JP3246285B2 - Method of forming inner diaphragm of rectangular steel pipe member - 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 for forming an inner diaphragm of a closed section member using electroslag welding, in particular, a rectangular steel pipe member, for example, a column-beam joint of a square steel pipe column or a node of a square steel pipe truss. Used for reinforcement.

[0002]

2. Description of the Related Art Generally, in a column having a rectangular cross section, a diaphragm is attached to a beam flange position in order to transmit stress of an H-shaped steel beam to the column.

FIGS. 4 and 5 show a typical example of a diaphragm of a square steel tubular column.

[0004] Fig. 4 shows a so-called outer diaphragm type in which a ring-shaped rib (outer diaphragm 13) is welded to the outside of a steel pipe as the square steel pipe member 1 to reinforce it. This method has disadvantages in that it is troublesome to remove the ribs, it is difficult to absorb a dimensional error between the steel pipe and the ribs, and the ribs hinder the outer wall mounting.

FIG. 5 shows what is called a sandwiching plate type or a beam passing type. In a column-beam joint, a column made of a rectangular steel pipe member 1 is cut at a flange position of an H-shaped steel beam 2, and a reinforcing plate (outer diaphragm 13 ') is cut. ) Is a method of butt welding 15 to form a pillar. This method has problems such as an increase in the number of welding lines, welding thermal stress and thermal distortion.

FIG. 6 has been developed to compensate for the disadvantages of the above two types, and is called a slit diaphragm type. In this type, half inner diaphragms 3a, 3b are respectively provided inside predetermined positions in the state of channel steels 1a, 1b.
After welding 4 b, the square steel pipe member 1 is obtained.

However, since a gap (slit portion 16) is formed at the center and the inner diaphragm 3 is not integrated, stress transmission from the beam is insufficient, and it cannot be used in a portion where a beam having a large cross section is attached.

[0008]

As a supplement to the above-mentioned disadvantages of the slit diaphragm type, Japanese Patent Application Laid-Open No. 61-1 / 1986 has been proposed.
Japanese Patent Application Publication No. 22359 discloses a method of forming an inner diaphragm in which half inner diaphragms 3a and 3b are integrated by electric resistance welding as shown in FIG.
No. 00080 discloses a method of forming an inner diaphragm in which half inner diaphragms 3a and 3b are integrated by electroslag welding as shown in FIGS. 8 (a) and 8 (b).

However, in this case, there is a problem that the distance from the wall surface of the steel pipe to the central welded portion is large, and it is difficult to detect welding defects by ultrasonic flaw detection after the completion of the steel pipe member.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for forming an inner diaphragm of a rectangular steel pipe member which is smooth in stress transmission and easy to detect a welding defect by ultrasonic flaw detection from the outer surface of the steel pipe, and has high reliability. It was done.

[0011]

An outline of the present invention will be described below with reference to the accompanying drawings.

According to a first aspect of the present invention, there is provided a method of forming an inner diaphragm of a rectangular steel pipe member, in which a pair of channel steels 1a and 1b are welded to each other at their flange ends to form a square cross section. In this case, the inner diaphragm 3 made of a single plate is used.

For mounting the inner diaphragm 3, backing materials are disposed on the front and back of the outer periphery of the inner diaphragm 3, and the outer peripheral surface of the inner diaphragm 3, the backing material on the front and back, and the inner surfaces of the channel steels 1a and 1b. The welding holes 6a and 6b, which are the gaps surrounded by the circles, are formed by electroslag welding over the entire circumference, and the inner diaphragm 3 is fixed to the inside of the rectangular steel pipe member 1 in this manner.

In the present invention, at this time, the inner diaphragm 3
Is temporarily fixed to the inner surface of one channel steel 1a in advance via the backing material 7a on the front and back, and the backing material 7b on the front and back can be inserted into the other channel steel 1b at the end of the inner diaphragm 3. The welding holes 6a, 6b are formed by combining the channel steels 1a, 1b in that state, and the channel steels 1a, 1b are formed.
1b welding between the flange tips and welding holes 6
Electroslag welding of a and 6b is performed.

Further, in the present invention, the backing member 7b (the other channel steel) into which the opposite end of the inner diaphragm 3 temporarily fixed to the inner surface of one channel steel 1a via the backing material 7a is inserted. 1b side), a heat-expandable refractory material 8 is arranged in advance in the vicinity of a gap generated in a portion where the heat-expandable refractory material 8 expanded by heat of electroslag welding closes the gap. Prevents molten metal from flowing out of parts 6a and 6b
You.

The channel steels 1a and 1b mentioned here are not limited to commercially available channel steels manufactured by pressing or rolling, but generally include steel materials having a substantially channel-shaped cross-section including welding assembly. .

According to the present invention, the single inner diaphragm 3 is used as described above, and the inner diaphragm 3 is electroslag welded to the channel steels 1a and 1b forming the square steel pipe member 1 over the outer peripheral portion of the inner diaphragm 3. Then, the electroslag welded portion is fixed to the inner surface of the rectangular steel pipe member 1, and the presence or absence of a welding defect can be confirmed by ultrasonic flaw detection from the outer surface of the steel pipe after the completion of the rectangular steel pipe member 1.

However, by combining the channel steels 1a and 1b, an unavoidable gap is produced between the inner diaphragm 3 and the inner surface of the backing material 7b attached to the other channel steel 1b in the production. When slag welding is performed, there is a possibility that molten metal flows out from the welding hole 6b.

Normally, four to six inner diaphragms 3 need to be incorporated into one square steel pipe member 1 at the same time, and all the backing members 7b and the inner diaphragm 3 are connected to each other so that molten metal does not leak. Controlling the dimensional accuracy of the work significantly reduces the work efficiency.

[0020] In the present gun onset Ming, in the vicinity of this gap, it should be placed in thermal expansion fireproof material 8 previously, by expanding this the heat input of the electro-slag welding, the backing material 7b and the inner diaphragm 3 Can be closed, and outflow of molten metal can be prevented. Therefore, the dimensional accuracy of the connection required for the backing material 7b and the inner diaphragm 3 can be greatly reduced.

[0021]

FIG. 1 shows an embodiment of a method for forming an inner diaphragm according to the present invention, in which (a) shows a method for attaching a backing material and an inner diaphragm to a channel steel, and (b) shows a method for mounting the inner diaphragm. A state in which the rectangular steel pipe member is laid down for performing electroslag welding, and FIG.

As the inner diaphragm 3, a single plate is used.
a is attached by fillet welding 4a, and this is attached to one channel steel 1a.
Temporarily with a fillet weld 4b.

On the other channel steel 1b, front and back backing members 7b are arranged at intervals so as to leave a gap in which the inner diaphragm 3 can be inserted, and attached by fillet welding 4b.

In the illustrated example, the backing material 7b
The notch 11 is provided on the inner surface (all three sides) of the tip of the.

The channel steel 1b is assembled so that the flange tips are brought into contact with each other, and the flange tips of the channel steels 1a and 1b are joined together by welding 5 to form the square steel pipe member 1.

In the vicinity of the joint between the backing material 7b and the inner diaphragm 3, a heat-expandable refractory material 8 is previously applied (in the case of a paint type or a caulking type) and arranged.

Next, on the welding line of the electroslag welding, the upper side opening 9a drilled in the channel steels 1a, 1b.
(A top surface in the arrangement shown in the figure), a welding wire is inserted from the start tab 10 provided immediately below the bottom opening 9b.
From above, the gaps (welding holes 6a, 6b) surrounded by the inner diaphragm 3, the backing members 7a, 7b and the inner surfaces of the channel steels 1a, 1b are filled with molten metal.

At this time, the heat of the electroslag welding causes the heat-expandable refractory material 8 to expand, thereby closing a gap (indicated by e in the figure) created between the backing material 7b and the inner diaphragm 3 and melting. Prevent spillage of metal.

The damping projection 3a of the inner diaphragm 3 is provided with a welding hole 6 for electroslag welding in a horizontal direction.
The molten metal is prevented from flowing out to the b.

When the vertical electroslag welding is completed, the square steel pipe member 1 is rotated by 90 °, and a new opening is formed in the upper and lower ends (the upper and lower ends in a state rotated by 90 °) for inserting a welding wire. Then, electroslag welding is performed in the same procedure.

The notch 11 provided on the inner surface of the front end of the backing member 7b on the side where the inner diaphragm 3 is inserted is provided between the front and back backing members 7b when the steel pipe member is assembled. This is to prevent the inner diaphragm 3 from interfering with the thermally expandable refractory material 8 arranged beforehand and shaving it off.

Also, the width h of the backing material 7b attached to the channel steel 1b to the inner side of the channel steel 1b is made sufficiently large,
By lengthening the outflow path of the molten metal, the temperature of the molten metal is reduced, and the molten metal is solidified in the gap e, so that the outflow of the molten metal from the welding hole 6b can be prevented.

FIGS. 2 and 3 show variations in the arrangement of the thermally expandable refractory material 8. FIG.

In the example of FIG. 1, the thermally expandable refractory material 8 is arranged in the notch 11 of the backing material 7b, whereas in the embodiment of FIG. It is arranged at a position facing the notch 11. In addition, in the embodiment of FIG. 3, the shape of the notch 11 is a triangular cross section with respect to the rectangular cross section of FIG.

The heat-expandable refractory material 8 includes a paint type,
Any of a coating type such as a caulking type (semi-milling type), a tape-shaped or plate-shaped and pasted type, and the like may be used.

When the thickness of the heat-expandable refractory material 8 is very small and there is no fear that the inner diaphragm 3 will be cut off even if it interferes with the heat-expandable refractory material 8 when assembling the rectangular steel pipe member, The notch of the backing material 7b can be omitted.

[0037]

[Effects of the Invention] Since the present invention is of the inner diaphragm type, there is no possibility that the diaphragm interferes with the attachment of the outer wall or the like unlike the outer diaphragm type.

Unlike the sandwich plate type, it is not necessary to cut the rectangular steel pipe member at each diaphragm position, and there are few problems related to welding.

Since the inner diaphragm is integrated by electroslag welding, stress transmission from the beam to the column or the truss member becomes smooth, and it can also be used for a beam or truss member having a large cross section.

It is possible to easily detect a welding defect by ultrasonic inspection from the outer surface of the steel pipe, and to provide a highly reliable inner diaphragm.

Arranged in the vicinity of the gap generated in the joint
With the placed thermal expansion refractory material, it is possible to easily, inexpensively and reliably prevent the molten metal from flowing out of the welding hole during electroslag welding, and the required dimensional accuracy of member assembly is greatly eased, Work efficiency is improved.

[Brief description of the drawings]

FIG. 1 shows an embodiment of a method for forming an inner diaphragm according to the present invention, in which (a) is a vertical sectional view showing an assembling state of a rectangular steel pipe member, and (b) is a posture in an electroslag welding position. FIG. 4C is a vertical sectional view, and FIG.

FIG. 2 is a cross-sectional view of an electroslag welding portion showing an example of an arrangement position of a thermally expandable refractory material.

FIG. 3 is a cross-sectional view of an electroslag welded portion showing another example of an arrangement position of a thermally expandable refractory material.

FIGS. 4A and 4B show examples of a conventional outer diaphragm type in a square steel tubular column, wherein FIG. 4A is an elevation view and FIG. 4B is a plan view.

FIG. 5 is an elevation view showing an example of a conventional sandwich plate type in a square steel tubular column.

FIG. 6 is a plan view showing an example of a conventional slit diaphragm type.

FIG. 7 is a cross-sectional view showing an example of a conventional type in which a central portion of a half diaphragm is welded by electric resistance welding.

FIG. 8 shows an example of a conventional type in which a center portion of a half diaphragm is welded by electroslag welding.
(a) is a horizontal sectional view in the state of standing upright as a pillar, and (b) is a front view.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Square steel pipe member, 1a, 1b ... Channel steel, 2 ... H-shaped steel beam, 3 ... Inner diaphragm, 3a, 3b ... Half inner diaphragm, 4a, 4b ... Fillet welding, 5 ... Welding, 6, 6a ,
6b: welding hole, 7: backing material, 8: heat-expandable refractory material, 9
a: upper opening, 9b: lower opening, 10: start tab, 11: notch, 13, 13 ': outer diaphragm, 14: scallop, 15: butt welding, 16: slit, 17: electrode , 18 ... electric insulation

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Akio Otake 4-5-33 Kitahama, Chuo-ku, Osaka City Inside Sumitomo Metal Industries, Ltd. (56) References Tokiko Tokiko 1-28676 (JP, B2) Tokiko Tokiko 52-46171 (JP, B2) JP-B-58-954 (JP, B1) (58) Fields investigated (Int. Cl. ⁷ , DB name) B23K 25/00 E04B 1/24 E04B 1/58 E04C 3 / 32

Claims (1)

(57) [Claims] 1. A method for forming an inner diaphragm of a rectangular steel pipe member having a rectangular cross section by welding the tips of flanges of a pair of channel steels, wherein a backing material is provided on the front and back of the outer peripheral portion of the inner diaphragm made of a single plate. Is arranged, and the outer peripheral surface of the inner diaphragm and the backing material on the front and back and the inner peripheral surface of the channel steel are welded by electroslag welding over the entire circumference, which is a gap surrounded by the inner diaphragm. In fixing to the inside of the rectangular steel pipe member, the inner diaphragm is temporarily fixed to the inner surface of one channel steel in advance via a backing material, and the other channel steel is previously fixed to the inner surface of the channel steel. The material is temporarily fixed at an interval at which the end of the inner diaphragm can be inserted, and in this state, the weld hole is formed by combining the channel steels with each other, and the other hole is formed .
A backing material temporarily fixed to the inner surface of the channel steel, and the inner diaphragm
Thermal expansion near the gap created at the joint with the end
A refractory material is placed in advance for electroslag welding.
In addition, the expansion of the heat-expandable refractory material causes melting from the welding hole.
A method for forming an inner diaphragm of a rectangular steel pipe member, characterized by preventing molten metal from flowing out .