JP3675691B2 - Steel pipe column manufacturing method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for manufacturing a steel pipe column used as a column of a steel structure, for example, and a steel pipe column.
[0002]
[Prior art]
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.
[0003]
Among these, in the through diaphragm method, as shown in FIG. 9, for example, the column is cut (divided) into a lower column 31, a panel zone column 32, and an upper 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.
[0004]
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.
[0005]
In the inner diaphragm system, for example, as shown in FIG. 10, 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.
[0006]
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.
[0007]
[Problems to be solved by the invention]
In the conventional configuration described above, according to the through-diaphragm system shown in FIG. 9, 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.
[0008]
Further, according to the inner diaphragm system shown in FIG. 10, a total of three points of welding of each of the diaphragms 43 and the welding of the lower column 41 and the upper column 42 are necessary. 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.
[0009]
Furthermore, in both types, due to the presence of the diaphragms 34 and 35 and the diaphragm 43, it is not easy to fill the concrete for strength and fire resistance. The filled concrete is deformed when the columns 36 and 44 are shaken by wind or the like, and is easily peeled off from the inner surfaces of the lower column 31, the column 32, the upper column 33, the lower column 41, and the upper column 42. Thus, the desired strength and fire resistance are not fully exhibited.
[0010]
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.
Therefore, the invention according to claim 1 of the present invention is shaped such that the outer peripheral shape is shaped over its entire length, the butt weld is not inclined, and each weld can be integrated with the base material. An object of the present invention is to provide a method of manufacturing a steel pipe column that can be filled with concrete without peeling off.
[0012]
[Means for Solving the Problems]
In order to achieve the first object described above, a method of manufacturing a steel pipe column according to claim 1 of the present invention includes a semi-formed long steel pipe having a predetermined plate thickness, and a plate more than the semi-formed long steel pipe. A semi-formed short steel pipe having a thickness that forms a beam connecting portion, and a projection group is welded to the inner surface of the semi-formed short steel pipe, and the semi-formed long steel pipe and the semi-formed short steel pipe Means that a butt weld is formed by butt welding in at least one place in the circumferential direction, and the outer peripheral shape is larger than the final product shape and is formed in the same shape. These semi-formed long steel pipes and a semi-molded short steel pipe, the semi-molded short steel pipe and welded together in the longitudinal direction as a beam member connecting position to form a semi-molded tubular columns, after heating in the heating means of this semi-molded tubular columns, the outer peripheral shape All the molding means so but a final product shape Be hot formed Te is obtained by it said.
[0013]
Therefore, according to the invention of claim 1, by performing hot forming in the forming means on the semi-formed steel tube column heated in the heating means, it is possible to manufacture a steel tube column whose outer shape is shaped over its entire length. In addition, by hot forming, it is possible to produce a homogenized steel pipe column, each weld is integrated with the base material, the projections are firmly bonded, and the plastic deformation performance is excellent, so that brittle fracture is obviated. Can be prevented.
[0014]
According to a second aspect of the present invention, there is provided a method of manufacturing a steel pipe column in which the semi-formed long square steel pipe and the semi-formed short square steel pipe are used in the configuration described in the first aspect. And the semi-formed short square steel pipe are formed with a radius of curvature larger than the radius of curvature of the final product. After the semi-formed square steel pipe column formed by welding is heated by the heating means , the corner Is characterized in that hot forming is performed in the forming means so as to be the radius of curvature of the final product.
[0015]
Therefore, according to the invention of claim 2, by performing hot forming on the semi-formed square steel pipe column which has been welded, the curvature radius of each corner portion is made uniform over the entire length, and the flat plate portion and the corner portion are A homogenized square steel pipe column can be produced. Further butt deformation such as weld remains straight without inclination that obtained by preparing RHS Column not occur.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Below, the 1st Embodiment of this invention is described based on FIGS. 1-8 as the state which employ | adopted the square square steel pipe.
[0019]
As shown in FIG. 1 and FIG. 2, a semi-formed long rectangular steel pipe (semi-formed long steel pipe) 1 having a predetermined plate thickness t and each corner portion formed into a large curvature radius R, and this half-formed length A semi-formed short square steel pipe (semi-formed short steel pipe) 2 having a thickness T larger than the thickness t of the square steel pipe 1 and a corner radius of curvature R which is similarly large is prepared.
[0020]
At that time, the semi-formed long square steel pipe 1 and the semi-formed short square steel pipe 2 have butt welds 1a and 2a formed by butt welding on one flat plate portion, and have a slightly longer outer dimension W + α. Semi-molded. Further, the semi-formed short square steel pipe 2 has a length (height) L that forms a beam connecting portion.
[0021]
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 pipe 1 and the plate thickness T of the semi-formed short square steel pipe 2 are set to 2t≈T, for example. The semi-formed long square steel pipe 1 and the semi-formed short square steel pipe 2 have each corner portion having a large radius of curvature 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.
[0022]
A group of protrusions 3 are welded 4 to the inner surface 2 b of the semi-formed short square steel pipe 2. Here, a T-bolt shape is used as the protrusion 3, and at this time, the interval (gap) S between the protrusions 3, the interval S between the inner surface 2 b and the protrusion-opposing surface, etc. It is set to allow objects (up to about 50mm) to enter.
The semi-formed long rectangular steel pipe 1 and the semi-formed short rectangular steel pipe 2 are positioned so that their outer peripheral shapes are the same, and the butt welds 1a and 2a are the same straight line. Then, by joining the equivalent contact between the semi-formed long rectangular steel pipe 1 and the semi-formed short square steel pipe 2 as shown in FIG. 3 and FIG. A semi-formed square steel pipe column (semi-formed steel pipe column) 7 is configured as a beam connecting position.
[0023]
Here, step portions 2 c for adjusting the thickness to the thickness t of the semi-formed long square steel pipe 1 are formed on the inner surfaces at both ends of the semi-formed short square steel pipe 2. And when constructing the welding joint 5, the ring-shaped flat bar 6 is set as needed inside the welding location using the step 2c (see FIG. 7). When the flat bar 6 is not used, welding connection from the inside and outside is employed.
[0024]
Next, hot forming (shaping) is performed on the semi-formed square steel pipe column (raw steel pipe) 7 having a large curvature radius R. That is, the semi-formed square steel pipe column 7 is heated by the heating means (heating furnace or the like) 15 and hot-formed (hot drawing) by the forming means (formation roll device or the like) 16.
[0025]
By hot forming the outer peripheral shape in this way, as shown in FIG. 3 and FIG. 4 (b), the desired outer dimension W over the entire length, and each corner has a similar curvature radius r, Then, a long rectangular steel pipe (long steel pipe) 1A having a predetermined thickness t, and a short rectangular steel pipe (short steel pipe) 2A having a beam member connecting portion having a thick plate thickness T and having three protrusions on the inner surface are provided. A rectangular steel pipe column (steel pipe column) 10 formed by welding connection 5 in the length direction, that is, a rectangular steel pipe column 10 having an outer peripheral shape as a final product shape is obtained.
[0026]
A predetermined number of such square steel pipe columns 10 are transported to a construction site or the like, and, as shown in FIGS. 5 to 7, on the outer surface of the short square steel pipe 2 </ b> A having a length L that forms a beam material connecting portion, The material 11 is connected by a weld joint 12. In addition, as shown in the phantom line of FIG. 5, the square steel pipe column 10 is arrange | positioned in a pile-up form, and is comprised by predetermined length (height) by the welding coupling 12 between the upper and lower sides. And before and after stacking welding, the concrete 13 is filled in the square steel pipe column 10.
[0027]
Therefore, the square steel pipe column 10 can cope with strength and fire resistance by filling the concrete 13 therein. At that time, in the beam member connecting portion, the concrete 13 is sufficiently filled up to the inner surface 2b through the interval (gap) S between the protrusions 3 and the interval S between the inner surface 2b and the protrusion opposing surface.
[0028]
According to the manufacturing method of the square steel pipe column 10 described above, the semi-formed long square steel pipe 1 is welded and bonded to both ends of the semi-formed short square steel pipe 2 to form a beam connecting portion by the semi-formed short square steel pipe 2A. Can do. Therefore, since it is sufficient to weld at two locations, the number of assembling steps can be reduced, and the welding length is shortened. Therefore, the whole is simplified and economical, and welding distortion is hardly generated.
[0029]
Further, the semi-formed long rectangular steel pipe 1 and the semi-formed short rectangular steel pipe 2 have the same outer peripheral shape (similar slightly longer outer dimension W + α, similar large curvature radius R) in the longitudinal direction. By making the welded connection 5, the welded connection 5 can be made sufficiently strong and clean.
[0030]
And by carrying out hot forming with respect to the semi-formed square steel pipe column 7, the curvature radius r of each corner part is aligned in the entire length, and the butt welds 1a and 2a remain straight without being inclined. A square steel pipe column 10 that does not deform can be manufactured. Furthermore, a square steel pipe column 10 in which the flat plate portion and the corner portion are homogenized can be manufactured by hot forming, and each weld (1a, 2a, 4, 5) is made of a base material (half-formed short square steel pipe or half-formed length). And the projections 3 can be firmly bonded, and the plastic deformation performance is excellent, so that brittle fracture can be prevented in advance.
[0031]
Further, the beam member connecting portion can ensure sufficient strength by the thick plate thickness T in advance, and the welding connection 12 of the beam member 11 can be performed without any trouble. The square steel pipe column 10 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 the concrete 13 is filled therein can be easily adopted.
[0032]
And the square steel pipe pillar 10 can cope with intensity | strength and fire resistance by filling the concrete 13 in it. At that time, in the beam member connecting portion, the concrete 13 can be sufficiently filled up to the inner surface 2b through the interval (gap) S between the protrusions 3 and the interval S between the inner surface 2b and the protrusion opposing surface. In addition, the filled concrete 13 is difficult to peel off from the inner surface 2b by the projections 3 group even when the square steel pipe column 10 is swayed and deformed by wind or the like, so that sufficient strength and fire resistance can be obtained. Can demonstrate.
[0033]
In the first embodiment described above, the semi-formed long rectangular steel pipe 1 and the semi-formed short square steel pipe 2 are obtained by press-forming the steel plate and then butt welding, or after bending the steel plate. It is obtained by forming a round steel pipe by butt welding and then forming the round steel pipe by a press method or a roll method.
[0034]
Next, a second embodiment of the present invention will be described with reference to FIG.
That is, as shown in FIG. 8 (a), a semi-formed long round steel pipe (semi-formed long steel pipe) 21 having a predetermined thickness t is thicker than the plate thickness t of the semi-formed long round steel pipe 21. It consists of a semi-formed short round steel pipe (semi-formed short steel pipe) 22 having a plate thickness T and a length (height) L that forms a beam connecting part. The semi-formed long round steel pipe 21 and the semi-formed short round steel pipe 22 have butt welds 21a and 22a formed by butt welding at one place in the circumferential direction, and have a slightly larger diameter D + α. Molded. A projection 23 group is welded 24 to the inner surface 22 b of the semi-formed short round steel pipe 22.
[0035]
Next, the butt welds 20b and 21b are made to be the same straight line, and the semi-formed short round steel pipe 22 is welded and joined between the corresponding contacts of the semi-formed long round steel pipe 21 and the semi-formed short round steel pipe 22. A semi-formed round steel pipe column (semi-formed steel pipe column) 25 is configured as a beam connecting position.
[0036]
Next, by hot forming (shaping) the semi-formed round steel pipe column 25, as shown in FIG. 8B, the desired diameter D is achieved over the entire length, and the beam connecting position is thick. A round steel pipe column (steel pipe column) 26 having a plate thickness T, that is, a round steel pipe column 26 having an outer peripheral shape as a final product shape is obtained.
[0037]
Such a round steel pipe column 26 is transported to a construction site or the like and arranged in a stacked shape, and then is welded between the upper and lower sides thereof to be configured to have a predetermined length (height). The And before and after stacking welding, the concrete 27 is filled in the square steel pipe column 10.
[0038]
Therefore, the round steel pipe column 26 can cope with strength and fire resistance by filling the concrete 27 therein. At that time, in the beam member connecting portion, the concrete 27 is sufficiently filled up to the inner surface 22b through the interval (gap) S between the protrusions 23 and the interval S between the inner surface 22b and the protrusion-facing surface.
[0039]
In each of the above-described embodiments, a T-bolt shape is used as the protrusions 3 and 23, but this may be various, such as an I-bolt shape having a disc-shaped head or an L-shaped bracket shape. A projection having a different shape is used. Further, for example, as shown by the phantom line in FIG. 7, the projection 3a group may be additionally provided in a portion having a thin plate thickness at both ends outside the step portion 2c in the short rectangular steel pipe 2A. Good.
[0040]
In each of the above-described embodiments, as the steel pipe, for example, a one-seam square steel pipe by roll forming, a two-seam square steel pipe formed by facing and welding a pair of groove-shaped members by press forming, and a pair of rolled grooves are welded. Tsushimu RHS made, Tsushimu RHS with a welded rolled angle bar pair and opposed, etc. tetrahedral box, either ready-made steel pipes are used appropriately.
[0041]
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.
[0042]
In each of the above-described embodiments, welding is performed by an electroslag welder or an electrogas arc welder, and according to this, high-quality welding can be performed in a short time. Other welding methods such as laser may be used.
[0043]
【The invention's effect】
According to the first aspect of the present invention described above, by performing hot forming in the forming means on the semi-formed steel tube column heated in the heating means , the outer peripheral shape can be shaped over its entire length, and the homogenized steel tube pillar is Can be manufactured. Also, by hot forming, each weld can be integrated with the base material, the projections can be firmly bonded, and the plastic deformation performance is excellent, and brittle fracture can be prevented in advance.
[0044]
According to the second aspect of the present invention described above, by performing hot forming on the semi-formed square steel pipe column which has been welded, the curvature radii of the respective corner portions are made uniform over the entire length, and the flat plate portion and the corner are provided. A square steel pipe column with a uniform part can be manufactured. Furthermore, it is possible to manufacture a rectangular steel pipe column in which deformation such as a butt weld is not inclined and remains linear.
[Brief description of the drawings]
FIG. 1 shows a first embodiment of the present invention and is a partially cutaway perspective view of a half-formed square steel pipe column before welding joining in a method for manufacturing a steel pipe column.
FIG. 2 shows a semi-formed short square steel pipe in the method for producing the same steel pipe column, wherein (a) is a longitudinal front view and (b) is a plan view.
FIG. 3 is a process explanatory diagram of hot forming in the method for manufacturing the steel pipe column.
4A and 4B are explanatory views in the method of manufacturing the steel pipe column, wherein FIG. 4A is a cross-sectional plan view of a semi-formed square steel tube column, and FIG. 4B is a cross-sectional plan view of the square steel tube column.
FIG. 5 is a longitudinal front view of the steel pipe column.
FIG. 6 is a partially cutaway perspective view of the steel pipe column.
FIG. 7 is a longitudinal sectional front view of a main part of the steel pipe column.
FIG. 8 shows a second embodiment of the present invention, and is an explanatory view of a method for manufacturing a steel pipe column, wherein (a) is a cross-sectional plan view of a semi-formed round steel pipe column, and (b) is a round steel pipe column. FIG.
FIG. 9 is a partially cutaway perspective view of a steel pipe column showing a conventional example.
FIG. 10 is a partially cutaway perspective view of a steel pipe column, showing another conventional example.
[Explanation of symbols]
1 Semi-formed long square steel pipe (Semi-formed long steel pipe)
1a Butt weld 1A Long square steel pipe (long steel pipe)
2 Semi-formed short square steel pipe (Semi-formed short steel pipe)
2a Butt weld 2b Inner surface 2A Short square steel pipe (short steel pipe)
3 Protrusions 4 Welded joint 5 Welded joint 7 Semi-formed square steel pipe column (Semi-formed steel pipe column)
10 Square steel pipe column (steel pipe column)
11 Beam material 13 Concrete 15 Heating means 16 Forming means 21 Semi-formed long round steel pipe (Semi-formed short steel pipe)
21a Butt weld 22 Semi-formed short round steel pipe (Semi-formed short steel pipe)
22a Butt weld 22b Inner surface 23 Projection body 24 Welded joint 25 Semi-formed round steel pipe column (Semi-formed steel tube column)
26 Round steel pipe columns (steel pipe columns)
27 Concrete t Thickness of semi-formed long square steel pipe T Thickness of semi-formed short square steel pipe L Thickness to form beam connecting part W External dimension of steel pipe column W + α External dimension of semi-formed square steel pipe column R Semi-formed square Curvature radius of steel pipe r Curvature radius of steel pipe column D + α Diameter D of semi-formed round steel pipe Diameter D of round steel pipe column S Interval

Claims (2)

A semi-formed long steel pipe having a predetermined plate thickness, and a semi-formed short steel pipe having a thickness greater than that of the semi-formed long steel pipe and a length that forms a beam connecting portion. A protrusion group is welded and joined to the inner surface, and the semi-formed long steel pipe and the semi-formed short steel pipe have a butt weld portion formed by butt welding in at least one place in the circumferential direction, and the outer peripheral shape is final. The semi-formed long steel pipe and the semi-formed short steel pipe are welded and joined in the length direction with the semi-formed short steel pipe as a beam connecting position. A method of manufacturing a steel pipe column, comprising: forming a column, heating the semi-formed steel tube column with a heating unit, and then hot forming with a molding unit so that an outer peripheral shape thereof becomes a final product shape. Semi-formed long square steel pipes and semi-formed short square steel pipes are used, and the corners of these semi-formed long square steel pipes and semi-formed short square steel pipes are formed with a radius of curvature larger than the radius of curvature of the final product. 2. The semi-formed square steel pipe column formed by welding and joining is heated in the heating means, and then hot- formed in the forming means so that the corner portion has a curvature radius of the final product. Manufacturing method for steel pipe columns.

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