Composite beam, beam structure, and method for forming a composite beam

Abstract

To form a high strength girder with simple work.SOLUTION: A composite beam 8 comprises a first beam 1 having a pair of first flanges 11 and a first web 13, a second beam 2 having a pair of second flanges 21 and a second web 23, and connection parts 3 that are connected with the first beam 1 and the second beam 2 with them parallel attitude to each other. The connection part 3 includes a first connection plate 41 attached to the first web 13 and a second connection plate 42 attached to the second web 23. Parts 415, 425 of each of the first connection plate 41 and the second connection plate 42 are overlapped to each other, and those parts 415, 425 are joined with bolts to each other.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to a composite beam, a beam structure, and a method for forming a composite beam.

Background Art

[0002] Patent Document 1 and the like disclose that for a main beam made of H-shaped steel, the ends of the secondary beams of H-shaped steel orthogonal to the main beam are joined to form a beam structure.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the above technology, as a measure for reducing the deflection of the secondary beam, it is conceivable to increase the strength of the main beam. To increase the strength of the main beam, for example, it is also conceivable to form the main beam by arranging and welding two H-shaped steels. However, when forming the main beam in this way, the welding work on site is time-consuming.

[0005] An object of the present disclosure is to form a high-strength main beam with simple operations.

Means for Solving the Problems

[0006] The composite beam according to one aspect of the present disclosure includes a first beam, a second beam, and a connecting portion. The first beam is made of an H-shaped steel having a pair of first flanges and a first web connecting the pair of first flanges. The second beam is made of an H-shaped steel having a pair of second flanges and a second web connecting the pair of second flanges. The connecting portion connects the first beam and the second beam in a parallel posture with each other. The connecting portion includes a first connection plate joined to the first web and a second connection plate joined to the second web. The first connection plate and the second connection plate are configured such that a part of each of them overlaps with each other and the overlapping parts are bolted together.

[0007] The beam structure according to one aspect of the present disclosure includes the composite beam and a small beam joined to the predetermined portion.

[0008] The method for forming a composite beam according to one aspect of the present disclosure is a method for forming the composite beam, which includes arranging the first beam joined with the first connection plate and the second beam joined with the second connection plate, overlapping a part of the first connection plate and a part of the second connection plate, and bolt-joining the overlapping parts of the first connection plate and the second connection plate through a space between the pair of first flanges of the first beam and the pair of second flanges of the second beam.

Advantages of the Invention

[0009] The present disclosure has an effect that a high-strength large beam can be formed by simple operations.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Figure 3

Figure 4

Embodiment for Carrying Out the Invention

[0011] (1) Embodiment (1-1) Beam Structure Figs. 1 and 3 show a beam structure 9 configured using a composite beam 8 of an embodiment. This beam structure 9 includes a composite beam 8 that functions as a main beam, a secondary beam 52 joined to a predetermined portion 81 of the composite beam 8, joint members 50 respectively connected to both ends of the composite beam 8, and a beam member 51 connected to the joint member 50 so as to be parallel to the secondary beam 52. The secondary beam 52 is joined so as to be orthogonal to the composite beam 8.

[0012] In the beam structure 9 of an embodiment, a plurality of secondary beams 52 are arranged in parallel, and two beam members 51 are arranged on both sides sandwiching these plurality of secondary beams 52. One of the two beam members 51 is connected to a joint member 50 connected to the first end in the length direction D1 of the composite beam 8. The other of the two beam members 51 is connected to another joint member 50 connected to the second end in the length direction D1 of the composite beam 8.

[0013] The predetermined portion 81 of the composite beam 8 is provided at a plurality of locations (specifically, two locations) spaced apart in the length direction D1 of the composite beam 8. The plurality of secondary beams 52 (specifically, two secondary beams 52) are respectively connected to one corresponding predetermined portion 81 among the plurality of predetermined portions 81. In other words, the plurality of secondary beams 52 are connected one-to-one to the plurality of predetermined portions 81.

[0014] (1-2) Composite Beam As shown in Figs. 1 and 2, the composite beam 8 includes a first beam 1 made of an H-shaped steel, a second beam 2 also made of an H-shaped steel, and a plurality of connecting portions 3 (specifically, four connecting portions 3) for firmly connecting the first beam 1 and the second beam 2. The first beam 1 and the second beam 2 are positioned parallel to each other.

[0015] Here, the composite beam 8 has a longitudinal direction D1, a width direction D2, and a height direction D3 that are perpendicular to each other. The longitudinal direction D1 of the composite beam 8 is the same as the longitudinal direction D1 of the first beam 1 and the second beam 2. The width direction D2 of the composite beam 8 is the same as the width direction D2 of the first beam 1 and the second beam 2. The height direction D3 of the composite beam 8 is the same as the height direction D3 of the first beam 1 and the second beam 2.

[0016] Both ends of the first beam 1 in the longitudinal direction D1 are respectively joined to the joint member 50. In contrast, both ends of the second beam 2 in the longitudinal direction D2 are not joined to the joint member 50 respectively, but are joined to the side surface of the beam member 51 connected to the joint member 50. In other words, both ends of the first beam 1 are directly connected to the joint member 50 respectively, and both ends of the second beam 2 are indirectly connected to the joint member 50 respectively via the beam member 51.

[0017] (1-3) First beam The first beam 1 has a pair of first flanges 11 and a first web 13 that connects the pair of first flanges 11 to each other.

[0018] The pair of first flanges 11 are positioned parallel to each other at a distance in the height direction D3. The pair of first flanges 11 is composed of an upper first flange 11 (hereinafter referred to as reference numeral 11a) having a long plate-like outer shape extending in the longitudinal direction D1 and a lower first flange 11 (hereinafter referred to as reference numeral 11b) having the same long plate-like outer shape extending in the longitudinal direction D1. It is preferable that the upper first flange 11a and the lower first flange 11b are of the same shape and size as each other, but this is not a limitation.

[0019] The first web 13 is a web that connects the middle portion in the width direction D2 of the upper first flange 11a and the middle portion in the width direction D2 of the lower first flange 11b, and has a long plate-like outer shape extending in the longitudinal direction D1. The upper edge of the first web 13 is integrally joined to the middle portion in the width direction D2 of the upper first flange 11a, and the lower edge of the first web 13 is integrally joined to the middle portion in the width direction D2 of the lower first flange 11b.

[0020] (1-4) Second beam The second beam 2 is made of an H-shaped steel having the same shape and size as the first beam 1. Specifically, it has a pair of second flanges 21 and a second web 23 connecting the pair of second flanges to each other.

[0021] The pair of second flanges 21 are positioned parallel to each other with a distance in the height direction D3. The pair of second flanges 21 are composed of an upper second flange 21 (hereinafter denoted by reference numeral 21a) having a long plate-like outer shape extending in the length direction D1 and a lower second flange 21 (hereinafter denoted by reference numeral 21b) having the same long plate-like outer shape extending in the length direction D1. The upper second flange 21a and the lower second flange 21b are of the same shape and size as each other, but this is not the limit.

[0022] The second web 23 is a web connecting the middle portion in the width direction D2 of the upper second flange 21a and the middle portion in the width direction D2 of the lower second flange 21b, and has a long plate-like outer shape extending in the length direction D1. The upper edge of the second web 23 is integrally joined to the middle portion in the width direction D2 of the upper second flange 21a, and the lower edge of the second web 23 is integrally joined to the middle portion in the width direction D2 of the lower second flange 21b.

[0023] (1-5) Connection part The four connection parts 3 are positioned at a distance in the length direction D1 of the composite beam 8. These four connection parts 3 are configured to connect the first beam 1 and the second beam 2 in a parallel posture to each other.

[0024] The four connection parts 3 have a common structure. Hereinafter, the common structure of the connection part 3 will be described.

[0025] The connection part 3 includes a first connection plate 41 in the shape of a rectangular flat plate joined to the first beam 1 and a second connection plate 42 in the shape of a rectangular flat plate joined to the second beam 2.

[0026] The first connection plate 41 and the second connection plate 42 are configured such that a part 415 of one overlaps a part 425 of the other, and the parts 415 and 425 are bolted together (see Fig. 2).

[0027] The first connection plate 41 has straight edge portions 411 and 412 on both sides in the width direction D2, and one edge portion 411 is joined to the side surface of the first web 13.

[0028] A part 415 of the first connection plate 41 that overlaps the second connection plate 42 is composed of a half portion in the width direction D2 of the first connection plate 41. This half portion is the part including the edge portion 412.

[0029] A part 415 of the first connection plate 41 is preferably composed of a part within the range of, for example, 30% to 70% of the first connection plate 41, or a part within the range of 40% to 60% of the first connection plate 41. More specifically, the length of a part 415 of the first connection plate 41 in the width direction D2 is configured to be within the range of 30% to 70% of the length of the entire first connection plate 41 in the width direction D2, or within the range of 40% to 60% of the length of the entire first connection plate 41 in the width direction D2.

[0030] A part 415 of the first connection plate 41 is a rectangular part long in the height direction D3, and a plurality of bolt holes 417 are provided in this part 415. The plurality of bolt holes 417 are four bolt holes 417 arranged in a row with a distance in the height direction D3.

[0031] The first connection plate 41 is joined to each of the first web 13 and the pair of first flanges 11 by welding.

[0032] The edge portion 411 of the first connection plate 41 is welded to the side surface of the first web 13. Further, a half portion 4135 of the upper edge portion 413 of the first connection plate 41, which is closer to the edge portion 411, is welded to the lower surface of the upper first flange 11a. A half portion 4145 of the lower edge portion 414 of the first connection plate 41, which is closer to the edge portion 411, is welded to the upper surface of the lower first flange 11b. The welding portion between the first connection plate 41 and the first beam 1 has an overall U-shaped outer profile.

[0033] The second connection plate 42 has the same structure as the first connection plate 41. That is, the second connection plate 42 has linear edge portions 421 and 422 on both sides in the width direction D2, and one edge portion 421 is joined to the side surface of the second web 23.

[0034] A part 425 of the second connection plate 42 that overlaps with the first connection plate 41 is composed of a half portion in the width direction D2 of the second connection plate 42. This half portion is the part including the edge portion 422.

[0035] A part 425 of the second connection plate 42 is preferably composed of a part within the range of, for example, 30% to 70% of the second connection plate 42, or a part within the range of 40% to 60% of the second connection plate 42. More specifically, the length of a part 425 of the second connection plate 42 in the width direction D2 is configured to be within the range of 30% to 70% of the length of the second connection plate 42 as a whole in the width direction D2, or within the range of 40% to 60% of the length of the second connection plate 42 as a whole in the width direction D2.

[0036] A part 425 of the second connection plate 42 is a rectangular portion that is long in the height direction D3, and a plurality of bolt holes 427 are provided in this part 425. The plurality of bolt holes 427 are four bolt holes 427 arranged in a row at intervals in the height direction D3. The four bolt holes 427 correspond one-to-one to the four bolt holes 417 provided in the first connection plate 41.

[0037] The second connection plate 42 is joined to each of the second web 23 and the pair of second flanges 21 by welding.

[0038] The edge portion 421 of the second connection plate 42 is welded to the side surface of the second web 23. The half portion 4235 of the upper edge portion 423 of the second connection plate 42, which is closer to the edge portion 421, is welded to the lower surface of the upper second flange 21a. The half portion 4245 of the lower edge portion 424 of the second connection plate 42, which is closer to the edge portion 421, is welded to the upper surface of the lower second flange 21b. The welding locations between the second connection plate 42 and the second beam 2 have an overall U-shaped outer contour.

[0039] The four connection parts 3 having the above common structure are composed of two first connection parts 31 and two second connection parts 32 (see FIG. 1).

[0040] The first connection part 31 is provided at each of two predetermined portions 81 of the composite beam 8 to which the small beam 52 is joined. The two first connection parts 31 are positioned at a predetermined distance d4 from each other in the longitudinal direction D1. At each predetermined portion 81, the small beam 52 joined to the predetermined portion 81 and the first connection part 31 provided at the predetermined portion 81 are positioned side by side in the width direction D2.

[0041] The second connection part 32 is provided at each of both ends of the composite beam 8. A distance d3 is provided in the longitudinal direction D1 between each second connection part 32 and the end 89 of both ends 89 of the composite beam 8 that is closer to the second connection part 32. A distance d5 is provided in the longitudinal direction D1 between each second connection part 32 and the closest first connection part 31 among the plurality of first connection parts 31. The distance d5 is larger than the predetermined distance d4.

[0042] The distance d3 is smaller than the predetermined distance d4 between two adjacent first connection parts 31 and is specifically 150 mm. The distance d3 is preferably 1 / 20 or less of the total length L of the composite beam 8 in the longitudinal direction D1.

[0043] The position of the second connecting portion 32 is preferably closer to the end 89 of the composite beam 8 in terms of the strength of the entire beam. However, considering on-site construction and other circumstances, the distance d3 is preferably 50 mm or more, and more preferably 100 mm or more.

[0044] (1-6) Positional relationship among the first beam, the second beam, and the connecting portion In the composite beam 8 (that is, in a state where the first beam 1 and the second beam 2 are integrated via a plurality of connecting portions 3), a pair of first flanges 11 of the first beam 1 and a pair of second flanges 21 of the second beam 2 are positioned at a distance in the direction in which the first beam 1 and the second beam 2 are arranged (that is, the width direction D2 of the composite beam 8) (see Fig. 2B).

[0045] Specifically, the upper first flange 11a of the first beam 1 and the upper second flange 21a of the second beam 2 are positioned at a distance d1 in the width direction D2. Also, the lower first flange 11b of the first beam 1 and the lower second flange 21b of the second beam 2 are positioned at a distance d2 in the width direction D2.

[0046] In the composite beam 8 of one embodiment, the distance d1 and the distance d2 are the same, but they may also be different. When the distance d1 and the distance d2 are different, the longer one of the distance d1 and the distance d2 is defined as the distance between the pair of first flanges 11 of the first beam 1 and the pair of second flanges 21 of the second beam 2.

[0047] In the composite beam 8 of one embodiment, the distance between the pair of first flanges 11 and the pair of second flanges 21 is 50 mm (that is, both the distance d1 and the distance d2 are 50 mm). However, it is not limited thereto. As an example, it is preferably a distance within the range of 30 mm to 80 mm, or more preferably a distance within the range of 40 mm to 60 mm.

[0048] A space 7a is formed between the upper first flange 11a of the first beam 1 and the upper second flange 21a of the second beam 2, and a partially overlapping portion 415, 425 of the first connection plate 41 and the second connection plate 42 is positioned directly below this space 7a.

[0049] Also, a space 7b is formed between the first flange 11b on the lower side of the first beam 1 and the second flange 21b on the lower side of the second beam 2, and a part 415, 425 where the first connection plate 41 and the second connection plate 42 overlap each other is located directly above this space 7b.

[0050] These spaces 7a, 7b can be used in the operation of bolt - joining the small beams 52 to the side surface of the composite beam 8, and can also be used in the operation of bolt - joining the composite beam 8 and the joint member 50. That is, by inserting tools or the like inside the composite beam 8 through these spaces 7a, 7b, the bolt - joining of the small beams 52 and the joint member 50 can be performed.

[0051] (1 - 7) Method for forming a composite beam A method for forming the composite beam 8 of one embodiment includes a first joining step, a parallel - arranging step, and a second joining step.

[0052] In the first joining step, four first connection plates 41 are joined to the first beam 1 by welding respectively. Specifically, the edge portion 411 of the first connection plate 41 is welded to the side surface of the first web 13, half of the upper edge portion 413 (4135) of the first connection plate 41 is welded to the lower surface of the upper first flange 11a, and half of the lower edge portion 414 (4145) of the first connection plate 41 is welded to the upper surface of the lower first flange 11b.

[0053] Furthermore, in the first joining step, four second connection plates 42 are joined to the second beam 2 by welding respectively. Specifically, the edge portion 421 of the second connection plate 42 is welded to the side surface of the second web 23, half of the upper edge portion 423 (4235) of the second connection plate 42 is welded to the lower surface of the upper second flange 21a, and half of the lower edge portion 424 (4245) of the second connection plate 42 is welded to the upper surface of the lower second flange 21b.

[0054] In the juxtaposition process, the first beam 1 to which four first connection plates 41 are joined as described above and the second beam 2 to which four second connection plates 42 are joined are arranged in a parallel posture to each other. Then, the first beam 1 and the second beam 2 are set such that a part 415, 425 of each first connection plate 41 and the corresponding second connection plate 42 overlap in the length direction D1.

[0055] In the second joining process, a tool or the like is inserted through the space 7 between the pair of first flanges 11 of the first beam 1 and the pair of second flanges 21 of the second beam 2, and a part 415, 425 of each first connection plate 41 and the corresponding second connection plate 42 are bolted together. The space 7 here includes the upper space 7a and the lower space 7b described above.

[0056] In the second joining process, a part 415, 425 of the first connection plate 41 and the second connection plate 42 are bolted together through both or one of the upper space 7a and the lower space 7b. Specifically, four bolt holes 417 provided in a part 415 of the first connection plate 41 and four bolt holes 427 provided in a part 425 of the second connection plate 42 communicate with each other one-to-one in the length direction D1, and bolts 6 are inserted into the communicating bolt holes 417, 427 to fasten the first connection plate 41 and the second connection plate 42.

[0057] Through the above-described first joining process, juxtaposition process, and second joining process, a composite beam 8 of one embodiment is formed. For example, it is possible to perform the first joining process at a factory and the juxtaposition process and the second joining process at a construction site, or it is also possible to perform the first joining process, the juxtaposition process, and the second joining process at a factory.

[0058] (2) Modification The composite beam 8 of one embodiment has four connection parts 3 for convenience, but the number of connection parts 3 is not limited to this, and the number of connection parts 3 may be one or more.

[0059] In addition, in the composite beam 8 of one embodiment, although the connecting portion 3 includes two first connecting portions 31, the number of the first connecting portions 31 is not limited to this, and the number of the first connecting portions 31 may be one or more. In other words, the number of the predetermined portions 81 where the small beams 52 are joined in the composite beam 8 may be one or more.

[0060] When the number of the first connecting portions 31 is three or more, it is preferable that the three or more first connecting portions 31 are positioned at equal intervals, but it is not limited to this. In other words, when the number of the predetermined portions 81 of the composite beam 8 is three or more, it is preferable that the three or more predetermined portions 81 are positioned at equal intervals, but it is not limited to this.

[0061] In addition, in the composite beam 8 of one embodiment, it is preferable that the distance d3 between the end 89 of the composite beam 8 and the second connecting portion 32 is set to 1 / 20 or less of the total length L in the length direction D1 of the composite beam 8, but it is also possible to set it to a distance exceeding 1 / 20 of the total length L (see FIG. 4). In the composite beam 8 of one embodiment, the distances d3 between the second connecting portions 32 and the end 89 at both ends are the same as each other, but it is not limited to this, and it is also possible to make the distances d3 between the second connecting portions 32 and the end 89 at both ends different from each other.

[0062] In addition, as a result of the inventors creating a model and performing structural calculations, even when the beam structure 9 is configured using the composite beam 8 of one embodiment, by setting the distance d3 to 1 / 20 or less of the total length L of the composite beam 8, it has been confirmed that the deflection of the entire beam structure 9 under the same conditions is reduced. Further, as in the modified example shown in FIG. 4, rather than arranging the plurality of connecting portions 3 evenly in the length direction D1 of the composite beam 8, as in the one embodiment shown in FIG. 3, when the connecting portions 3 at both ends among the plurality of connecting portions 3 are arranged closer to the end 89, it has been confirmed that the deflection of the entire beam structure 9 under the same conditions is reduced.

[0063] (3) Aspect As is clear from the above embodiments and modified examples, the present disclosure includes the following aspects. Hereinafter, for the sole purpose of clarifying the correspondence with the embodiments, reference numerals are attached in parentheses.

[0064] The composite beam (8) according to the first aspect comprises a first beam (1) made of an H-shaped steel having a pair of first flanges (11) and a first web (13) connecting the pair of first flanges (11), a second beam (2) made of an H-shaped steel having a pair of second flanges (21) and a second web (23) connecting the pair of second flanges (21), and a connecting portion (3) that connects the first beam (1) and the second beam (2) in a parallel posture with each other. The connecting portion (3) includes a first connecting plate (41) joined to the first web (13) and a second connecting plate (42) joined to the second web (23). The first connecting plate (41) and the second connecting plate (42) are configured such that a part (415, 425) of each other overlaps and a part (415, 425) of each other is bolted together.

[0065] According to the composite beam (8) according to the first aspect, by preparing the first beam (1) to which the first connecting plate (41) is joined and the second beam (2) to which the second connecting plate (42) is joined, and bolt-joining the first connecting plate (41) and the second connecting plate (42), a high-strength composite beam (8) that functions as a large beam can be obtained. Therefore, it is possible to form a high-strength large beam by a simple operation.

[0066] In the composite beam (8) according to the second aspect, in the first aspect, the pair of first flanges (11) of the first beam (1) and the pair of second flanges (21) of the second beam (2) are positioned at a distance in the direction in which the first beam (1) and the second beam (2) are arranged.

[0067] According to the composite beam (8) according to the second aspect, through the space (7) between the pair of first flanges (11) and the pair of second flanges (21), the bolt connection work between the first connecting plate (41) and the second connecting plate (42) can be performed. Therefore, it is possible to form a high-strength large beam by a simple operation.

[0068] In the composite beam (8) according to the third aspect, in the first or second aspect, the first connecting plate (41) is welded to each of the first web (13) and the pair of first flanges (11).

[0069] According to the composite beam (8) according to the third aspect, the strength of the entire composite beam (8) is further enhanced.

[0070] In the composite beam (8) according to the fourth aspect, in any one of the first to third aspects, the second connection plate (42) is welded to each of the second web (23) and the pair of second flanges (21).

[0071] According to the composite beam (8) according to the fourth aspect, the strength of the entire composite beam (8) is further enhanced.

[0072] The composite beam (8) according to the fifth aspect includes, in any one of the first to fourth aspects, a plurality of connection portions (3) spaced apart in the longitudinal direction (D1) of the composite beam (8). The plurality of connection portions (3) include at least one first connection portion (31) provided at a predetermined portion (81) where the secondary beam (52) is joined in the composite beam (8), and two second connection portions (32) provided at both ends of the composite beam (8).

[0073] According to the composite beam (8) according to the fifth aspect, since it includes the first connection portion (31) that effectively reinforces the predetermined portion (81) where the secondary beam (52) is joined and the second connection portion (32) that effectively reinforces both ends of the composite beam (8), the strength of the entire composite beam (8) is further enhanced.

[0074] In the composite beam (8) according to the sixth aspect, in the fifth aspect, the distance (d3) between each second connection portion (32) and the nearer end (89) of both ends (89) of the composite beam (8) is 1 / 20 or less of the total length (L) in the longitudinal direction (D1) of the composite beam (8).

[0075] According to the composite beam (8) according to the sixth aspect, it is possible to effectively reinforce both ends of the composite beam (8) and further enhance the strength of the entire composite beam (8).

[0076] The beam structure (9) according to the seventh aspect includes the composite beam (8) according to the fifth or sixth aspect and the secondary beam (52) joined to the predetermined portion (81).

[0077] According to the beam structure (9) according to the seventh aspect, it is possible to form a high-strength main beam with simple operations, and thus, it is possible to form a high-strength beam structure (9) with simple operations.

[0078] The method for forming the composite beam (8) according to the eighth aspect is a method for forming the composite beam (8) according to any one of the first to sixth aspects, including arranging the first beam (1) joined with the first connection plate (41) and the second beam (2) joined with the second connection plate (42), overlapping a part (415, 425) of the first connection plate (41) and the second connection plate (42), and bolt-joining the part (415, 425) of the first connection plate (41) and the second connection plate (42) through the space (7) between the pair of first flanges (11) of the first beam (1) and the pair of second flanges (21) of the second beam (2).

[0079] According to the method for forming the composite beam (8) according to the eighth aspect, it is possible to form a high-strength composite beam (8) functioning as a main beam with simple operations.

Explanation of Signs

[0080] 1 First beam 2 Second beam 3 Connection part 7 Space 8 Composite beam 9 Beam structure 11 First flange 13 First web 21 Second flange 23 Second web 31 First connection part 32 Second connection part 41 First connection plate 42 Second connection plate 52 Small beam 81 Predetermined part 415 Part 425 Part d3 Distance D1 Longitudinal direction L Overall length

Claims

1. A first beam made of an H-shaped steel having a pair of first flanges and a first web connecting the pair of first flanges, A composite beam including a second beam made of an H-shaped steel having a pair of second flanges and a second web connecting the pair of second flanges, The composite beam further includes a plurality of connecting portions provided at a distance in the longitudinal direction of the composite beam so as to connect the first beam and the second beam in a parallel posture with each other, Each of the plurality of connecting portions includes a first connecting plate joined to the first web and a second connecting plate joined to the second web, The first connecting plate and the second connecting plate are configured such that a part of each other overlaps and the parts are bolted together, The plurality of connecting portions are, At least one first connecting portion provided at a predetermined portion where a small beam is joined in the composite beam, Including two second connecting portions provided at both ends of the composite beam, Composite beam.

2. The pair of first flanges of the first beam and the pair of second flanges of the second beam are positioned at a distance in the direction in which the first beam and the second beam are arranged, The composite beam according to Claim 1.

3. The first connecting plate is welded to each of the first web and the pair of first flanges, The composite beam according to Claim 1 or 2.

4. The second connecting plate is welded to each of the second web and the pair of second flanges, The composite beam according to any one of Claims 1 to 3.

5. The distance between each second connecting portion and the nearer end of both ends of the composite beam is 1 / 20 or less of the total length of the composite beam in the longitudinal direction, The composite beam according to any one of Claims 1 to 4.

6. A composite beam according to any one of Claims 1 to 5, and A small beam joined to the predetermined portion, Beam structure.

7. A method of forming a composite beam according to any one of Claims 1 to 5, comprising: Arranging the first beam joined with the first connecting plate and the second beam joined with the second connecting plate, Overlapping a part of the first connecting plate and the second connecting plate, Bolt-joining the parts of the first connecting plate and the second connecting plate through a space between the pair of first flanges of the first beam and the pair of second flanges of the second beam, Method of forming a composite beam.

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