JP3801586B2 - Manufacturing method of square steel pipe column - Google Patents

Description

The present invention relates to a method of manufacturing a rectangular steel pipe column used as a column of a steel structure, for example.

Conventionally, as a method of attaching a diaphragm to the support column side, for example, a through diaphragm method and an inner diaphragm method have been provided.
Of these, in the through diaphragm system, as shown in FIG. 5 , for example, the support column is cut (divided) into a lower support column 31, a panel zone column 32, and an upper support column 33 in the length direction. The lower diaphragm 34 is welded to the upper end of the lower column 31 via a backing material, and the lower end of the column 32 is welded to the lower diaphragm 34 via the backing material. Further, the upper diaphragm 35 is welded to the upper end of the column 32 via a backing material, and the lower end of the upper column 33 is welded to the upper diaphragm 35 via the backing material.

  The beam material (mainly H-shaped steel material) 37 is connected to the column 36 formed in this way by welding the free ends of the beam material 37 to both the diaphragms 34 and 35 and the column 32. Both diaphragms 34 and 35 served to transmit stress.

In the inner diaphragm system, for example, as shown in FIG. 6 , the support column is cut (divided) into a lower support column 41 and an upper support column 42 in the length direction. A diaphragm 43 is welded to the upper portion of the lower support column 41 and the lower portion of the upper support column 42 via a backing material. After these lower support column 41 and upper support column 42 are positioned in a straight line, their free ends are joined by welding.

The beam member 45 is connected to the column 44 formed in this manner by welding and joining the outer surface of the lower column 41 and the upper column 42 with the free end of the beam member 45 facing the upper and lower diaphragms 43. It was done by doing.
JP-A-8-302899 JP 62-248731 A Japanese Patent Laid-Open No. 11-731

In the conventional configuration described above, according to the through-diaphragm system shown in FIG. 5 , the strut (steel pipe) 36 is cut short and grooved for welding, and both diaphragms 34 and 35 are respectively connected to the upper and lower sides. Since the welding is performed at two locations, that is, a total of four locations, the number of assembling steps is increased and the welding length is increased, which complicates the overall operation and increases the production cost.

Further, according to the inner diaphragm system shown in FIG. 6 , since a total of three places of welding of each of the diaphragms 43 and welding of the lower support column 41 and the upper support column 42 are required, the assembly man-hour is large. In addition, the welding length becomes long, which complicates the whole operation and increases the production cost. Furthermore, the diaphragm 43 can be disposed only near the end portions of the lower support column 41 and the upper support column 42, and the beam member 45 is welded and joined across the welded joint portion 46 between the lower support column 41 and the upper support column 42. The struts 44 were cut short according to the connection positions of the beam members 45, and could not be made into a single long strut.

In addition, there is another outer diaphragm system, but according to this, the structure outside the column becomes large and heavy, and the weld length is long.
Accordingly, the invention according to claim 1 of the present invention is a rectangular steel pipe column that can reduce the number of welds but does not cause deformation such as the curvature radius of each corner portion being uniform and the butt weld portion being inclined. The object of the present invention is to provide a method of manufacturing a rectangular steel pipe column that can be obtained.

In order to achieve the above-described object, a method for manufacturing a rectangular steel pipe column according to claim 1 of the present invention includes a semi-formed long rectangular steel pipe having a predetermined thickness, and a plate thickness larger than that of the semi-formed long rectangular steel pipe. Semi-formed short rectangular steel pipes that are thick and long enough to form a beam connecting part are prepared , and these semi-formed long rectangular steel pipes and semi-formed short square steel pipes each have a butt weld formed on at least one flat plate part. In addition, the corner portion is formed to have a radius of curvature larger than the radius of curvature of the final product. These semi-formed long rectangular steel pipes and semi-formed short square steel pipes are connected to the beam by connecting the semi-formed short square steel pipes. It is characterized by forming a semi-formed square steel pipe column by welding in the length direction as a position, heating this semi-formed square steel pipe column, and then hot forming so that the radius of curvature of each corner is uniform over the entire length. It is what.

Therefore, according to the invention of claim 1, by performing hot forming on a semi-formed square steel pipe column that has been welded , the curvature of each corner portion can be increased over the entire length while the beam connection position is made thick. A square steel pipe column with a uniform radius and a homogenized flat plate and corner can be manufactured. Welding is integrated with the base material (semi-formed steel tube column), and it is particularly excellent in plastic deformation performance, leading to brittle fracture. Can be prevented. And the square steel pipe column which a deformation | transformation does not produce, such as a butt-weld part not inclining but remaining linear can be manufactured.

According to the first aspect of the present invention described above, the beam connecting position can be increased by performing hot forming on the semi-formed square steel pipe column that has been welded and joined while reducing the number of welds. However, the radius of curvature of each corner can be made uniform over the entire length, and a square steel pipe column with a uniform flat plate and corner can be manufactured, and welding is integrated with the base material (half-formed steel pipe column). In particular, it is possible to manufacture a rectangular steel pipe column that is excellent in plastic deformation performance, can prevent brittle fracture, and that does not deform such that the butt weld is not inclined and remains linear.

[Embodiment 1]
Below, Embodiment 1 of this invention is demonstrated based on FIGS. 1-4 as the state which employ | adopted the square-shaped square steel pipe.

That is, as shown in FIG. 2, thicker thickness T a and semi-molded short rectangular steel tube 20 which is molded to the curvature radius R is larger each corner portion, thinner thickness t a and the large curvature respective corner portions similarly It formed into a radius R and semi-molded elongate rectangular steel tube 21 is prepared. At that time, the semi-formed short square steel pipe 20 and the semi-formed long square steel pipe 21 have butt welds 20a and 21a formed by butt welding on one flat plate portion, and have a slightly longer outer dimension W + α. Semi-molded.

  In other words, the semi-formed short square steel pipe 20 and the semi-formed long square steel pipe 21 have each corner portion having a large curvature radius R and a slightly longer outer dimension W + α, so that the outer peripheral shape is the final product shape (square steel pipe). It is larger than the column and is formed in the same shape. Here, the predetermined thickness t is determined by the outer dimension W of the steel pipe column employed according to the scale of the steel structure. For example, when the outer dimension W is 600 mm, the thickness t is 25 mm. is there. Further, the plate thickness t of the semi-formed long rectangular steel tube 21 and the plate thickness T of the semi-formed short rectangular steel tube 20 are set to 2t≈T, for example. Further, the semi-formed short square steel pipe 20 has a length (height) L that forms a beam member connecting portion.

The semi-formed short square steel pipe 20 and the semi-formed long square steel pipe 21 are positioned so that their outer peripheral shapes are the same, and the butt welds 20a, 21a are positioned in the same straight line. Then, as shown in FIG. 1 and FIG. 3 (a), the semi-formed short square steel pipe 20 and the semi-formed long square steel pipe 21 are welded to each other so that the semi-formed short square steel pipe 20 is beamed. A semi-formed square steel pipe column 23 is configured as a material connection position.

  Next, hot forming (shaping) is performed on the semi-formed square steel pipe column 23. That is, the semi-formed square steel pipe column 23 is heated by the heating means 25 and hot-formed (hot drawn) by the forming means 26. By hot forming the outer peripheral shape in this way, as shown in FIGS. 1 and 3 (b), the desired outer dimension W is provided over the entire length, and each corner has the same curvature radius r, As a result, a square steel pipe column (steel pipe column) 24 having a thick plate thickness T at which the beam material connection position is thick, that is, a square steel tube column 24 whose outer shape is the final product shape is obtained.

  According to the first embodiment, the welding is integrated with the base material (semi-formed short rectangular steel pipe or semi-formed long rectangular steel pipe) by performing hot forming after performing the welding connection 22, and particularly plastic deformation performance. And can prevent brittle fracture.

  And by performing hot forming with respect to the semi-formed square steel pipe column 23, the curvature radius r of each corner part is made uniform in the entire length, and the butt welds 20a and 21a remain straight without being inclined. A square steel pipe column 24 that does not deform can be manufactured. Furthermore, the square steel pipe column 24 in which the flat plate portion and the corner portion are homogenized can be manufactured by hot forming.

  In the first embodiment described above, the semi-formed short rectangular steel pipe 20 and the semi-formed long rectangular steel pipe 21 are obtained by press-forming a steel plate and then butt-welding, or by bending a steel plate and then butt-welding. Thus, after forming a round steel pipe, this round steel pipe is obtained by molding by a press method or a roll method.

A predetermined number of such square steel pipe columns 24 are transported to a construction site or the like, and as shown in FIG. 4, the beam material 6 is welded to the outer surface of the thick plate portion having a length L that forms the beam material connecting portion. Connected by a bond 7. At that time, the beam connecting portion can secure a sufficient strength by the thick plate thickness T in advance, and the welding connection 7 of the beam 6 can be performed without any trouble. The square steel pipe column 24 is obtained in the form of a pipe joint and can be finished without a built-in rib or backing metal. Therefore, a configuration in which concrete or the like is filled therein can be easily adopted .

  In the above-described embodiment, as the steel pipe, for example, a one-seam rectangular steel pipe formed by roll forming, a two-seam rectangular steel pipe formed by facing and welding a pair of groove-shaped members formed by press forming, and a pair of rolled groove-shaped members are welded. A ready-made steel pipe, such as a two-seam square steel pipe and a two-seam square steel pipe obtained by welding a pair of rolled chevron members facing each other, is appropriately used.

  In the above-described embodiment, a square steel pipe having a square shape in cross section is adopted as the square steel pipe, but a steel pipe having a rectangular shape in cross section can also be adopted. Furthermore, it can be similarly applied to various polygonal steel pipes such as regular pentagons and regular hexagons.

  In the above-described embodiment, 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. Other welding methods such as laser may be used.

BRIEF DESCRIPTION OF THE DRAWINGS It is process explanatory drawing in the manufacturing method of the square steel pipe column which shows Embodiment 1 of this invention. It is a partially cutaway perspective view before welding joining of the half-formed square steel pipe column in the manufacturing method of the same square steel pipe column. It is explanatory drawing of the manufacturing method of the same square steel pipe column, (a) is a cross-sectional plan view of a semi-formed square steel pipe column, (b) is a cross-sectional plan view of a square steel pipe column. It is a partially cutaway perspective view of the same square steel pipe column. It is a partially cutaway perspective view of a square steel pipe column showing a conventional example . It is a partially cutaway perspective view of a square steel pipe column showing another conventional example.

Explanation of symbols

6 Beam material 20 Semi-formed short square steel pipe 20a Butt weld 21 Semi-formed long square steel pipe 21a Butt weld 22 Weld joint 23 Semi-formed square steel pipe column 24 Square steel pipe column 25 Heating means 26 Forming means t Long square steel pipe plate the length W RHS column outer size W + alpha semi-molded RHS column outer size R half molding RHS curvature radius of the curvature radius r RHS column of forming the plate thickness L beam members connecting portion of the thickness T short RHS

Claims (1)

A semi-formed long rectangular steel pipe having a predetermined plate thickness and a semi-formed short rectangular steel pipe having a thickness that is thicker than the semi-formed long square steel pipe and forming a beam connecting portion are prepared. Each of the long square steel pipe and the semi-formed short square steel pipe has a butt weld portion formed on at least one flat plate portion, and its corner portion is formed with a curvature radius larger than the curvature radius of the final product, These semi-formed long square steel pipes and semi-formed short square steel pipes are welded and joined in the longitudinal direction with the semi-formed short square steel pipe as a beam connecting position to form a semi-formed square steel pipe column. After the steel is heated, it is hot-formed so that the radius of curvature of each corner portion is uniform over the entire length thereof.

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