JP6467088B1 - Steel pipe columns and convex members for welding joints of steel pipe columns - Google Patents

Abstract

An object of the present invention is to provide a steel pipe column and a steel pipe column capable of welding and supporting a bearing plate without using a backing metal at the end of the steel pipe, and easily increasing the rigidity and bearing strength of the column head and the column base. A convex member for welding joint is provided.
SOLUTION: It comprises a steel pipe 1 and a bearing plate 2 formed in a diameter larger than the diameter of the steel pipe 1 and installed at both upper and lower ends of the steel pipe 1. A plate-like or columnar convex portion 3 for welding joint that is inscribed in the inner periphery of the end portion of the steel pipe 1 is installed inside the bearing plate 2. A weld bead 5 is formed between the end of the steel pipe 1 and the bearing plate 2 so that the end of the steel pipe 1, the bearing plate 2, and the welding joint projection 3 are integrated. The weld bead 5 is formed continuously in the circumferential direction of the steel pipe 1. The support plate 2 is formed from a support plate.
[Selection] Figure 1

Description

  The present invention relates to a steel pipe column composed of one or a plurality of steel pipes and a bearing plate installed at the end of the steel pipe, and a convex member for welding joining of the steel pipe column for welding and joining the bearing plate to the end of the steel pipe. The bearing plate can be welded to the end of the steel pipe without using a backing metal, and the rigidity and bearing strength of the column head and / or column base of the steel pipe column can be easily increased. It is a thing.

  In general, steel pipe pillars that can reduce the diameter of the pillars are often used as pillars for supporting floor slabs in order to make effective use of the space in the subway station premises assuming that the user is congested.

  This type of steel pipe column is manufactured by welding circular or square plate-like support plates to the upper and lower ends of the steel pipe. In this case, welding is performed at the end of the steel pipe 30 and the end of the steel pipe 30. The backing metal 32 is attached along the inner circumference of the end portion of the steel pipe so as to close the gap (groove) between the plates 31 from the back side (see FIGS. 7 (a) and 7 (b)).

  By the way, since the pillar installed in the subway station is subjected to a large axial compression force, a steel pipe pillar made of a thick steel pipe and a steel pipe concrete pillar filled with concrete in the steel pipe have been used so far.

  In addition, although steel pipe columns with double inner steel pipes and outer steel pipes are also used, it is difficult to weld and attach support plates to both ends of the inner steel pipe and outer steel pipe. Therefore, this type of steel pipe column does not use a support plate, and the column head and column base are directly fixed and coupled to the reinforced concrete beam.

  For example, Patent Document 1 discloses a column main body portion (1), an upper bearing member (10) and a lower bearing member (11) attached to the upper end portion and the lower end portion of the column main body portion (1), respectively. An earthquake-proof reinforcing column (A) is disclosed (see FIG. 11 and Patent Document 1 FIG. 2).

  The column main body (1) is formed of a steel pipe column having a circular cross section, and is filled with concrete. The upper and lower bearing members (10), (11) are formed in a flange shape having a diameter larger than the outer diameter of the column main body (1) and face the column main body (1) side. The portion is formed in a substantially conical shape.

  According to this configuration, since the area of contact with the upper and lower structures (3) and (4) of the seismic reinforcement column (A) is expanded, the upper and lower structures (3) and (4) The transmission of force to the reinforcing column (A) is smooth, and the upper and lower structures (3), (4) can be used even when an excessive axial force acts on the seismic reinforcing column (A) during an earthquake. As a reaction, the force per unit area is reduced, and damage to the upper structure (3) or the lower structure (4) made mainly of concrete can be prevented.

  In Patent Document 2, a plurality of circular steel pipes (25) having different diameters, a plurality of partition wall steel plates (22) for partitioning the inside of the circular steel pipe (25) into a plurality of spaces, and the partition steel plate (22) are used for partitioning. There is disclosed a multi-steel tube type concrete-filled steel pipe column composed of concrete (5) filled in a plurality of spaces (see FIG. 1 of Patent Document 2).

  The plurality of steel pipes (25) having different diameters are installed concentrically in a plan view so as to form a multiple steel pipe, and the plurality of partition wall steel plates (22) are installed radially within the cross section of the multiple steel pipe. . The concrete (5) is filled in each of a plurality of spaces formed by the partition wall steel plate (22) in the cross section of the multiple steel pipe.

Japanese Patent Laid-Open No. 10-46833 JP 2016-194245

  However, the steel pipe column manufactured by welding the support plates to the upper and lower ends of the steel pipe can only be welded from the outside when welding the bearing plate to the end of the steel pipe. Since it is necessary to attach a stopper, if the steel pipe becomes more than a double pipe, the bearing plate becomes an obstacle, making it difficult to weld the inner steel pipe and the bearing plate, especially making it difficult to manufacture multi-pipe steel pipe columns. There was a problem.

  In addition, steel pipe columns made of thick steel pipes have problems that not only are the bending and welding of thick steel plates troublesome and difficult to manufacture, but the cost of steel materials increases due to the use of thick steel plates.

  Furthermore, the steel pipe concrete column is not only disadvantageous in terms of seismic design due to its increased weight, but also has a problem that the construction on site is complicated because it is necessary to fill the steel pipe with concrete.

  In addition, the type of column in which the end of the steel pipe is directly fixed to the reinforced concrete beam part without using a bearing plate, and is not so popular because the construction of the connection part between the column and the beam is complicated and troublesome. Not done.

  In addition, the seismic reinforcement column disclosed in Patent Document 1 is a mold craftsman because the upper and lower bearing members are extremely thick and the opposing portions are formed in a substantially conical shape and have a very complicated shape. There is a problem that it takes a considerable amount of time to manufacture the mold and accuracy, and the manufacturing is troublesome and expensive.

  In addition, since the concrete-filled steel pipe disclosed in Patent Document 2 needs to be filled with concrete in steel pipes that are arranged in a plurality of spaces by a plurality of partition wall steel plates and the steel pipes are doubled, At the same time it was bulky and difficult to process and weld, making it very cumbersome.

  The present invention has been made in order to solve the above-described problems, and enables a bearing plate to be welded and joined without using a backing metal at the end of a steel pipe, and a multi-tube steel pipe column is easily manufactured. It is another object of the present invention to provide a steel pipe column and a convex member for welding joining of a steel pipe column that can increase the rigidity and bearing strength of the column head and the column base.

  The present invention is an invention of a steel pipe column comprising a steel pipe and a bearing plate installed at the end of the steel pipe, and a welding joint convex part inscribed in the inner periphery of the end of the steel pipe inside the bearing plate. A weld bead is formed so that the end of the steel pipe, the support plate, and the edge of the weld joint convex portion are integrated between the end of the steel pipe and the support plate. It is characterized by.

  As the steel pipe, a first steel pipe and a second steel pipe having a smaller diameter than the first steel pipe are installed on the same axis, and a bearing plate having a diameter larger than the diameter of the second steel pipe is used as the bearing plate for the welding joint. A first weld joint convex portion and a second weld joint convex portion that are respectively inscribed in the inner periphery of the end of the first steel pipe and the inner periphery of the end of the second steel pipe are provided as the convex portions, and the first A first weld bead is formed between the end of the steel pipe and the bearing plate so that the end of the first steel pipe, the bearing plate and the edge of the first weld joint projection are integrated. And between the end portion of the second steel pipe and the convex portion for the first weld joint, the end portion of the second steel pipe, the convex portion for the first weld joint, and the convex portion for the second weld joint. By forming the second weld bead so that the edge is integrated, it is installed on the steel pipes with different diameters and the upper and lower ends. Multi-wall steel tube column comprising a bearing capacity plate has can be manufactured.

  In any steel pipe column, the support plate can be a support plate of the steel tube column, and the original support plate can be installed outside the support plate.

  Further, the bearing plate and the welding joint convex portion can be formed to a required thickness by laminating a plurality of steel plates of the same diameter as required, and the welding joint convex portion is plate-shaped, or By forming the columnar shape rather than the plate shape, the rigidity and the bearing strength of the stigma / column base can be increased.

  Furthermore, it is also possible to form the entire weld joint convex portion into a hollow shape and fill it with concrete to form a weld joint convex portion having a steel shell concrete structure. Further, by forming the bearing plate and the weld joint convex part integrally as a weld joint convex member, as a bearing plate mounting member for welding and joining the bearing plate to the end of the steel pipe, and the column head of the steel pipe column It can also be a structural member that reinforces the column base.

  In addition, the present invention is widely used not only for pillars installed in subway stations or for structures on the ground but also for infrastructure development such as piers, transmission / distribution communication pillars, disaster prevention radio pillars, or lighting pillars. Applicable.

  In addition, the planar shape of each steel pipe, the bearing plate, and the welding joint convex portion may be a circle, a rectangle, or a polygon such as a hexagon or an octagon, and is not particularly limited.

  According to the present invention, on the inner side of the bearing plate welded and joined to the end of the steel pipe, a weld joint convex portion inscribed in the inner periphery of the end of the steel pipe is provided so as to protrude from the end of the steel pipe. When the bearing plate is welded, the convex portion for welding joining is located between the end of the steel pipe and the bearing plate and acts as a backing metal, so that the original back of the end of the steel pipe is provided. There is no need to attach a pad. For this reason, it becomes possible to weld-join a bearing plate to the ends of a plurality of steel pipes having different diameters, and a multi-tube steel pipe column can be easily manufactured.

  Also, by stacking a plurality of steel plates to make thick convex parts or short columnar convex parts, and further to weld joint convex parts of steel shell concrete structure, it is also possible to transmit the load and make the column head and column base part The rigidity and bearing strength can be significantly increased.

  Further, the bearing plate and the welding joint convex part are integrally formed as a welding joint convex member, so that the bearing plate is welded and joined to the end of the steel pipe, and the column head of the steel pipe column It can also be a structural member that reinforces the column base.

FIG. 1 (a) is an embodiment of the present invention, and FIG. 1 (a) is a longitudinal sectional view of a steel pipe column composed of a steel pipe and supporting pressure plates installed at both upper and lower ends thereof, and FIG. 1 (b) and FIG. FIG. 2 is a longitudinal cross-sectional view showing a state in which a pressure-bearing plate is installed in the steel pipe column shown in FIG. 1 (a) in a state where the connection between the pipe end portion of the steel pipe and the convex member is different. FIG. 2 (a) is a partial perspective view of the end of the steel pipe before welding and the convex member for welding joining, and FIG. 2 (b) shows the lower end of the longitudinally cut steel pipe column. It is the partial perspective view by which the welding was joined. FIG. 3 (a) is a bottom longitudinal sectional view of a steel pipe column composed of a plurality of steel plates each laminated with a bearing plate and a welding joint projection, and FIG. b) is a lower longitudinal sectional view of a steel pipe column whose convex part for welding joining is made of steel shell concrete, and 3 (c) is a lower longitudinal sectional view of the steel pipe column in which a support plate is installed outside the bearing plate. FIG. 4 (a) is another embodiment of the present invention, and FIG. 4 (a) is a longitudinal section of a double steel pipe column composed of an outer steel pipe and an inner steel pipe and joint plates installed at both upper and lower ends thereof, and FIG. It is a double steel pipe pile illustrated to 4 (a), Comprising: It is a longitudinal cross-sectional view which shows the state by which the joint plate was attached only to the lower end part of the steel pipe. 4 (c) and 4 (d) are embodiments in which the steel pipe is filled with concrete, FIG. 4 (c) is the inside steel pipe of the double steel pipe, and FIG. 4 (d) is the inside. A longitudinal state in which concrete is filled between the steel pipe and the outer steel pipe is shown. FIG. 5 (a) is a bottom longitudinal sectional view of a steel pipe column made of a steel plate in which a bearing plate and a welding joint convex portion are respectively laminated, FIG. b) is a lower longitudinal sectional view of a steel pipe column in which the convex part for welding joint is made of steel shell concrete, and 5 (c) is a lower longitudinal sectional view of the steel pipe column in which a support plate is installed outside the bearing plate. 6 (a) to 6 (d) are longitudinal sectional views showing the procedure of the method for manufacturing the double steel pipe column shown in FIG. FIG. 7 (a) shows a conventional example of a method of welding and joining a bearing plate to the end of a steel pipe, and FIG. 7 (a) shows a state before the bearing plate is welded and joined to the end of the steel pipe. FIG. 7 (b) is a partial longitudinal sectional view of a steel pipe end and a bearing plate showing a welded state.

  1 to 3 show an embodiment of the present invention, and illustrate a steel pipe column composed of a single steel pipe 1 and bearing plates 2 respectively attached to upper and lower ends of the steel pipe 1.

  The bearing plate 2 is formed in a circular plate shape having a diameter larger than the outer diameter of the steel pipe 1, and a circular plate-like weld joint convex portion 3 inscribed in the inner periphery of the end portion of the steel pipe 1 is formed inside thereof. Further, a groove 4 composed of the end portion of the steel pipe 1 and the bearing plate 2 is formed continuously in the circumferential direction of the steel tube 1 between the end portion of the steel pipe 1 and the bearing plate 2.

  And in the said groove | channel 4, the edge part of the convex part 3 for welding joining is made into a backing metal, and the weld bead 5 has the edge part of the end part of the steel pipe 1, the bearing plate 2, and the convex part 3 for welding joining. Are formed continuously in the circumferential direction of the steel pipe 1 so as to be integrated.

  In particular, the bearing plate 2 and the weld joint convex portion 3 are each formed of a circular steel plate, and the bearing plate 2 and the weld joint convex portion 3 are attached to the end of the steel pipe 1 for supporting the bearing plate 2. It is integrally formed as a member and as a structural member that reinforces the head and the column base of the steel pipe column (hereinafter referred to as “weld joint convex member 6”).

  FIG. 1 (b) shows an embodiment in which the steel pipe 1 tapered on the inner side of the pipe end and the convex part 3 for welding joint are integrated by a weld bead 5, and completely melted by design. This is an embodiment in the case where is unnecessary.

  FIG. 1 (c) shows a state in which the groove 3 is formed on the outside of the pipe end and the weld joint convex portion 3 is integrated with the weld bead 5. At this time, the weld joint convex portion 3 is provided with a notch groove 3a so as to facilitate the transmission of the load from the end of the pipe, or a concrete filling hole at the center of the cross section so that the weight can be reduced and the steel pipe 1 can be filled with concrete. An embodiment in which 2a is provided is shown.

  Further, the bearing plate 2 and the welding joint projection 3 can be formed to a required thickness by laminating a plurality of circular steel plates having the same diameter as required (see FIG. 3 (a)). In particular, by forming the weld joint convex portion 3 in a short columnar shape, the rigidity and bearing strength of the column head and the column base can be increased.

  Furthermore, the weld joint convex part 3 can be formed as a steel shell concrete structure by forming the whole hollow and filling the concrete 7 therein (see FIG. 3 (b)). In this case, the filling hole 2a of the concrete 7 is formed in the bearing plate 2, and a reinforcing rib (not shown) is provided in the hollow portion of the convex portion 3 for welding joint so as not to disturb the filling property of the concrete 7 as necessary. ) Is installed.

  The bearing plate 2 also serves as a bearing plate that basically transmits the axial force acting on the steel pipe 1 to the structure (slab or beam). In particular, the original bearing plate 8 is provided outside the bearing plate 2 in order to increase the supporting force. It may be installed (see Fig. 3 (c)).

  In such a configuration, the steel pipe manufacturing method illustrated in FIG. 1 will be described. The welding joint convex member 6 in which the bearing plate 2 and the welding joint convex portion 3 are integrally formed is placed on the floor, The steel pipe 1 is set up on it. And by welding the inside of the groove | channel 4 between the lower end part of the steel pipe 1 and the bearing plate 2 continuously in the circumferential direction of the steel pipe 1, the edge part of the steel pipe 1, the bearing plate 2, and the convex part 3 for welding joining are connected. Weld together.

  Next, the convex member 6 for welding joining is newly installed in the upper end part of the steel pipe 1. FIG. And by welding the inside of the groove | channel 4 between the upper end part of the steel pipe 1 and the bearing plate 2 continuously in the circumferential direction of the steel pipe 1, the upper end part of the steel pipe 1, the bearing plate 2, and the convex part 3 for welding joining are connected. Weld together. By the above procedure, the steel pipe column provided with the bearing plate (support plate) 2 at the upper and lower ends of the steel pipe 1 can be easily manufactured.

  As another manufacturing method, the steel pipe 1 is placed horizontally on a gantry (not shown). Next, the convex member 6 for welding joining is installed in the both ends of the steel pipe 1. FIG. Then, the end of the steel pipe 1, the support plate (support plate) 2, and the edge of the weld joint convex portion 3 are integrated in the groove 4 between the end of the steel tube 1 and the support plate (support plate) 2. Are continuously welded in the circumferential direction of the steel pipe 1. The steel pipe pile which has the bearing plate (support plate) 2 in the both ends of the steel pipe 1 also by the above procedure can be manufactured.

  4 to 6 show another embodiment of the present invention, in which a first steel pipe (hereinafter “outer steel pipe”) 9 and a second steel pipe (hereinafter referred to as “inner steel pipe”) 10 having a smaller diameter than the outer steel pipe 9 are illustrated. And a multi-pipe steel pipe column (hereinafter referred to as “double steel pipe column”) provided with a bearing plate 11 having a diameter larger than the diameters of the outer steel pipe 9 and the inner steel pipe 10.

  The outer steel pipe 9 and the inner steel pipe 10 are concentrically arranged on the same axis, and the bearing plate 11 is formed in a circular plate shape having a diameter larger than that of the outer steel pipe 9 and the inner steel pipe 10, and the outer steel pipe 9 is disposed inside thereof. A circular plate-shaped weld joint convex portion 12 inscribed in the inner periphery of the end portion is formed, and further, a circular plate-shaped weld joint convex portion 13 inscribed in the inner periphery of the end portion of the inner steel pipe 10 inside the weld joint convex portion 12. Is formed.

  Further, a groove 14 composed of the end portion of the outer steel pipe 9 and the bearing plate 11 is continuously formed in the circumferential direction of the outer steel tube 9 between the end portion of the outer steel tube 9 and the bearing plate 11. Further, a groove 15 consisting of the end portion of the inner steel pipe 10 and the convex portion 12 for welding joining is continuously provided in the circumferential direction of the inner steel pipe 10 between the end portion of the inner steel pipe 10 and the convex portion 12 for welding joining. Is formed.

  And the edge part of the welding joint convex part 12 is used as a backing metal in the groove 14, and the weld bead 16 is connected to the end part of the outer steel pipe 9, the bearing plate 11 and the convex part 12 for welding joint. Are formed continuously in the circumferential direction of the outer steel pipe 9 so as to be integrated with each other.

  Further, the edge of the weld joint convex portion 13 is used as a backing metal in the groove 15, and the weld bead 17 is connected to the end of the outer steel pipe 9, the weld joint convex portion 12, and the weld joint convex portion 13. The inner steel pipe 10 is continuously formed in the circumferential direction so as to be integrated with the edge portion.

  In particular, the bearing plate 11 and the weld joint convex portions 12 and 13 are each formed of a circular steel plate, and the weld joint convex portions 12 and 13 weld the weld joint convex portion 12 to the end of the inner steel pipe 10. It is integrally formed as a structural member called a welding-joint convex member 18 for joining. In addition, the convex member 6 for welding joining demonstrated in embodiment of FIGS. 1-3 can be installed as the convex member 18 for welding joining.

  4 (c) and 4 (d) illustrate a modified example of FIG. 4 (a) .The double steel pipe column in FIG. The heavy steel pipe column is filled with concrete 19 between the inner steel pipe 10 and the outer steel pipe 9. Reference numeral 11a denotes a concrete filling port for the concrete 19, which is formed so as to communicate with the joint plate 11 and the weld joint convex portions 12 and 13.

  In addition, the concrete steel 19 is inserted between the inner steel pipe 10 and the outer steel pipe 9 in the double steel pipe column in FIG. 4 (c) and between the inner steel pipe 10 and the outer steel pipe 9 in the double steel pipe column in FIG. Reinforcing ribs (not shown) are installed so as not to prevent filling.

  Further, the bearing plate 11 and the weld joint convex portions 12 and 13 may be formed to a necessary thickness by laminating a plurality of circular steel plates as necessary (see FIG. 5 (a)), or Alternatively, the entire welded projections 12 and 13 can be formed hollow and filled with concrete 19 to form a steel shell concrete structure (see FIG. 5 (b)). In this case, a filling hole 11 a of concrete 19 is formed in the bearing plate 11. Reinforcing ribs (not shown) are installed in the hollow portions of the welding joint convex portions 12 and 13 so as not to prevent the filling of the concrete 19 as necessary.

  The bearing plate 11 also serves as a bearing plate for transmitting axial force acting on the outer steel tube 9 and the inner steel tube 10 to the structure. In particular, the original bearing plate 20 is provided outside the bearing plate 11 in order to increase the supporting force. May be installed (see FIG. 5 (c)).

  In such a configuration, the method for manufacturing the double steel pipe column illustrated in FIG. 4 will be described. First, the weld joint convex portion 12 and the weld joint convex portion 13 are integrally welded to each other, as shown in FIG. A weld joint convex member 18 having the same shape as the weld joint convex member 6 shown in FIG. 3 is formed.

  Next, the convex member 18 for welding joining is placed on the floor, and the inner steel pipe 10 is erected thereon. Next, inside the groove 15 between the lower end portion of the inner steel pipe 10 and the weld joint convex portion 12, the end portion of the inner steel pipe 10, the weld joint convex portion 12, and the edge end portion of the weld joint convex portion 13 are The inner steel pipe 10 is continuously welded in the circumferential direction so as to be integrated.

  Next, the convex member 18 for welding joining is installed at the upper end of the inner steel pipe 10. The upper end of the inner steel pipe 10 and the edge of the weld joint convex portion 13 are integrated with the inside of the groove 15 between the upper end portion of the inner steel pipe 10 and the convex portion 12 for weld joint. Are continuously welded in the circumferential direction of the inner steel pipe 10.

  By the above procedure, the steel pipe column 20 having the welded joints 12 and 13 at the upper and lower ends of the inner steel pipe 10 is manufactured.

  Next, the bearing plate 11 is placed on the floor, the steel pipe column 20 is erected thereon, and the outer steel pipe 9 is erected concentrically on the outer side. The outer steel pipe 9 is formed so that the upper end of the outer steel pipe 9, the bearing plate 11, and the edge of the welded projection 12 are integrated with each other in the groove 14 between the lower end of the outer steel pipe 9 and the bearing plate 11. 9 are continuously welded in the circumferential direction.

  Next, the bearing plate 11 is installed at the upper end of the outer steel pipe 9. Then, the outer steel pipe 9 is formed so that the upper end of the outer steel pipe 9, the bearing plate 11, and the edge of the welding joint convex portion 12 are integrated in the groove 14 between the upper end of the outer steel pipe 9 and the bearing plate 11. 9 are continuously welded in the circumferential direction. The double steel pipe column which has the bearing plate (support plate) 11 in the upper and lower both ends of the outer steel pipe 9 and the inner steel pipe 10 by the above procedure can be manufactured.

  In addition, the inner steel pipe 10 is installed horizontally on the gantry (not shown), and the steel pipe column 20 is manufactured by welding and welding the welded convex members 18 to both ends thereof. The bearing plates 11 are welded to both ends of the steel pipe pile 20, respectively.

  Also according to the above procedure, a double steel pipe column provided with bearing plates (support plates) 11 at both upper and lower ends of the outer steel pipe 9 and the inner steel pipe 10 can be easily manufactured.

  It is an object of the present invention to provide a steel pipe column in which a support plate can be welded to an end of a steel pipe without using a backing metal, and the rigidity and supporting strength of a column head and a column base can be easily increased. it can.

1 Steel pipe 2 Bearing plate
2a Concrete filling hole 3 Convex part for welding joint
3a Notch groove 4 Groove 5 Weld bead 6 Convex member 7 for welded joints 8 Support plate 8 Concrete 9 Inner steel pipe (first steel pipe)
10 Outer steel pipe (second steel pipe)
11 Bearing plate
11a Concrete filling port
12 Convex part for welding joint (Convex part for first weld joint)
13 Weld joint convex part (second weld joint convex part)
14 Groove
15 groove
16 Weld beads (first weld bead)
17 Weld beads (second weld beads)
18 Convex member for welding joint
19 Concrete
20 Steel pipe columns

Claims (6)

A steel pipe column comprising a steel pipe, a bearing plate installed at an end of the steel pipe, and a welding joint projection protruding from the inside of the bearing plate , wherein the welding joint projection is It is formed in a plate shape or a column shape inscribed from the steel shell concrete to the inner periphery of the end portion of the steel pipe, and the end portion of the steel pipe, the support pressure plate, and the convex for welding connection are provided between the end portion of the steel pipe and the support pressure plate. A steel pipe column comprising a weld bead formed so as to be integrated with a portion.   A first steel pipe disposed on the same axis, a second steel pipe having a smaller diameter than the first steel pipe, and a diameter larger than the diameter of the second steel pipe, and installed at the ends of the first and second steel pipes. A steel pipe column provided with a support plate, and a first weld joint convex portion which is inscribed inside the end plate inner periphery and the end inner periphery of the second steel pipe inside the support plate, respectively. Two weld joint projections are respectively provided, and between the end portion of the first steel pipe and the bearing plate, the end portion of the first steel pipe, the bearing plate, and the first weld joint projection, The first weld bead is formed so as to be integrated, and the end of the second steel pipe and the first weld joint convex are between the end of the second steel pipe and the first weld joint convex. A steel pipe column, wherein a second weld bead is formed so that the portion and the second weld joint convex portion are integrated. Steel pipe and a bearing capacity plate installed on the end of the steel pipe, a column capital portion and / or the column base of the steel pipe column comprising a weld joint protrusions projecting from the inside of the Bearing plate The weld joint convex portion is formed in a plate shape or a column shape inscribed from the steel shell concrete to the inner periphery of the end portion of the steel pipe , and between the end portion of the steel pipe and the bearing plate, steel columns and the bearing capacity plate and the weld joint protrusion is characterized by comprising formed weld bead to form an integral.   A column head and / or a column base part of a steel pipe column composed of a first steel pipe arranged on the same axis and a second steel pipe having a smaller diameter than the first steel pipe, at the end of the first and second steel pipes For the first and second weld joints installed on the inner side of the bearing plate, the inner end of the first steel pipe and the inner circumference of the end of the second steel pipe. A projecting portion, and the end portion of the first steel pipe, the bearing plate and the projecting portion for the first welding joint are integrated between the end portion of the first steel pipe and the bearing plate. A first weld bead is formed, and an end portion of the second steel pipe, the first weld joint convex portion, and the second weld are formed between the end portion of the second steel pipe and the first weld joint convex portion. A steel pipe column in which a second weld bead is formed so as to be integrated with a joining convex portion. It is a convex member for welding joint of a steel pipe column which is formed from a bearing plate and a welding joint convex part protruding from the inside of the bearing plate and welded to the end of the steel pipe, and the bearing plate is The steel pipe column is formed with a diameter larger than the outer diameter of the steel pipe, and the weld joint convex part is formed in a plate shape or a column shape inscribed in an inner periphery of an end portion of the steel pipe from a steel shell concrete . Convex-type member for welding joints.   6. A convex member for welding and joining steel pipe columns according to claim 5, wherein the bearing plate is formed of a support plate.