Beam joint structure and beam joint method

Abstract

To simplify a jointing process for lower flanges of small beams in a beam joint structure that joins the small beams to a girder.SOLUTION: The present invention relates to a beam joint structure including a girder with an H-shaped section and a pair of small beams with H-shaped sections and crossly arranged to the girder and face each other, in which lower flanges of the pair of small beams are jointed to each other through open holes formed at a web of the girder.SELECTED DRAWING: Figure 1A

Description

[Technical Field]

[0001] The present invention relates to a beam joining structure and a beam joining method. [Background technology]

[0002] In a beam connection structure in which a secondary beam is connected to a main beam, the lower flanges of the secondary beams, which are arranged perpendicular to the main beam and face each other, are bolted to a joint member welded to the web of the main beam, as in the techniques described in Patent Documents 1, 2 and 3, for example. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6753043 [Patent Document 2] Patent No. 6347930 [Patent Document 3] Patent No. 6266269 Summary of the Invention [Problem to be solved by the invention]

[0004] In the conventional beam joint structure described above, the upper flange and web of the sub-beam are also joined to the main beam to form a rigid or semi-rigid joint, so the cross section of the sub-beam can be made smaller than in the case of a pin joint, for example, in which only the web of the sub-beam is bolted to a gusset plate welded to the main beam.

[0005] However, while the top flange of a sub-beam is generally positioned at the same height as the top flange of the main girder, making it relatively easy to join it with bolts or indirectly via a floor slab, the bottom flange requires the alignment and welding of the joint members as described above, which requires a lot of processing and management effort, resulting in increased costs.For this reason, despite the advantages mentioned above, the joining of the bottom flange of a sub-beam is a bottleneck, preventing the spread of rigid and semi-rigid joints.

[0006] Therefore, an object of the present invention is to provide a beam joining structure and a beam joining method that enable the joining process of the lower flange of a sub-beam to be simplified in a beam joining structure in which a sub-beam is joined to a main beam. [Means for solving the problem]

[0007] [1] A beam joint structure including a main girder having an H-shaped cross section and a pair of secondary beams also having an H-shaped cross section and arranged opposite each other across the main girder, in which the lower flanges of the pair of secondary beams are joined to each other through through holes formed in the web of the main girder. [2] A beam joint structure as described in [1], further comprising joining members joined to the lower flanges of each of the pair of sub-beams and inserted into the through holes, wherein the lower flanges of the pair of sub-beams are joined to each other via the joining members. [3] A beam connection structure as described in [2], in which the connection member is bolted or welded to either or both of the upper and lower surfaces of the lower flanges of a pair of sub-beams. [4] A beam joint structure according to [2] or [3], wherein the joint member is a steel plate, a structural steel, a flat steel, a steel pipe or a reinforcing bar. [5] A beam joint structure described in any one of [1] to [4], further comprising another joint member joined to each of the upper flanges of the pair of sub-beams, and the upper flanges of the pair of sub-beams are joined to each other via another joint member. [6] A beam joint structure described in any one of [1] to [5], further comprising a floor slab arranged above the main beam and the pair of secondary beams, and locking members joined to the upper flanges of the pair of secondary beams, respectively, and fixed to the concrete constituting the floor slab, wherein the upper flanges of the pair of secondary beams are joined to each other via the locking members and the floor slab. [7] A beam joining method for joining a main girder having an H-shaped cross section and a pair of secondary beams having an H-shaped cross section and arranged crosswise to the main girder so as to face each other, the beam joining method comprising the steps of inserting a joining member into a through hole formed in the web of the main girder, and joining the joining member to each of the lower flanges of the pair of secondary beams, thereby joining the lower flanges of the pair of secondary beams to each other via the joining member. [Effects of the Invention]

[0008] With the above configuration, the bottom flanges of a pair of sub-girders are joined together through the through-holes formed in the web of the main girder, thereby achieving the same rigidity as when the bottom flanges of a pair of sub-girders are joined to the main girder individually. At the same time, the process can be simplified by eliminating the need for processes such as aligning and welding parts such as joint members to join the bottom flanges of a pair of sub-girders to the main girder. [Brief explanation of the drawings]

[0009] [Figure 1A] 1 is a diagram showing a beam joint structure according to a first embodiment of the present invention. [Figure 1B] 1 is a diagram showing a beam joint structure according to a first embodiment of the present invention. [Figure 2A] FIG. 10 is a diagram showing a beam joint structure according to a second embodiment of the present invention. [Figure 2B] FIG. 10 is a diagram showing a beam joint structure according to a second embodiment of the present invention. [Figure 3A] FIG. 10 is a diagram showing a beam joint structure according to a third embodiment of the present invention. [Figure 3B] FIG. 10 is a diagram showing a beam joint structure according to a third embodiment of the present invention. [Figure 4A] FIG. 10 is a diagram showing a beam joint structure according to a fourth embodiment of the present invention. [Figure 4B] FIG. 10 is a diagram showing a beam joint structure according to a fourth embodiment of the present invention. [Figure 5A] 10A and 10B are diagrams showing a first modified example of a method for joining an upper flange in an embodiment of the present invention. [Figure 5B] 10A and 10B are diagrams showing a first modified example of a method for joining an upper flange in an embodiment of the present invention. [Figure 6A] FIG. 10 is a diagram showing a second modified example of a method for joining an upper flange in an embodiment of the present invention. [Figure 6B] FIG. 10 is a diagram showing a second modified example of a method for joining an upper flange in an embodiment of the present invention. [Figure 7A] FIG. 10 is a diagram showing a third modified example of a method for joining an upper flange in an embodiment of the present invention. [Figure 7B] FIG. 10 is a diagram showing a third modified example of a method for joining an upper flange in an embodiment of the present invention. [Figure 8A] FIG. 10 is a diagram showing a first modified example of a through hole in the embodiment of the present invention. [Figure 8B] FIG. 10 is a diagram showing a first modified example of a through hole in the embodiment of the present invention. [Figure 9A] FIG. 10 is a diagram showing a second modified example of a through hole in the embodiment of the present invention. [Figure 9B] FIG. 10 is a diagram showing a second modified example of a through hole in the embodiment of the present invention. [Figure 10A] 10A and 10B are diagrams illustrating modified examples of the joining of the joining member and the gusset plate in the embodiment of the present invention. [Figure 10B] 10A and 10B are diagrams illustrating modified examples of the joining of the joining member and the gusset plate in the embodiment of the present invention. [Figure 11A] 10A and 10B are diagrams illustrating modified examples of the joining of the joining member and the gusset plate in the embodiment of the present invention. [Figure 11B] 10A and 10B are diagrams illustrating modified examples of the joining of the joining member and the gusset plate in the embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In this specification and drawings, components having substantially the same functional configurations are designated by the same reference numerals, and redundant description will be omitted.

[0011] (First embodiment) 1A and 1B are cross-sectional views taken along lines AA and BB, respectively, showing a beam joint structure according to a first embodiment of the present invention. The joint structure according to the first embodiment includes a pair of sub-beams 1A and 1B having an H-shaped cross section, each including upper flanges 11A and 11B, lower flanges 12A and 12B, and webs 13A and 13B, and a main beam 2 having an H-shaped cross section, each including an upper flange 21, a lower flange 22, and a web 23. The sub-beams 1A and 1B are arranged crosswise to the main beam 2 and face each other. In the illustrated example, the material axes of the sub-beams 1A and 1B arranged on both sides of the main beam 2 are substantially aligned, and these material axes are perpendicular to the material axis direction of the main beam 2. Note that the material axes of the sub-beams 1A and 1B do not necessarily have to be perpendicular to the material axis direction of the main beam 2, but may be oblique.

[0012] In this embodiment, a through hole 24 is formed in the web 23 of the main girder 2, and the lower flanges 12A, 12B of the sub-girders 1A, 1B are joined to each other via connecting members 41A, 41B inserted through the through hole 24. The connecting members 41A, 41B are spliced ​​onto the upper and lower surfaces of the lower flanges 12A, 12B, respectively, and are joined to the lower flanges 12A, 12B using bolts 42A, 42B. As shown in FIG. 1B , the connecting members 41A, 41B have a divided shape to avoid interference with the webs 13A, 13B and gusset plates 31 of the sub-girders 1A, 1B. The shape of the connecting members 41A, 41B is not particularly limited as long as they can be joined to the upper or lower surfaces of the lower flanges 12A, 12B. Specifically, the connecting members 41A, 41B may be steel plates as shown in the example, or may be shaped steel such as angle iron or channel iron, or flat steel.

[0013] Here, the lower flanges 12A, 12B and connecting members 41A, 41B of the sub-beams 1A, 1B are not directly connected to the web 23 and lower flange 22 of the main girder 2.

[0014] Meanwhile, the webs 13A, 13B of the sub-beams 1A, 1B are joined by bolts 32 to gusset plates 31 that are joined to the web 23 of the girder 2. The upper flanges 11A, 11B of the sub-beams 1A, 1B are joined to each other via joining members 43 that pass above the upper flange 21 of the girder 2. The joining members 43 are joined to the upper flanges 11A, 11B by bolts 44A, 44B. Note that various known techniques can be used to join these upper flanges 11A, 11B and webs 13A, 13B, including examples of other embodiments described later.

[0015] In the first embodiment of the present invention as described above, the bottom flanges 12A, 12B of the sub-girders 1A, 1B are joined to each other through the through holes 24 formed in the webs 23 of the girder 2, thereby obtaining rigidity similar to that obtained when the bottom flanges 12A, 12B are each joined to the girder 2. On the other hand, since processes such as alignment and welding of members such as joint members for joining the bottom flanges 12A, 12B are not required, the process can be simplified compared to when the bottom flanges 12A, 12B are each joined to the girder 2.

[0016] More specifically, the through holes 24 can be formed relatively easily using an automatic processing machine during intermediate processing of the girder 2, simplifying the process compared to, for example, processing or welding of joint members. Furthermore, joint members are often larger than the gusset plates 31 and protrude from the girder 2. Therefore, when transporting girder members to which joint members have already been joined at a factory, the large external dimensions of the members result in a low loading rate. In contrast, in this embodiment, no joint members are provided, so the external dimensions of the members are small, increasing the loading rate when transporting the girder 2 to which the gusset plates 31 and other members have already been joined, thereby improving the efficiency of transportation.

[0017] In addition, in the above-described first embodiment, the lower flanges 12A, 12B of the joists 1A, 1B are joined using joining members 41A, 41B by double shear (two-sided friction joining), so the number of bolts 42A, 42B joining the joining members 41A, 41B to the lower flanges 12A, 12B can be reduced compared to when joining by single shear (one-sided friction joining).

[0018] (Second embodiment) 2A and 2B are cross-sectional views of a beam joint structure according to a second embodiment of the present invention, taken along lines AA and BB, respectively. The difference from the first embodiment is that in this embodiment, the lower flanges 12A and 12B of the sub-beams 1A and 1B are joined to each other using a joining member 41 joined to the upper surfaces of the lower flanges 12A and 12B. Other than this, the configuration of this embodiment is similar to that of the first embodiment, and therefore a detailed description thereof will be omitted.

[0019] The connecting member 41 is spliced ​​onto the upper surfaces of the lower flanges 12A and 12B and joined to the lower flanges 12A and 12B using bolts 42A and 42B. As shown in FIG. 2B , the connecting member 41 has a divided shape to avoid interference with the webs 13A and 13B of the joists 1A and 1B and the gusset plate 31. The shape of the connecting member 41 is not particularly limited as long as it can be joined to the upper surfaces of the lower flanges 12A and 12B. Specifically, the connecting member 41 may be a steel plate as shown in the illustrated example, or may be a steel beam such as an angle iron or a channel iron, or flat steel. Although the connecting member 41 is joined to the upper surfaces of the lower flanges 12A and 12B in the illustrated example, the connecting member 41 may also be joined to the lower surfaces of the lower flanges 12A and 12B.

[0020] In the second embodiment of the present invention as described above, the joining process of the lower flanges 12A, 12B of the joists 1A, 1B can be simplified as in the first embodiment. In addition, in this embodiment, the lower flanges 12A, 12B are joined by single shear (single-face friction joining) using the joining member 41, so while the number of bolts 42A, 42B is increased, the number of joining members is half that of the first embodiment.

[0021] (Third embodiment) 3A and 3B are cross-sectional views taken along lines AA and BB, respectively, showing a beam joint structure according to a third embodiment of the present invention. The difference from the first embodiment is that in this embodiment, the gusset plate 33 is short and does not reach the bottom flange 22 of the main beam 2, and the bottom flanges 12A and 12B of the sub-beams 1A and 1B are joined to each other using joining members 41A and 41C joined to the upper and lower surfaces of the bottom flanges 12A and 12B, respectively. Other than this, the configuration of this embodiment is similar to that of the first embodiment, and therefore a detailed description thereof will be omitted.

[0022] The connecting members 41A and 41C are spliced ​​to the upper and lower surfaces of the lower flanges 12A and 12B, respectively, and are joined to the lower flanges 12A and 12B using bolts 42A and 42B. As shown in FIG. 3B , the connecting member 41A has a divided shape to avoid interference with the webs 13A and 13B of the joists 1A and 1B and the gusset plate 33. However, in this embodiment, the gusset plate 33 is short, so the connecting member 41C is not divided. The shape of the connecting member 41C is not particularly limited as long as it can be joined to the lower surfaces of the lower flanges 12A and 12B. Specifically, the connecting member 41C may be a steel plate, as in the illustrated example, or may be a shaped steel or flat steel, such as an angle iron or a channel iron.

[0023] In the third embodiment of the present invention as described above, the joining process of the lower flanges 12A, 12B of the joists 1A, 1B can be simplified, as in the first embodiment. Additionally, in this embodiment, by shortening the gusset plate 33, the joining member 41C that constitutes one of the double shears (two-sided friction joint) does not interfere with the gusset plate 33, and therefore the joining member 41C can be made into a single, undivided member. This reduces the number of components. In another example, a single shear (one-sided friction joint) can also be configured, in which only the joining member 41C is used and no joining member 41A is used.

[0024] (Fourth embodiment) 4A and 4B are cross-sectional views taken along lines AA and BB, respectively, showing a beam joint structure according to a fourth embodiment of the present invention. The difference from the second embodiment is that in this embodiment, joint member 41 is joined to lower flanges 12A and 12B of sub-beams 1A and 1B by fillet welds 45A and 45B. Joint member 43, which joins upper flanges 11A and 11B to each other, is also joined to upper flanges 11A and 11B by fillet welds 46A and 46B. Other than this, the configuration of this embodiment is similar to that of the second embodiment, and therefore a detailed description thereof will be omitted.

[0025] In this embodiment, fillet welds 45A and 45B are used to join the lower flanges 12A and 12B to the joining member 41. Similarly, in other embodiments, welding may be used instead of bolting between the lower flanges 12A and 12B and the joining member 41. Furthermore, welding may be used instead of bolting between the upper flanges 11A and 11B and the joining member 43. The joining between the lower flanges 12A and 12B and the joining member 41 and the joining between the upper flanges 11A and 11B and the joining member 43 do not necessarily have to be performed by the same method. For example, the joining member 41 may be joined to the lower flanges 12A and 12B by fillet welds 45A and 45B, while the joining member 43 may be joined to the upper flanges 11A and 11B by bolts. Conversely, the joining member 43 may be joined to the upper flanges 11A and 11B by fillet welds 46A and 46B, while the joining member 41 may be joined to the lower flanges 12A and 12B by bolts.

[0026] In the fourth embodiment of the present invention described above, the bottom flanges 12A, 12B of the sub-beams 1A, 1B are joined to the connecting member 41 by fillet welds 45A, 45B rather than bolts. However, this does not require a joint member to join the bottom flanges 12A, 12B, and therefore simplifies the joining process for the bottom flanges 12A, 12B, as in the first embodiment. While this embodiment requires a welding process, it does not require bolts. Furthermore, welding the bottom flanges 12A, 12B to the connecting member allows the use of, for example, steel pipes or reinforcing bars as the connecting member.

[0027] The following describes modified examples of the present invention. These modified examples are based on any of the first to fourth embodiments, but are also applicable to other embodiments.

[0028] (Modifications regarding the upper flange) 5A and 5B are cross-sectional views taken along lines AA and BB, respectively, illustrating a first modified example of a method for joining upper flanges in an embodiment of the present invention. In the illustrated example, the upper flanges 11A and 11B of the sub-beams 1A and 1B are joined to each other via joining members 43A and 43B. The joining member 43A is attached to the upper surfaces of the upper flanges 11A and 11B and passes above the upper flange 21 of the girder 2. Meanwhile, the joining member 43B is attached to the lower surfaces of the upper flanges 11A and 11B via a filler plate 47 and is inserted through a through-hole 25 formed in the web 23 near the lower surface of the upper flange 21 of the girder 2. Because the upper flange 21 of the girder 2 is thicker than the upper flanges 11A and 11B of the sub-beams 1A and 1B, a filler plate 47 may be inserted between the joining member 43B and the upper flanges 11A and 11B to compensate for the difference in thickness. In this modification, the upper flanges 11A, 11B of the sub-beams 1A, 1B are joined by double shear (two-face friction joining), so that the number of bolts 44A, 44B can be reduced.

[0029] 6A and 6B are cross-sectional views taken along lines AA and BB, respectively, illustrating a second modification of the method for joining upper flanges in the embodiment of the present invention. In the illustrated example, the upper flanges 11A and 11B of the sub-girders 1A and 1B are joined to each other via joining members 43A, 43C, and 43D and the upper flange 21 of the girder 2. The joining members 43C and 43D are respectively attached to the lower surfaces of the upper flanges 11A and 11B via filler plates 47 and are also attached to the lower surface of the upper flange 21 of the girder 2. The joining members 43A, 43C, and 43D are joined to the upper flanges 11A and 11B of the sub-girders 1A and 1B using bolts 44A and 44B, respectively, and are also joined to the upper flange 21 of the girder 2 using bolt 44C. In this modification, the upper flanges 11A and 11B of the sub-girders 1A and 1B can be joined by double shear (two-face friction welding) without forming a through-hole in the web 23 of the girder 2.

[0030] 7A and 7B are cross-sectional views taken along lines AA and BB, respectively, illustrating a third modified example of a method for joining upper flanges in an embodiment of the present invention. In the illustrated example, upper flanges 11A and 11B of sub-joints 1A and 1B are joined to each other via a floor slab 5. More specifically, the floor slab 5 is a reinforced concrete slab disposed above the girder 2 and sub-joints 1A and 1B, and includes concrete 51 and reinforcing bars 52 and 53. Stud bolts 6, which serve as anchoring members, are joined to the upper flanges 11A and 11B of the sub-joints 1A and 1B, and the stud bolts 6 are anchored in the concrete 51. This allows stress to be transmitted between the upper flanges 11A and 11B via the floor slab 5. Note that, although the floor slab 5 is a reinforced concrete slab in the illustrated example, the upper flanges 11A and 11B can also be joined to each other via a floor slab, such as a composite deck slab. In the illustrated example, the fastening member is a stud bolt 6, but it is also possible to use other fastening members such as perforated steel plate dowels to fasten the fastening members to the concrete 51.

[0031] (Modifications regarding through holes) 8A and 8B are cross-sectional views of a first modification of the through-holes in the embodiment of the present invention, taken along lines AA and BB, respectively. In the illustrated example, through-holes 26, through which joining members 41A and 41B that join lower flanges 12A and 12B of sub-beams 1A and 1B are inserted, are formed larger than the cross-sections of the joining members 41A and 41B, and piping 7 is inserted through through-holes 26 together with joining members 41A and 41B. Although through-holes for arranging piping 7 are sometimes formed in webs 23 of girder 2, integrating the function of these through-holes into through-holes 26 for inserting joining members 41A and 41B reduces the number of through-holes formed in webs 23, simplifies the intermediate processing of girder 2, and reduces cross-sectional loss of girder 2.

[0032] 9A and 9B are cross-sectional views taken along lines AA and BB, respectively, illustrating a second modified example of a through hole in an embodiment of the present invention. In the illustrated example, similar to the first modified example, a through hole 26 through which joining members 41A and 41B and a pipe 7 are inserted is formed in the web 23 of the girder 2. Furthermore, in this modified example, a reinforcing plate 8 is joined to the area surrounding the through hole 26 in the web 23. In many cases, the loss of cross section of the girder 2 due to the formation of the through hole 26 is not a problem in terms of the strength required of the web 23, but if necessary, the strength of the web 23 may be supplemented by joining a reinforcing plate 8, as in this modified example.

[0033] (Modifications regarding the joining of the joining member and the gusset plate) 10A and 10B, and 11A and 11B are cross-sectional views taken along lines AA and BB, showing modified examples of the joining of a joining member and a gusset plate according to an embodiment of the present invention. In the example shown in FIGS. 10A and 10B, a joining member 41 is joined to the gusset plate 31 using a temporary receiving member 48. In the example shown in FIGS. 11A and 11B, the joining member 41 is joined to the gusset plate 31 by a fillet weld 49.

[0034] In the embodiment of the present invention described above, the bottom flanges 12A, 12B of the sub-beams 1A, 1B are joined to each other via the joining members 41 inserted through the through holes. Stress acting on the ends of the bottom flanges 12A, 12B of the sub-beams 1A, 1B is transmitted to the opposing sub-beams, balancing the forces and eliminating stress burden on the main beam 2. Therefore, from the perspective of load transmission in the beam-joining structure, the joining members 41 do not need to be joined to the gusset plate 31 or the web 23 of the main beam 2. However, joining the joining members 41 to the gusset plate 31 or the web 23 using the temporary support members 48 and fillet welds 49, as exemplified above, for temporary fastening until the joining members 41 are bolted or welded to the bottom flanges 12A, 12B, for example, is not excluded. Even in this case, the joining using the temporary support members 48 and fillet welds 49 is simple and only requires temporary fastening, so the advantage of simplifying the joining process of the bottom flanges 12A, 12B is not diminished.

[0035] Although the preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, the present invention is not limited to these examples. It is clear that a person skilled in the art to which the present invention pertains can conceive of various modifications or alterations within the scope of the technical ideas described in the claims, and it is understood that these also naturally fall within the technical scope of the present invention. [Explanation of symbols]

[0036] 1A, 1B...sub-beam, 11A, 11B...upper flange, 12A, 12B...lower flange, 13A, 13B...web, 2...main beam, 21...upper flange, 22...lower flange, 23...web, 24, 25, 26...through hole, 31, 33...gusset plate, 32...bolt, 41, 41A, 41B, 41C, 43, 43A, 43B, 43C, 43D...connecting member, 42A, 42B, 44A, 44B, 44C...bolt, 45A, 45B, 46A, 46B...fillet weld, 47...filler plate, 48...temporary support member, 49...fillet weld, 5...floor slab, 51...concrete, 52...reinforcing bar, 53...reinforcing bar, 6...stud bolt, 7...piping, 8...reinforcing plate.

Claims

1. A girder having an H-shaped cross section; A pair of small beams each having an H-shaped cross section and arranged to cross the main beam and face each other; A first joint member is attached to an upper surface of each of the lower flanges of the pair of small beams and inserted into a first through hole formed in the web of the main beam; a second joint member that is attached to the lower surface of each of the lower flanges of the pair of small beams and is inserted into the first through hole; Including, A beam joint structure in which the lower flanges of the pair of sub-beams are joined to each other via the first and second joint members.

2. A beam joint structure as described in claim 1, wherein the first and second joining members are joined to the respective lower flanges of the pair of sub-beams using bolts.

3. The beam joint structure according to claim 1 or 2, wherein the joint member is a steel plate, a steel section, or a flat steel.

4. Further, another joint member is joined to each of the upper flanges of the pair of small beams, The beam joint structure according to claim 1 , wherein the upper flanges of the pair of sub-beams are joined to each other via the separate joint member.

5. A beam joining structure as described in claim 4, wherein the other joining members include a third joining member attached to the upper surface of each upper flange of the pair of sub-beams, and a fourth joining member attached to the lower surface of each upper flange of the pair of sub-beams.

6. A beam joint structure as described in Claim 5, wherein the fourth joint member is inserted into a second through hole formed in the web of the main beam.

7. A floor slab disposed above the girder and the pair of minor beams; a locking member that is joined to each of the upper flanges of the pair of small beams and fixed to the concrete that constitutes the floor slab; Further equipped with The beam joint structure according to any one of claims 1 to 3, wherein the upper flanges of the pair of sub-beams are joined to each other via the locking member and the floor slab.

8. A beam joining method for joining a main beam having an H-shaped cross section to a pair of minor beams having H-shaped cross sections and disposed crosswise to the main beam and facing each other, comprising: Inserting first and second joining members through first through holes formed in the webs of the girder; a step of joining the lower flanges of the pair of sub-beams to each other via the first and second joining members by attaching the first joining member to an upper surface of each of the lower flanges of the pair of sub-beams and attaching the second joining member to a lower surface of each of the lower flanges of the pair of sub-beams; A beam joining method comprising:

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