Roof structure

Abstract

To provide a fastening fitting and a roof structure that can easily improve the accuracy of screw positioning when fastening a first roof panel to a main building. [Solution] A fastening fitting 16 fastens a first roof panel 11 to a purlin 18. The first roof panel 11 has a first fitting portion 41. The first fitting portion 41 is provided at one end of the first roof panel 11 in the short side direction, and has a recess 42 recessed on the other side of the first roof panel 11 in the short side direction, and a step 43 provided above the recess 42 and on the other side of the first roof panel 11 in the short side direction than the bottom surface of the recess 42. The fastening fitting 16 includes a plate-like member 55 arranged above the recess 42 and on one side of the step 43 in the short side direction of the first roof panel 11, a latching portion 56 provided on the plate-like member 55 and latched into the recess 42, and one or more screw holes 57 passing through the plate-like member 55.

Description

Technical Field

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

Background Art

[0002] A roof structure in which a plurality of roof panels are connected is known (see, for example, Patent Document 1). Patent Document 1 discloses a flat roof in which a heat insulation panel as a roof panel is connected by fitting a fitting convex portion and a fitting concave portion. The heat insulation panel is retained to the building body by driving a fixing tool such as a screw or a nail from above the heat insulation panel to the building body such as a main roof. The gap between adjacent heat insulation panels is closed with a tape using aluminum foil.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the flat roof described in Patent Document 1, it is difficult to position the fixing tool when retaining the heat insulation panel to the building body.

[0005] An object of the present invention is to provide a retaining fitting and a roof structure that can easily improve the accuracy of screw positioning when retaining a first roof panel to a main roof.

Means for Solving the Problems

[0006] The retaining fitting according to the present invention is a retaining fitting for retaining a roof structure including a first roof panel having a first fitting portion and a second roof panel having a second fitting portion that fits with the first fitting portion to a main house. Each of the first roof panel and the second roof panel has a heat insulating material and two metal outer skins facing each other through the heat insulating material. The first fitting portion is provided at one end in the short side direction of the first roof panel, and has a recess recessed on the other side in the short side direction of the first roof panel, and a step portion provided above the recess and on the other side in the short side direction of the first roof panel than the bottom surface of the recess. The second fitting portion is provided at the other end in the short side direction of the second roof panel, and has a convex portion that protrudes to the other side in the short side direction of the second roof panel and fits with the recess, and a lid portion provided above the convex portion with a space therebetween and extending to the other side in the short side direction of the second roof panel to cover the step portion. It includes a plate-like member disposed above the recess and on one side of the step portion in the short side direction of the first roof panel, a catching portion provided on the plate-like member and caught in the recess, and one or more screw holes penetrating the plate-like member.

[0007] The roof structure according to the present invention includes the above-mentioned retaining fitting, a first roof panel provided on a plurality of main roofs and having a first fitting portion, and a plurality of the main roofs provided adjacent to the first roof panel and having a second fitting portion that fits with the first fitting portion. A second roof panel, and a waterproof and airtight tape attached to the upper surfaces of the first roof panel and the second roof panel so as to cover a gap between the first fitting portion and the second fitting portion. Each of the first roof panel and the second roof panel has a heat insulating material and two metal outer skins facing each other through the heat insulating material. The first fitting portion is provided at one end of the first roof panel in the short side direction, and includes a recess recessed on the other side of the first roof panel in the short side direction, and a step portion provided above the recess and on the other side of the first roof panel in the short side direction than the bottom surface of the recess. The second fitting portion is provided at one end of the second roof panel in the short side direction, and includes a convex portion protruding on the other side of the second roof panel in the short side direction and fitting with the recess, and a lid portion provided above the convex portion with a space therebetween and extending on the other side of the second roof panel in the short side direction to cover the step portion. The waterproof and airtight tape has an adhesive layer adhered to the upper surfaces of the first roof panel and the second roof panel, and an aluminum layer provided on the adhesive layer. The retaining fitting retains the first roof panel to the main roof.

Effect of the Invention

[0008] According to the present invention, when retaining the first roof panel to the main roof, it is possible to provide a retaining fitting and a roof structure that can easily improve the accuracy of screw positioning.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Embodiments for Carrying Out the Invention

[0010] Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. In the following description and drawings, common components are denoted by common reference numerals. Appropriate descriptions of the components denoted by common reference numerals will be omitted as appropriate.

[0011] FIG. 1 is a perspective view with a part broken away showing the configuration of the roof structure 10. FIG. 2 is a partially enlarged cross-sectional view of the roof structure 10. In the figures, the X-axis direction is the front-rear direction, the Y-axis direction orthogonal to the X-axis direction is the left-right direction, and the Z-axis direction orthogonal to the X-axis direction and the Y-axis direction is the up-down direction.

[0012] As shown in FIGS. 1 and 2, the roof structure 10 includes a first roof panel 11, a second roof panel 12, a waterproof and airtight tape 13, a waterproof and fireproof laminate 14, a foaming material 15, and a retaining fitting 16. In FIG. 1, with respect to the first roof panel 11, the second roof panel 12, the waterproof and airtight tape 13, and the urethane film 31, primer 32, and top coat 33, which will be described later and constitute the waterproof and fireproof laminate 14, are sequentially shifted to the right and shown.

[0013] The first roof panel 11 is provided on a plurality of purlins 18. In FIG. 1, two purlins 18 arranged at intervals in the left-right direction (Y-axis direction) are shown. FIG. 2 is a cross-sectional view of the roof structure 10 cut along the right purlin 18 among the two purlins 18 arranged at intervals in the left-right direction.

[0014] The main roof 18 is made of steel purlins or the like. The main roof 18 extends in the front-rear direction (X-axis direction). The main roof 18 is provided on a plurality of beams. The beams extend in the left-right direction. The beams are provided on columns (not shown). The columns extend in the up-down direction (Z-axis direction). The thickness of the main roof 18 is, for example, 2.3 mm or more.

[0015] The second roof panel 12 is provided on a plurality of main roofs 18 adjacent to the first roof panel 11. In this example, the second roof panel 12 is provided on the front side of the first roof panel 11.

[0016] Each of the first roof panel 11 and the second roof panel 12 extends in the left-right direction (Y-axis direction). Each of the first roof panel 11 and the second roof panel 12 is formed in a rectangular shape in plan view. In the first roof panel 11 and the second roof panel 12, the left-right direction is referred to as the longitudinal direction, and the front-rear direction (X-axis direction) is referred to as the short-side direction. The longitudinal direction may be referred to as the long-side direction. The short-side direction may be referred to as the short-side direction.

[0017] In the present embodiment, a plurality of first roof panels 11 are arranged in the left-right direction (Y-axis direction), and a plurality of second roof panels 12 are arranged in the left-right direction adjacent to the plurality of first roof panels 11.

[0018] Each of the first roof panel 11 and the second roof panel 12 has a heat insulating material 21 and two metal outer skins 22, 23 facing each other with the heat insulating material 21 interposed therebetween. The first roof panel 11 and the second roof panel 12 are excellent in fire resistance due to the heat insulating material 21 and the metal outer skins 22, 23. The first roof panel 11 and the second roof panel 12 are also referred to as heat insulating sandwich panels or heat insulating panels.

[0019] The heat insulating material 21 is composed of, for example, an inorganic heat insulating material, a foamed resin heat insulating material, etc. Examples of the inorganic heat insulating material include rock wool, glass wool, etc. Examples of the foamed resin heat insulating material include polystyrene foam, rigid urethane foam, polyisocyanurate foam, phenol foam, etc. The thickness of the heat insulating material 21 is, for example, 20 mm to 200 mm.

[0020] The metal outer skins 22 and 23 are composed of various steel plates such as, for example, galvanized steel sheets (registered trademark), painted hot-dip galvanized steel sheets, etc. The thickness of the metal outer skins 22 and 23 is, for example, 0.2 mm to 2 mm.

[0021] The waterproof and airtight tape 13 is provided along the gap 19 between the adjacent first roof panel 11 and second roof panel 12. The waterproof and airtight tape 13 extends in the left-right direction (Y-axis direction).

[0022] The waterproof and fireproof laminate 14 is provided so as to cover the first roof panel 11, the second roof panel 12, and the waterproof and airtight tape 13. The waterproof and fireproof laminate 14 has a urethane film 31, a primer 32, and a top coat 33.

[0023] The urethane film 31 is composed of a thermosetting urethane rubber-based coating film. The standard usage amount of the urethane film 31 is, for example, 2 kg / m 2 2. The urethane film 31 has self-extinguishing property, flame retardancy, and waterproof property.

[0024] The primer 32 is provided on the lower surface of the urethane film 31. The primer 32 is composed of a urethane resin-based primer. The standard usage amount of the primer 32 is, for example, 0.05 kg / m 2 2. The primer 32 adheres the urethane film 31 to the upper surfaces of the first roof panel 11, the second roof panel 12, and the waterproof and airtight tape 13.

[0025] The top coat 33 is provided on the upper surface of the urethane film 31. The top coat 33 is composed of an acrylic urethane finish paint. The standard usage amount of the top coat 33 is, for example, 0.2 kg / m 2 is. The top coat 33 is for protecting the urethane film 31 from ultraviolet rays.

[0026] The urethane film 31, the primer 32, and the top coat 33 that constitute the waterproof and fireproof laminate 14 are all formed by coating using a coating device such as a spray gun. Therefore, as shown in FIG. 2, the waterproof and fireproof laminate 14 can fill the step formed by the waterproof tape 13 and the metal outer skin 22 without any gaps. By forming the urethane film 31, the primer 32, and the top coat 33 by coating, the surface (upper surface) of the waterproof and fireproof laminate 14 becomes a flat surface. "Flat" includes not only the case of being completely flat but also the case of being substantially flat, that is, the case of being different within the scope not departing from the gist of the invention.

[0027] As shown in FIG. 2, the first roof panel 11 has a first fitting portion 41. The first fitting portion 41 is provided at one end of the first roof panel 11 in the short side direction (front-rear direction, X-axis direction). One side is the front side in the front-rear direction, and the other side is the rear side in the front-rear direction.

[0028] FIG. 3 is a cross-sectional view for explaining the configuration of the first fitting portion 41. As shown in FIG. 3, the first fitting portion 41 has a concave portion 42 and a stepped portion 43.

[0029] The concave portion 42 has a configuration recessed on the other side (rear side) in the short side direction of the first roof panel 11. The concave portion 42 has a bottom surface 42a, an upper tip surface 42b, a lower tip surface 42c, an upper inner wall surface 42d, a lower inner wall surface 42e, an upper surface 42f, and a lower surface 42g.

[0030] The bottom surface 42a is composed of a pair of folded-back portions where the ends of the metal outer skin 22 and the ends of the metal outer skin 23 are folded back toward the heat insulating material 21 side, and an exposed portion of the heat insulating material 21 exposed between the folded-back portions. In FIG. 3, the ends of the metal outer skin 22 and the ends of the metal outer skin 23 are folded back in an L shape. For the bottom surface 42a, one side surface of the L-shaped portion of the metal outer skin 22 and the surface of the exposed portion of the heat insulating material 21 are arranged on the same plane, and one side surface of the L-shaped portion of the metal outer skin 23 has a stepped shape arranged on one side (front side) of one side surface of the L-shaped portion of the metal outer skin 22 and the surface of the exposed portion of the heat insulating material 21. "The same" includes not only the case of being completely the same, but also the case of being substantially the same, that is, the case of being different within the scope not departing from the gist of the invention. The shape of the bottom surface 42a is not limited to the stepped shape, and may be a planar shape, a curved surface shape, or the like.

[0031] The upper tip surface 42b is above the bottom surface 42a and is arranged on one side of the bottom surface 42a. The lower tip surface 42c is below the bottom surface 42a and is arranged on one side of the bottom surface 42a. The lower tip surface 42c may be arranged on one side of the upper tip surface 42b. In other words, the upper tip surface 42b may be arranged on the other side of the lower tip surface 42c. By arranging the upper tip surface 42b on the other side of the lower tip surface 42c, it is possible to easily secure a gap for arranging the engaging portion 56 of the fixing fitting 16 described later.

[0032] The upper inner wall surface 42d connects the bottom surface 42a and the upper tip surface 42b. Specifically, one end of the upper inner wall surface 42d is connected to the lower end of the upper tip surface 42b, and the other end of the upper inner wall surface 42d is connected to the upper end of the bottom surface 4a.

[0033] The lower inner wall surface 42e connects the bottom surface 42a and the lower tip surface 42c. Specifically, one end of the lower inner wall surface 42e is connected to the upper end of the lower tip surface 42c, and the other end of the lower inner wall surface 42e is connected to the lower end of the bottom surface 42a. The upper inner wall surface 42d faces the lower inner wall surface 42e.

[0034] The upper surface 42f is disposed above the upper inner wall surface 42d. One end of the upper surface 42f is connected to the upper end of the upper front end surface 42b. The length of the upper surface 42f in the X-axis direction may be longer than the length of the upper inner wall surface 42d in the X-axis direction. That is, the other end of the upper surface 42f may be disposed on the other side of the bottom surface 42a connected to the other end of the upper inner wall surface 42d.

[0035] The lower surface 42g is disposed below the lower inner wall surface 42e. One end of the lower surface 42g is connected to the lower end of the lower front end surface 42c. The length of the lower surface 42g in the X-axis direction may be longer than the length of the upper surface 42f in the X-axis direction. That is, the other end of the lower surface 42g may be disposed on the other side of the other end of the upper surface 42f. The lower surface 42g extends to the other end of the first roof panel 11.

[0036] The stepped portion 43 is provided above the concave portion 42 and on the other side (rear side) in the short side direction of the first roof panel 11 than the bottom surface 42a of the concave portion 42. The stepped portion 43 has an upper surface 43a, a lower side surface 43b, and an upper side surface 43c. The upper surface 43a is disposed above the upper surface 42f of the concave portion 42. The lower side surface 43b extends downward from one end of the upper surface 43a. The lower side surface 43b connects the upper surface 43a of the stepped portion 43 and the upper surface 42f of the concave portion 42. The upper side surface 43c extends upward from the other end of the upper surface 43a.

[0037] The second roof panel 12 has a second fitting portion 45 that fits with the first fitting portion 41 (see FIG. 2). The second fitting portion 45 is provided at the end on the other side in the short side direction of the second roof panel 12.

[0038] FIG. 4 is a cross-sectional view for explaining the configuration of the second fitting portion 45. As shown in FIG. 4, the second fitting portion 45 has a convex portion 46 and a lid portion 47.

[0039] The convex portion 46 protrudes to the other side in the short side direction of the second roof panel 12 and fits with the concave portion 42 (see FIG. 2). The convex portion 46 has a tip surface 46a, an upper base end surface 46b, a lower base end surface 46c, an upper surface 46d, and a lower surface 46e.

[0040] The front end face 46a is, in FIG. 4, constituted by a pair of folded-back portions obtained by folding back the end portion of the metal outer skin 22 and the end portion of the metal outer skin 23 toward the heat insulating material 21 side. Although the heat insulating material 21 does not protrude between the folded-back portions of the front end face 46a, it may be made to protrude.

[0041] The upper base end face 46b is located above the front end face 46a and is disposed on one side of the front end face 46a. In FIG. 4, the upper base end face 46b is a curved surface that is recessed on one side. The upper base end face 46b is not limited to being a curved surface and may be a flat surface.

[0042] The lower base end face 46c is located below the front end face 46a and is disposed on one side of the front end face 46a. In FIG. 4, the lower base end face 46c is a flat surface. The lower base end face 46c is not limited to being a flat surface and may be a curved surface.

[0043] The upper surface 46d connects the front end face 46a and the upper base end face 46b. Specifically, one end of the upper surface 46d is connected to the lower end of the upper base end face 46b, and the other end of the upper surface 46d is connected to the upper end of the front end face 46a.

[0044] The lower surface 46e connects the front end face 46a and the lower base end face 46c. Specifically, one end of the lower surface 46e is connected to the upper end of the lower base end face 46c, and the other end of the lower surface 46e is connected to the lower end of the front end face 46a.

[0045] The lid portion 47 is provided above the convex portion 46 with a space therebetween and extends to the other side in the short side direction of the second roof panel 12 to cover the stepped portion 43. The lid portion 47 has a first lower surface 47a, a second lower surface 47b, and an upper side surface 47c.

[0046] The first lower surface 47a is provided on the other side of the second lower surface 47b. When the first fitting portion 41 and the second fitting portion 45 are fitted together, the first lower surface 47a faces the upper surface 43a of the stepped portion 43. The first lower surface 47a is a horizontal surface. The term "horizontal" includes not only the case where it is completely horizontal but also the case where it is substantially horizontal, that is, the case where it is different within the scope not departing from the gist of the invention.

[0047] The second bottom surface 47b connects the first bottom surface 47a and the upper base end surface 46b. Specifically, one end of the second bottom surface 47b is connected to the other end of the first bottom surface 47a, and the other end of the second bottom surface 47b is connected to the upper end of the upper base end surface 46b. The second bottom surface 47b is an inclined surface that slopes upward in the vertical direction (Z-axis direction) from the front side to the rear side in the front-rear direction (X-axis direction).

[0048] The upper side surface 47c extends upward from the other end of the first bottom surface 47a. When the first fitting portion 41 and the second fitting portion 45 are fitted, the upper side surface 43c of the first fitting portion 41 and the upper side surface 47c of the second fitting portion 45 face each other, and a gap portion 19 is formed between the upper side surface 43c and the upper side surface 47c.

[0049] When the first fitting portion 41 and the second fitting portion 45 are fitted, a space 61 (see FIG. 2) is defined by the upper surface 42f of the recess 42, the lower side surface 43b of the stepped portion 43, the upper base end surface 46b of the convex portion 46, the first bottom surface 47a and the second bottom surface 47b of the lid portion 47.

[0050] The waterproof and airtight tape 13 is attached to the upper surfaces of the first roof panel 11 and the second roof panel 12 so as to cover the gap portion 19 between the first fitting portion 41 and the second fitting portion 45 (see FIG. 2).

[0051] FIG. 5 is a cross-sectional view of the waterproof and airtight tape 13. As shown in FIG. 5, the waterproof and airtight tape 13 has an adhesive layer 51 and an aluminum layer 52.

[0052] The adhesive layer 51 is adhered to the upper surfaces of the first roof panel 11 and the second roof panel 12. The adhesive layer 51 is made of butyl rubber, acrylic rubber, or the like. The thickness of the adhesive layer 51 is 0.1 mm or more and 0.5 mm or less. The waterproof and airtight tape 13 is excellent in waterproof performance due to the thickness and adhesive force of the adhesive layer 51. The aluminum layer 52 is provided on the adhesive layer 51. The aluminum layer 52 is made of aluminum. The fitting shape of the conventional heat insulation panel was a simple shape, and since fire easily rose from below to above, tapes having a combustible adhesive layer such as butyl rubber and acrylic rubber could not be used. In the fitting shape of the first fitting portion 41 and the second fitting portion 45 of the present invention, since it is difficult for fire to rise, a tape having a combustible adhesive layer 51 can be used.

[0053] The width (length in the X-axis direction) of the waterproof and airtight tape 13 is set so that when the waterproof and airtight tape 13 is attached along the gap 19 between the first roof panel 11 and the second roof panel 12 to be fitted, an attachment margin of about 20 mm to 30 mm in the X-axis direction can be secured with respect to the upper surfaces of the adjacent first roof panel 11 and the second roof panel 12 via the gap 19. The width of the waterproof and airtight tape 13 is, for example, 75 mm.

[0054] FIG. 6 is an enlarged view of the recess 42 and the protrusion 46. As shown in FIG. 6, when the first fitting portion 41 and the second fitting portion 45 are fitted, a gap G1 is formed between the bottom surface 42a of the recess 42 and the tip surface 46a of the protrusion 46, a gap G2 is formed between the upper inner wall surface 42d of the recess 42 and the upper surface 46d of the protrusion 46, and a gap G3 is formed between the lower inner wall surface 42e of the recess 42 and the lower surface 46e of the protrusion 46. The gaps G1, G2, and G3 communicate with each other. In the present embodiment, the gaps G1, G2, and G3 are formed when the first fitting portion 41 and the second fitting portion 45 are fitted, but at least the gaps G1 and G2 may be formed. A foaming material 15 is disposed in the gap G1.

[0055] The foam material 15 is provided between the concave portion 42 and the convex portion 46. Specifically, the foam material 15 is disposed in the gap G1 between the bottom surface 42a of the concave portion 42 and the tip surface 46a of the convex portion 46. The foam material 15 is composed of, for example, expanded graphite or the like. Since the waterproofness and airtightness in the normal state are ensured by the waterproof and airtight tape 13, the foam material 15 does not have waterproofness and airtightness. Therefore, in the normal state, as shown in FIG. 6, there is a gap around the foam material 15, and it is not arranged so as to ensure waterproofness and airtightness.

[0056] FIG. 7 is an enlarged view showing a state in which the gaps G1, G2, and G3 between the concave portion 42 and the convex portion 46 are filled with the foam material 15. As shown in FIG. 7, the foam material 15 foams when heated by fire, fills the gaps G1, G2, and G3 between the concave portion 42 and the convex portion 46, and prevents the passage of fire. Since the gaps G1, G2, and G3 between the concave portion 42 and the convex portion 46 are portions where the resistance to the swelling of the foam material 15 is weak, the foamed foam material 15 enters. In addition to the vertical direction (Z-axis direction) where fire easily passes through, the foam material 15 is also filled in the front-rear direction (X-axis direction) and the left-right direction (Y-axis direction). Compared with the case where only the gap G1 is filled with the foam material 15, it becomes even more difficult for fire to pass through.

[0057] The fixing fitting 16 fixes the first roof panel 11 to the roof frame 18. The fixing fitting 16 is disposed corresponding to the roof frame 18 on the upper surface 42f of the concave portion 42 of the first roof panel 11 (see FIG. 1). FIG. 1 shows the fixing fitting 16 disposed corresponding to the left roof frame 18 among the two roof frames 18 arranged at intervals in the left-right direction (Y-axis direction). Although not shown in FIG. 1, the fixing fitting 16 is also disposed at a position corresponding to the right roof frame 18 among the two roof frames 18 arranged at intervals in the left-right direction.

[0058] FIG. 8 is an enlarged perspective view showing the configuration of the fixing fitting 16. The fixing fitting 16 shown in FIG. 8 is a fixing fitting disposed corresponding to the right roof frame 18 among the two roof frames 18 (see FIG. 1) arranged at intervals in the left-right direction (Y-axis direction).

[0059] The fixing fitting 16 includes a plate-like member 55, a catching portion 56, and a screw hole 57.

[0060] The plate-like member 55 is disposed above the recess 42 and on one side (front side) of the stepped portion 43 in the short-side direction (front-rear direction, X-axis direction) of the first roof panel 11. Specifically, the plate-like member 55 is disposed corresponding to the soffit 18 on the upper surface 42f of the recess 42. The plate-like member 55 is formed in a rectangular shape in plan view in this example, but may be formed in a circular shape, an elliptical shape, a polygonal shape, etc. in plan view.

[0061] The catching portion 56 is provided on the plate-like member 55 and is caught by the recess 42. The catching portion 56 is disposed along the longitudinal direction (left-right direction, Y-axis direction) of the first roof panel 11. The catching portion 56 is disposed in the gap between the upper front end surface 42b (see FIGS. 6 and 7) of the recess 42 and the upper base end surface 46b (see FIGS. 6 and 7) of the convex portion 46 and is caught by the upper front end surface 42b. By catching the catching portion 56 by the upper front end surface 42b, positioning of the fixing fitting 16 in the X-axis direction is performed. The catching portion 56 is formed in a rectangular shape in plan view in this example, but may be formed in a circular shape, an elliptical shape, a polygonal shape, etc. in plan view.

[0062] The catching portion 56 has a configuration bent with respect to the plate-like member 55. The catching portion 56 is provided at a right angle to the plate-like member 55 in this example. That is, the fixing fitting 16 is formed in an L shape. The catching portion 56 is not limited to being provided at a right angle to the plate-like member 55, and may be provided at an acute angle or an obtuse angle to the plate-like member 55.

[0063] The screw hole 57 penetrates the plate-like member 55 in its thickness direction. The thickness direction of the plate-like member 55 is the Z-axis direction. A screw 58 is inserted into the screw hole 57. By inserting and tightening the screw 58 into the screw hole 57, the first roof panel 11 can be attached to the soffit 18. The screw 58 penetrates the other side from the bottom surface 42a of the recess 42 (see FIG. 2).

[0064] In the width direction (Y-axis direction) of the main roof 18, the positioning of the screw holes 57 can be achieved simply by aligning the fastening fitting 16 with the main roof 18. Also, in the length direction (X-axis direction) of the main roof 18, since the engaging portion 56 is engaged with the concave portion 42, the distance from the engaged portion of the concave portion 42 to the screw hole 57 can be made constant. Therefore, when attaching the first roof panel 11 to the main roof 18, the positioning accuracy of the screws 58 can be easily improved.

[0065] Since the fastening fitting 16 is fixed to the first roof panel 11 in a planar manner, compared with the case of attaching the first roof panel 11 to the main roof 18 with a single screw, the fastening strength is improved and the wind pressure resistance is improved. In the example of FIG. 8, the number of screw holes 57 is four, but it is not limited to this, and one or more are sufficient. When there are a plurality of screw holes 57, the distance between the screw holes 57 becomes constant, and the positioning accuracy between the screws 58 is improved. For example, by arranging two screw holes 57 in the width direction (Y-axis direction) of the main roof 18, the strength of the attachment can be improved while properly positioning the screws 58.

[0066] The head 59 of the screw 58 is accommodated in the space 61 between the upper surface 42f of the concave portion 42 of the first roof panel 11, the first lower surface 47a and the second lower surface 47b of the lid portion 47 of the second roof panel 12, and is covered by the lid portion 47. Thereby, the upper surfaces of the first roof panel 11 and the second roof panel 12 become flat, the waterproof airtight tape 13 can be accurately attached, and the waterproof property is improved.

[0067] FIG. 9 is an enlarged perspective view showing another arrangement of the fastening fitting 16. As shown in FIG. 9, two main roofs 18 are arranged adjacent to each other in the left-right direction (Y-axis direction), the first roof panel 11 is provided for each main roof 18, and the fastening fitting 16 is provided in the concave portion 42 of each first roof panel 11.

[0068] The engaging portion 56 is arranged along the short side direction (front - rear direction, X - axis direction) of the first roof panel 11. The engaging portion 56 is engaged with the end faces in the left - right direction (Y - axis direction) of the recess 42. By engaging the engaging portion 56 with the end faces in the left - right direction of the recess 42, the positioning of the fastening fitting 16 in the Y - axis direction is performed.

[0069] Each fastening fitting 16 has its engaging portions 56 facing each other. Through each engaging portion 56, the end faces of adjacent first roof panels 11 are abutted against each other. Since the thickness of the engaging portion 56 is 2.3 mm, when the opposing engaging portions 56 come into contact, a space of about 5 mm can be ensured between the end faces of adjacent first roof panels 11. Conventionally, in order to ensure the space between the end faces of adjacent first roof panels 11, a plate - shaped member was separately prepared and sandwiched between adjacent first roof panels 11. However, by using the fastening fitting 16, the plate - shaped member becomes unnecessary. Also, the number of screw holes 57 of the fastening fitting 16 can be four (two arranged along the orthogonal part of the engaging portion 56 and the plate - shaped member 55, and another two). Thus, using the fastening fitting 16 having the same configuration, in both cases where the engaging portion 56 is arranged along the short side direction of the first roof panel 11 and where the engaging portion 56 is arranged along the long side direction of the first roof panel 11, the first roof panel 11 can be fastened to the roof base 18. Specifically, in the former case, two screw holes along the orthogonal part of the engaging portion 56 and the plate - shaped member 55 are used, and in the latter case, two screw holes along a direction perpendicular to the direction along the orthogonal part of the engaging portion 56 and the plate - shaped member 55 can be used. The fastening in the long side direction of the first roof panel 11 is also referred to as the fastening of the general part. The fastening in the short side direction of the first roof panel 11 is also referred to as the fastening of the abutting part.

[0070] As described above, the roof structure 10 includes a first roof panel 11 having a first fitting portion 41, a second roof panel 12 having a second fitting portion 45, and a waterproof and airtight tape 13 provided so as to cover a gap portion 19 between the first fitting portion 41 and the second fitting portion 45. The first roof panel 11 and the second roof panel 12 have a heat insulating material and two metal outer skins, and are excellent in fire resistance. The waterproof and airtight tape 13 has an adhesive layer 51 and an aluminum layer 52, and is excellent in waterproof performance due to the thickness and adhesive strength of the adhesive layer 51. Therefore, the roof structure 10 is excellent in fire resistance and waterproof performance.

[0071] A waterproof and fireproof laminate 14 is provided on the upper surface of the first roof panel 11, the upper surface of the second roof panel 12, and the upper surface of the waterproof and airtight tape 13 of the roof structure 10. The waterproof and fireproof laminate 14 has a urethane film 31, a primer 32, and a top coat 33. Since the urethane film 31, the primer 32, and the top coat 33 are all formed by coating, the step formed by the waterproof and airtight tape 13 and the metal outer skin 22 can be filled without a gap, and it is excellent in waterproof performance and fireproof performance. Therefore, the roof structure 10 further including the waterproof and fireproof laminate 14 is excellent in fire resistance, waterproof performance, and fireproof performance.

[0072] A foaming material 15 is provided between the concave portion 42 of the first fitting portion 41 and the convex portion 46 of the second fitting portion 45 in the roof structure 10. The foaming material 15 foams when heated by fire and fills the gap between the concave portion 42 and the convex portion 46. In addition to the vertical direction (Z-axis direction) where fire easily passes through, the foaming material 15 is also filled in the front-rear direction (X-axis direction) and the left-right direction (Y-axis direction), making it even more difficult for fire to pass through. Therefore, the roof structure 10 further including the foaming material 15 is even more excellent in fire resistance and fireproof performance.

[0073] The adhesive layer 51 of the waterproof and airtight tape 13 is made of butyl rubber. Since the fitting shape of the first fitting portion 41 and the second fitting portion 45 makes it difficult for fire to rise from below to above, it is possible to use the waterproof and airtight tape 13 having the adhesive layer 51 made of flammable butyl rubber.

[0074] The retaining fitting 16 includes a plate-like member 55 disposed above the recess 42 and on one side (front side) of the step portion 43 in the short side direction (front-rear direction, X-axis direction) of the first roof panel 11, a catching portion 56 provided on the plate-like member 55 and caught by the recess 42, and one or more screw holes 57 penetrating the plate-like member 55. By simply aligning the retaining fitting 16 with the roof 18, it is possible to easily align the screw holes 57 in the width direction (Y-axis direction) of the roof 18. Since the catching portion 56 is caught by the recess 42, the distance in the length direction (X-axis direction) of the roof 18 from the caught portion of the recess 42 to the screw holes 57 can be made constant. Therefore, the retaining fitting 16 can easily improve the accuracy of positioning the screw 58 when attaching the first roof panel 11 to the roof 18.

[0075] The catching portion 56 is arranged along the short side direction of the first roof panel 11 or along the long side direction of the first roof panel 11. Using the retaining fitting 16 having the same configuration, the first roof panel 11 can be attached to the roof 18 both when the catching portion 56 is arranged along the short side direction of the first roof panel 11 and when the catching portion 56 is arranged along the long side direction of the first roof panel 11.

[0076] By including the retaining fitting 16, the roof structure 10 can easily improve the accuracy of positioning the screw 58 when attaching the first roof panel 11 to the roof 18.

[0077] The present invention is not limited to the above-described embodiment, and can be appropriately modified without departing from the spirit of the present invention.

[0078] In the above embodiment, the first roof panel 11 has the first fitting portion 41 on one side, but is not limited thereto. The first roof panel 11 may have the first fitting portion 41 on one side and the second fitting portion 45 on the other side.

[0079] In the above embodiment, the second roof panel 12 has the second fitting portion 45 on the other side, but it is not limited to this. The second roof panel 12 may have the second fitting portion 45 on the other side and the first fitting portion 41 on one side.

[0080] In the above embodiment, the roof structure 10 includes the waterproof and fireproof laminated body 14 having a three-layer structure with the urethane film 31, the primer 32, and the top coat 33, but it is not limited to this. The primer 32 and the top coat 33 may be absent. That is, the roof structure 10 may include the urethane film 31 provided on the upper surfaces of the first roof panel 11, the second roof panel 12, and the waterproof and airtight tape 13. The urethane film 31 is formed by coating using a coating device such as a spray gun. Therefore, the urethane film 31 can fill the step formed by the waterproof and airtight tape 13 and the metal outer skin 22 without any gaps. Since the urethane film 31 is formed by coating, the surface (upper surface) of the urethane film 31 becomes a flat surface. The urethane film 31 formed by coating is adhered to the upper surfaces of the first roof panel 11, the second roof panel 12, and the waterproof and airtight tape 13.

[0081] In the above embodiment, the waterproof and fireproof laminated body 14 has a three-layer structure with the urethane film 31, the primer 32, and the top coat 33, but it is not limited to this. The primer 32 or the top coat 33 may be absent. When the primer 32 is absent, the waterproof and fireproof laminated body 14 has a two-layer structure with the urethane film 31 and the top coat 33. That is, the roof structure 10 may include the waterproof and fireproof laminated body 14 having the urethane film 31 provided on the upper surfaces of the first roof panel 11, the second roof panel 12, and the waterproof and airtight tape 13, and the top coat 33 provided on the upper surface of the urethane film 31. When the top coat 33 is absent, the waterproof and fireproof laminated body 14 has a two-layer structure with the urethane film 31 and the primer 32. That is, the roof structure 10 may include the waterproof and fireproof laminated body 14 having the urethane film 31 and the primer 32 provided on the lower surface of the urethane film 31 and bonding the urethane film 31 to the upper surfaces of the first roof panel 11, the second roof panel 12, and the waterproof and airtight tape 13.

Description of Symbols

[0082] 10 Roof structure 11 First roof panel 12 Second roof panel 13 Waterproof and airtight tape 14 Waterproof and fireproof laminate 15 Foam material 16 Fastening fitting 18 Main house 21 Heat insulation material 22, 23 Metal outer skin 31 Urethane film 32 Primer 33 Top coat 41 First fitting part 42 Concave part 43 Step part 45 Second fitting part 46 Convex part 47 Cover part 51 Adhesive layer 52 Aluminum layer 55 Plate-like member 56 Engaging part 57 Screw hole

Claims

Claim 1: A first roof panel provided on a plurality of main roofs and having a first fitting portion, a second roof panel provided on the plurality of main roofs adjacent to the first roof panel and having a second fitting portion that fits with the first fitting portion, a waterproof and airtight tape attached to the upper surfaces of the first roof panel and the second roof panel so as to cover a gap between the first fitting portion and the second fitting portion, and a fixing fitting for fixing the first roof panel to the main roof, wherein, each of the first roof panel and the second roof panel has a heat insulating material and two metal outer skins facing each other through the heat insulating material, the first fitting portion is provided at one end in the short side direction of the first roof panel, and has a recess recessed on the other side in the short side direction of the first roof panel and a step portion provided above the recess and on the other side in the short side direction of the first roof panel than the bottom surface of the recess, the second fitting portion is provided at the end on the other side in the short side direction of the second roof panel, and has a convex portion that protrudes on the other side in the short side direction of the second roof panel and fits with the recess, and a lid portion provided above the convex portion with a space therebetween and extending on the other side in the short side direction of the second roof panel to cover the step portion, the waterproof and airtight tape has an adhesive layer adhered to the upper surfaces of the first roof panel and the second roof panel and an aluminum layer provided on the adhesive layer, the fixing fitting includes, a plate-like member disposed above the recess and on one side of the step portion in the short side direction of the first roof panel, a catching portion provided on the plate-like member and caught in the recess, and a roof structure having one or more screw holes penetrating the plate-like member. Claim 2: The roof structure according to Claim 1, wherein the catching portion is arranged along the longitudinal direction of the first roof panel or along the short side direction of the first roof panel.

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