JP2020143528A - Fireproof coating structure - Google Patents

Abstract

To provide a fireproof coating structure that can be easily constructed and that can secure the fireproof performance at the boundary between different types of fireproof coating materials.SOLUTION: There is provided a fireproof coating structure 10 comprising different types of fireproof coating materials 14 and 16 that coat different regions A and B on the longitudinal surface of a shaped steel 12, respectively, in which the ends of the different types of fireproof coating materials 14 and 16 are laminated with each other via a predetermined stacking allowance. The fireproof coating materials 14 and 16 are made of a foamable fireproof coating material 14 provided in the first region A of the surface of the shaped steel 12 and foamed by heating, and a non-foamable fireproof coating material 16 provided in the second region B of the surface of the shaped steel 12 adjacent to the first region A and having an end overlapped with the surface of the foamable fireproof coating material 14.SELECTED DRAWING: Figure 1

Description

The present invention relates to a fireproof coating structure in which the surfaces of columns and beams of a structure are coated with different types of fireproof coating materials, and in particular, one side of the surface is coated with a fireproof coating material, and the other side is heat resistant through a predetermined stacking allowance. It relates to a fireproof coating structure coated with rock wool.

Conventionally, columns and beams of buildings made of steel are coated with fireproof coating for the purpose of improving fireproof performance. In order to ensure the beauty of the appearance of the fireproof coating, a rock wool coating or the like may be formed on a part that is not visible to the public, and a foamable fireproof paint may be applied to the part that is visible to the public. If a sufficient fireproof coating cannot be formed at the boundary between the rock wool coating or the like and the fireproof paint, the fireproof performance of the building will deteriorate. As a technique for solving such a problem, 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 an A region made of a foamable refractory paint and a B region made of a non-foamable refractory material such as rock wool via a boundary portion, and the boundary portion is divided. The thickness of the refractory paint in the vicinity is locally increased. By doing so, when the refractory paint is heated and foamed, the thickness of the refractory paint near the boundary portion is prevented from becoming thin, and the fire resistance performance at the boundary is ensured.

Japanese Unexamined Patent Publication No. 2006-002535

By the way, when the above-mentioned technique of Patent Document 1 is applied to a structure in which one side of a steel beam made of H-section steel in the longitudinal direction is fire-resistant coated with rock wool and the other side is fire-resistant coated with fire-resistant paint, The work of applying fire-resistant paint becomes complicated, which may increase the construction cost. Therefore, there has been a demand for a structure that can be easily constructed and that can secure the fire resistance performance at the boundary between different types of fire resistant coating materials.

The present invention has been made in view of the above, and an object of the present invention is to provide a fireproof coating structure that can be easily constructed and that can secure the fireproof performance of the boundary portion of different types of fireproof coating materials.

In order to solve the above-mentioned problems and achieve the object, the fireproof coating structure according to the present invention comprises different types of fireproof coating materials that cover different regions of the longitudinal surface of the shaped steel, and the different types of fireproof coatings. A fire-resistant coating structure in which the ends of the materials are laminated with each other through a predetermined stacking allowance, and different types of fire-resistant coating materials are provided in the first region of the surface of the shaped steel and foamed by heating. And a non-foamable fire-resistant coating material provided in the second region of the surface of the shaped steel adjacent to the first region and whose ends are superimposed on the surface of the foamable fire-resistant coating material. It is characterized by consisting of.

Further, another fireproof coating structure according to the present invention is characterized in that, in the above-mentioned invention, the foamable fireproof coating material is a fireproof paint and the non-foamable fireproof coating material is rock wool.

Further, in the other fireproof coating structure according to the present invention, in the above-mentioned invention, the shaped steel is H-shaped steel, the non-foamable fireproof coating material is cloth-like, and the end portion of the non-foamable fireproof coating material. Is a first material arranged in a U shape when viewed toward the web between the web and the flange of the shaped steel, and L when viewed toward the flange in the U-shaped recess of the first material. It is characterized in that it is composed of a second material arranged in a character shape and a third material that covers the first material, the second material, and the flange from the outside.

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

According to the fireproof coating structure according to the present invention, different types of fireproof 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 fireproof coating materials are connected to each other through a predetermined stacking allowance. The different types of fire-resistant coating materials, which are laminated and laminated, are adjacent to the foamable fire-resistant coating material which is provided in the first region of the surface of the shaped steel and foams by heating. Since it is composed of a non-foamable fire-resistant coating material provided in the second region of the surface of the shaped steel and whose end is overlapped with the surface of the foamable fire-resistant coating material, it can be easily installed and is different from each other. It has the effect of ensuring the fire resistance of the boundary of the fire resistant coating material.

Further, according to another fireproof coating structure according to the present invention, since the foamable fireproof coating material is fireproof coating material and the non-foaming fireproof coating material is rock wool, it can be easily applied and the fireproof coating material. It has the effect of ensuring the fire resistance of the boundary between rock wool and rock wool.

Further, according to another fireproof coating structure according to the present invention, the shaped steel is H-shaped steel, the non-foamable fireproof coating material is cloth-like, and the end portion of the non-foamable fireproof coating material is shaped. The first material arranged in a U shape when viewed toward the web between the steel web and the flange, and the L shape when viewed toward the flange in the U-shaped recess of the first material. Since it is composed of the arranged second material and the third material that covers the first material, the second material, and the flange from the outside, the boundary portion of the different types of fireproof coating material that fireproofly coats the H-section steel is simplified. It has the effect of being able to be installed in a steel manner and ensuring its fire resistance.

Further, according to another fireproof coating structure according to the present invention, since the first material is arranged in the direction in which the U-shaped recess opens toward the second region, the boundary from the first region side. It has the effect of improving the appearance of the club.

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

Hereinafter, embodiments of the refractory coating structure according to the present invention will be described in detail with reference to the drawings. In the present embodiment, when constructing a frame with pre-coated members, it is assumed that joints and joints are fire-resistant coated with different materials. The present invention is not limited to this embodiment.

As shown in FIG. 1, the refractory coating structure 10 according to the embodiment of the present invention has different regions A (first region) and B (first region) in the longitudinal direction of the beam 12 made of H-shaped steel (shaped steel). The refractory paint 14 for covering each of the two regions) and the heat-resistant rock wool 16 (different types of refractory coating materials) are provided. The beam 12 has a web 18, an upper flange 20, and a lower flange 22, and a floor slab 24 is provided on the upper surface of the upper flange 20.

The refractory paint 14 is a foamable paint that foams and thickens when heated, and is provided on the entire surface of the web 18 and the lower flange 22 and on the edges and the lower surface of the upper flange 20 by painting or the like, as shown in FIG. Be done. As shown in FIG. 1, the heat-resistant rock wool 16 is a non-foaming material processed into a cloth shape, and has a piece 1 (first material), a piece 2 (second material), and a piece 3 (third material). Material). As shown in FIG. 3, at the boundary portion 26 between the refractory paint 14 and the heat-resistant rock wool 16, the end portion 16A of the heat-resistant rock wool 16 is superposed on the end portion 14A of the refractory paint 14 via a stacking allowance W. Has been done. The thickness t1 of the refractory paint 14 is set to be much smaller than the thickness t2 of the heat-resistant rock wool 16.

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

The stacking allowance W can be set to, for example, a thickness t2 of the heat-resistant rock wool 16. Further, the position of the welding pin 30 for fixing the piece 1 to the upper and lower flanges 20 and 22 can be set at a position separated from the end portion 14A of the refractory paint 14 by a slight distance (for example, about 10 mm). However, the stacking allowance and the fixing position (position of the welding pin 30) of the present invention are not limited to this, and can be appropriately changed as long as the action and effect of the present invention are not impaired. Further, the thickness t1 of the refractory 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 overlap margin W of the boundary portion 26 is set to about 20 mm (for example, 20 mm ± 10 mm). You may. In this way, excellent fire resistance can be ensured, as will be described later.

According to the fireproof coating structure 10 of the present embodiment, it is possible to secure not only the boundary portion 26 but also the entire fireproof performance without locally increasing the thickness of the foamable fireproof paint 14 at the boundary portion 26. it can. Therefore, this embodiment can be easily constructed as compared with the above-mentioned conventional structure, and can secure the fire resistance performance of the boundary portion 26 of the different types of fire resistant coating materials. In addition, the appearance of the boundary portion 26 from the region A side can be improved. This embodiment is particularly effective in ensuring the fire resistance performance of the boundary portion when the joint portion and the joint portion are fireproof coated with different materials when constructing the frame with the precoated member.

In the above embodiment, the case where the recess 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 recess 32 faces the refractory paint 14 side (region A), and the piece 2 may be arranged in the recess 32. In this way, the appearance of the boundary portion 26 from the refractory paint 14 side (region A) may be spoiled, but a predetermined refractory performance can be ensured.

Further, in the above embodiment, the case where the H-shaped steel is fire-resistant coated with a fire-resistant paint and heat-resistant rock wool has been described as an example, but the present invention is not limited to the H-shaped steel, and for example, a channel steel or a chevron. It can also be applied when steel or the like is fire-resistant coated with fire-resistant paint and heat-resistant rock wool. Even in this way, the same action and effect as described above can be obtained.

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

In this experiment, in the fireproof coating structure according to the present invention, the fire resistance performance (1 hour fire resistance performance) of the connecting portion of different types of fireproof coating materials at the time of loading was investigated. The test piece was composed of a steel beam (H-shaped steel) coated with a 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 a stacking allowance of 20 mm.

As the H-section steel, H-400 × 200 × 8 × 13 mm, SM490A was used. The fireproof paint used was manufactured by Kansai Paint Co., Ltd. As the undercoat, the 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 60 μm (target value). The main material used was a trade name: Fireproof Tect (registered trademark) (polyether-based resin paint), and the film thickness (dry) was 1750 μm (actual film thickness measurement). As the intermediate coating, a trade name: Fireproof Tect E (JIS K 5569: epoxy resin paint) was used, and the film thickness (dry) was set to 30 μm (target value). The top coat used was a trade name: Fireproof Tect F (JIS K 5569: Fluorine-based resin paint), and the film thickness (dry) was 25 μm (target value). As the heat-resistant rock wool, 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 portion had a thickness of 20 mm and was composed of piece 1 (first material), piece 2 (second material), and piece 3 (third material). The piece 1 has a U-shaped vertical cross section, and has a height of 500 mm, a width of 110 mm, and a thickness of 20 mm. 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 has an L-shaped cross section, and has a height of 350 mm, a width of 160 mm, and a thickness of 20 mm. However, 50 mm of the width is the width of the folded-back along the web of the H-shaped steel. The piece 3 has a U-shape with the upper end folded back with respect to the beam cross section, and has a length (circumferential direction of the beam cross section) of 1120 mm × a width (axial direction) of 915 mm × a thickness of 20 mm. The overlap 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 the floor. The load on the test piece was set to three equal division points and two points, and heating was performed with a long-term allowable bending moment (long-term allowable tensile stress) applied to the beam. The heating was performed so that the time course of the temperature measured by the thermocouple was in line with the standard heating temperature curve of ISO834-1. The heating time was 60 minutes, and after the heating was completed, the steel material was allowed to cool while being loaded until the temperature of the steel material entered the falling process and the displacement became stable.

When the temperature inside the furnace, the temperature of the specimen, the displacement of the specimen, and the load are measured, and the amount of deflection or the deflection speed of the beam exceeds the specified values (maximum deflection amount 182.25 mm, maximum deflection speed 8.10 mm / min), A test was conducted to determine that the specimen could no longer support the load. As a result of this test, the amount of deflection or the deflection speed of the beam did not exceed the specified value before and after heating. As a result, it was confirmed that the test piece had a predetermined fire resistance (1 hour fire resistance).

In the above test piece, the case where the height of the piece 1 is 500 mm × width 110 mm × thickness 20 mm has been described, but regarding the height, height = [(beam formation) − (flange thickness) × 2 + 126 mm. ] Or more 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. Further, the case where the height of the piece 2 is 350 mm × the width 160 mm × the thickness 20 mm has been described, but regarding the height, the height = [(beam formation) − (flange thickness) × 2- (thickness of the piece 1). ) X2 + 16 mm] or more 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. Further, the case where the length of the piece 3 (beam cross-sectional circumferential direction) 1120 mm × width (axial direction) 915 mm × thickness 20 mm has been described, but the length = [(beam formation) × 2 + (beam width). ) + 100 mm] or more and + 50 mm or less, preferably + 20 mm or less. Further, although the case where the overlapping allowance between the piece 1 and the refractory paint is 20 mm has been described, the overlapping allowance may be set within ± 10 mm as the overlapping allowance = (thickness of heat-resistant rock wool). Even with the above, it is considered that the same fire resistance performance as the above test result can be obtained.

As described above, according to the refractory coating structure according to the present invention, different types of refractory 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 refractory coating materials are connected to each other. A refractory coating structure that is laminated through a predetermined stacking allowance, and different types of refractory coating materials are provided in the first region of the surface of the shaped steel and foamed by heating. Since it is composed of a non-foaming refractory coating material provided in the second region of the surface of the shaped steel adjacent to the first region and having an end overlapped with the surface of the foaming refractory coating material, it is easy. It can be installed and the fire resistance performance at the boundary between different types of fire resistant coating materials can be ensured.

Further, according to another fireproof coating structure according to the present invention, since the foamable fireproof coating material is a fireproof coating material and the non-foaming fireproof coating material is rock wool, it can be easily applied and the fireproof coating material. The fire resistance of the boundary between rock wool and rock wool can be ensured.

Further, according to another fireproof coating structure according to the present invention, the shaped steel is H-shaped steel, the non-foamable fireproof coating material is cloth-like, and the end portion of the non-foamable fireproof coating material is shaped. The first material arranged in a U shape when viewed toward the web between the steel web and the flange, and the L-shape when viewed toward the flange in the U-shaped recess of the first material. Since it is composed of the arranged second material and the third material that covers the first material, the second material, and the flange from the outside, the boundary portion of the different types of fireproof coating material that fireproofly coats the H-section steel is simplified. It can be constructed in the same way, and its fire resistance can be ensured.

Further, according to another fireproof coating structure according to the present invention, since the first material is arranged in the direction in which the U-shaped recess opens toward the second region, the boundary from the first region side. You can improve the appearance of the club.

As described above, the refractory coating structure according to the present invention secures the fire resistance performance at the boundary between the refractory coating material that covers different regions in the longitudinal direction of the shaped steel and the different refractory coating materials such as heat resistant rock wool. It is useful and especially suitable for easy construction.

1 piece (first material)
1A, 2A, 3A 2 pieces at the end (second material)
3 pieces (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 Recesses 30, 34, 36 Welding pin A area (first area)
Area B (second area)
t1, t2 thickness W stacking allowance

Claims (4)

It is a fireproof coating structure in which different types of fireproof 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 fireproof coating materials are laminated with each other through a predetermined stacking allowance. ,
The different types of fireproof coating materials are provided in a foamable fireproof coating material provided in the first region of the surface of the shaped steel and foamed by heating, and provided in the second region of the surface of the shaped steel adjacent to the first region. A fireproof coating structure characterized in that the edges are made of a non-foamable fireproof coating material overlaid on the surface of the foamable fireproof coating material. The fireproof coating structure according to claim 1, wherein the foamable fireproof coating material is a fireproof paint, and the non-foamable fireproof coating material is rock wool. When the shaped steel is H-shaped steel, the non-foaming fire-resistant coating material is cloth-like, and the end of the non-foaming fire-resistant coating material is viewed toward the web between the web and the flange of the shaped steel. The first material arranged in a U shape, the second material arranged in an L shape when viewed toward the flange in the U-shaped recess of the first material, and the first material and the second material. The fireproof coating structure according to claim 1 or 2, further comprising a third material that covers the flange from the outside. The fireproof coating structure according to claim 3, wherein the first material is arranged in a direction in which a U-shaped recess is opened toward the second region.

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