JPH11731A - Manufacture of steel tube with internal reinforcement - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method of a steel tube with an internal reinforcement in which insertion of the internal reinforcement into the steel tube is executed easily, smoothly by taking sufficient clearnce and the connection of the steel tube with the internal reinforcement is easily executed in a state the clearance is hardly existent. SOLUTION: The internal reinforcement 10 is inserted easily, smoothly without generating hooking, clogging or the like in the prescribed position inside an original tube 2 having slightly larger dimension than that of a product steel tube 3 by utilizing sufficient clearance S which is generated between the outside surface 12a of the internal reinforcement and the inside surface 2a of the original tube. After heating the original tube 2 together with the internal reinforcement 10, by executing hot drawing, it is formed into the product steel tube 3 and also, by abutting the inside surface 3a of the product steel tube 3 on the outside surface 12a of the internal reinforcement 10, the internal reinforcement 10 is fixed to the product steel tube 3. The product steel tube 3 is cooled together with the internal reinforcement 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, an internal reinforcement in which, when connecting columns of a steel structure with beams, an internal reinforcing material for securing a plate thickness or the like is attached to a connection portion on the column side. The present invention relates to a method for manufacturing a steel pipe with a material.

[0002]

2. Description of the Related Art Conventionally, a diaphragm (an example of an internal reinforcing material) has been attached to a column side by, for example, a beam penetrating method. According to this beam penetration method, a pillar, that is, a square steel pipe is cut into a plurality of pieces in the length direction, and a groove is formed on each cut surface, and then a diaphragm is attached. It requires a lot of time and money, and has many problems such as many welding points.

Therefore, as a method of not cutting a rectangular steel pipe, there has been provided a method of positioning and welding a diaphragm in a large-diameter rectangular steel pipe as disclosed in Japanese Patent Application Laid-Open No. 7-238636, for example. In this conventional method, an inner diaphragm having a backing metal temporarily attached and welded to both sides thereof is inserted into a square steel pipe, engaged with a knock pin fitted in a through-hole, positioned at a predetermined position, and then placed at the insertion port side. After tack-welding the backing metal to the inner wall of the square steel pipe,
Erect slag welding is performed between the inner wall of the rectangular steel pipe and the outer periphery of the inner diaphragm.

[0004]

In the above-mentioned construction method in which the rectangular steel pipe is not divided, the outer diameter of the backing metal is allowed to contact the inner wall of the rectangular steel pipe without any gap, for example, by allowing a gap of about 0.5 mm. Therefore, when the inner diaphragm is inserted into the rectangular steel pipe, the inner diaphragm is caught or jammed, so that the inner diaphragm cannot be easily inserted. Further, when the inner surface of the rectangular steel pipe has changed in irregularities, the insertion itself cannot be performed.

[0005] To cope with this, it is sufficient to make a sufficient gap. However, if this gap is large, the electroslag welding in the welding space surrounded by the square steel pipe, the inner diaphragm and the two backing plates is performed. When the molten metal stays, the molten metal may leak to the outside from the gap, and there is a possibility that good welding cannot be performed.

Therefore, according to the first aspect of the present invention, the internal reinforcing member can be easily and smoothly inserted into the steel pipe by leaving a sufficient gap, and the connection between the steel pipe and the internal reinforcing member can be easily achieved. It is an object of the present invention to provide a method for manufacturing a steel pipe with an internal reinforcing material that can be easily performed with almost no gap.

[0007]

In order to achieve the above-mentioned object, a method of manufacturing a steel pipe with an internal reinforcing material according to the first aspect of the present invention is a method of manufacturing a steel pipe having a size slightly larger than a product steel pipe. After inserting the internal reinforcing material at the position, the raw tube is heated together with the internal reinforcing material, the raw tube is hot drawn and formed into a product steel pipe, and the inner surface of the product steel pipe is used as the internal reinforcing material. It is characterized in that it is brought into contact with the outer surface and the product steel pipe is cooled together with the internal reinforcing material.

Therefore, according to the first aspect of the present invention, the internal reinforcing member is prevented from being caught or clogged in the raw tube by utilizing a sufficient gap generated between the outer surface of the internal reinforcing member and the inner surface of the raw tube. It can be easily and smoothly inserted. Then, by hot drawing of the original pipe, the product steel pipe can be made to have good properties, and the gap can be automatically filled to bring the inner surface of the product steel pipe into contact with the outer surface of the internal reinforcing material (pressure contact). The internal reinforcement can be fixed to the product steel pipe.

According to a second aspect of the present invention, there is provided a method of manufacturing a steel pipe with an internal reinforcing material, wherein the internal reinforcing material is an inner diaphragm integrated with a backing material. After cooling and shrinking the product steel pipe, the backing material and the inner diaphragm are welded to the inner surface of the product steel pipe.

Therefore, according to the second aspect of the present invention, the inner diaphragm integrated with the backing material can be easily and smoothly inserted into the original pipe by using a sufficient gap, and the inner diaphragm can be easily and smoothly inserted into the original pipe. Can be performed without the molten metal leaking to the outside.

According to a third aspect of the present invention, there is provided a method of manufacturing a steel pipe with an internal reinforcing material, wherein the unevenness is formed on the outer surface of the internal reinforcing material in the structure of the first or second aspect. It is what it was.

Therefore, according to the third aspect of the present invention, the inner surface of the product steel pipe is brought into contact with the outer surface of the inner reinforcing material by hot drawing of the original pipe, thereby fixing the inner reinforcing material to the product steel pipe. In this case, the concave and convex portions are recessed into the inner surface of the product steel pipe, and the internal reinforcing material and the product steel pipe can be firmly integrated.

According to a fourth aspect of the present invention, there is provided a method of manufacturing a steel pipe with an internal reinforcing material according to any one of the first to third aspects, wherein the internal reinforcing material comprises: And an integrated inner diaphragm positioned at a plurality of locations.

Therefore, according to the fourth aspect of the present invention, it is possible to obtain a product steel pipe in which internal reinforcing members having inner diaphragms at a plurality of positions are inserted at predetermined positions.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. 1 to 12 in a state adopted when a square rectangular steel pipe is hot formed.

In FIGS. 1 and 2, for example, in manufacturing a large-diameter rectangular steel pipe, a square-shaped polygonal hollow steel pipe having seam welds 1 at most two places (an example of a raw pipe)
2 are used. At this time, the polygonal hollow steel pipe 2 is formed so that the inner surface width dimension Wa of the opposed flat plate portion 2A is slightly larger than the inner surface width dimension of the flat plate portion of the product steel pipe (final product, which will be described later). And the radius of curvature R of the corner 2B
a is formed larger than the radius of curvature of the corner of the product steel pipe.

The polygonal hollow steel pipe 2 thus formed is
It is carried on the carry-in floor device 20. Here, the loading floor device 20
Is a conveyor type, supports a plurality of polygonal hollow steel pipes 2 in parallel, and conveys them in a horizontal direction perpendicular to the length direction. The portion of the loading floor device 20 includes a polygonal hollow steel pipe 2 supported laterally by the loading floor device 20.
An internal reinforcing material supply device 40 for inserting an internal diaphragm (an example of an internal reinforcing material) 10 into a predetermined position in the inside is provided.

The inner diaphragm 10 has a rectangular plate shape as shown in FIGS. 4 and 7, and its outer dimension is sufficient between the inner surface of the flat portion of the polygonal hollow steel pipe 2 (the inner surface of the original tube) 2a. The gap (about 5 to 6 mm) S is set to be generated. At the center of the inner diaphragm 10, a through portion 11 having a predetermined inner diameter (described later) is formed. A backing material 12 is integrated by welding on both sides of the inner diaphragm 10 and the outer periphery thereof. Here backing material 1
2 is formed by integrating flat steel or square steel having a rectangular cross section in a frame shape, and is integrated with the side surface of the inner diaphragm 10 by welding through the inner surface.

The inner diaphragms 10 are connected to each other at a predetermined interval via a rod body 13 to form one set, and a backing material 12 is integrated with each inner diaphragm 10. . At that time, backing material 1
The outer dimension L (the outer dimension of the internal reinforcing material) L is the inner diaphragm 10
And the same as (slightly larger than) the inner surface width of the final product steel pipe.

As shown in FIGS. 2 to 7, the internal reinforcing material supply device 40 is provided on at least one side of the carry-in floor device 20, and an arm body 42 is slidably provided on the main body 41 side. Can be The arm 42 has a cylindrical shape, and slides through a guide device (not shown), so that the arm 42 can be inserted into and pulled out of the polygonal hollow steel pipe 2. At this time, the reciprocating sliding of the arm body 42 is performed by the operation of the cylinder device 43 provided between the arm body 42 and the main body 41 side.

The arm 42 is provided with an inner diaphragm supporting device 45 capable of supporting and releasing the inner diaphragm 10 by operation from the base end side of the arm 42. That is, the small-diameter cylindrical portion 46 is integrated with the distal end of the arm 42, so that a step 47 is formed between the arm 42 and the small-diameter cylindrical portion 46. Here, the outer diameter of the small-diameter cylindrical portion 46 is set smaller than the inner diameter of the through portion 11. Therefore, the inner diaphragm 10 is externally fitted to the small-diameter cylindrical portion 46 through the through portion 11, and the side surface of the inner diaphragm 10 abuts on the step portion 47.

An inner cylinder 48 is fitted into the arm 42,
A cam body 49 is fixed at a plurality of points (or the entire circumference) at the distal end of the inner cylindrical body 48 and in the circumferential direction. 49a. A plurality of holders 50 having a cam surface 50a to be brought into contact with the cam surface 49a are provided, and these holders 50 are fitted into guide holes 51 formed in the small-diameter cylindrical portion 46 so that the center of the arm body is formed. It is configured to move toward and away from.

A box-shaped case body 5 is provided at the base end of the arm body 42.
2 is fixed, and the base end of the inner cylindrical body 48 is
It has reached up to 2. An inner bracket 53 is fixed to the base end of the inner cylinder 48, and a cylinder device for pushing and pulling the inner cylinder 48 along the center of the arm between the inner bracket 53 and the case 52. 54 are provided at a plurality of locations around the center of the arm.

The inner cylinder 4 is moved by the cylinder device 54.
8 is pulled toward the base end, the group of holders 50 is moved away from the center of the arm by the cam surface 49a and the cam surface 50a, and is pressed against the inner surface of the through portion 11 of the inner diaphragm 10. Thus, the inner diaphragm 10 is held.
Further, when the inner cylinder 48 is pushed and moved to the tip side by the cylinder device 54, the group of holders 50 is moved closer to the center of the arm by the cam surface 49a and the cam surface 50a, and the inner diaphragm 10 penetrates. The inner diaphragm 10 is loosely fitted in the portion 11 to release the holding of the inner diaphragm 10. 46 to 5 above
4 and the like constitute an inner diaphragm support device 45.

The main body 41 of the internal reinforcing material supply device 40
Is supported on a floor-side pedestal 55 via a lift device 56, so that the internal reinforcing material supply device 40 is configured to be able to move up and down. As described above, on the loading floor device 20,
The polygonal hollow steel pipe 2 being intermittently conveyed in the transverse direction perpendicular to the length direction is stopped facing the internal reinforcing material supply device 40. At this time, in the internal reinforcing material supply device 40, as shown by a solid line in FIGS.
The inner diaphragm supporting device 45 at the set position supports the inner diaphragm 10 in which the backing material 12 is integrated and made into one set of two sheets.

That is, one inner diaphragm 10 is fitted to the small-diameter cylindrical portion 46 provided at the tip of the arm 42 through the penetrating portion 11, and the side surface of the inner diaphragm 10 is brought into contact with the step portion 47. Contact Then, the inner cylindrical body 48 is pulled toward the base end side by the cylinder device 54, so that the group of the holders 50 is moved away from the center of the arm body by the cam surface 49a and the cam surface 50a, and the inner diaphragm 10 is moved. The inner diaphragm 10 is supported by being pressed against the inner surface of the through portion 11. At this time, the phase of the inner diaphragm 10 in the circumferential direction with respect to the polygonal hollow steel pipe 2 is adjusted.

In this state, the cylinder device 43 is operated, and the arm body 42 is protruded and moved with respect to the main body 41. As shown in phantom lines in FIGS. 3 and 4, and in FIGS. Then, the pair of inner diaphragms 10 are inserted to a predetermined position. At this time, the outer size L of the backing material 12 integrated with the inner diaphragm 10 is smaller than the inner surface width dimension Wa of the polygonal hollow steel pipe 2, and a gap is provided between the backing material outer surface 12a and the flat plate portion inner surface 2a. Since S is generated, the inner diaphragm 10 can be inserted without being caught or clogged. The position of the insertion movement of the arm 42 is controlled by a control device (not shown) so that the inner diaphragm 10 is positioned at a predetermined position in the polygonal hollow steel pipe 2.

After the step of supplying (inserting) the inner diaphragm 10 is completed, the lowering of the polygonal hollow steel pipe 2 as shown in FIG. The lower outer surface 12a of the backing member 12 is brought into contact with (landed on) the inner surface 2a of the flat plate portion 2A. At this time, between the inner surface 2a of the upper flat plate portion 2A and the upper outer surface 12a, a gap 2S approximately twice as large is formed as shown in FIG.

In this state, the support of the inner diaphragm 10 by the inner diaphragm support device 45 is released, and the arm body 42 is pulled out. That is, in the inner diaphragm support device 45, the inner cylinder 4
8 is moved toward the distal end side, and the group of holders 50 is moved closer to the center of the arm body by the guide surface 51 by the cam surface 49a and the cam surface 50a, and the penetrating portion 11 of the inner diaphragm 10 is moved. The support for the inner diaphragm 10 is released. Next, as shown in FIG. 6, the arm body 42 is pulled out of the polygonal hollow steel pipe 2 by the cylinder device 43. At that time, the inner diaphragm supporting device 45 can be pulled out of the inner diaphragm 10 through the through portion 11 thereof.

As shown in FIGS. 1 and 2, the polygonal hollow steel pipe 2 having the inner diaphragm 10 inserted at a predetermined position is conveyed to the terminal end of the loading floor device 20 and then the roller conveyor 21. , And is conveyed in the heating furnace 22 in the longitudinal direction, and is heated at a high temperature A together with the inner diaphragm 10 during the conveyance.

Polygonal hollow steel pipe 2 heated to a predetermined temperature
Is carried out of the heating furnace 22 and then carried into the pre-stage square steel tube forming mill 23. This front-end square steel tube forming mill 23
Then, hot forming processing (forming temperature, A3 (The transformation point or more), and the former stage drawing is performed on the polygonal hollow steel pipe 2. Next, the polygonal hollow steel pipe 2 is carried into a post-stage square steel pipe forming mill 25. In the post-stage square steel tube forming mill 25, a hot forming process (forming temperature, A
Three (The transformation point or more), the latter (final stage) drawing is performed on the polygonal hollow steel pipe 2, and the square steel pipe (product steel pipe) 3 having a large diameter and a square shape having a predetermined dimension is hot-pressed. Molding process.

As described above, the polygonal hollow steel pipe 2 is subjected to multiple stages of drawing (or single-stage drawing) by the front-stage square steel tube forming mill 23 and the rear-stage square steel tube forming mill 25, thereby obtaining a final product. Can be manufactured.

At this time, by the above-mentioned drawing process,
The inner surface width dimension W of the opposed flat plate portion 3A in the rectangular steel pipe 3 is smaller than the inner surface width dimension Wa of the polygonal hollow steel pipe 2;
That is, it is formed so as to satisfy W <Wa, and as shown in FIGS. 1 and 8, the gap S is eliminated, and the inner surface (the inner surface of the product steel pipe) 3 a of the flat plate portion 3 </ b> A of the rectangular steel pipe 3 becomes the backing material. 12 is brought into contact with (pressed against) the outer surface 12a, and furthermore, it is slightly indented. As a result, the inner diaphragm 10 side is joined to the square steel pipe 3, and at this time, as shown in FIGS. 8 and 10, a closed welding is performed by the flat plate portion inner surface 3 a, the outer surface of the inner diaphragm 10, and both backing materials 12. A space X is formed.

The corner 3
The radius of curvature R of B is smaller than the radius of curvature Ra of the corner portion 2B of the hollow polygonal steel pipe 2, that is, it is formed so that R <Ra, and the corners R at the four corners are aligned.

Here, the inner surface width W of the rectangular steel pipe 3 is a dimension of a final product after being heat-formed and cooled. Immediately after the heat-forming, as shown in FIG. The inner surface width W is larger than the inner surface width W of the final product, that is, W <W + α <Wa. Also, the inner diaphragm 10 side is similarly heated and expanded,
Its outer dimension is L + α.

As described above, the corner 2 of the polygonal hollow steel pipe 2
B is the radius of curvature R of the corner 3B of the square steel pipe 3
Since it can be formed into a larger size, reasonable tube forming (tube press forming) can be easily performed. The polygonal hollow steel pipe 2 whose material (molecular arrangement) has returned to the original state by the high-temperature heating A is hot-drawn and formed so that the inner surface width dimension W is small and the radius of curvature R of the corner 3B is small. By doing so, the residual stress is also removed, and a final product having a high section modulus, that is, a square steel pipe 3 can be obtained without changing the material in all sections.

Further, by hot drawing forming, the rectangular steel pipe 3 can be completely or almost completely formed from the front end to the rear end, so that the cutting and removing of the front end and the rear end in the post-process become unnecessary. Alternatively, the cutting and removing are performed with a short dimension, so that the yield is improved.

In the rectangular steel pipe 3 immediately after hot forming, each flat plate portion 3A has a straight surface, and the radius of curvature R of the corner portion 3B is sharp, and the section modulus is high. Since the polygonal hollow steel pipe 2 has a regular square shape, the roller conveyor 2
1 can always be performed in a fixed direction by using one flat plate portion 3A. Therefore, the hot forming process in the rectangular steel tube forming mills 23 and 25 always moves the position of the seam welded portion 1 in a fixed direction. Can be aligned.

As shown in FIGS. 1 and 2, necessary parts (in front of the square steel tube forming mill 23, between the square steel tube forming mills 23 and 25, and in the rear stage) around the square steel tube forming mills 23 and 25. At one or more locations, such as after the square steel tube forming mill 25, the required number of descaler devices 2
7 are provided. The descaler device 27 injects water with water pressure applied to the square steel pipe 3 and the like, and can remove the mill scale and the like by this water injection to improve the surface skin.

As described above, the rectangular steel pipe 3 formed by hot working is received by the cooling floor device 30. This cooling floor device 30 is configured by, for example, arranging eight (multiple) chain conveyor devices 31 which can be intermittently driven in synchronization. A post-stage cooling floor device 32 is disposed continuously to the end of the cooling floor device 30. This subsequent cooling floor device 32
Has a configuration similar to that of the cooling floor device 30, and is configured by arranging a plurality of chain conveyor devices 33 side by side.
A take-out conveyor device 34 for receiving the rectangular steel pipe 3 from the latter cooling floor device 32 is provided outside the terminal end of the latter cooling floor device 32.

At the starting end of the chain conveyor device 31 in the cooling floor device 30, the square steel tubes 3 formed by hot working are supplied one after another. At this time, the cooling floor device 30 removes a plurality of the square steel tubes 3 from each other. It is supported in parallel and transported in a transverse direction perpendicular to its length. During the transportation in the cooling floor device 30, the rectangular steel pipe 3 is radiated B by air cooling.
That is, it is gradually cooled. The transfer of the group of square steel pipes 3 in such a cooling floor device 30 is performed in a state where the adjacent square steel pipes 3 are separated from each other, whereby the square steel pipes 3 are gradually cooled at the same ambient temperature. Become.

The pre-cooled square steel pipe 3
Is moved from the terminal end of the cooling floor device 30 to the start end of the subsequent cooling floor device 32, and the subsequent slow cooling is performed while being conveyed by the same operation of the latter cooling floor device 32. While being conveyed from the cooling floor device 30 to the subsequent cooling floor device 32 in this way, the rectangular steel pipe 3 is contracted as it is cooled as shown in FIGS. Similarly, the outer dimension of the inner diaphragm 10 is L
Becomes

Then, the post-stage cooling is performed and the post-stage cooling floor device 32 is provided.
The rectangular steel pipe 3 which has reached the end portion of the above is transferred to a take-out conveyor device 34, and thereafter, is conveyed to a not-shown front end cutting device, rear end cutting device, cleaning device, and rust prevention device,
After each treatment, it is stored as product steel pipe.

For the square steel pipe 3 stored as a product steel pipe as described above or the square steel pipe 3 at an appropriate process portion after being taken out from the post-stage cooling floor device 32, the internal inner diaphragm 10 and the backing material 12 are provided. Are fixed by welding.

That is, as shown in FIG. 9, a support device 60 for supporting and rotating the rectangular steel pipe 3 in a horizontal direction is provided at the welding work site. The support device 60 includes a pair (single or plural) of drive support portions 61 and a floating support portion 62 provided at one (or a plurality of) positions between the drive support portions 61. You.

Each of the supporting portions 60 and 61 is connected to the lower frame 6.
3, a plurality of small-diameter gears 64 disposed on the frame 63, a large-diameter gear 65 meshed and mounted between the small-diameter gears 64, and the like. Is linked to a driving device (motor or the like) 66 provided on the frame 63 side. Here, the large-diameter gear 65 has a ring shape, and an inner hole thereof is formed as a rectangular hole 67 through which the square steel pipe 3 can be inserted.

The square steel pipe 3 is inserted into the large-diameter gear group 65 by moving the square steel pipe 3 in the axial direction of the pipe at this welding work site, or by inserting the square steel pipe 3 in another place. The large-diameter gear 65 group is fitted to the outside, and the square steel pipe 3 is transported by a crane, a forklift, or the like, and the large-diameter gear 65 group is mounted on the small-diameter gear 64 of each of the supporting portions 61 and 62 while meshing with each other. And so on.

As shown in FIGS. 10 and 13, the corners 3B of the rectangular steel pipe 3 set as described above are attached to the corners 3B.
Through holes 4 are formed (pierced) in the plate thickness direction at the ends of the pair of flat plate portions 3A forming B, respectively. These through holes 4 are formed so as to communicate with the welding space X.

As shown in FIGS. 9 to 11, a welding machine 70 and a backing device 74 are provided at the welding work site. The welding machine 70 is an electroslag welding machine, an electrogas arc welding machine, or the like. The welding wire 71 has a through hole 4 in the vertical direction above the square steel pipe 3.
And a ground 72 is configured to be freely connected to a position away from the rectangular steel pipe 3.

The backing device 74 includes a frame 75
An upward cylinder 76 provided on the frame 75, a piston rod 77 fitted inside the cylinder 76 so as to be able to move up and down, and an upper and lower part below the square steel pipe 3 integrated with the upper end of the piston rod 77. A backing material (asbestos, rock wool, etc.) 78 that can be inserted from below into the through hole 4 in the direction, and a spring (elastic body) 79 that urges the backing material 78 to move in the insertion direction. The mounting position of the backing device 74 is configured to be freely changeable.

The welding operation will be described below. Supporting device 60
In a state where the rectangular steel pipe 3 is supported sideways on the upper side, the driving device 66 is driven as necessary, and the rectangular steel pipe 3 is rotated to adjust the phase of the inner diaphragm 10. In this state, FIG.
0, as shown in FIG. 11, through the through hole 4 formed in the square steel pipe 3 and utilizing the welding space X, the flat plate portion inner surface 3a
The welding Y between the inner diaphragm 10 and both backing materials 12
Is performed. Note that the backing device 74 is set prior to the welding operation. That is, the set is made by inserting the backing material 78 from below into the lower through hole 4 formed corresponding to the welding equivalent portion, and urging the backing material 78 to move in the insertion direction by the spring 79. I can do it. At this time, the horizontal through hole 4 is closed by another backing material 78.

In this state, the welding wire 71 is inserted into the upper through-hole 4 of the square steel pipe 3 from above and then inserted downward in the welding space X, so that an electroslag welding machine or an electrogas arc welding is performed. Diaphragm 1 against flat plate inner surface 3a by a machine or the like.
The welding Y between the backing material 12 and the backing material 12 can be sequentially performed from below to above. At that time, the backing material 78 can prevent the molten metal from leaking downward or to the side from the through hole 4, and the molten metal can leak to the front and rear sides of the flat plate inner surface 3a.
This can be prevented by the above-described press-bonding at the time of drawing.

The welding Y as described above is applied to the inner diaphragm 1
0 on one side, and similarly on the other side. The welding Y may be performed simultaneously on both side edges. After the desired welding Y is performed on the left and right side edges in this manner, the welding Y between the upper edge and the lower edge is performed by moving the upper edge and the lower edge to the both edges. For this purpose, the rectangular steel pipe 3 is rotated by 90 degrees. The rotation of the rectangular steel pipe 3
By synchronously driving the drive support 1, the drive support portion 61 and the floating support portion 62 can support and guide the drive.

Thus, the operation of attaching the inner diaphragm 10 to the square steel pipe 3 is completed. The through hole 4 is
Filled by overlay welding. As described above, for example, a column (an example of a steel pipe with an internal reinforcing member) 5 as shown in FIG. 12 is manufactured, and a beam 6 is welded to the outside of the portion of the column 5 to which the inner diaphragm 10 is attached.
Are linked by

Next, second and third embodiments of the present invention will be described with reference to FIGS. That is, in the above-described first embodiment, the outer surface 12a of the backing material 12 is horizontal and straight, whereas in the second embodiment shown in FIG. It is formed on the outer surface 12b, and in the third embodiment shown in FIG. 14, an uneven portion 12c having a plurality (two) or a single ridge on the outer surface 12a is formed.

In the second embodiment shown in FIG.
As shown by the solid line, the inner diaphragm 10 can always be inserted smoothly and lightly by the guiding action of the inclined outer surface 12b. When the square steel pipe 3 is drawn, the upper edge corner forming the inclined outer surface 12b is easily cut into the flat plate inner surface 3a as shown by the imaginary line, so that the inner diaphragm 10 side is formed. It is firmly bonded to the square steel pipe 3.

Further, in the third embodiment shown in FIG. 14, as shown by the solid line, a gap S is formed between the ridge portion of the uneven portion 12c and the inner surface 2a of the flat plate portion. The diaphragm 10 can be inserted without being caught or clogged. When the rectangular steel pipe 3 is drawn and formed, as shown by the imaginary line, the ridges of the concave and convex portions 12c are easily cut into the inner surface 3a of the flat plate portion, so that the inner diaphragm 10 side has the rectangular steel pipe 3 Is firmly bound to

Next, a fourth embodiment of the present invention will be described with reference to FIG.
5, will be described with reference to FIG. That is, the internal reinforcing material is a cylindrical internal reinforcing material 80, which is a rectangular tube (an example of a tube) 81 and a rectangle located in the middle of the rectangular tube 81 and integrated with the rectangular tube 81. Plate (an example of diameter reduction block)
82. Almost the entire outer peripheral surface of the rectangular plate 82 is brought into contact with the inner peripheral surface of the rectangular tube body 81 and is integrated by welding.

At this time, the distance between the outer surfaces of the rectangular tube 81, which is the outer dimension L of the cylindrical internal reinforcing material 80, is equal to (slightly larger) the inner surface width W of the square steel pipe 3 which is the final product. L ≧ W is formed. However, the inner surface width dimension Wa of the polygonal hollow steel pipe 2 is formed to be slightly larger than the inner surface width dimension W of the rectangular steel pipe 3 and W <Wa. There is a gap S between them.

An internal reinforcing material supply device 90 provided on the side of the loading floor device 20 has an arm body 91 which can be inserted into and removed from the polygonal hollow steel pipe 2 and which can move up and down, and a free end of the arm body 91. The rectangular tube 81 is provided with a clamp device 92 or the like that can clamp the rectangular tube 81 from inside.

In the fourth embodiment, first, FIG.
As shown by the solid line in FIG. 5, at the position where the internal reinforcing material supply device 90 is pulled out (retracted), the cylindrical internal reinforcing material 80 is clamped (supported) by the clamp device 92. The polygonal hollow steel pipe 2 already contains one square internal reinforcing material 8.
0 is inserted. In this state, the arm body 91 is moved into the polygonal hollow steel pipe 2 and moved, and as shown by a virtual line in FIG.
A cylindrical internal reinforcing material 80 is provided up to a predetermined position in the polygonal hollow steel pipe 2.
Insert.

At this time, the outer dimension L of the cylindrical internal reinforcing material 80
However, since the inner surface width dimension Wa of the polygonal hollow steel pipe 2 is smaller than the inner surface width dimension Wa and the gap S is formed between the outer surface 81a of the rectangular tube body 81 and the flat plate portion inner surface 2a, the cylindrical internal reinforcing member 80 is caught or clogged. It can be inserted without generating.

After completing the supply (insertion) step of the cylindrical internal reinforcing material 80, heating and hot drawing are performed in the same manner as in the first embodiment. The inner surface 3a of the flat plate portion of the rectangular steel pipe 3 is the outer surface 81a of the rectangular pipe 81.
(Pressing contact), and furthermore, it is slightly indented. As a result, the cylindrical inner reinforcing member 80 side is fixed to the square steel pipe 3 in a shrink-fit state, thereby forming an overlapped portion 83 of the square pipe 81 and the square steel pipe 3 as shown in FIG.

In the rectangular steel pipe 3 which has been cooled and stored as a product, holes 84 are provided at a plurality of positions (an arbitrary number and an arbitrary arrangement suitable for transmitting stress) of the overlapping portion 83 of the square steel tube 3. Formed by the device. At this time, even if the plate pressure of the flat plate portion 3A of the rectangular steel pipe 3 is thin, the thickness can be increased by the rectangular pipe body 81 of the cylindrical internal reinforcing material 80, so that a hole 84 having a sufficient length is formed.

After that, the connecting member 85 is acted on each hole 84 to connect the rectangular steel pipe 3 and the rectangular pipe part 81 of the cylindrical internal reinforcing material 80, thereby forming another material connecting part 86 in the overlapping part 83. obtain. Here, the coupling tool 85 is of a bolt type that can be inserted into the hole 84 from the outside and then form a nut portion inside by a screwing action by rotation. Good. By operating the plurality of coupling tools 85 in this manner, the connection between the rectangular steel pipe 3 and the cylindrical internal reinforcing material 80 can be performed sufficiently firmly. As described above, the support 5 is manufactured, and the beam 6 is connected to the outside of the other material connecting portion 86 of the support 5.

Next, a fifth embodiment of the present invention will be described with reference to FIG.
7, will be described with reference to FIG. That is, as shown in FIG. 17, for example, in manufacturing a large-diameter rectangular steel pipe, a round steel pipe 8 having a predetermined diameter, plate thickness, and length corresponding to the large-diameter rectangular steel pipe is loaded on the loading floor apparatus 20 as a raw pipe. Be prepared. The loading floor device 20 supports a plurality of round steel pipes 8 in parallel and transports the steel pipes 8 in a horizontal direction perpendicular to the length direction. During this intermittent conveyance, a circular tubular internal reinforcing material (an example of an internal reinforcing material) is placed in the round steel pipe 8 by the internal reinforcing material supply device 90 similar to that described in the fourth embodiment.
95 is inserted (see FIG. 18A).

The round steel pipe 80 conveyed to the terminal end of the carrying-in floor unit 20 is carried into the heating furnace 22 and is conveyed in the heating furnace 20 in a lateral direction perpendicular to the length direction thereof. Meanwhile, the material is heated at a high temperature A above the A3 transformation point. The round steel pipe 8 thus heated and conveyed to the vicinity of the carry-out port is carried out through the carry-out port which is opened for a short time, and is taken out of the heating furnace 20 onto the roller conveyor 6.

Then, the round steel pipe 8 is transferred to the welding seam position adjusting device 100, where the support roll 101 and the presser roll 1 are held.
By rotating the seam weld around the pipe axis via a 02 or the like, the positions of the seam welds are aligned in a certain direction. The round steel pipe 8 from the welding seam position adjusting device 100 is carried into a round steel pipe forming mill 103, is hot-formed in a drawing shape through a plurality of sizing rolls 104 and the like, and is formed into a square shape as a final product. The steel pipe is refined to a predetermined diameter so as to be finished in a predetermined size, thereby forming a purified round steel pipe 9.

The refined round steel pipe 9 thus refined by the group of round steel pipe forming mills 103 is carried into the former square steel pipe forming mill 105. Here, hot forming (forming temperature A ₃₎ is performed through a plurality of conical rolls 106 and the like.
In this case, the polygonal hollow steel pipe 2 immediately after hot forming is formed such that each flat plate portion is formed into an outwardly arcuate surface along the squeezed surface.

Next, the polygonal hollow steel pipe 2 is carried into a rear-stage rectangular steel pipe forming mill 107. This post-stage square tube forming mill 1
In step 07, hot forming (forming temperature, A3 transformation point or higher) is performed through a plurality of flat rolls 108 and the like, and the subsequent (final) drawing forming of the polygonal hollow steel pipe 2 is performed. Thus, a large-diameter rectangular steel pipe 3 having a predetermined size and being a final product is hot-formed. At this time, the tubular internal reinforcing member 95 is similarly formed by hot drawing forming, and the flat plate portion inner surface 3a of the rectangular steel pipe 3 abuts on the outer surface 95a of the cylindrical internal reinforcing material 95 (pressure contact). ) And furthermore, it is slightly indented. As a result, the cylindrical internal reinforcing material 95 is fixed to the square steel pipe 3 by shrink fitting (see FIGS. 18B and 18C), so that the overlapping portion 96 between the cylindrical internal reinforcing material 95 and the square steel pipe 3 is formed. It is formed.

Hereinafter, various embodiments of the present invention will be described with reference to the drawings. Here, a description will be given of a state in which an internal reinforcing material is fitted inside the original tube, and the original tube is joined by hot drawing of the original tube.

That is, FIG. 19 shows the sixth embodiment, in which a cylindrical internal reinforcing material (an example of an internal reinforcing material) 110
Is formed by a rectangular tube (an example of a tube) 111 and a cross-shaped frame (an example of a compression inhibitor) 112, so that the overlapping portion 9 is formed.
6, the other material connecting portion 86 is formed.

FIG. 20 shows a seventh embodiment. For example, a cylindrical internal reinforcing material (an example of an internal reinforcing material) is added to a purified round steel pipe 9 hot-formed in the fifth embodiment.
80 is internally fitted and connected. This tubular internal reinforcement 54
Is formed by a circular tube body (an example of a tube body) 81 and a circular plate body (an example of a compression preventing body) 82, and the overlapping portion 83 forms the other material connecting portion 86.

FIG. 21 shows an eighth embodiment. For example, a cylindrical internal reinforcing material (an example of an internal reinforcing material) is added to a purified round steel pipe 9 hot-formed in the fifth embodiment. 115 is internally fitted and connected. The cylindrical internal reinforcing member 115 is formed by a circular tube (an example of a tube) 116 and a cross-shaped frame (an example of a compression preventing portion) 117. Are formed.

FIG. 22 shows a ninth embodiment. For example, in the fourth to eighth embodiments, the outer surfaces of the cylindrical internal reinforcing members 80, 95, 110, and 115 are provided on the uneven portion 120. Is formed.

In the ninth embodiment, the rectangular steel pipe 3 is drawn and formed, so that the concave and convex portions 120 are easily formed into the flat plate portion inner surface 3a.
The 0, 95, 110, and 115 sides are more firmly bonded to the square steel pipe 3. This makes it possible to omit the coupling by the coupling tool 85 or the like.

FIG. 23 shows a tenth embodiment. In each of the embodiments, a cylindrical internal reinforcing material (internal reinforcing material) 125 includes a square or circular cylindrical body 126 and a cylindrical or cylindrical cylindrical body 126. The inner diaphragm 128 has a square plate shape or a circular plate shape which is located at two places (two or more places) in 126 and is integrated by welding 127 or the like.

According to the tenth embodiment, the cylindrical internal reinforcing material 125 is inserted into a predetermined position in the polygonal hollow steel pipe 2 and is subjected to drawing forming, whereby a square steel pipe (product steel pipe) is formed. 3) The 3 or refined round steel pipe 9 is hot formed.

FIG. 24 and FIG. 25 show an eleventh embodiment. For example, in the first embodiment, a polygon supported laterally by the loading floor device 20 is provided at the portion of the loading floor device 20. An internal reinforcing material supply device 40 for inserting an internal diaphragm (an example of an internal reinforcing material) 10 into a predetermined position in the hollow steel pipe 2 is arranged on both sides.

In the eleventh embodiment, the polygonal hollow steel pipe 2 which is intermittently transported in the horizontal direction perpendicular to the length direction on the loading floor device 20 is supplied with the internal reinforcing material on both sides. The device 40 is stopped with its respective ends facing each other. At this time, in each of the internal reinforcing material supply devices 40, the inner diaphragm support device 45 at the position where the inner diaphragm supporting device 45 is pulled out (retracted).
In addition, an inner diaphragm 10 in which a backing material 12 is integrated and one set of two sheets is supported.

In this state, the cylinder device 43 is operated, and the arm body 42 is protruded and moved with respect to the main body 41. As shown by the phantom line in FIG. 2), a pair of inner diaphragms 10 are inserted into predetermined positions. At that time, the insertion movement of the both arms 42 is position-controlled by the control device. After the supply (insertion) process of the inner diaphragm 10 is completed,
Inner diaphragm 10 by inner diaphragm support device 45
Is released, and the arm 42 is pulled out.

The polygonal hollow steel pipe 2 in which the inner diaphragm 10 has been inserted at two predetermined positions in this manner is shown in FIG.
As shown in FIG.
After being heated at high temperature A together with the diaphragm 10, it is carried out of the heating furnace 22. Then, the polygonal hollow steel pipe 2 is subjected to the former stage drawing in the former stage square steel tube forming mill 23, and then to the latter stage (final stage) in the latter stage square steel tube forming mill 25, and thus has a large diameter having a predetermined size. Then, a square steel pipe (product steel pipe) 3 having a rectangular shape is hot-formed.

As described above, the hot-formed square steel pipe 3 is received by the cooling floor device 30 and is transported in the transverse direction perpendicular to the longitudinal direction.
Is cooled in an air-cooled manner, that is, gradually cooled, and then transferred to and transferred to the downstream cooling floor device 32 to perform downstream cooling. Then, the rectangular steel pipe 3 which has reached the end of the post-stage cooling floor device 32 is transferred to a take-out conveyor device 34, and thereafter, is conveyed to a front end cutting device, a rear end cutting device, a cleaning device, and a rust prevention device, and each of them. By being processed, it is stored as a product steel pipe in which the inner diaphragm 10 is inserted at two predetermined positions. Note that two inner diaphragms 10 and a backing material 12 are welded and fixed to the square steel pipe 3.

In the eleventh embodiment, the loading floor device 2
Although the polygonal hollow steel pipes 2 stopped at 0 are simultaneously supplied by the internal reinforcing material supply devices 40 on both sides, the supply may be performed separately at different stop positions. . Further, for example, by operating the internal reinforcing material supply device 40 on one side twice, the inner diaphragm 10 can be supplied to three predetermined positions at the center and both ends in the length direction. Further, for example, the internal diaphragm 10 can be supplied to a plurality of predetermined positions by disposing the internal reinforcement supply device 40 on only one side and operating the internal reinforcement supply device 40 a plurality of times.

As described above, by various combinations of the supply types, it is possible to obtain a product steel pipe in which the inner diaphragm 10 is inserted at two or more predetermined positions (a large number of positions).
Although the eleventh embodiment has been described in the first embodiment, the same applies to the fifth embodiment shown in FIGS. 17 and 18, for example. In each of the above-described embodiments, the square steel pipe 3 is mainly a large-diameter steel pipe,
The size is, for example, the thickness t is 16 to 60 mm, and the material is SN.
400 B to SN490 B and SM520 B, outer diameter is 450 to 85
0 mm. As the polygonal hollow steel pipe 2, for example, a one-seam square steel pipe formed by hot roll forming, a two-seam square steel pipe formed by butt-welding a pair of grooves formed by hot press forming, and a pair of rolled grooves are welded. A two-seam square steel pipe, a pair of rolled angle
Off-the-shelf large-diameter steel pipes such as two-seam square steel pipes, four-sided boxes, and seamless steel pipes welded face to face are used.

In the first embodiment described above, the inner diaphragm 10 is handled in a state where two sheets are integrated, but this is the same idea, and three sheets (a plurality of sheets) are handled as one set. Alternatively, the inner diaphragm 10 can be handled alone (one sheet).

In the fourth embodiment and the like described above, the square steel pipe 3 having a square cross section is manufactured, and the cylindrical internal reinforcing member 80 is formed.
Which can be manufactured in the same way for rectangular steel pipes with a rectangular cross section and can be fitted with internal reinforcements. By changing the roller arrangement of the double-sided steel pipe forming mills 23 and 25, hot forming of a polygonal steel pipe such as a pentagonal steel pipe or a hexagonal steel pipe and mounting of an internal reinforcing material can be performed.

In the above-described fourth embodiment and the like, the other material connecting portion 86 is formed by arranging a pair of upper and lower internal reinforcing members at predetermined intervals. The other material connecting portion 86 may be formed by disposing the internal reinforcing material.

[0089]

According to the first aspect of the present invention, the internal reinforcing material having a necessary length with respect to the inside of the original pipe is utilized by utilizing a sufficient gap generated between the outer surface of the internal reinforcing material and the inner surface of the original pipe. Can be easily and smoothly inserted into a predetermined position without being caught or clogged. By hot drawing of the original pipe, the product steel pipe can be made to have good properties, and the gap can be automatically filled to abut (press) the inner surface of the product steel pipe against the outer surface of the internal reinforcing material. The internal reinforcing material can be suitably fixed to the product steel pipe.

According to the second aspect of the present invention,
While the inner diaphragm with the backing material integrated with the inner surface of the original tube can be easily and smoothly inserted into the original tube by using a sufficient gap, the welding connection such as electroslag welding uses molten metal. It can be performed well without leaking to the outside.

According to the third aspect of the present invention, the inner surface of the product steel pipe is brought into contact with the outer surface of the internal reinforcing material (press-contact) by hot drawing of the original pipe, and the internal reinforcing material is brought into contact with the product steel pipe. When it is fixed on the inner surface of the product steel pipe, the concave and convex portions are recessed into the inner surface of the product steel pipe, and the internal reinforcing material and the product steel pipe can be strongly integrated.

Further, according to the fourth aspect of the present invention, it is possible to obtain a product steel pipe in which internal reinforcing members having inner diaphragms at a plurality of positions are inserted at predetermined positions, thereby improving strength and diversifying the purpose of use. Easy to deal with.

[Brief description of the drawings]

FIG. 1 shows a first embodiment of the present invention and is an explanatory diagram of steps in a method for manufacturing a steel pipe with an internal reinforcing material.

FIG. 2 is a process perspective view in a method for manufacturing the steel pipe with an internal reinforcing material.

FIG. 3 is a side view of an internal reinforcing material supply device in the method of manufacturing a steel pipe with internal reinforcing materials.

FIG. 4 is a partially cutaway side view before inserting the internal reinforcing material in the method of manufacturing the steel pipe with the internal reinforcing material.

FIG. 5 is a longitudinal sectional side view of a main part when the internal reinforcing material is inserted in the method of manufacturing the steel pipe with the internal reinforcing material.

FIG. 6 is a vertical cross-sectional side view of a main part when the internal reinforcing material supply device is withdrawn in the method for manufacturing a steel pipe with internal reinforcing materials.

FIG. 7 is a longitudinal sectional front view when the internal reinforcing material is inserted in the method of manufacturing the steel pipe with the internal reinforcing material.

FIG. 8 is a longitudinal sectional front view after hot drawing in the method for manufacturing the steel pipe with internal reinforcing members.

FIG. 9 is a side view of a welding work site in the method of manufacturing a steel pipe with internal reinforcing members.

FIG. 10 is a longitudinal sectional side view of a main part at the time of welding in the method for manufacturing a steel pipe with internal reinforcing members.

FIG. 11 is a partially cutaway front view at the time of welding in the method for manufacturing a steel pipe with internal reinforcing members.

FIG. 12 is a vertical cross-sectional view showing a state in which a beam is connected to the manufactured column.

FIG. 13 shows the second embodiment of the present invention and is a longitudinal sectional side view of a main part when an internal reinforcing material is inserted in a method for manufacturing a steel pipe with an internal reinforcing material.

FIG. 14 shows a third embodiment of the present invention, and is a longitudinal sectional side view of a main part when an internal reinforcing material is inserted in a method of manufacturing a steel pipe with an internal reinforcing material.

FIG. 15 shows a fourth embodiment of the present invention, and is a longitudinal sectional side view of an internal reinforcing material insertion portion in a method for manufacturing a steel pipe with internal reinforcing materials.

FIG. 16 is a partially cutaway perspective view showing a state in which the beam is connected to the column manufactured as above.

FIG. 17 shows a fifth embodiment of the present invention, and is a process perspective view in a method for manufacturing a steel pipe with an internal reinforcing member.

FIG. 18 is a process explanatory view in the method of manufacturing the steel pipe with the internal reinforcing material, wherein A is a front view when the internal reinforcing material is inserted, B is a front view after hot drawing, and C is a hot view. It is a vertical side view after drawing.

FIG. 19 shows the sixth embodiment of the present invention and is a partially cutaway perspective view of a steel pipe with an internal reinforcing member.

FIG. 20 shows the seventh embodiment of the present invention, and is a partially cutaway perspective view of a steel pipe with an internal reinforcing member.

FIG. 21 shows the eighth embodiment of the present invention, and is a partially cutaway perspective view of a steel pipe with an internal reinforcing member.

FIG. 22 shows a ninth embodiment of the present invention, and is a longitudinal sectional view of a steel pipe with an internal reinforcing member.

FIG. 23 shows the tenth embodiment of the present invention and is a longitudinal sectional view of a steel pipe with an internal reinforcing member.

FIG. 24 shows the eleventh embodiment of the present invention and is a process perspective view in a method for manufacturing a steel pipe with an internal reinforcing member.

FIG. 25 is a side view of an internal reinforcing material supply device part in the method of manufacturing a steel pipe with internal reinforcing materials.

[Explanation of symbols]

 2 Polygonal hollow steel pipe (raw pipe) 3 Square steel pipe (product steel pipe) 3a Flat plate inner surface (product steel pipe inner surface) 5 Prop (steel pipe with internal reinforcing material) 8 Round steel pipe (raw pipe) 9 Refined round steel pipe 10 Inner diaphragm ( 12 Backing material 12a Outer surface of backing material 12b Inclined outer surface 12c Irregularities 20 Loading floor device 21 Roller conveyor 22 Heating furnace 23 Front stage square tube forming mill 25 Rear stage square tube forming mill 30 Cooling floor unit 34 Take-out conveyor unit Reference Signs List 40 internal reinforcing material supply device 45 internal diaphragm supporting device 60 supporting device 70 welding machine 74 backing device 80 cylindrical internal reinforcing material (internal reinforcing material) 81 square tube (tube) 81a outer surface of square tube 82 rectangular plate ( Diameter preventing body) 90 Internal reinforcing material supply device 95 Cylindrical internal reinforcing material (Internal reinforcing material) 95a External surface 100 Weld seam position adjustment Apparatus 105 Front-stage square steel tube forming mill 107 Rear-stage square steel tube forming mill 110 Cylindrical internal reinforcing material (internal reinforcing material) 115 Cylindrical internal reinforcing material (internal reinforcing material) 120 Uneven portion 125 Cylindrical internal reinforcing material (internal reinforcing material) 126 Cylindrical body 128 Inner diaphragm A High-temperature heating B Heat dissipation L Outer dimension of internal reinforcing material L + α Outer dimension of internal reinforcing material during thermal expansion S Gap W Inner width dimension of rectangular steel pipe 3 Wa Inner width dimension of polygonal hollow steel pipe 2 W + α Rectangular steel pipe Inner surface width dimension during heat expansion of No. 3 R Radius of curvature of corner 3B of square steel pipe 3 Ra Radius of curvature of corner 2B of polygonal hollow steel pipe 2 X Welding space Y Welding

Claims (4)

[Claims] After inserting an internal reinforcing material into a predetermined position in a raw pipe having a size slightly larger than a product steel pipe, the raw pipe is heated together with the internal reinforcing material, and the raw pipe is hot drawn and formed.
A method of manufacturing a steel pipe with an internal reinforcing material, wherein the steel pipe is formed into a product steel pipe, the inner surface of the product steel pipe is brought into contact with the outer surface of the internal reinforcing material, and the product steel pipe is cooled together with the internal reinforcing material. 2. The internal reinforcing material is an inner diaphragm having a backing material integrated therein, and after cooling and shrinking the product steel pipe, the backing material and the inner diaphragm are welded to the inner surface of the product steel pipe. The method for producing a steel pipe with an internal reinforcing material according to claim 1. 3. The method for manufacturing a steel pipe with an internal reinforcing material according to claim 1, wherein an uneven portion is formed on an outer surface of the internal reinforcing material. 4. The internal reinforcing material according to claim 1, wherein the internal reinforcing member is constituted by a cylindrical body and an internal diaphragm located and integrated at a plurality of positions in the cylindrical body. A method for producing a steel pipe with an internal reinforcing material according to the above.