JP2002180542A - Structure for round-steel-pipe column and manufacturing method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure for a round-steel-pipe column, wherein a section between beam flanges of a round steel pipe is reinforced. SOLUTION: This structure is constituted by coupling the beam flanges 12 to plural places on the outer peripheral surface 10a of the round steel pipe 10 by weld beads 15 constructed throughout the periphery of the surface 10a. The weld beads 15 remain in a rib shape on the surface 10a between the beam flanges 12, and the section between the beam flanges 12 can be reinforced by the remaining rib-shaped weld beads 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for a round steel tube column used as a steel tube column structure of a steel structure, for example, and a method for manufacturing the structure for a round steel tube column.

[0002]

2. Description of the Related Art Conventionally, as a method of attaching a diaphragm to a column side, for example, a through-diaphragm system and an inner diaphragm system have been provided. The through-diaphragm system has the configuration shown in FIGS. 13 to 15, for example.

[0003] That is, in the length direction of the strut,
It is cut (divided) into a lower support 31, a panel zone column 32, and an upper support 33. And lower strut 31
The lower diaphragm 34 is welded to the upper end of the column via a backing material, and the lower end of the column 32 is welded to the lower diaphragm 34 via a backing material. Further, an upper diaphragm 35 is welded to the upper end of the column 32 via a backing material.
The lower end of the upper support 33 is welded via a backing material.

The lower column 31, the column 32 and the upper column 33 are made of round steel pipes having the same thickness, and the lower diaphragm 34 and the upper diaphragm 35 are composed of the lower column 31, the column 32 and the upper column. It is made of a substantially rectangular plate having an outer dimension larger than the outer dimension such as 33 and having a cut corner.

In the column 36 thus formed, the connection of the beam (mainly an H-shaped steel member) 40 to the column 32 forming the panel zone is performed by connecting the free ends of a pair of upper and lower beam flanges 41 of the beam 40. Both diaphragms 34, 3
5 by welding. That is, the beam flange 41 is attached to both the diaphragms 34 and 35 by the welding beads 4.
5, the end of the beam flange 41 has a groove 4
2 are formed.

A back metal plate 37 is attached to the lower surfaces of the diaphragms 34 and 35 by welding, and an end tab (or an extension of the back metal plate) 38 as an auxiliary member is provided at both longitudinal ends of the back metal plate 37. Are attached by tack welding or the like.

The beam flange 41 has two end tabs 38.
In the state of being placed on the back sheet metal 37 between the two ends, the end thereof is brought close to the outer side surfaces of the two diaphragms 34 and 35, and in this state, after passing through the groove 42 from one end tab 38, the other end tab The tack welding is performed on the surface 38. This tack welding is sequentially performed on the four beam flanges 41.

Then, the first layer welding is sequentially performed on each beam flange 41, and thereafter, the second layer welding is performed in the same manner.
The third layer welding and the welding of the predetermined layer are sequentially performed.
The connection of each beam flange 41 to the welding flange 2 by the welding bead 45 is performed. Thereafter, the end tabs 38 are removed by gas cutting or the like.

[0009]

However, in the above-described conventional structure of the column 36, the welding bead 45 is interrupted at the end tab 38, and the column 32
In this case, the strength between the beam flanges 41 was low.

In the above-mentioned conventional welding connection method, two end tabs 38 must be attached to each back metal plate 37. That is, when welding the beam 40 to four locations on the outer peripheral surface, a total of 16 end tabs are required. End tabs 3
8, and the tack welding work is troublesome. In addition, multi-layer welding work including tack welding,
By breaking at the end tab 38, welding,
Since the stop is repeated for each beam flange 41, it cannot be easily performed, and the efficiency is low. In addition, welding defects tend to occur in the end tab 38 portion.

Further, after the welding of the beam flange 41 is performed, the end tabs 38 are removed by gas cutting, which requires a removing operation step (man-hour), and the removing operation cannot be performed easily.

It is an object of the present invention to provide a structure for a round steel pipe column which can reinforce a portion between beam flanges in a round steel pipe.
Further, the invention according to claim 4 of the present invention is intended for a round steel pipe column in which an auxiliary member for welding can be easily attached and removed, and a welding operation can be easily and efficiently performed without generating welding defects. It is an object of the present invention to provide a method for manufacturing a structure.

[0013]

In order to achieve the above-mentioned object, a structure for a round steel pipe column according to claim 1 of the present invention is provided at a plurality of locations on the outer peripheral surface of the round steel pipe. The beam flange is connected by a weld bead constructed over the entire circumference.

Therefore, according to the first aspect of the invention, the weld bead remains in the form of a rib on the outer peripheral surface between the beam flanges. According to a second aspect of the present invention, there is provided the structure for a round steel pipe column according to the first aspect of the present invention, wherein the round steel pipe is formed by forming a portion for welding and joining a beam flange to a thickened panel portion. It is characterized by doing.

Therefore, according to the second aspect of the present invention, the welded joint portion of the beam flange can be reinforced by the thickened panel portion. The structure for a round steel pipe column according to claim 3 of the present invention is the structure according to claim 1 or 2 described above.
The present invention is characterized in that a beam flange having a widened portion is connected to an outer peripheral surface of a round steel pipe.

Therefore, according to the third aspect of the present invention, the interval (gap) between adjacent beam flanges can be made narrower by the widened portion in accordance with the dimensional difference of the beam width with respect to the diameter of the round steel pipe. Further, according to the method for manufacturing a structure for a round steel pipe column according to claim 4 of the present invention, a groove is formed at an end of a beam flange when welding a beam to a plurality of locations on an outer peripheral surface of the round steel pipe. On the outer peripheral surface of the round steel pipe, a relay member having a groove portion connected to the beam flange groove portion is attached, and welding connection is performed to connect the relay member groove portion from one beam flange groove portion. This is characterized in that the process is performed continuously to the other beam flange groove portion.

Therefore, according to the fourth aspect of the present invention, it is sufficient to mount the relay member only between the beam flanges.
For example, when welding beam flanges to four locations on the outer peripheral surface, a total of eight relay members may be attached. further,
The welding work of a plurality of beam flanges can be continuously performed on the entire circumference without repeating welding and stopping, and a rib-shaped weld bead remains on the outer peripheral surface between the beam flanges.

According to a fifth aspect of the present invention, there is provided a method for manufacturing a structure for a round steel pipe column according to the fourth aspect, wherein beam flanges are temporarily welded to a plurality of locations on the outer peripheral surface of the round steel pipe. After that, the relay member is attached between the two beam flanges, and after the continuous welding connection is performed, the relay member is removed.

Therefore, according to the fifth aspect of the present invention, attachment and removal of the relay member can be easily performed by utilizing elasticity, and the relay member after removal can be reused. According to a sixth aspect of the present invention, there is provided a method for manufacturing a structure for a round steel pipe column, wherein the relay member is made of ceramics in the configuration of the fifth aspect.

Therefore, according to the invention of claim 6, the relay member made of ceramics can be removed by removal or the like.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. As shown in FIGS. 1-3, a round steel pipe 10 forming a panel zone
Is a thin portion 1 having a predetermined thickness t at both end portions in the longitudinal direction.
0A, and the remaining intermediate portion is a thin portion 10
It is formed on the thickened panel portion 10B having a plate thickness T larger than the plate thickness t of A and a length (height) L forming a panel zone. Here, the predetermined plate thickness t is determined from the viewpoint of preventing local deformation of the surface and the panel shear deformation. For example, when the outer dimension W is 450 mm, the plate thickness t of the thin portion 10A increases by about 17 mm. The thickness T of the thick panel portion 10B is 40 m.
It is ranked m.

The outer surface 10a of the round steel pipe 10
The beam flanges 12 of the short beam 11 are connected to the locations (plural locations) by welding beads 15. That is, the short beam 11 has an H-shaped steel shape, and one end side of the beam flange 12 located on the upper and lower sides (the side connected to the round steel pipe 10) is formed in an outwardly expanding widened portion 12A.

The widened portion 12A is for narrowing the interval (gap) between adjacent beam flanges 12 in accordance with the dimensional difference of the beam width a with respect to the diameter D of the round steel pipe 10, and is short. It is formed integrally with the manufacture of the beam 11, or by the remainder obtained by removing a part of the beam flange 12, or by welding a right triangle plate.

The beam flange 12 including the widened portion 12A
A groove 13 is formed at the end of the steel plate, and a back metal plate 14 that is welded to the round steel pipe 10 is positioned on the back side of the groove 13. Here beam flange 1
2 and the end surface of the back metal plate 14 are formed in an arc shape along the outer peripheral surface 10a.

The outer surface 10a of the round steel pipe 10
The beam flange 12 of the short beam 11 is connected to each location by a weld bead 15 constructed over the entire outer peripheral surface 10a, whereby the structure 8 for a round steel pipe column is formed.

The round steel pipe 10 having the short beam 11 having such a structure, that is, the structure 8 for a round steel pipe column is shown in FIG.
As shown in FIG. 5, the round steel pipe column 1 can be formed by welding and joining 3 to the long round steel pipe 2 in the length direction. Here, the plate thickness of the long round steel pipe 2 is the plate thickness t of the thin portion 10A.
Is equivalent to

When performing the above-described welding connection 3, a backing metal 4 is set in a ring shape as needed inside the welding location. When the backing metal 4 is not used, welding connection from inside and outside is adopted. In addition, welding can be performed by fitting the ends of the round steel pipe 10 and the long round steel pipe 2 to each other.

In the round steel pipe column 1, the long beam 5 is connected to the free end of each short beam 11 in the round steel pipe column structure 8 by welding or a connection tool (bolt connection).
In addition, as shown by the imaginary line in FIG.
After being arranged in a stack, the upper and lower portions thereof are welded to form a predetermined length (height).

In the first embodiment described above, the beam flanges 12 of the short beams 11 are welded to the four positions on the outer peripheral surface 10a. However, the round steel pipe column 1 is provided at the middle between the corners and the side portions. When used, a stiffening plate is provided on some surfaces.

FIG. 6 shows a second embodiment in which the round steel pipe column 1 is used at a corner. At this time, stiffening plates 17 are provided in place of the beam flanges 11 at two places where the long beams 5 are not connected by turning outward at the corners. The stiffening plate 17 also has a groove portion 18 and is temporarily welded with its arc-shaped end face in contact with the outer peripheral surface 11a.

The beam flange 12 of the short beam 11 is provided at each of four places on the outer peripheral surface 10a of the round steel pipe 10 by using the stiffening plate groove 18 in the same manner as in the first embodiment.
Is a weld bead 1 constructed over the entire circumference of the outer peripheral surface 10a.
5 to form a round steel pipe column structure 8.

FIG. 7 shows a third embodiment in which the round steel pipe column 1 is used in the middle of the side part. At this time,
A stiffening plate 17 is provided in place of the beam flange 11 at one side where the long beam 5 is not connected to the outside.

As in the second and third embodiments described above, the stiffening plate 17 is provided at a place where the long beam 5 is not connected, so that the stiffener plate 17 can be installed at other places. The connection of the beam flange 11 can be performed by the welding bead 15 constructed over the entire outer periphery 10a. In addition, the stiffening plate 17 plays a role of restraining out-of-plane deformation at a portion where the beam flange 11 is not connected (securing out-of-plane rigidity of the column section).

Next, a fourth embodiment of the present invention will be described with reference to FIG. In the first to third embodiments described above, the short beam 11 is welded to the outer peripheral surface 10a of the round steel pipe 10, and the long beam 5 is connected to the free end of the short beam 11. In this case, the long beam 5 may be directly welded and connected. That is, as shown in FIG.
The beam flange 6 of the long beam 5 is directly connected to the outer peripheral surface 10a by a weld bead 15. In this case, the groove portion 7 is formed on the upper and lower beam flanges 6, and the tack welding, the connection by the welding bead 15, and the like can be performed in the same manner as in the above-described first to third embodiments.

Next, a fifth embodiment of the present invention will be described with reference to FIG. In the above-described first to fourth embodiments, the round steel pipe column 1 is configured by welding and joining the round steel pipe column structure 8 to the long round steel pipe 2 in the length direction. However, this may be a round steel pipe column structure 8 integrally having the long round steel pipe 2. That is, as shown in FIG. 9, a panel zone for connecting the short beam 11 is formed by the thickened panel portion 10B below the long round steel tube 10, and the long round steel tube 10 is stacked. After being arranged, the upper and lower portions are welded and joined 3 to form a round steel pipe column 1 having a predetermined length (height).

Next, the method of manufacturing the above-mentioned structure 8 for a round steel pipe column will be described with reference to FIGS. 10 to 12 in a configuration in which the beam flanges 12 are connected to four places as in the first embodiment. explain.

That is, the short beam 1 is attached to the round steel pipe 10.
In order to weld the beam flange 12 of the first steel sheet, first, in a state where the beam flange 11 is set to the back sheet metal 14 whose end face is in contact with the outer peripheral surface 10a of the round steel pipe 10 and is welded, the back sheet metal is The beam flange 11 is tack-welded to the outer peripheral surface 10a using the joint 14. Next, 4 of the outer peripheral surface 10a
In a state where the beam flanges 11 are tack-welded to the respective locations, a ceramic relay member 20 is attached between adjacent beam flanges 11.

The connection of the group of relay members 20 is performed by enlarging the widened portions 1 of the pair of beam flanges 12 that are adjacent to each other at right angles.
This is performed by being fitted between the outer surfaces of 2A. At that time, the fitting is performed in a state against the elasticity of the back metal plate 14 or the like, so that the mounting is performed without falling off by the elastic force. The relay member 20 also has a groove 21, and the arc-shaped end surface 20 a of the relay member 20 is in contact with the outer peripheral surface 10 a.

As described above, the temporary welding of the beam flange 12 is performed on each of the four portions of the round steel pipe 10, and the connecting member 20 is fitted between the adjacent portions of the beam flange 12. The groove portions 13, 21 are continuously arranged in a circle outside the outer peripheral surface 10a.

In such a state, the welding torch 25
The welding connection is performed through such as. That is, the welding connection is started from, for example, a beam flange groove 13 on one (a) beam flange 12.
Is continuously performed in the width direction (circumferential direction of the round steel pipe 10), and then from the end thereof, continuously enters the relay member groove 21 of the relay member 20, and is performed continuously. Another) beam flange groove 1 in beam flange 12
3. Next relay member groove 21, next beam flange groove 1
3 is performed continuously.

Thus, the welding of the first layer can be performed continuously over the entire circumference of the round steel pipe 10 without stopping on the way. Subsequently, in the same manner, the welding of the second layer and the welding of the third layer are performed in this order, and the beam flanges are formed on the outer peripheral surface 10a by welding of the predetermined layer (V-shaped butt welding). 12 may be welded together to form a weld bead 15 all around.

The beam flange 1 with respect to the outer peripheral surface 10a
The welding connection 2 is performed at the upper and lower beam flanges 12, for example, simultaneously. Then, after the welding connection, the relay member 20 is removed. At this time, the relay member 20 fitted against the elasticity can be easily removed against the elasticity of the back plate 14 or the like. Reuse is also possible and economical. By removing the relay member 20, FIG.
As shown in FIG. 5, a weld bead 15 remains in a rib shape between adjacent beam flanges 12.

As described above, according to the manufacturing method of the present invention, the relay member 20 only needs to be attached between the beam flanges 12, that is, the beam flange 12 is welded to, for example, four locations on the outer peripheral surface 10a. In some cases, since a total of eight relay members 20 need only be mounted, the mounting operation is easy, and the ceramic relay members 20 can be easily removed by removal. As described above, attachment and removal of the relay member 20 (auxiliary member) for welding connection can be easily performed.

Furthermore, the welding work of the beam flanges 12 at a plurality of locations can be easily and efficiently performed by continuously performing the entire circumference without repeating welding and stopping.
In addition, the rib-shaped weld bead 15 remains on the outer peripheral surface 12a between the beam flanges 12, and the portion between the beam flanges 12 in the round steel pipe 10 can be reinforced by the rib-shaped weld bead.

In the above description, the relay member 20 made of ceramics is used and removed after welding, but the relay member may be made of a metal such as iron or copper or a non-metal. You may.

The method of manufacturing the above-mentioned structure 8 for a round steel pipe column uses the beam flanges 12 at four locations as in the first embodiment.
Have been described, but this also applies to the second to fifth embodiments.

In each of the embodiments described above, the round steel pipe 10 and the long round steel pipe 2 may be cold-formed or hot-formed. In each of the above-described embodiments, the round steel pipe 10 has a panel zone portion for joining the beam flanges 12 formed in the thickened panel portion 10B and reinforced, thereby eliminating the need for a diaphragm. Welding points can be omitted. However, depending on the outer dimensions of the steel pipe column employed according to the scale of the steel structure, the round steel pipe 10 may be formed such that the entire length is formed in the thin portion 10A and the thickened panel portion 10B is not formed. .

In each of the above-described embodiments, an outwardly expanding portion 12A is formed at one end of the beam flange 12, whereby the out-of-plane rigidity of the columnar surface can be suitably secured. Also, by widening the flange width at the beam end, it is possible to prevent early joint rupture at the time of a large earthquake. However, the dimensional difference of the beam width a with respect to the diameter D of the round steel pipe 10 is caused by the interval (gap) between adjacent beam flanges 12.
If it is not necessary to form the beam flange 12 narrow, the beam flange 12 without the widened portion 12A may be used.

In each of the above embodiments, welding is performed by an electroslag welding machine or an electrogas arc welding machine, and according to this, high quality welding can be performed in a short time. Note that another welding method such as a laser may be used.

[0050]

According to the first aspect of the present invention, the rib-like weld beads remaining on the outer peripheral surface between the beam flanges can reinforce the space between the beam flanges.

According to the second aspect of the present invention, the portion where the beam flange is welded can be reinforced by the thickened panel portion,
As a result, the shear strength of the beam joint panel (panel zone) can be increased, and the seismic strength of the steel frame can be significantly increased. In addition, even without a diaphragm, the same out-of-plane stiffness as that of a diaphragm can be secured, eliminating the need for a diaphragm, reducing the number of parts and reducing the number of welding points (welding man-hours). Can be reduced.

According to the third aspect of the present invention, the interval (gap) between adjacent beam flanges can be narrowed by the widened portion according to the dimensional difference of the beam width with respect to the diameter of the round steel pipe. Out-of-plane deformation of the square steel pipe can be prevented.

Further, according to the fourth aspect of the present invention, in order to manufacture a structure for a round steel pipe column, a relay member may be attached only to a corner portion, that is, for example, beam flanges are provided at four positions on the outer peripheral surface. When welding is performed, a total of eight relay members need only be mounted, and mounting of the relay members for welding can be easily and quickly performed. The welding work of the beam flanges at a plurality of locations can be performed easily and efficiently by continuously performing the entire circumference without repeating welding and stopping, and the occurrence of welding defects due to the omission of the end tabs. No high quality welding can be ensured. In addition, the continuous welding work of the entire circumference can be completely automated by, for example, robot welding, so that it is possible to greatly reduce costs, shorten delivery times, and improve the working environment by saving labor.

According to claim 5 of the present invention,
Attachment and removal of the relay member can be easily performed by utilizing elasticity, and the ceramic relay member after removal can be reused (recycled), which is economical.

According to the sixth aspect of the present invention, the ceramic relay member can be easily and quickly removed by removing it.

[Brief description of the drawings]

FIG. 1 shows a first embodiment of the present invention and is a perspective view of a structure for a round steel pipe column.

FIG. 2 is a plan view of the round steel pipe column structure.

FIG. 3 is a longitudinal sectional view of a main part of the round steel pipe column structure.
(A) is a beam flange connection part, (b) is a part between beam flanges.

FIG. 4 is a vertical sectional front view of the round steel pipe column.

FIG. 5 is a partially cutaway perspective view of the round steel pipe column.

FIG. 6 shows the second embodiment of the present invention and is a plan view of a structure for a round steel pipe column.

FIG. 7 shows a third embodiment of the present invention and is a plan view of a structure for a round steel pipe column.

FIG. 8 shows a fourth embodiment of the present invention, and is a longitudinal sectional front view of a round steel pipe column.

FIG. 9 is a longitudinal sectional front view of a round steel pipe column, showing a fifth embodiment of the present invention.

FIG. 10 is a perspective view of the structure for a round steel pipe column, showing a method for manufacturing the structure for a round steel pipe column of the present invention.

FIG. 11 is a plan view of the round steel pipe column structure.

FIG. 12 is a longitudinal sectional view of a main part of the round steel tube column structure.
(A) is a beam flange connection part, (b) is a part between beam flanges.

FIG. 13 shows a conventional example and is a cross-sectional plan view of a structure for a round steel pipe column.

FIG. 14 is a side view of a main part of the round steel tube column structure.

FIG. 15 is a perspective view of a main part of the round steel tube column structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Round steel pipe column 2 Long round steel pipe 5 Long beam 6 Beam flange 7 Beam flange groove 8 Round steel pipe column structure 10 Round steel pipe 10A Thin section 10B Thickened panel section 10a Outer peripheral face 11 Short beam REFERENCE SIGNS LIST 12 beam flange 12 A widened portion 13 beam flange groove portion 14 back metal plate 15 weld bead 17 stiffening plate 18 stiffening plate groove portion 20 ceramic relay member 20 a end face 21 relay member groove 25 welding torch a beam width t Predetermined plate thickness T Thick plate thickness D Diameter of round steel pipe 10

Claims (6)

[Claims] 1. A structure for a round steel pipe column, wherein a beam flange is connected to a plurality of locations on the outer circumferential surface of the round steel pipe by welding beads constructed over the entire outer circumference of the steel pipe. . 2. A structure for a round steel pipe column according to claim 1, wherein the round steel pipe is formed by forming a portion for welding and connecting a beam flange to a thickened panel portion. 3. The round steel pipe is formed by connecting a beam flange having a widened portion to an outer peripheral surface of the round steel pipe.
Or the structure for a round steel pipe column according to 2. 4. A groove is formed at an end of a beam flange to weld a beam to a plurality of locations on an outer peripheral surface of a round steel pipe, and a beam flange groove is formed on an outer peripheral surface of the round steel pipe. A relay member having a groove portion connected to the portion is attached, and welding connection is performed continuously from one beam flange groove portion to the other beam flange groove portion via the relay member groove portion. A method for producing a structure for a round steel pipe column, characterized by comprising: 5. A beam flange is tack-welded to a plurality of locations on an outer peripheral surface of a round steel pipe, a relay member is attached between the two beam flanges, and after continuous welding connection is performed, the relay member is removed. The method for producing a structure for a round steel pipe column according to claim 4, wherein the method is performed. 6. The method according to claim 4, wherein the relay member is made of ceramics.