JP7071249B2 - Joint structure of structural materials - Google Patents

Description

The present invention relates to a joint structure of structural materials.

When wood is heated from the outside during a fire, its surface burns to form a carbonized layer. When this carbonized layer is uniformly formed on the surface of the wood, the invasion of heat into the wood is suppressed and the structural deterioration inside the wood is suppressed. Utilizing this characteristic, the wood used for columns and beams is thickened, and a burning carbonized layer is placed on the surface of the wood so that a sound cross section that can support a long-term load is secured inside the wood after combustion. There is known a technique for providing a burnt margin having a predetermined thickness to be formed. It is also practiced to make a wooden building a semi-fireproof building by using a structural material or the like provided with such a burn margin for the main structural part.

Various techniques for joining members of fire-resistant materials having a burn margin on the surface of wood or a composite material of wood and other materials have been proposed. For example, Patent Document 1 describes the position inside the burn margin layer. There has been proposed a joining structure of a structural material in which a recess in which a burn stop member constituting the burn stop layer is exposed is provided in a column, and a beam is brought into contact with the recess to join the column to the beam. Further, Patent Document 2 and Patent Document 3 propose a joining structure in which a column core material and a beam core material are connected and a connecting plate for joining the beam to the column is surrounded by a burnout layer.

Japanese Unexamined Patent Publication No. 2008-014036 Japanese Unexamined Patent Publication No. 2012-219560 Japanese Unexamined Patent Publication No. 2012-219559

The joint structure of Patent Document 1 requires a separate step for forming a recess in the column, and the joint structure of Patent Document 2 and Patent Document 3 requires a connecting plate formed of a steel plate as an indispensable configuration. The manufacturing process becomes complicated and the manufacturing cost becomes high.

An object of the present invention is to provide a joint structure of a structural material capable of improving the fire resistance performance at a joint portion between the structural materials by a simple structure.

The present invention is a bonding structure of a structural material in which a second structural material is vertically bonded to a side surface of the first structural material, and the first structural material and the second structural material are square members, respectively, and have a core portion. The first structural material has a structure surrounded by a laminar laminate having a structure in which a plurality of laminas are laminated, and the first structural material is the core portion in the first direction of the cross section thereof. On both sides, there is a first fireproof coating layer made of a first lamina laminated body whose second direction orthogonal to the first direction is the laminating direction of the lamina, and one side of the core portion in the second direction of the cross section or A second fireproof coating layer made of a second laminar laminate whose first direction or second direction is the laminating direction of the laminar is provided on both sides, and the second structural material is on the side surface along the first fireproof coating layer. The specific first lamina laminate that is joined and forms the first fireproof coating layer along the side surface extends from the position of the edge of the second structural material in one direction parallel to the orthogonal direction. The laminars having the extending portion to be extended and constituting the extending portion both have a wood surface and a wood back, and the wood front side is a laminar facing outward in the extending direction of the extending portion. The above object is achieved by providing the joint structure of the structural material.

The joint structure of the structural material of the present invention can improve the fire resistance performance at the joint portion between the structural materials.

FIG. 1A is a perspective view showing a joint structure of the structural material according to the first embodiment of the present invention, and FIG. 1B is a plan view of the joint structure as viewed from the axial direction of the first structural material. Is. FIG. 2A is a cross-sectional view of the first structural material according to the joint structure of the structural material according to the first embodiment of the present invention, and FIG. 2B is an explanatory diagram of the configuration of the first structural material. Is. 3 (a) to 3 (d) are views showing cross sections orthogonal to the axial direction (longitudinal direction) of the laminar. FIG. 4 is a perspective view showing a joining structure of the structural material according to the second embodiment of the present invention. FIG. 5A is a cross-sectional view of the first structural material according to the joint structure of the structural material according to the second embodiment of the present invention, and FIG. 5B is an explanatory diagram of the configuration of the first structural material. Is.

Hereinafter, the present invention will be described in detail based on the preferred embodiment thereof.
The joint structure 1 of the structural material of the first embodiment of the present invention is a joint structure 1 of the structural material in which the second structural material 20 is vertically joined to the side surface of the first structural material 10.
The first structural member 10 is a structural square lumber used as a beam of a wooden building, and as shown in FIGS. 1 and 2, four side surfaces a1 to d1 extending along the axial direction Z1 (longitudinal direction) are formed. I have. More specifically, the first structural member 10 has a rectangular cross-sectional shape (more specifically, a rectangular shape) orthogonal to the axial direction Z1, and is used as the four side surfaces a1 to d1 in the vertical direction when used. It includes an upper surface a1 arranged on the upper side of Y, a lower surface c1 arranged on the lower side, and two side surfaces b1 and d1 arranged between the upper and lower surfaces. The first structural member 10 has a first direction X and a second direction Y orthogonal to the first direction X. In the first embodiment, the direction along the horizontal direction in the cross section is the first direction X, and the direction along the vertical direction is the second direction Y.

More specifically, the first structural material 10 has a core portion 11 and is along at least three of the four side surfaces extending along the axial direction Z1 of the first structural material 10. Therefore, a laminar laminated body 12 having a structure in which a plurality of laminas 4 are laminated is formed. More specifically, the lamina laminate 12 is formed along three side surfaces b1 to d1 of the four side surfaces a1 to d1 extending along the axial direction Z1. In the first embodiment, the core portion 11 of the first structural member 10 exists from the center of the cross section to the side surface a1 on which the lamina laminated body 12 is not formed.

The core portion 11 of the first structural member 10 functions as a load support portion, and is alone so as to be safe in terms of structural strength against long-term loads (long-term loads) such as fixed loads and loaded loads. The cross-sectional design is made. Such cross-sectional designs are known. The cross-sectional shape of the core portion 11 which is the load supporting portion is a square shape, and the length of the core portion 11 in the first direction X and the length of the second direction Y in the cross-sectional shape of the first structural member 10 are beams. It can be appropriately changed depending on the shape, size, etc. of In the first embodiment, as shown in FIG. 2, the core portion 11 has a cross-sectional shape in which a laminar laminated body 16 having a plurality of lamina 4 laminated and bonded in the second direction Y is arranged side by side in the first direction X. It has a square shape.

In the first embodiment, the lamina laminate 12 constitutes the first refractory coating layers 13b and 13d described later and the second refractory coating layer 13c described later. The first refractory coating layers 13b and 13d and the second refractory coating layer 13c function as a burn margin layer, and the thicknesses Lb to Ld can be set based on a known burn margin design. Burn margin design is a design method that adds a predetermined burn margin to the cross section required for long-term structural strength and short-term structural strength such as in the event of an earthquake. It is designed to ensure the performance that does not collapse while withstanding the load that supports the building) by the core portion 11 that is the load support portion, and to provide a flaming margin layer with a thickness according to the required fire resistance performance around it. be. For example, a burn margin design is provided with a 45 mm wood coating for 1 hour quasi-fire resistance.

The first structural member 10 has first fireproof coating layers 13b and 13d on both sides of the core portion 11 in the first direction X of the cross section thereof. The first refractory coating layers 13b and 13d are composed of the first lamina laminated bodies 12b and 12d having the second direction Y orthogonal to the first direction X as the laminating direction of the lamina 4. Further, the first structural material 10 has a second fireproof coating layer 13c on one side of the core portion 11 in the second direction. The second refractory coating layer 13c is composed of a second lamina laminated body 12c whose first direction X is the laminating direction of the lamina 4.

The first laminar laminates 12b and 12d constituting the first fireproof coating layers 13b and 13d are made up of a plurality of the first laminar laminates 12b and 12d so that the whole in the second direction Y, which is the lamination direction of the laminar 4, does not have the laminated surfaces of the wood surfaces. The laminar 4 has a laminated structure of the laminar bonded and laminated.
Therefore, when the pair of side surfaces b1 and d1 composed of the first fireproof coating layers 13b and 13d of the first structural material 10 are exposed to the flame at the time of fire, the carbonized layer formed on the side surfaces b1 and d1 is formed. It is also suppressed that large cracks occur along the laminated surfaces of the wood surfaces of Lamina 4 and that a part of the carbonized layer is missing due to such cracks, and the side surfaces b1 and d1 of the first structural material 10 are suppressed. A dense carbonized layer having an excellent effect of suppressing heat conduction or blocking oxygen is formed in the vicinity. As a result, in the first structural material 10, the burn margin layer has a burning stop function even if a flame retardant agent is not blended, and has excellent fire resistance.

In the first embodiment, the first laminar laminates 12b and 12d have a portion existing at the same position as the core portion 11 in the second direction Y and a portion extending from the portion, and the first in the second direction. It extends between both ends of the structural material 10. The second lamina laminated body 12c covers the entire area between the first lamina laminated bodies 12b and 12d.

In the first embodiment, the second structural material 20 is joined to the side surface d1 along the first fireproof coating layer 13d. Like the first structural material 10, the second structural material 20 is a structural square material used as a beam of a wooden building, and as shown in FIG. 1, extends along the axial direction Z2 (longitudinal direction). It has four side surfaces a2 to d2. More specifically, the cross-sectional shape orthogonal to the axial direction Z2 has a square shape (more specifically, a rectangular shape), and is arranged above the vertical direction Y at the time of use as the four side surfaces a2 to d2. It has an upper surface a2, a lower surface c2 arranged on the lower side, and two side surfaces b2 and d2 arranged between the upper and lower surfaces.

More specifically, the second structural material 20 has a core portion 21 and is along at least three of the four side surfaces extending along the axial direction Z2 of the second structural material 20. Therefore, a laminar laminated body 22 having a structure in which a plurality of laminas 4 are laminated is formed. More specifically, the lamina laminate 22 is formed along three side surfaces b2 to d2 of the four side surfaces a2 to d2 extending along the axial direction Z2. In the first embodiment, the core portion 21 of the second structural member 20 exists from the center of the cross section to the side surface a2 on which the lamina laminated body 22 is not formed. The laminar laminated body 22 of the second structural material 20 has a laminated structure of laminar in which a plurality of laminars are laminated and bonded so that the entire laminated body 22 in the laminated direction of the laminar does not have a laminated surface between the lumber surfaces.

In the first embodiment, the core portion 21 of the second structural material 20 functions as a load support portion in the same manner as the core portion 11 of the first structural material 10. Further, in the core portion 21 of the second structural member 20, a laminar laminated body in which a plurality of laminars are laminated and adhered in the second direction Y can be arranged side by side in the first direction X to form a square cross-sectional shape.
The lamina laminate 22 of the second structural material 20 functions as a burnout layer, similarly to the lamina laminate 12 constituting the first and second refractory coating layers 13b to 13d of the first structural material 10.

In the first structural material 10 and the second structural material 20 of the first embodiment, the lamina 4 constituting the lamina laminates 12 and 22 is all laminar having a wood surface 5 and a wood back 6. FIG. 3 is a view showing a cross section orthogonal to the axial direction (longitudinal direction) of the laminar, and the lamina 4 shown in FIGS. 3 (a) and 3 (b) is a laminar having a wood surface 5 and a wood back 6. Is. The surface 5 of the Lamina tree is the surface of the two opposite surfaces that is farther from the core 7 of the log, and the back 6 of the Lamina is the surface of the two surfaces that is closer to the core 7 of the log. This is the direction. The lamina 4 shown in FIGS. 3 (c) and 3 (d) is a lamina in which the wood surface 5 and the wood back 6 are indistinguishable on two opposite surfaces having a wide width, and are included in the lamina laminated bodies 12 and 22. This is an example of Lamina that you may have. From the viewpoint of quality control in the manufacture of structural materials, in the lamina laminates 12 and 22 that function as a burnout layer, more than two-thirds of the laminated lamina is a lamina with a distinction between wood surface 5 and wood back 6. It is preferable that there are three-quarters or more of the lamina having a distinction between the wood surface 5 and the wood back 6, and the lamina laminate 12 is like the first structural material 10 and the second structural material 20. It is more preferable that all the laminas constituting the, 22 are laminas having a distinction between the wood surface 5 and the wood back 6. In the first structural material 10 and the second structural material 20, all the laminars constituting the laminar laminates 12 and 22 and the core portions 11 and 21 are laminars in which the wood surface 5 and the wood back 6 are distinguished. It has become. Further, in FIG. 3, reference numeral 7 indicates the position of the tree core 7 of the log, and reference numeral 41 indicates an annual ring.

In addition, the present inventors have changed the state of the annual ring of the laminated lumber of the laminated lumber in order to develop a fire-resistant wooden structural material having a high fire-resistant performance while the combustion margin layer is composed of a laminated body of the lamina. As a result of research on the performance, when the laminated lumber provided with the burn margin layer by arranging the lamina laminate so that the direction along the circumferential direction of the cross section is the stacking direction, the burn margin layer burns. It was found that the carbonized layer to be formed cracked along the lamina's annual ring (more specifically, the early lumber part of the annual ring), and combustion along the crack easily proceeded to the inside of the fireproof wooden structural material. .. Based on such findings, it has been found that the fire resistance performance of the joint portion can be improved by setting the orientation of the laminar constituting the lamina laminate in a predetermined direction at the joint portion between the structural materials.

In the first embodiment, as shown in FIG. 1, the second structural material 20 is along the first fireproof coating layer 13d of the pair of first fireproof coating layers 13b and 13d of the first structural material 10. It is joined to the side surface d1. In the present specification, the first lamina laminate 12d forming the first refractory coating layer 13d to which the second structural material 20 is bonded is referred to as "specific first lamina laminate 12d". The specific first laminar laminate 12d in the first structural member 10 extends from the position of the edge 20a of the second structural member 20 in the one-way Y1 in one direction Y1 parallel to the second direction Y. Has 14. In each of the laminars 4e constituting the extension portion 14, the wood surface 5 side faces the outside of the extension direction Y1 of the extension portion 14.
The extension portion 14 of the specific first lamina laminate 12d forming the first fire-resistant coating layer 13d to which the second structural member 20 is joined has the wood surface 5 side outside the extension direction Y1 of the extension portion 14. Even if a fire breaks out due to the composition of the facing Lamina 4e and the extending portion 14 of the specified first Lamina laminated body 12d is exposed to the flame and the combustion proceeds along the annual ring of the Lamina 4. Since the main traveling direction in which combustion proceeds tends to be away from the second structural material 20, it is possible to prevent combustion from proceeding so as to wrap around the end surface of the first structural material 10 on the second structural material 20. become. Thereby, according to the joint structure of the first embodiment, it is possible to improve the fire resistance performance at the joint portion between the structural materials while suppressing the complication of the structure.
In the first embodiment, the one-way Y parallel to the second direction Y is downward in the vertical direction.

In the first embodiment, the specific first lamina laminated body 12d has only one laminated surface 8 between the wooden backs 6. Instead of this, it is also preferable that all the wood surface 5 of the lamina 4 constituting the specific first lamina laminated body 12d face the same direction in the lamina stacking direction Y. The embodiment having only one laminated surface 8 between the wooden backs 6 suppresses the warp of the first structural material 10 as a whole as compared with the embodiment having no laminated surface 8 between the wooden backs 6. Preferred from the point of view.

Further, from the same viewpoint, the laminated surface 8 of the wooden backs 6 is at the same position as the core portion 11 in the lamina stacking direction Y of the specific first lamina laminated body 12d as in the first embodiment shown in FIG. It is preferably present in the portion located in. For example, the laminated surface 8 of the wood backs 6 divides the first structural material 10 into three equal parts in the same direction as the lamina stacking direction Y of the lamina laminated body 13 forming the specific first lamina laminated body 12d, and has three regions. It is preferable that it exists in the central region when it is divided into.

In the first embodiment, the laminated surface 8 of the wood backs 6 of the specified first lamina laminated body 12d is located at the same position as the core portion 11 in the lamina stacking direction Y of the specified first lamina laminated body 12d. In the specific first lamina laminated body 12d, all of the lamina 4 located outside the one-way Y1 parallel to the second direction Y with respect to the core portion 21 of the second structural material 20 are on the wood surface 5 side. It is a laminar 4 facing outward in the extension direction Y1 of the extension portion 14. That is, in the specific first laminar laminate 12d, all of the laminars 4 located outside the Y1 direction of the core portion 21 of the second structural member 20 in the Y1 direction extend on the wood surface 5 side. It is a laminar 4 facing outward in the extending direction Y1 of the protruding portion 14.
With such a configuration, even if a fire occurs and the specified first lamina laminate 12d is exposed to flame and combustion proceeds along the annual ring of lamina 4, the main traveling direction in which combustion proceeds is the second structure. Since the direction tends to be away from the core portion 21 of the material 20, it is possible to prevent combustion from proceeding so as to wrap around the end surface of the first structural material 10 side of the core portion 21 of the second structural material 20. Thereby, according to the joint structure of the structural materials of the first embodiment, the fire resistance performance at the joint portion between the structural materials can be further effectively improved.

The lamina 4 constituting the lamina laminates 12 and 22 of the first structural material 10 and the second structural material 20 of the first embodiment is made of wood of the same tree species. However, as Lamina 4, 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. As the wood species used as the raw material of Lamina 4, any tree can be used. For example, in the case of coniferous trees, larch, Douglas-fir, Larix kaempferi, hemlock, etc. Can be used. Further, each laminar 4 has a long shape in the same direction as the longitudinal direction (same as the axial directions Z1 and Z2) of the first structural member 10 and the second structural member 20. The individual lamina 4 may be a single sawn board or the like continuous over the entire length of the first structural material 10 and the second structural material 20 in the longitudinal direction, but all or part of the lamina may be a plurality of pieces. A sawn board or the like may be joined in the longitudinal direction by a joining method such as a finger joint.

The thickness of the laminar 4 constituting the laminar laminates 12 and 22 of the first structural material 10 and the second structural material 20 is preferably 50 mm or less, more preferably 35 mm or less, still more preferably 20 mm or less. The lower limit of the thickness of the lamina 4 is preferably 5 mm or more, more preferably 8 mm or more. The width of the lamina 4 is not less than or equal to the thickness, preferably 2 times or more and 50 times or less the thickness, and more preferably 3 times or more and 10 times or less the thickness.

The laminar laminates 12, 22 and 16 in the first structural material 10, the second structural material 20 and the core portion 11 of the first embodiment are laminated in a state where the laminars contained therein are bonded to each other by an adhesive. And the adjacent lamina laminates are also joined by an adhesive.
As the adhesive for joining the lamina to each other or between the lamina laminates, various known adhesives conventionally used in the production of laminated materials can be used, for example, an aqueous polymer-isocyanate adhesive and resorcinol. Examples thereof include resin adhesives, resorcinol / phenol resin adhesives, melamine resin adhesives, melamine urea resin adhesives, urethane resin adhesives, epoxy resin adhesives and the like. Among these, resorcinol resin adhesive or resorcinol / phenol resin adhesive is preferable.

In the first structural material 10 and the second structural material 20, for example, an adhesive is arranged between the laminas and pressure is applied to laminate and press the layers to produce each lamina laminate, and then the adhesive is arranged between the lamina laminates. The lamina laminate can be produced by laminating and pressurizing, but the present invention is not limited thereto, and each can be produced by an arbitrary procedure.

In order to join the second structural material 20 to the side surface d1 along the first fireproof coating layer 13d of the first structural material 10, for example, a cutout is made in the specific first lamina laminate 12d constituting the first fireproof coating layer 13d. A portion may be formed, a part of the second structural material 20 may be inserted into the notch portion, and the second structural material 20 may be joined to the side surface d1 of the first structural material 10. Further, the second structural material 20 is used as the first structural material 10 by using nails, metal fittings, or the like without forming a notch for inserting a part of the second structural material in the specific first lamina laminated body 12d. It can also be joined to the side surface d1 of.

FIG. 4 shows a joint structure 1A of the structural material according to the second embodiment of the present invention. The point not particularly described about the joint structure 1A of the structural material of the second embodiment is the same as that of the joint structure 1 of the structural material of the first embodiment, and the description of the first embodiment is appropriately applied.
In the second embodiment, the first structural material 10A is a structural square material used as a pillar of a wooden building. In the first structural material 10A, the axial direction Z1 is in the direction along the vertical direction. As shown in FIG. 4, the first structural member 10A includes four side surfaces a1 to d1 extending along the axial direction Z1 (longitudinal direction), as in the first embodiment. The first structural member 10 has a first direction X and a second direction Y orthogonal to the first direction X in a cross section orthogonal to the axial direction Z2.

To elaborate on the first structural material 10A, as shown in FIGS. 4 and 5, the first structural material 10A has a core portion 11A and is along four side surfaces a1 to d1 extending along the axial direction Z2. The lamina laminate 12 is formed. In the second embodiment, the lamina laminate 12 has the first refractory coating layers 13b and 13d located on both sides of the core portion 11A in the first direction X of the cross section of the first structural material 10A, and both sides of the second direction Y. It constitutes the second fireproof coating layer 13a, 13c located in. The second fireproof coating layer 13a functions as a burnout layer like the first fireproof coating layers 13b and 13d and the second fireproof coating layer 13c, and its thickness La is the first fireproof coating layers 13b and 13d. And, similarly to the second fireproof coating layer 13c, it can be set based on a known burn margin design.

In the first structural material 10A of the second embodiment, as in the first embodiment, the first refractory coating layers 13b and 13d have the second direction Y orthogonal to the first direction X as the stacking direction of the laminar 4. It is composed of the first lamina laminates 12b and 12d. The second refractory coating layers 13a and 13c of the first structural material 10A are composed of the second lamina laminated bodies 12a and 12c having the first direction X as the laminating direction of the lamina 4. The second structural material 20 is joined to the side surface d1 along the first fireproof coating layer 13d of the first structural material 10A.

Also in the second embodiment, as in the first embodiment, the specific first lamina laminate 12d, which is the first lamina laminate 12d forming the first fireproof coating layer 13d to which the second structural material 20 is bonded, is In one direction Y1 parallel to the second direction Y, the extension portion 14 extends from the position of the edge 20a of the second structural member 20 in the one direction Y1 and constitutes the extension portion 14. In each of the laminars 4, the wood surface 5 side faces the outside of the extension direction Y1 of the extension portion 14. Further, also in the second embodiment, as in the first embodiment, all of the laminars 4 located outside the one-way Y1 parallel to the second direction Y from the core portion 21 of the second structural material 20 are made of wood. The table 5 side is the laminar 4 facing outward in the extension direction Y1 of the extension portion 14. By having these configurations, the same effect as that of the first embodiment can be obtained even in the joint structure 1A of the structural material of the second embodiment in which the first structural material 10A is a pillar material.

It is preferable that the first and second structural materials in the present invention have a fire resistance of at least 1 hour on any of the three sides or the four sides having a burnout layer. For example, the thickness of the lamina laminates 12 and 22 forming the burn margin layer surrounding the cores 11, 11A and 21 on three or four sides is 50 mm or more from the viewpoint of improving the fire resistance performance, especially the burning stop function. Is preferable, 60 mm or more is more preferable, and 70 mm or more is further preferable. From the same viewpoint, the lamina laminates 12 and 22 forming the combustion margin layer surrounding the cores 11, 11A and 21 on three or four sides are heated by the ISO834 standard heating curve for 1 hour and then for 5 hours, respectively. Combustion that does not reach the position where the depth from the surface forming the 3rd or 4th side surface of the 1st or 2nd structural material is 70mm, preferably 60mm, more preferably 50mm when it is allowed to cool. It is preferable to have a staying performance.

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, in the first and second embodiments, the second structural material 20 is joined only to the side surface d1 on one side of the first structural material 10, 10A in the first direction X, but the second structural material 20 is the first. It may be joined to the side surfaces b1 and d1 on both sides of the structural materials 10 and 10A in the first direction X. When the second structural material 20 is joined to the side surfaces b1 and d1 on both sides of the first structural material 10 and 10A in the first direction X, the side surfaces b1 and d1 on both sides to which the second structural material 20 is joined are formed. The first lamina laminates 12b and 12d may have the same configuration as the above-mentioned specific first lamina laminate.
Further, in the first and second embodiments, in the second lamina laminated bodies 12a and 12c, the first direction X is the laminating direction of the lamina 4, but the second direction Y may be the laminating direction of the lamina 4.
Further, in the first and second embodiments, the core portions 11 and 11A are the laminar laminated bodies having the first direction Y as the laminating direction of the lamina 4, similarly to the first lamina laminated bodies 12b and 12d located around the core portions 11 and 11A. The cores 11 and 11A are made of solid material, a lamina laminate having no laminated surface between wood surfaces, a lamina laminate having a laminated surface between wood surfaces, and first fireproof coating layers 13b and 13d. It is also possible to configure the first lamina laminated body 12b, 12d from the lamina laminated body or the like in which the direction orthogonal to the lamina laminating direction of the first lamina laminated body 12b, 12d is the lamina laminating direction.
Further, the first structural material and the second structural material in the present invention may be a pillar material having a rectangular cross-sectional shape or a beam material having a square cross-sectional shape.

1,1A Joint structure of structural material 10,10A 1st structural material 11 Core of 1st structural material 12b, 12d 1st lamina laminate 12a, 12c 2nd lamina laminate 13b, 13d 1st fireproof coating layer 13a, 13c 2nd fireproof coating layer 14 Extension part 20 2nd structural material 20a Edge edge of 2nd structural material 21 Core part of 2nd structural material 22 Lamina laminated body of 2nd structural material 4 Lamina 5 Wood surface 6 Wood back

Claims (7)

It is a joint structure of a structural material in which a second structural material is vertically joined to the side surface of the first structural material.
The first structural material and the second structural material are square lumbers, respectively, and have a structure in which three or four sides around the core portion are surrounded by a lamina laminated body having a structure in which a plurality of lamina are laminated. ,
The first structural material is a first fireproof coating layer composed of a first lamina laminated body having a second direction orthogonal to the first direction as a laminating direction of the lamina on both sides of the core portion in the first direction of the cross section thereof. On one side or both sides of the core portion in the second direction of the cross section, a second fireproof coating layer made of a second laminar laminated body having the first direction or the second direction as the lamina laminating direction is provided. And
The second structural material is joined to the side surface along the first fireproof coating layer, and the specific first lamina laminate forming the first fireproof coating layer along the side surface is in one direction parallel to the orthogonal direction. Each of the laminas having an extending portion extending from the position of the edge of the second structural material in the one direction and constituting the extending portion has a wood surface and a wood back, and the wood front side has a wood front side. A joint structure of structural materials, which is a laminar facing outward in the extension direction of the extension portion. In the specific first lamina laminated body, all of the lamina located outside the core portion of the second structural material in one direction have a wood surface and a wood back, and the wood front side is the extending portion. The joint structure of the structural material according to claim 1, which is a laminar facing outward in the extending direction. The structure according to claim 1 or 2, wherein the specific first lamina laminated body has a structure in which a plurality of lamina having a wood surface and a wood back are laminated and bonded so as not to have a laminated surface between the wood surfaces. Joint structure of materials. The joint structure of the structural material according to any one of claims 1 to 3, wherein a notch portion into which a part of the second structural material is inserted is not formed in the specific first lamina laminated body. 6. Joint structure of structural materials. The first structural material and the second structural material are beams of a wooden building,
The first direction of the cross section of the first structural member is along the horizontal direction, the second direction of the first structural member is along the vertical direction, and the one direction which is the extension direction of the extension portion is the vertical direction. The joint structure of the structural material according to any one of claims 1 to 5, which is a downward direction. A building having a joint structure of the structural material according to any one of claims 1 to 6.

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