Building construction method and building structure

Abstract

To provide a method capable of improving workability of buildings with high thermal insulation performance.SOLUTION: A method of constructing a building is provided. The construction method includes: a first step of preparing an exterior wall panel 5 including wall insulation material 13; a second step of preparing a roof panel 6 including roof insulation material 22; a third step of preparing a roof beam 9; a fourth step of preparing a roof beam insulation material 7 for insulating the roof beam 9; a fifth step of installing a frame 4 including the roof beam 9; a sixth step of securing the wall panel 5 to a space below the roof beam 9 of the frame 4; a seventh step of securing the roof panel 6 to the roof beam 9; and an eighth step of placing the roof beam insulation material 7 between the wall insulation material 13 and the roof insulation material 22, after the sixth step and seventh step.SELECTED DRAWING: Figure 9

Description

[Technical field]

[0001] The present invention relates to a building construction method and a building structure. [Background technology]

[0002] 2. Description of the Related Art Various buildings have been proposed in the past in which exterior wall panels and roof panels are fixed via roof beams (see, for example, Patent Document 1 below). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2018-141281 A Summary of the Invention [Problem to be solved by the invention]

[0004] In recent years, interest in buildings with improved thermal insulation performance has been growing due to tight electricity supply and demand, unstable energy prices, etc. For example, arranging thermal insulation materials in exterior wall panels, roof beams, and roof panels is effective for improving the thermal insulation performance of buildings such as houses, but such a structure has a problem of reduced workability.

[0005] The present invention has been devised in view of the above-mentioned circumstances, and has as its main object to provide a method capable of improving the workability of buildings having high thermal insulation performance. [Means for solving the problem]

[0006] The present invention is a construction method for a building, comprising the steps of: a first step of preparing an exterior wall panel including wall insulation; a second step of preparing a roof panel including roof insulation; a third step of preparing a roof beam; a fourth step of preparing roof beam insulation for insulating the roof beam; a fifth step of installing a frame structure including the roof beam; a sixth step of fixing the exterior wall panel to the space below the roof beam of the frame structure; a seventh step of fixing the roof panel to the roof beam; and, after the sixth and seventh steps, an eighth step of arranging the roof beam insulation between the wall insulation and the roof insulation. Effect of the Invention

[0007] By employing the above-mentioned steps, the construction method of the present invention makes it possible to improve the construction workability of buildings having high thermal insulation performance. [Brief description of the drawings]

[0008] [Figure 1] FIG. 2 is a partial cross-sectional view showing an example of a building structure. [Diagram 2] FIG. 2 is an exploded cross-sectional view of FIG. [Diagram 3] FIG. [Figure 4] FIG. 2 is an exploded perspective view showing a portion of the roof panel. [Diagram 5] 11 is a flowchart showing the processing steps of a building construction method. [Figure 6] FIG. 11 is a partial cross-sectional view illustrating a fifth step of installing the frame structure. [Figure 7] FIG. 11 is a partial cross-sectional view illustrating a sixth step of fixing the exterior wall panel. [Figure 8] FIG. 13 is a partial cross-sectional view illustrating a seventh step of fixing the roof panel. [Figure 9] A partial cross-sectional view illustrating the eighth step of placing roof beam insulation. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. It should be understood that the drawings include exaggerated expressions and expressions different from the dimensional ratio of the actual structure in order to help understand the contents of the invention. Furthermore, the same or common elements are given the same reference numerals throughout the embodiments, and duplicated explanations are omitted. Furthermore, the specific configurations shown in the embodiments and drawings are for understanding the contents of the present invention, and the present invention is not limited to the specific configurations shown in the drawings.

[0010] [Building structure] FIG. 1 is a partial cross-sectional view showing an example of a building structure 1. FIG. 2 is an exploded cross-sectional view of FIG. 1. In FIG. 1 and FIG. 2, the position of each component of the building structure 1 may be specified on an orthogonal coordinate system of an x-axis, a y-axis, and a z-axis. The x-axis and z-axis directions are set horizontally. The z-axis direction is set horizontally in the indoor / outdoor direction (thickness direction of the exterior wall 12). The y-axis direction is set vertically.

[0011] 1, the building 2 of this embodiment is illustrated as a house 3, but is not particularly limited thereto, and may be, for example, a building. In addition, the house 3 is configured as, for example, an industrialized house, but is not particularly limited thereto.

[0012] The building structure (hereinafter sometimes referred to as "structure") 1 is composed of a frame structure 4, an exterior wall panel 5, a roof panel 6, and roof beam insulation 7. Furthermore, the structure 1 of this embodiment includes an interior panel 8. The exterior wall panel 5 includes wall insulation 13. The roof panel 6 includes roof insulation 22. Due to the roof beam insulation 7, wall insulation 13, and roof insulation 22, the building 2 has high insulation performance.

[0013] [Frame structure] The frame 4 includes a roof beam 9. The frame 4 of this embodiment further includes a base 10 and columns 34 (shown in FIG. 2 ). The base 10 and columns 34 may be the same as those used in the past.

[0014] The roof beam 9 is for supporting the roof panel 6 (roof 11 of the building 2). As shown in FIG. 2, the roof beam 9 of this embodiment includes a web 9A and a first flange 9B and a second flange 9C arranged on both sides of the web 9A in the longitudinal direction, and is configured as an H-shaped steel. The roof beam 9 is not limited to an H-shaped steel, and any type of steel may be adopted depending on, for example, the rigidity required of the building 2. In FIG. 1 and FIG. 2, the roof beam 9 on the eaves side is shown as a representative of the roof beams 9.

[0015] In this embodiment, the web 9A extends in the up-down direction (y-axis direction). The first flange 9B extends from the upper end of the web 9A in the indoor-outdoor direction (z-axis direction). The second flange 9C extends from the lower end of the web 9A in the indoor-outdoor direction (z-axis direction). The web 9A, the first flange 9B, and the second flange 9C form a pair of recesses 9a, 9b in the roof beam 9.

[0016] [Exterior wall panels] As shown in Fig. 1, the exterior wall panel 5 is for forming an exterior wall 12 of a building 2. In this embodiment, a plurality of exterior wall panels 5 are arranged along the outer periphery (exterior wall street) of the building 2. In this way, the exterior wall 12 of the building 2 is formed.

[0017] The exterior wall panel 5 is fixed to the space below the roof beam 9 of the frame 4. The exterior wall panel 5 of this embodiment is fixed between the roof beam 9 and a foundation 10. Figure 3 is a partial perspective view of the exterior wall panel 5.

[0018] As shown in Figs. 1 to 3, the exterior wall panel 5 includes a wall insulation material 13. The exterior wall panel 5 of this embodiment further includes a frame 14 and an exterior base material 15. The wall insulation material 13, the frame 14, and the exterior base material 15 are fixed together to form the exterior wall panel 5. This makes it possible to shorten the construction period of the building 2 and stabilize the quality of the exterior wall panel 5.

[0019] The wall insulation material 13 of this embodiment is disposed in a space surrounded by a frame 14. The wall insulation material 13 of this embodiment can be made of an insulation material including, for example, a fiber-based insulation material (rock wool, glass wool, etc.) or a foam-based insulation material (polystyrene foam, urethane foam, phenol foam, etc.).

[0020] The frame 14 is made of a metal such as steel. Such a frame 14 has higher rigidity than, for example, a frame (not shown) made of wood. Therefore, the durability of the exterior wall panel 5 is improved.

[0021] The frame 14 of this embodiment is composed of an upper horizontal frame member 14A and a lower horizontal frame member 14B shown in Fig. 1, and a vertical frame member 14C shown in Fig. 3. As shown in Fig. 1, the upper horizontal frame member 14A and the lower horizontal frame member 14B extend in the horizontal direction (x-axis direction). On the other hand, as shown in Fig. 3, the vertical frame member 14C extends in the up-down direction (y-axis direction). The upper horizontal frame member 14A and the lower horizontal frame member 14B are joined to the upper end side and the lower end side of the vertical frame member 14C to form a frame 14 that is rectangular in front view.

[0022] 1 to 3, the upper horizontal frame member 14A, the lower horizontal frame member 14B, and the vertical frame member 14C are configured to include a pair of flanges 18a, 18b, and a web 18c connecting the pair of flanges 18a, 18b. The pair of flanges 18a, 18b and the web 18c form the upper horizontal frame member 14A, the lower horizontal frame member 14B, and the vertical frame member 14C into a U-shaped cross section having one recess 18d.

[0023] 1 and 2, the upper horizontal frame member 14A and the lower horizontal frame member 14B are arranged so that their respective recesses 18d, 18d face the inside of the panel (the inside in the vertical direction of the frame 14). On the other hand, as shown in Fig. 3, the pair of vertical frame members 14C, 14C are arranged so that their respective recesses 18d, 18d face the inside of the panel (the inside in the horizontal direction of the frame 14).

[0024] The exterior base material 15 is disposed on one side (outdoor side So) in the thickness direction of the wall insulation material 13 (frame frame 14). The exterior base material 15 of this embodiment is formed in a rectangular plate shape when viewed from the front, and is fixed to the frame frame 14 via furring strips 16. As a result, a ventilation layer 17 extending in the vertical direction is formed in the exterior wall panel 5 between the exterior base material 15 and the wall insulation material 13. Such a ventilation layer 17 allows water vapor (humidity) that has infiltrated into the exterior wall panel 5 from inside the room to be discharged to the outside of the exterior wall panel 5 by the flow of air rising through the ventilation layer 17. Therefore, condensation in the exterior wall panel 5 and deterioration of the exterior wall panel 5 can be suppressed.

[0025] The exterior base material 15 is formed of, for example, a ceramic cement board or a foam concrete panel such as ALC. To the exterior base material 15, for example, an exterior material (decorative material) such as a tile (not shown) can be fixed.

[0026] As shown in Fig. 2, the exterior wall panel 5 of this embodiment is fixed to the roof beam 9 via an exterior wall panel fixing member 19. The exterior wall panel fixing member 19 of this embodiment includes a plate-shaped first portion 19A extending horizontally (z-axis direction) and a plate-shaped second portion 19B extending downward from one end of the outdoor side So of the first portion 19A, and is formed in an L-shape in side view. The exterior wall panel fixing members 19 are spaced apart in the horizontal direction (x-axis direction).

[0027] The upper surface of the first portion 19A is fixed to the lower surface of the second flange 9C of the roof beam 9. The side surface on the outdoor side So of the second portion 19B is fixed to the flange 18b on the indoor side Si of the pair of flanges 18a, 18b constituting the upper horizontal frame member 14A of the exterior wall panel 5. Fixing metal fittings 20 such as bolts are used for these fixations. The exterior wall panel 5 and the roof beam 9 can be firmly fixed by such exterior wall panel fixing member 19. Furthermore, the exterior wall panel 5 may be fixed to the base 10 or the like via the exterior wall panel fixing member 19, for example.

[0028] 1, in this embodiment, it is preferable that supplementary insulation 21 is disposed between the wall insulation 13 and the roof beam 9. Such supplementary insulation 21 provides a continuous insulation between the exterior wall panel 5 and the roof beam 9, improving the thermal insulation performance of the building 2. For example, the same material as the wall insulation 13 can be used as the supplementary insulation 21.

[0029] Roof Panel The roof panel 6 is for forming the roof 11 of the building 2. In this embodiment, a plurality of roof panels 6 are fixed to roof beams 9 and the like. In this way, the roof 11 of the building 2 is formed.

[0030] 1 and 2, the roof panel 6 includes a roof insulation material 22. The roof panel 6 of this embodiment further includes rafters 23 and sheathing boards 24. The roof insulation material 22, the rafters 23 and the sheathing boards 24 are fixed together to form the roof panel 6. This makes it possible to shorten the construction period of the building 2 and stabilize the quality of the roof panel 6. FIG. 4 is an exploded perspective view showing a part of the roof panel 6.

[0031] The rafters 23 have a slope (roof slope) that descends from the ridge side to the eaves side. In this embodiment, a plurality of rafters 23 are arranged at intervals along the outer periphery of the building 2 (along the outer wall).

[0032] The sheathing board 24 is formed in a panel shape. For example, a high-strength structural plywood can be used as the sheathing board 24 in this embodiment. As shown in FIG. 2, the lower surface 24d of the sheathing board 24 abuts against the upper surface 23u of the rafter 23 and is supported by the rafter 23. As a result, the sheathing board 24 is arranged along the slope (roof slope) of the rafter 23. Meanwhile, a roof finishing material (not shown) is arranged on the upper surface 24u of the sheathing board 24 via a waterproof sheet layer (not shown). For example, tiles, metal sheet roofing, slate roofing, or the like can be used as this roof finishing material.

[0033] The roof panel 6 of this embodiment is fixed to the roof beam 9 via a roof panel fixing member 25. The roof panel fixing member 25 of this embodiment is configured to include a first portion 25A, a second portion 25B, and a third portion 25C. Each of the first portion 25A, the second portion 25B, and the third portion 25C is formed in a plate shape.

[0034] The first portion 25A extends horizontally (z-axis direction) and has a surface (x-axis-z-axis plane) parallel to the upper surface of the first flange 9B of the roof beam 9. The second portion 25B extends upward from the first portion 25A and has a surface (y-axis-z-axis plane) parallel to the side of the rafter 23. The third portion 25C extends upward from the first portion 25A and has a surface (x-axis-y-axis plane) perpendicular to the side of the rafter 23.

[0035] The lower surface of first portion 25A is fixed to the upper surface of first flange 9B of roof beam 9. The side surface of second portion 25B is fixed to the side surface of rafter 23. Fixing metal fittings 26 such as bolts are used for these fixations. By using such roof panel fixing member 25, the roof panel 6 and roof beam 9 can be firmly fixed together.

[0036] The upper end 25u of the second portion 25B is inclined along the roof slope. By bringing such an upper end 25u into contact with the lower surface 24d of the sheathing board 24, the roof panel 6 can be easily positioned so that the roof panel 6 is inclined along the roof slope.

[0037] As shown in Figures 2 and 4, the roof insulation material 22 is disposed in at least a part of the space surrounded by a pair of adjacent rafters 23, 23 and a sheathing board 24. As shown in Figure 2, the underside 22d of the roof insulation material 22 of this embodiment is inclined along the roof slope. Such roof insulation material 22 insulates the roof 11 shown in Figure 1, making it possible to make effective use of the attic 27. The roof insulation material 22 of this embodiment can be composed of an insulation material containing, for example, a foam-based insulation material (polystyrene foam, urethane foam, phenol foam, or the like).

[0038] As shown in Fig. 2, it is preferable that the upper surface 22u of the roof insulation 22 is separated from the lower surface 24d of the sheathing board 24 in a direction perpendicular to the upper surface 22u of the roof insulation 22 (thickness direction of the roof insulation 22). As a result, a ventilation layer 30 extending along the roof slope is formed in the roof panel 6 between the roof insulation 22 and the sheathing board 24. Such a ventilation layer 30 allows water vapor (humidity) discharged from the ventilation layer 17 of the exterior wall panel 5 shown in Fig. 1 to the roof panel 6 side and water vapor (humidity) that has infiltrated from the room to the roof panel 6 side to be discharged to the outside of the roof panel 6 by the air flow along the ventilation layer 30.

[0039] As shown in Fig. 1, the roof insulation material 22 is preferably disposed in a position that covers the upper part of the ventilation layer 17 of the exterior wall panel 5. This prevents water vapor (moisture) discharged from the ventilation layer 17 to the roof panel 6 side from directly adhering to the underside 24d of the sheathing board 24, and can prevent condensation from occurring on the sheathing board 24. To effectively exert this effect, the shortest distance L1 between the eaves side end of the roof insulation material 22 and the ventilation layer 17 is preferably set to 20 mm or more.

[0040] [Interior panel] The interior panel 8 is fixed to the indoor side Si of the frame 14 of the exterior wall panel 5. As shown in Fig. 1 and Fig. 2, the interior panel 8 of this embodiment includes, for example, an interior insulation material 28 and an interior base material 29. The interior insulation material 28 and the interior base material 29 are fixed together, for example, via a frame 38. In this way, the interior panel 8 can be formed.

[0041] The interior insulation material 28 is disposed on the indoor side Si of the exterior wall panel 5, and is formed in a panel shape. The interior insulation material 28 may be made of an insulation material containing, for example, polystyrene foam, urethane foam, or phenol foam. The interior base material 29 is made of, for example, gypsum board. The interior base material 29 is disposed on the indoor side Si of the interior insulation material 28.

[0042] [Roof beam insulation] As shown in Fig. 1, the roof beam insulation material 7 is for insulating the roof beams 9. This roof beam insulation material 7 is disposed between the wall insulation material 13 and the roof insulation material 22. The roof beam insulation material 7, the wall insulation material 13, and the roof insulation material 22 can provide insulation material across the exterior wall panel 5, the roof beams 9, and the roof panel 6. This improves the insulation performance of the building 2.

[0043] The roof beam insulation 7 is preferably arranged so as to be continuous with the wall insulation 13 and the roof insulation 22. This further improves the thermal insulation performance of the building 2. In this embodiment, the roof beam insulation 7 and the wall insulation 13 are arranged so as to be continuous with each other through the supplementary insulation 21, but the present invention is not limited to such an embodiment. In this embodiment, the second flange 9C of the roof beam 9 shown in FIG. 2 and the first part 19A of the exterior wall panel fixing member 19 are arranged between the supplementary insulation 21 and the roof beam insulation 7. As described above, the exterior wall panel fixing member 19 is spaced apart in the horizontal direction (x-axis direction), so that a vertical gap (not shown) is formed in the x-axis direction. The supplementary insulation 21 and the roof beam insulation 7 are partially in contact with each other through this gap, so that the thermal insulation between the supplementary insulation 21 and the roof beam insulation 7 is maintained. Therefore, the supplementary insulation 21 and the roof beam insulation 7 are treated as being arranged so as to be continuous with each other.

[0044] The roof beam insulation material 7 is configured to include a first beam insulation material 31 and a second beam insulation material 32.

[0045] The first beam insulation material 31 constitutes part of the roof beam insulation material 7, and is in contact with at least a part of the roof beam 9. The first beam insulation material 31 of this embodiment is disposed in the recess 9a on the outdoor side So of the pair of recesses 9a, 9b of the roof beam 9 shown in Fig. 2, and is formed in a substantially rectangular cross section.

[0046] The first beam insulation material 31 is preferably configured to include a fiber-based insulation material. Since such a first beam insulation material 31 has flexibility, it can flexibly deform along the recess 9a of the roof beam 9. This can suppress the formation of a gap between the first beam insulation material 31 and the recess 9a. Therefore, the first beam insulation material 31 can improve the insulation performance and soundproofing performance (sound absorption performance) of the roof beam 9. Examples of fiber-based insulation materials include rock wool and glass wool, but are not particularly limited thereto.

[0047] 1, when the first beam insulation material 31 is disposed in the recess 9a, the end 31t of the outdoor side So of the first beam insulation material 31 is preferably disposed closer to the outdoor side So than the end 9t of the outdoor side So of the roof beam 9 (first flange 9B and second flange 9C). This allows a large amount of the first beam insulation material 31, including the fiber-based insulation material, to be disposed in the recess 9a of the roof beam 9, thereby further improving the insulation performance and soundproofing performance.

[0048] The second beam insulation 32 constitutes part of the roof beam insulation 7, and is arranged on the outside (outdoor side So) of the first beam insulation 31. This second beam insulation 32 is harder than the first beam insulation 31. By arranging such second beam insulation 32 on the outside of the flexible first beam insulation 31, the first beam insulation 31 can be stably held (sandwiched) between the second beam insulation 32 and the roof beam 9. Therefore, the workability and insulation performance of the building 2 are improved.

[0049] The second beam insulation material 32 is preferably configured to include a foam-based insulation material. Since such a second beam insulation material 32 has moisture-proofing properties, it is possible to suppress condensation in the first beam insulation material 31 while minimizing moisture-proofing processing of the first beam insulation material 31. Therefore, the workability of the building is improved.

[0050] Furthermore, the second beam insulation material 32 has excellent insulation performance of a foam insulation material, which improves the insulation performance of the building 2. Examples of foam insulation materials include, but are not limited to, polystyrene foam, urethane foam, and phenol foam.

[0051] It is preferable that at least a portion of the second beam insulation 32 is sandwiched (pressed in) between the lower surface 22d of the roof insulation 22 and the upper end 5u of the exterior wall panel 5. Such second beam insulation 32 allows the insulation material to be continuously arranged between the roof insulation 22 and the exterior wall panel 5, improving the insulation performance of the building 2. Furthermore, the second beam insulation 32 is stably held between the lower surface 22d of the roof insulation 22 and the upper end 5u of the exterior wall panel 5, improving the workability of the building 2.

[0052] 2, the second beam insulation 32 has an upper inclined surface 32u that is inclined along the roof slope and abuts against the lower surface 22d of the roof insulation 22. Such upper inclined surface 32u allows the second beam insulation 32 to be in close contact with the lower surface 22d of the roof insulation 22, thereby improving the insulation performance of the building 2.

[0053] The lower surface 32d of the second beam insulation material 32 extends horizontally (z-axis direction) along the web 18c of the upper horizontal frame member 14A of the exterior wall panel 5. As a result, the second beam insulation material 32 is formed in a trapezoidal cross section whose length in the vertical direction (y-axis direction) gradually decreases from the indoor side Si to the outdoor side So. At least a part of the second beam insulation material 32 is wedged (pressed in) between the lower surface 22d of the roof insulation material 22 shown in FIG. 1 and the upper end 5u of the exterior wall panel 5, thereby preventing the second beam insulation material 32 from falling out to the outdoor side So. As a result, the second beam insulation material 32 is stably held between the lower surface 22d of the roof insulation material 22 and the upper end 5u of the exterior wall panel 5, improving the workability of the building 2. In this embodiment, the end 31t of the outdoor side So of the first beam insulation material 31 is disposed closer to the outdoor side So than the end 9t of the outdoor side So of the roof beam 9 (first flange 9B and second flange 9C). This allows the second beam insulation material 32 to be stably held by the repulsive force of the first beam insulation material 31 against the second beam insulation material 32 (outdoor side So).

[0054] [Building construction method] Next, a construction method for the building 2 (hereinafter, sometimes referred to as the "construction method") will be described. Fig. 5 is a flowchart showing the processing procedure of the construction method for a building.

[0055] [Prepare the exterior wall panels (first step)] In the construction method of this embodiment, first, the exterior wall panel 5 shown in Figures 1 and 3 is prepared (first step S1). As shown in Figure 1, in this embodiment, a plurality of exterior wall panels 5 are arranged along the periphery (exterior wall street) of the building 2 to form the exterior wall 12 of the building 2. For this reason, in the first step S1, a plurality of exterior wall panels 5 are prepared.

[0056] In the first step S1 of this embodiment, first, as shown in Figures 1 and 3, a frame 14 is prepared. As described above, the frame 14 includes the upper horizontal frame member 14A and the lower horizontal frame member 14B shown in Figure 1, and the vertical frame member 14C shown in Figure 3. The upper horizontal frame member 14A and the lower horizontal frame member 14B are joined to the upper end side and the lower end side of the vertical frame member 14C to form a frame 14 that is rectangular in front view. The upper horizontal frame member 14A and the lower horizontal frame member 14B are joined to the vertical frame member 14C by, for example, welding or the like.

[0057] Next, in the first step S1 of this embodiment, the wall insulation material 13 is disposed in the space surrounded by the frame 14. Details of the wall insulation material 13 are as described above.

[0058] Next, in the first step S1 of this embodiment, an exterior base material 15 is disposed on one side in the thickness direction of the wall insulation material 13. The exterior base material 15 is formed in a rectangular plate shape when viewed from the front, and is fixed to the frame 14 via furring strips 16. As a result, a ventilation layer 17 extending vertically is formed between the exterior base material 15 and the wall insulation material 13.

[0059] In the first step S1 of this embodiment, by carrying out the above procedure, an exterior wall panel 5 including a wall insulation material 13, an exterior base material 15, and a ventilation layer 17 can be prepared as shown in Fig. 1 to Fig. 3. Such an exterior wall panel 5 may be prepared at the construction site of the building 2, but is preferably prepared in advance in a factory or the like. This can shorten the construction period of the building 2 and stabilize the quality of the exterior wall panel 5.

[0060] [Prepare the roof panels (step 2)] Next, in the construction method of this embodiment, as shown in Figures 1 and 4, a roof panel 6 is prepared (second step S2). As shown in Figure 1, in this embodiment, a roof 11 of the building 2 is formed by fixing a plurality of roof panels 6 to roof beams 9 and the like. For this reason, in the second step S2, a plurality of roof panels 6 are prepared.

[0061] In the second step S2 of this embodiment, first, a plurality of rafters 23 are arranged with a gap therebetween, as shown in Fig. 4. Next, in the second step S2 of this embodiment, the roof insulation material 22 is arranged between a pair of adjacent rafters 23, 23. At this time, the upper surface 22u of the roof insulation material 22 is located below the upper surface 23u of the rafter 23. Then, the roof insulation material 22 and the rafter 23 are fixed together. To fix the roof insulation material 22 and the rafter 23 together, for example, a known fixing member (not shown) is used.

[0062] Next, in the second step S2 of this embodiment, as shown in Fig. 2 and Fig. 4, the lower surface 24d of the sheathing board 24 is abutted against the upper surface 23u of the rafter 23. Then, the rafter 23 and the sheathing board 24 are fixed together. For example, fixing members (not shown) such as screws are used to fix the rafter 23 and the sheathing board 24 together.

[0063] In the second step S2 of this embodiment, the above procedure is carried out to prepare a roof panel 6 including roof insulation 22, rafters 23, and sheathing board 24, as shown in Figures 1 and 2. In the roof panel 6 of this embodiment, the upper surface 22u of the roof insulation 22 is separated from the lower surface 24d of the sheathing board 24. As a result, a ventilation layer 30 is formed in the roof panel 6 between the roof insulation 22 and the sheathing board 24, extending along the roof slope.

[0064] The roof panel 6 may be prepared at the construction site of the building 2, but is preferably prepared in advance in a factory etc. This can shorten the construction period of the building 2 and stabilize the quality of the roof panel 6.

[0065] [Prepare roof beams (3rd step)] Next, in the construction method of this embodiment, the roof beam 9 shown in Figures 1 and 2 is prepared (third step S3). The roof beam 9 in this embodiment constitutes the frame structure 4 of the building 2. Therefore, in the third step S3, a plurality of roof beams 9 required to constitute the frame structure 4 are prepared.

[0066] 2, the roof beam 9 includes a web 9A, a first flange 9B, and a second flange 9C, and is configured as an H-shaped steel. Such a roof beam 9 is preferably prepared (manufactured) in advance in a factory or the like.

[0067] [Prepare roof beam insulation (4th step)] Next, in the construction method of this embodiment, roof beam insulation material 7 is prepared (fourth step S4). As described above, in this embodiment, a plurality of roof beams 9 are prepared. Therefore, in the fourth step S4, a plurality of roof beam insulation materials 7 for insulating each of the plurality of roof beams 9 are prepared.

[0068] The roof beam insulation material 7 of this embodiment is composed of a first beam insulation material 31 and a second beam insulation material 32. These first beam insulation material 31 and second beam insulation material 32 each constitute a part of the roof beam insulation material 7. These first beam insulation material 31 and second beam insulation material 32 are preferably prepared (manufactured) in advance in a factory or the like.

[0069] [Prepare the first beam insulation] In the fourth step S4 of this embodiment, first, a step of preparing the first beam insulation material 31 is carried out. In this step, at least a part (in this example, all) of the first beam insulation material 31 is made of the above-mentioned fiber-based insulation material. In this way, the first beam insulation material 31 having flexibility can be prepared.

[0070] In this embodiment, before the first beam insulation 31 is placed in the recess 9a, the cross-sectional area of ​​the first beam insulation 31 is set to be equal to or larger than the area of ​​the recess 9a on the outdoor side So of the roof beam 9. This makes it possible to prepare a first beam insulation 31 that can be placed (embedded) over the entire area of ​​the recess 9a. The cross-sectional area of ​​the first beam insulation 31 is determined in a cross section along the y-z plane. The area of ​​the recess 9a is determined in a cross section along the y-z plane in the area surrounded by the web 9A, the first flange 9B, and the second flange 9C.

[0071] [Prepare the second beam insulation] Next, in the fourth step S4 of this embodiment, a step of preparing the second beam insulation material 32 is carried out. In this step, at least a part (in this example, all) of the second beam insulation material 32 is made of the foam-based insulation material described above. This allows the second beam insulation material 32, which is harder than the first beam insulation material 31, to be prepared.

[0072] In this embodiment, a second beam insulation material 32 is prepared that has an upper inclined surface 32u that inclines along the roof slope. Furthermore, in this embodiment, a second beam insulation material 32 is prepared that has a lower surface 32d that extends in the horizontal direction (x-axis direction). This forms a second beam insulation material 32 that has a trapezoidal cross section whose length in the up-down direction (y-axis direction) gradually decreases. Such upper inclined surface 32u and lower surface 32d can be easily formed by cutting the foam insulation material that constitutes the second beam insulation material 32 along the roof slope.

[0073] [Installing the structure including the roof beams (5th step)] Next, in the construction method of this embodiment, the frame structure 4 including the roof beam 9 shown in Fig. 1 is installed (fifth step S5). In the fifth step S5 of this embodiment, the frame structure 4 can be installed based on the same procedure as in the conventional method. Fig. 6 is a partial cross-sectional view for explaining the fifth step S5 of installing the frame structure 4.

[0074] In the fifth step S5 of this embodiment, first, the base 10 is installed on the foundation 33 of the building 2. Next, in the fifth step S5 of this embodiment, a plurality of pillars 34 are installed at intervals along the longitudinal direction (x-axis direction) of the base 10. Then, the roof beams 9 are fixed so as to straddle adjacent pillars 34. In this way, the frame structure 4 is installed.

[0075] [Fixing the exterior wall panels (step 6)] Next, in the construction method of this embodiment, the exterior wall panel 5 shown in Fig. 1 is fixed to the lower space 35 of the roof beam 9 of the frame 4 shown in Fig. 6 (sixth step S6). In this embodiment, the lower space 35 is specified as the space surrounded by the roof beam 9, the foundation 10, and the pillar 34. Fig. 7 is a partial cross-sectional view for explaining the sixth step S6 of fixing the exterior wall panel 5.

[0076] As shown in Fig. 1, in this embodiment, a plurality of exterior wall panels 5 are arranged along the periphery (exterior wall street) of a building 2 to form an exterior wall 12 of the building 2. For this reason, in the sixth step S6 of this embodiment, a plurality of exterior wall panels 5 shown in Fig. 7 are fixed to the spaces 35 below the roof beams 9 shown in Fig. 6. Exterior wall panel fixing members 19 are used to fix these exterior wall panels 5 to the roof beams 9.

[0077] In the sixth step S6 of this embodiment, first, the exterior wall panel fixing member 19 is fixed to the roof beam 9. In this embodiment, the upper surface of the first portion 19A of the exterior wall panel fixing member 19 is fixed to the lower surface of the second flange 9C of the roof beam 9. Fixing metal fittings 20 such as bolts are used to fix the exterior wall panel fixing member 19 to the roof beam 9.

[0078] Next, in a sixth step S6 of this embodiment, the exterior wall panel 5 is placed in the space 35 (shown in FIG. 6 ) below the roof beam 9 of the frame 4, and fixed to the exterior wall panel fixing member 19. In this embodiment, of the pair of flanges 18a, 18b constituting the upper horizontal frame member 14A of the exterior wall panel 5, the flange 18b on the indoor side Si is fixed to the exterior wall panel fixing member 19, at its outdoor side So. Fixing metal fittings 20 such as bolts are used to fix the exterior wall panel fixing member 19 to the exterior wall panel 5.

[0079] In this way, in the sixth step S6, by using the exterior wall panel fixing member 19, the exterior wall panel 5 can be easily fixed to the space 35 below the roof beam 9 of the frame 4. Therefore, the workability of the building 2 is improved.

[0080] In the sixth step S6 of this embodiment, the exterior wall panels 5 are sequentially fixed to the spaces 35 below the roof beams 9 along the outer periphery (exterior wall street) of the building 2. These exterior wall panels 5 may be fixed not only to the roof beams 9 but also to the foundations 10, columns 34, etc. via exterior wall panel fixing members 19, for example.

[0081] [Fixing the roof panel to the roof beams (step 7)] Next, in the construction method of this embodiment, the roof panel 6 shown in Figures 1 and 2 is fixed to the roof beams 9 (seventh step S7). Figure 8 is a partial cross-sectional view for explaining the seventh step S7 of fixing the roof panel 6.

[0082] As shown in Fig. 1, in this embodiment, a roof 11 (shown in Fig. 1) of a building 2 is formed by fixing a plurality of roof panels 6 to roof beams 9 and the like. For this reason, in a seventh step S7 of this embodiment, the plurality of roof panels 6 are fixed respectively. Roof panel fixing members 25 are used to fix these roof panels 6 to the roof beams 9.

[0083] In the seventh step S7 of this embodiment, first, the roof panel fixing member 25 is fixed to the roof beam 9. In this embodiment, the lower surface of the first portion 25A of the roof panel fixing member 25 is fixed to the upper surface of the first flange 9B of the roof beam 9. To fix the roof panel 6 and the roof panel fixing member 25, a fixing metal fitting 26 such as a bolt is used.

[0084] Next, in the seventh step S7 of this embodiment, the roof panel 6 is placed above the roof beams 9 and fixed to the roof panel fixing member 25. In the roof panel fixing member 25 of this embodiment, the upper end 25u of the second portion 25B is inclined along the roof slope. This upper end 25u abuts against the lower surface 24d of the sheathing board 24 of the roof panel 6, making it possible to easily tilt the roof panel 6 along the roof slope. This improves the ease of construction of the building 2.

[0085] In this embodiment, a side surface of the second portion 25B of the roof panel fixing member 25 is fixed to a side surface of the rafter 23. The roof panel fixing member 25 and the rafter 23 are fixed together using fixing metal fittings (not shown) such as bolts.

[0086] In this way, in the seventh step S7, by using the roof panel fixing member 25, the roof panel 6 can be tilted along the roof slope, and the exterior wall panel 5 tilted along the roof slope can be easily fixed to the roof beams 9. This improves the ease of construction of the building 2. Furthermore, in the seventh step S7, by tilting the roof panel 6 along the roof slope, the underside 22d of the roof insulation 22 can be easily tilted along the roof slope.

[0087] In the seventh step S7 of this embodiment, the roof panel 6 is fixed so that the roof insulation material 22 covers the upper side of the ventilation layer 17 of the exterior wall panel 5. This makes it possible to construct the building 2 in such a way that the water vapor (moisture) discharged from the ventilation layer 17 to the roof panel 6 side is prevented from directly adhering to the underside 24d of the sheathing board 24, and condensation on the sheathing board 24 can be prevented.

[0088] In the seventh step S7 of this embodiment, a plurality of roof panels 6 are fixed in sequence along the roof beams 9. These roof panels 6 may be fixed to members other than the roof beams 9.

[0089] [Placing roof beam insulation (step 8)] Next, in the construction method of this embodiment, the roof beam insulation 7 shown in Figures 1 and 2 is placed between the wall insulation 13 and the roof insulation 22 (eighth step S8). The eighth step S8 of this embodiment is performed after the sixth step S6 and the seventh step S7. Figure 9 is a partial cross-sectional view explaining the eighth step S8 of placing the roof beam insulation 7.

[0090] In the construction method of this embodiment, a sixth step S6 of fixing the exterior wall panel 5 to the roof beam 9 and a seventh step S7 of fixing the roof panel 6 to the roof beam 9 are carried out prior to an eighth step S8 of arranging the roof beam insulation material 7. This ensures that the roof beam insulation material 7 fixed to the roof beam 9 does not impede the adhesion of the exterior wall panel 5 and the roof panel 6 to the roof beam 9. This improves the construction of the building 2 with high insulation performance.

[0091] Furthermore, in the construction method of this embodiment, after the exterior wall panel 5 and the roof panel 6 are fixed to the roof beam 9, the roof beam insulation 7 is placed between the wall insulation 13 and the roof insulation 22. This makes it possible to easily connect, for example, the wall insulation 13 and the roof insulation 22 via the roof beam insulation 7. This improves the construction of the building 2 with high insulation performance.

[0092] In the eighth step S8 of this embodiment, first, a step of arranging the first beam insulation material 31 so as to contact at least a part of the roof beam 9 is carried out. In this embodiment, the first beam insulation material 31 is arranged (filled) in the recess 9a on the outdoor side So of the pair of recesses 9a, 9b of the roof beam 9. This improves the insulation performance and soundproofing performance (sound absorption performance) of the roof beam 9.

[0093] As described above, the cross-sectional area of ​​the first beam insulation 31 is set to be equal to or larger than the area of ​​the recess 9a (the portion surrounded by the web 9A, the first flange 9B, and the second flange 9C) of the roof beam 9. This allows the first beam insulation 31 to be disposed (embedded) over the entire area of ​​the recess 9a. As shown in Fig. 1, in this embodiment, the end 31t of the outdoor side So of the first beam insulation 31 is disposed closer to the outdoor side So than the end 9t of the outdoor side So of the roof beam 9 (the first flange 9B and the second flange 9C).

[0094] Next, in an eighth step S8 of this embodiment, as shown in FIG. 9, a step of arranging second beam insulation material 32 on the outer side of first beam insulation material 31 is carried out.

[0095] The second beam insulation material 32 is composed of a foam-based insulation material having moisture-proofing properties. Therefore, by disposing the second beam insulation material 32 so as to cover the outside of the first beam insulation material 31, it becomes possible to prevent condensation from occurring on the first beam insulation material 31 without the need to apply a moisture-proofing material or the like to the first beam insulation material 31. Therefore, the workability of the building 2 is improved.

[0096] The second beam insulation material 32 has an upper inclined surface 32u inclined along the roof slope and a lower surface 32d extending in the horizontal direction (x-axis direction). In the eighth step S8 of this embodiment, the upper inclined surface 32u of the second beam insulation material 32 is abutted against the lower surface 22d of the roof insulation material 22 so that at least a part of the second beam insulation material 32 is sandwiched (pressed in) between the lower surface 22d of the roof insulation material 22 and the upper end 5u of the exterior wall panel 5. As a result, the second beam insulation material 32 is sandwiched in a wedge shape between the lower surface 22d of the roof insulation material 22 and the upper end 5u of the exterior wall panel 5, and can be stably held therebetween. Therefore, workability is improved.

[0097] In the eighth step S8 of this embodiment, the first beam insulation 31 and the second beam insulation 32 are arranged, so that the roof beam insulation 7 can be arranged between the wall insulation 13 and the roof insulation 22.

[0098] In the eighth step S8 of this embodiment, the roof beam insulation 7 (first beam insulation 31 and second beam insulation 32) is arranged so as to be continuous with the wall insulation 13 and the roof insulation 22. In this embodiment, as shown in Fig. 1, the roof beam insulation 7 and the wall insulation 13 are arranged so as to be continuous with each other via the supplementary insulation 21, but the present invention is not limited to such an embodiment.

[0099] In this manner, in this embodiment, the first step S1 to the eighth step S8 are performed in sequence to form a building 2 in which an exterior wall panel 5 and a roof panel 6 are fixed to a roof beam 9, as shown in Fig. 1. In such a building 2, the wall insulation 13 and the roof insulation 22 are arranged continuously via the roof beam insulation 7, and therefore the building 2 has high insulation performance.

[0100] In the construction method of this embodiment, the interior panel 8, supplementary insulation material 21, ceiling 36, and floor 37 can be installed at any time. Installation of the interior panel 8, ceiling 36, and floor 37 is not hindered by the roof beam insulation material 7, improving workability.

[0101] Although a particularly preferred embodiment of the present invention has been described in detail above, the present invention is not limited to the illustrated embodiment and can be modified in various ways.

[0102] [Note] The present invention includes the following aspects.

[0103] [Invention 1] A method of constructing a building, comprising: A first step of providing an exterior wall panel including wall insulation; A second step of providing a roof panel including the roof insulation; The third step is to prepare the roof beams; A fourth step of preparing a roof beam insulation material for insulating the roof beam; A fifth step of installing a frame including the roof beam; A sixth step of fixing the exterior wall panel to a space below the roof beam of the frame; A seventh step of fastening the roof panel to the roof beam; and an eighth step of disposing the roof beam insulation between the wall insulation and the roof insulation after the sixth step and the seventh step. Building construction methods. [Invention 2] The eighth step is a construction method for a building described in Invention 1, in which the roof beam insulation is arranged so as to be continuous with the wall insulation and the roof insulation. [Invention 3] The fourth step comprises: preparing a first beam insulation material constituting a part of the roof beam insulation material; and preparing a second beam insulation material that constitutes a part of the roof beam insulation material and is harder than the first beam insulation material; The eighth step comprises: placing the first joist insulation in contact with at least a portion of the roof joist; A construction method for a building as described in the present invention 1 or 2, comprising a step of placing the second beam insulation material on the outside of the first beam insulation material. [Invention 4] The step of preparing the first beam insulation material comprises forming at least a portion of the first beam insulation material from a fiber-based insulation material; The building structure according to the third aspect of the present invention, wherein the step of preparing the second beam insulation comprises constructing at least a portion of the second beam insulation using a foam-based insulation material. [Invention 5] The step of preparing the second beam insulation material includes preparing the second beam insulation material having an upper inclined surface inclined along the roof slope; The seventh step is to fix the roof panel so that the lower surface of the roof insulation is inclined along the roof slope, The step of arranging the second beam insulation includes abutting the upper inclined surface of the second beam insulation against the lower surface of the roof insulation so that at least a portion of the second beam insulation is sandwiched between the lower surface of the roof insulation and the upper end of the exterior wall panel. 5. A method for constructing a building according to claim 3 or 4 of the present invention. [Invention 6] The first step includes preparing the exterior wall panel including the wall insulation material, an exterior base material arranged on one side of the wall insulation material in a thickness direction, and a ventilation layer extending vertically between the exterior base material and the wall insulation material, The construction method for a building according to any one of Inventions 1 to 5, wherein the seventh step comprises fixing the roof panel so that the roof insulation material covers an upper part of the ventilation layer. [Invention 7] A building structure comprising: A frame structure including a roof beam; An exterior wall panel fixed to a space below the roof beam of the frame structure and including a wall insulation material; a roof panel secured to the roof beam and including roof insulation; and a roof joist insulation disposed between the wall insulation and the roof insulation, The roof beam insulation material includes a first beam insulation material and a second beam insulation material arranged outside the first beam insulation material and harder than the first beam insulation material. Building structure. [Invention 8] The building structure of invention 7, wherein the roof beam insulation is arranged so as to be continuous with the wall insulation and the roof insulation. [The present invention 9] The first beam insulation material includes a fiber-based insulation material; The building structure according to claim 7 or 8, wherein the second beam insulation material comprises a foam-based insulation material. [The present invention 10] The lower surface of the roof insulation is inclined along the roof slope, A building structure described in any of Inventions 7 to 9, wherein the second beam insulation has an upper inclined surface that inclines along the roof slope so that at least a portion of the second beam insulation is sandwiched between the underside of the roof insulation and the upper end of the exterior wall panel, and abuts the underside of the roof insulation. [The present invention 11] The exterior wall panel further includes an exterior base material arranged on one side of the wall insulation material in the thickness direction, and a ventilation layer extending vertically between the exterior base material and the wall insulation material, A building structure according to any one of claims 7 to 10, wherein the roof insulation material is arranged in a position covering the upper part of the ventilation layer. [Explanation of symbols]

[0104] 4 Frame structure 5. Exterior wall panels 6 Roof Panels 7. Roof beam insulation 9 Roof Beams 13 Wall insulation 22 Roof insulation

Claims

1. A method of constructing a building, comprising: A first step of providing an exterior wall panel including wall insulation; A second step of providing a roof panel including the roof insulation; A third step of preparing a roof beam; A fourth step of preparing a roof beam insulation material for insulating the roof beam; A fifth step of installing a frame structure including the roof beam; A sixth step of fixing the exterior wall panel to a space below the roof beam of the frame; A seventh step of fastening the roof panel to the roof beams; and an eighth step of disposing the roof beam insulation between the wall insulation and the roof insulation after the sixth step and the seventh step. Building construction methods.

2. The method for constructing a building according to claim 1 , wherein the eighth step comprises arranging the roof beam insulation material so as to be continuous with the wall insulation material and the roof insulation material.

3. The fourth step comprises: preparing a first beam insulation material constituting a part of the roof beam insulation material; and preparing a second beam insulation material that constitutes a part of the roof beam insulation material and is harder than the first beam insulation material; The eighth step comprises: placing the first joist insulation in contact with at least a portion of the roof joist; The method for constructing a building according to claim 1, further comprising the step of: placing the second beam insulation material on the outside of the first beam insulation material.

4. The step of preparing the first beam insulation material comprises forming at least a portion of the first beam insulation material from a fiber-based insulation material; The building structure according to claim 3 , wherein the step of preparing the second beam insulation comprises constructing at least a portion of the second beam insulation from a foam-based insulation material.

5. The step of preparing the second beam insulation material includes preparing the second beam insulation material having an upper inclined surface inclined along the roof slope; The seventh step is to fix the roof panel so that the lower surface of the roof insulation is inclined along the roof slope, The step of arranging the second beam insulation material includes abutting the upper inclined surface of the second beam insulation material against the lower surface of the roof insulation material so that at least a portion of the second beam insulation material is sandwiched between the lower surface of the roof insulation material and the upper end of the exterior wall panel. A method for constructing a building according to claim 3 or 4.

6. The first step includes preparing the exterior wall panel including the wall insulation material, an exterior base material arranged on one side of the wall insulation material in a thickness direction, and a ventilation layer extending vertically between the exterior base material and the wall insulation material, 2. The method for constructing a building according to claim 1, wherein the seventh step comprises fixing the roof panel so that the roof insulation material covers an upper portion of the ventilation layer.

7. A building structure comprising: A frame structure including a roof beam; An exterior wall panel fixed to a space below the roof beam of the frame structure and including a wall insulation material; a roof panel secured to the roof beam and including roof insulation; and a roof joist insulation disposed between the wall insulation and the roof insulation, The roof beam insulation material includes a first beam insulation material and a second beam insulation material arranged outside the first beam insulation material and harder than the first beam insulation material. Building structure.

8. 8. The building structure of claim 7, wherein the roof joist insulation is arranged so as to be continuous with the wall insulation and the roof insulation.

9. The first beam insulation material includes a fiber-based insulation material; The building structure of claim 7 , wherein the second beam insulation comprises a foam-based insulation material.

10. The lower surface of the roof insulation is inclined along the roof slope, A building structure as described in any one of claims 7 to 9, wherein the second beam insulation has an upper inclined surface that inclines along the roof slope so that at least a portion of the second beam insulation is sandwiched between the underside of the roof insulation and the upper end of the exterior wall panel, and abuts the underside of the roof insulation.

11. The exterior wall panel further includes an exterior base material arranged on one side of the wall insulation material in the thickness direction, and a ventilation layer extending vertically between the exterior base material and the wall insulation material, The building structure according to claim 7 , wherein the roof insulation material is arranged in a position covering the upper part of the ventilation layer.

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