Joint structure between structural members

Abstract

To provide a joint structure between structural members that simplifies processing while ensuring fire resistance and allows easy construction.SOLUTION: A joint structure 100 between structural members is arranged such that a first joint surface 2a of a first structural member 2 faces a second joint surface 1a of a second structural member 1. The first structural member 2 and the second structural member 1 each comprise: load supporting portions 11, 21 that support loads and include a wooden material; fire-retardant layers 12, 22 placed outside the load supporting portions 11, 21 and having higher fire resistance than the load supporting portions 11, 21; and surface layers 13, 23 placed outside the fire-retardant layers 12, 22. The fire-retardant layer 22 of the first structural member 2 is placed on the first joint surface 2a, and the surface layer 13 of the second structural member 1 is placed on the second joint surface 1a. A fire-resistant expansion material 18 is placed on at least a part of one of the first joint surface 2a and the second joint surface 1a.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a joining structure between structural materials. [Background technology]

[0002] At the joints between fire-resistant wooden components such as columns and beams, which are made of wood, it was necessary to prevent the combustion of important load-bearing parts that support the load until the fire is over.If gaps were to occur at the joints due to design or construction, there was a concern that the gaps could burn into the load-bearing parts, so additional fire-resistant measures were required, such as filling the gaps with inorganic coating materials and then covering them with wood to improve the design.

[0003] The following Patent Document 1 proposes a method for joining a column and a beam, which have a surface burnable layer and a fire-retardant layer placed inside the surface layer, in which a recess is formed so that the fire-retardant layer of the column is exposed, and the end face of the fire-retardant layer of the beam is abutted against the exposed fire-retardant layer of the column. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 4848213 Summary of the Invention [Problem to be solved by the invention]

[0005] However, the joining method of Patent Document 1 has the problem that the processing is complicated and time-consuming because the fire-retardant layer of the pillar is exposed.

[0006] Therefore, the present invention has been made in consideration of the above circumstances, and provides a joining structure between structural materials that can be easily constructed and that can be processed simply while ensuring fire resistance. [Means for solving the problem]

[0007] In order to achieve the above object, the present invention employs the following means. In other words, the joining structure between structural materials according to the present invention is a joining structure between structural materials arranged so that a first joining surface of a first structural material faces a second joining surface of a second structural material, and the first structural material and the second structural material each have a load-bearing portion that supports a load and includes wood, a fire-retardant layer that is arranged outside the load-bearing portion and has higher fire resistance than the load-bearing portion, and a surface layer that is arranged outside the fire-retardant layer, the fire-retardant layer of the first structural material is arranged on the first joining surface, the surface layer of the second structural material is arranged on the second joining surface, and a fire-resistant expansion material is arranged on a portion of at least one of the first joining surface and the second joining surface.

[0008] In a joining structure between structural materials configured in this manner, a fire-retardant layer of the first structural material is disposed on the first joining surface of the first structural material. A surface layer of the second structural material is disposed on the second joining surface of the second structural material. A fire-resistant expansion material is disposed on a portion of at least one of the first joining surface and the second joining surface. In the event of a fire, the fire-resistant expansion material expands and seals the gap between the first joining surface of the first structural material and the second joining surface of the second structural material, thereby providing a heat shielding effect and preventing the load-bearing portion from being exposed to external heat and catching fire, thereby ensuring fire resistance. Furthermore, since the fire-resistant expansion material only needs to be placed on the fire-retardant layer of the first joint surface of the first structural material and on at least a portion of the surface layer of the second joint surface of the second structural material, processing is simplified and installation is easy.

[0009] In addition, the joining structure between structural materials according to the present invention may have a groove portion formed in the surface layer of the second joining surface that is recessed in a direction away from the first joining surface, and the fire-resistant expansion material may be arranged in the groove portion.

[0010] In the joining structure between structural members configured in this manner, a groove is formed in the surface layer of the second joining surface of the second structural member, and a fire-resistant expansion material is placed in the groove. Therefore, when one of the first structural member and the second structural member is moved downward to install the other of the first structural member and the second structural member, the fire-resistant expansion material is prevented from contacting the first joining surface of the first structural member and sliding down.

[0011] In addition, the joining structure between structural materials according to the present invention may have a groove formed in the fire-retardant layer of the first joining surface that is recessed in a direction away from the second joining surface, and the fire-resistant expansion material may be arranged in the groove.

[0012] In this joint structure between structural members, a groove is formed in the fire-retardant layer on the first joint surface of the first structural member, and a fire-resistant expansion material is placed in the groove. Therefore, when one of the first structural member and the second structural member is moved downward to install the other of the first structural member and the second structural member, the fire-resistant expansion material is prevented from coming into contact with the second joint surface of the second structural member and sliding down.

[0013] In the joint structure between structural materials according to the present invention, the first structural material may be a beam, and the second structural material may be a pillar.

[0014] In a joint structure between structural materials configured in this manner, in the event of a fire, the fire-resistant expansion material expands at the joint between the column and the beam, sealing the gap between the first joint surface of the beam and the second joint surface of the column, thereby ensuring fire resistance. Furthermore, the fire-resistant expansion material can be easily installed because it only needs to be placed on the fire-retardant layer of the first joint surface of the beam and on at least a part of the surface layer of the second joint surface of the column.

[0015] Furthermore, in the joining structure for joining structural materials according to the present invention, the second joining surface may be provided with a fitting portion that protrudes toward the first structural material and that fits the first joining surface in a countersunk manner.

[0016] In a joining structure between structural materials configured in this manner, the second joining surface of the second structural material is provided with a fitting portion that protrudes toward the first structural material and is countersunk into the first joining surface of the first structural material. Therefore, because the fitting portion provided on the second joining surface of the second structural material is countersunk into the first joining surface of the first structural material, flames are prevented from leaking sideways from between the first joining surface of the first structural material and the second joining surface of the second structural material. [Effects of the Invention]

[0017] According to the joining structure between structural members of the present invention, processing can be simplified while ensuring fire resistance, and construction can be easily performed. [Brief explanation of the drawings]

[0018] [Figure 1] 1 is an exploded perspective view of a joining structure between structural materials according to a first embodiment of the present invention; [Figure 2] 1 is a horizontal cross-sectional view of a joining structure between structural materials according to a first embodiment of the present invention. [Figure 3] FIG. 3 is an enlarged view of part III in FIG. 2. [Figure 4] FIG. 3 is an enlarged view of part IV in FIG. 2. [Figure 5] FIG. 4 is a horizontal cross-sectional view of a joining structure between structural materials according to a second embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0019] (First embodiment) A joining structure between structural materials according to a first embodiment of the present invention will be described with reference to the drawings. Fig. 1 is an exploded perspective view of a joining structure between structural members according to a first embodiment of the present invention, and Fig. 2 is a horizontal cross-sectional view of the joining structure between structural members according to the first embodiment of the present invention. As shown in Figures 1 and 2, a joining structure between a pillar and a beam (hereinafter simply referred to as "joint structure") 100 will be described as an example of a joining structure between structural materials. The joining structure 100 is arranged so that a joining surface (second joining surface) 1a of the pillar (second structural material) 1 faces a joining surface (first joining surface) 2a of the beam (first structural material) 2, thereby joining the pillar 1 and the beam 2. As shown in Figure 2, in this embodiment, three beams 2 are joined to one pillar 1. It is sufficient that one or more beams 2 are joined to one pillar 1.

[0020] As shown in Figure 2, the two beams 2 arranged on both sides of the column 1 are called beams 2A and 2B. The other beam joined to the column 1 is called beam 2C. The length direction in the horizontal direction in which beam 2C extends is called first direction X. The length direction in the horizontal direction in which beams 2A and 2B extend is called second direction Y. The direction perpendicular to the first direction X and second direction Y is called vertical direction Z.

[0021] Among the joint structures 100, the joint structure 100 between the column 1 and the beam 2A will be referred to as joint structure 100A. Among the joint structures 100, the joint structure 100 between the column 1 and the beam 2B will be referred to as joint structure 100B. Among the joint structures 100, the joint structure 100 between the column 1 and the beam 2C will be referred to as joint structure 100C.

[0022] First, the configuration of the pillar 1 and the beam 2 will be described. The pillar 1 comprises a load-bearing portion 11, a fire-retardant layer 12, and a surface layer 13.

[0023] The load support portion 11 is made of materials including wood. The load support portion 11 has the function of supporting a load. The load support portion 11 alone has structural strength against long-term loads (long-term loads) such as fixed loads, live loads, and snow loads. The horizontal cross-sectional shape of the load support portion 11 is approximately rectangular. The horizontal cross-sectional shape of the load support portion 11 can be set as appropriate.

[0024] Beam support hardware 16 is fixed to three surfaces of the load support portion 11 facing the beam 2 at three locations.

[0025] As shown in FIG. 1, the beam support hardware 16 has a fixing plate portion 16a, a connecting plate portion 16b, and a support plate portion 16c. The fixing plate portion 16a is fixed to the surface of the load support portion 11 facing the beam 2. The fixing plate portion 16a is formed in a plate shape. The plate surface of the fixing plate portion 16a faces the length direction of the opposing beam 2. The connecting plate portion 16b extends from the middle of the fixing plate portion 16a in the width direction toward the beam 2. The connecting plate portion 16b is formed in a plate shape. The plate surface of the connecting plate portion 16b faces the width direction of the beam 2. The support plate portion 16c extends from the lower end of the fixing plate portion 16a toward the beam 2. The support plate portion 16c is formed in a plate shape. The plate surface of the support plate portion 16c faces the vertical direction Z. The lower end of the connecting plate portion 16b is connected to the support plate portion 16c.

[0026] The fire-retardant layer 12 is arranged on the outside of the four sides of the load-bearing portion 11. The fire-retardant layer 12 is made of a material that is more fire-resistant than the load-bearing portion 11. For example, the fire-retardant layer 12 is made by injecting a fire-retardant agent into wood. The material of the fire-retardant layer 12 can be appropriately selected as long as it is more fire-resistant than the load-bearing portion 11. The fire-retardant layer 12 is arranged in a position that avoids the beam support hardware 16.

[0027] A "flame retardant agent" is an agent having flame retardancy. Examples of the flame retardant agent include phosphorus-based compounds, boron-based compounds, etc. Examples of phosphorus-based compounds include organic phosphorus compounds, phosphoric acid, phosphate esters, phosphate salts, etc., and specific examples thereof include diammonium hydrogen phosphate, ammonium dihydrogen phosphate, diguanidine phosphate, ammonium polyphosphate, hydrophobized ammonium polyphosphate, guanylurea phosphate, etc. Examples of boron-based compounds include organic boron compounds, boric acid, borax, boron oxide, borate esters, borates, etc. Examples of compounds other than phosphorus-based compounds and boron-based compounds include ammonium sulfate and zinc chloride. Among these, one or more selected from the group consisting of organic phosphorus compounds, phosphoric acid, phosphate esters, phosphate salts, organic boron compounds, boric acid, borate esters, and borates are preferred.

[0028] Examples of "highly fire-resistant materials" that can be used include gypsum board, waterproof gypsum board, calcium silicate board, ALC board, wood chip cement board, wood wool cement board, ceramic siding, mortar, etc.

[0029] The surface layer 13 is arranged on the outside of the fire-retardant layer 12. The surface layer 13 is made of a material containing wood. The surface layer 13 is located on the four surfaces of the pillar 1. In the event of a fire, the surface layer 13 is the part that will carbonize while the fire continues, and the fire-retardant layer 12 arranged inside the surface layer 13 prevents the progression of carbonization due to subsequent self-combustion, thereby stopping the fire. The surface layer 13 may also be wood that has been injected with a fire-retardant agent.

[0030] Each beam 2 includes a load-bearing portion 21, a fire-retardant layer 22, and a surface layer 23.

[0031] The load support portion 21 is made of materials including wood. The load support portion 21 has the function of supporting a load. The load support portion 21 alone has structural strength against loads (long-term loads) that occur over a long period of time, such as fixed loads, live loads, and snow loads. The vertical cross-sectional shape of the load support portion 21 is approximately rectangular. The vertical cross-sectional shape of the load support portion 21 can be set as appropriate.

[0032] An inwardly recessed slit 21b is formed in the end surface of the load support portion 21 facing the column 1. A joint plate portion 16b of the beam support hardware 16 is inserted into the slit 21b.

[0033] The fire-retardant layer 22 is disposed on the outer side of both widthwise sides of the beam 2 in the load-bearing portion 21. The fire-retardant layer 22 is made of a material that is more fire-resistant than the load-bearing portion 21. For example, the fire-retardant layer 22 is made by injecting a fire-retardant agent into wood. The material of the fire-retardant layer 22 can be appropriately selected as long as it is more fire-resistant than the load-bearing portion 21.

[0034] The surface layer 23 is arranged on the outer side of the fire-retardant layer 22 in the width direction of the beam 2. The surface layer 23 is made of a material containing wood. The surface layer 23 is located on the surface of the beam 2. In the event of a fire, the surface layer 23 is the part that will carbonize while the fire continues, and the fire-retardant layer 22 arranged inside the surface layer 23 prevents the progression of carbonization due to subsequent self-combustion, thereby stopping the fire. The surface layer 23 may also be wood that has been injected with a fire-retardant agent.

[0035] Fixing devices such as screws and nails (not shown) are inserted into mounting holes 23h formed in the surface layer 23 and fastened to mounting holes 16h in the connecting plate portion 16b of the beam support hardware 16 of the column 1.

[0036] As shown in FIG. 2, at the longitudinal end of the beam 2, the end face 21a of the load-bearing portion 21 protrudes toward the column 1 beyond the end face 22a of the fire-retardant layer 22 and the end face 23a of the surface layer 23.

[0037] Next, the configuration of the junction structure 100 will be described. Surface layers 13 are arranged on both sides of the joint surface 1a of the column 1 in the width direction of the column 1. In other words, the fire-retardant layer 12 is not exposed on the joint surface 1a of the column 1, but is covered with the surface layers 13. Between the surface layers 13 on both sides of the column 1 in the width direction, a portion including the end face 21a of the load-bearing portion 21 of the beam 2 is arranged to protrude toward the column 1 side.

[0038] At the joint surface 2a of the beam 2, an end surface 22a of the fire-retardant layer 22 is exposed.

[0039] FIG. 3 is an enlarged view of part III in FIG. As shown in Figure 3, there is a small gap S between the joint surface 1a of the column 1 and the joint surface 2a of the beam 2. The gap S is provided to absorb construction errors, but the joint surface 1a of the column 1 and the joint surface 2a of the beam 2 may be in contact with each other without providing the gap S.

[0040] At the joint surface 2a of the beam 2, the end surface 22a of the fire-retardant layer 22 and the end surface 23a of the surface layer 23 are exposed.

[0041] At the joint surface 1a of the column 1, the surface layer 13 arranged outside the fire-retardant layer 12 is exposed. A groove 17 is formed on the surface 13b of the surface layer 13 facing the beam 2, recessing in a direction away from the joint surface 2a of the beam 2. The groove 17 is formed on the surface 13b of the surface layer 13 in at least a portion of the width direction of the column 1. As shown in FIG. 1, the groove 17 reaches the bottom of the beam 2. The groove 17 is formed in an upward U-shape so as to follow the joint surface 2a of the beam 2.

[0042] As shown in FIG. 3, a fire-resistant expansive material 18 is arranged in the groove 17. The fire-resistant expansive material 18 is arranged over substantially the entire length of the groove 17. The fire-resistant expansive material 18 is formed in a plate shape. The plate surface of the fire-resistant expansive material 18 faces the direction in which the joint surface 1a and the joint surface 2a face each other. The fire-resistant expansive material 18 is arranged so as to face the end surface 22a of the fire-retardant layer 22 of the beam 2.

[0043] A foamed fireproof tape, a foamed fireproof sheet, etc. can be used as the fireproof expanding material 18. Among these, it is preferable to use a foamed fireproof tape from the viewpoint of easy application in a short time. The intumescent fire-resistant tape and intumescent fire-resistant sheet each foam when exposed to heat to form a heat insulating layer. The intumescent fire-resistant tape and intumescent fire-resistant sheet each contain a resin as a main constituent material. Examples of the resin that is the main constituent material of the intumescent fire-resistant tape and intumescent fire-resistant sheet include butyl rubber, epoxy resin, and vinyl chloride resin. The intumescent fire-resistant sheet can be fixed to the groove using, for example, an adhesive or staples. The fire-resistant expansion material 18 is generally an organic heat insulating material, which is a heat insulating material whose main component is an organic compound.

[0044] In the event of a fire, the fire-resistant expansion material 18 expands and seals the gap S between the joint surface 1a of the column 1 and the joint surface 2a of the beam 2. Even if there is no gap S between the joint surface 1a of the column 1 and the joint surface 2a of the beam 2, the fire-resistant expansion material 18 expands and seals the gap between the joint surface 1a of the column 1 and the joint surface 2a of the beam 2 in the event of a fire.

[0045] As shown in Figure 2, in the joint structure 100A between a column 1 and a beam 2A and the joint structure 100B between a column 1 and a beam 2B, the groove portion 17 is formed at a position away from the load-bearing portion 21 in the thickness direction of the fire-retardant layer 22 of the beam 2.

[0046] In joint structure 100C between column 1 and beam 2C, groove 17 is formed in a position closer to load-bearing portion 21 in the thickness direction of fire-retardant layer 22 of beam 2. Fire-resistant expansion material 18 is disposed in groove 17. In joint structures 100A, 100B, and 100C, groove 17 may be formed in a position facing fire-retardant layer 22 of beam 2.

[0047] FIG. 4 is an enlarged view of part IV in FIG. As shown in FIG. 4, at the joint surface 2a of the beam 2, the end surface 22a of the fire-retardant layer 22 and the end surface 23a of the surface layer 23 are exposed.

[0048] At the joint surface 1a of the column 1, a surface layer 13 arranged outside the fire-retardant layer 12 is exposed. The surface layer 13 has a surface layer facing portion 13c that faces the joint surface 2a of the beam 2, and a fitting portion 13d that is arranged to the side of the surface layer facing portion 13c. The surface layer facing portion 13c is arranged with a gap S between it and the joint surface 2a of the beam 2. The fitting portion 13d protrudes toward the beam 2 side more than the surface layer facing portion 13c. The fitting portion 13d abuts against the side surface 23d of the surface layer 23 of the beam 2, forming a countersunk fit.

[0049] A groove 17 is formed on the surface 13b of the surface layer facing portion 13c of the surface layer 13, facing the beam 2, and recessed in a direction away from the joint surface 2a of the beam 2. The groove 17 reaches the lower part of the beam 2. The groove 17 is formed in an upward U-shape so as to follow the joint surface 2a of the beam 2.

[0050] A fire-resistant expansion material 18 is arranged in the groove portion 17. The fire-resistant expansion material 18 is formed in a plate shape. The plate surface of the fire-resistant expansion material 18 faces the direction in which the joint surface 1a and the joint surface 2a face each other. The fire-resistant expansion material 18 is arranged so as to face the end surface 22a of the fire-retardant layer 22 of the beam 2. In the event of a fire, the fire-resistant expansion material 18 expands and seals the gap S between the joint surface 1a of the column 1 and the joint surface 2a of the beam 2. Since the fitting portion 13d of the surface layer 13 is countersunk into the side surface 23d of the surface layer 23 of the beam 2, the leakage of flames to the side through the gap S is suppressed.

[0051] In the joint structures 100A, 100B, and 100C configured in this manner, a fire-retardant layer 22 of the beam 2 is disposed on the joint surface 2a of the beam 2. A surface layer 13 of the column 1 is disposed on the joint surface 1a of the column 1. A fire-resistant expansion material 18 is disposed on the joint surface 1a of the column 1. In the event of a fire, the fire-resistant expansion material 18 expands and seals the gap S between the joint surface 2a of the beam 2 and the joint surface 1a of the column 1, thereby providing a heat shielding effect and preventing the load-bearing parts 11 and 21 from being exposed to external heat and catching fire, thereby ensuring fire resistance.

[0052] Furthermore, since the fireproof expansion material 18 only needs to be placed on the surface layer 13 of the joint surface 1a of the column 1, processing can be simplified and construction can be easily performed.

[0053] In addition, grooves 17 are formed in the surface layer 13 of the joint surface 1a of the column 1, and fire-resistant expansion material 18 is arranged in the grooves 17. Therefore, when the beam 2 is moved downward relative to the column 1 and installed, the fire-resistant expansion material 18 is prevented from coming into contact with the joint surface 2a of the beam 2 and sliding down.

[0054] In addition, a fitting portion 13d is provided on the joint surface 1a of the column 1, protruding toward the beam 2 and fitting with the joint surface 2a of the beam 2. Because the fitting portion 13d provided on the joint surface 1a of the column 1 is fitted with the joint surface 2a of the beam 2, the leakage of flames to the side from between the joint surface 2a of the beam 2 and the joint surface 1a of the column 1 is suppressed.

[0055] Second Embodiment Next, a joining structure between structural members according to a second embodiment of the present invention will be described mainly with reference to Fig. 5. In the following description of the modified example, the same or similar members and parts as those in the above-described embodiment will be designated by the same reference numerals, and their description will be omitted, and only configurations different from the embodiment will be described.

[0056] FIG. 5 is a horizontal cross-sectional view of a joining structure between structural members according to a second embodiment of the present invention. 5, among the joint structures 100, the joint structure 100 with the beam 2A is referred to as joint structure 100D. Among the joint structures 100, the joint structure 100 with the beam 2B is referred to as joint structure 100E. Among the joint structures 100, the joint structure 100 with the beam 2C is referred to as joint structure 100F.

[0057] In the joint structures 100D, 100E, and 100F, a groove 27 recessed in a direction away from the joint surface 1a of the column 1 is formed on the end surface 22a of each of the fire-retardant layers 22 of the beams 2A, 2B, and 2C facing the column 1. A fire-resistant expansive material 18 is arranged in the groove 27. The fire-resistant expansive material 18 is formed in a plate shape. The plate surface of the fire-resistant expansive material 18 faces the direction in which the joint surface 1a and the joint surface 2a face each other. The fire-resistant expansive material 18 is arranged so as to face the surface 13 of the column 1. In the event of a fire, the fire-resistant expansive material 18 expands to seal the gap between the joint surface 1a of the column 1 and the joint surface 2a of the beam 2.

[0058] In the joint structures 100D and 100E, the grooves 27 are formed at positions away from the load support portion 21 in the thickness direction of the fire-retardant layer 22 of the beam 2. In the joint structure 100F, the grooves 27 are formed at positions closer to the load support portion 21 in the thickness direction of the fire-retardant layer 22 of the beam 2. A fire-resistant expansion material 18 is disposed in the grooves 27. In the joint structures 100D, 100E, and 100F, the grooves 27 may be formed at any positions in the thickness direction of the fire-retardant layer 22 of the beam 2.

[0059] In the joint structure 100D, the fitting portion 13d of the column 1 abuts against the side surface 23d of the surface layer 23 of the beam 2, and is fitted with it by a countersunk fit.

[0060] In the joint structures 100D, 100E, and 100F configured in this manner, a fire-retardant layer 22 of the beam 2 is disposed on the joint surface 2a of the beam 2. A surface layer 13 of the column 1 is disposed on the joint surface 1a of the column 1. A fire-resistant expansion material 18 is disposed on the joint surface 2a of the beam 2. In the event of a fire, the fire-resistant expansion material 18 expands and seals the gap between the joint surface 2a of the beam 2 and the joint surface 1a of the column 1, thereby providing a heat-shielding effect and preventing the load-bearing parts 11 and 21 from being exposed to external heat and catching fire, thereby ensuring fire resistance.

[0061] Furthermore, since the fire-resistant expansion material 18 only needs to be placed on the fire-retardant layer 22 on the joint surface 2a of the beam 2, processing can be simplified and construction can be easily performed.

[0062] Furthermore, grooves 27 are formed in the fire-retardant layer 22 on the joint surface 2a of the beam 2, and the fire-resistant expansion material 18 is placed in the grooves 27. Therefore, when the beam 2 is moved downward relative to the column 1 to install it, the fire-resistant expansion material 18 is prevented from coming into contact with the joint surface 1a of the column 1 and sliding down.

[0063] The shapes and combinations of the components shown in the above-described embodiment are merely examples, and various modifications can be made based on design requirements, etc., within the scope of the present invention.

[0064] For example, in the above embodiment, the joining structure between the column 1 and the beam 2 has been described as an example, but the present invention is not limited to this. The present invention can also be applied to a location where beams are joined at approximately right angles in a plan view.

[0065] In the first and second embodiments, the fire-resistant expansion material 18 is provided at all of the joints between the column 1 and the beams 2A, 2B, and 2C, but the present invention is not limited to this. It is sufficient that the fire-resistant expansion material 18 is provided so as to face at least one of the beams 2A, 2B, and 2C that are joined to the column 1.

[0066] In the first embodiment, the fire-resistant expansive material 18 is arranged in a position facing the fire-retardant layers 22 on both sides in the width direction, sandwiching the load-supporting portions 21 of the opposing beams 2, but the present invention is not limited to this. The fire-resistant expansive material 18 may be arranged in a position facing one of the fire-retardant layers 22. In the second embodiment, the fire-resistant expansive material 18 is arranged in the fire-retardant layers 22 on both sides in the width direction, sandwiching the load-supporting portions 21 of the beams 2, but the present invention is not limited to this. The fire-resistant expansive material 18 may be arranged in one of the fire-retardant layers 22.

[0067] In the first embodiment, the grooves 17 are formed in the surface layer 13 of the column 1 and the fire-resistant expansion material 18 is arranged in the grooves 17, but the present invention is not limited to this. The surface layer 13 may not have grooves formed therein, and the fire-resistant expansion material 18 may be arranged on the surface 13b of the surface layer 13.

[0068] In the second embodiment, the grooves 27 are formed in the fire-retardant layer 22 of the beam 2 and the fire-resistant expansion material 18 is arranged in the grooves 27, but the present invention is not limited to this. The fire-retardant expansion material 18 may also be arranged on the end surface 22a of the fire-retardant layer 22.

[0069] In addition, the first embodiment and the second embodiment may be combined so that the fire-resistant expansion material 18 is placed on the surface layer 13 of the column 1 and the fire-retardant layer 22 of the beam 2.

[0070] In addition, the fire-resistant expansion material 18 is arranged over substantially the entire length of the grooves 17 and 27, but the present invention is not limited to this. The fire-resistant expansion material 18 may be arranged partially in the length direction of the grooves 17 and 27. [Explanation of symbols]

[0071] 1 pillar (second structural member) 1a Joint surface (second joint surface) 2,2A,2B,2C Beam (first structural member) 2a Joint surface (1st joint surface) 11,21 Load support part 12,22 Fire-stop layer 13,23 Surface layer 13d Fitting part 17,27 Groove 18 Refractory expansion material 100, 100A, 100B, 100C, 100D, 100E, 100F Column and beam joint structure (joint structure between structural materials)

Claims

1. A joining structure between structural members arranged so that a first joining surface of a first structural member faces a second joining surface of a second structural member, The first structural material and the second structural material each include: a load-bearing portion that supports a load and includes wood; a fire-retardant layer disposed outside the load-bearing portion and having a higher fire resistance than the load-bearing portion; a surface layer disposed outside the fire-retardant layer, The fire-retardant layer of the first structural material is disposed on the first joint surface, the surface layer of the second structural material is disposed on the second joining surface, A joint structure between structural materials, in which a fire-resistant expansion material is arranged on a portion of at least one of the first joint surface and the second joint surface.

2. a groove portion recessed in a direction away from the first bonding surface is formed in the surface layer of the second bonding surface; The joining structure between structural members according to claim 1 , wherein the fire-resistant expansion material is disposed in the groove portion.

3. The fire-retardant layer on the first bonding surface has a groove recessed in a direction away from the second bonding surface, The joining structure between structural members according to claim 1 , wherein the fire-resistant expansion material is disposed in the groove portion.

4. the first structural member is a beam, 3. The joining structure between structural members according to claim 1, wherein the second structural member is a pillar.

5. 4. A joining structure between structural materials according to claim 1, wherein the second joining surface is provided with a fitting portion that protrudes toward the first structural material and that fits the first joining surface in a countersunk manner.

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