JP2006002534A - Fire-resistant coating and its construction method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fire-resistant coating having high fire-resistant performance and provided with beautiful appearance and its construction method. <P>SOLUTION: A rock wool coating 5 is formed in a part of a surface of a basic material 3 being a plate made of a steel material by a wet type spraying method to have 25 mm thickness. Next, foam fire-resistant paint 7 is applied to have 2 mm thickness. The foam fire-resistant paint 7 is applied to a part where the rock wool coating 5 is not formed on the surface of the basic material 3 and is applied to overlap on the rock wool coating 5 partially. A layer made of the foam fire-resistant paint 7 has a part 7a on the surface of the basic material 3, a part 7b formed on an end face 5a of the rock wool coating 5, and a part 7c formed on an upper face 5b of the rock wool coating 5. Length in the lateral direction of the part 7c is 10 mm. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a fireproof coating formed on the surface of, for example, a pillar or beam of a building, and a construction method thereof.

  In steel-frame buildings, it is necessary to apply fireproof coatings to columns and beams made of steel. This is because steel is a non-combustible material, but when the temperature reaches 450 ° C. or higher, the strength drops sharply, and when it reaches 800 to 1200 ° C., it inevitably cannot withstand a fire. Therefore, the Ministry of Construction designates a certain fire resistance for each part of the building.

  Therefore, conventionally, for the purpose of improving the fire resistance performance of columns and beams made of steel, a rock wool coating is formed on the surface by wet spraying (see Non-Patent Document 1), or a fire resistance mortar is applied ( Patent Document 1 and Patent Document 2), a calcium silicate plate has been pasted.

However, the fireproof coating formed by the above method has a problem that the appearance after construction is not always beautiful. The reason is as follows.
(i) Since many fire-resistant coatings formed by the above method are relatively thick, the coating material starts out from the base material and gives a feeling of pressure.

(ii) Rock wool, refractory mortar, and calcium silicate board are difficult to repair defects after construction.
(iii) Rock wool is difficult to be finished in a desired color, and since the surface strength is weak, it is easily chipped when hit by an object.

(iv) Calcium silicate plates are vulnerable to impacts and easily chipped, and because they are regular plates, seams are formed.
Moreover, when constructing the above fireproof coating at a construction site, a large amount of coating material or the like must be carried in, and there is a problem that the transportation cost is increased due to the large weight.

Furthermore, since the above fireproof coating is thick and thick, there is a problem that the use space of the building becomes small.
Therefore, a certain level of fire resistance is required in the building, and since it is exposed to the human eye, the use of foamed fire-resistant paint is performed on the site where the appearance is required (Patent Document 3 and Patent Document 4). reference). Since the fire-resistant foam is relatively thin, it can be finished with a neat appearance with less pressure and does not reduce the building space. Moreover, since it is lightweight, the burden on material conveyance can also be reduced.
Supervised by Ministry of Construction, Housing Bureau Architecture Guidance Division, "Handbook of Fire and Disaster Prevention Structures and Materials", (Japan), New Japan Law Publishing Co., Ltd., issued February 16, 1970, 440-133-440-140, 391- 394 pages Japanese Examined Patent Publication No. 4-54634 Japanese Examined Patent Publication No. 4-63835 Japanese Patent No. 2862419 JP 2001-40290 A

  However, when a rock wool coating or the like is formed on a portion that is not touched by human eyes and a foamed fire resistant paint is applied to a portion that is touched by human eyes, a boundary between the rock wool coating or the like and the foam fire resistant paint is generated. If sufficient fireproof coating cannot be formed at this boundary, the fireproof performance of the building may be reduced.

  The present invention has been made in view of the above points, and an object thereof is to provide a fireproof coating having a high fireproof performance and a beautiful appearance, and a construction method thereof.

(1) The invention of claim 1
A fireproof coating formed on the surface of the substrate, having an A region made of foamed fireproof paint and a B region made of a non-foaming fireproof material, and at the boundary between the A region and the B region, The gist of the present invention is a fireproof coating characterized by having an overlapping portion where the foamed fireproof paint and the non-foamable fireproof material overlap.

  The fireproof coating of the present invention has an overlapping portion where the foamed fireproof paint and the nonfoamable fireproof material overlap at the boundary between the area A made of the foamed fireproof paint and the area B made of the nonfoamable fireproof material. Therefore, the fireproof coating does not become thin at the boundary, and the fireproof performance is high.

  Further, in the fireproof coating of the present invention, for example, a portion that touches the human eye can be an A region made of foamed fireproof paint, and a portion that does not touch the human eye can be a B region made of a non-foaming fireproof material. As a result, the non-foaming refractory material, which may lack in appearance, is not exposed to the human eye, and both fire resistance performance and appearance can be achieved.

  Further, in the fireproof coating of the present invention, since the foamed fireproof paint is used in the A region, the use amount of the nonfoamable fireproof material is small as compared with the case where only the nonfoamable fireproof material is used. Therefore, labor and cost required for carrying in and transporting the non-foaming refractory material can be reduced.

-As said base material, the building materials which consist of steel materials are mentioned, for example, Specifically, a pillar, a beam, etc. are mentioned, for example.
-The said foam fireproof paint means what contains a foaming agent, a carbonizing agent, resin, a coloring pigment, an additive etc., for example.

  Examples of the foaming agent include ammonium polyphosphate, dicyandiamide, azocarbonamide, melamine and derivatives thereof, urea, guanidine, trimethylolmelamine, hexamethylolmiramin, and the like. The blending amount of the foaming agent is preferably in the range of 100 to 600 parts by weight with respect to 100 parts by weight of the resin.

  As the carbonizing agent, polyhydric alcohols such as pentaerythritol, dipentaerythritol, tripentaerythritol, polypentaerythritol, polysaccharides, expandable graphite, and the like formed only by carbon, oxygen, and hydrogen can be used. . The amount of the carbonized material is preferably in the range of 25 to 300 parts by weight with respect to 100 parts by weight of the resin.

  Examples of the resin include melamine resin, acrylic resin, alkyd resin, vinyl chloride resin, vinyl acetate resin, urethane resin, epoxy resin, silicone resin, and polyester resin. These resins may be used alone, or may be copolymerized or used in combination. Further, these resins may be either dissolved in an organic solvent or dispersed in water as an emulsion. The resin plays a role of providing adhesion and weather resistance of the coating film at room temperature.

  Examples of the color pigment include titanium dioxide, silicate, carbonate, aluminum oxide, clay, clay, shirasu, and mica. The blending amount of the coloring raw material is preferably in the range of 25 to 200 parts by weight with respect to 100 parts by weight of the resin.

  As said additive, an antifoamer, a dispersing agent, a sagging prevention agent etc. are mentioned, for example. Examples of antifoaming agents include anionic antifoaming agents such as sulfonic acid type and phosphoric acid ester type, nonionic antifoaming agents such as alkylphenol type, fatty acid ester type and polyethylene glycol type, and cation such as imidazoline type. Examples thereof include amphoteric antifoaming agents such as system antifoaming agents and betaine types.

  Examples of the dispersant include anionic dispersants such as sulfonic acid type and phosphate ester type, nonionic dispersants such as alkylphenol type, fatty acid ester type and polyethylene glycol type, and cationic dispersants such as imidazoline type. And amphoteric dispersants such as betaine type.

-Examples of the non-foaming refractory material include rock wool, refractory mortar, calcium silicate plate and the like.
-As a length of the said overlap part, the range of 2-100 mm is suitable, for example. By being 2 mm or more, the effect of the invention becomes more remarkable. Even if it exceeds 100 mm, the effect of the invention is exhibited, but the waste of the fireproof coating material is increased.

The length of the overlapping portion is preferably the same as the thickness of the non-foaming refractory material, and is preferably in the range of three times the thickness, which is 2 times the thickness of the foam refractory paint (before foaming). A length more than double is preferred.
(2) The invention of claim 2
The gist of the fireproof coating according to claim 1, wherein the non-foamable fireproof material is present between the foamed fireproof paint and the base material in the overlapping portion.

In the fireproof coating of the present invention, as shown in FIG. 1A, the foamed fireproof paint 7 is applied on the non-foamable fireproof material 5 in the overlapping portion at the boundary between the A region and the B region. . As shown in FIG. 1B, the foamed refractory paint 7 applied on the non-foamable refractory material 5 foams in a fan shape toward the periphery, as shown in FIG. Spread towards. Therefore, in the portion near the overlapping portion in the A region, the layer of the foam refractory paint 7 becomes thick due to the contribution of the foam refractory paint 7 applied on the non-foamable refractory material 5. As a result, the fireproof fireproof coating of the present invention has high fireproof performance even at the boundary between the A region and the B region, where the fireproof performance has conventionally been insufficient.
(3) The invention of claim 3
The gist of the fireproof coating according to claim 1, wherein the foamed fireproof paint is present between the non-foamable fireproof material and the base material in the overlapping portion.

In the fireproof coating of the present invention, as shown in FIG. 2 (a), the foamed fireproof paint 7 is disposed between the non-foamable fireproof material 5 and the base material 3 in the overlapping portion at the boundary between the A region and the B region. It is in. Therefore, when heated, the foamed refractory paint 7 in the overlapping portion cannot foam in situ, and as shown in FIG. 2 (b), the region A where the non-foamable refractory material 5 is not present. Pushed out. In the region A, the thickness of the foamed refractory paint increases by the amount of the extruded foamed refractory paint 7 in the portion close to the overlapping portion. As a result, the fireproof coating of the present invention has high fireproof performance without the fireproof coating becoming thin even at the boundary between the A region and the B region, where the fireproof performance is likely to be insufficient.
(4) The invention of claim 4
The non-foaming refractory material is rock wool, and the gist thereof is the fireproof coating according to any one of claims 1 to 3.

  In the present invention, rock wool is used as the non-foaming refractory material. Since this rock wool is porous, the foamed fireproof paint is likely to penetrate (especially when the foamed fireproof paint is applied after the application of the non-foamable fireproof material). As a result, in the present invention, rock wool and foamed fire-resistant paint are well adapted to perform foaming with a throwing effect.

As the rock wool, for example, cement (for example, ordinary Portland cement (JIS R 5201), blast furnace cement (JIS R 5211), white cement) 25 to 40 parts by weight, and rock wool (JIS A 9504) 60 to 75 What consists of a weight part is suitable.
(5) The invention of claim 5
The gist of the fireproof coating according to any one of claims 1 to 3, wherein the non-foaming fireproof material is a fireproof mortar.

The refractory mortar used in the refractory coating of the present invention has good workability when constructed by spraying, troweling or the like. For this reason, the fireproof coating of the present invention also has good workability during construction.
In addition, the refractory mortar is excellent in design because it can be made thin and troweled. As a result, the fireproof coating of the present invention is excellent in design.
Furthermore, refractory mortar and foam refractory paint are familiar (especially when applying foam refractory paint after application of non-foamable refractory material). Thereby, the fireproof coating of the present invention can perform foaming with a throwing effect.

-As said refractory mortar, what contains hydraulic cement and a lightweight aggregate is mentioned, for example.
Examples of the hydraulic cement include simple cements such as Portland cement and alumina cement, mixed cements such as lime mixed cement, blast furnace cement, silica cement, fly ash cement, and high sulfate slag cement.

  Lightweight aggregates include expanded pearlite, expanded shale, expanded vermiculite, pumice, silasparn, etc., which are foamed or expanded natural minerals, foamed silica gel, and foamed granulated various slugs Artificial lightweight aggregates such as those obtained by granulating glass foam and foaming and those obtained by granulating clay foam and foaming. The amount of the lightweight aggregate is preferably in the range of 20 to 300% by weight with respect to 100 parts by weight of the hydraulic cement.

  The refractory mortar may further contain a re-emulsifiable synthetic resin emulsion powder. The re-emulsifiable synthetic resin emulsion powder was obtained by drying a synthetic resin emulsion obtained by emulsion polymerization in a particle state, or obtained by drying a synthetic resin emulsion obtained by post-emulsification in a particle state. There are things. Usually, a vinyl-based synthetic resin emulsion is adjusted to such a form, and thermoplastic resins such as acrylic ester, styrene, vinyl chloride, and vinyl acetate can be exemplified as typical substances. From the viewpoint of miscibility with hydraulic cement and fire-resistant coating workability, and from the viewpoint of easy availability, it is most preferable. Besides these, an epoxy resin, a urethane resin, a silicone resin, a polyester resin, and the like can be adjusted to a re-emulsifiable powder. The blending amount of the re-emulsifiable synthetic resin emulsion powder is preferably in the range of 3 to 50% by weight with respect to 100 parts by weight of the hydraulic cement.

In addition, the refractory mortar may include a material having an endothermic effect (for example, an endothermic substance such as aluminum hydroxide or calcium carbonate, water, or the like) or a material that imparts heat insulation performance (such as styrene or aluminum foil).
(6) The invention of claim 6
The gist of the fireproof coating according to any one of claims 1 to 3, wherein the non-foaming fireproof material is a calcium silicate plate.

Since the fireproof coating of the present invention uses a calcium silicate plate as a non-foaming fireproof material, the thickness of the foamed fireproof paint can be made uniform, and uniform foaming can be obtained.
-As said calcium-silicate board, the thing containing a calcium silicate, a fiber, etc. is mentioned, for example.

Examples of the fibers include mineral fibers such as rock wool, plant fibers such as pulp fibers, cotton and hemp, synthetic fibers such as nylon, vinylon, and acrylic, and alkali-resistant glass fibers.
(7) The invention of claim 7
The gist of the fireproof coating according to any one of claims 1 to 6, wherein the base material is a pillar or beam of a building.

ADVANTAGE OF THE INVENTION According to this invention, the fireproof performance of the pillar and beam which require the intensity | strength at the time of a fire can be improved.
Further, according to the present invention, the part of the pillar or beam that can be seen by the human eye can be an area A made of foamed fire-resistant paint, and the part that cannot be seen by the human eye can be made an area B made of a non-foaming refractory material. . As a result, the non-foaming refractory material, which may lack in appearance, is not exposed to the human eye, and both fire resistance performance and appearance can be achieved.

Application | coating of a fireproof foaming layer and attachment of a non-foaming fireproof material can be performed so that the circumference | surroundings of a pillar or a beam may be covered, for example.
(8) The invention of claim 8
It is a construction method of the fireproof covering in any one of Claims 1-7,
The gist of the construction method of the fireproof coating is characterized in that the application of the foamed fireproof paint and the attachment of the non-foamable fireproof material are performed in accordance with the stacking order in the overlapping portion.

According to the present invention, the fireproof coating according to any one of claims 1 to 7 can be formed.
According to the stacking order, for example, as shown in FIG. 1, when there is a non-foaming refractory material between the foamed refractory paint and the base material in the overlapping portion, the non-foaming refractory material This refers to the application of foam fire-resistant paint after the first attachment. In addition, as shown in FIG. 2, when there is a foamed refractory paint between the non-foamable refractory material and the base material in the overlapping portion, the foamed refractory paint is applied first and the non-foamable refractory material is applied. It means to attach later.

  The example (Example) of the form of the fireproof coating of this invention and its construction method is demonstrated below.

a) First, a method of applying the fireproof coating of the first embodiment will be described with reference to FIG.
The base material 3 forming the fireproof coating 1 is a steel plate. A rock wool coating 5 was formed on a part of the surface of the substrate 3 with a thickness of 25 mm by wet spraying. The composition of the rock wool coating is as follows.

Ordinary Portland cement (JIS R 5201): 25 to 40 parts by weight Rock wool (JIS A 9504): 60 to 75 parts by weight Blast furnace cement (JIS R 5211) and white cement may be used instead of ordinary Portland cement. it can.

Here, among the portions where the rock wool coating 5 is formed, the portion that does not overlap with the foamed fireproof paint 7 described later is the B region.
Next, the foam fireproof paint 7 was applied to a thickness of 2 mm by spraying. The foam refractory paint 7 is applied to a portion of the surface of the base material 3 where the rock wool coating 5 is not formed (A region), and an overlap occurs at the boundary between the rock wool coating 5 and the foam refractory coating 7. It was applied as follows.

  Therefore, the layer made of the foamed fire-resistant paint 7 includes a portion 7 a on the base material 3, a portion 7 b that overlaps the end surface 5 a of the rock wool coating 5, and a portion 7 c that overlaps the upper surface 5 b of the rock wool coating 5. The rock wool coating 5 exists between the portion 7 c and the base material 3. The length of 7c in the horizontal direction (left-right direction in FIG. 1) is 10 mm.

The composition of the foam refractory paint 5 is as follows.
Foaming agent (ammonium polyphosphate): 44 parts by weight Carbonizing agent (polyhydric alcohol): 11 parts by weight Resin (vinyl acetate-acrylic copolymer resin): 27 parts by weight Color pigment (titanium oxide): 14 parts by weight Additives (antifoaming agent, dispersing agent, anti-sagging agent, etc.): 4 parts by weight b) Next, the action of the fireproof coating 1 of Example 1 during heating will be described with reference to FIG.

A heating test was performed on the fireproof coating 1 and the substrate 3 in accordance with the heating conditions of ISO843. In this heating test, the ambient temperature was set to the following formula (1).
Expression (1) T = 345 × log ₁₀ (8t + 1) +20
Here, T is the atmospheric temperature in the furnace containing the fireproof coating 1 and the base material 3, and t is the time after the start of the test (in minutes).

When t reached 1 hour (that is, when the atmospheric temperature in the furnace reached 945 ° C.), the heating was stopped and the mixture was allowed to cool naturally, and the specimen was taken out.
When the fireproof coating 1 and the substrate 3 taken out were observed, the foamed fireproof paint 7 was foamed as shown in FIG. At this time, the thickness of the foam refractory paint 7 in the portion where the rock wool coating 5 was not formed was all 30 mm or more.

In particular, in the vicinity of the end surface 5a of the rock wool coating 5, the thickness of the foamed refractory paint 7 is much thicker than the portion far from the end surface 5a.
This is because, in the vicinity of the end surface 5 a of the rock wool coating 5, in addition to the foam refractory paint 7 a applied on the substrate 3, the foam refractory paint 7 b and the rock wool coating 5 applied on the end surface 5 a of the rock wool coating 5. This is because the foamed refractory paint 7c applied to the upper surface 5b foams.

Further, the thickness of the foamed refractory paint 7 on the upper surface 5b of the lock rule coating 5 was 15 mm.
c) Next, the effect produced by the fireproof coating 1 of the first embodiment will be described.

  (i) In the fireproof coating 1 of Example 1, the fireproof coating does not become thin even at the boundary between the rock wool coating 5 and the foamed fireproof coating 7. Therefore, any part of the fireproof coating 1 has high fireproof performance.

  (ii) In the fire-resistant coating 1 of the first embodiment, for example, a portion that touches the human eye is a portion where the foamed fire-resistant paint 7 is applied, and a portion that does not touch the human eye is a portion where the rock wool coating 5 is formed. it can. This makes it possible to achieve both fire resistance and beautiful appearance.

  (iii) The fire-resistant coating 1 of Example 1 requires a smaller amount of coating than the case where only the rock wool coating 5 is used, and labor and cost required for carrying in and transporting the coating can be reduced.

a) First, a method for constructing the fireproof coating 1 of the second embodiment will be described with reference to FIG.
First, the foamed fireproof paint 7 was applied to a part of the surface of the substrate 3 to a thickness of 2 mm by spraying. In addition, the part which does not overlap with the rock wool coating 5 mentioned later among the parts which apply | coated the foam fireproof paint 7 is A area | region.

  Next, the rock wool coating 5 was formed with a thickness of 25 mm by wet spraying. The rock wool coating 5 was formed so as to cover a portion (B region) not covered with the foam refractory paint 7 and to have an overlap at the boundary between the rock wool coating 5 and the foam refractory paint 7.

  Therefore, the layer made of the foamed fire-resistant paint 7 has a portion 7d that overlaps the lower surface of the rock wool coating 5 (that is, exists between the rock wool coating 5 and the base material 3), and the other portion 7e. ing.

In addition, the composition of the base material 3, the rock wool coating 5, and the foamed fireproof paint 7 is the same as that of the first embodiment.
b) Next, the effect of the fireproof coating 1 of the present Example 2 at the time of a heating is demonstrated using FIG.2 (b).

  When the fireproof coating 1 and the substrate 3 were heated in the same manner as in Example 1, the foamed fireproof paint foamed as shown in FIG. At this time, the thickness of the foam refractory paint 7 in the portion where the rock wool coating 5 was not formed was all 30 mm or more.

In particular, in the vicinity of the end surface 5a of the rock wool coating 5, the thickness of the foamed refractory paint 7 is much thicker than the portion far from the end surface 5a.
This is because the portion 7d on the lower side of the rock wool coating 5 of the foamed fire-resistant paint 7 is suppressed by the rock wool coating 5 on the upper side, so it cannot foam on the spot even if heated. Since it is extruded to the right side through the gap between the rock wool coating 5 and the base material 3, the thickness of the foamed refractory paint 7 in the vicinity of the end face 5a is increased accordingly.

  The fireproof coating 1 of the second embodiment has the same effects as the first embodiment.

a) First, a method of applying the fireproof coating of the third embodiment will be described with reference to FIG.
A fiber-mixed calcium silicate plate (calcium silicate plate) 9 was attached to a part (B region) of the surface of the substrate 3. The fiber-mixed calcium silicate plate 9 has a thickness of 20 mm, and its composition is as follows.

Calcium silicate: 82 parts by weight Inorganic fiber: 13 parts by weight Organic: 5 parts by weight The composition ratio (weight ratio) of the fiber-mixed calcium silicate plate 9 is 75 to 89% calcium silicate, 11% or more inorganic fiber The organic content is preferably 6% or less.

  Next, the foam fireproof paint 7 was applied to a thickness of 2 mm by spraying. The foamed refractory paint 7 is applied to a portion of the surface of the base material 3 where the fiber-mixed calcium silicate plate 9 is not attached (A region), and the fiber-mixed calcium silicate plate 9 has a boundary with the A region. It was applied also to the end face 9a located at the position of the fiber so that an overlapping portion was formed at the boundary between the fiber-mixed calcium silicate plate 9 and the foamed fireproof coating 7.

  In FIG. 3 (a), the foam refractory paint 7 is applied to all the end faces 9a of the fiber-mixed calcium silicate plate 9, but 1.2 times or more the standard film thickness of the foam refractory paint 7 with respect to the end faces 9a. It is preferable that the coating width is secured.

Therefore, the layer made of the foamed fire-resistant paint 7 has a portion 7 a applied to the surface of the substrate 3 and a portion 7 b overlapping the end surface 9 a of the fiber-mixed calcium silicate plate 9.
The composition of the base material 3 and the foamed refractory paint 7 is the same as that of the first embodiment.

b) Next, the function and effect of the fireproof coating 1 of the third embodiment during heating will be described with reference to FIG.
When the fireproof coating 1 and the base material 3 were heated in the same manner as in Example 1, the foamed fireproof coating 7 foamed as shown in FIG. At this time, the thickness of the foamed refractory paint 7 in the portion where the fiber-mixed calcium silicate plate 9 was not formed was 30 mm or more.

  In particular, in the vicinity of the end face 9a of the fiber-mixed calcium silicate plate 9, the thickness of the foamed refractory paint 7 was thicker than that of the portion far from the end face 9a. This is because the foamed refractory paint 7b applied on the end face 9a of the fiber-mixed calcium silicate plate 9 foams in addition to the foamed refractory paint 7a applied on the substrate 3.

  The fireproof coating 1 of the third embodiment has the same effects as the first embodiment.

a) First, a method for constructing the fireproof coating 1 of Example 4 will be described with reference to FIG.
First, the foamed fireproof paint 7 was applied to a part of the surface of the substrate 3 to a thickness of 2 mm by spraying. In addition, the part which does not overlap with the fiber mixing calcium silicate board 9 mentioned later among the parts which apply | coated the foam fireproof paint 7 is A area | region.

  Next, a fiber-mixed calcium silicate plate (calcium silicate plate) 9 was pasted on the substrate 3. The fiber-mixed calcium silicate plate 9 covers a portion of the surface of the base material 3 where the foamed refractory paint 7 is not applied (B region), and includes the fiber-mixed calcium silicate plate 9 and the foamed refractory coating 7. Pasting was performed so that an overlap occurred at the boundary.

  Therefore, the layer made of the foamed fire-resistant paint 7 overlaps the lower surface of the fiber-mixed calcium silicate plate 9 (that is, exists between the fiber-mixed calcium silicate plate 9 and the substrate 3), and the other portions Part 7e.

In addition, the composition of the base material 3, the rock wool coating 5, and the foamed fireproof paint 7 is the same as that of the first embodiment. The composition of the fiber-mixed calcium silicate plate 9 is the same as that in Example 3.
b) Next, the effect of the fireproof coating 1 of the present Example 4 at the time of a heating is demonstrated using FIG.4 (b).

  When the fireproof coating 1 and the substrate 3 were heated in the same manner as in Example 1, the foamed fireproof coating 7 foamed as shown in FIG. At this time, the thickness of the foamed refractory paint 7 in the portion where the fiber-mixed calcium silicate plate 9 was not formed was 30 mm or more.

In particular, in the vicinity of the end face 9a of the fiber-mixed calcium silicate plate 9, the thickness of the foamed refractory paint 7 was thicker than that of the portion far from the end face 9a.
This is because the lower part 7d of the foamed refractory paint 7 on the lower side of the fiber-mixed calcium silicate plate 9 is restrained by the fiber-mixed calcium silicate plate 9, so that even if heated, it is foamed on the spot. In other words, the foamed refractory paint 7 in the vicinity of the end face 9a is increased by that amount because it is pushed rightward from the gap between the fiber-mixed calcium silicate plate 9 and the substrate 3.

  The fireproof coating 1 of the fourth embodiment has the same effect as the first embodiment.

  The fireproof coating 1 of the fifth embodiment is basically the same as that of the third embodiment. However, in Example 5, as shown in FIG. 5A, the foamed fireproof coating 7 is also applied to the upper surface 9 b of the fiber-mixed calcium silicate plate 9.

  Therefore, the layer made of the foamed refractory paint 7 has a portion 7a on the surface of the substrate 3, a portion 7b that overlaps the end surface 9a of the fiber-mixed calcium silicate plate 9, and a portion 7c that overlaps the upper surface 9b. Between the portion 7c and the substrate 3, a fiber-mixed calcium silicate plate 9 is present. The length of 7c in the horizontal direction (left-right direction in FIG. 5) is 10 mm.

b) Next, the effect of the fireproof coating 1 of the present Example 5 at the time of a heating is demonstrated using FIG.5 (b).
When the fireproof coating 1 and the base material 3 were heated in the same manner as in Example 1, the foamed fireproof coating 7 foamed as shown in FIG. At this time, the thickness of the foamed refractory paint 7 in the portion where the fiber-mixed calcium silicate plate 9 was not formed was 30 mm or more.

  In particular, in the vicinity of the end face 9a of the fiber-mixed calcium silicate plate 9, the thickness of the foamed refractory paint 7 was thicker than that of the portion far from the end face 9a. In addition to the foamed refractory paint 7a applied on the substrate 3, the foamed refractory paint 7b applied on the end surface 9a of the fiber-mixed calcium silicate plate 9 and the foamed refractory paint 7c applied on the upper surface 9b. This is because of foaming.

  The fireproof coating 1 of the fifth embodiment has the same effects as the first embodiment.

  The fireproof coating 1 of Example 6 is basically the same as that of Example 5. However, in Example 6, as shown in FIG. 6, in the region B, a stripping plate 11 made of a fiber-mixed calcium silicate plate is provided between the base material 3 and the fiber-mixed calcium silicate plate 9. ing. That is, the fiber-mixed calcium silicate plate 9 of Example 6 is attached to the base material 3 via the pulling plate 11.

  As shown in FIG. 6, the stripping plate 11 can be disposed so as to cover the surface of the base material 3 only in a part of the region B. In this case, a gap 13 is formed between the fiber-mixed calcium silicate plate 9 and the base material 3 in the region B where the stripping plate 11 does not exist. Moreover, you may arrange | position the stripping board 11 so that the surface of the base material 3 may be covered in all the B area | regions.

The structural example of the fireproof coating 1 of the present Example 6 is demonstrated using FIG. 7, FIG.
FIG. 7A is an example in which the base material 3 is a rectangular column and the fiber-mixed calcium silicate plate 9 is attached so as to surround the periphery. FIG. 7A is a sectional view in the B region. The stripping plate 11 is affixed over the entire circumference of the substrate 3 in the B region, and the fiber-mixed calcium silicate plate 9 is attached thereon.

  However, the stripping plate 11 may not be affixed to the entire circumference of the base material 3 as described above, but may be partially affixed around the base material 3 so as to obtain a regular gap. This affixing method can also be implemented in the configuration examples of FIGS. 7B and 8A to 8C described later.

In addition, since the stripping plate 11 is not attached to the A region, the stripping plate 11 is partially attached in the longitudinal direction of the base material 3.
FIG. 7B is an example in which the base material 3 is a round column and the fiber-mixed calcium silicate plate 9 is attached so as to surround the periphery. The stripping plate 11 is partially attached to four locations on the outer peripheral surface of the base material 3, and the outer peripheral surface of the base material 3 includes a portion where the stripping plate 11 is not stretched. The portion where the stripping plate 11 is not stretched becomes a gap 13 when the fiber-mixed calcium silicate plate 9 is attached.

  FIG. 7C shows that the base material 3 is composed of a round pillar portion 3a and a base light iron portion 3b having a square cross section circumscribing the round pillar portion 3a, and surrounds the periphery of the base light iron portion 3b. This is an example in which a fiber-mixed calcium silicate plate 9 is attached. The stripping plate 11 is affixed over the entire circumference of the base light iron portion 3b, and the fiber-mixed calcium silicate plate 9 is attached thereon.

  FIG. 8A and FIG. 8B are examples in which the base material 3 is an H-shaped column and the fiber-mixed calcium silicate plate 9 is attached so as to surround the periphery thereof. In Fig.8 (a), the discard board 11 is stretched | stretched so that the recessed part of an H-shaped pillar may be plugged, and the fiber mixing calcium silicate board 9 is attached on it. Moreover, in FIG.8 (b), the discard board 11 is stretched over the perimeter of an H-shaped column, and the fiber mixing calcium silicate board 9 is attached on it.

  FIG. 8C and FIG. 8D are examples in which the base material 3 is an H-shaped combination type column and the fiber-mixed calcium silicate plate 9 is attached so as to surround the periphery. In each of these examples, the stripping plate 11 is attached to each of the four outer side surfaces of the base material 3 and the fiber-mixed calcium silicate plate 9 is attached thereon.

  However, in FIG. 8 (c), the fiber-mixed calcium silicate plate 9 is attached so that the cross-sectional shape is octagonal, and in FIG. 8 (d), the fiber-mixed calcium silicate plate 9 is so shaped that the cross-sectional shape is square. Is attached. Moreover, in the example of FIG.8 (d), the L-shaped reinforcement metal fitting 15 is attached to the joint of the fiber mixing calcium silicate board 9, and is reinforced.

7 and 8 is not limited to the fiber-mixed calcium silicate plate, and any noncombustible material can be used.
(Comparative Example 1)
A method for constructing the fireproof coating 101 of Comparative Example 1 will be described with reference to FIG.

A rock wool coating 5 was formed on a part of the surface of the substrate 3 to a thickness of 25 mm by wet spraying.
Next, the foam fireproof paint 7 was applied to a thickness of 2 mm by spraying. The foamed refractory paint 7 was applied so as not to cause a gap between the foamed refractory paint 7 and the rock wool coating 5 and so as not to overlap.

In addition, the composition of the base material 3, the rock wool coating 5, and the foamed fireproof paint 7 is the same as that of the first embodiment.
When this fireproof coating 101 was heated in the same manner as in Example 1, the foamed fireproof coating 7 foamed as shown in FIG. 9B. At this time, the thickness of the foamed refractory paint 7 was 30 mm or more at a position sufficiently away from the end face 5a of the rock wool coating 5, but was 30 mm or less in the vicinity of the end face 5a.

  As shown in FIG. 10, since foaming occurs in a fan shape at each position of the foamed refractory paint 7, at a point x away from the end face 5a, both the left point x 'and the right point x' ' This is because the thickness increases because of the contribution, whereas the thickness decreases at the point y near the end face 5a because there is no contribution from the left side.

In the fireproof coating 101 of Comparative Example 1, the thickness of the foamed fireproof paint 7 is reduced in the vicinity of the end face 5a as described above, so that the fireproof performance in this portion is lowered.
(Comparative Example 2)
A method for constructing the fireproof coating 101 of Comparative Example 2 will be described with reference to FIG.

First, a fiber-mixed calcium silicate plate 9 was attached to a part of the surface of the substrate 3.
Next, the foam fireproof paint 7 was applied to a thickness of 2 mm by spraying. The foamed refractory paint 7 was applied so that there was no gap between the foamed refractory paint 7 and the fiber-mixed calcium silicate plate 9 and did not overlap.

In addition, the composition of the base material 3, the fiber-mixed calcium silicate plate 9, and the foamed fire-resistant paint 7 is the same as in Example 3.
When this fireproof coating 101 was heated in the same manner as in Example 1, the foamed fireproof coating 7 foamed as shown in FIG. At this time, the thickness of the foamed refractory paint 7 was 30 mm or more at a position sufficiently away from the end face 9a of the fiber-mixed calcium silicate plate 9, but was 30 mm or less in the vicinity of the end face 9a. This is because, like the comparative example 1, there is no foaming on the left side in the vicinity of the end face 9a.

In the fireproof coating 101 of Comparative Example 2, the thickness of the foamed fireproof paint 7 is reduced in the vicinity of the end face 9a as described above, so that the fireproof performance at this portion is lowered.
Needless to say, the present invention is not limited to the above-described embodiments, and can be implemented in various modes without departing from the scope of the present invention.

  For example, in Examples 1-2, refractory mortar may be used instead of rock wool coating.

It is sectional drawing showing the structure of a fireproof coating. It is sectional drawing showing the structure of a fireproof coating. It is sectional drawing showing the structure of a fireproof coating. It is sectional drawing showing the structure of a fireproof coating. It is sectional drawing showing the structure of a fireproof coating. It is sectional drawing showing the structure of a fireproof coating. It is sectional drawing showing the structure of a fireproof coating. It is sectional drawing showing the structure of a fireproof coating. It is sectional drawing showing the structure of a fireproof coating. It is explanatory drawing showing foaming of a foam fireproof paint. It is sectional drawing showing the structure of a fireproof coating.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,101 ... Foam fireproof coating 3 ... Base material 5 ... Rock wool coating 7 ... Foam fireproof coating 9 ... Fiber mixed calcium silicate board 11 ... Disposal board

Claims (8)

A fireproof coating formed on the surface of the substrate,
Having an A region made of foamed fire-resistant paint and a B region made of non-foaming refractory material;
A fireproof coating comprising an overlapping portion where the foamed fireproof paint and the non-foamable fireproof material overlap at a boundary between the A region and the B region.   The fireproof coating according to claim 1, wherein the non-foamable fireproof material exists between the foamed fireproof paint and the base material in the overlapping portion.   The fireproof coating according to claim 1, wherein the foamed fireproof paint is present between the non-foamable fireproof material and the base material in the overlapping portion.   The fireproof coating according to any one of claims 1 to 3, wherein the non-foaming fireproof material is rock wool.   The fireproof coating according to any one of claims 1 to 3, wherein the non-foaming fireproof material is a fireproof mortar.   The fireproof coating according to any one of claims 1 to 3, wherein the non-foaming refractory material is a calcium silicate plate.   The fireproof coating according to claim 1, wherein the base material is a pillar or beam of a building. It is a construction method of the fireproof covering in any one of Claims 1-7,
A method for applying a fireproof coating, characterized in that the application of a foamed fireproof paint and the attachment of a non-foamable fireproof material are performed in accordance with the stacking order in the overlapping portion.

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