JPH0255667A - Production of box-shaped structural material - Google Patents

Abstract

PURPOSE:To obtain the box-shaped structural material with fewer working stages without stagnating the production line by carrying out the operations in the other of assembling to a box shape, 1st slag welding, square welding to weld bevels and 2nd slag welding. CONSTITUTION:A backing strip 2 is continuously and longitudinally mounted to the rear surface of the weld bevels of two sheets of side plates 1 having the weld bevels at both side ends and straps 3 for slag welding are provided to the four corners of diaphragms 5 formed to both corner parts on the opposite two sides thereof. The diaphragms 5 are then assembled of two sheets of the above-mentioned side plates 2 and two sheets of the upper and lower side plates 7 previously bored with communicating holes 6 in the welding positions of every other sheet of the diaphragms 5. The slag welding is thereafter executed simultaneously laterally toward the columnar space 8 formed of the side plates 7 bored with the holes 6 and the straps 3 from the holes 6 of the plates 7. The structural material A made into a box shape is turned over and is similarly subjected to the slag welding; further, the material is rotated 90 deg. and further 180 deg. and is subjected to the square welding of the weld bevel parts. The space 8 is thereafter subjected to the slag welding simultaneously on the right and left for every other sheet of the diaphragms 5, by which the structural material A is obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for manufacturing box-shaped structural members used for columns, beams, etc. of skyscrapers.

[Prior art]

This type of box-shaped structural member has a structure in which a diaphragm is attached to the inside of four side plates by welding, and the following method for manufacturing the same has been generally used.

(2) A method of welding the two sides of the side plate 12 and the diaphragm 13 by a semi-automatic cO2 arc before constructing the box, as shown in FIG.

(2) A method of welding the side trFiI 2 and the diaphragm 13 after the box is assembled as shown in FIGS. 15 and 16.

Here, in the method shown in Figure 15, after temporarily assembling the box pillars,
Weld the groove surface with AW, then finish the end by drilling SES welding (I to B), then turn it over and drill the hole (G,
h), SES and finishing are performed again, and the number of work steps is reduced by 5 steps compared to the method of (i) above.

Furthermore, the method shown in Fig. 16 involves drilling holes in the two side plates during temporary machining as shown in A, and immediately performing SES welding. Two tep are omitted, which reduces the work area and shortens the cycle time.

[Problems to be solved by this invention]

However, in the method described in ■, the production line uses submerged arc welding (SA) after assembly, rather than GO2 semi-automatic welding.
W), which involves different types of work. Therefore, interruption of work cannot be avoided.

That is, in steel structure work, the same work is performed continuously and smoothly, but for example, the accuracy of the assembly work itself, including distortion, or the skill of the worker fluctuates above all else. In addition, COz semi-automatic welding itself may vary depending on the skill of the welder, and it may take up to 24 hours after welding.
After some time has elapsed, an ultrasonic inspection process for the welded area begins. Their location in the middle of the steel structure work causes line congestion and reduces production efficiency. In addition, the number of work steps is large, and a corresponding work space is required.
This inevitably results in an increase in the work process.

In addition, the method described in (2) separates the assembly and welding operations, so it is superior to the method (2).

However, this method still requires a large number of work steps, and
It has the same issues as mentioned above.

This invention was devised in view of the above-mentioned circumstances, and its purpose is to avoid congestion on the production line and reduce production efficiency, reduce the number of work steps, and reduce the number of work locations and work requirements. An object of the present invention is to provide a method for manufacturing a box-shaped structural material that allows for the following.

[Means to solve the problem]

According to the method of the present invention, first, backing materials are attached continuously in the longitudinal direction to the back surfaces of the weld grooves of the two side plates 1 that have weld grooves at both ends, and at both corners of the two opposing sides. Slag welding pads are provided on the four sides of the diaphragm, which has protrusions formed on the diaphragm.

Next, the two side plates having the welding grooves and the upper and lower two side plates having communication holes for slag welding pre-drilled at every other welding position of the diaphragm are assembled to surround the diaphragm.

After that, first, a side plate of the drilling method of the communication hole for slag welding,
Aiming at the columnar space formed by the slag welding pad, slag welding is performed simultaneously on the left and right sides through the slag welding communication hole in the upper plate.

Next, this box-shaped structural member is reversed, and slag welding is again performed simultaneously on the left and right sides from the slag welding communication hole in the lower plate to the other columnar space left.

Thereafter, this box column is rotated 906 times to perform corner welding on the welding groove, and is further reversed to perform corner welding on the other remaining welding groove.

Then, use a drill to drill a hole in the two side plates having the welding groove so that the columnar space between the side plates having the welding groove on the remaining two sides that intersects with the slag welding portion passes through the upper and lower sides. In this columnar space, slag welding is performed simultaneously on the left and right sides of every other diaphragm.

As a result, the number of work processes can be reduced, the work area can be reduced, and production processes can be eliminated.

〔Example〕

The present invention will be explained below with reference to illustrated embodiments.

As shown in FIGS. 1 to 11, a box-shaped structural member having a plurality of diaphragms inside is manufactured in the following order.

(2) As shown in FIG. 2, a backing material 2 is attached continuously in the longitudinal direction to the back surfaces of the weld grooves of the two side plates 1.1 having weld grooves at both ends. Further, as shown in FIG. 1, slag welding pads 3 are provided on the four sides of the diaphragm 5, which has protrusions 4, 4 formed at both corners of two opposing sides.

■ As shown in FIGS. 3 and 4, the two side plates 1, 1 having the welding grooves, and the upper and lower portions with communication holes 6 for slag welding pre-drilled at the welding positions of every other diaphragm 5. The diaphragm 5 is assembled into a box shape by surrounding the diaphragm 5 with the two side plates 7, 7.

At this time, the communication holes 6 for slag welding between the upper side plate 7 and the lower side plate 7 are alternated.

■ After that, first aim at the columnar space 8 formed by the side plate 1.1 having a welding groove and the slag welding pad 3, and
As shown in the figure, slag welding is performed simultaneously on the left and right sides through the slag welding communication holes 6 of the upper plate 7.

In addition, here, the reference numeral 9 indicates 1, which is provided to prevent molten metal from burning through during slag welding because the welding groove is unwelded.
It is the same amount.

This slag welding operation from the upper plate 7 is performed on every other diaphragm 5 because the slag welding communication holes 6 are alternated between the upper plate 7 and the lower plate 7. (See Figure 4) ■ Next, turn this box-shaped structural member 9 over and weld it again in the same way as in the previous ■ slag welding on the left and right sides at the same time. (See Figure 6) ■ After that, this box-shaped structural member 9 is rotated 90 degrees as shown in Figures 7 and 8, and corner welding is performed at the weld groove. Turn over and perform corner welding on the remaining weld groove.

■Next, the columnar space 10 between the side plate 7 having the weld grooves on the remaining two sides that intersects with the slag welded part made as described above penetrates vertically as shown in FIG.
A drill (not shown) is used to drill holes in the two side plates 1.1 having weld grooves. Welding defect 1 in the columnar space 8 that occurred at the start when the columnar space 8 was slag welded at this time
1' is removed during drilling. (See Fig. 12) Then, this columnar space 10 is made in the same manner as in the above (■),
As shown in FIG. 10, slag welding is performed simultaneously on the left and right sides of every other diaphragm 5. At this time, as shown in FIG. 13, since the start time of slag welding is within the start tab, no defect is generated within the columnar space 10.

In the above explanation, the slag welding work is performed simultaneously from the welding communication holes drilled alternately (on every other sheet) in the upper and lower plates, but the slag welding work is performed in the opposite direction alternately in the upper and lower plates of the same diaphragm. If the communicating holes are drilled from both directions, slag welding can be performed simultaneously in a staggered manner.

■ After that, if you perform distortion removal, finishing, non-destructive testing, etc.
A box-shaped structural material A is obtained. (See Figure 11) [Effects of the Invention] The method for manufacturing a box-shaped structural member of the present invention includes the following steps: assembly into a box shape, first slag welding, corner welding to the weld groove, and second slag welding. It will be held in

Therefore, there is no need to perform different types of assembly work during welding work as in the past, and the assembly work is performed first, so you can concentrate on welding work and perform it continuously.
The welding process can be simplified, and the manufacturing and construction work of box-shaped structural materials can be carried out efficiently and in a short time.

Furthermore, when performing corner welding on a welding groove, slag welding is performed perpendicular to the welding groove, making it easy to weld with the tip of the groove restrained.

Furthermore, even if there is a slight welding defect in the columnar space during the second slag welding, this part will be drilled for the second slag welding (perpendicular to the previous slag welding). There is no problem as it will be removed.

For these reasons, according to the present invention, the number of work steps is reduced, contributing to a reduction in work area and production steps, and a box-shaped structural material of good quality can be provided at a low cost.

[Brief explanation of the drawing]

Figures 1 to 11 are process diagrams showing the manufacturing process of a box-shaped structural material using the method of the present invention, Figures 12 and 13 are partial sectional views showing the state at the start of slag welding, and Figures 14 to 11 FIG. 16 is a process diagram showing a conventional manufacturing method. ■...Side plate, 2...Backing material, 3...Slag welding pad, 4...Protrusion, 5...Diaphragm, 6...
Slag welding communication hole, 7... Side plate, 8... Column space, 9... Copper pad, 10... Column space, 11... Welding defect, 12... Side plate, 13...・Diaphragm,
14...Start tab, 15...End tab, A.
...Box type structural material. No. = No. 2 and 6 Fig. Fig. Fig. Fig.

Claims (1)

[Scope of Claim] A method for manufacturing a box-shaped structural material having a diaphragm inside four side plates, the method comprising: forming a weld groove on the back side of two side plates 1 having weld grooves at both ends in the longitudinal direction thereof; At the same time as attaching the backing material continuously to
Slag welding pads are provided on the four sides of the diaphragm with protrusions formed at both corners of the two opposing sides, and are pre-welded at the welding positions of the two side plates having the weld grooves and every other diaphragm. Assemble the two upper and lower side plates with the slag welding communication hole drilled around the diaphragm, and first aim at the columnar space formed by the slag welding pad and the side plate with the slag welding communication hole drilled. Then, slag welding was performed simultaneously on the left and right sides through the slag welding holes in the upper plate, and then this box-shaped structural member was turned over and welded from the slag welding holes in the lower plate to the other remaining columnar space. Slag welding is performed simultaneously on the left and right sides again, and then this box column is rotated 90 degrees to perform corner welding on the welding groove, and then this is reversed and corner welding is performed on the other remaining welding groove. Then, use a drill to drill a hole in the two side plates having the welding groove so that the columnar space between the side plates having the welding groove on the remaining two sides that intersects with the slag welding portion passes through the upper and lower sides. A method for producing a box-shaped structural material, characterized in that slag welding is performed simultaneously on the left and right sides of every other diaphragm in this columnar space.