Wooden-steel fire-resistant columns and their construction methods

Abstract

To provide a fire-resistant wooden-steel column and a construction method thereof that prevents the fire-stopping layer inside from being exposed to the outside even when the burnable layer shrinks due to aging or temperature changes, thereby providing excellent fire resistance. [Solution] The wood-steel fire-resistant column 100 comprises a steel column 10 having a rectangular or substantially rectangular cross-sectional shape, a first steel base 20 fixed to the general parts of each side 11 of the steel column 10, a second steel base 25 having an L-shape in plan view and disposed at the corner of the steel column 10 and fixed to the first steel base 20, and a non-combustible board 30 that forms a fire-stopping layer and is fixed to the first steel base 20 and the second steel base 25 by fasteners 81, 82, 83. The burn-through layer 60 comprises a wooden block 40 having an L-shape in plan view and disposed at the corner, and a wooden board 50 whose ends engage with both of the pair of wooden blocks 40 on the outside of the non-combustible board 30, and at least the wooden board 50 is fixed to the steel base 20 by fasteners 85.

Description

Technical Field

[0001] The present invention relates to a wooden steel fire-resistant column and a construction method thereof.

Background Art

[0002] In 2010, the "Law for Promotion of Wood Utilization in Public Buildings, etc." was enacted, and in the construction field, in addition to houses and offices, promotion of wood utilization by wooden construction of large-scale buildings such as commercial facilities has been attempted. Conventional wooden fire-resistant columns applied to these buildings have a structure in which a wooden core material that supports the load of the building is covered with a fire-resistant coating material (fire-stopping layer) such as mortar or gypsum, and the surface layer is covered with wood such as laminated wood (charring layer). Therefore, compared with columns made of reinforced concrete or steel frames having the same supporting force, the cross-sectional dimensions tend to be naturally larger, resulting in a problem that the floor area available indoors decreases.

[0003] Therefore, by forming the core material, which is a load-bearing member, with a steel column, covering the periphery of the steel column with a fire-stopping layer such as a non-combustible board, and covering the periphery of the fire-stopping layer with a charring layer such as a wooden board, it is possible to ensure high load supportability and solve the above problems while promoting the effective use of wood.

[0004] For example, in Patent Document 1, a fire-resistant structure of a column is proposed in which a fire-resistant coating material made of sprayed rock wool, an air layer, a non-combustible thin plate made of steel plate, and a finishing material made of wood are laminated in this order around a column made of a square steel pipe.

Prior Art Documents

Patent Documents

[0007] Incidentally, after the construction of the timber-steel fire-resistant columns, the outermost layer, the wood panel, will shrink due to aging and changes in outside temperature. As adjacent wood panels shrink, gaps may form at their joint ends, potentially exposing the fire-stopping layer inside to the outside. This exposure of the fire-stopping layer to the outside is undesirable because it can reduce the aesthetic appearance and fire resistance of the timber-steel fire-resistant columns.

[0008] The present invention has been made in view of the above problems, and aims to provide a wood-steel fire-resistant column and a method for constructing the same, which has excellent fire resistance, in which even if the burn-out layer shrinks due to aging or temperature changes, the fire-resistant layer inside is prevented from being exposed to the outside. [Means for solving the problem]

[0009] To achieve the above objective, one embodiment of the wood-steel fire-resistant column according to the present invention is: A fire-resistant wooden-steel column comprising a steel column and a wooden burnable layer arranged around it, The steel column having a rectangular or substantially rectangular cross-sectional shape, A first steel base is fixed to the general part of each side of the steel column, A second steel base, which is L-shaped in plan view, is provided at the corner of the steel column and fixed to the first steel base, The structure comprises a non-combustible board that forms a fire-stopping layer, which is fixed to the first steel base and the second steel base by fasteners, The burnable layer comprises an L-shaped wooden block in plan view, which is arranged at the corner, and a wooden board whose ends engage with both of the pair of wooden blocks on the outside of the non-combustible board, and at least the wooden board is fixed to the first steel base by fasteners.

[0010] According to this embodiment, the burnable layer on the outside of the noncombustible board that forms the fire-stopping layer comprises an L-shaped wooden block in plan view, which is arranged at the corner of the wooden-steel fire-resistant column, and a wooden board whose ends engage with both of the pair of wooden blocks on the outside of the noncombustible board. As a result, even if the wooden block and wooden board shrink due to aging or temperature changes, their engaged position is maintained, preventing the fire-stopping layer inside from being exposed to the outside. This makes it possible to suppress the deterioration of the appearance and fire resistance performance of the wooden-steel fire-resistant column caused by the fire-stopping layer being exposed to the outside.

[0011] Furthermore, a first steel base is fixed to the general side of the steel column, a second L-shaped steel base is placed at the corner of the steel column and fixed to the first steel base, and a non-combustible board, which is the fire-stopping layer, and a wooden board, which is the burn-through layer, are fixed to the first steel base with fasteners, resulting in a wood-steel fire-resistant column that is easy to construct and has excellent fire resistance.

[0012] Here, "at least the wooden board is fixed to the first steel base by fasteners" includes both a configuration in which only the wooden board is fixed to the first steel base by fasteners and the wooden block is not fixed, and a configuration in which both the wooden board and the wooden block are fixed to the steel base by their respective fasteners. Even in the former configuration, since the ends of the wooden block and the wooden board are engaged with each other, the wooden board is fixed to the steel base by fasteners, and thus the wooden block is indirectly fixed to the steel base.

[0013] Furthermore, since there is a second steel base at the corner of the steel column, both the wood panel and the wood block, which engage with each other, may be further fixed to the second steel base.

[0014] Even if the ends of both first steel bases, which are fixed to the general parts of the mutually orthogonal sides of the steel column, are extended to the corners of the steel column, it is difficult to join the ends of the two first steel bases together. Furthermore, if the corners of the steel column have a curved R-shaped section, it becomes difficult to extend the ends of the first steel bases to the end of the corner and fix them to the steel column. As a result, it is not possible to extend the first steel bases to the corners of the steel column, resulting in a gap at the corners of the steel column where no steel base is present (the end gap becomes larger), which can become a factor in the intrusion of flames.

[0015] In contrast, in this embodiment, the second L-shaped steel base, which is installed at the corner of the steel column, is fixed to two first steel bases that are fixed to the general parts of the two orthogonal sides of the steel column. This allows the end of the fire-stopping layer, and in some cases the end of the burn-through layer, to be fixed to the second steel base, thereby suppressing the penetration of flames into the interior of the timber-steel fire-resistant column from the end (corner), and improving the fire resistance of the timber-steel fire-resistant column.

[0016] Furthermore, other embodiments of the wood-steel fire-resistant column according to the present invention include: On each side of the steel column, the first steel base is fixed at multiple positions spaced apart in the height direction. Multiple stages of the second steel base are attached to the vertical steel members extending in the height direction at the aforementioned intervals. The vertical steel members are fixed to the corners of the steel columns, and the second steel bases are fixed to the first steel bases located at multiple positions, each corresponding to the first steel base.

[0017] According to this aspect, a plurality of stages of first steel bases are fixed at positions spaced in the height direction in the general part of each side surface of the steel column, a plurality of stages of second steel bases are attached at intervals with respect to the vertical steel members, vertical steel members are fixed to the corner parts of the steel column, and the second steel bases corresponding to the first steel bases at a plurality of positions are fixed respectively. Thus, even when there are first steel bases at a plurality of positions in the height direction, the second steel bases can be efficiently arranged at a plurality of positions as well and fixed to the corresponding first steel bases.

[0018] Moreover, the fixing position of the vertical steel member with respect to the steel column is not limited to the position of the second steel base, and it can be fixed to the steel column at any position where the second steel base does not exist.

[0019] Here, one vertical steel member having a length similar to that of the steel column may be fixed to the steel column, or a plurality of vertical steel members having lengths shorter than the steel column may be fixed to the steel column while joining their ends together.

[0020] Moreover, another aspect of the wooden-steel fire-resistant column according to the present invention is characterized in that the end of the second steel base is engaged with the end of the first steel base, and both ends are fixed.

[0021] According to this aspect, since the end of the second steel base is engaged with the end of the first steel base and both ends are fixed, the ends of the two steel bases can be fixed to each other relatively easily.

[0022] Moreover, another aspect of the wooden-steel fire-resistant column according to the present invention is characterized in that the engaged ends of the first steel base and the second steel base are fastened by a fastener.

[0023] According to this aspect, in addition to the ends of the first steel base and the second steel base being engaged with each other, both ends are fastened by a fastener, so that both ends of the first steel base and the second steel base can be fixed more firmly.

[0024] Furthermore, in another embodiment of the wood-steel fire-resistant column according to the present invention, The end of the aforementioned wooden block is provided with a recess that is concave on the outside. The end of the aforementioned wooden board is provided with a protruding portion on the outside, The protrusion engages with the recess from the outside to form a tongue and groove, and the recess and the protrusion are fixed to each other by a fastener. The wood panel and the non-combustible panel located inside it are fixed to the first steel base by fasteners.

[0025] According to this embodiment, a protruding portion on the outside of the end of the wooden board engages with a recessed portion on the outside of the end of the wooden block from the outside to form a tongue and groove joint, and the recessed portion and the protruding portion are fixed to each other by fasteners, thereby forming a burn-through layer with a tongue and groove joint that makes the internal fire-stopping layer invisible from the outside, while maintaining good attachment of the wooden board to the pair of wooden blocks.

[0026] Furthermore, in another embodiment of the wood-steel fire-resistant column according to the present invention, In a state where the ends of the wooden board are engaged with the ends of the pair of wooden blocks, the outer surface of the wooden board and the outer surface of the wooden blocks are flush.

[0027] According to this embodiment, when the ends of a wooden board are engaged with the ends of a pair of wooden blocks, the outer surface of the wooden board and the outer surface of the wooden blocks are flush, thereby forming a wooden-steel fire-resistant column with excellent aesthetic design.

[0028] Furthermore, other embodiments of the wood-steel fire-resistant column according to the present invention include: The recess of the aforementioned wooden block and the fire-stopping layer inside it are fixed to the second steel base by fasteners, or The tongue-and-groove portion and the fire-stopping layer located inside it are fixed to the second steel base by fasteners.

[0029] According to this embodiment, the recess of the wood block and the fire-stopping layer inside it, and the tongue and groove portion formed by the engagement of the protrusion and recess and the fire-stopping layer inside it are fixed to the second steel base by fasteners, thereby forming a wood-steel fire-resistant column with even greater fire resistance.

[0030] Furthermore, other embodiments of the wood-steel fire-resistant column according to the present invention include: The invention is characterized in that a fire-resistant coating layer is provided on the outer periphery of the aforementioned burnable layer.

[0031] According to this embodiment, by providing a fire-resistant paint layer on the outer periphery of the burnable layer, it is possible to make the burnable layer non-combustible or flame-retardant, thereby forming a wood-steel fire-resistant column with even greater fire resistance.

[0032] Furthermore, in another embodiment of the wood-steel fire-resistant column according to the present invention, The fire-resistant coating layer is characterized by being formed from one of the following: non-combustible paint, semi-non-combustible paint, or flame-retardant paint.

[0033] According to this embodiment, by forming the fire-resistant coating layer with either non-combustible paint, semi-non-combustible paint, or flame-retardant paint, it is possible to form wood-steel fire-resistant columns with various fire-resistant properties.

[0034] Furthermore, one aspect of the construction method for a wood-steel fire-resistant column according to the present invention is: A method for constructing a fire-resistant wooden-steel column, comprising a steel column and a wooden burnable layer arranged around it, Step A involves erecting a steel column having a rectangular or nearly rectangular cross-section, with a first steel base fixed to the general portion of each side, then placing a second steel base in a plan view L-shape at each corner and fixing it to the corresponding first steel base, or erecting a steel column with a first steel base fixed to the general portion of each side, and a second steel base in a plan view L-shape at each corner and fixed to the corresponding first steel base. Step B involves fixing a non-combustible board, which forms a fire-stopping layer, to the first steel substrate and the second steel substrate using fasteners. Step C involves fixing L-shaped wooden blocks, which constitute the combustible layer, to the outside of the non-combustible boards extending in two perpendicular directions at the corner, The present invention is characterized by having step D, in which both ends of the wood board constituting the burnable layer are engaged with both of the pair of wood blocks on the outside of the non-combustible board, and the wood board and the non-combustible board inside it are fixed to the first steel base with fasteners.

[0035] According to this embodiment, a steel column with a first steel base fixed to the general side is erected, and then a second steel base in the shape of an L in plan view is placed at each corner and fixed to the corresponding first steel base, or a steel column with a first steel base fixed to the general side of each side and a second steel base in the shape of an L in plan view placed at each corner and fixed to the corresponding first steel base is erected, and then a non-combustible board that forms a fire-stopping layer is fixed to the first steel base and the second steel base with fasteners, thereby enabling the construction of a wood-steel fire-resistant column with excellent fire resistance under a construction method with excellent workability. Furthermore, at the corners of the timber-steel fire-resistant column, L-shaped wooden blocks in plan view, which constitute the burn-through layer, are fixed to the outside of non-combustible boards extending in two orthogonal directions. On the outside of the non-combustible board, both ends of the wooden boards that constitute the burn-through layer are engaged with both of the pair of wooden blocks, and the wooden boards and the non-combustible boards inside them are fixed to the first steel base with fasteners. This allows the engagement position of both the wooden blocks and wooden boards to be maintained even if they shrink due to aging or temperature changes, preventing the internal burn-stopping layer from being exposed to the outside, thus enabling the construction of a timber-steel fire-resistant column. This makes it possible to suppress the deterioration of the appearance and fire resistance performance of the timber-steel fire-resistant column caused by the exposure of the burn-stopping layer to the outside.

[0036] Furthermore, in another embodiment of the construction method for wood-steel fire-resistant columns according to the present invention, In step A, On each side of the steel column, the first steel base is fixed at multiple positions spaced apart in the height direction. Multiple stages of the second steel base are attached to the vertical steel members extending in the height direction at the aforementioned intervals, The vertical steel members are fixed to the corners of the steel columns, and the second steel bases corresponding to the first steel bases located at multiple positions are fixed to each of them.

[0037] According to this embodiment, by fixing first steel bases at multiple positions spaced apart in the height direction on each side of the steel column, attaching multiple second steel bases at intervals to the vertical steel members, fixing the vertical steel members to the corners of the steel column, and fixing the corresponding second steel bases to the first steel bases at multiple positions, the second steel bases can be efficiently arranged at multiple positions relative to the first steel bases at multiple positions in the height direction, and the corresponding first and second steel bases can be fixed.

[0038] Furthermore, in another embodiment of the construction method for wood-steel fire-resistant columns according to the present invention, The end of the aforementioned wooden block is provided with a recess that is concave on the outside. The end of the aforementioned wooden board is provided with a protruding portion that is projecting outwards. In step D, The present invention is characterized by engaging the protrusion with the recess from the outside to form a tongue and groove joint, fixing the recess and the protrusion to each other with fasteners, and further fixing the wood board and the non-combustible board inside it to the first steel base with fasteners.

[0039] According to this embodiment, a tongue-and-groove joint is formed by engaging a protruding portion on the outside of the end of a wooden board with a recessed portion on the outside of the end of a wooden block, fixing the recessed portion and the protruding portion to each other with fasteners, and further fixing the wooden board and the non-combustible board to the first steel base with separate fasteners. This allows the wooden board to be attached to a pair of wooden blocks with good attachment properties, and a burn-through layer with a tongue-and-groove joint that makes the internal fire-stopping layer invisible from the outside can be formed.

[0040] Furthermore, other embodiments of the construction method for wood-steel fire-resistant columns according to the present invention include: The present invention further comprises step E, which involves forming a fire-resistant coating layer on the outer periphery of the aforementioned burnable layer.

[0041] According to this embodiment, by forming a fire-resistant coating layer on the outer periphery of the combustible layer, it is possible to make the combustible layer non-combustible or flame-retardant, thereby forming a wood-steel fire-resistant column with excellent fire resistance.

[0042] Furthermore, in another embodiment of the construction method for wood-steel fire-resistant columns according to the present invention, In step E, the fire-resistant coating layer is formed by applying one of the following to the outer periphery of the combustible layer: non-combustible paint, semi-non-combustible paint, or flame-retardant paint.

[0043] According to this embodiment, by forming a fire-resistant coating layer by applying one of the following: non-combustible paint, semi-non-combustible paint, or flame-retardant paint, a wood-steel fire-resistant column with various fire-resistant properties can be formed. [Effects of the Invention]

[0044] As can be understood from the above explanation, the present invention relates to a wood-steel fire-resistant column in which a fire-stopping layer is provided around the steel column and a wooden burn-out layer is provided around the fire-stopping layer. In this case, even if the burn-out layer shrinks due to aging or temperature changes, the fire-stopping layer inside is prevented from being exposed to the outside, and furthermore, excellent fire resistance can be achieved. [Brief explanation of the drawing]

[0045] [Figure 1] This is a front view showing the external appearance of an example of a timber-steel fire-resistant column according to the embodiment. [Figure 2] Figure 1 is a view along the line II-II, which is a cross-sectional view looking downwards after cutting the timber-steel fire-resistant column at an intermediate position, and is followed by Figure 9, which is a process diagram of an example of a construction method for the timber-steel fire-resistant column according to the embodiment. [Figure 3] This is a view taken along the line III-III in Figure 2, which is a longitudinal cross-sectional view taken by cutting one side of a timber-steel fire-resistant column at an intermediate position. [Figure 4] This is a process diagram illustrating an example of a construction method for a timber-steel fire-resistant column according to the embodiment. [Figure 5]Following Figure 4, this is a process diagram illustrating an example of a construction method for a timber-steel fire-resistant column according to the embodiment. [Figure 6] This is a perspective view of an example of a second-generation steel substrate. [Figure 7] This is a perspective view showing a configuration in which a second steel base is fixed at multiple positions on the vertical steel members. [Figure 8] Following Figure 5 is a process diagram illustrating an example of a construction method for a timber-steel fire-resistant column according to this embodiment. [Figure 9] Following Figure 8 is a process diagram illustrating an example of a construction method for a timber-steel fire-resistant column according to the embodiment. [Figure 10] This figure corresponds to Figure 2 and is a cross-sectional view of another example of a wood-steel fire-resistant column according to the embodiment. [Modes for carrying out the invention]

[0046] Hereinafter, an example of a fire-resistant wooden-steel column and its construction method according to an embodiment will be described with reference to the attached drawings. In this specification and drawings, substantially identical components may be denoted by the same reference numerals to avoid redundant explanations.

[0047] [Wooden and steel fire-resistant column according to an embodiment and its construction method] An example of a timber-steel fire-resistant column and its construction method according to an embodiment will be described with reference to Figures 1 to 10. Here, Figure 1 is a front view showing the external appearance of an example of a timber-steel fire-resistant column according to an embodiment. Figure 2 is a view taken along the line II-II in Figure 1, which is a cross-sectional view looking downwards after cutting the timber-steel fire-resistant column at an intermediate position. Figure 3 is a view taken along the line III-III in Figure 2, which is a longitudinal cross-sectional view taken at an intermediate position on one side of the timber-steel fire-resistant column. Furthermore, Figures 4, 5, 8, 9, and 2 are, in order, process diagrams of an example of a construction method for a timber-steel fire-resistant column according to an embodiment. Figure 6 is a perspective view of an example of a second steel base, and Figure 7 is a perspective view showing a configuration in which the second steel base is fixed at multiple positions on the vertical steel members.

[0048] The wood-steel fire-resistant column 100 comprises a steel column 10, a non-combustible board 30 (an example of a fire-stopping layer) arranged around the steel column 10, and wood blocks 40 and wood boards 50 (together an example of a burn-through layer) arranged around the non-combustible board 30.

[0049] The steel column 10 is formed from a square steel pipe or a four-sided box column made by welding four steel plates together, and its cross-sectional shape is approximately square, as shown in Figure 2, with the corners of a square (an example of a rectangle) curved.

[0050] Of the four sides 11 of the steel column 10, a first steel base 20 extending in the horizontal direction (for example, horizontally) is fixed to the positions corresponding to the horizontal joints 62 of the vertically adjacent burnt-out layers 60 shown in Figure 1, and a second steel base 25 is fixed to the four corners.

[0051] More specifically, as shown in Figure 3, the first steel base 20 is a channel steel with a web 21, a pair of flanges 22, and lips 23 that are bent at right angles at the ends of each flange 22, and the lips 23 are welded to the side surface 11 of the steel column 10. Here, the first steel base may be formed from channel steel without lips, square steel pipes, etc., in addition to the channel steel with lips shown in the illustrated example.

[0052] Furthermore, as shown in Figure 3, recesses 57 and protrusions 58 are provided on the end faces of the upper and lower ends of the wooden boards 50 (and wooden blocks 40). The protrusions 58 of one wooden board 50 fit into the recess 57 of the other wooden board 50, engaging with each other and connecting the upper and lower wooden boards 50 (and wooden blocks 40).

[0053] As shown in Figure 2, the inner non-combustible board 30A (first layer of non-combustible board) is fastened to the web 21 of the first steel base 20, which is fixed to the general part of each side 11 of the steel column 10, with fasteners 81 such as screws, and the outer non-combustible board 30B (second layer of non-combustible board) is fastened to the inner non-combustible board 30A with separate fasteners 82.

[0054] Furthermore, the second steel base 25, which is installed at each corner of the steel column 10, is fixed by engaging with the first steel base 20, and the inner non-combustible plate 30A and the outer non-combustible plate 30B are further fastened to the second steel base 25 with separate fasteners 83.

[0055] Although not shown in the diagram, the recess 45 at the end of the wooden block 40 and the non-combustible boards 30A and 30B inside it may be further fixed to the second steel base 25 with separate fasteners, or the tongue and groove portion 70 formed by the engagement of the recess 45 at the end of the wooden block 40 and the protrusion 55 at the end of the wooden board 50 and the non-combustible boards 30A and 30B inside it may be further fixed to the second steel base 25 with separate fasteners.

[0056] In this way, the second layer of non-combustible boards 30A and 30B are firmly fixed to both the first steel base 20 and the second steel base 25 throughout their entire areas, thereby enhancing the fire resistance of the wood-steel fire-resistant column 100.

[0057] By providing a second steel base 25 at each corner of the steel column 10, the end of the fire-stopping layer 30 can be fixed to the second steel base 25, thereby suppressing flames from penetrating the interior from the ends (corners) of the wooden-steel fire-resistant column 100 and improving the fire resistance of the wooden-steel fire-resistant column 100.

[0058] Here, the non-combustible board 30 is formed from gypsum board, calcium silicate board, etc., and the fire resistance of the wood-steel fire-resistant column 100 is enhanced by a two-layer structure of gypsum board, etc. The non-combustible board may also be a single-layer structure, or a three-layer structure (three layers) as needed.

[0059] In addition to general gypsum board, gypsum board also includes reinforced gypsum board, ordinary hard gypsum board, sheathing hard gypsum board, moisture-absorbing and releasing reinforced gypsum board, moisture-absorbing and releasing ordinary gypsum board, moisture-absorbing and releasing sheathing hard gypsum board, glass fiber nonwoven fabric gypsum board, glass mat gypsum board, etc.

[0060] The burnable layer 60 comprises L-shaped wooden blocks 40 in plan view, which are fixed to the fire-stopping layer 30 at the four corners of the wooden-steel fire-resistant column 100, and wooden boards 50 whose ends engage with both of the pair of wooden blocks 40 on the outside of the non-combustible board 30.

[0061] Each end of the wooden block 40 is provided with a recessed portion 45 on the outside, and each end of the wooden board 50 is provided with a protruding portion 55 on the outside. In the assembled position shown in Figure 2, on each of the four sides of the wooden steel fire-resistant column 100, a pair of protruding portions 55 on the left and right sides of the wooden board 50 engage with the recessed portion 45 of the wooden block 40 on the left and right sides, respectively, to form a tongue and groove joint 70. In the cross-section of the wooden steel fire-resistant column 100 shown in Figure 2, two tongue and groove joints 70 are formed on each of the four sides, for a total of eight tongue and groove joints 70 formed around the frame-shaped burnable layer 60.

[0062] In the tongue-and-groove section 70, the convex portion 55 and the concave portion 45 are fastened together by fasteners 84. In addition, the wood panel 50 and the two layers of non-combustible panels 30A and 30B inside it are fastened to the steel base 20 by fasteners 85.

[0063] Here, fasteners 84 and 85, such as screws, fasten each component by driving them in from the bottom of a counterbore groove 52 provided on the outer surface 51 of the wooden board 50, and the heads of the fasteners 84 and 85 are housed inside the counterbore groove 52. Although not shown in the illustration, the counterbore groove 52 may be closed with a wooden plug or the like.

[0064] Furthermore, on each side of the wood-steel fire-resistant column 100, the outer surface 51 of the wood panel 50 and the outer surface 41 of the wood block 40 are flush, enhancing the aesthetic appearance in combination with the exposed wood.

[0065] Here, the wood panel 50 is formed from structural plywood, laminated timber (a material made by fixing multiple pieces of lumber together with adhesive or screws), CLT (Cross Laminated Timber) panels, etc. The wood block 40 may be formed from the same material as the wood panel 50, or it may be formed from square timber.

[0066] As shown in Figure 2, the burnable layer 60 on the outside of the non-combustible board 30 that forms the fire-stopping layer comprises an L-shaped wooden block 40 fixed to the fire-stopping layer 30 at the corner of the wooden steel fire-resistant column 100, and a wooden board 50 on the outside of the non-combustible board 30 whose ends engage with both of the pair of wooden blocks 40. As a result, even if the wooden blocks 40 and wooden board 50 shrink in the X2 or X1 direction due to aging or temperature changes, their engagement position is maintained, preventing the fire-stopping layer 30 inside from being exposed to the outside.

[0067] This prevents a decrease in the aesthetic appearance and fire resistance performance of the wood-steel fire-resistant column 100, which would result from the fire-stopping layer 30 being exposed to the outside.

[0068] Here, the overlap of the protrusion 55 relative to the recess 45 in the tongue-and-groove section 70 is set such that, for example, the minimum necessary overlap remains when the wood board 50 or wood block 40 shrinks by the maximum amount of shrinkage, such as the amount of shrinkage of the wood board 50 or wood block 40 during the designed service life or the amount of shrinkage of the wood board 50 or wood block 40 due to expected annual temperature changes.

[0069] Next, an example of a construction method for a wood-steel fire-resistant column according to the embodiment will be outlined.

[0070] First, as shown in Figure 4, the steel columns 10, to which the first steel base 20 is fixed to the general parts of each side 11, are transported to the site and erected there.

[0071] Next, as shown in Figure 5, the second steel base 25 is fixed to both of the mutually perpendicular first steel bases 20 at each corner of the erected steel column 10, thereby surrounding the steel column 10 in a frame-like manner with the first steel base 20 and the second steel base 25 at the position corresponding to the horizontal joint 62 shown in Figure 1.

[0072] As shown in Figure 6, the second steel base 25 comprises an L-shaped vertical plate 25A made of steel plate, a pair of L-shaped flanges 25B made of steel plate fixed to the upper and lower ends of the L-shaped vertical plate 25A, and vertical ribs 25C made of steel plate fixed to the L-shaped vertical plate 25A and the pair of L-shaped flanges 25B. The engaging piece 25a of the L-shaped flange 25B that is outside the vertical rib 25C is provided with a pilot hole 25b through which a fastener is inserted.

[0073] Each engaging piece 25a engages with the underside of the flange of the first steel base 20, and the flange of the first steel base 20 and the engaging piece 25a of the second steel base 25 are fastened together by fasteners such as screws.

[0074] Here, as shown in Figure 7, a corner steel unit 28 may be used in which multiple stages of second steel bases 25 are attached to vertical steel members 27 extending in the height direction, at positions corresponding to each horizontal joint 62 (see Figure 1).

[0075] Corner steel member units 28 are installed at each corner of the steel column 10, vertical steel members 27 are fixed to the steel column 10 with fasteners such as screws, and each second steel base 25 is engaged with and fixed to the corresponding first steel base 20.

[0076] By applying the corner steel unit 28, the second steel base 25 can be efficiently positioned at multiple levels relative to the first steel base 20, which is located at multiple levels in the height direction, and the corresponding first steel base 20 and second steel base 25 can be fixed together. Furthermore, by having vertical steel members 27, the vertical steel members 27 can be fastened to the steel column 10 at any position, regardless of the position of the second steel base 25, using fasteners.

[0077] Alternatively, instead of the method shown in the illustration, a steel column 10 in which a first steel base 20 is fixed to the general part of each side 11 and a second steel base 25 is fixed to each corner may be transported to the site and erected on site (Above, Step A).

[0078] Next, as shown in Figure 8, two layers of non-combustible boards 30A and 30B, which form a fire-stopping layer, are sequentially fixed to the first steel base 20 and the second steel base 25 via fasteners 81, 82, and 83 (Step B).

[0079] Next, as shown in Figure 9, at each of the four corners, L-shaped wooden blocks 40 are temporarily fixed to the outside of the non-combustible board 30, which extends in two orthogonal directions. Here, the temporary fixing is done by driving staples (not shown) into the non-combustible board 30 through the recesses 45 of the wooden blocks 40 (Step C).

[0080] After temporarily fixing the wooden blocks 40 to each corner, as shown in Figure 2, on the outside of each non-combustible board 30 on the four sides, the protrusions 55 at both ends of the wooden board 50 are engaged with the recesses 45 on both ends of the pair of wooden blocks 40 to form tongue and groove joints 70, thereby forming a combustible layer 60 consisting of multiple (four in the illustrated example) wooden blocks 40 and multiple (four in the illustrated example) wooden boards 50. Then, the wooden boards 50 and the non-combustible boards 30A and 30B inside them are fixed to the steel base 20 with fasteners 85.

[0081] Here, the pair of wooden blocks 40 that were temporarily fixed to the non-combustible board 30 are permanently fixed to the steel base 20 together with the wooden board 50 when the wooden board 50 is fixed to the steel base 20 with fasteners 85, with the recesses 45 of the wooden blocks 40 being pressed from the outside by the protrusions 55 of the wooden board 50 (Step D).

[0082] According to the construction method shown in the illustration, a steel column 10 with a first steel base 20 fixed to the general part of the side surface 11 is erected, a second steel base 25 is placed at the corner of the steel column 10 and fixed to the first steel base 20, and a non-combustible board 30 that forms a fire-stopping layer is fixed to the first steel base 20 and the second steel base 25 with fasteners 81, 82, and 83, thereby improving constructability and forming a wood-steel fire-resistant column 100 with excellent fire resistance.

[0083] Furthermore, at the corner of the wood-steel fire-resistant column 100, a tongue-and-groove joint 70 is formed by engaging a protruding portion 55, which is projecting from the outside at the end of the wood panel 50, with a recessed portion 45, which is recessed on the outside at the end of the wood block 40. The recessed portion 45 and the protruding portion 55 are then fixed to each other with fasteners 84, and the wood panel 50 and the non-combustible board 30 are further fixed to the first steel base 20 with separate fasteners 85. This allows the wood panel 50 to be attached to a pair of wood blocks 40 with good attachment properties, and a burnable layer 60 with a tongue-and-groove joint 70 that makes the internal fire-stopping layer 30 invisible from the outside can be formed.

[0084] Next, with reference to Figure 10, another example of a wood-steel fire-resistant column according to the embodiment will be described. The illustrated wood-steel fire-resistant column 100A differs from the wood-steel fire-resistant column 100 in that a fire-resistant coating layer 90 is formed on the outer periphery (the entire area of ​​the four sides) of the burnable layer 60.

[0085] Here, the fire-resistant coating layer 90 is formed by applying either a non-combustible paint, a semi-non-combustible paint, or a flame-retardant paint to the outer periphery of the combustible layer 60.

[0086] Thus, by forming a fire-resistant paint layer 90 on the outer periphery of the burnable layer 60 located on the outer periphery of the wood-steel fire-resistant column 100A, the wood-steel fire-resistant column 100A can satisfy the interior finish restrictions (Article 35-2) and exterior finish restrictions (Article 21) stipulated in the Building Standards Act. Here, "special buildings" as defined in Article 35-2 of the Building Standards Act include theaters, cinemas, auditoriums, public halls, hospitals, hotels, inns, schools, department stores, amusement parks, warehouses, etc. On the other hand, "large-scale buildings" as defined in Article 21 of the Building Standards Act include buildings with four or more stories, buildings exceeding 16m in height, and buildings with a total floor area of ​​3000m². 2 This includes buildings exceeding a certain size.

[0087] Non-combustible paints, semi-non-combustible paints, and flame-retardant paints are all included in "fire-resistant paints," but each type of paint imparts its own unique fire resistance performance to the combustible layer 60.

[0088] Specifically, by applying non-combustible paint, the combustible layer 60 will not burn during the 20 minutes after heating begins at a temperature of 750°C, thereby preventing harmful damage to the combustible layer 60 from a fire prevention standpoint, and preventing the generation of harmful smoke or gases for evacuation purposes.

[0089] On the other hand, by applying a semi-non-combustible paint, the combustible layer 60 will not burn during the 10 minutes after heating begins at a temperature of 750°C, thus preventing harmful damage to the combustible layer 60 from a fire prevention standpoint, and preventing the generation of harmful smoke or gases from an evacuation standpoint.

[0090] On the other hand, by applying flame-retardant paint, the combustible layer 60 will not burn during the first 5 minutes after heating begins at a temperature of 750°C, thus preventing harmful damage to the combustible layer 60 from a fire prevention standpoint, and preventing the generation of harmful smoke or gases from an evacuation standpoint.

[0091] The construction method for the 100A timber-steel fire-resistant column involves, following step D described above, applying a fire-resistant coating such as non-combustible paint, semi-non-combustible paint, or flame-retardant paint to the outer perimeter (the entire area of ​​all four sides) of the burnable layer 60, thereby forming a fire-resistant coating layer 90 around the outer perimeter of the burnable layer 60, and then constructing the 100A timber-steel fire-resistant column. Here, depending on the required fire resistance performance, a suitable coating is selected from among non-combustible paint, semi-non-combustible paint, and flame-retardant paint and applied (step E).

[0092] According to this construction method, by forming a fire-resistant paint layer 90 on the outer periphery of the burnable layer 60, the burnable layer 60 can be made non-combustible or flame-retardant, and a wood-steel fire-resistant column 100A with excellent fire resistance can be formed. Here, since the fire-resistant paint layer 90 is transparent, the fire-resistant paint layer 90 does not obstruct the visibility of the burnable layer 60 made of wood, resulting in a wood-steel fire-resistant column 100 with excellent appearance and design.

[0093] Furthermore, other embodiments may be used in which other components are combined with the configurations listed in the above embodiments, and the present invention is not limited in any way to the configurations shown herein. In this regard, modifications can be made without departing from the spirit of the present invention, and can be appropriately determined according to the application form. [Explanation of Symbols]

[0094] 10: Steel pillar 11: Side view 20: First steel base (channel steel, channel steel with lip) 21: Web 22: Flange 23: Lip 25:Second steel base 25A:L-shaped vertical plate 25a: Engagement piece 25b: Pilot hole 25B: L-shaped flange 25C: Vertical ribs 27: Vertical steel members 28: Corner steel unit 30: Non-combustible board (fire-stopping layer) 30A: Inner non-combustible board (non-combustible board, fire-stopping layer) 30B: Outer non-combustible board (non-combustible board, fire-stopping layer) 40: Wooden Block 41:Outer surface 45: Recess (end) 50: Wood board 51:Outer surface 52: Counterbore groove 55: Convex part (end) 60: Burning layer 62: Horizontal joints 70: Sanebu 81, 82, 83, 84, 85: Fasteners 90: Fireproof paint layer 100, 100A: Wood-steel fire-resistant column

Claims

1. A fire-resistant wooden-steel column comprising a steel column and a wooden burnable layer arranged around it, The steel column having a rectangular or substantially rectangular cross-sectional shape, A first steel base is fixed to the general parts of each side of the steel column, A second steel base, which is L-shaped in plan view, is provided at the corner of the steel column and fixed to the first steel base, The structure comprises a non-combustible board that forms a fire-stopping layer, which is fixed to the first steel base and the second steel base by fasteners, A wood-steel fire-resistant column characterized in that the burnable layer comprises an L-shaped wood block in plan view, which is arranged at the corner, and a wood board whose ends engage with both of the pair of wood blocks on the outside of the non-combustible board, and at least the wood board is fixed to the first steel base by fasteners.

2. On each side of the steel column, the first steel base is fixed at multiple positions spaced apart in the height direction. Multiple stages of the second steel base are attached to the vertical steel members extending in the height direction at the aforementioned intervals. The wood-steel fire-resistant column according to claim 1, characterized in that the vertical steel members are fixed to the corners of the steel column, and the second steel bases corresponding to the first steel bases located at multiple positions are fixed to each of them.

3. The wood-steel fire-resistant column according to claim 1 or 2, characterized in that the end of the second steel base engages with the end of the first steel base, and both ends are fixed together.

4. The wood-steel fire-resistant column according to claim 3, characterized in that the mutually engaged ends of the first steel base and the second steel base are fastened together by fasteners.

5. The end of the aforementioned wooden block is provided with a recess that is concave on the outside. The end of the aforementioned wooden board is provided with a protruding portion on the outside, The protrusion engages with the recess from the outside to form a tongue and groove, and the recess and the protrusion are fixed to each other by a fastener. The wood-steel fire-resistant column according to claim 1 or 2, characterized in that the wood-frame board and the non-combustible board located inside it are fixed to the first steel base by fasteners.

6. The wood-steel fire-resistant column according to claim 1 or 2, characterized in that, when the ends of the wood board are engaged with the ends of a pair of wood blocks, the outer surface of the wood board and the outer surface of the wood blocks are flush.

7. The recess of the aforementioned wooden block and the fire-stopping layer inside it are fixed to the second steel base by fasteners, or The wood-steel fire-resistant column according to claim 5, characterized in that the tongue-and-groove portion and the fire-stopping layer located inside it are fixed to the second steel base by fasteners.

8. The wood-steel fire-resistant column according to claim 1 or 2, characterized in that a fire-resistant paint layer is provided on the outer periphery of the burnable layer.

9. The wood-steel fire-resistant column according to claim 8, characterized in that the fire-resistant coating layer is formed of any one of non-combustible paint, semi-non-combustible paint, or flame-retardant paint.

10. A method for constructing a fire-resistant wooden-steel column, comprising a steel column and a wooden burnable layer arranged around it, Step A involves erecting a steel column having a rectangular or substantially rectangular cross-section, with a first steel base fixed to the general portion of each side, then placing a second steel base in a plan view L-shape at each corner and fixing it to the corresponding first steel base, or erecting a steel column with a first steel base fixed to the general portion of each side, and a second steel base in a plan view L-shape at each corner and fixed to the corresponding first steel base. Step B involves fixing a non-combustible board, which forms a fire-stopping layer, to the first steel substrate and the second steel substrate using fasteners. Step C involves fixing L-shaped wooden blocks, which constitute the combustible layer, to the outside of the non-combustible boards extending in two perpendicular directions at the corner, A method for constructing a wood-steel fire-resistant column, characterized by having step D, which involves engaging both ends of the wood board constituting the burnable layer with both of the pair of wood blocks on the outside of the non-combustible board, and fixing the wood board and the non-combustible board inside it to the first steel base with fasteners.

11. In step A, On each side of the steel column, the first steel base is fixed at multiple positions spaced apart in the height direction. Multiple stages of the second steel base are attached to the vertical steel members extending in the height direction at the aforementioned intervals, A method for constructing a wood-steel fire-resistant column according to claim 10, characterized in that the vertical steel members are fixed to the corners of the steel column, and the second steel bases corresponding to the first steel bases located at multiple positions are fixed.

12. The end of the aforementioned wooden block is provided with a recess that is concave on the outside. The end of the aforementioned wooden board is provided with a protruding portion that is projecting outwards. In step D, A method for constructing a wood-steel fire-resistant column according to claim 10 or 11, characterized in that the protrusion is engaged with the recess from the outside to form a tongue and groove joint, the recess and the protrusion are fixed to each other with fasteners, and the wood board and the non-combustible board inside it are fixed to the first steel base with fasteners.

13. The method for constructing a wood-steel fire-resistant column according to claim 10 or 11, further comprising step E, which involves forming a fire-resistant paint layer on the outer periphery of the burnable layer.

14. The method for constructing a wooden-steel fire-resistant column according to claim 13, characterized in that in step E, the fire-resistant paint layer is formed by applying one of the following to the outer periphery of the burnable layer: non-combustible paint, semi-non-combustible paint, or flame-retardant paint.

Images