Joint structure

Abstract

To provide a connection structure capable of properly joining a connection part where a pair of upper and lower pillars whose side surfaces are on different planes and in twisted positions is arranged adjacent to each other.SOLUTION: A connection structure 100 is a connection structure of a connection part A where a pair of pillars 3 and 4 including a bottom pillar of a square column and a top pillar of a square column whose side surfaces are on different planes and twisted positions intersects in an X shape on an intersection plane. The connection structure includes: a vertical steel plate 5; a lower diaphragm 6 that is joined to an upper ends of the bottom pillars 3A and 4A of the pair of pillars 3 and 4; an upper diaphragm 7 that is arranged along a horizontal plane and is joined to the lower ends of the top pillars 3B and 4B of the pair of pillars 3 and 4; a first enclosure 8 that is arranged along the vertical plane on one side of the vertical steel plate 5 sandwiched therebetween and joined to the vertical steel plate 5, the lower diaphragm 6 and the upper diaphragm 7, and a second enclosure 9 that is arranged along the vertical plane on the other side with the vertical steel plate 5 sandwiched therebetween and joined to vertical steel plate 5, to lower diaphragm 6 and the upper diaphragm 7.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a joint structure. [Background technology]

[0002] Ultra-high rise structures and ultra-high rise seismically isolated structures exceeding 300m in height require high horizontal rigidity to ensure the safety of the structure during earthquakes and storms, but it is difficult to ensure this horizontal rigidity with the rigid frame structures used in general structures.One rational frame structure that can ensure this horizontal rigidity is one in which the framework around the structure's perimeter is combined in a diagonal lattice pattern without using vertical columns.

[0003] In a diagonal lattice frame structure, the structure of the joints between members becomes complicated. Patent Document 1 proposes a joint member in which the ends of a pair of second shaft members that are inclined with respect to the vertical direction are connected to the ends of a first shaft member that extends vertically. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2020-60042 Summary of the Invention [Problem to be solved by the invention]

[0005] The joint (joint section) where a pair of adjacent upper and lower pillars with sides on different planes and in twisted positions is arranged has an extremely complex fit, making it difficult to construct.

[0006] In view of the above circumstances, the present invention provides a joint structure that can properly join a joint section in which a pair of adjacent upper and lower pillars whose side surfaces are on different planes and in twisted positions are arranged. [Means for solving the problem]

[0007] In order to achieve the above object, the present invention employs the following means. In other words, the joint structure of the present invention is a joint structure of a joint section in which a pair of columns, each having a lower column and an upper column that are square columns whose sides are on different planes and in twisted positions, intersect in an X-shape at an intersecting plane along a vertical plane, and is equipped with vertical steel plates arranged at the intersecting plane and joined to the pair of columns, a lower diaphragm arranged along a horizontal plane and joined to the upper end of the lower column of the pair of columns, an upper diaphragm arranged along the horizontal plane and joined to the lower end of the upper column of the pair of columns, a first enclosure arranged along the vertical plane on one side of the vertical steel plate and joined to the vertical steel plate, the lower diaphragm and the upper diaphragm, and a second enclosure arranged along the vertical plane on the other side of the vertical steel plate and joined to the vertical steel plate, the lower diaphragm and the upper diaphragm.

[0008] In a joint structure configured in this manner, a pair of columns, each having a lower rectangular column and an upper rectangular column whose sides are on different planes and in a twisted position, intersect in an X-shape at an intersection along a vertical plane, and the joint section can be properly joined using a vertical steel plate, a lower diaphragm, an upper diaphragm, a first enclosure section, and a second enclosure section.

[0009] In the joint structure according to the present invention, the first enclosing portion and the second enclosing portion are formed by joining three rectangular steel plates together to form a C-shape in horizontal cross section.

[0010] In the joint structure configured in this manner, the first and second enclosure sections are made of three rectangular steel plates joined together to form a C-shape in horizontal cross section, making it easy to construct the first and second enclosure sections. [Effects of the Invention]

[0011] The joint structure according to the present invention can appropriately join a pair of adjacent upper and lower pillars whose side surfaces are on different planes and in twisted positions. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a perspective view showing a frame structure as an example in which a joint structure according to one embodiment of the present invention is installed. [Figure 2] This is an oblique view of columns joined with a joint structure. [Figure 3] This is a perspective view of columns joined with a joint structure rotated clockwise around the vertical axis from the state shown in Figure 2. [Figure 4] This is a perspective view of the columns joined with a joint structure rotated clockwise around the vertical axis from the state shown in Figure 3. [Figure 5] This is a perspective view of columns joined with a joint structure rotated clockwise around the vertical axis from the state shown in Figure 4. [Figure 6] FIG. 10 is a perspective view showing the vertical steel plate, lower flange, and upper flange of the joint structure. [Figure 7] FIG. 7 is an exploded perspective view of FIG. 6. [Figure 8] FIG. 10 is a perspective view of a column arranged on the other side of the vertical steel plate. [Figure 9] This is a perspective view of a column placed on one side of a vertical steel plate. DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, a joint structure according to one embodiment of the present invention will be described with reference to the drawings. As shown in Fig. 1, a frame structure 1 according to this embodiment is provided on the outer periphery of a structure (not shown) having a high-rise superstructure (hereinafter referred to as a "high-rise structure"). The high-rise structure to which the frame structure 1 is applied is an ultra-high-rise building or a super-high-rise base-isolated building having a height of over 300 m.

[0014] One horizontal direction of the frame structure 1 is the X direction, the other horizontal direction perpendicular to the X direction is the Y direction, and the direction perpendicular to the X and Y directions is the Z direction. The X and Y directions are the circumferential directions of the high-rise structure, and the Z direction is the height direction of the high-rise structure.

[0015] The frame structure 1 includes a beam structure 2 in which rectangular structures 22, each formed by combining beams 21 in the X and Y directions to form a rectangular shape in a plan view, are arranged at regular intervals in the Z direction. In this embodiment, the arrangement intervals of the rectangular structures 22 in the Z direction correspond to the height of each floor of the high-rise structure. Note that, depending on the frame plan of the high-rise structure, the arrangement is not limited to the above configuration, and for example, the rectangular structures 22 may be arranged on the periphery of the middle part of the first floor.

[0016] The frame structure 1 is provided with first diagonal columns 3 that are inclined from the vertical with respect to the beams 21 and second diagonal columns 4 that are inclined in a direction symmetrical to the first diagonal column 3 when viewed from the front with respect to the beams 21, between rectangular structures 22 that are arranged at regular intervals in the Z direction. Multiple first diagonal columns 3 and second diagonal columns 4 are arranged in parallel at predetermined intervals in the X direction or Y direction, respectively, and are provided around the entire periphery of the side of the beam structure 2. Multiple beams are joined to the first diagonal columns 3 and second diagonal columns 4.

[0017] The beam 21 is a known H-shaped steel. The first diagonal column 3 and the second diagonal column 4 are box columns made of known steel. However, depending on various conditions such as the strength required for the frame structure 1, the structure is not limited to the above configuration.

[0018] The beam 21, the first diagonal column 3, and the second diagonal column 4 are joined at their respective intersections. In this embodiment, the types of beams joined at each joint are not uniform, and for example, there is a configuration in which all three types of beams are joined at one joint, and there is also a configuration in which any two types of beams out of the three types are joined.

[0019] At the outer periphery of the frame structure 1, first diagonal columns 3, 3 adjacent in the X or Y direction and second diagonal columns 4, 4 adjacent in the same direction and in the same vertical plane are joined at each intersection to form a frame grid 10 having an external shape that resembles a diagonal lattice when viewed from the front.

[0020] Inside the frame structure 1, corners 15 of the frame structure 1 form arc corners 12 that are semi-R-shaped in plan view. Both inner and outer portions 21a and 21b of beams 21 that form arc corners 12 have an external shape that is arc-shaped in plan view. They are formed as arc frame grids 11 that have an external shape that is semi-R-shaped (semi-circular arc) in plan view.

[0021] The first diagonal columns 3 forming the structural grid 10 and the first diagonal columns 3 forming the arc structural grid 11 are provided continuously. The same applies to the second diagonal columns 4 forming the structural grid 10 and the arc structural grid 11, respectively.

[0022] Next, the joint structure 100 for joining the columns in the arc frame grid 11 will be described.

[0023] The following explanation will use the drawings to illustrate joint section A, where the first diagonal column 3 and the second diagonal column 4 intersect in an X-shape at a vertical intersection. As shown in Figure 2, in joint section A, the upper end of the first lower column 3A and the lower end of the first upper column 3B are spaced apart in the vertical direction. The upper end of the second lower column 4A and the lower end of the second upper column 4B are spaced apart in the vertical direction. The upper end of the first lower column 3A, the lower end of the first upper column 3B, the upper end of the second lower column 4A, and the lower end of the second upper column 4B are joined by a joint structure 100.

[0024] The first lower column 3A and the first upper column 3B are rectangular columns formed in the shape of a square tube. The first lower column 3A and the first upper column 3B have side surfaces on different planes and in twisted positions. The first lower column 3A and the first upper column 3B are in a twisted relationship, and the outer surfaces of the first lower column 3A and the first upper column 3B are not on the same plane. The axis of the first lower column 3A and the axis of the first upper column 3B are not on the same line or parallel to each other.

[0025] The side plate portions forming the outer surface of the first lower column 3A are referred to as the first to fourth side plate portions 31 to 34, respectively. The side plate portions forming the outer surface of the first upper column 3B are referred to as the first to fourth side plate portions 36 to 39, respectively. The side plate portions of the first lower column 3A and the side plate portions of the first upper column 3B that correspond to each other with a slight offset in the X and Y directions are referred to as the first side plate portion 31 and the first side plate portion 36, the second side plate portion 32 and the second side plate portion 37, the third side plate portion 33 and the third side plate portion 38, and the fourth side plate portion 34 and the fourth side plate portion 39. The first side plate portion 31 and the first side plate portion 36 are located on different planes and in twisted positions. The second side plate portion 32 and the second side plate portion 37 are located on different planes and in twisted positions. The third side surface plate portion 33 and the third side surface plate portion 38 are on different planes and are in twisted positions. The fourth side surface plate portion 34 and the fourth side surface plate portion 39 are on different planes and are in twisted positions.

[0026] The second lower column 4A and the second upper column 4B are rectangular columns formed in a rectangular tube shape. The second lower column 4A and the second upper column 4B have side surfaces on different planes and in twisted positions. The second lower column 4A and the second upper column 4B are in a twisted relationship, and the outer surfaces of the second lower column 4A and the second upper column 4B are not on the same plane. The axis of the second lower column 4A and the axis of the second upper column 4B are not on the same line or parallel to each other.

[0027] The side plate portions forming the outer surface of the second lower column 4A are referred to as the first to fourth side plate portions 41 to 44, respectively. The side plate portions forming the outer surface of the second upper column 4B are referred to as the first to fourth side plate portions 46 to 49, respectively. The side plate portions of the second lower column 4A and the second upper column 4B that correspond to each other with a slight offset in the X and Y directions are referred to as the first side plate portion 41 and the first side plate portion 46, the second side plate portion 42 and the second side plate portion 47, the third side plate portion 43 and the third side plate portion 48, and the fourth side plate portion 44 and the fourth side plate portion 49. The first side plate portion 41 and the first side plate portion 46 are located on different planes and in twisted positions. The second side plate portion 42 and the second side plate portion 47 are located on different planes and in twisted positions. The third side surface plate portion 43 and the third side surface plate portion 48 are on different planes and are in twisted positions. The fourth side surface plate portion 44 and the fourth side surface plate portion 49 are on different planes and are in twisted positions.

[0028] An inner diaphragm 3a is provided on the first upper column 3B. The inner diaphragm 3a has a generally rectangular flat plate shape. The outer edge of the inner diaphragm 3a is joined to the first to fourth side surface plate portions 36 to 39 by welding or the like. A through hole 3b is formed in the center of the inner diaphragm 3a.

[0029] An inner diaphragm 4a is provided on the second upper pillar 4B. The inner diaphragm 4a has a generally rectangular flat plate shape. The outer edge of the inner diaphragm 4a is joined to the first to fourth side surface plate portions 46 to 49 by welding or the like. A through hole 4b is formed in the center of the inner diaphragm 4a.

[0030] Similarly, internal diaphragms (not shown) are provided on the first lower column 3A and the second lower column 4A. The internal diaphragms provided on the first upper column 3B, the second upper column 4B, the first lower column 3A, and the second lower column 4A increase the rigidity of the first diagonal column 3 and the second diagonal column 4 in the out-of-plane direction.

[0031] At joint section A, the fourth side panel 34 of the first lower column 3A and the second side panel 42 of the second lower column 4A are arranged to face each other. The second side panel 37 of the first upper column 3B and the fourth side panel 49 of the second upper column 4B are arranged to face each other.

[0032] The joint structure 100 includes a vertical steel plate 5, a lower diaphragm 6, an upper diaphragm 7, a first enclosure 8, and a second enclosure 9.

[0033] The vertical steel plates 5 are arranged on an intersecting plane along the vertical plane. As shown in Fig. 6, the vertical steel plates 5 include a first vertical steel plate 51, a second vertical steel plate 52, and a third vertical steel plate 53. The first vertical steel plate 51, the second vertical steel plate 52, and the third vertical steel plate 53 are arranged on the same plane (intersecting plane) along the vertical plane.

[0034] As shown in Fig. 2, the first vertical steel plate 51 is disposed between the fourth side surface plate portion 34 of the first lower column 3A and the second side surface plate portion 42 of the second lower column 4A. The first vertical steel plate 51 is formed in a plate shape. The plate surface of the first vertical steel plate 51 faces the direction in which the fourth side surface plate portion 34 and the second side surface plate portion 42 face each other.

[0035] As shown in FIG. 9, the end 31a on the side of the fourth side face plate portion 34 at the upper part of the first side face plate portion 31 of the first lower column 3A is cut out along the first vertical steel plate 51. The end 33a on the side of the fourth side face plate portion 34 from the middle to the upper part of the third side face plate portion 33 in the vertical direction is cut out along the first vertical steel plate 51. The end 34a on the side of the fourth side face plate portion 34 from the middle to the upper part in the vertical direction is cut out along the first vertical steel plate 51. The end 31a of the first side face plate portion 31, the end 33a of the third side face plate portion 33, and the end 34a of the fourth side face plate portion 34 are joined to one surface 51a of the first vertical steel plate 51 (see FIG. 6) by welding or the like.

[0036] As shown in FIG. 8, the end 41a on the second side surface plate portion 42 side at the upper part of the first side surface plate portion 41 of the second lower column 4A is cut out along the first vertical steel plate 51. The end 42a from the middle to the upper part of the second side surface plate portion 42 in the vertical direction is cut out along the first vertical steel plate 51. The end 43a on the second side surface plate portion 42 side at the middle to the upper part of the third side surface plate portion 43 in the vertical direction is cut out along the first vertical steel plate 51. The end 41a of the first side surface plate portion 41, the end 42a of the second side surface plate portion 42, and the end 43a of the third side surface plate portion 43 are joined to the other surface 51b of the first vertical steel plate 51 (see FIG. 6) by welding or the like.

[0037] 2, the second vertical steel plate 52 is disposed above the first vertical steel plate 51. The plate surface of the second vertical steel plate 52 faces the same direction as the first vertical steel plate 51. A lower diaphragm 6, an upper diaphragm 7, a first enclosure 8, and a second enclosure 9, which will be described later, are joined to the second vertical steel plate 52.

[0038] The third vertical steel plate 53 is disposed between the second side surface plate portion 37 of the first upper column 3B and the fourth side surface plate portion 49 of the second upper column 4B. The third vertical steel plate 53 is formed in a plate shape. The plate surface of the third vertical steel plate 53 faces in the direction in which the second side surface plate portion 37 and the fourth side surface plate portion 49 face each other.

[0039] As shown in FIG. 8, the end 36a on the second side surface plate portion 37 side at the lower part of the first side surface plate portion 36 of the first upper column 3B is cut out along the third vertical steel plate 53. The end 37a of the second side surface plate portion 37 from the middle to the lower part in the vertical direction is cut out along the third vertical steel plate 53. The end 38a of the third side surface plate portion 38 from the middle to the lower part in the vertical direction on the second side surface plate portion 37 side is cut out along the third vertical steel plate 53. The end 36a of the first side surface plate portion 36, the end 37a of the second side surface plate portion 37, and the end 38a of the third side surface plate portion 38 are joined to one surface 53a of the third vertical steel plate 53 (see FIG. 6) by welding or the like.

[0040] As shown in FIG. 9, an end portion 46a on the fourth side surface plate portion 49 side at the lower portion of the first side surface plate portion 46 of the second upper column 4B is cut out along the third vertical steel plate 53. An end portion 48a on the fourth side surface plate portion 49 side at the middle to lower portion of the third side surface plate portion 48 in the vertical direction is cut out along the third vertical steel plate 53. An end portion 49a on the fourth side surface plate portion 49 at the middle to lower portion of the fourth side surface plate portion 49 in the vertical direction is cut out along the third vertical steel plate 53. The end portion 46a of the first side surface plate portion 46, the end portion 48a of the third side surface plate portion 48, and the end portion 49a of the fourth side surface plate portion 49 are joined to the other surface 53b of the third vertical steel plate 53 (see FIG. 6) by welding or the like.

[0041] As shown in FIG. 2, the lower diaphragm 6 is disposed above the first lower column 3A and the second lower column 4A. The lower diaphragm 6 is formed in a plate shape. The plate surface of the lower diaphragm 6 is disposed along a horizontal plane. As shown in FIG. 7, the lower diaphragm 6 has through holes 6a and 6b that penetrate in the vertical direction. The through hole 6a is located above the first lower column 3A. The through hole 6b is located above the second lower column 4A.

[0042] The upper end 31u of the first side panel portion 31, the upper end 32u of the second side panel portion 32, and the upper end 33u of the third side panel portion 33 of the first lower column 3A shown in FIG. 9 are joined by welding or the like to the outer edge of the lower surface 6d of the lower diaphragm 6 (see FIG. 7). The upper end 41u of the first side panel portion 41, the upper end 43u of the third side panel portion 43, and the upper end 44u of the fourth side panel portion 44 of the second lower column 4A shown in FIG. 8 are joined by welding or the like to the outer edge of the lower surface 6d of the lower diaphragm 6 (see FIG. 7). The upper end 51u of the first vertical steel plate 51 shown in FIG. 7 is joined by welding or the like to the lower surface 6d of the lower diaphragm 6. The lower end 52d of the second vertical steel plate 52 is joined by welding or the like to the upper surface 6u of the lower diaphragm 6.

[0043] As shown in FIG. 2, the upper diaphragm 7 is disposed below the first upper column 3B and the second upper column 4B. The upper diaphragm 7 is formed in a plate shape. The plate surface of the upper diaphragm 7 is disposed along a horizontal plane. As shown in FIG. 7, the upper diaphragm 7 has through holes 7a and 7b that penetrate in the vertical direction. The through hole 7a is located below the first lower column 3A. The through hole 7b is located below the second upper column 4B.

[0044] The lower end 36d of the first side panel portion 36, the lower end 38d of the third side panel portion 38, and the lower end 39d of the fourth side panel portion 39 of the first upper column 3B shown in FIG. 8 are joined by welding or the like to the outer edge of the upper surface 7u of the upper diaphragm 7 (see FIG. 7). The lower end 46d of the first side panel portion 46, the lower end 47d of the second side panel portion 47, and the lower end 48d of the third side panel portion 48 of the second upper column 4B shown in FIG. 9 are joined by welding or the like to the outer edge of the upper surface 7u of the upper diaphragm 7 (see FIG. 7). The upper end 52u of the second vertical steel plate 52 shown in FIG. 7 is joined by welding or the like to the lower surface 7d of the upper diaphragm 7. The lower end 53d of the third vertical steel plate 53 is joined by welding or the like to the upper surface 7u of the upper diaphragm 7.

[0045] The lower diaphragm 6 and upper diaphragm 7 increase the out-of-plane rigidity of the first diagonal column 3 and second diagonal column 4. The lower diaphragm 6 and upper diaphragm 7 bear the force acting in the out-of-plane direction on the first diagonal column 3 and second diagonal column 4 from the flange of the steel beam (H-shaped steel) connected to connection section A, and transmit it to the flange of the other steel beam (H-shaped steel) connected to connection section A.

[0046] As shown in Figure 2, a first enclosure 8 is arranged on one side of the vertical steel plate 5, and a second enclosure 9 is arranged on the other side. The first enclosure 8 is arranged on the side where the first lower column 3A and the second upper column 4B are located. The second enclosure 9 is arranged on the side where the first upper column 3B and the second lower column 4A are located.

[0047] As shown in Fig. 9, the first enclosure 8 has a C-shape in horizontal cross section. The first enclosure 8 has a first side panel 81, a second side panel 82, and a third side panel 83. The first side panel 81, the second side panel 82, and the third side panel 83 are arranged along a vertical plane. The first side panel 81, the second side panel 82, and the third side panel 83 are rectangular.

[0048] The first side surface plate 81 is disposed above the first side surface plate 31 of the first lower column 3A and below the first side surface plate 46 of the second upper column 4B. The second side surface plate 82 is disposed above the second side surface plate 32 of the first lower column 3A and below the second side surface plate 47 of the second upper column 4B. The third side surface plate 83 is disposed above the third side surface plate 33 of the first lower column 3A and below the third side surface plate 48 of the second upper column 4B.

[0049] Both widthwise ends of the second side surface plate portion 82 are joined by welding or the like to one widthwise end of the first side surface plate portion 81 and one widthwise end of the third side surface plate portion 83. The other widthwise end of the first side surface plate portion 81 and the other widthwise end of the third side surface plate portion 83 are joined by welding or the like to one surface 52a (see FIG. 7) of the second vertical steel plate 52. The first side surface plate portion 81, the second side surface plate portion 82, the third side surface plate portion 83 and the second vertical steel plate 52 form a tubular shape that is rectangular in horizontal cross section.

[0050] A lower end 81d of the first side surface plate portion 81, a lower end 82d of the second side surface plate portion 82, and a lower end 83d of the third side surface plate portion 83 are joined by welding or the like to the outer edge of an upper surface 6u (see FIG. 7) of the lower diaphragm 6. An upper end 81u of the first side surface plate portion 81, an upper end 82u of the second side surface plate portion 82, and an upper end 83u of the third side surface plate portion 83 are joined by welding or the like to the outer edge of a lower surface 7d of the upper diaphragm 7 (see FIG. 7).

[0051] As shown in Fig. 8, the second enclosure 9 has a C-shape in horizontal cross section. The second enclosure 9 has a first side panel 91, a second side panel 92, and a third side panel 93. The first side panel 91, the second side panel 92, and the third side panel 93 are rectangular. The first side panel 91, the second side panel 92, and the third side panel 93 are arranged along a vertical plane.

[0052] The first side surface plate 91 is disposed below the first side surface plate 36 of the first upper column 3B and above the first side surface plate 41 of the second lower column 4A. The second side surface plate 92 is disposed below the fourth side surface plate 39 of the first upper column 3B and above the fourth side surface plate 44 of the second lower column 4A. The third side surface plate 93 is disposed below the third side surface plate 38 of the first upper column 3B and above the third side surface plate 43 of the second lower column 4A.

[0053] Both widthwise ends of the second side surface plate portion 92 are joined by welding or the like to one widthwise end of the first side surface plate portion 91 and one widthwise end of the third side surface plate portion 93. The other widthwise end of the first side surface plate portion 91 and the other widthwise end of the third side surface plate portion 93 are joined by welding or the like to the other surface 52b (see FIG. 7) of the second vertical steel plate 52. The first side surface plate portion 91, the second side surface plate portion 92, the third side surface plate portion 33 and the second vertical steel plate 52 form a tubular shape that is rectangular in horizontal cross section.

[0054] A lower end 91d of the first side plate portion 91, a lower end 92d of the second side plate portion 92, and a lower end 93d of the third side plate portion 93 are joined by welding or the like to the outer edge of an upper surface 6u (see FIG. 7) of the lower diaphragm 6. An upper end 91u of the first side plate portion 91, an upper end 92u of the second side plate portion 92, and an upper end 93u of the third side plate portion 93 are joined by welding or the like to the outer edge of a lower surface 7d of the upper diaphragm 7 (see FIG. 7).

[0055] Concrete is filled inside the first lower column 3A, first upper column 3B, second lower column 4A, second upper column 4B, first enclosure 8, and second enclosure 9 through the through-hole 3b of the inner diaphragm 3a of the first upper column 3B, the through-hole 4b of the inner diaphragm 4a of the second upper column 4B, the through-holes 6a and 6b of the lower diaphragm 6, and the through-holes 7a and 7b of the upper diaphragm 7. Note that concrete does not have to be filled inside.

[0056] In the joint structure 100 constructed in this manner, a first diagonal column 3 having a first lower rectangular column 3A and a first upper rectangular column 3B whose side surfaces are on different planes and in a twisted position, and a second diagonal column 4 having a second lower rectangular column 4A and a second upper rectangular column 4B whose side surfaces are on different planes and in a twisted position, intersect in an X shape at an intersection plane along a vertical plane. The joint section A can be appropriately joined by a vertical steel plate 5, a lower diaphragm 6, an upper diaphragm 7, a first enclosure section 8, and a second enclosure section 9.

[0057] The first enclosing section 8 is made up of three rectangular plates, a first side panel 81, a second side panel 82, and a third side panel 83, joined together to form a C-shape in horizontal cross section. The second enclosing section 9 is made up of three rectangular plates, a first side panel 91, a second side panel 92, and a third side panel 93, joined together to form a C-shape in horizontal cross section. This makes it easy to install the first enclosing section 8 and the second enclosing section 9.

[0058] Although one embodiment of the joint structure according to the present invention has been described above, the present invention is not limited to the above embodiment and can be modified as appropriate within the scope of the spirit thereof.

[0059] For example, in the above embodiment, the joint structure 100 was described as joining the first diagonal column 3 and the second diagonal column 4 installed in the frame structure 1, but the present invention is not limited to this. The joint structure 100 can also be applied to a joint in other frames where a pair of columns, each having a lower column and an upper column of a square column whose side faces are on different planes and in twisted positions, intersect in an X-shape at an intersection plane along a vertical plane. [Explanation of symbols]

[0060] 3A 1st lower column (lower column) 3B 1st upper column (upper column) 4A 2nd lower column (lower column) 4B Second upper pillar (upper pillar) 5 Vertical steel plate 6 Lower diaphragm 7 Upper diaphragm 8 First enclosure 9 Second enclosure 81 First side plate (steel plate) 82 Second side plate (steel plate) 83 Third side plate part (steel plate) 91 First side plate (steel plate) 92 Second side plate (steel plate) 93 Third side plate part (steel plate) 100 Joint structure A Joint

Claims

[Claim 1] A joint structure of a joint part in which a pair of columns, each having a lower column and an upper column of a square column whose side surfaces are on different planes and in a twisted position, intersect in an X-shape at an intersection plane along a vertical plane, A vertical steel plate disposed on the intersecting plane and joined to the pair of columns; a lower diaphragm disposed along a horizontal plane and joined to an upper end of the lower pillar of the pair of pillars; an upper diaphragm disposed along a horizontal plane and joined to a lower end of the upper column of the pair of columns; a first enclosure portion disposed along a vertical plane on one side of the vertical steel plate and joined to the vertical steel plate, the lower diaphragm, and the upper diaphragm; a second enclosure portion disposed along a vertical plane on the other side of the vertical steel plate and joined to the vertical steel plate, the lower diaphragm, and the upper diaphragm, The first and second enclosures have a joint structure in which three rectangular steel plates are joined to form a C-shape in horizontal cross section.

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