Fire-resistant coating structure for steel frame members

Abstract

To restrain decrease of fire resistance efficiency of a steel frame member.SOLUTION: A fire resistive covering structure of a steel frame member comprises a steel pipe 12, a plurality of ligneous fire resistive covering materials 30 placed around the steel pipe 12 and fireproof covering the steel pipe 12, a plurality of corner substrate materials 40 having a pair of flange parts 40A bending along corner parts 30C where end parts of adjacent ligneous fire resistive covering materials 30 are butted and with each end part attached, and erected around the steel pipe 12 to support adjacent ligneous fire resistive covering materials 30, and a pair of intermediate substrate materials 70 each formed in a C-shaped cross section, erected between adjacent corner substrate materials 40 in a back to back state, and supporting the ligneous fire resistive covering material 30. A joint of adjacent ligneous fire resistive covering materials 30 is placed on the pair of intermediate substrate materials 70, end parts of the ligneous fire resistive covering materials 30 are attached by machine screws respectively.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a fire-resistant coating structure for steel frame members. [Background technology]

[0002] A plurality of wooden members surrounding a steel frame member is known (see, for example, Patent Documents 1 to 3).

[0003] In Patent Document 1, wood material is laminated on the surface of a fire-resistant covering material that covers a steel frame member. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2017-008640 [Patent Document 2] Japanese Patent Application Publication No. 2019-056202 [Patent Document 3] Japanese Patent Application Publication No. 2019-206854 Summary of the Invention [Problem to be solved by the invention]

[0005] However, corners where the ends of adjacent wooden pieces butt together are heated from two directions during a fire, so they are more likely to heat up and open up than other parts, which can reduce the fire resistance of steel frame members.

[0006] In consideration of the above, the present invention aims to suppress the deterioration of the fire resistance of steel frame members. [Means for solving the problem]

[0007] The fire-resistant coating structure for steel frame members according to the first embodiment comprises a steel frame member, a plurality of wood fire-resistant coating materials arranged around the steel frame member to provide fire-resistant coating for the steel frame member, and a corner base material that is bent along the corner where the ends of adjacent wood fire-resistant coating materials abut and has a pair of flange portions to which the ends are respectively attached, and that supports the adjacent wood fire-resistant coating materials.

[0008] According to the fire-resistant covering structure for steel frame members of the first aspect, a plurality of wood fire-resistant covering materials are arranged around the steel frame members. These wood fire-resistant covering materials provide fire-resistant covering for the steel frame members. As a result, the present invention increases the amount of carbon stored compared to when the steel frame members are covered with fire-resistant covering materials such as gypsum boards or calcium silicate boards. This contributes to decarbonization.

[0009] Adjacent wood fire-resistant covering materials are supported by corner underlayments. The corner underlayments have a pair of flanges that are bent along the corners where the ends of adjacent wood fire-resistant covering materials abut, and the ends of adjacent wood fire-resistant covering materials are attached to the pair of flanges.

[0010] This prevents the joints between the ends of adjacent wood fire-resistant covering materials from opening during a fire. Even if the joints between the ends of adjacent wood fire-resistant covering materials do open during a fire, the pair of flanges bent along the corners will block heat from penetrating through the joints into the steel frame members, thereby improving the fire resistance of the steel frame members.

[0011] In this way, the present invention can improve the fire resistance of steel frame members while contributing to decarbonization.

[0012] The fire-resistant coating structure for steel frame members of the second embodiment is the fire-resistant coating structure for steel frame members of the first embodiment, which includes a first bracket protruding outward from the steel frame member, and the corner base material has a second bracket that is bolted to the first bracket while being stacked in the material axis direction of the steel frame member, and one of the bolt holes in the first bracket and the second bracket is an elongated hole extending in the width direction of the wood fire-resistant coating material, and the other bolt hole in the first bracket and the second bracket is an elongated hole extending in the thickness direction of the wood fire-resistant coating material.

[0013] According to the second aspect of the fire-resistant coating structure for steel frame members, the first bracket protrudes outward from the steel frame member. The corner base member also has a second bracket. The second bracket is bolted to the first bracket in a state where it is overlapped with the first bracket in the material axis direction of the steel frame member.

[0014] By attaching the corner base material to the steel frame member via the first bracket and the second bracket in this manner, the workability of the corner base material is improved.

[0015] In addition, one of the bolt holes in the first bracket and the second bracket is an elongated hole extending in the width direction of the wood fire-resistant covering material, and the other of the bolt holes in the first bracket and the second bracket is an elongated hole extending in the thickness direction of the wood fire-resistant covering material.

[0016] This allows the corner base material to be attached to the steel frame in two directions, absorbing processing and installation errors in the wood fire-resistant covering material.

[0017] The fire-resistant coating structure for steel frame members of the third aspect is the fire-resistant coating structure for steel frame members of the first aspect, in which the corner base material is positioned at a distance from the steel frame members and is supported by the main body surrounding the steel frame members.

[0018] According to the third aspect of the fire-resistant covering structure for steel frame members, the corner furring members are placed at a distance from the steel frame members and are supported by the surrounding framework of the steel frame members. This allows the corner furring members and wood fire-resistant covering materials to be installed without being affected by the installation accuracy of the steel frame members. [Effects of the Invention]

[0019] As described above, according to the present invention, it is possible to suppress a decrease in the fire resistance of steel frame members. [Brief explanation of the drawings]

[0020] [Figure 1] FIG. 1 is a plan cross-sectional view showing a concrete-filled steel pipe column to which a fire-resistant coating structure for a steel frame member according to the first embodiment is applied. [Figure 2] 2 is an exploded cross-sectional plan view of the corner base material, metal plate, wood fire-resistant covering material, and decorative material shown in FIG. 1. FIG. [Figure 3] FIG. 10 is a cross-sectional plan view showing a concrete-filled steel pipe column to which a fire-resistant coating structure for a steel frame member according to a second embodiment is applied. [Figure 4] A cross-sectional plan view showing a steel column to which a modified example of the fire-resistant coating structure for steel members according to the second embodiment is applied. [Figure 5] FIG. 5 is a cross-sectional plan view showing the column base of the steel column shown in FIG. [Figure 6] FIG. 6 is a cross-sectional view taken along line 6-6 in FIG. 5. [Figure 7] FIG. 5 is an elevation (side view) showing the column capital of the steel column shown in FIG. 4. [Figure 8] FIG. 8 is a cross-sectional view taken along line 8-8 in FIG. 7. [Figure 9] FIG. 2 is a cross-sectional plan view corresponding to FIG. 1, showing a concrete-filled steel pipe column to which a modified example of the fire-resistant coating structure for steel frame members according to the first embodiment is applied. [Figure 10] 10 is an exploded cross-sectional plan view of the corner base material, metal plate, wood fire-resistant covering material, and decorative material shown in FIG. 9. FIG. [Figure 11] FIG. 2 is a cross-sectional view showing a steel beam to which a modified example of the fire-resistant coating structure for steel members according to the first embodiment is applied. DETAILED DESCRIPTION OF THE INVENTION

[0021] (First embodiment) First, a first embodiment will be described. Note that the arrow X direction and the arrow Y direction shown appropriately in each drawing indicate two horizontal directions that are perpendicular to each other.

[0022] Fig. 1 shows a concrete-filled steel pipe column (hereinafter referred to as "CFT column") 10 to which the fire-resistant structure of steel frame members according to this embodiment is applied. The CFT column 10 includes a steel pipe 12 and concrete 14 filled inside the steel pipe 12.

[0023] As an example, the steel pipe 12 is a square steel pipe. This steel pipe 12 is fire-resistant coated with a plurality of wood fire-resistant coating materials 30. Note that the steel pipe 12 is not limited to a square steel pipe, but may also be a round steel pipe. Furthermore, the steel pipe 12 is an example of a steel frame member.

[0024] (First bracket) As shown in Fig. 2, a pair of first brackets 20 for attaching corner base members 40 (described later) are attached to each corner of the steel pipe 12. The pair of first brackets 20 are formed from metal plates such as steel plates, and are arranged with their thickness direction aligned with the material axis of the steel pipe 12. Furthermore, the pair of first brackets 20 are formed in a rectangular shape when viewed from the material axis direction of the steel pipe 12.

[0025] The pair of first brackets 20 are respectively arranged along the outer surfaces (side surfaces) of the corners of the steel pipe 12. In other words, the pair of first brackets 20 are arranged along directions that intersect with each other (substantially perpendicular in this embodiment) when viewed from the material axis direction of the steel pipe 12. One end of each first bracket 20 is joined by welding or the like while abutting against the outer surface of the steel pipe 12.

[0026] Each first bracket 20 is formed with a plurality of first bolt holes 22. The plurality of first bolt holes 22 are through holes that penetrate the first bracket 20 in the thickness direction. The plurality of first bolt holes 22 are also elongated holes that extend in the thickness direction (direction of arrow X) of one of the wood fire-resistant coating materials 30A, which will be described later. A corner base material 40, which will be described later, is attached to this first bracket 20.

[0027] (Wood fireproof covering material) 1, multiple (four in this embodiment) wood fire-resistant covering materials 30 are arranged to surround the steel pipe 12. More specifically, the multiple wood fire-resistant covering materials 30 are arranged in the shape of a rectangular frame surrounding the steel pipe 12 when viewed from the material axis direction of the steel pipe 12, and provide fire-resistant covering for the steel pipe 12.

[0028] Each wood fire-resistant coating material 30 is arranged with a gap G between it and the outer surface of the steel pipe 12. The gap G functions as an insulating layer (insulating space). Furthermore, by leaving a gap G between the outer surface of the steel pipe 12 and the wood fire-resistant coating material 30, interference between the wood fire-resistant coating material 30 and irregularities such as weld beads formed on the outer surface of the steel pipe 12 is suppressed, and the gap G also makes it possible to absorb construction errors of the wood fire-resistant coating material 30.

[0029] Each wood fire-resistant covering material 30 is formed from a wood board such as CLT (Cross Laminated Timber), LVL (Laminated Veneer Lumber), laminated timber, or plywood. Note that, from the viewpoint of fire resistance, adhesives used for laminated timber and the like are preferably thermosetting resin adhesives.

[0030] The wood fire-resistant coating material 30 functions as a fire-resistant coating material. Specifically, the wood fire-resistant coating material 30 functions as a sub-combustible layer that provides fire-resistant coating for the steel pipe 12. The sub-combustible layer burns during a fire to form a carbonized layer (thermal insulating layer), thereby preventing the heat of the fire from penetrating into the steel pipe 12 side.

[0031] The thickness (thickness) t of the wood fire-resistant covering material 30 is set appropriately depending on the required fire resistance performance. More specifically, when wood (woody material) is heated on one side, it carbonizes to 40 mm to 60 mm after one hour of heating, 70 mm to 90 mm after two hours of heating, and 100 mm to 120 mm after three hours of heating. When wood (woody material) is heated on two sides, a 10% to 20% margin in thickness is required, and the wood thickness (thickness t of the wood fire-resistant covering material 30) for columns, beams, etc. is set to 44 mm to 72 mm after one hour of heating, 77 mm to 108 mm after two hours of heating, and 110 mm to 144 mm after three hours of heating.

[0032] Examples of tree species (wood) used for the wood fire-resistant covering material 30 include larch, Douglas fir, and cedar. Depending on the tree species, the burning state of the outer surface (front surface) of the wood fire-resistant covering material 30 after heating may vary. For example, in the case of cedar, burning tends to continue over the entire outer surface of the wood fire-resistant covering material 30.

[0033] On the other hand, in the case of larch and Douglas fir, burning continues partially on the outer surface of the wood fire-resistant covering material 30, but the burning is likely to stop overall. Therefore, larch and Douglas fir are preferred tree species (wood) to be used for the wood fire-resistant covering material 30.

[0034] In addition, the steel pipe 12 has high thermal conductivity. Therefore, even if combustion continues partially on the outer surface of the wood fire-resistant covering material 30 during a fire, the heat of the fire is diffused throughout the steel pipe 12, suppressing local temperature increases in the steel pipe 12. Furthermore, the concrete 14 inside the steel pipe 12 has a large heat capacity, further suppressing temperature increases in the steel pipe 12.

[0035] Therefore, if larch or Douglas fir is used for the wood fire-resistant covering material 30, even if partial combustion continues on the outer surface of the wood fire-resistant covering material 30 during a fire, the fire resistance performance of the CFT column 10 is ensured.

[0036] When viewed from the axial direction of the steel pipe 12, adjacent wood fire-resistant coating materials 30 are arranged in directions that are approximately perpendicular to each other (the directions of arrows X and Y). Adjacent wood fire-resistant coating materials 30 are arranged with their ends butting against each other, and a joint 32 is formed between the ends. These wood fire-resistant coating materials 30 are attached to corner base materials 40 via metal plates 34, which will be described later.

[0037] The outer surface of the wood fire-resistant covering material 30 is covered with a decorative material 38. The decorative material 38 is made of, for example, wood or a waterproof material such as resin, and is attached to the outer surface of the wood fire-resistant covering material 30 with screws (not shown). This decorative material 38 enhances the design of the CFT column 10.

[0038] Furthermore, for example, when the CFT column 10 is installed outdoors, the decorative material 38 as a weather-resistant layer suppresses corrosion of the wood fire-resistant covering material 30 due to rain, etc., thereby improving the durability of the wood fire-resistant covering material 30. The decorative material 38 can be omitted.

[0039] (Corner underlayment) The corner base members 40 are arranged around the steel pipes 12 along the material axis direction of the steel pipes 12 and are attached to each corner of the steel pipes 12. The corner base members 40 are formed from lightweight steel frames or the like with an L-shaped cross section and are arranged on the outside of each corner of the steel pipes 12. The corner base members 40 are arranged with the material axis direction of the steel pipes 12 as their longitudinal direction, and extend from the base to the capital of the steel pipes 12.

[0040] The corner base material 40 has a pair of flange portions 40A. When viewed from the material axis direction of the steel pipe 12, the pair of flange portions 40A are bent along the corner portions 30C of adjacent wood fire-resistant covering materials 30. The ends of adjacent metal plates 34 and the ends of adjacent wood fire-resistant covering materials 30 are attached to the pair of flange portions 40A, respectively.

[0041] (metal plate) The metal plate 34 serving as a heat insulating layer is made of a steel plate, iron plate, or the like having high thermal conductivity, and is disposed opposite the outer surface (side surface) of the steel pipe 12. A wood fire-resistant covering material 30 is overlaid on the outer surface of this metal plate 34.

[0042] The metal plate 34 and the wood fire-resistant covering material 30 are arranged across the outer surfaces of the flange portions 40A of adjacent corner underlayment materials 40, and both ends are attached (fastened together) to the flange portions 40A with multiple screws 36. The multiple screws 36 are arranged at intervals in the longitudinal direction of the flange portions 40A.

[0043] Counterbore holes 31 for screws 36 are formed on the outer surface of the wood fire-resistant covering material 30. The wood fire-resistant covering material 30 and the metal plate 34 may also be pre-integrated into a unit. In this case, the metal plate 34 is, for example, superimposed on the inner surface of the wood fire-resistant covering material 30 and bonded with an adhesive.

[0044] (Second bracket) As shown in Fig. 2, a pair of second brackets 50 are provided on the corner base material 40. The pair of second brackets 50 are formed from metal plates such as steel plates, and are arranged with their thickness direction aligned with the material axis of the steel pipe 12. Furthermore, the pair of second brackets 50 are formed in a rectangular shape when viewed from the thickness direction of the steel pipe 12.

[0045] The pair of second brackets 50 are respectively arranged along the inner surfaces of the pair of flange portions 40A. That is, the pair of second brackets 50 are arranged along directions (arrow X direction and arrow Y direction) that are substantially perpendicular to each other when viewed from the material axis direction of the steel pipe 12. One end of each second bracket 50 is joined by welding or the like while abutting against the inner surfaces of the pair of flange portions 40A.

[0046] A plurality of second bolt holes 52 are formed in each second bracket 50. The plurality of second bolt holes 52 are through holes that penetrate the second bracket 50 in the thickness direction. The plurality of second bolt holes 52 are elongated holes that extend in the width direction (arrow Y direction) of one of the adjacent wood fire-resistant coating materials 30A, 30B. In other words, the first bolt holes 22 and the second bolt holes 52 are elongated holes that extend in directions (arrow X direction, arrow Y direction) that are approximately perpendicular to each other.

[0047] The first bolt hole 22 may be an elongated hole extending in the width direction of one of the adjacent wooden fire-resistant coating materials 30A, and the second bolt hole 52 may be an elongated hole extending in the thickness direction of one of the adjacent wooden fire-resistant coating materials 30A. Furthermore, the first bolt hole 22 and the second bolt hole 52 are not limited to elongated holes, and at least one of the first bolt hole 22 and the second bolt hole 52 may be a circular hole. Furthermore, the first bolt hole 22 and the second bolt hole 52 are an example of a bolt hole.

[0048] The pair of second brackets 50 are bolted to the pair of first brackets 20 provided on the steel pipe 12 in a state where they are stacked in the material axis direction of the steel pipe 12. Specifically, the first bracket 20 and the second bracket 50 are joined by bolts 54 and nuts (not shown) that pass through the first bolt holes 22 and the second bolt holes 52. In this way, corner base members 40 are attached to each corner of the steel pipe 12.

[0049] (action) Next, the operation of the first embodiment will be described.

[0050] As shown in Fig. 1, according to this embodiment, a plurality of wood fire-resistant covering materials 30 are arranged around the steel pipes 12 of the CFT column 10. The steel pipes 12 are fire-resistant covered by these wood fire-resistant covering materials 30. As a result, in this embodiment, the amount of carbon stored is increased compared to when the steel pipes 12 are fire-resistant covered by gypsum boards, calcium silicate boards, or the like. This can therefore contribute to decarbonization.

[0051] Adjacent wood fire-resistant covering materials 30 are supported by corner base materials 40. The corner base materials 40 have a pair of flange portions 40A that are arranged along corner portions 30C where the ends of adjacent wood fire-resistant covering materials 30 abut. The ends of adjacent wood fire-resistant covering materials 30 are attached to the pair of flange portions 40A, respectively.

[0052] This prevents the joints 32 between the ends of adjacent wood fire-resistant covering materials 30 from opening during a fire. Even if the joints 32 between the ends of adjacent wood fire-resistant covering materials 30 open during a fire, the pair of flanges 40A bent along the corners 30C will block heat from penetrating through the joints 32 to the steel pipe 12. This improves the fire resistance of the steel pipe 12.

[0053] In this way, in this embodiment, the fire resistance of the steel pipe 12 of the CFT column 10 can be improved while contributing to decarbonization.

[0054] 2, a pair of first brackets 20 are provided at each corner of the steel pipe 12. The pair of first brackets 20 each protrude outward from the outer surface of the corner of the steel pipe 12. The corner base material 40 also has a pair of second brackets 50. The pair of second brackets 50 are bolted to the pair of first brackets 20 in a state where they are overlapped in the material axial direction of the steel pipe 12.

[0055] By attaching the corner base material 40 to the steel pipe 12 via a pair of first brackets 20 and a pair of second brackets 50 in this manner, the workability of the corner base material 40 is improved.

[0056] Furthermore, the first bolt holes 22 of the pair of first brackets 20 are elongated holes extending in the width direction (arrow X direction) of one of the adjacent wooden fire-resistant coating materials 30A. Furthermore, the second bolt holes 52 of the pair of second brackets 50 are elongated holes extending in the thickness direction (arrow Y direction) of one of the adjacent wooden fire-resistant coating materials 30A. In other words, the first bolt holes 22 and the second bolt holes 52 are elongated holes extending in directions (arrow X direction and arrow Y direction) that are approximately perpendicular to each other.

[0057] This allows the attachment position of the corner base material 40 to be adjusted in two directions (arrow X direction and arrow Y direction) relative to the steel pipe 12. Therefore, processing errors and construction errors of the wood fire-resistant covering material 30 can be absorbed.

[0058] Furthermore, the wood fire-resistant covering material 30 is supported by the corner base material 40 with a gap G between it and the outer surface of the steel pipe 12. This creates an insulating layer (air layer) between the outer surface of the steel pipe 12 and the inner surface of the wood fire-resistant covering material 30, further improving the fire resistance of the steel pipe 12.

[0059] Furthermore, by leaving a gap G between the outer surface of the steel pipe 12 and the wood fire-resistant coating material 30, interference between the unevenness of the weld beads and the like formed on the outer surface of the steel pipe 12 and the wood fire-resistant coating material 30 is suppressed, and construction errors of the wood fire-resistant coating material 30 are absorbed.

[0060] Furthermore, the wood fire-resistant covering material 30 provides fire-resistant covering to the outer surface of the steel pipe 12 via a metal plate 34 as a heat insulating layer. As a result, for example, in the event of a fire, if combustion continues partially on the outer surface of the wood fire-resistant covering material 30, the metal plate 34 diffuses the heat of the fire, dispersing it throughout the steel pipe 12. As a result, local temperature increases in the steel pipe 12 are suppressed. This improves the fire resistance of the CFT column 10.

[0061] Second Embodiment Next, a second embodiment will be described. In the second embodiment, the same components as those in the first embodiment will be denoted by the same reference numerals, and the description thereof will be omitted as appropriate.

[0062] Figure 3 shows a CFT column 10 to which the fire-resistant coating structure for steel members according to this embodiment is applied. A number of corner furring members 60, reinforcing furring members 62, and intermediate furring members 70 are arranged around the CFT column 10.

[0063] (Corner underlayment) The corner base members 60 are formed from studs (lightweight steel frames) with a C-shaped cross section, and are respectively arranged on the outside of each corner of the steel pipes 12. The corner base members 60 are arranged with their longitudinal direction aligned with the material axis of the steel pipes 12, and extend from the base to the capital of the column of the steel pipes 12. The cross section of the corner base member 60 is rectangular, extending in the width direction of one of the adjacent wood fire-resistant covering materials 30.

[0064] The corner base material 60 is arranged along the corners 30C of adjacent wood fire-resistant covering materials 30. This corner base material 60 has a pair of flange portions 60A. When viewed from the material axis direction of the steel pipe 12, the pair of flange portions 60A are bent along the corners 30C of adjacent wood fire-resistant covering materials 30. The ends of adjacent metal plates 34 and the ends of adjacent wood fire-resistant covering materials 30 are attached to the pair of flange portions 60A with multiple screws 36, respectively. In addition, the corner base material 60 is reinforced by a reinforcing base material 62.

[0065] (reinforcing base material) Similar to the corner base material 60, the reinforcing base material 62 is formed from a stud (lightweight steel frame) with a C-shaped cross section, and is arranged adjacent to the corner base material 60. Furthermore, the reinforcing base material 62 is arranged in a different orientation (rotated by 90°) from the corner base material 60 when viewed from the material axis direction of the steel pipe 12. This reinforcing base material 62 prevents the corner base material 60 from collapsing, etc. Note that the reinforcing base material 62 can be omitted as appropriate.

[0066] (Intermediate base material) A pair of intermediate base members 70 are arranged between adjacent corner base members 60. The pair of intermediate base members 70 are formed from studs (lightweight steel frames) with a C-shaped cross section, and are arranged back-to-back. The pair of intermediate base members 70 are arranged with the material axis direction of the steel pipes 12 as their longitudinal direction, and extend from the base to the capital of the steel pipes 12. The cross-sectional shape of the intermediate base member 70 is rectangular, extending in the thickness direction of the wood fire-resistant coating material 30 that it supports.

[0067] (lower runner, upper runner) The lower ends of the corner base members 60, the reinforcing base members 62, and the intermediate base members 70 are supported by lower runners 80. The lower runners 80 are formed from lightweight steel frames or the like with a C-shaped cross section that is open at the top, and multiple lower runners 80 are arranged in a rectangular frame shape so as to surround the column bases of the steel pipes 12.

[0068] Each lower runner 80 is fixed to a frame such as a slab with screws, etc. The lower ends of the corner base materials 60, reinforcing base materials 62, and intermediate base materials 70 are fitted inside these lower runners 80 and fixed with screws, etc. (not shown).

[0069] Similarly, the upper ends of the corner base members 60, the reinforcing base members 62, and the intermediate base members 70 are supported by upper runners (not shown). The upper runners are formed of lightweight steel frames or the like with a C-shaped cross section that is open at the bottom, and multiple upper runners are arranged in a rectangular frame shape to surround the column capitals of the steel pipes 12.

[0070] Each upper runner is fixed to the frame of the upper floor, such as a slab or beam, with screws, etc. The lower ends of the corner base material 60, reinforcing base material 62, and intermediate base material 70 are fitted inside these upper runners and fixed with screws, etc. The lower runner 80 and upper runner are examples of runners.

[0071] (Wood fireproof covering material) The multiple wood fire-resistant covering materials 30 are arranged to surround the steel pipes 12 of the CFT columns 10, and are arranged at a distance G from the outer surfaces of the steel pipes 12. Each wood fire-resistant covering material 30 is arranged across the corner base material 60 and the intermediate base material 70, and both ends of each material are attached to the corner base material 60 and the intermediate base material 70, respectively, with multiple screws 36.

[0072] Adjacent wood fire-resistant covering materials 30 are joined by half joints on a pair of intermediate base materials 70. These wood fire-resistant covering materials 30 provide fire-resistant covering for the steel pipes 12 of the CFT column 10.

[0073] (action) Next, the operation of the second embodiment will be described. Note that the explanation of the same operations and effects as those of the first embodiment will be omitted as appropriate.

[0074] As shown in Figure 3, adjacent wood fire-resistant covering materials 30 are supported by a corner base material 60. The corner base material 60 has a pair of flange portions 60A. The pair of flange portions 60A are bent along corner portions 30C where the ends of adjacent wood fire-resistant covering materials 30 abut. The ends of adjacent wood fire-resistant covering materials 30 are attached to the pair of flange portions 60A, respectively.

[0075] This prevents the joints 32 between the ends of adjacent wood fire-resistant covering materials 30 from opening during a fire. Even if the joints 32 between the ends of adjacent wood fire-resistant covering materials 30 open during a fire, the pair of flanges 60A bent along the corners 30C will block heat from penetrating through the joints 32 to the steel pipe 12. This improves the fire resistance of the steel pipe 12.

[0076] In this way, in this embodiment, similar to the first embodiment described above, it is possible to improve the fire resistance of the steel pipe 12 of the CFT column 10 while contributing to decarbonization.

[0077] The corner base material 60 is placed at a distance G from the steel pipe 12 and is supported by the surrounding structure of the steel pipe 12 via a lower runner 80 and an upper runner (not shown). This allows the corner base material 60 and the wood fire-resistant covering material 30 to be installed without being affected by the installation accuracy of the steel pipe 12.

[0078] (Modification of the second embodiment) In the second embodiment, the corner base material 60 is formed by a stud. However, the corner base material 60 is not limited to a stud. For example, in the modified example shown in Figures 4 and 5, the corner base material 90 is formed by a lightweight steel frame or the like having an L-shaped cross section.

[0079] The corner base members 90 are respectively arranged on the outside of each corner of the steel pipe 12. The corner base members 90 are arranged with the material axis direction of the steel pipe 12 as the longitudinal direction, and extend from the base portion of the steel pipe 12 to the capital portion of the column.

[0080] The corner underlayment material 90 has a pair of flange portions 90A. The pair of flange portions 90A are bent along the corner portions 30C of adjacent wood fire-resistant covering materials 30. The ends of adjacent metal plates 34 and the ends of adjacent wood fire-resistant covering materials 30 are attached to the pair of flange portions 90A, respectively.

[0081] 5 and 6, the lower end of the corner base material 90 is supported by a lower runner 92. As shown in Fig. 6, the lower runners 92 are formed of lightweight steel frames or the like with an L-shaped cross section, and a plurality of lower runners 92 are arranged in a rectangular frame shape so as to surround the column bases of the steel pipes 12. Each lower runner 92 is fixed to a frame 94 such as a slab with screws or the like. The lower end of the corner base material 90 is fixed to these lower runners 92 with screws or the like.

[0082] 7 and 8, the upper end of the corner furring member 90 is supported by an upper runner 96. The upper runner 96 is formed from a lightweight steel frame or the like with an L-shaped cross section, and is attached to the lower flange portion 100A of a steel beam 100. The upper end of the corner furring member 90 is fixed to this upper runner 96 with screws or the like.

[0083] 7, adjacent corner base materials 90 may be connected via a connecting material 98. The upper runner 96 and the lower runner 92 are an example of a runner.

[0084] In this way, the shape and support structure of the corner base material 90 can be changed as appropriate.

[0085] (Modifications of the first to third embodiments) Next, modified examples of the first to third embodiments will be described. Note that, although various modified examples will be described below using the first embodiment as an example, these modified examples can also be applied to the second and third embodiments as appropriate.

[0086] In the first embodiment, the steel frame members are the steel pipes 12 of the CFT column 10. However, the steel frame members are not limited to the steel pipes 12, and may be shaped steel.

[0087] 9 and 10, for example, a steel column 110 serving as a steel frame member is formed of an H-shaped steel. The steel column 110 has a pair of flange portions 110A, 110B facing each other in the horizontal direction, and a web portion 110C connecting the pair of flange portions 110A, 110B to each other.

[0088] A pair of first brackets 20 are attached to both end portions of the pair of flange portions 110A by welding or the like. A corner base material 40 is attached to the pair of first brackets 20 via a pair of second brackets 50.

[0089] In the first embodiment, the steel frame members are columns (CFT columns 10). However, the steel frame members are not limited to columns, and may be steel beams. For example, in the modified example shown in FIG. 11, the steel frame members are steel beams 120.

[0090] The steel beam 120 is formed of an H-shaped steel. The steel beam 120 has an upper flange portion 120A and a lower flange portion 120B that face each other in the vertical direction, and a web portion 120C that connects the upper flange portion 120A and the lower flange portion 120B.

[0091] A pair of first brackets 20 are attached to both end portions of the lower flange portion 120B by welding or the like. A pair of second brackets 50 are interposed between the pair of first brackets 20 and the corner base material 40.

[0092] A slab 130 is provided on top of the upper flange portion 120A. A first bracket 20 is attached to each end of both sides of this upper flange portion 120A by welding or the like. A base material 140 is attached to this first bracket 20 via a second bracket 50. The base material 140 is formed of a flat bar or the like. The ends of the wood fire-resistant covering material 30 are attached to this base material 140 by a plurality of screws or the like.

[0093] In this way, the steel frame members are not limited to CFT columns or steel frame columns, but may also be steel frame beams.

[0094] Although one embodiment of the present invention has been described above, the present invention is not limited to such an embodiment, and one embodiment and various modified examples may be used in appropriate combination, and it goes without saying that the present invention can be implemented in various forms as long as it does not deviate from the gist of the present invention. [Explanation of symbols]

[0095] 12 Steel pipes (steel frame components) 20 First Bracket 22 First bolt hole (bolt hole) 30 Wooden fireproof cladding 30C Corner 40 Corner underlayment 40A flange 50 Second bracket 52 Second bolt hole (bolt hole) 60 Corner Underlayment 60A flange 90 Corner base material 90A flange 110 Steel columns (steel members) 120 Steel beams (steel members) G interval

Claims

1. Steel frame members, A plurality of wood fire-resistant covering materials are arranged around the steel frame members and provide fire-resistant covering for the steel frame members; a plurality of corner underlayments that are bent along the corners where the ends of adjacent wood fire-resistant covering materials butt against each other and have a pair of plate-shaped portions to which the ends are respectively attached, and that are erected around the steel frame members and support the adjacent wood fire-resistant covering materials; a pair of intermediate base materials each having a C-shaped cross section, standing back-to-back between the adjacent corner base materials, and supporting the wood fire-resistant covering material; Equipped with The joints of the adjacent wood fire-resistant covering materials are located on the pair of intermediate base materials, and the ends of the wood fire-resistant covering materials are attached with screws. Fire-resistant coated structure for steel frame members.

2. The ends of adjacent wood fire-resistant coating materials are joined by a half notch on a pair of intermediate base materials. The fire-resistant coating structure for steel frame members according to claim 1.

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