Joint materials

Abstract

To provide a connection member capable of properly joining a top pillar and a bottom pillar sides thereof are on different planes and twisted.SOLUTION: A connection member 100 is a connection member for joining a bottom pillar 4A and a top pillar 4B of a square column with sides thereof positioned on different planes and twisted. The connection member includes: a lower diaphragm part 6 along a horizontal plane and joined to the bottom pillar 4A; an upper diaphragm part 7 along the horizontal plane and joined to the top pillar 4B; and an enclosing portion 8 that closes between outer edges 61, 62, 64 of the lower diaphragm portion 6 and outer edges 71, 72, 74 of the upper diaphragm portion. The lower diaphragm portion 6, the upper diaphragm portion 7, and the surrounding portion 8 are integrally molded, and an inside thereof is formed hollow.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a joint member. [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 joints (joints) between columns where the sides of the upper and lower columns are on different planes and in twisted positions are extremely complex to fit, which presents a problem in that they are difficult to construct.

[0006] In view of the above circumstances, the present invention provides a joint member that can properly join upper and lower pillars whose side surfaces are on different planes and in twisted positions. [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 member of the present invention is a joint member that joins a lower column and an upper column of a square column whose side surfaces are on different planes and in a twisted position, and comprises a lower diaphragm portion that runs along a horizontal plane and is joined to the lower column, an upper diaphragm portion that runs along the horizontal plane and is joined to the upper column, and an enclosure portion that blocks the space between the outer edge of the lower diaphragm portion and the outer edge of the upper diaphragm portion, and the lower diaphragm portion, the upper diaphragm portion and the enclosure portion are molded integrally and are hollow inside.

[0008] The joint member constructed in this manner joins a lower column and an upper column of a rectangular column whose side surfaces are on different planes and in a twisted position. The lower diaphragm portion of the joint member is joined to the lower column, the upper diaphragm portion is joined to the upper column, and the surrounding portion closes the gap between the outer edges of the lower diaphragm portion and the upper diaphragm portion. The lower diaphragm portion, upper diaphragm portion, and surrounding portion are molded as a single unit and are hollow inside. Therefore, because the upper and lower columns are joined via the integrally molded joint member, the joint can be properly joined even when the upper and lower columns have side surfaces on different planes and in a twisted position.

[0009] In addition, in the joint member of the present invention, each side surface of the joint member may have a first triangular surface portion that forms an approximately upward triangle and a second triangular surface portion that forms an approximately downward triangle, and the lower edge of the first triangular surface portion may be connected to the lower diaphragm portion, and the upper edge of the second triangular surface portion may be connected to the upper diaphragm portion.

[0010] In a joint member configured in this manner, each side surface is formed by connecting the lower edge of the first triangular surface portion, which forms a roughly upward triangle, to the lower diaphragm portion, and connecting the upper edge of the second triangular surface portion, which forms a roughly downward triangle, to the upper diaphragm portion. Therefore, each side surface of the joint member has a mechanically stable shape due to the first triangular surface portion and the second triangular surface portion, which form a roughly triangle. [Effects of the Invention]

[0011] The joint member according to the present invention can appropriately join 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 member according to one embodiment of the present invention is installed. [Figure 2] This is an oblique view of columns joined with joint members. [Figure 3] FIG. 1 is a first side view of columns joined with joint members. [Figure 4] This is a second side view of the columns joined with joint members, rotated 90 degrees clockwise around the vertical axis from the state shown in Figure 3. [Figure 5] This is a third side view of the columns joined with joint members, rotated 90 degrees clockwise around the vertical axis from the state shown in Figure 4. [Figure 6] This is a fourth side view of the columns joined with joint members, rotated 90 degrees clockwise around the vertical axis from the state shown in Figure 5. [Figure 7] FIG. 2 is a perspective view of a joint member according to one embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, a joint member 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 members 100 that join the columns together in the arc frame grid 11 will be described.

[0023] The following explanation will be given using the drawings to illustrate the joint A between the second diagonal columns 4, but the joints between the first diagonal columns 3 are symmetrical when viewed from the front, and so will not be explained here. As shown in Figure 2, at the joint A between the second diagonal columns 4, the upper end of the lower column 4A and the lower end of the upper column 4B are spaced apart in the vertical direction. The upper end of the lower column 4A and the lower end of the upper column 4B are joined via a joint member 100.

[0024] The lower column 4A and the upper column 4B are rectangular columns formed in the shape of a square tube. The side surfaces of the lower column 4A and the upper column 4B are on different planes and are in twisted positions. The lower column 4A and the upper column 4B are in a twisted relationship, and the outer surfaces of the lower column 4A and the upper column 4B are not on the same plane. The axis O1 of the lower column 4A (see Figure 3) and the axis O2 of the upper column 4B (see Figure 3) are not on the same line and are not parallel.

[0025] The side plate portions forming the outer surface of the 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 upper column 4B are referred to as the first to fourth side plate portions 51 to 54, respectively. The side plate portions of the lower column 4A and the side plate portions of the 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 51, the second side plate portion 42 and the second side plate portion 52, the third side plate portion 43 and the third side plate portion 53, and the fourth side plate portion 44 and the fourth side plate portion 54. The first side plate portion 41 and the first side plate portion 51 are located on different planes and in twisted positions. The second side plate portion 42 and the second side plate portion 52 are located on different planes and in twisted positions. The third side surface plate portion 43 and the third side surface plate portion 53 are on different planes and are in twisted positions. The fourth side surface plate portion 44 and the fourth side surface plate portion 54 are on different planes and are in twisted positions.

[0026] The connection member 100 includes a lower diaphragm portion 6, an upper diaphragm portion 7, and an enclosure portion 8. The lower diaphragm portion 6, the upper diaphragm portion 7, and the enclosure portion 8 are integrally molded. In this embodiment, the connection member 100 is integrally molded by casting.

[0027] As shown in FIG. 7, the lower diaphragm portion 6 is formed in a flat plate shape. The plate surface of the lower diaphragm portion 6 is arranged along a horizontal plane. The lower diaphragm portion 6 has a rectangular shape in a plan view. As shown in FIG. 2, the lower diaphragm portion 6 has a rectangular shape that is slightly larger than the rectangle formed by the upper end surface of the lower pillar 4A. In other words, the outer peripheral end surface of the lower diaphragm portion 6 protrudes outward beyond the lower pillar 4A.

[0028] As shown in FIG. 3 , among the outer edges of the lower diaphragm portion 6, the outer edges on the side of the first side panel portion 41 of the lower column 4A and the side of the first side panel portion 51 of the upper column 4B are referred to as first outer edges 61. As shown in FIG. 4 , among the outer edges of the lower diaphragm portion 6, the outer edges on the side of the second side panel portion 42 of the lower column 4A and the side of the second side panel portion 52 of the upper column 4B are referred to as second outer edges 62. As shown in FIG. 5 , among the outer edges of the lower diaphragm portion 6, the outer edges on the side of the third side panel portion 43 of the lower column 4A and the side of the third side panel portion 53 of the upper column 4B are referred to as third outer edges 63. As shown in FIG. 6 , among the outer edges of the lower diaphragm portion 6, the outer edges on the side of the fourth side panel portion 44 of the lower column 4A and the side of the fourth side panel portion 54 of the upper column 4B are referred to as fourth outer edges 64.

[0029] As shown in FIG. 7, the upper diaphragm portion 7 is formed in a flat plate shape. The plate surface of the upper diaphragm portion 7 is arranged along a horizontal plane. The upper diaphragm portion 7 is rectangular in plan view. The shape and size of the upper diaphragm portion 7 are substantially the same as the shape and size of the lower diaphragm portion 6. As shown in FIG. 2, the upper diaphragm portion 7 is rectangular in shape and is slightly larger than the rectangle formed by the lower end surface of the upper pillar 4B. In other words, the outer peripheral end surface of the upper diaphragm portion 7 protrudes outward beyond the upper pillar 4B.

[0030] As shown in FIG. 3 , among the outer edges of the upper diaphragm portion 7, the outer edges on the side of the first side face plate 41 of the lower column 4A and the side of the first side face plate 51 of the upper column 4B are referred to as first outer edges 71. As shown in FIG. 4 , among the outer edges of the upper diaphragm portion 7, the outer edges on the side of the second side face plate 42 of the lower column 4A and the side of the second side face plate 52 of the upper column 4B are referred to as second outer edges 72. As shown in FIG. 5 , among the outer edges of the upper diaphragm portion 7, the outer edges on the side of the third side face plate 43 of the lower column 4A and the side of the third side face plate 53 of the upper column 4B are referred to as third outer edges 73. As shown in FIG. 6 , among the outer edges of the upper diaphragm portion 7, the outer edges on the side of the fourth side face plate 44 of the lower column 4A and the side of the fourth side face plate 54 of the upper column 4B are referred to as fourth outer edges 74.

[0031] 7, the enclosure 8 closes the gap between the first to fourth outer edge portions 61 to 64 of the lower diaphragm portion 6 and the first to fourth outer edge portions 71 to 74 of the upper diaphragm portion 7. The outer peripheral end faces of the first to fourth outer edge portions 61 to 64 of the lower diaphragm portion 6 and the outer peripheral end faces of the first to fourth outer edge portions 71 to 74 of the upper diaphragm portion 7 protrude slightly outward from the enclosure 8. The enclosure 8 has a first enclosure portion 80a, a second enclosure portion 80b (see FIG. 4), a third enclosure portion 80c (see FIG. 5), and a fourth enclosure portion 80d.

[0032] The first enclosure 80a connects the first outer edge 61 of the lower diaphragm portion 6 and the first outer edge 71 of the upper diaphragm portion 7. As shown in FIG. 4, the second enclosure 80b connects the second outer edge 62 of the lower diaphragm portion 6 and the second outer edge 72 of the upper diaphragm portion 7. As shown in FIG. 5, the third enclosure 80c connects the third outer edge 63 of the lower diaphragm portion 6 and the third outer edge 73 of the upper diaphragm portion 7. As shown in FIG. 6, the fourth enclosure 80d connects the fourth outer edge 64 of the lower diaphragm portion 6 and the fourth outer edge 74 of the upper diaphragm portion 7.

[0033] The outer surfaces (side surfaces) of the first to fourth surrounding portions 80a to 80d are each formed by combining an upward-facing triangular surface (first triangular surface) that forms an upward triangle and a downward-facing triangular surface (second triangular surface) that forms a downward triangle. Here, an upward-facing triangle is a shape in which one side (bottom side) is located on the bottom and the vertex opposite that side is located on the top. A downward-facing triangle is a shape in which one side (top side) is located on the top and the vertex opposite that side is located on the bottom.

[0034] As shown in FIG. 3 , the outer surface of the first enclosure 80a has an upwardly facing triangular surface 81a and a downwardly facing triangular surface 81b. When viewed from the front, the upwardly facing triangular surface 81a is located to the left of the downwardly facing triangular surface 81b. A lower side 811 of the upwardly facing triangular surface 81a is connected to the first outer edge 61 of the lower diaphragm 6. A vertex 814 opposite the lower side 811 of the upwardly facing triangular surface 81a is connected to the left end of the first outer edge 71 of the upper diaphragm 7. An upper side 816 of the downwardly facing triangular surface 81b is connected to the first outer edge 71 of the upper diaphragm 7. A vertex 819 opposite the upper side 816 of the downwardly facing triangular surface 81b is connected to the right end of the first outer edge 61 of the lower diaphragm 6. Side 812 of upward triangular surface portion 81a and side 817 of downward triangular surface portion 81b are connected. Upward triangular surface portion 81a and downward triangular surface portion 81b are not on the same plane. The outer surface of first enclosure portion 80a is bent at sides 812 and 817.

[0035] As shown in FIG. 4 , the outer surface of the second enclosure 80b has an upward triangular surface 82a and a downward triangular surface 82b. When viewed from the front, the upward triangular surface 82a is located to the left of the downward triangular surface 82b. A lower side 821 of the upward triangular surface 82a is connected to the second outer edge 62 of the lower diaphragm 6. A vertex 824 opposite the lower side 821 of the upward triangular surface 82a is connected to the left end of the second outer edge 72 of the upper diaphragm 7. A side 823 of the upward triangular surface 82a is connected to a side 818 of the downward triangular surface 81b of the first enclosure 80a. An upper side 826 of the downward triangular surface 82b is connected to the second outer edge 72 of the upper diaphragm 7. A vertex 829 opposite to an upper side 826 of the downward-facing triangular surface portion 82b is connected to the right end of the second outer edge portion 62 of the lower diaphragm portion 6. Side 822 of the upward-facing triangular surface portion 82a and side 827 of the downward-facing triangular surface portion 82b are connected. The upward-facing triangular surface portion 82a and the downward-facing triangular surface portion 82b are not on the same plane. The outer surface of the second enclosure portion 80b is bent at sides 822 and 827.

[0036] As shown in FIG. 5 , the outer surface of the third enclosure 80c has an upward triangular surface 83a and a downward triangular surface 83b. When viewed from the front, the upward triangular surface 83a is located to the left of the downward triangular surface 83b. A lower edge 831 of the upward triangular surface 83a is connected to the third outer edge 63 of the lower diaphragm 6. A vertex 834 opposite the lower edge 831 of the upward triangular surface 83a is connected to the left end of the third outer edge 73 of the upper diaphragm 7. A side 833 of the upward triangular surface 83a is connected to a side 828 of the downward triangular surface 82b of the second enclosure 80b. An upper edge 836 of the downward triangular surface 83b is connected to the third outer edge 73 of the upper diaphragm 7. A vertex 839 opposite to an upper side 836 of the downward triangular surface portion 83b is connected to the right end of the third outer edge portion 63 of the lower diaphragm portion 6. A side 832 of the upward triangular surface portion 83a and a side 837 of the downward triangular surface portion 83b are connected. The upward triangular surface portion 83a and the downward triangular surface portion 83b are not on the same plane. The outer surface of the third enclosure portion 80c has a bent shape at the sides 832 and 837.

[0037] As shown in FIG. 6 , the outer surface of the fourth enclosure 80d has an upward triangular surface 84a and a downward triangular surface 84b. When viewed from the front, the upward triangular surface 84a is located to the left of the downward triangular surface 84b. A lower edge 841 of the upward triangular surface 84a is connected to the fourth outer edge 64 of the lower diaphragm 6. A vertex 844 opposite the lower edge 841 of the upward triangular surface 84a is connected to the left end of the fourth outer edge 74 of the upper diaphragm 7. A side 843 of the upward triangular surface 84a is connected to a side 838 of the downward triangular surface 83b of the third enclosure 80c. An upper edge 846 of the downward triangular surface 84b is connected to the fourth outer edge 74 of the upper diaphragm 7. A vertex 849 opposite to the upper side 846 of the downward triangular surface portion 84b is connected to the right end of the fourth outer edge portion 64 of the lower diaphragm portion 6. A side 842 of the upward triangular surface portion 84a is connected to a side 847 of the downward triangular surface portion 84b. A side 848 of the downward triangular surface portion 84b is connected to a side 813 of the upward triangular surface portion 81a of the first enclosure portion 80a. The upward triangular surface portion 84a and the downward triangular surface portion 84b are not on the same plane. The outer surface of the fourth enclosure portion 80d has a bent shape at the sides 842 and 847.

[0038] As shown in Figure 7, the interior of the enclosure 8 is hollow and has a through-hole 86 that penetrates in the vertical direction. A substantially elliptical opening 66 is formed in approximately the center of the lower diaphragm portion 6. A substantially elliptical opening 76 is formed in approximately the center of the upper diaphragm portion 7. The openings 66, 76 are circular. Since the centers of the lower diaphragm portion 6 and the upper diaphragm portion 7 are positioned at offset positions in the X and Y directions, the openings 66 and 76 are also positioned at offset positions in the X and Y directions. The through-hole 86 has a cylindrical shape that is inclined with respect to the Z direction.

[0039] As shown in Fig. 2, the lower surface of the lower diaphragm portion 6 is joined to the upper end surface of the lower column 4A by welding or the like. The upper surface of the upper diaphragm portion 7 is joined to the lower end surface of the upper column 4B by welding or the like.

[0040] A pair of beams 21A, 21B are joined to the joint member 100. As shown in Fig. 4, the second outer edge portion 62 of the lower diaphragm portion 6 is joined to the lower flange 23 of one beam 21A by welding or the like. The upward triangular surface portion 82a and the downward triangular surface portion 82b are joined to the flange 24 of the beam 21A by welding or the like. The second outer edge portion 72 of the upper diaphragm portion 7 is joined to the upper flange 25 of the beam 21A by welding or the like.

[0041] As shown in Fig. 6, the fourth outer edge portion 64 of the lower diaphragm portion 6 is joined to the lower flange 26 of the other beam 21B by welding or the like. The upward triangular surface portion 84a and the downward triangular surface portion 84b are joined to the flange 27 of the beam 21B by welding or the like. The fourth outer edge portion 74 of the upper diaphragm portion 7 is joined to the upper flange 28 of the beam 21B by welding or the like.

[0042] Concrete (not shown) is filled inside the through holes 86 of the lower column 4A, the upper column 4B, and the joint member 100. Note that the through holes 86 of the lower column 4A, the upper column 4B, and the joint member 100 do not necessarily have to be filled with concrete.

[0043] The joint member 100 configured in this manner joins a lower column 4A and an upper column 4B of a rectangular pillar whose side surfaces are on different planes and in a twisted position. The lower diaphragm portion 6 of the joint member 100 is joined to the lower column 4A, and the upper diaphragm portion 7 is joined to the upper column 4B, and the surrounding portion 8 closes the gap between the first to fourth outer edge portions 61 to 64 of the lower diaphragm portion 6 and the first to fourth outer edge portions 71 to 74 of the upper diaphragm portion 7. The lower diaphragm portion 6, the upper diaphragm portion 7, and the surrounding portion 8 are molded integrally and are hollow. Therefore, because the upper and lower columns 4A and 4B are joined via the integrally molded joint member 100, the joint between the upper column 4B and the lower column 4A whose side surfaces are on different planes and in a twisted position can be properly joined.

[0044] Each side of the joint member 100 is configured such that the lower sides 811, 821, 831, and 841 of the upward triangular surface portions 81a to 84a, which form a roughly upward triangle, are connected to the lower diaphragm portion 6, and the upper sides 816, 826, 836, and 846 of the downward triangular surface portions 81b to 84b, which form a roughly downward triangle, are connected to the upper diaphragm portion 7. Therefore, each side of the joint member 100 has a mechanically stable shape due to the upward triangular surface portions 81a to 84a and the downward triangular surface portions 81b to 84b, which form a roughly triangle.

[0045] Although one embodiment of the joint member 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 of the present invention.

[0046] For example, in the above embodiment, the joint member 100 was described as joining the lower column 4A and the upper column 4B installed in the frame structure 1, but the present invention is not limited to this. The joint member 100 can also be applied to other frames when joining the lower column and the upper column of a square column whose side faces are on different planes and in twisted positions.

[0047] In the embodiment described above, each of the four side surfaces of the joint member 100 has a first triangular surface portion that forms an upward triangle and a second triangular surface portion that forms a downward triangle, but the present invention is not limited to this. The first triangular surface portion and the second triangular surface portion may each be approximately triangular, and the first triangular surface portion and the second triangular surface portion may each be curved rather than flat.

[0048] In the above embodiment, the through hole 86 of the joint member 100 is cylindrical, but the present invention is not limited to this. As long as the inside of the joint member 100 is hollow, the shape of the through hole can be set appropriately, and the through hole may be polygonal in plan view. [Explanation of symbols]

[0049] 4A Lower column 4B Upper pillar 6 Lower diaphragm part 7 Upper diaphragm part 8 Enclosure part 81a Upward triangular surface part (first triangular surface part) 81b Downward triangular surface part (second triangular surface part) 82a Upward triangular surface part (first triangular surface part) 82b Downward triangular surface part (second triangular surface part) 83a Upward triangular surface part (first triangular surface part) 83b Downward triangular surface part (second triangular surface part) 84a Upward triangular surface part (first triangular surface part) 84b Downward triangular surface part (second triangular surface part) 100 Mouth member

Claims

1. A joint member for joining a lower pillar and an upper pillar of a rectangular pillar whose side surfaces are on different planes and in a twisted position, a lower diaphragm portion that is joined to the lower column along a horizontal plane; an upper diaphragm portion that is joined to the upper column along a horizontal plane; an enclosure portion that closes the gap between the outer edge of the lower diaphragm portion and the outer edge of the upper diaphragm portion, Each side surface of the connection member is a first triangular surface portion that forms a substantially upward triangle and a second triangular surface portion that forms a substantially downward triangle, a lower side of the first triangular surface portion is connected to the lower diaphragm portion, The upper side of the second triangular surface portion is a joint member connected to the upper diaphragm portion.

2. A joint member as described in Claim 1, wherein the enclosure portion is molded integrally with the lower diaphragm portion and the upper diaphragm portion.

3. A joint member as described in Claim 1, wherein the lower diaphragm portion, the upper diaphragm portion and the enclosure portion are molded integrally and the interior is formed hollow.

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