JP6065434B2 - Fireproof coating structure - Google Patents

Description

  The present invention relates to a fireproof covering structure for covering a structural member having a through hole.

  Structural materials such as steel beams are obliged to be coated with a fireproof coating material such as spray rock wool to a thickness greater than a specified thickness in order to avoid a temperature rise due to a fire or the like. Such a fireproof coating is the same for a structural member provided with a through-hole for inserting a duct for air conditioning or ventilation, equipment piping, etc. As with the part, it is coated with a fireproof coating material with a thickness greater than the specified thickness.

  As described above, when the fire-resistant coating is also applied to the through-hole at the same thickness as other parts, the fire-resistant coating material that covers the small-mouthed surface causes the through-hole to have an inner diameter that is twice the coating thickness in the diameter direction. Will be narrowed. For this reason, there exists a subject that the effective diameter of a through-hole becomes small and there exists a possibility that the duct, equipment piping, etc. which make desired diameter may not be penetrated.

  The present invention has been made in view of such conventional problems, and the object of the present invention is to ensure a larger effective diameter of the through hole provided in the structural member and to ensure fire resistance. It is to provide a fireproof coating structure.

In order to achieve such an object, the fireproof covering structure of the present invention is a fireproof covering structure in which a structural member having a through hole is covered with a fireproof covering material,
The small surface of the through hole, without being coated with the refractory coating material, Ri Contact reflectance than that of the small surface is high high reflectance material is provided,
The high reflectivity material provided on the fore edge surface is only a metal foil, and has a fireproof covering structure that is attached to the fore edge surface.
According to such a fireproof coating structure, the small diameter surface of the through hole is not covered with the fireproof coating material, so that it is possible to secure a larger effective diameter of the through hole. In addition, the small surface reflectance than that have the above small plane highly reflective material is provided, heat rays are reflected by the small surface even if exposed to a flame or the like. For this reason, heat is not easily transmitted from the small-mouthed surface even if it is not covered with a fireproof coating material, so that it is possible to secure a larger effective diameter of the through-hole provided in the structural member and also ensure fireproof performance. . Further, since heat is hardly transmitted from the facet by simply attaching a thin metal foil to the facet, it is possible to ensure fire resistance by a simple and inexpensive method. In addition, since the thin metal foil is affixed to the facet, it is possible to secure a larger effective diameter of the through hole.

Further, the fireproof coating structure of the present invention is a fireproof coating structure that covers a structural member having a through hole with a fireproof coating material,
The small surface of the through-hole is machined or processed so that the reflectance is high before Symbol small surface is applied,
The facet surface is a fireproof coating structure that has been subjected to any processing or treatment of polishing to increase reflectivity, application of a paint having high reflectivity, or welding of a metal material.
According to such a refractory coating structure, it is possible to apply heat or heat from the small edge surface only by applying any processing or treatment to the small edge surface such as polishing to increase the reflectance, coating with a high reflectance, or welding of a metal material. Is difficult to be transmitted and is not provided on the facet at all, so that it is possible to ensure a large effective diameter of the through hole.

In such a fireproof covering structure, the structural member is covered on at least one surface in the penetrating direction through which the through hole penetrates around the through hole in the portion of the structural member where the through hole is provided. It is desirable that a high heat capacity material having a larger heat capacity than the refractory coating material is provided so as to be able to conduct heat with the structural member.
According to such a fireproof covering structure, since the high heat capacity material is provided on the surface of at least one side of the portion of the structural member where the through hole is provided around the through hole, the through hole Since the heat transferred from the small facet is absorbed by the high heat capacity material, it is possible to suppress the temperature rise of the part where the through hole is provided.

In such a fireproof covering structure, it is desirable that the high heat capacity material is provided on the surface on the one side and the surface on the other side.
According to such a fireproof coating structure, since the high heat capacity material is provided on both surfaces in the direction in which the through hole penetrates, the heat transmitted from the small edge surface is It is possible to further suppress the temperature rise of the portion where the through hole is provided by being absorbed by the high heat capacity material provided on both surfaces.

In such a fireproof covering structure, it is preferable that the high reflectivity material covers the high heat capacity material.
According to such a fireproof covering structure, the high heat capacity material is covered with the high reflectivity material and is not exposed to the outside, and the heat ray is reflected by the high reflectivity material covering the high heat capacity material. Capacitance materials are not easily heated. For this reason, it is possible to efficiently absorb the heat transmitted from the facet by the high heat capacity material.

In such a fireproof covering structure, it is preferable that the high heat capacity material is provided along the small edge surface.
According to such a fireproof covering structure, the heat transmitted from the facet of the through hole is substantially flush with the facet along the facet before being transferred to the position of the structural member away from the through hole. Therefore, the region where the structural member is heated can be further reduced.

In such a fireproof coating structure, it is desirable that the high heat capacity material is covered with a low thermal diffusivity material having a lower thermal diffusivity than the fireproof coating material.
According to such a fireproof covering structure, since the low thermal diffusivity material covers the high heat capacity material, the high heat capacity material is not exposed to the outside. For this reason, since the high heat capacity material is not directly heated by the outside air, a flame or the like, it is possible to efficiently absorb the heat transmitted from the small surface by the high heat capacity material.

In such a fireproof covering structure, it is desirable that the high heat capacity material is in contact with a protrusion protruding from the structural member so as to allow heat conduction.
According to such a refractory coating structure, the projecting portion protruding from the structural member is in contact with the high heat capacity material so as to be able to conduct heat. Absorbed. For this reason, the high heat capacity material can absorb heat more efficiently.

  ADVANTAGE OF THE INVENTION According to this invention, it is possible to provide the fireproof coating structure which can ensure the fire resistant performance while ensuring the effective diameter of the through-hole provided in the structural member larger.

It is a front view which shows the steel beam used for this embodiment. It is AA sectional drawing of FIG. It is a longitudinal cross-sectional view which shows the state which gave the fireproof coating to the steel beam in which the through-hole was provided. It is a figure which shows the heat transfer of the steel beam by which the small facet was fireproof-coated. It is a longitudinal cross-sectional view which shows the fireproof coating structure of 1st Embodiment. It is a longitudinal cross-sectional view which shows the fireproof coating structure of 2nd Embodiment. It is a longitudinal cross-sectional view which shows the fireproof coating structure of 3rd Embodiment. It is a longitudinal cross-sectional view which shows the 1st modification of the fireproof coating structure of 3rd Embodiment. It is a longitudinal cross-sectional view which shows the 2nd modification of the fireproof covering structure of 3rd Embodiment. It is a longitudinal cross-sectional view which shows the 3rd modification of the fireproof coating structure of 3rd Embodiment. It is a longitudinal cross-sectional view which shows the 4th modification of the fireproof coating structure of 3rd Embodiment.

Hereinafter, embodiments according to the present invention will be described in detail with reference to the drawings.
In the following embodiment, an example in which the fireproof covering structure of the present invention is applied to a steel beam as a structural member of a steel structure building will be described.

  FIG. 1 is a front view showing a steel beam used in the present embodiment. 2 is a cross-sectional view taken along the line AA in FIG. In the following description, when the steel beam 10 is viewed from the front as shown in FIG. 1, the vertical direction is the vertical direction, the horizontal direction is the horizontal direction or the longitudinal direction, and the width direction of the flange is orthogonal to the paper surface. This direction is simply shown as the width direction or the through direction of the through hole.

<Fireproof structure of steel beam>
As shown in FIGS. 1 and 2, the steel beam 10 of the present embodiment is provided below the slab 20, and has a plate-like upper flange 12 and a lower flange 14 that are spaced apart from each other and face each other, This is an H-shaped steel in which a plate-like web 16 that connects the upper flange 12 and the lower flange 14 up and down at the center in the width direction is integrated. The web 16 is provided with a through-hole 18 penetrating in the width direction, that is, from the surface 16a on one side of the web 16 to the surface 16a on the other side in order to insert a duct for air conditioning or ventilation, a sleeve for piping, and the like. ing. The diameter of the through hole 18 of the present embodiment is an example in which the height of the steel beam 10, that is, the half of the so-called beam H H / 2.

  When fireproof coating is applied to a steel beam having a through hole, the small thickness of the through hole must also be covered with a specified thickness according to the Building Standards Act. For example, when the fireproof covering material 30 is spray rock wool (hereinafter referred to as rock wool), it is coated with a thickness of 25 mm for 1 hour fire resistance, 45 mm for 2 hour fire resistance, and 60 mm for 3 hour fire resistance. It is prescribed.

  FIG. 3 is a longitudinal sectional view showing a state in which a fire-resistant coating is applied to a steel beam provided with a through hole. FIG. 4 is a diagram showing the heat transfer of a steel beam having a small facet covered with a fireproof coating. In FIG. 4, the direction in which heat is transmitted is indicated by an arrow, and the magnitude of heat is indicated by the size of the arrow.

  When the steel beam 10 is subjected to a fireproof coating as prescribed, a fireproof coating having the same thickness (for example, d) as the other portions is formed also on the small face 18a of the through hole 18 as shown in FIG. In this case, when the steel beam 10 is exposed to a flame or the like, heat is transferred to the web 16 via the fireproof coating material on the small face 18a of the through hole 18 as shown in FIG. At this time, the heat transmitted to the web 16 is reduced through the fireproof covering material 30, and the temperature rise of the web 16 is suppressed. However, since the small hole surface 18a is covered with the fireproof coating material 30 over the entire circumference, the through hole 18 is effective by about twice the thickness of the fireproof coating material 30 from the inner diameter of the formed through hole 18. The diameter D becomes small. If the effective diameter D of the through hole 18 is reduced, the diameter of the pipe to be inserted must be reduced and the number of the through holes 18 must be increased, resulting in an increase in the number of pipes. Moreover, since it is necessary to increase the diameter of the through-hole 18 when trying to ensure a large effective diameter D in a state in which the fireproof coating having the same thickness as the other part is formed on the small face 18a of the through-hole 18, It is necessary to structurally reinforce the steel beam 10. Thus, it was difficult to increase the effective diameter D of the through hole 18 while ensuring fire resistance. Therefore, the fireproof coating structure according to the present invention ensures a larger effective diameter D of the through hole 18 and also ensures fireproof performance.

<First Embodiment>
FIG. 5 is a longitudinal sectional view showing the fireproof coating structure of the first embodiment.
As shown in FIG. 5, the fireproof covering structure of the first embodiment is a high-reflectance material that has a high reflectivity over the entire circumference on the small face 18 a of the through hole 18 of the steel beam 10 provided under the slab 20. 56 (for example, metal foil, such as aluminum foil and stainless steel foil) is affixed. Further, the bottom surface of the slab 20 to the lower surface of the lower flange 14 of the steel beam 10 is covered with rock wool 30 as a fireproof coating material except for the small face 18a to which the high reflectivity material 56 is attached. In the present embodiment, for example, the rock wool 30 having a thickness of about 60 mm is covered in accordance with the standard for 3-hour fire resistance in the Building Standard Law.

  In such a fireproof covering structure, the through-hole 18 is formed in the steel beam 10 in a factory or the like, and the high-reflectance material 56 may be attached to the small facet 18a. The high reflectivity material 56 may be affixed to the joined steel beam 10, or the high reflectivity material 56 may be affixed to the facet 18a after the rock wool 30 has been sprayed except for the facet 18a.

  According to the fireproof covering structure of the first embodiment, the high-reflectance material 56 having a high reflectivity is affixed to the small face 18a of the through hole 18 that is not covered with the rock wool 30, so that it is exposed to a flame or the like. When this is done, heat rays are reflected by the high reflectivity material 56. For this reason, heat is not easily transmitted from the small-mouthed surface 18a even if it is not covered with the rock wool 30, so that the effective diameter D of the through hole 18 provided in the web 16 of the steel beam 10 is ensured and fire resistance is also ensured. It is possible to secure.

  Moreover, since heat is hardly transmitted from the small facet 18a simply by sticking the high reflectivity material 56 to the small facet 18a, it is possible to ensure fire resistance performance by a simple and inexpensive method. Further, since the high reflectance material 56 is affixed to the facet 18a, the effective diameter D of the through hole 18 can be secured larger.

Second Embodiment
FIG. 6 is a longitudinal sectional view showing the fireproof covering structure of the second embodiment.
The fireproof covering structure of the second embodiment is subjected to a rust preventive treatment that does not reduce the reflectance after the small-faced surface 18a marked with a one-dot chain line in FIG. 6 is polished so that the reflectance is increased over the entire circumference. ing. In addition, it replaces with grinding | polishing and an antirust process, for example, the process by which a coating material with a high reflectance is applied, or the process by which a metal with a high reflectance is welded may be performed to the small face 18a.

Further, except for the small face 18a subjected to the above processing or processing, the lower side of the slab 20 to the lower surface of the lower flange 14 of the steel beam 10 is covered with rock wool 30 as a fireproof covering material. . In the present embodiment, for example, the rock wool 30 having a thickness of about 60 mm is covered in accordance with the standard for 3-hour fire resistance in the Building Standard Law.

  In such a fireproof covering structure, the through hole 18 is formed in the steel beam 10 in a factory or the like, and after processing or processing is performed to increase the reflectance on the small face 18a, the rock wool 30 is blown to the small face. The coating is applied except for 18a.

  According to the fireproof covering structure of the second embodiment, the facet 18a of the through hole 18 that is not covered with the rock wool 30 is processed or treated so as to have a high reflectance, so that it is exposed to a flame or the like. When heated, the heat rays are reflected. For this reason, heat is not easily transmitted from the small-mouthed surface 18a even if it is not covered with the rock wool 30, so that the effective diameter D of the through hole 18 provided in the web 16 of the steel beam 10 is ensured and fire resistance is also ensured. It is possible to secure.

<Third Embodiment>
FIG. 7 is a longitudinal sectional view showing the fireproof covering structure of the third embodiment.
As shown in FIG. 7, the fireproof covering structure of the third embodiment is a web 16 in which a through hole 18 is provided in a steel beam 10 in which a high reflectivity material 56 is bonded to a small face 18 a of a through hole 18. Of both sides, i.e., the surface 16a on both sides in the penetration direction through which the through hole 18 penetrates, is provided substantially flush with the fore edge surface 18a along the edge of the through hole 18 so as to surround the through hole 18. A high heat capacity material 50 having a larger heat capacity than the rock wool 30 as a fireproof covering material is provided. Here, as shown in Table 1, examples of the high heat capacity material 50 include mortar and gypsum.

  And the rock wool 30 is coat | covered except the surface of the center side of the through-hole 18 of the site | part where the high reflectance material 56 is affixed, and the high heat capacity material 50. FIG.

Table 1 is a table showing general thermophysical values (at high temperatures) of various materials.

  According to the fireproof covering structure of the third embodiment, the heat transmitted from the small edge surface 18a is reduced by the high reflectivity material 56 that covers the small edge surface 18a, and the steel beam 10 is penetrated around the through hole 18. Since the high heat capacity material 50 is provided on both surfaces 16a of the web 16 in which the holes 18 are provided in the penetration direction through which the through holes 18 pass, the heat transferred from the facet 18a is It is possible to suppress the temperature rise of the web 16 that is absorbed by the high heat capacity material 50 provided on the surface 16a and in which the through hole 18 is provided. Further, since the high heat capacity material 50 is provided so as to surround the through hole 18, the heat transferred in the entire circumference of the small-mouth surface 18 a is absorbed by the high heat capacity material 50, and the through hole 18 is provided. It is possible to effectively suppress the temperature rise of the web 16. At this time, since the high heat capacity material 50 is provided along the small face 18a and substantially flush with the small face 18a, the heat transmitted from the small face 18a of the through hole 18 is transmitted from the through hole 18 of the web 16. It is absorbed by the high heat capacity material 50 before being transmitted to a remote location. For this reason, the area | region where the web 16 is heated can be restrained smaller.

  FIG. 8 is a longitudinal sectional view showing a first modification of the fireproof covering structure of the third embodiment. FIG. 9 is a longitudinal sectional view showing a second modification of the fireproof covering structure of the third embodiment. FIG. 10 is a longitudinal sectional view showing a third modification of the fireproof covering structure of the third embodiment. FIG. 11: is a longitudinal cross-sectional view which shows the 4th modification of the fireproof covering structure of 3rd Embodiment.

  In the third embodiment, the example in which the high reflectivity material 56 is attached only to the small-mouthed surface 18a has been described. However, when the high heat capacity material 50 is exposed as shown in FIG. 7, for example, when exposed to a flame or the like. In addition, the high heat capacity material 50 itself is directly heated, which may reduce the efficiency of absorbing the heat of the web 16. For this reason, as shown in FIG. 8, it is desirable that the high reflectivity material 56 is also pasted on the surface 50a of the high heat capacity material 50 on the center side of the through hole 18 in the same manner as the facet surface 18a. In this case, since the high reflectivity material 56 covers the small edge surface 18a and the high heat capacity material 50, the high heat capacity material 50 is not exposed to the outside together with the small edge surface 18a. For this reason, the high heat capacity material 50 is not directly heated by the outside air, flame, or the like, and is also prevented from being heated by heat transmitted from other than the small-mouthed surface 18a, so that transmission of heat from the small-sized surface 18a is suppressed. At the same time, it is possible to more efficiently absorb the heat transmitted from the facet 18a by the high heat capacity material 50.

  In this way, the high heat capacity material 50 is provided on both surfaces 16a of the web 16 so as to surround the through hole 18 along the edge of the through hole 18, and the small facet 18a and the surface of the high heat capacity material 50 have a high reflectance. By covering with the material 56, it is possible to provide fire resistance equivalent to the state of being covered with the rock wool 30 in the same manner as other parts without being covered with the rock wool 30 so as to cover the facet 18a. is there. For this reason, it is possible to ensure a larger effective diameter of the through hole 18 and also ensure fire resistance.

  In the first modified example of the third embodiment, the example in which the high reflectance material 56 is pasted on the surface 50a on the center side of the through hole 18 of the high heat capacity material 50 in the same manner as the facet 18a has been described. This is not a limitation. For example, as shown in FIG. 9, the high heat capacity material 50 is disposed outside the edge of the through hole 18, and the low heat diffusivity material having a lower heat diffusivity than the fireproof coating material 30 is provided on the through hole 18 side of the high heat capacity material 50. 52 may be provided. In this case, since the low thermal diffusivity material 52 covers the high heat capacity material 50, the high heat capacity material 50 is not exposed to the outside. For this reason, the high heat capacity material 50 is not directly heated by the outside air, flame, or the like, and is also prevented from being heated by heat transmitted from other than the small-mouthed surface 18a, so that transmission of heat from the small-sized surface 18a is suppressed. At the same time, it is possible to more efficiently absorb the heat transmitted from the facet 18a by the high heat capacity material 50. At this time, the high reflectivity material 56 may be further adhered to the surface of the low thermal diffusivity material 52 on the center side of the through hole 18 in the same manner as the facet surface 18a.

  Further, as in the third modification of the third embodiment shown in FIG. 10, the high heat capacity material 50 is arranged outside the edge of the through hole 18, and the through hole 18 side of the high heat capacity material 50 is rock rock 30. It may be coated. In this case, the high-reflectance material 56 is simply attached to the small facet 18a, and the rock wool 30 is sprayed onto the steel beam 10 disposed outside the edge of the through-hole 18 so that the high-heat capacity material 50 Since the rock wool 30 can be provided on the through-hole 18 side, the construction is easy. And since the rock wool 30 is provided in the through-hole 18 side of the high heat capacity material 50, the high heat capacity material 50 is not directly heated by outside air, flames, etc., and is heated by the heat transmitted from other than the small facet 18a. Therefore, the high heat capacity material 50 can absorb the heat whose transmission from the small facet 18a is suppressed by the high reflectivity material 56 more efficiently.

  Further, as in the fourth example of the third embodiment shown in FIG. 11, a ring as a protrusion projecting in the width direction on both surfaces 16a of the web 16 having the high reflectivity material 56 attached to the facet surface 18a. The protrusion 54 may be provided so as to be able to conduct heat, and the annular protrusion 54 may be embedded in a mortar that is the high heat capacity material 50. In this case, since the area in contact with the high heat capacity material 50 is increased by providing the annular protrusion 54, the heat that has entered the web 16 from the facet surface 18a is easily transmitted to the high heat capacity material 50. High heat capacity material 50 absorbs heat more efficiently than the case where capacity material 50 is provided, and fireproof performance improves. For this reason, the high reflectivity material 56 affixed to the facet surface 18 a reduces the heat transfer from the facet surface 18 a, and the heat transferred from the facet surface 18 a is efficiently transferred by the annular protrusion 54 to the high heat capacity material 50. It is possible to suppress heat transfer in the web 16. Here, the projecting portion provided on the steel beam 10 has an annular shape. However, the present invention is not limited thereto, and ribs and rod-like projections arranged radially from the center of the through hole 18 are capable of heat conduction and have a high heat capacity material 50. As long as the contact area can be expanded, any form may be used.

  In the third embodiment and each of the modified examples, the description has been given of the example in which the high-reflectance material 56 is provided on the small face 18a. However, as in the second embodiment, the small face 18a has a high reflectance. The structure processed or processed may be sufficient.

  In the third embodiment and each modified example, the example in which the high heat capacity material 50 is provided on both surfaces of the web 16 has been described. However, the rock wool 30 is also applied to the small face 18a in the same manner as other parts of the steel beam 10. If the same fire resistance as that provided is obtained, the high heat capacity material 50 may be provided only on one surface of the web 16.

<Other embodiments>
In the above embodiment, the structural member is the steel beam 10. However, the present invention is not limited to this, and the structural member may be any structural member that has a surface that needs to be fireproofed and that has a through hole. For example, the present invention can be applied to other fireproof covering structural members using a metal material such as stainless steel or aluminum alloy. Moreover, in the said embodiment, although the shape of the structural member was made into the H shape, not only this but I shape and T shape may be sufficient.

  In the above embodiment, the fireproof covering 30 is sprayed rock wool. However, the present invention is not limited to this, and other fireproof covering materials such as ceramics and gypsum, felt-like material winding methods, plastering methods, etc. A fireproof coating material by a construction method other than the above may be used.

  The above embodiment is for facilitating the understanding of the present invention, and is not intended to limit the present invention. The present invention can be changed and improved without departing from the gist thereof, and it is needless to say that the present invention includes equivalents thereof.

DESCRIPTION OF SYMBOLS 10 Steel beam 12 Upper flange 14 Lower flange 16 Web 16a Surface 18 Through-hole 18a Small-mouthed surface 20 Slab 30 Fireproof covering material (rock wool)
50 High heat capacity material 50a Surface facing through hole 52 Low heat diffusion member 54 Annular protrusion 56 High reflectivity material

Claims (8)

A fireproof coating structure that covers a structural member having a through hole with a fireproof coating material,
The small surface of the through hole, without being coated with the refractory coating material, Ri Contact reflectance than that of the small surface is high high reflectance material is provided,
The high-reflectivity material provided on the small edge surface is only a metal foil, and is attached to the small edge surface. A fireproof coating structure that covers a structural member having a through hole with a fireproof coating material,
The small surface of the through-hole is machined or processed so that the reflectance is high before Symbol small surface is applied,
The fireproof coating structure is characterized in that the small facet is subjected to any processing or treatment of polishing to increase the reflectance, application of a paint having a high reflectance, or welding of a metal material. The fireproof covering structure according to claim 1 or 2,
The heat capacity of the structural member on the surface of at least one side in the penetrating direction through which the through hole penetrates is larger than that of the fireproof coating material that covers the structural member around the through hole in the portion where the through hole is provided in the structural member. A fireproof covering structure characterized in that a large high heat capacity material is provided so as to be able to conduct heat with the structural member. The fireproof covering structure according to claim 3,
The high heat capacity material is provided on the surface on the one side and the surface on the other side, respectively. The fireproof covering structure according to claim 3 or 4,
The high-reflectance material covers the high-heat capacity material. The fireproof covering structure according to any one of claims 3 to 5,
The fireproof covering structure, wherein the high heat capacity material is provided along the small edge surface. The fireproof covering structure according to claim 3 or 4,
The high heat capacity material is covered with a low thermal diffusivity material having a lower thermal diffusivity than the fire resistant coating material. The fireproof covering structure according to any one of claims 3 to 7,
The high heat capacity material has a fireproof covering structure in which a protrusion protruding from the structural member is in contact with the heat conductive material.