JP7469981B2 - Eaves structure - Google Patents

Description

This disclosure relates to eaves structures.

In buildings such as houses, there are eaves structures that have eaves that protrude from the upper part of the building body as an overhanging part. In such eaves structures, it is considered to provide a water return structure in the eaves to allow ventilation in the attic (see, for example, Patent Document 1).

JP 2015-132126 A

Here, when the above-mentioned eaves structure has a long overhang, if ventilation is performed from the tip of the eaves, there is a distance between the tip of the eaves and the living room, so in many cases no large-scale water return is required. However, when the above-mentioned eaves structure has a short overhang, the distance from the tip of the eaves to the living room is short, so a complex water return structure is required. However, when the above-mentioned eaves structure has a short overhang, there is a physical lack of space, making it difficult to efficiently arrange the water return structure.

This disclosure was made in consideration of the above circumstances, and aims to provide an eaves structure that allows for easy installation of a water return structure even in eaves with a short overhang.

In order to achieve the above-mentioned object, the eaves structure of the present disclosure comprises a building-side drain provided at the upper end of the building body and a roof-side drain provided near the end of the roof panel installed on the upper part of the building body, and when the roof panel is installed on the upper part of the building body, the roof-side drain and the building-side drain are arranged in parallel in the horizontal direction on the back side of the eaves gutter to form an eaves drain, and the eaves drain has an upper first ventilation slit provided on a vertical plane extending vertically on the back side of the eaves gutter at the roof-side drain and leading to the upper side of the eaves gutter, a lower first ventilation slit provided on the vertical plane and leading to the lower side of the eaves gutter, and a ventilation passage connecting the upper first ventilation slit and the lower first ventilation slit to the attic space, and the roof-side drain and the building-side drain are arranged in parallel at a distance to form at least a part of the ventilation passage.

Here, the ventilation passage has a first passage section extending downward from the upper first ventilation slit, a second passage section extending upward from the lower first ventilation slit, and a third passage section extending from a junction of the first passage section and the second passage section toward the attic space, and the second passage section can be formed between the roof side drain and the building side drain.

The eaves cutout may have a second ventilation slit in the first passage section that penetrates the roof-side cutout section in a different direction from the upper first ventilation slit, and the roof panel may have a wall-top ventilation door between the attic space and the third passage section, and the wall-top ventilation door may have a third ventilation slit that penetrates the wall-top ventilation door in a different direction from the second ventilation slit. Furthermore, the building-side cutout may have a lower end eaves portion that extends below the lower end of the roof-side cutout section when the eaves cutout is configured, and the roof-side cutout may be long enough to provide a gap between the lower end and the lower end eaves portion in the vertical direction.

The eaves structure of the present disclosure, configured in this way, can easily provide a water return structure even in eaves with a short overhang.

Here, the ventilation passage has a first passage section extending downward from the upper first ventilation slit, a second passage section extending upward from the lower first ventilation slit, and a third passage section extending from the junction of the first passage section and the second passage section toward the attic space, and if the second passage section is formed between the roof side drain and the building side drain, the force of wind and rain entering through both ventilation slits can be weakened, and the intrusion of wind and rain into the attic space can be effectively suppressed.

If the eaves drain has a second ventilation slit in the first passage section that penetrates the roof side drain section in a different direction from the upper first ventilation slit, and the roof panel has a wall-top ventilation door between the attic space and the third passage section, and the wall-top ventilation door has a third ventilation slit that penetrates the wall-top ventilation door in a different direction from the second ventilation slit, the force of wind and rain that enters through the upper first ventilation slit can be more effectively weakened, and the force of wind and rain that enters through both first ventilation slits and passes through the third passage section can be more effectively weakened, and the intrusion of wind and rain into the attic space can be effectively suppressed. When the building-side cut-off is configured with the eaves cut-off, a lower end eaves portion is provided that extends below the lower end of the roof-side cut-off, and the roof-side cut-off is long enough to provide a gap between the lower end and the lower end eaves portion in the vertical direction. This prevents the roof-side cut-off and the building-side cut-off from interfering with each other when installing roof panels on the building unit, and allows the eaves cut-off to be appropriately positioned to provide a water return structure.

FIG. 2 is a vertical cross-sectional view showing the eaves structure according to the present disclosure. 1A and 1B are explanatory diagrams showing the drainage section on the building side, where (a) is an oblique view and (b) is a cross-sectional view taken along line II. An explanatory diagram showing how to provide a building side drainage section to a building unit. 2 is an explanatory diagram showing the roof side drainage, where (a) shows a front view and (b) shows a cross-sectional view taken along line II-II. FIG. FIG. 3 is an explanatory diagram showing a wall-mounted ventilation door, where (a) shows a front view and (b) shows a cross-sectional view taken along line III-III. FIG. 13 is an explanatory diagram showing how a roof-side drain is provided on a roof panel. 4A and 4B are explanatory diagrams showing the manner in which each bracket is attached to the roof side drainage section, where (a) shows a front view and (b) shows a cross-sectional view taken along line IV-IV. 1 is an explanatory diagram showing how a roof panel having a roof-side drainage portion is attached to a building unit having a building-side drainage portion. FIG. 8 is an explanatory diagram showing a cross section similar to that of FIG. 1.

An example of an eaves structure according to the present disclosure is described below with reference to the drawings.

As Example 1 of the present disclosure, an eaves structure 20 with an eaves edge water drain 21 at the eaves 5 of a building 1 will be described with reference to Figures 1 to 9. The eaves structure 20 ventilates the attic space 22 (attic ventilation) by forming a water return structure at the eaves edge water drain 21, and in Example 1, the eaves structure 20 is provided on a building 1 such as a modular building.

The building 1 is a detached house, an apartment building, or the like, and a roof panel 3 is installed on the upper part of the building body 2 so as to protrude outward from the building body 2, forming eaves 4. The eaves 4 in this embodiment 1 have a short protrusion. In the building 1, an eaves structure 20 is applied to the eaves edge 5 formed by this short eaves 4. Hereinafter, the direction in which the eaves 4 (roof panel 3) protrudes as viewed from the building body 2 is also referred to as the eaves edge side.

Here, the building 1 may be of any structure as long as the roof panel 3 can be attached to the building body 2, but in Example 1, it is a unit building. A unit building is a building unit that is manufactured in advance in a factory and is transported to a construction site in a roughly rectangular parallelepiped shape, and assembled at the construction site, so that the building 1 can be constructed in a short period of time. Building units include those made of steel (steel units) and wood (wood-based units), but in Example 1, it is made of steel. As shown in FIG. 3, etc., the steel building unit has a unit frame of a box rigid frame structure in which the upper ends of four columns 6 are connected in a rectangular shape by four roof beams 7, and the lower ends of the four columns 6 are connected in a rectangular shape by four floor beams.

The building body 2 is composed of multiple building units. Figure 3 and other figures show the vicinity of the roof beam 7 of the building unit on the top floor of the building body 2. In this building body 2, the eaves structure 20 is applied to the eaves 5 near a pair of gable roof beams 7a of the roof beam 7. In the building body 2, as shown in Figure 1 and other figures, an exterior wall panel is attached as an exterior wall 8 to the outside of the gable roof beam 7a. The upper end of the exterior wall 8 is approximately the same height as the upper end of the gable roof beam 7a. In this gable roof beam 7a, multiple mounting holes 7c (see Figure 3) are provided at intervals in the longitudinal direction. In addition, in the building body 2 of Example 1, as shown in Figures 1 and 3, a connecting beam 11 is provided at least on the top floor. The connecting beam 11 has a U-shaped cross section and is provided between the two gable roof beams 7a, parallel to them, and across the two girder roof beams 7b.

As shown in Figs. 1 and 6, the roof panel 3 is installed on the top of the building unit on the top floor of the building body 2, and in Example 1, it has multiple parallel roof frames 12. The roof frame 12 is extended so as to span the pair of gable roof beams 7a. In the roof panel 3, a sheathing board 14, which serves as the roof surface material, is attached inside the roof frame 12 via a wooden batten 13 (sheathing board receiving wooden batten). The sheathing board 14 has a roofing material 15 on its upper surface. In the roof panel 3 of Example 1, multiple solar panels 17 are installed above the roofing material 15 via a base steel plate 16 or the like. Each solar panel 17 generates electricity using energy from sunlight and sends the obtained electricity to the building 1 or the like as appropriate. The roof frame 12 is covered from above with a cover member 18. The roof panel 3 configured in this way is fixed to the upper end of the girder roof beam 7b with a fixing device 19 such as a bolt and nut set (see Fig. 8) and installed on the top of the building body 2. The roof panel 3 may be any type that is installed on the top of the building body 2, and is not limited to the structure of Example 1.

As shown in FIG. 1 and other figures, when the roof panel 3 of Example 1 is installed on the building body 2, the roof frame 12, wooden battens 13, sheathing boards 14, etc. are horizontally long enough to reach the eaves side to the surface (exterior surface) of the exterior wall 8. In contrast, when the roof panel 3 is installed on the top of the building body 2, the base steel plate 16, cover member 18, etc. are long enough to extend slightly outward from the surface of the exterior wall 8. The amount of extension from the exterior wall 8 is approximately half the width of the eaves gutter 72 provided at the eaves 5, and rainwater from the roof panel 3 flows directly into the eaves gutter 72. As a result, the building 1 has a eaves 4 with a short extension.

Next, the configuration of the eaves structure 20 at the eaves 5 below the eaves 4 will be described. The eaves structure 20 provides an eaves cutout 21 that allows for attic ventilation at the eaves 5 of the building 1. This eaves cutout 21 includes a building-side cutout 30 and a roof-side cutout 40. The building-side cutout 30 protrudes from the exterior wall 8 of the building body 2 toward the eaves and is provided at the upper edge of the building body 2. The roof-side cutout 40 is provided at the end of the roof panel 3 on the eaves side below the eaves 4. When the roof panel 3 is installed on the top of the building body 2, the building-side cutout 30 and the roof-side cutout 40 are arranged in parallel horizontally on the back side of the eaves gutter 72 to form the eaves cutout 21.

As shown in FIG. 2, the building-side water cutout 30 is constructed by bending a long plate-like member, and from the top has a horizontal portion 31, an inclined portion 32, a vertical portion 33, and a lower end eaves portion 34. The horizontal portion 31 is a flat plate extending horizontally, and is the portion that is attached to the gable roof beam 7a of the building body 2. The horizontal portion 31 has multiple mounting holes 31a spaced apart in the longitudinal direction. Each mounting hole 31a is positioned to correspond to a mounting hole 7c in the gable roof beam 7a.

When attached to the gable roof beam 7a, the inclined portion 32 is a portion that protrudes from the gable roof beam 7a beyond the exterior wall 8 to the outside of the building body 2 (see FIG. 1, etc.), and is a flat plate that slopes downward as it extends outward. The vertical portion 33 is a flat plate that extends downward in a substantially vertical direction from the outer end of the inclined portion 32. The lower end eaves portion 34 is a flat plate that slopes downward as it extends outward from the lower end of the vertical portion 33. The lower end eaves portion 34 is reinforced by forming a hemming that is folded back 180° so that the lower end is partially doubled.

As shown in Figures 1 and 3, this building-side water cutout 30 is attached to the gable roof beam 7a together with a spacer 35. The spacer 35 is a rectangular plate member made of a metal material, and has a mounting hole 35a in approximately the center.

The building side cutout 30 is attached to the building body 2 as follows. First, in the building body 2 before the roof panel 3 is installed, the horizontal part 31 is placed on the gable roof beam 7a to place the roof side cutout 40, and each spacer 35 is placed so that the mounting holes 31a of the horizontal part 31 are aligned with the mounting holes 35a. Then, fasteners 36 such as bolt and nut sets are attached through the mounting holes 35a of each spacer 35, the mounting holes 31a of the building side cutout 30, and the mounting holes 7c of the gable roof beam 7a. In this way, the building side cutout 30 is attached to the gable roof beam 7a together with the spacer 35. At this time, in the building side cutout 30, sealing materials 37 are provided above and below the inclined portion 32. The sealing materials 37 are provided between the upper surface of the inclined portion 32 and the lower flange 63 of the wall-mounted ventilation door 60 described later, and between the lower surface of the inclined portion 32 and the exterior wall 8. This sealing material 37 is attached appropriately with an adhesive or glue, ensuring sealing of the building body 2 from the outside at the installed location.

As shown in FIG. 4, the roof-side drain 40 is made by bending a long plate-like member, and has a vertical portion 41, an outer horizontal portion 42, a folded portion 43, an inner horizontal portion 44, an attachment portion 45, and an eave portion 46.

The vertical portion 41 is a flat plate extending substantially vertically, and constitutes a vertical surface extending vertically in the roof-side drainage section 40 (see FIG. 1, etc.). When the roof panel 3 is installed on the building body 2, the lower side of this vertical portion 41 faces the vertical portion 33 of the building-side drainage section 30 at a predetermined distance in the horizontal direction. In addition, the vertical portion 41 is long enough to provide a gap between the lower end 41a and the lower end eaves portion 34 in the vertical direction when the roof panel 3 is installed on top of the building body 2.

The outer horizontal portion 42 is bent from the upper end of the vertical portion 41 toward the outside (eaves side) in a flat plate shape. The outer horizontal portion 42 faces the underside of the eaves 4 of the roof panel 3, and a waterproof sealant 47 is provided between the outer horizontal portion 42 and the eaves 4. The waterproof sealant 47 is provided in contact with the outer horizontal portion 42 and the eaves 4 to ensure waterproofing between them. This waterproof sealant 47 is appropriately attached to the outer horizontal portion 42 and the eaves 4 with an adhesive or glue. The folded portion 43 is bent from the outer end of the outer horizontal portion 42 toward the bottom in a flat plate shape. The folded portion 43 is reinforced by a hemming formed in the same way as the lower end eaves portion 34.

The inner horizontal portion 44 is provided in the vertical portion 41 at a position vertically spaced below the outer horizontal portion 42, and is formed as a flat plate bent from the vertical portion 41 toward the inside (toward the building 1). The mounting portion 45 is formed as a flat plate bent from the inner end of the inner horizontal portion 44 toward the upper side. The mounting portion 45 is assigned to the vertical portion 61 for mounting to the wall-mounted ventilation door 60 described below. The eaves portion 46 is provided in the vertical portion 41 at a position vertically spaced from the lower end 41a, and is formed as a flat plate that slopes downward as it moves outward from the vertical portion 41.

In this roof-side drainage section 40, an upper first ventilation slit 48, a lower first ventilation slit 49, and a second ventilation slit 51 are provided. The upper first ventilation slit 48 and the lower first ventilation slit 49 are provided by penetrating the vertical section 41 in the horizontal direction. The upper first ventilation slit 48 is provided at a position above the inner horizontal section 44 and below the outer horizontal section 42. The lower first ventilation slit 49 is provided at a position below the inner horizontal section 44 and above the eaves section 46. The second ventilation slit 51 is provided by penetrating the inner horizontal section 44 in the vertical direction.

The roof side drainage section 40 of the first embodiment is composed of a first plate member 40A and a second plate member 40B. The first plate member 40A is located on the outside of the roof side drainage section 40, and forms the folded portion 43, the outer horizontal portion 42, the vertical portion 41, and the eaves portion 46. The second plate member 40B is located on the inside of the roof side drainage section 40, and forms the mounting portion 45, the inner horizontal portion 44, and the vertical portion 41. The first plate member 40A and the second plate member 40B are overlapped with each other by fasteners such as rivets (not shown), and are integrated to form the roof side drainage section 40. In the roof side drainage section 40 of the first embodiment, the upper first ventilation slit 48 penetrates the first plate member 40A, the lower first ventilation slit 49 penetrates the first plate member 40A and the second plate member 40B, and the second ventilation slit 51 penetrates the second plate member 40B. In the roof-side drainage section 40 of Example 1, the portion cut out as the lower first ventilation slit 49 in the first plate member 40A is bent to form the eaves portion 46. Note that the roof-side drainage section 40 is not limited to the configuration of Example 1 as long as it has the above-mentioned portions (reference numerals 41 to 46) and slits (48, 49, 51).

As shown in Figures 1 and 5, the roof panel 3 has a wall-mounted ventilation door 60 at the boundary between the attic space 22 and the outside. The attic space 22 is a space formed within the roof panel 3 above the building body 2 when the roof panel 3 is attached to the building body 2. The wall-mounted ventilation door 60 is formed by bending a long plate-like member, and has a vertical portion 61, an upper flange 62, and a lower flange 63. The vertical portion 61 is a flat plate extending along a substantially vertical direction. The vertical portion 61 is disposed at the upper end of the exterior wall 8, forming the boundary between the attic space 22 and the outside. This vertical portion 61 is elongated in a direction perpendicular to the paper when viewed from the front of Figure 1, and joint members 64 are appropriately provided at both ends in the long direction.

The upper flange 62 extends outward from the upper end of the vertical portion 61. The upper flange 62 is attached to the underside of the roof panel 3, such as the base steel plate 16, outside the eaves side end of the sheathing board 14. The lower flange 63 extends inward from the lower end of the vertical portion 61. The lower flange 63 is attached to the inclined portion 32 of the building side water drainage portion 30 via the sealing material 37 as described above.

This wall-mounted ventilation door 60 is provided with a third ventilation slit 65 and an overhanging portion 66. The third ventilation slit 65 is provided below the vertical center of the vertical portion 61, penetrating the vertical portion 61 in the horizontal direction. Therefore, the third ventilation slit 65 is the portion of the wall-mounted ventilation door 60 that connects the attic space 22 to the outside. The overhanging portion 66 is provided above the third ventilation slit 65, and is a flat plate that slopes downward from the vertical portion 61 toward the outside, and then slopes downward along an approximately vertical direction.

As shown in FIG. 1, the roof panel 3 is provided with an eaves water drain bracket 67 for mounting the wall-mounted ventilation door 60 and the roof-side water drain 40. The eaves water drain bracket 67 is attached to the tip of the wooden batten 13 on the back side of the wall-mounted ventilation door 60. The wall-mounted ventilation door 60 is fixed to the roof panel 3 by fitting a fastener 68 such as a screw into the eaves water drain bracket 67 from the outside through the vertical part 61. As shown in FIG. 1 and FIG. 6, the roof-side water drain 40 is fixed to the roof panel 3 by fitting a fastener 69 such as a screw into the eaves water drain bracket 67 from the outside through the mounting part 45 and the vertical part 61 with the mounting part 45 facing the vertical part 61 of the wall-mounted ventilation door 60. As a result, the roof-side water drain 40 is attached to the roof panel 3 on the outside of the wall-mounted ventilation door 60.

As shown in Figures 1 and 7, a bracket 71 (eaves gutter support bracket) is attached to this roof-side drain 40. The bracket 71 is a member for providing an eaves gutter 72 at the eaves end 5, and has an outer support part 71a, an inner support part 71b, and an attachment part 71c. Multiple brackets 71 are provided at required intervals in the direction in which the roof-side drain 40 extends. Each bracket 71 is provided at a predetermined position on the roof-side drain 40 by screwing a fastener 73 such as a screw into the vertical part 41 of the roof-side drain 40 through the attachment part 71c.

The eaves gutter 72 is a gutter provided at the eaves edge 5, and is provided along the direction in which the roof-side drainage section 40 extends. The eaves gutter 72 has a bottom surface 72a, an outer rising portion 72b, and an inner rising portion 72c, and has a cross section perpendicular to the direction of extension that is approximately U-shaped. The eaves gutter 72 is attached to the roof-side drainage section 40 via each bracket 71 by fitting the vicinity of the upper edge of the outer rising portion 72b into the outer support portion 71a of each bracket 71, and fitting the vicinity of the upper edge of the inner rising portion 72c into the inner support portion 71b of each bracket 71. Then, the roof-side drainage section 40 is positioned so that it is hidden behind (on the back side of) the inner rising portion 72c of the eaves gutter 72.

Next, the installation of the eaves edge drain 21 will be described. First, the building side drain 30 and the roof side drain 40 are attached to the building body 2 or the roof panel 3, respectively, at the factory before the roof panel 3 is installed on the building body 2 on the top floor. As described above, the building side drain 30 is attached to both end roof beams 7a of the building body 2 using the fixing devices 36 together with the spacers 35 (see Figure 3). Also, as described above, the roof side drain 40 is attached to the roof panel 3 via the wall-mounted ventilation door 60 by fitting the fixing devices 69 into the eaves edge drain receiving fittings 67 (see Figure 6). In the roof panel 3, the eaves gutter 72 is attached to the roof side drain 40 via the brackets 71 (see Figure 1) as described above.

The building body 2 is set up at the construction site in the same manner as in the past. Then, at the construction site, the roof panel 3 is suspended by the suspension mechanism 74 with both roof beams 7b supported by multiple clips 74a, as shown in Figures 8 and 9, and placed above the building body 2. The roof panel 3 is then lowered onto the building body 2 by the suspension mechanism 74 and fixed to the upper ends of both roof beams 7b by fasteners 19, thereby being installed on top of the building body 2.

As shown in FIG. 1, at the eaves edge 5, the eaves gutter 72 and the roof-side water cutout 40 are lined up horizontally from the eaves edge side, and the building-side water cutout 30 and the wall-mounted ventilation door 60 are lined up vertically inside them. At this time, the vertical part 41 of the roof-side water cutout 40 is long enough to provide a gap between the lower end 41a and the lower end eaves part 34 of the building-side water cutout 30 in the vertical direction, so that the roof-side water cutout 40 and the building-side water cutout 30 are prevented from interfering with each other when the roof panel 3 is installed on the building body 2. The roof-side water cutout 40 and the building-side water cutout 30 form the eaves edge water cutout 21 on the back side of the eaves gutter 72 by lining up the vertical part 41 and the vertical part 33 horizontally at a predetermined interval, and together with the wall-mounted ventilation door 60, form the eaves edge structure 20.

This eaves edge drain 21 forms a ventilation passage 80 that connects the upper first ventilation slit 48 and the lower first ventilation slit 49 provided in the roof side drain 40 to the attic space 22 inside the roof panel 3. This ventilation passage 80 has a first passage section 81, a second passage section 82, and a third passage section 83.

The first passage 81 extends downward from the upper first ventilation slit 48 of the vertical part 41 between the vertical part 41 of the roof side cut-off part 40 and the vertical part 61 and eaves part 66 of the wall-mounted ventilation panel 60. The upper first ventilation slit 48 is located at the top of the vertical part 41 on the back side of the eaves gutter 72 and leads to the upper side of the eaves gutter 72. The first passage 81 passes through the second ventilation slit 51 that vertically penetrates the inner horizontal part 44 of the roof side cut-off part 40.

The second passage 82 extends upward from the lower first ventilation slit 49 of the vertical part 41 between the vertical part 41 of the roof side drainage part 40 and the vertical part 33 of the building side drainage part 30. The lower first ventilation slit 49 is located at the bottom of the vertical part 41 on the back side of the eaves gutter 72 and leads to the underside of the eaves gutter 72.

The third passage 83 extends from the junction of the first passage 81 and the second passage 82 toward the attic space 22. The third passage 83 is connected to the third ventilation slit 65 of the wall-mounted ventilation door 60 between the eaves portion 66 of the wall-mounted ventilation door 60 and the inclined portion 32 of the building-side water cutout 30. This third passage 83 is connected to the attic space 22 through the third ventilation slit 65.

In this way, the eaves structure 20 can provide the eaves cutout 21 at the eaves 5 by installing the roof panel 3 with the roof cutout 40 attached to the building main body 2 with the building side cutout 30 attached. The building side cutout 30 and the roof side cutout 40 can be attached to the building main body 2 and the roof panel 3 in advance at the factory, making the installation work simple. Therefore, even for the eaves 5 of the eaves 4 with a short overhang, the eaves structure 20 can place the eaves cutout 21 on the back side of the eaves gutter 72 without requiring complex work at the construction site and by simplifying the installation work at the factory.

This eaves structure 20 forms a gap for ventilation with the eaves water cutout 21 at the rear side (building 1 side) of the eaves gutter 72, and the eaves water cutout 21 can basically block wind and rain. The eaves water cutout 21 ventilates through the upper first ventilation slit 48 and the lower first ventilation slit 49 provided in the part covered by the rear side of the eaves gutter 72, so even with a short overhang of the eaves 4, ventilation performance can be ensured and water can be returned efficiently. In addition, the eaves water cutout 21 has the upper first ventilation slit 48 that leads to the upper side of the eaves gutter 72 and the lower first ventilation slit 49 that leads to the lower side of the eaves gutter 72, so wind and rain that enters from one side can be discharged from the other side.

In the eaves structure 20, the first passage section 81 extends downward from the upper first ventilation slit 48, and a second ventilation slit 51 is provided midway along the first passage section 81, which faces in a different direction from the upper first ventilation slit 48. Therefore, the eaves structure 20 can weaken the force of wind and rain that has entered the first passage section 81 from the upper first ventilation slit 48. In addition, in the eaves structure 20, the second passage section 82 extends upward from the lower first ventilation slit 49. Therefore, the eaves structure 20 can weaken the force of wind and rain that has entered the second passage section 82 from the lower first ventilation slit 49.

In the eaves structure 20, the third passage section 83 extends from the junction of the first passage section 81 and the second passage section 82 toward the building 1 side, and is connected to the attic space 22 through the third ventilation slit 65 of the wall-mounted ventilation door 60. Therefore, the eaves structure 20 can further weaken the force of wind and rain that has passed through the first passage section 81 and the second passage section 82, and the wall-mounted ventilation door 60 can block the intrusion of wind and rain into the attic space 22. In addition, since the eaves structure 20 has a eaves portion 66 on the wall-mounted ventilation door 60, it can more effectively suppress the intrusion of wind and rain, especially rain, into the third ventilation slit 65. For these reasons, the eaves structure 20 can easily provide a more effective water return structure.

The eaves structure 20 has the building side water cut 30 attached to the gable roof beam 7a together with the spacer 35. Therefore, in the building side water cut 30, when snow (including ice) that has entered the second passage section 82 and the third passage section 83 adheres to the inclined section 32, the vertical section 33, and the lower end eaves section 34, the snow load can be transmitted to the gable roof beam 7a through the entire surface of the spacer 35. As a result, the eaves structure 20 can appropriately release the load even if snow adheres to the building side water cut 30. In addition, in the building 1, the building body 2 has a connecting beam 11 that spans both girder roof beams 7b, so that even if a wind load is generated on the eaves water cut 21, especially the building side water cut 30, the connecting beam 11 suppresses the distortion of the rectangular connection state of the four roof beams 7. In other words, in the building 1, the wind load received by the eaves water cut 21, especially the building side water cut 30, can be borne by the connecting beam 11.

The eaves structure of Example 1 of the present disclosure can achieve the following effects:

When the roof panel 3 is installed on the top of the building body 2, the eaves structure 20 has the roof side drain 40 and the building side drain 30 aligned horizontally on the back side of the eaves gutter 72 to form the eaves drain 21, which has an upper first ventilation slit 48, a lower first ventilation slit 49, and a ventilation passage 80. Therefore, even in the eaves 5 of the eaves 4 with a short overhang, the eaves structure 20 can easily arrange the eaves drain 21 on the back side of the eaves gutter 72 to provide a water return structure.

The eaves structure 20 forms at least a part of the ventilation passage 80 between the roof side drainage section 40 and the building side drainage section 30, which are arranged in parallel with a gap between them. Therefore, the eaves structure 20 can form the ventilation passage 80 by utilizing the positional relationship between the building side drainage section 30 and the roof side drainage section 40, which are provided separately, and can easily provide an effective water return structure.

The eaves structure 20 has a ventilation passage 80 having a first passage section 81, a second passage section 82, and a third passage section 83, and the second passage section 82 is formed between the roof side drain section 40 and the building side drain section 30. Therefore, the eaves structure 20 can weaken the force of wind and rain that enters through both first ventilation slits (48, 49), and can effectively suppress the intrusion of wind and rain into the attic space 22.

The eaves structure 20 has a second ventilation slit 51 in the first passage section 81 of the eaves drain 21. Therefore, the eaves structure 20 can more effectively weaken the force of wind and rain that has entered through the upper first ventilation slit 48, and can effectively suppress the intrusion of wind and rain into the attic space 22.

The eaves structure 20 has a wall-mounted ventilation door 60 on the roof panel 3, which is provided with a third ventilation slit 65. Therefore, the eaves structure 20 can more effectively weaken the force of wind and rain that enters through both first ventilation slits (48, 49) and passes through the third passage section 83, and can effectively suppress the intrusion of wind and rain into the attic space 22.

The eaves structure 20 has a canopy portion 66 above the third ventilation slit 65 in the wall-mounted ventilation panel 60. Therefore, the eaves structure 20 can more effectively prevent wind and rain, especially rain, from entering the third ventilation slit 65, and can effectively prevent wind and rain from entering the attic space 22.

When the eaves edge structure 20 has the eaves edge water cutout 21 configured, the roof side water cutout 40 is long enough to provide a gap between the lower end 41a and the lower end eaves portion 34 in the vertical direction. Therefore, when the roof panel 3 is installed on the building body 2, the eaves edge structure 20 can prevent the roof side water cutout 40 and the building side water cutout 30 from interfering with each other, and the eaves edge water cutout 21 can be appropriately positioned to form a water return structure.

The eaves structure 20 has the roof side water cutout 40 attached to the end roof beam 7a of the building body 2 together with the spacer 35. Therefore, even if snow adheres to the building side water cutout 30, the eaves structure 20 can transmit the load to the end roof beam 7a and release it.

Therefore, with the eaves structure 20 disclosed herein, a water return structure can be easily provided even in eaves 4 with a short projection.

The eaves structure of this disclosure has been described above based on Example 1, but the specific configuration is not limited to Example 1, and design changes and additions are permitted as long as they do not deviate from the gist of the invention as claimed in each claim of the patent.

For example, in Example 1, the vertical portion 41 in the roof-side drainage section 40, which is provided with the upper first ventilation slit 48 and the lower first ventilation slit 49, extends vertically, but does not have to extend vertically in the strict sense, and is not limited to the configuration of Example 1.

In addition, in Example 1, the second ventilation slit 51 penetrates the inner horizontal portion 44 that extends horizontally in the roof side drainage section 40, but it is sufficient that it penetrates the roof side drainage section 40 in a direction different from the upper first ventilation slit 48, and is not limited to the configuration of Example 1.

In addition, in Example 1, the third ventilation slit 65 penetrates the vertical portion 61 that extends vertically in the wall-mounted ventilation door 60, but it is sufficient if it penetrates the wall-mounted ventilation door 60 in a direction different from that of the second ventilation slit 51, and is not limited to the configuration of Example 1.

Reference Signs List 2 Building body 3 Roof panel 20 Eaves structure 21 Eaves drain 22 Attic space 30 Building side drain 34 Lower end eaves portion 35 Spacer 40 Roof side drain 41 Vertical portion (as a vertical surface) 41a Lower end 48 Upper first ventilation slit 49 Lower first ventilation slit 51 Second ventilation slit 60 Wall-top ventilation door 65 Third ventilation slit 66 Eaves portion 72 Eaves gutter 80 Ventilation passage 81 First passage portion 82 Second passage portion 83 Third passage portion

Claims (4)

A building side water drain provided at the upper end of the building body;
A roof side water drain provided near an end of the roof panel installed on the upper part of the building body,
When the roof panel is installed on the upper part of the building body, the roof side water cut-off portion and the building side water cut-off portion are arranged in parallel in the horizontal direction on the back side of the eaves gutter to form an eaves water cut-off,
The eaves edge drain has an upper first ventilation slit provided on a vertical plane extending vertically on the back side of the eaves gutter in the roof side drain and leading to the upper side of the eaves gutter, a lower first ventilation slit provided on the vertical plane and leading to the lower side of the eaves gutter, and a ventilation passage connecting the upper first ventilation slit and the lower first ventilation slit to an attic space,
An eaves structure characterized in that the roof side drain and the building side drain are arranged in parallel with a gap between them and form at least a part of the ventilation passage. The ventilation passage has a first passage portion extending downward from the upper first ventilation slit, a second passage portion extending upward from the lower first ventilation slit, and a third passage portion extending from a joining point of the first passage portion and the second passage portion toward the attic space,
The eaves structure according to claim 1, characterized in that the second passage portion is formed between the roof side water cut-off portion and the building side water cut-off portion. The eaves edge water cut has a second ventilation slit penetrating the roof side water cut portion in a direction different from the upper first ventilation slit in the first passage portion,
In the roof panel, a wall-mounted ventilation door is provided between the attic space and the third passage portion,
The eaves structure described in claim 2, characterized in that the wall-mounted ventilation door has a third ventilation slit that penetrates the wall-mounted ventilation door in a direction different from the second ventilation slit. In the building side cut-off portion, when the eaves cut-off portion is configured, a lower end eaves portion is provided that extends to the lower side of the lower end of the roof side cut-off portion,
The eaves structure according to any one of claims 1 to 3, characterized in that the roof side drainage portion is of a length sufficient to provide a gap between the lower end and the lower end eave portion in the vertical direction.