Beam joint structure and its construction method

Abstract

The present invention provides a beam-to-beam joint structure and a construction method thereof, which allows for the fixing of an upper column by positioning a fastening member on the first H-shaped steel beam at a position on the extension of the web of the second H-shaped steel beam. [Solution] The beam-to-beam joint structure involves butting the end of the second H-shaped steel beam 2 against the side of the first H-shaped steel beam 1, and joining them perpendicularly to each other using a beam joint member 3. The upper flange 1H of the first H-shaped steel beam 1 has two upper column fixing insertion holes 51 formed on the extension of the web 2W of the second H-shaped steel beam 2, sandwiching the web 1W of the first H-shaped steel beam 1, through which bolts and nuts 43 for fixing the upper column 5H attached to the upper flange 1H are inserted. The upper edge 32a of the second plate portion 32 of the beam joint member 3 has a height position that receives the head of the bolt of the bolt and nut 43 passed through the upper column fixing insertion hole 51 from below and temporarily holds the bolt and nut 43.

Description

Technical Field

[0001] This invention relates to a joining structure for beams arranged orthogonally to each other and joined by beam joining members, and a construction method thereof.

Background Art

[0002] As a structure for joining a large beam and a small beam arranged orthogonally to each other, an end plate joining structure is known. In this end plate joining structure, after installing the floor slab on the beam, the working space around the column is narrowed, and bolts and nuts for joining the column to the flange of the beam cannot be installed. Therefore, before installing the floor slab, work is carried out to temporarily hold the bolts to the flange of the beam using clips. For example, Patent Document 1 discloses a clip that can perform bolt-nut joining by restraining the movement of the nut in advance without applying a welding nut or the like.

[0003] Also, as a structure for joining a large beam and a small beam arranged orthogonally to each other, a structure using a joining metal is known. Patent Document 2 discloses a beam joining structure in which a first gusset plate is provided between the upper and lower flanges of a first beam in a state where it does not protrude from the side edge of the flange, a second gusset plate is provided on the web of the second beam so as to protrude to the side of the first gusset plate, and the first gusset plate and the second gusset plate are joined by a fastening material between the upper and lower flanges of the first beam.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, while the structure using the connecting hardware described in Patent Document 2 shows a structure in which the column on the beam is fixed with two bolts, it does not show a structure in which the bolt is positioned on the main beam at a position on the extension of the web of the secondary beam to fix the column.

[0006] In view of the above circumstances, this invention aims to provide a beam-to-beam joint structure and a method for constructing the same, which allows a column to be fixed by positioning a fastening member on the first steel beam at a position on the extension of the web of the second steel beam. [Means for solving the problem]

[0007] The beam-to-beam joint structure according to this invention solves the above problem by butting the end of a second steel beam against the side of a first steel beam and joining them perpendicularly to each other using a beam joint member. The beam joint member described above has a T-shaped configuration comprising a first plate portion facing the web of the first steel beam and fastened to the web by a fastening member, and a second plate portion facing the web of the second steel beam and fastened to the web by a fastening member. The upper flange of the first steel beam has multiple upper column fixing insertion holes formed on the extension of the web of the second steel beam, sandwiching the web of the first steel beam, through which column fastening members for fixing the upper column attached to the upper flange are inserted. The lower flange of the first steel beam is characterized in that multiple insertion holes for fixing a lower column, through which a column fastening member for fixing a lower column to be attached below the lower flange is inserted, are formed on the extension of the web of the second steel beam, sandwiching the web of the first steel beam.

[0008] With the above configuration, the upper flange of the first steel beam has multiple insertion holes for fixing the upper column, which are formed on the extension of the web of the second steel beam, sandwiching the web of the first steel beam. Therefore, at the joint between the first and second steel beams, a structure can be realized in which the upper column on the upper flange of the first steel beam is fixed with multiple column fastening members. With such a structure, the column fastening members can be positioned on the line of the web of the second steel beam (on the module center), resulting in stable structural performance, easier design, and improved productivity.

[0009] The upper edge of the second plate portion of the beam joint member may have a height position that receives the head of the column fastening member located below the insertion hole for fixing the upper column, which is passed through from below, and temporarily holds the column fastening member. This allows the column fastening member that fixes the upper column to be temporarily held without a clip.

[0010] A recess may be formed at the lower edge of the second plate portion of the beam joint member to avoid interference with the protruding portion of the column fastening member that passes through the lower column fixing insertion hole. This prevents a reduction in strength when the overall height of the second plate portion is reduced, as the recess prevents interference with the protruding portion of the column fastening member.

[0011] The upper flange of the first steel beam may have multiple additional upper column fixing insertion holes arranged parallel to the line connecting the multiple upper column fixing insertion holes, and the lower flange of the first steel beam may have multiple additional lower column fixing insertion holes arranged parallel to the line connecting the multiple lower column fixing insertion holes. This allows the upper column and the lower column to be fixed with, for example, four column fastening members.

[0012] At the center of the beam joint member in the height direction, plate members may be welded horizontally to both the second plate and the first plate on both sides of the second plate. This improves the strength of the beam joint member.

[0013] The plate member located on the side of the second steel beam that does not contact the web may be extended on the second plate portion to the point where it intersects with the web of the second steel beam and welded to the second plate portion. This further improves the strength of the beam joint member.

[0014] The plate member described above may be a brace sheet to which horizontal braces are connected. In this case, the tensile force acting on the horizontal braces can be received by the beam connection member.

[0015] Furthermore, the construction method of this invention is a construction method for constructing a beam-to-beam joint structure that temporarily holds the column fastening member, characterized in that the beam joint member is positioned between the upper and lower flanges of the first steel beam, and when the beam joint member is attached to the web of the first steel beam by the fastening member, the column fastening member for fixing the upper column is inserted from below into the upper column fixing insertion hole of the upper flange of the first steel beam, and the upper edge of the second plate portion of the beam joint member receives the head of the column fastening member located below it and temporarily holds the column fastening member.

[0016] The process of temporarily holding the column fastening member by receiving its head, which is located below the beam fastening member, with the upper edge of the second plate portion of the beam joint member may be performed before the first steel beam is transported to the construction site. For example, if the column fastening member is temporarily held in place by the beam joint member that has been pre-installed at the factory, the amount of work required at the construction site can be reduced. [Effects of the Invention]

[0017] With this invention, at the joint between beams, the column fastening member that secures the upper column on the upper flange of one beam can be temporarily held without a clip, and the upper column can be secured by positioning, for example, two bolts on the main beam at a position on the extension of the web of the secondary beam. [Brief explanation of the drawing]

[0018] [Figure 1]It is a figure showing the joining structure between the beams of the embodiment. In the figure (A), it is a perspective view of the joining structure seen from one side, and in the figure (B), it is a perspective view showing the second H-shaped steel beam in the joining structure. [Figure 2] It is a figure showing the joining structure between the beams of FIG. 1. In the figure (A), it is a perspective view of the joining structure seen from the other side, and in the figure (B), it is a perspective view showing the second H-shaped steel beam in the joining structure. [Figure 3] It is a figure showing the joining structure between the beams of FIG. 1. In the figure (A), it is an elevation view of the joining structure, and in the figure (B), it is an explanatory view showing a part of the joining structure enlarged. [Figure 4] It is a plan view showing the joining structure between the beams of FIG. 1. [Figure 5] It is a construction drawing showing the construction content in the joining structure between the beams of FIG. 1. In the figure (A), it is an explanatory view showing the operation of fixing the base plate part of the upper column to the column fastening member in the temporarily held state, and in the figure (B), it is an explanatory view seen from the side of the second H-shaped steel beam.

Mode for Carrying Out the Invention

[0019] Hereinafter, embodiments of this invention will be described based on the accompanying drawings. As shown in FIGS. 1(A)(B) and FIGS. 2(A)(B), the joining structure 8 between the beams of the embodiment is a structure in which the end of the second H-shaped steel beam 2 (small beam) is abutted against the side surface portion of the first H-shaped steel beam 1 (main beam), and these are joined to be orthogonal to each other by the beam joining member 3.

[0020] The beam joining member 3 includes a first plate portion 31 and a second plate portion 32 that are in a T shape in plan view. The first plate portion 31 and the second plate portion 32 are each made of a steel plate and are fixed to each other, for example, by fillet welding.

[0021] The first plate portion 31 is a portion facing the web 1W of the first H-shaped steel beam 1, and is fastened and fixed to the web 1W by bolts and nuts 41 (fastening members) in a factory or the like. Holes through which the bolts of the bolts and nuts 41 are inserted are formed in two on each side of the first plate portion 31 with the second plate portion 32 interposed therebetween.

[0022] The second plate portion 32 faces the web 2W of the second H-shaped steel beam 2 and is fastened to the web 2W by bolts and nuts 42 (fastening members) at the construction site. The second plate portion 32 has, for example, four holes in a vertical row through which the bolts of the bolts and nuts 41 are inserted.

[0023] As shown in Figure 4, the upper flange 1H of the first H-shaped steel beam 1 has two upper column fixing insertion holes 51 formed on the extension of the web 2W of the second H-shaped steel beam 2, sandwiching the web 1W of the first H-shaped steel beam 1. These holes are through which bolts and nuts 43 (column fastening members) for fixing the upper column 5H, which is attached to the upper flange 1H, are inserted.

[0024] As shown in Figures 3(A) and 3(B), the upper edge 32a of the second plate portion 32 of the beam joint member 3 has a height position that receives the bolt head located below the bolt that is passed through the upper column fixing insertion hole 51 of the bolt and nut 43 from below, and temporarily holds the bolt. The distance between the upper edge 32a of the second plate portion 32 and the lower surface of the upper flange 1H is greater than the thickness (height) of the bolt head, for example, about 15 mm to 30 mm. The threaded portion of the bolt that is temporarily held protrudes a predetermined length from the upper surface of the upper flange 1H.

[0025] The lower flange 1L of the first H-shaped steel beam 1 has two lower column fixing insertion holes 52 formed on the extension of the web 2W of the second H-shaped steel beam 2, sandwiching the web 1W of the first H-shaped steel beam 1, through which bolts and nuts 44 (column fastening members) for fixing the lower column 5L attached below the lower flange 1L are inserted.

[0026] A trapezoidal recess 32b is formed on the lower edge of the second plate portion 32 of the beam joint member 3 to avoid interference with the protruding portion of the bolt and nut 44 that are passed through the insertion hole 52 for fixing the lower column. Furthermore, this recess 32b is sized to allow the attachment of a tightening tool for the bolt and nut 44.

[0027] With the above configuration, the upper flange 1H of the first H-shaped steel beam 1 has two through-holes 51 for fixing the upper column, formed on the extension of the web 2W of the second H-shaped steel beam 2, flanking the web 1W of the first H-shaped steel beam 1. Therefore, at the joint between the first H-shaped steel beam 1 and the second H-shaped steel beam 2, a structure can be realized in which the upper column 5H on the upper flange 1H of the first H-shaped steel beam 1 is fixed with two or more bolts and nuts 43. With such a structure, the bolts and nuts 43 and 44 can be positioned on the line of the web 2W of the second H-shaped steel beam 2 (on the module center), resulting in stable structural performance, easier design, and improved productivity.

[0028] If the upper edge 32a of the second plate portion 32 has a height position that receives the bolt head located below the bolt that has been passed through the upper column fixing insertion hole 51 of the bolt and nut 43 from below, and temporarily holds the bolt, then the bolt and nut 43 that fix the upper column 5H can be temporarily held without a clip. On the other hand, it is not essential that the upper edge 32a is at the height position described above, and the bolt and nut 43 that fix the upper column 5H may be temporarily held with a clip.

[0029] If a trapezoidal recess 32b is formed on the lower edge of the second plate portion 32 of the beam joint member 3 to avoid interference with the protruding portion of the bolt and nut 44 passed through the lower column fixing insertion hole 52, it is possible to prevent a decrease in strength when the approximate overall height (vertical width) of the second plate portion 32 is reduced. Of course, this is not the only configuration, and a structure in which the approximate overall height of the second plate portion 32 is reduced while the thickness of the second plate portion 32 is increased may also be used.

[0030] Furthermore, as shown by the dashed line in Figure 1(A), two additional upper column fixing insertion holes may be formed in the upper flange 1H of the first H-shaped steel beam 1, parallel to the line connecting the two upper column fixing insertion holes 51, and two additional lower column fixing insertion holes may be formed in the lower flange 1L of the first H-shaped steel beam 1, parallel to the line connecting the two lower column fixing insertion holes 52. In this configuration, the upper column 5H and the lower column 5L can each be fixed with four column fastening members.

[0031] Furthermore, in the beam joint structure 8 of this embodiment, at the height-direction center of the beam joint member 3, plate members 71 and 72 are horizontally welded and fixed to the second plate portion 32 and the first plate portion 31, respectively, on both sides of the second plate portion 32. Plate member 71 is located on the side that contacts the web 2W of the second H-shaped steel beam 2, and plate member 72 is located on the side that does not contact the web 2W of the second H-shaped steel beam 2. By including plate members 71 and 72 in the beam joint member 3, the strength of the beam joint member 3 is improved (the strength of the beam joint member 3 in the weak axis direction is ensured).

[0032] Furthermore, the plate member 72 extends on the second plate portion 32 to the point where it intersects with the web 2W of the second H-shaped steel beam 2, and is welded and fixed to the second plate portion 32 at this extension point, thereby further improving the strength of the beam joint member 3. The plate members 71 and 72 are brace sheets, and the ends of the horizontal braces 7 are connected to these plate members 71 and 72 by bolts and nuts. This allows the beam joint member 3 to withstand the tensile force acting on the horizontal braces 7.

[0033] Figures 5(A) and 5(B) show an outline of the construction method for constructing the beam-to-beam joint structure 8. In this construction method, a beam joint member 3 is positioned between the upper and lower flanges 1H and 1L of the first H-shaped steel beam 1. When attaching this beam joint member 3 to the web 1W of the first H-shaped steel beam 1 with bolts and nuts 41, the bolt of the bolt and nut 43 for fixing the upper column 5H is inserted from below into the upper column fixing insertion hole 51 of the upper flange 1H of the first H-shaped steel beam 1. The lower head of the bolt of the bolt and nut 43 is received by the upper edge 32a of the second plate portion 32 of the beam joint member 3, and the bolt is temporarily held in place.

[0034] Furthermore, in the construction method of this embodiment, the lower head of the bolt of the bolt and nut 43 is received by the upper edge 32a of the second plate portion 32 of the beam joint member 3 and the bolt is temporarily held in place before the first H-shaped steel beam 1 is transported to the construction site. For example, if the bolt of the bolt and nut 43 is temporarily held in place by the beam joint member 3 which has been temporarily attached in advance at the factory, the amount of work required at the construction site can be reduced. Of course, the beam joint member 3 can also be attached to the first H-shaped steel beam 1 at the construction site to temporarily hold the bolt of the bolt and nut 43.

[0035] Although embodiments of this invention have been described above with reference to the drawings, this invention is not limited to the illustrated embodiments. Various modifications and variations can be made to the illustrated embodiments within the same scope as this invention, or within the equivalent scope. [Explanation of symbols]

[0036] 1:First H-shaped steel beam 1H: Upper flange 1L: Lower flange 1W: Web 2:Second H-shaped steel beam 2W: Web 3: Beam connecting member 5H: Upper column 5L: Lower pillar 7: Horizontal brace 8: Beam connection structure 31:First plate part 32:Second plate part 32a: Upper edge 32b: recess 41: Bolts and nuts (fastening components) 42: Bolts and nuts (fastening components) 43: Bolts and nuts (column fastening components) 44: Bolts and nuts (column fastening components) 51: Through hole for fixing the upper column 52: Through hole for fixing the lower column 71: Plate component (brace sheet) 72: Plate component (brace sheet)

Claims

1. A beam-to-beam joining structure in which the end of a second steel beam is butted against the side of a first steel beam, and these are joined perpendicularly to each other by a beam joining member, The beam joint member described above has a T-shaped configuration comprising a first plate portion facing the web of the first steel beam and fastened and fixed to the web by a fastening member, and a second plate portion facing the web of the second steel beam and fastened and fixed to the web by a fastening member. The upper flange of the first steel beam has multiple upper column fixing insertion holes formed on the extension of the web of the second steel beam, sandwiching the web of the first steel beam, through which column fastening members for fixing the upper column attached to the upper flange are inserted. A beam-to-beam joint structure characterized in that the lower flange of the first steel beam has multiple insertion holes for lower column fixing, through which a column fastening member for fixing the lower column attached below the lower flange is inserted, on the extension of the web of the second steel beam, sandwiching the web of the first steel beam.

2. The beam-to-beam joint structure according to claim 1, characterized in that the upper edge of the second plate portion of the beam joint member has a height position that receives the head of the column fastening member located below the upper column fixing insertion hole passed through from below and temporarily holds the column fastening member.

3. The beam-to-beam joint structure according to claim 1, characterized in that a recess is formed on the lower edge of the second plate portion of the beam joint member to avoid interference with the protruding portion of the column fastening member that is passed through the lower column fixing insertion hole.

4. The beam-to-beam joint structure according to claim 1, characterized in that the upper flange of the first steel beam has a plurality of additional upper column fixing insertion holes formed in it parallel to the line connecting the plurality of upper column fixing insertion holes, and the lower flange of the first steel beam has a plurality of additional lower column fixing insertion holes formed in it parallel to the line connecting the plurality of lower column fixing insertion holes.

5. The beam-to-beam joint structure according to claim 1, characterized in that, at the position on the height-direction center side of the beam joint member, plate members are horizontally welded and fixed to the second plate portion and the first plate portion on both sides of the second plate portion.

6. The beam-to-beam joint structure according to claim 5, characterized in that the plate member located on the side of the second steel beam that does not come into contact with the web extends on the second plate portion to a point where it intersects with the web of the second steel beam and is welded and fixed to the second plate portion.

7. The beam-to-beam joint structure according to claim 5 or claim 6, characterized in that the plate member is a brace sheet to which horizontal braces are connected.

8. A construction method for constructing a beam-to-beam joint structure as described in claim 2, characterized in that the beam joint member is positioned between the upper and lower flanges of the first steel beam, and when attaching the beam joint member to the web of the first steel beam by the fastening member, the column fastening member for fixing the upper column is inserted from below into the upper column fixing insertion hole of the upper flange of the first steel beam, and the column fastening member is temporarily held in place by the upper edge of the second plate portion of the beam joint member, which receives the head of the column fastening member located below it.

9. A construction method for constructing a beam-to-beam joint structure as described in claim 8, characterized in that the work of temporarily holding the column fastening member by receiving the head located below the column fastening member with the upper edge of the second plate portion of the beam joint member is performed before transporting the first steel beam to the site.

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