Wood-steel fireproof column and construction method therefor

Abstract

To provide a wood-steel fireproof column and a construction method therefor, which do not require labor and time for dimensional coordination at worksites.SOLUTION: A wood-steel fireproof column 100 consists of a steel column 10 and a wooden burning layer 40 arranged on the circumference of the steel column, the wood-steel fireproof column comprising: a steel column 10 with a rectangular or semi-rectangular sectional shape; a steel substrate 20 fixed on each side face 11 of the steel column 10; a non-inflammable plate 30 forming a fire stoppage layer which is fixed on the steel substrate 20 with fasteners 81, 82, 83, 84; and a wooden plate 40 forming a burning layer, where a gap 70 is provided between the non-inflammable plate 30 and the wooden plate 40 for construction adjustment purpose. A filler plate 60 with a thickness equivalent to the gap 70 is interposed in the gap 70.SELECTED DRAWING: Figure 3

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 Promoting the Use of Wood in Public Buildings, etc." was enacted. In the construction field, in addition to houses and offices, the use of wood is promoted by making large-scale buildings such as commercial facilities wooden. 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 (burning allowance layer) such as laminated wood. Therefore, compared with columns made of reinforced concrete structures or steel frame structures 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 burning allowance layer such as a wooden board, it is possible to ensure high load supportability, solve the above problems, and achieve effective utilization 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 order around a column made of a square steel pipe.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] When constructing a wooden-steel fire-resistant column with the above-mentioned steel column as the core material on-site, after erecting the steel column, a fire-stopping layer is constructed around it, and further a charring layer is constructed around the fire-stopping layer. When constructing by laminating a plurality of members laterally on-site in this way, the thickness of each member includes manufacturing errors, and furthermore, construction errors may occur when connecting the members to each other. Therefore, due to the accumulation of these various errors, the finished dimensions of the wooden-steel fire-resistant column often do not conform to the designed dimensions.

[0007] Therefore, at the construction site, among the plurality of side surfaces of the steel column, on the side surface with a larger dimension, on-site processing such as thinning (shaving) the thickness of the wooden board that becomes the charring layer is carried out, or on-site adjustment such as slightly shifting the assembly mode of the members while adjusting the overall dimensions is inevitably required, and there are problems such as the fact that such on-site processing and on-site adjustment require labor and time.

[0008] The present invention has been made in view of the above problems, and an object thereof is to provide a wooden-steel fire-resistant column and a construction method thereof that do not require labor and time for on-site dimension adjustment.

Means for Solving the Problems

[0009] In order to achieve the above object, one aspect of the wooden-steel fire-resistant column according to the present invention is a wooden-steel fire-resistant column including a steel column and a wooden charring layer disposed around the steel column, wherein the steel column has a rectangular or substantially rectangular cross-sectional shape, a steel base fixed to each side surface of the steel column, and a non-combustible board forming a fire-stopping layer and a wooden board forming the charring layer, which are fixed to the steel base by fasteners, characterized in that a gap for construction adjustment is provided between the non-combustible board and the wooden board, and a filler plate having a thickness corresponding to the gap is interposed in the gap.

[0010] According to this aspect, a steel base is fixed to the side surface of a steel column, and a non-combustible plate, which is a fire-resistant layer, and a wooden plate, which is a charring layer, are fixed to the steel base with fasteners, thereby forming a wooden-steel fire-resistant column with excellent workability.

[0011] Also, a gap for construction adjustment is provided between the non-combustible plate, which is a fire-resistant layer, and the wooden plate, which is a charring layer, and a filler plate having a thickness corresponding to the gap is interposed in the gap. By stacking non-combustible plates on the side of the steel column, measuring the surface of the non-combustible plate, and absorbing the error from the design value (design position of the non-combustible plate) in the gap for construction adjustment, considering the gap for construction adjustment and the generated error, a filler plate with a thickness corresponding to the remaining gap is installed in the gap, and a wooden plate is further installed outside it. Thus, the wooden-steel fire-resistant column can be constructed smoothly without taking time and effort for dimensional adjustment at the site.

[0012] For example, for the final design dimensions, the gap for construction adjustment on each side surface of the steel column is preset in the range of about 5 mm to 10 mm in advance. By attaching non-combustible plates to each side surface of the steel column and measuring the surface position of each non-combustible plate, the error between the surface of each non-combustible plate and the design value is determined. Then, by considering the thickness of the wooden plate to be installed later, the width of the finally remaining gap (gap for construction adjustment) is determined, and a filler plate with a thickness corresponding to the determined width is installed in the gap. Therefore, it is desirable to prepare filler plates with various thicknesses that differ in thickness in millimeters at the site.

[0013] Another aspect of the wooden-steel fire-resistant column according to the present invention is a joint base is disposed outside the filler plate, and the wooden plate is disposed outside the joint base, the joint base is fixed to the steel base together with the filler plate and the non-combustible plate by the fasteners, and the wooden plate is fixed to the joint base.

[0014] According to this aspect, a joint base is disposed outside the filler plate, a wooden plate is disposed outside the joint base, the joint base is fixed to the steel base together with the filler plate and the non-combustible plate by fasteners, and the wooden plate is fixed to the joint base, whereby the attachability of each member including the filler plate is improved and the workability can be enhanced. Here, the joint base may be either a wooden plate or a non-combustible plate.

[0015] Moreover, another aspect of the wooden-steel fire-resistant column according to the present invention is characterized in that a wooden connecting piece is fitted into a connecting groove straddling the ends of two adjacent said wooden plates, and the ends of the wooden plates are connected to each other.

[0016] According to this aspect, since a wooden connecting piece is fitted into a connecting groove straddling the ends of two adjacent wooden plates and the ends of the wooden plates are connected to each other, the connection strength of the ends of the wooden plates is increased, and the intrusion of flames during a fire from the joint portion at the ends of the wooden plates into the interior can be suppressed. Here, when fitting the connecting piece, the connection strength can be further increased by using an adhesive in combination.

[0017] Moreover, another aspect of the wooden-steel fire-resistant column according to the present invention is characterized in that there are respective gaps outside the four side surfaces of the steel column, and filler plates having thicknesses corresponding to the respective gaps are disposed.

[0018] According to this aspect, since filler plates having thicknesses corresponding to the respective gaps outside the four side surfaces of the steel column are disposed, a wooden-steel fire-resistant column in which all side surfaces satisfy the design values can be formed.

[0019] Moreover, one aspect of the construction method of the wooden-steel fire-resistant column according to the present invention is a construction method of a wooden-steel fire-resistant column including a steel column and a wooden char layer disposed around the steel column, the method comprising: a step A of building the steel column having a rectangular or substantially rectangular cross-sectional shape and having steel bases fixed to each side surface. Step B: Fixing a non-combustible plate forming a fire-stopping layer to the steel base with fasteners and measuring the position of the surface of the non-combustible plate. Step C: Fixing a filler plate having a thickness corresponding to the construction adjustment gap, which is left as a result of the measurement in Step B, to the steel base with fasteners with respect to the preset gap between the fire-stopping layer and the char layer, and directly or indirectly fixing a wooden plate forming the char layer to the steel base with fasteners so as to sandwich the filler plate. It is characterized by having this.

[0020] According to this aspect, a construction adjustment gap is set between the non-combustible plate, which is the fire-stopping layer, and the wooden plate, which is the char layer. The non-combustible plates are stacked on the side of the steel column, the surface of the non-combustible plate is measured, and while absorbing the error from the design value with the construction adjustment gap, a filler plate with a thickness corresponding to the remaining gap is installed in the gap considering the construction adjustment gap and the generated error, and a wooden plate is further installed outside it. Thus, the wooden-steel fire-resistant column can be smoothly constructed without taking time and effort for dimensional adjustment at the site.

[0021] Here, "fixing the wooden plate to the steel base directly or indirectly with fasteners" literally means, in addition to directly fixing the wooden plate to the steel base, fixing a joint base or the like to the steel base and fixing the wooden plate to the joint base, thereby indirectly fixing the wooden plate to the steel base.

[0022] Also, in another aspect of the method for constructing a wooden-steel fire-resistant column according to the present invention, A joint base is disposed outside the filler plate, and the wooden plate is disposed outside the joint base. In Step C, The filler plate and the joint base are fixed to the steel base with fasteners, and the wooden plate is fixed to the joint base with fasteners. It is characterized by this.

[0023] According to this aspect, a joint base is disposed outside the filler plate, a wooden plate is disposed outside the joint base, the joint base is fixed to the steel base together with the filler plate and the non-combustible plate by fasteners, and the wooden plate is fixed to the joint base, whereby the attachability of each member including the filler plate is improved and the workability can be enhanced.

[0024] Further, in another aspect of the method for constructing a wooden-steel fire-resistant column according to the present invention, in the step B, the surface positions of the non-combustible plates on the outer sides of the four sides of the steel column are measured, in the step C, a filler plate having a thickness corresponding to each construction adjustment gap remaining as a result of the measurement in the step B is fixed to the corresponding steel base by fasteners.

[0025] According to this aspect, by measuring the surface positions of the non-combustible plates on the outer sides of the four sides of the steel column and arranging filler plates having thicknesses corresponding to the respective remaining gaps determined in consideration of the preset construction adjustment gaps and the measured values, a wooden-steel fire-resistant column in which all sides satisfy the design values can be formed.

Effect of the Invention

[0026] As can be understood from the above description, according to the wooden-steel fire-resistant column and the method for constructing the same of the present invention, a wooden-steel fire-resistant column and a method for constructing the same that do not require labor and time for dimensional adjustment at the site can be provided.

Brief Description of the Drawings

[0027]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Mode for Carrying Out the Invention

[0028] Hereinafter, an example of a wooden-steel fire-resistant column and its construction method according to an embodiment will be described with reference to the accompanying drawings. In the present specification and the drawings, substantially the same components may be denoted by the same reference numerals, and redundant descriptions may be omitted.

[0029] [Wooden-Steel Fire-Resistant Column and Its Construction Method According to Embodiment] With reference to FIGS. 1 to 5, an example of a wooden-steel fire-resistant column and its construction method according to an embodiment will be described. Here, FIG. 1 is a front view showing an appearance of an example of a wooden-steel fire-resistant column according to the embodiment. Further, FIG. 2 is a sectional view taken along the arrow II-II of FIG. 1, showing a cross section viewed from below after cutting at an intermediate position of the wooden-steel fire-resistant column, and FIG. 3 is a sectional view taken along the arrow III-III of FIG. 2, showing a longitudinal section cut at an intermediate position of one side surface of the wooden-steel fire-resistant column. Furthermore, FIG. 4 is a perspective view showing a state in which a filler plate and a joint base are attached to a side surface of a non-combustible plate, and FIG. 5 is a perspective view showing a joining mode between ends of wooden plates.

[0030] The wooden-steel fire-resistant column 100 includes a steel column 10, a non-combustible plate 30 (an example of a fire-stopping layer) disposed around the steel column 10, and a wooden plate 40 (an example of a charring layer) disposed around the non-combustible plate 30.

[0031] The steel column 10 is formed by a square steel pipe or a four-sided box column formed by welding four steel plates to each other, and its cross-sectional shape is a substantially square shape in which the corners of a square (an example of a rectangle) are curved as shown in FIG. 2.

[0032] Among the four sides 11 of the steel column 10, a steel base 20 extending in the lateral direction (e.g., horizontal direction) is fixed at a position corresponding to the horizontal joint 42 of the wooden boards 40 adjacent in the vertical direction shown in FIG. 1.

[0033] More specifically, as shown in FIG. 3, the steel base 20 is a channel steel with a lip, comprising a web 21 and 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 of the steel column 10. Here, the steel base may be formed of a channel steel without a lip, a square steel pipe, etc., in addition to the channel steel with a lip shown in the illustrated example.

[0034] An inner non-combustible board 30A (the first layer of non-combustible board) is fastened to the web 21 of the steel base 20 fixed to each side 11 of the steel column 10 with fasteners 81 such as screws, and an outer non-combustible board 30B (the second layer of non-combustible board) is fastened to the inner non-combustible board 30A with separate fasteners 82.

[0035] Here, the non-combustible board 30 is formed of a gypsum board, a calcium silicate board, etc., and by adopting a two-layer structure such as a gypsum board, etc., the fire resistance performance of the wooden-steel fire-resistant column 100 is enhanced. Note that the non-combustible board may have a single-layer structure, or may have a three-layer structure (three-ply), etc., as required.

[0036] In addition, the gypsum board includes, in addition to a general gypsum board, a reinforced gypsum board, a normal hard gypsum board, a seaming hard gypsum board, a moisture absorption and desorption reinforced gypsum board, a moisture absorption and desorption normal gypsum board, a moisture absorption and desorption seaming hard gypsum board, a gypsum board with glass fiber non-woven fabric, a glass mat gypsum board, etc.

[0037] An outer joint base 50 is disposed outside the outer non-combustible board 30B with a gap 70 for construction adjustment in between, and a wooden board 40 is disposed outside the joint base 50.

[0038] More specifically, as shown in FIG. 3, in the gap 70 for construction adjustment with a width t1, a filler plate 60 having a thickness corresponding to the width t1 of the gap 70 is disposed, and a joint base 50 is disposed outside the filler plate 60. The filler plate 60 is provided with through holes 61, and a fastener 83 driven from the outside of the joint base 50 passes through the through holes 61, passes through the two-layer non-combustible plates 30, and is fastened to the web 21 of the steel base 20.

[0039] Here, the joint base 50 may be either a non-combustible plate or a wooden plate.

[0040] FIG. 4 shows a state in which a filler plate 60 is disposed in the gap 70 for construction adjustment set outside the outer non-combustible plate 30B, and the filler plate 60 and the joint base 50 disposed outside thereof are fastened to the steel base 20 with a fastener 83.

[0041] An adhesive 55 is applied to the outer surface of the joint base 50, the joint base 50 is accommodated in the recesses 43 of the upper and lower wooden plates 40 while forming a horizontal joint 42, and a fastener 84 is driven from the counterbored groove 45 facing the outer surface of the wooden plate 40 to fasten the joint base 50. After fastening the wooden plate 40 with the fastener 84, the counterbored groove 45 is closed with a wooden plug 46, so that a wooden-steel fire-resistant column 100 is formed with the outer surface of the wooden plate 40 exposed in a manner that no metal member is visible on the outer surface of the wooden plate 40. Here, the application of the adhesive 55 to the outer surface of the joint base 50 may be omitted.

[0042] Here, the wooden plate 40 is formed of a structural plywood, a glued laminated timber (a material in which a plurality of sawn timbers are fixed with an adhesive or screws, etc.), a CLT (Cross Laminated Timber) panel, or the like.

[0043] Also, as shown in FIGS. 2 and 5, a wooden connecting piece 48 is fitted into a connecting groove 47 straddling the ends 44 of two adjacent wooden plates 40, and the ends 44 of the wooden plates 40 are connected to each other. An adhesive may be applied between the connecting piece 48 and the connecting groove 47. With this connection structure, the connection strength between the ends 44 of the wooden plates 40 is increased, and the intrusion of flames from the joint of the ends 44 of the wooden plates 40 into the interior during a fire can be suppressed.

[0044] Next, an example of the construction method of the wooden-steel fire-resistant column according to the embodiment will be outlined.

[0045] First, as shown in FIGS. 1 and 2, a steel column 10 with a steel base 20 fixed to each side surface 11 is transported to the site and erected at the site (Step A).

[0046] Next, two non-combustible plates 30A and 30B for forming a fire-stopping layer are sequentially fixed to the steel base 20 via fasteners 81 and 82, and the position of the surface of the non-combustible plate 30 (the outer non-combustible plate 30B in the illustrated example) is measured (Step B).

[0047] Here, a construction adjustment gap 70 of about several mm to 10 mm, for example, is preset between the fire-stopping layer 30 and the char layer 40, and the thicknesses of the non-combustible plate 30 and the wooden plate 40 are set so as to ensure this gap 70.

[0048] The surface position of the outer non-combustible plate 30B on each side surface 11 of the steel column 10 is measured, and based on the width of the preset construction adjustment gap 70, the construction error based on the measurement result, and further based on the thickness of the wooden plate 40 installed in the outermost layer and the design position of the surface of the wooden plate 40, etc., the width of the construction adjustment gap 70 to be finally adjusted by the filler plate 60 is set. Then, a filler plate 60 with a thickness corresponding to the width of this gap 70 is selected, and both the joint base 50 and the filler plate 60 are fastened to the surface of the non-combustible plate 30.

[0049] Note that the width of the construction adjustment gap 70 preset in advance is set based on, for example, past empirical rules, etc., and may be set to about several mm to 10 mm as described above.

[0050] Finally, a wooden board 40 is disposed outside the joint base 50, and the wooden board 40 is fastened to the joint base 50 by a fastener 84. On the outside of all side surfaces 11 of the steel column 10, by fastening the wooden board 40 to the joint base 50, the steel-wood fire-resistant column 100 is constructed (the above is Process C).

[0051] In this way, a gap 70 for construction adjustment is provided in advance between the non-combustible board 30 and the wooden board 40. After fixing the non-combustible board 30 to the steel base 20, various errors such as the manufacturing error of the steel column 10, the construction error during erection, further the manufacturing error of the non-combustible board 30, and the construction error when fixing the non-combustible board 30 to the steel base 20 are absorbed by the gap 70 for construction adjustment. For the finally remaining gap determined from the designed position of the surface of the wooden board 40, a filler plate 60 with a thickness corresponding to the width of the gap is interposed in the gap 70, so that the steel-wood fire-resistant column 100 can be smoothly constructed without taking time and effort for dimensional adjustment at the site.

[0052] Note that other embodiments in which other components are combined with the configurations and the like described in the above embodiments may also be possible, and the present invention is not limited to the configurations shown here at all. In this regard, it can be changed without departing from the gist of the present invention and can be appropriately determined according to the application form.

Explanation of Reference Numerals

[0053] 10: Steel column 11: Side surface 20: Steel base (grooved steel, grooved steel with lip) 21: Web 22: Flange 23: Lip 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 board (charring layer) 42: Horizontal joint 43: Concave part 44: End part 45: Seat gouge 46: Stopper 47: Connecting groove 48: Connecting piece 50: Joint base 55: Adhesive 60: Filler plate 61: Through hole 70: Gap for construction adjustment (gap) 81, 82, 83, 84: Fastener 100: Wooden steel fireproof column

Claims

1. A steel-wood fire-resistant column comprising a steel column and a wooden char layer disposed around the steel column, wherein: the steel column has a rectangular or substantially rectangular cross-sectional shape; a steel base is fixed to each side surface of the steel column; a non-combustible plate forming a fire-stopping layer and a wooden plate forming the char layer, which are fixed to the steel base by fasteners; a construction adjustment gap is provided between the non-combustible plate and the wooden plate, and a filler plate having a thickness corresponding to the gap is interposed in the gap. The steel-wood fire-resistant column is characterized by this.

2. A joint base is disposed outside the filler plate, and the wooden plate is disposed outside the joint base, the joint base is fixed to the steel base together with the filler plate and the non-combustible plate by the fasteners, and the wooden plate is fixed to the joint base. The steel-wood fire-resistant column according to claim 1 is characterized by this.

3. A wooden connecting piece is fitted into a connecting groove straddling the ends of two adjacent wooden plates, and the ends of the wooden plates are connected to each other. The steel-wood fire-resistant column according to claim 1 or 2 is characterized by this.

4. There are respective unique gaps outside the four side surfaces of the steel column, and filler plates having thicknesses corresponding to the respective gaps are disposed. The steel-wood fire-resistant column according to claim 1 or 2 is characterized by this.

5. A construction method of a steel-wood fire-resistant column comprising a steel column and a wooden char layer disposed around the steel column, wherein: Step A: Erect the steel column, which has a rectangular or substantially rectangular cross-sectional shape and has a steel base fixed to each side surface; Step B: Fix a non-combustible plate forming a fire-stopping layer to the steel base by a fastener and measure the position of the surface of the non-combustible plate; Step C: Fix a filler plate having a thickness corresponding to the construction adjustment gap left as a result of the measurement in Step B to the steel base by a fastener with respect to a preset gap between the fire-stopping layer and the char layer, and fix a wooden plate forming the char layer to the steel base directly or indirectly by a fastener so as to sandwich the filler plate. The construction method of the steel-wood fire-resistant column is characterized by having these steps.

6. A joint base is disposed outside the filler plate, and the wooden plate is disposed outside the joint base. In the C step, The method for constructing a wooden-steel fire-resistant column according to claim 5, characterized in that the filler plate and the joint base are fixed to the steel base by fasteners, and the wooden plate is fixed to the joint base by fasteners.

7. In the B step, the positions of the surfaces of the non-combustible plates on the outer sides of the four side surfaces of the steel column are measured. The method for constructing a wooden-steel fire-resistant column according to claim 5 or 6, characterized in that in the C step, a filler plate having a thickness corresponding to each construction adjustment gap left as a result of the measurement in the B step is fixed to the corresponding steel base by fasteners.

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