JPH09239592A - Method for joining beam with column - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the development of crack caused by concn. of stress to a lower flange of a metallic beam by sufficiently welding near the crossing part of the lower flange and a web at the end surface of the metallic beam to a column. SOLUTION: At the lower flange 22 side on the end surface of the web 24 of the steel frame beam 2, an oblong notching part 25 is beforehand arranged along the web end surface and a crossing part space 4 formed between the crossing part 26 of the lower flange 22 in the steel frame beam 2 and the web 24, and the column, is surrounded with a mold frame block 5. An enclosed welding is executed between the crossing part 26 and the column by inserting a welding rod into the crossing part space 4 through the notching part 25, and after removing the mold frame block 5, a groove welding is executed between the lower frame 22 and the column, in the flange part space 6 formed between the lower flange 22 and the column.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of joining a beam to a column, and more particularly to a method of welding a lower flange of a steel frame beam to the column.

[0002]

2. Description of the Related Art As a conventional method for welding the lower flange of a metal beam to a column, there is a method shown in FIG. In the figure, A is a column made of H-shaped steel, and this column A has a flange A1 (the other flange is not shown) and a web A.
2 and a reinforcing plate A3 which is interposed in a recess surrounded by both flanges and the web to reinforce the pillar A. A back metal B is projected on the pillar A, and a beam C made of H-shaped steel is arranged on the back metal B. The beam C is temporarily fixed to a joint metal piece (not shown) welded to the column A using a bolt nut, and includes a lower flange C1, a web C2, and an upper flange (not shown). In the portion, a scallop D is formed on the upper side of the lower flange C1 of the web C2, and a groove E is formed at the end of the lower flange C1.

The beam C is welded between the groove E of the lower flange C1 of the beam C and the column 1 while being temporarily fixed to the column A at the illustrated position. This welding is performed while moving the tip of the welding rod in the width direction of the web C2, but the welding near the intersection of the lower flange C1 and the web C2 is performed by inserting the welding rod through the scallop D. Reference symbol F in the figure
Indicates weld metal.

[0004]

However, according to the above-mentioned conventional method, the welding in the vicinity of the intersection of the lower flange C1 and the web C2 is performed by inserting the welding rod through the scallop D. The operation is significantly limited by the scallop D, and as a result, the welding near the intersection of the lower flange C1 and the web C2 tends to be incomplete.

Further, FIG. 9 shows a state in which the welding is completed, but since the scallop D remains as a void as it is, stress is likely to be concentrated on the lower flange C1 on the lower side of the scallop D, and during an earthquake or the like. There is also a drawback that a crack G easily occurs here due to the repeated load of.

Therefore, an object of the present invention is to sufficiently weld the vicinity of the intersection of the lower flange and the web on the end surface of the metal beam to the column, and the object of the present invention is to provide a lower flange for the metal beam. , To prevent the occurrence of cracks due to stress concentration.

[0007]

According to the method of joining a beam to a column of the present invention, a longitudinally elongated notch along the end face of the web is provided in advance on the lower flange side of the end face of the steel beam. The steel beam is temporarily fixed between the columns, and the lower flange of the steel beam and the intersection space formed between the intersection of the web and the column are surrounded by a form block. Next, a welding rod is inserted into the space of the intersection through the notch to weld between the intersection and the column. After demolding the mold block, the lower flange and the column are welded in a flange portion space formed between the lower flange and the column.

The lower flange of the steel beam and the intersection of the web,
Since the intersection space between the pillar and the pillar is surrounded by a form block in advance and the welding is performed in the space, the welding in the intersection space is an enclosed welding. A groove may be formed on the end surface of the lower flange, and in this case, the welding in the space of the flange portion formed between the lower flange and the column is "re" type groove welding.

The welding in the intersection space can be performed by passing a welding rod through a vertically long notch on the end face of the web of the beam. Since the notch is vertically long, the welding rod can be brought close to vertical. Therefore, the tip of the welding rod can be moved to every corner of the intersection space, and welding work can be performed efficiently. In addition, since this welding is enclosed welding, incomplete welding is unlikely to occur, and therefore, welding with extremely few defects can be achieved.

As the mold block, ceramics,
It is possible to use one composed of either flux or cement, but in the case of ceramics, the form block can be diverted and repeatedly used, and in the case of flux, Since it is formed by solidifying a powdery flux with a solidifying agent, it is suitable for curing and protecting the weld metal during welding, and facilitates removal of the form block after hardening of the weld metal, and further the flange portion Excellent adhesion to weld metal in space. Further, when the form block is made of cement, it can be obtained at low cost.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention is to join a steel beam 2 to a steel column 1 as shown in FIG.
In this embodiment, it is made of H-shaped steel, and its both flanges 11
A reinforcing plate 13 is welded to the concave portion surrounded by the web 12 and the web 12. A well-known steel pipe column can be used as the steel frame column 1. The steel beam 2 is also made of H-shaped steel, a groove 23 is formed in the upper flange 21 and the lower flange 22, and a vertically long notch is formed along the end face of the web 24 and below the end face to the lower flange 22. The part 25 is formed. The end face of the web 24 of the cutout portion 25 is continuous with the upper end of the groove 23 of the lower flange 22.
No scallop is formed on the lower flange 22 side at the end. Therefore, the method of joining the steel beam 2 to the steel column 1 of the present invention is one of the non-scallop construction methods.

The non-scallop method is usually used in factory welding, and in some cases the non-scallop method is also used in field welding.
It is used as a method of welding the upper flange 21 of the steel beam 2 to the column 1.

However, the present invention is characterized in that the non-scalloping method is used for welding the lower flange 22 of the steel beam 2, and for applying the non-scalloping method to the lower flange 22, the notch on the end face of the web 24 is used. An original method of forming the portion 25 is adopted.

By the way, the steel beam 2 has upper and lower flanges 21, 2 on backing plates 31, 32 projecting from the outer surface of the steel column 1.
2 Temporarily fixed to the steel column 1 with the tip mounted. The backing metal 31 is provided on both sides of the web 24 below the upper flange 21 so as not to interfere with the web 24 of the steel beam 2.
Although they are individually arranged with a thickness dimension of 4,
Conversely, the web 24 may be provided with a notch to avoid the interference. The temporary fixing is performed by bolting the web 24 of the steel beam 2 to the joint plate 33 welded to the steel column 1 and welding between the backing plate 32 and the lower surface of the lower flange 22.

FIG. 2 is an enlarged view of a main part of FIG. 1, and clearly shows a root gap 32a formed between the lowermost end of the groove of the lower flange 22 and the steel column 1, and FIG. 1-
FIG. 4 is an enlarged cross-sectional view of a line, and in FIG. 3, an intersection portion 26 of the lower flange 22 and the web 24 particularly on the end surface of the steel beam 2 is shown. The intersection space 4 formed between the intersection 26 and the steel column 1 is surrounded by the form block 5 as shown in FIGS. 4 to 6, and the groove 23 of the lower flange 22 and the steel column 1 are surrounded.
The space 6 between the flange and the space 4 intersecting with each other are partitioned by the mold block 5.

As shown in FIG. 4 in particular, the mold block 5 has an upper surface higher than the upper surface of the lower flange 22 and a lower surface which makes surface contact with the upper surface of the lower flange 22, the groove 23 and the upper surface of the backing plate 32, and has a planar It is bent in an L shape, one end surface of which is in contact with the web 24, and the other end surface of which is in contact with the side surface of the steel column 1, so that the weld metal does not leak from the intersecting space portion 4. A pair is used symmetrically across the web 24. This form block 5 is made of ceramics, flux, cement or other material.

Next, in the intersection space 4 surrounded by the mold block 5, the intersection 26 of the lower flange 22 and the steel column 1 are welded. This welding is performed by inserting a welding rod into the intersection space 4 from above.
Since it can be inserted through the vertically long notch 25 along the end face of 4, the angle can be made close to vertical, and the tip of the welding rod can be freely inserted into each part in the intersection space 4. You can Therefore, the weld metal can be sequentially applied upward from the lower portion of the intersection space 4 to perform the enclosed welding. FIG. 6 shows the height of the weld metal 41 (about 1/5 to 1/7 the height of the beam, preferably 1 /
6) is shown, but the lower flange 22
The weld metal 41 is applied to the upper surface of the
The lower end face of the notch 25 of 4 is welded.

Next, both formwork blocks 5 around the weld metal 41 in the intersection space 4 are removed. At this stage, the flange space 6 appears on both sides of the weld metal 41 applied to the intersection space 4. Therefore, the groove space 6 is subjected to conventional groove welding by downward welding. Since there is no obstacle for welding on the upper side of the flange space 6, the flange space 6 can be welded reliably by normal groove welding. This groove welding is so-called "re" type groove welding because one surface is the surface of the flange 11 of the steel column 1 and the other surface is the groove 23 of the lower flange 22. FIG. 8 shows the weld metal 61 of the flange space 6 continuously on both sides of the weld metal 41 of the intersection space 4 by the enclosed welding.
1 securely attaches the lower flange 22 of the steel beam 2 to the flange 11 of the steel column 1 and also provides the intersection space 4
It is also integrally fixed to the weld metal 41.

Between the upper flange 21 and the steel column 1 shown in FIG. 1, groove welding by conventional downward welding is performed in parallel with or before or after the welding of the lower flange 22. After the welding of the flanges 21 and 22 of the steel column 1 to the joint plate 33 and the web 2 is completed.
The work is completed by fully tightening the bolts and nuts that have been temporarily fixed between No. 4 and 4.

In this embodiment, in particular, since the vertical end face of the vertically long notch 25 formed in the web 24 of the steel beam 2 is continuous with the upper end position of the groove 23 of the lower flange 22, the conventional technique is used. Such scallops do not remain, and therefore cracking of the lower flange 22 due to stress concentration is prevented.

The form block 5 may be of any other shape as long as it has a shape that partitions the intersection space 4 and the flange space 5.

[0022]

As described above, according to the present invention, the intersection space between the intersection of the lower flange and the web of the steel beam and the side surface of the column is surrounded by a form block in advance. This weld is an enclosed weld because it welds a space, and this weld is made by passing the weld rod through the longitudinal notch on the end face of the web of the beam, so that the weld rod can be brought closer to the vertical, and thus the intersection can be achieved. Since the welding operation can be performed by moving the tip of the welding rod to every corner of the space, welding with extremely few defects can be performed efficiently. Further, since it is not necessary to form a scallop on the lower flange, it is possible to prevent the lowering of the strength of the lower end portion of the steel beam. Therefore, it is possible to obtain a steel structure having high strength together with the remarkable reduction of the defect welding. You can

When the form block is made of ceramics, the form can be diverted and used repeatedly. When it is made of flux, the powdery flux is solidified by using a solidifying agent. Since it is formed by such a method, it is suitable for curing and protecting the weld metal during welding, the mold block can be easily removed after the weld metal is hardened, and the adhesion to the weld metal in the flange space is excellent. Further, when the form block is made of cement, it can be obtained at low cost.

[Brief description of drawings]

FIG. 1 is a front view of a state where a steel beam is temporarily fixed to a column.

FIG. 2 is an enlarged view of a main part of FIG.

FIG. 3 is an enlarged view of the negative line of FIG.

FIG. 4 is a perspective view showing a state in which a mold block is installed.

FIG. 5 is a plan view of FIG. 4;

FIG. 6 is a front view showing a state in which it is welded to an intersection space.

FIG. 7 is a plan view showing a state in which the form block is removed by welding in the intersection space.

FIG. 8 is a plan view showing a state where the flange space is welded after the intersection space is welded.

FIG. 9 is a front view showing a conventional technique.

[Explanation of symbols]

 1 Steel Column 11 Flange 12 Web 2 Steel Beam 21 Upper Flange 22 Lower Flange 23 Groove 24 Web 25 Cutout 26 Intersection 4 Intersection Space 5 Formwork Block 6 Flange Space

Claims (2)

[Claims] 1. A longitudinally elongated notch along the end face of the web is provided in advance on the lower flange side of the web end face of the steel beam, the steel beam is temporarily fixed between columns, and the lower flange and the web of the steel beam are connected. Enclose the intersection space formed between the intersection and the pillar by the form block, by welding between the intersection and the pillar by inserting a welding rod into the intersection space through the notch, After demolding the form block, welding between the lower flange and the column is performed in the flange portion space formed between the lower flange and the column, and the beam is joined to the column. Method. 2. A method of joining a beam to a column, wherein the form block is made of ceramics, flux or cement.