JP7750653B2 - Steel pipe column joint structure - Google Patents

Description

One embodiment of the present invention relates to a joint structure for steel pipe columns used in buildings.

Welding and bolting are known methods for joining steel frame components. While welding can ensure sufficient strength, it requires advanced skills and time, and it has been pointed out that quality and performance are affected by the skill of the worker. In contrast, bolting has the advantage of shortening construction time and facilitating quality control. Bolted joints are used to join various steel frame components; for example, structures for joining steel pipe columns to H-shaped steel and joining steel pipe columns to each other have been disclosed (see Patent Documents 1 and 2).

Japanese Patent Application Publication No. 5-179702 Japanese Patent Application Laid-Open No. 2004-293196

When bolting steel frame components, components with an open cross-section, such as H-section steel, can be easily bolted. However, when bolting tubular components, such as steel pipe columns, construction is difficult. Furthermore, it is necessary to ensure that the strength of the bolted parts does not decrease compared to the rest of the steel pipe column.

One of the purposes of the present invention is to provide a joint structure for steel pipe columns that solves these problems.

A steel pipe pole joint structure according to one embodiment of the present invention includes a first flange provided at one end of a first steel pipe pole, a second flange provided at one end of a second steel pipe pole, and a splice plate in contact with the first flange and the second flange. The splice plate has ribs extending in the axial direction of the first steel pipe pole and the second steel pipe pole, and the first steel pipe pole and the second steel pipe pole are bolted together using the first flange, the second flange, and the splice plate.

In a steel pipe pole joint structure according to one embodiment of the present invention, ribs are provided on the splice plate that abuts the flange, preventing the joint from buckling when a load is applied to the steel pipe pole.

1A and 1B show a joint structure of a steel pipe pole according to one embodiment of the present invention, in which FIG. 1A is a developed view and FIG. 1B is a perspective view. FIG. 1B is a front view of a joint structure of a steel pipe column according to an embodiment of the present invention. 3 is a cross-sectional schematic view of the joint structure of a steel pipe pole according to one embodiment of the present invention, shown in FIG. 2 . 1A and 1B show a joint structure of a steel pipe pole according to one embodiment of the present invention, in which FIGS. 1A and 1B show its development views. 4A and 4B show a cross-sectional schematic structure of the joint structure of a steel pipe pole according to one embodiment of the present invention. FIG. 1 shows a front view of a joint structure of a steel pipe column according to an embodiment of the present invention. 1A and 1B show a joint structure of a steel pipe pole according to one embodiment of the present invention, in which FIG. 1A is a developed view and FIG. 1B is a perspective view. 8 is a cross-sectional schematic view of the joint structure of a steel pipe pole according to one embodiment of the present invention, shown in FIG. 7. 1A and 1B show a joint structure of a steel pipe pole according to one embodiment of the present invention, in which FIGS. 1A and 1B show its development views. 9A and 9B show a cross-sectional schematic structure of the joint structure of a steel pipe pole according to one embodiment of the present invention. 1A and 1B show a joint structure of a steel pipe pole according to one embodiment of the present invention, in which FIG. 1A is a developed view and FIG. 1B is a perspective view. 12 is a cross-sectional schematic view of the joint structure of a steel pipe pole according to one embodiment of the present invention, showing the joint structure shown in FIG. FIG. 1 shows a development view of a joint structure of a steel pipe column according to one embodiment of the present invention. 1A and 1B show a joint structure of a steel pipe pole according to one embodiment of the present invention, in which FIG. 1A is a developed view and FIG. 1B is a perspective view. 15 is a cross-sectional schematic view of the joint structure of a steel pipe pole according to one embodiment of the present invention, shown in FIG. 14 . 1A and 1B show a joint structure of a steel pipe pole according to one embodiment of the present invention, in which FIGS. 1A and 1B show its development views. 16(A) and 16(B) show a cross-sectional schematic structure of the joint structure of a steel pipe pole according to one embodiment of the present invention. 1A and 1B show a joint structure of a steel pipe pole according to one embodiment of the present invention, in which FIG. 1A is a developed view and FIG. 1B is a perspective view. FIG. 19 shows a cross-sectional schematic structure of the joint structure shown in FIG. 18, which is a joint structure of a steel pipe pole according to one embodiment of the present invention. 1A and 1B show a joint structure of a steel pipe pole according to one embodiment of the present invention, in which FIGS. 1A and 1B show its development views. 20(A) and 20(B) show a cross-sectional schematic structure of the joint structure of a steel pipe pole according to one embodiment of the present invention. 1A and 1B show a joint structure of a steel pipe pole according to one embodiment of the present invention, in which FIG. 1A is a developed view and FIG. 1B is a perspective view. FIG. 23 shows a cross-sectional schematic structure of the joint structure shown in FIG. 22, which is a joint structure of a steel pipe pole according to one embodiment of the present invention. 1A and 1B show a joint structure of a steel pipe pole according to one embodiment of the present invention, in which FIG. 1A is a developed view and FIG. 1B is a perspective view. FIG. 25 shows a cross-sectional schematic structure of the joint structure shown in FIG. 24, which is a joint structure of a steel pipe pole according to one embodiment of the present invention. 1A and 1B show a joint structure of a steel pipe pole according to one embodiment of the present invention, in which FIGS. 1A and 1B show its development views. 26(A) and 26(B) show a cross-sectional schematic structure of the joint structure of a steel pipe pole according to one embodiment of the present invention. 1A and 1B show a joint structure of a steel pipe pole according to one embodiment of the present invention, in which FIG. 1A is a developed view and FIG. 1B is a perspective view. FIG. 29 shows a cross-sectional schematic structure of the joint structure shown in FIG. 28, which is a joint structure of a steel pipe pole according to one embodiment of the present invention. 1A and 1B show a joint structure of a steel pipe pole according to one embodiment of the present invention, in which FIGS. 1A and 1B show its development views. 30(A) and (B) show cross-sectional schematic structures of the joint structure of a steel pipe pole according to one embodiment of the present invention. 1A and 1B show a joint structure of a steel pipe pole according to one embodiment of the present invention, in which FIG. 1A is a developed view and FIG. 1B is a perspective view. FIG. 33 shows a cross-sectional schematic structure of the joint structure shown in FIG. 32, which is a joint structure of a steel pipe pole according to one embodiment of the present invention. 1A and 1B show a joint structure of a steel pipe pole according to one embodiment of the present invention, in which FIG. 1A is a developed view and FIG. 1B is a perspective view. FIG. 35 shows a cross-sectional schematic structure of the joint structure shown in FIG. 34, which is a joint structure of a steel pipe pole according to one embodiment of the present invention. 1A and 1B show a joint structure of a steel pipe pole according to one embodiment of the present invention, in which FIGS. 1A and 1B show its development views. 36(A) and 36(B) show a cross-sectional schematic structure of the joint structure of a steel pipe column according to one embodiment of the present invention. 36(A) and 36(B) show a cross-sectional schematic structure of the joint structure of a steel pipe column according to one embodiment of the present invention. 1A and 1B show a joint structure of a steel pipe pole according to one embodiment of the present invention, in which FIG. 1A is a developed view and FIG. 1B is a perspective view. 35A and 35B show a cross-sectional schematic structure of the joint structure of a steel pipe pole according to one embodiment of the present invention. 1A and 1B show a joint structure of a steel pipe pole according to one embodiment of the present invention, in which FIGS. 1A and 1B show its development views. 41(A) and 41(B) show a cross-sectional schematic structure of the joint structure of a steel pipe column according to one embodiment of the present invention. 41(A) and 41(B) show a cross-sectional schematic structure of the joint structure of a steel pipe column according to one embodiment of the present invention. 1A and 1B show a joint structure of a steel pipe pole according to one embodiment of the present invention, in which FIG. 1A is a developed view and FIG. 1B is a perspective view. 45A and 45B show a cross-sectional schematic structure of the joint structure of a steel pipe pole according to one embodiment of the present invention.

The following describes embodiments of the present invention with reference to the drawings. However, the present invention encompasses many different aspects and should not be construed as being limited to the embodiments exemplified below. For clarity, the drawings may show schematic representations of the width, thickness, shape, etc. of each part compared to the actual aspect. However, these are merely examples and do not limit the scope of the present invention. Furthermore, in this specification, when an element depicted in one drawing is identical to or corresponds to an element depicted in another drawing, the same reference numeral (or a reference numeral with a, b, etc. suffixed to the reference numeral) may be used, and repeated description may be omitted as appropriate. Furthermore, the letters "first" and "second" attached to each element are convenient labels used to distinguish between elements and have no further meaning unless otherwise specified.

The following embodiments describe joint structures for steel pipe columns, but one embodiment of the present invention is not limited to this form and can be equally applied to joint structures for circular steel pipes and deformed steel pipes.

[First embodiment]
1(A) and (B) show a steel pipe pole joint structure according to one embodiment of the present invention. In FIG. 1, (A) shows a developed view of the steel pipe pole joint structure, and (B) shows a perspective view thereof. The steel pipe pole joint structure according to one embodiment of the present invention has a structure in which a first steel pipe pole and a second steel pipe pole are joined by a bolt joint. FIGS. 1(A) and (B) exemplify a case in which the steel pipe pole is a square steel pipe pole. Note that fastening members such as bolts and nuts are omitted from FIG. 1(A).

The steel pipe pole joint structure shown in Figures 1(A) and (B) has a structure in which a first steel pipe pole 102 and a second steel pipe pole 112 are arranged one above the other and bolted together using flanges and splices. The first steel pipe pole 102 has a first flange 104 at one end (lower end), and the second steel pipe pole 112 has a second flange 114 at one end (upper end). The first flange 104 and the second flange 114 are provided corresponding to each face of the respective steel pipe poles. In other words, four first flanges 104 are provided corresponding to the four faces of the first steel pipe pole 102, and four second flanges 114 are provided corresponding to the four faces of the second steel pipe pole 112.

The first steel pipe pole 102 and the second steel pipe pole 112 according to this embodiment have the same cross-sectional shape and the same cross-sectional dimensions. The thicknesses of the first flange 104 and the second flange 114 may be the same as those of the first steel pipe pole 102 and the second steel pipe pole 112, but this embodiment shows an example in which the first flange 104 and the second flange 114 are formed thicker. That is, in this embodiment, the thickness of the first flange 104 is set so that the total cross-sectional area of the four first flanges 104 is larger than the area of a cross section perpendicular to the material axis direction of the first steel pipe pole 102. The same applies to the relationship between the thickness of the second flange 114 and the second steel pipe pole 112.

For example, the thickness of the first flange 104 and the second flange 114 is set to be 1.2 to 3 times, and preferably 1.5 to 2 times, the thickness of the first steel pipe column 102 and the second steel pipe column 112. In this way, by making the thickness of the first flange 104 and the second flange 114 greater than the thickness of the first steel pipe column 102 and the second steel pipe column 112, the effective cross-sectional area of the joint 100 can be increased, thereby improving the strength of the joint 100.

The length of the first flange 104 and the second flange 114 (the length in the axial direction of the steel pipe pole) is long enough to allow multiple bolts to be arranged in series, and their width is smaller than the outer diameter of the first steel pipe pole 102 and the second steel pipe pole 112.

The first flange 104 is welded to one end (lower end) of the first steel pipe column 102, and the second flange 114 is welded to one end (upper end) of the second steel pipe column 112. The first steel pipe column 102 and the second steel pipe column 112 are joined using the first flange 104 and the second flange 114. The joint 100 is provided with a splice plate that abuts the first flange 104 and the second flange 114. Figure 1(A) shows an example in which the first splice plate 105 is applied to the outside of the first flange 104 and the second flange 114, and the second splice plate 115 is applied to the inside.

The first steel pipe column 102, the second steel pipe column 112, the first flange 104, the second flange 114, the first splice plate 105, and the second splice plate 115 are formed from a steel material. For example, these components are formed from structural rolled steel.

In this embodiment, the first splice plate 105 and the second splice plate 115 are divided into two, left and right halves. Each of the left and right split first splice plates 105a, 105b and second splice plates 115a, 115b is provided with a rib 120. The rib 120 extends in the vertical direction of the first splice plates 105a, 105b and second splice plates 115a, 115b and is provided along one end of each. In other words, the rib 120 is provided from one end to the other end of the first splice plates 105a, 105b and second splice plates 115a, 115b in a direction parallel to the material axis direction of the steel pipe column.

The first support plates 105a, 105b and the second support plates 115a, 115b have an L-shaped cross section. The first support plates 105a, 105b and the second support plates 115a, 115b have a first portion that abuts the flange and a second portion that bends and protrudes from the first portion, and the second portion forms a rib 120.

In this embodiment, the length of the rib 120 (length in the material axial direction) is the same as the length of the splice plate, and the width is the same as or approximately the same as the thickness of the splice plate. The height of the rib 120 (the height that protrudes from the surface of the splice plate) is set appropriately depending on the strength required of the joint 100. For example, the height of the rib 120 is set in the range of 0.2 to 0.5 times the width of the flange. Increasing the thickness of the splice plate can increase the strength of the joint 100, and increasing the width and/or height of the rib 120 can increase the resistance to loads that cause buckling.

The first support plate 105 (105a, 105b) and the second support plate 115 (115a, 115b) each have a length (length in the material axis direction) that allows them to abut against both the first flange 104 and the second flange 114. Bolt holes are provided in the first flange 104, the second flange 114, the first support plate 105 (105a, 105b), and the second support plate 115 (115a, 115b). The first flange 104 and the second flange 114 are sandwiched between the first support plate 105 (105a, 105b) located on the outside and the second support plate 115 (115, 115b) located on the inside and bolted together. As a result, as shown in Figure 1(B), the joint structure of the steel pipe column includes a joint 100 formed by the first flange 104, the second flange, the first splice plates 105 (105a, 105b), and the second splice plates 115 (115a, 115b).

Note that one of the first splice plates 105 (105a, 105b) and the second splice plates 115 (115a, 115b) may be omitted. In other words, if sufficient bonding strength can be ensured using only one of the first splice plates 105 (105a, 105b) and the second splice plates 115 (115a, 115b), the other splice plate may be omitted.

Figures 1(A) and (B) show an example in which the ribs 120 of the first support plates 105a, 105b and the second support plates 115a, 115b are located in the center of the flange. Although not shown, the ribs 120 may also be located on both sides of the flange, or in the center and end portions.

A first auxiliary plate 108 is provided on the first steel pipe column 102 adjacent to the first flange 104, and a second auxiliary plate 118 is provided on the second steel pipe column 112 adjacent to the second flange 114. The first auxiliary plate 108 and the second auxiliary plate 118 are formed of steel and are welded to the first steel pipe column 102 and the second steel pipe column 112, respectively. As shown in FIG. 1(B) , with the first steel pipe column 102 and the second steel pipe column 112 joined, the first auxiliary plate 108, the first flange 104, the second flange 114, and the second auxiliary plate 118 are arranged side by side in the material axis direction, and a first support plate 105 (with a second support plate 115 on the back side) is provided so as to abut against the first flange 104 and the second flange 114.

When the thickness of the first flange 104 is greater than the thickness of the first steel pipe pole 102, the first flange 104 is provided so as to protrude from the outer surface of the first steel pipe pole 102 by the difference in thickness. The first auxiliary plate 108 may have a thickness equal to the height of the protruding step and be provided so as to be flush with the outer surface of the first flange 104. The second auxiliary plate 118 is similarly provided on the second steel pipe pole 112.

Figure 2 shows a front view of the steel pipe pole joint structure shown in Figure 1 (B). The first flange 104 is joined to the first steel pipe pole 102, and the second flange 114 is joined to the second steel pipe pole 112. The first flange 104 is positioned so that its back side is flush with the inner surface of the first steel pipe pole 102, and the second flange 114 is positioned so that its back side is flush with the inner surface of the second steel pipe pole 112, and they are welded together. A backing metal 132 may be provided on the weld 130a from the inside of the steel pipe pole. The weld 130a is formed at the boundary between the first flange 104 and the first steel pipe pole 102 and the boundary between the second flange 114 and the second steel pipe pole 112. The first flange 104 is provided so as to protrude from the column surface of the first steel pipe column 102 by the difference in thickness, and the second flange 114 is provided so as to protrude from the column surface of the second steel pipe column 112 by the difference in thickness.

The first auxiliary plate 108 is welded to the column surface of the first steel pipe column 102, and the second auxiliary plate 118 is welded to the column surface of the second steel pipe column 112. Welds 130b are provided along the outer periphery of the first auxiliary plate 108 and the second auxiliary plate 118. Furthermore, the first auxiliary plate 108 is welded to the first flange 104 and the first steel pipe column 102 at welds 130a, and the second auxiliary plate 118 is welded to the second flange 114 and the second steel pipe column 112 at welds 130a.

By welding the first auxiliary plate 108 to the first steel pipe column 102 adjacent to the first flange 104 and the second auxiliary plate 118 to the second steel pipe column 112 adjacent to the second flange 114, the thickness of the portion adjacent to the joint between the first steel pipe column 102 and the second steel pipe column 112 can be made approximately the same as the thickness of the first flange 104 and the second flange 114. In other words, the first auxiliary plate 108 and the second auxiliary plate 118 increase the effective thickness of the steel pipe column, thereby increasing the strength of the joint 100. Furthermore, in this embodiment, the first support plate 105 and the second support plate 115 are provided with ribs 120, which prevents the joint 100 from buckling when a load is applied to the steel pipe column.

There are no particular limitations on the dimensions of the first auxiliary plate 108 and the second auxiliary plate 118 in a plan view. For example, they may have dimensions that are approximately the same as the length and width of the first flange 104 and the second flange 114.

Figure 3 shows a schematic cross-sectional structure between A1 and B1 shown in Figure 2, illustrating the structure of the joint 100 when the cut surface is viewed from below in the direction of the first steel pipe column 102. The joint 100 has a structure in which first flanges 104 are provided corresponding to each face of the first steel pipe column 102 and are sandwiched between first auxiliary plates 108a, 108b and second auxiliary plates 118a, 118b and bolted together. Figure 3 shows the joints 100 formed on each face of the first steel pipe column 102 as joints 100a, 100b, 100c, and 100d in a clockwise direction.

The joint 100a is formed by a first flange 104 and first and second support plates 105 (105a, 105b) that sandwich the first flange 104. The rib 120a of the first support plate 105 (105a, 105b) is arranged to protrude outward from the first steel pipe column 102, and the rib 120b of the second support plate 115 (115a, 115b) is arranged to protrude inward from the first steel pipe column 102. This structure is also the same for joints 100b, 100c, and 100d.

The joint 100a is spaced apart from the adjacent joints 100b and 100d. In other words, the joints 100a, 100b, 100c, and 100d formed on each face of the first steel pipe column 102 are spaced apart from adjacent joints. This arrangement of joints results in openings 122 being formed at the corners of the first steel pipe column 102. The openings 122 form areas that connect the space inside the joint 100 with the outside. Although not shown, a similar structure is also formed on the side of the second steel pipe column 112.

The steel pipe column joint structure according to this embodiment has openings 122 corresponding to the corners of the steel pipe column, facilitating the construction of bolted joints. As shown in Figure 3, if a rib 120b protrudes from the inside of the first steel pipe column 102, the rib 120b may become an obstacle, making the construction of the bolted joint difficult. However, the formation of openings 122 makes the construction of the bolted joint easier. That is, a worker can use openings 122 to insert a bolt into a bolt hole from the inside and easily perform the bolting work using a tool.

As shown in Figure 1 (B), the height of the opening 122 can be approximately the same as the total length of the first flange 104 (the length in the axial direction of the steel pipe pole) and the second flange 114 (same), and the width of the opening 122 can be set appropriately depending on the widths of the first flange 104 and the second flange 114. This makes it possible to form an opening 122 large enough for workers to insert bolts, tools, etc. inside the steel pipe pole and work there.

Figures 4(A) and (B) show development views of the joint structure of a steel pipe column according to this embodiment. Also, Figures 5(A) and (B) show a cross-sectional schematic structure of the joint portion of this joint structure.

Figure 4(A) shows an exploded view in which ribs 120 are provided on the first support plate 105 (105a, 105b) and the second support plate 115 is flat, and Figure 5(A) shows a schematic cross-sectional structure of the joint 100. By providing ribs 120 on at least the first support plate 105, the strength of the joint 100 can be increased and buckling can be prevented.

Figure 4(B) shows an exploded view in which ribs 120 are provided on the second support plate 115 (115a, 115b) and the first support plate 105 is flat, and Figure 5(B) shows a schematic cross-sectional structure of the joint 100. In this example, by not providing ribs on the first support plate 105, a structure can be created in which the ribs do not protrude from the column, thereby not affecting the appearance or design.

The steel pipe pole joint structure according to this embodiment can increase the strength of the steel pipe pole joint 100 by providing a rib 120 on one or both of the first splice plate 105 and the second splice plate 115. In other words, providing the rib 120 can prevent the joint 100 from buckling when a load is applied to the steel pipe pole. Furthermore, the strength of the joint 100 is also increased by having the thickness of the first flange 104 and the second flange 114 greater than the thickness of the first steel pipe pole 102 and the second steel pipe pole 112.

In addition, the steel pipe pole joint structure according to this embodiment includes a first auxiliary plate 108 welded to the first steel pipe pole 102 so as to abut the upper end of the first flange 104, and a second auxiliary plate 118 welded to the second steel pipe pole 112 so as to abut the lower end of the second flange 114. This allows stress acting from the first flange 104 and the second flange 114 toward the first steel pipe pole 102 and the second steel pipe pole 112 to be dispersed to the first auxiliary plate 108 and the second auxiliary plate 118. This prevents stress from concentrating at the interface between the first steel pipe pole 102 and the first flange 104, and at the interface between the second steel pipe pole 112 and the second flange 114, thereby increasing the strength of the joint 100.

[Modification 1]
Figure 6 shows an embodiment in which the attachment positions of the first flange 104 and the second flange 114 are different from those in Figures 1 to 3. Figure 4 shows a front view of a steel pipe pole joint structure, illustrating a structure in which the first flange 104 is provided flush with the outer surface of the first steel pipe pole 102, and the second flange 114 is provided flush with the outer surface of the second steel pipe pole 112. In addition, a first auxiliary plate 108 is provided on the inner surface of the first steel pipe pole 102 adjacent to the first flange 104, and a second auxiliary plate 118 is provided on the inner surface of the second steel pipe pole 112 adjacent to the second flange 114.

The first splice plate 105 and the second splice plate 115 have the same configuration. Even if the mounting positions of the first flange 104 and the second flange 114 are changed in this way, the first splice plate 105 and the second splice plate 115 can be used to join the first steel pipe column 102 and the second steel pipe column 112.

Second Embodiment
This embodiment shows an example in which the structure of the splice plate is different from that of the joint structure of the steel pipe pole shown in the first embodiment. In the following explanation, the differences from the first embodiment will be mainly described.

Figures 7(A) and (B) show the joint structure of a steel pipe pole according to this embodiment. In Figure 7, (A) shows an exploded view of the joint structure of a steel pipe pole, and (B) shows a perspective view thereof. Figure 8 shows a schematic cross-sectional view of the joint structure of a steel pipe pole. In this embodiment, the first splice plate 106 and the second splice plate 116 have a structure in which a rod-shaped member forming a rib 120 is joined to a plate-shaped member forming the splice plate. Note that fastening members such as bolts and nuts are omitted from Figure 7(A).

As shown in FIG. 7(A), the first splice plate 106 and the second splice plate 116 are provided with ribs 120a, 120b that run vertically through their central portions. The ribs 120a, 120b are provided from the upper end to the lower end of each of the first splice plate 106 and the second splice plate 116, along a direction parallel to the material axis direction of the first steel pipe column 102 and the second steel pipe column 112. As shown in FIG. 8, the ribs 120a, 120b are welded to the first splice plate 106 and the second splice plate 116. A weld 124a is formed where the rib 120a abuts the first splice plate 106, and a weld 124b is formed where the rib 120b abuts (note that the welds of the ribs 120a, 120b are omitted from FIGS. 7(A) and (B)). By welding the ribs 120a, 120b to the first splice plate 106 and the second splice plate 116, the strength of the joint 100 can be increased. For example, this can prevent the joint 100 from buckling when a load is applied to the steel pipe column.

By using separate components (rod-shaped or plate-shaped components) to form the ribs 120a, 120b and welding them to the plate-shaped component, the width and thickness of the ribs 120a, 120b on the splice plate can be selected appropriately. This allows the size of the ribs 120a, 120b to be designed according to the strength required of the joint 100. For example, by increasing the width and height of the ribs 120a, 120b, the buckling load (the load at which the joint buckles) can be increased, thereby improving the strength of the steel pipe column.

As shown in Figures 7(B) and 8, an opening 122 is formed in the joint 100. By providing the opening 122, bolt connection can be easily performed even if ribs 120a, 120b are provided on the first splice plate 106 and the second splice plate 116. Note that with respect to the first splice plate 106 placed on the outside of the steel pipe column, the rib 120a may be provided from the beginning, or the rib 120a may be welded after the bolt connection is formed.

Figures 9(A) and (B) show development views of the joint structure of a steel pipe column according to this embodiment. Also, Figures 10(A) and (B) show a cross-sectional schematic of the joint portion of this joint structure.

Figure 9(A) shows a case where ribs 120a are provided on the first support plate 106 and the second support plate 116 is flat and has no ribs, and Figure 10(A) shows a schematic cross-sectional structure of the joint 100. By providing ribs 120a on the first support plate 106, the strength of the joint 100 can be increased and buckling can be prevented.

Figure 9(B) shows a case where ribs 120b are provided on the second support plate 116 and the first support plate 106 is flat and has no ribs, and Figure 10(B) shows a schematic cross-sectional structure of the joint 100. In this example, by not providing ribs on the first support plate 106, a structure can be created in which ribs do not protrude from the column body, thereby not affecting the appearance or design. In this way, even in a structure in which ribs are provided on only one of the first support plate 106 and the second support plate 116, the buckling load (the load at which the joint buckles) can be increased, thereby increasing the strength of the steel pipe column.

In this embodiment, the ribs 120a and 120b are arranged in a direction parallel to the material axis direction, but the arrangement of the ribs 120a and 120b is not limited to this, and they may be arranged diagonally from one end of the support plate to the other diagonal end.

The joint structure of the steel pipe pole according to this embodiment is the same as that of the first embodiment, except for the shape of the rib, and can achieve the same effects.

[Third embodiment]
This embodiment shows another example of the joint structure of a steel pipe pole shown in the second embodiment, in which the structure of the splice plate is different. In the following description, the differences from the second embodiment will be mainly described.

Figures 11(A) and (B) show the joint structure of a steel pipe pole according to this embodiment. In Figure 11, (A) shows an exploded view of the joint structure of a steel pipe pole, and (B) shows a perspective view thereof. Figure 12 shows a schematic cross-sectional view of the joint structure of a steel pipe pole. In this embodiment, the first splice plate 107 and the second splice plate 117 also have a structure in which ribs 120c are provided on plate-like members, but the attachment position of the ribs 120c differs from that of the second embodiment. Note that fastening members such as bolts and nuts are omitted from Figure 11(A).

As shown in Figure 11(A), the first support plate 107, which is disposed on the outside of the first flange 104 and the second flange 114, is provided with multiple ribs 120c, while the second support plate 117, which is disposed on the inside, is configured without ribs. As shown in Figures 11(A) and (B), the ribs 120c are provided along the material axis direction from the top to the bottom of the first support plate 107. Figures 11(A) and (B) show an embodiment in which the ribs 120c are provided on both the left and right ends of the first support plate 107, but the attachment position of the ribs 120c is not limited to that shown in the figure; they may be provided inward from the left and right ends as long as they do not interfere with bolts and nuts when the first support plate 107 is attached to the first flange 104 and the second flange 114. As shown in Figure 12, the rib 120c abuts against the first splice plate 107 and is welded at the weld 124c (note that the weld of the rib 120c is omitted in Figures 11(A) and (B)).

As shown in Figures 11(B) and 12, the joint 100 has an opening 122, making it easy to perform bolt joint construction even if the first splice plate 107 is provided with a rib 120c. The first splice plate 107 may be provided with the rib 120c from the beginning, or the rib 120c may be welded after the bolt joint is formed.

In this way, even if the first support plate 107 is provided with multiple ribs 120 and the second support plate 117 is not provided with ribs, it is possible to obtain the same strength as the joint structure in the second embodiment, in which ribs are provided on both support plates.

[Modification 2]
13, a configuration can be adopted in which a rib 120a is provided in the center of the first splice plate 107 and ribs 120c are provided on both sides, and a rib 120b is provided in the center of the second splice plate 117. According to the configuration shown in Fig. 13, the number of ribs 120 provided on the first splice plate 107 can be increased, thereby further increasing the strength of the joint 100.

The joint structure of the steel pipe pole according to this embodiment is the same as that of the second embodiment, except for the shape of the rib, and can achieve the same effects.

[Fourth embodiment]
This embodiment shows an example in which the flange configuration is different from that of the joint structure for a steel pipe pole shown in the first embodiment. In the following description, the differences from the first embodiment will be mainly described.

(1) First Configuration Figures 14(A) and (B) show a joint structure for a steel pipe pole according to a first configuration of this embodiment. In Figure 14, (A) shows a developed view of the joint structure for a steel pipe pole, and (B) shows a perspective view thereof. Figure 15 shows a cross-sectional schematic view of the joint structure for a steel pipe pole. In the first configuration of this embodiment, the first flange 104 is formed of a member continuous from the first steel pipe pole 102, and the second flange 114 is formed of a member continuous from the second steel pipe pole 112. Note that fastening members such as bolts and nuts are omitted from Figure 14(A).

As shown in Figures 14(A) and (B), a first flange 104 is provided at one end (lower end) of the first steel pipe pole 102, and a second flange 114 is provided at one end (upper end) of the second steel pipe pole 112. The first flange 104 is continuous with the first steel pipe pole 102 and has the same thickness, and the second flange 114 is continuous with the second steel pipe pole 112 and has the same thickness. The first flange 104 is provided corresponding to each face of the first steel pipe pole 102, and the second flange 114 is provided corresponding to each face of the second steel pipe pole 112.

The first flange 104 and the second flange 114 may be formed by notching the corners of the respective steel pipe columns. Figures 14(A) and (B) show a configuration in which the first notch 109 and the second notch 119 are formed by notching the corners of the first steel pipe column 102 and the second steel pipe column 112, which have a square cross-sectional shape, thereby forming the first flange 104 and the second flange 114.

The first steel pipe column 102 and the second steel pipe column 112 are joined using the first splice plates 105 (105a, 105b) and second splice plates 115 (115a, 115b) with L-shaped cross sections as shown in the first embodiment. The first splice plates 105 (105a, 105b) abut against the outside of the first flange 104 and the second flange 114, and the second splice plates 115 (115a, 115b) abut against the inside of the first flange 104 and the second flange 114.

In the steel pipe column joint structures shown in Figures 14(A) and (B) and Figure 15, the provision of ribs 120 on the first support plate 105 and the second support plate 115 prevents the joint 100 from buckling when a load is applied to the steel pipe column.

Figure 15 shows the structure of the first steel pipe column 102 side as a cross-sectional schematic of the joint 100. Joints 100a, 100b, 100c, and 100d are formed on each side of the first steel pipe column 102 by first splice plates 105 (105a, 105b) and second splice plates 115 (115a, 115b). The first flanges 104 are separated from adjacent first flanges by first notches 109. Although not shown, the second steel pipe column 112 has a similar structure. With this configuration, an opening 122 is formed in the joint 100, as shown in Figures 15 and 14(B). The opening 122 eliminates the boundary between the interior and exterior spaces of the first steel pipe column 102 and the second steel pipe column 112, providing a region connecting the interior and exterior spaces of the joint 100.

In the first configuration of this embodiment, openings 122 are also formed to correspond to the corners of the steel pipe column, making it easy to perform bolt joint construction. Because openings 122 are formed to correspond to each corner of the steel pipe column, bolt joint construction can be easily performed even if the first support plates 105a, 105b and second support plates 115a, 115b are divided into left and right halves in the material axis direction.

Figures 16(A) and (B) show development views of a joint structure for a steel pipe column according to the first configuration of this embodiment. Also, Figures 17(A) and (B) show a cross-sectional schematic structure of the joint portion of this joint structure. Note that fastening members such as bolts and nuts are omitted from Figures 16(A) and (B).

Figure 16(A) shows an exploded view in which the rib 120 is provided on the first splice plate 105 and the second splice plate 115 is flat, and Figure 17(A) shows a schematic cross-sectional structure of the joint 100. By providing the rib 120 on at least the first splice plate 105 (105a, 105b), buckling of the joint 100 can be prevented when a load is applied to the steel pipe column.

Figure 16(B) shows an exploded view in which ribs 120 are provided on the second support plate 115 (115a, 115b) and the first support plate 105 is flat, and Figure 17(B) shows a schematic cross-sectional structure of the joint 100. By not providing ribs on the first support plate 105, a structure can be created in which the ribs do not protrude from the column, which does not affect the appearance or design.

The steel pipe pole joint structure shown in Figures 14 to 17 is the same as that of the first embodiment, except for the configurations of the first steel pipe pole 102 and first flange 104, and the second steel pipe pole 112 and second flange 114, and can achieve the same effects.

(2) Second Configuration Figures 18(A) and (B) show a joint structure for a steel pipe pole according to a second configuration of this embodiment. In Figure 18, (A) shows a developed view of the joint structure for a steel pipe pole, and (B) shows a perspective view thereof. Figure 19 shows a schematic cross-sectional view of the joint structure for a steel pipe pole. In the second configuration of this embodiment, the first splice plate 106 and the second splice plate 116 have the same configuration as in the second embodiment. A first flange 104 is formed in the first steel pipe pole 102 by a first notch 109, and a second flange 114 is formed in the second steel pipe pole 112 by a second notch 119. Note that fastening members such as bolts and nuts are omitted from Figure 18(A).

As shown in FIG. 18(A), the first and second splice plates 106 and 116 are provided with ribs 120a and 120b running vertically through their centers. As shown in FIG. 19, the first and second splice plates 106 and 116 sandwich the first and second flanges 104 and 114 to form the joint 100. As shown in FIG. 19, the ribs 120a and 120b abut against the first and second splice plates 106 and 116 and are welded at welds 124a and 124b (note that the welds of the ribs 120a and 120b are omitted in FIGS. 18(A) and 18(B)). As shown in FIGS. 18(B) and 19, even when the joint 100 has an opening 122 and the first and second splice plates 106 and 116 are provided with ribs 120a and 120b, bolt construction can be easily performed.

The steel pipe pole joint structures shown in Figures 18(A) and (B) and Figure 19 are the same as those in the second embodiment, except for the configurations of the first steel pipe pole 102 and first flange 104, and the second steel pipe pole 112 and second flange 114, and can achieve the same effects.

Figures 20(A) and (B) show development views of a joint structure for a steel pipe column according to the second configuration of this embodiment. Also, Figures 21(A) and (B) show a cross-sectional schematic structure of the joint portion of this joint structure. Note that fastening members such as bolts and nuts are omitted from Figures 20(A) and (B). Also, welded portions are omitted from Figures 20(A) and (B).

Figure 20(A) shows a case where ribs 120a are provided on the first support plate 106 and the second support plate 116 is flat and has no ribs, and Figure 21(A) shows a schematic cross-sectional structure of the joint 100. Figure 20(B) shows a case where ribs 120b are provided on the second support plate 116 and the first support plate 106 is flat and has no ribs, and Figure 21(B) shows a schematic cross-sectional structure of the joint 100. Even in a structure where ribs are provided on only one of the first support plate 106 and the second support plate 116, the ribs are included in the joint 100, which increases the strength of the joint 100 and prevents buckling.

The steel pipe pole joint structures shown in Figures 18(A) and (B) and Figures 21(A) and (B) are the same as those in the second embodiment, except for the configuration of the first flange 104 provided on the first steel pipe pole 102 and the second flange 114 provided on the second steel pipe pole 112, and can achieve the same effects.

In the second configuration of this embodiment, an example is shown in which the ribs 120a and 120b are arranged in a direction parallel to the material axis direction, but the arrangement of the ribs 120 is not limited to this, and they may be arranged diagonally from one end of the support plate to the other diagonal end.

(3) Third Configuration Figures 22(A) and (B) show a joint structure for a steel pipe pole according to a third configuration of this embodiment. In Figure 22, (A) shows a developed view of the joint structure for a steel pipe pole, and (B) shows a perspective view thereof. Figure 23 shows a cross-sectional schematic view of the joint structure for a steel pipe pole. In the third configuration of this embodiment, the first splice plate 107 and the second splice plate 117 have the same configuration as in the third embodiment. Note that fastening members such as bolts and nuts are omitted in Figure 22(A).

As shown in Figure 22 (A), the first support plate 107, which is located on the outside of the first flange 104 and the second flange 114, has multiple ribs 120c, while the second support plate 117, which is located on the inside, has no ribs. The first steel pipe column 102 has a first flange 104 formed by a first cutout 109, and the second steel pipe column 112 has a second flange 114 formed by a second cutout 119.

As shown in Figure 22(A), the first splice plate 107 has ribs 120c on both the left and right sides. As shown in Figure 23, the first flange 104 and the second flange 114 are sandwiched between the first splice plate 107 and the second splice plate 117 to form the joint 100. The ribs 120c are welded to the first splice plate 107 to form welds 124c. As shown in Figures 22(B) and 23, the joint 100 has an opening 122, and even if the first splice plate 107 has ribs 120c, bolt joint construction can be easily performed. The first splice plate 107 may have ribs 120c provided from the beginning, or the ribs 120c may be welded after the bolt joint is formed.

The steel pipe pole joint structures shown in Figures 22(A) and (B) and Figure 23 are similar to those of the third embodiment, except for the configurations of the first steel pipe pole 102 and first flange 104, and the second steel pipe pole 112 and second flange 114. They can also be combined with Variation 2, achieving similar effects.

Fifth Embodiment
This embodiment shows an example in which a diaphragm is provided in the steel pipe pole in the joint structure of the steel pipe pole shown in the first embodiment. In the following explanation, the differences from the first embodiment will be mainly described.

(1) First configuration

Figures 24(A) and (B) show the joint structure of a steel pipe pole according to the first configuration of this embodiment. In Figure 24, (A) shows an exploded view of the joint structure of a steel pipe pole, and (B) shows a perspective view thereof. Figure 25 shows a schematic cross-sectional view of the joint structure of a steel pipe pole. Note that fastening members such as bolts and nuts are omitted from Figure 24(A).

In the first configuration of this embodiment, a first diaphragm 103 is provided at the end of the first steel pipe column 102, and a second diaphragm 113 is provided at the end of the second steel pipe column 112. The first diaphragm 103 is provided to close the open end of the first steel pipe column 102, and the second diaphragm 113 is provided to close the open end of the second steel pipe column 112. The first diaphragm 103 and the second diaphragm 113 are formed from the same steel material as the steel pipe columns. The first diaphragm 103 and the second diaphragm 113 are joined to the first steel pipe column 102 and the second steel pipe column 112, respectively, by, for example, welding.

The first flange 104 is provided so as to stand within the surface of the first diaphragm 103. The first flange 104 is provided so as to correspond to each surface of the first steel pipe column 102 within the surface of the first diaphragm 103. The first flange 104 is welded to the first diaphragm 103. The second flange 114 is similarly provided on the second diaphragm 113.

Note that Figure 24(A) shows an example in which the first diaphragm 103 and the second diaphragm 113 are arranged to form four surfaces, but they are not limited to the arrangement shown in the figure and various other arrangements are possible. For example, the first diaphragm 103 and the second diaphragm 113 can be arranged to form a triangle, pentagon, or hexagon in a plan view.

By providing a flange via a diaphragm, the degree of freedom in the strength design of the joint 100 can be increased. In other words, the flange can be provided at the joint without being restricted by the diameter and thickness of the steel pipe column. For example, the plate thickness of the flange can be made larger than the wall thickness of the steel pipe column. In addition, the flange can be positioned freely within the plane of the diaphragm without being restricted by the diameter of the steel pipe column.

As shown in Figures 24(A) and 25, the first flange 104 is provided in a position that does not overlap the corner of the first steel pipe column 102, and the second flange 114 is provided so as not to overlap the corner of the second steel pipe column 112. This flange arrangement allows an opening 122 to be formed in the joint portion when the first steel pipe column 102 and the second steel pipe column 112 are joined. Figure 24(B) shows an aspect in which an opening 122 is formed in the joint portion 100 when the first steel pipe column 102 and the second steel pipe column 112 are joined.

The joint 100 uses the first support plates 105 (105a, 105b) and second support plates 115 (115a, 115b) shown in the first embodiment. The first support plates 105 (105a, 105b) abut against the outside of the first flange 104 and the second flange 114, and the second support plates 115 (115a, 115b) abut against the inside of the first flange 104 and the second flange 114.

In this embodiment, the strength of the joint 100 can be increased by providing ribs 120 on the first support plate 105 (105a, 105b) and the second support plate 115 (115a, 115b). For example, buckling of the joint 100 can be prevented when a buckling load acts on a steel pipe column.

Figure 25 shows a cross-sectional schematic structure of the joint 100, looking at the first steel pipe column 102 side. Joints 100a, 100b, 100c, and 100d are formed on each side of the first steel pipe column 102 by first splice plates 105 (105a, 105b) and second splice plates 115 (115a, 115b). The first flanges 104 are formed spaced apart from adjacent first flanges. Although not shown, the second steel pipe column 112 has a similar structure. With this configuration, an opening 122 is formed in the joint portion, as shown in Figures 24(B) and 25.

In this embodiment, openings 122 are formed corresponding to the corners of the steel pipe column, making it easy to perform bolt joint construction. Because openings 122 are formed corresponding to each corner of the steel pipe column, bolt joint construction can be easily performed even if the first support plates 105a, 105b and second support plates 115a, 115b are divided into left and right halves in the material axis direction.

In the steel pipe column joint structures shown in Figures 24(A) and (B) and Figure 25, the first support plate 105 (105a, 105b) and the second support plate 115 (115a, 115b) have ribs 120, which increases the strength of the joint 100 and prevents the joint 100 from buckling when a load is applied to the steel pipe column.

Figures 26(A) and (B) show development views of a joint structure for a steel pipe column according to the first configuration of this embodiment. Also, Figures 27(A) and (B) show a cross-sectional schematic structure of the joint portion of this joint structure. Note that fastening members such as bolts and nuts are omitted from Figures 27(A) and (B).

Figure 26(A) shows a development in which a rib 120 is provided on the first splice plate 105 and the second splice plate 115 is flat, and Figure 27(A) shows a schematic cross-sectional structure of the joint 100. Figure 26(B) shows a development in which a rib 120 is provided on the second splice plate 115 (115a, 115b) and the first splice plate 105 is flat, and Figure 27(B) shows a schematic cross-sectional structure of the joint 100. By providing a rib 120 on either the first splice plate 105 (105a, 105b) or the second splice plate 115 (115a, 115b), buckling of the joint 100 can be prevented when a load is applied to the steel pipe column.

The joint structure of the steel pipe column according to the first configuration of this embodiment is the same as that of the first embodiment, except that the first diaphragm 103 and the second diaphragm 113 are provided, and similar effects can be obtained.

(2) Second Configuration Figures 28(A) and (B) show a joint structure for a steel pipe pole according to a second configuration of this embodiment. In Figure 28, (A) shows a developed view of the joint structure for a steel pipe pole, and (B) shows a perspective view thereof. Figure 29 shows a cross-sectional schematic view of the joint structure for a steel pipe pole. In the second configuration of this embodiment, the first flange 104 is joined to the first diaphragm 103, the second flange 114 is joined to the second diaphragm 113, and the first splice plate 106 and the second splice plate 116 have the same configuration as in the second embodiment. Note that fastening members such as bolts and nuts are omitted in Figure 28(A).

Figures 30(A) and (B) show development views of a joint structure for a steel pipe column according to the second configuration of this embodiment. Also, Figures 31(A) and (B) show a cross-sectional schematic structure of the joint portion of this joint structure. Note that fastening members such as bolts and nuts are omitted from Figures 30(A) and (B).

Figures 30(A) and 31(B) show a case where ribs 120a are provided on the first support plate 106, and the second support plate 116 is flat and has no ribs. Figures 30(B) and 31(B) show a case where ribs 120b are provided on the second support plate 116, and the first support plate 106 is flat and has no ribs. Even in a structure where ribs are provided on only one of the first support plate 106 and the second support plate 116, the ribs are included in the joint 100, which increases the strength of the joint 100 and prevents buckling.

The second configuration of this embodiment is the same as the second embodiment except that a diaphragm is provided on the steel pipe column, and similar effects can be obtained.

In the second configuration of this embodiment, an example is shown in which the ribs 120a and 120b are arranged in a direction parallel to the material axis direction, but the arrangement of the ribs 120 is not limited to this, and they may be arranged diagonally from one end of the support plate to the other diagonal end.

(3) Third Configuration Figures 32(A) and (B) show a joint structure for a steel pipe pole according to a third configuration of this embodiment. In Figure 32, (A) shows a developed view of the joint structure for a steel pipe pole, and (B) shows a perspective view thereof. Figure 33 shows a cross-sectional schematic view of the joint structure for a steel pipe pole. In the third configuration of this embodiment, the first flange 104 is joined to the first diaphragm 103, the second flange 114 is joined to the second diaphragm 113, and the first splice plate 107 and the second splice plate 117 have the same configuration as in the third embodiment. Note that fastening members such as bolts and nuts are omitted in Figure 32(A).

As shown in Figure 32(A), the first splice plate 107 is provided with a rib 120c, while the second splice plate 117 is not provided with a rib. The ribs 120c provided on the first splice plate 107 extend along the material axis direction and are provided on both the left and right sides. As shown in Figure 33, the first flange 104 and the second flange 114 are sandwiched between the first splice plate 107 and the second splice plate 117 to form the joint 100. The rib 120c is welded to the first splice plate 107 to form a weld 124c. As shown in Figures 33 and 32(B), an opening 122 is formed in the joint portion, making it easy to perform bolt joint construction even when the rib 120c is provided on the first splice plate 107.

The third configuration of this embodiment is the same as the third embodiment except that a diaphragm is provided on the steel pipe column. It can also be combined with variant 2 to achieve the same effects.

Sixth Embodiment
This embodiment shows an example of the case where the column diameters of the first steel pipe column 102 and the second steel pipe column 112 are different in the joint structure of the steel pipe columns shown in the fifth embodiment. The following explanation will focus on the parts that differ from the fifth embodiment.

(1) First Configuration Figures 34(A) and (B) show a joint structure of a steel pipe pole according to the first configuration of this embodiment. In Figure 34, (A) shows a developed view of the joint structure of a steel pipe pole, and (B) shows a perspective view thereof. Figure 35 shows a cross-sectional schematic view of the joint structure of a steel pipe pole. Note that fastening members such as bolts and nuts are omitted in Figure 34(A).

In this embodiment, the second steel pipe pole 112 has a larger pole diameter (poll thickness) than the first steel pipe pole 102. In other words, the second steel pipe pole 112 (112) arranged below has a larger pole diameter than the first steel pipe pole 102 arranged above. The steel pipe pole joint structure according to the first configuration of this embodiment has a structure in which steel pipe poles of different pole diameters (different thicknesses) are joined together.

As shown in Figure 34 (A), a first diaphragm 103 is provided on a first steel pipe column 102, and a second diaphragm 113 is provided on a second steel pipe column 112. The first diaphragm 103 is welded to close one end (lower end) of the first steel pipe column 102, and the second diaphragm 113 is welded to close one end (upper end) of the second steel pipe column 112.

Since the first steel pipe column 102 and the second steel pipe column 112 have different column diameters (thickness), the areas of the first diaphragm 103 and the second diaphragm 113 in a plan view may differ accordingly. The diaphragms need only be large enough to cover the end faces of the steel pipe columns, and the size of the second diaphragm 113 in a plan view may be larger than that of the first diaphragm 103. Furthermore, it is preferable that the second diaphragm 113, which is positioned below, be thicker than the first diaphragm 103 in order to increase rigidity and strength.

The first flange 104 is provided so as to stand within the surface of the first diaphragm 103. The first flange 104 is provided so as to correspond to each surface of the first steel pipe column 102 within the surface of the first diaphragm 103. The first flange 104 is welded to the first diaphragm 103. The second flange 114 is similarly provided on the second diaphragm 113. This allows an opening 122 to be formed in the joint portion when the first steel pipe column 102 and the second steel pipe column 112 are joined. Figure 34 (B) shows an aspect in which an opening 122 is formed in the joint portion 100 when the first steel pipe column 102 and the second steel pipe column 112 are joined.

The joint 100 uses the first support plates 105 (105a, 105b) and second support plates 115 (115a, 115b) shown in the first embodiment. The first support plates 105 (105a, 105b) abut against the outside of the first flange 104 and the second flange 114, and the second support plates 115 (115a, 115b) abut against the inside of the first flange 104 and the second flange 114.

In this embodiment, the strength of the joint 100 can be increased by providing ribs 120 on the first support plate 105 (105a, 105b) and the second support plate 115 (115a, 115b). For example, buckling of the joint 100 can be prevented when a buckling load acts on a steel pipe column.

Figure 35(A) shows a cross-sectional schematic view of the joint 100 looking toward the second steel pipe column 112, and Figure 35(B) shows a cross-sectional schematic view of the joint 100 looking toward the first steel pipe column 102. Joints 100a, 100b, 100c, and 100d are formed on each side of the first steel pipe column 102 by first splice plates 105 (105a, 105b) and second splice plates 115 (115a, 115b). The first flanges 104 are formed spaced apart from adjacent first flanges. Although not shown, the second steel pipe column 112 has a similar structure. With this configuration, an opening 122 is formed in the joint portion, as shown in Figures 34(B) and 35.

In this embodiment, openings 122 are formed corresponding to the corners of the steel pipe column, making it easy to perform bolt joint construction. Because openings 122 are formed corresponding to each corner of the steel pipe column, bolt joint construction can be easily performed even if the first support plates 105a, 105b and second support plates 115a, 115b are divided into left and right halves in the material axis direction.

In the steel pipe column joint structures shown in Figures 34(A) and (B) and Figure 35, the first support plate 105 (105a, 105b) and the second support plate 115 (115a, 115b) have ribs 120, which increases the strength of the joint 100 and prevents the joint 100 from buckling when a load is applied to the steel pipe column.

Furthermore, by providing a diaphragm at the end of the steel pipe pole, steel pipe poles of different thicknesses can be joined. In addition, the thickness of the flange can be made larger relative to the thickness of the steel pipe pole, increasing the strength of the joint.

Figures 36(A) and (B) show development views of a joint structure for a steel pipe column according to the first configuration of this embodiment. Figures 37(A) and (B) and Figures 38(A) and (B) show cross-sectional schematic structures of the joint portion of this joint structure. Note that fastening members such as bolts and nuts are omitted from Figures 37(A) and (B).

Figure 36(A) shows an expanded view when the rib 120 is provided on the first splice plate 105 and the second splice plate 115 is flat, Figure 37(A) shows a schematic cross-sectional structure of the joint 100 looking toward the second steel pipe column 112, and Figure 37(B) shows a schematic cross-sectional structure of the joint 100 looking toward the first steel pipe column 102. Figure 36(B) shows an expanded view when the rib 120 is provided on the second splice plate 115 (115a, 115b) and the first splice plate 105 is flat, Figure 38(A) shows a schematic cross-sectional structure of the joint 100 looking toward the second steel pipe column 112, and Figure 38(B) shows a schematic cross-sectional structure of the joint 100 looking toward the first steel pipe column 102. By providing a rib 120 on one of the first splice plates 105 (105a, 105b) and the second splice plates 115 (115a, 115b), buckling of the joint 100 can be prevented when a load is applied to the steel pipe column.

The joint structure of the steel pipe pole in the first configuration of this embodiment is similar to the first configuration of the fifth embodiment, except for the differences in the pole diameters of the first steel pipe pole 102 and the second steel pipe pole 112 and the configurations of the first diaphragm 103 and the second diaphragm 113, and can achieve the same effects.

(2) Second Configuration Figures 39(A) and (B) show a joint structure for a steel pipe pole according to a second configuration of this embodiment. In Figure 39, (A) shows a developed view of the joint structure for a steel pipe pole, and (B) shows a perspective view thereof. Figure 40 shows a cross-sectional schematic view of the joint structure for a steel pipe pole. In the second configuration of this embodiment, the first flange 104 is joined to the first diaphragm 103, the second flange 114 is joined to the second diaphragm 113, and the first splice plate 106 and the second splice plate 116 have the same configuration as in the second embodiment. Note that fastening members such as bolts and nuts are omitted in Figure 39(A).

Figure 41(A) shows an expanded view when the rib 120a is provided on the first splice plate 105 and the second splice plate 116 is flat, Figure 42(A) shows a schematic cross-sectional structure of the joint 100 looking toward the second steel pipe column 112, and Figure 42(B) shows a schematic cross-sectional structure of the joint 100 looking toward the first steel pipe column 102. Figure 41(B) shows an expanded view when the rib 120b is provided on the second splice plate 116 and the first splice plate 106 is flat, Figure 43(A) shows a schematic cross-sectional structure of the joint 100 looking toward the second steel pipe column 112, and Figure 43(B) shows a schematic cross-sectional structure of the joint 100 looking toward the first steel pipe column 102. Note that fastening members such as bolts and nuts are omitted from Figures 41(A) and (B).

Figures 41(A), 41-1(A), and (B) show a case where ribs 120a are provided on the first support plate 106, and the second support plate 116 is flat and has no ribs. Figures 30(B) and 43(A) and (B) show a case where ribs 120b are provided on the second support plate 116, and the first support plate 106 is flat and has no ribs. Even in a structure where ribs are provided on only one of the first support plate 106 and the second support plate 116, the ribs are included in the joint 100, which increases the strength of the joint 100 and prevents buckling.

The joint structure of the steel pipe pole in the second configuration of this embodiment is similar to the second configuration of the fifth embodiment, except for the differences in the pole diameters of the first steel pipe pole 102 and the second steel pipe pole 112 and the configurations of the first diaphragm 103 and the second diaphragm 113, and can achieve the same effects.

In the second configuration of this embodiment, an example is shown in which the ribs 120a and 120b are arranged in a direction parallel to the material axis direction, but the arrangement of the ribs 120 is not limited to this, and they may be arranged diagonally from one end of the support plate to the other diagonal end.

(3) Third Configuration Figures 44(A) and (B) show a joint structure for a steel pipe pole according to a third configuration of this embodiment. In Figure 44, (A) shows a developed view of the joint structure for a steel pipe pole, and (B) shows a perspective view thereof. Figure 45 shows a cross-sectional schematic view of the joint structure for a steel pipe pole. In the third configuration of this embodiment, the first flange 104 is joined to the first diaphragm 103, the second flange 114 is joined to the second diaphragm 113, and the first splice plate 107 and the second splice plate 117 have the same configuration as in the third embodiment. Note that fastening members such as bolts and nuts are omitted in Figure 44(A).

As shown in Figure 44(A), the first splice plate 107 is provided with a rib 120c, while the second splice plate 117 is not provided with a rib. The ribs 120c provided on the first splice plate 107 extend along the material axis direction and are provided on both the left and right sides. As shown in Figure 45, the first flange 104 and the second flange 114 are sandwiched between the first splice plate 107 and the second splice plate 117 to form the joint 100. The rib 120c is welded to the first splice plate 107 to form a weld 124c. As shown in Figures 45 and 44(B), an opening 122 is formed in the joint portion, making it easy to perform bolt joint construction even when the rib 120c is provided on the first splice plate 107.

The third configuration of this embodiment is similar to the second configuration of the fifth embodiment, except that the column diameters of the first steel pipe column 102 and the second steel pipe column 112 and the configurations of the first diaphragm 103 and the second diaphragm 113 are different, and similar effects can be obtained.

100... Joint, 102... First steel pipe column, 103... First diaphragm, 104... First flange, 105... First splice plate, 106... First splice plate, 107... First splice plate, 108... First auxiliary plate, 109... First notch, 112... Second steel pipe column, 113... Second diaphragm, 114... Second flange, 115... Second splice plate, 116... Second splice plate, 117... Second splice plate, 118... Second auxiliary plate, 119... Second notch, 120... Rib, 122... Opening, 124... Weld, 130... Weld, 132... Backing plate

Claims (10)

A first flange provided at one end of the first steel pipe column;
A second flange provided at one end of the second steel pipe column;
a splice plate in contact with an outer plate surface of the first flange and an outer plate surface of the second flange;
a first auxiliary plate joined to an outer surface of the first steel pipe column and adjacent to the first flange;
a second auxiliary plate joined to the outer surface of the second steel pipe column and adjacent to the second flange;
Including,
The thickness of the first flange is thicker than the thickness of the first steel pipe pole, and the thickness of the second flange is thicker than the thickness of the second steel pipe pole,
The first flange extends in a direction away from the one end of the first steel pipe pole along the material axis direction of the first steel pipe pole, and an inner plate surface is provided flush with the inner surface of the first steel pipe pole and an outer plate surface is provided so as to protrude from the outer surface of the first steel pipe pole,
The second flange extends in a direction away from the one end of the second steel pipe pole along the material axis direction of the second steel pipe pole, and an inner plate surface is provided flush with the inner surface of the second steel pipe pole and an outer plate surface is provided so as to protrude from the outer surface of the second steel pipe pole,
The first auxiliary plate is joined to a portion of the first flange at an end portion on the first steel pipe pole side and protruding from an outer surface of the first steel pipe pole,
The second auxiliary plate is joined to a portion of the second flange at an end portion on the second steel pipe pole side and protruding from an outer surface of the second steel pipe pole,
The splice plate has a rib extending in the material axis direction of the first steel pipe pole and the second steel pipe pole,
a first flange and a second flange, the first flange and the second flange being bolted together with a tip thereof facing each other, and the second flange and the second flange being bolted together with a tip thereof facing each other; The steel pipe column joint structure described in claim 1, wherein the splice plate has an L-shaped cross section, a first portion that abuts the first flange and the second flange, and a second portion that bends from the first portion, and the second portion serves as the rib. The steel pipe column joint structure according to claim 2, wherein the splice plate comprises a plurality of splice plates arranged side by side so as to contact the same plate surface of the first flange and the same plate surface of the second flange. The steel pipe column joint structure according to claim 1, wherein the rib is provided at the center of the splice plate. The steel pipe column joint structure according to claim 1, wherein the ribs are provided on both sides of the splice plate. 6. The steel pipe column joint structure according to claim 1, further comprising a second support plate in contact with an inner plate surface of the first flange and an inner plate surface of the second flange, wherein the first flange, the support plate, and the second support plate are bolted together, and the second flange, the support plate, and the second support plate are bolted together. The first auxiliary plate has a plate thickness that is approximately the same as or greater than the height to which the first flange protrudes from the outer surface of the first steel pipe pole,
The steel pipe pole joint structure according to claim 1, wherein the second auxiliary plate has a plate thickness that is approximately the same as or greater than a height at which the second flange protrudes from the outer surface of the second steel pipe pole. A first flange provided at one end of the first steel pipe column;
A second flange provided at one end of the second steel pipe column;
a splice plate in contact with an outer plate surface of the first flange and an outer plate surface of the second flange;
a first auxiliary plate joined to the inner surface of the first steel pipe column and adjacent to the first flange;
a second auxiliary plate joined to the inner surface of the second steel pipe column and adjacent to the second flange;
Including,
The thickness of the first flange is thicker than the thickness of the first steel pipe pole, and the thickness of the second flange is thicker than the thickness of the second steel pipe pole,
The first flange extends in a direction away from the one end of the first steel pipe pole along the material axis direction of the first steel pipe pole, and an outer plate surface is provided flush with the outer surface of the first steel pipe pole and an inner plate surface is provided so as to protrude from the inner surface of the first steel pipe pole,
The second flange extends in a direction away from the one end of the second steel pipe pole along the material axis direction of the second steel pipe pole, and an outer plate surface is provided flush with the outer surface of the second steel pipe pole and an inner plate surface is provided so as to protrude from the inner surface of the second steel pipe pole,
The first auxiliary plate is joined to a portion of the first flange at an end portion on the first steel pipe pole side and protruding from the inner surface of the first steel pipe pole,
The second auxiliary plate is joined to a portion of the second flange at an end portion on the second steel pipe pole side and protruding from the inner surface of the second steel pipe pole,
The splice plate has a rib extending in the material axis direction of the first steel pipe pole and the second steel pipe pole,
a first flange and a second flange, the first flange and the second flange being bolted together with a tip thereof facing each other, and the second flange and the second flange being bolted together with a tip thereof facing each other; The first auxiliary plate has a plate thickness that is approximately the same as or greater than the height to which the first flange protrudes from the inner surface of the first steel pipe pole,
The steel pipe pole joint structure according to claim 8, wherein the second auxiliary plate has a plate thickness that is approximately the same as or greater than a height at which the second flange protrudes from the inner surface of the second steel pipe pole. The steel pipe pole joint structure according to any one of claims 1 to 9, wherein the first steel pipe pole and the second steel pipe pole are square steel pipe poles.