Roof structure

Abstract

To provide a roof structure provided with a configuration allowing heat bridge to be hardly produced by climbing beams and rafters.SOLUTION: A roof structure having a slope roof surface includes: climbing beams; rafters; rafter support members supported on the climbing beams as well as supporting the rafters; and roofing boards supported by the rafters, wherein the climbing beams and the rafters are arranged not to be overlapped in a vertical direction at any position in an in-plane direction of the slope roof surface.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a roof structure.

Background Art

[0002] Conventionally, a roof structure including climbing beams has been known. Patent Document 1 describes this type of roof structure. The roof structure described in Patent Document 1 includes a ridge beam that is the topmost beam of the roof, an eaves beam that is provided in parallel with the ridge beam and along the outer wall of the building, and a main roof that is provided in parallel with these between the ridge beam and the eaves beam. Further, the roof structure described in Patent Document 1 includes a plurality of climbing beams fixed so as to be orthogonal to the ridge beam, the main roof, and the eaves beam, a receiving member fixed in contact with and on these plurality of climbing beams so as to be orthogonal to them, and a plurality of vertical beams fixed in contact with and on them so as to be orthogonal to the ridge beam, the main roof, the receiving member, and the eaves beam.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the roof structure described in Patent Document 1, since the vertical beams are arranged so as to overlap the climbing beams in the vertical direction, heat easily moves through the climbing beams and the vertical beams at the overlapping portion in the vertical direction. That is, there is a problem that the overlapping portion of the climbing beams and the vertical beams in the vertical direction is likely to become a thermal bridge.

[0005] An object of the present invention is to provide a roof structure having a configuration in which a thermal bridge formed by climbing beams and vertical beams is difficult to be formed.

Means for Solving the Problems

[0006] The roof structure according to the first aspect of the present invention is (1) A roof structure having a sloped roof surface, a climbing beam, a purlin, a purlin support member supported by the climbing beam and supporting the purlin, and a sheathing board supported by the purlin, characterized in that the climbing beam and the purlin are arranged so as not to overlap in the vertical direction at any position in the in-plane direction of the sloped roof surface.

[0007] A roof structure according to one embodiment of the present invention is (2) The purlin support member is a main roof member extending in a direction intersecting the extending directions of the climbing beam and the purlin, according to the roof structure described in (1) above.

[0008] A roof structure according to one embodiment of the present invention is (3) The main roof member is spanned between two parallel climbing beams such that its upper surface is flush with the upper surfaces of the two climbing beams, according to the roof structure described in (2) above.

[0009] A roof structure according to one embodiment of the present invention is (4) The roof structure according to (2) or (3) above includes a facing member extending in the in-plane direction so as to partition between the climbing beam, the main roof member, and the purlin.

[0010] A roof structure according to one embodiment of the present invention is (5) The purlin support member is a structural facing member extending in the in-plane direction so as to partition between the climbing beam and the purlin, according to the roof structure described in (1) above.

[0011] A roof structure according to one embodiment of the present invention is (6) The roof structure according to any one of (1) to (5) above, comprising a heat insulating material disposed at least between a plurality of the climbing beams arranged in parallel and between a plurality of the vertical timbers arranged in parallel.

Advantages of the Invention

[0012] According to the present invention, it is possible to provide a roof structure having a configuration in which it is difficult to form a thermal bridge due to climbing beams and vertical timbers.

Brief Description of the Drawings

[0013]

Figure 1

Figure 2

Figure 3

Embodiments for Carrying Out the Invention

[0014] Hereinafter, embodiments of the roof structure according to the present invention will be exemplarily described with reference to the drawings. The same components are denoted by the same reference numerals in each figure.

[0015] FIG. 1 is a view showing a building 200 including a roof structure 100 as an embodiment of the roof structure according to the present invention. The configuration of the building 200 is not particularly limited as long as the roof structure according to the present invention can be applied. The building 200 in the present embodiment is a two-family detached house having a column-beam structure. The building 200 in the present embodiment is made of wood and includes column members and beam members made of wood, but is not limited to this configuration. The building 200 may be, for example, a steel frame structure, a reinforced concrete structure, or the like.

[0016] The building 200 of this embodiment includes a reinforced concrete foundation 200a and a superstructure 200b fixed to the foundation, which has a frame structure composed of frame members such as column members and beam members. The superstructure 200b of this embodiment has a wooden frame structure as described above.

[0017] Specifically, an outer wall 201 including an exterior material or the like is arranged on the outer peripheral portion of the frame structure of the superstructure 200b of the building 200 of this embodiment. Also, a floor portion 202 including a floor slab or the like is arranged at the inter-story portion of the frame structure. Further, a roof 203 including an exterior roof material or the like is arranged on the upper portion of the frame structure.

[0018] The outer wall 201 of the building 200 of this embodiment includes an external finishing layer formed of an exterior material. Also, the outer wall 201 of the building 200 of this embodiment includes, for example, an internal finishing layer composed of a plasterboard and a finishing material such as wall cloth pasted on the surface of the plasterboard. Further, the outer wall 201 of the building 200 of this embodiment includes a heat insulating material such as glass wool, rock wool, or a foamed resin panel between the external finishing layer and the internal finishing layer. However, the outer wall 201 of the building 200 is not limited to this configuration.

[0019] The floor portion 202 of the building 200 of this embodiment includes a floor slab. The floor slab is laid on a plurality of beam members of the frame structure and is directly or indirectly supported by the plurality of beam members. As the floor slab, for example, a lightweight autoclaved aerated concrete (ALC) panel, a folded plate, an extruded cement board, a wooden panel material, or the like may be used. The floor portion 202 may include, in addition to the floor slab, for example, a ceiling interior material that constitutes the ceiling surface of the lower floor and is directly or indirectly attached to the floor slab, and a floor interior material such as flooring that constitutes the floor surface of the upper floor and is laminated on the floor slab.

[0020] Note that the roof 203 of this embodiment is composed of a pitched roof provided with an exterior roof material such as a galvanized steel sheet (registered trademark). A waterproof layer is formed on the roof 203 by, for example, a waterproof sheet formed of a vinyl chloride resin, and waterproof treatment is performed.

[0021] Hereinafter, with reference to FIGS. 2 and 3, the details of the roof structure 100 applied to the roof 203 will be described. FIG. 2 is a cross-sectional view of the roof 203. FIG. 2 is a cross-sectional view of the roof 203 taken along the extending direction of the climbing beam 1 and the purlin 2 described later. FIG. 3 is a cross-sectional view of the roof 203 at the position of line I-I in FIG. 2. FIG. 3 is a cross-sectional view of the roof 203 taken along a cross-section substantially orthogonal to the extending direction of the climbing beam 1 and the purlin 2 described later.

[0022] As shown in FIGS. 2 and 3, the roof structure 100 of the present embodiment includes a climbing beam 1, a purlin 2, a purlin support member 3, a facing material 4, a sheathing board 5, a heat insulating material 6, a waterproof sheet 7, an exterior roof material 8, and an interior roof material 9.

[0023] The climbing beam 1 extends along the roof inclination direction A of the pitched roof surface 203a of the roof 203. The roof inclination direction A of the pitched roof surface 203a means both the direction from the upper water side to the lower water side and the direction from the lower water side to the upper water side among the in-plane directions C of the pitched roof surface 203a. The climbing beam 1 is spanned and supported by the frame members of the building 200. The climbing beam 1 of the present embodiment is spanned between the ridge beam 10 and the eaves beam 11 as the beam members of the frame members and is supported by the ridge beam 10 and the eaves beam 11. However, the climbing beam 1 may be spanned and supported by the column members of the frame members of the building 200 or beam members other than the ridge beam 10 and the eaves beam 11.

[0024] In addition, a plurality of climbing beams 1 are arranged in parallel at intervals in the roof horizontal direction B of the pitched roof surface 203a. The roof horizontal direction B of the pitched roof surface 203a means the direction substantially orthogonal to the roof inclination direction A among the in-plane directions C of the pitched roof surface 203a.

[0025] The purlin 2 extends in the roof inclination direction A of the pitched roof surface 203a substantially parallel to the climbing beam 1. That is, the roof inclination direction A of the present embodiment is the extending direction of the climbing beam 1 and the purlin 2. The purlin 2 is supported by the purlin support member 3 described later.

[0026] Further, similar to the climbing beams 1, a plurality of purlins 2 are arranged in parallel at intervals in the roof horizontal direction B of the pitched roof surface 203a.

[0027] The purlin support member 3 is supported by the climbing beam 1. The purlin support member 3 of the present embodiment is the main roof member 21 extending in a direction intersecting the roof inclination direction A, which is the extending direction of the climbing beam 1 and the purlin 2. More specifically, the main roof member 21 as the purlin support member 3 of the present embodiment extends along the roof horizontal direction B of the pitched roof surface 203a. In other words, the roof horizontal direction B of the present embodiment is the extending direction of the main roof member 21 as the purlin support member 3. In the present embodiment, although the main roof member 21 as the purlin support member 3 extends in the roof horizontal direction B, which is the direction intersecting the roof inclination direction A, which is the extending direction of the climbing beam 1, it does not necessarily actually intersect the climbing beam 1. As will be described in detail later, the main roof member 21 may be spanned between two adjacent climbing beams 1 in a manner that the climbing beam 1 wins without actually intersecting the climbing beam 1 as in the present embodiment.

[0028] The main roof member 21 of the present embodiment is spanned between two adjacent climbing beams 1 in the roof horizontal direction B. More specifically, the main roof member 21 of the present embodiment is disposed sandwiched between these two adjacent climbing beams 1 and is attached to the side surfaces of these two adjacent climbing beams 1 facing each other, so as to be supported by these two climbing beams 1.

[0029] Further, a plurality of main roof members 21 of the present embodiment are arranged at intervals in the roof inclination direction A between two adjacent climbing beams 1 in the roof horizontal direction B. Therefore, in the roof structure 100 of the present embodiment, a rectangular opening 30 is formed by two adjacent climbing beams 1 in the roof horizontal direction B and two adjacent main roof members 21 in the roof inclination direction A.

[0030] The climbing beam 1 and the ceiling joist 21 of this embodiment are square bars with a rectangular outer shape in cross-section. And the climbing beam 1 and the ceiling joist 21 of this embodiment are attached so that the upper surfaces in the vertical upward direction of the climbing beam 1 and the ceiling joist 21 form a flat surface substantially parallel to the in-plane direction C of the sloped roof surface 203a. In other words, the ceiling joist 21 of this embodiment is spanned between two parallel climbing beams 1 so that the upper surface is flush with the upper surfaces of these two climbing beams 1.

[0031] The rafter support member 3 supports the rafter 2. Although details will be described later, the ceiling joist 21 as the rafter support member 3 of this embodiment indirectly supports the rafter 2 via the facing material 4.

[0032] The facing material 4 extends in the in-plane direction C of the sloped roof surface 203a so as to partition between the climbing beam 1 and the ceiling joist 21 and the rafter 2. In other words, the facing material 4 of this embodiment is laid on the flat facing material support surface formed by the upper surfaces of the climbing beam 1 and the ceiling joist 21. In this state, the facing material 4 is fastened to at least one of the climbing beam 1 and the ceiling joist 21 by a fastening member such as a screw. And the rafter 2 is disposed on the ceiling joist 21 via the laid facing material 4. More specifically, the rafter 2 is disposed so as to be spanned over a plurality of ceiling joists 21 spaced apart in the roof slope direction A via the laid facing material 4. The rafter 2 arranged in this way is fastened to the ceiling joist 21 by a fastening member such as a screw. The facing material 4 may be, for example, a wooden plywood or the like. By arranging such a facing material 4, the opening 30 formed by the climbing beam 1 and the ceiling joist 21 can be covered from vertically above. Thereby, the airtightness of the roof 203 of the building 200 can be enhanced.

[0033] As described above, the purlin 2 of the present embodiment is supported by the ceiling material 21 as the purlin support member 3. More specifically, the purlin 2 of the present embodiment is indirectly supported by the ceiling material 21 via the facing material 4. However, the purlin 2 may be configured to be directly supported by the purlin support member 3. That is, the roof structure 100 may be configured without the facing material 4, and the purlin 2 may be directly supported by the ceiling material 21 as the purlin support member 3.

[0034] The floor boarding 5 is disposed on the floor boarding support surface formed by the upper surfaces of a plurality of purlins 2 arranged at intervals in the roof horizontal direction B. That is, the floor boarding 5 is supported by the purlins 2. The floor boarding 5 is fastened to the purlins 2 by fastening members such as screws, for example. The floor boarding 5 may be, for example, a wooden plywood or the like.

[0035] The heat insulating material 6 is disposed between both of the plurality of climbing beams 1 arranged in parallel and between the plurality of purlins 2 arranged in parallel. More specifically, the heat insulating material 6 of the present embodiment includes a first heat insulating material 6a disposed between the plurality of climbing beams 1 arranged in parallel at intervals in the roof horizontal direction B. The first heat insulating material 6a of the present embodiment is disposed in the opening 30 formed by the climbing beam 1 and the ceiling material 21. Further, the heat insulating material 6 of the present embodiment includes a second heat insulating material 6b disposed between the plurality of purlins 2 arranged in parallel at intervals in the roof horizontal direction B. The second heat insulating material 6b of the present embodiment is disposed in the opening 31 formed between two adjacent purlins 2 in the roof horizontal direction B.

[0036] In the roof structure 100 of the present embodiment, it includes both the first heat insulating material 6a disposed in the opening 30 and the second heat insulating material 6b disposed in the opening 31, but it is not limited to this configuration. The roof structure 100 may be configured to include the heat insulating material 6 disposed only in either one of the opening 30 and the opening 31. Also, the roof structure 100 may be configured such that the heat insulating material 6 is not disposed in both the opening 30 and the opening 31. However, from the viewpoint of improving the heat insulation performance of the building 200, it is preferable that the heat insulating material 6 is disposed in at least one of the opening 30 and the opening 31, and more preferably, as in the present embodiment, the heat insulating material 6 is disposed in both the opening 30 and the opening 31.

[0037] The heat insulating material 6 may be a heat insulating material without formability such as glass wool or rock wool, or may be a heat insulating material with formability such as a foamed resin panel as in the present embodiment.

[0038] The waterproof sheet 7 is laid on the upper surface of the field board 5. The waterproof sheet 7 is fastened to the field board 5 by fastening members such as screws. The constituent material of the waterproof sheet 7 is not particularly limited, and may be, for example, asphalt roofing.

[0039] The exterior roof material 8 is laid on the upper surface of the waterproof sheet 7. The exterior roof material 8 is fastened to the field board 5, which is the base material, by fastening members such as screws. The exterior roof material 8 is not particularly limited, and may be, for example, a galvanized steel sheet, slate, or the like.

[0040] The interior roof material 9 is attached along the vertically downward surface of the climbing beam 1. The interior roof material 9 may be composed of, for example, an interior base material 9a attached to the climbing beam 1 and an interior finishing material 9b attached to the interior base material 9a.

[0041] Here, as shown in FIG. 3, in the roof structure 100, the climbing beams 1 and the purlins 2 are arranged so as not to overlap in the vertical direction at any position in the in-plane direction C of the sloped roof surface 203a. More specifically, the climbing beams 1 and the purlins 2 are arranged at different positions in the roof horizontal direction B so as not to overlap with each other in the vertical direction. By arranging the climbing beams 1 and the purlins 2 in this way, it is possible to prevent the climbing beams 1 and the purlins 2 from becoming a thermal bridge connected in the vertical direction due to overlapping in the vertical direction. Whether the climbing beams 1 and the purlins 2 are made of steel or wood, the climbing beams 1 and the purlins 2 have a higher thermal conductivity than the surrounding heat insulating material 6. Also, even when there is a gap around the climbing beams 1 and the purlins 2 without the heat insulating material 6 being arranged, the climbing beams 1 and the purlins 2 have a higher thermal conductivity than the gap. Therefore, by arranging the climbing beams 1 and the purlins 2 so as not to overlap in the vertical direction, regardless of the material of the climbing beams 1 and the purlins 2 and regardless of the presence or absence of the heat insulating material 6 around the climbing beams 1 and the purlins 2, it is possible to prevent the climbing beams 1 and the purlins 2 from becoming a thermal bridge connected in the vertical direction.

[0042] Note that, as shown in FIG. 3, although the climbing beams 1 and the purlins 2 are arranged at different positions in the roof horizontal direction B, they are still connected via the facing material 4. However, compared with the configuration in which the climbing beams 1 and the purlins 2 overlap in the vertical direction, the presence of the facing material 4 between the climbing beams 1 and the purlins 2 in the roof horizontal direction B makes the heat transfer path from the climbing beam 1 to the purlin 2 and the heat transfer path from the purlin 2 to the climbing beam 1 longer. Therefore, compared with the configuration in which the climbing beams 1 and the purlins 2 overlap in the vertical direction, the time required for heat conduction between the climbing beams 1 and the purlins 2 becomes longer, and accordingly, heat absorption from the surroundings, heat radiation to the surroundings, etc. are promoted. Thereby, it is possible to suppress the climbing beams 1 and the purlins 2 from becoming a thermal bridge between the inside and outside of the house.

[0043] Also, as shown in FIG. 3, in the roof structure 100 of the present embodiment, in the roof horizontal direction B, at least one (two in this embodiment) purlins 2 are arranged between any two adjacent climbing beams 1. Conversely, in the roof structure 100 of the present embodiment, in the roof horizontal direction B, no climbing beam 1 is arranged between any two adjacent purlins 2. More specifically, when focusing on any two adjacent purlins 2 in the roof horizontal direction B, there are both positions where only one climbing beam 1 is arranged between these two purlins 2 and positions where no climbing beam 1 is arranged.

[0044] However, the arrangement of the climbing beam 1 and the purlin 2 in the roof horizontal direction B is not limited to the above-described arrangement shown in FIG. 3. In the roof horizontal direction B, for example, a configuration in which only one purlin 2 is arranged between any two adjacent climbing beams 1 may be adopted. Also, in the roof horizontal direction B, for example, a configuration in which at least one climbing beam 1 is arranged between any two adjacent purlins 2 may be adopted.

[0045] In addition, in the roof structure 100 of the present embodiment, the ceiling joist member 3 uses the ceiling material 21, but it is not limited to this configuration. The ceiling joist member 3 may be, for example, a structural facing material extending in the in-plane direction C of the pitched roof surface 203a so as to partition between the climbing beam 1 and the purlin 2. That is, a configuration in which the ceiling material 21 is removed from the roof structure 100 shown in FIGS. 2 and 3 and the facing material 4 is changed to a structural facing material may be adopted. By using the structural facing material as the ceiling joist member 3, the purlin 2 can be supported and the same airtightness as the facing material 4 can be realized. The structural facing material may be constituted by, for example, a wooden plywood having a thickness equal to or greater than a predetermined thickness. Note that the configuration of the ceiling joist member 3 is not particularly limited as long as it is configured to be supported by the climbing beam 1 and support the purlin 2.

[0046] The roof structure according to the present invention is not limited to the specific configuration described in the above-described embodiment, and various modifications, changes, and combinations are possible without departing from the scope of the claims.

Industrial Applicability

[0047] The present invention relates to a roof structure.

Explanation of Signs

[0048] 1: Climbing beam 2: Rafter 3: Rafter support member 4: Surface material 5: Sheathing 6: Heat insulating material 6a: First heat insulating material 6b: Second heat insulating material 7: Waterproof sheet 8: Exterior roof material 9: Interior roof material 9a: Interior base material 9b: Interior finishing material 10: Ridge beam 11: Eave beam 21: Main roof material 30: Opening 31: Opening 200: Building 200a: Foundation 200b: Upper structure 201: Outer wall 202: Floor part 203: Roof 203a: Sloping roof surface A: Roof inclination direction (an example of the extending direction of the climbing beam and the rafter) B: Roof horizontal direction C: In-plane direction of the sloping roof surface

Claims

1. A roof structure having a sloping roof surface, comprising: a climbing beam; a purlin; a purlin support member supported by the climbing beam and supporting the purlin; a floor board supported by the purlin, wherein the climbing beam and the purlin are arranged so as not to overlap in the vertical direction at any position in the in-plane direction of the sloping roof surface.

2. The roof structure according to claim 1, wherein the purlin support member is a ceiling joist extending in a direction intersecting the extending directions of the climbing beam and the purlin.

3. The roof structure according to claim 2, wherein the ceiling joist is spanned between two parallel climbing beams such that its upper surface is flush with the upper surfaces of the two climbing beams.

4. The roof structure according to claim 2 or 3, further comprising a facing material extending in the in-plane direction so as to partition between the climbing beam and the ceiling joist and the purlin.

5. The roof structure according to claim 1, wherein the purlin support member is a structural facing material extending in the in-plane direction so as to partition between the climbing beam and the purlin.

6. The roof structure according to any one of claims 1 to 3, further comprising a heat insulating material disposed at least one of between a plurality of parallel climbing beams and between a plurality of parallel purlins.

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