JPH1046678A - Steel curved beam - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily ensure accuracy of positional relation and to provide a curved beam having a joint section capable of being formed with sufficient strength by welding. SOLUTION: A steel curved beam is equipped with a joint section 14 joined by butting first and second steel beams respectively having up and down flanges 20 and 21 and web sections 26 lengthwise at a specific curved angle. This curved beam 10 provides a square weld plate 31 having sufficient size to cover the joint end face of first and second steel beams 18 and 19 between the first and second steel beams 18 and 19, the webs 26 of the first and second steel beams 18 and 19 are respectively fillet welded to the weld plate 31 on both sides, and the first and second steel beams 18 and 19 and weld plate 31 are mutually welded by a welding material filling a recessed section formed of the end faces opposed to the upper or the lower flanges 20 and 21 of the first and second steel beams 18 and 19 and the end face of the weld plate 31 to form.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel bent beam having a joint for connecting steel beams at a predetermined bending angle.

[0002]

[Related Art and Problems to be Solved by the Invention]
When a folded beam is formed in a wooden house, a method of joining two wooden beams using a gusset plate and the like has been adopted. However, in recent years, due to a decrease in wood resources,
It has become difficult to secure wood having sufficient strength to be used as a folded beam.

[0003] For this reason, the use of steel beams has been increasing. However, when a folded beam is formed by using a steel beam, a joint using a gusset plate is used as in the case of the above-mentioned wooden beam. It is conceivable that a bent beam is formed. However, in general, in joining using a gusset plate, it is necessary to fix the gusset plate to the beam at a number of places with fixing means such as bolts and nuts in order to ensure sufficient strength at the joint. Therefore, there is a problem in that the time and cost for this increase.

Therefore, it has been considered to form a bent steel beam by joining steel beams by welding. However, it is necessary to secure the positional relationship of the steel beams at the time of welding, in particular, the position at the time of butt welding. There is a problem that it is difficult to ensure the accuracy of the relationship.

[0005] Another problem is that swelling easily occurs on the upper surface of the steel folded beam, that is, the roof mounting surface, by welding.

[0006] Further, it is not easy to obtain a sufficient joint strength by welding at a joint portion where stress concentration occurs due to joining at a predetermined bending angle, which is higher than the strength of other portions of the steel bent beam.

[0007] The present invention has been made in view of the above problems, and an object of the present invention is to provide a joint portion which can be formed by welding while easily ensuring the accuracy of the positional relationship and has no swelling on the upper surface. The object of the present invention is to provide a steel bent beam having the same.

It is another object of the present invention to provide a steel bent beam in which the strength of a joint portion of a steel bent beam joined at a predetermined bending angle is greater than the strength of other portions.

[0009]

Means for Solving the Problems Hereinafter, in this section,
Means for achieving the above-mentioned object will be described by associating reference numerals of the embodiments of the present application with the respective constituent elements of the claims of the present application.

[0010] The steel bent beam 1 according to the first aspect of the present invention.
0, the first steel beam 18 and the second steel beam 19 having the upper and lower flange portions 20 and 21 and the web portion 26, respectively, are abutted in the longitudinal direction at a predetermined bend angle to each other. Joint 14 for joining flange and web
In the bent steel beam, a rectangular joint having a size substantially covering a joint end face of the first and second steel beams is provided between the first steel beam and the second steel beam. Plate 31
And the web portions of the first and second steel beams are fillet welded to the joining plate on both sides.

According to the first aspect of the present invention, the first and second steel beams are provided between the first and second steel beams having the upper and lower flange portions and the web portion, respectively.
A rectangular joining plate of a size substantially covering the joining end face of the steel beam is interposed, and the web portions of the first and second steel beams are fillet welded to the joining plate on both side surfaces, A first steel beam and a second steel beam are abutted in the longitudinal direction at a predetermined bending angle to obtain a bent steel beam having a joining portion that joins each flange portion and the web portion. Therefore, the web portion of the first steel beam and the web portion of the second steel beam can be joined with a large joining area via the joining plate, and the strength of the joining portion can be increased. Also,
Since the joining plate is interposed between the first and second steel beams, the joining between the first and second steel beams is first performed after the joining plate and the first or second steel beam are fixed. This facilitates alignment between the first and second steel beams.

A steel bent beam according to the second aspect of the present invention comprises a first steel beam 18 and a second steel beam having upper and lower flange portions 20 and 21 and a web portion 26, respectively. 19 in the longitudinal direction at a predetermined bend angle and a joint portion 14 for joining each flange portion and the web portion to each other, in the steel bent beam 10, wherein the first steel beam and the second steel beam are joined. A rectangular joining plate 3 sized to substantially cover the joining end surfaces of the first and second steel beams between the first and second steel beams;
1, the joining plate is configured such that at least the upper end face of the upper and lower end faces forms a recess for embedding a welding material together with the end faces of the flange portions of the first and second steel beams. The first and second steel beams and the joint plate are welded to each other by a welding material disposed between the first and second steel beams and filling the recess.

According to the second aspect of the present invention, the first and second steel beams are provided between the first and second steel beams having the upper and lower flange portions and the web portion, respectively.
A rectangular joint plate having a size substantially covering the joint end face of the steel beam is welded with at least the upper end face of the upper and lower end faces together with the end faces of the flange portions of the first and second steel beams. The first and second steel beams and the joint plate are welded to each other by a welding material that is disposed between the first and second steel beams and that fills the concave portions in a state where a concave portion is formed. A folded steel beam having a joint is obtained. Thus, the distance between the opposing end faces of the upper and lower flanges of the first and second steel beams is defined by the thickness of the joining plate, and the positional relationship between the first and second steel beams. And the first and second steel beams and the joining plate can be welded together. Also, since the upper end surface of the joining plate is located below the outer surface of the upper flange portion of the first and second steel beams, the upper surface of the steel folded beam that is the roof mounting surface does not bulge, A bent beam having a joint by welding can be formed. Furthermore, a joining plate having a shape that forms a recess together with the end surfaces of the flange portions of the first and second steel beams is also arranged on the lower end surface of the joining plate, and the first and second steel plates are used by using the recess. By welding the beam and the joining plate together, a folded beam with a stronger weld can be formed.

[0014] Claim 3 defines the invention of a steel folded beam having the features of Claims 1 and 2.

According to the invention described in claim 3, according to claim 1 of the present invention,
And the first and second steel beams are connected to each other by the web portion and the upper and lower flange portions via the joining plate. Since it is securely joined, it is possible to easily obtain a folded steel beam in which the strength of the joint is greater than the strength of other parts.

According to a fourth aspect of the present invention, in the folded steel beam according to the third aspect of the present invention, the first and second steel beams are:
Including a dividing portion 40 forming the bent angle, and a main body portion 45 joined to the dividing portion via a gusset plate 50;
Each of the divided portions of the first and second steel beams is formed in advance as a folded part 55 having the joint portion forming the predetermined bent angle. Defines the invention of the beam.

According to the fourth aspect of the present invention, when there is a limit to the size of a bent beam during transportation or the like, the first and second beams can be removed.
Of the steel beam is welded through a joining plate to form a broken part in a factory or the like, and the broken part, the main body of the first steel beam, and the main body of the second steel beam are formed. By dividing them into three parts and transporting them at the site via gussets, broken beams can be formed. Therefore, since stress concentration occurs due to joining at a predetermined bending angle, joining by welding having sufficient strength can be used particularly at a joint where strength is required. In addition, it is possible to easily carry the equipment into a narrow land or the like, and it is possible to simplify the on-site work because a joint that requires skill in welding is produced in a factory.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below more specifically with reference to the drawings.

FIG. 1 is a perspective view showing the vicinity of a joint 14 of a steel bent beam 10 of this embodiment. FIG. 2 is an exploded perspective view showing a state before welding near the joint 14 of the steel folded beam 10 of the present embodiment.

As shown in these figures, the steel folded beam 10 of this embodiment has upper and lower flange portions 20 and 21.
Between a steel beam 18 as a first steel beam and a steel beam 19 as a second steel beam, each having
The steel beam 18 and the steel beam 1 are interposed with the joining plate 31 interposed therebetween.
9 are joined in a state where they abut each other in the length direction at a predetermined bend angle. The bending angle and the length of the steel beams 18 and 19 are determined according to the building in which the steel bending beam 10 is used and its location.

The joining plate 31 disposed between the facing ends of the steel beams 18 and 19 is a square having a size substantially covering the joining end surfaces 23 and 27 of the steel beams 18 and 19. The height thereof is lower than the height of the steel beams 18, 19 by an amount corresponding to the thickness of the upper and lower flange portions 20, 21 of the steel beams 18, 19, and the inner surface of the upper flange portion 20 is reduced. 22 to inner surface 22 of lower flange portion 21
The height almost corresponds to the height up to. Therefore, a concave portion is formed by the upper end surface 32 of the joining plate 31 and the end surfaces 23 of the upper flange portions. Similarly, the lower end face 32 of the joining plate and each lower flange portion 2
A concave portion is formed by 3 and 23.

The steel bent beam 10 of the present embodiment has a steel beam 18
And a joint 14 formed by welding the steel beam 19 and the joint plate 31 to each other as follows. Hereinafter, FIG. 1, FIG. 2, FIG. 3A which is a side view schematically showing the joint portion 14, and a welded portion near a cross section at a position corresponding to line bb in FIG. FIG. 3 which is a diagram showing
Each welding will be described with reference to FIG.

Between the web portion 26 of the steel beam 18 and the joining plate 31, upper and lower flange portions 20, 21 are provided.
End face 2 of steel beam 18 excluding at least part of end face 23 of
The joining plate 31 is located at a position that almost vertically covers
And the side surfaces 28, 28 of the web portion 26 of the steel beam 18 in a state where the web portion 26 and the joining plate 31 are in contact with each other.
And the joining plate 31 are fillet welded.

Similarly, between the web portion 26 of the steel beam 19 and the joining plate 31, the upper and lower flange portions 2 are also provided.
The joining plate 31 is arranged at a position that almost vertically and symmetrically covers the end face of the steel beam 19 except for at least a part of the end faces of the steel beams 19, and the web section 26 and the joining plate 31 are in contact with each other. Each side surface 28, 28 of the web portion 26 and the joining plate 31 are fillet welded.

FIG. 1, FIG. 3A, and FIG.
As shown in (B), the end face 23 of the upper flange portion 20 of the steel beam 18 and the upper flange portion 20 of the steel beam 19
Of the steel beam 18 and the steel beam 19 by welding performed so as to fill the recess formed by the end surface of the steel plate 18 and the upper end surface 32 of the joining plate 31.
Is welded to the upper flange portion 20 and the joining plate 31. In this welding, the welded portion was a steel beam 18
And it is performed so that it may not protrude from the outer surface 24 of the upper flange portion 20 of the steel beam 19. Therefore, no swelling occurs on the upper surface of the steel folded beam 10 which is the roof mounting surface.

Similarly, the lower flange portion 2 of the steel beam 18
1, the lower end surface of the flange portion 21 of the steel beam 19, and the lower end surface 32 of the joining plate 31 by welding performed so as to fill the recess formed by the lower end surface 32 of the steel beam 19. Flange portion 21 and steel beam 19
Is welded to the lower flange 21 and the joining plate 31.

By the above welding, the steel bent beam 10 of the present embodiment having the joint portion 14 in which the steel beam 18, the steel beam 19, and the joint plate 31 are welded to each other is formed.

The folded steel beam 10 of the present embodiment is connected to the web portion 26 of the steel beam 18 and the steel beam 19 via the joining plate 31.
And the web portion 26 can be bonded with a wide bonding area, and the strength of the bonded portion can be increased. Further, since the joining plate 31 is interposed between the steel beam 18 and the steel beam 19, first, the joining plate 31 and the steel beam 18 or the steel beam 19 are fixed, and then the joining of the steel beams 18, 19 is performed. And the alignment between the steel beams 18 and 19 is facilitated.

Further, the steel bent beam 10 of the present embodiment comprises upper and lower flange portions 20, 21 of the steel beams 18, 19.
The distance between the opposite end faces 23, 23 of the
1, the accuracy of the positional relationship between the steel beams 18, 19 can be easily ensured, and the steel beams 18, 19 and the joint plate 31 can be welded to each other. Further, the steel bent beam 10 of the present embodiment includes a joining plate 31.
Is located below the outer surface of the flange portion 20 above the steel beams 18 and 19, so that the upper surface of the steel folded beam 10 which is the roof mounting surface does not bulge and is joined by welding. A folded beam having the portion 14 can be formed.

Table 1 shows the dimensions of six general lightweight H-section steels. Table 2 shows typical dimensions of the joint portion 14 when the steel folded beam 10 of the present embodiment is formed using the six types of lightweight H-section steels. In addition,
The fillet weld throat thickness in Table 2 is the fillet weld throat thickness between the joining plate 31 of the present embodiment and the respective side portions 28 of the web portions 26 of the steel beams 18 and 19, and the butt weld throat. The thickness of the opposed end faces 2 of the upper and lower flange portions 20 and 21 of the steel beam 18 and the steel beam 19 of the present embodiment is set.
It means the thickness of the welding throat that joins the end faces 32 and 23 and the end face 32 of the joining plate 31 to each other.

[0031]

[Table 1]

[0032]

[Table 2]

Table 3 shows that the steel folded beam 10 of this embodiment is formed by using each of the six types of H-shaped steels under the dimensional conditions shown in Tables 1 and 2. 10 is a comparison between the strength of the base material and the strength of the joint 14 calculated for the allowable bending moment and the allowable shear force. As is clear from these tables, when the steel folded beam 10 of the present embodiment is formed by using an H-shaped steel having a general dimension, the strength of the joint portion 14 is larger than the strength of the base material. Steel bent beam 10 having a joint portion 14 having high strength and reliability
It turns out that it becomes. This fact was also confirmed by experiments.

[0034]

[Table 3]

FIG. 4 is a perspective view showing a modification of this embodiment. As shown in this figure, the steel bent beam 1 of this modification example
0, the steel beam 18, which is the first steel beam, is divided into a predetermined angle with the steel beam 19 and joined to each other by welding. It is formed by a main body 45 joined via a plate 50. Similarly, the steel beam 19, which is the second steel beam,
The steel beam 18 is formed by a divided part 40 which is a part which is joined to each other by welding at a predetermined bending angle, and a main body part 45 which is joined to the divided part 40 via a gusset plate 50.

In the case of this modification, the divided portion 4 of the steel beam 18
0 and the divided portion 40 of the steel beam 19 are welded to each other at a predetermined angle in the same manner as in the above-described embodiment.

Thereafter, the divided portion 40 of the steel beam 18 and the main body 45 are joined to each other via a gusset plate 50 as shown in FIG. Similarly, the divided portion 40 of the steel beam 19
And the main body 45 are joined via a gusset plate 50.

According to this modification, when the size of the steel folded beam 10 at the time of transportation is limited, etc., the divided portions 40, 40 of the steel beam 18 and the steel beam 19 are connected via the joining plate 31. Is formed in a factory or the like as a broken part 55, the broken part 55, the main body 45 of the steel beam 18, and the steel beam 1
The steel folded beam 10 can be formed by transporting the steel sheet into three parts and the main body part 9 of the ninth part 9 and joining them to each other via a gusset plate 50 at the site. Therefore, since stress concentration occurs due to joining at a predetermined bending angle, joining by welding having sufficient strength can be used particularly at the joining portion 14 that requires strength. In addition, it is possible to easily carry the equipment into a narrow land or the like, and to simplify the on-site work because the joints 14 requiring skill in welding are produced in a factory.

Although the embodiments of the present invention have been described above, the present invention is not limited to each of the above-described embodiments, and various modifications may be made within the scope of the present invention or within the equivalent scope of the claims. Modifications are possible.

For example, in the above embodiment, the joining plate 3
1 shows an example in which both the upper and lower end faces 32 are arranged so as to be located inside the outer faces of the upper or lower flange portions 20 and 21, but at least the lower end face 32 of the joining plate 31 is Outer surface 2 of steel beams 18 and 19
The steel folded beam 10 may be formed so as to be located at the same level as or outside of the steel beam 4.

[0041]

As described above, according to the first aspect of the present invention, the web portion of the first steel beam and the web portion of the second steel beam can be joined with a wide joint area via the joining plate. Joining can be performed, and the strength of the joint can be increased. Further, since the joining plate is interposed between the first and second steel beams, first, the joining plate and the first or second steel beam are fixed, and then the first and second steel beams are connected to each other. Joining is facilitated and alignment between the first and second steel beams is facilitated.

According to the second aspect of the present invention, the distance between the opposed end faces of the upper and lower flange portions of the first and second steel beams is defined by the thickness of the joining plate, The first and second steel beams and the connecting plate can be welded to each other while easily ensuring the accuracy of the positional relationship between the first and second steel beams. Also, since the upper end surface of the joining plate is located below the outer surface of the upper flange portion of the first and second steel beams, the upper surface of the steel folded beam that is the roof mounting surface does not bulge, A bent beam having a joint by welding can be formed. Furthermore, a joining plate having a shape that forms a recess together with the end surfaces of the flange portions of the first and second steel beams is also arranged on the lower end surface of the joining plate, and the first and second steel plates are used by using the recess. By welding the beam and the joining plate together, a folded beam with a stronger weld can be formed.

According to the third aspect of the present invention, the first and second steel beams are securely joined to each other at the web portion and the upper and lower flange portions via the joining plate. It is possible to easily obtain a folded steel beam having a strength greater than that of the other parts.

According to the fourth aspect of the present invention, a joint having a sufficient strength may be used in a joint where a joint is formed at a predetermined bending angle and stress concentration occurs, and particularly strength is required. it can. In addition, it is possible to easily carry the equipment into a narrow land or the like, and it is possible to simplify the on-site work because a joint that requires skill in welding is produced in a factory.

[Brief description of the drawings]

FIG. 1 is a perspective view showing the vicinity of a joint portion of a steel bent beam of an example.

FIG. 2 is an exploded perspective view of the vicinity of a joint portion of the steel beam of the embodiment.

FIG. 3A is a side view of the vicinity of a joint showing a welded state of the steel bent beam of the example, and FIG. 3B is a view of the vicinity of the cross section taken along the line bb shown in FIG. FIG. 4 is a view showing only a welded portion of FIG.

FIG. 4 is a perspective view showing a modified steel bent beam.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Folded steel beam 14 Joint part 18 Steel beam (first steel beam) 19 Steel beam (second steel beam) 20, 21 Flange part 23 End face 24 Outer surface 26 Web part 27 End face 28 Side face 31 Joint Plate 32 End face 40 Dividing part 45 Body part 50 Gusset plate 55 Folded part

Claims (4)

[Claims] 1. A first steel beam and a second steel beam having upper and lower flange portions and a web portion, respectively, are abutted in a longitudinal direction at a predetermined bend angle, and the respective flange portions and webs are joined. In a folded steel beam having a joining portion for joining portions, a joining end face of the first and second steel beams is substantially disposed between the first steel beam and the second steel beam. A folded steel beam, wherein a rectangular joining plate having a size to cover is interposed, and the web portions of the first and second steel beams are fillet-welded to both sides of the joining plate. 2. A first steel beam and a second steel beam having upper and lower flange portions and a web portion, respectively, are abutted in a longitudinal direction at a predetermined bend angle, and the respective flange portions and webs are joined. In a folded steel beam having a joining portion for joining portions, a joining end face of the first and second steel beams is substantially disposed between the first steel beam and the second steel beam. A rectangular joining plate of a size to cover is interposed, and the joining plate has at least an upper end surface of upper and lower end surfaces together with an end surface of the flange portion of the first and second steel beams and a recess for embedding a welding material. In a state that forms
The first and second steel beams are disposed between the first and second steel beams, and the first and second steel beams are filled with the welding material.
A bent steel beam, wherein the steel beam and the joining plate are welded to each other. 3. The joint plate according to claim 1, wherein at least an upper end surface of the upper and lower end surfaces forms a recess for embedding a welding material together with the end surfaces of the flange portions of the first and second steel beams. In a state where
The first and second steel beams are disposed between the first and second steel beams, and the first and second steel beams are filled with the welding material.
A bent steel beam, wherein the steel beam and the joining plate are welded to each other. 4. The steel beam according to claim 3, wherein the first and second steel beams include a divided portion forming the bent angle, and a main body connected to the divided portion via a gusset plate. Each of the divided portions of the first and second steel beams is formed in advance as a folded part having the joint portion forming the predetermined bent angle. Beams.