion 26 and a second vertical plate portion 27. The second horizontal plate portion 26 is located on the upper surface 13b of the lower surface member 13. The second vertical plate portion 27 extends downward from the interior end of the second horizontal plate portion 26. The second vertical plate portion 27 is located on the interior side of the first vertical plate portion 25.

[0049] The corner ventilation passage R20 has a horizontal passage R20a and a vertical passage R20b. The horizontal passage R20a is partitioned by a first horizontal plate section 24 and a second horizontal plate section 26. The vertical passage R20b is partitioned by a first vertical plate section 25 and a second vertical plate section 27. The vertical passage R20b is connected to the exterior wall ventilation layer R11.

[0050] With this configuration, the ventilation layer R11 inside the exterior wall is connected to the outdoors via the corner ventilation passage R20, thus ensuring ventilation of the ventilation layer R11 inside the exterior wall. (4) The first communication hole 24a is provided in the first horizontal plate portion 24. The first member 21 is provided with a weir portion 29 that protrudes upward from the portion of the first horizontal plate portion 24 that is located on the indoor side of the first communication hole 24a.

[0051] With this configuration, even if water enters the horizontal passage R20a of the corner ventilation passage R20 from the first communication hole 24a, the water that enters is blocked by the weir 29, making it difficult for it to enter the vertical passage R20b. Therefore, it is difficult for water to enter the inner ventilation layer R11 of the outer wall, which is connected to the vertical passage R20b.

[0052] (5) The trim piece 20 has a spacer 23 that is positioned between the first vertical plate portion 25 and the second vertical plate portion 27. The spacer 23 is positioned in the second direction D2 where the base column 16 is provided.

[0053] With this configuration, the dimensions of the vertical passage R20b in the first direction D1 can be set to a desired dimension simply by placing a spacer 23 between the first vertical plate section 25 and the second vertical plate section 27. Furthermore, since the vertical passage R20b is not blocked by the spacer 23, ventilation of the ventilation layer R11 inside the exterior wall can be ensured.

[0054] (6) The trim piece 20 is fixed to the base column 16 by a fixing member 17 that penetrates the first vertical plate portion 25, the spacer 23, and the second vertical plate portion 27. The first vertical plate portion 25 is provided with an insertion hole 25a through which the fixing member 17 is inserted. The insertion hole 25a is an elongated hole that extends in the vertical direction.

[0055] As described above, the spacing between the first member 21 and the second member 22 is set according to the thickness of the lower member 13, so the vertical position of the fixing member 17 that penetrates the first vertical plate portion 25 is different for each trim piece 20. Since the insertion hole 25a is an elongated hole that extends in the vertical direction, the fixing member 17 can be inserted through the insertion hole 25a even if the vertical position of the fixing member 17 is different for each trim piece 20.

[0056] (7) In order to ensure the durability of the structure of building 100, it is required to ensure ventilation in the attic R12 and the exterior wall ventilation layer R11. On the other hand, if water enters the attic R12 and the exterior wall ventilation layer R11 along with air, it will cause the structure of building 100 to rot, so it is required to prevent water from entering the attic R12 and the exterior wall ventilation layer R11.

[0057] In this embodiment, ventilation is ensured in the attic R12 and the exterior wall ventilation layer R11 via the corner ventilation passage R20. Furthermore, since the restricting portion 28 restricts the intrusion of water into the corner ventilation passage R20, it is difficult for water to intrude into the attic R12 and the exterior wall ventilation layer R11 connected to the corner ventilation passage R20. Therefore, it is possible to ensure ventilation in the attic R12 and the exterior wall ventilation layer R11 while restricting the intrusion of water into the attic R12 and the exterior wall ventilation layer R11.

[0058] (8) The following example can be considered as a reference technology for the ventilation structure of the inner corner C. The trim material has an upper plate located above the lower member 13, a lower plate located below the lower member 13, and a connecting part that connects the indoor end of the upper plate and the indoor end of the lower plate in the vertical direction. In this case, if there is a gap between the lower plate of the trim material and the upper surface 14c of the exterior wall material 14, water may enter the interior through the gap. For this reason, for example, it is conceivable to seal the gap between the lower plate of the trim material and the upper surface 14c of the exterior wall material 14, or to butt the lower surface of the lower plate with the upper surface 14c of the exterior wall material 14.

[0059] However, when sealing the space between the lower plate and the exterior wall material 14, the ventilation layer R11 inside the exterior wall may be blocked by the sealing material or the backup material used for sealing, potentially impairing the ventilation of the ventilation layer R11 inside the exterior wall. Furthermore, if the thickness of the exterior wall material 14 is thin, sealing itself becomes difficult.

[0060] When the lower plate and the exterior wall material 14 are butted together, installation is difficult. Also, if the fitting of the inner corner C is such that the lower member 13 is superior and the exterior wall material 14 is inferior, the exterior wall material 14 is installed after the lower member 13 and the trim material are installed. The exterior wall material 14 is installed, for example, by being inserted into the exterior wall material support member (not shown) from above so that it is placed on the exterior wall material support member. In this case, if the lower plate and the exterior wall material 14 are butted together, the upper end of the exterior wall material 14 interferes with the already installed trim material, making it impossible to install the exterior wall material 14.

[0061] In contrast, in this embodiment, the first vertical plate portion 25 of the first member 21 is positioned to contact the indoor surface 14b of the exterior wall material 14. Therefore, sealing between the first horizontal plate portion 24 of the first member 21 and the upper surface 14c of the exterior wall material 14 can be omitted. Furthermore, since the first horizontal plate portion 24 and the upper surface 14c of the exterior wall material 14 do not need to be butted together, that is, a gap G may exist between the first horizontal plate portion 24 and the exterior wall material 14, the installation of the exterior wall material 14 becomes easier, and the exterior wall material 14 can be installed by inserting it into the exterior wall material support member from above.

[0062] <Example of changes> The above embodiment is an example of possible forms for the ventilation structure of the inner corner C and the building 100, and is not intended to limit their form. The ventilation structure of the inner corner C and the building 100 may take forms different from those exemplified in the above embodiment. Examples include forms in which some of the configurations of the embodiment are replaced, modified, or omitted, or forms in which new configurations are added to the embodiment. Modifications of the embodiment are shown below.

[0063] The corner ventilation passage R20 may be connected to either the attic R12 or the exterior wall ventilation layer R11, or only one of them. If ventilation of the attic R12 is not required, the second communication hole 26a may not be provided in the second horizontal plate portion 26 of the second member 22. If ventilation of the exterior wall ventilation layer R11 is not required, the corner ventilation passage R20 may not be connected to the exterior wall ventilation layer R11. Even in this case, at least effect (1) of the above embodiment can be obtained.

[0064] The number of first communication holes 24a provided in the first horizontal plate portion 24 of the first member 21 is not limited to two, but may be changed as appropriate. The number of second communication holes 26a provided in the second horizontal plate portion 26 of the second member 22 is not limited to two, but may be changed as appropriate.

[0065] The weir portion 29 of the first member 21 may be omitted. Even in this case, at least the effect (1) of the above embodiment can be obtained. The weir section 29 does not need to be located at the indoor end of the first horizontal plate section 24, as long as it protrudes upward from the portion of the first horizontal plate section 24 that is located on the indoor side of the first communication hole 24a in the first horizontal plate section 24.

[0066] The insertion hole 25a of the first member 21 does not have to be an elongated hole extending in the vertical direction. Even in this case, at least the effect (1) of the above embodiment can be obtained. As shown in the first modification example in Figure 6 and the second modification examples in Figures 7 to 9, the regulating section 28 may be composed of a valve body 30 that operates to close the first communication hole 24a due to wind pressure. With this configuration, in the event of a storm, the valve body 30 closes the first communication hole 24a, thereby further restricting the intrusion of rainwater into the corner ventilation passage R20 through the first communication hole 24a. The first and second modification examples will be described in detail below.

[0067] [Example of first change] As shown in Figure 6, the valve body 30 of the first modified example is rotatably mounted via a hinge 33 to the portion of the first horizontal plate portion 24 that is located on the outdoor side of the first communication hole 24a.

[0068] In the absence of wind, as shown by the solid line in Figure 6, the valve body 30 covers the first communication hole 24a from below so as not to completely block the first communication hole 24a. More specifically, the valve body 30 is inclined so as to move away from the first communication hole 24a as it moves towards the indoor side. This ensures ventilation in the corner ventilation passage R20 while restricting water from entering the corner ventilation passage R20 from the outside through the first communication hole 24a.

[0069] When wind flows from the outside towards the inside, the lower surface of the valve body 30 is subjected to wind pressure. This causes a force to act on the valve body 30 that rotates it in a direction that approaches the first communication hole 24a, that is, in a direction that closes the first communication hole 24a. In the case of a storm, the wind pressure is so large that the valve body 30 completely closes the first communication hole 24a, as shown by the dashed line in Figure 6. This further restricts the intrusion of rainwater into the corner ventilation passage R20 through the first communication hole 24a during a storm.

[0070] [Example of second change] As shown in Figure 7, the valve body 30 of the second modified example has a first plate 31 and a second plate 32 perpendicular to the first plate 31. The first plate 31 is provided with a through hole 31a. The intersection of the first plate 31 and the second plate 32 is rotatably attached via a hinge 33 to the portion of the first horizontal plate 24 that is located on the indoor side of the first communication hole 24a.

[0071] As shown in Figure 8, the outdoor-facing surface 25b of the first vertical plate 25 is provided with a guide portion 40 that guides air toward the valve body 30. The guide portion 40 is located in the gap G between the lower surface of the first horizontal plate 24 and the upper surface 14c of the exterior wall material 14 (see Figure 7).

[0072] The guide section 40 includes, for example, a first wall section 41 and two second wall sections 42. The first wall section 41 is positioned in the second direction D2 where the valve body 30 is provided. The first wall section 41 is aligned with the valve body 30 in the first direction D1. The first wall section 41 has two curved plates 41a. The two curved plates 41a are aligned in the second direction D2. The two curved plates 41a are curved so that as they approach each other, they move away from the outdoor side surface 25b of the first vertical plate section 25. The two second wall sections 42 are located on either side of the first wall section 41 in the second direction D2. Each second wall section 42 is curved so that as it approaches the first wall section 41, it moves closer to the outdoor side surface 25b of the first vertical plate section 25. A curved surface 40a that is recessed towards the interior is formed by one curved plate 41a, a first vertical plate portion 25, and one second wall portion 42.

[0073] Due to gravity acting on the valve body 30, a force acts on the valve body 30 that causes it to rotate in a direction that moves the second plate 32 away from the first communication hole 24a. As shown in Figure 7, in the absence of wind, the first plate 31 of the valve body 30 is located within the first communication hole 24a of the first horizontal plate portion 24. The first plate 31 is supported by a support portion (not shown) so that it is not located below the first horizontal plate portion 24. At this time, the second plate 32 of the valve body 30 is located below the first horizontal plate portion 24 and is perpendicular to the first horizontal plate portion 24. In this state, ventilation of the corner ventilation passage R20 is ensured by the through hole 31a of the first plate 31.

[0074] As shown in Figure 8, when wind flows from the outside to the inside, the wind flowing from the outside to the inside on both sides of the first communication hole 24a collides with the outdoor surface 25b of the first vertical plate 25 and is reflected. The indoor surface of the second plate 32 is subjected to the wind pressure of the reflected wind. As a result, a force acts on the valve body 30 that rotates the valve body 30 in the direction that the second plate 32 approaches the first communication hole 24a, that is, in the direction that closes the first communication hole 24a. When the force that rotates the valve body 30 due to wind pressure exceeds the force that rotates the valve body 30 due to gravity, the valve body 30 rotates in the direction that the second plate 32 approaches the first communication hole 24a.

[0075] As shown in Figure 9, in the event of a storm, the wind pressure is so high that the second plate 32 completely closes the first communication hole 24a of the first horizontal plate portion 24. This further restricts the intrusion of rainwater into the corner ventilation passage R20 through the first communication hole 24a during a storm.

[0076] As described above, a guide portion 40 is provided on the outdoor-facing surface 25b of the first vertical plate portion 25. Therefore, when wind collides with the outdoor-facing surface 25b of the first vertical plate portion 25 and turns back, it is guided toward the valve body 30 by the guide portion 40. Specifically, as shown by the arrows in Figure 8, the wind flowing from the outdoor side toward the indoor side on both sides of the first communication hole 24a flows along the curved surface 40a and is guided toward the valve body 30. This allows the valve body 30 to rotate efficiently.

[0077] In the second modified example, the guide section 40 may be omitted. In the above embodiment, the building 100 was a house, but it does not have to be a house. In the above embodiment, the exterior wall 10 was the exterior wall of the first floor and the overhang 11 was part of the second floor, but this is not limited to this. For example, if the building 100 is three stories tall, the exterior wall 10 may be the exterior wall of the second floor and the overhang 11 may be part of the third floor.

[0078] The overhanging portion 11 may be an eaves, and the lower surface member 13 may be an underside eaves member. <Note> This specification discloses the following technologies:

[0079] [Note 1] A ventilation structure for an inner corner where the outdoor side surface of an exterior wall intersects with the lower surface of an overhanging portion located above the exterior wall and extending outward from the exterior wall, wherein in the inner corner, the upper surface of the exterior wall material of the exterior wall is located below the lower surface of the lower surface member of the overhanging portion, and a trim material is provided in the inner corner, the trim material having a first member and a second member spaced apart from the first member and located more indoor than the first member, the lower surface member being sandwiched between the first member and the second member, the inner corner ventilation passage being partitioned by the first member and the second member, the first member having a first communication hole that connects the outside to the inner corner ventilation passage, and a restricting portion that restricts water from entering the inner corner ventilation passage from the outside through the first communication hole.

[0080] [Note 2] In the ventilation structure for the inner corner described in Appendix 1, the second member is provided with a second communication hole that connects the inner corner ventilation passage to the attic.

[0081] [Note 3] In the ventilation structure of the inner corner described in Appendix 1, an inner wall ventilation layer is provided on the indoor side of the outer wall material, the first member has a first horizontal plate portion arranged on the lower surface of the lower surface member and a first vertical plate portion extending downward from the indoor end of the first horizontal plate portion, the second member has a second horizontal plate portion arranged on the upper surface of the lower surface member and a second vertical plate portion extending downward from the indoor end of the second horizontal plate portion and located on the indoor side of the first vertical plate portion, the inner corner ventilation passage has a horizontal passage partitioned by the first horizontal plate portion and the second horizontal plate portion and a vertical passage partitioned by the first vertical plate portion and the second vertical plate portion, the vertical passage is connected to the inner wall ventilation layer.

[0082] [Note 4] In the ventilation structure of the inner corner described in Appendix 3, the first communication hole is provided in the first horizontal plate, and the first member is provided with a weir portion that protrudes upward from the portion of the first horizontal plate located on the indoor side of the first communication hole.

[0083] [Note 5] In the ventilation structure of the inner corner described in Appendix 3, when the direction in which the overhang extends outward from the outer wall is defined as the first direction and the direction perpendicular to the first direction is defined as the second direction, a plurality of base materials are arranged at intervals in the second direction, and the trim material has a spacer that is placed between the first vertical plate and the second vertical plate, and the spacer is placed at the position where the base material is provided in the second direction.

[0084] [Note 6] In the ventilation structure for the inner corner described in Appendix 5, the trim material is fixed to the base material by a fixing member that penetrates the first vertical plate, the spacer, and the second vertical plate, and the first vertical plate is provided with an insertion hole through which the fixing member is inserted, and the insertion hole is an elongated hole extending in the vertical direction.

[0085] [Note 7] In the ventilation structure of the inner corner described in Appendix 3, the first communication hole is provided in the first horizontal plate, and the restricting portion is composed of a valve body that operates to close the first communication hole by wind pressure.

[0086] [Note 8] In the ventilation structure for the inner corner described in Appendix 7, the valve body is rotatably mounted to the portion of the first horizontal plate located on the outdoor side of the first communication hole.

[0087] [Note 9] In the ventilation structure of the inner corner described in Appendix 7, the valve body is rotatably mounted to the portion of the first horizontal plate that is located on the indoor side of the first communication hole.

[0088] [Note 10] In the ventilation structure of the inner corner described in Appendix 9, the outer surface of the first vertical plate is provided with a guide portion that guides air toward the valve body.

[0089] [Note 11] A building having a ventilation structure in the inner corner as described in any one of the appendices 1 to 10. [Explanation of Symbols]

[0090] 10...Exterior wall, 10a...Outer side of the exterior wall, 11...Protruding section, 11a...Underside of the protruding section, 13...Bottom member, 13a...Bottom surface of the bottom member, 13b...Top surface of the bottom member, 14...Exterior wall material, 14c...Top surface of the exterior wall material, 16...Base column as base material, 17...Fixing member, 20...Trim material, 21...First member, 22...Second member, 23...Spacer, 24...First horizontal board section, 24a...First communication hole, 25 ...First vertical plate section, 25a...Through hole, 25b...Outdoor side of the first vertical plate section, 26...Second horizontal plate section, 26a...Second connecting hole, 27...Second vertical plate section, 28...Regulating section, 29...Weir section, 30...Valve body, 40...Guiding section, 100...Building, C...Inside corner section, R11...Ventilation layer inside the exterior wall, R12...Attic, R20...Inside corner ventilation passage, R20a...Horizontal passage, R20b...Vertical passage, D1...First direction, D2...Second direction.

Claims

1. A ventilation structure for an inner corner where the outer surface of an exterior wall intersects with the lower surface of an overhang that is located above the exterior wall and extends outward from the exterior wall, In the aforementioned corner, the upper surface of the exterior wall material of the exterior wall is located below the lower surface of the lower surface member of the protruding portion. The corner portion is equipped with a trim piece, The trim material comprises a first member and a second member positioned on the interior side of the first member, spaced apart from the first member. The lower member is sandwiched between the first member and the second member. The corner ventilation passage is partitioned by the first member and the second member. The ventilation structure for an inner corner is provided with a first member that has a first communication hole for connecting the outside and the inner corner ventilation passage, and a restricting part that restricts water from entering the inner corner ventilation passage from the outside through the first communication hole.

2. The ventilation structure for an inner corner according to claim 1, wherein the second member is provided with a second communication hole that connects the inner corner ventilation passage and the attic.

3. An internal ventilation layer is provided on the interior side of the aforementioned exterior wall material. The first member has a first horizontal plate portion positioned on the lower surface of the lower surface member, and a first vertical plate portion extending downward from the indoor-side end of the first horizontal plate portion. The second member has a second horizontal plate portion positioned on the upper surface of the lower member, and a second vertical plate portion extending downward from the indoor end of the second horizontal plate portion and located more indoors than the first vertical plate portion. The aforementioned corner ventilation passage has a horizontal passage partitioned by the first horizontal plate portion and the second horizontal plate portion, and a vertical passage partitioned by the first vertical plate portion and the second vertical plate portion. The ventilation structure for an inner corner according to claim 1, wherein the vertical passage is connected to the ventilation layer inside the outer wall.

4. The first communication hole is provided in the first horizontal plate portion, The ventilation structure for an inside corner according to claim 3, wherein the first member is provided with a weir portion that protrudes upward from a portion of the first horizontal plate portion that is located on the indoor side of the first communication hole.

5. When the direction in which the overhang extends from the outer wall is defined as the first direction, and the direction perpendicular to the first direction is defined as the second direction, Multiple base materials are arranged at intervals in the second direction, The trim piece has a spacer that is positioned between the first vertical plate portion and the second vertical plate portion. The ventilation structure for an inner corner according to claim 3, wherein the spacer is positioned in the second direction where the base material is provided.

6. The trim piece is fixed to the base material by a fixing member that penetrates the first vertical plate portion, the spacer, and the second vertical plate portion. The first vertical plate portion is provided with an insertion hole through which the fixing member is inserted. The ventilation structure for an inner corner according to claim 5, wherein the insertion hole is an elongated hole extending in the vertical direction.

7. The first communication hole is provided in the first horizontal plate portion, The ventilation structure for an inner corner according to claim 3, wherein the regulating portion is comprised of a valve body that operates to close the first communication hole by wind pressure.

8. The ventilation structure for an inside corner according to claim 7, wherein the valve body is rotatably mounted to a portion of the first horizontal plate portion located on the outdoor side of the first communication hole.

9. The ventilation structure for an inside corner according to claim 7, wherein the valve body is rotatably mounted to a portion of the first horizontal plate portion located on the indoor side of the first communication hole.

10. The ventilation structure for an inside corner according to claim 9, wherein the outdoor-facing surface of the first vertical plate is provided with a guide portion for guiding air toward the valve body.

11. A building having a ventilation structure for an inner corner according to any one of claims 1 to 10.

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