Steel pipe column joint structure

Abstract

To prevent reduction in strength of a bolt-joined part compared to other parts of a steel pipe column.SOLUTION: A joint structure of a steel pipe column includes: a first flange provided on one end of a first steel pipe column; a second flange provided on one end of a second steel pipe column; and a splice plate contacting the first flange and the second flange. The splice plate has a rib extending in a material axis direction of the first steel pipe column and the second steel pipe column, and the first steel pipe column and the second steel pipe column are bolt-joined to each other by using the first flange, the second flange and the splice plate.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] An embodiment of the present invention relates to a joint structure of a steel pipe column used in a building. [Background technology]

[0002] Welding and bolting are known methods for joining steel frame members. 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 being able to shorten construction time and facilitating quality control. Bolted joints are used to join various steel frame members; 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). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 5-179702 [Patent Document 2] Japanese Patent Application Laid-Open No. 2004-293196 Summary of the Invention [Problem to be solved by the invention]

[0004] When bolting steel frame members, it is easy to bolt members with an open cross-section, such as H-beams. However, when bolting tubular members, such as steel pipe columns, construction is not easy. Furthermore, it is required that the bolted parts do not lose strength compared to the rest of the steel pipe column.

[0005] One of the objects of the present invention is to provide a joint structure for a steel pipe column that solves these problems. [Means for solving the problem]

[0006] 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 a rib extending in the material axis 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. [Effects of the Invention]

[0007] According to the steel pipe column joint structure of one embodiment of the present invention, by providing a rib on the support plate that abuts the flange, it is possible to prevent the joint from buckling when a load is applied to the steel pipe column. [Brief explanation of the drawings]

[0008] [Figure 1] 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. [Figure 2] 1(B) is a front view of a joint structure of a steel pipe column according to one embodiment of the present invention. FIG. [Figure 3] 3 is a cross-sectional schematic view of the joint structure of a steel pipe pole according to one embodiment of the present invention, the joint structure being shown in FIG. 2. [Figure 4] 1A and 1B show a joint structure of a steel pipe pole according to one embodiment of the present invention, in which (A) and (B) are development views thereof. [Figure 5] 4(A) and 4(B) show a cross-sectional schematic structure of the joint structure of a steel pipe pole according to one embodiment of the present invention. [Figure 6] FIG. 1 shows a front view of a joint structure of a steel pipe column according to an embodiment of the present invention. [Figure 7] 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. [Figure 8] 8 shows a cross-sectional schematic structure of the joint structure of a steel pipe pole according to one embodiment of the present invention, the joint structure shown in FIG. 7. [Figure 9]1A and 1B show a joint structure of a steel pipe pole according to one embodiment of the present invention, in which (A) and (B) are development views thereof. [Figure 10] 9(A) and 9(B) are cross-sectional schematic views of the joint structure of a steel pipe pole according to one embodiment of the present invention. [Figure 11] 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. [Figure 12] 12 is a cross-sectional schematic view of the joint structure of a steel pipe pole according to one embodiment of the present invention, the joint structure being shown in FIG. 11. FIG. [Figure 13] FIG. 1 shows a development view of a joint structure of a steel pipe column according to one embodiment of the present invention. [Figure 14] 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. [Figure 15] 15 is a cross-sectional schematic view of the joint structure of a steel pipe pole according to one embodiment of the present invention, the joint structure being shown in FIG. 14. [Figure 16] 1A and 1B show a joint structure of a steel pipe pole according to one embodiment of the present invention, in which (A) and (B) are development views thereof. [Figure 17] 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. [Figure 18] 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. [Figure 19] 19 shows a cross-sectional schematic structure of the joint structure of a steel pipe pole according to one embodiment of the present invention, the joint structure shown in FIG. 18. [Figure 20] 1A and 1B show a joint structure of a steel pipe pole according to one embodiment of the present invention, in which (A) and (B) are development views thereof. [Figure 21] 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. [Figure 22] 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. [Figure 23] 23 is a cross-sectional schematic view of the joint structure of a steel pipe pole according to one embodiment of the present invention, the joint structure being shown in FIG. 22. [Figure 24] 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. [Figure 25] 25 is a cross-sectional schematic view of the joint structure of a steel pipe pole according to one embodiment of the present invention, the joint structure being shown in FIG. 24. [Figure 26] 1A and 1B show a joint structure of a steel pipe pole according to one embodiment of the present invention, in which (A) and (B) are development views thereof. [Figure 27] 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. [Figure 28] 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. [Figure 29] 29 shows a cross-sectional schematic structure of the joint structure of a steel pipe pole according to one embodiment of the present invention, the joint structure shown in FIG. 28. [Figure 30] 1A and 1B show a joint structure of a steel pipe pole according to one embodiment of the present invention, in which (A) and (B) are development views thereof. [Figure 31] 30(A) and 30(B) show a cross-sectional schematic structure of the joint structure of a steel pipe pole according to one embodiment of the present invention. [Figure 32] 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. [Figure 33] 33 is a cross-sectional schematic view of the joint structure of a steel pipe pole according to one embodiment of the present invention, the joint structure being shown in FIG. 32. [Figure 34] 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. [Figure 35] 35 shows a cross-sectional schematic structure of the joint structure of a steel pipe pole according to one embodiment of the present invention, the joint structure shown in FIG. 34. [Figure 36]1A and 1B show a joint structure of a steel pipe pole according to one embodiment of the present invention, in which (A) and (B) are development views thereof. [Figure 37] 36(A) and 36(B) show a cross-sectional schematic structure of the joint structure of a steel pipe pole according to one embodiment of the present invention. [Figure 38] 36(A) and 36(B) show a cross-sectional schematic structure of the joint structure of a steel pipe pole according to one embodiment of the present invention. [Figure 39] 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. [Figure 40] 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, the joint structure being shown in FIG. 34. [Figure 41] 1A and 1B show a joint structure of a steel pipe pole according to one embodiment of the present invention, in which (A) and (B) are development views thereof. [Figure 42] 41(A) and 41(B) are cross-sectional schematic views of the joint structure of a steel pipe pole according to one embodiment of the present invention. [Figure 43] 41(A) and 41(B) are cross-sectional schematic views of the joint structure of a steel pipe pole according to one embodiment of the present invention. [Figure 44] 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. [Figure 45] 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 joint structure being shown in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0009] The contents of embodiments of the present invention will be described below with reference to the drawings and the like. However, the present invention includes many different aspects and should not be construed as being limited to the contents of the embodiments exemplified below. For clarity of explanation, the drawings may show the width, thickness, shape, etc. of each part schematically compared to the actual aspect, but this is merely an example and does not limit the contents 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 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 each element and have no further meaning unless otherwise specified.

[0010] Each of the embodiments shown below shows a joint structure for a steel pipe column, 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.

[0011] [First embodiment] 1(A) and (B) show a joint structure for a steel pipe pole according to one embodiment of the present invention. In FIG. 1, (A) shows a developed view of the joint structure for a steel pipe pole, and (B) shows a perspective view thereof. The joint structure for a steel pipe pole 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).

[0012] 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 surface of the respective steel pipe poles. That is, four first flanges 104 are provided corresponding to the four surfaces of the first steel pipe pole 102, and four second flanges 114 are provided corresponding to the four surfaces of the second steel pipe pole 112.

[0013] 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 to be 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 arranged 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.

[0014] For example, the thicknesses of the first flange 104 and the second flange 114 are set to be 1.2 to 3 times, preferably 1.5 to 2 times, the thickness of the first steel pipe pole 102 and the second steel pipe pole 112. In this way, by making the thicknesses of the first flange 104 and the second flange 114 larger than the thicknesses of the first steel pipe pole 102 and the second steel pipe pole 112, the effective cross-sectional area of ​​the joint 100 can be increased, and thereby the strength of the joint 100 can be enhanced.

[0015] The length of the first flange 104 and the second flange 114 (the length in the axial direction of the steel pipe column) 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 column 102 and the second steel pipe column 112.

[0016] The first flange 104 is welded to one end (lower end) of the first steel pipe pole 102, and the second flange 114 is welded to one end (upper end) of the second steel pipe pole 112. The first steel pipe pole 102 and the second steel pipe pole 112 are joined using the first flange 104 and the second flange 114. Splices that abut against the first flange 104 and the second flange 114 are provided at the joint 100. FIG. 1(A) shows an example in which a first splice plate 105 is applied to the outer side of the first flange 104 and the second flange 114, and a second splice plate 115 is applied to the inner side.

[0017] 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 made of steel material. For example, these members are made of structural rolled steel material.

[0018] 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 divided first splice plates 105a, 105b and second splice plates 115a, 115b is provided with a rib 120. The rib 120 extends in the up-down 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.

[0019] 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 against the flange and a second portion that is bent and protrudes from the first portion, and the rib 120 is formed by the second portion.

[0020] In this embodiment, the length of the rib 120 (length in the material axis 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.

[0021] Each of the first support plates 105 (105a, 105b) and the second support plates 115 (115a, 115b) has a length (length in the material axis direction) that allows it 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 plates 105 (105a, 105b), and the second support plates 115 (115a, 115b). The first flange 104 and the second flange 114 are sandwiched between the first support plates 105 (105a, 105b) arranged on the outside and the second support plates 115 (115, 115b) arranged on the inside, and are bolted together. As a result, as shown in Figure 1(B), the joint structure of the steel pipe column has a joint 100 formed by a first flange 104, a second flange, a first support plate 105 (105a, 105b), and a second support plate 115 (115a, 115b).

[0022] 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 by 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.

[0023] 1A and 1B show an example in which the ribs 120 of the first splice plates 105a, 105b and the second splice plates 115a, 115b are disposed in the center of the flanges. Although not shown, the ribs 120 may be disposed on both sides of the flanges, or on the center and end portions.

[0024] A first auxiliary plate 108 is provided on the first steel pipe pole 102 adjacent to the first flange 104, and a second auxiliary plate 118 is provided on the second steel pipe pole 112 adjacent to the second flange 114. The first auxiliary plate 108 and the second auxiliary plate 118 are formed of a steel material and are welded to the first steel pipe pole 102 and the second steel pipe pole 112, respectively. As shown in FIG. 1(B) , in a state in which the first steel pipe pole 102 and the second steel pipe pole 112 are 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 axial direction, and a first splice plate 105 (a second splice plate 115 is provided on the back surface side) is provided so as to abut against the first flange 104 and the second flange 114.

[0025] 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 the same thickness as 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.

[0026] FIG. 2 shows a front view of the joint structure of the steel pipe poles shown in FIG. 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 arranged so that its back side surface is flush with the inner surface of the first steel pipe pole 102, and the second flange 114 is arranged so that its back side surface 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 at the welded portion 130a from the inside of the steel pipe pole. The welded portion 130a is formed at the boundary portion between the first flange 104 and the first steel pipe pole 102 and the boundary portion 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.

[0027] The first auxiliary plate 108 is welded to the column surface of the first steel pipe pole 102, and the second auxiliary plate 118 is welded to the column surface of the second steel pipe pole 112. Welding portion 130b is provided along the outer periphery of the first auxiliary plate 108 and the second auxiliary plate 118. Moreover, the first auxiliary plate 108 is welded to the first flange 104 and the first steel pipe pole 102 at the welding portion 130a, and the second auxiliary plate 118 is welded to the second flange 114 and the second steel pipe pole 112 at the welding portion 130a.

[0028] By welding the first auxiliary plate 108 to the first steel pipe pole 102 adjacent to the first flange 104 and welding the second auxiliary plate 118 to the second steel pipe pole 112 adjacent to the second flange 114, the thickness of the portion adjacent to the joint between the first steel pipe pole 102 and the second steel pipe pole 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 pole, thereby increasing the strength of the joint 100. Furthermore, in this embodiment, by providing the first splice plate 105 and the second splice plate 115 with ribs 120, it is possible to prevent the joint 100 from buckling when a load is applied to the steel pipe pole.

[0029] 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 approximately the same dimensions as the length and width of the first flange 104 and the second flange 114.

[0030] Figure 3 shows a schematic cross-sectional structure between A1 and B1 shown in Figure 2, and shows 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 joint 100a, joint 100b, joint 100c, and joint 100d in a clockwise direction.

[0031] The joint 100a is formed by a first flange 104, and a first splice plate 105 (105a, 105b) and a second splice plate 115 (115a, 115b) that sandwich the first flange 104. The rib 120a of the first splice plate 105 (105a, 105b) is provided so as to protrude outward from the first steel pipe column 102, and the rib 120b of the second splice plate 115 (115a, 115b) is provided so as to protrude inward from the first steel pipe column 102. This structure is also the same for the joints 100b, 100c, and 100d.

[0032] The joint 100a is provided spaced apart from the adjacent joint 100b and joint 100d. In other words, the joints 100a, 100b, 100c, and 100d formed on each face of the first steel pipe pole 102 are provided spaced apart from the adjacent joints. By arranging the joints in this way, openings 122 are formed at the corners of the first steel pipe pole 102. The openings 122 become areas that connect the space inside the joint 100 with the outside. Although not shown, a similar structure is formed on the side of the second steel pipe pole 112.

[0033] The joint structure for a steel pipe pole according to this embodiment has openings 122 corresponding to the corners of the steel pipe pole, which makes it easy to perform bolted joint construction. As shown in FIG. 3, if a rib 120b protrudes on the inside of the first steel pipe pole 102, the rib 120b may become an obstacle, making it difficult to perform bolted joint construction. However, the formation of the openings 122 makes it easy to perform bolted joint construction. That is, a worker can insert a bolt into a bolt hole from the inside using the openings 122 and easily perform bolted joint construction work using a tool.

[0034] 1(B), the height of the opening 122 can be set to be approximately the same as the total length of the first flange 104 (the length in the material axis 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 a worker to insert bolts, tools, etc. inside the steel pipe pole and work therewith.

[0035] Figures 4(A) and (B) show development views of the joint structure of a steel pipe pole according to this embodiment, and Figures 5(A) and (B) show cross-sectional schematic structures of the joint portion of the joint structure.

[0036] Fig. 4(A) shows a development view in which ribs 120 are provided on the first support plate 105 (105a, 105b) and the second support plate 115 is flat, and Fig. 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.

[0037] Fig. 4(B) shows a development view in which ribs 120 are provided on the second support plate 115 (115a, 115b) and the first support plate 105 is flat, and Fig. 5(B) shows a cross-sectional schematic structure of the joint 100. In this example, no ribs are provided on the first support plate 105, so a structure can be achieved in which the ribs do not protrude from the column, and this does not affect the appearance or design.

[0038] In the steel pipe pole joint structure according to this embodiment, the strength of the joint portion 100 of the steel pipe poles can be increased by providing the rib 120 on one or both of the first splice plate 105 and the second splice plate 115. That is, the provision of the rib 120 can prevent the joint portion 100 from buckling when a load is applied to the steel pipe pole. Furthermore, the strength of the joint portion 100 is also increased by the thicknesses of the first flange 104 and the second flange 114 being greater than the thicknesses of the first steel pipe pole 102 and the second steel pipe pole 112.

[0039] Furthermore, in the steel pipe pole joint structure according to the present embodiment, a first auxiliary plate 108 is provided welded to the first steel pipe pole 102 so as to abut against the upper end of the first flange 104, and a second auxiliary plate 118 is provided welded to the second steel pipe pole 112 so as to abut against the lower end of the second flange 114, thereby making it possible to distribute 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 the first auxiliary plate 108 and the second auxiliary plate 118. This makes it possible to prevent 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, and thereby makes it possible to increase the strength of the joint 100.

[0040] [Variation 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.

[0041] The first splice plate 105 and the second splice plate 115 have the same configuration. Even if the attachment positions of the first flange 104 and the second flange 114 are changed in this way, the first steel pipe pole 102 and the second steel pipe pole 112 can be joined using the first splice plate 105 and the second splice plate 115.

[0042] [Second embodiment] This embodiment shows an example in which the structure of the splice plate is different from that of the joint structure of a steel pipe pole shown in Embodiment 1. In the following explanation, the differences from Embodiment 1 will be mainly described.

[0043] Figures 7(A) and (B) show a joint structure for a steel pipe pole according to this embodiment. In Figure 7, (A) shows a developed view of the joint structure for a steel pipe pole, and (B) shows a perspective view thereof. Figure 8 shows a schematic cross-sectional view of the joint structure for 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).

[0044] 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 pole 102 and the second steel pipe pole 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 against the first splice plate 106, and a weld 124b is formed where the rib 120b abuts against the first splice plate 106 (note that the welds of the ribs 120a, 120b are omitted in FIGS. 7(A) and 7(B)). The strength of the joint 100 can be increased by welding the ribs 120a, 120b to the first support plate 106 and the second support plate 116. For example, buckling of the joint 100 can be prevented when a load is applied to the steel pipe column.

[0045] By using separate members (rod-shaped members or plate-shaped members) to form the ribs 120a, 120b and welding them to the plate-shaped member, it is possible to appropriately select the width and thickness of the ribs 120a, 120b provided on the splice plate. This makes it possible to design the size of the ribs 120a, 120b according to the strength required for the joint 100. For example, by increasing the width and height of the ribs 120a, 120b, it is possible to increase the buckling load (the load at which the joint buckles), thereby increasing the strength of the steel pipe column.

[0046] As shown in Figures 7(B) and 8, an opening 122 is formed in the joint 100. By providing the opening 122, it is possible to easily perform the bolt joint construction even if the first splice plate 106 and the second splice plate 116 are provided with ribs 120a, 120b. Note that with respect to the first splice plate 106 arranged 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 joint is formed.

[0047] 9(A) and (B) show development views of the joint structure of a steel pipe pole according to this embodiment, and FIGS. 10(A) and (B) show cross-sectional schematic structures of the joining portion of the joint structure.

[0048] Fig. 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 Fig. 10(A) shows a schematic cross-sectional structure of the joint 100. By providing the ribs 120a on the first support plate 106, the strength of the joint 100 can be increased and buckling can be prevented.

[0049] FIG. 9(B) shows a case where the rib 120b is provided on the second support plate 116 and the first support plate 106 is flat and not provided with a rib, and FIG. 10(B) shows a schematic cross-sectional structure of the joint 100 in this case. In this example, since the first support plate 106 is not provided with a rib, a structure can be achieved in which the rib does not protrude from the column body, and the appearance and design are not affected. In this way, even in a structure in which a rib is provided on only one of the first support plate 106 and the second support plate 116, the buckling load (the load when the joint buckles) can be increased, and the strength of the steel pipe column can be increased.

[0050] In 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 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.

[0051] 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 obtain the same effects.

[0052] [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 explanation, the differences from the second embodiment will be mainly described.

[0053] Figures 11(A) and (B) show the joint structure of a steel pipe pole according to this embodiment. In Figure 11, (A) shows a developed 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).

[0054] As shown in FIG. 11(A), a plurality of ribs 120c are provided on the first splice plate 107 disposed on the outer side of the first flange 104 and the second flange 114, while no ribs are provided on the second splice plate 117 disposed on the inner side. As shown in FIGS. 11(A) and 11(B), the ribs 120c are provided along the material axis direction from the upper end to the lower end of the first splice plate 107. Although FIGS. 11(A) and 11(B) show an embodiment in which the ribs 120c are provided on both the left and right ends of the first splice plate 107, the attachment positions of the ribs 120c are not limited to those shown in the drawings. The ribs 120c may be provided inward from the left and right ends as long as they do not interfere with bolts and nuts when the first splice plate 107 is attached to the first flange 104 and the second flange 114. As shown in FIG. 12, the rib 120c is brought into contact with the first splice plate 107 and welded at a welded portion 124c (note that the welded portion of the rib 120c is omitted in FIGS. 11(A) and (B)).

[0055] 11(B) and 12, the joint 100 has an opening 122, which makes 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.

[0056] In this way, even if the first support plate 107 has multiple ribs 120 and the second support plate 117 does not have 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.

[0057] [Variation 2] 13, a configuration can be adopted in which a rib 120a is provided in the center of the first support plate 107 and ribs 120c are provided on both sides, and a rib 120b is provided in the center of the second support plate 117. According to the configuration shown in Fig. 13, the number of ribs 120 provided on the first support plate 107 can be increased, thereby further increasing the strength of the joint 100.

[0058] 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 obtain the same effects.

[0059] [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 Embodiment 1. In the following explanation, the differences from Embodiment 1 will be mainly described.

[0060] (1) First Configuration Figures 14(A) and (B) show a joint structure of a steel pipe pole according to a first configuration of this embodiment. In Figure 14, (A) shows a developed view of the joint structure of a steel pipe pole, and (B) shows a perspective view thereof. Figure 15 shows a schematic cross-sectional view of the joint structure of 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).

[0061] As shown in Figures 14(A) and (B), a first flange 104 is provided at one end (lower end) of a first steel pipe pole 102, and a second flange 114 is provided at one end (upper end) of a 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.

[0062] The first flange 104 and the second flange 114 may be formed by notching corners of the respective steel pipe poles. Figures 14(A) and (B) show an embodiment in which a first notch portion 109 and a second notch portion 119 are formed by notching corners of a first steel pipe pole 102 and a second steel pipe pole 112, each having a square cross-sectional shape, thereby forming the first flange 104 and the second flange 114.

[0063] The first steel pipe pole 102 and the second steel pipe pole 112 are joined using first splice plates 105 (105a, 105b) and second splice plates 115 (115a, 115b) whose cross sections are bent into an L shape as shown in the first embodiment. The first splice plates 105 (105a, 105b) are abutted from the outside of the first flange 104 and the second flange 114, and the second splice plates 115 (115a, 115b) are abutted from the inside of the first flange 104 and the second flange 114.

[0064] In the joint structure of the steel pipe column 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.

[0065] FIG. 15 shows the structure of the first steel pipe pole 102 side as a cross-sectional schematic structure of the joint 100. In the first steel pipe pole 102, joints 100a, 100b, 100c, and 100d are formed on each surface by first splice plates 105 (105a, 105b) and second splice plates 115 (115a, 115b). The first flanges 104 are formed to be spaced apart from adjacent first flanges by first cutout portions 109. Although not shown, the second steel pipe pole 112 also has a similar structure. With this configuration, as shown in FIG. 15 and FIG. 14(B), an opening 122 is formed in the joint 100. The opening 122 eliminates the boundary between the inner space and the outer space of the first steel pipe pole 102 and the second steel pipe pole 112, and becomes a region that connects the inner space of the joint 100 to the outside.

[0066] In the first configuration of this embodiment, the openings 122 are formed corresponding to the corners of the steel pipe column, which facilitates bolt connection work. Since the openings 122 are formed corresponding to the respective corners of the steel pipe column, the bolt connection work can be easily performed even if the first support plates 105a, 105b and the second support plates 115a, 115b are divided into left and right sides in the material axis direction.

[0067] Figures 16(A) and (B) show development views of a joint structure for a steel pipe pole according to the first configuration of this embodiment. Figures 17(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 in Figures 16(A) and (B).

[0068] Fig. 16(A) shows a development view in which the rib 120 is provided on the first support plate 105 and the second support plate 115 is flat, and Fig. 17(A) shows a schematic cross-sectional structure of the joint 100. By providing the rib 120 on at least the first support plate 105 (105a, 105b), buckling of the joint 100 can be prevented when a load is applied to the steel pipe column.

[0069] Fig. 16(B) shows a development view in which ribs 120 are provided on the second support plate 115 (115a, 115b) and the first support plate 105 is flat, and Fig. 17(B) shows a cross-sectional schematic structure of the joint 100. By not providing ribs on the first support plate 105, a structure can be achieved in which the ribs do not protrude from the column, and this does not affect the appearance or design.

[0070] The joint structures of the steel pipe poles shown in Figures 14 to 17 are the same as those of the first embodiment except that the configurations of the first steel pipe pole 102 and the first flange 104, and the second steel pipe pole 112 and the second flange 114 are different, and similar effects can be obtained.

[0071] (2) Second Configuration Figures 18(A) and (B) show a joint structure of a steel pipe pole according to a second configuration of this embodiment. In Figure 18, (A) shows a developed view of the joint structure of a steel pipe pole, and (B) shows a perspective view thereof. Figure 19 shows a schematic cross-sectional view of the joint structure of 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 portion 109, and a second flange 114 is formed in the second steel pipe pole 112 by a second notch portion 119. Note that fastening members such as bolts and nuts are omitted from Figure 18(A).

[0072] As shown in FIG. 18(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. As shown in FIG. 19, the first flange 104 and the second flange 114 are sandwiched between the first splice plate 106 and the second splice plate 116 to form the joint 100. As shown in FIG. 19, the ribs 120a, 120b are abutted against the first splice plate 106 and the second splice plate 116 and welded to each other at welds 124a, 124b (note that the welds of the ribs 120a, 120b are omitted in FIGS. 18(A) and 18(B)). As shown in FIGS. 18(B) and 19, even though the joint 100 has an opening 122 and the first splice plate 106 and the second splice plate 116 are provided with the ribs 120a, 120b, bolt construction can be easily performed.

[0073] The joint structures of the steel pipe poles shown in Figures 18(A) and (B) and Figure 19 are the same as those of the second embodiment except that the configurations of the first steel pipe pole 102 and the first flange 104, and the second steel pipe pole 112 and the second flange 114 are different, and similar effects can be obtained.

[0074] Figures 20(A) and (B) show development views of a joint structure of a steel pipe pole according to the second configuration of this embodiment. Figures 21(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 in Figures 20(A) and (B). Also, welded portions are omitted in Figures 20(A) and (B).

[0075] Fig. 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 Fig. 21(A) shows a schematic cross-sectional structure of the joint 100. Fig. 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 Fig. 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.

[0076] The joint structures of the steel pipe poles shown in Figures 18(A) and (B) and Figures 21(A) and (B) are the same as those of the second embodiment except for the configurations 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 obtain the same effects.

[0077] 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.

[0078] (3) Third Configuration Figures 22(A) and (B) show a joint structure of a steel pipe pole according to a third configuration of this embodiment. In Figure 22, (A) shows a developed view of the joint structure of a steel pipe pole, and (B) shows a perspective view thereof. Figure 23 shows a cross-sectional schematic view of the joint structure of 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).

[0079] As shown in Figure 22(A), a first support plate 107 arranged on the outside of the first flange 104 and the second flange 114 is provided with a plurality of ribs 120c, while the second support plate 117 arranged on the inside has no ribs. The first steel pipe column 102 has a first flange 104 formed by a first cutout portion 109, and the second steel pipe column 112 has a second flange 114 formed by a second cutout portion 119.

[0080] As shown in FIG. 22(A), the first splice plate 107 has ribs 120c on both the left and right sides. As shown in FIG. 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 a weld 124c. As shown in FIGS. 22(B) and 23, the joint 100 has an opening 122, and even if the first splice plate 107 has the ribs 120c, the bolt joint can be easily constructed. The ribs 120c may be provided on the first splice plate 107 from the beginning, or the ribs 120c may be welded after the bolt joint is formed.

[0081] The joint structures of the steel pipe poles shown in Figures 22(A) and (B) and Figure 23 are the same as those of the third embodiment except for the configurations of the first steel pipe pole 102 and the first flange 104, and the second steel pipe pole 112 and the second flange 114, and can also be combined with variant example 2 to obtain similar effects.

[0082] [Fifth embodiment] This embodiment shows an example in which a diaphragm is provided on 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.

[0083] (1) First Configuration

[0084] Figures 24(A) and (B) show a joint structure of a steel pipe pole according to the first configuration of this embodiment. In Figure 24, (A) shows a developed 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 in Figure 24(A).

[0085] In a first configuration of this embodiment, a first diaphragm 103 is provided at the end of the first steel pipe pole 102, and a second diaphragm 113 is provided at the end of the second steel pipe pole 112. The first diaphragm 103 is provided so as to close the open end of the first steel pipe pole 102, and the second diaphragm 113 is provided so as to close the open end of the second steel pipe pole 112. The first diaphragm 103 and the second diaphragm 113 are formed of the same steel material as the steel pipe poles. The first diaphragm 103 and the second diaphragm 113 are joined to the first steel pipe pole 102 and the second steel pipe pole 112, respectively, by, for example, welding.

[0086] The first flange 104 is provided so as to stand within the plane of the first diaphragm 103. The first flange 104 is provided so as to correspond to each face of the first steel pipe column 102 within the plane 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.

[0087] 24(A) shows an example in which the first diaphragm 103 and the second diaphragm 113 are arranged to form four faces, but various arrangements are possible without being limited to the arrangement shown in the figure. For example, the first diaphragm 103 and the second diaphragm 113 can be arranged to form a triangle, a pentagon, or a hexagon in a plan view.

[0088] By providing a flange via a diaphragm, the degree of freedom in the strength design of the joint 100 can be increased. That is, a 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 freely arranged within the plane of the diaphragm without being restricted by the column diameter of the steel pipe column.

[0089] As shown in Figures 24(A) and 25, the first flange 104 is provided at a position where it does not overlap with a corner of the first steel pipe pole 102, and the second flange 114 is provided so as not to overlap with a corner of the second steel pipe pole 112. By arranging the flanges in this way, when the first steel pipe pole 102 and the second steel pipe pole 112 are joined, an opening 122 can be formed in the joint portion. Figure 24(B) shows an aspect where an opening 122 is formed in the joint portion 100 when the first steel pipe pole 102 and the second steel pipe pole 112 are joined.

[0090] The first splice plates 105 (105a, 105b) and the second splice plates 115 (115a, 115b) shown in the first embodiment are used in the joint 100. The first splice plates 105 (105a, 105b) are abutted against the outsides of the first flange 104 and the second flange 114, and the second splice plates 115 (115a, 115b) are abutted against the insides of the first flange 104 and the second flange 114.

[0091] In this embodiment as well, the strength of the joint 100 can be increased by providing the 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.

[0092] FIG. 25 is a cross-sectional schematic structure of the joint 100, showing the schematic structure when viewed from the side of the first steel pipe pole 102. In the first steel pipe pole 102, joints 100a, 100b, 100c, and 100d are formed on each surface by first splice plates 105 (105a, 105b) and second splice plates 115 (115a, 115b). The first flanges 104 are formed spaced apart from the adjacent first flanges. Although not shown, the second steel pipe pole 112 has a similar structure. With this configuration, an opening 122 is formed in the joint portion, as shown in FIG. 24(B) and FIG. 25.

[0093] In this embodiment as well, the openings 122 are formed to correspond to the corners of the steel pipe column, which makes it easy to perform bolt joint construction. Since the openings 122 are formed to correspond to each corner of the steel pipe column, the bolt joint work can be easily performed even if the first splice plates 105a, 105b and the second splice plates 115a, 115b are divided into left and right sides in the material axis direction.

[0094] In the joint structure of the steel pipe column 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.

[0095] Figures 26(A) and (B) show development views of a joint structure for a steel pipe pole according to the first configuration of this embodiment. Figures 27(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 in Figures 27(A) and (B).

[0096] Fig. 26(A) shows a development in which the rib 120 is provided on the first splice plate 105 and the second splice plate 115 is flat, and Fig. 27(A) shows a cross-sectional schematic structure of the joint 100. Fig. 26(B) shows a development in which the rib 120 is provided on the second splice plate 115 (115a, 115b) and the first splice plate 105 is flat, and Fig. 27(B) shows a cross-sectional schematic structure of the joint 100. By providing the 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.

[0097] The joint structure of the steel pipe column relating to the first configuration of this embodiment is the same as that of the first embodiment, except that a first diaphragm 103 and a second diaphragm 113 are provided, and similar effects can be obtained.

[0098] (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).

[0099] Figures 30(A) and (B) show development views of a joint structure for a steel pipe pole according to the second configuration of this embodiment. Figures 31(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 in Figures 30(A) and (B).

[0100] 30(A) and 31(B) show a case where the rib 120a is provided on the first support plate 106, and the second support plate 116 is flat and has no ribs. FIGS. 30(B) and 31(B) show a case where the rib 120b is 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.

[0101] The second configuration of this embodiment is similar to the second embodiment except that a diaphragm is provided on the steel pipe column, and similar effects can be obtained.

[0102] 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.

[0103] (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).

[0104] As shown in FIG. 32(A), the first splice plate 107 is provided with ribs 120c, while the second splice plate 117 is not provided with ribs. 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 FIG. 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 ribs 120c are welded to the first splice plate 107 to form welds 124c. As shown in FIGS. 33 and 32(B), an opening 122 is formed in the joint portion, so that the bolt joint can be easily performed even if the first splice plate 107 is provided with the ribs 120c.

[0105] The third configuration of this embodiment is the same as the third embodiment except that a diaphragm is provided on the steel pipe column, and can also be combined with variant example 2 to obtain similar effects.

[0106] [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.

[0107] (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 schematic cross-sectional 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).

[0108] In this embodiment, the second steel pipe pole 112 has a larger pole diameter (poll thickness) than the first steel pipe pole 102. That is, the second steel pipe pole 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.

[0109] 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 one end (lower end) of the first steel pipe column 102 so as to close it, and the second diaphragm 113 is welded to one end (upper end) of the second steel pipe column 112 so as to close it.

[0110] 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 only need to 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, the second diaphragm 113, which is disposed below, is preferably thicker than the first diaphragm 103 in order to increase rigidity and strength.

[0111] The first flange 104 is provided so as to stand within the plane of the first diaphragm 103. The first flange 104 is provided so as to correspond to each face of the first steel pipe pole 102 within the plane 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. Thereby, when the first steel pipe pole 102 and the second steel pipe pole 112 are joined, an opening 122 can be formed in the joint portion. Figure 34(B) shows an aspect in which an opening 122 is formed in the joint portion 100 when the first steel pipe pole 102 and the second steel pipe pole 112 are joined.

[0112] The first splice plates 105 (105a, 105b) and the second splice plates 115 (115a, 115b) shown in the first embodiment are used in the joint 100. The first splice plates 105 (105a, 105b) are abutted against the outsides of the first flange 104 and the second flange 114, and the second splice plates 115 (115a, 115b) are abutted against the insides of the first flange 104 and the second flange 114.

[0113] In this embodiment as well, the strength of the joint 100 can be increased by providing the 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.

[0114] Figure 35(A) shows a schematic cross-sectional structure of the joint 100 viewed from the side of the second steel pipe pole 112, and Figure 35(B) shows a schematic cross-sectional structure of the joint 100 viewed from the side of the first steel pipe pole 102. Joints 100a, 100b, 100c, and 100d are formed on each surface of the first steel pipe pole 102 by first splice plates 105 (105a, 105b) and second splice plates 115 (115a, 115b). The first flanges 104 are formed spaced apart from the adjacent first flanges. Although not shown, the second steel pipe pole 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.

[0115] In this embodiment as well, the openings 122 are formed to correspond to the corners of the steel pipe column, which makes it easy to perform bolt joint construction. Since the openings 122 are formed to correspond to each corner of the steel pipe column, the bolt joint work can be easily performed even if the first splice plates 105a, 105b and the second splice plates 115a, 115b are divided into left and right sides in the material axis direction.

[0116] In the joint structure of the steel pipe column 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.

[0117] Furthermore, by providing a diaphragm at the end of the steel pipe pole, steel pipe poles of different diameters can be joined. In addition, the thickness of the flange can be made larger relative to the thickness of the steel pipe pole, thereby increasing the strength of the joint.

[0118] Figures 36(A) and (B) show development views of a joint structure for a steel pipe pole 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 in Figures 37(A) and (B).

[0119] Fig. 36(A) shows a development in which the rib 120 is provided on the first splice plate 105 and the second splice plate 115 is flat, Fig. 37(A) shows a schematic cross-sectional structure of the joint 100 looking at the side of the second steel pipe column 112, and Fig. 37(B) shows a schematic cross-sectional structure of the joint 100 looking at the side of the first steel pipe column 102. Fig. 36(B) shows a development in which the rib 120 is provided on the second splice plate 115 (115a, 115b) and the first splice plate 105 is flat, Fig. 38(A) shows a schematic cross-sectional structure of the joint 100 looking at the side of the second steel pipe column 112, and Fig. 38(B) shows a schematic cross-sectional structure of the joint 100 looking at the side of the first steel pipe column 102. By providing a rib 120 on one of the first support plate 105 (105a, 105b) and the second support plate 115 (115a, 115b), buckling of the joint 100 can be prevented when a load is applied to the steel pipe column.

[0120] The joint structure of the steel pipe column in the first configuration of this embodiment is similar to the first 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.

[0121] (2) Second Configuration Figures 39(A) and (B) show a joint structure of a steel pipe pole according to a second configuration of this embodiment. In Figure 39, (A) shows a developed view of the joint structure of a steel pipe pole, and (B) shows a perspective view thereof. Figure 40 shows a cross-sectional schematic view of the joint structure of 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).

[0122] Fig. 41(A) shows a development in which the rib 120a is provided on the first splice plate 105 and the second splice plate 116 is flat, Fig. 42(A) shows a schematic cross-sectional structure of the joint 100 looking at the side of the second steel pipe pole 112, and Fig. 42(B) shows a schematic cross-sectional structure of the joint 100 looking at the side of the first steel pipe pole 102. Fig. 41(B) shows a development in which the rib 120b is provided on the second splice plate 116 and the first splice plate 106 is flat, Fig. 43(A) shows a schematic cross-sectional structure of the joint 100 looking at the side of the second steel pipe pole 112, and Fig. 43(B) shows a schematic cross-sectional structure of the joint 100 looking at the side of the first steel pipe pole 102. Note that fastening members such as bolts and nuts are omitted in Figs. 41(A) and (B).

[0123] 41(A), 41-1(A), and (B) show a case where the rib 120a is provided on the first support plate 106, and the second support plate 116 is flat and has no ribs. FIG. 30(B) and 43(A) and (B) show a case where the rib 120b is 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.

[0124] The joint structure of the steel pipe column in the second 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.

[0125] 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.

[0126] (3) Third Configuration Figures 44(A) and (B) show a joint structure of a steel pipe pole according to a third configuration of this embodiment. In Figure 44, (A) shows a developed view of the joint structure of a steel pipe pole, and (B) shows a perspective view thereof. Figure 45 shows a cross-sectional schematic view of the joint structure of 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).

[0127] As shown in FIG. 44(A), the first splice plate 107 is provided with ribs 120c, while the second splice plate 117 is not provided with ribs. 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 FIG. 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 ribs 120c are welded to the first splice plate 107 to form welds 124c. As shown in FIGS. 45 and 44(B), an opening 122 is formed in the joint portion, so that the bolt joint can be easily performed even if the first splice plate 107 is provided with the ribs 120c.

[0128] 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. [Explanation of symbols]

[0129] 100....Connection portion, 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 portion, 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

1. 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;

2. 2. The steel pipe column joint structure according to claim 1, wherein the support plate has an L-shaped cross-sectional shape, 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 becomes the rib.

3. 3. The steel pipe column joint structure according to claim 2, wherein the splice plate comprises a plurality of splice plates, and the plurality of splice plates are 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.

4. The steel pipe column joint structure according to claim 1 , wherein the rib is provided in the center portion of the splice plate.

5. The steel pipe column joint structure according to claim 1 , wherein the ribs are provided on both sides of the support plate.

6. A joint structure of a steel pipe column described in any one of claims 1 to 5, comprising a second support plate in contact with the inner plate surface of the first flange and the 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.

7. 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.

8. 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;

9. The first auxiliary plate has a plate thickness that is approximately the same as or greater than the height of the first flange protruding 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.

10. 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.

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