JP7313870B2 - Fireproof coating structure and fireproof coating construction method - Google Patents

Description

The disclosure herein relates to fire resistant coating structures and fire resistant coating methods. In particular, the present invention relates to a fireproof coating structure and a fireproof coating method that can be applied to both fireproof interior building materials and non-fireproof interior building materials.

One of the methods for verifying that a building is fire-resistant under the Building Standards Law is the fire-resistant performance verification method. In this verification method, the fire duration is calculated for each fire prevention section, and the specifications (materials used, coating thickness, etc.) of the fire-resistant coating applied to the pillars and beams that form the framework of the building are determined so that the building can maintain its soundness as a structure during this fire duration.

A fire-resistant building can be constructed by using members, such as concrete, which simultaneously achieve the function of securing the structure and the function of securing fire resistance and fire resistance. Moreover, it is also possible to construct a part (member) that secures the structure and a part (member) that secures fire resistance and fire resistance separately.

As an example of separating the part (member) that secures the structure and the part (member) that secures fire resistance and fire resistance, a steel frame member is used as a member that secures the structure, and a fireproof covering material is used as a member that secures fire resistance. For example, in Patent Document 1, as a fireproof covering structure of a steel frame member that constitutes a building frame beam or frame column, a fireproof covering structure including a steel frame member, a fireproof covering material surrounding the steel frame member, and a fireproof covering reinforcing structure consisting of a fireproof covering material surrounding the fireproof covering structure is described.

Further, Patent Document 2 describes a steel frame fireproof covering structure in which a heat absorption pack is attached to the entire surface or a part of the surface of a steel material constituting a beam, column, etc. of an H-shaped, I-shaped or box-shaped steel frame, and then, surrounding the steel material, an inorganic fiber mixed mat, a fireproof board, a fireproof insulation material such as a rock wool or cement slurry sprayed material, and a flame shielding material such as a metal plate or a ceramic thin plate are attached.

Japanese Patent No. 5839928 JP-A-7-133640

In fire-resistant buildings, interior building materials such as floors and walls are generally made of fire-resistant members such as concrete (reinforced concrete) and autoclaved lightweight concrete (ALC) (see paragraph 0018 of Patent Document 1). Therefore, as described in Patent Literature 1 and Patent Literature 2 above, the fireproof coating structure of the joint portion between the steel frame member and the interior building material constituting the building frame beam or frame column is formed so that only the steel frame portion is covered with the fireproof coating material.

By the way, a case where a non-fireproof interior building material made of a non-refractory material is used as the interior building material is also assumed. However, the fireproof covering structure described in Patent Document 1 and Patent Document 2 is only described as an example in which members having fireproof performance are used as interior building materials. A fire-resistant coating structure that combines interior building materials and steel frame members, and a fire-resistant coating structure and a fire-resistant coating construction method that can use either conventionally used fire-resistant interior building materials or non-fire-resistant interior building materials are not known.

The disclosure in the present specification is made to solve the above problems, and as a result of intensive research,
(1) abut one end of the steel frame member against the first surface of the interior building material;
(2) By covering the first surface of the interior building material with the first fireproof covering material so as to cover the periphery of one end of the steel frame member,
We have newly found that the above problem can be solved.

That is, an object of the disclosure of the present specification is to provide a new fireproof coating structure and fireproof coating method.

The disclosure herein relates to a fire resistant coating structure and a fire resistant coating construction method, which are described below.

(1) an interior building material;
a first refractory covering;
a steel member;
including
a contact surface of one end of the steel frame member contacts a first surface of the interior building material;
The first fireproof covering material covers the first surface of the interior building material so as to cover the periphery of one end of the steel frame member.
Fireproof coated structure.
(2) the interior building material is a non-fireproof interior building material;
The fireproof covering structure according to (1) above.
(3) further comprising a second refractory cladding;
The second fireproof coating indirectly covers a portion where the contact surface of one end of the steel frame member and the first surface of the interior building material are in contact,
The fireproof covering structure according to (1) or (2) above.
(4) At least part of the second fireproof covering material is arranged to contact the outer surface of the other end of the steel frame member,
The fireproof covering structure according to (3) above.
(5) Both ends of the second fireproof covering material are attached so as to be in contact with the first fireproof covering material covering the first surface of the interior building material.
The fireproof covering structure according to (3) or (4) above.
(6) At least one of the second to sixth surfaces of the interior building material is coated with the first fireproof coating material.
The fireproof covering structure according to any one of (1) to (5) above.
(7) further comprising a third refractory coating;
The third refractory cladding is attached to the steel frame member and spaced apart from the second refractory cladding.
The fireproof covering structure according to any one of (3) to (6) above.
(8) one end of the steel frame member and the first surface of the interior building material are in indirect contact;
The fireproof covering structure according to any one of (1) to (7) above.
(9) A fireproof coating construction method using an interior building material, a first fireproof coating material, and a steel frame member,
The fireproof coating method is
a step of abutting one end of the steel frame member against the first surface of the interior building material and attaching the first fireproof covering material to the first surface of the interior building material so as to cover the periphery of the one end;
or,
A step of attaching the first fireproof covering material having a notch into which one end of the steel frame member can be inserted to the first surface of the interior building material, and inserting one end of the steel frame member into the notch;
including any of the steps of
Fireproof coating method.

The fire resistant cladding structures and fire resistant cladding methods disclosed herein enable the formation of fire resistant cladding structures whether the interior building materials are fire resistant interior building materials or non-fire resistant interior building materials.

1A and 1B are cross-sectional views schematically showing a fireproof covering structure 1a according to the first embodiment. 2A and 2B are cross-sectional views schematically showing a fireproof covering structure 1b according to the second embodiment. 3A and 3B are cross-sectional views schematically showing a fireproof covering structure 1c according to the third embodiment.

Various embodiments of the fireproof coating structure and the fireproof coating construction method will be described in detail below with reference to the drawings. In this specification, members having the same type of function are given the same or similar reference numerals. Further, repetitive descriptions of members denoted by the same or similar reference numerals may be omitted.

(First embodiment of fireproof covering structure)
A fireproof covering structure 1a according to a first embodiment will be described with reference to FIGS. 1A and 1B. 1A and 1B will be simply referred to as "FIG. 1", and FIG. 1A and FIG. 1B will be referred to only when they are to be distinguished from each other. The same applies to FIGS. 2 and 3 below. FIG. 1 is a cross-sectional view schematically showing a fireproof covering structure 1a according to the first embodiment. The fireproof covering structure 1a according to the first embodiment includes at least an interior building material 2, a steel frame member 3 constituting a structural beam or a structural column of a building, and a first fireproof covering material 4.

As used herein, the term "interior building materials" means building materials used for floors, walls, ceilings, and the like. The interior building material 2 according to the first embodiment may be either a fire-resistant interior building material made of a fire-resistant material or a non-fire-resistant interior building material made of a non-fire-resistant material. Examples of fireproof interior building materials include fireproof interior building materials stipulated in "1399, 2000 [Notice related to Building Standard Law] Matters to determine the construction method of fireproof structure" stipulated based on the provisions of Article 2, Item 7 of the Building Standards Law (Law No. 201 of 1950). For example, when the interior building material 2 is a floor, the following two types are described.

"1. The construction method of the floor that conforms to the technical standards set forth in Article 107, Item 1 and Item 2 of the Cabinet Order (Item 1 is limited to the case where the heat from a normal fire is applied for 2 hours.) shall be a structure that falls under any of the following items (a) to (c).
A. Reinforced concrete, steel-framed reinforced concrete construction with a thickness of 10 cm or more.

"2. The construction method of the floor that conforms to the technical standards set forth in Article 107, Item 1 and Item 2 of the Cabinet Order (Item 1 is limited to the case where the heat from a normal fire is applied for one hour.) shall be a structure that falls under any of the following (a) to (c).
(a) Reinforced concrete or steel-framed reinforced concrete construction with a thickness of 7 cm or more (b) Concrete block, brick or stone reinforced with iron material, with a wall thickness of 5 cm or more, and with a concrete block, brick or stone cover thickness of 4 cm or more (c) Steel material coated on both sides with wire mesh mortar or concrete with a coating thickness of 4 cm or more (excluding those whose undercoat is not made of noncombustible materials).

As used herein, "non-fire-resistant interior building materials" are building materials that do not meet the criteria for fire-resistant interior building materials. For example, among the above two types of fireproof interior building materials, the following interior building materials with lower fire resistance than the lower standard (when the heat from a normal fire is applied for 1 hour) are listed.
Reinforced concrete or steel-framed reinforced concrete construction with a thickness of less than 7 cm b. Concrete block, brick or stone reinforced with iron materials with a wall thickness of less than 5 cm and a concrete block, brick or stone cover thickness of less than 4 cm over the iron material C. Both sides of the iron material are covered with wire mesh mortar or concrete with a thickness of less than 4 cm.

Also, the non-fireproof interior building material is not particularly limited as long as it can exhibit fireproof performance by being combined with the first fireproof coating material described later, so long as it can maintain the strength of the building. For example, it may be made of a combustible material such as wood. When wood is used, a non-refractory interior building material may be formed from a single piece of wood, or CLT (Cross Laminated Timber) in which cut pieces of wood are laminated and bonded together may be used. Non-fireproof interior building materials other than wood include FRP building materials and aluminum.

As the steel frame member 3, for example, an H type or an I type widely used in the field of construction can be used. FIG. 1 shows an example in which one end 31 (the upper flange in the example shown in FIG. 1) of the H-shaped steel frame member 3 is in contact with the first surface 21 of the interior building material 2, and the steel frame member 3 supports the interior building material 2 (floor). As described above, the H-shaped or I-shaped steel frame member 3 is generally used in the construction field, but other shapes may be used as long as one end 31 of the steel frame member 3 can abut against the first surface 21 of the interior building material 2. Other shapes include, for example, T-shape, L-shape, groove shape, Z-shape, prism shape, and the like. In addition to the shape, the steel frame member 3 can be said to have a contact portion (one end portion 31 ) that contacts the interior building material 2 .

In the fireproof covering structure 1a according to the first embodiment shown in FIG. The first fireproof coating material 4 is formed on the first surface 21 of the interior building material 2 so as to cover the periphery of the one end portion 31 of the steel frame member 3 . In this specification, the “contact surface 311 of the one end portion 31 of the steel frame member 3 ” means the surface of the one end portion 31 that contacts the first surface 21 of the interior building material 2 . Further, in this specification, when it is described as "covering the periphery of one end 31 of the steel frame member 3", as shown in FIG.

Further, as shown in the second and third embodiments to be described later, when the second fireproof coating material is arranged so as to cover the steel frame member 3, the gap between the first fireproof coating material 4 shown in the enlarged view and the one end portion 31 of the steel frame member 3 may be wider (does not satisfy the fireproof coating specifications of the interior building materials) because it is indirectly covered with the second fireproof coating material. In that case, the fireproof covering structure 1a according to the first embodiment may be said to be an assembled structure for forming the fireproof covering structure. The fireproof covering structure 1a according to the first embodiment also includes an assembly structure for forming the fireproof covering structure.

In a fireproof building, a fireproof compartment is defined for each fixed compartment. Therefore, although FIG. 1 shows an example in which the entire periphery of the interior building material 2 is covered with the first fireproof covering material 4, the first surface 21 side of the interior building material 2 with which the steel frame member 3 abuts should be at least covered with the first fireproof covering material 4. In addition, when the interior building material 2 is arranged across the fireproof compartment and the non-fireproof compartment, the first fireproof covering material 4 does not need to be formed on the entire surface of the first surface 21, and may be formed on the part facing the fireproof compartment. The surface opposite to the first surface 21 is defined as the second surface 22, and the surfaces orthogonal to the first surface 21 and the second surface 22 are defined as the third surface 23, the fourth surface 24, the fifth surface (the surface on the front side of the paper surface of FIG. 1, and the illustration is omitted), and the sixth surface (the surface on the back side of the paper surface of FIG. 1, and the illustration is omitted). should be covered with In other words, in addition to the first surface 21 of the interior building material 2 , at least one of the second to sixth surfaces of the interior building material 2 may be coated with the first fireproof covering material 4 .

A known fireproof covering material can be used as the first fireproof covering material 4 as long as it can cover the periphery of the one end portion 31 of the steel frame member 3 . Examples thereof include gypsum board, fiber-containing calcium silicate board, and the like.

The method of covering the first surface 21 with the first fireproof covering material 4 is not particularly limited as long as the first surface 21 other than the portion in contact with the steel frame member 3 (in FIG. 1, the contact surface 311 of the upper flange 31) can be covered with the first fireproof covering material 4. For example, first, the first fireproof covering material 4 is cut out so as to have the same shape as the one end portion 31 of the steel frame member 3 that contacts the first surface 21, and the first fireproof covering material 4 cut out on the first surface 21 is attached. Alternatively, the one end 31 of the steel frame member 3 is first brought into contact with the first surface 21, and then the divided first fireproof covering material 4 may be attached around the one end 31 of the steel frame member 3 in contact with the first surface 21. Attachment of the first fireproof coating material 4 to the first surface 21 is not particularly limited as long as both can be fixed. For example, as shown in FIG. 1A, it may be fixed using fasteners 5 such as screws and screws. Alternatively, it may be secured using a fire resistant adhesive, as shown in FIG. 1B.

In the fireproof covering structure 1a according to the first embodiment, the steel frame member 3 directly contacts the interior building material 2, and the first fireproof covering material 4 is arranged around the one end portion 31 (upper flange) of the steel frame member 3 that contacts the interior building material 2. Therefore, the fire-resistant covering structure 1a according to the first embodiment can connect the members that secure the structure, regardless of whether the interior building material 2 is a fire-resistant interior building material or a non-fire-resistant interior building material, and can increase the structural strength of the fire-resistant building. In addition, since the periphery of the one end portion 31 (upper flange) of the steel frame member 3 in contact with the interior building material 2 is covered with the first fireproof covering material 4, heat is less likely to be conducted to the steel frame member 3.

Also, the fireproof covering structure 1a according to the first embodiment can be applied to any case where the interior building material 2 is a fireproof interior building material or a non-fireproof interior building material. Therefore, if the fireproof performance is changed during construction, for example, a non-fireproof section (using the non-fireproof interior building material 2) to a fireproof section (attaching the first fireproof coating material 4 to the non-fireproof interior building material 2), even if there is a change in the fireproof performance of the fireproof section (extend the fireproof performance due to fire from 1 hour to 2 hours, attach the first fireproof coating material 4 to the fireproof interior building material 2), it can be handled. Moreover, non-fire-resistant interior building materials such as wood have a problem that they are difficult to use in fire-resistant buildings, but the options for the interior building materials 2 are expanded by the fire-resistant covering structure 1a according to the first embodiment. Furthermore, when a material other than reinforced concrete such as wood is used as the interior building material 2, the construction period is shortened due to the ease of construction, and the weight becomes lighter than reinforced concrete. As described above, the fireproof covering structure 1a according to the first embodiment provides multiple effects.

(Second embodiment of fireproof covering structure)
A fireproof covering structure 1b according to a second embodiment will be described with reference to FIG. 2 (FIGS. 2A and 2B). FIG. 2 is a cross-sectional view schematically showing a fireproof covering structure 1b according to the second embodiment. The fireproof covering structure 1b according to the second embodiment is different from the fireproof covering structure 1a according to the first embodiment in that a second fireproof covering material 6 is further provided. Otherwise, the fireproof covering structure 1b according to the second embodiment is the same as the fireproof covering structure 1a according to the first embodiment. Therefore, in the second embodiment, the second fireproof covering material 6 will be mainly described, and repeated descriptions of other configurations will be omitted.

The fireproof covering structure 1b according to the second embodiment further includes a second fireproof covering material 6, and at least part of the second fireproof covering material 6 is arranged to contact the outer surface 321 of the other end 32 of the steel frame member 3 (lower flange in the example shown in FIG. 2). In this specification, the “outer surface” of the other end portion 32 means the surface of the other end portion 32 of the steel frame member 3 opposite to the web 33 .

As shown in FIG. 2 , the second fireproof covering material 6 is arranged so as to cover the periphery of the steel frame member 3 . Therefore, it is preferable that the second fireproof covering material 6 is made of a flexible material. The second fire-resistant covering material 6 is not particularly limited as long as it is flexible and has fire resistance, but examples thereof include a fire-resistant covering material based on rock wool fibers. As the second fireproof covering material, for example, a commercially available fireproof covering material such as Makibee (registered trademark) (manufactured by NICHIAS Corporation) can be used.

In the example shown in FIG. 2 , the first end 61 and the second end 62 of the second refractory coating 6 are attached to the first refractory coating 4 attached to the first surface 21 . As shown in FIG. 2A, the second fireproof covering material 6 is fixed to the first fireproof covering material 4 using fasteners 5 such as screws and screws (the interior building material 2 and the first fireproof covering material 4 are fixed with a fireproof adhesive), or as shown in FIG. In addition, in the example shown in FIG. 2 , both ends of the first end portion 61 and the second end portion 62 of the second fireproof covering material 6 are attached to the first fireproof covering material 4 . Alternatively, one or both of the first end 61 and the second end 62 may be attached to other interior building materials not shown. If another interior building material is a fireproof interior building material, the steel frame member 3 can be covered with the second fireproof covering material 6 .

(Third Embodiment of Fireproof Coating Structure)
A fireproof covering structure 1c according to a third embodiment will be described with reference to FIGS. 3 (FIGS. 3A and 3B). FIG. 3 is a cross-sectional view schematically showing a fireproof covering structure 1c according to the third embodiment. The fireproof covering structure 1c according to the third embodiment is different from the fireproof covering structure 1b according to the second embodiment in that a third fireproof covering material 7 is further provided. Otherwise, the fireproof covering structure 1c according to the third embodiment is the same as the fireproof covering structure 1b according to the second embodiment. Therefore, in the third embodiment, the third fireproof covering material 7 will be mainly described, and repeated descriptions of other configurations will be omitted.

The fireproof covering structure 1 c according to the third embodiment further includes a third fireproof covering material 7 , and the third fireproof covering material 7 is attached inside the steel frame member 3 . In this specification, the “inner side” means a connecting member 33 (web in FIG. 3) that connects one end 31 (upper flange in FIG. 3) and the other end 32 (lower flange in FIG. 3) of the steel frame member 3, and the surfaces of the one end 31 and the other end 32 on the side of the connecting member 33. In other words, the inner side can also be said to be a portion of the steel frame member 3 that does not come into contact with the interior building material 2 , the first fireproof covering material 4 , and the second fireproof covering material 6 . The third fireproof coating material 7 may be attached and fixed to the steel frame member 3 using a fireproof adhesive. In the event of a fire, the fireproof adhesive may soften and the third fireproof covering material 7 attached to the connecting member 33 may be displaced. Therefore, if necessary, a wedge 8 may be provided on the inner side of the other end 32 to fix the third fireproof coating 7 so that it does not shift in the event of a fire. The third fireproof covering material 7 can be provided on the entire surface or part of the steel frame member 3 as long as it is inside the steel frame member 3 . Also, a portion of the third fireproof covering material 7 may be in contact with the first fireproof covering material 4 and/or the second fireproof covering material 6 .

The same material as the first fireproof covering material 4 or the second fireproof covering material 6 can be used for the third fireproof covering material 7 . By the way, it is assumed that a gypsum board is used as the third fireproof covering material 7 . Gypsum board contains about 20% of water of crystallization in a stable form, although it varies depending on the type. for that reason,
(1) When the gypsum board 7 is attached to the steel frame member 3 and the second fireproof covering material 6 is attached so as to cover the steel frame member 3, a space S is formed between the gypsum board 7 and the second fireproof covering material 6,
(2) When the temperature around the fireproof covering structure 1c rises during a fire, the water of crystallization contained in the gypsum board 7 evaporates, filling the space S with water vapor,
(3) As a result, the temperature rise of the steel frame member 3 can be suppressed, so the time for the temperature rise of the steel frame member 3 can be delayed.
(4) In addition, the water vapor filled in the space S can prevent hot air and flames from entering through the joints of the second fireproof coating material 6 and the like, so that the fireproof performance is further improved.
It has the effect of

As described above, the amount of water of crystallization contained in the gypsum board 7 is almost fixed. Therefore, in the fire-resistant covering structure 1c according to the third embodiment, the proportion of the water of crystallization in the gypsum board 7 attached to the steel frame member 3 that evaporates during a fire, and the amount of improvement in fire-resistant performance due to the water vapor filled in the space S are measured in advance by combustion experiments or the like, so that the amount of fire-resistant performance improvement in fire can be calculated based on the amount of the gypsum board 7 attached to the steel frame member 3 during construction.

Then, the required thickness of the second fireproof covering material 6 can also be calculated based on the amount of improvement in fireproof performance due to the installation of the gypsum board 7 . Therefore, in the fireproof covering structure 1c according to the third embodiment, the amount of the gypsum board 7 and the amount (thickness) of the second fireproof covering material 6 required to satisfy the Building Standards Act can be calculated in advance, so the fireproof covering structure 1c is not unnecessarily large. For example, compared to the case where the gypsum board 7 is not attached to the steel frame member 3, the thickness of the second fireproof covering material 6 can be reduced by approximately 10 to 20%. Therefore, as compared with the conventional fireproof covering structure, it is possible to reduce the projection of the building frame beams or building frame columns into the living room and to increase the volume of the living room. In the first and second embodiments, the shape of the steel frame member 3 is not particularly limited, but in the third embodiment, the steel frame member 3 preferably has a shape such as an H shape or an I shape that allows a space to be formed between the second fireproof covering material 6 and the third fireproof covering material 7.

The type of gypsum board 7 is not particularly limited as long as it is commonly used in the field of architecture.

The fireproof covering structures 1a to 1c according to the first to third embodiments are merely examples, and various design changes may be made as long as the effects of the fireproof covering structure disclosed herein are not impaired. For example, in the fireproof covering structures 1a to 1c described above, the one end 31 of the steel frame member 3 directly contacts the interior building material 2, but the one end 31 of the steel frame member 3 indirectly contacts the interior building material 2. In the case of indirect contact, for example, the first fireproof coating layer 4 may be arranged between the one end portion 31 of the steel frame member 3 and the interior building material 2 .

(Embodiment of fireproof coating method)
The fireproof covering structure 1a according to the first embodiment can be formed by a fireproof covering construction method including the following steps (1) or (2).
(1) A step of abutting one end 31 of the steel frame member 3 on the first surface 21 of the interior building material 2 and attaching the first fireproof covering material 4 to the first surface 21 of the interior building material 2 so as to cover the periphery of the one end 31.
(2) A step of attaching the first fireproof covering material 4 having a notch into which the one end 31 of the steel frame member 3 can be inserted to the first surface 21 of the interior building material 2, and inserting the one end 31 of the steel frame member 3 into the notch.

After performing the step (1) or (2), the fireproof covering structure 1b according to the second embodiment is
(3) placing at least part of the second fireproof coating 6 in contact with the outer surface 321 of the other end 32 of the steel frame member 3;
It can be formed by a fireproof coating construction method including.

Then, the fireproof covering structure 1c according to the third embodiment is provided between the step (1) or (2) and the step (3).
(4) a step of attaching a third fireproof coating to the inside of the steel frame member 3;
It can be formed by a fireproof coating construction method including.

The fire-resistant cladding structure disclosed herein can form a fire-resistant cladding structure whether the interior building material is a fire-resistant interior building material or a non-fire-resistant interior building material. Therefore, it is useful for the building industry.

1, 1a, 1b, 1c... fireproof covering structure, 2...interior building material, 3...steel frame member, 4...first fireproof covering material, 5...fixture, 6...second fireproof covering material, 7...third fireproof covering material, 8...wedge, 21...first surface of interior building material, 22...second surface of interior building material, 23...third surface of interior building material, 24...fourth surface of interior building material, 31...one end (upper portion) of steel frame member flange), 32... other end of steel frame member (lower flange), 33... web, 61... first end of second fireproof covering material, 62... second end of second fireproof covering material, 311... contact surface of one end, 321... outer surface of other end, S... space

Claims (9)

interior building materials,
a first refractory covering;
a steel member;
including
a contact surface of one end of the steel frame member contacts a first surface of the interior building material;
The first fireproof covering material covers the first surface of the interior building material so as to cover the periphery of one end of the steel frame member.
A fire resistant coating structure, the fire resistant coating structure comprising:
An underfloor metal plate whose lower surface has an infrared reflectance of 0.4 or more and 1.0 or less is installed between the first fireproof coating material and the interior building material, or on the surface of the interior building material of the first fireproof coating material opposite to the first surface,
further comprising a second refractory cladding;
The second fireproof coating indirectly covers a portion where the contact surface of one end of the steel frame member and the first surface of the interior building material are in contact,
At least part of the second fireproof covering material is arranged to contact the outer surface of the other end of the steel frame member ,
Fireproof coated structure. interior building materials,
a first refractory covering;
a steel member;
including
a contact surface of one end of the steel frame member contacts a first surface of the interior building material;
The first fireproof covering material covers the first surface of the interior building material so as to cover the periphery of one end of the steel frame member.
A fire resistant coating structure, the fire resistant coating structure comprising:
An underfloor metal plate whose lower surface has an infrared reflectance of 0.4 or more and 1.0 or less is installed between the first fireproof coating material and the interior building material, or on the surface of the interior building material of the first fireproof coating material opposite to the first surface,
At least one of the second to sixth surfaces of the interior building material is coated with the first fireproof coating material ,
Fireproof coated structure. interior building materials,
a first refractory covering;
a steel member;
including
a contact surface of one end of the steel frame member contacts a first surface of the interior building material;
The first fireproof covering material covers the first surface of the interior building material so as to cover the periphery of one end of the steel frame member.
A fire resistant coating structure, the fire resistant coating structure comprising:
An underfloor metal plate whose lower surface has an infrared reflectance of 0.4 or more and 1.0 or less is installed between the first fireproof coating material and the interior building material, or on the surface of the interior building material of the first fireproof coating material opposite to the first surface,
one end of the steel frame member and the first surface of the interior building material are in indirect contact ;
Fireproof coated structure. In the fireproof covering structure,
It is further excluded that the area other than the periphery of one end of the steel frame member is covered with the first fireproof covering material.
The fireproof covering structure according to any one of claims 1 to 3 . The interior building material is a non-fireproof interior building material,
5. The fireproof covering structure according to any one of claims 1 to 4 . Both ends of the second fireproof covering material are attached so as to be in contact with the first fireproof covering covering the first surface of the interior building material,
The fire-resistant covering structure according to claim 1 . interior building materials,
a first refractory covering;
a second refractory covering;
a third refractory coating;
a steel member;
including
a contact surface of one end of the steel frame member contacts a first surface of the interior building material;
The first fireproof covering material covers the first surface of the interior building material so as to cover the periphery of one end of the steel frame member,
The second fireproof coating indirectly covers the portion where the contact surface of one end of the steel frame member and the first surface of the interior building material are in contact,
the third refractory cladding is made of gypsum board, is attached to the steel frame member, and is spaced apart from the second refractory cladding;
Fireproof coated structure. A fireproof coating construction method using an interior building material, a board-shaped first fireproof coating material, and a steel frame member,
The fireproof coating method is
A step of attaching one end of the steel frame member to the first surface of the interior building material, and attaching the board-shaped first fireproof covering material to the first surface of the interior building material using a fixture or a fire-resistant adhesive so as to cover the periphery of the one end;
or,
A step of attaching the first board-shaped fireproof covering material having a cutout into which one end of the steel frame member can be inserted to the first surface of the interior building material using a fixture or a fireproof adhesive , and inserting one end of the steel frame member into the cutout;
including any of the steps of
In the fireproof coating method,
An underfloor metal plate whose bottom surface has an infrared reflectance increased to 0.4 or more and 1.0 or less is installed between the first fireproof coating material and the interior building material, or on the surface opposite to the first surface of the interior building material of the first fireproof coating material.
Fireproof coating method. In the fireproof coating method,
It is further excluded that the area other than the periphery of one end of the steel frame member is covered with the first fireproof covering material.
The fireproof coating construction method according to claim 8 .