JP7228412B2 - Fireproof coating structure - Google Patents

Description

The present invention relates to a fire-resistant coating structure in which the surfaces of columns and beams of a structure are coated with a different type of fire-resistant coating material. The present invention relates to a fireproof covering structure covered with rock wool.

BACKGROUND ART Conventionally, pillars and beams of steel buildings are coated with a fireproof coating for the purpose of improving fireproof performance. In order to ensure the beauty of the appearance of the fire-resistant coating, a rock wool coating or the like is sometimes formed on parts that are not visible to the human eye, and foaming fire-resistant paint is applied to the visible parts. If a sufficient fireproof coating cannot be formed at the boundary between the rock wool coating and the fireproof paint, the fireproof performance of the building will deteriorate. As a technique for solving such problems, for example, the structure of Patent Document 1 is known.

In the structure of Patent Document 1, the surface of the steel material is divided into a region A made of foaming fire-resistant paint and a region B made of non-foaming fire-resistant material such as rock wool through the boundary. The thickness of the refractory paint in the vicinity is locally thickened. By doing so, when the fire-resistant paint is heated and foamed, the thickness of the fire-resistant paint near the boundary is prevented from becoming thin, and the fire-resistant performance of the boundary is ensured.

JP 2006-002535 A

By the way, if the conventional technique of Patent Document 1 is applied to a structure in which one longitudinal side of a steel beam made of H-shaped steel is coated with rock wool for fire resistance and the other side is coated with fire resistant paint, The painting work of the fire-resistant paint becomes complicated, and there is a risk of pushing up the construction cost. Therefore, there has been a demand for a structure that can be easily constructed and that can ensure the fireproof performance of the boundary between different types of fireproof covering materials.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a fire-resistant coating structure that can be easily constructed and that can ensure fire-resistant performance at the boundary between dissimilar fire-resistant coating materials.

In order to solve the above-described problems and achieve the object, the fireproof coating structure according to the present invention comprises different types of fireproof coating materials that respectively coat different regions of the longitudinal surface of the shaped steel, and the different types of fireproof coating A fire-resistant coating structure in which the ends of the material are overlapped with a predetermined overlap margin, and the fire-resistant coating material of a different type is provided on the first region of the surface of the shaped steel and has a foaming property that foams when heated. and a non-foamed refractory cladding provided on a second region of the surface of the section adjacent to the first region and overlapping the surface of the intumescent refractory cladding at its ends. characterized by consisting of

Another fire-resistant coating structure according to the present invention is characterized in that, in the above invention, the foamable fire-resistant coating material is fire-resistant paint and the non-foaming fire-resistant coating material is rock wool.

Further, in another fireproof covering structure according to the present invention, in the above-described invention, the shaped steel is H-shaped steel, the non-foaming fireproof covering material is cloth-like, and the end portion of the non-foaming fireproof covering material is the first member arranged in a U-shape when viewed toward the web between the web and the flange of the section steel, and L when viewed toward the flange in the U-shaped recess of the first member It is characterized by comprising a second member arranged in a letter shape and a third member covering the first member, the second member, and the flange from the outside.

Further, another fireproof covering structure according to the present invention is characterized in that, in the invention described above, the first member is arranged in a direction in which the U-shaped concave portion opens toward the second region.

According to the fire-resistant coating structure of the present invention, different types of fire-resistant coating materials are provided to cover different regions of the surface of the shaped steel in the longitudinal direction, and the ends of the different types of fire-resistant coating materials are overlapped with each other with a predetermined overlap. A refractory coating structure laminated together, wherein the dissimilar refractory coating material comprises an intumescent refractory coating material provided on a first region of the surface of the section steel and foamed by heating, and an intumescent refractory coating material adjacent to the first region. Since it consists of a non-foaming fire-resistant coating material provided on the second region of the surface of the shaped steel and the end portion is superimposed on the surface of the foaming fire-resistant coating material, it can be easily applied and is different. The effect is that the fireproof performance of the boundary portion of the fireproof covering material can be ensured.

In addition, according to another fire-resistant coating structure according to the present invention, the foamable fire-resistant coating material is a fire-resistant coating, and the non-foaming fire-resistant coating material is rock wool. and rock wool.

Further, according to another fire-resistant coating structure according to the present invention, the shaped steel is H-shaped steel, the non-foaming fire-resistant coating material is cloth-like, and the end portion of the non-foaming fire-resistant coating material has a shape. a first member arranged between the steel web and the flange in a U-shape when viewed toward the web and an L-shape when viewed toward the flange in the U-shaped recess of the first member; Since it is composed of the arranged second material, the first material, the second material, and the third material that coats the flange from the outside, the boundary between the dissimilar fireproof coating materials that coat the H-beam steel with fireproofing can be simplified. It is effective in that it can be constructed on the ground and that its fire resistance can be ensured.

Further, according to another fireproof coating structure according to the present invention, the first member is arranged in the direction in which the U-shaped recess opens toward the second region, so the boundary from the first region side There is an effect that the appearance of the part can be improved.

FIG. 1 is a schematic diagram showing an embodiment of a fireproof covering structure according to the present invention, (1) is a side view, and (2) is a cross-sectional view taken along line CC. FIG. 2 is a partial view showing an embodiment of the fireproof covering structure according to the present invention, (1) is a side view, and (2) is a cross-sectional view taken along line CC. FIG. 3 is an enlarged view of a main part showing an embodiment of a fireproof covering structure according to the present invention. FIG. 4 is a partial view showing an embodiment of the fireproof covering structure according to the present invention, (1) is a side view, and (2) is a cross-sectional view taken along line CC. FIG. 5 is a partial view showing an embodiment of a fireproof covering structure according to the present invention, where (1) is a side view and (2) is a cross-sectional view taken along line CC. FIG. 6 is a schematic side view showing another embodiment of the fireproof covering structure according to the present invention.

EMBODIMENT OF THE INVENTION Below, embodiment of the fireproof covering structure which concerns on this invention is described in detail based on drawing. In the present embodiment, it is assumed that joints and joints are coated with fireproof materials of different types when constructing a frame with precoated members. In addition, this invention is not limited by this embodiment.

As shown in FIG. 1, the fireproof covering structure 10 according to the embodiment of the present invention includes a beam 12 made of H-shaped steel (shaped steel), which is different in the longitudinal direction of a region A (first region), a region B (second The second area) is provided with a fire-resistant paint 14 and a heat-resistant rock wool 16 (a different type of fire-resistant coating material). The beam 12 has a web 18, an upper flange 20, a lower flange 22, and a floor slab 24 is provided on the upper surface of the upper flange 20. As shown in FIG.

The fire-resistant paint 14 is a foaming material that expands and increases in thickness when heated, and as shown in FIG. be done. The heat-resistant rock wool 16 is, as shown in FIG. material). As shown in FIG. 3, at the boundary 26 between the fire-resistant paint 14 and the heat-resistant rock wool 16, the end 16A of the heat-resistant rock wool 16 overlaps the end 14A of the fire-resistant paint 14 with an overlap W. It is A thickness t1 of the fire-resistant paint 14 is set to be much smaller than a thickness t2 of the heat-resistant rock wool 16. - 特許庁

As shown in FIG. 4, the piece 1 is a cloth-like material obtained by bending a rectangular piece into a U shape, and is provided in a concave portion 28 defined by a web 18 and upper and lower flanges 20 and 22 . The piece 1 is arranged in a U-shape when viewed from the side of the beam 12, and the edges are in close contact with the web 18, and the bent ends 1A are fixed to the upper and lower flanges 20, 22 with welding pins 30. The U-shaped concave portion 32 opens toward the region B. As shown in FIG. As shown in FIG. 5, the piece 2 is a cloth-like material obtained by bending a rectangular piece into an L shape, and is closely arranged in the concave portion 32 of the piece 1 in an L shape when viewed from the bottom of the beam 12 . One side 2A of the piece 2 is fixed to the web 18 with a welding pin 34. As shown in FIG. The piece 3 is a cloth-like material that covers the pieces 1, 2 and the lower flange 22 from the outside, as shown in FIG. The end 3A of piece 3 is bent outward along floor slab 24 and fixed to upper flange 20 with weld pin 36 . Piece 1, piece 2 and piece 3 have the same thickness t2.

The overlap width W can be set to about the thickness t2 of the heat-resistant rock wool 16, for example. Also, the position of the welding pin 30 that fixes the piece 1 to the upper and lower flanges 20, 22 can be set at a position slightly separated from the end portion 14A of the fire-resistant paint 14 (for example, about 10 mm). However, the overlapping margin and the fixing position (the position of the welding pin 30) of the present invention are not limited to this, and can be changed as appropriate within a range that does not hinder the effects of the present invention. Also, the thickness t1 of the fire-resistant paint 14 is set to about 1.75 mm, the thickness t2 of the heat-resistant rock wool 16 is set to about 20 mm, and the overlapping width W of the boundary portion 26 is set to about 20 mm (eg, 20 mm±10 mm). may In this way, as will be described later, excellent fire resistance can be ensured.

According to the fireproof coating structure 10 of the present embodiment, the fireproof performance of not only the boundary portion 26 but also the entire boundary portion 26 can be ensured without locally increasing the thickness of the foamable fireproof paint 14 at the boundary portion 26. can. Therefore, this embodiment can be constructed more easily than the above-described conventional structure, and can ensure the fireproof performance of the boundary portion 26 of the dissimilar fireproof coating materials. Also, the appearance of the boundary portion 26 from the area A side can be improved. This embodiment is particularly effective for ensuring the fireproof performance of boundaries when joints and joints are covered with fireproof materials of different types when constructing a frame with precoated members.

In the above-described embodiment, the case where the concave portion 32 of the piece 1 of the heat-resistant rock wool 16 is arranged toward the region B has been described as an example, but the present invention is not limited to this. For example, as shown in FIG. 6, the piece 1 may be arranged so that the concave portion 32 faces the fireproof paint 14 side (region A), and the piece 2 may be arranged in the concave portion 32 . In this way, the appearance of the boundary 26 from the side of the fire-resistant coating 14 (area A) may be spoiled, but it is possible to ensure a predetermined fire-resistant performance.

Further, in the above embodiment, the case where H-section steel is coated with fire-resistant paint and heat-resistant rock wool has been described as an example, but the present invention is not limited to H-section steel. It can also be applied to fire-resistant coating of steel with fire-resistant paint and heat-resistant rock wool. Even if it does in this way, there can exist an effect similar to the above.

(Verification of effects of the present invention)
Next, experiments and results conducted to verify the effects of the present invention will be described.

In this experiment, the fire resistance performance (1-hour fire resistance performance) of the joint portion of the dissimilar fire resistance coating materials under load was investigated in the fire resistance coating structure according to the present invention. The test body was composed of a steel frame beam (H-shaped steel) coated with fire-resistant paint and heat-resistant rock wool, and had a fire-resistant paint main material thickness of 1.75 mm, a heat-resistant rock wool thickness of 20 mm, and an overlap of 20 mm.

The H-shaped steel used was H-400×200×8×13 mm, SM490A. As the fire-resistant paint, one manufactured by Kansai Paint Co., Ltd. was used. For the undercoat, trade name: Esco NB Mild K (Esco is a registered trademark) (JIS K 5551: Weak solvent-modified epoxy resin paint) was used, and the film thickness (dry) was set to 60 μm (target value). The main material used was Fireproof Tect (registered trademark) (polyether-based resin paint), and the film thickness (dry) was 1750 µm (actual film thickness measurement). For the intermediate coating, trade name: Fireproof Tect E (JIS K 5659: epoxy resin coating) was used, and the film thickness (dry) was set to 30 μm (target value). For the top coat, a product name: Fireproof Tect F (JIS K 5659: fluorine-based resin paint) was used, and the film thickness (dry) was set to 25 μm (target value). As the heat-resistant rock wool, a highly heat-resistant rock wool manufactured by NICHIAS Corporation (trade name: Makibee (registered trademark), thickness: 20 mm) was used.

The heat-resistant rock wool at the boundary has a thickness of 20 mm and is composed of piece 1 (first material), piece 2 (second material), and piece 3 (third material). The piece 1 is U-shaped in longitudinal section and measures 500 mm high×110 mm wide×20 mm thick. However, about 50 mm of the height is the length along the upper flange, and about 50 mm is the length along the lower flange. The piece 2 is L-shaped in cross section and measures 350 mm high by 160 mm wide by 20 mm thick. However, 50 mm of the width is the width of the fold along the web of the H-section steel. The piece 3 is U-shaped with its upper end folded back with respect to the cross section of the beam, and has a length (circumferential direction of the cross section of the beam) of 1120 mm, a width (axial direction) of 915 mm and a thickness of 20 mm. The overlapping margin between the piece 1 and the refractory paint is 20 mm.

An ALC plate with a thickness of 100 mm and a width of 600 m was attached to the upper side of the beam with stud bolts to simulate a floor. The load on the specimen was set at two points of trisection, and heating was performed in a state in which a long-term allowable bending moment (long-term allowable tensile stress) was applied to the beam. Heating was performed so that the temperature over time measured by a thermocouple followed the standard heating temperature curve of ISO834-1. The heating time was set to 60 minutes, and after the heating was finished, the steel material was allowed to cool while the load was continued until the temperature of the steel material began to fall and the displacement was stabilized.

Furnace temperature, test piece temperature, test piece displacement, and load are measured, and if the deflection amount or deflection speed of the beam exceeds the specified value (maximum deflection 182.25 mm, maximum deflection speed 8.10 mm/min), A test was performed to determine when the specimen could no longer support the load. As a result of this test, before and after heating, the deflection amount or deflection rate of the beam did not exceed the specified value. As a result, it was confirmed that the specimen had a predetermined fire resistance (one-hour fire resistance).

In the above test body, the case of the piece 1 having a height of 500 mm, a width of 110 mm, and a thickness of 20 mm was explained. ] and +50 mm or less, preferably +10 mm or less. The width may be set to width=[((flange width)−(web thickness))/2+14.0 mm] or more and +10 mm or less. In addition, although the case of the piece 2 having a height of 350 mm, a width of 160 mm, and a thickness of 20 mm has been described, the height is calculated as follows: height = [(beam length) - (flange thickness) x 2 - (thickness of piece 1 )×2+16 mm] and +10 mm or less. The width may be set to width=[(width of piece 1)+50 mm] or more and +50 mm or less, preferably +10 mm or less. In addition, although the piece 3 has a length (circumferential direction of the beam cross section) of 1120 mm, a width (axial direction) of 915 mm, and a thickness of 20 mm, length = [(beam length) × 2 + (beam width ) +100 mm] and +50 mm or less, preferably +20 mm or less. Also, although the overlapping margin between the piece 1 and the fire-resistant paint is 20 mm, the overlapping margin may be set within ±10 mm of the thickness of the heat-resistant rock wool. It is considered that the fire resistance similar to the above test results can be obtained even in the above manner.

As described above, according to the fire-resistant coating structure of the present invention, different types of fire-resistant coating materials are provided to cover different regions of the surface of the shaped steel in the longitudinal direction, and the ends of the different types of fire-resistant coating materials are A fire-resistant coating structure stacked with a predetermined overlapping margin, wherein the different fire-resistant coating material is a foamable fire-resistant coating material that is provided on a first region of the surface of the shaped steel and foams when heated; It consists of a non-foaming refractory coating provided on a second region of the surface of the shaped steel adjacent to the first region and having an end portion superimposed on the surface of the foaming refractory coating. It can be constructed and the fireproof performance of the boundary between different types of fireproof coating materials can be ensured.

In addition, according to another fire-resistant coating structure according to the present invention, the foamable fire-resistant coating material is a fire-resistant coating, and the non-foaming fire-resistant coating material is rock wool. And the fireproof performance of the boundary between rock wool can be ensured.

Further, according to another fire-resistant coating structure according to the present invention, the shaped steel is H-shaped steel, the non-foaming fire-resistant coating material is cloth-like, and the end portion of the non-foaming fire-resistant coating material has a shape. a first member arranged between the steel web and the flange in a U-shape when viewed toward the web and an L-shape when viewed toward the flange in the U-shaped recess of the first member; Since it is composed of the arranged second material, the first material, the second material, and the third material that coats the flange from the outside, the boundary between the dissimilar fireproof coating materials that coat the H-beam steel with fireproofing can be simplified. In addition to being able to be constructed in

Further, according to another fireproof coating structure according to the present invention, the first member is arranged in the direction in which the U-shaped recess opens toward the second region, so the boundary from the first region side You can make the part look better.

INDUSTRIAL APPLICABILITY As described above, the fire-resistant coating structure according to the present invention can be used, for example, to secure the fire-resistant performance at the boundary between the fire-resistant paint and the different fire-resistant coating materials such as heat-resistant rock wool that cover different regions in the longitudinal direction of the shaped steel. It is useful and especially suitable for easy construction.

1 piece (first material)
1A, 2A, 3A end 2 piece (second material)
3 piece (third material)
10 fireproof coating structure 12 beam (shaped steel)
14 Fire-resistant paint 14A, 16A End 16 Heat-resistant rock wool 18 Web 20 Upper flange 22 Lower flange 24 Floor slab 26 Boundary 28, 32 Recess 30, 34, 36 Welding pin A region (first region)
B region (second region)
t1, t2 Thickness W Overlap

Claims (3)

A fire-resistant coating structure comprising different types of fire-resistant coating materials covering different regions of the longitudinal surface of a shaped steel, and end portions of the different types of fire-resistant coating materials being overlapped with each other with a predetermined overlapping margin, ,
The dissimilar refractory coating materials are a foamable refractory coating material that is provided on a first region of the surface of the shaped steel and foams when heated, and a second region of the surface of the shaped steel that is adjacent to the first region. a non-intumescent refractory covering having an edge superimposed on the surface of the intumescent refractory covering ;
The section steel is H-section steel, the non-foaming fire-resistant coating is cloth-like, and the end of the non-foaming fire-resistant coating is between the web of the section steel and the flange when viewed toward the web A first member arranged in a U shape in the first member, a second member arranged in an L shape when viewed toward the flange in the U-shaped recess of the first member, the first member, the second member and a third material covering the flange from the outside . 2. The fireproof covering structure according to claim 1 , wherein the first member is arranged in a direction in which the U-shaped recess opens toward the second region. 3. The fire-resistant coating structure according to claim 1, wherein the foaming fire-resistant coating material is fire-resistant paint and the non-foaming fire-resistant coating material is rock wool.

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