JPH04300080A - Forming method for inner diaphragm of square shape steel tube member - Google Patents

Abstract

PURPOSE:To offer the method for forming an integrated inner diaphragm in the inside of a square shape steel tube member formed by welding a pair of channel steel, and to improve the stress transfer performance of the inner diaphragm part. CONSTITUTION:Half inner diaphragms 3a, 3b are welded 4 in advance to the inside of channel steel 1a, 1b. To the upper and the lower tip parts of the inner diaphragms 3a, 3b, a backing material 8 is attached in advance in a shape extend-over them. By welding 5 each flange tip of the channel steel 1a, 1b, a square shape steel tube member 1 is formed. Thereafter, the part inserted and held by the backing materials 8 is subjected to CES welding 9 from a hole 6 provided on a weld line of the channel steel 1a, 1b, a gap between the half diaphragms 3a, 3b is filled up, and in the inside of the square shape steel tube member 1, an integrated diaphragm 3 is formed.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] The present invention relates to a method for forming an inner diaphragm of a square steel pipe member using consumable nozzle electroslag welding (hereinafter referred to as CES welding), such as a column-beam joint of a square steel pipe column or a square steel pipe. Used for reinforcing truss joints, etc.

0002

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

FIGS. 4 and 5 show typical examples of diaphragms of square steel pipe columns.

The one shown in FIG. 4 is called the outer diaphragm type, and is a method in which a ring-shaped rib (outer diaphragm 10) is welded to the outside of the steel pipe as the square steel pipe member 1 to reinforce it. This method has drawbacks such as the difficulty of cutting the ribs, the difficulty in absorbing dimensional errors between the steel pipe and the ribs, and the fact that the ribs get in the way of mounting on the outside wall.

FIG. 5 shows what is called a sandwich plate type or beam through type, in which a column made of square steel pipe member 1 is cut at the flange position of H-shaped steel beam 2 at the column-beam joint, and a reinforcing plate (outer diaphragm 10' ) is butt welded to form a pillar. This method has drawbacks such as the need for a large number of weld lines and the inability to increase the column thickness due to problems of welding thermal stress and thermal strain.

The one shown in FIG. 6 was developed to compensate for the drawbacks of the above two types, and is called the slit diaphragm type. In this type, inner diaphragms 3a and 3b are respectively split in half at predetermined positions in the state of channel steel 1a and 1b.
After welding, the flange tips of both channel steels 1a and 1b are welded together to form a square steel pipe member 1. However, since there is a gap (slit portion 12) in the center and the inner diaphragm 3 is not integrated, stress transmission from the beam is insufficient, and it cannot be used in areas where beams with large cross sections are attached.

[0007]

As with the slit diaphragm type, the present invention uses an inner diaphragm type in which the diaphragm is formed inside a rectangular cross-section member in order to solve the disadvantages of the outer diaphragm type and the sandwich plate type. In addition, the inner diaphragm is integrated inside a rectangular steel pipe member made by welding a pair of channel steel to solve the problem of stress transmission performance of the slit diaphragm type due to the creation of a slit in the center of the diaphragm. The present invention provides a method for forming a .

[0008]

[Means for Solving the Problems] An overview of the present invention will be explained below using reference numerals in the drawings corresponding to the embodiments.

The square steel pipe member 1 according to the present invention has a square section by making a pair of channel steels 1a and 1b face each other and welding the flange tips together (welded part 5). In this step, the half-split diaphragms 3a and 3b are attached to predetermined positions inside the channel steels 1a and 1b, respectively, and then the channel steels 1a and 1b are welded together, which is the same as in the case of the slit diaphragm type described above. .

In the present invention, after the channel steels 1a and 1b are welded, the gap between the half-split diaphragms 3a and 3b is CES-welded to integrate the diaphragms 3. CES
In order to weld, a backing material 8 is attached in advance to the gap portion when welding the channel steels 1a and 1b together. Further, by providing a hole 6 on the weld line between the channel steels 1a and 1b, CES welding can be performed through this hole 6.

[0011] Note that the channel steels 1a and 1b herein are not limited to commercially available channel steels manufactured by pressing or rolling, etc., but refer to general steel materials with a substantially channel-shaped cross section, including those produced by welding and assembly. .

0012

[Embodiment] Next, the illustrated embodiment will be explained.

FIG. 1 shows an outline of the inner diaphragm forming method of the present invention, in which a pair of channel steels 1a and 1b are welded (welded portion 4) with half-split diaphragms 3a and 3b, respectively, at positions facing each other on their inner surfaces. The tips of the flanges are welded together (welded portion 5) to form a square steel pipe member 1. Thereafter, the gap between the half diaphragms 3a and 3b is CES welded to form an integral inner diaphragm 3.

In the figure, reference numeral 8 denotes a backing material for CES welding, which is attached so as to straddle the upper and lower halves of the diaphragms 3a and 3b. In the figure, 9 is the CES welding part, and C
ES welding is performed through a hole 6 provided on the weld line of the weld portion 5.

In order to enable CES welding, it is important whether the backing material 8 for preventing the flow of weld metal can be attached to both half diaphragms 3a, 3b with sufficient accuracy.

FIG. 2 shows how two backing materials 8a, 8b sandwiching the gap between the half diaphragms 3a, 3b are attached to the half diaphragms 3a, 3b on different sides, respectively.

When joining the channel steels 1a and 1b, the backing material 8
If a and 8b are moved away from the half diaphragms 3a and 3b on the opposite side, and then moved in the direction where they come into close contact, the backing materials 8a and 8b and the half diaphragms 3a and 3b are easily brought into close contact. be able to. Note that even if the half diaphragms 3a, 3b and the backing materials 8a, 8b are separated by about 3 mm, there is no problem because the role of preventing the weld metal from flowing is sufficiently fulfilled.

FIG. 3 shows that two backing materials 8 are placed on each of the half diaphragms 3a, 3b to sandwich the respective half diaphragms 3a, 3b.
Both half diaphragms 3a, 3 are separated in the gap between 3b.
This figure shows how the backing materials 8 of FIG. 1B are attached so that their tips are close to each other.

In this case as well, even if the backing material 8 does not adhere completely, a certain amount of gap is allowed. The allowable value of the gap to sufficiently prevent the flow of welded metal is approximately 1/2 of the thickness of the backing material 8. The backing material 8 is a half-split diaphragm 3a
, 3b are attached after welding, it is relatively easy to manage the gap between the tips, and this level of tolerance is sufficient. The deviation in the plate thickness direction between the opposing backing materials 8 is as follows:
Although it is determined by the welding accuracy of the half diaphragms 3a and 3b, there is no problem with respect to the allowable value as it can be sufficient to prevent weld metal from flowing even if it deviates by about 1/2 of the thickness of the backing material 8.

[0020]

[Effects of the invention]■ Because it is an inner diaphragm type,
Unlike the external diaphragm type, there is no risk of the diaphragm getting in the way of mounting on an external wall.

[0021] Unlike the sandwich plate type, there is no need to cut the column at each diaphragm position, and there are fewer problems with welding.

[0022] Since the inner diaphragm is integrated by CES welding, stress transmission from the beam becomes smooth, and it can also be used in areas where beams with large cross sections are attached.

[0023] CES welding itself is an established technology, and by using holes etc. provided on the weld lines of channel steel, it is possible to integrate the inner diaphragm after forming the square steel pipe member.

[Brief explanation of the drawing]

FIG. 1 shows an overview of the inner diaphragm forming method of the present invention, in which (a) is a horizontal sectional view and (b) is an elevational view.

[Fig. 2] C showing an example of how to attach the backing material
FIG. 3 is a vertical cross-sectional view of an ES welded portion.

FIG. 3 is a vertical sectional view of a CES welded portion showing another example of how to attach a backing material.

FIG. 4 shows an example of a conventional outer diaphragm type in a square steel pipe column, where (a) is an elevation view and (b) is a plan view.

FIG. 5 is an elevational view showing an example of a conventional sandwich plate type for a square steel pipe column.

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

[Explanation of symbols]

1... Square steel pipe member, 1a, 1b... Channel steel, 2... H-shaped steel beam, 3... Inner diaphragm, 3a, 3b... Half inner diaphragm, 4... Welded part, 5... Welded part, 6... For CES welding hole, 7... Spot welded part, 8... Backing material, 9... CES welded part, 10
, 10'...outer diaphragm, 11...scallop, 12...
Slit part

Claims (4)

[Claims] 1. A method for forming an inner diaphragm of a square steel pipe member with a square cross section by welding the flange tips of a pair of channel steels together, the method comprising: pre-splitting each of the pair of channel steels in half at opposing positions on the inner surfaces thereof; The diaphragms are welded, and with the half-split diaphragms attached, the channel steel pieces are welded together to form a square steel pipe member, and then the gap between the half-split diaphragms is welded by consumable nozzle electroslag welding. A method for forming an inner diaphragm of a square steel pipe member, the method comprising forming an integral inner diaphragm. 2. The method for forming an inner diaphragm of a square steel pipe member according to claim 1, wherein two backing materials sandwiching the gap between the half diaphragms are attached to different half diaphragms. 3. Each of the half diaphragms has two
The rectangular shape according to claim 1, wherein two pieces of backing material are attached to sandwich each half diaphragm, and the backing materials of both half diaphragms are adjacent to each other in the gap between the half diaphragms. A method for forming an inner diaphragm of a steel pipe member. 4. The method for forming an inner diaphragm of a rectangular steel pipe member according to claim 1, wherein the consumable nozzle electroslag welding is performed through holes provided on the weld lines of the channel steels.