Roof structure

Abstract

This roof structure eliminates the need for fire resistance certification, reduces construction labor, and allows for larger support spans than conventional structures. [Solution] The roof structure 1 according to this embodiment is a roof structure 1 in which an insulating layer 3 made of foamed plastic insulating material 31 is laminated on a deck plate 2, the foamed plastic insulating material 31 is provided in contact with the deck plate 2, and the foamed plastic insulating material 31 is a non-combustible material. The thickness H3 of the insulating layer 3 is more than 50 mm, and the waterproof sheet 4 laminated on the insulating layer 3 is a non-combustible material.

Description

Technical Field

[0001] This invention relates to a roof structure using a deck plate.

Background Art

[0002] When using a deck plate as a roof material for external heat insulation, based on the First and Third Articles of the Ministry of Construction Notice No. 1365 in 2000, the deck alone is "recognized by the Minister of Land, Infrastructure, Transport and Tourism" (hereinafter also referred to as fire resistance certification), and on this basis, the thickness of the heat insulation material is set to 50 mm or less for operation. If it is desired to provide a heat insulation material with a thickness exceeding 50 mm, it is necessary to separately obtain fire resistance certification for a composite structure. The fire resistance performance related to the ministerial certification of the roof fire resistance structure is determined by the "fire resistance performance test" of the roof conducted by a designated performance evaluation organization based on the provisions of Article 2, Paragraph 7 of the Building Standards Act. From the perspective of the pass / fail judgment criteria in this fire resistance performance test and the amount of burning species, it is necessary to sandwich a member such as plywood between the heat insulation material and the deck plate in order to prevent the temperature rise of the heat insulation material.

[0003] When obtaining fire resistance certification, it is necessary to construct under the specifications of the roof structure that has received the certification. Therefore, it is not possible to additionally place or hang objects on the roof structure that has received fire resistance certification, and construction is restricted. Therefore, for example, in order to additionally place a solar panel bracket or the like on a roof structure that has received fire resistance certification, a separate fire resistance certification is required.

[0004] In the roof structure of Patent Document 1, in a roof structure in which a field board, a heat insulation material, and a waterproof material are sequentially laminated on a deck plate fixed on a beam or a main roof, the field board is made of a hard wood wool cement board, and the heat insulation material has a thickness exceeding 50 mm.

[0005] However, in the disclosed technology of Patent Document 1, a wood wool cement board is sandwiched between the deck plate and the heat insulation material. For this reason, the material and labor costs increase, and it is also very laborious in terms of construction. In particular, since the wood wool cement board is heavy, it acts as a loading load on the deck plate, and the support span tends to be small.

Prior Art Documents

[0006] [Patent Document 1] Japanese Patent Publication No. 2016-928 [Overview of the project] [Problems that the invention aims to solve]

[0007] This invention was made in view of the above circumstances, and its purpose is to provide a roof structure that eliminates the need for fire resistance certification, reduces construction labor, and allows for a larger support span than conventional structures. [Means for solving the problem]

[0008] The roof structure according to the present invention is a roof structure in which an insulating layer made of foamed plastic insulating material is laminated on a deck plate, wherein the foamed plastic insulating material is provided in contact with the deck plate, and the foamed plastic insulating material is a non-combustible material. [Effects of the Invention]

[0009] According to this invention, fire resistance certification is not required, construction labor is reduced, and the support span can be made larger than before. In addition, since the specifications are not restricted by fire resistance certification, it becomes possible to place or suspend additional objects. [Brief explanation of the drawing]

[0010] [Figure 1] Figure 1 is a cross-sectional view showing a roof structure according to the first embodiment. [Figure 2] Figure 2 is a cross-sectional view showing a roof structure according to the second embodiment. [Figure 3] Figure 3 is a cross-sectional view showing a roof structure according to the third embodiment. [Figure 4] Figure 4 is a cross-sectional view showing a roof structure according to the fourth embodiment. [Figure 5]Figure 5 is a cross-sectional view showing the roof structure according to the fifth embodiment. [Figure 6] Figure 6 is a cross-sectional view showing a roof structure according to the sixth embodiment. [Modes for carrying out the invention]

[0011] Hereinafter, embodiments of this invention will be described with reference to the drawings.

[0012] (First Embodiment) As shown in Figure 1, the roof structure 1 comprises a deck plate 2, an insulation layer 3 made of foamed plastic insulation material 31, and a waterproof sheet 4. In the roof structure 1, the insulation layer 3 made of foamed plastic insulation material 31 and the waterproof sheet 4 are sequentially laminated on top of the deck plate 2.

[0013] The deck plate 2, the foamed plastic insulation material 31, and the waterproof sheet 4 are non-combustible materials. Non-combustible materials as used herein refer to non-combustible materials based on the provisions of Article 2, Item 9 of the Building Standards Act. For example, non-combustible materials are generally those that have been certified by the Minister of Land, Infrastructure, Transport and Tourism based on the performance evaluation of the "non-combustible performance test" of materials conducted by a designated performance evaluation organization. For example, a non-combustible material may be one that has been certified as such by the Minister of Land, Infrastructure, Transport and Tourism based on the performance evaluation conducted by a designated performance evaluation organization, which confirms that the furnace temperature does not rise by more than 20K from the final equilibrium temperature for 20 minutes after the start of heating, and that the mass does not decrease by more than 30% after the end of the test. However, any non-combustible material will be considered a non-combustible material under any non-combustible performance test conditions as long as it has been certified as such by the Minister of Land, Infrastructure, Transport and Tourism based on the performance evaluation conducted by a designated performance evaluation organization.

[0014] The deck plate 2 is formed in a corrugated cross-section. The deck plate 2 is constructed by bending a steel plate, and for example, Nippon Steel Roof Deck manufactured by Nippon Steel Construction Materials Co., Ltd. is used. The deck plate 2 is fixed to the beam member 9, which is made of H-shaped steel or the like, with fastening members such as screws. Multiple deck plates 2 are arranged in the width direction of the deck plate 2, and the deck plates 2 are connected to each other.

[0015] The deck plate 2 has an upper flange 21, a lower flange 22 disposed below the upper flange 21, and a web 23 connecting the upper flange 21 and the lower flange 22. At both ends in the width direction of the deck plate 2, there are connecting parts (not shown in the figure) for connecting to other adjacent deck plates 2. The adjacent flanges 21 are spaced apart from each other in the deck plate 2.

[0016] The foamed plastic heat insulating material 31 is provided in contact with the upper flange 21 of the deck plate 2.

[0017] The foamed plastic heat insulating material 31 uses a non-combustible material. The foamed plastic heat insulating material 31 may be, for example, a heat insulating material obtained by subjecting a heat insulating material such as a phenolic foam heat insulating material, a urethane foam heat insulating material, or a polystyrene foam heat insulating material serving as a core material to a non-combustible treatment.

[0018] The heat insulating layer 3 is constituted by, for example, laminating a plurality of rectangular parallelepiped foamed plastic heat insulating materials 31. The thickness H3 of the heat insulating layer 3 is not specified, but preferably it is more than 50 mm and 300 mm or less, and it may be 200 mm or less.

[0019] The waterproof sheet 4 uses a non-combustible material. The waterproof sheet 4 may be, for example, an asphalt-based waterproof sheet or a vinyl chloride resin-based waterproof sheet that has been subjected to a non-combustible treatment.

[0020] The thickness of the waterproof sheet 4 is preferably about 1.5 to 15 mm.

[0021] The roof structure 1 may be provided with screws 5 penetrating through the deck plate 2, the heat insulating layer 3, and the waterproof sheet 4. Thereby, the heat insulating layer 3 and the waterproof sheet 4 are fixed to the deck plate 2, and the mutual displacement thereof can be prevented. The screws 5 are driven in from the side of the waterproof sheet 4.

[0022] According to this embodiment, the foamed plastic insulation material 31 is provided in contact with the deck plate 2, the foamed plastic insulation material 31 is a non-combustible material, the thickness H3 of the insulation layer 3 is greater than 0 mm and about 300 mm, and the waterproof sheet 4 is a non-combustible material. Since the deck plate 2, insulation layer 3, and waterproof sheet 4 that constitute the roof structure 1 are made of non-combustible materials, the roof structure 1 falls under the category of "made of non-combustible materials" as stipulated in Article 1, Item 1 of Ministry of Construction Notification No. 1365 of 2000. For this reason, even if the thickness H3 of the insulation layer 3 exceeds 50 mm, fire resistance certification is not required. For this reason, additional loads such as solar panel mounting frames and ceiling suspension materials can be added to the roof structure 1. Therefore, the degree of freedom in constructing the roof structure 1 can be increased.

[0023] According to this embodiment, the foamed plastic insulation material 31 is provided in contact with the deck plate 2, and the foamed plastic insulation material 31 is made of a non-combustible material. In other words, in the roof structure 1, the wood wool cement board that was installed between the deck plate and the insulation material in conventional roof structures where the thickness of the insulation material exceeds 50 mm is omitted. Therefore, labor can be saved in the construction of the roof structure 1. In addition, since the wood wool cement board is omitted in the roof structure 1, the roof structure 1 can be made lighter, and the support span can be made larger than in conventional roof structures.

[0024] (Second Embodiment) Next, a second embodiment will be described. Detailed explanations of configurations similar to those described above will be omitted below.

[0025] In this embodiment, the deck plate 2 is a flat deck with a substantially flat upper surface, and for example, an SF deck manufactured by Nippon Steel Construction Materials Co., Ltd. is used. Multiple deck plates 2 are arranged in the width direction of the deck plate 2, and the deck plates 2 are connected to each other.

[0026] As shown in Figure 2, the deck plate 2 has three flanges 21 in contact with the foamed plastic insulation material 31, and three ribs 24 extending downward from the flanges 21. The deck plate 2 has adjacent flanges 21 in contact with each other, and the ribs 24 are connected to two flanges 21. The deck plate 2 has connecting portions 29 at both ends in the width direction for connecting to other adjacent deck plates 2.

[0027] In a cross-section perpendicular to the longitudinal direction of the deck plate 2, the rib 24 is formed of a portion extending vertically downward connected to the flange 21 and a portion formed in a triangular cross-section from this vertically downward extending portion. The deck plate 2 can improve its cross-sectional performance by having the rib 24.

[0028] (Third embodiment) Next, a third embodiment will be described.

[0029] In this embodiment, the deck plate 2 is a flat deck with a flat upper surface, for example, Across Deck (registered trademark) is used. Multiple deck plates 2 are arranged in the width direction of the deck plate 2, and the deck plates 2 are connected to each other.

[0030] As shown in Figure 3, the deck plate 2 has two flanges 21 that are in contact with the foamed plastic insulation material 31, and one rib 24 extending downward from the flanges 21. The adjacent flanges 21 of the deck plate 2 are in contact with each other, and the rib 24 is connected to the two flanges 21. The deck plate 2 has connecting portions 29 at both ends in the width direction for connecting to other adjacent deck plates 2.

[0031] In a cross-section perpendicular to the longitudinal direction of the deck plate 2, the rib 24 is formed of a portion extending vertically downward connected to the flange 21 and a portion formed in a triangular cross-section from this vertically downward extending portion. The deck plate 2 can improve its cross-sectional performance by having the rib 24.

[0032] (Fourth Embodiment) Next, a fourth embodiment will be described.

[0033] As shown in Figure 4, in the roof structure 1, screws 5 are omitted, and the deck plate 2, the insulation layer 3, and the waterproof sheet 4 are fixed to each other with adhesive. In addition, adjacent foamed plastic insulation materials 31 in the vertical and horizontal directions are also fixed to each other with adhesive.

[0034] The adhesive used in roof structure 1 is preferably a non-combustible material in accordance with Article 2, Item 9 of the Building Standards Act. The adhesive is, for example, one that has been certified as a non-combustible material by the Minister of Land, Infrastructure, Transport and Tourism based on the performance evaluation of the "non-combustible performance test" of the material conducted by a designated performance evaluation organization. However, since the adhesive used in roof structure 1 is only a small part of roof structure 1, it does not have to be a non-combustible material as long as it can fix the laminated deck plates 2, the insulation layer 3, and the waterproof sheet 4 to each other. Similarly, for the adhesive used to fix the foamed plastic insulation materials 31 to each other, a non-combustible material is preferable, but it does not have to be a non-combustible material as long as it can fix them to each other.

[0035] (Fifth embodiment) Next, a fifth embodiment will be described.

[0036] As shown in Figure 5, the insulation layer 3 may consist of a single layer of foamed plastic insulation material 31.

[0037] (Sixth Embodiment) Next, a sixth embodiment will be described.

[0038] As shown in Figure 6, multiple deck plates 2 are arranged side by side in the width direction of the deck plate 2, and the deck plates 2 are connected to each other. Both ends of the deck plate 2 in the width direction have connecting parts 29 for connecting to other adjacent deck plates 2.

[0039] The insulation layer 3 consists of multiple foamed plastic insulation materials 31 laid out side by side, forming butt joints 32 between adjacent foamed plastic insulation materials 31.

[0040] In the insulation layer 3, the connecting portion 29 and the butt joint 32 are offset in the width direction of the deck plate 2. In particular, it is preferable that the butt joint 32 of the foamed plastic insulation material 31 that are in contact with the deck plate 2 and the connecting portion 29 are offset in the width direction of the deck plate 2.

[0041] In the insulation layer 3, it is preferable that one butt joint 32 and the butt joint 32 above this one are offset from each other.

[0042] According to this embodiment, multiple deck plates 2 are arranged side by side in the width direction of the deck plate 2, each deck plate 2 has a connecting portion 29 for connecting with other adjacent deck plates 2, and the insulation layer 3 has butt joints 32 formed between multiple foamed plastic insulation materials 31 laid side by side, and the connecting portion 29 and the butt joints 32 are offset in the width direction of the deck plate 2. As a result, even if flames leak from the lower part of the connecting portion 29 of the deck plate 2, the leakage of flames from the butt joints 32 can be suppressed.

[0043] According to this embodiment, one butt joint 32 and the butt joint 32 above it are offset from each other. This makes it possible to suppress flame leakage from the butt joint 32 above the first butt joint 32, even if flames leak from the first butt joint 32.

[0044] While embodiments of these inventions have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. Furthermore, these embodiments can be combined as appropriate. Moreover, these inventions can be implemented in various novel forms in addition to the embodiments described above. Therefore, the above embodiments can be omitted, replaced, or modified in various ways without departing from the spirit of these inventions. Such novel forms and modifications are included in the scope and spirit of this invention, as well as in the claims and equivalents of the claims. [Explanation of Symbols]

[0045] 1: Roof structure 2: Deck Plate 3: Insulation layer 31: Foamed plastic insulation 4: Waterproof sheet 5: Bis 9: Beam material

Claims

1. A roof structure in which an insulating layer made of foamed plastic insulation material is laminated on top of a deck plate, The foamed plastic insulation material is provided in contact with the deck plate, The aforementioned foamed plastic insulation material is a non-combustible material. A roof structure characterized by the following.

2. The thickness of the aforementioned insulation layer is greater than 50 mm. The roof structure according to claim 1, characterized by the following:

3. The insulation layer is further equipped with a waterproof sheet laminated on top of the aforementioned insulation layer, The aforementioned waterproof sheet must be made of non-combustible material. The roof structure according to claim 1, characterized by the following:

4. The foamed plastic insulation material used is a phenolic foam insulation material that has been treated to be non-combustible. The roof structure according to claim 1, characterized by the following:

5. The aforementioned deck plates are arranged in a row in the width direction of the deck plate, The deck plate has a connecting portion for connecting with other adjacent deck plates, The aforementioned insulation layer has butt joints formed between multiple layers of foamed plastic insulation material laid side by side. The connecting portion and the butt joint are positioned offset from each other in the width direction of the deck plate. The roof structure according to claim 1, characterized by the following:

Images