Column-beam joint construction

Abstract

The present invention provides a column-beam joint structure, via a steel joint member, that connects wooden upper and lower floor columns to beam members, possessing sufficient strength when installed in areas where bending moments do not act, and that can be easily constructed. [Solution] In the column-beam joint structure 1A, the joint member 10A is made of a steel pipe and comprises an upper connecting portion 13A provided on the upper side of the joint member 10A, a lower connecting portion 12A made of a steel plate provided on the lower side of the joint member 10A, and a beam joint portion 14A that is joined to the beam member. The lower end 3b of the upper floor column 3A and the upper connecting portion 13A, and the upper end 2t of the lower floor column 2A and the lower connecting portion 12A each have corresponding shapes and fit together, thereby joining the upper floor column 3A and the lower floor column 2A to the joint member 10A in such a way that relative displacement is impossible in any horizontal direction.

Description

Technical Field

[0001] The present invention relates to a column-beam joint structure in which a wooden upper column and a lower column are connected via a steel joint member and a beam member.

Background Art

[0002] When constructing a building structure, the lower wooden column and the upper wooden column may be joined vertically through a joint through which a beam is joined. Regarding this, Patent Document 1 discloses a column-beam framework including a lower wooden column, an upper wooden column disposed above the lower wooden column, a joint disposed between the lower wooden column and the upper wooden column, and a continuous steel beam having a beam portion extending from the joint. In this column-beam framework, a pair of lower pressure plates extend downward from the joint and are joined to the column head portion by a continuous bolt provided so as to penetrate the column head portion of the lower wooden column while sandwiching it from both sides in the material axis direction of the steel beam. Further, in this column-beam framework, a pair of upper pressure plates extend upward from the joint and are joined to the column foot portion by a continuous bolt provided so as to penetrate the column foot portion of the upper wooden column while sandwiching it from both sides in the material axis direction of the steel beam.

[0003] Further, Patent Document 2 discloses a column-beam joint structure formed by joining a wooden column member and a wooden beam member. The column-beam joint structure includes a joint member having a projection for connecting to a beam member on a side end face, made of a material harder than wood, an upper column member disposed on an upper end face of the joint member, and a lower column member disposed on a lower end face of the joint member. Patent Document 2 discloses that the joint member, the upper column member, and the lower column member are joined by inserting and arranging steel bars or bolts protruding vertically from the upper and lower end faces of the joint member into the upper column member and the lower column member. Patent Document 2 also discloses attaching and fixing steel bars or the like with a curable grout, an adhesive, or the like. Patent Document 2 also discloses a method in which a steel plate is made to protrude vertically from the upper and lower end faces of a joint member and inserted into the upper and lower column members, and then fasteners such as drift pins are passed through through holes provided on the sides of the steel plate and the upper and lower column members to connect the steel plate and the upper and lower column members.

[0004] Furthermore, Patent Document 3 discloses a column-beam joint structure comprising a lower column member as a wooden column member, a joining jig fixed to the upper end surface of the lower column member, and a steel beam as a beam member joined to the lower column member via the joining jig. The joining jig comprises a lower flange portion provided at its lower end and an upper flange portion provided at its upper end. The lower column member and the joining jig are joined by screwing a lag screw into the lower column member via the lower flange portion. The upper column member and the joining jig are joined by screwing a lag screw into the upper column member provided on top of the joining jig via the upper flange portion.

[0005] In this way, when joining a joint member to a wooden column, the joint member may be a steel plate extending upward or downward from the column-beam joint along a vertical plane, placed along the wooden column or embedded in the wooden column, and then passed through the column and the steel plate from a horizontal direction perpendicular to the vertical plane using drift pins or through bolts. Alternatively, the joint member may be a steel plate placed along the end face of the wooden column, and bolt members such as lag screw bolts or steel rods may be inserted from the steel plate into the column to join the joint member and the wooden column. In this case, if necessary, the bolt members or steel rods may be attached to the joint member and the wooden column with grout or adhesive. In this way, it is common practice to firmly join wooden columns and beams together.

[0006] Incidentally, building structures are sometimes constructed with a mixture of steel frame or reinforced concrete sections and wooden sections. In such cases, for example, horizontal loads can be borne by the steel frame or reinforced concrete core, while the wooden sections bear only vertical loads, thus preventing bending moments from acting on them. This design can be considered as a mixed planar structure. In such cases, if the connection structure between the wooden columns and beam members is simplified based on the premise that no bending moments act on them, construction may be made easier. A column-beam joint structure is desired that connects wooden upper and lower floor columns with beam members via steel joint members, which has sufficient strength when installed in areas where bending moments do not act, and is easy to construct. [Prior art documents] [Patent Documents]

[0007] [Patent Document 1] Japanese Patent Publication No. 2023-9651 [Patent Document 2] Japanese Patent Publication No. 2015-218464 [Patent Document 3] Japanese Patent Publication No. 2014-109150 [Overview of the project] [Problems that the invention aims to solve]

[0008] The problem that the present invention aims to solve is to provide a column-beam joint structure between wooden upper and lower floor columns and beam members via steel joint members, which has sufficient strength when installed in a part where no bending moment acts and can be easily constructed. [Means for solving the problem]

[0009] To solve the above problems, the present invention employs the following means. That is, the present invention provides a column-beam joint structure in which wooden upper and lower floor columns and beam members are connected via a steel joint member, wherein the joint member comprises a beam joint portion that is joined to the beam member, an upper connecting portion provided on the upper surface of the beam joint portion, and a lower connecting portion provided on the lower surface of the beam joint portion, wherein the upper connecting portion is embedded in the lower end of the upper floor column, or the upper connecting portion is joined to the joint member so as to cover the outer circumferential surface of the upper floor column, and the lower connecting portion is embedded in the upper end of the lower floor column, or the lower connecting portion is joined to the joint member so as to cover the outer circumferential surface of the lower floor column. While it is assumed that no shear force acts in areas where no bending moment acts, in actual behavior, it is anticipated that when the column-beam frame deforms horizontally, the column and the joint member will shift horizontally and undergo relative displacement at their joint. In contrast, according to the above configuration, the joint member comprises a beam joint that is joined to the beam member, an upper connecting portion provided on the upper surface of the beam joint, and a lower connecting portion provided on the lower surface of the beam joint. In such a joint member, the upper connecting portion is embedded in the lower end of the upper floor column, or the upper connecting portion is joined so as to cover the outer surface of the upper floor column, and the lower connecting portion is embedded in the upper end of the lower floor column, or the lower connecting portion is joined so as to cover the outer surface of the lower floor column. With this configuration, the upper floor column, the lower floor column, and the joint member are joined in such a way that relative displacement is impossible in any horizontal direction. Therefore, when a load is transmitted from the upper floor column to the lower floor column via the joint member, and when the column-beam frame deforms horizontally, the relative horizontal displacement between the upper floor column and the joint member, and between the joint member and the lower floor column is also suppressed. As described above, in the column-beam joint structure of the present invention, the bending moment becomes zero at the end of the column member, and the upper floor column and the lower floor column are connected via the joint member. In this way, sufficient strength can be ensured on the premise that no bending moment is borne. Furthermore, since the joint member has an upper connecting portion embedded in the lower end of the upper floor column, or the upper connecting portion is joined so as to cover the outer surface of the upper floor column, and a lower connecting portion embedded in the upper end of the lower floor column, or the lower connecting portion is joined so as to cover the outer surface of the lower floor column, at the construction site, for example, the lower floor column with the joint member already attached to its upper end can be erected, the beam member can be joined to the beam connecting portion of the joint member, and then the lower end of the upper floor column can be attached to the joint member, thereby constructing the column-beam joint structure described above. For this reason, there is basically no need to join the joint member to the wooden column using bolt members such as drift pins, through bolts, lag screw bolts, or steel rods. Also, there is no need to attach bolt members or steel rods to the column with grout or adhesive. Consequently, construction can be carried out easily. In this way, it becomes possible to realize a column-beam joint structure between wooden upper and lower floor columns and beam members via steel joint members, which has sufficient strength when installed in areas where bending moments do not act, and can be easily constructed.

[0010] In one embodiment of the present invention, the upper connecting portion and the lower connecting portion are formed of a steel pipe or a steel plate that covers the outer surface of the upper floor column or the lower floor column. With the above configuration, it is possible to appropriately realize a structure in which the joint member and the lower floor column are joined in such a way that relative displacement is impossible in any horizontal direction. [Effects of the Invention]

[0011] According to the present invention, it is possible to provide a column-beam joint structure between wooden upper and lower floor columns and beam members via a steel joint member, which has sufficient strength when installed in a part where no bending moment acts and can be easily constructed. [Brief explanation of the drawing]

[0012] [Figure 1] This is a schematic side view of a building structure using the column-beam joint structure according to an embodiment of the present invention. [Figure 2]It is an exploded perspective view of the above column-beam joint structure. [Figure 3] It is a side view of the joint part between the spigot member and the beam in the above column-beam joint structure. [Figure 4] It is a side view of the joint part between the spigot member and the beam in the column-beam joint structure according to the first modification of the above embodiment. [Figure 5] It is an exploded perspective view of the column-beam joint structure according to the second modification of the above embodiment. [Figure 6] It is an exploded perspective view of the column-beam joint structure according to the third modification of the above embodiment. [Figure 7] It is an exploded perspective view of the column-beam joint structure according to the fourth modification of the above embodiment. [Figure 8] It is an exploded perspective view of the column-beam joint structure according to the fifth modification of the above embodiment.

Embodiments for Carrying Out the Invention

[0013] The present invention is a column-beam joint structure in which a wooden upper floor column and a wooden lower floor column are connected via a steel spigot member, and a method for constructing the column-beam joint structure. On the spigot member, a lower connection part is provided on the lower end side of the beam joint part, and an upper connection part is provided on the upper end side of the beam joint part. Further, on the lower connection part and the upper connection part, a steel pipe, or an upper steel plate or a lower steel plate that covers the outer peripheral surface of the column or is inserted as a slit into the column cross-section is arranged. Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic side view of a building structure in which the column-beam joint structure in the present embodiment is used. The building structure 100 shown in FIG. 1 is constructed on the ground G. The building structure 100 is configured such that a first column-beam framework 101 and a second column-beam framework 102, which are constructed with different structures from each other, are adjacently joined at the boundary B. The first column-beam framework 101 is constructed, for example, as a steel structure or a reinforced concrete structure. In the second column-beam framework 102, at least the columns 2A and 3A are formed of wood. That is, the second column-beam framework 102 includes the wooden columns 2A and 3A. Thus, the building structure 100 is designed as a plane hybrid structure such that a steel structure or a reinforced concrete structure part and a wooden part are mixed.

[0014] Particularly, in the building structure 100, the first column-beam framework 101 constructed as a steel structure or a reinforced concrete structure has a larger area than the second column-beam framework 102 when viewed in plan. When a horizontal load acts on the building structure 100, the first column-beam framework 101 is configured to function as the core part of the building structure 100 by bearing the horizontal load. In such a case, the second column-beam framework 102 including the wooden columns 2A and 3A can be designed to bear only the vertical load and not have a bending moment acting thereon. The column-beam joint structure 1A of the present embodiment is such that, in a part where no bending moment acts as described above, a wooden lower-story column 2A provided in the lower layer F1, a wooden upper-story column 3A provided in the upper layer F2, and a beam member 4A are connected via a steel joint member 10A.

[0015] FIG. 2 is an exploded perspective view of the above column-beam joint structure. The lower floor column 2A is provided on the lower floor F1. The lower floor column 2A extends in the vertical direction DV on the lower floor F1. The lower floor column 2A extends from below to near the boundary between the lower floor F1 and the upper floor F2. The lower floor column 2A is a wooden column made of wood. In this embodiment, the lower floor column 2A is formed to have a rectangular cross-section. More specifically, the lower floor column 2A has a pair of sides 2r facing opposite directions, provided along a plane formed by a first horizontal direction DH1 along the horizontal plane and a vertical direction DV (vertical direction), and a pair of sides 2s facing opposite directions, provided along a plane formed by a second horizontal direction DH2 perpendicular to the first horizontal direction DH1 in the horizontal plane and a vertical direction DV.

[0016] Slits 2a and 2b are formed in the upper end 2t of the lower floor column 2A. The slits 2a and 2b are formed by cutting out downwards from the upper end surface 2f of the lower floor column 2A. The slits 2a and 2b consist of a first slit 2a and a second slit 2b. The first slit 2a is formed at the center of the upper end surface 2f in the second horizontal direction DH2, extending in the first horizontal direction DH1, and penetrating the lower floor column 2A in the first horizontal direction DH1. The second slit 2b is formed at the center of the upper end surface 2f in the first horizontal direction DH1, extending in the second horizontal direction DH2, and penetrating the lower floor column 2A in the second horizontal direction DH2. The first slit 2a and the second slit 2b are provided perpendicular to each other at the center of the upper end surface 2f. As a result, the slits 2a and 2b are formed to form a cross shape when viewed from above. The first slit 2a is formed such that, when viewed from the first horizontal direction DH1, its shape substantially matches the cross-sectional shape of the first lower steel plate 12a of the lower connecting portion 12A described later, allowing the first lower steel plate 12a to be accommodated inside. The second slit 2b is formed such that, when viewed from the second horizontal direction DH2, its shape substantially matches the cross-sectional shape of the second lower steel plate 12b of the lower connecting portion 12A described later, allowing the second lower steel plate 12b to be accommodated inside.

[0017] The upper floor column 3A is located on the upper floor F2. The upper floor column 3A extends vertically in the direction DV on the upper floor F2. The upper floor column 3A extends upward from near the boundary between the lower floor F1 and the upper floor F2. The upper floor column 3A is a wooden column made of wood. In this embodiment, the upper floor column 3A has the same cross-sectional shape as the lower floor column 2A. Alternatively, the upper floor column 3A may be formed to have a smaller cross-sectional area than the lower floor column 2A. The upper floor column 3A is formed to have a rectangular cross-section. A dowel hole 3d is formed at the lower end 3b of the upper floor column 3A. The dowel hole 3d is formed so that its central part is recessed upward from the lower end surface 3f of the upper floor column 3A. In this embodiment, the shape of the dowel hole 3d when viewed from above is substantially the same as the outer shape of the upper connecting part 13A, which will be described later, and the upper connecting part 13A is formed to be able to be housed inside it.

[0018] The joint member 10A is joined to the lower floor column 2A, the upper floor column 3A, and the beam member 4A, which will be described later, to form a column-beam joint structure 1A. The joint member 10A includes a central horizontal plate portion 11, a lower connection portion 12A, an upper connection portion 13A, and a beam joint portion 14A. The central horizontal plate section 11 is a steel plate provided along the horizontal plane. The central horizontal plate section 11 is formed in a substantially rectangular shape so as to be substantially the same as the cross-sectional shape of the lower floor column 2A and the upper floor column 3A.

[0019] The lower connecting portion 12A is provided on the lower side of the joint member 10A. The lower floor column 2A is joined to the lower connecting portion 12A, as will be described later. In this embodiment, the lower connecting portion 12A is formed of a steel plate. More specifically, the lower connecting portion 12A comprises a first lower steel plate 12a and a second lower steel plate 12b. The first lower steel plate 12a is provided so as to extend within the vertical plane formed by the first horizontal direction DH1 and the vertical direction DV. The first lower steel plate 12a is provided extending in the first horizontal direction DH1 at the center of the central horizontal plate portion 11 in the second horizontal direction DH2. The upper edge of the first lower steel plate 12a is joined to the lower surface of the central horizontal plate portion 11. The first lower steel plate 12a is formed to substantially coincide with the first slit 2a of the lower floor column 2A and to have a corresponding shape to it. The second lower steel plate 12b is provided so as to extend within the vertical plane formed by the second horizontal direction DH2 and the vertical direction DV. The second lower steel plate 12b is provided extending in the second horizontal direction DH2 at the center position in the first horizontal direction DH1 of the central horizontal plate portion 11. The upper end edge of the second lower steel plate 12b is joined to the lower surface of the central horizontal plate portion 11. The second lower steel plate 12b is formed to substantially coincide with the second slit 2b of the lower floor column 2A and to have a corresponding shape to it.

[0020] With this configuration, the first lower steel plate 12a and the second lower steel plate 12b are positioned perpendicular to each other at the center of the central horizontal plate section 11. As a result, the first lower steel plate 12a and the second lower steel plate 12b are formed to form a cross shape when viewed from above. The lower steel plates 12a and 12b as a whole are formed to correspond to the slits 2a and 2b of the lower floor column 2A. The lower connecting portion 12A and the upper end 2t of the lower floor column 2A are not limited to the above configuration, as long as they have corresponding shapes and a structure that allows them to fit together. For example, as will be explained later with reference to Figure 7 as a modified example, the lower connecting portion 12A may be made of a steel pipe.

[0021] The upper connecting portion 13A is provided above the joint member 10A. The upper floor column 3A is joined to the upper connecting portion 13A, as will be explained later. In this embodiment, the upper connecting portion 13A is formed from a steel pipe 13d, such as a circular steel pipe or a square steel pipe. The steel pipe 13d is oriented so that its axial direction coincides with the vertical direction DV. The lower end of the steel pipe 13d is joined to the center of the upper surface of the central horizontal plate portion 11. In this way, the steel pipe 13d is provided so as to extend upward from the upper surface of the central horizontal plate portion 11. The steel pipe 13d is formed to approximately coincide with the dowel hole 3d of the upper floor column 3A, and to have a corresponding shape to it. As will be explained later, the steel pipe 13d is used to function as a shear key between itself and the upper floor column 3A. Therefore, in order to increase the rigidity of the steel pipe 13d, concrete, mortar, or the like may be filled inside the steel pipe 13d. The upper connecting portion 13A and the lower end 3b of the upper floor column 3A are not limited to the above configuration, as long as they have corresponding shapes and a structure that allows them to fit together. For example, as will be explained later using Figure 6 as an example of a modified form, the upper connecting portion 13A may be made of steel plate.

[0022] The beam joint 14A is provided on the side of the joint member 10A. The beam member 4A is joined to the beam joint 14A, as will be explained later. The beam joint 14A is provided so as to protrude outward from all four sides of the joint member 10A. The beam joint 14A comprises a plurality of horizontal plate portions 14a and a plurality of vertical plate portions 14b. Each of the multiple horizontal plate sections 14a is formed such that each end edge 11a of the central horizontal plate section 11 protrudes outward at its center. Each of the multiple horizontal plate sections 14a is formed to be integral with the central horizontal plate section 11. Each of the multiple vertical plate sections 14b is formed such that the first lower steel plate 12a and the second lower steel plate 12b extend outward. Each of the multiple vertical plate sections 14b is formed to be integral with the first lower steel plate 12a and the vertical plate section 14b.

[0023] In this embodiment, rib plates 15 are provided at each position of the end edge 11a of the central horizontal plate section 11, perpendicular to the central horizontal plate section 11 (horizontal plate section 14a) and the vertical plate section 14b, and along the end edge 11a. In this embodiment, rib plates 15 are provided for each beam joint section 14A. Each of the rib plates 15 is provided in a position that aligns with the sides 2r and 2s of the lower floor column 2A when the joint member 10A is joined to the lower floor column 2A, as will be explained later. Such rib plates 15 are provided for the purpose of reinforcing the lower steel plates 12a, 12b and the vertical plate section 14b to suppress buckling. Therefore, if the lower steel plates 12a, 12b and the vertical plate section 14b are of sufficient thickness and the concern about buckling is low, the rib plates 15 may be omitted.

[0024] In the column-beam joint structure 1A of this embodiment, the lower floor column 2A and the joint member 10A are joined to each other. In this embodiment, the upper end 2t of the lower floor column 2A and the lower connecting portion 12A of the joint member 10A have corresponding shapes to each other. Therefore, by fitting them together, the upper end 2t of the lower floor column 2A and the lower connecting portion 12A of the joint member 10A are joined. More specifically, the first lower steel plate 12a of the lower connecting portion 12A, which extends in the first horizontal direction DH1, is inserted into the first slit 2a formed in the upper end 2t of the lower floor column 2A, which extends in the first horizontal direction DH1. At the same time, the second lower steel plate 12b of the lower connecting portion 12A, which extends in the second horizontal direction DH2, is inserted into the second slit 2b formed in the upper end 2t of the lower floor column 2A, which extends in the second horizontal direction DH2. In this manner, the joint member 10A and the lower floor column 2A are joined together by fitting them into place, with the lower steel plates 12a and 12b being housed and embedded in the slits 2a and 2b.

[0025] When joining the joint member 10A to the lower floor column 2A, it is acceptable to simply fit the upper end 2t of the lower floor column 2A and the lower connecting portion 12A of the joint member 10A together, as described above, but screws or the like may be used in combination as needed. In this case, for example, it is preferable to provide a through hole in the central horizontal plate portion 11 and screw the screw from above into the upper end surface 2f of the lower floor column 2A located below the central horizontal plate portion 11, so as to insert the screw through the through hole. Alternatively, in addition to simply fitting the lower floor column 2A and the joint member 10A together, they may also be joined using adhesive. This method makes the connection between the joint member 10A and the lower floor column 2A stronger. Furthermore, in the construction method of the column-beam joint structure of this embodiment, as will be explained later, in order to make on-site construction easier, the joint member 10A and the lower floor column 2A are manufactured in a factory or the like in a joined state and then transported to the site. In such a case, by joining the joint member 10A and the lower floor column 2A using screws or adhesive in addition to fitting, it is possible to suppress the detachment of the joint member 10A from the lower floor column 2A during transport.

[0026] In the column-beam joint structure 1A of this embodiment, the upper floor column 3A and the joint member 10A are joined to each other. In this embodiment, the lower end 3b of the upper floor column 3A and the upper connecting portion 13A of the joint member 10A have corresponding shapes to each other. Therefore, by fitting them together, the lower end 3b of the upper floor column 3A and the upper connecting portion 13A of the joint member 10A are joined. More specifically, a steel pipe 13d is inserted into a dowel hole 3d formed in the lower end 3b of the upper floor column 3A. In this manner, the joint member 10A and the upper floor column 3A are joined together by fitting the steel pipe 13d into the dowel hole 3d and embedding it. In addition to joining the joint member 10A and the upper floor column 3A by fitting, they may also be joined using adhesive or the like as appropriate.

[0027] In this state, when the lower floor column 2A, joint member 10A, and upper floor column 3A are joined vertically, the central horizontal plate portion 11, the lower connecting portion 12A, and the upper connecting portion 13A of the joint member 10A are embedded inside the vertically connected lower floor column 2A and upper floor column 3A, and are not easily visible from the outside. The beam joint portion 14A and the rib plate 15 protrude outward from the surfaces of the lower floor column 2A and upper floor column 3A.

[0028] Figure 3 is a side view of the joint between the joint member and the beam in a column-beam connection structure. In this embodiment, the beam member 4A is formed of steel. More specifically, in this embodiment, the beam member 4A is formed of H-shaped steel. The beam member 4A comprises an upper flange 4a, a lower flange 4b, and a web 4c. The upper flange 4a and the lower flange 4b ​​are provided extending in the horizontal plane. The lower flange 4b ​​is provided below the upper flange 4a. The web 4c is provided extending in the vertical plane. The web 4c is provided so as to connect the upper flange 4a and the web 4c in the vertical direction at their central portions in the width direction.

[0029] As described above, the beam member 4A is positioned so that its tip 4s abuts against the tip of the beam joint 14A. More specifically, the beam member 4A has an upper flange 4a at the same height as the horizontal plate portion 14a of the beam joint 14A, and is positioned so that the horizontal plate portion 14a extends from it. The beam member 4A is also positioned so that its web 4c is in the same plane as the vertical plate portion 14b of the beam joint 14A. Splice plates 16 are provided on both sides of the vertical plate portion 14b and the web 4c, straddling the vertical plate portion 14b and the web 4c, and running along each of them. The joint member 10A and the beam member 4A are then joined by tightening bolts so that they pass through the splice plates 16 and each of the vertical plate portion 14b and the web 4c. In Figure 3, a beam member 4A with a beam depth greater than the height of the vertical plate section 14b (length in the vertical direction DV) is joined to the beam joint 14A. Needless to say, instead, a beam member 4A having the same beam depth as the height of the vertical plate section 14b may also be joined to the beam joint 14A.

[0030] In the column-beam joint structure 1A described above, the load on the upper floor F2 is transmitted from the upper floor column 3A to the lower floor column 2A via the joint member 10A. Furthermore, as already explained, column-beam joint structure 1A is designed on the premise that no bending moment acts upon it. Therefore, there is basically no need to consider the burden of bending moment or shear force. However, in actual behavior, when the second column-beam frame 102 deforms horizontally, it can be assumed that a shear force will act on the columns 2A and 3A and the joint member 10A as they shift horizontally and undergo relative displacement at their joint.

[0031] In this regard, firstly, in the relationship between the joint member 10A and the upper floor column 3A, the upper connecting portion 13A, which is formed as a steel pipe 13d, is inserted into a dowel hole 3d formed on the lower end surface 3f of the upper floor column 3A. Therefore, when the column-beam joint structure 1A is viewed in plan, the inner surface of the dowel hole 3d is located further outward from the outer surface of the steel pipe 13d in any horizontal direction. As a result, the steel pipe 13d functions as a shear key, and even if the second column-beam frame 102 deforms in any horizontal direction and the upper floor column 3A attempts to shift relative to the joint member 10A, the outer surface of the upper connecting portion 13A and the inner surface of the dowel hole 3d come into contact, suppressing the relative displacement.

[0032] Furthermore, in the relationship between the joint member 10A and the lower floor column 2A, the lower connecting portion 12A, formed as the lower steel plates 12a and 12b, is inserted into the slits 2a and 2b formed on the upper end surface 2f of the lower floor column 2A. For example, when the second column-beam frame 102 attempts to deform in the first horizontal direction DH1, the second lower steel plate 12b, which is provided at the lower connection portion 12A so as to be perpendicular to the first horizontal direction DH1, comes into contact with the surface of the second slit 2b of the lower floor column 2A, which is provided so as to be perpendicular to the first horizontal direction DH1, thereby suppressing the relative displacement in the first horizontal direction DH1 between the joint member 10A and the lower floor column 2A. Furthermore, when the second column-beam frame 102 attempts to deform in the second horizontal direction DH2, the first lower steel plate 12a, which is provided at the lower connection portion 12A so as to be perpendicular to the second horizontal direction DH2, comes into contact with the surface of the first slit 2a of the lower floor column 2A, which is provided so as to be perpendicular to the second horizontal direction DH2, thereby suppressing the relative displacement in the second horizontal direction DH2 between the joint member 10A and the lower floor column 2A. Even if the deformation of the second column-beam frame 102 is in the direction between the first horizontal direction DH1 and the second horizontal direction DH2, the relative displacement between the joint member 10A and the lower floor column 2A in the direction between the first horizontal direction DH1 and the second horizontal direction DH2 is suppressed because both the first lower steel plate 12a and the second lower steel plate 12b come into contact with the respective surfaces of the first slit 2a and the second slit 2b. In this way, the lower floor column 2A and the upper floor column 3A are joined to the joint member 10A in such a way that relative displacement is impossible in either horizontal direction.

[0033] In the above explanation, the floor indicated as F1 in Figure 1 is considered the lower floor, the floor indicated as F2 is considered the upper floor, and the lower floor column 2A is provided on floor F1, and the upper floor column 3A is provided on floor F2. For example, if a column-beam joint structure 1A is also provided on the floor one level above these, the column that was treated as the upper floor column 3A on floor F2 will be treated as the lower floor column 2A. In other words, in this case, the floor indicated as F2 in Figure 1 is considered the lower floor, the floor indicated as F3 is considered the upper floor, and the lower floor column 2A is provided on floor F2, and the upper floor column 3A is provided on floor F3, and the same explanation as above can be applied.

[0034] Next, we will explain how to construct the column-beam joint structure 1A described above. First, the columns to be used as lower floor columns 2A and upper floor columns 3A are manufactured in a factory or similar facility. Similarly, the joint members 10A are also manufactured in a factory or similar facility. While it is conceivable to transport these columns to the construction site individually and assemble them there, in this embodiment, the joint members 10A are joined to the upper ends of the columns to be used as lower floor columns 2A and upper floor columns 3A in a factory or similar facility. In this way, the columns to be used as lower floor columns 2A and upper floor columns 3A are manufactured with the joint members 10A already joined to their upper ends and then transported to the construction site. Then, the column, which has been manufactured and transported with the joint member 10A already attached to its upper end, is erected as the lower floor column 2A (lower floor column erection process).

[0035] Next, the beam member 4A is joined to the joint member 10A which is connected to the upper end 2t of the lower floor column 2A (beam member joining process). Similarly, the column that has been manufactured and transported with the joint member 10A already attached to its upper end is used as the upper floor column 3A, and the lower end 3b of the upper floor column 3A is attached to the joint member 10A to erect the lower end 3b (upper floor column erection process). Subsequently, a floor is constructed above the beam member 4A. The floor can be constructed, for example, by pouring concrete to form a floor slab. By carrying out this work sequentially from the lower levels upwards, the building structure 100 is constructed.

[0036] Furthermore, when constructing a floor slab by pouring concrete, for example, anchor bolts may be welded to the upper surface of the horizontal plate portion 14a of the beam joint portion 14A, which is the portion that protrudes from the surface of the lower floor column 2A and the upper floor column 3A, so that the anchor bolts may be embedded in the poured concrete. In this case, the welding of the anchor bolts may be performed at a factory or other facility when manufacturing the joint member 10A, rather than on site. Additionally, fire-resistant covering materials such as gypsum board or heat-resistant rock wool may be installed to surround the lower floor column 2A and the upper floor column 3A.

[0037] The column-beam joint structure 1A described above connects the wooden upper floor column 3A and lower floor column 2A with the beam member 4A via a steel joint member 10A. The joint member 10A is made of a steel pipe 13d or steel plate and includes an upper connecting portion 13A provided on the upper side of the joint member 10A, a lower connecting portion 12A made of a steel pipe or steel plate 12a, 12b provided on the lower side of the joint member 10A, and a beam joint portion 14A that is joined to the beam member 4A. The lower end 3b of the upper floor column 3A and the upper connecting portion 13A, and the upper end 2t of the lower floor column 2A and the lower connecting portion 12A each have corresponding shapes and fit together, thereby joining the upper floor column 3A and lower floor column 2A with the joint member 10A in such a way that relative displacement is impossible in any horizontal direction. While it is assumed that no shear force acts in areas where no bending moment acts, in actual behavior, it is anticipated that when the column-beam frame 102 deforms horizontally, the column and the joint member 10A will shift horizontally and undergo relative displacement at their joint. In contrast, with the above-described configuration, the joint member 10A is formed from a steel pipe 13d and includes an upper connecting portion 13A provided on the upper side of the joint member 10A, a lower connecting portion 12A provided on the lower side of the joint member 10A and formed from steel plates 12a and 12b, and a beam connecting portion 14A that is joined to the beam member 4A. In such a joint member 10A, the lower end 3b of the upper floor column 3A and the upper connecting portion 13A, and the upper end 2t of the lower floor column 2A and the lower connecting portion 12A each have corresponding shapes and fit together, thereby joining the upper floor column 3A and the lower floor column 2A to the joint member 10A in such a way that relative displacement is impossible in any horizontal direction. Therefore, the load is transmitted from the upper floor column 3A to the lower floor column 2A via the joint member 10A, and the relative horizontal displacement between the upper floor column 3A and the joint member 10A, and between the joint member 10A and the lower floor column 2A, when the column-beam frame 102 deforms horizontally is also suppressed. In this way, sufficient strength can be ensured on the premise that no bending moment is borne. Furthermore, since the lower end 3b of the upper floor column 3A and the upper connecting part 13A, and the upper end 2t of the lower floor column 2A and the lower connecting part 12A, each have corresponding shapes and are joined by fitting them together, at the construction site, for example, the lower floor column 2A with the joint member 10A fitted to its upper end 2t can be erected, the beam member 4A can be joined to the beam connecting part 14A of the joint member 10A, and then the lower end 3b of the upper floor column 3A can be fitted to the joint member 10A, thereby constructing the column-beam joint structure 1A as described above. For this reason, there is basically no need to join the joint member 10A to the wooden column using bolt members such as drift pins, through bolts, lag screw bolts, or steel rods. Also, there is no need to attach bolt members or steel rods to the column with grout or adhesive. Therefore, construction can be carried out easily. In this way, it becomes possible to realize a column-beam joint structure 1A, which connects wooden upper-floor columns 3A and lower-floor columns 2A with beam members 4A via steel joint members 10A, which has sufficient strength when installed in a part where no bending moment acts and can be easily constructed.

[0038] In the column-beam joint structure 1A described above, as already explained, there is basically no need to join the joint member 10A to the wooden column using bolt members such as drift pins, through bolts, lag screw bolts, or steel rods. Therefore, the number of members required for joining is reduced, which can lower costs.

[0039] Furthermore, the lower connecting portion 12A is equipped with lower steel plates (first lower steel plate 12a, second lower steel plate 12b) that are formed in a cross shape when viewed from above. The lower floor column 2A has cross-shaped slits (first slit 2a, second slit 2b) formed at the upper end 2t to correspond to the lower steel plates 12a and 12b. The joint member 10A and the lower floor column 2A are joined together by fitting them into place, as the lower steel plates 12a and 12b are housed and embedded in the slits 2a and 2b. With the above configuration, a structure can be appropriately realized in which the joint member 10A and the lower floor column 2A are joined in such a way that relative displacement is impossible in any horizontal direction.

[0040] Furthermore, the upper connecting portion 13A is equipped with a steel pipe 13d positioned so that its axial direction coincides with the vertical direction DV, and in the upper floor column 3A, a dowel hole 3d is formed in the lower end surface 3f, and the joint member 10A and the upper floor column 3A are joined together by fitting the steel pipe 13d into the dowel hole 3d and embedding it. With the above configuration, a structure can be appropriately realized in which the joint member 10A and the upper floor column 3A are joined in such a way that relative displacement is impossible in any horizontal direction.

[0041] In particular, in the configuration described above, the lower connection part 12A and the upper connection part 13A function as guides when attaching the joint member 10A to the lower floor column 2A or when joining the upper floor column 3A to the joint member 10A. Therefore, construction becomes easier.

[0042] Furthermore, the method for constructing the column-beam joint structure 1A described above involves constructing a column-beam joint structure 1A in which wooden upper floor columns 3A and lower floor columns 2A and beam members 4A are connected via a steel joint member 10A, wherein the joint member 10A is formed from a steel pipe 13d or steel plate and comprises an upper connecting portion 13A provided on the upper side of the joint member 10A, a lower connecting portion 12A provided on the lower side of the joint member 10A and formed from steel pipes or steel plates 12a, 12b, and a beam joint portion 14A that is joined to the beam member 4A, and the lower end 3b of the upper floor column 3A and the upper connecting portion 13A and the lower The upper end 2t and lower connecting portion 12A of the floor column 2A each have corresponding shapes and fit together, thereby joining the upper floor column 3A and the lower floor column 2A with the joint member 10A so that relative displacement is impossible in any horizontal direction. The lower floor column 2A is manufactured with the joint member 10A already joined to its upper end 2t, transported to the construction site, and erected. This process includes a lower floor column erection step, where a beam member 4A is joined to the joint member 10A, and an upper floor column erection step, where the lower end 3b of the upper floor column 3A is joined to the joint member 10A to erect the upper floor column 3A. With the above configuration, similar to the explanation for column-beam joint structure 1A, it becomes possible to realize a method for constructing a column-beam joint structure 1A via a steel joint member 10A between wooden upper floor columns 3A and lower floor columns 2A and beam members 4A, which has sufficient strength when installed in a part where no bending moment acts and can be easily constructed.

[0043] (Modified example of Embodiment 1) Next, a first modified example of the column-beam joint structure and the method for constructing the column-beam joint structure shown as the above embodiment will be described using Figure 4. Figure 4 is a side view of the joint portion between the joint member and the beam in the column-beam joint structure according to this modified example. In the column-beam joint structure 1A of the above embodiment, the beam member 4A was made of steel, but in the column-beam joint structure 1B of this embodiment, the beam member 4B is made of wood. In such a case, the beam member 4B can be joined to the joint member 10B by configuring the beam joint portion 14B of the joint member 10B as shown in Figure 4, for example.

[0044] The configuration of the joint member 10B, other than the beam joint portion 14B, is the same as that of the joint member 10A in the above embodiment, so a description is omitted. In this modified example, the beam joint 14B comprises a horizontal plate portion 14a, a support plate portion 14c, and a connecting plate 14d. The horizontal plate portion 14a is formed in the same manner as in the above embodiment, such that the central horizontal plate portion 11 protrudes outward. The horizontal plate portion 14a is formed to be integral with the central horizontal plate portion 11. The support plate portion 14c is provided below the horizontal plate portion 14a, positioned parallel to the horizontal plate portion 14a. The connecting plate 14d is provided extending in the vertical direction DV along the sides 2r and 2s of the lower floor column 2A. The connecting plate 14d is joined to the horizontal plate portion 14a and the support plate portion 14c, connecting them in the vertical direction DV.

[0045] In the beam member 4B, a notch 4d is formed so that the lower surface of the end is cut upward. The notch 4d is formed to have a shape corresponding to the shape of the support plate portion 14c. Similarly, on the upper surface, a notch 4e is formed so that the upper surface is cut downward. The notch 4e is formed to have a shape corresponding to the shape of the horizontal plate portion 14a. Such a beam member 4B is provided such that its end is sandwiched between the support plate portion 14c and the horizontal plate portion 14a of the beam joint 14B. The end of the beam member 4B is provided with respect to the beam joint 14B such that the support plate portion 14c is housed in the notch 4d and the horizontal plate portion 14a is housed in the notch 4e. In this way, the beam joint 14A is supported by the support plate portion 14c, with its end resting on the support plate portion 14c.

[0046] (Second modified example of the embodiment) Next, a second modified example of the column-beam joint structure and the method for constructing the column-beam joint structure shown as the above embodiment will be described using Figure 5. Figure 5 is an exploded perspective view of the column-beam joint structure according to this modified example. The joint member 10C used in the column-beam joint structure 1C of this modified example does not have a rib plate 15. Instead, the lower connection portion 12C of the joint member 10C includes a lower lateral steel plate 12c in addition to the first lower steel plate 12a and the second lower steel plate 12b. Thus, the lower connection portion 12C is formed by steel plates 12a, 12b, and 12c.

[0047] The lower lateral steel plates 12c are provided at each end edge 11a of the central horizontal plate section 11, perpendicular to the central horizontal plate section 11 (horizontal plate section 14a) and the vertical plate section 14b, and along the end edge 11a. Each lower lateral steel plate 12c is provided to extend along the entire length of each end edge 11a. At its end, each lower lateral steel plate 12c is provided perpendicular to another adjacent lower lateral steel plate 12c and joined to that other lower lateral steel plate 12c. Each of the lower lateral steel plates 12c is positioned along the sides 2r and 2s of the lower floor column 2A, respectively, when the joint member 10C is joined to the lower floor column 2A, so as to face the sides 2r and 2s. As a result, the upper end 2t of the lower floor column 2A is surrounded and restrained by each of the lower lateral steel plates 12c. In this configuration, even if the second column-beam frame 102 deforms horizontally and the joint member 10C and the lower floor column 2A attempt to displace relative to each other, the first lower steel plate 12a and the second lower steel plate 12b come into contact with the respective surfaces of the first slit 2a and the second slit 2b, and either the side surface 2r or 2s of the lower floor column 2A comes into contact with the inner surface of the opposing lower lateral steel plate 12c, thereby suppressing the relative displacement.

[0048] Thus, the lower connecting portion 12C comprises a lower steel plate (first lower steel plate 12a, second lower steel plate 12b) formed in a cross shape when viewed from above, and a lower lateral steel plate 12c provided along the sides 2r and 2s of the lower floor column 2A. The lower floor column 2A has a cross-shaped slit (first slit 2a, second slit 2b) formed at its upper end 2t, corresponding to the lower steel plates 12a and 12b. The joint member 10C and the lower floor column 2A are joined together by fitting them into place, with the lower steel plates 12a and 12b being housed and embedded in the slits 2a and 2b, and the lower lateral steel plate 12c surrounding the upper end 2t of the lower floor column 2A. With the above configuration, a structure can be appropriately realized in which the joint member 10C and the lower floor column 2A are joined in such a way that relative displacement is impossible in any horizontal direction.

[0049] In this modified example, when joining the joint member 10C to the lower floor column 2A, for example, a through hole may be made in the lower side steel plate 12c, and a screw may be screwed in from the side into the side surfaces 2r and 2s of the lower floor column 2A, passing through this through hole. This makes the joint between the joint member 10C and the lower floor column 2A stronger. Furthermore, when the joint member 10C and the lower floor column 2A are manufactured in a factory or the like in a joined state and then transported to the site, it is possible to suppress the detachment of the joint member 10C from the lower floor column 2A during transport.

[0050] (Third modified example of the embodiment) Next, a third modified example of the column-beam joint structure and the method for constructing the column-beam joint structure shown as the above embodiment will be described using Figure 6. Figure 6 is an exploded perspective view of the column-beam joint structure according to this modified example. The column-beam joint structure 1D of this modified example is a further modification of the column-beam joint structure 1C described above as the second modified example. The joint member 10D used in the column-beam joint structure 1D is made of a steel plate instead of a steel pipe, and is equipped with an upper lateral steel plate 13c instead of a steel pipe 13d.

[0051] The upper lateral steel plates 13c are provided at each end edge 11a of the central horizontal plate section 11, perpendicular to the central horizontal plate section 11 (horizontal plate section 14a) and along the end edge 11a. Each upper lateral steel plate 13c is provided to extend along the entire length of each end edge 11a. At its end, each upper lateral steel plate 13c is provided perpendicular to another adjacent upper lateral steel plate 13c and joined to that other upper lateral steel plate 13c. Each of the upper lateral steel plates 13c is positioned along each of the sides of the upper floor column 3D, facing the side when the upper floor column 3D is joined to the joint member 10D. As a result, the lower end 3b of the upper floor column 3D is surrounded and restrained by each of the upper lateral steel plates 13c. Furthermore, in this modified example, the upper connecting portion 13D does not include the steel pipe 13d used as a shear key, as described in the embodiment. Therefore, the upper column 3D in this modified example is not provided with a dowel hole 3d for accommodating the steel pipe 13d. In this configuration, even if the second column-beam frame 102 deforms horizontally and the joint member 10D and the upper floor column 3D attempt to displace relative to each other, the relative displacement is suppressed because one of the sides of the upper floor column 3D comes into contact with the inner surface of the opposing upper lateral steel plate 13c.

[0052] Furthermore, when joining the upper floor column 3D to the joint member 10D, for example, through holes may be made in the upper side steel plate 13c, and screws may be screwed in from the side to the side of the upper floor column 3D, passing through these through holes. This makes the joint between the joint member 10D and the upper floor column 3D stronger.

[0053] In this modified example, the lower connecting portion 12A is equipped with a lower lateral steel plate 12c, and the upper floor column 3D has the same cross-sectional shape as the lower floor column 2A. Therefore, when viewed from above, the position of the upper lateral steel plate 13c is the position of the end edge 11a of the central horizontal plate portion 11, which is the position where the lower lateral steel plate 12c is provided. Consequently, in this modified example, the upper lateral steel plate 13c is constructed in such a way that the lower lateral steel plate 12c extends upward and becomes a single unit. For example, if the upper floor column 3D is formed to have a smaller cross-sectional area than the lower floor column 2A, the upper lateral steel plate 13c will be positioned inside the edge 11a of the central horizontal plate portion 11 when viewed from above.

[0054] Thus, the upper connecting portion 13D is provided with upper lateral steel plates 13c that are arranged along each of the sides of the upper floor column 3D, and the joint member 10D and the upper floor column 3D are fitted together and joined by the upper lateral steel plates 13c surrounding the lower end 3b of the upper floor column 3D. With the above configuration, a structure can be appropriately realized in which the joint member 10D and the upper floor column 3D are joined in such a way that relative displacement is impossible in any horizontal direction.

[0055] Incidentally, wood is highly absorbent. Therefore, when concrete and wood come into contact, moisture inside the concrete is absorbed by the wood. As a result, the chemical reactions of the materials that make up the concrete are accelerated, which can cause the concrete to deteriorate prematurely. In contrast, in this modified configuration, when concrete is poured around the upper floor column 3D to form the floor slab, the upper lateral steel plate 13c separates the concrete from the wooden upper floor column 3D, thereby suppressing the premature deterioration of the concrete as described above. Furthermore, in order to effectively suppress the premature deterioration of the concrete, it is desirable that the height of the upper lateral steel plate 13c be greater than or equal to the thickness of the floor slab. Furthermore, in this modified example, the upper floor column 3D does not have a dowel hole 3d for accommodating the steel pipe 13d, and at least at the lower end 3b, there is no cross-sectional loss. Therefore, a configuration can be realized that maximizes the use of the column's cross-sectional force (axial load-bearing capacity).

[0056] (Fourth modified example of the embodiment) Next, a fourth modified example of the column-beam joint structure and the method for constructing the column-beam joint structure shown as the above embodiment will be described using Figure 7. Figure 7 is an exploded perspective view of the column-beam joint structure according to this modified example. The column-beam joint structure 1E of this modified example differs from the column-beam joint structure 1A of the above embodiment in that the lower connecting portion 12E of the joint member 10E is a steel pipe 12d instead of steel plates 12a and 12b. More specifically, the joint member 10E includes a lower horizontal plate portion 17. The lower horizontal plate portion 17 is provided below the central horizontal plate portion 11 and parallel to the central horizontal plate portion 11. In this modified example, the vertical plate portion 14b of the beam joint portion 14A is provided so as to extend inward from the central horizontal plate portion 11 in the first horizontal direction DH1 and the second horizontal direction DH2 when viewed from above, and the lower horizontal plate portion 17 is provided along the lower end edge of the vertical plate portion 14b as described above and is joined to that end edge. The lower horizontal plate portion 17 is formed in a substantially rectangular shape so as to be substantially the same as the cross-sectional shape of the lower floor column 2E. In this modified example, the lower connecting portion 12E is formed by a steel pipe 12d, such as a circular steel pipe or a square steel pipe. The steel pipe 12d is positioned so that its axial direction coincides with the vertical direction DV. The upper end of the steel pipe 12d is joined to the center of the lower surface of the lower horizontal plate portion 17. In this way, the steel pipe 12d is provided to extend downward from the lower surface of the lower horizontal plate portion 17.

[0057] In this modified example, the upper end 2t of the lower floor column 2E has a dowel hole 2d formed therein, corresponding to the steel pipe 12d, instead of slits 2a and 2b. The dowel hole 2d is formed so that its central part is recessed downward from the upper end surface 2f of the lower floor column 2E. In this embodiment, the shape of the dowel hole 2d when viewed from above is approximately the same as the outer shape of the steel pipe 12d, and it is formed so that the lower connecting part 12E (steel pipe 12d) can be accommodated inside. The steel pipe 12d is used to function as a shear key between it and the lower floor column 2E. Therefore, to increase the rigidity of the steel pipe 12d, concrete or mortar may be filled inside it. In this configuration, even if the second column-beam frame 102 deforms horizontally and the joint member 10E and the lower floor column 2E attempt to displace relative to each other, the relative displacement is suppressed by the contact between the outer surface of the steel pipe 12d and the inner surface of the dowel hole 2d.

[0058] Thus, the lower connecting portion 12E is equipped with a steel pipe 12d positioned so that its axial direction coincides with the vertical direction DV, and in the lower floor column 2E, a dowel hole 2d is formed on the upper end surface 2f, and the joint member 10E and the lower floor column 2E are joined together by fitting the steel pipe 12d into the dowel hole 2d and embedding it. With the above configuration, a structure can be appropriately realized in which the joint member 10E and the lower floor column 2E are joined in such a way that relative displacement is impossible in any horizontal direction.

[0059] (Modified example of Embodiment 5) Next, a fifth modified example of the column-beam joint structure and the method for constructing the column-beam joint structure shown as the above embodiment will be described using Figure 8. Figure 8 is an exploded perspective view of the column-beam joint structure according to this modified example. The column-beam joint structure 1F of this modified example is a further modification of the column-beam joint structure 1D described above as the third modified example. The joint member 10F used in the column-beam joint structure 1F has a configuration in which the lower connection part 12F does not have lower steel plates 12a and 12b, but only a lower lateral steel plate 12c.

[0060] More specifically, the joint member 10F includes a lower horizontal plate portion 17. The lower horizontal plate portion 17 is provided below the central horizontal plate portion 11 and parallel to the central horizontal plate portion 11. In this modified example, the vertical plate portion 14b of the beam joint portion 14A is provided so as to extend inward from the central horizontal plate portion 11 in the first horizontal direction DH1 and the second horizontal direction DH2 when viewed from above, and the lower horizontal plate portion 17 is provided along the lower end edge of the vertical plate portion 14b as described above and is joined to that end edge. The lower horizontal plate portion 17 is formed in a substantially rectangular shape so as to be substantially the same as the cross-sectional shape of the lower floor column 2F. The lower lateral steel plates 12c are provided at each end edge of the lower horizontal plate section 17 so as to be perpendicular to the lower horizontal plate section 17. Each lower lateral steel plate 12c is provided so as to extend along the entire length of each end edge of the lower horizontal plate section 17. At its end, each lower lateral steel plate 12c is provided perpendicular to another adjacent lower lateral steel plate 12c and joined to that other lower lateral steel plate 12c. Each of the lower lateral steel plates 12c is positioned along each side of the lower floor column 2F, facing that side, when the joint member 10F is joined to the lower floor column 2F. As a result, the upper end 2t of the lower floor column 2F is surrounded and restrained by each lower lateral steel plate 12c. Furthermore, in this modified example, the lower connecting portion 12F does not have the lower steel plates 12a and 12b as described in the embodiment. Therefore, the lower floor column 2F of this modified example does not have slits for accommodating the lower steel plates 12a and 12b. In this configuration, even if the second column-beam frame 102 deforms horizontally and the joint member 10F and the lower floor column 2F attempt to displace relative to each other, the relative displacement is suppressed because one of the sides of the lower floor column 2F comes into contact with the inner surface of the lower lateral steel plate 12c which is provided opposite to it.

[0061] Thus, the lower connecting section 12F is equipped with lower lateral steel plates 12c provided along each of the sides of the lower floor column 2F, and the joint member 10F and the lower floor column 2F are fitted together and joined by the lower lateral steel plates 12c surrounding the upper end 2t of the lower floor column 2F. With the above configuration, it is possible to appropriately realize a structure in which the joint member 10F and the lower floor column 2F are joined in such a way that relative displacement is impossible in any horizontal direction.

[0062] Furthermore, in this modified example, the lower connecting portion 12F does not have slits 2a and 2b that accommodate the lower steel plates 12a and 12b, which are formed in a cross shape, and at least in the upper end portion 2t, there is no cross-sectional loss. Therefore, a configuration can be realized that makes maximum use of the sectional force (axial load-bearing capacity) of the column.

[0063] It should be noted that the column-beam joint structure and the method for constructing the column-beam joint structure of the present invention are not limited to the embodiments and modifications described above with reference to the drawings, and various other modifications are conceivable within the technical scope. For example, in the embodiment described with reference to Figure 2, a steel pipe 13d was joined to the upper surface of the central horizontal plate section 11 as an upper connecting section 13A. However, instead, the upper connecting section may be provided with a steel plate that is formed in a cross shape when viewed from above, similar to the lower connecting section 12A, as the upper steel plate. In this case, a slit is formed in the upper floor column, similar to the lower floor column 2A, to correspond to this cross-shaped upper steel plate. In such cases, both the lower and upper connecting sections are constructed with steel plates that form a cross shape when viewed from above. In other words, in this modified form, the upper connecting portion is provided with an upper steel plate that is formed in a cross shape when viewed from above, and the upper floor column has a cross-shaped slit at its lower end corresponding to the upper steel plate, and the joint member and the upper floor column are fitted together and joined by the upper steel plate being housed and embedded in the slit. With the above configuration, it is possible to appropriately realize a structure in which the joint member and the upper floor column are joined in such a way that relative displacement is impossible in any horizontal direction.

[0064] As described above, when an upper steel plate formed in a cross shape when viewed from above is provided as the upper connection part, the lower connection part may be realized as a steel pipe, as explained in the fourth modified example using Figure 7. Alternatively, if an upper steel plate formed in a cross shape when viewed from above is provided as the upper connection part, the lower connection part may be implemented using only a lower lateral steel plate that surrounds the upper end of the lower floor column, as explained in the fifth modified example using Figure 8.

[0065] Furthermore, the upper connection portion may be implemented as a steel pipe, as described in the embodiment using Figure 2, while the lower connection portion may be implemented as only a lower lateral steel plate that surrounds the upper end of the lower floor column, as described in the fifth modified example using Figure 8. Furthermore, this configuration can be reversed vertically, and the upper connection can be realized as only an upper lateral steel plate that surrounds the lower end of the upper floor column, as explained in the third modified example using Figure 6, while the lower connection can be realized as a steel pipe, as explained in the fourth modified example using Figure 7.

[0066] It goes without saying that, in any of the above modifications, as described in the embodiments, screws or adhesives may be used in conjunction with the joint between the lower floor column and the joint member, or between the joint member and the upper floor column, to further strengthen the joint by fitting, or to prevent the joint member from falling off the lower floor column during transport. In addition to the above, it is possible to select or discard the configurations listed in the above embodiments and their respective modifications, or to change them to other configurations as appropriate. [Explanation of Symbols]

[0067] 1A~1F Column beam joint structure 17 Lower horizontal plate section 2A, 2E, 2F Lower floor column 12A, 12C, 12E, 12F Lower connection part 2a 1st slit (slit) 12a 1st lower steel plate (steel plate, lower steel plate) 2b 2nd slit (slit) 12b 2nd lower steel plate (steel plate, lower steel plate) 2d Dowel hole 12c Lower side steel plate (steel plate) 2t upper end 12d steel pipe 3A, 3D Upper floor columns; 13A, 13D Upper connection section 3b Lower end 13c Upper side steel plate (steel plate) 3D dowel holes for 13D steel pipes 4. Beam members 14A, 14B Beam joint 10A~10F Joint member DH1 First horizontal direction (horizontal direction) 11 Central horizontal plate part DH2 2nd horizontal direction (horizontal direction)

Claims

1. A column-beam joint structure in which wooden upper and lower floor columns and beam members are connected via steel joint members, The joint member comprises a beam joint portion joined to the beam member, an upper connecting portion provided on the upper surface of the beam joint portion, and a lower connecting portion provided on the lower surface of the beam joint portion. The upper connecting portion is embedded in the lower end of the upper floor column, or the upper connecting portion is joined to the joint member so as to cover the outer circumferential surface of the upper floor column. The lower connecting portion is embedded in the upper end of the lower floor column, or the lower connecting portion is joined to the joint member so as to cover the outer surface of the lower floor column. A column-beam joint structure characterized by the following features.

2. The upper and lower connecting portions are formed from steel pipes or steel plates that cover the outer surfaces of the upper and lower floor columns. The column-beam joint structure according to feature 1.

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