JP3095843B2 - Manufacturing method of circular steel pipe column - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a circular steel pipe column used as a column material for a large-scale multi-story steel structure (hereinafter, simply referred to as a work).

[0002]

2. Description of the Related Art With the increase in the height of buildings and the scale of underground works, the production of such circular steel tubular columns has been increasing year by year,
Various structures have been developed and put to practical use.

[0003] Fig. 5 shows a structure which has been adopted from a relatively early stage, and shows a connection portion of a steel pipe from the axial direction. In the figure, 1 is a circular steel pipe column, 2 is a flange for joining to a beam 3, and four flange pieces 2a, 2b, 2c, 2
d. Then, these four flange pieces 2a to 2d are arranged so as to cover the outer periphery of the circular steel pipe column 1, and the joint between the steel pipe column 1 and the flange pieces is welded to form an integral joint. Form.

[0004] That is, due to the design of the rigid frame structure, the rigidity of the connection between the steel pipe column applied to these workpieces and the mechanical rigidity for ensuring the continuity between the column and the beam and the full strength transmission of the column or the beam. Mechanical strength is required to ensure this. For this reason, in the structure shown in FIG. 5, each part is formed as a continuous and integral structure by welding, so that the out-of-plane deformation of the steel pipe column 1 generated by the force intensively applied via the flange 2 is suppressed and the excessive stress concentration part is formed. The structure is not made. However, this type requires a very high degree of processing accuracy because the number of components to be integrated by welding is large and the shape is complicated, and beam attachment is not always easy, and joining is possible. There are many restrictions on the shape of the beam. Furthermore, there is a disadvantage that a certain amount of stress concentration cannot be avoided around the welded portion W (FIG. 5) between the flange pieces.

[0005] Fig. 6 is a view opposite to that of Fig. 5 in order to simplify the structure of the flange portion, in particular, the steel pipe column 1 side is denoted by 1a, 1a.
b and 1c are shown. In this case, the performance requirements described above can be satisfied relatively easily, but the amount of welding is excessive due to the separation of the columns, and detailed management is necessary to ensure the quality of the weld seam and the linearity of the upper and lower columns. Disadvantage.

In contrast to the above, FIGS. 7 and 8 show a structure in which the column and the flange are integrally formed from the beginning. First, as shown in FIG. 7, the flanged pipe 4 and the straight pipe 5 which are manufactured by a casting method are joined at their respective ends by welding to finish the long circular steel pipe column 1. It is. In the drawing, W indicates this welded portion. The flange tube 4 is formed with a flange portion 4a, and the connection with the beam 3 is performed by welding with the flange portion 4a. In the drawing, H1 is the distance between the center positions of the beams 3 in the height direction, and corresponds to the height (floor height) of one layer of the workpiece.
Reference numeral 2 denotes a distance between a flange portion 4a joined to the upper flange of the beam 3 and a flange portion 4a joined to the lower flange.
(The height of the joint panel).

FIG. 8 is a structural view partially showing a conventional circular steel pipe column 1 of a still different type. In this case, a ring 6 made of a forged product is employed for a flange portion for joining with a beam 3. . The ring 6 is sequentially joined by welding in such a manner that the ring 6 is inserted between the long straight pipe 7 and the short straight pipe 8 having a length obtained by subtracting the height of the ring 6 from the height of the joint panel. It is to be finished into a circular steel pipe column 1. W indicates a welded portion as in FIG.

FIGS. 7 and 8 use a cast or forged product having a special shape in order to secure the rigidity required for the column / beam joint of the rigid frame.
By welding and assembling, the connection part has a continuous and integral structure. As a result, the manufacturing cost of the flange tube 4 and the ring 6 which are members constituting these connection portions becomes extremely high, and the welding portion needs to be completely penetration-welded, so that the overall cost becomes high. was there.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and has a simple structure in which a steel pipe and a ring-shaped flange, that is, a ring-shaped flange, are integrated by welding. Moreover, it is an object of the present invention to realize a method for manufacturing a circular steel pipe column whose processing contents are extremely simple.

[0010]

According to the method of manufacturing a circular steel pipe column according to the present invention, a steel pipe having an outer diameter including a finishing margin for finishing to a predetermined dimensional accuracy required for welding to a flange. The material is prepared as a material, and as the flange, a material whose inner diameter is finished to a predetermined dimensional accuracy necessary for welding with the steel pipe is prepared, and one of the flanges from both ends to the mounting position of the flange is prepared. After finishing only the outer peripheral portion to the predetermined dimensional accuracy, the flange is fitted from the end of the steel pipe subjected to the finishing processing to a mounting position, and the steel pipe and the flange are welded. In this case, when the ring-shaped flange is fitted into the steel pipe and welded, the required machining range of the outer periphery of the steel pipe is small.

Further, if a plurality of flanged steel pipes manufactured by the above-described method are arranged coaxially and each end is welded to finish a long steel pipe column, the machining range is small, and moreover, A long circular steel pipe column can be obtained without increasing the number of welds.

Further, a pair of flanges are provided on a unit steel pipe having a length corresponding to the height of one layer of a multi-layered workpiece, at a position approximately one half of a dimension corresponding to a beam height from both ends thereof. It is necessary if the unit steel pipe columns are manufactured by attaching them together in a unit, and then the required number of the above-mentioned unit steel pipe columns are arranged coaxially, and each end is welded to finish it into a steel pipe column of a predetermined length. Machining range is further reduced.

Further, a unit steel pipe having a length required for mounting a set of flanges is prepared, and the outer diameter of the unit steel pipe is finished to a predetermined dimensional accuracy required for welding with the flange, and then the inner diameter is formed. Inserts a set of flanges finished to a predetermined dimensional accuracy necessary for welding with the unit steel pipe to a predetermined mounting position of the unit steel pipe, and welds the unit steel pipe to the set of flanges to form a first unit. A second unit for manufacturing a steel pipe column, wherein the sum of the length of the first unit and the length of the steel column is equal to the height of one layer of the multi-layered workpiece, and the second unit not having the flange attached thereto. A steel pipe column is prepared, and thereafter, a required number of the first and second unit steel pipe columns are alternately and coaxially arranged, and each end is welded to finish a steel pipe column of a predetermined length. Good. In this case, the first machining of the outer periphery is performed.
Since the length of the unit steel pipe column itself is short, the machining range is reduced, and the processing and welding work with the flange are simplified.

Further, as described above, the machining range in the case of manufacturing the first unit steel pipe column is limited to only one of from both ends of the steel pipe to the mounting position of each flange. The required machining area is further reduced.

[0015]

FIG. 1 is a block diagram for explaining a method of manufacturing a circular steel pipe column according to an embodiment of the present invention. Here, a case of manufacturing a circular steel pipe column which bears a required number of layers of a workpiece is shown.
First, a unit steel pipe 10a having a length H1 corresponding to the height (floor height) of one layer of a workpiece is prepared as a material (FIG. 1).
(1)). Here, the outer diameter of the unit steel pipe 10a is
The dimensions include a finishing margin for finishing to a predetermined dimensional accuracy required for welding to a flange 11 described later. That is,
Assuming that the outer diameter of the unit steel pipe 10a as a material is D ₀ , the outer diameter after finishing is D ₁ , and the finishing margin is S, D ₀ = D ₁ + 2S
Is established.

Next, the outer periphery of the unit steel pipe 10a is machined. As shown in FIG. 1A, the working range is a size corresponding to the height of the joint panel from both ends of the unit steel pipe 10a. Only half of H2. Of course,
Strictly, this dimension includes the thickness of the flange 11. As described above, the outer diameter of the unprocessed portion of the unit steel pipe 10a is D ₀ ,
The outer diameter of the processed content becomes D _1. Next, a pair of completely integrated annular, ie, ring-shaped flanges 11A and 11B (FIG. 1 (4)) whose inner diameter is finished to a predetermined dimensional accuracy necessary for welding to the unit steel pipe 10a is prepared, and FIG. As shown in 2), one flange 11A extends from the left end of the unit steel pipe 10a to a predetermined mounting position, and the other flange 11A extends.
1B is fitted from the right end of the unit steel pipe 10a to a predetermined mounting position. In this fitting range, the outer circumference of the unit steel pipe 10a is finished to the required dimensional accuracy by machining, so that a smooth fitting is possible, and the distance for moving the flange 11 for fitting is small, so that
Work contents are simple and completed in a short time.

Next, using a suitable jig, the flange 11
Is held from above the unit steel pipe 10a, welding of the flange 11 and the unit steel pipe 10a is performed from both sides of the flange 11 over the entire circumference by an automatic welding machine. The end surface to be welded between the flange and the steel pipe forms a complete circumferential surface, and both surfaces are finished to the required dimensional accuracy, so that an automatic welding machine can be applied and high efficiency and high quality Welding is obtained. In this case, if the flanges 11A and 11B are simultaneously welded, the automatic welding machine becomes large-scale,
Work efficiency is further increased. Of course, the flanges 11A and 11A
B may be sequentially welded. Thus, the unit steel pipe column 10 is completed (FIG. 1 (2)).

Finally, as shown in FIG. 1 (3), a required number of unit steel pipe columns 10 are arranged coaxially, and the respective ends are welded to finish a circular steel pipe column 12 of a predetermined length. In the figure, W indicates a welded portion. Usually, the steel pipe columns 10 are transported from a steel pipe maker to a construction site in the form of unit steel pipe columns 10, and the unit steel pipe columns 10 are welded at the construction site.

Although the unit steel tube 10a itself is a considerably long object, according to the above-mentioned method, it is sufficient to perform the machining of the outer periphery in an extremely small range, and the machining cost and the machining time can be greatly reduced. . Further, since the processing range is small, even if the margin S is slightly increased, the influence on the product cost is relatively small. Therefore, the unit steel pipe 10a as a material
It is also possible to reduce the cost of the unit steel pipe 10a by relaxing the outer diameter dimensional accuracy, particularly in the stage of manufacturing itself, that is, at the stage of processing from a flat material to a steel pipe.

Further, by welding the unit steel pipe columns 10 shown in FIG. 1 (2), the flanges 11 are integrally mounted at predetermined intervals as shown in FIG. Can be manufactured at extremely low cost. Further, a completely ring-shaped material is used for the flange 11, and the inner diameter of the
Since the outer diameter of 0a is processed to a sufficient dimensional accuracy as required, and the two are integrated into a single structure by welding, the mechanical strength required for the connection part of this kind of circular steel pipe column has sufficient reliability. And can be secured.

In the above embodiment, the flange 11 is mounted at a position which is 1/2 of the dimension corresponding to the height of the beam from the end of the unit steel pipe 10a.
It is not necessary to set the distance between the pair of flanges 11 adjacent to the welded portion W when the unit steel pipes 10 are welded to each other to be a dimension corresponding to a predetermined beam height.

FIG. 2 is a structural view for explaining a method of manufacturing a circular steel pipe column showing another embodiment of the present invention. Here, first, the length H required to weld the pair of flanges 11A and 11B at an interval H2 corresponding to the height of the joint panel.
a (accordingly, Ha> H2) is prepared, machined by the method described in the embodiment of FIG. 1 and welded to both flanges 11A and 11B to form the first unit steel pipe column 13. Finish (Fig. 2 (1)).

FIG. 2B shows a second unit steel pipe column 14 having a length Hb such that Ha + Hb is equal to a length H1 corresponding to the height (floor height) of one layer of the workpiece. And therefore H
b = H1−Ha is set. Since the flange 11 is not welded to the second unit steel pipe column 14, it is not necessary to machine the outer periphery of the second unit steel column 13, as long as the welding between the unit steel columns 13 and 14 described later is not hindered. The obtained steel pipe material can be used as it is only by machining only the end face thereof.

Finally, as shown in FIG. 2 (3), the required number of unit steel pipe columns 13 and 14 are alternately and coaxially arranged, and their ends are welded to each other to form a circular steel pipe column of a predetermined length. 1
Finish to 5. In the drawing, W indicates a welded portion.

In this case, it is a matter of course that the machining range of the outer periphery of the steel pipe is small, but the length of the steel pipe itself to be processed is shorter than that of the method shown in FIG. Work such as attaching and detaching a work (steel pipe) to and from these welding machines is simplified. In the above description, the machining range applied to the unit steel pipe 13a is the flange 11
From the mounting position to the end of the steel pipe 13a.
You may make it process over the full length of 3a. In this case, although the machining range slightly increases, for example, it is possible to simplify the work procedure by reducing the machining procedure of the lathe, and it may be possible to shorten the work time as a whole.

FIG. 3 shows still another embodiment, in which a tapered portion 10b is formed at an end of a unit steel pipe 10a.
The embodiment differs from the embodiment shown in FIG. 1 in that the outer diameter decreases toward the end of the steel pipe and is joined to and integrated with the adjacent small diameter unit steel pipe 10c. In this case, the method described with reference to FIG. 1 can be applied as it is because the machining of the tapered portion 10b between the flange 11A and the right end of the unit steel pipe 10a is not necessary, and the same effect can be obtained. Play.

In each of the above embodiments, the floor height of the workpiece,
That is, the height of one layer (H1 is equivalent in each drawing) is described as being equal in each layer, but the present invention is not limited to such conditions at all, and the height of each layer is not limited. The present invention can be applied to a case different from each other and has the same effect. In addition, the present invention can be similarly applied to the case where the height of the joint panel, that is, the height of the beam (H2 is equivalent in each drawing) differs depending on the layer, and the same effect can be obtained.

In the above embodiment, two beams are used for one layer.
Although a pair of flanges are provided, the present invention is applied to a single-layer beam when the floor height or the height of the beam changes, or when the floor level partially changes on the same floor. The present invention is also applicable to a case in which three or more flanges are required. Further, the flange may be of any shape as long as it is completely integrally annular, that is, a ring shape. That is, for example, as shown in FIG. 4, various shapes of flanges 11C and 11D can be applied according to the form of the beam to be joined and integrated.

The present invention is not limited to a multi-layer steel structure, and can be widely applied to the manufacture of a circular steel pipe column having a structure in which a circular steel pipe is used as a column material and a flange for beam connection is integrally attached to the column by welding. Things.

[0030]

Since the present invention is constructed as described above, it has a simple structure in which the flange is integrally attached to the outer periphery of the steel pipe by welding, and the range in which the outer circumference of the steel pipe is machined to the required dimensional accuracy. However, a low cost and highly reliable circular steel pipe column can be obtained.

Further, since a plurality of flanged steel pipes manufactured by the above method are arranged coaxially and the respective ends are welded to each other, a long circular steel pipe column can be formed at a small number of welding points by taking advantage of the above advantages. Obtainable.

Further, a pair of flanges is attached to a unit steel pipe having a length corresponding to the height of one layer by the above-described method to form a unit steel pipe column, and a required number of these are welded to be integrated. In addition, a circular steel pipe column that can be applied to a multi-layered workpiece as it is can be finished with extremely simple processing.

In addition, the first unit steel column, which requires machining for welding the flange, but is short, and the second unit steel column, which is long, which does not require machining, are alternately joined and integrated. As a result, the working range of the machining is simplified as well as the range of machining is reduced.

[Brief description of the drawings]

FIG. 1 is a series of structural diagrams for explaining a method of manufacturing a circular steel pipe column according to one embodiment of the present invention.

FIG. 2 is a series of structural views for explaining a method of manufacturing a circular steel pipe column according to another embodiment of the present invention.

FIG. 3 is a configuration diagram for explaining a main part in still another embodiment of the present invention.

FIG. 4 is a configuration diagram for explaining a shape of a flange in still another embodiment of the present invention.

FIG. 5 is a configuration diagram showing an example of a conventional circular steel pipe column in a partial cross section.

FIG. 6 is a configuration diagram partially showing a cross section of an example of a conventional circular steel pipe column different from FIG. 5;

FIG. 7 is a configuration diagram showing a partial cross section of an example of another conventional circular steel pipe column.

FIG. 8 is a configuration diagram showing, in a partial cross section, still another example of a conventional circular steel pipe column.

[Explanation of symbols]

10 is a unit steel pipe column, 10a is a unit steel pipe, 11 is a flange, 12 is a circular steel pipe column, 13 is a first unit steel pipe column, 13
a is a unit steel pipe, 14 is a second unit steel pipe column, 15 is a circular steel pipe column, H1 is a length corresponding to the height (floor height) of one layer, H
2 is the dimension corresponding to the beam height (the height of the joint panel), W
Is the weld

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) E04B 1/24 E04B 1/58 508 E04C 3/32 B23K 9/00 501

Claims (5)

(57) [Claims] 1. A method of manufacturing a circular steel pipe column comprising a cylindrical steel pipe and a ring-shaped flange for joining to a beam integrally attached to an outer periphery of the cylindrical steel pipe by welding, wherein the steel pipe has an outer diameter corresponding to that of the flange. Prepare a material with dimensions including finishing margin for finishing to the required dimensional accuracy required for welding, as the above flange,
The inner diameter was prepared to have a predetermined dimensional accuracy necessary for welding with the steel pipe, and only one of the outer peripheral portions from both ends of the steel pipe to the mounting position of the flange was finished to the predetermined dimensional accuracy. A method of manufacturing a circular steel pipe column, wherein the flange is fitted from the end of the steel pipe subjected to the finish processing to the mounting position, and the steel pipe and the flange are welded. 2. A circular steel pipe column comprising a plurality of flanged steel pipes manufactured by the method according to claim 1 arranged coaxially, and each end welded to a long steel pipe column. Manufacturing method. 3. A ring shape for joining a pair of beams, which is arranged on an outer periphery of a cylindrical steel pipe having a length corresponding to a required number of layers of a multi-layered workpiece at an interval corresponding to a height of a beam. A plurality of pairs of flanges are integrally attached by welding sequentially at intervals corresponding to the height of one layer of a multi-layered workpiece, the flanges corresponding to the height of one layer of the multi-layered workpiece. Has a length ,
The outer diameter is the required dimensional accuracy required for welding to the above flange
Unit steel pipe with dimensions including finishing margin for finishing
Prepare the above flange, the inner diameter of which is
Prepare a product finished to the specified dimensional accuracy required for welding, and
The predetermined dimensional accuracy of only the outer peripheral portion to approximately 1/2 of the position of the dimension corresponding from both ends of the serial unit steel each beam height
After finishing each time, each of the above pair of flanges
From the both ends of the unit steel pipe to the above position,
The unit steel pipe is welded by welding the steel pipe and the flange.
Attach the pair of flanges integrally to manufacture a unit steel pipe column, then arrange the required number of the unit steel column coaxially, weld each end and finish it to a steel pipe column of a predetermined length A method for producing a circular steel pipe column, characterized by the following. 4. A set of beam joining rings arranged on the outer circumference of a cylindrical steel pipe having a length corresponding to the required number of layers of a multi-layered workpiece at an interval corresponding to the height of a beam. In a method for manufacturing a circular steel pipe column in which a plurality of sets of flanges are integrally attached by welding sequentially at intervals corresponding to the height of one layer of a multi-layered workpiece, the length required for attaching the one set of flanges is determined. After preparing a unit steel pipe having an outer diameter of the unit steel pipe and finishing the outer diameter of the unit steel pipe to a predetermined dimensional accuracy required for welding with the flange, the inner diameter thereof is finished to a predetermined dimensional accuracy required for welding with the unit steel pipe. A set of flanges is fitted to a predetermined mounting position of the unit steel pipe, and the unit steel pipe and one set of flanges are welded to produce a first unit steel pipe column. The length whose sum is the length corresponding to the height of one layer of the above multi-layer work A second unit steel pipe column not having the flange is prepared, and then a required number of the first and second unit steel pipe columns are alternately arranged coaxially, and each end is welded to each other. And producing a steel pipe column having a predetermined length. 5. A set of beam-joining rings arranged on the outer periphery of a cylindrical steel pipe having a length corresponding to the required number of layers of a multi-layered workpiece at an interval corresponding to the height of a beam. In a method for manufacturing a circular steel pipe column in which a plurality of sets of flanges are integrally attached by welding sequentially at intervals corresponding to the height of one layer of a multi-layered workpiece, the length required for attaching the one set of flanges is determined. Yes, and the
The outer diameter is adjusted to the specified dimensional accuracy required for welding with the flange.
Prepare a unit steel pipe with dimensions including the finishing margin to raise, and as the above flange, the inner diameter is welded to the above steel pipe.
Prepare a product finished to the specified dimensional accuracy required for
Attach the above set of flanges from both ends of the steel pipe
Only the outer peripheral part up to the position required for
After finishing, a part of the above set of flanges
And the rest of them from each end of the unit steel pipe
Insert the unit steel pipe to the required position for
The above-mentioned one set is attached to the above unit steel pipe by welding
The first unit steel pipe column is manufactured by integrally attaching the flanges of the above, and the length of the first unit steel tube column is determined to be a length corresponding to the height of one layer of the multi-layered workpiece. A second unit steel pipe column having the above flange and not having the flange is prepared. Thereafter, a required number of the first and second unit steel pipe columns are alternately arranged coaxially, and each end is welded to each other. A method for manufacturing a circular steel pipe column, which is finished to a steel pipe column of a predetermined length.