JP2002294865A - Steel pipe column - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a steel pipe column easily and accurately securing the relative positional relationship before welding, preferable in welding of two places dispensing with a backing strip, and having sufficient strength. SOLUTION: This steel pipe column is composed of a long size steel pipe 1 having the prescribed plate thickness t, and a short size steel pipe 2 having the plate thickness T thicker than the long size steel pipe 1, and having the length L for forming a panel zone. In the long size steel pipe 1 and the short size steel pipe 2, an outer peripheral shape is formed in the same shape. A step part 3 out-fitted with an end part 1a of the long size steel pipe 1 is formed outside an end part 2a of the short size steel pipe 2. The step part 3 is formed as an inclined face 3a whose outward surface becomes inside toward the end. An end turning surface is formed as a groove surface 3b. A corner part formed of the inclined face 3a and the groove surface 3b is formed as a curved surface 3c. The end part 1a of the long size steel pipe 1 is formed as a groove surface 1b. After fitting the mutual end parts 1a and 2a, the mutual both groove surfaces 1b and 3b are joined by welding 4 from the outside.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art Conventionally, steel pipe columns used as pillars are:
It is configured by welding and joining multiple steel pipes,
At this time, for example, a through-diaphragm system or an inner-diaphragm system is provided as a welding connection.

In the through-diaphragm system, for example, as shown in FIG. 10, a column is cut (divided) into a lower column 21, a panel zone column 22, and an upper column 23 in the longitudinal direction thereof. . Then, a lower diaphragm 24 is provided on the upper end of the lower support 21 via a backing material.
Is welded, and the lower end of the column 22 is welded on the lower diaphragm 24 via a backing material. Further, the upper diaphragm 25 is welded to the upper end of the column 22 via a backing material, and the lower end of the upper support 23 is welded to the upper diaphragm 25 via a backing material.

The connection of the beam flange or the beam member (mainly an H-shaped steel member) 27 to the column 26 thus formed is performed by connecting the free ends of the beam flange or the beam member 27 to both the diaphragms 24 and 25 and the column 22. Were done by welding. The two diaphragms 24 and 25 serve to transmit the stress.

The inner diaphragm system is, for example, shown in FIG.
As shown in FIG. 1, the strut is cut (divided) into a lower strut 31 and an upper strut 32 in its length direction. A diaphragm 33 is welded to the upper portion of the lower support 31 and the lower portion of the upper support 32 via a backing material. The lower support 31 and the upper support 32 are positioned linearly, and their free ends are connected by welding.

The connection of the beam flange or the beam 35 to the column 34 thus formed is performed by connecting the free end of the beam flange or the beam 35 to the upper and lower diaphragms 33 with the lower column 31. This has been done by welding to the outer surface of the upper support 32 by welding.

[0007]

In the conventional structure described above, according to the through-diaphragm system shown in FIG. 10, the column (steel pipe) 26 is cut short and beveled for welding. Diaphragm 24, 2
In No. 5, two upper and lower portions are welded, that is, a total of four portions, so that the number of assembling steps is large and the welding length is long, which complicates the entire operation and increases the manufacturing cost.

Further, according to the inner diaphragm system shown in FIG. 11, the welding of the two diaphragms 33 and the welding of the lower support 31 and the upper support 32 require a total of three weldings. The man-hours are large and the welding length is long, which complicates the whole work and increases the production cost. Further, the diaphragm 33 can be arranged only near the ends of the lower support 31 and the upper support 32, and the beam flange or the material 35 is joined by welding over the welded joint 36 between the lower support 31 and the upper support 32. Therefore, the strut 34 is cut short according to the connection position of the beam flange or the beam member 35, and cannot be formed as a long single strut.

In addition, there is another outer diaphragm system,
According to this, the structure outside the column becomes large and heavy,
Moreover, the welding length is long. Therefore, an object of the present invention is to provide a steel pipe column which can perform a relative positional relationship before welding simply and accurately, and can be welded at two places without using a backing metal, and has sufficient strength. It was done.

[0010]

In order to achieve the above-mentioned object, according to the present invention, a steel pipe column according to a first aspect of the present invention has a long steel pipe having a predetermined plate thickness and a plate thickness larger than the long steel pipe. Consists of a short steel pipe thick and long enough to form a panel zone,
The long steel pipe and the short steel pipe have the same outer peripheral shape, and a step portion is formed outside the end of the short steel pipe so that the end of the long steel pipe can be fitted to the outside. , This step is formed on an inclined surface with its outward surface closer to the end,
The surface facing the end is formed on the groove surface, the corner formed by the inclined surface and the groove surface is formed into a curved surface, the end of the long steel pipe is formed on the groove surface, and the gap between the ends is formed. After the fitting, the two groove faces are connected by welding from the outside.

Therefore, according to the first aspect of the present invention, when the end of the long steel pipe is externally fitted to the step at the end of the short steel pipe,
This can be performed by guiding the inner surface of the end of the long steel pipe at the end by the inclined surface of the step, and the outer fitting is completed when the inner surface of the end becomes dense in the middle of the inclined surface. Furthermore, after fitting the end of the long steel pipe to the step at the end of the short steel pipe, welding is performed over the entire circumference from the outside using the two grooved surfaces. The steel pipe column can be constituted by using the short steel pipe as a panel zone. At this time, the connection by welding can be performed in a state where the end of the short steel pipe is also used as the backing metal, that is, without preparing a separate backing metal.

The long steel pipe and the short steel pipe have the same outer peripheral shape (similar outer dimensions, similar radius of curvature), and the ends can be joined by welding. Moreover, since the corner formed by the inclined surface and the groove surface is formed as a curved surface, stress can be dispersed at this corner. Further, a sufficient strength can be ensured in the panel zone portion by the previously thick plate thickness of the short steel pipe. Moreover, the square steel pipe column is obtained in the form of a pipe joint, and can be finished without built-in ribs or backing metal.

According to a second aspect of the present invention, there is provided a steel pipe column according to the first aspect, wherein an inner surface of an end portion of the short steel tube is formed to have an inclined surface that is closer to the outside. It was done.

Therefore, according to the second aspect of the present invention, the plate thickness of the end of the short steel pipe which is also used as the backing metal at the time of joining by welding can be formed in a narrowed shape by the two inclined surfaces.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
A description will be given based on FIG.

As shown in FIG. 6, a long rectangular steel pipe (long steel pipe) 1 having a predetermined thickness t and a panel zone having a thickness T larger than the thickness t of the long rectangular steel pipe 1 and a panel zone are formed. A short rectangular steel pipe (short steel pipe) 2 having a length (height) L to be formed is prepared. Here, the predetermined thickness t is determined by the outer dimension W of the steel pipe column adopted according to the scale of the steel structure, and for example, when the outer dimension W is 500 mm, the thickness t is 2
5 mm. The plate thickness t of the long rectangular steel pipe 1 and the plate thickness T of the short rectangular steel pipe 2 are, for example, 1.25t to 2t２T. The long rectangular steel pipe 1 and the short rectangular steel pipe 2 have the same outer peripheral shape.

That is, in the case of a square steel pipe having the same outer dimensions (product square steel pipe), the radius of curvature of the corner of a square steel pipe having a large thickness is generally larger than that of a square steel pipe having a small thickness. And its outer peripheral shape is different. Therefore, when a rectangular steel pipe having a small thickness and a rectangular steel pipe having a large thickness are substantially brought into contact with each other and joined by welding, welding of the four sides can be performed without any trouble because the outer dimensions are equal. Cannot be suitably performed because the curvature radius is different and a step is formed.

In order to form the same outer peripheral shape of the long rectangular steel pipe 1 and the short rectangular steel pipe 2, FIG.
Hot forming is performed on a semi-formed short rectangular steel pipe (raw steel pipe) 10 having a large thickness T and a large radius of curvature R shown in FIG.
That is, the semi-formed short rectangular steel pipe 10 having a length L forming a panel zone is heated in a heating means (such as a heating furnace) 15 and hot-formed in a forming means (such as a forming roll device) 16. By hot forming the outer peripheral shape in this manner, a short rectangular steel pipe 2 having a similar outer dimension W, a similar radius of curvature r, and a large plate thickness T with respect to the long rectangular steel pipe 1 is obtained.

Before (or after) such hot forming, outside of the end portion 2a of the short steel pipe 2, as shown in FIGS. End 1a
The step 3 which can be fitted outside is formed. That is, the step 3
The penetration amount A from the outer surface is formed to have the same size (about 25 mm) as the predetermined plate thickness t. And step 3
The outer surface is formed on the inner inclined surface 3a toward the end, the surface facing the end is formed on the groove surface 3b, and the corner formed by the inclined surface 3a and the groove surface 3b is formed on the curved surface 3c. Is formed.

The inclined surface 3a has a penetration amount B of about 30 to 40 mm from the end face thereof. When the end 1a of the elongated rectangular steel pipe 1 is fitted to the outside, the tip of the end 1a and the curved surface are formed. 3c, a welding interval C of about 5 to 7 mm is formed, and a gap S of about 1 to 1.5 mm is formed between the tip of the inclined surface 3a and the inner surface of the elongated rectangular steel pipe 1. I have. The groove surface 3b is formed at a predetermined groove angle Θ ₁ (for example, 25 °). The curved surface 3c has an radius R of about 2 to 5 mm. In addition, a groove surface 1b having a predetermined groove angle Θ ₂ (for example, 35 °) is formed at an end 1a of the elongated rectangular steel pipe 1.

After the short rectangular steel pipe 2 and the long rectangular steel pipe 1 formed as described above are linearly positioned with the same outer peripheral shape, the step 3 of the end 2a of the short steel pipe 2 is formed. The end 1a of the long steel pipe 1 is fitted to the outside. At this time, as shown in FIG. 1, the outer fitting can be easily and smoothly performed by guiding the inner surface of the end 1a of the long steel pipe 1 to the inclined surface 3a of the step 3, and the inner surface of the end is inclined. By forming a dense shape in the middle of the surface 3a, the concentric shape can be automatically obtained with high accuracy.
Accordingly, a welding interval C is generated in the linear direction, and a predetermined welding angle Θ ₃ (for example, 60 °) is formed by the two groove faces 1b and 3b.

In this state, as shown in FIGS. 1 to 5, the opposite end portions 2 a, 1 a of the short rectangular steel pipe 2 and the long rectangular steel pipe 1 are utilized by using both the groove faces 1 b, 3 b. By connecting the spaces by welding 4 over the entire circumference from the outside,
The rectangular steel pipe column (steel pipe column) 5 can be configured by using the short rectangular steel pipe 2 as a panel zone. At this time, the connection by welding 4 is performed in a state where the end 2a of the short rectangular steel pipe 2 is also used as a backing metal.
That is, it can be performed without separately preparing a backing money. The welding 4 to the short rectangular steel pipe 2 is performed including the welding interval C at the end 2a.

The square steel tubular column 5 constructed as described above
A predetermined number is transported to a construction site or the like, and a beam flange or a beam material 6 is joined to the outer surface of the short rectangular steel pipe 2 having a length L forming a panel zone by welding 7. As shown by the imaginary line in FIG. 2, the rectangular steel pipe columns 5 are arranged in a stacked shape, and are connected to each other by welding 4 at the upper and lower sides to have a predetermined length (height).

The rectangular steel tubular column 5 of the first embodiment described above.
According to this, a long steel pipe 1 is provided at a step 3 of an end 2a of a short steel pipe 2.
When the end 1a of the long steel pipe 1 is fitted to the outside, the tip inner surface of the end 1a of the long steel pipe 1 is guided by the inclined surface 3a of the step portion 3, so that the outside fitting work can be performed easily and smoothly. Since the inner surface of the distal end is dense in the middle of the inclined surface 3a, the outer fitting can be automatically made concentric and can be performed with high precision.

Further, by joining the long rectangular steel pipe 1 to both ends 2a of the short rectangular steel pipe 2 by welding 4,
A panel zone can be formed by this short rectangular steel pipe 2. Therefore, the number of parts can be omitted by eliminating the need for a backing metal, and since welding from two locations from the outside is sufficient, the number of assembling steps can be reduced and the welding length can be shortened. And welding distortion or the like hardly occurs.

Further, the long rectangular steel pipe 1 and the short rectangular steel pipe 2 have the same outer peripheral shape (similar outer dimensions W, similar radius of curvature r), and are joined by welding 4 between the ends 1a and 2a. Thus, the welding 4 can be performed sufficiently firmly and neatly. In addition, since the corner formed by the inclined surface 3a and the groove surface 3b is formed in the curved surface 3c, stress can be dispersed at this corner, and welding cracks and the like can be less likely to occur.

Further, in the panel zone, a sufficient strength can be ensured by the thick rectangular thickness T of the short rectangular steel pipe 2 in advance, and the joining of the beam flange or the beam 6 by welding 7 can be performed without any trouble. And the square steel pipe column 5 is obtained in the form of a pipe joint, and can be finished without built-in ribs or backing metal. Therefore, a configuration in which concrete or the like is filled therein can be easily adopted.

In the first embodiment described above, the elongated rectangular steel pipe 1 may be any of a cold-formed one and a hot-formed one. Further, the outer shape of the semi-formed rectangular steel pipe 10 having a large thickness T and a large radius of curvature R is hot-formed so that the long rectangular steel pipe 1 has the same outer dimensions and the same radius of curvature r. A short rectangular steel pipe 2 having a large and thick plate thickness T can be obtained simply and inexpensively. The short rectangular steel pipe 2 and the long rectangular steel pipe 1 have the same outer peripheral shape and are connected by welding 4 between the ends 1a and 2a, so that the connection by the welding 4 is sufficiently strong and clean. be able to.

Next, a second embodiment of the present invention will be described with reference to FIG.
It will be described based on. That is, the inner surface of the end 2a of the short rectangular steel pipe 2 is formed on the inclined surface 2b that is closer to the end. According to this configuration, the plate thickness of the end portion 2a of the short rectangular steel pipe 2 which is also used as a backing metal when joining by welding 4 can be formed in a narrowed shape by the two inclined surfaces 3a and 2b. Then, a short rectangular steel pipe 2 is joined by welding 4.
When the rectangular steel pipe 1 is integrated with the long rectangular steel pipe 1, stress can be smoothly transmitted.

Next, a third embodiment of the present invention will be described with reference to FIG.
It will be described based on. That is, a long round steel pipe (long steel pipe) 1A having a predetermined thickness t and a length (height) having a thickness T larger than the thickness t of the long round steel pipe 1A and forming a panel zone. ) L short round steel pipe (short steel pipe) 2A. Then, the ends 1a, 2a of the long round steel pipe 1A and the short round steel pipe 2A are joined by welding 4 according to the form of the first embodiment or the second embodiment described above. Thus, the round steel pipe column (steel pipe column) 5A can be configured with the short round steel pipe 2A as a panel zone.

The round steel pipe (product round steel pipe) has various outer dimensions (diameter), but the same outer dimensions have the same outer peripheral shape irrespective of the plate thickness. Therefore, according to the third embodiment, the short round steel pipe 2A having a large thickness T is formed in the same outer peripheral shape as the long round steel pipe 1A without performing hot forming or the like. Become.

In each of the above embodiments, as the steel pipe, for example, a one-seam square steel pipe formed by roll forming, a two-seam square steel pipe formed by butt-welding a pair of grooves formed by press forming, and a pair of rolled grooves are welded. Any of the two-seam square steel pipes, two-seam square steel pipes obtained by welding a pair of rolled angle members facing each other, four-sided boxes, seamless steel pipes, etc., are all ready-made steel pipes.

In the above-described embodiment, a square-shaped steel pipe having a square cross section is used as the square steel pipe. However, a steel pipe having a rectangular cross section can also be used. Furthermore, the present invention can be similarly applied to various polygonal steel pipes such as a regular pentagon and a regular hexagon.

In each of the above embodiments, welding is performed by an electroslag welding machine or an electrogas arc welding machine. 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.

[0035]

According to the first aspect of the present invention, when the end of the long steel pipe is externally fitted to the step of the end of the short steel pipe, the inner surface of the tip of the end of the long steel pipe is stepped. The outer fitting operation can be performed easily and smoothly by guiding the vehicle through the inclined surface. Since the inner surface of the distal end becomes dense in the middle of the inclined surface, the outer fitting can be automatically made concentric and accurately performed.

Further, after the end of the long steel pipe is externally fitted to the step at the end of the short steel pipe, the space between the opposite ends is extended over the entire circumference from the outside by using both grooved surfaces. By joining all the pieces by welding, a short steel pipe can be used as a panel zone to form a steel pipe column. At that time, the welding connection can be performed in a state where the end of the short steel pipe is also used as a backing metal, that is, without preparing a separate backing metal, so that the number of parts can be reduced, and moreover, from the outside, Since only welding is required, the number of assembling steps can be reduced and the welding length can be shortened, whereby the whole can be simplified and economical, and welding distortion and the like can be suppressed.

The long steel pipe and the short steel pipe have the same outer peripheral shape and are joined by welding between the ends, so that the joining by welding can be performed sufficiently firmly and neatly. In addition, since the corner formed by the inclined surface and the groove surface is formed as a curved surface, stress can be dispersed at this corner, and welding cracks and the like can be suppressed. In addition, the panel zone can secure sufficient strength by the previously thick plate of short steel pipe,
The joining of the beam members by welding can be performed without any problem. Moreover, the square steel pipe column is obtained in the form of a pipe joint, and can be finished without built-in ribs, backing metal, and the like, and a configuration in which concrete or the like is filled therein can be easily adopted.

According to the second aspect of the present invention,
The length of the short steel pipe, which is also used as a backing metal when joining by welding, can be formed into a narrowed shape by both inclined surfaces, so that the short steel pipe and the long steel pipe are joined by welding. When these are integrated, the stress can be transmitted smoothly.

[Brief description of the drawings]

FIG. 1 shows a first embodiment of the present invention, and is a longitudinal sectional front view of an enlarged main part of a steel pipe column.

FIG. 2 is a vertical sectional front view of the steel pipe column.

FIG. 3 is a partially cutaway perspective view of the steel pipe column.

FIG. 4 is a longitudinal sectional front view of a main part of the steel pipe column.

FIG. 5 is a cross-sectional plan view of the steel pipe column.

FIG. 6 is a partially cutaway perspective view of the steel pipe column before welding connection.

FIG. 7 is an explanatory diagram of hot forming of a short rectangular steel pipe in the steel pipe column.

FIG. 8 shows a second embodiment of the present invention, and is a longitudinal sectional front view of an enlarged main part of a steel pipe column.

FIG. 9 shows a third embodiment of the present invention and is a cross-sectional plan view of a steel pipe column.

FIG. 10 shows a conventional example, and is a partially cutaway perspective view of a steel pipe column.

FIG. 11 shows another conventional example, and is a partially cutaway perspective view of a steel pipe column.

[Explanation of symbols]

Reference Signs List 1 long rectangular steel pipe (long steel pipe) 1A long round steel pipe (long steel pipe) 1a end 1b groove surface 2 short rectangular steel pipe (short steel pipe) 2A short round steel pipe (short steel pipe) 2a end 2b inclined Surface 3 Stepped portion 3a Inclined surface 3b Groove surface 3c Curved surface 4 Welding 5 Square steel tube column (steel tube column) 5A Round steel tube column (steel tube column) 6 Beam flange or beam material A Penetration amount B Inclusion amount of slope 3a C welding Interval D Radius of curved surface 3c S Gap t Length of long steel pipe T Thickness of short steel pipe L Length forming panel zone W External dimension of steel pipe column r Radius of curvature of steel pipe column Θ ₁ groove angle Θ ₂ groove Angle Θ ₃ welding angle

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Isao Nakajima 3-10-11 Kashima, Yodogawa-ku, Osaka City, Osaka Prefecture Inside Nakajima Steel Pipe Co., Ltd. (72) Inventor Norio Nakajima 3-10-10 Kashima, Yodogawa-ku, Osaka City, Osaka No. 111 Nakajima Pipe Co., Ltd. F term (reference) 2E125 AA04 AB15 AC16 AG03 AG34 AG38 CA90 EA33 4E081 AA12 BA27 DA09 FA14 YB08 YX02 YX08 YY01

Claims (2)

[Claims] 1. A long steel pipe having a predetermined thickness and a short steel pipe having a thickness greater than the length of the long steel pipe and forming a panel zone, wherein the long steel pipe and the short steel pipe are: The outer peripheral shape is formed in the same shape, and a step portion to which the end portion of the long steel tube can be fitted is formed outside the end portion of the short steel tube, and the step portion has an outward facing surface. Is formed on the inner inclined surface toward the end, the surface facing the end is formed on the groove surface, the corner formed by the inclined surface and the groove surface is formed as a curved surface, and the end of the long steel pipe is A steel pipe column formed on a groove surface, wherein the two groove surfaces are joined by welding from outside after fitting between end portions. 2. The steel pipe column according to claim 1, wherein an inner surface of an end portion of the short steel pipe is formed on an inclined surface that is closer to the outer end.