Steel pipe column joint structure

Abstract

To maintain strength of a joint structure for connecting steel pipe columns while reducing weld parts as much as possible.SOLUTION: A joint structure of a steel pipe column includes a first diaphragm disposed on one end of a first steel pipe column, a first flange fixed to the first diaphragm, a second diaphragm disposed on one end of a second steel pipe column, a second flange fixed to the second diaphragm, and a first doubling plate. The first steel pipe column and the second steel pipe column are disposed one above the other along a material axis direction. The first flange and the second flange are connected with bolts through the first doubling plate. A first open hole capable of being used as a hand hole is disposed either one of the first flange or the second flange.SELECTED DRAWING: Figure 1

Description

[Technical field]

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

[0002] At construction sites of buildings, welding and bolting are used as methods for joining steel frame members. While welding can, in principle, ensure sufficient strength, it requires advanced skills and time, and the strength of the joint is influenced by the skill of the worker. In contrast, bolting has the advantages of being able to shorten the construction period, being less influenced by the skill of the worker, and facilitating quality control. There are various types of bolting; for example, a method for joining a steel pipe column to an H-shaped steel beam and a method for 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] JP-A-5-179702 (Patent No. 3146209) [Patent Document 2] JP 2004-293196 A (Patent No. 4038449) Summary of the Invention [Problem to be solved by the invention]

[0004] When bolting steel members, it is easy to bolt members with an open cross-sectional shape, such as H-shaped steel beams. However, when bolting tubular members such as square steel pipe columns, the construction is not easy because they have a closed cross-sectional shape. It is also possible to process a part of the steel pipe column to make the bolt connection easier, but there is a concern that this will reduce the strength of the joint.

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

[0006] A joint structure of a steel pipe column according to one embodiment of the present invention includes a first diaphragm provided at one end of a first steel pipe column, a first flange fixed to the first diaphragm, arranged parallel to the material axis direction of the first steel pipe column, and having a first through hole, a second diaphragm provided at one end of a second steel pipe column, a second flange fixed to the second diaphragm, arranged parallel to the material axis direction of the second steel pipe column, and having a second through hole, a third flange fixed to the first diaphragm, arranged parallel to the material axis direction of the first steel pipe column, and adjacent to the first flange, a fourth flange fixed to the second diaphragm, arranged parallel to the material axis direction of the second steel pipe column, and adjacent to the second flange, a first support plate, and a second support plate. The first and second steel pipe columns are arranged in the vertical direction, the first and fourth flanges, and the second and third flanges are arranged side by side in the material axial direction. The first and fourth flanges are bolted together with a first splice plate, the second and third flanges are bolted together with a second splice plate, and the first and second through holes are arranged in an oblique manner. Effect of the Invention

[0007] According to a steel pipe joint structure of one embodiment of the present invention, a first steel pipe column and a second steel pipe column arranged vertically are each provided with a diaphragm and a plurality of flanges having through holes fixed to each diaphragm, and at least one set of through holes are arranged diagonally, which facilitates the construction of bolt joints and prevents a decrease in the strength of the joint. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view of a joint structure of a steel pipe column according to one embodiment of the present invention, in which (A) shows an exploded view and (B) shows a bolted joint in the joint structure of two steel pipe columns. [Diagram 2] FIG. 2 is a front view of a bolt joint in a steel pipe column joint structure according to one embodiment of the present invention. [Diagram 3] 3 shows cross-sectional structures of a bolt joint in the joint structure of steel pipe columns shown in FIG. 2, where (A) shows the cross-sectional structure on the first steel pipe column side, and (B) shows the cross-sectional structure on the second steel pipe column side. [Figure 4] FIG. 1 is a perspective view of a joint structure of a steel pipe column according to one embodiment of the present invention, in which (A) shows an exploded view and (B) shows a bolted joint in the joint structure of two steel pipe columns. [Diagram 5] FIG. 2 is a front view of a bolt joint in a steel pipe column joint structure according to one embodiment of the present invention. [Figure 6] 6 shows cross-sectional structures of a bolt joint in the joint structure of steel pipe columns shown in FIG. 5, where (A) shows the cross-sectional structure on the first steel pipe column side, and (B) shows the cross-sectional structure on the second steel pipe column side. [Figure 7] FIG. 1 is a perspective view of a joint structure of a steel pipe column according to one embodiment of the present invention, in which (A) shows an exploded view and (B) shows a bolted joint in the joint structure of two steel pipe columns. [Figure 8] FIG. 2 is a perspective view of a joint structure for a steel pipe column according to one embodiment of the present invention, showing a bolted joint in the joint structure for two steel pipe columns. [Figure 9] 9A and 9B show cross-sectional structures of a bolted joint in the joint structure of the steel pipe column shown in FIG. 8, in which (A) shows the cross-sectional structure corresponding to line D1 and (B) shows the cross-sectional structure corresponding to line D2. [Figure 10] FIG. 1 is a perspective view of a joint structure of a steel pipe column according to one embodiment of the present invention, in which (A) shows an exploded view and (B) shows a bolted joint in the joint structure of two steel pipe columns. [Figure 11] FIG. 2 is a front view of a bolt joint in a steel pipe column joint structure according to one embodiment of the present invention. [Figure 12] The cross-sectional structure of a bolted joint in the joint structure of the steel pipe column shown in Figure 11 is shown. [Figure 13] FIG. 1 is a perspective view of a joint structure of a steel pipe column according to one embodiment of the present invention, in which (A) shows an exploded view and (B) shows a bolted joint in the joint structure of two steel pipe columns. [Figure 14] 14 shows cross-sectional structures of a bolted joint in the joint structure of the steel pipe column shown in FIG. 13, where (A) shows the cross-sectional structure corresponding to line D3 and (B) shows the cross-sectional structure corresponding to line D4. [Figure 15] FIG. 1 is a perspective view of a joint structure of a steel pipe column according to one embodiment of the present invention, in which (A) shows an exploded view and (B) shows a bolted joint in the joint structure of two steel pipe columns. [Figure 16] 16 shows cross-sectional structures of a bolt joint in the joint structure of steel pipe columns shown in FIG. 15, where (A) shows the cross-sectional structure on the first steel pipe column side, and (B) shows the cross-sectional structure on the second steel pipe column side. [Figure 17] 1A and 1B show cross-sectional structures of a bolt joint in a steel pipe column joint structure according to one embodiment of the present invention, in which (A) shows the cross-sectional structure on the first steel pipe column side, and (B) shows the cross-sectional structure on the second steel pipe column side. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, the contents of the embodiment of the present invention will be described with reference to the drawings. However, the present invention includes many different aspects, and is not to be interpreted as being limited to the contents of the embodiment exemplified below. In order to make the explanation clearer, the width, thickness, shape, etc. of each part may be shown diagrammatically 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 shown in a certain drawing and an element shown in another drawing are identical or correspond to each other, the same symbol (or a symbol with a, b, etc. added after the number shown as the symbol) may be added, and repeated explanations may be omitted as appropriate. Furthermore, the letters "first" and "second" added to each element are convenient marks used to distinguish each element, and have no further meaning unless otherwise explained.

[0010] [First embodiment] A joint structure of 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 portion. Hereinafter, the joint structure will be described in detail.

[0011] Fig. 1(A) shows a development view of the joint structure of the steel pipe pole according to the present embodiment, and Fig. 1(B) shows a perspective view thereof. Note that in Fig. 1(A), fastening members such as bolts and nuts are omitted. Note that Fig. 1(A) and (B) show the case where the first steel pipe pole 102 and the second steel pipe pole 112 are square steel pipe poles.

[0012] In the following description, for convenience, the first steel pipe column 102 has four faces, and each face is indicated clockwise by a reference number as a first face 11, a second face 12, a third face 13, and a fourth face 14, and the second steel pipe column 112 is similarly indicated clockwise by a reference number as a first face 21, a second face 22, a third face 23, and a fourth face 24. In addition, unless otherwise specified, when the steel pipe columns are erected, the first steel pipe column 102 is disposed on the lower side, and the second steel pipe column 112 is disposed on the upper side in the material axis direction.

[0013] As shown in Fig. 1(A), a first diaphragm 104 is provided at one end of a first steel pipe column 102, and a second diaphragm 114 is provided at one end of a second steel pipe column 112. The first diaphragm 104 and the second diaphragm 114 are welded to the first steel pipe column 102 and the second steel pipe column 112, respectively.

[0014] The first flanges 106a, 106b and the third flanges 108a, 108b are attached to the first diaphragm 104. The first flanges 106a, 106b have substantially the same shape, are erected on the first diaphragm 104, and are arranged to face each other at a predetermined interval. The third flanges 108a, 108b are erected on the first diaphragm 104, are oriented in a direction intersecting the direction in which the first flanges 106a, 106b face each other, and are arranged to face each other at a predetermined interval. FIG. 1(A) shows an embodiment in which the first flange 106a is arranged corresponding to the 11th surface, the first flange 106b is arranged corresponding to the 13th surface, the third flange 108a is arranged corresponding to the 12th surface, and the third flange 108b is arranged corresponding to the 14th surface. By arranging the flanges in this manner, an area is formed on the first diaphragm 104 that is surrounded by the first flange 106a, the first flange 106b, the third flange 108a, and the third flange 108b.

[0015] The first flange 106a is flat and has a first through hole 120 and a plurality of bolt holes 110. When the first flange 106a is viewed in the vertical direction, the first through hole 120 is disposed on the first diaphragm 104 side. That is, the first through hole 120 is disposed in a region between one side where the first flange 106a contacts the first diaphragm 104 and a region where the plurality of bolt holes 110 are provided. The first flange 106b has the same form as the first flange 106a, and is provided with a third through hole 124 in addition to the plurality of bolt holes. On the other hand, the third flanges 108a and 108b are not provided with through holes corresponding to the first through hole 120 and the third through hole 124, and only the plurality of bolt holes 110 are provided.

[0016] The second flanges 116a, 116b and the fourth flanges 118a, 118b are attached to the second diaphragm 114. The second flanges 116a, 116b have substantially the same shape, are erected on the second diaphragm 114, and are arranged to face each other at a predetermined interval. The fourth flanges 118a, 118b are erected on the second diaphragm 114, are oriented in a direction intersecting the direction in which the second flanges 116a, 116b face each other, and are arranged to face each other at a predetermined interval. FIG. 1(A) shows an embodiment in which the second flange 116a is arranged corresponding to the 22nd surface, the second flange 116b is arranged corresponding to the 24th surface, the fourth flange 118a is arranged corresponding to the 21st surface, and the fourth flange 118b is arranged corresponding to the 23rd surface. By arranging the flanges in this manner, an area is formed on the second diaphragm 114 that is surrounded by the second flange 116a, the second flange 116b, the fourth flange 118a, and the fourth flange 118b.

[0017] The second flange 116a is flat and has a second through hole 122 and a plurality of bolt holes 110. When the second flange 116a is viewed in the vertical direction, the second through hole 122 is disposed on the second diaphragm 114 side. That is, the second through hole 122 is disposed in a region between one side where the second flange 116a contacts the second diaphragm 114 and a region where the plurality of bolt holes 110 are provided. The second flange 116b has the same form as the second flange 116a, and in addition to the plurality of bolt holes, a fourth through hole 126 (not shown) is provided. On the other hand, the fourth flanges 118a and 118b are not provided with through holes corresponding to the second through hole 122 and the fourth through hole 126, and only the plurality of bolt holes 110 are provided.

[0018] There is no limitation on the size of the first through hole 120, the second through hole 122, the third through hole 124, and the fourth through hole 126 (not shown). Since these through holes are used as hand holes, it is preferable that they have a hole diameter that allows an operator to insert a tool or the like to perform bolt joint construction. There is no limitation on the shape of these through holes, and they may be circular as shown in FIG. 1(A), elliptical, rectangular, or any polygonal shape. In addition, the bolt holes 110 provided in each flange are through holes that have a diameter that allows a bolt, which is a fastener, to be inserted and that penetrate the flange, and a plurality of bolt holes are appropriately provided.

[0019] The first support plates 130a, 130b are disposed on the outer sides of the first flange 106a, the second flange 116a, the third flange 108a, and the fourth flange 118a, and the second support plates 140a, 140b are disposed on the inner sides of the first flange 106a, the second flange 116a, the third flange 108a, and the fourth flange 118a. The first support plates 130a, 130b and the second support plates 140a, 140b are provided with bolt holes 111 corresponding to the bolt holes 110 provided in the flange faces.

[0020] The fourth flange 118a is disposed at a position corresponding to the first flange 106a, and the third flange 108a is disposed at a position corresponding to the second flange 116a. Similarly, the fourth flange 118b is disposed at a position corresponding to the first flange 106b, and the third flange 108b is disposed at a position corresponding to the second flange 116b.

[0021] The first flanges 106a, 106b and the second flanges 116a, 116b are formed so that the length in the material axis direction is longer than the third flanges 108a, 108b and the fourth flanges 118a, 118b. In other words, the first flange 106a has a region in which the first through hole 120 is provided to provide a plurality of bolt holes 110, which is located higher than the region in which the third flange 108a has a plurality of bolt holes 110. The second flange 116a has a region in which the second through hole 122 is provided to provide a plurality of bolt holes 110, which is located lower than the region in which the fourth flange 118a has a plurality of bolt holes 110. The same positional relationship applies to the relationship between the first flange 106b and the third flange 108b and the relationship between the second flange 116b and the fourth flange 118b.

[0022] FIG. 1(B) shows an embodiment in which a first bolted joint 100a and a second bolted joint 100b are formed by vertically arranging and connecting a first steel pipe pole 102 and a second steel pipe pole 112 (although not shown, a third bolted joint 100c and a fourth bolted joint 100d are formed on the back side). The first bolted joint 100a is formed by sandwiching a first flange 106a and a fourth flange 118a between a first splice plate 130a and a second splice plate 140a and fastening them with bolts and nuts. In the first bolted joint 100a, the first splice plate 130a abuts against the outer surfaces of the first flange 106a and the fourth flange 118a, and the second splice plate 140a abuts against the inner surfaces of the first flange 106a and the fourth flange 118a. Similarly, the second bolt joint 100b is formed by sandwiching the second flange 116a and the third flange 108a between a first splice plate 130b and a second splice plate 140b and fastening them together with bolts and nuts. The first splice plate 130b abuts against the outer surfaces of the third flange 108 and the second flange 116, and the second splice plate 140b abuts against the inner surfaces of the third flange 108 and the second flange 116.

[0023] The first steel pipe column 102 and the second steel pipe column 112 are made of steel materials. The first diaphragm 104, the second diaphragm 114, the first flanges 106a, 106b, the second flanges 108a, 108b, the third flanges 108a, 108b, the fourth flanges 118a, 118b, the first splice plates 130a, 130b, and the second splice plates 140a, 140b are also made of steel materials. For example, structural rolled steel is used as the steel material. Note that, although FIG. 1(A) shows the first splice plates 130a, 130b arranged on the outside and the second splice plates 140a, 140b arranged on the inside, the splice plates abutting on the inside or outside can be omitted if the strength of the bolt joint is sufficiently maintained.

[0024] FIG. 2 shows a front view of the joint structure of the steel pipe pole according to this embodiment. FIG. 2 shows that the first bolt joint portion 100a is formed on the first surface 11 of the first steel pipe pole 102 and the first surface 21 of the second steel pipe pole 112, and similarly, the second bolt joint portion 100b is formed on the second surface 12 and the second surface 22, and the fourth bolt joint portion 100d is formed on the fourth surface 14 and the fourth surface 24 (although not shown, the third bolt joint portion 100c is formed on the third surface 13 and the third surface 23). In the first bolt joint portion 100a, the first splice plate 130a and the second splice plate (140a: not shown) abut against both the first flange 106a and the fourth flange 118a and have a size that does not cover the first through hole 120. This configuration also applies to the second bolted joint 100b, the third bolted joint (100c: not shown), and the fourth bolted joint 100d.

[0025] As described with reference to Figs. 1(A) and (B), the area where the bolt holes 110 are formed in the first flange 106a is different in height from the area where the bolt holes 110 are formed in the third flange 108a, and the area where the bolt holes 110 are formed in the second flange 116a is different in height from the area where the bolt holes 110 are formed in the fourth flange 108a. Therefore, the heights of the first bolt joint 100a (and the third bolt joint 100c, not shown) are different from the heights of the second bolt joint 100b and the fourth bolt joint 100d. The first through hole 120 is located below the first bolt joint 100a (the same is true for the third through hole 124, not shown), the second through hole 122 is located above the second bolt joint, and the fourth through hole 126 is located above the fourth bolt joint 100d.

[0026] In this way, by making the heights of the bolt joints and through holes formed on adjacent faces different and arranging them in an oblique manner, not all of the through holes arranged on each face of the steel pipe column are arranged at the same height, thereby increasing the resistance of the steel pipe column to axial forces, shear forces, and bending stresses acting on the steel pipe column.

[0027] As shown in FIG. 2, for example, the first through hole 120 is arranged on the lower side of the first bolt joint 100a, and the second through hole 122 and the fourth through hole 126 are arranged at the same height on the adjacent surface. In this way, by arranging a plurality of through holes with different heights for one bolt joint, the worker can easily perform the work of joining the first steel pipe pole 102 and the second steel pipe pole 112. That is, when performing construction, the worker can insert tools or the like through a plurality of through holes with different heights and directions to easily perform the bolt joint work. For example, when constructing the first bolt joint 100a, the worker can insert tools or the like not only through the first through hole 120 but also through the second through hole 122 and the fourth through hole 126 to perform the work. In this case, the second through hole 122 and the fourth through hole 126 are arranged at different heights and in different directions relative to the first through hole 120, making it possible to insert tools, etc. into the inside of the steel pipe column from various angles, thereby increasing the freedom of work.

[0028] 3A shows a cross-sectional structure of the area sandwiched between arrows A1 and A2 in FIG. 2, and FIG. 3B shows a cross-sectional structure of the area sandwiched between arrows B1 and B2 in FIG.

[0029] As shown in FIG. 3(A), on the surface of the first diaphragm 104, the first flange 106a and the first flange 106b are arranged to face each other, and the third flange 108a and the third flange 108b are arranged to face each other. By arranging the flanges in this manner, the first through hole 120 is arranged on the first surface 11 side of the first steel pipe column 102, and the third through hole 124 is arranged on the third surface 13 side. In addition, the second bolt joint 100b is formed on the second surface 12 side of the first steel pipe column 102, and the fourth bolt joint 100d is formed on the fourth surface 14 side. In addition, as shown in FIG. 3(B), on the surface of the second diaphragm 114, the second flange 116a and the second flange 116b are arranged to face each other, and the fourth flange 118a and the fourth flange 118b are arranged to face each other. By arranging the flanges in this manner, the second through hole 122 is arranged on the second surface 22 side of the second steel pipe column 112, and the fourth through hole 126 is arranged on the fourth surface 24 side. In addition, the first bolt joint 100a is formed on the first surface 21 side of the second steel pipe column 112, and the third bolt joint 100c is formed on the third surface 23.

[0030] As shown in FIG. 3(A), the second bolt joint 100b is formed by sandwiching the third flange 108a between the first splice plate 130b and the second splice plate 140b, inserting bolts 150 into the bolt holes 110 and 111, and fastening them with nuts 152. The third flange 108a has a smaller cross-sectional area in the bolt hole 110 than in the other parts, but the first splice plate 130b and the second splice plate 140b compensate for the reduction in cross-sectional area and suppress the reduction in shear strength. The plate thicknesses of the first splice plate 130a and the second splice plate 140b can be set appropriately. This configuration is the same for the first bolt joint 100a, the third bolt joint 100c, and the fourth bolt joint 100d.

[0031] 3(A) and 3(B) together, through holes are arranged in four directions so as to be sandwiched between the bolted joints in the joint portion between the first steel pipe column 102 and the second steel pipe column 112. In such a joint structure, by making the length in the material axial direction of the flange in which the through holes are provided different from that of the flange in which the through holes are not provided, and by bolting these two types of flanges, the positions of the through holes and the positions of the bolted joints can be arranged in an oblique manner, as shown in Figs. 1(B) and 2. Specifically, the first flanges 106a, 106b and the third flanges 108a, 108b, which have different lengths in the material axis direction, are provided on the side of the first steel pipe column 102, and the second flanges 116a, 116b and the fourth flanges 118a, 118b, which have different lengths in the material axis direction, are provided on the side of the second steel pipe column 112, and these flanges are arranged to interlock with each other to form a bolt joint, whereby the heights of the first through hole 120 and the third through hole 124 and the second through hole 122 and the fourth through hole 126 can be made different. By having the flanges provided at the joint portion have such a configuration, the workability of the bolt joint for connecting the first steel pipe column 102 and the second steel pipe column 112 can be improved.

[0032] According to this embodiment, the first through hole 120, the second through hole 122, the third through hole 124, and the fourth through hole 126 are used as hand holes, and bolts are set from the inside of the joint portion where the flanges are arranged, and the bolts are tightened, so that two steel pipe columns can be joined at the construction site. Bolt joining is technically easier than welding, and the quality can be stabilized by following the procedure. In addition, by arranging multiple through holes that can be used as hand holes in an oblique shape (with different opening directions), the amount of welding at the construction site can be minimized, the workability of the bolt joining can be improved, and a joint structure can be obtained in which the strength of the joint portion is equal to or greater than that of the other portions.

[0033] In this embodiment, the flanges are arranged corresponding to each surface of the steel pipe column, but the arrangement of the flanges is not limited to this, and the flanges may be arranged to bridge two adjacent surfaces. For example, in the first steel pipe column 102, the first flange 106a may be arranged to bridge the first surface 11 and the second surface 12. Such an arrangement is similar in other embodiments.

[0034] [Second embodiment] This embodiment shows a different arrangement of the flange having the through hole from that of the first embodiment. The following description will focus on the differences from the first embodiment.

[0035] Fig. 4(A) shows a development view of a joint part of a steel pipe pole according to this embodiment, and Fig. 4(B) shows a perspective view of the joint part of a steel pipe pole. Note that in Fig. 4(A), fasteners such as bolts and nuts are omitted.

[0036] As shown in FIG. 4(A), a first flange 106a having a first through hole 120 corresponding to the first surface 11 is provided on the first diaphragm 104, and a first flange 106b having a second through hole 122 corresponding to the second surface 12 is provided. Although not shown in FIG. 4(A), a third flange 108a is provided corresponding to the third surface 13, and a third flange 108b is provided corresponding to the fourth surface 14. On the other hand, on the side of the second steel pipe column 112, a fourth flange 118a is provided corresponding to the first surface 21, and a fourth flange 118b is provided corresponding to the second surface 22. In addition, a second flange 116a having a third through hole 124 corresponding to the third surface 23 is provided on the side of the second steel pipe column 112, and a second flange 116b having a fourth through hole 126 corresponding to the fourth surface 24 is provided.

[0037] That is, in this embodiment, the first flange 106a and the first flange 106b are arranged so as to correspond to two adjacent faces of the first steel pipe column 102, and the second flange 116a and the second flange 116b are arranged so as to correspond to two adjacent faces of the second steel pipe column 112. The first flange 106a and the first flange 106b, and the second flange 116a and the second flange 116b are arranged in series vertically so as not to overlap.

[0038] In other words, the first flange 106a and the first flange 106b, and the second flange 116a and the second flange 116b are arranged to form an L shape. Then, as shown in FIG. 4(B), when the first steel pipe column 102 and the second steel pipe column 112 are connected, these two L-shaped structures are arranged to interlock with each other. As a result, on the first surface 11 and the first surface 21 side and the second surface 12 and the second surface 22 side, the first bolt joint 100a and the second bolt joint 100b are arranged at the same height, and the first through hole 120 and the second through hole 122 are arranged below these bolt joints. Although not shown in FIG. 4(B), on the sides of third surface 13 and third surface 23, and on the sides of fourth surface 14 and fourth surface 24, second flanges 116a and 116b form a structure in which the arrangement of the bolt joints and through holes is reversed from that on the front side shown in the figure.

[0039] 5 shows a front view of the joint structure of a steel pipe pole according to this embodiment. A first bolt joint 100a is formed on the first surface 11 and the first surface 21 of the steel pipe pole, a second bolt joint 100b is formed on the second surface 12 and the second surface 22, and a fourth bolt joint 100d is formed on the fourth surface 14 and the fourth surface 24 (although not shown, a third bolt joint 100c is formed on the third surface 13 and the third surface 23).

[0040] As shown in Fig. 5, the first through hole 120 and the second through hole 122 are disposed at the same height on two adjacent faces. In other words, the first through hole 120 is disposed below the first bolt joint 100a, and the second through hole 122 is disposed below the second bolt joint 100b. Although not shown in Fig. 5, the fourth through hole 126 is disposed at the same height as the third through hole 124, which is not shown. The fourth through hole 126 is disposed above the fourth bolt joint 100d.

[0041] 6(A) shows the cross-sectional structure of the area sandwiched between the arrows A3 and A4 in FIG. 5, and FIG. 6(B) shows the cross-sectional structure of the area sandwiched between the arrows B2 and B4 in FIG.

[0042] As shown in FIG. 6(A), the first flange 106a and the first flange 106b are arranged in an L-shape on the surface of the first diaphragm 104, and the third flange 108a and the third flange 108b are arranged in an inverted L-shape. With such an arrangement of the flanges, the first through hole 120 is arranged on the first surface 11 side of the first steel pipe column 102, and the second through hole 122 is arranged at the same height on the second surface 12 side. In addition, the third bolt joint 100c is formed on the third surface 13 side of the first steel pipe column 102, and the fourth bolt joint 100d is formed at the same height on the fourth surface 14 side. In addition, as shown in FIG. 6(B), the second flange 116a and the second flange 116b are arranged in an inverted L-shape on the surface of the second diaphragm 114, and the fourth flange 118a and the fourth flange 118b are arranged in an L-shape. By arranging the flanges in this manner, a third through hole 124 is arranged on the third surface 23 side of the second steel pipe column 112, and a fourth through hole 126 is arranged at the same height on the fourth surface 24 side. In addition, a first bolt joint 100a is formed on the first surface 21 side of the second steel pipe column 112, and a second bolt joint 100b is formed at the same height on the second surface 22. As shown in Figures 6(A) and (B) in cross-sectional view, through holes are arranged on each of the four surfaces of the steel pipe column, and bolt joints are formed.

[0043] Thus, the joint structure of the steel pipe column according to the present embodiment has a structure in which through holes of the same height are provided on two adjacent faces, and through holes of the same height are provided on two other adjacent faces opposite to the two adjacent faces, and the heights of the through holes are different between the two adjacent faces and the other two adjacent faces. According to such an arrangement of through holes, for example, it is possible to improve the workability when constructing a bolt joint using both arms. And, by arranging such a set of through holes in an oblique shape with different heights, it is possible to improve the workability when forming a bolt joint on each face, and it is possible to obtain a joint structure in which the amount of welding at the construction site is reduced as much as possible, the workability of the bolt joint is improved, and the strength of the joint part is equal to or greater than that of the other parts. Also, by not arranging all of the through holes arranged on each face of the steel pipe column at the same height, it is possible to suppress a decrease in the strength of the joint part.

[0044] [Third embodiment] This embodiment shows an aspect in which the configuration of the flange in which the through hole is provided is different from that of the first and second embodiments. The following mainly describes the parts that are different from the first embodiment.

[0045] Fig. 7(A) shows a development view of the joint part of the steel pipe pole according to this embodiment, and Fig. 7(B) and Fig. 8 show perspective views of the joint part of the steel pipe pole. Also, Fig. 9(A) and (B) show cross-sectional structures corresponding to the lines D1 and D2 shown in Fig. 7(B) and Fig. 8, respectively. Note that in Fig. 7(A), fasteners such as bolts and nuts are omitted.

[0046] As shown in Fig. 7(A), the first flange 106a is provided on the first steel pipe pole 102 side in correspondence with the first surface 11, and the third flanges 108a, 108b, 108c are provided in correspondence with the 12th, 13th, and 14th surfaces. The first flange 106a is provided with a first through hole 120, and the third flanges 108a, 108b, 108c are provided with only bolt holes 110, and no through holes for forming hand holes are provided. The second steel pipe pole 112 side is provided with a fourth flange 118a in correspondence with the 21st surface, and the second flanges 116a, 116b, 116c are provided in correspondence with the 22nd, 23rd, and 24th surfaces. The second flange 116a is provided with a second through hole 122, and although not shown, the second flange 116b is provided with a third through hole 124, and the second flange 116c is provided with a fourth through hole 126. The fourth flange 118a is provided with only the bolt holes 110, and is not provided with a through hole forming a hand hole.

[0047] Fig. 7(B) shows a state in which the first steel pipe pole 102 and the second steel pipe pole 112 having such an arrangement are connected by bolt fastening. Fig. 7(B) is a perspective view seen from the first surface 11 and the second surface 12 of the first steel pipe pole 102 and the first surface 21 and the second surface 22 of the second steel pipe pole 112. In contrast, Fig. 8 shows a perspective view seen from the third surface 13 and the fourth surface 14 of the first steel pipe pole 102 and the third surface 23 and the fourth surface 24 of the second steel pipe pole 112.

[0048] As shown in Fig. 7(B) and Fig. 8, the first through hole 120 is arranged on the side closer to the first steel pipe column 102, whereas the second through hole 122, the third through hole 124, and the fourth through hole 126 are arranged on the side closer to the second steel pipe column 112. Thus, in this embodiment, the second through hole 122, the third through hole 124, and the fourth through hole 126 are arranged at different heights with respect to the first through hole 120. In other words, the set of the second through hole 122, the third through hole 124, and the fourth through hole 126 is arranged in an oblique manner with respect to the first through hole 120.

[0049] As shown in FIG. 9(A), the first through hole 120, the second bolt joint 100b, the third bolt joint 100c, and the fourth bolt joint 100d are arranged on the first diaphragm 104 side. On the other hand, as shown in FIG. 9(B), the second through hole 122, the third through hole 124, the fourth through hole 126, and the first bolt joint 100a are arranged on the second diaphragm 114 side. Thus, in this embodiment, the through holes provided on three faces are at the same height, and the height of the through hole provided on the other face is different. By arranging the three through holes at the same height as in this embodiment, even if multiple people are working on the construction, they can work simultaneously without interfering with each other. In this case, by making the height of at least one through hole different, tools and the like can be inserted from different angles, and the workability of the bolt joint can be improved. The second through hole 122, the third through hole 124, and the fourth through hole 126 are each arranged obliquely relative to the first through hole 120, thereby improving the workability when forming bolt joints on each surface, minimizing the amount of welding at the construction site, improving the workability of bolt joints, and obtaining a joint structure in which the strength of the joints is equal to or greater than that of other parts. Also, by not all of the through holes arranged on each surface of the steel pipe column being arranged at the same height, a decrease in the strength of the joints can be suppressed.

[0050] In addition, this embodiment shows a structure in which a first through hole 120 is provided on the side of the first steel pipe column 102, and a second through hole 122, a third through hole 124, and a fourth through hole 126 are provided on the side of the second steel pipe column 112, but the same effect can be obtained even if the arrangement of such through holes is reversed upside down.

[0051] [Fourth embodiment] This embodiment shows an example in which a reinforcing plate is further provided in the joint structure of a steel pipe pole shown in the first embodiment. In the following, the differences from the first embodiment will be mainly described.

[0052] Fig. 10(A) shows a development view of a joint portion in a joint structure of a steel pipe pole according to this embodiment, and Fig. 10(B) shows a perspective view of the joint structure of a steel pipe pole according to this embodiment. Note that in Fig. 10(A), fastening members such as bolts and nuts are omitted.

[0053] As shown in Figs. 10(A) and (B), a first reinforcing plate 144a (also called a web) is provided in an area surrounded by the first flanges 106a, 106b and the third flanges 108a, 108b. The first reinforcing plate 144a is erected in a direction parallel to the material axis direction of the first steel pipe column 102 and is provided so as to be in contact with at least the insides of the first flange 106a and the first flange 106b. The first reinforcing plate 144a may have a cross shape in a plan view so as to be inscribed in the third flange 108a and the third flange 108b. A second reinforcing plate 144b having a similar structure is provided on the second steel pipe column 112 side.

[0054] In addition, by providing the first reinforcing plate 144a and the second reinforcing plate 144b, the second support plates 140a and 140b interfere with the reinforcing plates. Therefore, in this embodiment, the second support plates 140a and 140b have a structure divided into two so that they do not overlap with the reinforcing plates.

[0055] 11 shows a front view of the joint structure of a steel pipe pole according to this embodiment. On the side of the first steel pipe pole 102, a first reinforcing plate 144a is provided at the same height as the portion where the first through hole 120 (and the third through hole 124, not shown) is provided. On the side of the second steel pipe pole 112, a second reinforcing plate 144b is provided at the same height as the portion where the second through hole 122 and the fourth through hole 126 are provided.

[0056] The first reinforcing plate 144a is disposed so that one end abuts against the position where the first through hole 120 of the first flange 106a is provided (the same applies to the first flange 106a not shown). In addition, when the first reinforcing plate 144a has a cross shape, it is provided so as to abut also against the third flanges 108a and 108b. The second reinforcing plate 144b is provided so that one end abuts against the position where the second through hole 122 of the second flange 116a is provided, and the other end abuts against the position where the fourth through hole 126 of the second flange 116b is provided. In addition, when the second reinforcing plate 144b has a cross shape, it is provided so as to abut also against the fourth flanges 118a and 118b. The first reinforcing plate 144a and the second reinforcing plate 144b are fixed to the respective flanges that they abut against by welding.

[0057] In this way, by providing the first reinforcing plate 144a so as to bridge the positions where the through holes of the first flanges 106a, 106b are provided, the strength of the positions can be increased. That is, the strength of the positions where the first through holes 120 and the third through holes 124 are provided in the first flanges 106a, 106b can be supplemented. Similarly, by providing the second reinforcing plate 144b so as to bridge the positions where the through holes of the second flanges 116a, 116b are provided, the strength of the positions can be increased.

[0058] The first reinforcing plate 144a may have a notch 146a at a position overlapping the first through hole 120 (and the third through hole 124, not shown), and the second reinforcing plate 144b may have a notch 146b at a position overlapping the second through hole 122 and the fourth through hole 126. The notch 146a and 146b may have any shape, and may have a semicircular shape having a diameter substantially the same as that of each through hole, for example. By providing the notch 146a and 146b in the first reinforcing plate 144a and the second reinforcing plate 144b, it is possible to prevent a part of each through hole from being blocked. As a result, even when a tool or the like is inserted through each through hole to perform work, the reinforcing plate does not get in the way, and workability is not reduced.

[0059] 12(A) shows the cross-sectional structure of the area sandwiched between arrows A5 and A6 in FIG. 11, and FIG. 12(B) shows the cross-sectional structure of the area sandwiched between arrows B5 and B6 in FIG.

[0060] As shown in FIG. 12(A), a first reinforcing plate 144a is provided so as to bridge the inner side surface of the first flange 106a to the inner side surface of the first flange 106b. When the first reinforcing plate 144a has a cross shape in a plan view as shown in the figure, the first reinforcing plate 144a is provided so as to bridge the inner side surface of the third flange 108a to the inner side surface of the third flange 108b. The first reinforcing plate 144a is provided at a position overlapping the first through hole 120 and the third through hole 124. A notch portion 146a is provided at an end of the first reinforcing plate 144a so as not to block a part of the through hole. A second reinforcing plate 144b shown in FIG. 12(B) has a similar configuration, and a second notch portion 146b is provided at an end overlapping the second through hole 122 and the fourth through hole 126.

[0061] As shown in Figures 12(A) and (B), by providing a reinforcing plate at the portion where the flange is provided, the strength of that portion can be increased. In particular, when a through hole is provided in the flange, by providing a reinforcing plate, the reduction in strength (rigidity) caused by providing the through hole can be compensated for. The other configurations of the steel pipe column according to this embodiment are the same as those according to the first embodiment, and the same effects can be achieved. This embodiment can be implemented in appropriate combination with the configurations of the second to third embodiments.

[0062] [Fifth embodiment] In this embodiment, a splice plate that connects the reinforcing plates to each other is further provided in the configuration of the reinforcing plate shown in the fourth embodiment. The following description will focus on the differences from the fourth embodiment.

[0063] Fig. 13(A) shows a development view of a joint portion in a joint structure of a steel pipe pole according to this embodiment, and Fig. 13(B) shows a perspective view of the joint structure of a steel pipe pole according to this embodiment. Note that in Fig. 13(A), fastening members such as bolts and nuts are omitted.

[0064] As shown in FIG. 13(A), the third splice plate 132 and the fourth splice plate 142 are arranged in accordance with the positions of the first auxiliary plate 144a and the second auxiliary plate 144b. The third splice plate 132 is arranged on one side of the first auxiliary plate 144a and the second auxiliary plate 144b, and the fourth splice plate 142 is arranged on the other side. The first reinforcing plate 144a and the second reinforcing plate 144b and the third splice plate 132 and the fourth splice plate 142 are provided with bolt holes for bolting. The third splice plate 132 and the fourth splice plate 142 have a length that spans both the first reinforcing plate 144a and the second reinforcing plate 144b. FIG. 13(B) shows a state in which the first steel pipe column 102 and the second steel pipe column 112 are connected by bolting. The third splice plate 132 and the fourth splice plate 142 are disposed inside the flange and are therefore visible from the through-holes, but otherwise have a structure that is not visible from the outside.

[0065] Cross-sectional structures corresponding to lines D3 and D4 shown in Fig. 130(B) are shown in Fig. 14(A) and (B), respectively. Fig. 14(A) shows the structure on the first steel pipe column 102 side, and Fig. 14(B) shows the structure on the second steel pipe column 112 side. The first reinforcing plate 144a and the second reinforcing plate 144b are sandwiched between the third splice plate 132 and the fourth splice plate 142 and bolted. When the first reinforcing plate 144a and the second reinforcing plate 144b have a cross shape in a plan view, splices can be provided corresponding to each face and fixed by bolting.

[0066] As shown in this embodiment, the strength of the joint structure of the steel pipe column can be increased by attaching a splice plate to the reinforcing plates arranged above and below and fixing them with fasteners such as bolts and nuts. In this case, since a through hole is provided in the flange surrounding the reinforcing plate, the work of connecting the reinforcing plate with the splice plate can be easily performed.

[0067] [Sixth embodiment] This embodiment shows an aspect in which the configuration of the flange is different from that of the first embodiment. The following will mainly describe the parts that are different from the first embodiment.

[0068] Fig. 15(A) shows a development view of the joint part of the steel pipe pole according to this embodiment, and Fig. 15(B) shows a perspective view of the joint part of the steel pipe pole. Also, Figs. 16(A) and (B) show cross-sectional structures corresponding to the lines D5 and D6 shown in Fig. 15(B), respectively. Note that fasteners such as bolts and nuts are omitted in Fig. 15(A). The following description will be made with reference to Figs. 15(A) and (B) and Figs. 16(A) and (B).

[0069] In this embodiment, the first flange 106a in which the first through hole 120 is provided has a plate thickness greater than the wall thickness of the first steel pipe column 102, and the second flange 116a in which the second through hole 122 is provided has a plate thickness greater than the wall thickness of the second steel pipe column 112. In this way, by making the plate thickness of the flange in which the through hole is provided greater than the wall thickness of the steel pipe column, it is possible to compensate for the reduction in strength (rigidity) against shear force, bending stress, and axial stress caused by the provision of the through hole and the provision of the bolt hole.

[0070] The plate thickness of the third flange 108a is relatively thin compared to the plate thickness of the second flange 116a. A spacer 134b is provided on the back surface of the third flange 108a to prevent a gap from being generated due to the difference in plate thickness when the second flange 116a and the third flange 108a are sandwiched between the first splice plate 130b and the second splice plate 140b. The spacer 134b has a thickness approximately equal to the difference in plate thickness between the second flange 116a and the third flange 108a, and is provided with bolt holes, so that the spacer 134b can be sandwiched between the third flange 108a and the fourth splice plate 140b to form a bolt joint so as to prevent a gap from being generated. As shown in Figures 16(A) and (B), a spacer is provided at each bolt joint (spacer 134a is disposed at the first bolt joint 100a, spacer 134b is disposed at the second bolt joint 100b, spacer 134c is disposed at the third bolt joint 100c, and spacer 134d is disposed at the fourth bolt joint 100d).

[0071] In addition, for the third flange 108 and the fourth flange 118, which do not have through holes, the reduction in strength (rigidity) against shear force, bending stress, and axial stress caused by the provision of bolt holes can be compensated for by increasing the plate thickness in a similar manner.

[0072] The joint structure of the steel pipe pole according to this embodiment is the same as that of the first embodiment, except that the thickness of the flange is increased. Therefore, in addition to the above-mentioned effects, the same advantageous effects as those of the first embodiment can be obtained. Note that this embodiment can be implemented in appropriate combination with the second to fifth embodiments.

[0073] [Seventh embodiment] This embodiment shows an embodiment in which the configuration of the diaphragm is different from that of the first embodiment. The following description will focus on the differences from the first embodiment.

[0074] 17(A) and (B) are drawings corresponding to FIG. 3(A) and (B), and show the cross-sectional structure of a bolt joint of a square steel pipe column. In this embodiment, a through hole 148a is provided in the first diaphragm 104, and a through hole 148b is provided in the second diaphragm 114. The size and shape in a plan view of the through hole 148a and the through hole 148b are arbitrary. In this way, by providing a through hole in one or both of the first diaphragm 104 and the second diaphragm 114, it is possible to reduce the weight while maintaining the strength of the joint portion.

[0075] Moreover, the square steel pipe column shown in this embodiment can be applied to a concrete filled steel pipe structure (also called a Concrete Filled Steel Tube, CFT). Concrete is filled inside the first steel pipe column 102 and the second steel pipe column 112 that are connected together through the through holes 148a, 148b. As a result, even if the cross-sectional areas of the first steel pipe column 102 and the second steel pipe column 112 are reduced, a strong structure can be formed.

[0076] The joint structure of the steel pipe column according to this embodiment is the same as that of the first embodiment except for the structure of the diaphragm. Therefore, in addition to the above-mentioned effects, the same advantageous effects as those of the first embodiment can be obtained. Note that this embodiment can be implemented in appropriate combination with the second to sixth embodiments. [Explanation of symbols]

[0077] 100 bolt joint, 102 first steel pipe column, 104 first diaphragm, 106 first flange, 108 third flange, 112 second steel pipe column, 114 second diaphragm, 116 second flange, 118 fourth flange, 110 bolt hole, 111 bolt hole, 120 first through hole, 122 second through hole, 124 third through hole, 126 fourth through hole, 130 first splice plate, 132 third splice plate, 134 spacer, 140 second splice plate, 142 fourth splice plate, 144 reinforcing plate, 146 notch, 148 through hole, 150 bolt, 152 nut

Claims

1. A first diaphragm provided at one end of a first steel pipe column, a first flange fixed to the first diaphragm, and a third flange fixed to the first diaphragm; A second diaphragm provided at one end of a second steel pipe column, a second flange fixed to the second diaphragm, and a fourth flange fixed to the second diaphragm; A first splice; A second splice; Including, The first steel pipe pole and the second steel pipe pole are arranged vertically along the material axis direction, the first flange and the second flange are bolted together with the first splice plate; the third flange and the fourth flange are bolted together with the second splice plate, a first through hole that can be used as a hand hole is provided in one of the first flange and the second flange; A second through hole that can be used as a hand hole is provided in one of the third flange and the fourth flange. Steel pipe column joint structure.

2. The first flange is arranged parallel to the material axis direction of the first steel pipe column, and the second flange is arranged parallel to the material axis direction of the second steel pipe column, A joint structure for a steel pipe column according to claim 1.

3. The third flange is arranged parallel to the material axis direction of the first steel pipe column, and the fourth flange is arranged parallel to the material axis direction of the second steel pipe column. A joint structure for a steel pipe column according to claim 1.

4. the first through hole is provided in the first flange, the second through hole is provided in the fourth flange, and the first through hole and the second through hole have different heights in the material axis direction; A joint structure for a steel pipe column according to claim 1.

5. the first through hole is provided in the first flange, the second through hole is provided in the third flange, and the first through hole and the second through hole have the same height in the material axis direction. A joint structure for a steel pipe column according to claim 1.

6. the first flange has a first region in which a plurality of bolt holes are provided, and a first through hole is provided between one end fixed to the first diaphragm and the first region; the fourth flange has a second region in which a plurality of bolt holes are provided, and the second through hole is provided between one end fixed to the second diaphragm and the second region; The first flange and the fourth flange are disposed on adjacent surfaces. A joint structure for a steel pipe column according to claim 1.

7. the first flange has a first region in which a plurality of bolt holes are provided, and the first through hole is provided between one end fixed to the first diaphragm and the first region; the third flange has a third region in which a plurality of bolt holes are provided, and the second through hole is provided between one end fixed to the first diaphragm and the third region; The first flange and the third flange are disposed on adjacent surfaces. A joint structure for a steel pipe column according to claim 1.

8. In the first flange and the second flange, one flange in which the first through hole is provided has a plate thickness larger than that of the other flange in which the first through hole is not provided, A first spacer is provided on the other flange in which the first through hole is not provided so as to overlap the bolted region. A joint structure for a steel pipe column according to claim 1.

9. In the third flange and the fourth flange, one flange in which the second through hole is provided has a plate thickness larger than that of the other flange in which the second through hole is not provided, A second spacer is provided on the other flange in which the second through hole is not provided so as to overlap the bolted region. A joint structure for a steel pipe column according to claim 1.

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