JP2018009387A - Fire-resistant woody member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fire-resistant woody member capable of achieving the slimming-down of a cross-section of the member.SOLUTION: In a woody member 100 with fire resistance, a cross-sectional shape of a core material 10 made of a woody material for bearing a load is a polygonal shape having at least five angles, and angular degrees θ of all cross-sectional angular parts 16 of the polygonal shape are set to be obtuse angles.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a fire-resistant wooden member suitable for use as a building structural member such as a pillar.

  Generally, since the cross-sectional shape of the conventional fire-resistant wood member is rectangular, the thermal influence when the right-angled corner is heated becomes the largest. Therefore, in the conventional fire-resistant woody member, various devices have been applied in order to ensure the fire-resistant performance at the corners (see, for example, Patent Documents 1 to 4).

  FIGS. 5 (1) to (3) show cross-sectional examples of conventional fire-resistant wood members. The structure of FIG. 5 (1) is shown in the above-mentioned patent document 1, and includes a load supporting portion 1 made of wood, an outer peripheral portion 2 exposed to the outside outside the load supporting portion 1, and a load. The reinforcing member 3 is provided at a corner portion outside the support portion 1 at a position where it is not exposed to the outside. The reinforcing member 3 is composed of a member having a higher density after carbonization than the member of the outer peripheral portion 2. Further, the structure of FIG. 5 (2) is provided with a load support portion 1, a mortar portion 4, a burning stop layer 5 and a burning allowance layer 6. 5 (3) corresponds to the above-mentioned Patent Document 3, and includes a load support portion 1, a second dead end layer 7, and a first dead end layer 8.

JP 2012-136939 A Japanese Patent No. 4871660 JP2015-129431A Japanese Patent Laying-Open No. 2015-061969

  However, in the above conventional structure, in order to enhance the fire resistance performance of the corner, a material having high fire resistance is used for the part, or the entire member is covered with the thickness of the fireproof coating necessary for the corner. The covering layer (the part indicated by reference numeral 9 in FIG. 5) was thickened. For this reason, there has been a problem that the manufacturing method of the refractory wood member becomes complicated and the coating layer becomes thick, resulting in an increase in cost and an increase in member cross section.

  For this reason, there has been a demand for the development of a fire-resistant woody member that can achieve a slimmer member cross-section while having the same structural performance as that of the prior art.

  This invention is made | formed in view of the above, Comprising: It aims at providing the fire-resistant woody member which can aim at slimming of a member cross section.

  In order to solve the above-described problems and achieve the object, the fire-resistant wood member according to the present invention is a wood member having fire resistance, and the cross-sectional shape of the core material made of the wood material supporting the load is at least a pentagon. It is the above polygonal shape, The angle of all the cross-sectional corner | angular parts of this polygonal shape is an obtuse angle, It is characterized by the above-mentioned.

  In addition, another fire-resistant wood member according to the present invention is characterized in that in the above-described invention, it further includes a flame stop layer or a finishing material provided outside the core material.

  In addition, the other fire-resistant wood member according to the present invention is characterized in that, in the above-described invention, a fire stop layer provided outside the core material and a finishing material provided outside the fire stop layer are further provided.

  In addition, in the above-described invention, the other fire-resistant wood member according to the present invention has a circular cross-sectional shape, an elliptical shape, an oval shape as a whole including the flame stop layer provided on the outer side of the core material or the core material of the finishing material. It is a polygonal shape similar to the shape, egg shape or cross-sectional shape of the core material.

  Another fire-resistant wood member according to the present invention is a wood member having fire resistance, wherein the cross-sectional shape of a core material made of a wood material that supports a load is circular.

  According to the fire-resistant wood member according to the present invention, it is a wood member having fire resistance, and the cross-sectional shape of the core material made of the wood material supporting the load is a polygonal shape of at least a pentagon, and all of this polygonal shape The angle of the cross section of the core is obtuse, so the angle of the cross section of the core material, which is a weak point in securing fire resistance, is gentle compared to the case of the conventional rectangle (the angle of the cross section is a right angle) For this reason, it is difficult to be affected by double-sided heating. For this reason, according to this invention, the fire resistance performance of a corner | angular part can be improved significantly rather than the case where the cross-sectional shape of a core material is a rectangle. Therefore, even if the member is thinned, the structural performance equivalent to or higher than that of the conventional structure can be ensured, and it is possible to reduce the cross section of the member and reduce the cost. Moreover, by using this refractory wood member for an indoor pillar or the like, the openness of the indoor space is enhanced, and the room can be effectively utilized.

  Further, according to another fireproof wood member according to the present invention, since it further includes a flame stop layer or a finishing material provided on the outer side of the core material, the flame stop layer suppresses transfer of heat to the core material due to a fire. The core material can be prevented from being carbonized and burned. In addition, the finish material has an effect that wood texture can be imparted to the outside of the core material.

  Further, according to another fire-resistant wood member according to the present invention, it further includes a flame stop layer provided on the outer side of the core material and a finishing material provided on the outer side of the flame stop layer. The effect of suppressing heat transfer to the core material, preventing carbonization and combustion of the core material, and providing a wood texture to the outside of the core material by the finishing material is achieved.

  Further, according to another fire-resistant wood member according to the present invention, the entire cross-sectional shape including the flame stop layer provided on the outer side of the core material or the core material of the finishing material is circular, elliptical, oval, egg Since it is a polygonal shape similar to the shape or cross-sectional shape of the core material, the fire resistance performance of the corners can be remarkably improved and the degree of freedom in design can be improved as compared with the case where the cross-sectional shape of the core material is rectangular. There is an effect.

  Further, according to another fire-resistant wood member according to the present invention, the cross-sectional shape of the core material is a wood member having fire resistance, and the cross-sectional shape of the core material made of the wood material supporting the load is circular. The fire resistance can be remarkably improved as compared with the case of the rectangular shape. Therefore, even if the member is thinned, the structural performance equivalent to or higher than that of the conventional structure can be ensured, and it is possible to reduce the cross section of the member and reduce the cost. Moreover, by using this refractory wood member for an indoor pillar or the like, the openness of the indoor space is enhanced, and the room can be effectively utilized.

FIG. 1 is a cross-sectional view showing a first embodiment of a fire-resistant wood member according to the present invention. FIG. 2 is a cross-sectional view showing a second embodiment of the refractory wood member according to the present invention. FIG. 3 is a cross-sectional view showing Embodiment 3 of the refractory wood member according to the present invention. FIG. 4 is a diagram showing the results of analysis performed to verify the operational effects of the present invention. FIG. 5 is a cross-sectional view showing an example of a conventional fire-resistant wood member.

  Embodiments of a fire-resistant wood member according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
First, the first embodiment of the present invention will be described.
As shown in FIG. 1, the refractory wood member 100 according to the first embodiment includes a core material 10, a flame stop layer 12 provided outside the core material 10, and a finishing material provided outside the flame stop layer 12. 14.

  In the present embodiment, the cross-sectional shape of the core member 10 is a regular octagonal shape (polygonal shape of pentagon or more), and the internal angle θ (angle) of each cross-sectional corner portion 16 is 135 ° (obtuse angle). Moreover, the cross-sectional shape including the core material 10 and the flame stop layer 12 is also a concentric regular octagonal shape, and the cross-sectional shape of the entire refractory wood member 100 including the finishing material 14 is also a regular octagonal shape. .

  Thus, in this Embodiment, in order to reduce the thermal influence in the cross-sectional corner | angular part 16 of the refractory wood member 100, the cross-sectional shape of the core material 10 is made octagonal. In addition, the cross-sectional shape of the core material 10 is not limited to an octagonal shape, but may be a polygonal shape or a circular shape other than the pentagonal shape, but an octagonal shape is preferable because it is easy to manufacture. Here, the polygonal shape of the pentagon or more means a polygonal shape of a pentagon or more in which the internal angles θ of the corners of the polygon are all obtuse, for example, a pentagon shape, a hexagon shape, a heptagon shape, an octagon shape, a nine-sided shape. N-corner shape such as decagonal shape (where N is an integer greater than or equal to 5), regular pentagonal shape, regular hexagonal shape, regular heptagonal shape, regular octagonal shape, regular octagonal shape, A regular N-angular shape such as a regular decagonal shape can be exemplified.

  When the cross-sectional shape of the core member 10 is an octagonal shape as in the present embodiment, it is easy to manufacture because it can be manufactured by cutting one corner of a member having a rectangular cross section and assembling four of the members. Further, the cross-sectional shape including the core material 10 and the flame stop layer 12 and the overall cross-sectional shape including the finishing material 14 are not limited to the octagonal shape, but other polygonal shapes, circular shapes, elliptical shapes, and oval shapes. It may be a shape or an egg shape. When the overall cross-sectional shape is an ellipse shape, an oval shape, or an egg shape, the cross-sectional shape of the core member 10 may be formed so that a pair of opposing sides have a long polygonal shape. Further, it is desirable to apply a special fireproof measure or a covering material to the cross-sectional corner portion 16 so that the entire cross-section is not thickened.

  The core material 10 is made of a laminated material (woody material) that supports a load. As the core material 10, it can comprise using the general laminated material which consists of a cedar, a larch etc., for example. Although the thickness (distance between opposite sides) of the core material 10 can be appropriately adjusted according to the application, it can be set to, for example, about 450 mm.

  The flame stop layer 12 is a coating layer having fire resistance, for example, an inorganic material having endothermic properties and heat insulation properties, a non-combustible material that does not easily burn, or foams when heated and remarkably increases its thickness. It can comprise with materials, such as a fireproof sheet and a fireproof film which express. This fire-stop layer 12 has a function of preventing heat from being transferred to the adjacent inner core material 10 in the event of a fire, preventing the core material 10 from being carbonized or burning, and suppressing heat conduction to the core material 10. Demonstrate the effect. When the flame stop layer 12 is made of an inorganic material, for example, a board-like material such as a reinforced gypsum board, a gypsum board, or a calcium board (calcium silicate board) can be used. Moreover, the thickness can be suitably adjusted according to a use. When the thickness is increased, the effect of suppressing heat conduction is improved. These boards may be stacked to a predetermined thickness. Here, materials such as reinforced gypsum board, gypsum board, and calcium silicate board (calcium silicate board) are suitable for the burn-out layer 12 because they are available at a very low price and have high heat insulation and heat absorption. . Further, when the flame-stopping layer 12 is made of a non-combustible material, for example, non-combustible wood obtained by impregnating wood with a chemical such as boric acid to be incombustible can be used. Although the thickness of the flame stop layer 12 can be suitably adjusted according to a use, it is preferable to set it as about 15 mm-45 mm, for example, and it is more preferable to set it as about 30 mm. Further, when the flame-stopping layer 12 is made of a material such as the above-mentioned fireproof sheet or fireproof film, the thickness can be appropriately adjusted according to the application, but it is preferably about 1 mm to 12 mm, for example. More preferably, it is about 1.5 mm to 6 mm.

  The finishing material 14 is made of wood and is provided in order to give a wood texture to the outside of the flame stop layer 12. Therefore, the outer surface of the refractory wood member 100 has a wood texture or wood grain appearance due to the finishing material 14. The finishing material 14 is preferably a woody material such as wood or a decorative laminated material for cost saving, but a building finishing material such as a cloth material may be used. The thickness of the finishing material 14 is preferably about 3 mm to 30 mm, for example, but of course, it may be made thinner so that it hardly functions as a burning allowance.

  According to the fire-resistant wood member 100 configured as described above, the internal angles θ of the cross-sectional corner portions 16 of the core material 10 which are weak points in securing fire resistance are all obtuse angles, and the conventional rectangular shape (the internal angle of the cross-sectional corner portion). Is less than the case of right angle), and is less susceptible to the effects of two-sided heating. For this reason, according to this Embodiment, the fire resistance performance of a corner | angular part can be improved significantly rather than the case where the cross-sectional shape of the core material 10 is a rectangle. Therefore, even if the member is thinned, the structural performance equivalent to or higher than that of the conventional structure can be ensured, and the member cross section can be slimmed and the cost can be reduced. Further, by using this fireproof wood member 100 for an indoor pillar or the like, the openness of the indoor space is enhanced, and the room can be effectively utilized.

  Moreover, the cross-sectional shape of the whole refractory wood member 100 including the core material 10 of the finishing material 14 is a circular shape or a polygonal shape of a pentagon or more similar to the cross-sectional shape of the core material 10. The fire resistance of the cross section 16 can be remarkably improved as compared with the rectangular shape, and the degree of freedom in design can be improved.

(Embodiment 2)
Next, a second embodiment of the present invention will be described.
As shown in FIG. 2, the fireproof wood member 200 according to the second embodiment includes a core material 10, a second dead end layer 12 </ b> B provided outside the core member 10, and an outer side of the second dead end layer 12 </ b> B. 12 A of 1st flame stop layers provided and the finishing material 14 provided in the outer side of 12 A of 1st flame stop layers are provided.

  Also in the present embodiment, the cross-sectional shape of the core material 10 is a regular octagonal shape as in the first embodiment, and the internal angle θ (angle) of the cross-sectional corner portion 16 is 135 ° (obtuse angle). Further, the cross-sectional shape including the core material 10, the second dead end layer 12B, and the first dead end layer 12A is also a concentric regular octagonal shape, and the cross sectional shape of the entire refractory wood member 200 including the finishing material 14 is also regular octagonal. It has a shape.

  Since the core material 10 and the finishing material 14 are the same as those described in the first embodiment, detailed description thereof will be omitted. In addition, the first flame stop layer 12A and the second flame stop layer 12B correspond to the flame stop layer 12 described in the first embodiment.

  Here, 12 A of 1st flame stop layers and the 2nd flame stop layer 12B are each comprised as a flat layer of the same width, and the 2 adjacent sides of the 1st flame stop layer 12A and the 2nd flame stop layer 12B are They are joined with an adhesive via compressed wood 18 (biscuits) provided at the corner 16 of the cross section. In addition to such a configuration, a configuration in which a tucker nail is driven into the core material 10 from the finishing material 14 may be employed.

  The second dead end layer 12B can be configured using an inorganic material having endothermic properties and heat insulation properties. In the event of a fire, the second flame stop layer 12B prevents heat transfer to the adjacent inner core member 10 even after the outer first flame stop layer 12A has lost its function due to a fire. In addition, the core material 10 has a function of not carbonizing or burning, and exhibits an effect of suppressing heat conduction to the core material 10. As the inorganic material forming the second dead end layer 12B, a board-like material such as a reinforced gypsum board, a gypsum board, or a calcium plate (calcium silicate plate) can be used. Moreover, the thickness can be suitably adjusted according to a use. When the thickness is increased, the effect of suppressing heat conduction is improved. These boards may be stacked to a predetermined thickness. Here, materials such as reinforced gypsum board, gypsum board and calcium silicate board (calcium silicate board) can be obtained at a very low price and have high heat insulating properties and heat absorption properties, and thus are suitable as the second burn-out layer 12B. It is.

  12 A of 1st flame stop layers are the coating layers which have fire resistance, and are provided in the outer side of the 2nd flame stop layer 12B. In the event of a fire, the first flame stop layer 12A has a function of delaying the progress of combustion to the adjacent second flame stop layer 12B due to its heat insulating property, and conducts heat to the second flame stop layer 12B. Demonstrate the effect. As this 1st flame stop layer 12A, the nonflammable material which is hard to burn, for example, the nonflammable wood which impregnated the chemical | medical agents, such as a boric acid, with the wood, can be used. Moreover, although the thickness of 12 A of 1st flame stop layers can be suitably adjusted according to a use, it is preferable to set it as about 15 mm-45 mm, for example, and it is more preferable to set it as about 30 mm.

  According to the fireproof wood member 200 configured as described above, the internal angle θ of the cross-sectional corner portion 16 of the core member 10 which is a weak point in securing fireproof performance is the same as that of the conventional rectangular as in the first embodiment. Compared to the case, it is gentler and less susceptible to two-sided heating, so that the fire resistance performance of the corners can be remarkably improved as compared with the case where the cross-sectional shape of the core 10 is rectangular. Therefore, even if the member is thinned, the structural performance equivalent to or higher than that of the conventional structure can be ensured, and the member cross section can be slimmed and the cost can be reduced.

  In the present embodiment, the case where the second dead end layer 12B is made of an inorganic material having endothermic properties and heat insulation and the first dead end layer 12A is made of a nonflammable material has been described as an example. The composition of the material may be reversed. Further, either one of the second flame stop layer 12B and the first flame stop layer 12A is formed using a material such as a fire-resistant sheet or a fire-resistant film that foams when heated and remarkably increases its thickness and exhibits heat insulation properties. May be.

  Moreover, in this Embodiment, although the flame stop layer demonstrated the case where it comprised by two layers of 12 A of 1st flame stop layers and the 2nd flame stop layer 12B from which an effect | action and a function differ, this invention is limited to this. It is not a thing, The structure of the flame stop layer of 3 or more layers from which an effect | action and a function differ may be sufficient. Even if it does in this way, it is possible to show the effect similar to the above.

(Embodiment 3)
Next, a third embodiment of the present invention will be described.
As shown in FIG. 3, the fireproof wood member 300 according to the third embodiment includes a core material 10, a second dead end layer 12 </ b> B provided on the outer side of the core member 10, and an outer side of the second dead end layer 12 </ b> B. 12 A of 1st flame stop layers provided and the finishing material 14 provided in the outer side of 12 A of 1st flame stop layers are provided.

  Also in the present embodiment, the cross-sectional shape of the core material 10 is a regular octagonal shape as in the first embodiment, and the internal angle θ (angle) of each cross-sectional corner portion 16 is 135 ° (obtuse angle). is there. Further, the cross-sectional shape including the core material 10, the second dead end layer 12B, and the first dead end layer 12A is also a concentric regular octagon. However, the cross-sectional shape of the entire refractory wood member 300 including the finishing material 14 is a concentric circular shape, which is different from the first and second embodiments. According to the present embodiment, the cross-sectional shape of the entire refractory wood member 300 can be made circular, and variations in member design are widened. The cross-sectional shape of the entire refractory wood member 300 is not limited to a circular shape, and may be an elliptical shape, an oval shape, or an egg shape.

  Moreover, in this Embodiment, the recessed part 20 is provided in a part of surface of the finishing material 14, the screw 24 is driven toward the core material 10 from this recessed part 20, and the buried tree 22 is embedded in the recessed part 20 from the top. The structure which coat | covered the head of the screw | thread 24 is employ | adopted. Further, tapered portions are provided at the end portions of the second dead end layer 12B and the first dead end layer 12A, and they are joined to each other through the tapered portion. In the case where the cross-sectional shape is a regular polygon, there is an advantage that manufacturing is simplified if the second flame stop layer 12B and the first flame stop layer 12A have the same shape and dimensions.

  Here, the joint depth between the adjacent second flame stop layer 12B and the first flame stop layer 12A is larger than that in a normal case (joint in a direction perpendicular to the outer surface of the core material 10) by joining the tapered portions. A deep oblique joint (an oblique joint that is not orthogonal to the outer surface of the core member 10) is formed. In general, the heat insulation performance of the joint becomes larger as the joint depth is deeper because the heat penetration distance through the joint becomes longer. For this reason, the joint structure as shown in FIG. 3 has an advantage that the effect of delaying the temperature rise of the inner core member 10 through the joint is enhanced.

  Since the core material 10, the 1st flame stop layer 12A, the 2nd flame stop layer 12B, and the finishing material 14 are the same as that of said Embodiment 1, 2, detailed description of these is abbreviate | omitted.

  According to the fire-resistant wood member 300 configured as described above, as in the first and second embodiments, the internal angle θ of the cross-sectional corner portion 16 of the core material 10 which is a weak point in securing fire resistance is the conventional one. Since it is gentler and less susceptible to two-sided heating than the rectangular case, the fire resistance performance of the corners can be significantly improved as compared with the rectangular cross-sectional shape of the core material 10. Therefore, even if the member is thinned, the structural performance equivalent to or higher than that of the conventional structure can be ensured, and the member cross section can be slimmed and the cost can be reduced.

(Modification)
In the above-described first to third embodiments, the case where the cross-sectional shape of the core material 10 is a polygonal shape (regular octagonal shape) has been described as an example, but the present invention is not limited to this and is circular. Also good. If the cross-sectional shape of the core material 10 is circular, there is no cross-sectional corner 16 of the core material 10 which is a weak point in securing the fire resistance performance. This can be further improved. As a result, it is possible to achieve the same or more operational effects as those of the first to third embodiments.

  In this case, as in the first to third embodiments, a flame stop layer and a finishing material may be further provided outside the core material 10, and the cross-sectional shape of the entire refractory wood member including the core material 10 is circular. It may be oval, oval, egg or polygonal. By doing so, the degree of freedom in design can be improved.

(Verification of effects of the present invention)
Next, verification of the operational effects of the present invention will be described.
The present inventor conducted a two-dimensional heat conduction analysis by a finite element method, and investigated the effects of the present invention. The analysis cases include a total of four cases when the cross-sectional shape of the core is a regular square (corresponding to a comparative example), a regular hexagon, a regular octagon, and a regular decagon (corresponding to the embodiment of the present invention). did. In each case, the coating layer thickness on the surface of the core material was set to 30 mm, the coating layer and the core material were assumed to have no moisture, and the coating layer and the core material were analyzed not to burn. The heating temperature was given according to the standard heating temperature curve of ISO834. Moreover, about mesh division, all were triangular meshes and the minimum dimension was about 1 mm (side).

  FIG. 4 shows the change with time of the surface temperature of the corner portion (cross-section corner portion) of the core material obtained by this analysis. As shown in this figure, it can be seen that, regardless of the heating time, the corner surface temperatures of regular hexagons, regular octagons, and regular decagons corresponding to this example are lower than those of regular tetragons. For example, at a heating time of 60 minutes, the corner surface temperature in the case of a regular square is about 650 ° C., whereas in the case of a regular hexagon, regular octagon, and regular decagon, it is about 580 ° C., 580 ° C., and 560 ° C., respectively. In both cases, there is a gap from the case of a regular square, and it is as low as that. This is because, in the case of regular hexagon, regular octagon, and regular decagon, the corners are obtuse (120 °, 135 °, 144 °, respectively) and are gentler than in the case of regular tetragon (90 °). It is considered that the corner surface temperature is lower than that of a regular tetragon as a result of being hardly affected by the two-surface heating and suppressing the temperature rise. For this reason, according to this invention, the fireproof performance of a corner | angular part can be improved significantly rather than the case where the cross-sectional shape of a core material is a regular square. In this verification, regular hexagons, regular octagons, and regular decagons have been described as examples, but the same applies to other regular polygons (for example, regular pentagons, regular heptagons, regular pentagons, regular dodecagons, etc.). It is thought that it becomes the result of.

  As described above, according to the fire-resistant wood member according to the present invention, the cross-sectional shape of the fire-resistant wood member made of a wood material that supports a load is a polygonal shape having at least a pentagon or more. Since the angles of all the cross-section corners of this polygonal shape are obtuse, the angle of the cross-section corner of the core material, which is a weak point in securing fire resistance, is a conventional rectangle (the angle of the cross-section corner is a right angle). Since it is gentler than the case, it is difficult to be affected by two-sided heating. For this reason, according to this invention, the fire resistance performance of a corner | angular part can be improved significantly rather than the case where the cross-sectional shape of a core material is a rectangle. Therefore, even if the member is thinned, the structural performance equivalent to or higher than that of the conventional structure can be ensured, and the member cross section can be slimmed and the cost can be reduced. Moreover, by using this refractory wood member for an indoor pillar or the like, the openness of the indoor space is enhanced, and the room can be effectively utilized.

  Further, according to another fireproof wood member according to the present invention, since it further includes a flame stop layer or a finishing material provided on the outer side of the core material, the flame stop layer suppresses transfer of heat to the core material due to a fire. The core material can be prevented from being carbonized and burned. Moreover, a wood texture can be given to the outer side of a core material with a finishing material.

  Further, according to another fire-resistant wood member according to the present invention, it further includes a flame stop layer provided on the outer side of the core material and a finishing material provided on the outer side of the flame stop layer. Heat transmission to the core material can be suppressed, carbonization and combustion of the core material can be prevented, and a wood texture can be imparted to the outside of the core material by the finishing material.

  Further, according to another fire-resistant wood member according to the present invention, the entire cross-sectional shape including the flame stop layer provided on the outer side of the core material or the core material of the finishing material is circular, elliptical, oval, egg Since it is a polygonal shape similar to the shape or cross-sectional shape of the core material, the fire resistance performance of the corners can be remarkably improved and the degree of freedom in design can be improved as compared with the case where the cross-sectional shape of the core material is rectangular. .

  Further, according to another fire-resistant wood member according to the present invention, the cross-sectional shape of the core material is a wood member having fire resistance, and the cross-sectional shape of the core material made of the wood material supporting the load is circular. The fire resistance can be remarkably improved as compared with the case of the rectangular shape. Therefore, even if the member is thinned, the structural performance equivalent to or higher than that of the conventional structure can be ensured, and the member cross section can be slimmed and the cost can be reduced. Moreover, by using this refractory wood member for an indoor pillar or the like, the openness of the indoor space is enhanced, and the room can be effectively utilized.

  As described above, the refractory wood member according to the present invention is useful for use as a building structural member, and is particularly suitable for slimming the member cross section and, hence, cost reduction.

DESCRIPTION OF SYMBOLS 10 Core material 12 Burn-out layer 12A 1st burn-out layer 12B 2nd burn-out layer 14 Finishing material 16 Cross section corner 18 Compressed wood 20 Recess 22 Burried wood 24 Screw θ Interior angle (angle)
100, 200, 300 refractory wood

Claims (5)

A wood member having fire resistance,
A fireproof wooden member characterized in that the cross-sectional shape of a core material made of a wooden material that supports a load is a polygonal shape of at least a pentagon, and the angles of all cross-sectional corners of the polygonal shape are obtuse.   The refractory wood member according to claim 1, further comprising a burn-out layer or a finish provided on the outside of the core material.   The fire-resistant woody member according to claim 1, further comprising a flame stop layer provided on the outer side of the core material and a finishing material provided on the outer side of the flame stop layer.   The overall cross-sectional shape including the flame stop layer provided on the outside of the core material or the core material of the finishing material is a circular shape, an elliptical shape, an oval shape, an egg shape, or a polygonal shape similar to the cross-sectional shape of the core material. The refractory wood member according to any one of claims 1 to 3. A wood member having fire resistance,
A fire-resistant wooden member characterized in that a cross-sectional shape of a core material made of a wooden material that supports a load is circular.

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