Joining method of steel pipe column, and steel pipe column

Abstract

To provide a joining method of a steel pipe column that can easily fix a steel pipe column and a slab to each other, and a steel pipe column.SOLUTION: A joining method of steel pipe columns comprises the steps of: fixing one end of a first steel pipe column 10 to a slab 53; inserting a second steel pipe column 20 between a slab 51 and the first steel pipe column 10 along the horizontal direction D2; and joining the first steel pipe column 10 and the second steel pipe column 20 to each other by welding. A first joining portion 11 has a first inclined surface 13 and a first backing metal 14 protruding from the first inclined surface 13 toward a second joining portion 21. The second joining portion 21 has a second inclined surface 23 and a second backing metal 24 protruding from the second inclined surface 23 toward the first joining portion 11. During the insertion process, the second backing metal 24 faces a first inner peripheral surface 12 and the first backing metal 14 faces a second inner peripheral surface 22. The first backing metal 14 and the second backing metal 24 are arranged so as to form an annular portion when viewed along the vertical direction D1.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to a joining method for a steel pipe pole and a steel pipe pole. [Background technology]

[0002] Patent Document 1 discloses an underground structure equipped with a center column member that connects beam members arranged in an underground space. The center column member of this underground structure includes a center column body made of reinforced concrete and a set of bearing plates arranged at both ends of the center column body. The bearing plates are each fixed to the beam members. The center column body is supported by the bearing plates. A plurality of reinforcing bars are arranged along the longitudinal direction of the center column body between the set of bearing plates. A bundling structure is provided at the ends of the plurality of reinforcing bars to increase the lateral bundling force of the reinforcing bars. The bundling structure is formed by converging the ends of the plurality of reinforcing bars at a position within the bearing plate that corresponds to the center of the cross section of the center column body. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 5827158 Summary of the Invention [Problem to be solved by the invention]

[0004] When installing a steel pipe pole between a pair of vertically aligned slabs, sheath pipes are embedded in the pair of upper and lower slabs in advance, and the steel pipe pole is placed between the pair of upper and lower sheath pipes. Then, anchors are inserted into the upper and lower ends of the steel pipe pole and into the sheath pipes, respectively, and the sheath pipes are then filled with mortar to install the steel pipe pole in the pair of upper and lower slabs. However, because the slabs are sometimes densely packed with reinforcing bars, it can be difficult to easily place the sheath pipes in the slab. Furthermore, after installing the steel pipe pole, it can be difficult to fill the lower sheath pipe with mortar. As such, the process of fixing the steel pipe pole to the slab can be difficult.

[0005] The present disclosure aims to provide a steel pipe column joining method and a steel pipe column that can easily fix a steel pipe column and a slab to each other. [Means for solving the problem]

[0006] The method for joining steel pipe poles according to the present disclosure is (1) a method for joining a first steel pipe pole and a second steel pipe pole to each other between two slabs arranged vertically. This method for joining steel pipe poles includes the steps of fixing one end of the first steel pipe pole to one of the two slabs, inserting a second steel pipe pole horizontally between the other of the two slabs and the first steel pipe pole, and joining the first steel pipe pole and the second steel pipe pole to each other by welding. The first steel pipe pole has a first joint portion joined to the second steel pipe pole. The second steel pipe pole has a second joint portion joined to the first joint portion of the first steel pipe pole. The first joint portion has a first inclined surface inclined with respect to the horizontal direction and a first backing metal fixed to a first inner circumferential surface of the first steel pipe pole and protruding from the first inclined surface toward the second joint portion. The second joint has a second inclined surface inclined with respect to the horizontal direction, and a second backing metal fixed to the second inner peripheral surface of the second steel pipe column and protruding from the second inclined surface toward the first joint. In the inserting step, the second backing metal faces the first inner peripheral surface, and the first backing metal faces the second inner peripheral surface, and the first and second backing metals are arranged to form an annular portion when viewed along the vertical direction.

[0007] In this steel pipe column joining method, one end of a first steel pipe column is fixed to one of two slabs, and then a second steel pipe column is inserted between the other of the two slabs and the first steel pipe column. By fixing the first steel pipe column to the slab before inserting the second steel pipe column, it is possible to eliminate the need to arrange a sheath pipe in the slab to which the first steel pipe column is to be fixed. This reduces the work of arranging the sheath pipe in the slab and filling the sheath pipe with mortar, making it easier to secure the steel pipe column and the slab together. In this joining method, the first backing plate faces the second inner circumferential surface of the second steel pipe column, and the second backing plate faces the first inner circumferential surface of the first steel pipe column. When the second steel pipe column is inserted horizontally between the slab and the first steel pipe column, the first backing plate and the second backing plate are arranged to form an annular portion in a vertical view. The first inclined surface of the first steel pipe column and the second inclined surface of the second steel pipe column are inclined relative to the horizontal direction. This reduces the possibility of the second backing plate colliding with the first backing plate when the second steel pipe column is inserted horizontally toward the first steel pipe column fixed to one of the two slabs, making it easier to insert the second steel pipe column between the slab and the first steel pipe column.

[0008] (2) In the above (1), in the inserting step, the first backing plate and the second backing plate may be arranged so that, when viewed vertically, each forms half of the annular portion. In this case, when the second steel pipe pole is inserted, the first backing plate forms one half of the annular portion, and the second backing plate forms the other half of the annular portion. This further reduces the possibility of the second backing plate colliding with the first backing plate when the second steel pipe pole is inserted horizontally toward the first steel pipe pole fixed to one of two slabs, making it easier to insert the second steel pipe pole between the other slab and the first steel pipe pole. This makes it easier to fix the steel pipe pole and the slab to each other.

[0009] (3) In the above (1) or (2), the method for joining steel pipe columns may include a step of fixing one end of a third steel pipe column to the other of the two slabs. In this case, in the step of inserting a second steel pipe column, the second steel pipe column is inserted horizontally between the first steel pipe column and the third steel pipe column. In the joining step, the third steel pipe column and the second steel pipe column are joined to each other by welding. The second steel pipe column is located on the opposite side of the first steel pipe column and has a fourth joint portion joined to the third steel pipe column. The third steel pipe column has a third joint portion joined to the fourth joint portion. The third joint portion has a third inclined surface inclined with respect to the horizontal direction and a third backing metal fixed to a third inner peripheral surface of the third steel pipe column and protruding from the third inclined surface toward the fourth joint portion. The fourth joint portion has a fourth inclined surface inclined with respect to the horizontal direction and a fourth backing metal fixed to the second inner peripheral surface and protruding from the fourth inclined surface toward the third joint portion. In the insertion process, the fourth backing plate faces the third inner peripheral surface and the third backing plate faces the second inner peripheral surface, and the third backing plate and the fourth backing plate are arranged so as to form an annular portion when viewed vertically.

[0010] In this case, one end of a first steel pipe column is fixed to one of the two slabs, and one end of a third steel pipe column is fixed to the other of the two slabs. Then, a second steel pipe column is inserted between the first and third steel pipe columns. By fixing the first steel pipe column to one slab and the third steel pipe column to the other slab before inserting the second steel pipe column, it is possible to eliminate the need to place sheath pipes in the slab to which the first steel pipe column is fixed and the slab to which the third steel pipe column is fixed. This eliminates the need to place sheath pipes in the slab and fill the sheath pipes with mortar, making it even easier to install the steel pipe columns in the slabs.

[0011] The steel pipe pole according to the present disclosure is (4) a steel pipe pole including a first steel pipe pole and a second steel pipe pole joined to each other between two slabs arranged vertically. This steel pipe pole has one end of the first steel pipe pole fixed to one of the two slabs. The first steel pipe pole has a first joint portion joined to the second steel pipe pole. The second steel pipe pole has a second joint portion joined to the first joint portion of the first steel pipe pole. The first joint portion has a first inclined surface inclined with respect to the horizontal direction and a first backing metal fixed to a first inner circumferential surface of the first steel pipe pole and protruding from the first inclined surface toward the second joint portion. The second joint portion has a second inclined surface inclined with respect to the horizontal direction and a second backing metal fixed to a second inner circumferential surface of the second steel pipe pole and protruding from the second inclined surface toward the first joint portion. The second backing plate faces the first inner peripheral surface and the first backing plate faces the second inner peripheral surface, and the first backing plate and the second backing plate form an annular portion when viewed vertically.

[0012] This steel pipe column includes a first steel pipe column and a second steel pipe column, with one end of the first steel pipe column fixed to one of two slabs. The second steel pipe column is then inserted between the other of the two slabs and the first steel pipe column. Therefore, since the first steel pipe column can be fixed to the slab before the second steel pipe column is inserted, similar to the above-described steel pipe column joining method, it is not necessary to arrange a sheath pipe in the slab to which the first steel pipe column is fixed. As a result, the work of arranging the sheath pipe in the slab and filling the sheath pipe with mortar can be reduced, making it easier to fix the steel pipe column and the slab to each other. Furthermore, in this steel pipe column, the first backing plate and the second backing plate are arranged to form an annular portion when viewed vertically. This reduces the possibility of the second backing plate colliding with the first backing plate when the second steel pipe column is inserted horizontally toward the first steel pipe column fixed to one of the two slabs, similar to the method of joining steel pipe columns described above, making it easier to insert the second steel pipe column between the slab and the first steel pipe column. [Effects of the Invention]

[0013] According to the present disclosure, it is possible to easily fix a steel pipe column and a slab to each other. [Brief explanation of the drawings]

[0014] [Figure 1] FIG. 2 is a cross-sectional view showing a part of a steel pipe column and a slab according to the first embodiment. [Figure 2] FIG. 1 is a partial perspective view schematically showing a steel pipe pole according to a first embodiment. [Figure 3] FIG. 2 is a partial side view schematically showing the steel pipe pole according to the first embodiment. [Figure 4] FIG. 10 is a cross-sectional view showing a part of a steel pipe column and a slab according to a second embodiment. [Figure 5] FIG. 10 is a partial side view schematically showing a steel pipe pole according to a second embodiment. [Figure 6] FIG. 10 is a cross-sectional view showing a part of a steel pipe column and a slab according to a comparative example. DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, a method for joining steel pipe poles and an embodiment of a steel pipe pole according to the present disclosure will be described with reference to the drawings. In the description of the drawings, identical or corresponding elements are designated by the same reference numerals, and duplicate explanations will be omitted as appropriate. The drawings may be partially simplified or exaggerated for ease of understanding, and the dimensional ratios and the like are not limited to those shown in the drawings.

[0016] (First embodiment) Fig. 1 is a cross-sectional view showing a steel pipe pole 1 and a part of slabs 51, 53 according to the first embodiment. Fig. 2 is a partial perspective view schematically showing the steel pipe pole 1 according to the first embodiment. Fig. 3 is a partial side view showing the steel pipe pole 1 according to the first embodiment. Note that in Fig. 2, concrete C is omitted from the illustration to avoid complexity.

[0017] The slab 51 and the slab 53 face each other in the vertical direction D1. In FIG. 1 , the slab 51 is disposed, for example, higher than the slab 53 in the vertical direction D1. In this embodiment, the slabs 51 and 53 constitute, for example, floor slabs. The slabs 51 and 53 are constructed, for example, in an underground space including a subway station. This underground space is formed, for example, by a reverse winding method. The steel pipe column 1 is installed between the pair of slabs 51 and 53 that are arranged vertically.

[0018] A haunch 56 is formed in a part of the lower part of the slab 51. A beam 58, for example, is formed below the haunch 56. The beam 58 extends, for example, in a direction perpendicular to the plane of the paper. However, the beam 58 may also extend, for example, in a direction transverse to the plane of the paper.

[0019] An anchor 54 is installed on the haunch 56. The anchor 54 has a rod shape extending along the vertical direction D1. The anchor 54 is embedded in the haunch 56 (slab 51). The tip of the anchor 54 protrudes downward from the slab 51 in the vertical direction D1. A plurality of anchors 54 are installed on the slab 51. The anchors 54 are lined up along the horizontal direction D2. The diameter of the anchor 54 is, for example, 32 mm.

[0020] A haunch 57 is formed in a part of the lower part of the slab 53. An anchor 55 is installed in the haunch 57 (slab 53). The anchor 55 is rod-shaped along the vertical direction D1. The anchor 55 is embedded in the slab 53. The tip of the anchor 55 protrudes upward in the vertical direction D1 from the slab 53. The size, number and arrangement of the anchors 55 in the slab 53 are similar to, for example, the size, number and arrangement of the anchors 54 in the slab 51. For example, a beam 59 similar to the beam 58 is formed below the haunch 57.

[0021] The slab 51 is produced by pouring concrete C into a formwork in which a plurality of reinforcing bars and anchors 54 are arranged. The slab 53, like the slab 51, is produced by pouring concrete C into a formwork in which a plurality of reinforcing bars and anchors 55 are arranged.

[0022] Because the haunches 56, 57 are important locations for ensuring the strength of the structure, the aforementioned reinforcing bars may be densely arranged in the haunches 56, 57. As described above, the diameter of the anchors 54, 55 is, for example, 32 mm. Therefore, even when the reinforcing bars are densely arranged, the anchors 54, 55 are easy to install between multiple reinforcing bars. However, when the reinforcing bars are densely arranged, it may be difficult to install a sheath tube with a diameter larger than that of the reinforcing bars. In this embodiment, the structure and joining method of the steel pipe column 1 described below eliminate the need to install a sheath tube.

[0023] The steel pipe column 1 includes a first steel pipe column 10, a second steel pipe column 20, and a third steel pipe column 30 that are joined to each other between slabs 51, 53 that are lined up along the vertical direction D1. The first steel pipe column 10, the second steel pipe column 20, and the third steel pipe column 30 are lined up in this order from above to below in the vertical direction D1.

[0024] Moreover, the steel pipe pole 1 contains concrete C. The concrete C is filled inside the steel pipe pole 1. A cross section of the steel pipe pole 1 perpendicular to the vertical direction D1 has, for example, a circular shape. The steel pipe pole 1 has, for example, a steel pipe and concrete C filled inside the steel pipe.

[0025] The first steel pipe column 10 has a flange 15 located at the upper part in the vertical direction D1. The flange 15 functions as a bearing plate. The flange 15 (one end) of the first steel pipe column 10 is fixed to a slab 51, which is one of the two slabs. The outer diameter of the flange 15 is larger than the outer diameter of the part of the first steel pipe column 10 other than the flange 15. The outer diameter of the flange 15 increases upward in the vertical direction D1. A through hole 16 is formed in the flange 15. The through hole 16 penetrates the flange 15 in the vertical direction D1.

[0026] A plurality of through holes 16 are formed in the flange 15. Anchors 54 are inserted into the through holes 16. At this time, the anchors 54 penetrate the flange 15. The tips of the anchors 54 protrude from the flange 15. The anchors 54 are inserted into the through holes 16, and nuts are fastened to the anchors 54 at the bottom of the flange 15. In this way, the flange 15 (first steel pipe column 10) is attached to the slab 51.

[0027] The first steel pipe column 10 has a first joint portion 11 joined to the second steel pipe column 20. The first joint portion 11 has a first inclined surface 13 and a first backing metal 14. The first inclined surface 13 is an annular surface facing the second steel pipe column 20. For example, the first inclined surface 13 has an elliptical shape. The first inclined surface 13 is inclined with respect to the horizontal direction D2. The length of the first steel pipe column 10 in the vertical direction D1 becomes shorter toward one side of the horizontal direction D2. The first inclined surface 13 is inclined with respect to the horizontal direction D2, for example, by 30° or more and 45° or less. However, the inclination angle of the first inclined surface 13 with respect to the horizontal direction D2 is not particularly limited.

[0028] The first backing metal 14 has a plate shape. The first backing metal 14 is fixed to the first inner peripheral surface 12 of the first steel pipe pole 10. Specifically, the first backing metal 14 is fixed to one side of the first steel pipe pole 10 in the circumferential direction of the first inner peripheral surface 12. The "circumferential direction" refers to a direction along a ring centered on the axis of the steel pipe pole. As an example, the first backing metal 14 is fixed to one half of the first inner peripheral surface 12 in the circumferential direction. For example, the first backing metal 14 is adjacent to the upper half of the first inclined surface 13. Note that a part of the first backing metal 14 (for example, the upper half) is embedded in the concrete C.

[0029] An upper half of the first backing metal 14 is fixed to, for example, the first inner peripheral surface 12. The first backing metal 14 protrudes from the first inclined surface 13 toward a second joint portion 21, which will be described in detail later. Specifically, a lower half of the first backing metal 14 in the vertical direction D1 protrudes from the first inclined surface 13 toward the second joint portion 21.

[0030] In the vertical direction D1, the length of the protruding portion of the first backing metal 14 is, for example, the same as the length of the fixed portion of the first backing metal 14. However, in the vertical direction D1, the length of the protruding portion of the first backing metal 14 may be longer or shorter than the length of the fixed portion of the first backing metal 14. For example, both ends of the first backing metal 14 extend along the horizontal direction D2. The material of the first backing metal 14 is, for example, the same as the material of the steel pipe of the first steel pipe column 10, which is a metal such as iron.

[0031] The second steel pipe column 20 has a second joint portion 21 joined to the first joint portion 11 of the first steel pipe column 10. The second joint portion 21 is joined to the first joint portion 11 by, for example, welding. The second joint portion 21 has a second inclined surface 23 and a second backing metal 24. The second inclined surface 23 is an annular (e.g., elliptical) surface facing the first steel pipe column 10.

[0032] The second inclined surface 23 is inclined with respect to the horizontal direction D2. The second inclined surface 23 is inclined to the same side as the first inclined surface 13. In the joined steel pipe column 1, the length in the vertical direction D1 from the upper surface of the slab 53 to the second inclined surface 23 increases toward one side of the horizontal direction D2. The second inclined surface 23 is inclined, for example, by 30° or more and 45° or less with respect to the horizontal direction D2. However, the inclination angle of the second inclined surface 23 with respect to the horizontal plane is not particularly limited. The inclination angle of the second inclined surface 23 with respect to the horizontal plane is the same as the inclination angle of the first inclined surface 13 with respect to the horizontal plane. The "inclination angle" is the angle of the inclined surface with respect to the horizontal direction D2.

[0033] The second backing metal 24 has a plate shape. The second backing metal 24 is fixed to the second inner circumferential surface 22 of the second steel pipe pole 20. Specifically, the second backing metal 24 is fixed to one side of the second inner circumferential surface 22 in the circumferential direction of the second steel pipe pole 20 (the side opposite to the first backing metal 14). The second backing metal 24 is fixed to a portion of the second inner circumferential surface 22 opposite to the first backing metal 14 when viewed along the axis of the steel pipe pole 1. As an example, the second backing metal 24 is fixed to the half of the second inner circumferential surface 22 opposite to the first backing metal 14 in the circumferential direction. For example, the second backing metal 24 is adjacent to the lower half of the second inclined surface 23. Note that a part of the second backing metal 24 (for example, the lower half) is embedded in the concrete C.

[0034] A lower half of the second backing metal 24 is fixed to, for example, the second inner circumferential surface 22. The second backing metal 24 protrudes from the second inclined surface 23 toward the first joint 11. Specifically, an upper half of the second backing metal 24 in the vertical direction D1 protrudes from the second inclined surface 23 toward the first joint 11.

[0035] In the vertical direction D1, the length of the protruding portion of the second backing plate 24 is, for example, the same as the length of the fixed portion of the second backing plate 24. However, in the vertical direction D1, the length of the protruding portion of the second backing plate 24 may be longer or shorter than the length of the fixed portion of the second backing plate 24. For example, both ends of the second backing plate 24 extend along the horizontal direction D2. The material of the second backing plate 24 is, for example, the same as the material of the first backing plate 14.

[0036] When the second steel pipe pole 20 is joined to the first steel pipe pole 10, the second backing metal 24 faces the first inner circumferential surface 12, and the first backing metal 14 faces the second inner circumferential surface 22. As a result, when viewed along the vertical direction D1, the first backing metal 14 and the second backing metal 24 form an annular portion. The term "annular portion" refers to a portion that is annular. "Annular" includes not only a circular annular shape but also an oval annular shape, an elliptical annular shape, and a frame shape. In other words, the annular portion is not limited to a circular shape, and may have a polygonal shape such as an oval shape, an elliptical shape, or a square shape.

[0037] As described above, the first backing metal 14 is adjacent to the upper side of the first inclined surface 13. The second backing metal 24 is adjacent to the lower side of the second inclined surface 23. When the first joint portion 11 and the second joint portion 21 are joined together, both ends of the first backing metal 14 and both ends of the second backing metal 24 come into contact with each other, and the first backing metal 14 and the second backing metal 24 are arranged in a circular shape.

[0038] Thus, the "annular portion" is a portion formed by, for example, continuously arranging the first backing metal 14 and the second backing metal 24. However, the annular portion does not have to be circular as in this embodiment. As described above, for example, the annular portion may have a circular shape that includes corners, such as a frame shape.

[0039] In this embodiment, the first backing metal 14 and the second backing metal 24 are arranged so that each forms half of the annular portion when viewed along the vertical direction D1, thereby reducing the possibility that the second backing metal 24 will collide with the first backing metal 14.

[0040] The second steel pipe pole 20 has a fourth joint portion 41 joined to the third steel pipe pole 30. The fourth joint portion 41 is located on the opposite side of the second steel pipe pole 20 to the first steel pipe pole 10 (second joint portion 21). The fourth joint portion 41 has a fourth inclined surface 43 and a fourth backing metal 44. The fourth inclined surface 43 is an annular (e.g., elliptical) surface facing the third steel pipe pole 30.

[0041] The fourth inclined surface 43 is inclined with respect to the horizontal direction D2. For example, the fourth inclined surface 43 is inclined opposite to the second inclined surface 23. In this case, the second steel pipe column 20 has a trapezoidal shape in side view. The length of the second steel pipe column 20 (length in the vertical direction D1) becomes shorter going from one side to the other side in the horizontal direction D2. The fourth inclined surface 43 is inclined, for example, by 30° or more and 45° or less with respect to the horizontal direction D2. However, the inclination angle of the fourth inclined surface 43 with respect to the horizontal direction D2 is not particularly limited.

[0042] The fourth lining metal 44 has a plate shape. The fourth lining metal 44 is fixed to the second inner circumferential surface 22 of the second steel pipe pole 20. Specifically, the fourth lining metal 44 is fixed to one circumferential side of the second steel pipe pole 20 on the second inner circumferential surface 22 (the same side as the second lining metal 24). For example, the fourth lining metal 44 is fixed to a position on the second inner circumferential surface 22 that overlaps with the second lining metal 24 when viewed along the axis of the second steel pipe pole 20. As an example, the fourth lining metal 44 is fixed to a half of the second inner circumferential surface 22 on the same side as the second lining metal 24 in the circumferential direction. For example, the fourth lining metal 44 is adjacent to the upper half of the fourth inclined surface 43. Note that a part of the fourth lining metal 44 (for example, the upper half) is embedded in the concrete C.

[0043] An upper half of the fourth backing plate 44 is fixed to, for example, the second inner circumferential surface 22. The fourth backing plate 44 protrudes from the fourth inclined surface 43 toward the third joint portion 31, which will be described in detail later. Specifically, a lower half of the fourth backing plate 44 protrudes from the fourth inclined surface 43 toward the third joint portion 31.

[0044] In the vertical direction D1, the length of the protruding portion of the fourth backing plate 44 is, for example, the same as the length of the fixed portion of the fourth backing plate 44. However, in the vertical direction D1, the length of the protruding portion of the fourth backing plate 44 may be longer or shorter than the length of the fixed portion of the fourth backing plate 44. For example, both ends of the fourth backing plate 44 extend along the horizontal direction D2. The material of the fourth backing plate 44 is, for example, the same as the material of the steel pipe of the second steel pipe column 20, which is a metal such as iron.

[0045] The third steel pipe column 30 has a flange 35 located at the bottom in the vertical direction D1. The flange 35 functions as a bearing plate. The flange 35 of the third steel pipe column 30 is fixed to slab 53, the other of the two slabs. The outer diameter of the flange 35 as viewed from the vertical direction D1 is larger than the outer diameter of the portion of the third steel pipe column 30 other than the flange 35. The outer diameter of the flange 35 increases downward in the vertical direction D1. A through hole 36 is formed in the flange 35. The through hole 36 penetrates the flange 35 in the vertical direction D1.

[0046] A plurality of through holes 36 are formed in the flange 35. Anchors 55 are inserted into the through holes 36. At this time, the anchors 55 penetrate the flange 35. The tips of the anchors 55 protrude upward from the flange 35. The anchors 55 are inserted into the through holes 36, and nuts are fastened to the anchors 55 at the top of the flange 35. In this way, the flange 35 (third steel pipe column 30) is attached to the slab 53.

[0047] The third steel pipe column 30 has a third joint portion 31 joined to a fourth joint portion 41 of the second steel pipe column 20. The third joint portion 31 is joined to the fourth joint portion 41 by, for example, welding. The third joint portion 31 has a third inclined surface 33 and a third backing metal 34. The third inclined surface 33 is an annular (e.g., elliptical) surface facing the second steel pipe column 20.

[0048] The third inclined surface 33 is inclined with respect to the horizontal direction D2. The third inclined surface 33 is inclined to the same side as the fourth inclined surface 43. The length of the third steel pipe column 30 in the vertical direction D1 becomes shorter toward one side of the horizontal direction D2. The third inclined surface 33 is inclined, for example, by 30° or more and 45° or less with respect to the horizontal direction D2. However, the inclination angle of the third inclined surface 33 with respect to the horizontal plane is not particularly limited. The inclination angle of the third inclined surface 33 with respect to the horizontal plane is the same as the inclination angle of the fourth inclined surface 43 with respect to the horizontal plane.

[0049] The third backing metal 34 has a plate shape. The third backing metal 34 is fixed to the third inner circumferential surface 32 of the third steel pipe pole 30. Specifically, the third backing metal 34 is fixed to one circumferential side of the third inner circumferential surface 32 of the third steel pipe pole 30. As an example, the third backing metal 34 is fixed to one half of the third inner circumferential surface 32 on one circumferential side. For example, the third backing metal 34 is adjacent to the lower half of the third inclined surface 33. Note that a part of the third backing metal 34 (for example, the lower half) is embedded in the concrete C.

[0050] A lower half of the third backing metal 34 is fixed to, for example, the third inner circumferential surface 32. The third backing metal 34 protrudes from the third inclined surface 33 toward the fourth joint 41. Specifically, an upper half of the third backing metal 34 in the vertical direction D1 protrudes from the third inclined surface 33 toward the fourth joint 41.

[0051] In the vertical direction D1, the length of the protruding portion of the third backing plate 34 is, for example, the same as the length of the fixed portion of the third backing plate 34. However, in the vertical direction D1, the length of the protruding portion of the third backing plate 34 may be longer or shorter than the length of the fixed portion of the third backing plate 34. For example, both ends of the third backing plate 34 extend along the horizontal direction D2. The material of the third backing plate 34 is, for example, the same as the material of the fourth backing plate 44, which is a metal such as iron.

[0052] In a state in which the second steel pipe pole 20 is joined to the third steel pipe pole 30, the third backing metal 34 faces the second inner circumferential surface 22, and the fourth backing metal 44 faces the third inner circumferential surface 32. As a result, when viewed along the vertical direction D1, the third backing metal 34 and the fourth backing metal 44 form an annular portion.

[0053] As described above, the fourth backing plate 44 is adjacent to the upper side of the fourth inclined surface 43. The third backing plate 34 is adjacent to the lower side of the third inclined surface 33. When the third joint portion 31 and the fourth joint portion 41 are joined to each other, both ends of the third backing plate 34 and both ends of the fourth backing plate 44 come into contact with each other, and the third backing plate 34 and the fourth backing plate 44 are arranged in an annular shape.

[0054] In this embodiment, the third backing plate 34 and the fourth backing plate 44 are arranged so that each forms half of the annular portion when viewed in the vertical direction D1. This reduces the possibility that the fourth backing plate 44 will collide with the third backing plate 34.

[0055] Next, we will explain the joining method of steel pipe columns 1. The joining method of steel pipe columns 1 is a method of joining steel pipe columns 1 in which a first steel pipe column 10, a second steel pipe column 20, and a third steel pipe column 30 are joined to each other between slabs 51, 53 that are arranged along the vertical direction D1. Note that hereinafter, explanations that overlap with the above content will be omitted as appropriate.

[0056] First, the first steel pipe column 10 (flange 15) is fixed to one slab 51 of the two slabs (fixing process). Specifically, the first steel pipe column 10 is sling-loaded and lifted by a lifting machine such as a mini crawler crane. Then, the position of the anchor 54 installed in the slab 51 is aligned with the position of the through-hole 16 provided in the flange 15 of the first steel pipe column 10. After the position has been determined, the anchor 54 is inserted into the through-hole 16, and a nut is fastened to the anchor 54 protruding downward from the flange 15, thereby attaching the first steel pipe column 10 to the slab 51.

[0057] Next, the third steel pipe column 30 (flange 35) is fixed to the other slab 53 of the two slabs (fixing process). Specifically, the third steel pipe column 30 is sling-loaded and lifted up with a crane. Then, the position of the anchor 55 installed in the slab 53 is aligned with the position of the through-hole 36 provided in the flange 35 of the third steel pipe column 30. After the position has been determined, the anchor 55 is inserted into the through-hole 36 and a nut is fastened to the anchor 55 protruding upward from the flange 35, thereby attaching the third steel pipe column 30 to the slab 53.

[0058] Next, the second steel pipe pole 20 is sling-loaded and lifted up by a crane. After that, the second steel pipe pole 20 is inserted between the first steel pipe pole 10 and the third steel pipe pole 30 along the horizontal direction D2 (insertion process).

[0059] Next, the positions of the second steel pipe pole 20, the first steel pipe pole 10, and the third steel pipe pole 30 are aligned in the vertical direction and temporarily fastened together. Then, the first steel pipe pole 10 and the second steel pipe pole 20 are joined to each other by welding. The third steel pipe pole 30 and the second steel pipe pole 20 are joined to each other by welding (joining step).

[0060] By inserting the second steel pipe pole 20 between the first steel pipe pole 10 and the third steel pipe pole 30 along the horizontal direction D2, the second backing metal 24 faces the first inner circumferential surface 12, and the first backing metal 14 faces the second inner circumferential surface 22. When viewed along the vertical direction D1, the first backing metal 14 and the second backing metal 24 are arranged to form an annular portion. Similarly, the fourth backing metal 44 faces the third inner circumferential surface 32, and the third backing metal 34 faces the second inner circumferential surface 22. When viewed along the vertical direction D1, the third backing metal 34 and the fourth backing metal 44 are arranged to form an annular portion.

[0061] With the first lining metal 14 and the second lining metal 24 forming an annular portion, welding is performed through the gap formed between the first steel pipe pole 10 and the second steel pipe pole 20, so that the second lining metal 24 is joined to the first inner circumferential surface 12 and the first lining metal 14 is joined to the second inner circumferential surface 22. This completes the joining of the second steel pipe pole 20 to the first steel pipe pole 10. Similarly, with the third lining metal 34 and the fourth lining metal 44 forming an annular portion, welding is performed through the gap formed between the second steel pipe pole 20 and the third steel pipe pole 30, so that the third lining metal 34 is joined to the second inner circumferential surface 22 and the fourth lining metal 44 is joined to the third inner circumferential surface 32. This completes the joining of the second steel pipe pole 20 to the third steel pipe pole 30. Through the above-mentioned steps, a series of steps in the method for joining a steel pipe pole 1 between slabs 51, 53 is completed.

[0062] 6 is a cross-sectional view showing a steel pipe pole 1A according to a comparative example and a part of slabs 51, 53. Unlike the steel pipe pole 1, the steel pipe pole 1A does not include a first steel pipe pole 10, a second steel pipe pole 20, and a third steel pipe pole 30, but is composed of a single steel pipe pole.

[0063] The slab 51 is produced by pouring concrete into a formwork in which a plurality of reinforcing bars and sheath pipes 60 are arranged. The slab 53, like the slab 51, is produced by pouring concrete into a formwork in which a plurality of reinforcing bars and sheath pipes 60 are arranged.

[0064] When fixing the steel pipe column 1A to the slabs 51, 53, the position of the opening 16A of the flange 15A is aligned with the position of the opening of the sheath tube 60, and the position of the opening 36A of the flange 35A is aligned with the position of the opening of the sheath tube 60. Thereafter, an anchor 54 is inserted into the opening 16A and the sheath tube 60, and an anchor 55 is inserted into the opening 36A and the sheath tube 60. The inner diameter of the sheath tube 60 is, for example, 100 mm. Therefore, it may not be easy to arrange the sheath tube 60 in the slabs 51, 53.

[0065] The flange 15A of the steel pipe column 1A and the slab 51 are fixed to each other via anchors 54. Similarly, the flange 35A of the steel pipe column 1A and the slab 53 are fixed to each other via anchors 55. Mortar M is used for reinforcement in fixing the steel pipe column and the slab. The mortar M is filled into the entire sheath tube 60. Specifically, the mortar M is filled into the sheath tube 60 from the bottom surface to the top surface of the slab 51. The mortar M is filled into the slab 53 from the bottom surface of the sheath tube 60 to the top surface of the slab 53.

[0066] The sheath pipe 60 is buried in the slab 53 before the steel pipe column 1A is installed. Therefore, when the steel pipe column 1A is placed on the slab 53, the flange 35A of the steel pipe column 1A may block the opening of the sheath pipe 60. In this case, a problem may arise in that it is difficult to fill the sheath pipe 60 with mortar M in the slab 53 to which the lower part (flange 35A) of the steel pipe column 1A is fixed.

[0067] In this case, it may be necessary to press-fit an injection pipe with a small diameter into the gap formed between the slab 53 and the flange 35A, insert the injection pipe into the sheath pipe 60, and then inject mortar M into the sheath pipe 60. As described above, with the steel pipe column 1A in the comparative example, the process of fixing the steel pipe column 1A and the slab 53 to each other may not be easy.

[0068] Next, the joining method for steel pipe columns 1 according to this embodiment and the effects obtained from the steel pipe column 1 will be described in more detail. As shown in FIGS. 1 to 3 , in this embodiment, the flange 15 of the first steel pipe column 10 is fixed to the slab 51, and the flange 35 of the third steel pipe column 30 is fixed to the slab 53. Then, the second steel pipe column 20 is inserted between the first steel pipe column 10 and the third steel pipe column 30. By fixing the first steel pipe column 10 to the slab 51 and fixing the third steel pipe column 30 to the slab 53 before inserting the second steel pipe column 20, it is possible to eliminate the need to arrange sheath pipes 60 in the slab 51 to which the first steel pipe column 10 is fixed and in the slab 53 to which the third steel pipe column 30 is fixed. Therefore, it is possible to eliminate the need to arrange the sheath pipes 60 in the slabs 51, 53 and to fill the sheath pipes 60 with mortar M, and therefore the installation work of the steel pipe columns to the slabs 51, 53 can be easily performed.

[0069] Furthermore, when the second steel pipe pole 20 is inserted, the first backing metal 14 forms one half of the annular portion, and the second backing metal 24 forms the other half of the annular portion. This makes it possible to further reduce the possibility of the second backing metal 24 colliding with the first backing metal 14 when the second steel pipe pole 20 is inserted from the horizontal direction D2 toward the first steel pipe pole 10 fixed to the slab 51, and makes it easier to insert the second steel pipe pole 20 between the slab 53 and the first steel pipe pole 10. This makes it easier to fix the steel pipe pole and the slab to each other.

[0070] Furthermore, when the second steel pipe pole 20 is inserted, the third backing metal 34 forms one half of the annular portion, and the fourth backing metal 44 forms the other half of the annular portion. This further reduces the possibility of the fourth backing metal 44 colliding with the third backing metal 34 when the second steel pipe pole 20 is inserted from the horizontal direction D2 toward the third steel pipe pole 30 fixed to the slab 53, making it easier to insert the second steel pipe pole 20 between the first steel pipe pole 10 and the third steel pipe pole 30. This makes it easier to fix the steel pipe pole and the slab to each other.

[0071] The above describes embodiments of a steel pipe pole according to the present disclosure. However, the steel pipe pole according to the present disclosure is not limited to the content of the above-described embodiments, and may be modified within the scope of the gist described in the claims. In other words, the shape, size, material, number, and arrangement of each part of the steel pipe pole according to the present disclosure, as well as the content and order of the steps of the joining method for steel pipe poles, can be appropriately changed within the scope of the above gist.

[0072] For example, in the above-described embodiment, a steel pipe pole 1 has been described in which the first steel pipe pole 10, the second steel pipe pole 20, and the third steel pipe pole 30 are arranged in this order from above to below in the vertical direction D1. However, in the steel pipe pole 1, the first steel pipe pole 10, the second steel pipe pole 20, and the third steel pipe pole 30 may also be arranged in this order from below to above in the vertical direction D1. Even in this case, the same effects as those of the above-described embodiment can be obtained.

[0073] In the above-described embodiment, an example has been described in which the cross section of the steel pipe column 1 perpendicular to the vertical direction D1 has a circular shape. However, the cross section of the steel pipe column 1 perpendicular to the vertical direction D1 may have, for example, a rectangular shape. Even in this case, the same effects as those of the above-described embodiment can be obtained.

[0074] In the above-described embodiment, an example has been described in which the second inclined surface 23 is inclined to the same side as the first inclined surface 13, the fourth inclined surface 43 is inclined to the same side as the third inclined surface 33, and the fourth inclined surface 43 is inclined to the opposite side from the second inclined surface 23. However, the fourth inclined surface 43 may be inclined to the same side as the second inclined surface 23. In this way, the directions of inclination of the first inclined surface 13, the second inclined surface 23, the third inclined surface 33, and the fourth inclined surface 43 can be changed as appropriate.

[0075] In the above-described embodiment, an aspect has been described in which the steel pipe pole 1 includes a first steel pipe pole 10, a second steel pipe pole 20, and a third steel pipe pole 30. However, the steel pipe pole 1 may include, for example, a fourth steel pipe pole between the second steel pipe pole and the third steel pipe pole. In other words, the steel pipe pole 1 may include four or more steel pipe poles. Even in this case, the same effects as those of the above-described embodiment can be obtained.

[0076] (Variation) Fig. 4 is a cross-sectional view showing a steel pipe pole 1B according to a modified example and a part of slabs 51, 53. Fig. 5 is a partial side view showing a steel pipe pole 1B according to a modified example. The steel pipe pole 1B includes a first steel pipe pole 10 and a second steel pipe pole 20, but differs from the steel pipe pole 1 in that it does not include a third steel pipe pole 30. Hereinafter, explanations that overlap with the above content will be omitted as appropriate.

[0077] In this modified example, the first steel pipe pole 10 is provided below the second steel pipe pole 20 in the vertical direction D1. That is, in the steel pipe pole 1B, the up-down positions of the first steel pipe pole 10 and the second steel pipe pole 20 are reversed. A sheath pipe 60 is provided in a slab 51 to which the second steel pipe pole 20 located above in the vertical direction D1 is fixed. The second steel pipe pole 20 has a flange 25 located at an upper part in the vertical direction D1. A through hole 26 is formed in the flange 25. The aspects of the flange 25 and the through hole 26 are similar to the aspects of the flange 15 and the through hole 16 described above.

[0078] A joining method for a steel pipe column 1B in this embodiment will be described. Below, explanations that overlap with the joining method for a steel pipe column 1 described above will be omitted as appropriate. First, a lifting machine is used to lift up the first steel pipe column 10, and the first steel pipe column 10 is fixed to the slab 53. Specifically, after alignment is performed so that the through hole 16 of the flange 15 is located vertically above the anchor 55 protruding upward from the slab 53, the anchor 55 is inserted into the through hole 16, and a nut is fastened to the anchor 55 protruding upward from the flange 15, thereby fixing the first steel pipe column 10 to the slab 53.

[0079] Next, the second steel pipe column 20 is lifted using a lifting machine, and the second steel pipe column 20 is moved along the horizontal direction D2 to insert the second steel pipe column 20 between the first steel pipe column 10 and the slab 51. Then, after alignment is performed so that the through hole 26 is located directly below the sheath tube 60, an anchor 54 is inserted into the through hole 26 and the inside of the sheath tube 60, and mortar M is filled into the inside of the sheath tube 60. After this mortar M has hardened, the fixing of the second steel pipe column 20 to the slab 51 is completed.

[0080] When the second steel pipe pole 20 is inserted between the first steel pipe pole 10 and the slab 51, the second lining metal 24 faces the first inner circumferential surface 12, and the first lining metal 14 faces the second inner circumferential surface 22, forming an annular portion. In this state, welding is performed through the gap formed between the first steel pipe pole 10 and the second steel pipe pole 20, to join the second lining metal 24 to the first inner circumferential surface 12 and to join the first lining metal 14 to the second inner circumferential surface 22. This completes the joining of the second steel pipe pole 20 to the first steel pipe pole 10, and completes a series of steps in the joining method.

[0081] As described above, in the steel pipe pole 1B according to the second embodiment, the first lining metal 14 faces the second inner circumferential surface 22 of the second steel pipe pole 20, and the second lining metal 24 faces the first inner circumferential surface 12 of the first steel pipe pole 10. When the second steel pipe pole 20 is inserted between the slab 51 and the first steel pipe pole 10 along the horizontal direction D2, the first lining metal 14 and the second lining metal 24 are arranged to form an annular portion when viewed in the vertical direction. The first inclined surface 13 of the first steel pipe pole 10 and the second inclined surface 23 of the second steel pipe pole 20 are inclined with respect to the horizontal direction D2. This reduces the possibility of the second lining metal 24 colliding with the first lining metal 14 when the second steel pipe pole 20 is inserted from the horizontal direction D2 toward the first steel pipe pole 10 fixed to the slab 53, making it easier to insert the second steel pipe pole 20 between the slab 51 and the first steel pipe pole 10.

[0082] Moreover, in this modified example, a sheath pipe 60 is installed in a slab 51 located above the steel pipe column 1B in the vertical direction D1. The opening of the sheath pipe 60 is formed in the upper part of the slab 51 in the vertical direction D1 and is exposed from the slab 51. In this case, the opening of the sheath pipe 60 is not blocked by the flange 15. Therefore, mortar M can be filled into the sheath pipe 60 from above the slab 51 in the vertical direction D1. Therefore, filling of mortar M can be performed more easily compared to when the sheath pipe 60 is installed in a slab 53 located below the steel pipe column 1B in the vertical direction D1. [Explanation of symbols]

[0083] 1, 1A, 1B...steel pipe column, 10...first steel pipe column, 11...first joint portion, 12...first inner peripheral surface, 13...first inclined surface, 14...first backing plate, 20...second steel pipe column, 21...second joint portion, 22...second inner peripheral surface, 23...second inclined surface, 24...second backing plate, 30...third steel pipe column, 31...third joint portion, 32...third inner peripheral surface, 33...third inclined surface, 34...third backing plate, 1 5,25,35,15A,35A...flanges, 16,36,26...through holes, 41...fourth joint, 43...fourth inclined surface, 44...fourth backing plate, 51,53...slab, 54,55...anchors, 56,57...haunches, 58,59...beams, 60...sheath pipe, 16A,36A...openings, C...concrete, D1...vertical direction, D2...horizontal direction, M...mortar.

Claims

1. A steel pipe column joining method for joining a first steel pipe column and a second steel pipe column to each other between two slabs arranged along the vertical direction, Fixing one end of the first steel pipe column to one of the two slabs; Inserting the second steel pipe column horizontally between the other of the two slabs and the first steel pipe column; A step of joining the first steel pipe pole and the second steel pipe pole to each other by welding; Equipped with The first steel pipe pole has a first joint portion joined to the second steel pipe pole, The second steel pipe pole has a second joint portion joined to the first joint portion of the first steel pipe pole, The first joint portion has a first inclined surface inclined with respect to the horizontal direction, and a first backing metal fixed to a first inner circumferential surface of the first steel pipe column and protruding from the first inclined surface toward the second joint portion, The second joint portion has a second inclined surface inclined with respect to the horizontal direction, and a second backing metal fixed to a second inner circumferential surface of the second steel pipe column and protruding from the second inclined surface toward the first joint portion, In the inserting step, the second backing metal faces the first inner circumferential surface, and the first backing metal faces the second inner circumferential surface, and the first backing metal and the second backing metal are arranged to form an annular portion when viewed along a vertical direction. How to join steel pipe columns.

2. In the inserting step, the first backing metal and the second backing metal are arranged so as to form half of the annular portion when viewed in a vertical direction. The method for joining steel pipe columns according to claim 1.

3. and fixing one end of a third steel pipe column to the other of the two slabs. In the step of inserting the second steel pipe pole, the second steel pipe pole is inserted horizontally between the first steel pipe pole and the third steel pipe pole, In the joining step, the third steel pipe pole and the second steel pipe pole are joined to each other by welding, The second steel pipe pole has a fourth joint portion located on the opposite side from the first steel pipe pole and joined to the third steel pipe pole, The third steel pipe column has a third joint portion joined to the fourth joint portion, The third joint portion has a third inclined surface inclined with respect to the horizontal direction, and a third backing metal fixed to a third inner circumferential surface of the third steel pipe column and protruding from the third inclined surface toward the fourth joint portion, the fourth joint portion has a fourth inclined surface inclined with respect to a horizontal direction, and a fourth backing metal fixed to the second inner circumferential surface and protruding from the fourth inclined surface toward the third joint portion, In the inserting step, the fourth backing metal faces the third inner circumferential surface, and the third backing metal faces the second inner circumferential surface, and the third backing metal and the fourth backing metal are arranged to form an annular portion when viewed along a vertical direction. The method for joining steel pipe columns according to claim 1 or claim 2.

4. A steel pipe column including a first steel pipe column and a second steel pipe column joined to each other between two slabs arranged along a vertical direction, One end of the first steel pipe column is fixed to one of the two slabs, The first steel pipe pole has a first joint portion joined to the second steel pipe pole, The second steel pipe pole has a second joint portion joined to the first joint portion of the first steel pipe pole, The first joint portion has a first inclined surface inclined with respect to the horizontal direction, and a first backing metal fixed to a first inner circumferential surface of the first steel pipe column and protruding from the first inclined surface toward the second joint portion, The second joint portion has a second inclined surface inclined with respect to the horizontal direction, and a second backing metal fixed to a second inner circumferential surface of the second steel pipe column and protruding from the second inclined surface toward the first joint portion, the second backing metal faces the first inner peripheral surface, and the first backing metal faces the second inner peripheral surface, and the first backing metal and the second backing metal form an annular portion when viewed along a vertical direction. Steel pipe column.

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