JP7698565B2 - Composite beam, beam frame, and method for forming composite beams - Google Patents

Description

This disclosure relates to composite beams, beam structures, and methods for forming composite beams.

Patent Document 1 and other publications disclose how to construct a beam structure by joining the ends of a sub-beam made of H-shaped steel that is perpendicular to a main girder made of H-shaped steel.

Japanese Patent Application Publication No. 10-131289

In the above technology, one possible way to reduce the deflection of the sub-beam is to increase the strength of the main girder. To increase the strength of the main girder, for example, it is possible to form a main girder by welding two H-shaped steel beams side by side. However, when forming a main girder in this way, the welding work on site is time-consuming.

The purpose of this disclosure is to form high-strength girders with simple work.

A composite beam according to one embodiment of the present disclosure includes a first beam, a second beam, and a connection 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 connection portion connects the first beam and the second beam in a parallel position. The connection 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 portions of each plate overlap and are bolted together.

The beam structure according to one aspect of the present disclosure comprises the composite beam and a sub-beam joined to the specified portion.

A method for forming a composite beam according to one aspect of the present disclosure is a method for forming the composite beam, which comprises arranging the first beam to which the first connection plate is joined and the second beam to which the second connection plate is joined, overlapping portions of the first connection plate and the second connection plate, and bolting the portions of the first connection plate and the second connection plate together through the space between the pair of first flanges of the first beam and the pair of second flanges of the second beam.

This disclosure has the effect of making it possible to form high-strength girders with simple work.

FIG. 1 is a perspective view showing a main part of a beam frame constructed using a composite beam according to one embodiment of the present invention. FIG. 2A is a schematic diagram showing a process for forming the composite beam, and FIG. 2B is a schematic diagram showing the formed composite beam. FIG. 3 is a schematic plan view of the beam frame of the above embodiment. FIG. 4 is a schematic plan view of a modified example of the beam frame of the above embodiment.

(1) Embodiment (1-1) Beam Frame Figures 1 and 3 show a beam frame 9 constructed using a composite beam 8 of one embodiment. This beam frame 9 includes a composite beam 8 that functions as a main beam, a minor beam 52 joined to a predetermined portion 81 of the composite beam 8, joint members 50 connected to both ends of the composite beam 8, and a beam material 51 connected to the joint member 50 so as to be aligned in parallel with the minor beam 52. The minor beam 52 is joined so as to be perpendicular to the composite beam 8.

In one embodiment of the beam structure 9, multiple small beams 52 are arranged in parallel, and two beams 51 are positioned side by side on either side of the multiple small beams 52. One of the two beams 51 is connected to a joint member 50 that is connected to a first end of the composite beam 8 in the longitudinal direction D1. The other of the two beams 51 is connected to another joint member 50 that is connected to a second end of the composite beam 8 in the longitudinal direction D1.

The specified portions 81 of the composite beam 8 are provided at multiple locations (specifically, two locations) spaced apart in the longitudinal direction D1 of the composite beam 8. Each of the multiple small beams 52 (specifically, two small beams 52) is connected to a corresponding one of the multiple specified portions 81. In other words, the multiple small beams 52 are connected one-to-one to the multiple specified portions 81.

(1-2) Composite Beam As shown in Figures 1 and 2, the composite beam 8 includes a first beam 1 made of H-shaped steel, a second beam 2 also made of H-shaped steel, and a plurality of connection parts 3 (specifically, four connection parts 3) that firmly connect the first beam 1 and the second beam 2. The first beam 1 and the second beam 2 are positioned parallel to each other.

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

Both ends of the first beam 1 in the longitudinal direction D1 are each joined to a 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, but are joined to the side of a beam material 51 connected to the joint member 50. In other words, both ends of the first beam 1 are each directly connected to the joint member 50, and both ends of the second beam 2 are each indirectly connected to the joint member 50 via the beam material 51.

(1-3) First Beam The first beam 1 has a pair of first flanges 11 and a first web 13 connecting the pair of first flanges 11 to each other.

The pair of first flanges 11 are positioned parallel to each other with a distance in the height direction D3. The pair of first flanges 11 are composed of an upper first flange 11 (hereinafter, designated 11a) having a long plate-like outer shape extending in the length direction D1, and a lower first flange 11 (hereinafter, designated 11b) having a long plate-like outer shape also extending in the length direction D1. It is preferable that the upper first flange 11a and the lower first flange 11b have the same shape and size, but this is not limited to the above.

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

(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, and specifically has a pair of second flanges 21 and a second web 23 connecting the pair of second flanges.

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, designated by reference numeral 21a) having a long plate-like outer shape extending in the length direction D1, and a lower second flange 21 (hereinafter, designated by reference numeral 21b) having a long plate-like outer shape also extending in the length direction D1. The upper second flange 21a and the lower second flange 21b have the same shape and size, but this is not limited to the above.

The second web 23 is a web that connects the middle portion of the upper second flange 21a in the width direction D2 with the middle portion of the lower second flange 21b in the width direction D2, 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 of the upper second flange 21a in the width direction D2, and the lower edge of the second web 23 is integrally joined to the middle portion of the lower second flange 21b in the width direction D2.

(1-5) Connections The four connection parts 3 are positioned at intervals in the longitudinal 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.

The four connection parts 3 have a common structure. The common structure of the connection parts 3 is described below.

The connection portion 3 includes a first connection plate 41 having a rectangular flat shape joined to the first beam 1, and a second connection plate 42 having a rectangular flat shape joined to the second beam 2.

The first connecting plate 41 and the second connecting plate 42 are configured so that portions 415, 425 of the first connecting plate 41 and the second connecting plate 42 overlap each other and are bolted together (see FIG. 2).

The first connecting plate 41 has linear edge portions 411, 412 on both sides in the width direction D2, and one edge portion 411 is joined to the side of the first web 13.

The portion 415 of the first connection plate 41 that overlaps with the second connection plate 42 is composed of half of the first connection plate 41 in the width direction D2. This half includes the edge portion 412.

The portion 415 of the first connection plate 41 is preferably configured to be within a range of 30% to 70% of the first connection plate 41, or within a range of 40% to 60% of the first connection plate 41. More specifically, it is preferable that the length in the width direction D2 of the portion 415 of the first connection plate 41 is configured to be within a range of 30% to 70% of the length in the width direction D2 of the entire first connection plate 41, or within a range of 40% to 60% of the length in the width direction D2 of the entire first connection plate 41.

The portion 415 of the first connection plate 41 is a rectangular portion that is long in the height direction D3, and this portion 415 is provided with a plurality of bolt holes 417. The plurality of bolt holes 417 are four bolt holes 417 that are arranged in a row at a distance in the height direction D3.

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

The edge 411 of the first connecting plate 41 is welded to the side of the first web 13. In addition, the half 4135 of the upper edge 413 of the first connecting plate 41 that is closer to the edge 411 is welded to the underside of the upper first flange 11a. The half 4145 of the lower edge 414 of the first connecting plate 41 that is closer to the edge 411 is welded to the upper surface of the lower first flange 11b. The welded portion between the first connecting plate 41 and the first beam 1 has an overall U-shaped outer shape.

The second connection plate 42 has a structure similar to that of the first connection plate 41. In other words, the second connection plate 42 has linear edge portions 421, 422 on both sides in the width direction D2, and the edge portion 421 on one side is joined to the side surface of the second web 23.

The portion 425 of the second connection plate 42 that overlaps with the first connection plate 41 is composed of half of the second connection plate 42 in the width direction D2. This half includes the edge portion 422.

The portion 425 of the second connection plate 42 is preferably configured to be within a range of 30% to 70% of the second connection plate 42, or within a range of 40% to 60% of the second connection plate 42. More specifically, it is preferable that the length of the width direction D2 of the portion 425 of the second connection plate 42 is configured to be within a range of 30% to 70% of the length of the entire second connection plate 42 in the width direction D2, or within a range of 40% to 60% of the length of the entire second connection plate 42 in the width direction D2.

The portion 425 of the second connection plate 42 is a rectangular portion that is long in the height direction D3, and this portion 425 is provided with a plurality of bolt holes 427. The plurality of bolt holes 427 are four bolt holes 427 that are arranged in a row at a distance 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.

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

The edge 421 of the second connection plate 42 is welded to the side of the second web 23. The half 4235 of the upper edge 423 of the second connection plate 42 that is closer to the edge 421 is welded to the underside of the upper second flange 21a. The half 4245 of the lower edge 424 of the second connection plate 42 that is closer to the edge 421 is welded to the upper surface of the lower second flange 21b. The welded portion between the second connection plate 42 and the second beam 2 has an overall U-shaped outer shape.

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 Figure 1).

The first connection portion 31 is provided at each of two specified portions 81 of the composite beam 8 to which the sub-beams 52 are joined. The two first connection portions 31 are positioned at a specified distance d4 from each other in the longitudinal direction D1. In each specified portion 81, the sub-beam 52 joined to that specified portion 81 and the first connection portion 31 provided at that specified portion 81 are positioned side by side in the width direction D2.

The second connection portion 32 is provided at each end of the composite beam 8. A distance d3 is provided in the length direction D1 between each second connection portion 32 and the end 89 of the composite beam 8 that is closer to the second connection portion 32. A distance d5 is provided in the length direction D1 between each second connection portion 32 and the closest first connection portion 31 of the multiple first connection portions 31. The distance d5 is greater than the predetermined distance d4.

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

The closer the position of the second connection part 32 is to the end 89 of the composite beam 8, the better in terms of the strength of the entire beam. However, taking into account the convenience of on-site construction, etc., it is preferable that the distance d3 is 50 mm or more, or 100 mm or more.

(1-6) Positional relationship between the first beam, second beam, and connection parts In the composite beam 8 (i.e., when the first beam 1 and the second beam 2 are integrated via multiple connection parts 3), 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 aligned (i.e., the width direction D2 of the composite beam 8) (see Figure 2B).

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 apart 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 apart in the width direction D2.

In one embodiment of the composite beam 8, the distance d1 and the distance d2 are the same, but they may differ. When the distances d1 and d2 are different, the longer of the distances d1 and d2 is set 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.

In one embodiment of the composite beam 8, the distance between the pair of first flanges 11 and the pair of second flanges 21 is 50 mm (i.e., distance d1 and distance d2 are both 50 mm), but this is not limited thereto, and it is preferable that the distance is within a range of 30 mm to 80 mm, or within a range of 40 mm to 60 mm, for example.

A space 7a is formed between the first flange 11a on the upper side of the first beam 1 and the second flange 21a on the upper side of the second beam 2, and overlapping portions 415, 425 of the first connecting plate 41 and the second connecting plate 42 are located directly below this space 7a.

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 overlapping portions 415, 425 of the first connecting plate 41 and the second connecting plate 42 are located directly above this space 7b.

These spaces 7a and 7b can be used when bolting the sub-beam 52 to the side of the composite beam 8, and can also be used when bolting the composite beam 8 to the joint member 50. In other words, by inserting a tool or the like into the inside of the composite beam 8 through these spaces 7a and 7b, the sub-beam 52 and the joint member 50 can be bolted.

(1-7) Method for Forming Composite Beam A method for forming the composite beam 8 of one embodiment includes a first joining step, a juxtaposition step, and a second joining step.

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

Furthermore, in the first joining process, the four second connection plates 42 are each joined to the second beam 2 by welding. Specifically, the end edge 421 of the second connection plate 42 is welded to the side of the second web 23, a half 4235 of the upper end edge 423 of the second connection plate 42 is welded to the underside of the upper second flange 21a, and a half 4245 of the lower end edge 424 of the second connection plate 42 is welded to the upper surface of the lower second flange 21b.

In the parallel installation process, the first beam 1 to which the four first connection plates 41 are joined as described above and the second beam 2 to which the four second connection plates 42 are joined are aligned in a parallel posture. Then, the first beam 1 and the second beam 2 are set so that each first connection plate 41 and the corresponding part 415, 425 of the second connection plate 42 overlap in the longitudinal direction D1.

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 each first connection plate 41 and the corresponding part 415, 425 of the second connection plate 42 are bolted together. The space 7 here includes the upper space 7a and the lower space 7b described above.

In the second joining step, the first connecting plate 41 and the second connecting plate 42 are joined together with bolts through both or either of the upper space 7a and the lower space 7b. Specifically, the four bolt holes 417 in the first connecting plate 41 and the four bolt holes 427 in the second connecting plate 42 are connected in a one-to-one relationship in the longitudinal direction D1, and bolts 6 are inserted into the connected bolt holes 417, 427 to fasten the first connecting plate 41 and the second connecting plate 42.

The composite beam 8 of one embodiment is formed through the above-mentioned first joining process, juxtaposition process, and second joining process. For example, the first joining process can be performed in a factory, and the juxtaposition process and second joining process can be performed at the construction site, or the first joining process, juxtaposition process, and second joining process can be performed in a factory.

(2) Modifications Although the composite beam 8 in one embodiment has a total of four connecting portions 3, the number of connecting portions 3 is not limited to this, and the number of connecting portions 3 may be one or more.

In addition, in one embodiment of the composite beam 8, the connection portion 3 includes two first connection portions 31, but the number of first connection portions 31 is not limited to this, and the number of first connection portions 31 may be one or more. In other words, the number of predetermined portions 81 to which the sub-beams 52 of the composite beam 8 are joined may be one or more.

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

In one embodiment of the composite beam 8, the distance d3 between the end 89 of the composite beam 8 and the second connection portion 32 is preferably set to 1/20 or less of the total length L of the composite beam 8 in the longitudinal direction D1, but it is also possible to set it to a distance exceeding 1/20 of the total length L (see FIG. 4). In one embodiment of the composite beam 8, the distance d3 between the second connection portion 32 and the end 89 at both ends is the same, but this is not limited thereto, and the distance d3 between the second connection portion 32 and the end 89 at both ends can also be different from each other.

The inventors also created a model and performed structural calculations, and confirmed that when a beam structure 9 is constructed using the composite beam 8 of one embodiment, the deflection of the entire beam structure 9 under the same conditions is reduced by setting the distance d3 to 1/20 or less of the total length L of the composite beam 8. In addition, it has been confirmed that the deflection of the entire beam structure 9 under the same conditions is reduced when the connection parts 3 at both ends of the multiple connection parts 3 are arranged closer to the ends 89, as in the embodiment shown in Figure 3, than when the multiple connection parts 3 are arranged evenly in the longitudinal direction D1 of the composite beam 8, as in the modified example shown in Figure 4.

(3) Aspects As is apparent from the above embodiment and modified examples, the present disclosure includes the following aspects. In the following, reference symbols are given in parentheses only to clarify the correspondence with the embodiment.

The composite beam (8) according to the first embodiment includes a first beam (1) made of 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 H-shaped steel having a pair of second flanges (21) and a second web (23) connecting the pair of second flanges (21), and a connection part (3) that connects the first beam (1) and the second beam (2) in a parallel posture. The connection part (3) includes a first connection plate (41) joined to the first web (13) and a second connection plate (42) joined to the second web (23). The first connection plate (41) and the second connection plate (42) are configured such that portions (415, 425) of each plate overlap with each other and portions (415, 425) of each plate are bolted to each other.

According to the composite beam (8) of the first aspect, a first beam (1) to which a first connection plate (41) is joined and a second beam (2) to which a second connection plate (42) is joined are prepared, and the first connection plate (41) and the second connection plate (42) are bolted together to obtain a high-strength composite beam (8) that functions as a main girder. Therefore, it is possible to form a high-strength main girder with simple work.

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 aligned.

According to the composite beam (8) of the second aspect, the first connecting plate (41) and the second connecting plate (42) can be bolted together through the space (7) between the pair of first flanges (11) and the pair of second flanges (21). Therefore, it is possible to form a high-strength girder with simple work.

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

The composite beam (8) according to the third aspect further increases the strength of the entire composite beam (8).

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

The composite beam (8) according to the fourth aspect further increases the strength of the entire composite beam (8).

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

The composite beam (8) according to the fifth aspect includes a first connection portion (31) that effectively reinforces a specific portion (81) where the sub-beam (52) is joined, and a second connection portion (32) that effectively reinforces both ends of the composite beam (8), thereby further increasing the strength of the entire composite beam (8).

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

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

The beam structure (9) of the seventh aspect comprises a composite beam (8) of the fifth or sixth aspect and a sub-beam (52) joined to a specified portion (81).

According to the beam structure (9) of the seventh aspect, it is possible to form a high-strength girder with simple work, and therefore to form a high-strength beam structure (9) with simple work.

The method for forming a composite beam (8) according to the eighth aspect is a method for forming a composite beam (8) according to any one of the first to sixth aspects, in which a first beam (1) to which a first connection plate (41) is joined and a second beam (2) to which a second connection plate (42) is joined are arranged side by side, parts (415, 425) of the first connection plate (41) and the second connection plate (42) are overlapped, and the parts (415, 425) of the first connection plate (41) and the second connection plate (42) are bolted together through the space (7) between a pair of first flanges (11) of the first beam (1) and a pair of second flanges (21) of the second beam (2).

According to the method for forming a composite beam (8) according to the eighth aspect, it is possible to form a high-strength composite beam (8) that functions as a main beam with simple work.

Reference Signs List 1 First beam 2 Second beam 3 Connection portion 7 Space 8 Composite beam 9 Beam frame 11 First flange 13 First web 21 Second flange 23 Second web 31 First connection portion 32 Second connection portion 41 First connection plate 42 Second connection plate 52 Sub-beam 81 Specified portion 415 Part 425 Part d3 Distance D1 Length direction L Total length

Claims (7)

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 first beam and the second beam are further provided with a plurality of connection portions provided at intervals in the longitudinal direction of the composite beam so as to connect the first beam and the second beam in a parallel posture to each other,
Each of the plurality of connection portions 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 portions of the first connection plate and the second connection plate overlap each other and are bolted together,
The plurality of connection portions include
At least one first connection portion provided at a predetermined portion of the composite beam to which the sub-beam is joined;
and two second connection parts provided at both ends of the composite beam.
Composite beam. The pair of first flanges of the first beam and the pair of second flanges of the second beam are positioned at a distance from each other in a direction in which the first beam and the second beam are aligned.
The composite beam of claim 1. the first connecting plate is welded to the first web and each of the pair of first flanges;
3. A composite beam according to claim 1 or 2. the second connecting plate is welded to the second web and each of the pair of second flanges;
A composite beam according to any one of claims 1 to 3. The distance between each second connection portion and the closer end of the composite beam is 1/20 or less of the total length of the composite beam in the longitudinal direction.
A composite beam according to any one of claims 1 to 4. A composite beam according to any one of claims 1 to 5;
A small beam joined to the predetermined portion.
Beam frame. 6. A method of forming a composite beam according to any one of claims 1 to 5, comprising the steps of:
The first beam to which the first connection plate is joined and the second beam to which the second connection plate is joined are aligned,
A portion of the first connection plate and a portion of the second connection plate are overlapped with each other,
The first connection plate and the second connection plate are bolted together through a space between the pair of first flanges of the first beam and the pair of second flanges of the second beam.
A method for forming a composite beam.

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