JP2020023853A - Fireproof wooden structural material - Google Patents

Abstract

To provide a fireproof wooden structural material exhibiting first burning stop property, being excellent in fireproof property and being easily manufactured.SOLUTION: A fireproof wooden structural material 1 includes a load support portion 11, in which, on four side faces along an axial direction, burning margin layers 12 are formed. The fireproof wooden structural material 1 includes first lamina lamination portions 13 and 13 whose lamina lamination direction is a direction X perpendicular to one direction Y of a cross section of the fireproof wooden structural material 1 at both sides of the load support portion 11 in the one direction Y and second lamina lamination portions 14 and 14 whose lamina lamination direction is the perpendicular direction X at both sides of the load support portion 11 in the perpendicular direction X. In the first and second lamina lamination portions 13 and 14, a lamina 4 is a lamina 40 with a discontinuous annual ring not including an early wood portion 42 continuing across both ends of the lamina 4 in the perpendicular direction X in the cross section of the fireproof wooden structural material 1. The burning margin layers 12 are formed of the first and second lamina lamination portions 13 and 14.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a refractory wooden structure.

  When wood is heated from the outside during a fire, the surface burns and a carbonized layer is formed. When the carbonized layer is uniformly formed on the surface of the wood, the penetration of heat into the wood is suppressed, and the structural deterioration inside the wood is suppressed. There is known a technique that utilizes this characteristic to provide a predetermined thickness of burnout on the surface of wood so that a healthy cross section capable of supporting a long-term load is secured inside the wood after burning. A wooden building is also used as a semi-fireproof building by using a structural material or the like provided with such an ember for a main structural part.

  Various techniques have been proposed for obtaining a fire-resistant member by providing an emissive surface on the surface of wood or a composite material of wood and other materials. For example, Patent Literature 1 discloses that, outside a load supporting layer made of wood or the like sufficient to support a long-term load, an incombustible layer having a heat insulating material as a non-combustible material and constituting a heat insulating layer is further provided. In addition, a structural material provided with an ember layer made of wood having a predetermined ember thickness has been proposed. Patent Document 2 discloses a fire-resistant laminated wood having a flame-retardant-agent-injection layer made of wood into which a flame-retardant has been injected on the outside of an untreated layer, and having a surface layer containing no flame-retardant on its outside. Proposed.

JP 2005-36457 A JP 2008-31743 A

In the structural material of Patent Literature 1, a burn-off layer is disposed outside the load support layer, and a burn-out layer is disposed outside the fire-stopping layer. The unburned layer has a non-combustible material and a heat insulating material having heat insulating properties. In the refractory laminate of Patent Document 2, the untreated layer is covered with a flame-retardant chemical injection layer, and the flame-retardant chemical injection layer is further coated with a surface layer.
Since the structural material of Patent Document 1 and the refractory laminated material of Patent Document 2 each have a three-layer structure, there is a problem that the manufacturing cost is increased. In addition, since the manufacture of the heat-insulating material which is the non-combustible material constituting the burn-out layer and the wood injected with the flame retardant constituting the flame-retardant chemical injection layer is complicated, the production process becomes long and complicated as a result. There is a problem.

  An object of the present invention is to provide a fire-resistant wooden structural material which is excellent in fire resistance performance and easy to manufacture.

  The present invention is a fire-resistant wooden structural material, which is a square lumber, has a load supporting portion, and has an ember layer formed along at least three of the four side surfaces extending in the axial direction. On both sides of the load supporting portion in one direction of the cross section of the fire-resistant wooden structural material, a first lamina laminated portion having a direction perpendicular to the one direction as a laminating direction of lamina is provided, and in a direction perpendicular to the one direction. One or both sides of the load supporting portion has a second lamina laminated portion having the one direction or a direction orthogonal to the one direction as a laminating direction, and a first lamina laminated portion and a second lamina laminated portion. Is a non-continuous annual ring in which the laminas constituting each have, in a cross section of the fire-resistant wooden structural material, no early wood portion of an annual ring continuous between both ends of the lamina in a direction orthogonal to the laminating direction of the lamina. Lamina, the first The above object has been attained by providing a fire-resistant wooden structural material in which an ember layer is formed along the three side surfaces or the four side surfaces of the fire-resistant wooden structural material by the mina laminated portion and the second lamina laminated portion. Things.

  Further, the present invention is a square lumber, having a core made of wood at the center of the cross section, and surrounding three or four sides of the core surrounded by a lamina laminate having a structure in which a plurality of laminas are laminated. A fire-resistant wooden structural material, comprising, on both sides of the core in one direction of a cross section of the fire-resistant wooden structural material, a first lamina laminated portion having a direction orthogonal to the one direction as a laminating direction. Has, on one or both sides of the core portion in a direction orthogonal to the one direction, a second laminating portion having a laminating direction in the one direction or a direction orthogonal to the one direction, The first lamina laminated portion and the second lamina laminated portion are formed such that laminas constituting each are continuous in a cross section of the refractory wooden structural member between both ends of the lamina in a direction orthogonal to the laminating direction of the lamina. Annual rings without the early part A lamina, the thickness of the lamina stack surrounding the three sides or four sides of the periphery of the core portion is at least 50mm, by providing a refractory wood structural member is obtained by achieving the above object.

  The fire-resistant wooden structural material of the present invention has excellent fire resistance and is easy to manufacture.

FIG. 1A is a cross-sectional view showing a fire-resistant wooden structural material according to a first embodiment of the present invention, and FIG. 1B is an explanatory diagram of a configuration of the fire-resistant wooden structural material. FIG. 2A is a cross-sectional view (corresponding to FIG. 1) showing a fire-resistant wooden structural material according to a second embodiment of the present invention, and FIG. 2B is an explanatory diagram of the structure of the fire-resistant wooden structural material. It is. FIG. 3A is a cross-sectional view showing an example of a state of formation of annual rings of raw wood, and FIGS. 3B to 3E are cross-sectional views showing states of annual rings appearing in a cross section of lamina. It is. FIG. 4 is a cross-sectional view showing a fire-resistant wooden structural member according to still another embodiment of the present invention, and is a view corresponding to FIG. FIG. 5 is a cross-sectional view showing a fire-resistant wooden structural member according to still another embodiment of the present invention, and is a view corresponding to FIG. FIG. 6 is a cross-sectional view showing a fire-resistant wooden structural member according to still another embodiment of the present invention, and is equivalent to FIG. FIG. 7 is a cross-sectional view showing a fire-resistant wooden structural material according to still another embodiment of the present invention, and is equivalent to FIG. FIG. 8 is a cross-sectional view showing a fire-resistant wooden structural member according to still another embodiment of the present invention, and is equivalent to FIG. FIG. 9 is a cross-sectional view showing a fire-resistant wooden structural member according to still another embodiment of the present invention, and is equivalent to FIG.

Hereinafter, the fire-resistant wooden structural material of the present invention will be described in detail based on preferred embodiments.
The fire-resistant wooden structural member 1 according to the first embodiment of the present invention is a square member used as a column member of a wooden building, and has an axial direction set as a vertical direction. As shown in FIG. 1A, the refractory wooden structural material 1 has a quadrangular cross-sectional shape orthogonal to the axial direction, and has four side surfaces a to d extending along the axial direction.
The fire-resistant wooden structural member 1A according to the second embodiment of the present invention is a timber used as a beam for a wooden building, and has an axial direction as a horizontal direction. As shown in FIG. 2A, the refractory wooden structure 1A has a quadrangular cross-sectional shape perpendicular to the axial direction, and has four side surfaces a1 to d1 extending along the axial direction. When used, the fire-resistant wooden structural material 1A is disposed between the four side surfaces a1 to d1 between the upper surface and the lower surface, that is, the side surface a1 serving as the upper surface disposed vertically above, the lower surface c1 serving as the lower surface disposed below. And two side surfaces b1 and d1.

  The fire-resistant wooden structural materials 1 and 1A according to the first and second embodiments will be described in more detail. The fire-resistant wooden structural materials 1 and 1A have a core 2 that functions as a load supporting portion 11, and are made of a fire-resistant wooden structural material. A combustible layer 12 is formed along at least three of the four side surfaces extending along the axial direction of 1, 1A. More specifically, in the fire-resistant wooden structural member 1 of the first embodiment, the burn-out layer 12 is formed along four side surfaces a to d of the four side surfaces a to d extending along the axial direction, In the fire-resistant wooden structural member 1A of the second embodiment, an ember layer 12 is formed along three side surfaces b1 to d1 of the four side surfaces a1 to d1 extending along the axial direction. The core 2 is made of wood, and is located at the center of the cross section of the refractory wooden structural material 1, 1A. The core portion 2 may be present from the center of the cross section to the side surface a1 where the ember layer 12 is not formed, as in the fire-resistant wooden structural material 1A.

  As shown in FIGS. 1 (a) and 2 (a), the fire-resistant wooden structural members 1 and 1A of the first and second embodiments have a load support portion 11 (or a core portion 2) in one direction Y of a cross section. Has a first lamina laminated portion 13 having a direction X orthogonal to the one direction Y as a laminating direction of the lamina 4, and a load supporting portion 11 (or a core portion 2) in the direction X orthogonal to the one direction Y. ), On one or both sides, a second laminating section 14 having the one direction Y as the laminating direction of the lamina 4 is provided. In addition, the first lamina laminated portion 13 and the second lamina laminated portion 14 are configured such that the lamina 4 constituting each of both ends of the lamina 4 in a direction perpendicular to the laminating direction of the lamina 4 in the cross section of the fire-resistant wooden structural material 1, 1A. An annual ring discontinuous lamina 40 having no early wood portion 42 of an annual ring 41 continuous therebetween.

  The load supporting portion 11 in the first and second embodiments is designed to have a sectional design so that it is safe in terms of structural strength against a long-term load (long-term load) such as a fixed load or a load. . Such cross-sectional designs are known. The cross-sectional shape of the load supporting portion 11 is a square shape, and the length of the load supporting portion 11 in one direction Y and the length of the direction X orthogonal to the one direction Y in the cross section of the refractory wooden structural material 1, 1A. Can be changed as appropriate according to the shape or size of the columns and beams. The load supporting portion 11 shown in FIG. 1 and FIG. 2 has a laminar laminate in which a plurality of laminas 4 are laminated and adhered in a direction X orthogonal to the one direction Y and arranged in one direction Y to form a rectangular cross section. I have.

  The thicknesses La to Ld of the ember layer 12 in the first and second embodiments can be set based on a known ember design. Burnout design is a design method that adds a certain amount of burnout to the cross-section required for long-term structural strength or short-term structural strength such as during an earthquake. This is a design in which the load supporting portion 11 secures a fire-resistant layer that can withstand the load that supports the building, and a surrounding layer having a thickness according to the required fire resistance performance. For example, an ember design is provided with a 45 mm wood covering for 1 hour of semi-fire performance.

As shown in FIGS. 1A and 1B, the fire-resistant wooden structural member 1 of the first embodiment has a load supporting portion 11 at the center of the cross section, and a portion around the load supporting portion 11. The four sides are surrounded by the first lamina laminated portion 13 or the second lamina laminated portion 14 constituting the burning layer 12.
In addition, the fire-resistant wooden structural material 1 of the first embodiment has a core 2 at the center of the transverse section, and four sides around the core are surrounded by a lamina laminate 3 having a structure in which a plurality of laminas are laminated. Have been.
Further, in the fire-resistant wooden structural material 1, as shown in FIG. 1A, the first lamina laminated portions 13, 13 and the second lamina laminated portions 14, 14 apply to the four side surfaces a to d of the fire-resistant wooden structural material 1. Along the burning layers 12a to 12d are formed. More specifically, the first burn-through layers 12b and 12d along the two side surfaces b and d of the four side surfaces a to d along the axial direction are formed of the first lamina laminated portions 13 and 13, respectively. The 1 lamina laminated portions 13, 13 are formed from lamina laminated bodies 3, 3 located on both sides of the core portion 2 in one direction Y of the cross section of the refractory wooden structural material 1, and are provided on the remaining two side surfaces a, c. The second evaporating layers 12a, 12c along the second laminating layers 12, 14 are composed of the second laminating sections 12, 14, and the second laminating sections 12, 12 are orthogonal to one direction Y of the cross section of the refractory wooden structure 1. It is formed from lamina laminates 3, 3 located on both sides of the core 2 in the direction X.
The expression that the first lamina laminate 13 or the second lamina laminate 14 is formed from the lamina laminate 3 means that the first lamina laminate 13 or the second lamina laminate 14 has a thickness of the lamina laminate 3. The first lamina laminated portion 13 is formed from a part of the side surfaces b and d in the thickness direction of the lamina laminated body 3, and the second lamina laminated portion 14 is formed from the lamina laminated body 3. And the case where it is formed from a part of the side surface a, c side in the thickness direction.

  On both sides of the load supporting portion 11 (or the core portion 2) in one direction Y of the cross section of the fire-resistant wooden structural material 1, a first lamina laminated portion 13 whose lamination direction is a direction X orthogonal to the one direction Y is provided. The term “having” means that at least a portion where the load supporting portion 11 (or the core portion 2) exists in the direction X orthogonal to the one direction Y, the first laminating portion 13 may be provided. A second laminating section 12 having one direction Y or a direction X perpendicular to the one direction on one side or both sides of the load supporting section 11 (or the core section 2) in a direction X orthogonal to the laminating direction. It is sufficient that at least the portion where the load support portion 11 (or the core portion 2) exists in the one direction Y has the second lamina laminated portion 12, but from the viewpoint of exhibiting more excellent fire resistance performance, As shown in FIGS. 1 (a) and 1 (b) Preferably, four sides around the load supporting portion (or the core portion 2) in the cross section of the fire-resistant wooden structural material are continuously surrounded by the first lamina laminated portion 13 and the second lamina laminated portion 14, It is preferable that the ember layer 12 composed of the first lamina laminated portion 13 or the second lamina laminated portion 14 is formed continuously over four side surfaces a to d of the fire-resistant wooden structural material 1.

The refractory wooden structure 1 includes first burnable layers 12 b and 12 d located on both sides of the load supporting portion 11 in one direction Y of the cross section of the refractory wooden structure 1 as the burnable layer 12. The second afterburning layers 12a and 12c are located on both sides of the load supporting portion 11 in a direction X orthogonal to one direction Y of the cross section.
Each of the first assembling layers 12b and 12d is formed from the first lamina laminated portion 13 whose laminating direction is the direction X orthogonal to the one direction Y, and each of the second assembling layers 12a and 12c is arranged in one direction Y. It is formed from the second laminating section 14 in the laminating direction. In the refractory wooden structural material 1, the first lamina laminated portions 13 and 13 that form the first burn-through layers 12b and 12d, and the second lamina laminated portions 14 and 14 that form the second burn-through layers 12a and 12c, Each of them is composed of the lamina laminate 3.

As shown in FIG. 1A and FIG. 1B, the first lamina laminated portions 13 in the fire-resistant wooden structural material 1 and the lamina laminated body 3 that constitutes them are arranged in a direction X (laminated laminated Direction). The first laminating section 13 includes a portion 13s (first portion) existing in a portion where the load supporting portion 11 exists in a direction X orthogonal to the one direction Y, and a portion 13e (second portion) extending from the portion 13s. Part).
As shown in FIGS. 1 (a) and 1 (b), the second lamina laminated portions 14 in the refractory wooden structural material 1 and the lamina laminated body 3 constituting them are arranged between the first lamina laminated portions 13, 13. Over the whole area. Further, the second laminating portion 14 is formed only of the portion where the load supporting portion 11 exists in one direction Y.
In the fire-resistant wooden structural material 1, the first lamina laminated portions 13, 13 and the second lamina laminated portions 14, 14 thus surround four sides of the load supporting portion 11 in the cross-section in this manner, and An ember layer 12 is formed continuously over four side surfaces.

  The present inventors have formed a fire-retardant layer 12 from a lamina laminate 3 having a structure in which lamina is laminated, but also have a high fire resistance performance, preferably a fire-resistant wooden structural material having a fire resistance performance of one hour and a fire stop function. As a result of studying the fire resistance performance of the laminated wood in which the state of the annual rings possessed by lamina was developed, the lamina laminate was arranged so that the direction along the circumferential direction of the cross section was the lamination direction and burned When the laminated wood with the layer is exposed to a flame, the carbonized layer formed by the burning of the burning layer is cracked along the lamina annual rings (more specifically, the early wood portion of the annual rings). Along with the fact that combustion along the fire-resistant wooden structural material easily proceeds, and that the burning of the cracks is a factor that hinders burning, and further studies based on such knowledge Complete the present invention .

In the fire-resistant wooden structural material 1 of the first embodiment, the laminar 4 constituting each of the first lamina laminated portion 13 and the second lamina laminated portion 14 has a fast-wood portion 42 in the cross section of the fire-resistant wooden structural material 1. An annual ring discontinuous lamina 40 that does not include a continuous annual ring 44 (see FIG. 3 (e)) extending between both ends in a direction orthogonal to the laminating direction of the lamina 4. 3 (b) to 3 (d) show examples of the annual ring discontinuous lamina 40. FIG. Each of the first lamina laminated portion 13 and the second lamina laminated portion 14 has a structure in which a plurality of annual ring discontinuous laminas 40 are laminated and bonded.
The annual rings 41 are concentric rings that can be seen in the cross section of a tree (log), and the trunks and roots of the tree (log) are formed in one year, and there are many lumber parts 42 and 43 formed in one year. Since the quality is coarse (early wood portion 42) and less dense in winter (late wood portion 43), both are alternately arranged in a ring shape. As shown in FIG. 3A, the late material portion 43 is a portion having a high density and a dark color, and is a portion forming the outer edge of the annual ring 41. The early material portion 42 is a portion having a lower density and a lighter color than the late material portion 43, and is a portion in which the cells are large and the cell wall is thinner than the late material portion 43.

As an example of the annual ring discontinuous lamina 40, as shown in FIG. 3B, it has a wooden surface 40 u and a wooden back 40 d, and in the rectangular cross section of the lamina 4, the fast-wood portion 42 is stacked in the laminating direction of the lamina 4. The one without the continuous annual ring 44 (see FIG. 3 (e)) extending between both ends in the direction orthogonal to. The wooden back 40d is a surface forming one long side of the rectangular cross section of the lamina 4 and is a surface closer to the tree core 46 of the raw wood. This is the surface that forms the other long side that faces away from the tree core 46 of the raw wood.
As another example of the annual ring discontinuous lamina 40, as shown in FIG. 3 (c) or FIG. 3 (d), a wooden surface is formed on two surfaces forming a pair of opposed long sides of the rectangular cross section. Lamina (straight-grained lamina) 4 having no distinction between 40u and wooden back 40d.
On the other hand, as shown in FIG. 3 (e), the continuous lamina 45 which does not correspond to the annual ring discontinuous lamina has a wooden surface 45 u and a wooden back 45 d. 4 having a continuous annual ring 44 extending between both ends in the longitudinal direction. It should be noted that even if the lamina 4 has an annual ring extending between both ends in the short direction, such as a lamina 4 having no distinction between the wooden surface 40u and the wooden back 40d shown in FIG. 3 (c) or FIG. It may correspond to discontinuous lamina 40.

  The fire-resistant wooden structural member 1 of the first embodiment has a laminated structure in which the first lamina laminated portions 13 and 13 and the second lamina laminated portions 14 and 14 that form the burning layer 12 are laminated with the annual ring non-continuous lamina 40. Have. Therefore, when the four side surfaces a to d including the first lamina laminated portions 13, 13 and the second lamina laminated portions 14, 14 of the fire-resistant wooden structural material 1 are exposed to the flame at the time of fire, the laminated lamina 3 is formed. Cracks are formed along the early wood portion 42, and due to such cracks, cracks are formed along the cracks in the carbonized layer formed by burning the lamina laminate 3, The loss of the portion is suppressed, and a dense carbonized layer excellent in the heat conduction suppressing effect or the oxygen blocking effect is formed in the vicinity of the side surfaces a to d of the refractory wooden structure 1. As a result, the fire-resistant wooden structural material 1 has excellent fire resistance even if the burn-out layer does not contain a flame retardant, and typically has a fire resistance of 1 hour and a burning function. It will be.

In the fire-resistant wooden structural material 1 of the first embodiment, the first lamina laminated portions 13 each have a portion 13s that exists in a portion where the load support portion 11 (or the core portion 2) exists in the direction X orthogonal to the one direction Y. It is preferable that all the laminas 4 are discontinuous laminas 40 with annual rings from the viewpoint of improving the fire resistance and the burning function. Specifically, the ratio of the number of the non-continuous laminas 40 in the portion 13s to the total number of the laminas 4 in the portion 13s ((the number of non-continuous laminas in the ring / the total number of laminas) × 100) is 90%. Preferably, it is at least 100%. In the present specification, the number of the laminas 4 and the number of the non-continuous laminas 40 are the number of laminas existing in the laminating direction, and the lamina 4 and the non-continuous lamina 40 are longitudinally spliced in the longitudinal direction by fingering or the like. In the case of a plurality of small laminas, the plurality of vertically connected small laminas are counted as one.
From a similar point of view, the first lamina laminated portion 13 includes a non-continuous annual ring lamina 40 in both portions 13s, 13e with respect to the total number of laminas 4 in the portion 13s and the portions 13e, 13e extending from the portion 13s. (The number of lamina discontinuous in annual rings / the number of laminas constituting the first lamina laminated portion 13) × 100) is preferably 90% or more, and more preferably 100%.

  When the annual ring discontinuous lamina 40 shown in FIG. 3 (c) or FIG. 3 (d) is used for the portion 13e extending from the portion 13s of the first lamina laminated portions 13, 13, the side surfaces a, c are When exposed to a flame, the carbonized layer formed on the annual ring discontinuous lamina 40 may have cracks along the fast-wood portion 42 from the heated surface (side surfaces a and c) to the surface opposite to the heated surface. Although possible, due to the physical boundary between the annual ring discontinuous lamina 40 and the annual ring discontinuous lamina 40 adjacent to the annual ring discontinuous lamina 40, the cracks and the like continue inside the adjacent annual ring discontinuous lamina 40. Formation is suppressed.

  From the same viewpoint, the second laminating section 14 is configured such that all the laminas 4 of the portion 14s existing in the portion where the load supporting portion 11 (or the core portion 2) exists in one direction Y are formed by the annual ring discontinuous lamina 40. Is preferred from the viewpoint of improving the fire resistance performance and the burning function. Specifically, the second laminating section 14 has a laminated structure in which a plurality of annual ring non-continuous laminas 40 are laminated and bonded over the entire area between the first laminating sections 13, 13. Is preferred. Specifically, the ratio of the number of the non-continuous lamina 40 in the portion 14s to the total number of the laminas 4 in the portion 14s ((the number of non-continuous laminas in the ring / the total number of laminas) × 100) is 90%. Preferably, it is at least 100%.

  The cross-sectional configuration of the fire-resistant wooden structural material according to the present invention may be such that the cross section at any position in the axial direction, such as the central position in the axial direction, satisfies the conditions defined in the present invention. Preferably satisfies the conditions defined in the present invention. If each cross section at the position of 20 cm from both ends in the axial direction and the center position in the axial direction of the refractory wooden structural material satisfies the conditions required for the cross section of the present invention, the cross section in the entire axial direction is It is assumed that the conditions required for the cross section of the present invention are satisfied.

The burning layer 12 of the fire-resistant wooden structural material 1 has fire resistance of at least one hour on any of the four side surfaces a to d. More specifically, the refractory wooden structural material 1 includes first burn-out layers 12b and 12d composed of first laminated lamina portions 13 and 13 and second burn-off layers 12a and 12c composed of second laminated laminar portions 14 and 14. After heating for 1 hour according to the ISO834 standard heating curve, and allowed to cool for 5 hours, the depth from the four side surfaces a to d is 50 mm, preferably 60 mm, more preferably 70 mm. Has a burning performance that combustion does not reach.
The thickness of each of the first and second laminating portions 13 and 14 functioning as the afterburning layers 12 surrounding the four sides around the load supporting portion 11 (or the core portion 2) (from each side a to d of the fire-resistant wooden structural material 1 The distance to each outer edge of the load support portion 11 facing the side surfaces a to d) is preferably 50 mm or more, more preferably 60 mm or more, and more preferably 70 mm or more, from the viewpoint of improving fire resistance performance, particularly, improving burning performance. More preferred.
From the same viewpoint, the thickness of the lamina laminate 3 surrounding the four sides around the core 2 (from each side a to d of the refractory wooden structural material 1 to each outer edge of the core 2 opposed to each side a to d) The distance (same as La to Ld in the example shown in FIG. 1) is preferably 50 mm or more, more preferably 60 mm or more, and even more preferably 70 mm or more.

  FIG. 1 and FIG. 2 show the thicknesses of the first laminating layers 12b and 12d and the thickness of the first lamina laminated portion 13 that constitutes them for the refractory wooden structural materials 1 and 1A of the first and second embodiments. Although the case where the length (length in the direction Y) and the thickness (the length in one direction Y) of the lamina laminate 3 forming the first lamina laminated portion 13 match is shown, the first burnout is shown. The thicknesses of the margin layers 12b and 12d and the first lamina laminated portion 13 may not be the same as the thickness of the lamina laminated body 3 forming the first lamina laminated portion 13. For example, the thickness (the length in one direction Y) of the first burn-through layers 12b and 12d and the first lamina laminated portion 13 that constitutes them is equal to the thickness of the lamina laminated body 3 forming the first lamina laminated portion 13. (Length in one direction Y) may be shorter than that, even in that case, with respect to the annual ring discontinuous lamina 40, the distance between both ends of the lamina 4 in a direction orthogonal to the laminating direction of the lamina 4 It is not in the range from the surface to the load supporting portion 11, but between the two ends of the lamina laminate 3 in one direction Y.

FIGS. 1 and 2 show the thicknesses of the second burn-through layers 12a and 12c or the second burn-through layer 12 of the refractory wooden structural materials 1 and 1A of the first and second embodiments, and constitute them. The thickness of the second lamina laminate 14 (the length in the direction X orthogonal to the one direction Y) and the thickness of the lamina laminate 3 forming the second lamina laminate 14 (in the direction X perpendicular to the one direction Y). Length), the thickness of the second burn-through layers 12a, 12c or the second burn-through layer 12c and the thickness of the second lamina laminated portion 14 that constitutes them, and The thickness of the lamina laminate 3 forming the second lamina laminate portion 14 may not be the same. For example, the thickness (the length of the direction X perpendicular to the one direction Y) of the second burn-through layers 12a and 12c or the second burn-through layer 12c and the second lamina laminated portion 14 that constitutes the second burn-out layer 12c, The thickness of the lamina laminate 3 forming the portion 14 may be shorter than the thickness (the length of the direction X orthogonal to the one direction Y). The term “between both ends of the lamina 4 in the orthogonal direction” does not refer to the range from the surface of the refractory wooden structure 1 to the load support portion 11, but rather means between the both ends of the lamina laminate 3 in the direction X that is orthogonal to one direction Y.
In addition, from the viewpoint of improving the fire resistance performance, particularly the improvement of the burning performance, the individual annual ring discontinuous lamina 40 constituting the first lamina laminated portion 13 or the second lamina laminated portion 14 applies a load from the surface of the fire-resistant wooden structural material 1. Regarding the range up to the support portion 11, it is preferable not to have the fast-wood portion 42 of the annual ring 41 continuous between the both.

  As shown in FIGS. 2A and 2B, the fire-resistant wooden structural member 1A of the second embodiment burns along three side surfaces b1 to d1 among four side surfaces a1 to d1 extending along the axial direction. It has margin layers 12b to 12d. The load supporting portion 11 has a rectangular cross-sectional shape, and is surrounded by a combustible layer 12 on three sides. In addition, "the three sides are surrounded by the ember layer" means that the portion where the load support portion 11 exists in one direction Y and the portion where the load support portion 11 exists in the direction orthogonal to the one direction Y. 2 (a) and 2 (2) from the viewpoint of having a function of burning out and exhibiting excellent fire resistance performance. As shown in b), it is preferable that the burning layer 12 is formed continuously over three side surfaces b1 to d1 of the refractory wooden structure 1.

In the refractory wooden structure 1A, as shown in FIGS. 2A and 2B, an ember layer 12 is formed continuously over three side surfaces b1 to d1 of the refractory wooden structure 1A. The burning layer 12 includes first burning layers 12b and 12d located on both sides of the load supporting portion 11 in one direction Y of the cross section of the fire-resistant wooden structure 1A, and one direction Y of the cross section of the fire-resistant wooden structure 1A. And a second ember layer 12c located on one side in the direction X orthogonal to the direction of the arrow.
Each of the first assembling layers 12b and 12d is formed of a first laminating portion 13 having a laminating direction in a direction X orthogonal to the one direction Y, and the second assembling layer 12c is formed in a laminating direction in one direction Y. Is formed from the second laminating part 14. In the refractory wooden structural material 1A, the lamina laminate 3 constitutes the first lamina laminate portions 13, 13 and the second lamina laminate portion 14, and constitutes the first burn-off layers 12b, 12d and the second burn-off layer 12c. are doing.
Each of the first laminating sections 13 extends between both ends in a direction X (laminating direction) perpendicular to one direction Y. Each of the first laminating portions 13 includes a portion 13s (first portion) located at the same position as the load support portion 11 in a direction X orthogonal to the one direction Y, and a portion 13e (second portion) extending from the portion 13s. Part). The second laminating section 14 extends over the entire area between the first laminating sections 13. The second lamina laminated portion 14 is formed only from the portion where the load supporting portion 11 exists in one direction Y. In the fire-resistant wooden structural material 1A, the first lamina laminated portions 13, 13 and the second lamina laminated portion 14 thus surround three sides of the load supporting portion 11 in the cross section and are continuous over three side surfaces. The burning layer 12 is constituted.

  In the refractory wooden structure 1A of the second embodiment, the first lamina laminated portions 13 and 13 and the second lamina laminated portion 14 that form the ember layer 12 are formed of the fast-wood portion 42 in the cross section of the refractory wooden structural material 1A. Has a structure in which annual ring discontinuous lamina 40 having no continuous annual ring 44 extending between both ends in the longitudinal direction of lamina 4 is laminated.

  The fire-resistant wooden structural material 1A of the second embodiment has a laminated structure in which the first lamina laminated portions 13 and 13 and the second lamina laminated portion 14 forming the ember layer 12 are laminated with annual ring discontinuous lamina 40. ing. Therefore, when the three side surfaces b1 to d1 formed of the first lamina laminated portions 13 and 13 and the second lamina laminated portion 14 of the refractory wooden structural material 1A are exposed to the flame at the time of fire, they are formed on the side surfaces b1 to d1. In the carbonized layer to be formed, it is also possible to suppress the occurrence of cracks along the fast-wood portion 42 up to the load support portion 11 and the loss of a part of the carbonized layer due to such cracks. Near the side surfaces b1 to d1, a dense carbonized layer having an excellent heat conduction suppressing effect or oxygen blocking effect is formed. Accordingly, the fire-resistant wooden structural material 1A has a function of burning out and has excellent fire resistance performance.

In the fire-resistant wooden structural member 1A of the second embodiment, each of the first lamina laminated portions 13 is formed such that all the laminas 4 of the portion 13s existing in the portion where the load supporting portion 11 exists in the direction X orthogonal to the one direction Y are annual rings. Preferably, it is a discontinuous lamina 40. More specifically, the ratio of the number of the non-continuous lamina 40 to the number of all the laminas 4 in each of the portions 13s ((the number of non-continuous laminas in the annual ring / the number of all laminas in each of the portions) × 100) , 90% or more, and more preferably 100%. When the annual ring discontinuous lamina 40 is present in the portion 13s, when the side surfaces b and d are exposed to the flame and the first burn-off layers 12b and 12d burn, cracks along the fast-wood portion 42 are caused by the load supporting portion. Thus, it becomes difficult to form the first and second burn-off layers 12b and 12d.
From a similar viewpoint, in each first lamina laminated portion 13, it is more preferable that all the laminas 4 of the portion 13s and the portions 13e extending from the portion 13s are the annual ring discontinuous lamina 40. Specifically, the ratio of the number of the annual ring discontinuous laminas 40 to the number of all the laminas 4 of the portion 13s and the portions 13e and 13e extending from the portion 13s (((Number of annual ring discontinuous laminas / the The number of all the laminas of the portion extending from the portion) × 100) is preferably 90% or more, and more preferably 100%.

  From the same viewpoint, in the second laminating section 14, it is preferable that all the laminas 4 of the portion 14s existing in the portion where the load supporting portion 11 exists in one direction Y are the annual ring discontinuous lamina 40. In other words, the second laminating section 14 has a laminated structure in which a plurality of annual ring discontinuous laminas 40 are laminated and bonded over the entire area between the first laminating sections 13, 13. preferable. Specifically, the ratio of the number of non-continuous annual laminas 40 to the number of all laminas 4 in the second laminating portion 14 ((the number of non-continuous laminas in annual ring / the number of laminas in each of the second laminating portions) × 100) is preferably 90% or more, and more preferably 100%. When the second laminating section 14 has the above-described laminated structure, when the side surfaces a and c are exposed to the flame and the second burning margin layer 12c burns, the cracks along the early wood portion 42 cause a load. It becomes difficult to form the support portion 11, and the second burn-off layer 12c easily burns and exhibits a function.

The burning layer 12 of the fire-resistant wooden structural material 1A has fire resistance of at least one hour on any of the three side surfaces b1 to d1. More specifically, in the refractory wooden structural material 1A, each of the first burn-off layers 12b and 12d composed of the first lamina laminated portions 13 and 13 and the second burn-off layer 12c composed of the second lamina laminated portion 14 is provided. When heated for 1 hour according to the ISO834 standard heating curve and then left to cool for 5 hours, combustion reaches a depth of 70 mm, preferably 60 mm, more preferably 50 mm from the three side surfaces b1 to d1. Has no burning performance.
The thickness of each of the first and second lamina laminated portions 13 and 14 functioning as an afterburning layer 12 surrounding three sides around the load supporting portion 11 (or the core portion 2) (each from the side surfaces b1 to d1 of the fire-resistant wooden structural material 1A). The distance to each outer edge of the load support portion 11 facing the side surfaces b1 to d1) is preferably 50 mm or more, more preferably 60 mm or more, and more preferably 70 mm or more, from the viewpoint of improving the fire resistance performance, in particular, the improvement of the burning function. More preferred.
From the same viewpoint, the thickness of the lamina laminate 3 surrounding the three sides around the core 2 (from each side b1 to d1 of the fire-resistant wooden structural material 1 to each outer edge of the core 2 opposed to each side b1 to d1) The distance (same as Lb to Ld in the example shown in FIG. 2) is preferably 50 mm or more, more preferably 60 mm or more, and even more preferably 70 mm or more. The thickness Lc of the second burn-through layer 12c (the distance from the side surface c1 of the refractory wooden structural material 1A to the outer edge of the core portion 2 facing the side surface c1) Lc is the thickness Lb of the first burn-through layer 12b, 12d. Thickness greater than Ld is preferable in that it can cover the corners where heat is easily transmitted while suppressing the volume.
The fire-resistant wooden structural material 1A of the second embodiment is a structural material for a beam, and the load supporting portion 11 is covered by a floor having fire-resistant performance mounted on a side surface a1 serving as an upper surface during use. An ember layer covering the upper side of the load support 11 is not provided.

In the fire-resistant wooden structural material of the present invention, the first lamina laminated portions 13 and 13 and the second lamina laminated portions 14 and 14 are laminated with four or more annual ring non-continuous laminas 40 that do not include the continuous annual ring 44. Part. Here, “four or more annual ring discontinuous laminas 40” means that if the number of laminated annual ring discontinuous laminas 40 is four or more, including the annual ring discontinuous lamina 40 of the extending portion 13e. good.
Each of the first lamina laminated portions 13 forming the first burn-through layers 12b and 12d is a non-continuous annual ring lamina located in a portion 13s existing in a portion where the load supporting portion 11 exists in a direction X orthogonal to the one direction Y. 40 is preferably 4 to 300, more preferably 8 to 250, and still more preferably 12 to 150. In addition, the first lamina laminated portions 13 forming the first burn-off layers 12b and 12d preferably have 7 to 303, more preferably 14 to 256 laminated layers including the lamina 2 of the extending portion 13e. And more preferably 21 to 159.

Moreover, in the fire-resistant wooden structural material of the present invention, the thickness of the lamina 4 (or 40) constituting each of the lamina laminates 3 constituting the first lamina laminates 13 and 13 and the second lamina laminates 14 and 14 is preferable. Is 30 mm or less, more preferably 15 mm or less, and still more preferably 10 mm or less. The width of the lamina 4 (or 40) is not less than the thickness, preferably not less than 2 times and not more than 50 times the thickness, more preferably not less than 5 times and not more than 30 times the thickness.
In the first laminating section 13 and the second laminating section 14 and the laminating body 3 constituting them, the surfaces forming the long sides of the oblong rectangle, which is the cross-sectional shape of the lamina 4, are brought into contact with each other to form the laminating section. 4 are laminated and bonded.

  As shown in FIGS. 1 (a) and 2 (a), the fire-resistant wooden structural members 1 and 1A of the first and second embodiments have a first lamina laminated portion 13 forming first burn-through layers 12b and 12d. , And 13 are non-continuous annual ring laminas 40 in which all of the laminas 4 have a wooden surface 40u and a wooden back 40d as shown in FIG. 3B. In addition, in the fire-resistant wooden structural members 1 and 1A of the first and second embodiments, the second lamina laminated portions 14 and 14 that form the second ember layers 12a and 12c are all composed of the lamina 4 shown in FIG. ) Is an annual ring discontinuous lamina 40 having a wooden surface 40u and a wooden back 40d as shown in FIG. Instead of this, all the laminating parts 13 and 13 forming the first burn-off layers 12b and 12d and the second laminating part 14 and 14 forming the second burn-off layers 12a and 12c are formed. The lamina 4 or a part of the lamina 4 may be a non-continuous annual ring lamina 40 having no distinction between the wood surface 40u and the wood back 40d, like the lamina 40 shown in FIG. 3 (c) or FIG. 3 (d). preferable. The annual ring discontinuous lamina 40 may be a lamina 4 having a wooden surface 40u and a wooden back 40d, or a lamina 4 having no distinction between the wooden surface 40u and the wooden back 40d, and these may be mixed.

The annual ring non-continuous lamina 40 constituting the fire-resistant wooden structural material 1 of the first embodiment is made of wood of the same tree type. The annual ring discontinuous lamina 40 constituting the fire-resistant wooden structural material 1A of the second embodiment is also made of wood of the same tree type. However, as the annual ring discontinuous lamina 40, only those derived from a single tree species may be used, or those obtained from a plurality of tree species may be used in combination. Any species of wood can be used as a raw material for the annual ring discontinuous lamina 40. For example, if it is a conifer, larch, pine, Dafrica larch, pine, hemlock, etc., if it is a broadleaf tree, it is zelkova. , Chestnut, oak, ash etc. can be used.
Further, the individual annual ring discontinuous lamina 40 has a shape that is long in the same direction as the axial direction of the refractory wooden structural material 1, 1A. The individual annual ring discontinuous lamina 40 may be a single ground plate or the like that is continuous over the entire axial length of the refractory wooden structural material 1, 1 </ b> A. Alternatively, a plurality of ground plates or the like may be joined in the axial direction by a joining method such as a finger joint.

The lamina laminated portions 13 and 14 in the fire-resistant wooden structural material 1 of the first embodiment and the lamina laminated portions 13 and 14 in the fire-resistant wooden structural material 1A of the second embodiment have gaps between the annual ring non-continuous laminas 40 included therein. The first and second laminating portions 13 and 14 are also joined together by an adhesive.
As the adhesive for joining the annual ring non-continuous laminas 40 or the lamina laminated portions 13 and 14, various known adhesives conventionally used in the production of laminated wood can be used. -An isocyanate adhesive, a resorcinol resin adhesive, a resorcinol / phenol resin adhesive, a melamine resin adhesive, a melamine urea resin adhesive, a urethane resin adhesive, an epoxy resin adhesive, and the like. Among these, a resorcinol resin adhesive or a resorcinol-phenol resin adhesive is preferable.

  The fire-resistant wooden structural materials 1 and 1A of the first and second embodiments are, for example, arranged with an adhesive between the annual ring non-continuous laminas 40 and are laminated and pressed, as shown in FIG. 1 (b) or FIG. 2 (b). After the laminating sections 13 and 14 are manufactured, the laminating sections 13 and 14 can be manufactured by disposing an adhesive between the laminating sections 13 and 14 and laminating and pressing the laminating sections 13 and 14. However, each can be manufactured by an arbitrary procedure.

Further, in the fire-resistant wooden structural materials 1 and 1A of the first and second embodiments, the annual ring discontinuous lamina 40 used in the lamina laminated portions 13 and 14 or the lamina laminated body 3 constituting the laminated laminating portions 13 and 14 is, for example, a tree core 46 in the center. In the cross section of the raw wood having, at an arbitrary position, with respect to the width W of the annual ring discontinuous lamina 40 arbitrarily set, the distance from the tree core 46 to the end of the annual ring discontinuous lamina 40 on the tree core 46 side. r, the height H of the annual ring discontinuous lamina 40 that satisfies the following equation 1 is calculated, the allocation position of the annual ring discontinuous lamina 40 to the cross section of the log is set, and based on the set allocation position. It can be manufactured efficiently by cutting raw wood.
H <r [1- {1- (W / 2r) ² } ^1/2 ] (Equation 1)
By using the above-described method, there is no need to separately select a non-continuous annual lamina 40 from the manufactured lamina 4, and the non-continuous annual lamina 40 can be efficiently manufactured.
The distance r and the height H of the annual ring discontinuous lamina 40 may be calculated manually, or may be calculated using arithmetic means such as a computer.

The fire-resistant wooden structural material of the present invention uses a computer to assign a cross section of a plurality of annual ring non-continuous laminas 40 in a true circle assuming a log. In order to obtain the continuous lamina 40, it is also preferable to manufacture by obtaining a step of cutting an actual log and a step of joining the obtained annual ring non-continuous lamina 40 to obtain a fire-resistant wooden structural material. In the stacking process, it is a matter of course that the refractory wooden structural material may be manufactured by combining laminas obtained from different logs.
In the refractory wooden structural material obtained by such a method, the actual log wood may have individual differences in the shape of the annual rings, etc., but lamina that is not the annual ring discontinuous lamina 40 may be mixed. The fire-resistant wooden structural material of the present invention includes such a fire-resistant wooden structural material.

Although some embodiments of the present invention have been described above, the present invention is not limited to such embodiments, and can be appropriately modified.
For example, like the fire-resistant wooden structural member 1B of the pillar shown in FIG. 4, the laminating direction of the annual ring non-continuous lamina 40 forming the second lamina laminated portions 14, 14 forming the second ember layers 12a, 12c is as follows. The direction X orthogonal to the one direction Y may be used. That is, all the annual ring discontinuous laminas 40 constituting the first and second laminating sections 13 and 14 may be arranged so as to face in the same direction.

  Further, as in the columnar fire-resistant wooden structural material 1C shown in FIG. 5, the first lamina laminated portions 13, 13 forming the first burn-off layers 12b, 12d are provided in the portion where the load supporting portion 11 is present. 13s and a portion 13e extending from the portion 13s, and the second lamina laminated portions 14, 14 forming the second ember layers 12a, 12c are replaced by a portion 14s existing in the portion where the load supporting portion 11 is present. And a portion 14e extending from the portion 14s.

  In addition, like the fire-resistant wooden structural material 1D of the pillar shown in FIG. 6, a portion 13s existing in a portion where the load supporting portion 11 of the first lamina laminated portions 13, 13 forming the first ember layers 12b, 12d exists. 13e, 13e extending from the first laminating section 13 and the laminar 4 of the second laminating section 14 may be formed by laminating lamina having an L-shaped cross section. Good.

  Also, like the fire-resistant wooden structural member 1E of the beam shown in FIG. 7, the laminating direction of the annual ring discontinuous lamina 40 constituting the second lamina laminating portion 14 forming the second ember layer 12c is orthogonal to one direction Y. May be arranged so as to face the direction X in which That is, all the non-continuous annual ring laminas 40 constituting the first and second laminating sections 13 and 14 may be arranged so as to face the same direction in the laminating direction of the lamina 4.

  Also, as in the case of the refractory wooden structural material 1F of the beam shown in FIG. 8, the first lamina laminated portions 13 and 13 are constituted by the portion 13s existing in the portion where the load supporting portion 11 exists, and the second lamina laminated portion 14 is formed. It may be constituted by a portion 14s existing in the portion where the load supporting portion 11 exists, and portions 14e, 14e extending from the portion 14s.

  In addition, like the refractory wooden structural member 1G of the beam shown in FIG. 9, a portion 13s existing in the portion where the load supporting portion 11 of the first lamina laminated portions 13, 13 forming the first ember layers 12b, 12d exists. One of the portions 13e, 13e extending from the lamination is formed by laminating laminas having an L-shaped cross section in which the lamina 4 of the first lamina lamination portion 13 and the lamina 4 of the second lamina lamination portion 14 are joined. It may be.

  4 to 6, the same components as those of the fire-resistant wooden structural member 1 of the first embodiment are denoted by the same reference numerals as those of the first embodiment. 7 to 9, the same components as those of the fire-resistant wooden structural member 1A of the second embodiment are denoted by the same reference numerals as those of the second embodiment.

  In addition, the lamina laminate 3 is the first and second lamina laminates 13 and 14 and the first and second lamina laminates 13 and 14 are the burn-off layer 12. Regions located outside the edge on the part side may be the first and second lamina laminated parts 13 and 14, which may be used as the burn-off layer 12. That is, the burning layer does not necessarily need to be composed of the entire lamina laminate.

In addition, instead of having the load supporting portion 11 have the same laminating portion as the first laminating portion 13 and the second laminating portion 14, a laminating portion having a laminating surface of a solid material or a wooden surface is used. The laminating section may be formed of a laminating direction in which the direction perpendicular to the laminating direction of the first lamina laminating sections 13, 13 of the first ember layers 12 b, 12 d is the laminating direction of the lamina 4.
Moreover, the fire-resistant wooden structural material of the present invention may be a columnar member having a rectangular cross-sectional shape or a beam member having a square cross-sectional shape.

  When the fire-resistant wooden structural material of the present invention is used as a beam of a wooden building, in the above-described embodiment, the floor is placed on the upper surface a1 without providing an ember layer covering the upper side of the load supporting portion 11. Although the upper side of the load supporting portion is covered, instead, an ember layer covering the upper side of the load supporting portion 11 is provided, and the four side surfaces a1 to d1 of the load supporting portion 11 are covered with the evaporating layer. You may make it.

(Example 1)
Twelve annual ring non-continuous laminas 40 (density 0.47 g / cm ³ ± 10%) shown in FIG. 3B are laminated and bonded, and the first lamina laminated portions 13 and 13 and the second lamina laminated portion shown in FIG. Laminate laminates 14 and 14 were manufactured. The annual ring discontinuous lamina 40 was obtained from larch, and a resorcinol-phenol resin adhesive was used for bonding between the annual ring discontinuous laminas 40.
The manufactured lamina laminate had a cross-sectional dimension of 337 mm × 120 mm and a length of 400 mm. The manufactured lamina laminate was formed by alternately bonding the wooden surfaces 40u and the wooden backs 40d. The configuration other than the above, preferred dimensions, and the like were the same as those of the above-described embodiment. A surface other than one surface of the manufactured lamina laminate having a length and width of 337 mm × 400 mm was cured with a ceramic blanket and a gypsum board to obtain a test specimen of Example 1.

(Example 2)
As the lamina 4 constituting the lamina laminate, an annual ring discontinuous lamina 40 (density 0.50 g / cm ³ ± 10%) shown in FIG. 3C was used. Except for the above, the test body of Example 2 was manufactured in the same procedure as in Example 1.
(Comparative Example 1)
The same procedure as in Example 1 was followed, except that a continuous lamina 45 (density 0.52 g / cm ³ ± 10%) shown in FIG. 3E was used as the lamina 4 constituting the lamina laminate. Test specimens were manufactured.

(Evaluation)
(Flame test)
The test specimens obtained in Example 1, Example 2, and Comparative Example 1 were accommodated in a combustion test furnace. In the test body, one surface having a length and width of 337 mm × 400 mm is a heated surface to be heated. Then, heating was performed for one hour by standard ISO834 heating assuming a normal fire, and after the heating was completed, the furnace was allowed to cool for at least three times the heating time (3 hours or more, about 5 hours). And the depth of the crack which occurred in the carbonized layer formed in the lamina laminated body of each test body was measured, and the presence or absence of the residual flame of the carbonized layer was confirmed. The crack depth was measured for each of the cracks generated in the carbonized layer formed on the bonding surfaces of the laminas 4 and the crack generated in the carbonized layer formed on the laminas 4. As the cracks in the carbonized layer, the maximum depth and the minimum depth from the heating surface were measured, and the average depth was calculated. Table 1 shows the results.

As shown in Table 1, in Comparative Example 1, after-flame was confirmed in the carbonized layer, whereas in Examples 1 and 2, no after-flame was confirmed in the carbonized layer. Also, in Examples 1 and 2, the maximum depth of the crack generated in the carbonized layer formed on the bonding surface of Comparative Example 1 was larger than the maximum depth of the crack generated in the carbonized layer formed on the bonding surface of Comparative Example 1. It can be seen that it is shallow and that cracking can be suppressed to the inside of the bonding surface. In Example 1 and Example 2, the maximum depth of the crack generated in the carbonized layer formed on the annual ring discontinuous lamina 40 itself occurred in the carbonized layer formed on the continuous lamina 45 itself of Comparative Example 1. It can be seen that the depth is shallower than the maximum depth of the crack, and the occurrence of cracks inside the lamina 4 can be suppressed.
From this, the refractory wooden structural material having an afterburning layer constituted by the lamina laminate of Comparative Example 1 was carbonized by the combustion of the first lamina laminates 13 and the second lamina laminates 14. In the layer, cracks occur along the lamina rings (more specifically, the early wood part of the annual rings), and the combustion along the cracks is likely to progress into the interior of the refractory wooden structure, and It turns out that combustion is a factor that hinders burning.
On the other hand, in the fire-resistant wooden structural material having an ember layer constituted by the lamina laminates of the first and second embodiments, the combustion of the first lamina laminates 13 and 13 and the second lamina laminates 14 and 14 is performed. It can be seen that the cracks generated in the carbonized layer formed by the cracking are suppressed from progressing into the lamina 4 and the bonding surface, and the combustion along the cracks can be suppressed from progressing inside the refractory wooden structural material.

1, 1A to 1G Fire-resistant wooden structural material 2 Core 3 Lamina laminate 4 Lamina 11 Load support 12 Burn-off layers 12b, 12d First burn-through layers 12a, 12c Second burn-through layer 13 First lamina laminate 13s Load The portion existing in the portion where the supporting portion exists 13e The extending portion 14 The second lamina laminated portion 40 The annual ring discontinuous lamina 40u The wooden surface 40d The wooden back 41 The annual ring 42 The early lumber portion 43 The late lumber portion a to d, a1 to d1 Fireproof Side of wooden structural material Y One direction X Direction perpendicular to one direction

Claims (5)

A fire-resistant wooden structural material, which is a square member, has a load supporting portion, and has an ember layer formed along at least three of the four side surfaces extending in the axial direction,
On both sides of the load supporting portion in one direction of the cross section of the fire-resistant wooden structural material, a first lamina laminated portion having a direction perpendicular to the one direction as a laminating direction of lamina is provided, and a direction perpendicular to the one direction is provided. On one side or both sides of the load supporting portion, a laminating portion having a laminating direction of the one direction or a direction orthogonal to the one direction has a second laminating portion,
In the first lamina laminated portion and the second lamina laminated portion, the lamina constituting each is continuous across both ends of the lamina in a direction perpendicular to the laminating direction of the lamina in a cross section of the fire-resistant wooden structural material. It is a non-continuous lamina with annual rings that does not have the early wood part of the annual rings,
A fire-resistant wooden structural material, wherein a first and a second lamina laminated portion form an ember layer along the three or four side surfaces of the fire-resistant wooden structural material. The first lamina laminated portion is present at least in a portion where the load supporting portion exists in a direction orthogonal to the one direction, and the second lamina laminated portion is at least the load supporting portion present in the one direction. Exists in the part that
2. The fire-resistant wooden structure according to claim 1, wherein three or four sides around the load supporting portion in a cross section of the fire-resistant wooden structure are continuously surrounded by a first lamina laminated portion and a second lamina laminated portion. Wood.   The first lamina laminated portion extends between both ends of the fire-resistant wooden structural member in a direction orthogonal to the one direction, and the second lamina laminated portion extends over the entire area between the first lamina laminated portions. The refractory wooden structural material according to claim 1.   The fire-resistant wooden structure according to any one of claims 1 to 3, wherein the fire-resistant wooden structure is a pillar or a beam of a wooden building. Fire-resistant wood, which is a square lumber and has a core made of wood at the center of the cross section, and three or four sides around the core are surrounded by a lamina laminate having a structure in which a plurality of laminas are laminated. Structural material,
On both sides of the core in one direction of the cross section of the fire-resistant wooden structural material, a first lamina laminated portion having a direction perpendicular to the one direction as a laminating direction of lamina is provided, and in a direction perpendicular to the one direction. On one side or both sides of the core portion, the core has a second lamina laminated portion having the lamination direction of the one direction or a direction perpendicular to the one direction,
In the first lamina laminated portion and the second lamina laminated portion, the lamina constituting each is continuous across both ends of the lamina in a direction perpendicular to the laminating direction of the lamina in a cross section of the fire-resistant wooden structural material. It is a non-continuous lamina with annual rings that does not have the early wood part of the annual rings,
A fire-resistant wooden structural material, wherein the thickness of the lamina laminate surrounding three or four sides around the core is 50 mm or more.

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