Beam joint structure and steel frame building

Abstract

To achieve improved productivity, workability, and logistics loading effect by using an automatic welding line in a factory to weld each plate and improve the efficiency of transporting H-shaped steel to the site.SOLUTION: A first gusset plate 5 is provided between upper and lower flanges 2 and 3 of a first beam (big beam) 1 so as not to protrude from the side edge of the flange. A second gusset plate 15 is provided on a web 14 of a second beam (small beam) 10 so as to protrude toward the first gusset plate 5 side. The first gusset plate 5 and the second gusset plate 15 are joined with a fastening material 17 between the upper and lower flanges 2 and 3 of the first beam (big beam) 1.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present disclosure relates to a beam joint structure and a steel-framed building using the same. [Background technology]

[0002] BACKGROUND ART Conventionally, steel-framed buildings using H-shaped steel beams have been known (see Patent Document 1). The conventional construction method for this type involves welding gusset plates to connect beams to H-shaped steel in a factory, then transporting the steel to the site and assembling it. Gusset plates are typically welded in factories using robotic welding machines installed on automated welding lines. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2005-133461 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the production of steel frame structures (beam members) for residential buildings, for example, it is desirable to reduce the number of welds, the number of bolts, and the environmental impact. Furthermore, because the automatic welding line transports the H-beams with the web side facing the conveyor, protrusions that protrude beyond the flange side edge of the H-beam cannot be provided. If protrusions protrude beyond the flange side edge of the H-beam, they will be bulky when transported from the factory to the site, reducing transport efficiency and reducing loading efficiency, which poses the problem of making it difficult to reduce CO2 emissions.

[0005] The purpose of this disclosure is to provide a beam joint structure and a steel-framed building using the same, which allows gusset plates to be welded using an automatic welding line within a factory, improving the efficiency of transporting H-shaped steel to the site, thereby improving productivity and workability, saving labor, and achieving logistics loading effects. [Means for solving the problem]

[0006] The present disclosure relates to a beam joint structure using an H-shaped steel beam, in which a first gusset plate is provided between the upper and lower flanges of a first beam without protruding beyond the flange side edge, and a second gusset plate is provided on the web of a second beam so as to protrude toward the first gusset plate, and the first gusset plate and the second gusset plate are joined by fastening materials between the upper and lower flanges of the first beam. The first gusset plate is joined to the flange at a predetermined distance inward from the flange side edge. There are no protrusions protruding from the side edges of the flanges of the H-shaped steel beams, making it possible to join the gusset plates using an automatic welding line in the factory. By simplifying the welding points, productivity and workability can be improved, and the efficiency of transporting H-beams to the site can be improved, resulting in logistics loading effects.

[0007] The present disclosure provides that the first gusset plate may be an approximately rectangular plate, the direction in which the long side of the first gusset plate extends is perpendicular to the length direction of the first beam, the direction in which the short side of the first gusset plate extends is the same as the width direction of the first beam, and the first gusset plate may be joined between the upper and lower flanges of the first beam. This improves workability when joining the first and second gusset plates between the upper and lower flanges of the first beam with fastening materials.

[0008] In the present disclosure, one surface of the second gusset plate may be welded to a side surface of the web of the second beam, and the other surface of the second gusset plate may be welded to an end surface of the web. A second gusset plate can be rigidly joined to the web of the second beam.

[0009] In the present disclosure, the first gusset plate may be joined inward from the flange side edge by a predetermined distance. When the first and second gusset plates are aligned between the upper and lower flanges of the first beam and joined with fastening materials, the alignment becomes easy.

[0010] The present disclosure may include a steel column joined to the H-shaped steel via a joining plate, the joining plate being bolted to the flange surface of the first beam at the corner across the first gusset plate, and the steel column being bolted to the center of the joining plate. When joining a steel column to the flange directly above or below the first gusset plate of the first beam, the H-shaped steel beam and steel column can be joined without interfering with the first gusset plate, improving workability when fastening the steel column and beam and reducing labor during erection work. The first gusset plate also contributes to reinforcing the beam.

[0011] The present disclosure is characterized in that a steel-framed building using H-shaped steel beams is provided with cross joints, T-shaped joints, and L-shaped joints that join the beams, and each of the joints has a beam connection structure described in any one of claims 1 to 4. By simplifying the welding points, productivity and workability can be improved, and the efficiency of transporting H-beams to the site can be improved, resulting in logistics loading effects. [Effects of the Invention]

[0012] The number of welding points is reduced, making it easier to carry out automatic transport and automatic welding (inspection), reducing the environmental impact, and CO2 emissions can be reduced through more efficient loading. Labor savings can also be achieved by reducing the number of bolts. Since the first gusset plate is joined between the upper and lower flanges of the H-shaped steel so that it does not protrude beyond the flange side edge, there are no protrusions that protrude beyond the flange side edge of the H-shaped steel, and the gusset plate can be welded using an automatic welding line. This simplifies the welding points, improving productivity and workability, and improving the efficiency of transporting the H-shaped steel to the site, resulting in logistics loading effects. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a perspective view of a beam joint structure of a steel-framed building according to an embodiment of the present invention; [Figure 2] FIG. 2 is a view taken along the arrow A in FIG. [Figure 3] FIG. [Figure 4] An enlarged view of the T-junction. [Figure 5] This is an enlarged view of the L-shaped joint. [Figure 6] FIG. 2 is a view taken along arrow B in FIG. [Figure 7] FIG. DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. Figure 1 shows the beam connection structure between the first and second floors of a steel-framed building. This beam joint structure includes a cross joint 51, a T-shaped joint 52, an L-shaped joint 53, and a beam-to-beam joint 54. Reference numeral 55 denotes a steel column on the first floor, and reference numeral 56 denotes a steel column on the second floor.

[0015] FIG. 2 is a view taken along the arrow A in FIG. In the cross joint 51, two second beams (minor beams) 10, also made of H-shaped steel, are connected in a cross shape to both sides of a first beam (main beam) 1, also made of H-shaped steel. The second beams 10 are perpendicular to the first beam 1. The first beam 1 has an upper flange 2, a lower flange 3, and a web 4 connecting the upper and lower flanges 2, 3. The second beam 10 has an upper flange 12, a lower flange 13, and a web 14 connecting the upper and lower flanges 12, 13.

[0016] FIG. 3 is an enlarged view of the cross joint 51. As shown in FIG. As shown in Fig. 3, a pair of first gusset plates 5, 5 are provided on both sides of the web 4 of the first beam 1. The first gusset plates 5, 5 on the left and right sides in the drawing are provided in the same shape. The first gusset plate 5 is an approximately rectangular plate, the direction in which the long side of the first gusset plate 5 extends is perpendicular to the length direction of the first beam 1, and the direction in which the short side of the first gusset plate 5 extends coincides with the width direction of the first beam 1, and the first gusset plate 5 is joined between the upper and lower flanges 2 and 3 of the first beam 1. The first gusset plate 5 is joined to the first beam 1 in a state where it does not protrude laterally beyond the flange side edges 2A and 3A. The first gusset plate 5 is positioned inward by a predetermined distance L from the flange side edges 2A and 3A. The short sides of the first gusset plate 5 are joined to the inner surfaces of the upper and lower flanges 2 and 3 by welding (weld beads 5A and 5B), and the long side of the first gusset plate 5 on the web 4 side is joined to the web 4 by welding (weld bead 5C).

[0017] A second gusset plate 15 is provided on the side surface (surface extending in the longitudinal direction of the second beam 10) of the web 14 of the second beam 10, protruding toward the first gusset plate 5 of the first beam 1. The second gusset plate 15 protrudes from the end surface (surface at the end of the longitudinal direction of the second beam 10) of the web 14 of the second beam 10 and extends in the longitudinal direction of the second beam 10. The second gusset plates 15 on the left and right sides of the drawing are provided in the same shape. The second gusset plate 15 is joined by welding (weld bead 14A) to one surface (front surface in the drawing) of the web 14 of the second beam 10, as shown by the second gusset plate 15 on the right in the drawing. The second gusset plate 15 is also joined by welding (weld bead 14B) to the end surface of the web 14 of the second beam 10 from the other surface (back surface in the drawing), as shown by the second gusset plate 15 on the left in the drawing. The height H of the first gusset plate 5 is set smaller than the inside dimension H1 of the upper and lower flanges 2, 3. The second beam 10 can be joined to the first beam 1 with the weld bead 14B on the other surface of the second gusset plate 15 remaining open. Furthermore, a gap L1 is provided between the first beam 1 and the second beam 10. This makes it possible to prevent interference at the overlapping portions of the beams.

[0018] The second gusset plate 15 of the second beam 10 on the right in the drawing is flush with the first gusset plate 5 from the front side in the drawing, between the upper and lower flanges 2 and 3 of the first beam 1, and is fastened with four bolts (high-strength bolts) 17 and nuts 18. The four bolts 17 and nuts 18 constitute fastening materials. The second gusset plate 15 of the second beam 10 on the left in the drawing is flush with the first gusset plate 5 from the back side in the drawing, between the upper and lower flanges 2 and 3 of the first beam 1, and is fastened with four bolts 17 and nuts 18.

[0019] The four bolts 17 are arranged in a row in the direction between the upper and lower flanges 2 and 3 of the first beam 1. The first gusset plate 5 and the second gusset plate 15 are each provided with bolt holes (not shown) through which the four bolts 17 pass. To prevent the second beam 10 from sagging relative to the first beam 1 due to its own weight due to dimensional tolerances between the bolt 17 and the bolt hole (not shown), the bolt hole (not shown) in the second gusset plate 15 is located slightly higher than the bolt hole (not shown) in the first gusset plate 5.

[0020] Fig. 4 is an enlarged view of the T-shaped joint 52 at the bottom in Fig. 1. At the T-shaped joint 52, the second beam 10 is connected perpendicularly to the first beam 1. Fig. 5 is an enlarged view of the L-shaped joint 53. At the L-shaped joint 53, the second beam 10 is similarly connected perpendicularly to the first beam 1. The joint structures of the T-shaped joint 52 in FIG. 4 and the L-shaped joint 53 in FIG. 5 are the same as those in FIG. 3, so the same parts as those in FIG. 3 are given the same reference numerals and their description will be omitted.

[0021] This steel-framed building has the same structure at each of the cross joints 51, T-joints 52, and L-joints 53. The first beam 1, second beam 10, first gusset plate 5, and second gusset plate 15 of the H-shaped steel used in this joint structure have the same shape and dimensions. This reduces the number of parts, simplifies parts management, reduces the number of bolts, and saves labor.

[0022] In this embodiment, each first beam 1 used as a beam in this steel-framed building has a first gusset plate 5 joined between the upper and lower flanges 2, 3 so that it does not protrude laterally beyond the flange side edges 2A, 3A. Therefore, by utilizing an existing automatic welding line (not shown) within the factory, the first gusset plate 5 can be welded to the first beam 1 while the first beam 1 is being conveyed on a conveyor (not shown) with the side of the web facing the conveyor, thereby improving productivity and workability by simplifying the welding points. Since the first gusset plate 5 does not protrude laterally beyond the flange side edges 2A, 3A of the first beam 1, it is not bulky, the efficiency of transportation from the factory to the site is improved, and a logistics loading effect is obtained. Furthermore, for example, in the production of steel frame structures (beam members) for residential buildings, the number of welds is reduced, the number of bolts is reduced, and the environmental impact is reduced.

[0023] The second gusset plate 15 protrudes from the end of the second beam 10 . However, since the protruding direction coincides with the conveying direction of the automatic welding line (not shown), it does not interfere with conveyance, and therefore the second gusset plate 15 can be welded using the automatic welding line (not shown).

[0024] As shown in FIG. 5, the beam-to-beam joint 54 joins the ends of the two first beams 1, 1 together with bolts. As in Figure 3, a second gusset plate 15 is joined to surface 4A of the web 4 of the first beam 1 on the left side of the figure. The second gusset plate 15 is flush with surface 4B of the web 4 of the first beam 1 on the right side of the figure. Bolt holes (not shown) are provided on surface 4B of the web 4. The second gusset plate 15 of the first beam 1 on the left in the drawing is fastened to the surface 4B of the web 4 of the first beam 1 on the right in the drawing with a bolt 17 and a nut 18.

[0025] The bolt connections between the ends of the two first beams 1, 1 have the same structure at multiple locations in this steel-framed building. Although not shown in the figure, the bolt connections between the ends of the two second beams 10, 10 also have the same structure. In this embodiment, the second gusset plate 15 can be welded using a robot welding machine on an automatic welding line (not shown).

[0026] In this steel-framed building, as shown in Fig. 1, a steel column 55 on the first floor and a steel column 56 on the second floor are connected to the first beam 1 and the second beam 10. The steel columns 55 and 56 are hollow square steel pipes. FIG. 6 is a view taken along the arrow B in FIG. At the connection portion of the steel columns 55, 56, a first gusset plate 5 (rib plate) for reinforcement is joined between the upper and lower flanges 2, 3 of the first beam 1 in the same manner as in FIG. As shown in Figure 6, the steel column 55 on the first floor is joined to the lower flange 3 of the first beam 1 via a joining plate 57, and the steel column 56 on the second floor is joined to the upper flange 2 of the first beam 1 via a joining plate 58. In this steel-framed building, each steel column is connected to the first beam 1 and the second beam 10 via a connecting plate (hole diameter changer plate) of similar configuration.

[0027] Next, we will explain the connecting plate on the second floor side. The connecting plate 58 on the second floor side is rectangular in plan view, as shown in Fig. 7. Bolts 61 are embedded in the four corners of the connecting plate 58, and two female threaded holes 62 are provided in the center of the connecting plate 58. As shown in Fig. 6, the four bolts 61 of the connecting plate 58 straddle the first gusset plate 5 and are inserted into bolt holes (not shown) provided on the surface 2B of the upper flange 2, and are fastened by nuts 63 on the underside of the upper flange 2.

[0028] A steel column 56 for the second floor is joined onto the joining plate 58. A base plate 56A is joined to the lower end of the steel column 56, and two bolt holes (not shown) are formed in the base plate 56A. Bolts 65 are inserted into the two bolt holes (not shown) and screwed into two female threaded holes 62 of the joining plate 58, thereby joining the steel column 56 for the second floor. An opening 66 is provided at the lower end of the steel column 56, and a tool is inserted into the opening 66 when tightening or loosening the bolt 65. The first floor side joint plate 57 has the same configuration as the second floor side joint plate 58, so the same parts are given the same reference numerals and their explanations are omitted.

[0029] In this embodiment, the steel columns 55, 56 are joined via joining plates 57, 58, so when joining the steel columns 55, 56 directly above or below the first gusset plate 5 of the first beam 1, the joining can be performed without interference from the first gusset plate 5. The first gusset plate 5 can also contribute to reinforcing the first beam 1. [Explanation of symbols]

[0030] 1 First beam (H-beam) 2 Upper flange 3 Lower flange 4. Web 5 First gusset plate 10 Second beam (H-beam) 12 Upper flange 13 Lower flange 14. Web 14A Web Surface 14B End 15 Second gusset plate 17 Bolts (fasteners) 55, 56 Steel columns 57, 58 Joint plate

Claims

1. In a beam joint structure using H-shaped steel beams, a first gusset plate is provided between the upper and lower flanges of the first beam without protruding beyond the flange side edges, a second gusset plate is provided on the web of the second beam so as to protrude toward the first gusset plate, and the first gusset plate and the second gusset plate are joined by fastening materials between the upper and lower flanges of the first beam, The first gusset plate is joined to a beam joint structure inward from the flange side edge by a predetermined distance.

2. In a beam joint structure using H-shaped steel beams, a first gusset plate is provided between the upper and lower flanges of the first beam without protruding beyond the flange side edges, a second gusset plate is provided on the web of the second beam so as to protrude toward the first gusset plate, and the first gusset plate and the second gusset plate are joined by fastening materials between the upper and lower flanges of the first beam, A beam connection structure characterized in that it comprises a steel column connected to the H-shaped steel via a connecting plate, the connecting plate being bolted to the corner of the flange surface of the first beam, spanning the first gusset plate, and the steel column being bolted to the center of the connecting plate.

3. the first gusset plate is a substantially rectangular plate, The beam joint structure according to claim 1 or 2, characterized in that the direction in which the long side of the first gusset plate extends is perpendicular to the length direction of the first beam, the direction in which the short side of the first gusset plate extends coincides with the width direction of the first beam, and the first gusset plate is joined between the upper and lower flanges of the first beam.

4. A beam joint structure according to any one of claims 1 to 3, characterized in that one surface of the second gusset plate is welded to the side surface of the web of the second beam, and the other surface of the second gusset plate is welded to the end surface of the web.

5. In steel-frame buildings that use H-shaped steel beams, A cross joint, a T-joint, and an L-joint are provided to join the beams, A steel-framed building, characterized in that each of the joints has a beam joint structure according to any one of claims 1 to 4.

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