Fire-resistant structure of a wood-steel hybrid member

Abstract

To provide a fire-resistant structure for wood-steel hybrid members that can ensure the fire-resistance performance of joints.SOLUTION: A fire-resistant structure 100 comprising a second wood covering material 26 for covering a joint part 16 where wood-steel hybrid members consisting of a steel frame member 12 and a first wood covering material 14 for covering a surface of the steel frame member 12 are butted against each other in an axial direction of the wood-steel hybrid members and joined by bolts, has: a first inorganic fire-resistant material 28 provided between an edge face 14A of the first wood covering material 14 and an edge face 26A of the second wood covering material 26; and a second inorganic fire-resistant material 30 provided on a face facing the bolted part on a surface of the second wood covering material 26.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a fire-resistant structure of a wood-steel hybrid member composed of wood and steel.

Background Art

[0002] Conventionally, the applicant of this patent has developed a wood-steel hybrid beam, which is a structural member having a fire resistance performance of 1 hour and in which a steel beam is fire-resistant coated with wood (hereinafter referred to as a wood coating material) (see, for example, Patent Document 1). This wood coating material burns at a rate of 0.7 to 1.0 mm / min during a fire, but stops burning after the fire, thereby suppressing the temperature rise of the steel beam supporting the load and playing a role in preventing collapse.

[0003] When actually constructing a wood-steel hybrid beam, a member in which a wood coating material is attached to a steel beam in advance at a factory is transported to the site. However, for the joint part of the steel beam, since it is constructed on site, the wood coating material cannot be attached in advance at the factory. Therefore, the wood coating material for the joint part needs to be attached on site.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, since the work of attaching the wooden covering material of the joint part is carried out after the construction by the construction party is completed, it becomes work at a high place, and it is difficult to achieve the same construction accuracy as that in the factory. In addition, the wooden covering material attached to the joint part may have dimensional errors due to dry shrinkage, errors during processing, etc. Due to these factors, there is a possibility that a gap may occur between the wooden covering material constructed in the factory and the wooden covering material constructed on site. If such a gap occurs, this gap will become a weak point during a fire, and there is a risk that the predetermined fire resistance performance cannot be ensured.

[0006] Also, as shown in FIG. 6 of the conventional example, it is conceivable to join the beams 1 to each other with a plate and bolts 2 at the joint part. However, since the bolt heads and screw parts protrude from the flange surface 3 and the web surface 4, the covering thickness of the wooden covering material 5 must be reduced by the amount of the protruding bolt heads and screw parts. When the covering thickness of the wooden covering material 5 becomes small, this wooden covering material 5 burns out early during a fire, and the combustion progresses from the joint part, and there is a risk that the predetermined fire resistance performance cannot be ensured.

[0007] The present invention has been made in view of the above, and an object thereof is to provide a fire-resistant structure of a wood-steel hybrid member capable of ensuring the fire resistance performance of a joint part.

Means for Solving the Problems

[0008] In order to solve the above problems, the fire-resistant structure of a wood-steel hybrid member according to the present invention is a fire-resistant structure including a second wooden covering material that covers a joint part where wood-steel hybrid members each composed of a steel frame member and a first wooden covering material that covers the surface of the steel frame member are butted against each other in the member axis direction and bolted together. The fire-resistant structure has a first inorganic fire-resistant material provided between the end face of the first wooden covering material and the end face of the second wooden covering material, and a second inorganic fire-resistant material provided on the surface of the second wooden covering material on the surface facing the bolted part.

[0009] In addition, in the fireproof structure of another wood-steel hybrid member according to the present invention, in the above-described invention, the first and second inorganic fireproof materials are dry fireproof materials that can be processed at the construction site where the wood-steel hybrid member is attached.

[0010] In addition, in the fireproof structure of another wood-steel hybrid member according to the present invention, in the above-described invention, the end faces of the first and second wood covering materials are arranged in a jagged manner.

Advantages of the Invention

[0011] According to the fireproof structure of the wood-steel hybrid member of the present invention, there is provided a fireproof structure including a second wood covering material that covers a joint portion where wood-steel hybrid members each composed of a steel frame member and a first wood covering material covering the surface of the steel frame member are butt-jointed in the member axial direction and bolted together. The fireproof structure has a first inorganic fireproof material provided between the end face of the first wood covering material and the end face of the second wood covering material, and a second inorganic fireproof material provided on the surface of the second wood covering material facing the bolted portion. Therefore, even if heat enters through the gap between the end face of the first wood covering material and the end face of the second wood covering material during a fire, the first inorganic fireproof material delays the combustion of the wood covering material and delays the rise in the temperature of the steel material. Further, even if a portion with a small covering thickness of the second wood covering material burns through, the second inorganic fireproof material prevents the steel frame member of the joint portion from directly receiving the flame and delays the rise in the temperature of the steel material. Therefore, the effect of ensuring the fireproof performance of the joint portion can be achieved.

[0012] In addition, according to the fireproof structure of another wood-steel hybrid member of the present invention, since the first and second inorganic fireproof materials are dry fireproof materials that can be processed at the construction site where the wood-steel hybrid member is attached, the effect of facilitating dimensional adjustment and construction at the construction site is achieved.

[0013] Moreover, according to the fire-resistant structure of another wooden-steel hybrid member according to the present invention, since the end faces of the first and second wooden covering materials are arranged in a staggered manner, when heat enters from the gap between the end faces during a fire, the rise in the temperature of the steel material of the steel frame member can be delayed. In addition, the second wooden covering material can be directly fastened to the first wooden covering material with screws or the like, and the effect of improving workability is achieved.

Brief Description of the Drawings

[0014]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Embodiments for Carrying Out the Invention

[0015] Hereinafter, embodiments of the fire-resistant structure of a wooden-steel hybrid member according to the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited by this embodiment.

[0016] As shown in FIGS. 1(1) to (1)(5), the steel-timber hybrid member 10 applied to the embodiment of the present invention is a steel-timber hybrid beam member including a steel column beam 12 (steel column member) made of an H-shaped steel and a wooden covering material 14 (first wooden covering material) covering the surface of the steel column beam 12. In the joint portion 16, the steel column beams 12 are butted against each other in the member axis direction (horizontal direction), and the flanges 18 and webs 20 of the steel column beam 12 are joined by a plate 22 and bolts 24. The joint portion 16 is covered with a wooden covering material 26 (second wooden covering material).

[0017] As shown in FIG. 1(2), the fire-resistant structure 100 of the present embodiment has a reinforced gypsum board 28 (first inorganic fire-resistant material) provided between the end face 14A of the wooden covering material 14 and the end face 26A of the wooden covering material 26. Further, it has a reinforced gypsum board 30 and a calcium silicate board 32 (second inorganic fire-resistant material) laminated and provided on the surface of the wooden covering material 26 facing the bolted portion.

[0018] The wooden covering material 14 is made of laminated wood provided in a manner of covering the top, bottom, left, and right of the steel column beam 12, and is formed of tree species such as Japanese cypress and larch having a fire resistance performance of, for example, one hour. The wooden covering material 14 is constructed on the steel column beam 12 at the factory.

[0019] The wooden covering material 26 is made of laminated wood (finished wood) provided in a manner of covering the top, bottom, left, and right of the joint portion 16, and is formed of tree species such as Japanese cypress and larch having a fire resistance performance of, for example, one hour. The wooden covering material 26 is constructed at the construction site on the joint portion 16. A recess 44 for accommodating the bolts 24 and the plate 22 is formed on the inner surface of the wooden covering material 26. The recess 44 has a surface facing the bolted portion.

[0020] The upper, lower, front, and rear surfaces of the wooden covering materials 14 and 26 are formed flush. Therefore, at the joint part 16, the wooden covering materials 14 and 26 have a continuous appearance. The end faces 14A and 26A of the wooden covering materials 14 and 26 are arranged in a zigzag shape. This can help delay the rise in the temperature of the steel material of the steel frame beam 12 when heat enters through the gap between the end faces 14A and 26A during a fire. Also, when fixing the wooden covering material 26 constructed on-site with screws or the like, by making it zigzag, it can be directly fastened to the side of the wooden covering material 14 constructed at the factory.

[0021] As shown in FIGS. 1(1) and (5), the wooden covering materials 14 and 26 are fixed to the web 20 of the steel frame beam 12 with fixing members 34 such as lag screws. This fixing member 34 is a metal rod-shaped body having a plate-shaped head 36 and a shaft-shaped threaded portion 38. The tip of the threaded portion 38 is pointed, and screw threads are provided on the outer peripheral surface. The fixing member 34 is screwed into the wooden covering materials 14 and 26 through through-holes 40 provided above, below, and in between the web 20 within the same cross-section. The through-holes 40 are blocked with wooden plugs 42. As shown in FIG. 1(1), a plurality of fixing members 34 are arranged at predetermined intervals in the horizontal direction in which the steel frame beam 12 extends, and are arranged such that the screwing directions are staggered in the horizontal direction.

[0022] The reinforced gypsum board 28 is a plate-shaped one attached to the end faces 14A and 26A of the wooden covering materials 14 and 26. Also, the reinforced gypsum board 30 is a plate-shaped one attached to the recess 44 of the wooden covering material 26. Even if heat enters through the gap between the end faces 14A and 26A of the wooden covering materials 14 and 26 during a fire, the combustion of the wooden covering materials 14 and 26 can be delayed by the reinforced gypsum board 28. This delays the rise in the steel material temperature. Also, by laminating and attaching the reinforced gypsum board 30 and the calcium silicate board 32 to the portion where the covering thickness becomes small due to the bolt head and the threaded portion, even if the wooden covering material 26 with a small covering thickness burns through, the reinforced gypsum board 30 and the calcium silicate board 32 prevent the steel frame beam 12 of the joint part 16 from directly receiving the flame, and delay the rise in the steel material temperature.

[0023] As shown in Fig. 2, the reinforced gypsum board 28 is composed of a reinforced gypsum board 28A arranged along the small end face 14A facing the substantially horizontal direction, and a reinforced gypsum board 28B extending from the outer edge of the reinforced gypsum board 28A in a direction perpendicular to the small end face 14A and fitted into the interior of the wood covering material 14. The reinforced gypsum board 28B is provided to delay the combustion of the wood covering material 14 by this reinforced gypsum board 28B when heat penetrates through the gap.

[0024] The thicker the reinforced gypsum boards 28 and 30 are, the better the heat insulation effect towards the wood covering materials 14 and 26 and the heat absorption effect of the reinforced gypsum boards are, and the better the fire resistance performance is. The thickness of the reinforced gypsum boards 28 and 30 may be set to about 15 mm, for example. Also, the calcium silicate board 32 may be set to about 6 mm, for example. Note that a fire-resistant material such as a reinforced gypsum board may be used instead of the calcium silicate board. By increasing the thickness and the number of laminated sheets of the reinforced gypsum boards 28 and 30 and the calcium silicate board 32, it is possible to further improve the fire resistance performance.

[0025] When adding a reinforced gypsum board 28 to the small end face 14A of the wood covering material 14, as shown in Fig. 3, a wood base 48 for fixing the wood covering material 26 to be constructed on-site is required. In the example of the figure, the case where seven reinforced gypsum boards 28 are pasted on the small end face 14A on the wood covering material 14 side and one reinforced gypsum board 28 is pasted on the small end face 26A on the wood covering material 26 side is shown, but the number of sheets is not limited to the example of Fig. 3.

[0026] It is desirable to fill the gap between the reinforced gypsum boards 28 with a gap filler. As the gap filler, an inorganic gap filler (for example, a calcium carbonate-based filler) or a sealant for fire joints may be used. Further, in order to foam by heating and fill the gap when heat enters during a fire, a foaming fire-resistant coating material (for example, a Tyka sheet) may be provided. In this case, for example, as shown in FIG. 4, before attaching the on-site construction side wood covering material 26, a gap filler 50 and a foaming fire-resistant coating material are attached to the end face 14A of the wood covering material 14 and the web 20 near the end face, and then it is desirable to attach the on-site construction side wood covering material 26.

[0027] According to the present embodiment, even if heat enters through the gap between the end faces of the wood covering materials 14 and 26 during a fire, the reinforced gypsum board 28 delays the combustion of the wood covering materials 14 and 26 and delays the rise in the steel material temperature. Further, even if the portion of the wood covering material 26 at the joint part 16 with a small covering thickness burns through, the reinforced gypsum boards 30 and the calcium silicate board 32 prevent the steel frame beam 12 at the joint part 16 from directly receiving the flame, and delay the rise in the steel material temperature. Therefore, the fire resistance performance of the joint part 16 can be ensured.

[0028] By using dry materials such as the reinforced gypsum boards 28, 30 and the calcium silicate board 32 that can be processed on-site for the joint part 16, sizing and construction on-site can be easily performed. Further, by adding fire resistance measures such as increasing the number of the reinforced gypsum boards 28, 30 and filling the gap between the end faces with the gap filler 50, fire resistance performance higher than the specifications verified in the fire resistance test described later can be expected.

[0029] Next, an example of the construction method of the above fire resistance structure will be described. Attach the reinforced gypsum board 28 to the end face 14A of the wood covering material 14. Further, attach the reinforced gypsum board 28 to the end face 26A of the wood covering material 26, and attach the reinforced gypsum board 30 and the calcium silicate board 32 to the recess 44 of the wood covering material 26.

[0030] Next, the steel beams 12 of the wooden steel beams are butted and joined in the axial direction of the members, and the joint part 16 is constructed. Then, the wooden covering material 26 is fitted around the constructed joint part 16.

[0031] As described above, in this embodiment, in order to improve the fire resistance performance of the joint part 16 of the wooden steel beam, the reinforced gypsum board 28 is provided on the end faces of the wooden covering material 14 constructed in the factory and the wooden covering material 26 constructed on site, and the reinforced gypsum board 30 and the calcium silicate board 32 are provided at the parts where the covering thickness becomes small due to the bolt head and screw part. According to this embodiment, the following effects can be obtained.

[0032] (1) The reinforced gypsum board 28 is attached to the end faces of the wooden covering material 14 attached in the factory and the wooden covering material 26 attached on site. Thereby, even if heat invades from the gap between the end faces 14A and 26A of the wooden covering materials 14 and 26 during a fire, the combustion of the wooden covering materials 14 and 26 can be delayed by the reinforced gypsum board 28, and thereby the rise in the steel material temperature can be delayed.

[0033] (2) In the wooden covering material 26 attached on site, the reinforced gypsum board 30 and the calcium silicate board 32 are attached to the parts where the covering thickness becomes small due to the bolt head and screw part. Even if the part with a small covering thickness of the wooden covering material 26 of the joint part 16 burns out, the reinforced gypsum board 30 and the calcium silicate board 32 prevent the joint part 16 of the steel beam 12 from directly receiving the flame, and delay the rise in the steel material temperature. Therefore, the fire resistance performance of the joint part 16 can be ensured.

[0034] <Example> Next, embodiments of the present invention will be described. Note that the following specifications are for verifying the fire resistance performance in a 1-hour fire resistance test. The appearance of the joint part in the wooden-steel hybrid beam verified in the fire resistance test is as shown in Fig. 1. The dimensions and steel type of the steel beam used for the test specimen are BH-1000×150×16×19, with a total length of 3770 mm (SS400). The wooden cladding material is hinoki laminated wood (symmetrically different grades E95-F270), the cladding material thickness of the general part is 80 mm, and the cross-sectional dimensions of the wooden-steel hybrid beam are 1167 mm×317 mm. The thinnest part of the cladding material thickness at the joint is 43.5 mm.

[0035] (Reinforced gypsum board on the end face of the wooden cladding material) One 15-mm thick reinforced gypsum board was provided on each end face of the wooden cladding material constructed at the factory and the wooden cladding material constructed on-site. This way, even if heat penetrates through the gaps between the end faces of the wooden cladding materials, the combustion of the wooden cladding materials can be delayed by the reinforced gypsum board. Note that in the fire resistance test, the thickness of the reinforced gypsum board on the end face was 15 mm, but it is considered that by making it thicker than 15 mm or increasing the number of boards, the heat insulation effect on the wooden side and the heat absorption effect of the gypsum board are improved, and the fire resistance performance is improved.

[0036] (Reinforced gypsum board perpendicular to the end face) As shown in Fig. 2, a 15-mm thick reinforced gypsum board was inserted in the direction perpendicular to the end face on the end face of the wooden cladding material constructed on-site. This is to delay the combustion of the wooden cladding material by this reinforced gypsum board when heat penetrates through the gaps. In the fire resistance test specimen, the reinforced gypsum board perpendicular to the end face was inserted about 20 mm into the side of the wooden cladding material constructed at the factory. Note that by inserting it more than 20 mm, the combustion of the wooden cladding material on the back side of the reinforced gypsum board perpendicular to the end face can be delayed longer, and it is considered that the fire resistance performance is improved.

[0037] (Groove on the end face of the wooden cladding material) The edges of the wooden cladding materials at the joint of the wooden and steel beams were chamfered. This can help delay the rise in the temperature of the steel material of the steel beam when heat enters through the gap during a fire. Also, when fastening the wooden cladding materials constructed on-site with screws or the like, by chamfering, it can be directly fastened to the side of the wooden cladding materials constructed at the factory.

[0038] (Filling of the gap) No gap filler was applied to the test specimens.

[0039] (Coating specifications at locations where the coating thickness is reduced by bolt parts and screw parts) In the test specimens, a reinforced gypsum board (thickness 15 mm) and a calcium silicate board (thickness 6 mm) were attached to the side of the wooden cladding materials constructed on-site. Also, as shown in Fig. 1(2), a reinforced gypsum board (thickness 15 mm) cut out in the shape of the bolt head was attached to the bolt head parts of the upper and lower flanges of the steel beam. As shown in Fig. 1(1) and (4), a reinforced gypsum board (thickness 15 mm) and a calcium silicate board (thickness 6 mm) were attached to the outside of the upper and lower flanges, and a reinforced gypsum board (thickness 15 mm) was attached elsewhere.

[0040] (Fire resistance test results) Next, the results of a 1-hour fire resistance test for the joint using the above test specimens will be described. Note that as a comparative example, a fire resistance test was also conducted on a specification in which no reinforced gypsum board was provided between the edges of the wooden cladding materials, no reinforced gypsum board or calcium silicate board was provided at the parts where the coating thickness was reduced by bolts in the wooden cladding materials constructed on-site, and only the wooden cladding materials were used to cover the joint.

[0041] Figure 5 shows the temperature change of steel materials of each specification by the fire resistance test. Figures 5(1) to (5) correspond to this example, and (6) to (10) correspond to the comparative examples. In the legend in the figure, T-1 to 3 are the temperatures of the joint part (the upper surface of the center of the upper flange joint plate), T-4 to 6 are the temperatures of the joint part (the lower surface of the center of the lower flange joint plate). T-9 and 10 are the temperatures near the joint part (near the end of the upper flange joint plate), T-11 and 12 are the temperatures near the joint part (near the end of the lower flange joint plate), and T-13 is the temperature near the joint part (the web surface between T-9 and 11). T-14 and 15 are the temperatures at the position of the second wood cladding material 100 mm away from the end of the joint plate (the upper surface of the upper flange) (the temperature on the side of the wood cladding material installed on site), T-16 and 17 are the temperatures at the position of the second wood cladding material 100 mm away from the end of the joint plate (the lower surface of the lower flange), and T-18 is the temperature near the joint part (the web surface between T-14 and 16). T-19 to 21 are the temperatures at the small end face position (the upper surface of the upper flange), T-22 to 24 are the temperatures at the small end face position (the lower surface of the lower flange), and T-25 and 26 are the temperatures at the small end face position (the web surface). T-27 and 28 are the temperatures at the position of the first wood cladding material 100 mm away from the small end face position (the upper surface of the upper flange) (the temperature on the side of the wood cladding material installed in the factory), T-29 and 30 are the temperatures at the position of the first wood cladding material 100 mm away from the small end face position (the lower surface of the lower flange), and T-31 is the temperature at the position of the first wood cladding material 100 mm away from the small end face position (the web surface).

[0042] In the comparative example, after heating for 1 hour, the steel material temperature reached 450 °C or more within 24 hours of cooling. In particular, the temperature rise occurred most quickly at the part where the wood cladding material constructed in the factory and the wood cladding material constructed on site meet (Figure 5(9)). It is considered that hot air entered through the gap at the meeting part, and as the red heat continued, it led to inflammation and the steel material temperature exceeded 450 °C.

[0043] On the one hand, in this embodiment, after heating for 1 hour, the maximum temperature of the steel material within 24 hours of cooling was 255.2°C, which was lower than the allowable temperature of 450°C for the steel material. Also, since the part where the factory construction department and the on-site construction department cooperated was 100°C or lower until the end of 1 hour of heating, it is considered that the effect of delaying the combustion of the wooden covering material with the narrow-edge reinforced gypsum board was observed. Furthermore, since no rapid temperature rise was observed in the joint part for 25 hours from the start of heating, it is considered that the rise in the steel material temperature was delayed by providing the reinforced gypsum board and the calcium silicate board.

[0044] From the above, it was shown that the fire resistance performance is improved by providing a reinforced gypsum board on the narrow edge of the wooden covering materials in the joint part and providing a reinforced gypsum board or a calcium silicate board in the part where the covering thickness becomes small due to the bolt head and the threaded part.

[0045] As described above, according to the fire-resistant structure of the wooden-steel hybrid member according to the present invention, there is provided a fire-resistant structure including a second wooden covering material that covers a joint part where wooden-steel hybrid members each composed of a steel frame member and a first wooden covering material that covers the surface of the steel frame member are butt-jointed in the member axis direction and bolted. The fire-resistant structure has a first inorganic fire-resistant material provided between the narrow edges of the first wooden covering material and the narrow edges of the second wooden covering material, and a second inorganic fire-resistant material provided on the surface of the second wooden covering material facing the bolted part. Therefore, even if heat intrudes from the gap between the narrow edges of the first wooden covering material and the narrow edges of the second wooden covering material during a fire, the first inorganic fire-resistant material delays the combustion of the wooden covering material, delaying the rise in the steel material temperature. Also, even if the part with a small covering thickness of the second wooden covering material burns through, the second inorganic fire-resistant material prevents the steel frame member of the joint part from directly receiving the flame, delaying the rise in the steel material temperature. Therefore, the effect of ensuring the fire resistance performance of the joint part can be achieved.

[0046] Further, according to the fire-resistant structure of another wood-steel hybrid member according to the present invention, since the first and second inorganic fire-resistant materials are dry fire-resistant materials that can be processed at the construction site where the wood-steel hybrid member is installed, sizing and construction at the construction site are facilitated.

[0047] Further, according to the fire-resistant structure of another wood-steel hybrid member according to the present invention, since the end faces of the first and second wood covering materials are arranged in a staggered manner, when heat enters from the gap between the end faces during a fire, the rise in the steel temperature of the steel frame member can be delayed. In addition, the second wood covering material can be directly fastened to the first wood covering material with screws or the like, improving workability.

Industrial Applicability

[0048] As described above, the fire-resistant structure of the wood-steel hybrid member according to the present invention is useful for a wood-steel hybrid member composed of wood and steel, and is particularly suitable for ensuring the fire-resistant performance of a joint portion.

Explanation of Reference Numerals

[0049] 10 Wood-steel hybrid member 12 Steel beam (steel frame member) 14 Wood covering material (first wood covering material) 14A, 26A End face 16 Joint portion 18 Flange 20 Web 22 Plate 24 Bolt 26 Wood covering material (second wood covering material) 28 Reinforced gypsum board (first inorganic fire-resistant material) 30 Reinforced gypsum board (second inorganic fire-resistant material) 32 Calcium silicate board (second inorganic fire-resistant material) 34 Fixing member 36 Head 38 Threaded portion 40 Through hole 42 Built-in wood 44 Recessed portion 46 Screw 48 Wood floor 50 Gap filler 100 Fire-resistant structure of wood-steel hybrid member

Claims

1. A fireproof structure of a joint part in which steel frame members protruding from axial ends in the member axis direction of a hybrid wood-steel member composed of a steel frame member and a first wood coating material covering the surface of the steel frame member are butted against each other in the member axis direction and bolted, comprising a second wood coating material provided so as to be continuous with the first wood coating material and covering the joint part, having a first inorganic fireproof material provided between the end faces of the first wood coating material facing each other and the end faces of the second wood coating material, and having a second inorganic fireproof material provided on the surface of the second wood coating material facing the bolted part. A fireproof structure of a hybrid wood-steel member characterized by that.

2. The fireproof structure of the hybrid wood-steel member according to claim 1, wherein the first and second inorganic fireproof materials are dry fireproof materials that can be processed at the construction site where the hybrid wood-steel member is installed.

3. The fireproof structure of the hybrid wood-steel member according to claim 1 or 2, characterized in that the end faces of the first and second wood coating materials are arranged in a dovetail shape.

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