JPH084948B2 - Box-type structural material manufacturing method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a box-type structural member using a side plate having a plate thickness of 50 mm or more such as a box pillar of a skyscraper.

[0002]

2. Description of the Related Art A box-type structural member has a structure in which a diaphragm is attached by welding inside four side plates having a rectangular cross section in which four corners are square-welded, and various manufacturing methods have been proposed. For example, there are the following manufacturing methods.

The manufacturing method is as shown in FIGS. 13 (a), 13 (b), 13 (c) and 13 (d). Two side plates 1A (hereinafter referred to as webs) having a welding groove and a welding groove. Two side plates 1B without
Columnar space 2 for welding on 4 sides (hereinafter referred to as flange)
The box-shaped structural member is temporarily assembled by temporarily attaching the diaphragm 3 having the above, and the corner welds of the four corners are angularly welded, and then the angular welded portions of the web 1A are perforated to form the columnar space 2 along the inner surface of the flange 1B.
(A), and the columnar space 2 is used for consumable nozzle electroslag welding (referred to as CES welding) (b).
Next, the flange 1B was perforated to make conduction in the columnar space 2 along the inner surface of the web 1A (c) and CES welding (d).

[0004]

In such a conventional welding method, the corner welding of the four corners is performed first, and the CES welding between the side plate and the diaphragm is performed later. However, due to the corner welding, the side plate contracts in the width direction so that the side plate is deformed, and the flange is bent to form a gap between the diaphragm and the flange. There is a drawback that molten metal easily leaks from this portion during CES welding. In addition, following the corner welding step, if a hole that conducts to the columnar space along the inner surface of the flange 1B is bored in the corner welded portion of the web 1A, the machining is performed in the state where the residual heat of the welding is performed. However, there was a problem in that it was difficult to perform good cutting.

As a means for solving such a drawback, after corner welding of the four corners is performed, holes are formed in the flange 1B so as to connect to the columnar spaces along the inner surface of the web 1A, and the web 1A and the diaphragm 3 are formed. CES welded, flange 1B
It is possible to reduce the gap between the diaphragm 3 and the diaphragm 3 to prevent the outflow of molten metal during CES welding, but when an extremely thick side plate with a plate thickness of 50 mm or more is used, the deformation of the flange becomes large, It was difficult to reduce the gap between the flange and the diaphragm by corner welding to prevent the molten metal from flowing out during CES welding.

The present invention has been made in view of the above problems. Its purpose is to reduce the gap between the flange and the diaphragm, prevent the molten metal from flowing out during CES welding, allow the diaphragm to be welded with high accuracy, and perform square welding without defects. It is to propose a method for manufacturing a box-type structural material.

[0007]

A method for manufacturing a box-type structural material according to the present invention is a method for manufacturing a box-type structural material having diaphragms inside four extremely thick side plates having a plate thickness of 50 mm or more. , A temporary mounting box with two grooved side plates (webs) having welding grooves at both ends, two grooveless side plates (flange), and a plurality of diaphragms having welding columnar spaces on four sides With the mold structure material in the assembled state, the four corners of the welding groove are subjected to primary angle welding (first step), and the flange is perforated to be electrically connected to the columnar space along the inner surface of the web (second step). The electro-slag welding of the columnar space thus prepared is performed (third step), the box-shaped structural material is rotated by 90 °, and the web is perforated to be electrically connected to the columnar space along the inner surface of the flange (fourth step). Electro in the columnar space Lug welding is performed (fifth step), the electroslag welding layer of the primary angle welding portion is gouged, the welding groove is adjusted to the primary angle welding layer, and then corner finishing welding is performed on the layer (the first step). Step 6).

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to illustrated embodiments.

In this manufacturing method, the side plates having a plate thickness of 50 mm or more are opposed to two side plates as shown in FIGS.
A rectangular diaphragm 3 having a protrusion 4 at both corners of the side and a columnar space 2 formed between two electroslag welding plates 5 on the sides is used.

As shown in FIG. 3, three side plates 1A and 1B are temporarily attached to the three sides of the diaphragm 3 by tack welding or the like, and then one side plate 1B is further assembled and temporarily attached as shown in FIG. Then, the box type structural material is put into an assembled state. The two facing side plates 1A are webs 1 having welding grooves 6 at both ends.
A, the other two side plates facing each other are composed of a flange 1B having no welding groove.

This structural material is rotated by 90 ° and the welding groove 6
Is used as the upper surface, and the primary corner welding 7 (seal welding) of the web 1A and the flange 1B is performed by MAG welding or submerged arc welding as shown in FIG.

Rotate 90 ° again and make the surface of the flange 1B the upper surface, perforate both side edges of the flange 1B as shown in FIGS. 6 and 7, and provide a through hole 8 for conducting to the columnar space 2 along the inner surface of the web 1A. The web 1A and the diaphragm 3 are electroslag welded 9A using the No. 2 wire.

By rotating again, the surface of the web 1A is made the upper surface, and as shown in FIGS. 8 and 9, the primary corner welding 7 parts of both side edges of the web 1A are perforated, and the conduction holes are formed to the columnar spaces 2 along the inner surface of the flange 1B. 8 is provided and the flange 1B and the diaphragm 3 are electroslag welded 9B using the columnar space 2.
To do. Next, as shown in FIG. 10, the electroslag welding 9B layer of the primary angle welded portion 7 is gouged to adjust the welding groove to the primary angle welding layer, and then the corner finishing welding 11 is applied on the layer as shown in the figure, Manufactures box-type structural materials.

[0014]

FUNCTION AND EFFECT OF THE INVENTION The present invention has the above-mentioned structure. This manufacturing method uses primary angle welding in the first step and does not weld to full size (plate thickness), so side plates with extremely large thickness are used, but side plates shrink during welding in the state of primary angle welding. It is possible to suppress the curved deformation of the flange due to the, and to reduce the gap between the flange and the diaphragm extremely. It is possible to further shrink the gap between the flange and the diaphragm by punching the flange and CES welding the web and the diaphragm in the second and third steps, and in the subsequent CES welding of the flange and the diaphragm in the fourth and fifth steps. It is possible to prevent the molten metal from flowing out. After welding the web and the flange to the diaphragm, the CES welding layer of the primary angle welded portion is caulked, the welding groove is adjusted to the primary angle welding layer, and then the corner finish welding is performed, so that there is no defect in the angle welding. can do. Since the flange surface is pierced first and the primary corner welded portion of the web is pierced in the subsequent step, it is possible to prevent a piercing failure such as a cutting edge of a drill due to residual heat of the primary corner welding.

As described above, according to this manufacturing method, it is possible to efficiently manufacture a box-type structural member using a side plate having an extremely large plate thickness and excellent finishing quality.

[Brief description of drawings]

FIG. 1 is a plan view of a diaphragm.

FIG. 2 is a plan view of a diaphragm to which a welding metal plate is attached.

FIG. 3 is a cross-sectional view of a state in which side plates are temporarily attached to the three sides of the diaphragm.

FIG. 4 is a cross-sectional view of a box-type structural member assembled by temporarily mounting four side plates and a diaphragm.

FIG. 5 is a cross-sectional view in a state where primary angle welding is performed.

FIG. 6 is a cross-sectional view showing a state where a through hole is formed in the flange.

FIG. 7 is a sectional view showing a state in which a web and a diaphragm are CES-welded.

FIG. 8 is a cross-sectional view showing a state in which a conductive hole is formed in the web.

FIG. 9 is a sectional view showing a state in which a flange and a diaphragm are CES-welded.

FIG. 10 is a cross-sectional view of a state in which the CES welding layer of the primary angle welding portion is gouged.

FIG. 11 is a cross-sectional view of a state where the primary corner welded portion is subjected to corner finish welding.

12 is a cross-sectional view taken along the line AA of FIG.

13 (a), (b), (c) and (d) are sectional views showing a conventional manufacturing method in the order of steps.

[Explanation of symbols]

1A ... Side plate with weld groove (web), 1B ... Side plate without weld groove (flange), 2 ... Welding columnar space, 3 ... Diaphragm, 4 ... Projection, 5 ... Weld metal, 6 ... Weld groove , 7 ... Primary angle welding, 8 ... Conductive hole, 9A, 9B ... CES welding, 10
… Gouging, 11… Square finish welding.

Claims (1)

[Claims] 1. A method for manufacturing a box-type structural member having a diaphragm inside four extremely thick side plates having a thickness of 50 mm or more, wherein two side plates with a groove (welding grooves at both ends are provided). Web) and two grooveless side plates (flange)
And, a plurality of diaphragms having columnar spaces for welding on four sides are temporarily attached, and the box-shaped structural material is in an assembled state, and the welding grooves at the four corners are primary angle welded (first step), and there is no groove side plate. The columnar space along the inner surface of the grooved side plate to conduct electricity (second step), and electroslag welding the conducted columnar space is performed (third step).
Rotate by 0 ° to perforate the side plate with a groove to conduct the columnar space along the inner surface of the grooveless side plate (fourth step), and perform electroslag welding of the columnar space that has been conducted (fifth step). ), Gouging the electroslag welding layer of the primary angle welding portion to adjust the welding groove to the primary angle welding layer, and then performing corner finishing welding on the layer (sixth step) Box-type structural material manufacturing method.