Fire-resistant coating structure

Abstract

To provide a fire-resistant coating structure that is less constrained by the order of construction. [Solution] The fire-resistant covering structure comprises a hole covering material 20 that covers the hole wall of a through hole 12H formed in the web 12 of the steel beam 10 and the web 12 on the outer circumference of the through hole 12H, an outer covering material 30 laminated on the hole covering material 20 on the axially outer side of the through hole 12H, and a box-shaped fire-resistant covering material (box-shaped covering material) 40 that surrounds the flange 14 and web 12 of the steel beam 10 and is positioned in contact with the outer covering material 30, with through holes formed in the hole covering material 20, the outer covering material 30 and the fire-resistant covering material, respectively, that communicate with each other.

Description

Technical Field

[0001] The present invention relates to a fireproof coating structure.

Background Art

[0002] The following Patent Document 1 describes a configuration in which a fireproof coating material is wound around a duct and inserted into a duct through-hole of a steel beam.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The fireproof coating materials of Patent Document 1 are laminated in the radial direction of the duct. Among these, the inner fireproof coating material is wound around the duct before inserting the duct into the duct through-hole, and the outer fireproof coating material is wound around the duct after inserting the duct into the duct through-hole. Thus, when laminating a plurality of fireproof coating materials in the radial direction of the duct and the duct through-hole, a duct as a winding target is required, so there are restrictions on the construction sequence.

[0005] In consideration of the above facts, the present invention provides a fireproof coating structure that is less restricted by the construction sequence.

Means for Solving the Problems

[0006] The fire-resistant covering structure according to claim 1 comprises a hole covering material that covers the hole wall of a through hole formed in the web of a steel beam and the web on the outer circumference of the through hole; an outer covering material laminated on the hole covering material on the axially outer side of the through hole; and a box-shaped fire-resistant covering material that surrounds the flange and web of the steel beam and is positioned in contact with the outer covering material, wherein the hole covering material, the outer covering material, and the fire-resistant covering material each have through holes for inserting pipes that communicate with each other.

[0007] According to the fire-resistant coating structure of claim 1, the hole covering material and the outer covering material are arranged in a stacked manner in the axial direction of the through-hole. Therefore, the through-hole can be fire-coated even without inserting a duct into the through-hole. In other words, the hole covering material and the outer covering material can be installed on the steel beam regardless of the presence or absence of a duct.

[0008] This makes it easier to form a fire-resistant coating, and reduces the constraints on the construction sequence, compared to, for example, a configuration where the covering material is wrapped around the duct, layered radially around the duct, and then passed through the penetration hole in the steel beam.

[0009] The fire-resistant coating structure of claim 2 is the fire-resistant coating structure of claim 1, wherein the hole covering material comprises an annular first hole covering material that covers the hole wall, and a second hole covering material that is positioned in contact with the first hole covering material on the axial outer side of the through hole and covers the web surface.

[0010] According to the fire-resistant coating structure of claim 2, the annular first hole covering material can be manufactured by cutting it from a plate-shaped member. Alternatively, it can be manufactured by cutting a plate-shaped member into a strip to the required thickness for covering the through hole, and then cutting it to the required length to match the circumference of the through hole. Furthermore, since the second hole covering material and the outer covering material are laminated, each can be formed from a plate-shaped member. Therefore, by changing the number of layers and the thickness of the plate-shaped members, it is easy to adjust the design size of the hollow section (the distance between the fire-resistant coating material and the web).

[0011] The fire-resistant coating structure of claim 3 is the fire-resistant coating structure of claim 1, wherein the hole covering material comprises a third hole covering material that covers the hole wall and protrudes to both sides of the web, and a fourth hole covering material that is laminated on the third hole covering material on the radially outer side of the through hole and covers the web surface.

[0012] According to the fire-resistant coating structure of claim 3, the third-hole coating material and the fourth-hole coating material are laminated in the radial direction of the through-hole. Therefore, the interface between the third-hole coating material and the fourth-hole coating material is aligned with the axial direction of the through-hole. This results in higher fire resistance compared to the case where the interface of each coating material is aligned only in the radial direction of the through-hole.

[0013] The fire-resistant coating structure of claim 4 is the fire-resistant coating structure according to any one of claims 1 to 3, wherein at least one of the hole covering material and the outer covering material is arranged in a compressed state along the axial direction of the through hole.

[0014] According to the fire-resistant coating structure of claim 4, compared to a configuration in which at least one of the perforated coating material and the outer coating material is not compressed, gaps are less likely to form at the interface between each coating material, resulting in higher fire resistance.

[0015] The fire-resistant coating structure of claim 5 is the fire-resistant coating structure of claim 1, wherein the outer coating material and the fire-resistant coating material are fixed to each other by a fastening material.

[0016] According to the fire-resistant coating structure of claim 5, compared to a configuration without fastening materials, the outer coating material and the fire-resistant coating material are less likely to shift, resulting in higher fire resistance.

[0017] The fire-resistant coating structure of claim 6 is the fire-resistant coating structure of claim 1, wherein the end faces of the upper and lower flanges of the steel beam and the fire-resistant coating material are separated.

[0018] According to the fire-resistant coating structure of claim 6, a gap is formed between the fire-resistant coating material and the steel beam, making it easy to conceal structures and piping around the beam inside the fire-resistant coating material.

[0019] The fireproof coating structure according to claim 7 is the fireproof coating structure according to claim 1, wherein a receiving member is disposed between the outer coating material and the lower flange of the steel beam, or the outer coating material is placed on the lower flange of the steel beam.

[0020] According to the fireproof coating structure of claim 7, since the outer coating material is placed on the lower flange via the receiving member or directly, the vertical position can be fixed during the construction of the outer coating material.

[0021] The fireproof coating structure according to claim 8 is the fireproof coating structure according to claim 2, wherein a plurality of through holes are formed in the web, the first hole coating material is provided for each through hole, and a plurality of the insertion holes are formed in the second hole coating material and the outer coating material.

[0022] According to the fireproof coating structure of claim 8, a plurality of insertion holes are formed in the second hole coating material and the outer coating material. Therefore, the number of the second hole coating material and the outer coating material is smaller than that in the configuration where the second hole coating material and the outer coating material are provided for each through hole, and the construction is easy.

[0023] The fireproof coating structure according to claim 9 is the fireproof coating structure according to claim 2, wherein the first hole coating material is divided into a plurality of parts in the circumferential direction.

[0002] 6> According to the fireproof coating structure of claim 9, the yield when taking the first hole coating material from the plate material is better than that in the configuration where the first hole coating material is not divided into a plurality of parts.

[0025] The fireproof coating structure according to claim 10 is the fireproof coating structure according to claim 1, wherein the fireproof coating material is formed of a plurality of layers.

[0026] According to the fireproof coating structure of claim 10, the fireproof performance can be enhanced as compared with the case where the fireproof coating material is a single layer.

Advantages of the Invention

[0027] According to the present invention, it is difficult to be restricted by the construction sequence.

Brief Description of the Drawings

[0028] [Figure 1] This is an exploded perspective view showing an example of a fire-resistant coating structure according to an embodiment of the present invention. [Figure 2] (A) is a cross-sectional view showing a fire-resistant covering structure according to an embodiment of the present invention as viewed from the longitudinal direction of a beam, and (B) is a cross-sectional view taken along line BB in (A). [Figure 3] This is a cross-sectional view showing a modified example of a fire-resistant coating structure according to an embodiment of the present invention, in which a reinforcing member is placed in a through-hole. [Figure 4] This is a perspective view showing a modified example of a fire-resistant coating structure according to an embodiment of the present invention, in which the hole-covering material is laminated in the radial direction of the through-hole. [Figure 5] This is a cross-sectional view showing a modified example of a fire-resistant coating structure according to an embodiment of the present invention, in which the hole-covering material is laminated in the radial direction of the through-hole. [Figure 6] This is a cross-sectional view showing a modified example of a fire-resistant covering structure according to an embodiment of the present invention, in which a wood covering material is used. [Figure 7] This is a perspective view showing a modified example of the fire-resistant coating structure according to an embodiment of the present invention, in which a plurality of insertion holes are formed in the outer coating material. [Figure 8] This is a perspective view showing an example of a circular covering material in a fire-resistant covering structure according to an embodiment of the present invention. [Modes for carrying out the invention]

[0029] Hereinafter, a fire-resistant coating structure according to an embodiment of the present invention will be described with reference to the drawings. Components indicated by the same reference numerals in each drawing are considered to be the same component. However, unless otherwise specified in the specification, each component is not limited to one, and there may be multiple such components.

[0030] Furthermore, explanations of redundant components and reference numerals in each drawing may be omitted. This disclosure is not limited to the following embodiments, and modifications can be made as appropriate within the scope of the purpose of this disclosure, such as omitting components, substituting them with different components, or combining one embodiment with various modifications.

[0031] <Steel beam> Figure 1 shows an exploded perspective view of a fire-resistant covering structure according to an 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.

[0032] <Fire-resistant coating structure> As shown in Figure 2(A), 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.

[0033] As shown in Figure 1, the fire-resistant covering structure is composed of a perforated covering material 20, an outer covering material 30, and a box-shaped covering material 40.

[0034] (hole covering material) The hole covering material 20 comprises a first hole covering material 22 and a second hole covering material 24.

[0035] The first hole covering material 22 covers the hole wall of the through hole 12H in the steel beam 10 and is a fire-resistant covering material with the same thickness as the web 12. The first hole covering material 22 has an insertion hole 22H for inserting a pipe.

[0036] The through hole 22H is a circular hole when viewed from a direction along the axial direction L of the through hole 12H, and is located coaxially with the through hole 12H. In this way, the first hole covering material 22 is formed in an annular shape.

[0037] As shown in Figure 2(A), 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.

[0038] In this manner, the hole covering material 20 consists of a first hole covering material 22 and a second hole covering material 24, which are stacked in the axial direction L of the through hole 12H. The first hole covering material 22 covers the hole wall of the through hole 12H, and the second hole covering material 24 covers the web surface 12 on the outer periphery of the through hole 12H. As a result, the hole covering material 20 provides fireproofing around the through hole 12H in the web 12.

[0039] 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.

[0040] 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 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).

[0041] 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.

[0042] Furthermore, as shown in Figure 1, the first hole covering material 22 and the second hole covering material 24 are divided into multiple parts in the circumferential direction of the insertion hole 22H. The first hole covering material 22 and the second hole covering material 24 are formed by arranging these divided members in contact with each other in the circumferential direction of the insertion hole 22H and bonding them together.

[0043] For example, the first hole covering material 22 is divided into three sections in the circumferential direction of the insertion hole 22H. The second hole covering material 24 is divided into two sections in the circumferential direction of the insertion hole 22H. The number of these divisions is not particularly limited, but from the viewpoint of yield and workability, it is preferable to divide it into two to eight sections.

[0044] (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.

[0045] 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.

[0046] 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 (see Figure 2(A)). The through holes 32H and 34H have the same diameter as the through hole 22H and are arranged coaxially with the through hole 22H.

[0047] 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.

[0048] The covering materials 32 and 34 are divided into multiple parts in the circumferential direction of the insertion hole 32H. Furthermore, the covering materials 32 and 34 are formed by arranging these divided members in contact with each other in the circumferential direction of the insertion hole 32H and bonding them together.

[0049] Of the first hole covering material 22, second hole covering material 24, covering materials 32 and 34, which are stacked on top of each other, two adjacent pieces are arranged so that their joint positions do not coincide. For example, covering material 32 has a vertical joint that divides it horizontally. On the other hand, covering material 34 has a horizontal joint that divides it vertically. These vertical and horizontal joints are misaligned when viewed from a direction along the axial direction of the through hole 32H.

[0050] A support member 36 is positioned between the covering material 34 and the flange 14 of the steel beam 10. The support member 36 is a spacer that positions the covering material 34 in the vertical direction and is formed using a calcium silicate fire-resistant covering plate.

[0051] In Figure 2, the support member 36 is positioned below the covering material 34. However, the thickness of the support member 36 (thickness along the axial direction L of the through hole 12H) may be increased and it may be positioned below the covering materials 32 and 34. Also, the width of the support member 36 as viewed from the direction along the axial direction L of the through hole 12H may be smaller than or the same as that of the covering material 34.

[0052] Furthermore, as shown in Figure 2, gaps are formed between the outer covering material 30 and the upper and lower flanges 14 of the steel beam 10, but the embodiments of the present invention are not limited to this.

[0053] The outer covering material 30 may be placed in contact with either or both of the upper and lower flanges 14. For example, the outer covering material 30 may be placed on top of the lower flange 14. Similarly, the second hole covering material 24 may be placed in contact with either or both of the upper and lower flanges 14.

[0054] (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.

[0055] The side covering material 42 is positioned in contact with the covering material 34 of the outer covering material 30. The side covering material 42 has through holes 42H formed in it. The through holes 42H are through holes that communicate with the through holes 22H and 24H of the hole covering material 20 and the through holes 32H and 34H of the outer covering material 30. The through holes 42H have the same diameter as the through holes 22H and are positioned coaxially with the through holes 22H.

[0056] The side covering material 42 and the end faces of the upper and lower flanges 14 on the steel beam 10 are separated. In other words, a gap is formed between the side covering material 42 and the end faces of the flanges 14.

[0057] As shown in Figure 1, a retaining member 48 may be provided between the side covering material 42 and the web 12. The retaining member 48 is fixed to the side covering material 42. The retaining member 48 is a member that maintains the distance between the side covering material 42 and the web 12 in the longitudinal direction of the steel beam 10 in the portion where the second hole covering material 24, covering materials 32 and 34 are not present. Multiple retaining members 48 are provided along the longitudinal direction of the steel beam 10.

[0058] 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. In Figure 2, the bottom covering material 44 is positioned at a distance from the lower surface of the flange 14. However, the embodiments of the present invention are not limited to this, and the bottom covering material 44 may be positioned in contact with the lower surface of the flange 14.

[0059] (Fastening material) The side covering material 42 and the outer covering material 30 are fixed to each other using fasteners F1 such as coarse thread screws. The fasteners F1 are screwed in from the outside of the side covering material 42, penetrate the side covering material 42 and the covering material 34, and their tips are located inside the covering material 32.

[0060] Furthermore, the fastening member F1 may also penetrate the covering material 32, with its tip positioned inside the second hole covering material 24. This helps to suppress misalignment of the second hole covering material 24.

[0061] Alternatively, the fastening member F1 may penetrate the side covering material 42, with its tip located inside the covering material 34. In this case, an additional fastening member may be provided that penetrates the covering material 34 and has its tip located inside the covering material 32.

[0062] <Mechanism and Effects> In the fire-resistant coating structure according to the embodiment of the present invention, the hole covering material 20 and the outer covering material 30 are arranged in a stacked manner along the axial direction L of the through-hole 12H. Therefore, the through-hole 12H can be fire-coated even without inserting a duct into the through-hole 12H. In other words, the hole covering material 20 and the outer covering material 30 can be installed on the steel beam 10 regardless of the presence or absence of a duct.

[0063] This makes it easier to form a fire-resistant coating, and reduces the constraints on the construction sequence, compared to, for example, a configuration where the covering material is wrapped around the duct, layered radially around the duct, and then passed through the penetration hole in the steel beam.

[0064] Furthermore, in this fire-resistant covering structure, the annular first hole covering material 22 can be manufactured by cutting it from a plate-shaped member. Alternatively, it can be manufactured by cutting a plate-shaped member into a strip to the required thickness for covering the through hole 12H, and then cutting it to the required length to match the circumference of the through hole 12H. In addition, since the second hole covering material 24 and the outer covering material 30 are laminated in the axial direction of the through hole 12H, each can be formed from a plate-shaped member. Therefore, by changing the number of layers and the thickness of the plate-shaped members, it is easy to adjust the design size of the hollow section (the distance between the box-shaped covering material 40 and the web 12).

[0065] In contrast, if, for example, a cylindrical covering material having an axial length equal to the thickness of the first hole covering material 22, the second hole covering material 24, and the outer covering material 30 is provided, it is necessary to manufacture a covering material that matches the inner diameter of the through hole 12H and the outer diameter of the pipe.

[0066] Furthermore, in this fire-resistant coating structure, the first hole coating material 22 and the second hole coating material 24 of the hole coating material 20 are arranged in close contact with each other while compressed along the axial direction of the insertion holes 22H and 24H. As a result, compared to a configuration in which the first hole coating material 22 or the second hole coating material 24 is not compressed, gaps are less likely to occur at the interface of each coating material, resulting in higher fire resistance.

[0067] Furthermore, in this fire-resistant covering structure, the outer covering material 30 and the side covering material 42 of the box-shaped covering material 40 are fixed to each other by fastening material F1. As a result, compared to a configuration without fastening material F1, the outer covering material 30 and the box-shaped covering material 40 are less likely to shift, resulting in higher fire resistance.

[0068] Furthermore, in this fire-resistant covering structure, the end faces of the upper and lower flanges 14 of the steel beam 10 are separated from the side covering material 42 of the box-shaped covering material 40. As a result, a gap is formed between the side covering material 42 and the steel beam 10, making it easier to conceal structures and piping around the steel beam 10 inside the box-shaped covering material 40.

[0069] Furthermore, in this fire-resistant covering structure, a support member 36 is positioned between the outer covering material 30 and the lower flange 14 of the steel beam 10. Alternatively, the outer covering material 30 rests on the lower flange 14 of the steel beam 10. This allows the vertical position of the outer covering material 30 to be fixed during installation.

[0070] Furthermore, in this fire-resistant coating structure, as shown in Figure 1, the first-hole coating material 22, the second-hole coating material 24, and the coating materials 32 and 34 are divided into multiple parts in the circumferential direction. This results in a better yield when taking material from the sheet material compared to a configuration that is not divided.

[0071] <Other Embodiments> (Variation 1) In the above embodiment, the first hole covering material 22 is a fire-resistant covering material with the same thickness as the web 12, but 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.

[0072] Furthermore, as shown in Figure 3, for example, 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.

[0073] 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.

[0074] When the reinforcing member 16 is provided in this manner, the thickness of the first hole covering material 22 may be formed to be equal to the axial length of the main body portion 16A. Thus, the present invention can also be applied to a steel beam 10 having a through hole 12H with the reinforcing member 16 provided.

[0075] (Modification 2) In the above embodiment, the hole covering material 20 consists of a first hole covering material 22 and a second hole covering material 24, which are laminated in the axial direction L of the through hole 12H. However, the embodiments of the present invention are not limited to this.

[0076] For example, the hole covering material of the present invention may be laminated in the radial direction of the through hole 12H, as shown in Figures 4 and 5, with the third hole covering material 52 and the fourth hole covering material 54 of the hole covering material 50.

[0077] The third hole covering material 52 is a cylindrical fire-resistant covering material that covers the hole wall of the through hole 12H, forming an insertion hole 52H, and protruding from both sides of the web 12. The fourth hole covering material 54 is a cylindrical fire-resistant covering material that is positioned radially outside the through hole 12H, in contact with (wrapped around) the third hole covering material 52, and covers the surface of the web 12.

[0078] It is preferable that the third-hole covering material 52 and the fourth-hole covering material 54 are also formed from a material that is resilient when compressed, similar to the first-hole covering material 22 and the second-hole covering material 24.

[0079] In this way, by laminating the third-hole covering material 52 and the fourth-hole covering material 54 in the radial direction of the through-hole 12H, the interface between the third-hole covering material 52 and the fourth-hole covering material 54 is aligned with the axial direction L of the through-hole 12H. Therefore, the fire resistance is higher compared to the case where the interface of each covering material is aligned only in the radial direction of the through-hole 12H.

[0080] (Variation 3) The box-shaped covering material 40 in the above embodiment has a single-layer structure consisting of a side covering material 42 and a bottom covering material 44, but the embodiments of the present invention are not limited to this. For example, as shown in Figure 6, the box-shaped covering material 40 may be formed of multiple layers.

[0081] In this example, the box-shaped covering material 40 is provided with wood-based covering material 46 on the outside of the side covering material 42 and the bottom covering material 44.

[0082] The wood-based covering material 46, which is in contact with the side covering material 42, has through holes 22H and 24H of the perforated covering material 20, through holes 32H and 34H of the outer covering material 30, and an insertion hole 46H that connects to the through hole 42H of the side covering material 42.

[0083] 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.

[0084] 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.

[0085] The wood-based cladding material 46 carbonizes when heated during a fire, thereby suppressing the spread of flames. By forming the box-shaped cladding material 40 in multiple layers in this way, fire resistance can be improved compared to the case of a single layer. When forming the box-shaped cladding material 40 in multiple layers, an inorganic material such as calcium silicate may be used instead of the wood-based cladding material 46.

[0086] (Modification 4) In the above embodiment, one through hole 24H, 32H, and 34H are formed in the second hole covering material 24 and the covering materials 32 and 34 of the outer covering material 30, respectively, but the embodiments of the present invention are not limited thereto.

[0087] For example, as shown in Figure 7, if multiple through holes 12H are provided in close proximity in the web 12, multiple insertion holes 24H, 32H, and 34H corresponding to the through holes 12H may be formed in the second hole covering material 24 and the covering materials 32 and 34 of the outer covering material 30, respectively.

[0088] Thus, by forming multiple through holes 24H, 32H, and 34H in the second hole covering material 24, covering materials 32, and 34, it is easier to install as it requires less material compared to the case where a second hole covering material 24, covering materials 32, and 34 are provided for each through hole 12H.

[0089] (Variation 5) In the above embodiment, the second hole covering material 24 and the outer covering material 30 (covering materials 32 and 34) are formed in a rectangular shape when viewed from a direction along the axial direction of the through hole 12H, but the embodiments of the present invention are not limited to this.

[0090] For example, the second hole covering material 24 and the outer covering material 30 (covering materials 32 and 34) may be formed in a circular shape when viewed from a direction along the axial direction L of the through hole 12H, as shown in the covering material 60 in Figure 8.

[0091] The covering material 60, which is formed in a circular shape in this way, may also be formed by dividing it in the circumferential direction. In this case, each divided part may be joined together with adhesive, or it may be fixed using a binding material 62 such as wire or strip material.

[0092] (Other variations) In the above embodiment, the pore covering material 20 is made of a material that is resilient when compressed, and the outer covering material 30 is made of a plate-like material such as a calcium silicate fire-resistant covering board, but the embodiments of the present invention are not limited thereto.

[0093] For example, the outer covering material 30 may also be made of a material that is resilient when compressed, similar to the perforated covering material 20. Alternatively, the perforated covering material 20 may be made of a plate-like material such as a calcium silicate fire-resistant covering board, and the outer covering material 30 may be made of a material that is resilient when compressed.

[0094] Furthermore, in the above embodiment, the outer covering material 30 was configured as a two-layer structure using covering materials 32 and 34, but the embodiments of the present invention are not limited to this. The outer covering material 30 may be composed of three or more layers, or it may be a single-layer structure.

[0095] Furthermore, in the above embodiment, the end faces of the upper and lower flanges 14 of the steel beam 10 and the side covering material 42 of the box-shaped covering material 40 are spaced apart, but the embodiments of the present invention are not limited to this. For example, the end faces of the flanges 14 and the side covering material 42 may be arranged in contact with each other. The distance between the end faces of the flanges 14 and the side covering material 42 can be determined as appropriate. Thus, the present invention can be implemented in various forms.

[0096] (Note) (((1))) A hole covering material that covers the hole wall of a through hole formed in the web of a steel beam and the outer circumference of the web of the through hole, An outer covering material laminated on the hole covering material on the axially outer side of the through hole, A box-shaped fire-resistant covering material is positioned surrounding the flange and web of the steel beam and in contact with the outer covering material, Equipped with, The hole covering material, the outer covering material, and the fire-resistant covering material each have through holes for inserting pipes that are in communication with each other. Fire-resistant coating structure.

[0097] (((2))) The aforementioned hole covering material is An annular first hole covering material that covers the hole wall, A second hole covering material is positioned on the axial outer side of the through hole, in contact with the first hole covering material, and covers the web surface. It is equipped with The fire-resistant coating structure described in (((1))).

[0098] (((3))) The aforementioned hole covering material is A third hole covering material covers the hole wall and protrudes from both sides of the web, A fourth hole covering material is laminated on the third hole covering material on the radially outer side of the through hole to cover the web surface, It is equipped with The fire-resistant coating structure described in (((1))).

[0099] (((4))) At least one of the hole covering material and the outer covering material is The through hole is positioned in a compressed state along its axial direction. A fire-resistant coating structure as described in any one of items (((1))) to (((3))).

[0100] (((5))) The outer covering material and the fire-resistant covering material are fixed to each other with fasteners. A fire-resistant coating structure as described in any one of items (((1))) to (((4))).

[0101] (((6))) The end faces of the upper and lower flanges of the steel beam and the fire-resistant covering material are separated. A fire-resistant coating structure as described in any one of items (((1))) to (((5))).

[0102] (((7))) A support member is positioned between the outer covering material and the lower flange of the steel beam. Or, The outer covering material is placed on the lower flange of the steel beam. A fire-resistant coating structure as described in any one of items (((1))) to (((6))).

[0103] (((8))) Multiple through holes are formed in the web. The first hole covering material is provided for each of the through holes. The second hole covering material and the outer covering material include: Multiple insertion holes are formed, The fire-resistant coating structure described in (((2))).

[0104] (((9))) The first hole covering material is divided into multiple parts in the circumferential direction. The fire-resistant coating structure described in (((2))).

[0105] (((10))) The aforementioned fire-resistant coating material is formed in multiple layers. A fire-resistant coating structure as described in any one of items (((1))) to (((9))). [Explanation of Symbols]

[0106] 10 Steel beams 12 Web 12H through hole 14 Flange 20 hole covering material 22 First hole covering material 22H Through hole 24 Second hole covering material 24H Through Hole 30 Outer cladding 32 Covering material (outer covering material) 32H Through hole 34 Covering material (outer covering material) 34H Through hole 36 Support material 40 Box-shaped sheathing material (fireproof sheathing material) 42 Side covering material (fireproof covering material) 42H Through hole 44. Bottom lining material (refractory lining material) 46. ​​Wood-based cladding materials (fire-resistant cladding materials) 46H Through Hole 50-hole coating material 52 Third hole coating material 52H Through Hole 54. Fourth hole coating material 60. Coating material (perforated coating material, outer coating material)

Claims

1. A hole covering material that covers the hole wall of a through hole formed in the web of a steel beam and the outer circumference of the web of the through hole, An outer covering material laminated on the hole covering material on the axially outer side of the through hole, A box-shaped fire-resistant covering material is positioned surrounding the flange and web of the steel beam and in contact with the outer covering material, Equipped with, The hole covering material, the outer covering material, and the fire-resistant covering material each have through holes for inserting pipes that are in communication with each other. Fire-resistant coating structure.

2. The aforementioned hole covering material is An annular first hole covering material that covers the hole wall, A second hole covering material is positioned on the axial outer side of the through hole, in contact with the first hole covering material, and covers the web surface. It is equipped with The fire-resistant coating structure according to claim 1.

3. The aforementioned hole covering material is A third hole covering material covers the hole wall and protrudes from both sides of the web, A fourth hole covering material is laminated on the third hole covering material on the radially outer side of the through hole to cover the web surface, It is equipped with The fire-resistant coating structure according to claim 1.

4. At least one of the hole covering material and the outer covering material is The through hole is positioned in a compressed state along its axial direction. A fire-resistant coating structure according to any one of claims 1 to 3.

5. The outer covering material and the fire-resistant covering material are fixed to each other with fasteners. The fire-resistant coating structure according to claim 1.

6. The end faces of the upper and lower flanges of the steel beam and the fire-resistant covering material are separated. The fire-resistant coating structure according to claim 1.

7. A support member is positioned between the outer covering material and the lower flange of the steel beam. Or, The outer covering material is placed on the lower flange of the steel beam. The fire-resistant coating structure according to claim 1.

8. Multiple through holes are formed in the web. The first hole covering material is provided for each of the through holes. The second hole covering material and the outer covering material include: Multiple insertion holes are formed, The fire-resistant coating structure according to claim 2.

9. The first hole covering material is divided into multiple parts in the circumferential direction. The fire-resistant coating structure according to claim 2.

10. The aforementioned fire-resistant coating material is formed in multiple layers. The fire-resistant coating structure according to claim 1.

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