JPH08118010A - Manufacture of medium and small welded shape using large i-beam manufacturing equipment - Google Patents

Abstract

PURPOSE: To efficiently manufacture a medium or small welded shape whose size is deviated from the manufacturable range of a manufacturing equipment using a large I-beam manufacturing equipment. CONSTITUTION: In a manufacturing method of a welded shape, a flange member 3 is assembled on each side of a web 1 using an I-beam manufacturing equipment 10 and welded to manufacture a large I-shape by using a steel plate having cut slit therein where a partially cut-and-left part is provided on the cutting line of the web 1 whose width is in the manufacturable range of the large I-beam manufacturing equipment 10. Then, a medium or small welded shape is manufactured by using the large I-beam manufacturing equipment where the flanges 3, 3 of a plurality of T-shapes obtained by cutting the cut-and-left part of the web 1 are restricted to each other in a back-to-back manner to be integrated, and another flange 3 is assembled to the end of the web 1 and welded to the web 1, and restriction of the flanges 3, 3 which are restricted to each other in a back-to-back manner is released and separated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing welded steel such as girders, beams, columns and lateral ribs, diaphragms and the like of steel structures such as bridges, building steel frames and shipbuilding.

[0002]

2. Description of the Related Art Welded I-section steels, H-section steels and T-section steels used as members constituting steel structures such as bridges, steel frames and shipbuilding are cut into final component shapes such as individual flanges and webs constituting them. Piercing things, assembling,
It was generally manufactured by performing processing in each process such as welding and straightening. In recent years, automation lines such as NC girder radial drilling machines and I-girder manufacturing equipment have been introduced to the production site due to demands for labor saving and cost reduction in manufacturing steel structures. Since such automated line equipment is often designed and manufactured for the production of large-sized members, it is not suitable for the production of small and medium-sized members. For example, the manufacturable range of an "I-digit automatic manufacturing device" is a flange width of 200 to 8
The web size was 00 mm and the web height was 1,400 to 3,000 mm, and it was not possible to manufacture small and medium-sized members having sizes smaller than that.
Further, in the production of the welded T-section steel, a straightening process using a machine such as a roller or a press or heating is necessary in order to correct large bending deformation due to welding.

[0003]

The members such as flanges and webs that make up welded steel are small and light in weight as a single item and have a large number of parts, which is not only inefficient in logistics work such as transportation and horizontal holding, but also inventory management of the members. And it takes a lot of time and effort for logistics management. Especially in a production factory where large-sized members and small and medium-sized members are mixed, such as a bridge manufacturing factory, the capacity of the crane and the space of the assembly processing site are set according to the handling of large-sized members, so small and lightweight members are used. Dealing with is very inefficient. In addition, it is difficult to automate the drilling work of small and lightweight members and to make NC, and it is necessary to rely on human hands.
When attempting to automate the production of welded H-section steel and welded T-section steel, a dedicated line was required, which was unsuitable in terms of equipment cost for the production of a large amount of small quantities. In addition, with the increase in size of bridges in recent years, the main body of production has shifted from plate girders to box girders, and in addition to producing large I-type steel such as the main girders of plate girders,
It is becoming necessary to improve the productivity of small and medium-sized steel such as box girders, cross girders, and transverse ribs. Further, in terms of quality, it is preferable to minimize member assembly dimensional errors and deformation due to heat during welding and cutting of welded steel, and to omit or simplify the correction process.

The present invention has been made under such a background, and is a production factory where small-sized members and parts are mixed and produced by using a large-sized I-girder manufacturing apparatus. It is an object of the present invention to provide a method for efficiently manufacturing various types and sizes of welded steel with a predetermined quality.

[0005]

In order to achieve the above-mentioned object, the present invention provides a method for producing a welded steel in which a large I
Using a slit-cut steel sheet having a partial cutting residue on a cutting line of a large plate of a web material having a width within the manufacturing range of the girder manufacturing apparatus, the I-girder manufacturing apparatus is used to form flanges on both sides of the web material. After the materials are assembled and welded to produce a large I-shaped steel, the flanges of the T-shaped steel pieces obtained by cutting the cutting residue of the web material are bound back-to-back to form an integrated web material. Using a large I-girder manufacturing apparatus, which is characterized by assembling a new flange material at the end of the and welding it with the web material, and then releasing the constraint of the flange material restrained back to back and separating. It is constructed by the method of manufacturing small and medium welded steel.

Further, according to the present invention, the same steps as those in the method for producing a medium-small welded steel using the large I-girder producing apparatus are repeated a plurality of times by using a web material provided with a plurality of rows of slit cutting. It is configured by a method of manufacturing a medium-small welded steel using a large-sized I girder manufacturing apparatus for manufacturing three or more small-medium welded steels.

[0007]

According to the present invention, a large plate having a web material, which is a constituent member of welded steel, is provided with a single or a plurality of cutting slits in the longitudinal direction at the web height of the product to be finally obtained. The width of this large plate needs to be within the manufacturable range (B _{1 to} B ₂ ) of a large I-digit manufacturing apparatus. The reason for providing the cutting slit in the web material beforehand is that it is possible to cut in a short time when manufacturing the mold steel, prevent large bending deformation at the time of cutting, maintain the shape when manufacturing the mold steel and fix the work when using the NC drilling machine. This is because Slit cutting is performed by automatic gas cutting, plasma cutting, cutter cutting, or the like, and as shown in FIG. 4, the cutting shape of the cutting slit 2 is such that slit cutting portions S ₁ and uncut portions S ₂ are alternately formed. To It is necessary to determine the slit cutting length so as not to deform when handling or inverting the large plate. The shape steel is manufactured by setting the large-sized slit-cut web material in a large I-girder manufacturing apparatus, assembling and welding flange materials on both sides to first manufacture a large I-shape steel, and then leaving a cutting slit left uncut. The parts are separated and two T-section steels are obtained. The flange material may be a cut plate of a predetermined size manufactured by any means. However, as shown in FIG. 7 (a), when a large plate is slit-cut like the web material, an NC drilling machine of the NC drilling machine is used. Work becomes easy and large bending due to cutting can be prevented.

The two T-section steels are set in the I-girder manufacturing apparatus in a state where the flanges are back to back and restrained by a restraining jig such as a bolt nut or a vise, and the flange materials are assembled and welded at both ends of the web material. By doing so, it is possible to obtain two weld type steels smaller than the above-mentioned large type steel. When the cutting slit is provided at the center of the web material, the obtained welded steel becomes a medium-sized steel having a web height of 1/2 of that of the large-sized steel initially produced. If the web material is provided with a plurality of cutting slits, the same steps can be repeated to obtain a smaller die steel. For example, from the one provided with three cutting slits having the same width, four shaped steels having a web height of 1/4 of the first large shaped steel can be manufactured. When the final product is T-section steel, it may be taken out without assembling and welding the flange material in the above process. As described above, in the present invention,
A large I-shaped girder manufacturing machine with a large width plate within the manufacturable range provided with cutting slits at the dimensions of the final web height. After manufacturing a large model steel, dividing it and restraining the flange materials back to back again. Since I am trying to make a model steel,
Since the width at the time of manufacturing does not change, it is possible to manufacture a die steel smaller than the manufacturable range with a large I-girder manufacturing apparatus.

[0009]

An embodiment of the present invention will be described with reference to the drawings.
FIG. 1 shows a state in which a welding type steel according to the present invention is manufactured by using a large I-girder manufacturing apparatus. 2 and 3 show the I-digit automatic manufacturing line 11 and the I-digit manufacturing process. FIGS. 4 and 5 show four small I-girder welded steels having the same web height, which are manufactured by using the large I-girder manufacturing apparatus according to the first embodiment of the present invention. The large I used in this example
As shown in FIG. 1, the girder manufacturing apparatus is a flange gripping pressing device 1
2. The pedestals 14a and 14b composed of a traveling device equipped with the transfer roller 18 and the tack welder 13 are arranged on opposite sides of each other, and one pedestal is fixed and the other is movable in the left-right direction. The pair of flange gripping and pressing devices 12 can be rotated 90 degrees to each other by a cylinder device 19, and transfer rollers 18 are movably mounted on the fixed mounts 14a and movable mounts 14b. The flanges 3 are clamped and centered by each, and then the movable base 14 is adjusted to the width B of the web 1.
After moving b and placing the web material 1 on the moving roller 18, the respective pedestals are erected 90 degrees. Next, after pressing the flange member 3 from the rear of each flange member 3 by a cylinder device to crimp the flange member 3 to the web member 1, the downward intersection of the web member 1 and each flange member 3 is turned upward by the welding device 13. Fillet welding is performed at a predetermined position and the tack welding is completed (FIG. 3A). Next, after opening the cylinders and clamps of the respective pedestals 14a and 14b, the assembled steel mold is transferred to the main welding device 15 by driving the transfer roller 18, and the upper welding of the web material 1 and the flange material 3 (Fig. 3 (b)), after being reversed by the reversing device 16 (FIG. 3 (c)), it is transferred to the main welding device 15 again and the upper welding is performed in the posture after the reversal (FIG. 3).
(See (b)), and the straightening machine 17 corrects the angular deformation of the flange material 3 and the web material 1 (FIG. 3D). Fig.3 (a)-
(D) illustrates the above process.

The I-girder manufacturing apparatus 10 can manufacture the I-girder with a flange width of 200 to 800 mm and a web height of 1,400.
˜3,000 mm, member length 5 m to 20 m.
Using this large-scale I girder manufacturing apparatus 10, the flange width 30
A first example of manufacturing the I-type welded steel 6 having a length of 0 mm, a web height of 500 mm and a length of 11 m will be described. This type steel has a web height much lower than the minimum web height B _{1 of} 1400 mm which can be manufactured by the I-beam manufacturing apparatus 10, and the apparatus cannot be used as it is. Therefore, as shown in FIG. 4 (a), three cutting slits 2 are inserted into a large plate having a width B of 2,000 mm and a length of 11 m at a 500 mm pitch of 1/4 width B, which is the dimension of the web height of the final product. It was manufactured using the web material 1. (Note that the cutting slit pitch must accurately take into consideration the cutting margin at the time of cutting.) The cutting slit 2 uses a plasma cutting machine of an automatic traveling type to cut a cutting portion S ₁ 800 mm and an uncut portion S ₂ 200 mm. Intermittent slits that repeat alternately. The cutting length S ₁ of the cutting slit 2 needs to be determined by carrying out strength calculation according to the plate thickness so as not to be deformed and damaged during handling and inversion of a large plate. Although short cuts S ₁ for employing the adverse handling method at relatively bending stress plane for hanging hacker the ends of the large plate in this embodiment, when employing the handling method by the magnet lifting, longer cut portion S ₁ can do.

FIGS. 5 (a) to 5 (i) show a case where the slit-cut web material 1 is set on the large-scale I-girder manufacturing apparatus 10.
It shows a process of manufacturing the shaped steel 6. (A) First, the large plate web material 1 provided with the cutting slits 2 is set on the transfer roller 18, and the flange material 3 subjected to the standard length cutting is pressure-bonded to the left and right ends of the web material 1 and then tack welding is performed. Then, a large type I steel (web height of 2,000 mm) is manufactured (FIG. 5A). (B) then the uncut portion S ₂ of the central cutting slits 2 is divided into two T-section steel 7a along a gas cutter or a plasma cutter (Figure 5 (b)). (C) The divided two flange members 3 of the T-shaped steel 7a are back-to-back and restrained by using a restraint jig 4 such as a bolt nut or a vise as shown in FIG. 6 (a) or (b) ( Figure 5
(C)). (A bolt nut can be applied when a bolt hole is formed in the flange 3 material.) (D) The flange material 3 is pressure-bonded to one end of the web material of each T-shaped steel 7a and temporarily welded to the large I-shaped steel. 1/2 of
A type I steel with a web height of 1,000 mm (Fig. 5) is obtained.
(D)). (E) Cut the uncut portion S ₂ of the next left or right (left in the embodiment) cutting slit 2 to obtain a web width of 1 / 4B.
A T-shaped steel 7b2 body is obtained. One of them is cut off (FIG. 5 (e)). (F) Next, the separated T-section steel of the two separated T-section steels 7b is moved in the opposite direction (right), and the flange member 3 is restrained back to back to the I-section steel moved to the left, The flange material 3 is pressure-bonded to the end of the web material 1 of the two T-shaped steels 7b and tack-welded (FIG. 5 (f)). (G) Next, the uncut portion S ₂ of the remaining cutting slit 2 (center position) is cut (FIG. 5 (g), (h) I-shaped steel and T-shaped steel 7b having a web width of 1 / 4B are used as the flange material 3 After replacing the one restrained by the right and left so that one end of the T-shaped steel web material is located outside, the flange material 3 is restrained back-to-back and the flange material 3 is temporarily attached to the one end of the web material by pressing (FIG. 5). (H)) (i) Finally, when the restraint members 4 restraining the flange members 3 back to back are removed, the size of the first large I-shaped steel (web height 2000 mm) is ¼ (web height 500 mm). Four I-type steels 6 can be obtained (Fig. 5
(I)). The I-shaped steel 6 manufactured in this manner is sent to the I-girder automatic production line 11 by the transfer roller 12 and is main-welded, inverted, and straightened to be a product. In the step (d),
After sending the temporarily welded I-shaped steels of (f) and (h) to the I-girder automatic manufacturing line 11 and commercializing them, the original I-girder manufacturing apparatus 10
May be returned to.

FIGS. 7A to 7F show a second embodiment of the present invention, which is an example in which I-shaped steels of different sizes are manufactured. According to the invention, the cutting slits 2 provided in the web material 1 have the width of the web height of the finally obtained product. This width can be selected arbitrarily. For example, as shown in the second embodiment, 1 / 2B, 1 / 4B, 1 / B for the large plate of the web material 1 having the width B within the manufacturable range of the I-type manufacturing apparatus. If the cutting slit 2 having a width of 8B is provided, the cutting slits 2 shown in FIG. 7C, FIG.
(E), I type steel of FIG.7 (f) can be obtained. Further, as the flange material 3, it is possible to use one having a predetermined size by mechanical cutting or the like in another factory, but when using a large plate provided with the cutting slit 2 as shown in FIG. When drilling the bolt holes 5 with the NC drilling machine, the fixing becomes easy. The manufacturing procedure and the obtained accuracy of the second embodiment of the present invention will be described below. FIG. 7A is a diagram showing slit cutting of a steel plate for a flange material. Plate thickness 9mm, length 11,100m with 5 slit cutting lines
m, width 1750 mm, steel plate 3a to length 11,000
Six flange materials 3 having a width of 250 mm and a width of 250 mm are cut out. In addition, NC girder radial drilling machine drilled 48 bolt holes 5 having a diameter of 24.5 mm and 128 bolt holes 5 having a diameter of 26.5 mm at both ends and the center of the slit-cut steel plate 3a, and then cut the center. The remaining part and both ends were cut into the final part shape as the flange material 3. Also, FIG.
(B) is a figure which shows the slit cutting steel plate for web materials. Plate thickness 12 mm, length 11,0 with 3 cutting lines
Thirty-two bolt holes 5 having a diameter of 24.5 mm were drilled by an NC girder radial drilling machine at both ends and the center of a steel wire 1a having a width of 00 mm and a width of B2,812 mm. This web material 1 is I
Horizontally set on the transfer rollers 18 of the fixed base 14a and the movable base 14b of the girder manufacturing apparatus 10, and as shown in FIG. 3, the two flange members 3 are temporarily assembled and formed into an I-shape. After being conveyed to the main welding machine 15, the web material 1 and the flange material 3 are welded at the same time on both sides, further reversed, and the back surface is similarly welded, and then the straightening machine 17 corrects the angular deformation due to the welding of the flange material 3. It was During this process, the I-shaped steel was cut along the slit cutting line 2 at the center, and two T-shaped steels with a web height (1 / 2B) of 1,400 mm were manufactured. Using these two T-shaped steels, the flange members 3 of each other are back-to-back, the flange members 3 are constrained to be integrated, and this is regarded as a web member,
By passing through the I-girder manufacturing apparatus 10 again, two I-shaped steels having a web height of 1,400 mm (Fig. 7 (c))
Was made at the same time. The large bend (bend in the direction perpendicular to the longitudinal direction) of this I-type steel was 2 mm or less with respect to the member length of 11 m.
Next, the I-shaped steel having slits in the web material was divided into two T-shaped steels having a web height of 700 mm. The large bend at this time was 2 mm with respect to the member length of 5.5 m.

The two flange members made of T-shaped steel are integrated with the flange members made of I-shaped steel having a web height of 1400 mm by back-to-back restraining them together, and the I-shaped girder manufacturing apparatus 10 is used. After assembling a new flange material on the end of the outer web material and welding, release the restraint of the inner flange material and separate it, web height (1 / 4B) 700 mm
Type I steel (FIG. 7D) was manufactured. The large bend of this type I steel was 2 mm or less with respect to the member length of 11 mm. Furthermore, this I-type steel is cut into two pieces at the slit position of the web material.
By dividing into a T-shaped steel with a book web height (1 / 8B) of 350 mm, and assembling and welding in the same manner as above,
I-type steel with a web height of 350 mm (Fig. 7 (e), Fig. 7)
(F)) was manufactured. The large bend of this I-type steel has a member length of 5.
The maximum was 3 mm for 5 m. The allowable values for large bends when these members are compressed are specified in the Road Bridge Specification as 1/1000 (L: member length) or less,
It was within this allowable value, had sufficient accuracy, and did not require correction of large bends. Further, the squareness of the flange (the angle between the flange and the web) is 1.5 mm / 250 mm or less,
The value was within the allowable value b / 200 (b: flange width) and was good.

FIGS. 8 (a) to 8 (d) are examples in which I type steel, T type steel, and T type steel with notch are manufactured in the third embodiment of the present invention. In this embodiment, four cutting slits 2 of 2 / 7B and 1 / 7B are previously put in a large plate (width B) of one web material 1, and one cutting slit is a hexagonal notch. The hole 9 is crossed. According to the method of the present invention, using this web material 1, FIG. 8 (b), FIG. 8 (c),
As shown in FIG. 8 (d), I-type steel, notched T-type steel, and T-type steel can be obtained. The notched T-section steel (Fig. 8 (c)) and T-section steel (Fig. 8 (d)) may be taken out before welding the flange in the above-mentioned I-section steel manufacturing process.

[0015]

EFFECTS OF THE INVENTION According to the method for manufacturing a die steel of the present invention, it becomes possible to efficiently produce a small-to-medium-sized welded die steel which is out of the manufacturable range by using a large-sized I-beam producing equipment. It is possible to effectively utilize the manufacturing equipment and reduce the equipment cost in a factory that mixes and manufactures small die steel products. In addition, cutting slits are provided intermittently in the longitudinal direction in the width of the web height of the product to be finally obtained on the web material in advance, and the uncut portion is cut at the time of manufacturing the shape steel, so the cutting is performed. Deformation such as large bending at the time hardly occurs, and the correction work can be omitted or simplified, and I size steel, CT type steel, notched type steel, H type steel of any size can be easily manufactured.

[Brief description of drawings]

FIG. 1 is a diagram showing a situation in which medium- and small-sized steel is manufactured by a large I-girder manufacturing apparatus according to an embodiment of the present invention.

FIG. 2 is an overall configuration diagram of an I-digit automatic production line.

FIG. 3 is a diagram showing an I-digit manufacturing process.

FIG. 4 is a view showing a cutting slit of the web material according to the present invention.

FIG. 5 is a process drawing of an example in which four medium- and small-sized I-type steels are manufactured by using the large-sized I-girder manufacturing apparatus in the first embodiment of the present invention.

FIG. 6 is a diagram showing an example of a flange restraint member.

FIG. 7 is a view showing an example of manufacturing I-shaped steels of different sizes in the second embodiment of the present invention.

FIG. 8 is a view showing an example of manufacturing I type steel, T type steel, and notched type steel in the third embodiment of the present invention.

[Explanation of symbols]

 1 web material 2 cutting slit 3 flange material 4 restraint jig 5 bolt hole 6 I-shaped steel 7 T-shaped steel 8 notched T-shaped steel 9 notched hole 10 I-figure manufacturing device 11 I-figure automatic production line 15 main welding device 16 reversing machine 17 Straightener 18 Transfer roller 19 Cylinder device

Claims (2)

[Claims] 1. A method for producing welded steel, wherein a large I
Using a slit-cut steel sheet having a partial cutting residue on a cutting line of a large plate of a web material having a width within the manufacturing range of the girder manufacturing apparatus, the I-girder manufacturing apparatus is used to form flanges on both sides of the web material. After the materials are assembled and welded to produce a large I-shaped steel, the flanges of the T-shaped steel pieces obtained by cutting the cutting residue of the web material are bound back-to-back to form an integrated web material. Using a large I-girder manufacturing apparatus, which is characterized by assembling a new flange material at the end of the and welding it with the web material, and then releasing the constraint of the flange material restrained back to back and separating. Method for manufacturing small and medium welded steel. 2. A large plate of web material is provided with a plurality of rows of cutting slits having a width of the web height of the shaped steel to be finally obtained, and the process according to claim 1 is repeated to obtain three or more bodies. A method for producing a medium- or small-sized welding type steel using a large-sized I-girder producing apparatus characterized by producing a small welding type steel.