Fireproof coating structure and its construction method

Abstract

To provide a fireproof covering structure capable of reliably performing fireproof covering on an outer wall of a steel beam, and a construction method thereof.SOLUTION: A fireproof covering structure includes: a fire-resistant paint 26 provided to the side opposite to a wall 12 on the outer surface of a steel member 14 placed facing and close to the wall 12; and a fireproof covering material 28 provided from the side not facing wall 12 to an area where the fire-resistant paint 26 is provided. The fireproof covering material 28 may be a wraparound type fireproof covering material. Also, a clip for fixing the end of the fireproof covering material 28 on the area side where fire-resistant paint 26 is provided to the steel member 14 may be provided.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a fireproof coating structure and a construction method thereof.

Background Art

[0002] Conventionally, in the construction of steel structure buildings, the fireproof coating work of the outer peripheral beam is generally carried out after the outer wall is attached. As shown in Fig. 5(1), there is also a composite fireproof coating method in which the outer wall 1 is used as a part of the fireproof coating of the steel beam 2, but when the fireproof structure has not been certified by the country, the composite fireproof coating method cannot be applied. In that case, as shown in Fig. 5(2), the steel beam 2 must be covered with a fireproof coating material 3. In addition, the reference numeral 4 in Fig. 5 is the floor, and the reference numeral 5 is the floor slab.

[0003] On the other hand, as conventional techniques related to such fireproof coating structures, for example, those described in Patent Documents 1 to 3 are known. Patent Document 1 discloses a method of constructing a steel column or a steel beam in which a fireproof paint is applied to the inner surface of a U-shaped portion formed by the web and flange of an H-shaped steel, and then a fireproof outer plate is attached to the outside thereof, and then a fireproof material is sprayed from the inside of the steel column or the steel beam. Patent Document 2 discloses a steel column constituting a steel structure covered with a fireproof outer wall material, a fireproof coating material, and a fireproof ventilation member disposed at the butting portion thereof. Patent Document 3 discloses a fireproof coating material covering the lower flange of a steel beam extending to the side of a concrete outer wall plate, and a backing material of a non-combustible fibrous material is doubly disposed on the upper portion of the joint surface between the end surface of the fireproof coating material and the concrete outer wall plate.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0005] By the way, as shown in Fig. 5(2), when the gap L between the outer wall 1 and the lower flange 2A of the steel frame beam 2 is so small that a human hand cannot enter, it is impossible to apply the fireproof coating between the outer wall 1 and the steel frame beam 2. Even if the fireproof coating material 3 could be applied to this narrow space, it would be difficult to confirm whether the steel frame beam 2 is completely covered with the fireproof coating material 3. If there are gaps or holes even in a part of the fireproof coating material 3 and the steel frame beam 2 is exposed, the temperature of the steel frame beam 2 will rise during a fire and the strength of the steel material will decrease, and there is a risk that the member or the structure will collapse.

[0006] Therefore, when the space between the outer peripheral steel frame beam and the outer wall is narrow and the steel frame beam cannot be covered with a fireproof coating material, or when the certification of the fireproof structure has not been obtained from the country and the synthetic fireproof coating method cannot be applied, etc., a method that can surely perform the fireproof coating on the outer wall side of the outer peripheral steel frame beam has been demanded.

[0007] The present invention has been made in view of the above, and an object thereof is to provide a fireproof coating structure capable of surely performing the fireproof coating on the outer wall side of a steel frame beam and a construction method thereof.

Means for Solving the Problems

[0008] In order to solve the above-described problems and achieve the object, the fireproof coating structure according to the present invention includes a fireproof paint provided on the side facing the wall body among the outer surface of the steel frame member disposed opposite to the wall body in proximity, and a fireproof coating material provided over a region where the fireproof paint is provided from the side not facing the wall body.

[0009] Also, another fireproof coating structure according to the present invention is characterized in that, in the above-described invention, the fireproof coating material is a wound-type fireproof coating material.

[0010] In addition, another fireproof coating structure according to the present invention is characterized in that, in the above-described invention, it further includes a clip for fixing the end portion of the fireproof coating material on the side where the fireproof coating is provided to the steel member.

[0011] In addition, a fireproof coating method according to the present invention is a method for constructing the above-described fireproof coating structure, and includes a step of transporting a steel member having a fireproof coating provided in advance on the side facing the wall among the outer surfaces of the steel member to the construction site, and a step of applying a fireproof coating material from the side of the outer surface of the steel member that does not face the wall to the area where the fireproof coating is provided at the construction site.

Effect of the Invention

[0012] According to the fireproof coating structure of the present invention, among the outer surfaces of the steel members arranged opposite to each other in proximity to the wall, a fireproof coating provided on the side facing the wall and a fireproof coating material provided from the side not facing the wall to the area where the fireproof coating is provided are provided. Therefore, the fireproof coating on the wall side of the steel member can be surely performed by the fireproof coating. Thus, it has the effect of surely performing the fireproof coating on the outer wall side of the steel beam.

[0013] In addition, according to another fireproof coating structure of the present invention, since the fireproof coating material is a wound-type fireproof coating material, it has the effect of being easily applied to the outside of the steel member.

[0014] In addition, according to another fireproof coating structure of the present invention, since it further includes a clip for fixing the end portion of the fireproof coating material on the side where the fireproof coating is provided to the steel member, even when the space between the wall and the steel member is narrow, the end portion of the fireproof coating material can be easily fixed to the steel member.

[0015] Moreover, according to the fireproof coating method of the present invention, which is a method of constructing the above-described fireproof coating structure, it includes a step of transporting a steel member with a fireproof paint previously provided on the side of the outer surface of the steel member facing the wall body to the construction site, and a step of applying a fireproof coating material from the side of the outer surface of the steel member that does not face the wall body to the area where the fireproof paint is to be provided at the construction site. Therefore, the fireproof coating on the wall body side of the steel member can be surely performed by the fireproof paint. Thus, it has the effect of surely performing the fireproof coating on the outer wall side of the steel beam.

Brief Description of the Drawings

[0016]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Embodiments for Carrying Out the Invention

[0017] The present invention is for surely performing the fireproof coating on the outer wall side of the outer peripheral steel member and ensuring the fireproof performance when the space between the outer peripheral steel member and the outer wall is narrow and the steel member cannot be covered with a fireproof coating, or when the country has not obtained the certification of the fireproof structure and the synthetic fireproof coating method cannot be applied.

[0018] Hereinafter, embodiments of the fireproof coating structure and its construction method according to the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited by this embodiment.

[0019] (Embodiment 1) First, Embodiment 1 of the present invention will be described. As shown in FIG. 1, the fireproof coating structure 10 according to Embodiment 1 of the present invention is applied to a steel beam 14 (steel member) disposed close to an outer wall 12 (wall body) that partitions an indoor area A and an outdoor area B. The outer wall 12 can be composed of, for example, a precast concrete plate, a lightweight foam concrete plate (ALC plate), an extruded cement plate (ECP), or the like. The steel beam 14 is made of an H-shaped steel having a web 16 and upper and lower flanges 18 and 20. A floor 22 such as concrete or ALC is provided on the upper surface of the upper flange 18 of the steel beam 14. An interlayer seal 24 (interlayer partitioning material) is provided between the floor 22 and the outer wall 12.

[0020] This fireproof coating structure 10 includes a fireproof paint 26 provided on the side of the outer surface of the steel beam 14 facing the outer wall 12, and a fireproof coating material 28 provided over the area where the fireproof paint 26 is installed from the side not facing the outer wall 12. Specifically, the fireproof paint 26 is continuously provided over a partial area from the edge of the upper flange 18 to the lower surface of the upper flange 18, the left side surface of the web 16, and the upper surface of the lower flange 20. On the other hand, the fireproof coating material 28 is continuously provided over a partial area from the lower surface of the floor 22 to the edge of the upper flange 18, the edge of the lower flange 20, the lower surface, the edge on the outer wall 12 side, and the upper surface. The ends of the fireproof paint 26 and the fireproof coating material 28 are overlapped with a predetermined overlap margin (for example, about several tens of mm). The end side of the fireproof coating material 28 is fixed by fixing pins 30 welded to the upper flange 18 and the lower flange 20.

[0021] The refractory coating 26 is a foaming type that foams and thickens upon heating. For example, a refractory coating mainly composed of ammonium polyphosphate can be used. In such a refractory coating, when heated during a fire, foaming starts at around 250°C, foams 20 - 30 times to form a heat insulation layer, and suppresses the temperature rise of the steel material. The refractory coating 26 is preferably pre-coated (pre-painted) in a factory such as a prefabricator on the surface of the steel material in a thickness unit of several millimeters to a dozen or so millimeters in advance.

[0022] The refractory covering material 28 is provided in the remaining range outside the pre-painting range of the refractory coating 26. For example, an inorganic refractory covering material such as heat-resistant rock wool can be used. As the refractory covering material 28, in order to improve workability, it is preferably a wound-type refractory covering material (hereinafter referred to as a wound refractory covering material) formed in a sheet shape and can be wound around the object to be covered, and it is desirable to construct it at the construction site. As such a wound refractory covering material, for example, there is Maki bee (registered trademark) made of a silicon oxide calcium oxide-based mineral fiber board covering material as a raw material.

[0023] When constructing this refractory covering structure 10, first, in a factory such as a prefabricator in advance, the refractory coating 26 is pre-coated on the surface of the steel frame beam 14 on the outer wall 12 side. Then, this steel frame beam 14 is transported to the construction site of the building and installed at the construction position near the outer wall 12. Next, the refractory covering material 28 is attached to the remaining part of the surface of the steel frame beam 14. In this way, the refractory covering structure 10 can be easily constructed. Also, the refractory covering on the outer wall 12 side of the steel frame beam 14 can be surely performed by the pre-coated refractory coating 26.

[0024] Therefore, according to the present embodiment, even if the space between the outer peripheral steel frame beam 14 and the outer wall 12 is narrow, it is possible to surely perform the fireproof coating on the outer wall 12 side of the outer peripheral steel frame beam 14 and ensure the fireproof performance. Further, even in a case where the factory has not obtained the certification of the fireproof structure and the synthetic fireproof coating method cannot be applied, it is possible to surely perform the fireproof coating on the outer wall 12 side of the outer peripheral steel frame beam 14 and ensure the fireproof performance. Furthermore, by pre-coating the fireproof paint 26 on the steel frame beam 14 at the factory, the fireproof coating work at the construction site can be labor-saving.

[0025] In the above embodiment, the case where the steel frame beam 14 is an H-shaped steel has been described as an example. However, the present invention is not limited to this, and any steel frame member that can be used for the steel frame beam may be used. For example, it may be composed of steel materials having other cross-sectional shapes. Even in this case, the same operational effects as described above can be achieved. Further, in the above embodiment, the case where the steel frame member is the steel frame beam 14 has been described as an example. However, the present invention is not limited to this, and a steel frame column may be used. The cross-sectional shape of the steel frame column may be any cross-sectional shape that can be used for the steel frame column. Even in this case, the same operational effects as described above can be achieved.

[0026] (Embodiment 2) Next, Embodiment 2 of the present invention will be described. As shown in FIG. 2(1), the fireproof coating structure 100 according to the present Embodiment 2 is fixed to the lower flange 20 using a metal clip 32 instead of fixing the end portion on the outer wall 12 side of the wound fireproof coating material 28 to the lower flange 20 with a retaining pin 30 in the above Embodiment 1. This embodiment is particularly effective when the space between the outer wall 12 and the steel frame beam 14 is narrow.

[0027] The metal clip 32 is a clip formed by bending a strip-shaped thin metal plate 34 into a substantially U shape, and has claw portions 40 that are bent at an acute angle from both ends of the U-shaped opening 36 toward the inner base portion 38. When fixing the refractory coating material 28 with this metal clip 32, the opening 36 is inserted so as to sandwich the refractory coating material 28 disposed at the mouth of the lower flange 20 from above and below, and is pressed in the closing direction. Then, the claw portions 40 bite into the refractory coating material 28 and abut against the lower flange 20, and the lower flange 20 is sandwiched from above and below. By doing so, the refractory coating material 28 on the outer wall 12 side can be easily and firmly fixed to the lower flange 20.

[0028] It is preferable to arrange a plurality of these metal clips 32 at predetermined intervals in the longitudinal direction of the steel beam 14. Note that the dimensions of the metal clip 32 can be set as appropriate, but in the present embodiment, a U-shaped one having a bandwidth of about 1 cm, an opening width of the opening 36 of about 4 cm, and a length from the base portion 38 to the opening 36 of about 4 cm is assumed. Further, the shape of the metal clip 32 is not limited to the above U shape, and any shape can be used as long as the refractory coating material 28 can be fixed to the lower flange 20.

[0029] (Effectiveness of the metal clip) Next, a fire resistance experiment conducted to confirm the effectiveness of the metal clip will be described. As test specimens for the fire resistance experiment, a test specimen as shown in Fig. 3(1) (Example of the present invention) and a comparative test specimen as shown in Fig. 3(2) (Comparative example) were used. The test specimen of this example is one in which the wound refractory coating material 28 is fixed to the lower flange 20 of the steel beam 14 with a metal clip 32 in combination with the refractory paint 26 and the wound refractory coating material 28. The comparative test specimen has a cross-sectional configuration in which only the wound refractory coating material 28 is used for fire resistance coating. The steel beam 14 has a cross-section of H-400×200×8×13 mm, the thickness of the wound refractory coating material 28 is 20 mm, and the thickness of the refractory paint 26 is 1.5 mm. The heating time was set to 1 hour. The temperature measurement results of this fire resistance experiment are shown in Fig. 4. Fig. 4(1) shows the temperature measurement results of the fire resistance coating method using the metal clip, and (2) shows the temperature measurement results of the fire resistance coating method using only the wound refractory coating material.

[0030] As shown in Fig. 4, in the fireproof coating method using a metal clip (Example) and the fireproof coating method using only a wound fireproof coating material (Comparative Example), the steel material temperature is generally the same, and it can be said that the metal clip method of this Example also has a fireproof performance equivalent to that of the coating with only the wound fireproof coating material.

[0031] As described above, according to the fireproof coating structure according to the present invention, among the outer surfaces of the steel frame members arranged opposite to each other close to the wall body, a fireproof paint provided on the side facing the wall body and a fireproof coating material provided in the region where the fireproof paint is provided from the side not facing the wall body are provided. Therefore, the fireproof coating of the steel frame member on the wall side can be surely performed by the fireproof paint. Therefore, the fireproof coating of the outer wall side of the steel beam can be surely performed.

[0032] Further, according to another fireproof coating structure according to the present invention, since the fireproof coating material is a wound type fireproof coating material, it can be easily constructed on the outside of the steel frame member.

[0033] Further, according to another fireproof coating structure according to the present invention, since it further includes a clip for fixing the end of the fireproof coating material on the side where the fireproof paint is provided to the steel frame member, even when the space between the wall body and the steel frame member is narrow, the end of the fireproof coating material can be easily fixed to the steel frame member.

[0034] Further, according to the fireproof coating method according to the present invention, it is a method of constructing the above-described fireproof coating structure, and includes a step of transporting a steel frame member having a fireproof paint previously provided on the side facing the wall body among the outer surfaces of the steel frame member to the construction site, and a step of constructing a fireproof coating material in the region where the fireproof paint is provided from the side not facing the wall body among the outer surfaces of the steel frame member at the construction site. Therefore, the fireproof coating of the steel frame member on the wall side can be surely performed by the fireproof paint. Therefore, the fireproof coating of the outer wall side of the steel beam can be surely performed.

Industrial Applicability

[0035] As described above, the fireproof coating structure and its construction method according to the present invention are useful when the space between the outer peripheral steel beam and the outer wall is narrow and the steel beam cannot be covered with a fireproof coating material, or when the fireproof structure has not been certified by the state and the synthetic fireproof coating method cannot be applied. In particular, it is suitable for reliably performing the fireproof coating on the outer wall side of the outer peripheral steel beam.

Explanation of Signs

[0036] 10,100 Fireproof coating structure 12 Outer wall (wall body) 14 Steel beam (steel member) 16 Web 18 Upper flange 20 Lower flange 22 Floor 24 Interlayer partition 26 Fireproof paint 28 Fireproof coating material 30 Retaining pin 32 Metal clip 34 Thin plate 36 Opening 38 Base 40 Claw part A Indoor B Outdoor

Claims

1. Among the outer surfaces of the steel frame members arranged opposite to and adjacent to the wall body, a fireproof paint provided on the side facing the wall body, a wound fireproof covering material provided over the region from the side not facing the wall body of the outer surface of the steel frame member to the region where the fireproof paint is provided, and a clip for fixing the end of the fireproof covering material on the side of the region where the fireproof paint is provided to the steel frame member, a fireproof covering structure comprising: The steel frame member is composed of an H-shaped steel having a web arranged opposite to the wall body, an upper flange, and a lower flange. The fireproof paint is continuously provided from the edge on the side facing the wall body of the upper flange to a partial region of the lower surface of the upper flange, the side surface of the web, and the upper surface of the lower flange. The fireproof covering material is continuously provided over the edge on the side not facing the wall body of the upper flange, the edge on the side not facing the wall body of the lower flange, the entire lower surface of the lower flange, the edge on the side facing the wall body of the lower flange, and a partial region of the upper surface of the lower flange. The ends of the fireproof paint and the fireproof covering material are overlapped with a predetermined overlapping margin on the upper surface of the lower flange. The clip is formed by bending a strip-shaped thin metal plate into a substantially U shape, and has a U-shaped opening and claw portions bent at an acute angle from both ends of the opening toward the inner base portion. The opening is inserted so as to sandwich the fireproof covering material arranged at the edge on the side facing the wall body of the lower flange from above and below. The claw portions bite into the fireproof covering material and abut against the lower flange, sandwiching the lower flange from above and below. A fireproof covering structure characterized by this.

2. A method for constructing the fireproof covering structure according to Claim 1, comprising: A step of transporting the steel frame member, on the outer surface of which the fireproof paint has been previously provided on the side facing the wall body, to the construction site; and a step of constructing the fireproof covering material over the region from the side not facing the wall body of the outer surface of the steel frame member to the region where the fireproof paint is provided at the construction site. A method for constructing a fireproof covering structure characterized by this.

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