Fire-resistant coating structure

Abstract

The present invention provides a fire-resistant coating structure that can suppress heating of the hole wall through which a pipe is inserted when a wood-based fire-resistant coating material is placed on the outside of the fire-resistant coating material. [Solution] The fire-resistant covering structure comprises a hole covering material (hole covering material 20, outer covering material 30) that covers the hole wall of a through hole 12H formed in the web 12 of the steel beam 10, a fire-resistant covering material (box-shaped covering material 40) that is positioned outside the hole covering material in the axial direction of the through hole 12H and is formed in a box shape surrounding the flange 14 and web 12 of the steel beam 10, a wood-based fire-resistant covering material (wood-based covering material 46) laminated on the outside of the fire-resistant covering material, through holes for pipe insertion formed in the hole covering material, fire-resistant covering material and wood-based fire-resistant covering material, respectively, and communicating with each other, and a wood-based covering material 50 that covers the hole wall of the through hole in the wood-based fire-resistant covering material.

Description

Technical Field

[0001] The present invention relates to a fire-resistant coating structure.

Background Art

[0002] The following Patent Document 1 shows a fire-resistant coating structure in which the outside of a fire-resistant coating layer covering a steel beam is formed of wood.

Prior Art Document

Patent Document

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] When the outside of a fire-resistant coating layer is formed of wood such as a wood fire-resistant coating material and a pipe is inserted therethrough, the hole wall of the insertion hole may be heated by the pipe or the flame that has entered between the pipe and the hole wall during a fire.

[0005] In consideration of the above fact, the present invention provides a fire-resistant coating structure capable of suppressing heating of the hole wall through which a pipe is inserted when a wood fire-resistant coating material is disposed outside a fire-resistant coating material.

Means for Solving the Problems

[0006] The fire-resistant coating structure according to claim 1 includes a hole coating material that covers the hole wall of a through hole formed in the web of a steel frame beam, a fire-resistant coating material that is disposed outside the hole coating material in the axial direction of the through hole and is formed in a box shape surrounding the flange and web of the steel frame beam, a wood fire-resistant coating material laminated outside the fire-resistant coating material, insertion holes for pipe insertion formed in the hole coating material, the fire-resistant coating material, and the wood fire-resistant coating material, respectively, and communicating with each other, and a wood part coating material that covers the hole wall of the insertion hole in the wood fire-resistant coating material.

[0007] According to the fire-resistant coating structure of claim 1, the holes in the through-holes of the wood fire-resistant coating material are covered with the coating material. Therefore, heating of the holes is suppressed during a fire. As a result, the fire resistance is higher compared to a configuration without a coating material.

[0008] The fire-resistant coating structure of claim 2 is the fire-resistant coating structure of claim 1, wherein the hole-covering material is arranged across the fire-resistant coating material arranged on both sides of the web and is laminated in the axial direction of the through-hole.

[0009] According to the fire-resistant coating structure of claim 2, since the hole coating material is laminated in the axial direction of the through hole, a cylindrical tube, which may be used when laminating in the radial direction of the through hole, is not required.

[0010] The fire-resistant coating structure of claim 3 is the fire-resistant coating structure of claim 1, wherein the hole-covering material comprises a cylindrical tube arranged across the fire-resistant coating material arranged on both sides of the web, and a coating material laminated on the outside of the tube in the radial direction of the through-hole.

[0011] The fire-resistant coating structure of claim 3 involves laminating the hole-covering material on the outside of a cylindrical tube, which makes it less likely for the hole-covering material to break in the axial direction of the through-hole compared to the case where it is laminated in the axial direction of the through-hole.

[0012] The fire-resistant covering structure of claim 4 is the fire-resistant covering structure of claim 1, wherein the hole covering material comprises a duct arranged across the fire-resistant covering material arranged on both sides of the web, and the wood covering material covering the inner circumferential surface of the duct.

[0013] In the fire-resistant coating structure of claim 4, the wood covering material that covers the wood layer of the fire-resistant coating material also covers the inner circumferential surface of the duct. In other words, the wood covering material and the hole covering material are formed integrally. As a result, fire resistance performance can be obtained in the axial direction of the through hole by the wood covering material.

[0014] The fire-resistant coating structure of claim 5 is the fire-resistant coating structure of claim 1, wherein the wood covering material includes a heat-expandable sheet that covers the hole wall.

[0015] In the fire-resistant coating structure of claim 5, a thermally expandable sheet is used as the wood coating material, so heat insulation is obtained by thermal expansion when heated. Furthermore, because it is a sheet material, it is easier to apply compared to spray-on materials.

[0016] The fire-resistant coating structure of claim 6 is the fire-resistant coating structure of claim 5, wherein a cylindrical steel plate is placed between the hole wall and the thermally expandable sheet, and the thermally expandable sheet is bonded to the steel plate.

[0017] In the fire-resistant coating structure of claim 6, the thermally expandable sheet is bonded to the steel plate, making it less likely to peel off compared to the case where the thermally expandable sheet is bonded to a wood-based fire-resistant coating material.

[0018] The fire-resistant coating structure of claim 7 is the fire-resistant coating structure of claim 1, wherein the wood coating material contains calcium silicate.

[0019] In the fire-resistant coating structure of claim 7, the coating material is calcium silicate, and therefore is harder and has higher dimensional stability than a thermally expandable sheet. [Effects of the Invention]

[0020] According to the present invention, when a wood-based fire-resistant coating material is placed on the outside of a fire-resistant coating material, heating of the hole wall through which the pipe is inserted can be suppressed. [Brief explanation of the drawing]

[0021] [Figure 1] These are cross-sectional views showing a common configuration in each embodiment of the fire-resistant covering structure of the present invention, where (B) is an elevation view of a steel beam in a side view, and (C) is a cross-sectional view taken along line CC in (A). [Figure 2] This is an enlarged cross-sectional view showing a fire-resistant coating structure according to the first embodiment of the present invention. [Figure 3A] This is an enlarged cross-sectional view showing a fire-resistant coating structure according to a second embodiment of the present invention. [Figure 3B]An enlarged cross-sectional view showing an example in which a reinforcing material is added to the fire-resistant coating structure according to the second embodiment of the present invention. [Figure 4] An enlarged cross-sectional view showing the fire-resistant coating structure according to the third embodiment of the present invention. [Figure 5] An enlarged cross-sectional view showing a modified example of the covering range of the wooden member covering material applied to the fire-resistant coating structure according to each embodiment of the present invention. [Figure 6] An enlarged cross-sectional view showing a modified example in which the tubular body is omitted in the wooden member covering material applied to the fire-resistant coating structure according to each embodiment of the present invention. [Figure 7] An enlarged cross-sectional view showing a modified example in which the wooden member covering material applied to the fire-resistant coating structure according to each embodiment of the present invention is formed of a calcium silicate fire-resistant coating board. [Figure 8] An enlarged cross-sectional view showing another modified example in which the wooden member covering material applied to the fire-resistant coating structure according to each embodiment of the present invention is formed of a calcium silicate fire-resistant coating board. [Mode for Carrying Out the Invention] [[ID=2OR]]

[0022] Hereinafter, the fire-resistant coating structure according to the embodiment of the present invention will be described with reference to the drawings. Components denoted by the same reference numerals in each drawing mean the same components. However, unless otherwise specified in the specification, each component is not limited to one, and a plurality of them may exist.

[0023] eAlso, the description of the configurations and reference numerals that overlap in each drawing may be omitted. Note that the present disclosure is not limited to the following embodiments, and appropriate changes can be made and implemented, such as omitting configurations, replacing with different configurations, and using a combination of one embodiment and various modified examples within the scope of the object of the present disclosure.

[0024] [First Embodiment] [Steel Beam] Figure 1 shows a configuration common to each embodiment (first to third embodiment) of the present invention. The steel beam 10 is an H-shaped steel beam having a web 12 and upper and lower flanges 14. A circular through-hole 12H for passing piping through is formed in this steel beam 10. Prior to inserting the piping through the through-hole 12H, the fire-resistant covering structure of the present invention is constructed in the steel beam 10.

[0025] The steel beam 10 supports the slab S. The fire-resistant covering structure according to the embodiment of the present invention is a structure for fire-covering both sides and the bottom surface of the steel beam 10 below the slab S. Furthermore, this fire-resistant covering structure is a structure for fire-covering the through-hole 12H formed in the steel beam 10.

[0026] <Fire-resistant coating structure> In the following description, the configuration common to each embodiment will be described first, followed by the configuration specific to the first embodiment. The fire-resistant covering structure, as a configuration common to each embodiment, includes a box-shaped covering material 40 and a wood-based covering material 46.

[0027] The box-shaped covering material 40 is an example of a fire-resistant covering material in the present invention. The wood-based covering material 46 is also an example of a wood-based fire-resistant covering material in the present invention.

[0028] (Box-shaped covering material) The box-shaped covering material 40 is a fire-resistant covering material that surrounds the flange 14 and web 12 of the steel beam 10 from three sides (sides and below). The box-shaped covering material 40 is formed by comprising side covering material 42 and bottom covering material 44. Calcium silicate fire-resistant covering boards are used as the material for forming the side covering material 42 and bottom covering material 44.

[0029] The side covering material 42 has through holes 42H formed therein. The through holes 42H are located coaxially with the through holes 12H of the steel beam 10.

[0030] The bottom covering material 44 is positioned below the flange 14 of the steel beam 10 and extends across the side covering materials 42 positioned on both sides of the steel beam 10.

[0031] In Figure 1(A), the bottom covering material 44 is positioned at a distance from the lower surface of the flange 14. The base material 18, which will be described later, is positioned in this separated area.

[0032] (wood covering material) The wood cladding material 46 is a wooden cladding material positioned outside the side cladding material 42 and the bottom cladding material 44, respectively. "Wooden" includes both laminated wood and solid wood.

[0033] The wood cladding material 46, which is in contact with the side cladding material 42, has through holes 46H formed therein that communicate with the through holes 42H of the side cladding material 42. The through holes 46H, like the through holes 42H, are arranged coaxially with the through holes 12H of the steel beam 10.

[0034] A base material 18 is welded to the underside of the upper flange 14 and the underside of the lower flange 14 of the steel beam 10. The wood cladding material 46 is fixed to this base material 18 using fasteners F2 such as coarse thread screws. In addition, the wood cladding material 46 that is in contact with the side cladding material 42 and the wood cladding material 46 that is in contact with the bottom cladding material 44 are also fixed using fasteners F2.

[0035] If the wood cladding material 46 is to be used as a finishing material (decorative material), it is preferable to conceal the top of the fastening material F2 with a wood plug or the like.

[0036] The wood-based cladding material 46 carbonizes when heated during a fire, thereby suppressing the spread of flames. By covering the box-shaped cladding material 40 with the wood-based cladding material 46 in this way, the fire resistance can be improved compared to when the wood-based cladding material 46 is not used.

[0037] (Arrangement of through holes) Multiple through-holes 12H are arranged along the front-to-back direction of the paper in Figure 1(A). Figure 1(B) shows a side view of the steel beam 10 covered with the box-shaped covering material 40 and the wood-based covering material 46. Figure 1(C) shows a plan section cut through the portion where the steel beam 10, the box-shaped covering material 40 and the wood-based covering material 46, the through-holes 12H, and the insertion holes 42H and 46H pass through.

[0038] As shown in these figures, adjacent through holes 46H are located in close proximity. In other words, through holes 12H (not shown in Figure 1(B)) located coaxially with the through holes 46H are located in close proximity.

[0039] "Proximity" means, for example, that the distance W1 between the centers of two insertion holes 46H is less than or equal to twice the diameter φ of the insertion hole 46H.

[0040] (hole covering material) Next, a configuration specific to the first embodiment will be described. The fire-resistant covering structure of the first embodiment is composed of a perforated covering material 20, an outer covering material 30, and a wood covering material 50.

[0041] The hole covering material 20 and the outer covering material 30 are stacked in the axial direction L of the through hole 12H and are arranged across the box-shaped covering material 40 located on both sides of the web 12 in the steel beam 10.

[0042] The hole covering material 20 comprises a first hole covering material 22 and a second hole covering material 24. The first hole covering material 22 is a fire-resistant covering material that covers the hole wall of the through hole 12H in the steel beam 10 and has the same thickness as the web 12. The first hole covering material 22 has an insertion hole 22H for inserting a pipe.

[0043] The through hole 22H is a circular hole when viewed from the direction along the axial direction L of the through hole 12H. Thus, the first hole covering material 22 is formed in an annular shape.

[0044] The second hole covering material 24 is positioned in contact with the first hole covering material 22 on the outside of the through hole 12H in the axial direction L, and is a fire-resistant covering material that covers the web surface 12 on the outer circumference of the through hole 12H. The second hole covering material 24 is positioned on both sides of the web 12.

[0045] Thus, in the hole covering material 20, the first hole covering material 22 and the second hole covering material 24 are laminated in the axial direction L of the through hole 12H. Furthermore, the first hole covering material 22 covers the hole wall of the through hole 12H, and the second hole covering material 24 covers the outer circumference of the through hole 12H. As a result, the hole covering material 20 provides fireproofing around the through hole 12H in the web 12.

[0046] The second hole covering material 24 is formed in a rectangular shape when viewed from a direction along the axial direction L of the through hole 12H. The second hole covering material 24 also has a through hole 24H for pipe insertion. The through hole 24H has the same diameter as the through hole 22H of the first hole covering material 22 and is coaxially positioned with respect to the through hole 22H.

[0047] The first hole covering material 22 and the second hole covering material 24 are formed using rock wool, AES (alkaline earth silicate), RCF (refractory ceramic fiber) blanket, etc. The first hole covering material 22 and the second hole covering material 24 are arranged in close contact with each other in a compressed state along the axial direction of the insertion holes 22H and 24H (i.e., the axial direction L of the through hole 12H).

[0048] The materials used to form the first hole covering material 22 and the second hole covering material 24 are not limited to rock wool, AES, and RCF blankets. However, it is preferable that the materials used to form them be materials that are resilient when compressed. "Resilient when compressed" means that the material undergoes elastic deformation when compressed and returns to its original shape when the compressive force is released.

[0049] Furthermore, while the first hole covering material 22 is a fire-resistant covering material with the same thickness as the web 12, the embodiments of the present invention are not limited to this. For example, the thickness of the first hole covering material 22 may be greater than that of the web 12. Even in such a case, the hole covering material 20, including the first hole covering material 22 and the second hole covering material 24, can fire-proof the area around the through-hole 12H in the web 12.

[0050] (outer covering material) The outer covering material 30 is a fire-resistant covering material laminated on the hole covering material 20 on the outside of the through hole 12H in the axial direction L. The outer covering material 30 is formed by comprising a covering material 32 that is in contact with the second hole covering material 24 and a covering material 34 that is in contact with the box-shaped covering material 40.

[0051] The covering materials 32 and 34 are formed in a rectangular shape when viewed from a direction along the axial direction L of the through hole 12H, similar to the second hole covering material 24.

[0052] The covering materials 32 and 34 have through holes 32H and 34H formed therein, which communicate with the through holes 22H and 24H of the perforated covering material 20. The through holes 32H and 34H have the same diameter as the through hole 22H and are arranged coaxially with the through hole 22H.

[0053] As the covering materials 32 and 34, commercially available plate-shaped materials such as calcium silicate fire-resistant covering boards are used. In order to obtain the desired thickness for the outer covering material 30, the covering materials 32 and 34 are arranged in layers. If a calcium silicate fire-resistant covering board of the desired thickness is available, the outer covering material 30 may be formed from a single calcium silicate fire-resistant covering board.

[0054] (Wood covering material) The wood covering material 50 is composed of a tubular body 52 and a heat-expandable sheet 54. The tubular body 52 is a cylindrical member formed, for example, from a galvanized steel sheet, and has a flange 52A at one end.

[0055] The tube body 52 covers the hole wall of the insertion hole 46H in the wood cladding material 46 over approximately its entire length. Furthermore, the outer surface of the tube body 52 is bonded to the inner wall of the insertion hole 46H. "Approximately the entire length" includes the range from approximately 10 mm shorter than the total length to the total length.

[0056] The flange 52A is a portion of the pipe body 52 that protrudes radially outward and is formed circumferentially. The flange 52A is positioned between the side covering material 42 and the wood covering material 46 in the box-shaped covering material 40.

[0057] The heat-expandable sheet 54 is adhered to the pipe 52 by adhesive tape, covering the pipe 52. As a result, the heat-expandable sheet 54 covers the wall of the insertion hole 46H in the wood covering material 46 over substantially its entire length, sandwiching the pipe 52. The heat-expandable sheet 54 may also partially cover the insertion hole 42H in the side covering material 42, as shown in Figure 2. Alternatively, the heat-expandable sheet 54 may not cover the insertion hole 42H at all.

[0058] The thermally expandable sheet 54 is, for example, a fire-resistant rubber sheet that expands when heated. The thermally expandable component contained in the rubber sheet foams up when heated, which can suppress the temperature rise of the bonded object.

[0059] <Mechanism and Effects> In the fire-resistant covering structure of this embodiment, the holes 46H of the wood covering material 46 are covered with a heat-expandable sheet 54 as a covering material. Therefore, heating of the holes is suppressed in the event of a fire. As a result, the fire resistance is higher compared to a configuration without the heat-expandable sheet 54.

[0060] For example, as indicated by the arrows in Figure 1(A), the through-hole 46H of the wood-based cladding material 46 and the surface of the wood-based cladding material 46, as well as the corner portion, are heated from two directions. In such a case, as shown in Figure 2, covering the through-hole 46H with a heat-expandable sheet 54 can suppress heating from one direction.

[0061] Furthermore, as shown by the arrows in Figure 1(C), the portion of the wood-based cladding material 46 sandwiched between two adjacent through-holes 46H is heated from three directions. In such a case, as shown in Figure 2, covering the through-holes 46H with a heat-expandable sheet 54 can suppress heating from two directions.

[0062] Furthermore, according to the fire-resistant coating structure of this embodiment, the hole coating material 20 and the outer coating material 30 are laminated in the axial direction L of the through hole 12H. Therefore, a cylindrical tube (for example, the tube 62 shown in Figure 3A, etc.) that may be used when laminating the coating material in the radial direction of the through hole 12H is not required.

[0063] Furthermore, according to the fire-resistant covering structure of this embodiment, the wood covering material 50 includes a heat-expandable sheet 54 that covers the holes 46H in the wood covering material 46. As a result, heat insulation is obtained when the heat-expandable sheet 54 expands due to heat. In addition, it is easy to install because it is a sheet material.

[0064] Furthermore, according to the fire-resistant coating structure of this embodiment, a cylindrical steel plate, which is a pipe 52, is placed between the hole wall of the insertion hole 46H in the wood-based coating material 46 and the thermally expandable sheet 54, and the thermally expandable sheet 54 is bonded to the pipe 52. As a result, it is less likely to peel off compared to when the thermally expandable sheet 54 is bonded to the wood-based coating material 46.

[0065] [Second Embodiment] <Fire-resistant coating structure> The configurations common to the first embodiment will be omitted from the explanation, and the configurations specific to the second embodiment will be described. As shown in Figure 3A, the fire-resistant covering structure of the second embodiment is composed of a perforated covering material 60 and a wood covering material 50.

[0066] (hole covering material) The hole covering material 60 comprises pipe bodies 62, 64, and covering materials 66 and 68.

[0067] The pipe body 62 is a cylindrical spiral duct made of, for example, galvanized steel sheet, and serves as a core material for wrapping the covering materials 66 and 68 around it from the radially outer side. The pipe body 62 is positioned inside the through-hole 12H in the steel beam 10 and is coaxial with the through-hole 12H. The pipe body 62 is also positioned across the side covering material 42 of the box-shaped covering material 40.

[0068] The pipe body 64 is a cylindrical member formed from, for example, galvanized steel sheet, and is equipped with a flange 64A at one end.

[0069] Two tubular bodies 64 are provided, each covering one end of the tubular body 62 from the radially inner side of the through hole 12H. The outer surface of the tubular body 64 is bonded to the inner surface of the tubular body 62. The flange 64A is a portion of the tubular body 64 that protrudes radially outward and is formed circumferentially. The flange 64A is positioned between the side covering material 42 and the wood covering material 46 in the box-shaped covering material 40.

[0070] The covering material 66 is formed by wrapping a sheet-like covering material around the pipe body 62 from the radially outer side of the through hole 12H. The covering material 66 is inserted through the through hole 12H of the steel beam 10 and is arranged across the side covering material 42 of the box-shaped covering material 40.

[0071] The covering material 68 is formed by wrapping a sheet-like covering material around the covering material 66 from the radially outer side. In other words, the covering materials 66 and 68 are stacked radially in the through hole 12H.

[0072] The covering material 68 is not inserted through the through-hole 12H of the steel beam 10, but is wrapped around the covering material 66 on both sides of the web 12. The covering material 68 is positioned in contact with the side covering material 42 of the box-shaped covering material 40. On the other hand, the covering material 68 is positioned at a distance from the web 12.

[0073] The covering materials 66 and 68 are formed using rock wool, AES (alkaline earth silicate), RCF (refractory ceramic fiber) blanket, etc.

[0074] (Wood covering material) The wood covering material 50 is composed of a pipe 52 and a heat-expandable sheet 54, similar to the first embodiment.

[0075] In this embodiment, the flange 52A is positioned between the side covering material 42 and the wood covering material 46 of the box-shaped covering material 40, and is positioned in contact with the flange 64A of the pipe body 64.

[0076] Furthermore, the heat-expandable sheet 54 covers the hole wall of the insertion hole 46H in the wood cladding material 46 over substantially its entire length, sandwiching the pipe body 52, and also covers the end of the pipe body 64.

[0077] (modified version) As shown in Figure 3B, a reinforcing member 16 may be fixed to the through hole 12H. The reinforcing member 16 is a steel material comprising an annular main body portion 16A inserted through the through hole 12H and a flange 16B protruding radially outward from the main body portion 16A.

[0078] The axial length of the main body 16A is greater than the thickness of the web 12. The flange 16B is welded to the web 12 along the outer circumference of the through hole 12H. The present invention can also be applied to a configuration using such a reinforcing member 16. Furthermore, the reinforcing member 16 may be applied to any embodiment other than this one.

[0079] <Mechanism and Effects> In the fire-resistant coating structure of this embodiment, the coating materials 66 and 68 constituting the hole coating material 60 are wrapped around the outside of cylindrical tubes 62 that are arranged across box-shaped coating materials 40 positioned on both sides of the web 12 of the steel beam 10, and are stacked radially across the through-hole 12H.

[0080] As a result, compared to the case where the coating material is laminated in the axial direction of the through-hole 12H, it is less likely that a break in the coating material will occur in the axial direction of the through-hole 12H.

[0081] [Third Embodiment] <Fire-resistant coating structure> The configurations common to the first embodiment will be omitted from the explanation, and the configurations specific to the third embodiment will be described. As shown in Figure 4, the fire-resistant covering structure of the second embodiment is composed of a perforated covering material 70 and a wood covering material 50.

[0082] (hole covering material) The hole covering material 70 comprises pipe bodies 72, 74 and a heat-expandable sheet 56.

[0083] The pipe body 72 is a cylindrical spiral duct formed, for example, from galvanized steel sheet. The pipe body 72 is positioned inside the through-hole 12H in the steel beam 10 and is coaxial with the through-hole 12H. The pipe body 72 is also positioned across the side covering material 42 of the box-shaped covering material 40.

[0084] The pipe body 74 is a cylindrical member formed from, for example, galvanized steel sheet, and is equipped with a flange 74A at one end.

[0085] Two tubular bodies 74 are provided, each covering one end of the tubular body 62 from the radially inner side of the through hole 12H. The outer surface of the tubular body 74 is bonded to the inner surface of the tubular body 72. The flange 74A is a portion of the tubular body 74 that protrudes radially outward and is formed circumferentially. The flange 74A is positioned between the side covering material 42 and the wood covering material 46 in the box-shaped covering material 40.

[0086] The thermally expandable sheet 56 covers the inner circumferential surfaces of the pipe body 74 and the pipe body 72. Furthermore, as will be described later, the thermally expandable sheet 56 covers the holes 46H of the insertion holes in the wood cladding material 46.

[0087] Thus, the thermally expandable sheet 56 is part of the pore covering material 70 and part of the wood covering material 50. In other words, the thermally expandable sheet 56 is part of the pore covering material 70 and part of the wood covering material 50.

[0088] The heat-expandable sheet 56, as part of the hole covering material 70, covers the inner circumferential surfaces of the pipe body 74 and the pipe body 72.

[0089] (Wood covering material) The wood covering material 50 is composed of a pipe 52 and a heat-expandable sheet 56, similar to the first embodiment.

[0090] In this embodiment, the flange 52A is positioned between the side covering material 42 and the wood covering material 46 of the box-shaped covering material 40, and is positioned in contact with the flange 74A of the pipe body 74.

[0091] Furthermore, the thermally expandable sheet 56 covers the hole wall of the insertion hole 46H in the wood cladding material 46 over almost its entire length, sandwiching the pipe body 52. ​​In other words, the thermally expandable sheet 56, as part of the wood cladding material 50, covers the hole wall of the insertion hole 46H in the wood cladding material 46 over almost its entire length.

[0092] <Mechanism and Effects> In the fire-resistant covering structure of this embodiment, the heat-expandable sheet 56 that covers the hole wall of the insertion hole 46H in the wood covering material 46 also covers the inner circumferential surface of the pipe body 72 in the hole covering material 70.

[0093] In other words, the wood covering material 50 that covers the wood-based covering material 46, which is the wood layer, is formed integrally with the hole covering material 70. This makes it possible to obtain fire resistance performance in the axial direction of the through-hole 12H by the thermally expandable sheet 56.

[0094] [Other embodiments] In each of the above embodiments, the pipe 52 covers the hole wall of the insertion hole 46H in the wood-based cladding material 46 over substantially its entire length. The thermally expandable sheet 54 also covers the hole wall of the insertion hole 46H in the wood-based cladding material 46 over substantially its entire length, sandwiching the pipe 52.

[0095] However, the embodiments of the present invention are not limited to these. For example, as shown in Figure 5, the pipe 52 and the thermally expandable sheet 54 only need to cover a "part" of the hole wall of the through hole 46H. In this case, the pipe 52 and the thermally expandable sheet 54 cover a part of the steel beam 10 near the web 12.

[0096] Furthermore, although the above embodiment includes a tubular body 52 for adhering the heat-expandable sheet 54, the embodiments of the present invention are not limited to this. For example, as shown in Figure 6, the tubular body 52 may be omitted. In this case, the heat-expandable sheet 54 can be attached to the hole wall of the insertion hole 46H with adhesive tape.

[0097] Even if the pipe body 52 is omitted, the thermally expandable sheet 54 only needs to cover "part" of the wall of the through hole 46H.

[0098] Furthermore, in the above embodiment, a pipe 52 and a heat-expandable sheet 54 are used as wood covering materials to cover the hole wall of the insertion hole 46H, but the embodiments of the present invention are not limited to this. For example, rock wool, calcium silicate fire-resistant covering board (hereinafter referred to as calcium silicate board), gypsum board, etc. may be used instead of the pipe 52 and the heat-expandable sheet 54.

[0099] For example, Figure 7 shows an example in which calcium silicate board 80 is used as the wood covering material. When using calcium silicate board 80, the diameter of the insertion hole 46H in the wood covering material 46 may be made larger than the diameter of the insertion hole 42H by the thickness of the calcium silicate board 80, so that its inner surface is flush with the insertion hole 42H of the side covering material 42.

[0100] In the example shown in Figure 7, the calcium silicate board 80 covers the entire length of the hole wall of the insertion hole 46H, but the arrangement of the calcium silicate board 80 is not limited to this. For example, as shown in Figure 8, the calcium silicate board 82 may cover only a "part" of the hole wall of the insertion hole 46H.

[0101] In this example, the length of the calcium silicate board 82 along the axial direction of the through hole 12H is shorter than the length of the calcium silicate board 82 along the radial direction of the through hole 12H. Therefore, it is easy to manufacture the plate-shaped calcium silicate board 82 by cutting it into an annular shape. Thus, the present invention can be implemented in various forms.

[0102] (Note) (((1))) A hole covering material that covers the hole wall of a through hole formed in the web of a steel beam, A fire-resistant covering material is positioned outside the hole covering material in the axial direction of the through hole, surrounding the flange and web of the steel beam and forming a box shape. A wood-based fire-resistant coating material is laminated on the outside of the aforementioned fire-resistant coating material, The hole covering material, the fire-resistant covering material, and the wood fire-resistant covering material each have through holes for inserting pipes that are in communication with each other, A wood covering material that covers the hole wall of the insertion hole in the aforementioned wood fire-resistant covering material, A fire-resistant coating structure equipped with this feature.

[0103] (((2))) The aforementioned hole covering material is Distributed across the fire-resistant coating material arranged on both sides of the web, and laminated in the axial direction of the through-hole, The fire-resistant coating structure described in (((1))).

[0104] (((3))) The aforementioned hole covering material is A cylindrical tube is positioned across the fire-resistant covering material arranged on both sides of the web, In the radial direction of the through hole, the covering material laminated on the outside of the pipe body, Equipped with, The fire-resistant coating structure described in (((1))).

[0105] (((4))) The aforementioned hole covering material is A duct is arranged across the fire-resistant covering material that is positioned on both sides of the web, The wooden covering material covers the inner circumferential surface of the duct, Equipped with, The fire-resistant coating structure described in (((1))).

[0106] (((5))) The aforementioned wood covering material is Includes a thermally expandable sheet covering the hole wall, A fire-resistant coating structure as described in any one of items (((1))) to (((4))).

[0107] (((6))) A cylindrical steel plate is placed between the hole wall and the thermally expandable sheet. The thermally expandable sheet is bonded to the steel plate. The fire-resistant coating structure according to claim 5.

[0108] (((7))) The aforementioned wood covering material is Contains calcium silicate, A fire-resistant coating structure as described in any one of items (((1))) to (((4))). [Explanation of symbols]

[0109] 10 Steel beams 12 Web 12H through hole 20 hole covering material 22 First hole covering material (hole covering material) 22H Through hole 24 Second hole covering material (hole covering material) 24H Through Hole 30 Outer covering material (hole covering material) 32 Covering material (pore covering material) 32H Through hole 34 Covering material (pore covering material) 40 Box-shaped sheathing material (fireproof sheathing material) 42 Side covering material (fireproof covering material) 42H Through hole 44 Bottom covering material (fireproof covering material) 46 Wood cladding (wood fireproof cladding) 46H Through hole 50 Wood covering material 52. Body (wooden covering material) 52A Flange 54. Thermally expandable sheet (wood covering material) 56. Thermally expandable sheets (wood covering material, hole covering material) 60 hole covering material 62 Pipe body (hole covering material) 64 Pipe body (hole covering material) 66 Covering material (hole covering material) 68 Covering material (hole covering material) 70 Hole covering material 72 Pipe body (hole covering material) 74 Pipe body (hole covering material) 80 Calcium silicate board (wood covering material) 82. Calcium silicate board (wood covering material)

Claims

1. A hole covering material that covers the hole wall of a through hole formed in the web of a steel beam, A fire-resistant covering material is positioned outside the hole covering material in the axial direction of the through hole, surrounding the flange and web of the steel beam and forming a box shape. A wood-based fire-resistant coating material is laminated on the outside of the aforementioned fire-resistant coating material, The hole covering material, the fire-resistant covering material, and the wood fire-resistant covering material each have through holes for inserting pipes that are in communication with each other, A wood covering material that covers the hole wall of the insertion hole in the aforementioned wood fire-resistant covering material, A fire-resistant coating structure equipped with this feature.

2. The aforementioned hole covering material is Distributed across the fire-resistant coating material arranged on both sides of the web, and laminated in the axial direction of the through-hole, The fire-resistant coating structure according to claim 1.

3. The aforementioned hole covering material is A cylindrical tube is positioned across the fire-resistant covering material arranged on both sides of the web, In the radial direction of the through hole, the covering material laminated on the outside of the pipe body, Equipped with, The fire-resistant coating structure according to claim 1.

4. The aforementioned hole covering material is A duct is arranged across the fire-resistant covering material that is positioned on both sides of the web, The wooden covering material covers the inner circumferential surface of the duct, Equipped with, The fire-resistant coating structure according to claim 1.

5. The aforementioned wood covering material is Includes a thermally expandable sheet covering the hole wall, The fire-resistant coating structure according to claim 1.

6. A cylindrical steel plate is placed between the hole wall and the thermally expandable sheet. The thermally expandable sheet is bonded to the steel plate. The fire-resistant coating structure according to claim 5.

7. The aforementioned wood covering material is Contains calcium silicate, The fire-resistant coating structure according to claim 1.

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