JP2026074835A - Roof structure - Google Patents

Abstract

[Problem] To provide a fastening bracket and roof structure that can easily improve the accuracy of screw positioning when fastening the first roof panel to the purlin.
[Solution] The fastening fitting 16 fastens the first roof panel 11 to the 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 direction and has a recess 42 recessed on the other side of the first roof panel 11 in the short direction and a stepped portion 43 provided above the recess 42 and on the other side of the first roof panel 11 in the short direction than the bottom surface of the recess 42. The fastening fitting 16 includes a plate-shaped member 55 positioned above the recess 42 and on one side of the stepped portion 43 in the short direction of the first roof panel 11, a retaining portion 56 provided on the plate-shaped member 55 that engages with the recess 42, and one or more screw holes 57 that penetrate the plate-shaped member 55.
[Selection Diagram] Figure 8

Description

This invention relates to fastening hardware and roof structures.

A roof structure in which multiple roof panels are connected is known (see, for example, Patent Document 1). Patent Document 1 discloses a flat roof in which insulating panels, as roof panels, are connected by fitting protrusions and recesses. The insulating panels are fastened to the building structure, such as purlins, by driving fasteners such as screws or nails from the top of the insulating panels to the building structure. The gaps between adjacent insulating panels are sealed with tape made of aluminum foil.

Japanese Patent Publication No. 2007-262698

The flat roof described in Patent Document 1 presents difficulties in positioning the fasteners when attaching the insulation panels to the building structure.

The present invention aims to provide a fastening bracket and roof structure that can easily improve the accuracy of screw positioning when fastening the first roof panel to the purlin.

The fastening fitting according to the present invention is a fastening fitting for fastening a roof structure to a purlin, the roof structure comprising 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, wherein each of the first and second roof panels has an insulating material and two metal outer shells facing each other via the insulating material, the first fitting portion is provided at one end of the first roof panel in the short direction, and has a recessed portion on the other side of the first roof panel in the short direction, and is provided above the recess and on the other side of the first roof panel in the short direction than the bottom surface of the recess The second fitting portion has a stepped portion and is provided at the other end of the second roof panel in the short direction. It has a protrusion that projects to the other side of the second roof panel in the short direction and engages with the recess, and a cover portion provided above the protrusion with a gap between them, extending to the other side of the second roof panel in the short direction and covering the stepped portion. The first fitting portion is provided above the recess and positioned to one side of the stepped portion in the short direction of the first roof panel. The first fitting portion includes a retaining portion provided on the plate-like member that engages with the recess, and one or more screw holes penetrating the plate-like member.

The roof structure according to the present invention comprises the fastening fittings described above, a first roof panel provided on a plurality of purlins and having a first fitting portion, a second roof panel provided on a plurality of purlins adjacent to the first roof panel and having a second fitting portion that fits with the first fitting portion, and a waterproof and airtight tape attached to the upper surface of the first roof panel and the upper surface of the second roof panel so as to cover the gap between the first fitting portion and the second fitting portion, each of the first roof panel and the second roof panel having an insulating material and two metal outer shells facing each other with respect to the insulating material, the first fitting portion is provided at one end of the first roof panel in the short direction, and the short direction of the first roof panel The first roof panel has a recessed portion on the other side and a stepped portion located above the recess and on the other side in the short direction of the first roof panel, beyond the bottom surface of the recess. The second fitting portion is provided at the other end of the second roof panel in the short direction and has a protrusion that projects outwards on the other side in the short direction of the second roof panel and fits into the recess, and a cover portion provided above the protrusion with a gap between them, extending to the other side in the short direction of the second roof panel and covering the stepped portion. The waterproof and airtight tape has an adhesive layer bonded to the upper surface of the first roof panel and the upper surface of the second roof panel, and an aluminum layer provided on the adhesive layer. The fastening hardware fastens the first roof panel to the purlin.

According to the present invention, it is possible to provide a fastening bracket and roof structure that can easily improve the accuracy of screw positioning when fastening the first roof panel to the purlin.

This is a partially broken perspective view showing the structure of the roof. This is a partially enlarged cross-sectional view of the roof structure. This is a cross-sectional view illustrating the configuration of the first mating portion. This is a cross-sectional view illustrating the configuration of the second mating portion. This is a cross-section of waterproof and airtight tape. This is an enlarged view of section A shown in Figure 2. This is an enlarged view showing the state in which the gap between the concave and convex parts is filled with foam material. This is an enlarged perspective view showing the configuration of the fastening hardware. This is an enlarged perspective view showing an alternative arrangement of the fasteners.

The embodiments for carrying out the present invention will be described below with reference to the drawings. In the following description and drawings, common components are denoted by the same reference numerals. Descriptions of components denoted by the same reference numerals will be omitted as appropriate.

Figure 1 is a partially broken perspective view showing the configuration of the roof structure 10. Figure 2 is a partially enlarged cross-sectional view of the roof structure 10. In the figures, the X-axis direction is the front-to-back direction, the Y-axis direction perpendicular to the X-axis direction is the left-to-right direction, and the Z-axis direction perpendicular to both the X-axis and Y-axis directions is the up-and-down direction.

As shown in Figures 1 and 2, the roof structure 10 comprises a first roof panel 11, a second roof panel 12, a waterproof and airtight tape 13, a waterproof and fireproof laminate 14, a foam material 15, and fastening hardware 16. In Figure 1, the second roof panel 12, the waterproof and airtight tape 13, and the urethane film 31, primer 32, and topcoat 33 constituting the waterproof and fireproof laminate 14 (described later) are shown sequentially shifted to the right relative to the first roof panel 11.

The first roof panel 11 is provided on multiple purlins 18. Figure 1 shows two purlins 18 spaced apart from each other in the left-right direction (Y-axis direction). Figure 2 is a cross-sectional view of the roof structure 10 cut along the rightmost purlin 18 of the two purlins 18 spaced apart from each other in the left-right direction.

The purlins 18 are made of steel rafters, etc. The purlins 18 extend in the front-to-back direction (X-axis direction). The purlins 18 are attached to multiple beams. The beams extend in the left-to-right direction. The beams are attached to columns (not shown). The columns extend in the up-and-down direction (Z-axis direction). The thickness of the purlins 18 is, for example, 2.3 mm or more.

The second roof panel 12 is installed adjacent to the first roof panel 11 on multiple purlins 18. In this example, the second roof panel 12 is installed in front of the first roof panel 11.

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-back direction (X-axis direction) is referred to as the short direction. The longitudinal direction may also be referred to as the long side direction. The short direction may also be referred to as the short side direction.

In this embodiment, multiple first roof panels 11 are arranged in the left-right direction (Y-axis direction), and multiple second roof panels 12 are arranged adjacent to the multiple first roof panels 11 in the left-right direction.

Each of the first roof panel 11 and the second roof panel 12 has an insulating material 21 and two metal outer shells 22 and 23 facing each other via the insulating material 21. The first roof panel 11 and the second roof panel 12 have excellent fire resistance due to the insulating material 21 and the metal outer shells 22 and 23. The first roof panel 11 and the second roof panel 12 are also referred to as insulating sandwich panels or insulating panels.

The insulation material 21 is composed of, for example, inorganic insulation material, foamed resin insulation material, etc. Examples of inorganic insulation materials include rock wool and glass wool. Examples of foamed resin insulation materials include polystyrene foam, rigid polyurethane foam, polyisocyanurate foam, and phenolic foam. The thickness of the insulation material 21 is, for example, 20 mm to 200 mm.

The metal outer shells 22 and 23 are made of various types of steel sheets, such as galvalume steel sheet (registered trademark) or painted hot-dip galvanized steel sheet. The thickness of the metal outer shells 22 and 23 is, for example, 0.2 mm to 2 mm.

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

The waterproof and fire-resistant laminate 14 is provided to cover the first roof panel 11, the second roof panel 12, and the waterproof and airtight tape 13. The waterproof and fire-resistant laminate 14 has a urethane film 31, a primer 32, and a topcoat 33.

The urethane film 31 is composed of a thermosetting urethane rubber coating. The standard usage amount of the urethane film 31 is, for example, 2 kg/ ^m² . The urethane film 31 has self-extinguishing, flame-retardant, and waterproof properties.

The primer 32 is provided on the underside of the urethane film 31. The primer 32 is composed of a urethane resin-based primer. The standard amount of primer 32 used is, for example, 0.05 kg/ ^m² . The primer 32 adheres the urethane film 31 to 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.

The topcoat 33 is applied to the upper surface of the urethane film 31. The topcoat 33 is composed of an acrylic urethane-based finishing paint. The standard amount of topcoat 33 used is, for example, 0.2 kg/ ^m² . The topcoat 33 is intended to protect the urethane film 31 from ultraviolet rays.

The urethane film 31, primer 32, and topcoat 33 constituting the waterproof and fire-resistant laminate 14 are all formed by application using a coating device such as a spray gun. Therefore, as shown in Figure 2, the waterproof and fire-resistant laminate 14 can seamlessly fill the gap formed by the waterproof and airtight tape 13 and the metal outer shell 22. Because the urethane film 31, primer 32, and topcoat 33 are formed by application, the surface (top surface) of the waterproof and fire-resistant laminate 14 becomes a flat surface. "Flat" includes not only cases where it is perfectly flat, but also cases where it is substantially flat, i.e., cases where it differs within the scope of the invention.

As shown in Figure 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.

Figure 3 is a cross-sectional view illustrating the configuration of the first fitting portion 41. As shown in Figure 3, the first fitting portion 41 has a recess 42 and a stepped portion 43.

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

The bottom surface 42a is composed of a pair of folded portions formed by folding the ends of the metal outer shell 22 and the metal outer shell 23 towards the insulation material 21, and an exposed portion of the insulation material 21 exposed between the folded portions. In Figure 3, the ends of the metal outer shell 22 and the metal outer shell 23 are folded in an L-shape. The bottom surface 42a has a stepped shape in which one side surface of the L-shaped portion of the metal outer shell 22 and the surface of the exposed portion of the insulation material 21 are arranged on the same plane, and one side surface of the L-shaped portion of the metal outer shell 23 is positioned one side (front) of the one side surface of the L-shaped portion of the metal outer shell 22 and the surface of the exposed portion of the insulation material 21. "Same" includes not only cases where they are completely identical, but also cases where they are substantially identical, i.e., cases where they differ within the scope of the invention. The shape of the bottom surface 42a is not limited to a stepped shape, but may also be a planar shape, a curved shape, etc.

The upper tip surface 42b is above the bottom surface 42a and positioned to one side of the bottom surface 42a. The lower tip surface 42c is below the bottom surface 42a and positioned to one side of the bottom surface 42a. The lower tip surface 42c may also be positioned to one side of the upper tip surface 42b. In other words, the upper tip surface 42b may be positioned to the other side of the lower tip surface 42c. By positioning the upper tip surface 42b to the other side of the lower tip surface 42c, it becomes easier to secure a gap for positioning the retaining portion 56 of the fastening fitting 16, which will be described later.

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

The lower inner wall surface 42e connects the bottom surface 42a and the lower front surface 42c. Specifically, one end of the lower inner wall surface 42e is connected to the upper end of the lower front 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.

The upper surface 42f is positioned above the upper inner wall surface 42d. One end of the upper surface 42f is connected to the upper end of the upper tip 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 positioned on the other side of the bottom surface 42a, which is connected to the other end of the upper inner wall surface 42d.

The lower surface 42g is positioned below the lower inner wall surface 42e. One end of the lower surface 42g is connected to the lower end of the lower tip 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 positioned 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.

The stepped portion 43 is located above the recess 42 and on the other side (rear side) of the first roof panel 11 in the short direction, relative to the bottom surface 42a of the recess 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 positioned above the upper surface 42f of the recess 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 to the upper surface 42f of the recess 42. The upper side surface 43c extends upward from the other end of the upper surface 43a.

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

Figure 4 is a cross-sectional view illustrating the configuration of the second fitting portion 45. As shown in Figure 4, the second fitting portion 45 has a protrusion 46 and a cover portion 47.

The protrusion 46 projects from the other side in the short direction of the second roof panel 12 and engages with the recess 42 (see Figure 2). The protrusion 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.

In Figure 4, the tip surface 46a is composed of a pair of folded portions formed by folding the ends of the metal outer shell 22 and the metal outer shell 23 towards the insulation material 21. While the insulation material 21 is not exposed between the folded portions of the tip surface 46a, it may be exposed.

The upper base end surface 46b is located above the tip surface 46a and positioned to one side of the tip surface 46a. In Figure 4, the upper base end surface 46b is a curved surface with a recess on one side. The upper base end surface 46b is not limited to being a curved surface; it may also be a flat surface.

The lower base end surface 46c is located below the tip end surface 46a and positioned to one side of the tip end surface 46a. In Figure 4, the lower base end surface 46c is a flat surface. However, the lower base end surface 46c is not limited to a flat surface; it may also be a curved surface.

The upper surface 46d connects the tip surface 46a and the upper base surface 46b. Specifically, one end of the upper surface 46d is connected to the lower end of the upper base surface 46b, and the other end of the upper surface 46d is connected to the upper end of the tip surface 46a.

The lower surface 46e connects the tip surface 46a and the lower base surface 46c. Specifically, one end of the lower surface 46e is connected to the upper end of the lower base surface 46c, and the other end of the lower surface 46e is connected to the lower end of the tip surface 46a.

The cover portion 47 is provided above the protrusion 46, with a gap between it and the protrusion 46, and extends to the other side in the short direction of the second roof panel 12, covering the stepped portion 43. The cover portion 47 has a first lower surface 47a, a second lower surface 47b, and an upper side surface 47c.

The first lower surface 47a is located 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. "Horizontal" includes not only cases where it is perfectly horizontal, but also cases where it is approximately horizontal, i.e., cases where it differs without departing from the spirit of the invention.

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

The upper side surface 47c extends upward from the other end of the first lower surface 47a. When the first fitting portion 41 and the second fitting portion 45 are fitted together, 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 19 is formed between the upper side surfaces 43c and 47c.

When the first fitting portion 41 and the second fitting portion 45 are fitted together, the space 61 (see Figure 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 protrusion 46, and the first lower surface 47a and second lower surface 47b of the cover portion 47.

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 19 between the first fitting portion 41 and the second fitting portion 45 (see Figure 2).

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

The adhesive layer 51 is bonded to the upper surface of the first roof panel 11 and the upper surface of the second roof panel 12. The adhesive layer 51 is made of butyl rubber, acrylic rubber, etc. The thickness of the adhesive layer 51 is 0.1 mm to 0.5 mm. The waterproof and airtight tape 13 has excellent waterproofing properties due to the thickness and adhesive strength of the adhesive layer 51. The aluminum layer 52 is provided on the adhesive layer 51. The aluminum layer 52 is made of aluminum. Conventional insulation panels have a simple fitting shape, making it easy for fire to rise from below, so tapes with flammable adhesive layers such as butyl rubber and acrylic rubber could not be used. In the fitting shape of the first fitting part 41 and the second fitting part 45 of the present invention, fire is less likely to rise, so tapes with a flammable adhesive layer 51 can be used.

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 applied along the gap 19 between the fitted first roof panel 11 and the second roof panel 12, a gap of approximately 20 mm to 30 mm is secured in the X-axis direction relative to the upper surfaces of the adjacent first roof panel 11 and second roof panel 12 across the gap 19. For example, the width of the waterproof and airtight tape 13 is 75 mm.

Figure 6 is an enlarged view of the recess 42 and the protrusion 46. As shown in Figure 6, when the first fitting portion 41 and the second fitting portion 45 are fitted together, 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. Gaps G1, G2, and G3 are in communication with each other. In this embodiment, gaps G1, G2, and G3 are formed when the first fitting portion 41 and the second fitting portion 45 are fitted together, but it is sufficient if at least gaps G1 and G2 are formed. A foam material 15 is placed in gap G1.

The foam material 15 is provided between the recess 42 and the protrusion 46. Specifically, the foam material 15 is positioned in the gap G1 between the bottom surface 42a of the recess 42 and the tip surface 46a of the protrusion 46. The foam material 15 is made of, for example, expanded graphite. Since waterproofing and airtightness are ensured by the waterproof and airtight tape 13 under normal conditions, the foam material 15 does not possess waterproofing or airtightness. Therefore, under normal conditions, as shown in Figure 6, there is a gap around the foam material 15, and it is not positioned in a way that ensures waterproofing and airtightness.

Figure 7 is an enlarged view showing the state in which the gaps G1, G2, and G3 between the recess 42 and the protrusion 46 are filled with the foam material 15. As shown in Figure 7, the foam material 15 expands when heated by fire, filling the gaps G1, G2, and G3 between the recess 42 and the protrusion 46 and preventing fire from passing through. Since the gaps G1, G2, and G3 between the recess 42 and the protrusion 46 are areas with weak resistance to the expansion of the foam material 15, the expanded foam material 15 fills into them. In addition to the vertical direction (Z-axis direction) where fire easily passes through, the foam material 15 is also filled in the front-back direction (X-axis direction) and the left-right direction (Y-axis direction), making it even more difficult for fire to pass through compared to the case where only the gap G1 is filled with the foam material 15.

The fastening bracket 16 fastens the first roof panel 11 to the purlin 18. The fastening bracket 16 is positioned on the upper surface 42f of the recess 42 of the first roof panel 11, corresponding to the purlin 18 (see Figure 1). Figure 1 shows a fastening bracket 16 positioned corresponding to the left purlin 18 of two purlins 18 spaced apart in the left-right direction (Y-axis direction). Although not shown in Figure 1, another fastening bracket 16 is also positioned corresponding to the right purlin 18 of the two purlins 18 spaced apart in the left-right direction.

Figure 8 is an enlarged perspective view showing the configuration of the fastening fitting 16. The fastening fitting 16 shown in Figure 8 is positioned corresponding to the rightmost of two purlins 18 (see Figure 1), which are spaced apart from each other in the left-right direction (Y-axis direction).

The fastening fitting 16 comprises a plate-shaped member 55, a retaining portion 56, and a screw hole 57.

The plate-like member 55 is positioned above the recess 42 and on one side (front) of the stepped portion 43 in the short-side direction (front-to-back direction, X-axis direction) of the first roof panel 11. Specifically, the plate-like member 55 is positioned on the upper surface 42f of the recess 42, corresponding to the purlin 18. In this example, the plate-like member 55 is formed in a rectangular shape in plan view, but it may be formed in a circular, elliptical, polygonal, or other shape in plan view.

The locking portion 56 is provided on the plate-shaped member 55 and engages with the recess 42. The locking portion 56 is positioned along the longitudinal direction (left-right direction, Y-axis direction) of the first roof panel 11. The locking portion 56 is positioned in the gap between the upper tip surface 42b of the recess 42 (see Figures 6 and 7) and the upper base end surface 46b of the convex portion 46 (see Figures 6 and 7), and engages with the upper tip surface 42b. The engagement of the locking portion 56 with the upper tip surface 42b positions the fastening bracket 16 in the X-axis direction. In this example, the locking portion 56 is formed in a rectangular shape in plan view, but it may be formed in a circular, elliptical, polygonal, or other shape in plan view.

The locking portion 56 has a structure that is bent relative to the plate-shaped member 55. In this example, the locking portion 56 is provided at a right angle to the plate-shaped member 55. That is, the fastening fitting 16 is formed in an L-shape. The locking portion 56 is not limited to being provided at a right angle to the plate-shaped member 55; it may also be provided at an acute or obtuse angle to the plate-shaped member 55.

The screw hole 57 penetrates the plate-shaped member 55 in its thickness direction. The thickness direction of the plate-shaped 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 purlin 18. The screw 58 penetrates beyond the bottom surface 42a of the recess 42 (see Figure 2).

Regarding the width direction (Y-axis direction) of the purlin 18, the screw holes 57 can be aligned simply by aligning the fastening bracket 16 with the purlin 18. Furthermore, regarding the length direction (X-axis direction) of the purlin 18, since the locking portion 56 is locked into the recess 42, the distance from the locked portion of the recess 42 to the screw hole 57 can be kept constant. Therefore, when fastening the first roof panel 11 to the purlin 18, the accuracy of the screw positioning 58 can be easily improved.

Since the fastening bracket 16 is fixed to the first roof panel 11 across its surface, the fastening strength and wind pressure resistance are improved compared to when the first roof panel 11 is fastened to the purlin 18 with a single screw. In the example shown in Figure 8, there are four screw holes 57, but this is not limited to four; one or more are sufficient. When there are multiple screw holes 57, the distance between them becomes constant, improving the accuracy of positioning between the screws 58. For example, by arranging two screw holes 57 in the width direction (Y-axis direction) of the purlin 18, the fastening strength can be improved while appropriately positioning the screws 58.

The head 59 of the screw 58 is housed in the space 61 between the upper surface 42f of the recess 42 of the first roof panel 11 and the first lower surface 47a and the second lower surface 47b of the lid 47 of the second roof panel 12, and is covered by the lid 47. This makes the upper surfaces of both the first roof panel 11 and the second roof panel 12 flat, allowing the waterproof and airtight tape 13 to be applied accurately, thereby improving waterproofing.

Figure 9 is an enlarged perspective view showing another arrangement of the fastening fittings 16. As shown in Figure 9, two purlins 18 are arranged adjacent to each other in the left-right direction (Y-axis direction), and a first roof panel 11 is provided for each purlin 18. Fastening fittings 16 are provided in the recesses 42 of each first roof panel 11.

The retaining portion 56 is positioned along the shorter side (front-to-back direction, X-axis direction) of the first roof panel 11. The retaining portion 56 engages with the left-to-right (Y-axis direction) end face of the recess 42. The engagement of the retaining portion 56 with the left-to-right end face of the recess 42 positions the fastening bracket 16 in the Y-axis direction.

Each fastening bracket 16 has its interlocking portion 56 facing each other. The end faces of adjacent first roof panels 11 are butted together via each interlocking portion 56. Since the thickness of the interlocking portion 56 is 2.3 mm, the contact between the opposing interlocking portions 56 ensures a gap of approximately 5 mm between the end faces of adjacent first roof panels 11. Conventionally, in order to ensure the gap between the end faces of adjacent first roof panels 11, a plate-shaped member was separately prepared to be sandwiched between adjacent first roof panels 11, but by using the fastening bracket 16, the plate-shaped member becomes unnecessary. In addition, the screw holes 57 of the fastening bracket 16 can be made into four (two sets of two holes arranged side by side along the perpendicular portion between the interlocking portion 56 and the plate-shaped member 55). This allows the first roof panel 11 to be fastened to the purlin 18 using the same fastening bracket 16, in both cases: when the locking portion 56 is positioned along the short side of the first roof panel 11, and when the locking portion 56 is positioned along the longitudinal side of the first roof panel 11. Specifically, in the former case, two screw holes are used along the perpendicular portion between the locking portion 56 and the plate-like member 55; in the latter case, two screw holes are used in a direction perpendicular to the direction along the perpendicular portion between the locking portion 56 and the plate-like member 55. Fastening in the longitudinal direction (long side direction) of the first roof panel 11 is also referred to as fastening of the general portion. Fastening in the short side direction (short side direction) of the first roof panel 11 is also referred to as fastening of the butt portion.

As described above, the roof structure 10 comprises 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 to cover the gap 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 insulation material and two metal outer layers, providing excellent fire resistance. The waterproof and airtight tape 13 has an adhesive layer 51 and an aluminum layer 52, and its waterproofness is excellent due to the thickness and adhesive strength of the adhesive layer 51. Therefore, the roof structure 10 has excellent fire resistance and waterproofness.

The roof structure 10 has a waterproof and fire-resistant laminate 14 provided on the upper surfaces of the first roof panel 11, the second roof panel 12, and the waterproof and airtight tape 13. The waterproof and fire-resistant laminate 14 comprises a urethane film 31, a primer 32, and a topcoat 33. Since the urethane film 31, primer 32, and topcoat 33 are all formed by coating, they can completely fill the gaps between the waterproof and airtight tape 13 and the metal outer shell 22, resulting in excellent waterproofing and fire resistance. Therefore, the roof structure 10 further comprising the waterproof and fire-resistant laminate 14 exhibits superior fire resistance, waterproofing, and fire resistance.

The roof structure 10 has a foam material 15 provided between the recess 42 of the first fitting part 41 and the protrusion 46 of the second fitting part 45. The foam material 15 expands when heated by fire, filling the gap between the recess 42 and the protrusion 46. In addition to the vertical direction (Z-axis direction), where fire easily penetrates, the foam material 15 also fills the front-to-back direction (X-axis direction) and the left-to-right direction (Y-axis direction), making it even more difficult for fire to penetrate. Therefore, the roof structure 10 further equipped with the foam material 15 offers even greater fire resistance and fire prevention.

The adhesive layer 51 of the waterproof and airtight tape 13 is made of butyl rubber. Because the fitting shape of the first fitting portion 41 and the second fitting portion 45 makes it difficult for fire to rise from below, the waterproof and airtight tape 13 equipped with an adhesive layer 51 made of flammable butyl rubber can be used.

The fastening bracket 16 comprises a plate-shaped member 55 positioned above the recess 42 and on one side (front side) of the stepped portion 43 in the short-side direction (front-to-back direction, X-axis direction) of the first roof panel 11; a retaining portion 56 provided on the plate-shaped member 55 that engages with the recess 42; and one or more screw holes 57 that penetrate the plate-shaped member 55. By simply aligning the fastening bracket 16 with the purlin 18, the alignment of the screw holes 57 in the width direction (Y-axis direction) of the purlin 18 can be easily performed. Because the retaining portion 56 engages with the recess 42, the distance from the engaged portion of the recess 42 to the screw hole 57 in the length direction (X-axis direction) of the purlin 18 can be kept constant. Therefore, the fastening bracket 16 can easily improve the accuracy of screw positioning when fastening the first roof panel 11 to the purlin 18.

The retaining portion 56 is positioned along the short side of the first roof panel 11, or along the longitudinal side of the first roof panel 11. Using the same fastening hardware 16, the first roof panel 11 can be fastened to the purlin 18 in both cases: when the retaining portion 56 is positioned along the short side of the first roof panel 11, and when the retaining portion 56 is positioned along the longitudinal side of the first roof panel 11.

The roof structure 10, by providing fastening brackets 16, makes it easy to improve the positioning accuracy of the screws 58 when fastening the first roof panel 11 to the purlin 18.

The present invention is not limited to the embodiments described above, and can be modified as appropriate without departing from the spirit of the invention.

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

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

The roof structure 10, in the above embodiment, comprises a three-layer waterproof and fire-resistant laminate 14 having a urethane film 31, a primer 32, and a topcoat 33, but is not limited to this. The primer 32 and topcoat 33 may be omitted. That is, the roof structure 10 may also comprise a urethane film 31 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. The urethane film 31 is formed by application using a coating device such as a spray gun. Therefore, the urethane film 31 can seamlessly fill the gaps formed by the waterproof and airtight tape 13 and the metal outer shell 22. Because the urethane film 31 is formed by application, its surface (upper surface) becomes a flat surface. The urethane film 31 formed by application is adhered to 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.

In the above embodiment, the waterproof and fireproof laminate 14 has a three-layer structure comprising a urethane film 31, a primer 32, and a topcoat 33, but is not limited to this. The primer 32 or the topcoat 33 may be omitted. If the primer 32 is absent, the waterproof and fireproof laminate 14 has a two-layer structure comprising a urethane film 31 and a topcoat 33. That is, the roof structure 10 may also include a waterproof and fireproof laminate 14 having a urethane film 31 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, and a topcoat 33 provided on the upper surface of the urethane film 31. If the topcoat 33 is absent, the waterproof and fireproof laminate 14 has a two-layer structure comprising a urethane film 31 and a primer 32. In other words, the roof structure 10 may also include a waterproof and fireproof laminate 14 having a urethane membrane 31 and a primer 32 provided on the lower surface of the urethane membrane 31, which adheres the urethane membrane 31 to 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.

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 hardware 18 Purlin 21 Insulation material 22, 23 Metal sheath 31 Urethane film 32 Primer 33 Topcoat 41 First fitting part 42 Recess 43 Step 45 Second fitting part 46 Protrusion 47 Cover part 51 Adhesive layer 52 Aluminum layer 55 Plate-shaped member 56 Locking part 57 Screw hole

Claims (3)

A fastening bracket for fastening a roof structure to a purlin, comprising 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,
Each of the first roof panel and the second roof panel has an insulating material and two metal outer shells facing each other with respect to the insulating material.
The first fitting portion is provided at one end of the first roof panel in the short direction, and has a recess that is recessed on the other side of the first roof panel in the short direction, and a stepped portion provided above the recess and on the other side of the first roof panel in the short direction, above the bottom surface of the recess.
The second fitting portion is provided at the other end of the second roof panel in the short direction and has a protrusion that projects to the other side of the second roof panel in the short direction and fits into the recess, and a cover portion provided above the protrusion with a gap between it and the protrusion, extending to the other side of the second roof panel in the short direction and covering the stepped portion.
A plate-shaped member positioned above the recess and on one side of the stepped portion in the short direction of the first roof panel,
A retaining portion is provided on the plate-shaped member and is engaged with the recess,
A fastening fitting comprising one or more screw holes penetrating the plate-shaped member. The fastening fitting according to claim 1, wherein the retaining portion is arranged along the longitudinal direction of the first roof panel, or along the short direction of the first roof panel. The fastening fitting according to claim 1 or 2,
A first roof panel having a first fitting portion is provided on multiple main buildings,
A second roof panel is provided adjacent to the first roof panel on a plurality of purlins and has a second fitting portion that fits with the first fitting portion,
The system includes a waterproof and airtight tape attached to the upper surface of the first roof panel and the upper surface of the second roof panel so as to cover the gap between the first fitting portion and the second fitting portion.
Each of the first roof panel and the second roof panel has an insulating material and two metal outer shells facing each other with respect to the insulating material.
The first fitting portion is provided at one end of the first roof panel in the short direction, and has a recess that is recessed on the other side of the first roof panel in the short direction, and a stepped portion provided above the recess and on the other side of the first roof panel in the short direction, above the bottom surface of the recess.
The second fitting portion is provided at the other end of the second roof panel in the short direction and has a protrusion that projects to the other side of the second roof panel in the short direction and fits into the recess, and a cover portion provided above the protrusion with a gap between it and the protrusion, extending to the other side of the second roof panel in the short direction and covering the stepped portion.
The waterproof and airtight tape has an adhesive layer adhered to the upper surface of the first roof panel and the upper surface of the second roof panel, and an aluminum layer provided on the adhesive layer.
The fastening hardware is a roof structure for fastening the first roof panel to the purlin.