JP2002213018A - Steel pipe column - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a steel pipe column capable of being welded in two sections without necessitating a backing metal and having sufficient strength. SOLUTION: This steel pipe column consists of a long steel pipe 1 having a predetermined plate thickness t and a short steel pipe 2 having a larger plate thickness T than the plate thickness t of the long steel pipe 1, forming a panel zone, and having a length L. Outer peripheral shapes of the long steel pipe 1 and the short steel pipe 2 are the same. A stepped part 2b in which an end part 1a of the long steel pipe 1 can be externally fitted is formed on an outer side of an end part 2a of the short steel pipe 2, and externally fitted end parts 1a, 2a are connected by welding 3 from the outer side. Since the end parts 1a, 2a are connected by welding 3 over whole periphery from the outer side after fitting the end part 1a of the long steel pipe 1 into the stepped part 2b of the short steel pipe 2 externally, the steel pipe column 5 is constituted using the short steel pipe 2 as the panel zone. The connection of them by welding 3 can be performed without preparing the backing metal separately by utilizing the end part 2a of the short steel pipe 2 as the backing metal.

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, as shown in FIG. 16, for example, 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. 7, the column is cut (divided) into a lower column 31 and an upper column 32 in the 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. 16, 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. 17, 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 material 35, and cannot be formed into a long, single, true 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. Accordingly, an object of the present invention is to provide a steel pipe column which can be welded at two places without using a backing metal and has sufficient strength.

[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. , And the outer fitted ends are connected by welding from the outside.

Therefore, according to the first aspect of the present invention, after the end of the long steel pipe is externally fitted to the step at the end of the short steel pipe,
By joining the opposite ends (end faces) by welding over the entire circumference from the outside, a steel pipe column can be configured with a 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. 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 a notch is formed inside an end of the short steel pipe. .

Therefore, according to the second aspect of the present invention, the end portion of the short rectangular steel pipe which is also used as a backing metal when joining by welding can be formed thinly, and the notch phenomenon causes, for example, the short steel pipe. Even if the plate thickness is large, it is possible to perform welding without generating cracks.

[0015] The steel pipe column according to claim 3 of the present invention comprises:
The structure according to claim 1 or 2, wherein the step portion has a surface facing the end formed at the groove portion, and the end portion of the long steel pipe is also formed at the groove portion. .

Therefore, according to the third aspect of the present invention, the ends can be joined by welding the two groove portions from the outside.

[0017]

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, an elongated rectangular steel pipe (elongated steel pipe) 1 having a predetermined thickness t, a thickness T larger than the thickness t of the elongated rectangular steel pipe 1 and a panel zone are defined. And a short rectangular steel pipe (short steel pipe) 2 having a length (height) L to be formed. 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 25.
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, 2t ≒ T. 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 rectangular steel pipes having the same outer dimensions (product square steel pipes), the radius of curvature of the corners of a square steel pipe having a large thickness is generally larger than the radius of curvature of the corners 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.

On the other hand, in the first embodiment of the present invention, in order to form the outer peripheral shape of the long rectangular steel pipe 1 and the short rectangular steel pipe 2 in the same shape, the thick plate thickness T shown in FIG. -Formed short rectangular steel pipe (raw steel pipe) 1 having a large radius of curvature R
The hot forming is performed on 0. 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 the end 2a of the short rectangular steel pipe 2,
A step 2b is formed to which the end of the long rectangular steel pipe 1 can be fitted. That is, the step portion 2b has a penetration amount A from the outer surface.
Are formed to have the same size (about 25 mm) as the predetermined plate thickness t, and the amount of penetration B from the end face is slightly longer (25 mm or more). And the end 1a of the long rectangular steel pipe 1
Is formed with a groove portion 1b having a predetermined groove angle Θ ₁ (for example, 35 °).

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, a step portion at the end 2a of the short rectangular steel pipe 2 is formed. The end 1a of the long rectangular steel pipe 1 is externally fitted to 2b. Here, the outer fitting is the gap S (about 6 mm) in the linear direction.
This is performed in a state in which Then, as shown in FIGS. 1 to 5, the gap between the opposed end portions 2 a and 1 a (end face) of the short rectangular steel pipe 2 and the long rectangular steel pipe 1 is utilized from outside by using the groove 1 b. By joining by welding 3 over the entire circumference,
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 the welding 3 can be performed in a state where the end 2a of the short rectangular steel pipe 2 is also used as a backing metal, that is, without preparing a separate backing metal. The welding 3 to the short rectangular steel pipe 2 side includes the stepped portion 2b including the end portion 2a.
Is performed on the portion that forms

The rectangular steel tube 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 phantom line in FIG. 1, the rectangular steel pipe columns 5 are arranged in a stacked shape, and are connected to each other by welding 3 between the upper and lower portions to have a predetermined length (height).

The rectangular steel tubular column 5 of the first embodiment described above.
According to this, by connecting the long rectangular steel pipe 1 to both ends 2a of the short rectangular steel pipe 2 by welding 3, a panel zone can be formed by the short rectangular steel pipe 2. Therefore, the backing metal is unnecessary, the number of parts can be omitted, and the work of welding the backing metal can be omitted.Moreover, since welding can be performed at two places from the outside, the number of assembly steps can be reduced and the welding length can be reduced. As a result, the entire structure is simplified and economical, and welding distortion and the like are less likely to occur.

A long rectangular steel pipe 1 and a short rectangular steel pipe 2
And the same material 3 can be used to easily perform homogeneous welding 3. In addition, the externally fitted welding 3 becomes a close-fitting and unmistakable welding 3, ensuring a highly accurate route interval. obtain.

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 3 between the ends 1a and 2a. Thus, the welding 3 can be performed sufficiently firmly and neatly.

Further, in the panel zone, sufficient strength can be ensured by the previously thick plate thickness T of the short rectangular steel pipe 2, 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 long rectangular steel pipe 1 is formed by cold forming, hot forming,
Any of these may be used. 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 between the ends 1a and 2a by welding 3, so that the connection by welding 3 is sufficiently strong and clean. be able to.

Next, a second embodiment of the present invention will be described with reference to FIGS. That is, the notch 2 c is formed inside the end 2 a of the short rectangular steel pipe 2. At this time, the notch 2c has an inclination angle Θ _{2 of about} 4
The end 2a can be formed thin (for example, about 9 mm) through the 5 ° inclined surface 2d.

According to the second embodiment, the end 2a of the short rectangular steel pipe 2 which is also used as a backing metal when joining by welding 3 can be formed thin, and the notch phenomenon is caused. Even if the plate thickness T of the short rectangular steel pipe 2 is large, the welding 3 that does not cause cracks can be performed.

Next, a third embodiment of the present invention will be described with reference to FIG.
Description will be made based on 0. 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 3 according to the above-described first embodiment or the second embodiment. Thus, a round steel pipe column (steel pipe column) 5A can be configured with the short round steel pipe 2A as a panel zone.

Round steel pipes (product round steel pipes) have various external dimensions (diameters), but those having the same external dimensions have the same outer peripheral shape regardless 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.

Next, a fourth embodiment of the present invention will be described with reference to FIG.
1 will be described. That is, the semi-formed short rectangular steel pipe 10 having a large thickness T and a large radius of curvature R described in the first embodiment, and a half-shaped rectangular steel tube 10 having a small thickness t and a large radius of curvature R similarly. A formed long rectangular steel pipe 11 is prepared. At this time, the semi-formed short rectangular steel pipe 10 and the semi-formed long rectangular steel pipe 11 are both semi-formed as slightly longer outer dimensions W + α.

The semi-formed short rectangular steel pipe 10 and the semi-formed long rectangular steel pipe 11 are positioned linearly with the same outer peripheral shape. And the semi-formed short rectangular steel pipe 10
Between the end portions of the semi-formed elongated rectangular steel pipe 11 and the first
According to the embodiment or the form of the second embodiment, the semi-formed rectangular steel pipe 10 is formed as a panel zone using the semi-formed short rectangular steel pipe 10 as a panel zone by joining by welding 3.

Next, hot forming is performed on the semi-formed square steel pipe column 12. That is, the semi-formed square steel pipe column 12 is heated by the heating means 15 and is hot-formed (hot drawn) by the forming means 16. By hot forming the outer peripheral shape in this way, the desired outer dimension W can be obtained over the entire length.
, And each corner has a similar radius of curvature r, and the panel zone is a square steel tube column 5 having a large thickness T.

According to the fourth embodiment, the welding is integrated with the base material (short rectangular steel pipe or long rectangular steel pipe) by performing the hot forming after the connection by the welding 3 is performed. It has excellent deformation performance and can prevent brittle fracture.

The fourth embodiment described above can also be adopted when a round steel pipe column 5A is obtained by using a semi-formed short round steel pipe and a semi-formed long round steel pipe. Next, a fifth embodiment of the present invention will be described with reference to FIG. That is, this is a modification of the above-described first embodiment, and the stepped portion 2b has a surface facing the end formed at a groove portion 2e having a predetermined groove angle Θ ₃ (for example, 35 °). The inner ends of the groove portion 2e and the groove portion 1b of the elongated rectangular steel pipe 1 are parallel to each other and have an end surface 1 having a small thickness (about 2 mm).
f, 2f, and in a state where the gap S is formed between the end surfaces 1f, 2f, the two groove portions 2e, 1b are joined by welding 3 from outside.

Next, a sixth embodiment of the present invention will be described with reference to FIG.
Description will be made based on 3 (a). That is, the fifth
In the modification of the embodiment, the inclined surface 2d shown in the second embodiment is provided inside the end 2a of the short rectangular steel pipe 2.
The cutout (step-like portion) 2g in which no is present is formed.

Next, a seventh embodiment of the present invention will be described with reference to FIG.
Explanation will be given based on 3 (b). That is, the second
In the modification of the embodiment, the inclined surface 2d shown in the second embodiment is provided inside the end 2a of the short rectangular steel pipe 2.
The cutout (step-like portion) 2g in which no is present is formed.

Next, an eighth embodiment of the present invention will be described with reference to FIG.
4 (a) will be described. That is, the fifth
This is a modification of the sixth embodiment and the sixth embodiment, in which an inclined surface 2 h is formed inside an end 2 a of the short rectangular steel pipe 2.

Next, a ninth embodiment of the present invention will be described with reference to FIG.
4 (b). That is, the first
This is a modification of the embodiment and the second embodiment, in which an inclined surface 2 h is formed inside an end 2 a of the short rectangular steel pipe 2.

Next, a tenth embodiment of the present invention will be described with reference to FIG. That is, this is a modification of the fifth embodiment described above, in which the groove 2i is formed inside the end 2a of the short rectangular steel pipe 2.

Next, an eleventh embodiment of the present invention will be described with reference to FIG. That is, this is a modification of the first embodiment described above, in which the groove 2i is formed inside the end 2a of the short rectangular steel pipe 2.

In the above-mentioned fifth to eleventh embodiments, the case of the rectangular steel pipe column 5 composed of the short rectangular steel pipe 2 and the long rectangular steel pipe 1 has been described. The same applies to the case of a round steel pipe column 5A made of a shaped steel pipe 1A.

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-described 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.

[0049]

According to the first aspect of the present invention, after the end of the long steel pipe is fitted to the step of the end of the short steel pipe, the space between the opposed ends is completely reduced from the outside. By joining by welding over the circumference, a steel pipe column can be configured with a short steel pipe as a panel zone. At that time, the connection by welding is performed in a state where the end of the short steel pipe is also used as a backing metal, that is,
Can be done without having to prepare a separate backing,
Since the number of parts can be omitted and the work of welding the backing metal can be omitted, and only welding from the outside is required,
The welding man-hour can be shortened while the assembly man-hour can be reduced.
Thus, the entire structure can be simplified to be economical, and can be made less likely to cause welding distortion and the like.

Further, since the long steel pipe and the short steel pipe are made of the same material, uniform welding can be easily performed. And a highly accurate route interval can be secured.

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. Furthermore, sufficient strength can be secured in the panel zone by the previously thick plate of the short steel pipe, and the joining by beam welding can be performed without any trouble. 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,
When the joint is formed by welding, the end of the short rectangular steel pipe which is also used as the backing metal can be formed thin, so that the notch phenomenon causes the short steel pipe to always crack even if it is thick. It is possible to perform suitable welding without generation of cracks.

According to the third aspect of the present invention, by welding the two groove portions from the outside, the connection between the end portions can be sufficiently performed.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional front view of a steel pipe column, showing a first embodiment of the present invention.

FIG. 2 is a partially cutaway perspective view of the steel pipe column.

FIG. 3 is a longitudinal sectional front view of a main part of the steel pipe column.

FIG. 4 is a longitudinal sectional front view of an enlarged 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 the second embodiment of the present invention, and is a longitudinal sectional front view of a main part of a steel pipe column.

FIG. 9 is a longitudinal sectional front view of an enlarged main part of the steel pipe column.

FIG. 10 shows a third embodiment of the present invention and is a cross-sectional plan view of a steel pipe column.

FIG. 11 shows the fourth embodiment of the present invention and is an explanatory view of hot forming in a steel pipe column.

FIG. 12 shows the fifth embodiment of the present invention, and is a longitudinal sectional front view of a main part of a steel pipe column.

13A and 13B show another embodiment of the present invention, in which FIG. 13A is a longitudinal sectional front view of a main part of a steel pipe column showing a sixth embodiment,
(B) is a longitudinal front view of the main part of the steel pipe column which shows 7th Embodiment.

14A and 14B show another embodiment of the present invention, and FIG. 14A is a longitudinal sectional front view of a main part of a steel pipe column showing an eighth embodiment;
(B) is a longitudinal section front view of an important section of a steel pipe column showing a ninth embodiment.

15A and 15B show another embodiment of the present invention, and FIG. 15A is a longitudinal sectional front view of a main part of a steel pipe column showing a tenth embodiment;
(B) is a vertical front view of the principal part of the steel pipe column which shows 11th Embodiment.

FIG. 16 shows a conventional example, and is a partially cutaway perspective view of a steel pipe column.

FIG. 17 is a partially cutaway perspective view of a steel pipe column showing another conventional example.

[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 2 short rectangular steel pipe (short steel pipe) 2A short round steel pipe (short steel pipe) 2a end 2b step Part 2c Notch 2e Groove 2g Notch 2h Slope 2i Groove 3 Welding 5 Square steel pipe column (steel pipe column) 5A Round steel pipe column (steel pipe column) 6 Beam flange or beam material 10 Semi-formed short rectangular steel pipe ( (Semi-formed short steel pipe) 11 Semi-formed long rectangular steel pipe 12 Semi-formed rectangular steel pipe column 15 Heating means 16 Forming means t Plate thickness of long steel pipe T Plate thickness of short steel pipe L Length forming panel zone W Outside of steel pipe column Dimension R Curvature radius of semi-formed square steel pipe 10 r Curvature radius of steel pipe column Θ ₁ Groove angle Θ ₂ Incline angle Θ ₃ Groove angle S Gap

 ──────────────────────────────────────────────────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 Kokan Co., Ltd. F term (reference) 2E125 AA04 AB16 AB17 AC16 AG03 AG38 CA90 EA33 2E163 DA00 FA02 FB09 FB22 FB46

Claims (3)

[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 of the long steel pipe can be externally fitted is formed outside the end of the short steel pipe. A steel pipe column characterized by being connected by welding. 2. The steel pipe column according to claim 1, wherein a notch is formed inside an end of the short steel pipe. 3. The step portion has a surface facing the end formed at a groove portion,
3. The steel pipe column according to claim 1, wherein an end of the long steel pipe is also formed at a groove.