Joint structure of angle steel pipe column

Abstract

To provide a joint structure preventing drop in strength by changing thickness on a column base side and a column head side at a rational place of a steel pipe column.SOLUTION: A joint structure of a steel pipe column includes a first diaphragm disposed on one end of a first steel pipe column, a flange connected to the first diaphragm so that a flange face is disposed in substantially parallel with a material axis direction of the first steel pipe column, a second diaphragm disposed on one end of a second steel pipe column, a flange connected to the second diaphragm so that a flange face is disposed in substantially parallel with a material axis of the second steel pipe column, and a doubling plate. The column diameter of the first steel pipe column is larger than the column diameter of the second steel pipe column. The second steel pipe column is disposed on the first steel pipe column so that the first diaphragm and the second diaphragm face each other. The first steel pipe column is connected to a first beam. The second steel pipe column is connected to a second beam. The flange connected to the first diaphragm and the flange connected to the second diaphragm have a bolt joint part at which these flanges are connected with bolts through the doubling plate. The bolt joint part is disposed between the first beam and the second beam.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] One embodiment of the present invention relates to a joint structure of a steel pipe column used for a building.

Background Art

[0002] At a construction site of a building, welding and bolt joining are used as methods for joining steel members. Welding can, in principle, ensure sufficient strength, but it requires a high level of skill and working time, and the joining strength is affected by the skill of the worker. On the other hand, bolt joining has the advantages of shortening the construction period, being less affected by the skill of the worker, and being easy to perform quality control. There are various bolt joining methods, for example, a method of joining a steel pipe column and an H-shaped steel, and a method of joining steel pipe columns are disclosed (see Patent Documents 1 and 2).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] When bolt-joining steel members, it is possible to easily perform bolt joining for members having a released cross-sectional shape such as an H-shaped steel. However, when connecting tubular members such as square steel pipe columns by bolt joining, there is a problem that the construction is not easy because they have a closed cross-sectional shape. In addition, it is also conceivable to process a part of the steel pipe column in order to facilitate the bolt joining construction, but there is a concern that the strength of the joint portion may be reduced thereby.

[0005] When it is desired to change the thickness of the steel pipe column on the column base side and the column head side, switching is performed at the same height as the beam. However, in such a structure, the column head becomes thicker than necessary, and when a horizontal force is generated due to an earthquake or the like, the bending stress generated at the column head and the column base may be different. In addition, the thickness required on the column base side is often made constant up to the column head side, resulting in a column that is thicker than necessary on the column head side and an unreasonable state.

[0006] Therefore, one object of the present invention is to provide a joint structure that changes the thickness of the column base side and the column head side at a reasonable position of the steel pipe column while not reducing the strength.

Means for Solving the Problems

[0007] The joint structure of a steel pipe column according to an embodiment of the present invention includes a first diaphragm provided at one end of a first steel pipe column, a first flange and a second flange whose flange surfaces are arranged substantially parallel to the material axis direction of the first steel pipe column and joined to the first diaphragm, a second diaphragm provided at one end of a second steel pipe column, a third flange and a fourth flange whose flange surfaces are arranged substantially parallel to the material axis direction of the second steel pipe column and joined to the second diaphragm, a first backing plate, and a second backing plate. The second steel pipe column is arranged on the first steel pipe column so that the first diaphragm and the second diaphragm face each other. The first steel pipe column is thicker than the second steel pipe column. The flange surfaces of the first flange and the third flange are directed in a first direction, the flange surfaces of the second flange and the fourth flange are directed in a second direction intersecting the first direction, one side of the first flange and one side of the second flange are adjacent and spaced apart, one side of the third flange and one side of the fourth flange are adjacent and spaced apart, the flange surfaces of the first flange and the third flange are arranged flush and bolted together via the first backing plate, the flange surfaces of the second flange and the fourth flange are arranged flush and bolted together via the second backing plate.

[0008] The joint structure of a steel pipe column according to an embodiment of the present invention includes a first diaphragm provided at one end of a first steel pipe column, a first flange having bolt holes and a first through hole with a flange surface arranged substantially parallel to the material axis direction of the first steel pipe column and joined to the first diaphragm, a second flange having bolt holes and no through hole, a second diaphragm provided at one end of a second steel pipe column, a third flange having bolt holes and a second through hole with a flange surface arranged substantially parallel to the material axis direction of the second steel pipe column and joined to the second diaphragm, a fourth flange having bolt holes and no through hole, a first attachment plate, and a second attachment plate. The second steel pipe column is arranged on the first steel pipe column such that the first diaphragm and the second diaphragm face each other. The first steel pipe column is thicker than the second steel pipe column. The flange surfaces of the first flange and the third flange are directed in a first direction, the flange surfaces of the second flange and the fourth flange are directed in a second direction intersecting the first direction. The first flange and the second flange are adjacent to each other, the third flange and the fourth flange are adjacent to each other. The flange surface of the first flange and the flange surface of the fourth flange are arranged flush and bolted together via the first attachment plate. The flange surface of the second flange and the flange surface of the third flange are arranged flush and bolted together via the second attachment plate.

[0009] The joint structure of a steel pipe column according to an embodiment of the present invention includes a first diaphragm provided at one end of a first steel pipe column, a first L-shaped flange and a second L-shaped flange whose flange surfaces are arranged parallel to the material axis direction of the first steel pipe column and are joined to the first diaphragm, a second diaphragm provided at one end of a second steel pipe column, a third L-shaped flange and a fourth L-shaped flange whose flange surfaces are arranged parallel to the material axis direction of the second steel pipe column and are joined to the second diaphragm, a first backing plate and a second backing plate. The second steel pipe column is arranged on the first steel pipe column such that the first diaphragm and the second diaphragm face each other. The first steel pipe column is thicker than the second steel pipe column. The first L-shaped flange and the second L-shaped flange are arranged separately. The third L-shaped flange and the fourth L-shaped flange are arranged separately. The flange surfaces of the first L-shaped flange and the third L-shaped flange are flush with each other. The flange surfaces of the second L-shaped flange and the fourth L-shaped flange are flush with each other. The first L-shaped flange and the third L-shaped flange are bolted together via the first backing plate. The second L-shaped flange and the fourth L-shaped flange are bolted together via the second backing plate.

[0010] The joint structure of a steel pipe column according to an embodiment of the present invention includes a first diaphragm provided at one end of a first steel pipe column, a flange surface arranged parallel to the material axis direction of the first steel pipe column, and a first groove-shaped flange and a second groove-shaped flange joined to the first diaphragm and bent in a groove shape at both ends in the same direction, a second diaphragm provided at one end of a second steel pipe column, a flange surface arranged parallel to the material axis direction of the second steel pipe column, and a third groove-shaped flange and a fourth groove-shaped flange joined to the second diaphragm and bent in a groove shape at both ends in the same direction, and a first filler plate and a second filler plate. The second steel pipe column is arranged on the first steel pipe column such that the first diaphragm and the second diaphragm face each other. The first steel pipe column is thicker than the second steel pipe column. The bent ends of the first groove-shaped flange and the second groove-shaped flange are spaced apart and arranged opposite to each other. The bent ends of the third groove-shaped flange and the fourth groove-shaped flange are spaced apart and arranged opposite to each other. The direction in which the first groove-shaped flange and the second groove-shaped flange face each other is different from the direction in which the third groove-shaped flange and the fourth groove-shaped flange face each other. The flange surfaces of the first groove-shaped flange and the third groove-shaped flange are flush with each other. The flange surfaces of the second groove-shaped flange and the fourth groove-shaped flange are flush with each other. The first groove-shaped flange and the third groove-shaped flange are bolted together via the first filler plate. The second groove-shaped flange and the fourth groove-shaped flange are bolted together via the second filler plate.

[0011] In one embodiment of the present invention, it is preferable that the first diaphragm is thicker than the second diaphragm.

Advantages of the Invention

[0012] According to one embodiment of the present invention, steel pipe columns of different thicknesses can be connected in the middle of a floor. Thereby, the column base side can be made thick and strong, the column head side can be made thin to reduce weight, save materials, and save space, and a structure suitable for a column head portion with a small bending moment can be obtained.

Brief Description of the Drawings

[0013]

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Embodiments for Carrying Out the Invention

[0014] Hereinafter, the content of the embodiments of the present invention will be described with reference to the drawings and the like. However, the present invention includes many different aspects and is not to be construed as being limited to the content of the embodiments illustrated below. For the purpose of making the description clearer, the drawings may schematically represent the width, thickness, shape, etc. of each part compared to the actual aspect, but this is merely an example and does not limit the content of the present invention. Also, in this specification, when an element described in one drawing and an element described in another drawing are in the same or corresponding relationship, the same reference numeral (or a reference numeral with a, b, etc. appended after the number described as a reference numeral) may be attached, and repeated explanations may be omitted as appropriate. Furthermore, the characters "first" and "second" appended to each element are for convenience in distinguishing each element and do not have any further meaning unless otherwise specified.

[0015] In the following description, the case where the steel pipe column is a square steel pipe column is exemplified, but the present invention is not limited thereto and can be appropriately applied to round steel pipe columns, shaped steel pipe columns, etc.

[0016] [First Embodiment] The joint structure of the steel pipe column according to an embodiment of the present invention will be described with reference to FIGS. 1(A) and 1(B). FIG. 1(A) shows a developed view of the joint portion of the steel pipe column, and FIG. 1(B) shows a perspective view of the joint portion of the square steel pipe column. Note that in FIG. 1(A), fasteners such as bolts and nuts are omitted.

[0017] FIGS. 1(A) and 1(B) show the first steel pipe column 102, the second steel pipe column 112, and the structure of their joint portion. As shown in FIGS. 1(A) and 1(B), the first steel pipe column 102 has four faces, and for convenience, each face is labeled as the first face 11, the second face 12, the third face 13, and the fourth face 14 in a clockwise direction. Similarly, for the second steel pipe column 112, each face is labeled as the first face 21, the second face 22, the third face 23, and the fourth face 24 in a clockwise direction. Also, unless otherwise specified, when the steel pipe column is erected, in the material axis direction, the first steel pipe column 102 is arranged on the lower side and the second steel pipe column 112 is arranged on the upper side.

[0018] In this embodiment, the first steel pipe column 102 and the second steel pipe column 112 have different column diameters (the thickness of the columns). For the first steel pipe column 102 arranged on the lower side, a thinner column diameter of the second steel pipe column 112 arranged on the upper side is used. The joint structure of the steel pipe columns according to this embodiment has a structure in which steel pipe columns with different column diameters (different thicknesses) are joined together.

[0019] As shown in FIG. 1(A), a first diaphragm 104 is provided on the first steel pipe column 102, and a second diaphragm 114 is provided on the second steel pipe column 112. The first diaphragm 104 is attached by welding so as to close one end of the first steel pipe column 102, and the second diaphragm 114 is attached by welding so as to close one end of the second steel pipe column 112. The first diaphragm 104 and the second diaphragm 114 are flat members, and the shape in plan view is arbitrary. For example, the shapes of the first diaphragm 104 and the second diaphragm 114 in plan view are square as shown in FIG. 1(A). Also, although not shown, the first diaphragm 104 and the second diaphragm 114 may be circular in plan view.

[0020] Since the first steel pipe column 102 and the second steel pipe column 112 have different column diameters (thicknesses), the areas of the first diaphragm 104 and the second diaphragm 114 in plan view may be different accordingly. That is, the diaphragm only needs to have a size capable of closing the end face of the steel pipe column, and the area of the second diaphragm 114 in plan view may be smaller than that of the first diaphragm 104. On the other hand, the first diaphragm 104 arranged on the lower side preferably has a thicker plate thickness than the second diaphragm 114 in order to increase rigidity and load-bearing capacity.

[0021] On the upper surface of the first diaphragm 104, first flanges 106a, 106b and second flanges 108a, 108b are provided. The first flanges 106a, 106b and the second flanges 108a, 108b are plate-like members, and a plurality of bolt holes 122 are provided on the flange surfaces. The first flanges 106a, 106b and the second flanges 108a, 108b are arranged such that their respective flange surfaces are parallel to the material axis direction of the first steel pipe column 102. The first flanges 106a, 106b and the second flanges 108a, 108b are erected on the surface of the first diaphragm 104 and joined by welding.

[0022] The first flange 106a is arranged on the first surface 11 side, and the first flange 106b is arranged on the third surface 13 side. The first flange 106a and the first flange 106b are spaced apart on the first diaphragm 104 such that their inner flange surfaces face each other. Similarly, the second flange 108a is arranged on the second surface 12 side, the second flange 108b is arranged on the fourth surface 14 side, and they are spaced apart on the first diaphragm 104 such that their inner flange surfaces face each other. Thus, the first flanges 106a, 106b and the second flanges 108a, 108b are arranged corresponding to the four surfaces of the first steel pipe column 102.

[0023] As shown in FIG. 1(A), adjacent flanges are arranged spaced apart so as not to contact each other. In other words, the first flange 106a and the second flange 108a are arranged with adjacent sides spaced apart, and the spaced region is provided at a position corresponding to the corner of the first steel pipe column 102. Since adjacent flanges have such a positional relationship, on the first diaphragm 104, regions are provided that are spaced apart corresponding to each corner of the first steel pipe column 102.

[0024] Although not shown in detail in this embodiment, the number of flanges provided on the first diaphragm 104 can be appropriately selected. For example, three flanges may be arranged to form three sides, or six flanges may be arranged to form six sides. In any case, adjacent flanges are arranged so as not to contact each other, so that a portion not shielded by the flanges is not formed.

[0025] The third flanges 116a, 116b and the fourth flanges 118a, 118b are provided on the second diaphragm 114. The third flanges 116a, 116b and the fourth flanges 118a, 118b are plate-like members, and a plurality of bolt holes 122 are provided in the flange surfaces. The third flanges 116a, 116b and the fourth flanges 118a, 118b are arranged such that their respective flange surfaces are parallel to the material axis direction of the second steel pipe column 112. The third flanges 116a, 116b and the fourth flanges 118a, 118b are erected on the surface of the second diaphragm 114 and joined by welding.

[0026] As shown in Fig. 1(A), the first flange 106a and the third flange 116a are arranged such that their respective flange surfaces are directed in the same direction (the first direction). Also, the second flange 108a and the fourth flange 118a are arranged such that their respective flange surfaces are directed in the same direction (the second direction). The second direction is a direction intersecting the first direction. For example, the second direction is a direction rotated 90 degrees with respect to the first direction.

[0027] The first flange 106a and the third flange 116a, and the second flange 108a and the fourth flange 118a are arranged such that their flange surfaces are flush. The first flange 106b, the third flange 116b, the second flange 108b, and the fourth flange 118b are arranged in the same manner. With such an arrangement, when the outer flange surfaces of the third flanges 116a, 116b and the fourth flanges 118a, 118b are arranged to substantially coincide with the outer surface of the second steel pipe column 112, the first flanges 106a, 106b and the second flanges 108a, 108b will be arranged inside the outer surface of the first steel pipe column 102. That is, since the first steel pipe column 102 is thicker than the second steel pipe column 112, when the flange surfaces of the upper and lower flanges are arranged flush, the first flanges 106a, 106b and the second flanges 108a, 108b will be arranged more inwardly within the plane of the first diaphragm 104.

[0028] In this way, by providing a diaphragm at the end of the steel pipe column, even when joining steel pipe columns of different thicknesses, freedom in flange arrangement can be given. In addition, the material and thickness of the flange can be changed with respect to the steel pipe column. For example, the plate thickness of the flange can be increased relative to the thickness of the steel pipe column, and the strength of the bolt joint can be enhanced. Also, when the steel pipe column is formed of steel, as the material of the flange, a material with increased contents of chromium (Cr), molybdenum (Mo), and nickel (Ni) can be used, and both high tensile strength and high ductility can be enhanced at the bolt joint. Furthermore, by providing a diaphragm and joining a flange thereto, buckling of the flange can be suppressed. Also, stress is dispersed among a plurality of flanges, making it possible to prevent stress from concentrating on a specific flange.

[0029] Figure 1(B) shows a state in which the second steel pipe column 112 is disposed and joined on the first steel pipe column 102 such that the first diaphragm 104 and the second diaphragm 114 face each other. The first flange 106a and the third flange 116a have the first packing plate 130a abutting against the outer flange surface and the third packing plate 140a abutting against the inner flange surface, and are fastened by bolts and nuts inserted through the respective bolt holes 122 to form the first bolt joint 100a. Similarly, for the second flange 108a and the fourth flange 118a, the second packing plate 132a abuts against the outer flange surface and the fourth packing plate 142a abuts against the inner flange surface to form the second bolt joint 100b. Since the adjacent flanges are spaced apart from each other, a first opening 120a is formed when the first steel pipe column 102 and the second steel pipe column 112 are joined as shown in Figure 1(B). The first opening 120a is formed corresponding to the corners of the first steel pipe column 102 and the second steel pipe column 112. In other words, the first opening 120a is formed between the first bolt joint 100a and the second bolt joint 100b.

[0030] In Figure 1(B), the structures when the portions indicated by the arrows A1 and A2 are viewed in cross section are shown in Figures 2(A) and 2(B). Figure 2(A) shows the cross-sectional structure of the joint on the side of the first steel pipe column 102, and Figure 2(B) shows the cross-sectional structure of the joint on the side of the second steel pipe column 112.

[0031] As shown in Figure 2(A), the first diaphragm 104 is provided with a first flange 106a corresponding to the first surface 11 of the first steel pipe column 102, a second flange 108a corresponding to the second surface 12, a first flange 106b corresponding to the third surface 13, and a second flange 108b corresponding to the fourth surface 14. Also, as shown in Figure 2(B), the second diaphragm 114 is provided with a third flange 116a corresponding to the first surface 21 of the second steel pipe column 112, a fourth flange 118a corresponding to the second surface 22, a third flange 116b corresponding to the third surface 23, and a fourth flange 118b corresponding to the fourth surface 24.

[0032] In this embodiment, since the column diameter of the second steel pipe column 112 is smaller than that of the first steel pipe column 102, the arrangement of the first flanges 106a, 106b and the second flanges 108a, 108b is restricted by the arrangement of the third flanges 116a, 116b and the fourth flanges 118a, 118b. That is, while the third flanges 116a, 116b and the fourth flanges 118a, 118b are arranged along the side ends of the second diaphragm 114, the first flanges 106a, 106b and the second flanges 108a, 108b are arranged in the inner region from the ends of the first diaphragm 104.

[0033] The first bolt joint 100a is a part where the first flange 106a and the third flange 116a arranged vertically are bolted through the first backing plate 130a and the third backing plate 140a. The second bolt joint 100b is a part where the second flange 108a and the fourth flange 118a arranged vertically are bolted through the second backing plate 132a and the fourth backing plate 142a. The third bolt joint 100c is a part where the first flange 106b and the third flange 116b arranged vertically are bolted through the first backing plate 130b and the third backing plate 140b. The fourth bolt joint 100d is a part where the second flange 108b and the fourth flange 118b arranged vertically are bolted through the second backing plate 132b and the fourth backing plate 142b.

[0034] As shown in FIGS. 2(A) and 2(B), the joint structure of the steel pipe columns according to this embodiment has a first opening 120a between the first bolt joint 100a and the second bolt joint 100b, a second opening 120b between the second bolt joint 100b and the third bolt joint 100c, a third opening 120c between the third bolt joint 100c and the fourth bolt joint 100d, and a fourth opening 120d between the fourth bolt joint 100d and the first bolt joint 100a. These openings are formed by the flanges being arranged separately and are provided corresponding to the respective corners of the steel pipe column.

[0035] As shown in Fig. 1(B), Fig. 2(A) and Fig. 2(B), when the first steel pipe column 102 and the second steel pipe column 112 are vertically arranged and joined in the material axis direction, the first opening 120a, the second opening 120b, the third opening 120c, and the fourth opening 120d are formed. These openings are the parts connecting the space outside the square steel pipe column and the inner space surrounded by the flange. With such a configuration, an operator can use the part that becomes the opening as a handhole at the work site where the first steel pipe column 102 and the second steel pipe column 112 are joined, can apply tools and the like from the inside of the flange, and can easily perform the work of bolt joining.

[0036] The widths of the first flanges 106a, 106b, the second flanges 108a, 108b, the third flanges 116a, 116b, and the fourth flanges 118a, 118b can be appropriately set within the range where the formed openings can be used as handholes. Further, these flanges can be made thicker than the wall thickness of the steel pipe column, thereby increasing the strength of the bolt joint part. In other words, by increasing the plate thickness of the flange, it is possible to prevent a decrease in the strength of the bolt joint part while forming the opening.

[0037] Note that Fig. 2 shows an embodiment in which the first steel pipe column 102 and the second steel pipe column 112 are arranged such that the central axes of the respective steel pipe columns coincide, but the present invention is not limited to such an arrangement of the steel pipe columns. For example, as shown in the schematic plan view of Fig. 3(A), it is also possible to arrange the positions of one corner of the first steel pipe column 102 and one corner of the second steel pipe column 112 to coincide. Further, as shown in the schematic plan view of Fig. 3(B), it is also possible to arrange one side of the first steel pipe column 102 and one side of the second steel pipe column 112 to coincide. Thus, according to an embodiment of the present invention, by connecting two steel pipe columns having different thicknesses by bolt joining, the thickness of the column can be changed on the column base side and the column head side, and the column core can be provided with a shift.

[0038] The first steel pipe column 102 and the second steel pipe column 112 are formed of a steel material. The first diaphragm 104, the second diaphragm 114, the first flanges 106a, 106b, the second flanges 108a, 108b, the third flanges 116a, 116b, the fourth flanges 118a, 118b, the first gusset plates 130a, 130b, the second gusset plates 132a, 132b, the third gusset plates 140a, 140b, and the fourth gusset plates 142a, 142b are also formed of a steel material. For example, structural rolled steel is used as the steel material. Note that FIG. 1(A) shows the first gusset plates 130a, 130b and the second gusset plates 132a, 132b arranged on the outside, and the third gusset plates 140a, 140b and the fourth gusset plates 142a, 142b arranged on the inside. However, when the strength of the bolt joint can be sufficiently maintained, the gusset plates that are abutted against the inside or the outside can be omitted.

[0039] According to the present embodiment, when joining the first steel pipe column 102 and the second steel pipe column 112 by bolt connection, by arranging the flanges so as to form an opening that can be used as a hand hole, the work at the construction site can be easily performed, and a high-quality bolt joint can be formed.

[0040] FIG. 4 shows an outline of the column-beam structure of the first floor portion of a building. A column 202 is erected on a foundation beam 200. The column base side of the column 202 is fixed to the foundation beam 200 with anchor bolts or the like, and a beam 204 is provided on the column head side. FIG. 4 shows a case where the column 202 has a structure in which the first steel pipe column 102 and the second steel pipe column 112 shown in the present embodiment are joined at a bolt joint 100.

[0041] Generally, the stresses acting on a column are significantly different between the column base side and the column head side. For example, in the columns of the first floor portion, since the column base side is joined to a foundation beam with high rigidity, the degree of end fixity is high, and when the column deforms due to an earthquake or the like, the stress on the column base side is greater than that on the column head side. That is, for the columns installed in the first floor portion, since the column base side is fixed to a foundation with high stiffness, the degree of fixity of the column base side is higher than that of the column head side, and the bending moment is accordingly higher.

[0042] The conventional column-beam structure forms the column up to the column head with the same thickness as required at the column base, and has a structure that switches the upper column from the beam on the upper floor to a thinner column. In particular, in high-rise buildings, an embedded footing column method may be adopted. In this case, for construction convenience (such as fine adjustment of the column position), the column is transported to the construction site divided into a lower part (zero joint) below the middle of the first floor and an upper part (one joint) above it, and the upper and lower columns are joined by welding at the construction site for assembly (on-site joining). Since welding requires the positions of the upper and lower columns (steel pipes) to be the same, it is necessary to make the positions of the columns (steel pipes) arranged vertically the same. Since the thickness of the steel pipe used as the column is determined based on the footing column side, the design on the column head side becomes excessive.

[0043] On the other hand, according to the joint structure of the steel pipe column according to this embodiment, as shown in FIG. 4, it is possible to change the thickness of the column in the middle of the first floor part. That is, by providing a bolt joint part 100 in the middle of the first floor part and connecting the first steel pipe column 102 and the second steel pipe column 112, the column diameter on the column base side (the first steel pipe column 102) can be made thicker, and the column diameter on the column head side (the second steel pipe column 112) can be made thinner, and a structure suitable for the column head part with a small bending moment can be created. In addition, by providing the joint part 100 below the center of the column, workability is improved. Further, by providing the joint part 100 above the center of the column, it is possible to make the thickness of the second steel pipe column 112 smaller, and cost reduction and reduction of the occupied area are possible.

[0044] In this embodiment, a mode in which four openings that can be used as hand holes are provided is shown, but the present invention is not limited to such a mode, and when it does not affect workability (when an opening with a sufficient diameter can be obtained), the number of openings can be provided less than four. Such a change in the number of openings can be appropriately performed according to the arrangement of the flanges joined to the diaphragm.

[0045] [Second Embodiment] This embodiment shows a structure in which a reinforcing plate (which can also be said to be a "web") is further provided in the joint structure of the steel pipe column shown in the first embodiment. In the following description, the focus will be on the parts that are different from the first embodiment.

[0046] FIG. 5(A) shows a developed view of the joint portion of the square steel pipe column according to this embodiment, and FIG. 5(B) shows a perspective view of the joint portion of the square steel pipe column. As shown in FIG. 5(A), a first reinforcing plate 160 is provided on the side of the first steel pipe column 102, and a second reinforcing plate 162 is provided on the side of the second steel pipe column 112. The first reinforcing plate 160 is disposed in the inner region surrounded by the first flanges 106a, 106b and the second flanges 108a, 108b, and the second reinforcing plate 162 is disposed in the inner region surrounded by the third flanges 116a, 116b and the fourth flanges 118a, 118b.

[0047] The first reinforcing plate 160 is disposed perpendicular to the first diaphragm 104 and is provided in contact with the inner flange surfaces of the first flanges 106a, 106b, the second flanges 108a, 108b. The second reinforcing plate 162 is disposed perpendicular to the second diaphragm 114 and is provided in contact with the inner flange surfaces of the third flanges 116a, 116b and the fourth flanges 118a, 118b. The first reinforcing plate 160 and the second reinforcing plate 162 may have different thicknesses. That is, the first reinforcing plate 160 disposed below may be thicker than the second reinforcing plate 162 disposed above.

[0048] In order to form a bolt joint, first packing plates 130a, 130b, second packing plates 132a, 132b are disposed outside the flanges, and third packing plates 140a, 140b, fourth packing plates 142a, 142b are disposed inside. Similar to the first embodiment, one of the inner or outer sides of the packing plates can be omitted. The first reinforcing plate 160 and the second reinforcing plate 162 are abutted against the respective flanges at positions that do not overlap the bolt holes. The third packing plates 140a, 140b and the fourth packing plates 142a, 142b have a structure divided into two on the left and right so as not to interfere with the first reinforcing plate 160 and the second reinforcing plate 162.

[0049] As shown in FIG. 5(B), in a state where the first steel pipe column 102 and the second steel pipe column 112 are joined, a first opening 120a is formed, and the first reinforcing plate 160 and the second reinforcing plate 162 have a structure hidden inside the bolt joint and not exposed to the outside.

[0050] In FIG. 5(B), the structures when the portions indicated by the arrows A3 and A4 are viewed in cross section are shown in FIGS. 6(A) and 6(B). FIG. 6(A) shows the cross-sectional structure of the joint on the side of the first steel pipe column 102, and FIG. 6(B) shows the cross-sectional structure of the joint on the side of the second steel pipe column 112.

[0051] Similar to the first embodiment, bolt joints 100 (the first bolt joint 100a, the second bolt joint 100b, the third bolt joint 100c, the fourth bolt joint 100d) are formed on each surface of the steel pipe column. The first reinforcing plate 160 abuts against substantially the central portions of the inner flange surfaces of the first flanges 106a, 106b, the second flanges 108a, 108b, and the second reinforcing plate 162 is provided so as to abut against substantially the central portions of the third flanges 116a, 116c, the fourth flanges 118a, 118b. Since the first reinforcing plate 160 and the second reinforcing plate 162 have a cross-shaped shape in plan view, they can be arranged so as not to block the first opening 120a, the second opening 120b, the third opening 120c, and the fourth opening 120d. Therefore, even if the first reinforcing plate 160 and the second reinforcing plate 162 are provided, these openings can be used as hand holes to perform bolt joint work at the construction site.

[0052] In this embodiment, a cross-shaped reinforcing plate is shown in plan view, but the present invention is not limited to this, and an I-shaped reinforcing plate may be used. That is, a reinforcing plate that abuts only against two opposing flanges may be provided.

[0053] In this way, by providing the first reinforcing plate 160 and the second reinforcing plate 162, the mechanical strength of the bolt joint 100 can be increased. For example, the resistance to the shearing force acting on the bolt joint 100 can be enhanced. The joint structure of the steel pipe column according to the present embodiment is the same as the structure according to the first embodiment except that the first reinforcing plate 160 and the second reinforcing plate 162 are provided, and the same operational effects can be achieved.

[0054] In the joint structure of the steel pipe column shown in FIGS. 5(A) and 5(B), the reinforcing plates arranged vertically may be bolted together. FIG. 7(A) shows a developed view of the joint portion of the square steel pipe column according to the present embodiment, and FIG. 7(B) shows a perspective view of the joint portion of the square steel pipe column. As shown in FIG. 7(A), the fifth packing plate 144a and the sixth packing plate 146a are provided so as to be in contact with the first reinforcing plate 160 and the second reinforcing plate 162. The fifth bolt joint portion 101a and the sixth bolt joint portion 101b shown in FIG. 7(B) are formed at positions visible from the first opening 120a.

[0055] In FIG. 7(B), the structures when the portions indicated by the arrows A5 and A6 are viewed in cross section are shown in FIGS. 8(A) and 8(B). FIG. 8(A) shows the cross-sectional structure of the joint portion on the side of the first steel pipe column 102, and FIG. 8(B) shows the cross-sectional structure of the joint portion on the side of the second steel pipe column 112. As shown in FIGS. 8(A) and 8(B), bolt joint portions 101 (the fifth bolt joint portion 101a, the sixth bolt joint portion 101b, the seventh bolt joint portion 101c, the eighth bolt joint portion 101d) for joining the first reinforcing plate 160 and the second reinforcing plate 162 are provided. The fifth bolt joint portion 101a has a structure in which the first reinforcing plate 160 and the second reinforcing plate 162 are sandwiched between the fifth packing plate 144a and the sixth packing plate 146a. Similarly, the sixth bolt joint portion 101b is formed using the fifth packing plate 144b and the sixth packing plate 146b, the seventh bolt joint portion 101c is formed using the fifth packing plate 144c and the sixth packing plate 146c, and the eighth bolt joint portion 101d is formed using the fifth packing plate 144d and the sixth packing plate 146d.

[0056] The fifth bolt joint 101a is sandwiched between the first opening 120a and the second opening 120d, and at the construction site, the bolt joining work can be carried out using both of these openings. Other bolt joints for bolt-joining the first reinforcing plate 160 and the second reinforcing plate 162 are similarly arranged sandwiched between two openings, so that the bolt joining work can be easily carried out at the construction site.

[0057] In this way, by bolt-joining the first reinforcing plate 160 and the second reinforcing plate 162, the strength of the joint connecting the first steel pipe column 102 and the second steel pipe column 112 can be increased. The bolt joint 101 between the first reinforcing plate 160 and the second reinforcing plate 162 is formed in the inner region surrounded by the flange, but since it is surrounded by the opening 120, the bolt tightening work can be easily carried out even at the construction site.

[0058] Also in this embodiment, as in the first embodiment, it is possible to change the thickness of the steel pipe column in the middle of the first floor part. That is, by providing a bolt joint 100 in the middle of the first floor part to connect the first steel pipe column 102 and the second steel pipe column 112, the column diameter on the column base side (the first steel pipe column 102) can be made thicker, and the column diameter on the column head side (the second steel pipe column 112) can be made thinner, and a structure suitable for the column head part with a small bending moment can be created.

[0059] [Third Embodiment] A joint structure of a steel pipe column according to an embodiment of the present invention will be described with reference to FIGS. 9(A) and 9(B). FIG. 9(A) shows a developed view of the joint part of the steel pipe column, and FIG. 9(B) shows a perspective view of the joint part of the square steel pipe column. In FIG. 9(A), fasteners such as bolts and nuts are omitted.

[0060] As shown in FIG. 9(A), a first diaphragm 104 is provided at one end of the first steel pipe column 102, and a second diaphragm 114 is provided at one end of the second steel pipe column 112. The first diaphragm 104 and the second diaphragm 114 are joined to the first steel pipe column 102 and the second steel pipe column 112 by welding, respectively.

[0061] Similar to the first embodiment, in this embodiment as well, a steel pipe column 102 with a larger column diameter (thickness) than that of the second steel pipe column 112 is used. Also, a diaphragm 104 with a greater plate thickness than that of the second diaphragm 114 is used.

[0062] The first diaphragm 104 has the first flanges 106a and 106b and the second flanges 108a and 108b joined thereto. The first flanges 106a and 106b have substantially the same shape, with their flange surfaces arranged parallel to the material axis direction of the first steel pipe column 102 and provided to face each other at a predetermined interval. The second flanges 108a and 108b have their flange surfaces arranged in a direction parallel to the material axis direction of the first steel pipe column 102, directed in a direction intersecting the direction in which the first flanges 106a and 106b face each other, and provided to face each other at a predetermined interval. FIG. 9(A) shows a mode in which the first flange 106a is disposed corresponding to the 11th surface of the first steel pipe column 102, the first flange 106b is disposed corresponding to the 13th surface, the second flange 108a is disposed corresponding to the 12th surface, and the second flange 108b is disposed corresponding to the 14th surface. As shown in the drawing, the flanges are provided such that their adjacent ends are in contact. With such an arrangement of the flanges, a region surrounded by the first flanges 106a and 106b and the second flanges 108a and 108b is formed on the first diaphragm 104.

[0063] The first flange 106a is flat and has a first through-hole 124a in addition to a plurality of bolt holes 122. When the first flange 106a is viewed in the longitudinal direction, the first through-hole 124a is disposed on the side closer to the first diaphragm 104. That is, the first through-hole 124a is disposed between one side where the first flange 106a is in contact with the first diaphragm 104 and the region where the plurality of bolt holes 122 are provided. The first flange 106b has the same form as the first flange 106a and has a third through-hole 124c in addition to the plurality of bolt holes. On the other hand, only a plurality of bolt holes 122 are provided in the second flanges 108a and 108b, and they do not have through-holes corresponding to the first through-hole 124a and the third through-hole 124c.

[0064] To the second diaphragm 114, third flanges 116a, 116b and fourth flanges 118a, 118b are joined. The third flanges 116a, 116b have substantially the same shape, and the flange surfaces are arranged in a direction parallel to the material axis direction of the second steel pipe column 112 and are provided so as to face each other at a predetermined interval. The fourth flanges 118a, 118b have flange surfaces arranged in a direction parallel to the material axis direction of the second steel pipe column 112, are directed in a direction intersecting the direction in which the third flanges 116a, 116b face each other, and are provided so as to face each other at a predetermined interval. FIG. 9(A) shows a mode in which the third flange 116a is arranged corresponding to the 22nd surface of the second steel pipe column 112, the third flange 116b is arranged corresponding to the 24th surface, the fourth flange 118a is arranged corresponding to the 21st surface, and the fourth flange 118b is arranged corresponding to the 23rd surface. As shown in the drawing, each flange is provided so that adjacent end portions are in contact. With such an arrangement of the flanges, a region surrounded by the third flanges 116a, the third flanges 116b, the fourth flanges 118a, and the fourth flanges 118b is formed on the second diaphragm 114.

[0065] The third flange 116a is in a flat plate shape and has a second through hole 124b and a plurality of bolt holes 122. When the third flange 116a is viewed in the vertical direction, the second through hole 124b is arranged on the side closer to the second diaphragm 114. That is, the second through hole 124b is arranged between one side where the third flange 116a contacts the second diaphragm 114 and the region where the plurality of bolt holes 122 are provided. The third flange 116b has the same form as the third flange 116a and has a fourth through hole 124d (not shown) in addition to the plurality of bolt holes. On the other hand, only a plurality of bolt holes 122 are provided in the fourth flanges 118a, 118b, and through holes corresponding to the second through hole 124b and the fourth through hole 124d are not provided.

[0066] There is no limitation on the sizes of the first through hole 124a, the second through hole 124b, the third through hole 124c, and a fourth through hole 124d (not shown). Since these through holes are used as hand holes, it is preferable that they have a hole diameter through which an operator can insert a tool or the like to perform bolt joining work. There is no limitation on the shapes of these through holes, and they may be circular as shown in FIG. 9(A), or may be elliptical, rectangular, or any polygon. Further, the plurality of bolt holes 122 provided in each flange have a diameter through which a bolt, which is a fastener, can be inserted, and are arranged as appropriate.

[0067] The first packing plates 130a and 130b are arranged outside the first flanges 106a and 106b and the fourth flanges 118a and 118b, and the second packing plates 132a and 132b are arranged outside the second flanges 108a and 108b and the third flanges 116a and 116b. The third packing plates 140a and 140b are arranged inside the first flanges 106a and 106b and the fourth flanges 118a and 118b, and the fourth packing plates 142a and 142b are arranged inside the second flanges 108a and 108b and the third flanges 116a and 116b. Bolt holes 122 are provided in each packing plate.

[0068] As shown in FIG. 9(A), the first flange 106a and the third flange 116a are arranged such that their respective flange surfaces face the same direction (the first direction). Further, the second flange 108a and the fourth flange 118a are arranged such that their respective flange surfaces face the same direction (the second direction). The second direction is a direction intersecting the first direction. For example, the second direction is a direction rotated 90 degrees with respect to the first direction.

[0069] The flange surface of the first flange 106a and the flange surface of the fourth flange 118a are arranged flush. Similarly, the second flange 108a and the third flange 116a, the first flange 106b and the fourth flange 118b, and the second flange 108b and the third flange 116b are arranged such that their respective flange surfaces are flush.

[0070] The first flanges 106a and 106b and the third flanges 116a and 116b are formed to be longer in the axial direction of the material than the second flanges 108a and 108b and the fourth flanges 118a and 118b. In other words, in the first flange 106a, the region where a plurality of bolt holes 122 are provided due to the provision of the first through hole 124a is arranged at a higher position than the region where a plurality of bolt holes 122 are provided in the second flange 108a. Also, in the third flange 116a, the region where a plurality of bolt holes 122 are provided due to the provision of the second through hole 124b is arranged at a lower position than the region where a plurality of bolt holes 122 are provided in the fourth flange 118a. Such a positional relationship is the same for the positional relationship between the first flange 106b and the second flange 108b, and the positional relationship between the third flange 116b and the fourth flange 118b.

[0071] FIG. 9(B) shows a mode in which the first steel pipe column 102 and the second steel pipe column 112 are arranged in the vertical direction, and the first bolt joint 100a and the second bolt joint 100b are formed (although not shown, a third bolt joint 100c and a fourth bolt joint 100d are formed on the back side). The first bolt joint 100a is formed by sandwiching the first flange 106a and the fourth flange 118a between the first packing plate 130a and the third packing plate 140a and fastening them with bolts and nuts. Similarly, the second bolt joint 100b is formed by sandwiching the second flange 108a and the third flange 116a between the second packing plate 132a and the fourth packing plate 142a and fastening them with bolts and nuts. In this embodiment as well, when the strength of the bolt joint can be sufficiently maintained, the packing plate that abuts on the inner or outer side can be omitted.

[0072] FIG. 10 shows a front view of the joint structure of the steel pipe column according to the present embodiment. In the first bolt joint portion 100a, the first backing plate 130a and the third backing plate 140a (not shown) abut against both the first flange 106a and the fourth flange 118a and have a size that does not block the first through hole 124a. Such a configuration is the same for the second bolt joint portion 100b, the third bolt joint portion 100c (not shown), and the fourth bolt joint portion 100d.

[0073] As described with reference to FIGS. 9(A) and 9(B), the heights of the regions where the bolt holes 122 of the first flange 106a are formed and the regions where the bolt holes 122 of the second flanges 108a and 108b are formed are different. Also, the heights of the regions where the bolt holes 122 of the third flange 116a are formed and the regions where the bolt holes 122 of the fourth flanges 118a and 118b are formed are different. Therefore, the height of the first bolt joint portion 100a is different from the heights of the second bolt joint portion 100b and the fourth bolt joint portion 100d. And the first through hole 124a is located below the first bolt joint portion 100a (not shown, but the third through hole 124c is the same), the second through hole 124b is located above the second bolt joint portion, and the fourth through hole 124d is located above the fourth bolt joint portion 100d.

[0074] In this way, by making the heights of the bolt joint portions and the through holes formed on the adjacent surfaces different and arranging them diagonally, since not all of the through holes arranged on each surface of the steel pipe column are arranged at the same height, the axial force, shear force, and bending stress acting on the steel pipe column can be enhanced.

[0075] As shown in FIG. 10, with respect to the first bolt joint 100a, the first through hole 124a is disposed on the lower side, and the second through hole 124b and the fourth through hole 124d are disposed on the upper side on the adjacent surface. In this way, by arranging a plurality of through holes with different heights with respect to one bolt joint, the work at the construction site becomes easier. That is, the operator can easily perform the bolt joining work by inserting tools and the like through a plurality of through holes with different heights and directions.

[0076] FIG. 11(A) shows the structure when the portion indicated by arrow A5 in FIG. 10 is viewed in cross section, and FIG. 11(B) shows the structure when the portion indicated by arrow A6 in FIG. 10 is viewed in cross section.

[0077] As shown in FIG. 11(A), on the first diaphragm 104, the first flange 106a and the first flange 106b are arranged to face each other, and the second flange 108a and the second flange 108b are arranged to face each other. With such an arrangement of the flanges, the first through hole 124a is disposed on the first surface 11 side of the first steel pipe column 102, and the third through hole 124c is disposed on the third surface 13 side. Further, the second bolt joint 100b is formed on the second surface 12 side of the first steel pipe column 102, and the fourth bolt joint 100d is formed on the fourth surface 14 side. As shown in FIG. 11(B), on the second diaphragm 114, the third flange 116a and the third flange 116b are arranged to face each other, and the fourth flange 118a and the fourth flange 118b are arranged to face each other. With such an arrangement of the flanges, the second through hole 124b is disposed on the second surface 22 side of the second steel pipe column 112, and the fourth through hole 124d is disposed on the fourth surface 24 side. Further, the first bolt joint 100a is formed on the first surface 21 side of the second steel pipe column 112, and the third bolt joint 100c is formed on the third surface 23.

[0078] As shown in Fig. 11(A), the second bolt joint 100b is formed by sandwiching the second flange 108a between the first backing plate 130b and the third backing plate 140b, inserting a bolt 150 through the bolt hole 122, and fastening it with a nut 152. The cross-sectional area of the portion of the second flange 108a where the bolt hole 122 is formed is smaller than that of the other portions. However, by providing the first backing plate 130b and the third backing plate 140b, the decrease in the cross-sectional area can be compensated, and the decrease in the shear strength can be suppressed. The plate thicknesses of the first backing plate 130a and the third backing plate 140a can be set as appropriate. Such a configuration is the same for the first bolt joint 100a, the third bolt joint 100c, and the fourth bolt joint 100d.

[0079] As is apparent from referring to Figs. 11(A) and 11(B), through-holes are arranged in four directions so as to be sandwiched by bolt joints at the joint portion between the first steel pipe column 102 and the second steel pipe column 112. In such a joint structure, by making the material axis direction lengths of the flanges without through-holes different from those of the flanges with through-holes with respect to the flanges provided with through-holes, and bolt-joining these two types of flanges, as shown in Figs. 9(B) and 10, the positions of the through-holes and the positions of the bolt joints can be arranged obliquely. By having the flanges provided at the joint portion have such a configuration, the workability of bolt joining for connecting the first steel pipe column 102 and the second steel pipe column 112 can be improved.

[0080] According to the present embodiment, the first through-hole 124a, the second through-hole 124b, the third through-hole 124c, and the fourth through-hole 124d are used as hand holes, and bolts are set from the inside of the joint portion where the flanges are arranged, and by performing bolt tightening, two steel pipe columns can be joined at the construction site. Bolt joining is easier technically than welding joining, and the quality can be stabilized by following the procedure. Then, by arranging a plurality of through-holes that can be used as hand holes obliquely (with different hole-opening directions), the amount of welding at the construction site can be minimized as much as possible, the workability of bolt joining can be improved, and a joint structure can be obtained in which the strength of the joint portion is equal to or greater than that of the other portions.

[0081] Also in this embodiment, similar to the first embodiment, it is possible to change the thickness of the steel pipe column in the middle of the first floor part. That is, by providing a bolt joint 100 in the middle of the first floor part and connecting the first steel pipe column 102 and the second steel pipe column 112, the column diameter on the column base side (the first steel pipe column 102) can be made thicker, and the column diameter on the column head side (the second steel pipe column 112) can be made thinner, and a structure suitable for the column head part with a small bending moment can be created.

[0082] [Fourth Embodiment] This embodiment shows a mode in which the arrangement of the flanges provided with through holes is different from the joint structure of the steel pipe column shown in the fourth embodiment. In the following, the description will be centered on the parts different from the fourth embodiment.

[0083] FIG. 12(A) shows a development view of the joint part of the steel pipe column according to this embodiment, and FIG. 12(B) shows a perspective view of the joint part of the steel pipe column. In FIG. 12(A), fasteners such as bolts and nuts are omitted.

[0084] As shown in FIG. 12(A), on the first diaphragm 104, a first flange 106a having a first through hole 124a corresponding to the first surface 11 is provided, and a first flange 106b having a second through hole 124b corresponding to the second surface 12 is provided. Also, a second flange 108a (not shown) is provided corresponding to the third surface 13, and a second flange 108b is provided corresponding to the fourth surface 14. On the second diaphragm 114, a fourth flange 118a is provided corresponding to the first surface 21, and a fourth flange 118b is provided corresponding to the second surface 22. Also, a third flange 116a having a third through hole 124c (not shown) is provided corresponding to the third surface 23, and a third flange 116b having a fourth through hole 124d (not shown) is provided corresponding to the fourth surface 24.

[0085] That is, in the present embodiment, on both the first diaphragm 104 side and the second diaphragm 114 side, there is a structure in which flanges having through holes are arranged adjacent to each other. In other words, the joint structure of the steel pipe column according to the present embodiment has a configuration in which the first flanges 106a and 106b and the third flanges 116a and 116b are arranged so as to form L-shapes respectively.

[0086] As shown in FIG. 12(B), when joining the first steel pipe column 102 and the second steel pipe column 112, these two L-shaped structures are arranged so as to engage with each other. As a result, the first bolt joint portion 100a and the second bolt joint portion 100b are formed at the same height, and the first through hole 124a and the second through hole 124b are arranged at the same height.

[0087] FIG. 13 shows a front view of the joint structure of the steel pipe column according to the present embodiment. The first bolt joint portion 100a is formed on the sides of the first surface 11 and the first surface 21 of the steel pipe column, the second bolt joint portion 100b is formed on the sides of the second surface 12 and the second surface 22, and the fourth bolt joint portion 100d is formed on the sides of the fourth surface 14 and the fourth surface 24 (although not shown, the third bolt joint portion 100c is formed on the sides of the third surface 13 and the third surface 23).

[0088] As shown in FIG. 13, the first through hole 124a and the second through hole 124b are arranged at the same height on two adjacent surfaces. In other words, the first through hole 124a is arranged below the first bolt joint portion 100a, and the second through hole 124b is arranged below the second bolt joint portion 100b. Also, the fourth through hole 124d is arranged at the same height as the third through hole 124c (not shown). And the fourth through hole 124d is arranged above the fourth bolt joint portion 100d.

[0089] FIG. 14(A) shows the structure when the part indicated by arrow A7 in FIG. 13 is viewed in cross section, and FIG. 14(B) shows the structure when the part indicated by arrow A8 in FIG. 13 is viewed in cross section.

[0090] As shown in FIG. 14(A), a first flange 106a and a first flange 106b are arranged in an L shape on the first diaphragm 104, and a second flange 108a and a second flange 108b are arranged in an L shape. Due to such an arrangement of the flanges, a first through hole 124a is arranged on the first surface 11 side of the first steel pipe column 102, and a second through hole 124b is arranged at the same height on the second surface 12 side. Further, a third bolt joint 100c is formed on the third surface 13 side of the first steel pipe column 102, and a fourth bolt joint 100d is formed at the same height on the fourth surface 14 side. Also, as shown in FIG. 14(B), a third flange 116a and a third flange 116b are arranged in an L shape on the second diaphragm 114, and a fourth flange 118a and a fourth flange 118b are arranged in an L shape. Due to such an arrangement of the flanges, a third through hole 124c is arranged on the third surface 23 side of the second steel pipe column 112, and a fourth through hole 124d is arranged at the same height on the fourth surface 24 side. Further, a first bolt joint 100a is formed on the first surface 21 side of the second steel pipe column 112, and a second bolt joint 100b is formed at the same height on the second surface 22.

[0091] The joint structure of the steel pipe column according to this embodiment provides through holes of the same height on two adjacent surfaces, provides through holes of the same height on the other two adjacent surfaces facing the two adjacent surfaces, and has a structure in which the heights of the through holes are different between the two adjacent surfaces and the other two adjacent surfaces. According to such an arrangement of the through holes, for example, the workability when constructing bolt joints using both hands can be improved. And by arranging such a set of through holes obliquely with different heights, the workability when forming bolt joints on each surface can be improved, the amount of welding at the construction site can be minimized as much as possible, the workability of bolt joints can be improved, and a joint structure can be obtained in which the strength of the joint part is equal to or greater than that of other parts. Also, since not all of the through holes arranged on each surface of the steel pipe column are arranged at the same height, a decrease in the strength of the joint part can be suppressed.

[0092] Note that the arrangement of the flange provided with the through hole may be different from that shown in Fig. 12(A). Fig. 15(A) shows a developed view of the joint part of the steel pipe column according to another form of the present embodiment, and Fig. 15(B) shows a perspective view of the joint part of the steel pipe column. Further, Fig. 16(A) shows the structure when the part indicated by the arrow A9 shown in Fig. 15(B) is viewed in cross section, and Fig. 16(B) shows the structure when the part indicated by the arrow A10 is viewed in cross section.

[0093] As shown in Fig. 15(A), on the side of the first steel pipe column 102, a first flange 106a is provided corresponding to the first surface 11, and second flanges 108a, 108b, 108c are provided so as to form a U-shape corresponding to the twelfth surface, the thirteenth surface, and the fourteenth surface. A first through hole 124a is provided in the first flange 106a. Only bolt holes 122 are provided in the second flanges 108a, 108b, 108c, and no through hole for forming a hand hole is provided. On the side of the second steel pipe column 112, a fourth flange 118a is provided corresponding to the twenty-first surface, and third flanges 116a, 116b, 116c are provided so as to form a U-shape corresponding to the twenty-second surface, the twenty-third surface, and the twenty-fourth surface. A second through hole 124b is provided in the third flange 116a. Although not shown in Fig. 15(A), a third through hole 124c is provided in the third flange 116b, and a fourth through hole 124d is provided in the third flange 116c. Only bolt holes 122 are provided in the fourth flange 118a, and no through hole for forming a hand hole is provided.

[0094] FIG. 15(B) shows a structure in which the first steel pipe column 102 and the second steel pipe column 112 having such an arrangement are bolted together. As shown in FIG. 15(B), the first through-hole 124a is arranged on the side closer to the first steel pipe column 102, while the second through-hole 124b (and the third through-hole 124c, the fourth through-hole 124d) is arranged on the side closer to the second steel pipe column 112. Thus, in the structure of the joint portion of the steel pipe column according to another form of the present embodiment, the second through-hole 124b (and the third through-hole 124c, the fourth through-hole 124d) is arranged at a different height with respect to the first through-hole 124a. In other words, the second through-hole 124b (and the third through-hole 124c, the fourth through-hole 124d) is arranged obliquely with respect to the first through-hole 124a.

[0095] As shown in FIG. 16(A), a first through-hole 124a is disposed on the side of the first surface 11, a second bolt joint portion 100b is disposed on the side of the second surface 12, a third bolt joint portion 100c is disposed on the side of the third surface 13, and a fourth bolt joint portion 100d is disposed on the side of the fourth surface 14. On the other hand, as shown in FIG. 16(B), a second through-hole 124b is disposed on the side of the second surface 22, a third through-hole 124c is disposed on the side of the third surface 23, a fourth through-hole 124d is disposed on the side of the fourth surface 24, and a first bolt joint portion 100a is disposed on the side of the first surface 21. In this way, by changing the arrangement of the flanges, the through-holes provided on three surfaces can be made to have the same height, and the height of the through-holes provided on the other one surface can be made different. And by arranging three through-holes in height, even when multiple people are involved in construction, they can work simultaneously without interfering with each other. In this case, by making the height of at least one through-hole different, tools and the like can be inserted from different angles, and the workability of bolt joining can be improved. With respect to the first through-hole 124a, the second through-hole 124b, the third through-hole 124c, and the fourth through-hole 124d are each arranged obliquely, so that the workability when forming bolt joints on each surface can be improved, the amount of welding at the construction site can be minimized as much as possible, the workability of bolt joining can be improved, and a joint structure having a strength equal to or greater than that of other parts at the joint portion can be obtained. Also, since not all of the through-holes arranged on each surface of the steel pipe column are arranged at the same height, a decrease in the strength of the joint portion can be suppressed.

[0096] Furthermore, also in this embodiment, similar to the first embodiment, it is possible to change the thickness of the steel pipe column in the middle of the first floor portion. That is, by providing a bolt joint portion 100 in the middle of the first floor portion to connect the first steel pipe column 102 and the second steel pipe column 112, the column diameter of the column base side (the first steel pipe column 102) can be made thicker, and the column diameter of the column head side (the second steel pipe column 112) can be made thinner, and a structure suitable for the column head portion with a small bending moment can be created.

[0097] [Fifth Embodiment] In the joint structure of the steel pipe column shown in the fourth embodiment, a reinforcing plate may be provided in the same manner as in the second embodiment. This embodiment shows the joint structure of the steel pipe column when a reinforcing plate is provided on the flange having the through hole.

[0098] FIG. 17(A) shows a developed view of the joint portion in the joint structure of the steel pipe column according to this embodiment, and FIG. 17(B) shows a perspective view of the joint structure of the steel pipe column according to this embodiment. In FIG. 17(A), fastening members such as bolts and nuts are omitted.

[0099] As shown in FIGS. 17(A) and 17(B), the first reinforcing plate 160 is provided in the region surrounded by the first flanges 106a, 106b, the second flanges 108a, 108b. The first reinforcing plate 160 is erected in a direction parallel to the material axis direction of the first steel pipe column 102, and is provided so as to be in contact with at least the inner flange surfaces of the first flanges 106a, 106b. Further, the first reinforcing plate 160 may have a cross shape in plan view so as to be in contact with the inner flange surfaces of the second flanges 108a, 108b. On the side of the second steel pipe column 112, a second reinforcing plate 162 having a similar structure is provided.

[0100] FIG. 18 shows a front view of the joint structure of the steel pipe column according to this embodiment. The first reinforcing plate 160 is provided on the side of the first steel pipe column 102 at the same height as the portion where the first through hole 124a (and the third through hole 124c not shown) is provided. Also, the second reinforcing plate 162 is provided on the side of the second steel pipe column 112 at the same height as the portion where the second through hole 124b and the fourth through hole 124d are provided.

[0101] The first reinforcing plate 160 is arranged such that one end thereof abuts against the position where the first through hole 124a of the first flange 106a is provided (the same applies to the first flange 106b not shown). Further, when the first reinforcing plate 160 has a cross shape, it is provided so as to abut against both the second flanges 108a and 108b. One end of the second reinforcing plate 162 abuts at the position where the second through hole 124b of the third flange 116a is provided, and the other end abuts at the position where the fourth through hole 124d of the third flange 116b is provided. Further, when the second reinforcing plate 162 has a cross shape, it is provided so as to abut against both the fourth flanges 118a and 118b. The first reinforcing plate 160 and the second reinforcing plate 162 are fixed to the respective abutting flanges by welding.

[0102] In this way, by providing the first reinforcing plate 160 at the position where the through holes of the first flanges 106a and 106b are provided, the strength of that part can be increased. That is, in the first flanges 106a and 106b, the strength of the part where the first through hole 124a and the third through hole 124c are provided can be supplemented. Similarly, by providing the second reinforcing plate 162 at the position where the through holes of the third flanges 116a and 116b are provided, the strength of that part can be increased.

[0103] The first reinforcing plate 160 may be provided with a first notch 164a at a position overlapping the first through hole 124a (and the third through hole 124c not shown), and the second reinforcing plate 162 may be provided with a second notch 164b at a position overlapping the second through hole 124b and the fourth through hole 124d. The shapes of the first notch 164a and the second notch 164b are arbitrary, but for example, they may have a semi-circular shape having substantially the same diameter as the respective through holes. By providing the first notch 164a and the second notch 164b in the first reinforcing plate 160 and the second reinforcing plate 162, it is possible to prevent the reinforcing plate from blocking a part of the through hole. Thereby, even when inserting a tool or the like through each through hole for work, the reinforcing plate does not interfere and the workability can be prevented from deteriorating.

[0104] FIG. 19(A) shows the structure when the part indicated by arrow A11 in FIG. 18 is viewed in cross section, and FIG. 19(B) shows the structure when the part indicated by arrow A12 in FIG. 18 is viewed in cross section.

[0105] As shown in FIG. 19(A), the first reinforcing plate 160 is provided so as to be in contact with the flange surfaces inside the first flanges 106a and 106b. Further, as shown in the drawing, when the first reinforcing plate 160 has a cross-shaped shape in plan view, it is provided so as to be in contact with the flange surfaces inside the second flanges 108a and 108b. The first reinforcing plate 160 is provided at a position overlapping with the first through hole 124a and the third through hole 124c. At the end of the first reinforcing plate 160, a first notch 164a is provided so as not to block a part of these through holes. The second reinforcing plate 162 shown in FIG. 19(B) also has the same configuration, and a second notch 164b is provided at the end overlapping with the second through hole 124b and the fourth through hole 124d.

[0106] As shown in FIGS. 19(A) and 19(B), by providing a reinforcing plate at the part where the flange is provided, the strength of that part can be increased. In particular, when a through hole is provided in the flange, by providing a reinforcing plate, it is possible to compensate for the decrease in strength (rigidity) due to the provision of the through hole.

[0107] Furthermore, the first reinforcing plate 160 and the second reinforcing plate 162 may be joined by bolt joining. For example, as shown in FIG. 20, fifth and sixth packing plates 144 and 146 connected to the first reinforcing plate 160 and the second reinforcing plate 162 are provided, and bolt joining can be formed in the same manner as the example shown in the second embodiment. The fifth packing plate 144 and the sixth packing plate 146 preferably have a width that does not overlap with the first notch 164a formed in the first reinforcing plate 160 and the second notch 164b formed in the second reinforcing plate 162.

[0108] The other configurations of the steel pipe column according to this embodiment are the same as those according to the fourth embodiment, and the same operational effects can be achieved. That is, also in this embodiment, similar to the first embodiment, it is possible to change the thickness of the steel pipe column in the middle of the first floor part, thicken the column diameter on the column base side (the first steel pipe column 102), and thin the column diameter on the column head side (the second steel pipe column 112), and a structure suitable for the column head part with a small bending moment can be created.

[0109] [Sixth Embodiment] This embodiment shows an aspect in which the configuration of the flange is different in the joint structure of the steel pipe column shown in the third embodiment. In the following, the description will focus on the parts different from the third embodiment.

[0110] FIG. 21(A) shows a developed view of the joint part of the steel pipe column according to this embodiment, and FIG. 21(B) shows a perspective view of the joint part of the steel pipe column. Also, FIG. 22(A) shows the structure when the part indicated by the arrow A13 in FIG. 21(B) is viewed in cross section, and FIG. 22(B) shows the structure when the part indicated by the arrow A14 in FIG. 21(B) is viewed in cross section. In FIG. 21(A), fasteners such as bolts and nuts are omitted. In the following description, the description will be made with reference to FIGS. 21(A) and 21(B), and FIGS. 22(A) and 22(B).

[0111] In this embodiment, the first flange 106a provided with the first through hole 124a has a plate thickness larger than the wall thickness of the first steel pipe column 102, and the third flange 116a provided with the second through hole 124b has a plate thickness larger than the wall thickness of the second steel pipe column 112. Thus, in addition to the first diaphragm 104, by making the plate thickness of the flange provided with the through hole larger than the wall thickness of the steel pipe column, it is possible to compensate for the decrease in strength (rigidity) against shear force, bending stress, and axial stress due to the provision of the through hole and the bolt hole.

[0112] Incidentally, the thickness of the second flange 108a may be relatively thin compared to the thickness of the third flange 116a. When the second flange 108a and the third flange 116a are sandwiched between the second reinforcing plate 132a and the fourth reinforcing plate 142a, a spacer 148b is provided on the back surface of the second flange 108a so that no gap is formed due to the difference in thickness. The spacer 148b has a thickness approximately equal to the difference in thickness between the second flange 108a and the third flange 116a, and is provided with bolt holes, and can form a bolt joint so as not to form a gap when sandwiched between the second flange 108a and the fourth reinforcing plate 142a. As shown in FIGS. 22(A) and 22(B), the spacers are provided at each bolt joint (spacer 148a at the first bolt joint 100a, spacer 148b at the second bolt joint 100b, spacer 148c at the third bolt joint 100c, and spacer 148d at the fourth bolt joint 100d).

[0113] Incidentally, for the second flange 108 and the fourth flange 118 in which no through holes are provided, the reduction in strength (rigidity) against shear force, bending stress, and axial stress due to the provision of bolt holes can be compensated for by increasing the thickness in the same manner.

[0114] The joint structure of the steel pipe column according to the present embodiment is the same as that of the third embodiment except that the thickness of the flange is increased. Therefore, in addition to the above effects, the same advantageous effects as those of the third embodiment can be obtained. Incidentally, the present embodiment can be implemented in appropriate combination with the fourth to fifth embodiments.

[0115] [Seventh Embodiment] The joint structure of the steel pipe column according to an embodiment of the present embodiment will be described with reference to FIGS. 23(A) and 23(B). FIG. 23(A) shows a developed view of the joint portion of the steel pipe column, and FIG. 23(B) shows a perspective view of the joint portion of the square steel pipe column. In FIG. 23(A), fasteners such as bolts and nuts are omitted.

[0116] In Fig. 23(A), the configurations of the first steel pipe column 102, the first diaphragm 104, the second steel pipe column 112, and the second diaphragm 114 are the same as those in the first embodiment.

[0117] On the first diaphragm 104, the first L-shaped flanges 107a, 107b and the second L-shaped flanges 109a, 109b are joined. The first L-shaped flanges 107a, 107b and the second L-shaped flanges 109a, 109b may have a shape in which two flat flanges are joined in an L-shape as shown in the figure, or may be formed of channel steel or solid metal materials not shown in the figure. Also, each of the first L-shaped flanges 107a, 107b and the second L-shaped flanges 109a, 109b may be one in which two flat flanges are arranged in an L-shape (not integrated), or may be one in which two flat flanges are arranged in an L-shape but not in contact with each other. A plurality of bolt holes 122 are provided in each L-shaped flange.

[0118] Fig. 23(A) shows a mode in which the first L-shaped flanges 107a, 107b, the second L-shaped flanges 109a, 109b are arranged corresponding to the corners of the first diaphragm 104. The first L-shaped flange 107a is arranged at the corner of the first surface 11 and the fourth surface 14, the second L-shaped flange 109a is arranged at the corner of the first surface 11 and the second surface 12, the first L-shaped flange 107b is arranged at the corner of the second surface 12 and the third surface 13, and the second L-shaped flange 109b is arranged at the corner of the third surface 13 and the fourth surface 14. With such an arrangement of the L-shaped flanges, a region surrounded by the first L-shaped flanges 107a, 107b, the second L-shaped flanges 109a, 109b is formed on the first diaphragm 104.

[0119] The widths L1 and L2 of the first L-shaped flange 107a are smaller than half of the width LD1 of the first diaphragm 104. The first L-shaped flanges 107b and the second L-shaped flanges 109a and 109b have the same size as the width of the first L-shaped flange 107a. For this reason, a first gap 110a is formed between the first L-shaped flange 107a and the second L-shaped flange 109a, a second gap 110b is formed between the second L-shaped flange 109a and the first L-shaped flange 107b, a third gap 110c is formed between the first L-shaped flange 107b and the second L-shaped flange 109b, and a fourth gap 110d is formed between the second L-shaped flange 109b and the first L-shaped flange 107a.

[0120] The third L-shaped flanges 117a and 117b and the fourth L-shaped flanges 119a and 119b are joined to the second diaphragm 114. The third L-shaped flanges 117a and 117b and the fourth L-shaped flanges 119a and 119b have substantially the same form as the first L-shaped flange 107a. The third L-shaped flanges 117a and 117b and the fourth L-shaped flanges 119a and 119b are arranged corresponding to the corners of the second diaphragm 114, similarly to the first L-shaped flanges 107a and 107b and the second L-shaped flanges 109a and 109b. Thereby, a region surrounded by the third L-shaped flanges 117a and 117b and the fourth L-shaped flanges 119a and 119b is formed on the side of the second diaphragm 114. And a fifth gap 111a is formed between the third L-shaped flange 117a and the fourth L-shaped flange 119a, a sixth gap 111b is formed between the fourth L-shaped flange 119a and the third L-shaped flange 117b, a seventh gap (111c) (not shown) is formed between the third L-shaped flange 117b and the fourth L-shaped flange 119b, and an eighth gap (111d) (not shown) is formed between the fourth L-shaped flange 119b (not shown) and the third L-shaped flange 117a.

[0121] When the first steel pipe column 102 and the second steel pipe column 112 are arranged vertically, the first L-shaped flange 107a and the third L-shaped flange 117a are arranged vertically, and are arranged such that their respective flange surfaces are flush. The second L-shaped flange 109a and the fourth L-shaped flange 119a are also arranged vertically, and are arranged such that their respective flange surfaces are flush. The same applies to the arrangement of the first L-shaped flange 107b and the third L-shaped flange 117b, and the arrangement of the second L-shaped flange 109b and the fourth L-shaped flange 119b.

[0122] The first packing plates 130a, 130b are abutted against the outer flange surfaces of the first L-shaped flange 107a and the third L-shaped flange 117a. The second packing plates 132a, 132b are abutted against the outer flange surfaces of the second L-shaped flange 109a and the fourth L-shaped flange 119a. Also, the third packing plates 140a, 140b are abutted against the inner flange surfaces of the first L-shaped flange 107a and the third L-shaped flange 117a, and the fourth packing plates 142a, 142b are abutted against the inner flange surfaces of the second L-shaped flange 109b and the fourth L-shaped flange 119a. The first packing plates 130a, 130b are plate-like members, and a plurality of bolt holes 122 are provided. The other packing plates have the same configuration.

[0123] FIG. 23(B) shows a structure in which the first L-shaped flange 107a and the third L-shaped flange 117a are sandwiched between the first packing plates 130a, 130b and the third packing plates 140a, 140b to form the first bolt joint portion 100a. The second bolt joint portion 100b and the third bolt joint portion 100c (and the fourth bolt joint portion 100d not shown) also have a structure in which the vertically arranged L-shaped flanges and packing plates are bolted together.

[0124] FIG. 23(B) shows a structure in which the first steel pipe column 102 and the second steel pipe column 112 are arranged in the vertical direction and joined by the first bolt joint portion 100a, the second bolt joint portion 100b, the third bolt joint portion 100c (and the fourth bolt joint portion 100d not shown).

[0125] As shown in FIG. 23(B), a first opening 120a is formed between the first bolt joint 100a and the second bolt joint 100b by a first gap 110a and a fifth gap 111a. Also, a second opening 120b is formed between the second bolt joint 100b and the third bolt joint 100c by a second gap 110b and a sixth gap 111b. The first opening 120a faces the first surface 11 of the first steel pipe column 102 and the first surface 21 of the second steel pipe column 112, and the first opening 120a faces the second surface 12 of the first steel pipe column 102 and the second surface 22 of the second steel pipe column 112.

[0126] FIG. 24 shows a front view of the joint structure of the steel pipe column according to the present embodiment. In FIG. 24, the first bolt joint 100a is formed at the corner where the first surface 11 and the fourth surface 14 of the first steel pipe column 102 are adjacent, and at the corner where the first surface 21 and the fourth surface 24 of the second steel pipe column 112 are adjacent. The second bolt joint 100b is formed at the corner where the first surface 11 and the second surface 12 of the first steel pipe column 102 are adjacent, and at the corner where the first surface 21 and the second surface 22 of the second steel pipe column 112 are adjacent.

[0127] The first opening 120a is an area surrounded by the first L-shaped flange 107a and the third L-shaped flange 117a, the second L-shaped flange 109a and the fourth L-shaped flange 119a, the first diaphragm 104, and the second diaphragm 114. The size of the first opening 120a can be set by the height of the first L-shaped flange 107a and the third L-shaped flange 117a, and the length in the width direction (L2 shown in FIG. 23(A)).

[0128] FIG. 25(A) shows the structure when the part indicated by the arrow A15 in FIG. 24 is viewed in cross section, and FIG. 25(B) shows the structure when the part indicated by the arrow A16 in FIG. 24 is viewed in cross section.

[0129] As shown in FIG. 25(A), on the first diaphragm 104, the first L-shaped flanges 107a, 107b, the second L-shaped flanges 109a, 109b are arranged corresponding to the respective corners of the first steel pipe column 102. Each flange is arranged at a distance, and a first gap 110a is formed on the first surface 11, a second gap 110b is formed on the second surface 12, a third gap 110c is formed on the third surface 13, and a fourth gap 110d is formed on the fourth surface 14. As shown in FIG. 25(B), on the second diaphragm 114, the third L-shaped flanges 117a, 117b, the fourth L-shaped flanges 119a, 119b are arranged corresponding to the respective corners of the second steel pipe column 112. Each flange is arranged at a distance, and a fifth gap 111a is formed on the first surface 21, a sixth gap 111b is formed on the second surface 22, a seventh gap 111c is formed on the third surface 23, and an eighth gap 111d is formed on the fourth surface 24.

[0130] As shown in FIGS. 25(A) and 25(B), with respect to the first L-shaped flange 107a and the third L-shaped flange 117a, the first packing plates 130a, 130b are abutted from the outside, the third packing plates 140a, 140b are abutted from the inside, and a first bolt joint 100a is formed by bolts 150 inserted through bolt holes 122 and nuts 152. Also, with respect to the second L-shaped flange 109a and the fourth L-shaped flange 119a, the second packing plates 132a, 132b are abutted from the outside, the fourth packing plates 142a, 142b are abutted from the inside, and a second bolt joint 100b is formed. For the first L-shaped flange 107b and the third L-shaped flange 117b, as well as the second L-shaped flange 109b and the fourth L-shaped flange 119b, third bolt joints 100c and fourth bolt joints 100d are similarly formed.

[0131] The first gap 110a and the fifth gap 111a are arranged at overlapping positions to form a first opening 120a, the second gap 110b and the sixth gap 111b are arranged at overlapping positions to form a second opening 120b, the third gap 110c and the seventh gap 111c are arranged at overlapping positions to form a third opening 120c, and the fourth gap 110d and the eighth gap 111d are arranged at overlapping positions to form a fourth opening 120d.

[0132] As shown in FIGS. 25(A) and 25(B), since the first L-shaped flanges 107a and 107b and the second L-shaped flanges 109a and 109b are attached to the first diaphragm 104, they can be made thicker than the wall thickness of the first steel pipe column 102. Similarly, since the third L-shaped flanges 117a and 117b and the fourth L-shaped flanges 119a and 119b are attached to the second diaphragm 114, they can be made thicker than the wall thickness of the second steel pipe column 112. Thereby, the strength of the bolt joint portion can be increased. On the other hand, since each L-shaped flange is arranged with a gap, an increase in the weight of the joint portion can be suppressed. In this embodiment as well, when the strength of the bolt joint portion can be sufficiently ensured, one of the gusset plates arranged on the outer side and the gusset plate arranged on the inner side can be omitted.

[0133] In the joint structure of the steel pipe column according to this embodiment, an opening used as a handhole is formed by using an L-shaped flange. The structure shown in FIGS. 23(A) and 23(B) shows a configuration in which L-shaped flanges are arranged on both sides of the first steel pipe column 102 and the second steel pipe column 112, but the present invention is not limited to this aspect. For example, as shown in FIGS. 26(A) and 26(B), an L-shaped flange and a flat plate-shaped flange may be combined.

[0134] As shown in the development view of FIG. 26(A), on the side of the first steel pipe column 102, the first L-shaped flanges 107a, 107b and the second L-shaped flanges 109a, 109b are joined to the first diaphragm 104, and on the side of the second steel pipe column 112, the fourth flanges 118a, 118b, 118c (not shown), 118d are joined to the second diaphragm 114. The first L-shaped flanges 107a, 107b and the second L-shaped flanges 109a, 109b are arranged so as to be flush with the flange surfaces of the fourth flanges 118a, 118b, 118c (not shown), 118d. The first attaching plates 130a, 130b and the third attaching plates 140a, 140b are abutted and bolted to the first L-shaped flange 107a and the fourth flanges 118a, 118d, and the second attaching plates 132a, 132b and the fourth attaching plates 142a, 142b are abutted and bolted to the second L-shaped flange 109a and the fourth flanges 118a, 1198b.

[0135] As shown in FIG. 26(B), a first opening 120a is formed between the first bolt joint 100a and the second bolt joint 100b, and a second opening 120b is formed between the second bolt joint 100b and the third bolt joint 100c. The heights of the first opening 120a and the second opening 120b substantially coincide with the heights (lengths in the material axis direction) of the first L-shaped flange 107a and the second L-shaped flange 109a. Although not shown, a third opening is similarly formed on the side of the third surface 13, and a fourth opening is formed on the side of the fourth surface 14.

[0136] Note that FIGS. 26(A) and 26(B) show an aspect in which an L-shaped flange is provided on the side of the first steel pipe column 102 and a flat flange is provided on the side of the second steel pipe column 112, but this is an example, and a flat flange may be provided on the side of the first steel pipe column 102 and an L-shaped flange may be provided on the side of the second steel pipe column 112.

[0137] In addition, ribs may be provided on the L-shaped flange. FIG. 27(A) shows a perspective view of the first L-shaped flanges 107a and 107b and the second L-shaped flanges 109a and 109b provided with ribs, and FIG. 27(B) shows a plan view thereof. The rib 166a is provided inside the first L-shaped flange 107a. Similarly, ribs 166b, 166c, and 166d are provided on the first L-shaped flange 107b, the second L-shaped flanges 109a and 109b, respectively. By providing ribs in this way, the out-of-plane rigidity of the L-shaped flange can be increased. Thereby, the local buckling resistance against the compressive axial force acting on the bolt joint can be increased, and a robust joint structure can be provided.

[0138] According to the present embodiment, an opening that can be used as a handhole is provided between four bolt joints formed by L-shaped flanges, so that the bolt joining operation can be easily performed. In other words, in the joint portion between the first steel pipe column 102 and the second steel pipe column 112, by providing four openings facing different directions, the bolt joining operation becomes easy. In such a joint structure, by arranging L-shaped flanges at four locations, the shear resistance and bending stress resistance acting on the steel pipe column can be increased. Thus, according to the present embodiment, the amount of welding at the construction site can be minimized as much as possible, the workability of bolt joining can be improved, and a joint structure in which the strength of the joint portion is equal to or greater than that of other portions can be obtained.

[0139] In addition, by making one of the flanges arranged vertically in the material axis direction for forming a bolt joint an L-shaped flange and the other a flat flange, the shear resistance and bending stress resistance acting on the steel pipe column can be increased. Also according to the present embodiment, the amount of welding at the construction site can be minimized as much as possible, the workability of bolt joining can be improved, and a joint structure in which the strength of the joint portion is equal to or greater than that of other portions can be obtained.

[0140] Also in this embodiment, similar to the first embodiment, it is possible to change the thickness of the steel pipe column in the middle of the first floor part, thicken the column diameter on the column base side (the first steel pipe column 102), and thin the column diameter on the column head side (the second steel pipe column 112), and a structure suitable for the column head part with a small bending moment can be created.

[0141] [Eighth Embodiment] This embodiment shows an aspect in which a grooved flange is provided instead of the L-shaped flange shown in the seventh embodiment. In the following description, the description will focus on the parts different from the seventh embodiment.

[0142] FIG. 28(A) shows a development view of the joint structure of the steel pipe column according to this embodiment, and FIG. 28(B) shows a perspective view thereof. In FIG. 28(A), fastening members such as bolts and nuts are omitted.

[0143] As shown in FIG. 28(A), a first grooved flange 170 and a second grooved flange 172 are joined to the first diaphragm 104. The first grooved flange 170 and the second grooved flange 172 have a grooved shape in which both ends of the flat flange are bent in the same direction. The first grooved flange 170 and the second grooved flange 172 are arranged such that the grooved sides face each other. In other words, on the first diaphragm 104, the grooved surfaces of the first grooved flange 170 and the second grooved flange 172 are arranged inward. Also, the first grooved flange 170 and the second grooved flange 172 have flange surfaces in the flat plate part along one side of the first diaphragm 104 and in the grooved part, and a plurality of bolt holes 122 are provided respectively.

[0144] The total length L3 of the bent portion in the groove shape of the first groove-shaped flange 170 and the length L4 of the bent portion in the groove shape of the second groove-shaped flange 172 have a value smaller than 1 / 2 of the width LD1 of the first diaphragm 104. Therefore, when the first groove-shaped flange 170 and the second groove-shaped flange 172 are arranged opposite to each other, the end portions bent in the groove shape do not contact each other, and they can be arranged so as to have the first gap 110a and the second gap 110b.

[0145] A third groove-shaped flange 180 and a fourth groove-shaped flange 182 are joined to the second diaphragm 114. The third groove-shaped flange 180 and the fourth groove-shaped flange 182 have the same configuration as the first groove-shaped flange 170 and the second groove-shaped flange 172, and are similarly joined to the second diaphragm 114. However, while the first gap 110a is formed on the side of the first surface 11 and the second gap 110b is formed on the side of the third surface 13, the fifth gap 111a formed by the third groove-shaped flange 180 and the fourth groove-shaped flange 182 is arranged on the side of the second surface 22, and the sixth gap 111b is arranged on the side of the fourth surface 24.

[0146] When the first steel pipe column 102 and the second steel pipe column 112 are arranged vertically, the first groove-shaped flange 170 and the third groove-shaped flange 180 are arranged such that their respective flange surfaces are flush. Similarly, the second groove-shaped flange 172 and the fourth groove-shaped flange 182 are arranged such that their respective flange surfaces are flush.

[0147] On the outer flange surfaces of the first grooved flange 170 and the third grooved flange 180, the first packing plates 130a and 130b are abutted, and on the inner flange surfaces, the third packing plates 140a and 140b are abutted to form a bolt joint. The first packing plates 130a and 130b and the second packing plates 132a and 132b have lengths that can abut against both the first grooved flange 170 and the third grooved flange 180. Also, on the outer flange surfaces of the second grooved flange 172 and the fourth grooved flange 182, the second packing plates 132a and 132b are abutted, and on the inner flange surfaces, the fourth packing plates 142a and 142b are abutted to form a bolt joint.

[0148] FIG. 28(B) shows a mode in which the first steel pipe column 102 and the second steel pipe column 112 are arranged vertically and joined together to form the first bolt joint 100a, the second bolt joint 100b, and the third bolt joint 100c (although not shown, a fourth bolt joint 100d is formed on the back side). The first bolt joint 100a is formed by sandwiching the first grooved flange 170 and the third grooved flange 180 between the first packing plate 130a and the third packing plate 140a, and the first packing plate 130b and the third packing plate 140b (not shown) and fastening them with bolts and nuts. Also, the second bolt joint 100b is formed by sandwiching the second grooved flange 172 and the fourth grooved flange 182 between the second packing plate 132a and the fourth packing plate 142a (not shown), and the second packing plate 132b and the fourth packing plate 142b (not shown) and fastening them with bolts and nuts. The third bolt joint 100c is formed in the same manner via packing plates by the second grooved flange 172 and the fourth grooved flange 182, and the fourth bolt joint 100d is formed in the same manner via packing plates by the first grooved flange 170 and the fourth grooved flange 182.

[0149] As shown in Fig. 28(B), a first opening 120a is formed on the first surface 11 side of the first steel pipe column 102 and the first surface 21 side of the second steel pipe column 112. A second opening 120b is formed on the second surface 12 side of the first steel pipe column 102 and the second surface 22 side of the second steel pipe column. The first opening 120a is formed in a region surrounded by the first grooved flange 170, the second grooved flange 172, the third grooved flange 180, and the first diaphragm 104. The second opening 120b is formed in a region surrounded by the second grooved flange 172, the third grooved flange 180 and the fourth grooved flange 182, and the second diaphragm 114.

[0150] The cross-sectional structure of the part indicated by the arrow A17 shown in Fig. 28(B) is shown in Fig. 29(A), and the cross-sectional structure of the part indicated by the other arrow A18 is shown in Fig. 29(B). As shown in Fig. 29(A), since the first grooved flange 170 and the second grooved flange 172 are arranged separately, a first gap 110a is formed on the first surface 11 side, and a second gap 110b is formed on the third surface 13 side. The first gap 110a forms the first opening 120a, and the second gap 110b forms the third opening 120c. As shown in Fig. 29(B), since the third grooved flange 180 and the fourth grooved flange 182 are arranged separately, a fifth gap 111a is formed on the second surface 22 side, and a sixth gap 111b is formed on the fourth surface 24 side. The fifth gap 111a forms the second opening 120b, and the sixth gap 111b forms the fourth opening 120d.

[0151] As shown in Figs. 29(A) and 29(B), the first opening 120a and the third opening 120c are formed by the first grooved flange 170 and the second grooved flange 172, and the second opening 120b and the fourth opening 120d are formed by the third grooved flange 180 and the fourth grooved flange 182. Therefore, the first opening 120a and the third opening 120c, and the second opening 120b and the fourth opening 120d are formed at different heights. That is, as shown in Fig. 28(B), the second opening 120b is formed at a higher position than the first opening 120a.

[0152] Thus, the joint structure of the steel pipe column according to this embodiment can provide openings with different heights on two adjacent surfaces. According to such an arrangement of the openings, for example, the workability when performing bolt joining using both hands can be improved. And by arranging such a set of openings in a slanting manner with different heights, the workability when forming bolt joints on each surface can be improved, minimizing the amount of welding at the construction site, improving the workability of bolt joining, and obtaining a joint structure in which the strength of the joint part is equal to or greater than that of other parts. Also, since not all of the openings arranged on each surface of the steel pipe column are arranged at the same height, a decrease in the strength of the joint part can be suppressed.

[0153] Also in this embodiment, similar to the first embodiment, it is possible to change the thickness of the steel pipe column in the middle of the first floor part, thicken the column diameter on the column base side (the first steel pipe column 102), and thin the column diameter on the column head side (the second steel pipe column 112), and a structure suitable for the column head part with a small bending moment can be created.

[0154] [Ninth Embodiment] This embodiment shows an aspect in which the configuration of the diaphragm is different from that of the first embodiment. In the following, the description will focus on the parts different from the first embodiment.

[0155] As shown in FIG. 30, the first diaphragm 104 may be provided with through holes 126. Also, although not shown, the second diaphragm 114 may be provided with through holes. FIG. 30 shows an aspect in which the through hole 126 is provided at approximately the center of the first diaphragm 104. The number of through holes 126 is not limited, and a plurality of them may be provided in the first diaphragm 104. By providing the through holes 126 in the first diaphragm 104, the weight of the joint part can be reduced, and the weight of the column body can be reduced. Similarly, the second diaphragm 114 may also be provided with through holes.

[0156] In addition, the column 202 shown in this embodiment can be applied to a concrete filled steel tube structure (also referred to as CFT). Through the through holes provided in the first diaphragm 104 and the second diaphragm 114, concrete is filled inside the connected first steel pipe column 102 and second steel pipe column 112. As a result, a tough structure can be formed even if the cross-sectional areas of the first steel pipe column 102 and the second steel pipe column 112 are reduced.

[0157] The configuration according to this embodiment can be implemented in appropriate combination with the second to eighth embodiments.

[0158] [Appendix] All or part of the exemplary embodiments disclosed above may include aspects described as follows in the appendix, but one embodiment of the present invention is not limited thereto.

[0159] [Appendix 1] A first diaphragm provided at one end of a first steel pipe column, a first L-shaped flange and a second L-shaped flange whose flange surfaces are arranged parallel to the material axis direction of the first steel pipe column and joined to the first diaphragm, a second diaphragm provided at one end of a second steel pipe column, a third L-shaped flange and a fourth L-shaped flange whose flange surfaces are arranged parallel to the material axis direction of the second steel pipe column and joined to the second diaphragm, a first gusset plate and a second gusset plate, wherein the second steel pipe column is arranged on the first steel pipe column such that the first diaphragm and the second diaphragm face each other, the first steel pipe column is thicker than the second steel pipe column, the first L-shaped flange and the second L-shaped flange are arranged separately, the third L-shaped flange and the fourth L-shaped flange are arranged separately, the flange surfaces of the first L-shaped flange and the third L-shaped flange are flush, the flange surfaces of the second L-shaped flange and the fourth L-shaped flange are flush, the first L-shaped flange and the third L-shaped flange are bolted together via the first gusset plate, and the second L-shaped flange and the fourth L-shaped flange are bolted together via the second gusset plate. A joint structure for steel pipe columns characterized by the above.

[0160] [Appendix 2] The joint structure for steel pipe columns according to Appendix 1, having an opening surrounded by the first L-shaped flange and the third L-shaped flange, the second L-shaped flange and the fourth L-shaped flange, the first diaphragm, and the second diaphragm.

[0161] [Appendix 3] The first steel pipe column and the second steel pipe column are square steel pipe columns, the first L-shaped flange and the second L-shaped flange are provided corresponding to the corners of the first steel pipe column, and the third L-shaped flange and the fourth L-shaped flange are provided corresponding to the corners of the second steel pipe column. The joint structure for steel pipe columns according to Appendix 1 or 2.

[0162] [Appendix 4] A steel pipe column joint structure according to any one of Appendices 1 to 3, having a third attaching plate facing the first attaching plate and a fourth attaching plate facing the second attaching plate, wherein the first L-shaped flange and the third L-shaped flange are sandwiched between the first attaching plate and the third attaching plate and bolted together, and the second L-shaped flange and the fourth L-shaped flange are sandwiched between the second attaching plate and the fourth attaching plate and bolted together.

[0163] [Appendix 5] A first diaphragm provided at one end of a first steel pipe column, a first L-shaped flange and a second L-shaped flange whose flange surfaces are arranged parallel to the material axis direction of the first steel pipe column and joined to the first diaphragm, a second diaphragm provided at one end of a second steel pipe column, a third flange whose flange surface is arranged parallel to the material axis direction of the second steel pipe column and joined to the surface of the second diaphragm, a first attaching plate and a second attaching plate, wherein the second steel pipe column is arranged on the first steel pipe column such that the first diaphragm and the second diaphragm face each other, the first steel pipe column is thicker than the second steel pipe column, the first L-shaped flange and the second L-shaped flange are arranged apart from each other, the flange surfaces of the first L-shaped flange, the second L-shaped flange and the third flange are flush with each other, the first L-shaped flange and the third flange are bolted together via the first attaching plate, and the second L-shaped flange and the third flange are bolted together via the second attaching plate.

[0164] [Appendix 6] A steel pipe column joint structure according to Appendix 5, having an opening surrounded by the first L-shaped flange, the second L-shaped flange, the third flange, and the first diaphragm.

[0165] [Appendix 7] The first steel pipe column and the second steel pipe column are square steel pipe columns. The first L-shaped flange and the second L-shaped flange are provided corresponding to the corners of the first steel pipe column. The third flange is provided corresponding to one surface of the second steel pipe column. The joint structure of the steel pipe column according to Supplementary Note 5 or 6.

[0166] [Supplementary Note 8] It has a third backing plate facing the first backing plate and a fourth backing plate facing the second backing plate. The first L-shaped flange and the third flange are sandwiched between the first backing plate and the third backing plate and bolted together. The second L-shaped flange and the third flange are sandwiched between the second backing plate and the fourth backing plate and bolted together. The joint structure of the steel pipe column according to any one of Supplementary Notes 5 to 7.

[0167] [Supplementary Note 9] A first diaphragm provided at one end of a first steel pipe column, a first grooved flange and a second grooved flange having flange surfaces arranged parallel to the material axis direction of the first steel pipe column and joined to the first diaphragm, with both ends bent in a groove shape in the same direction, a second diaphragm provided at one end of a second steel pipe column, a third grooved flange and a fourth grooved flange having flange surfaces arranged parallel to the material axis direction of the second steel pipe column and joined to the second diaphragm, with both ends bent in a groove shape in the same direction, a first gusset plate and a second gusset plate, wherein the second steel pipe column is arranged on the first steel pipe column such that the first diaphragm and the second diaphragm face each other, the first steel pipe column is thicker than the second steel pipe column, the bent ends of the first grooved flange and the second grooved flange are spaced apart and arranged opposite each other, the bent ends of the third grooved flange and the fourth grooved flange are spaced apart and arranged opposite each other, the direction in which the first grooved flange and the second grooved flange face each other is different from the direction in which the third grooved flange and the fourth grooved flange face each other, the flange surfaces of the first grooved flange and the third grooved flange are flush, the flange surfaces of the second grooved flange and the fourth grooved flange are flush, the first grooved flange and the third grooved flange are bolted together via the first gusset plate, and the second grooved flange and the fourth grooved flange are bolted together via the second gusset plate. A joint structure for steel pipe columns characterized by the above.

[0168] [Appendix 10] The joint structure for steel pipe columns according to Appendix 9, having a first opening surrounded by the first grooved flange, the second grooved flange, the third grooved flange, and the first diaphragm, and a second opening surrounded by the third grooved flange, the fourth grooved flange, the first grooved flange, and the second diaphragm.

[0169] [Appendix 11] The joint structure for steel pipe columns according to Appendix 10, wherein the first opening and the second opening are arranged obliquely.

[0170] [Appendix 12] It has a third attachment plate facing the first attachment plate and a fourth attachment plate facing the second attachment plate, and the first grooved flange and the third grooved flange are sandwiched between the first attachment plate and the third attachment plate and bolted together, and the second grooved flange and the third grooved flange are sandwiched between the second attachment plate and the fourth attachment plate and bolted together. The joint structure of the steel pipe column according to any one of Appendices 9 to 11.

[0171] [Appendix 13] The first steel pipe column and the second steel pipe column are square steel pipe columns, the first grooved flange and the second grooved flange are provided with the bent ends corresponding to the corners of the first steel pipe column, and the third grooved flange and the fourth grooved flange are provided with the bent ends corresponding to the corners of the second steel pipe column. The joint structure of the steel pipe column according to any one of Appendices 9 to 12.

Explanation of Signs

[0172] 100 ··· Bolt joint, 101 ··· Bolt joint, 102 ··· First steel pipe column, 104 ··· First diaphragm, 106 ··· First flange, 107 ··· First L-shaped flange, 108 ··· Second flange, 109 ··· Second L-shaped flange, 110 ··· Gap, 111 ··· Gap, 112 ··· Second steel pipe column, 114 ··· Second diaphragm, 116 ··· Third flange, 117 ··· Third L-shaped flange, 118 ··· Fourth flange, 119 ··· Fourth L-shaped flange, 120 ··· Opening, 122 ··· Bolt hole, 124 ··· Through hole, 126 ··· Through hole, 130 ··· First gusset plate, 132 ··· Second gusset plate, 140 ··· Third gusset plate, 142 ··· Fourth gusset plate, 144 ··· Fifth gusset plate, 146 ··· Sixth gusset plate, 148 ··· Spacer, 150 ··· Bolt, 152 ··· Nut, 160 ··· First reinforcing plate, 162 ··· Second reinforcing plate, 164 ··· Notch, 166 ··· Rib, 170 ··· First grooved flange, 172 ··· Second grooved flange, 180 ··· Third grooved flange, 182 ··· Fourth grooved flange, 200 ··· Foundation beam, 202 ··· Column, 204 ··· Beam

Claims

1. a first diaphragm provided at one end of the first steel pipe column; a pair of flanges whose flange surfaces are arranged substantially parallel to the material axis direction of the first steel pipe column and joined to the first diaphragm; a second diaphragm provided at one end of the second steel pipe column; a pair of flanges whose flange surfaces are arranged substantially parallel to the material axis direction of the second steel pipe column and joined to the second diaphragm; a first gusset plate and a second gusset plate; a pair of flanges joined to the first diaphragm are arranged so as to be separated and opposed across the central axis of the first steel pipe column; a pair of flanges joined to the second diaphragm are arranged so as to be separated and opposed across the central axis of the second steel pipe column; the column diameter of the first steel pipe column is larger than the column diameter of the second steel pipe column; the second steel pipe column is arranged on the first steel pipe column such that the flange surfaces of the pair of flanges joined to the first diaphragm and the flange surfaces of the pair of flanges joined to the second diaphragm are flush; the first steel pipe column is joined to a first beam; the second steel pipe column is joined to a second beam; a first bolt joint portion in which one of the pair of flanges joined to the first diaphragm and one of the pair of flanges joined to the second diaphragm are bolted together via the first gusset plate, and a second bolt joint portion in which the other of the pair of flanges joined to the first diaphragm and the other of the pair of flanges joined to the second diaphragm are bolted together via the second gusset plate; the first bolt joint portion and the second bolt joint portion are provided between the first beam and the second beam A joint structure for steel pipe columns, characterized in that.

2. a pair of flanges arranged so as to sandwich the region where the pair of flanges joined to the first diaphragm are separated; a pair of flanges arranged so as to sandwich the region where the pair of flanges joined to the second diaphragm are separated; a third gusset plate and a fourth gusset plate; arranged such that the flange surfaces of the pair of flanges arranged so as to sandwich the region where the pair of flanges joined to the first diaphragm are separated and the flange surfaces of the pair of flanges arranged so as to sandwich the region where the pair of flanges joined to the second diaphragm are separated are flush One of a pair of flanges arranged to sandwich a region where a pair of flanges joined to the first diaphragm are separated and one of a pair of flanges arranged to sandwich a region where a pair of flanges joined to the second diaphragm are separated are bolted together via the third spacer plate, and the other of the pair of flanges arranged to sandwich the region where the pair of flanges joined to the first diaphragm are separated and the other of the pair of flanges arranged to sandwich the region where the pair of flanges joined to the second diaphragm are separated are bolted together via the fourth spacer plate. The joint structure of a steel pipe column according to claim 1.

3. A pair of flanges joined to the first diaphragm and a pair of flanges arranged to sandwich a region where the pair of flanges joined to the first diaphragm are separated are arranged with a space therebetween so that they can be used as hand holes. A pair of flanges joined to the second diaphragm and a pair of flanges arranged to sandwich a region where the pair of flanges joined to the second diaphragm are separated are arranged with a space therebetween so that they can be used as hand holes. The joint structure of a steel pipe column according to claim 2.

4. A first diaphragm provided at one end of a first steel pipe column, A first flange and a second flange whose flange surfaces are arranged substantially parallel to the material axis direction of the first steel pipe column and joined to the first diaphragm, A second diaphragm provided at one end of a second steel pipe column, A third flange and a fourth flange whose flange surfaces are arranged substantially parallel to the material axis direction of the second steel pipe column and joined to the second diaphragm, A first spacer plate and a second spacer plate, The column diameter of the first steel pipe column is larger than the column diameter of the second steel pipe column, The second steel pipe column is arranged on the first steel pipe column so that the first diaphragm and the second diaphragm face each other, The first steel pipe column is joined to a first beam, The second steel pipe column is joined to a second beam, The first flange is longer in the material axis direction than the fourth flange, and the third flange is longer in the material axis direction than the second flange. A first bolt joint portion in which the first flange and the fourth flange are bolted via the first backing plate, and a second bolt joint portion in which the second flange and the third flange are bolted via the second backing plate, wherein the first bolt joint portion and the second bolt joint portion are provided between the first beam and the second beam. A joint structure for a steel pipe column, characterized by the above.

5. The first flange has a first through hole that can be used as a hand hole. The third flange has a second through hole that can be used as a hand hole. The joint structure for a steel pipe column according to claim 4.

6. The first flange has a first region provided with first bolt holes for forming a bolt joint. The second flange has a second region provided with second bolt holes for forming a bolt joint. The third flange has a third region provided with third bolt holes for forming a bolt joint. The fourth flange has a fourth region provided with fourth bolt holes for forming a bolt joint. The first through hole is disposed between one end of the first diaphragm side of the first flange and the first region. The second through hole is disposed between one end of the second diaphragm side of the third flange and the third region. The first backing plate abuts against the first region and the fourth region. The second backing plate abuts against the second region and the third region. The joint structure for a steel pipe column according to claim 5.

7. The first steel pipe column and the second steel pipe column are square steel pipe columns. The joint structure for a steel pipe column according to any one of claims 1 to 6.

8. The first diaphragm is thicker than the second diaphragm. The joint structure for a steel pipe column according to any one of claims 1 to 7.

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