Fire-resistant and airtight structures and fire-resistant buildings

Abstract

To provide a fireproof airtight structure and a fireproof building which enable formation of a continuous airtight line along an outer peripheral wall, while using a ventilation fireproof material having flexibility as a fireproof material covering peripheries of an outer peripheral beam and a non-outer peripheral beam.SOLUTION: A fireproof airtight structure includes: an outer peripheral beam extending along an outer peripheral wall; a non-outer peripheral beam joined to the outer peripheral beam; a first fireproof material which has a first ventilation fireproof material composed of a fibrous material at a position covering an indoor side of the outer peripheral beam and is made to cover the periphery of the outer peripheral beam; a second fireproof material which has a second ventilation fireproof material composed of a fibrous material and is made to cover the periphery of the non-outer peripheral beam; a first airtight material covering the indoor side of the first ventilation fireproof material; and a second airtight material which partitions between the first fireproof material and the second fireproof material or between the second fireproof materials, is covered with the second fireproof material and thereby is formed in the periphery of the non-outer peripheral beam, is arranged so as to block a ventilation passage extending in an extension direction, and is connected to the first airtight material.SELECTED DRAWING: Figure 4

Description

Technical Field

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[0001] The present invention relates to a fire-resistant airtight structure and a fire-resistant building.

Background Art

[0002] Conventionally, a fire-resistant building having a fire-resistant structure for the main structural part of a building has been known. Patent Document 1 discloses this type of fire-resistant building. In the fire-resistant structure of the fire-resistant building of Patent Document 1, an airtight fire-resistant coating material in which a sheet-like member having airtightness is attached to at least one surface of a fire-resistant coating material having flexibility and a predetermined thickness is integrated and covered around a beam.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the fire-resistant structure described in Patent Document 1, the surroundings of each of an outer peripheral beam extending along the outer peripheral wall of a building and a non-outer peripheral beam joined to the outer peripheral beam and extending from the outer peripheral beam toward the indoor side are covered with an airtight fire-resistant coating material. By using a fire-resistant coating material having flexibility, such as a fiber-based fire-resistant coating material, the followability to the shapes of columns, beams, etc. can be improved while being a dry construction method, and thus the workability can be enhanced. Further, when using a fiber-based fire-resistant coating material, the airtightness of the outer peripheral beam and the non-outer peripheral beam can be ensured by a sheet-like member having airtightness integrated on one surface thereof, as in the airtight fire-resistant coating material described in Patent Document 1.

[0005] However, when ensuring the airtightness of the entire building by using the airtight fire-resistant coating material described in Patent Document 1, it is necessary to cover all around the outer peripheral beam and the non-outer peripheral beam with the airtight fire-resistant coating material, and there is still room for improvement in workability.

[0006] The present invention aims to provide a fire-resistant and airtight structure and a fire-resistant building that can form a continuous airtight line along the outer wall while using a breathable fire-resistant material made of a fibrous material as a fire-resistant material covering the perimeter beams and non-perimeter beams. [Means for solving the problem]

[0007] A fire-resistant and airtight structure as a first aspect of the present invention is: (1) Exterior beams extending along the exterior wall, A non-perimeter beam is joined to the aforementioned perimeter beam and extends from the aforementioned perimeter beam toward the interior side, A first breathable fire-resistant material made of a fibrous material is provided at a position covering the indoor side of the outer perimeter beam, and the first fire-resistant material is covering the perimeter beam. A second breathable fire-resistant material made of a fibrous material is provided and covers the periphery of the non-peripheral beam, The first airtight material covers the indoor side of the first ventilated fire-resistant material, The fire-resistant and airtight structure comprises a second airtight material that is arranged to obstruct the ventilation passage extending in the extending direction, which is formed around the non-peripheral beam by partitioning between the first fire-resistant material and the second fire-resistant material, or between the second fire-resistant materials themselves, and is covered by the second fire-resistant material, and is connected to the first airtight material.

[0008] One embodiment of the present invention is a fire-resistant and airtight structure, (2) The second airtight material is a fire-resistant and airtight structure as described in (1) above, wherein the second airtight material is exposed from the second fire-resistant material and has a connecting portion that connects to the first airtight material.

[0009] One embodiment of the present invention is a fire-resistant and airtight structure, (3) The aforementioned first breathable fire-resistant material is On the indoor side of the aforementioned outer perimeter beam, there is a base portion that extends vertically, The non-peripheral beam comprises a projection that extends from the base portion along the extending direction of the non-peripheral beam, The first airtight material is positioned to cover the indoor side of the base portion of the first ventilated fire-resistant material. The second airtight material is interposed between the tip surface of the protrusion of the first ventilated fire-resistant material and the second fire-resistant material. The first airtight material and the second airtight material are connected by an airtight tape being applied across the indoor side of the first airtight material and the fire-resistant side of the second airtight material, as described in (1) or (2) above.

[0010] One embodiment of the present invention is a fire-resistant and airtight structure, (4) The non-peripheral beam has a recess extending in the direction of extension, The second airtight material includes a fitting portion that is housed and positioned in the recess of the non-peripheral beam, The fire-resistant and airtight structure according to any one of (1) to (3) above, comprising a heat-shielding material that covers at least a portion of the fitting portion of the second airtight material from at least one side in the extending direction of the non-peripheral beam.

[0011] A fire-resistant building as a second aspect of the present invention is: (5) A fire-resistant building having a fire-resistant and airtight structure as described in any one of (1) to (4) above. [Effects of the Invention]

[0012] According to the present invention, it is possible to provide a fire-resistant and airtight structure and a fire-resistant building that can form a continuous airtight line along the outer wall while using a breathable fire-resistant material made of a fibrous material as a fire-resistant material covering the perimeter beams and non-perimeter beams. [Brief explanation of the drawing]

[0013] [Figure 1] This figure shows fire-resistant coated perimeter beams and non-perimeter beams in a fire-resistant building as one embodiment of the present invention. [Figure 2]It is a figure showing the vicinity of an outer peripheral beam in a fireproof airtight structure as one embodiment of the present invention. [Figure 3] It is a figure showing the vicinity of a non-outer peripheral beam in a fireproof airtight structure as one embodiment of the present invention. [Figure 4] It is a figure showing the vicinity of a joint portion between an outer peripheral beam and a non-outer peripheral beam in a fireproof airtight structure as one embodiment of the present invention. [Figure 5] It is a figure showing details of a second airtight material in a fireproof airtight structure as one embodiment of the present invention. [Figure 6] It is a figure showing a state during construction before the indoor side of the first ventilation fireproof material shown in FIG. 4 is covered with the first airtight material. [Figure 7] It is a figure showing a state in which the first airtight material is arranged on the indoor side of the first ventilation fireproof material and the first airtight material and the second airtight material are connected, starting from the state shown in FIG. 6. [Figure 8] It is a figure showing a modified example of the configuration in the vicinity of the second airtight material shown in FIG. 5. [Figure 9] It is a figure showing a modified example of the fireproof airtight structure shown in FIG. 7. [Figure 10] It is a figure showing a modified example of the fireproof airtight structure shown in FIG. 7. [Figure 11] It is a figure showing a modified example of the fireproof airtight structure shown in FIG. 7.

Embodiments for Carrying Out the Invention

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

[0015] Figure 1 shows the perimeter beam 10 and non-perimeter beam 20 that are fire-resistant coated in a fire-resistant building 200 as one embodiment of the fire-resistant building according to the present invention. Figures 2 and 3 show a fire-resistant airtight structure 100 as one embodiment of the fire-resistant airtight structure according to the present invention in the fire-resistant building 200. Figure 2 shows the vicinity of the perimeter beam 10 in the fire-resistant airtight structure 100. Figure 2 is a cross-sectional view of the fire-resistant airtight structure 100 in a section perpendicular to the extending direction A of the perimeter beam 10. Figure 3 shows the vicinity of the non-perimeter beam 20 in the fire-resistant airtight structure 100. Figure 3 is a cross-sectional view of the fire-resistant airtight structure 100 in a section perpendicular to the extending direction B of the non-perimeter beam 20.

[0016] First, an overview of the fire-resistant building 200 of this embodiment will be described. The fire-resistant building 200 can be, for example, a two-story detached house with a steel frame. Such a fire-resistant building 200 comprises, for example, a foundation structure such as a reinforced concrete strip foundation supported on the ground, and a superstructure that has a frame made up of frame members such as column members and beam members and is supported by the foundation structure. The frame members that make up the frame can be pre-standardized members that are manufactured in a factory beforehand and then transported to the construction site for assembly. However, the fire-resistant building 200 may also be a wooden house constructed using so-called conventional construction methods. Furthermore, the fire-resistant building 200 is not limited to low-rise buildings of one or two stories, but may also be a mid-to-high-rise building with three or more floors. Moreover, the use of the fire-resistant building 200 is not limited to detached houses, but may also be apartment buildings, condominiums, or other multi-unit dwellings, or commercial buildings such as shops and offices.

[0017] The superstructure of this embodiment comprises a frame composed of a plurality of column members, a plurality of main beam members erected between these column members, and a secondary beam member erected between the plurality of main beam members; an outer perimeter wall 2 arranged on the outer perimeter of this frame; and a floor 3 supported by the main beam members and secondary beam members of the frame. Hereinafter, unless otherwise distinguished, the main beam members and secondary beam members will simply be referred to as "beam members."

[0018] The exterior side of the outer wall 2 is composed of connected exterior wall panels 2a as exterior cladding. On the interior side of the exterior wall panels 2a of the outer wall 2, insulation material 2b and interior cladding material 2c are arranged to form an insulation layer.

[0019] For example, a lightweight aerated concrete panel (hereinafter referred to as "ALC panel") can be used as the exterior wall panel 2a. In this embodiment, the exterior wall panel 2a is an ALC panel. By connecting this exterior wall panel 2a around the outer perimeter of the frame, the outer skin layer of the outer wall 2 can be formed.

[0020] Furthermore, as the insulation material 2b, in addition to panel-shaped insulation materials made of foamed resin-based materials such as phenolic foam, polystyrene foam, and urethane foam, fibrous insulation materials such as rock wool and glass wool can also be used. The insulation material 2b in this embodiment is a foamed resin-based panel-shaped airtight insulation material. By arranging this insulation material 2b on the indoor side of the exterior wall panel 2a, along the inner surface of the exterior wall panel 2a, an insulation layer can be formed on the outer wall 2. As the interior material 2c, for example, gypsum board can be used, and by connecting the interior material 2c to the indoor side of the outer perimeter of the frame, an inner skin layer can be formed.

[0021] Floor 3 includes a floor slab material 3a. The floor slab material 3a is erected on the beam members of the frame and supported by the beam members. For example, ALC panels can be used as the floor slab material 3a. In addition to the floor slab material 3a, floor 3 may also include, for example, ceiling interior material 3b that constitutes the ceiling surface of the lower floor, which is directly or indirectly attached to the floor slab material 3a, and floor interior material 3c such as flooring that constitutes the floor surface of the upper floor, which is laminated on the floor slab material 3a.

[0022] Furthermore, the roof of a fire-resistant building 200 may be a flat roof. While ALC panels may be used for the roof slab material constituting the flat roof, it is not limited to ALC panels. The roof slab material is also waterproofed by being covered with a waterproof sheet, for example, made of polyvinyl chloride resin. Additionally, the roof of a fire-resistant building 200 is not limited to a flat roof; it may also be a pitched roof using roofing materials such as slate.

[0023] In Fire-Resistant Buildings 200, the main structural components such as columns and beams are made of fire-resistant material. Here, "fire-resistant building" refers to a building that conforms to the conditions specified in Article 2, Paragraph 1, Item 9-2 of the Building Standards Act.

[0024] In the case of a fire-resistant building 200 having structural members such as columns and beams, as in this embodiment, it is common to apply fire-resistant coating to the structural members. When applying fire-resistant coating to structural members, one method is to attach a flexible fire-resistant coating material to the structural member in question. The flexible fire-resistant coating material is not particularly limited in terms of material or thickness, but is sufficient as long as it is made of a material that can exhibit sufficient flexibility and has a thickness that satisfies the fire resistance standards. Examples of such fire-resistant coating materials include fire-resistant coating materials made of fibrous materials that have a predetermined thickness and are composed of a large number of fibers (hereinafter sometimes referred to as "ventilated fire-resistant material"). Specifically, examples of ventilated fire-resistant materials include fire-resistant coating materials made of glass wool, rock wool, felt, ceramic fiber, acrylic fiber, etc. Ventilated fire-resistant materials have sufficient flexibility and can easily conform to the shape of the structural member and the shape of the attachment site around it, so they can be easily installed regardless of their shape. However, because breathable fire-resistant materials are composed of numerous fibers, they are breathable, allowing air to leak and making it difficult to prevent heat transfer through them, thus making it difficult to ensure airtightness of the fire-resistant coated area.

[0025] On the other hand, in order to achieve energy conservation, the framing members arranged along the outer wall 2 of the fire-resistant building 200 may be made airtight as well as fire-resistant to ensure the airtightness of the entire fire-resistant building 200. As mentioned above, ventilated fire-resistant material does not have airtightness and therefore does not contribute to ensuring the airtightness of the building. For this reason, when ventilated fire-resistant material is used for fireproofing the framing members arranged along the outer wall 2, it is necessary to further cover this ventilated fire-resistant material with an airtight material in order to ensure the airtightness of the framing members.

[0026] Here, as shown in Figure 1, when the framework members of a fire-resistant building 200 include an outer perimeter beam 10 as a main beam member extending along the outer perimeter wall 2, and a non-perimeter beam 20 as a secondary beam member joined to the outer perimeter beam 10 and extending inward from the outer perimeter beam 10, then, as shown in Figures 2 and 3, the outer perimeter beam 10 and the non-perimeter beam 20 each need to be fire-resistant coated with fire-resistant material. Hereinafter, the fire-resistant material covering the perimeter beam 10 will be referred to as the "first fire-resistant material 30". The fire-resistant material covering the non-perimeter beam 20 will be referred to as the "second fire-resistant material 40".

[0027] From the standpoint of ease of construction as described above, if at least the portion of the first fire-resistant material 30 that covers the indoor side of the outer perimeter beam 10 is made of a ventilated fire-resistant material that conforms well to the shape of the outer perimeter beam 10, then the airtightness of the outer perimeter beam 10 can be ensured by further covering the indoor side of this ventilated fire-resistant material with an airtight material. For the sake of explanation, the ventilated fire-resistant material in the first fire-resistant material 30 will be referred to as the "first ventilated fire-resistant material 31". The airtight material that covers this first ventilated fire-resistant material 31 will be referred to as the "first airtight material 50".

[0028] However, the first airtight material 50 covering the indoor side of the outer perimeter beam 10 is interrupted at the joint 80 (see Figure 1) between the outer perimeter beam 10 and the non-outer perimeter beam 20 by the intersection with the second fire-resistant material 40 covering the perimeter of the non-outer perimeter beam 20. In other words, the airtight line along the outer perimeter wall 2 is interrupted by the ventilation passage X that extends in the direction B of the non-outer perimeter beam 20, which is formed around the non-outer perimeter beam 20 by being covered with the second fire-resistant material 40. That is, if the second fire-resistant material 40 includes a ventilated fire-resistant material, the presence of the aforementioned ventilation passage X causes ventilation through the ventilated fire-resistant material of the second fire-resistant material 40, making it impossible to ensure the airtightness of the fire-resistant building 200. Therefore, in order to ensure the airtightness of the fire-resistant building 200, it is necessary to cover the portion of the second fire-resistant material 40 that is composed of a ventilated fire-resistant material with an airtight material. In other words, since an airtight gap occurs in the airtight line along the outer wall 2 at the above joint 80, airtight treatment is required not only for the outer beam 10 but also for all of the non-outer beams 20 on the indoor side. For the sake of explanation below, the ventilated fire-resistant material in the second fire-resistant material 40 that covers the perimeter of the non-outer beams 20 will be referred to as the "second ventilated fire-resistant material 41".

[0029] In contrast, the fire-resistant and airtight structure 100 of this embodiment is characterized in that, while the indoor side of the outer perimeter beam 10 is covered with the first ventilated fire-resistant material 31, and at least a portion of the perimeter of the non-perimeter beam 20 is covered with the second ventilated fire-resistant material 41, it is possible to form a continuous airtight line along the outer perimeter wall 2. The details of the fire-resistant and airtight structure 100 of this embodiment, which is applied to the outer perimeter beam 10 and the non-perimeter beam 20 as described above, will be explained below.

[0030] <Perimeter beam 10 and non-perimeter beam 20> As shown in Figures 1 to 3, the fire-resistant and airtight structure 100 includes an outer perimeter beam 10 and a non-perimeter beam 20. The outer perimeter beam 10 extends substantially horizontally along the outer perimeter wall 2. The non-perimeter beam 20 is joined to the outer perimeter beam 10 and extends substantially horizontally from the outer perimeter beam 10 toward the interior. In this embodiment, the extension direction B of the non-perimeter beam 20 is substantially perpendicular to the extension direction A of the outer perimeter beam 10, but the configuration is not limited to this. The non-perimeter beam 20 may extend in a direction inclined with respect to the extension direction A of the outer perimeter beam 10.

[0031] The joining structure of the joint 80 between the outer perimeter beam 10 and the non-outer perimeter beam 20 in this embodiment is not particularly limited. The outer perimeter beam 10 and the non-outer perimeter beam 20 may be joined, for example, by bolts via a joining fitting. In this embodiment, the outer perimeter beam 10 is made of an H-shaped steel having a web 10a and upper and lower flanges 10b and 10c, and the non-outer perimeter beam 20 is made of an H-shaped steel having a web 20a and upper and lower flanges 20b and 20c. The web 10a of the outer perimeter beam 10 and the web 20a of the non-outer perimeter beam 20 are joined by bolts via a joining fitting. Note that the outer perimeter beam 10 and the non-outer perimeter beam 20 are not limited to H-shaped steel, and may have other cross-sectional shapes, such as channel steel, C-shaped steel, I-shaped steel, angle (L-shaped) steel, T-shaped steel, etc. The width and depth dimensions of the outer perimeter beam 10 and the non-outer perimeter beam 20 can also be appropriately varied according to the structural design.

[0032] <1st refractory material 30> As shown in Figure 2, the fire-resistant and airtight structure 100 includes a first fire-resistant material 30. The first fire-resistant material 30 covers the perimeter beam 10. The first fire-resistant material 30 is further provided with a flexible first ventilated fire-resistant material 31 at a position that covers the indoor side of the perimeter beam 10.

[0033] Specifically, the first fire-resistant material 30 of this embodiment is composed of a first breathable fire-resistant material 31 made of a fibrous material that has fire resistance but not airtightness, and a first airtight fire-resistant material 32 that has both fire resistance and airtightness. In other words, the outer perimeter beam 10 is fire-resistant by being covered with the first breathable fire-resistant material 31 and the first airtight fire-resistant material 32 in a cross-sectional view perpendicular to its extending direction A.

[0034] Examples of the first breathable fire-resistant material 31 include fire-resistant coatings made of glass wool, rock wool, felt, ceramic fiber, or acrylic fiber.

[0035] The first ventilated fire-resistant material 31 covers the outer perimeter beam 10 from the vertical lower side of the outer perimeter beam 10 to the indoor side of the outer perimeter beam 10.

[0036] Examples of the first airtight fire-resistant material 32 include ALC panels, precast concrete (PC) panels, cast-in-place concrete, etc. The first airtight fire-resistant material 32 of this embodiment comprises a fire-resistant wall material 33 that covers the outdoor side of the outer perimeter beam 10 and a fire-resistant floor material 34 that covers the vertically upper side of the outer perimeter beam 10. The fire-resistant wall material 33 of this embodiment is made of ALC panels as the outer wall panel 2a of the outer perimeter wall 2, but it may be made of a different material from the outer wall panel 2a of the outer perimeter wall 2. Furthermore, the fire-resistant floor material 34 of this embodiment is made of ALC panels as the floor slab material 3a of the floor 3, but it may be made of a different material from the floor slab material 3a of the floor 3.

[0037] As described above, the outer perimeter beam 10 in this embodiment is fireproofed by a first ventilated fireproof material 31 and a fireproof wall material 33 and fireproof floor material 34 as the first airtight fireproof material 32. More specifically, in this embodiment, in a cross-sectional view perpendicular to the extending direction A of the outer perimeter beam 10, the fireproof wall material 33 covering the outdoor side surface of the outer perimeter beam 10 and the fireproof floor material 34 covering the vertically upper surface (top surface) of the outer perimeter beam 10 are arranged to be in contact. Also, in a cross-sectional view perpendicular to the extending direction A of the outer perimeter beam 10, the first ventilated fireproof material 31 is wrapped around the outer perimeter beam 10 from the vertically lower surface (bottom surface) of the outer perimeter beam 10 so as to cover the indoor side surface of the outer perimeter beam 10. Furthermore, the lower covering portion 31a of the first ventilated fire-resistant material 31, which covers the vertically lower side of the outer perimeter beam 10, has an outer end portion 31a1 that extends along the fire-resistant wall material 33 and is in contact with the inner surface of the fire-resistant wall material 33, which is the indoor side of the fire-resistant wall material 33, and is fixed to the fire-resistant wall material 33. In addition, the upper end portion 31b1 of the indoor covering portion 31b of the first ventilated fire-resistant material 31, which covers the indoor side of the outer perimeter beam 10, has an outer end portion 31b1 that extends along the fire-resistant floor material 34 and is in contact with the lower surface of the fire-resistant floor material 34, and is fixed to the fire-resistant floor material 34. The first ventilated fire-resistant material 31 and the fire-resistant wall material 33 may be fixed by fasteners such as nails or screws. The first ventilated fire-resistant material 31 and the fire-resistant floor material 34 may also be fixed by fasteners such as nails or screws. Thus, in this embodiment, the outer perimeter beam 10 is fire-resistant, as it is surrounded by a first ventilated fire-resistant material 31 and a fire-resistant wall material 33 and fire-resistant floor material 34 as the first airtight fire-resistant material 32, in a cross-sectional view perpendicular to its extending direction A.

[0038] As described above, the first fire-resistant material 30 of this embodiment comprises a first ventilated fire-resistant material 31 and a first airtight fire-resistant material 32, but is not limited to this configuration. The first fire-resistant material 30 covers the perimeter of the outer beam 10, and may be configured to include at least a first ventilated fire-resistant material 31 made of a fibrous material in a position that covers the indoor side of the outer beam 10. Therefore, the first fire-resistant material 30 is not limited to the indoor side of the outer beam 10, for example, but may be composed of a first ventilated fire-resistant material 31 that covers the entire perimeter of the outer beam 10. Furthermore, the first airtight fire-resistant material 32 of this embodiment comprises a fire-resistant wall material 33 and a fire-resistant floor material 34, but may include another member in addition to or instead of the fire-resistant wall material 33 and fire-resistant floor material 34. For example, if there is a gap between the fire-resistant wall material 33 and the fire-resistant floor material 34 which constitute the first airtight fire-resistant material 32, the first airtight fire-resistant material 32 made of another member may be inserted or filled into this gap.

[0039] <Second refractory material 40> As shown in Figure 3, the fire-resistant and airtight structure 100 includes a second fire-resistant material 40. As shown in Figure 3, the second fire-resistant material 40 covers the perimeter of the non-perimeter beams 20. The second fire-resistant material 40 is further equipped with a flexible second ventilated fire-resistant material 41.

[0040] Specifically, the second fire-resistant material 40 of this embodiment is composed of a second breathable fire-resistant material 41 made of a fibrous material that has fire resistance but not airtightness, and a second airtight fire-resistant material 42 that has both fire resistance and airtightness. In other words, the non-perimeter beam 20 is fire-resistant by being covered with the second breathable fire-resistant material 41 and the second airtight fire-resistant material 42 in a cross-sectional view perpendicular to its extending direction B.

[0041] Examples of the second breathable fire-resistant material 41 include fire-resistant coatings made of glass wool, rock wool, felt, ceramic fiber, acrylic fiber, etc.

[0042] In this embodiment, the second ventilated fire-resistant material 41 covers both sides of the non-perimeter beam 20 and the vertically lower surface (bottom surface) of the non-perimeter beam 20.

[0043] Examples of the second airtight fire-resistant material 42 include ALC panels, PC panels, and cast-in-place concrete. The second airtight fire-resistant material 42 in this embodiment includes a fire-resistant floor material 34 that covers the vertically upper side of the non-perimeter beam 20. The fire-resistant floor material 34 in this embodiment is made of ALC panels as the floor slab material 3a of the floor 3, but it may be made of a different material from the floor slab material 3a in the floor 3.

[0044] As described above, the non-perimeter beam 20 of this embodiment is fire-resistant coated with a second ventilated fire-resistant material 41 and a fire-resistant floor material 34 as a second airtight fire-resistant material 42. More specifically, in this embodiment, in a cross-sectional view perpendicular to the extending direction B of the non-perimeter beam 20, the second ventilated fire-resistant material 41 is wrapped around the non-perimeter beam 20 so as to cover one side surface of the non-perimeter beam 20, the bottom surface of the non-perimeter beam 20, and the other side surface of the non-perimeter beam 20. In other words, the second ventilated fire-resistant material 41 of this embodiment comprises a bottom covering portion 41a that covers the vertically lower side of the non-perimeter beam 20, and side covering portions 41b and 41c that cover both sides of the non-perimeter beam 20, respectively. Furthermore, the upper ends 41b1 and 41c1 of the side covering portions 41b and 41c of the second ventilated fire-resistant material 41, which cover both sides of the non-perimeter beam 20, are fixed to the fire-resistant floor material 34 in a state where they are in contact with the lower surface of the fire-resistant floor material 34. The second ventilated fire-resistant material 41 and the fire-resistant floor material 34 may be fixed by fastening members such as nails and screws. In this way, the non-perimeter beam 20 of this embodiment is fire-resistant covered by being surrounded by the second ventilated fire-resistant material 41 and the fire-resistant floor material 34 as the second airtight fire-resistant material 42 in a cross-sectional view perpendicular to its extending direction B.

[0045] As described above, the second fire-resistant material 30 of this embodiment comprises a second ventilated fire-resistant material 41 and a second airtight fire-resistant material 42, but is not limited to this configuration. The second fire-resistant material 40 covers the periphery of the non-peripheral beam 20 and may have at least a second ventilated fire-resistant material 41 made of a fibrous material in a part of it. Therefore, the second fire-resistant material 40 may be composed of, for example, a second ventilated fire-resistant material 41 that covers the entire periphery of the non-peripheral beam 20. In addition, the second airtight fire-resistant material 42 of this embodiment comprises a fire-resistant floor material 34, but may also comprise another member in addition to or instead of the fire-resistant floor material 34. For example, if the fire-resistant floor material 34, which serves as the second airtight fire-resistant material 42, is divided vertically above the non-peripheral beam 20, and there is a gap there, the second airtight fire-resistant material 42, which is made of another member, may be inserted or filled into this gap.

[0046] <First airtight material 50> As shown in Figure 2, the fire-resistant and airtight structure 100 includes a first airtight material 50. The first airtight material 50 covers the first ventilated fire-resistant material 31. As described above, the first ventilated fire-resistant material 31 covers at least the indoor side of the outer perimeter beam 10. Therefore, the first airtight material 50 covers at least the area further indoor of the first ventilated fire-resistant material 31 that covers the indoor side of the outer perimeter beam 10. However, as described above, the first ventilated fire-resistant material 31 in this embodiment includes a lower covering portion 31a that covers the lower vertical side of the outer perimeter beam 10 and an indoor covering portion 31b that covers the indoor side of the outer perimeter beam 10. Therefore, the first airtight material 50 in this embodiment covers the first ventilated fire-resistant material 31 from the lower covering portion 31a to the indoor covering portion 31b. More specifically, the first airtight seal 50 in this embodiment covers the entire area of ​​the lower covering portion 31a and the entire area of ​​the indoor covering portion 31b. The lower end portion 50a of the first airtight seal 50 that covers the indoor side of the end portion 31a1 of the lower covering portion 31a may be connected to, for example, the fire-resistant wall material 33. However, in this embodiment, an insulating material 2b made of a foamed resin-based airtight insulating material is placed on the indoor side of the exterior wall panel 2a, which is the fire-resistant wall material 33, and the airtight line of the outer wall 2 is formed on the indoor side surface of this insulating material 2b. Therefore, in this embodiment, the lower end portion 50a of the first airtight seal 50 that covers the indoor side of the end portion 31a1 of the lower covering portion 31a is connected to the insulating material 2b. The first airtight seal 50 and the insulating material 2b are connected, for example, by airtight tape, so that the airtight line is continuous. Furthermore, the upper end 50b of the first airtight material 50, which covers the upper end 31b1 of the indoor covering portion 31b, is connected to the fire-resistant floor material 34. The first airtight material 50 and the fire-resistant floor material 34 are connected, for example, by airtight tape, so that the airtight line is continuous. In this way, the first airtight material 50 connects the insulation material 2b of the outer perimeter wall 2 and the fire-resistant floor material 34 so that the airtight line along the outer perimeter wall 2 is not interrupted vertically at the position of the outer perimeter beam 10 in the vertical direction.

[0047] The first airtight material 50 is not particularly limited as long as it has airtight properties. Therefore, the material and thickness of the first airtight material 50 are not particularly limited as long as it has sufficient airtightness. Examples of such first airtight material 50 include synthetic resin sheets, sheets such as metal foil containing aluminum, etc. If the first airtight material 50 is made of such an airtight sheet, the first airtight material 50 may be attached to the first ventilated fire-resistant material 31 in advance to form an integrated structure. Alternatively, the first airtight material 50 may be a foamed resin-based airtight insulation material such as phenolic foam, polystyrene foam, or urethane foam. In this embodiment, the first airtight material 50 is made of a foamed resin-based airtight insulation material. By using a foamed resin-based airtight insulation material for the first airtight material 50, it is possible to improve both airtightness and thermal insulation.

[0048] As shown in Figure 2, the first airtight seal 50 is constructed by connecting multiple airtight seal pieces. Adjacent airtight seal pieces are connected to each other, for example, by airtight tape, so as not to create gaps.

[0049] <Second airtight seal 60> Figure 4 shows the vicinity of the joint 80 between the outer perimeter beam 10 and the non-outer perimeter beam 20 of the fire-resistant and airtight structure 100. As shown in Figure 4, the fire-resistant and airtight structure 100 includes a second airtight material 60. The second airtight material 60 is positioned to block the ventilation passage X that extends in the direction of extension B of the non-outer perimeter beam 20 and is formed around the non-outer perimeter beam 20 by being covered with the second fire-resistant material 40. Here, "ventilation passage X" means not only the air gap between the second fire-resistant material 40 and the non-outer perimeter beam 20, but also the interior of the second ventilated fire-resistant material 41 in the second fire-resistant material 40. The second airtight material 60 is connected to the first airtight material 50. The first airtight material 50 and the second airtight material 60 are connected so that an airtight line is continuous, for example by an airtight tape Y1 (see Figure 7).

[0050] By providing such a second airtight material 60, even if the second ventilated fire-resistant material 41 is used on at least a portion of the second fire-resistant material 40, the ventilation passage X is blocked by the second airtight material 60. Therefore, in the extending direction B, on the indoor side of the second airtight material 60 (away from the outer perimeter beam 10), airtight sealing of the second ventilated fire-resistant material 41 with an airtight material becomes unnecessary. For example, even if a fire-resistant coating using the second ventilated fire-resistant material 41 is applied over the entire area of ​​the non-outer perimeter beam 20 in the extending direction B, airtight sealing only needs to be performed on the portion of the non-outer perimeter beam 20 on the outer perimeter beam 10 side of the second airtight material 60 in the extending direction B. In other words, the area requiring airtight sealing for the non-outer perimeter beam 20 can be narrowed, thereby reducing labor and costs. In particular, by placing the second airtight material 60 near the joint 80 between the outer perimeter beam 10 and the non-perimeter beam 20, airtight sealing can be made unnecessary over most of the extension direction B of the non-perimeter beam 20, and it becomes easier to achieve an airtight line along the outer perimeter wall 2 even at the location of the joint 80 between the outer perimeter beam 10 and the non-perimeter beam 20. Specifically, in this embodiment, as shown in Figure 4, the second ventilated fire-resistant material 41 of the second fire-resistant material 40 is not covered with an airtight material.

[0051] The second airtight material 60 is not particularly limited as long as it has sufficient airtightness. Therefore, the material, shape, thickness, and other dimensions of the second airtight material 60 are not particularly limited as long as it has sufficient airtightness. Examples of such a second airtight material 60 include synthetic resin boards, metal boards containing aluminum, and plastic boards. The second airtight material 60 may also be a foamed resin-based airtight insulation material such as phenolic foam, polystyrene foam, or urethane foam. When the second airtight material 60 is made of a foamed resin-based airtight insulation material, the insulation performance can be improved in addition to the airtightness.

[0052] The second airtight material 60 may be positioned near the joint 80 of the outer perimeter beam 10 and the non-outer perimeter beam 20 so as to separate the first fire-resistant material 30 and the second fire-resistant material 40. As an example, the second airtight material 60 may be positioned so as to separate the first ventilated fire-resistant material 31 of the first fire-resistant material 30 and the second ventilated fire-resistant material 41 of the second fire-resistant material 40. Alternatively, the second airtight material 60 may be positioned so as to separate the second fire-resistant materials 40 from each other in the extending direction B of the non-outer perimeter beam 20. As an example, the second airtight material 60 may be positioned so as to separate the second ventilated fire-resistant materials 41 from each other in the extending direction B of the non-outer perimeter beam 20. In this embodiment, the second airtight material 60 is positioned so as to separate the first ventilated fire-resistant material 31 of the first fire-resistant material 30 and the second ventilated fire-resistant material 41 of the second fire-resistant material 40. Details of this arrangement will be described later (see Figure 6).

[0053] Thus, the second airtight material 60 is positioned to partition the space between the first fire-resistant material 30 and the second fire-resistant material 40, or between the second fire-resistant materials 40 in the extending direction B of the non-perimeter beam 20, without impairing the fire resistance of the fire-resistant airtight structure 100, thereby blocking the ventilation passage X. Based on this role of the second airtight material 60, in addition to airtightness, it is preferable that the second airtight material 60 be made of a flame-retardant material, a semi-noncombustible material, a noncombustible material, or another material having noncombustibility or fire resistance, in order to enhance the continuity of the fire-resistant coating at the joints between the first fire-resistant material 30 and the second fire-resistant material 40, or between the second fire-resistant materials 40 in the extending direction B of the non-perimeter beam 20. Examples of such a second airtight material 60 include flame-retardant plastic sheets, metal sheets, gypsum boards, cement boards, calcium silicate boards, etc.

[0054] The second airtight material 60 may be held in place by the non-perimeter beam 20. Figure 5 shows details of the second airtight material 60 in this embodiment. In Figure 5, for the sake of explanation, the second fire-resistant material 40 is not shown. As shown in Figure 5, the second airtight material 60 comprises a fitting portion 61 that is housed in a recess 21 of the non-perimeter beam 20 extending in the extending direction B, and an outer edge portion 62 that covers the fitting portion 61 and the perimeter beam 20. In this embodiment, the non-perimeter beam 20 is an H-shaped steel, and the recess 21 of the non-perimeter beam 20 means a groove surrounded by the web 20a and the upper and lower flanges 20b, 20c. Therefore, the fitting portion 61 in this embodiment is fitted into the groove, which serves as the recess 21 of the non-perimeter beam 20, so that it is housed in this groove. The fitting portion 61 is fitted into the groove, which serves as the recess 21, on both sides of the non-perimeter beam 20, which is made of H-shaped steel. The outer edge portion 62 of this embodiment covers the sides and bottom of the non-peripheral beam 20 around the fitting portion 61. Specifically, the outer edge portion 62 of this embodiment includes a bottom covering portion 62a that covers the bottom of the non-peripheral beam 20, and side covering portions 62b and 62c that cover both sides of the non-peripheral beam 20 where the recess 21 that accommodates the fitting portion 61 is formed. The side covering portions 62b and 62c may be joined to the fitting portion 61 by adhesive or the like. Also, as shown in Figure 5, the outer edge portion 62 of this embodiment may be composed of two divided pieces separated at the position of the bottom covering portion 62a. The two divided pieces constituting the outer edge portion 62 may be joined by adhesive or the like to the end faces of the bottom covering portion 62a of each divided piece. Note that the portion of the second airtight material 60 adjacent to the non-peripheral beam 20 is airtightly sealed so that no gap is created, for example, by airtight tape Y2 (see Figure 7).

[0055] As described above, the second airtight material 60 of this embodiment is composed of a separately formed fitting portion 61 and an outer edge portion 62, but the second airtight material 60 is not limited to this configuration. For example, the second airtight material 60 may be composed of two divided pieces, with the fitting portion 61 and the outer edge portion 62 being formed integrally, and also divided at the position of the lower surface covering portion 62a, as in Figure 4. Furthermore, the second airtight material 60 may be composed of a plate portion formed integrally with the non-peripheral beam 20 by joining it to the non-peripheral beam 20 by welding or the like.

[0056] Furthermore, the detailed shape of the second airtight material 60 is not particularly limited. The second airtight material 60 may be plate-shaped as in this embodiment, or it may be block-shaped with an outer shape corresponding to the shape of the surrounding interface. Moreover, the second airtight material 60 in this embodiment includes a fitting portion 61 and an outer edge portion 62 that match the shape of the non-perimeter beam 20 made of H-shaped steel, but the fitting portion 61 and the outer edge portion 62 can be shaped to match the actual shape of the non-perimeter beam 20. Therefore, if the non-perimeter beam 20 is made of, for example, C-shaped steel, the fitting portion 61 may be shaped to match the shape of the recess 21 inside the C-shaped steel, and the outer edge portion 62 may be shaped to match the outer surface shape of the C-shaped steel. As mentioned above, the non-perimeter beam 20 is not limited to H-shaped steel or C-shaped steel, but may have a different shape, such as L-shaped steel or T-shaped steel. When the non-perimeter beam 20 is L-shaped steel or T-shaped steel, the recess 21 inside refers to the recess formed between the web and flange of the non-perimeter beam 20. The fitting portion 61 of the second airtight material 60 may be shaped to match the shape of the recess 21. The outer edge portion 62 may be shaped to match the outer surface shape of the non-peripheral beam 20, similar to the case where the non-peripheral beam 20 is an H-shaped steel or a C-shaped steel. Furthermore, the outer edge of the outer edge portion 62 may be shaped to match the outer surface of the second fire-resistant material 40, or it may extend outward from the second fire-resistant material 40.

[0057] Furthermore, as shown in Figure 4, the second airtight material 60 of this embodiment includes connecting parts 62a1, 62b1, and 62c1 that are exposed from the second fire-resistant material 40 and connected to the first airtight material 50. In other words, the connecting parts 62a1, 62b1, and 62c1 are not covered by the second fire-resistant material 40. The second airtight material 60 of this embodiment extends outward from the second fire-resistant material 40, and the connecting parts 62a1, 62b1, and 62c1 of this embodiment are composed of these extended parts. More specifically, the connecting parts 62a1, 62b1, and 62c1 of the second airtight material 60 of this embodiment are the parts of the outer edge 62 that extend outward from the second fire-resistant material 40. The connecting part 62a1 is the part of the lower surface covering portion 62a of the outer edge 62 of the second airtight material 60 that extends outward from the second fire-resistant material 40. The connecting portion 62b1 is a portion of one side covering portion 62b of the outer edge portion 62 of the second airtight material 60 that extends outward from the second fire-resistant material 40. The connecting portion 62c1 is a portion of the other side covering portion 62c of the outer edge portion 62 of the second airtight material 60 that extends outward from the second fire-resistant material 40. Thus, the second airtight material 60 of this embodiment is provided with connecting portions 62a1, 62b1, and 62c1 that are exposed from the second fire-resistant material 40 on the lower and side sides of the non-peripheral beam 20. By providing the connecting portions 62a1, 62b1, and 62c1 of the second airtight material 60, the first airtight material 50 and the second airtight material 60 can be easily connected. The connection between the first airtight material 50 and the connection portions 62a1, 62b1, and 62c1 of the second airtight material 60 is made using, for example, airtight tape Y1 (see Figure 7) to ensure that no gaps are created. However, the connection portion of the second airtight material 60 is not limited to the configuration of this embodiment. For example, the second airtight material 60 may not extend so as to protrude from the outer surface of the second fire-resistant material 40, but may have a connection portion that is exposed from the second fire-resistant material 40 so as to be flush with the outer surface of the second fire-resistant material 40 (see Figure 9). Alternatively, the second airtight material 60 may have a plate-like portion that extends along the outer surface of the second fire-resistant material 40 as a connection portion (see Figure 10). Details of these will be described later (see Figures 9 and 10).

[0058] As described above, the second airtight material 60 in this embodiment is positioned to separate the first ventilated fire-resistant material 31 of the first fire-resistant material 30 from the second ventilated fire-resistant material 41 of the second fire-resistant material 40. Therefore, the statement above that "the second airtight material 60 is exposed from the second fire-resistant material 40" means that in this embodiment, the second airtight material 60 is not covered by the adjacent second ventilated fire-resistant material 41.

[0059] Figure 6 shows the state during construction before the indoor side of the first ventilated fire-resistant material 31 is covered by the first airtight material 50. As shown in Figure 6, the first ventilated fire-resistant material 31 of this embodiment comprises a base portion 35 and a protruding portion 36. The base portion 35 extends vertically on the indoor side of the outer perimeter beam 10. More specifically, the base portion 35 of this embodiment extends vertically so as to cover the indoor side surface of the outer perimeter beam 10. The base portion 35 of this embodiment is composed of a part of the indoor covering portion 31b. The protruding portion 36 protrudes from the base portion 35 along the extension direction B of the non-outer perimeter beam 20 around the non-outer perimeter beam 20. In other words, the protruding portion 36 of this embodiment is a rising portion that rises from the indoor covering portion 31b constituting the base portion 35 toward the extension direction B of the non-outer perimeter beam 20 around the non-outer perimeter beam 20. Figure 7 shows the state in which the first airtight material 50 is placed on the indoor side of the first ventilated fire-resistant material 31, and the first airtight material 50 and the second airtight material 60 are connected, starting from the state shown in Figure 6. As shown in Figure 7, starting from the state shown in Figure 6, the first airtight material 50 is positioned to cover the indoor side of the base portion 35 of the first ventilated fire-resistant material 31. As shown in Figures 6 and 7, the second airtight material 60 is interposed between the tip surface of the protrusion 36 of the first ventilated fire-resistant material 31 and the second fire-resistant material 40. More specifically, in this embodiment, the second airtight material 60 is interposed between the tip surface of the protrusion 36 of the first ventilated fire-resistant material 31 and the second ventilated fire-resistant material 41 of the second fire-resistant material 40. As shown in Figure 7, the first airtight material 50 and the second airtight material 60 are connected by attaching airtight tape Y1 across the space between the indoor-facing surface of the first airtight material 50, which is located on the indoor side of the base portion 35, and the surface of the second airtight material 60 that faces the second fire-resistant material 40. Note that the airtight tape Y1 is not shown in Figure 4.

[0060] Thus, the first ventilated fire-resistant material 31, which is positioned on the indoor side of the outer perimeter beam 10, is equipped with the aforementioned base portion 35 and projection portion 36. By positioning the second airtight material 60 between the tip surface of the projection portion 36 and the second fire-resistant material 40, the positional relationship between the first airtight material 50 and the second airtight material 60, which are positioned on the indoor side of the base portion 35, in the extending direction B can be easily adjusted to a positional relationship that facilitates the application of airtight tape Y1 across both. In this embodiment, the indoor side surface of the first airtight material 50 and the second fire-resistant material 40 side surface of the second airtight material 60 are adjusted to be flush. This facilitates airtight sealing between the first airtight material 50 and the second airtight material 60.

[0061] In particular, the second airtight material 60 of this embodiment includes the aforementioned connecting parts 62a1, 62b1, and 62c1. Therefore, airtight sealing between the first airtight material 50 and the second airtight material 60 can be performed more easily.

[0062] As mentioned above, the connection portion of the second airtight material 60 is not limited to the configuration of this embodiment. Figures 9 and 10 show modified examples of the connection portion of the second airtight material 60. Figure 9 shows a configuration in which the second airtight material 60 does not extend so as to protrude from the outer surface of the second fire-resistant material 40, and the second airtight material 60 has a connection portion 63 that is exposed from the second fire-resistant material 40 so as to be flush with the outer surface of the second fire-resistant material 40. Figure 10 shows a configuration in which the second airtight material 60 has a plate-like portion as the connection portion 63 that extends along the outer surface of the second fire-resistant material 40. The second airtight material 60 with the plate-like portion as the connection portion 63 shown in Figure 10 may be formed from, for example, a metal plate. As shown in Figures 9 and 10, the airtight tape Y1 may be attached so as to straddle the connection portion 63 of the second airtight material 60 and the first airtight material 50. Thus, the connection portion of the second airtight material 60 is not limited to the configuration of this embodiment shown in Figure 7, etc., as long as it is exposed from the second fire-resistant material 40.

[0063] Furthermore, as shown in Figures 7, 9, and 10, it is preferable that the second airtight material 60 and the web 20a of the non-perimeter beam 20 are connected by airtight tape Y2 or the like so that no gaps are created between them.

[0064] Figure 8 shows a modified example of the configuration near the second airtight material 60. For the sake of explanation, the second fire-resistant material 40 is not shown in Figure 8. As shown in Figure 8, the fire-resistant airtight structure 100 may further include a heat-shielding material 70 that covers at least a portion of the fitting portion 61 of the second airtight material 60 from at least one side in the extending direction B of the non-peripheral beam 20. It is preferable that the heat-shielding material 70 is arranged in contact with the second fire-resistant material 40 (see Figure 6, etc.). In the example shown in Figure 8, both sides of the fitting portion 61 of the second airtight material 60 in the extending direction B are covered by the heat-shielding material 70. By providing such a heat-shielding material 70, it is possible to suppress the exposure of the outer perimeter beam 10 or non-perimeter beam 20 to flames or the transfer of heat to the outer perimeter beam 10 or non-perimeter beam 20 through the gap between the second airtight material 60 and the first fire-resistant material 30 or second fire-resistant material 40 adjacent to the second airtight material 60.

[0065] The material for the heat-shielding material 70 can be any material that has heat-shielding properties. Furthermore, it is preferable that the material for the heat-shielding material 70 has sufficient airtightness, similar to the second airtight material 60 described above. Moreover, it is even more preferable that the material for the heat-shielding material 70 be selected from flame-retardant materials, semi-noncombustible materials, noncombustible materials, or fire-resistant materials that can ensure the fire resistance performance of the fire-resistant covering structure of the outer perimeter beams and non-outer perimeter beams. Examples of heat-shielding materials 70 that can satisfy these characteristics include flame-retardant plastic sheets, metal sheets, gypsum boards, cement boards, calcium silicate boards, etc.

[0066] It is preferable that the heat-shielding material 70 is positioned in contact with the adjacent first fire-resistant material 30 or second fire-resistant material 40 so that no gap is created between it and the adjacent first fire-resistant material 30 or second fire-resistant material 40.

[0067] The fire-resistant and airtight structure and fire-resistant building according to the present invention are not limited to the specific configurations shown in the embodiments and modifications described above, and various modifications, changes, and combinations are possible as long as they do not deviate from the scope of the claims. For example, in the embodiments and modifications described above, a configuration is illustrated in which the second airtight material 60 partitions between the first fire-resistant material 30 (more specifically, the first ventilated fire-resistant material 31 of the first fire-resistant material 30) and the second fire-resistant material 40 (more specifically, the second ventilated fire-resistant material 41 of the second fire-resistant material 40), but the invention is not limited to this configuration. As shown in Figure 11, the second airtight material 60 may be configured to partition the second fire-resistant materials 40 together. More specifically, the second airtight material 60 shown in Figure 11 is configured to partition the second ventilated fire-resistant material 41 of the second fire-resistant material 40 together. As shown in Figure 11, the area around the second ventilated fire-resistant material 41, which is located on the side of the first fire-resistant material 30 that is on the joint 80 (see Figure 1) side with respect to the second airtight material 60, is covered with an airtight material 90. The airtight material 90 is not particularly limited as long as it has airtight properties. Therefore, the material and thickness of the airtight material 90 are not particularly limited as long as it has sufficient airtightness. Examples of such an airtight material 90 include synthetic resin sheets and sheets such as metal foil containing aluminum. If the airtight material 90 is made of such an airtight sheet, the airtight material 90 may be attached to the second ventilated fire-resistant material 41 in advance to form an integrated structure. Alternatively, the airtight material 90 may be a foamed resin-based airtight insulation material such as phenolic foam, polystyrene foam, or urethane foam. The airtight material 90 shown in Figure 11 is made of a foamed resin-based airtight insulation material. By using a foamed resin-based airtight insulation material for the airtight material 90, the insulation properties can be improved in addition to the airtightness. In the example shown in Figure 11, the space between the first airtight material 50 and the airtight material 90 is sealed with airtight tape Y3. [Industrial applicability]

[0068] This invention relates to fire-resistant and airtight structures and fire-resistant buildings. [Explanation of symbols]

[0069] 2: Outer wall 2a: Exterior wall panels 2b: Insulation 2c: Interior materials 3: Floor 3a: Floor slab material 3b: Ceiling interior material 3c: Floor interior material 10: Perimeter beam 10a: Web 10b: Upper flange 10c: Lower flange 20: Non-periphery beam 20a: Web 20b: Upper flange 20c: Lower flange 21: Recess 30: 1st refractory material 31: First breathable fire-resistant material 31a: Lower covering portion 31a1: End of the lower covering portion 31b: Indoor side covering 31b1: Upper end of indoor-side covering 32: First airtight fire-resistant material 33: Fire-resistant wall material 34: Fire-resistant flooring 35: Base section 36:Protrusion 40:Second refractory material 41: Second breathable fire-resistant material 41a: Lower surface covering part 41b, 41c: Side covering portion 41b1, 41c1: Upper end of the side covering portion 42: Second airtight fire-resistant material 50: First airtight material 50a: Lower end of the first airtight material 50b: Upper end of the first airtight material 60: Second airtight material 61: Insertion part 62: Outer edge 62a: Lower surface covering part 62b, 62c: Side covering 62a1, 62b1, 62c1: Connection part 70: Heat shield material 80: Joint 90: Airtight material 100: Fire-resistant and airtight structure 200: Fireproof buildings A: Direction of extension of the outer perimeter beam B: Extension direction of non-perimeter beams X: Ventilation channel Y1, Y2, Y3: Airtight tape

Claims

1. The outer perimeter beams extend along the outer perimeter wall, A non-perimeter beam is joined to the aforementioned perimeter beam and extends from the aforementioned perimeter beam toward the interior side, A first breathable fire-resistant material made of a fibrous material is provided at a position covering the indoor side of the outer perimeter beam, and the first fire-resistant material is covering the perimeter beam. A second breathable fire-resistant material made of a fibrous material is provided and covers the periphery of the non-peripheral beam, The first airtight material covers the indoor side of the first ventilated fire-resistant material, A fire-resistant and airtight structure comprising: a second airtight material that partitions the space between the first fire-resistant material and the second fire-resistant material, or between the second fire-resistant materials themselves, and is arranged to block the ventilation passage extending in the extending direction, which is formed around the non-peripheral beam by being covered by the second fire-resistant material, and is connected to the first airtight material.

2. The fire-resistant airtight structure according to claim 1, wherein the second airtight material is exposed from the second fire-resistant material and includes a connecting portion that connects to the first airtight material.

3. The first breathable fire-resistant material is, On the indoor side of the aforementioned outer perimeter beam, there is a base portion that extends vertically, The non-peripheral beam comprises a projection that extends from the base portion along the extending direction of the non-peripheral beam, The first airtight material is positioned to cover the indoor side of the base portion of the first ventilated fire-resistant material. The second airtight material is interposed between the tip surface of the protrusion of the first ventilated fire-resistant material and the second fire-resistant material. The fire-resistant airtight structure according to claim 1 or 2, wherein the first airtight material and the second airtight material are connected by an airtight tape being applied so as to span between the indoor-facing surface of the first airtight material and the fire-resistant surface of the second airtight material.

4. The non-peripheral beam has a recess extending in the direction of extension, The second airtight material has a fitting portion that is housed and positioned in the recess of the non-peripheral beam, The fire-resistant airtight structure according to claim 1 or 2, further comprising a heat-shielding material that covers at least a portion of the fitting portion of the second airtight material from at least one side of the non-peripheral beam in the extending direction.

5. A fire-resistant building having a fire-resistant and airtight structure as described in claim 1 or 2.

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