Frame structure and building including frame structure

Abstract

A framework structure (10) is a framework structure around a room in a building. The framework structure (10) comprises: a steel horizontal member (11); a first wooden horizontal member (21) orthogonal to the steel horizontal member (11); and first connection hardware (31) that connects the steel horizontal member (11) and the first wooden horizontal member (21). The steel horizontal member (11) is longer than the first wooden horizontal member (21).

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a frame structure and a building including the frame structure. BACKGROUND ART

[0002] Reference to background art herein is not to be construed as an admission that such art constitutes common general knowledge. A known frame structure includes wooden posts and steel horizontal members (for example, see Non-Patent Literature 1). In the technique described in the Non-Patent Literature 1, the steel horizontal members are arranged in parallel to form a large open space. CITATION LIST Patent Literature (Non-Patent Literature)

[0003] Non-Patent Literature 1:”TN-WOLSH Beam”, a homepage of Tatsumi Corporation, https: / / www.tatsumi-web.com / product / tn-wolsh-beam / (accessed May 2, 2024) SUMMARY OF INVENTION Technical Problem

[0004] However, the use of steel horizontal members to form a large open space may increase construction costs. Accordingly, it is an objective of the present disclosure to provide a frame structure and a building that form a large open space with a limited number of steel horizontal members. Solution to Problem

[0005] (1) A frame structure in accordance with one general aspect is arranged around a room inside a building. The frame structure includes a steel horizontal member, a first wooden horizontal member orthogonal to the steel horizontal member at an intermediate portion of the steel horizontal member, and a first metal bracket connecting the steel horizontal member and the first wooden horizontal member. The steel horizontal member is longer than the first wooden horizontal member. With this structure, the frame that covers an upper section of the large open space can be formed without arranging any posts in the room. Further, compared to when arranging more than one steel horizontal member in parallel, the large open space can be formed with a small number of the steel horizontal members. Thus, the number of the steel horizontal members can be reduced in the frame structure that covers the upper section of the large open space without arranging posts in the room.

[0006] (2) The frame structure according to (1), further includes two second wooden horizontal members arranged along a straight line in parallel to the steel horizontal member, an intermediate wooden post arranged between the two second wooden horizontal members, and a second metal bracket connecting the first wooden horizontal member and the intermediate wooden post. A length of the steel horizontal member is greater than a total length of the two second wooden horizontal members. With this structure, a large open space can be formed under the steel horizontal member.

[0007] (3) The frame structure according to (2), in which the first wooden horizontal member has two ends having a same end surface structure, and a connecting portion of the first metal bracket connected to the first wooden horizontal member is identical in structure to a connecting portion of the second metal bracket connected to the first wooden horizontal member.

[0008] With this structure, since the two ends of the first wooden horizontal member have the same end surface structure, compared to when the two ends of the first wooden horizontal member have different end surface structures, the first wooden horizontal member can be processed more efficiently.

[0009] (4) The frame structure according to (2) or (3), further includes a third wooden horizontal member orthogonal to the steel horizontal member and arranged at a side of the steel horizontal member opposite to the first wooden horizontal member, an additional steel horizontal member arranged in parallel to the steel horizontal member at a side of the steel horizontal member opposite to the second wooden horizontal member, a third metal bracket connecting the steel horizontal member and the third wooden horizontal member, and a fourth metal bracket connecting the additional steel horizontal member and the third wooden horizontal member. With this structure, a large open space can be formed under the steel horizontal member and the additional steel horizontal member.

[0010] (5) The frame structure according to (2) or (3), further includes a first wooden post supporting one end of the steel horizontal member, a second wooden post supporting another end of the steel horizontal member, a fourth wooden horizontal member arranged in parallel to the first wooden horizontal member and connected to the first wooden post, a fifth wooden horizontal member arranged in parallel to the first wooden horizontal member and connected to the second wooden post, a third wooden post supporting the fourth wooden horizontal member and one of the two second wooden horizontal members, and a fourth wooden post supporting the fifth wooden horizontal member and one of the two second wooden horizontal members. This structure uses the wooden posts and thus decreases the construction costs of the frame structure.

[0011] (6) The frame structure according to any one of (1) to (5), in which the steel horizontal member includes a stiffener. The first metal bracket includes a base portion, a fastening portion projecting from a first surface of the base portion and fastened to the stiffener, and a connecting portion connected to the first wooden horizontal member. The connecting portion includes an inserting portion inserted into a slot in an end surface of the first wooden horizontal member. With this structure, the first wooden horizontal member, which includes the slot, can be connected to the steel horizontal member by the first metal bracket.

[0012] (7) A building in accordance with another general aspect includes a room and a frame structure according to any one of (1) to (6) arranged around the room. With this structure, a large space can be formed with a limited number of steel horizontal members.

[0013] According to the present disclosure of the frame structure and the building, a large space can be formed with a limited number of steel horizontal members. BRIEF DESCRIPTION OF DRAWINGS

[0014] Fig. 1 is a schematic-view of a building. Fig. 2 is a plan view of a frame structure of an upper portion of a room. Fig. 3 is a plan view showing a portion where a steel horizontal member and a first wooden post are connected. Fig. 4 is a cross-sectional view of the frame structure taken along line 4-4 in Fig. 3. Fig. 5 is a plan view showing a portion where the steel horizontal member and a first wooden horizontal member are connected. Fig. 6 is a cross-sectional view of the frame structure taken along line 6-6 in Fig. 5. Fig. 7 is an exploded perspective view of the steel horizontal member and a first metal bracket. Fig. 8 is an exploded perspective view showing part of the frame structure. DESCRIPTION OF EMBODIMENTS

[0015] A building 1 and a frame structure 10 of the present embodiment will be described with reference to Figs. 1 to 8. Examples of the building 1 are a house, a community center, an office, a hospital, a public facility, a store or the like. As shown in Fig. 1, the building 1 includes a foundation 2 and a building body 3 that is arranged on the foundation 2. The building body 3 includes rooms 5. The building body 3 includes a structural body 4. The structural body 4 supports the building body 3. The structural body 4 includes frame members such as posts, horizontal members or the like.

[0016] In the present embodiment, the frame structure 10 around a room 5 in the building 1 will be described. The frame structure 10 is a part of the structural body 4. The frame structure 10 includes at least a frame of an upper section of the room 5. The upper section of the room 5 corresponds to the upper section of a room 5 in each story. More specifically, the frame structure 10 of the upper section of the room 5 corresponds to the frame structure 10 forming the floor of a second story or a higher story or corresponds to the frame structure 10 forming a ceiling underneath a roof 6.

[0017] In the present embodiment, the first story and the second story are defined as follows. In the building 1, the first story is closest to the ground. The second story is located above the first story. As shown in Fig. 2, the frame structure 10 includes a steel horizontal member 11, a first wooden horizontal member 21, and a first metal bracket 31. In one example, in a plan view, the steel horizontal member 11 is arranged to extend from a first wall 7 of the room 5 to a second wall 8 that faces the first wall 7. The first wooden horizontal member 21 intersects the steel horizontal member 11.

[0018] The frame structure 10 may also include two second wooden horizontal members 22, an intermediate wooden post 40 that is arranged between the two second wooden horizontal members 22, and a second metal bracket 32. The two second wooden horizontal members 22 and the intermediate wooden post 40 are arranged in a third wall 9. The third wall 9 connects the first wall 7 and the second wall 8.

[0019] The frame structure 10 may also include third wooden horizontal members 23, an additional steel horizontal member 12, third metal brackets 33, and fourth metal brackets 34. The third wooden horizontal members 23 and the first wooden horizontal member 21 are arranged at the opposite sides of the steel horizontal member 11. The third wooden horizontal members 23 intersect the steel horizontal member 11.

[0020] The frame structure 10 may also include posts that support the horizontal members. More specifically, the frame structure 10 may include a first wooden post 41, a second wooden post 42, a third wooden post 43, a fourth wooden post 44, fourth wooden horizontal members 24, and fifth wooden horizontal members 25.

[0021] The frame structure 10 may also include reinforcing members, namely, sixth wooden horizontal members 26 that have a small cross-sectional area. Examples of the sixth wooden horizontal members 26 include secondary beams that have rectangular cross sections and I-joists that have I-shaped cross sections.

[0022] Steel Horizontal Member As shown in Figs. 3 and 4, the steel horizontal member 11 includes a web 15, an upper flange 16 arranged on an upper end of the web 15, and a lower flange 17 arranged on a lower end of the web 15.

[0023] As shown in Figs. 5 and 6, the steel horizontal member 11 includes stiffeners 18. A stiffener 18 is arranged at an intermediate portion between the two ends of the steel horizontal member 11 in the longitudinal direction. The stiffener 18 is arranged in the steel horizontal member 11 at a portion that connects with the first wooden horizontal member 21. Stiffeners 18 are arranged in the steel horizontal member 11 at portions that connect with the third wooden horizontal members 23. The stiffeners 18 connected to the third wooden horizontal members 23 are arranged on the web 15 at the side opposite to the stiffener 18 connected to the first wooden horizontal member 21. In the longitudinal direction of the steel 2025205353   30 Jul 2026 horizontal member 11, the stiffeners 18 connected to the third wooden horizontal members 23 and the stiffener 18 connected to the first wooden horizontal member 21 may be arranged at the same location or separate locations.

[0024] Each stiffener 18 is a plate member that is orthogonal to the web 15, the upper flange 16, and the lower flange 17. Each stiffener 18 is arranged between the upper flange 16 and the lower flange 17. Moreover, each stiffener 18 is welded to the web 15, the upper flange 16, and the lower flange 17.

[0025] As shown in Fig. 2, the steel horizontal member 11 is supported by the first wooden post 41 and the second wooden post 42. One end of the steel horizontal member 11 is connected to a side surface of the first wooden post 41 by a fifth metal bracket 35. Another end of the steel horizontal member 11 is connected to a side surface of the second wooden post 42 by another fifth metal bracket 35. There are no posts supporting the section between the one end and the other end of the steel horizontal member 11. Thus, the room 5 formed under the steel horizontal member 11 is a large open space SA having no posts.

[0026] The length of the steel horizontal member 11 is greater than the length of the first wooden horizontal member 21. Further, the length of the steel horizontal member 11 is greater than the total length of the two second wooden horizontal members 22. Additional Steel Horizontal Member As shown in Fig. 2, the additional steel horizontal member 12 is arranged parallel to the steel horizontal member 11. The additional steel horizontal member 12 is arranged at the side of the steel horizontal member 11 opposite the second wooden horizontal members 22. The length of the additional steel horizontal member 12 is equal to the length of the steel horizontal member 11. The additional steel horizontal member 12 includes stiffeners 18. The stiffeners 18 are arranged on the additional steel horizontal member 12 at portions connected to the third wooden horizontal members 23. The additional steel horizontal member 12 substantially has the same structure as the steel horizontal member 11 except for the location of the stiffeners 18.

[0027] First Wooden Horizontal Member As shown in Fig. 2, the first wooden horizontal member 21 is orthogonal to the steel horizontal member 11 at the intermediate portion of the steel horizontal member 11. The intermediate portion of the steel horizontal member 11 refers to a portion between the two portions of the steel horizontal member 11 supported by the posts. More specifically, the intermediate portion of the steel horizontal member 11 refers to the portion between the portion of the steel horizontal member 11 supported by the first wooden post 41 and the portion of the steel horizontal member 11 supported by the second wooden post 42. In the present embodiment, a single first wooden horizontal member 21 is arranged orthogonal to the steel horizontal member 11.

[0028] One end of the first wooden horizontal member 21 is connected to the steel horizontal member 11 by the first metal bracket 31. The other end of the first wooden horizontal member 21 is connected to the intermediate wooden post 40 by the second metal bracket 32. As shown in Fig. 8, each end of the first wooden horizontal member 21 has the same end surface structure.

[0029] More specifically, one end of the first wooden horizontal member 21 includes two slots 27 corresponding to two inserting portions 31D of the first metal bracket 31. The other end of the first wooden horizontal member 21 includes two slots 27 corresponding to two inserting portions 32D of the second metal bracket 32. Further, the pitch between the two slots 27 is equal in the two ends of the first wooden horizontal member 21.

[0030] Second Wooden Horizontal Member As shown in Fig. 2, the second wooden horizontal members 22 are arranged parallel to the steel horizontal member 11. The two second wooden horizontal members 22 are arranged in a straight line. The second wooden horizontal members 22 are connected to the intermediate wooden post 40. More specifically, one of the second wooden horizontal members 22 is connected to a side surface of the intermediate wooden post 40 that is orthogonal to a side surface extending parallel to the steel horizontal member 11. The other second wooden horizontal member 22 is connected to another side surface of the intermediate wooden post 40 that is orthogonal to the side surface extending parallel to the steel horizontal member 11. In the present embodiment, the intermediate wooden post 40 and the second wooden horizontal members 22 form the frame of the third wall 9.

[0031] Third Wooden Horizontal Member As shown in Fig. 2, the third wooden horizontal members 23 are orthogonal to the steel horizontal member 11. In the frame structure 10, there is no limitation to the number of the third wooden horizontal members 23. In the present embodiment, the two third wooden horizontal members 23 are arranged orthogonal to the steel horizontal member 11.

[0032] Each third wooden horizontal member 23 and the first wooden horizontal member 21 are arranged at opposite sides of the steel horizontal member 11. Each third wooden horizontal member 23 is arranged between the steel horizontal member 11 and the additional steel horizontal member 12. One end of each third wooden horizontal member 23 is connected to the steel horizontal member 11 by the corresponding third metal bracket 33. The other end of each third wooden horizontal member 23 is connected to the additional steel horizontal member 12 by the corresponding fourth metal bracket 34. Each third wooden horizontal member 23 has substantially the same structure as the first wooden horizontal member 21. Each end of each third wooden horizontal member 23 has the same end surface structure. More specifically, each end of each third wooden horizontal member 23 has two slots 27. Further, the pitch between the two slots 27 is equal in the two ends of each third wooden horizontal member 23.

[0033] Fourth Wooden Horizontal Member As shown in Fig. 2, the fourth wooden horizontal members 24 are arranged along a line that lies on the first wooden post 41 and is orthogonal to a line extending along the steel horizontal member 11. The fourth wooden horizontal members 24 are each connected to one of two opposite side surfaces of the first wooden post 41. In the first wooden post 41, the two side surfaces connected to the fourth wooden horizontal members 24 are orthogonal to the side surface connected to the steel horizontal member 11.

[0034] One of the fourth wooden horizontal members 24 is arranged parallel to the first wooden horizontal member 21 and connects the first wooden post 41 and the third wooden post 43. The other fourth wooden horizontal member 24 is arranged parallel to the third wooden horizontal members 23.

[0035] In the present embodiment, the first wooden post 41 and the fourth wooden horizontal members 24 form a part of the frame of the first wall 7. The fourth wooden horizontal members 24 are each connected to the first wooden post 41 by a wood-to-wood metal bracket. An example of the wood-to-wood metal bracket is a metal bracket that has the same structure as the second metal bracket 32.

[0036] Fifth Wooden Horizontal Member As shown in Fig. 2, the fifth wooden horizontal members 25 are arranged along a line that lies on the second wooden post 42 and is orthogonal to a line extending along the steel horizontal member 11. The fifth wooden horizontal members 25 are each connected to one of two opposite side surfaces of the second wooden post 42. In the second wooden post 42, the two side surfaces connected to the fifth wooden horizontal members 25 are orthogonal to the side surface connected to the steel horizontal member 11.

[0037] One of the fifth wooden horizontal members 25 is arranged parallel to the first wooden horizontal member 21 and connects the second wooden post 42 and the fourth 2025205353   30 Jul 2026 wooden post 44. The other fifth wooden horizontal member 25 is arranged parallel to the third wooden horizontal members 23.

[0038] In the present embodiment, the second wooden post 42 and the fifth wooden horizontal members 25 form a part of the frame of the second wall 8. The fifth wooden horizontal members 25 are each connected to the second wooden post 42 by a wood-to-wood metal bracket. An example of a wood-to-wood metal bracket is a metal bracket that has the same structure as the second metal bracket 32.

[0039] Sixth Wooden Horizontal Member As shown in Fig. 2, the sixth wooden horizontal members 26 are arranged parallel to the steel horizontal member 11. Each sixth wooden horizontal member 26 is connected to other horizontal members by an L-shaped bracket. Some of the sixth wooden horizontal members 26 are arranged between one of the third wooden horizontal members 23 and the fourth wooden horizontal member 24 and connected to the third wooden horizontal member 23 and the fourth wooden horizontal member 24. Further sixth wooden horizontal members 26 are arranged between the other third wooden horizontal member 23 and the fifth wooden horizontal member 25 and connected to the third wooden horizontal member 23 and the fifth wooden horizontal member 25. Other sixth wooden horizontal members 26 are arranged between the two third wooden horizontal members 23 and connected to the two third wooden horizontal members 23.

[0040] First Metal Bracket As shown in Fig. 5, the first metal bracket 31 connects the steel horizontal member 11 and the first wooden horizontal member 21. As shown in Figs. 5 to 7, the first metal bracket 31 includes a base portion 31A, a fastening portion 31B, and a connecting portion 31C. In the description hereafter, a state in which the first metal bracket 31 is attached to the steel horizontal member 11 will be referred to as “the attached state of the first metal bracket 2025205353   30 Jul 2026 31.

[0041] The base portion 31A is a plate. The base portion 31A includes a first surface 31R and a second surface 31S at the opposite side of the first surface 31R. In the attached state of the first metal bracket 31, the base portion 31A is arranged parallel to the web 15 of the steel horizontal member 11.

[0042] The fastening portion 31B is a plate. The fastening portion 31B projects from the first surface 31R of the base portion 31A. In the attached state of the first metal bracket 31, the fastening portion 31B extends in the vertical direction and is arranged parallel to the corresponding stiffener 18 of the steel horizontal member 11. The fastening portion 31B includes fastening holes for insertion of fastening members. The fastening portion 31B is fastened to the stiffener 18 by fastening members such as bolts and nuts (refer to Fig. 7).

[0043] The connecting portion 31C is connected to the first wooden horizontal member 21. The connecting portion 31C includes the two inserting portions 31D. The inserting portions 31D are plates. The inserting portions 31D project from the second surface 31S of the base portion 31A. In the attached state of the first metal bracket 31, the inserting portions 31D extend in the vertical direction. The inserting portions 31D are inserted into the slots 27, which are arranged in the end surface of the first wooden horizontal member 21.

[0044] The connecting portion 31C of the first metal bracket 31 connected to the first wooden horizontal member 21 has the same structure as a connecting portion 32C of the second metal bracket 32 connected to the first wooden horizontal member 21. More specifically, the pitch of the two inserting portions 31D of the first metal bracket 31 is equal to the pitch of the two inserting portions 32D of the second metal bracket 32.

[0045] As shown in Fig. 6, the length of the base portion 31A in the vertical direction is substantially equal to the length of the stiffener 18. The length of the fastening portion 31B in the vertical direction is slightly less than the length of the stiffener 18. The length of each inserting portion 31D in the vertical direction is greater than the length of the stiffener 18.

[0046] Second Metal Bracket As shown in Fig. 8, the second metal bracket 32 connects the first wooden horizontal member 21 and the intermediate wooden post 40. The second metal bracket 32 includes a base portion 32A and the connecting portion 32C. The connecting portion 32C includes the two inserting portions 32D.

[0047] The base portion 32A is a plate. The base portion 32A includes the two inserting portions 32D. The base portion 32A includes fastening holes for insertion of fastening members (not shown). One of the inserting portions 32D extends from one end of the base portion 32A in the horizontal direction. The other inserting portion 32D extends from the other end of the base portion 32A in the horizontal direction.

[0048] Third Metal Bracket and Fourth Metal Bracket As shown in Fig. 2, the third metal brackets 33 connect the steel horizontal member 11 and the third wooden horizontal members 23. The third metal brackets 33 have the same structure as the first metal bracket 31. The fourth metal brackets 34 connect the additional steel horizontal member 12 and the third wooden horizontal members 23. The fourth metal brackets 34 have the same structure as the first metal bracket 31.

[0049] Fifth Metal Bracket As shown in Fig. 3, one of the fifth metal brackets 35 connects the steel horizontal member 11 and the first wooden post 41. The other fifth metal bracket 35 connects the steel horizontal member 11 and the second wooden post 42.

[0050] As shown in Figs. 3 and 4, the fifth metal brackets 35 are T-shaped metal brackets. Each fifth metal bracket 35 includes a base portion 35A that is fixed to a side surface of the post by fastening members and a fastening portion 35B that extends perpendicular to the base portion 35A. The fastening portion 35B is fastened to the web 15 of the steel horizontal member 11 by two metal plates 36.

[0051] Posts As shown in Fig. 2, the first wooden post 41 supports one end of the steel horizontal member 11. The second wooden post 42 supports another end of the steel horizontal member 11. The steel horizontal member 11 is supported by the first wooden post 41 and the second wooden post 42. The intermediate portion of the steel horizontal member 11 is not supported by any posts. The intermediate wooden post 40 supports one end of the first wooden horizontal member 21 and supports one end of each of the two second wooden horizontal members 22. The third wooden post 43 supports one end of one of the second wooden horizontal members 22 and one end of one of the fourth wooden horizontal members 24. The fourth wooden post 44 supports one end of the other second wooden horizontal member 22 and one end of one of the fifth wooden horizontal members 25.

[0052] Operation of Present Embodiment In a referential example of the frame structure 10 in the upper section of the room 5 forming the large open space SA, the frame structure 10 may include parallel steel horizontal members 11. In this case, the two ends of each steel horizontal member 11 are supported by wooden posts. However, in this case, in order to form a large open space SA, three or more steel horizontal members 11 may be required. This may increase the construction costs.

[0053] In the present embodiment, in a plan view, the steel horizontal member 11 is arranged to extend across the large open space SA. In the intermediate portion of the steel horizontal member 11, the first wooden horizontal member 21 is arranged orthogonal to the steel horizontal member 11. The first wooden horizontal member 21 is connected to the steel horizontal member 11 by the first metal bracket 31. This allows a larger open space SA to be formed in the room 5 with a single steel horizontal member 11 and limits the number of the steel horizontal members 11.

[0054] Moreover, in the present embodiment, the steel horizontal member 11 is longer than the first wooden horizontal member 21. In other words, the first wooden horizontal member 21 is shorter than the steel horizontal member 11. This has the following advantage. In a referential example, the steel horizontal member 11 and the first wooden horizontal member 21 of the present embodiment switch positions. In this case, the first wooden horizontal member 21 will be longer than the steel horizontal member 11. The first wooden horizontal member 21 in the frame structure 10 in the referential example may deform more greatly than the first wooden horizontal member 21 in the frame structure 10 of the present embodiment. Therefore, when the steel horizontal member 11 is longer than the first wooden horizontal member 21 like in the frame structure 10 of the present embodiment, the large open space SA can be formed under the steel horizontal member 11 more readily.

[0055] Further, in the present embodiment, one end of the first wooden horizontal member 21 is connected to the steel horizontal member 11 and the other end of the first wooden horizontal member 21 is connected to the intermediate wooden post 40. In this manner, the frame structure 10 includes wooden posts. Therefore, compared to when using steel pipes or H-shaped steel posts, the number of steel members can be reduced.

[0056] Advantages of Present Embodiment The advantages of the present embodiment will now be described. (1) The frame structure 10 includes the steel horizontal member 11, the first wooden horizontal member 21, which extends orthogonally to the steel horizontal member 11 at the intermediate portion of the steel horizontal member 11, and the first metal bracket 31, which connects the steel horizontal member 11 and the first wooden horizontal member 21. The steel horizontal member 11 is longer than the first wooden horizontal member 21. With this frame structure 10, the frame that covers the upper section of the large open space SA can be formed without arranging any posts in the room 5. Further, compared to when arranging 2025205353   30 Jul 2026 more than one steel horizontal member 11 in parallel, the large open space SA can be formed with a small number of the steel horizontal members 11. Thus, the number of the steel horizontal members 11 can be reduced in the frame structure 10 that covers the upper section of the large open space SA without arranging posts in the room 5.

[0057] (2) The frame structure 10 includes the steel horizontal member 11, the first wooden horizontal member 21, the two second wooden horizontal members 22, the intermediate wooden post 40, which is arranged between the two second wooden horizontal members 22, and the second metal bracket 32, which connects the first wooden horizontal member 21 and the intermediate wooden post 40. The two second wooden horizontal members 22 are arranged along a straight line in parallel to the steel horizontal member 11. The length of the steel horizontal member 11 is greater than the total length of the two second wooden horizontal members 22. With this structure, the large open space SA can be formed under the steel horizontal member 11.

[0058] (3) In the frame structure 10, the two ends of the first wooden horizontal member 21 have the same end surface structure. The connecting portion 31C of the first metal bracket 31 connected to the first wooden horizontal member 21 has the same structure as the connecting portion 32C of the second metal bracket 32 connected to the first wooden horizontal member 21.

[0059] With this structure, since the two ends of the first wooden horizontal member 21 have the same end surface structure, compared to when the two ends of the first wooden horizontal member 21 have different end surface structures, the first wooden horizontal member 21 can be processed more efficiently.

[0060] Another advantage is in that the frame structure 10 that includes steel and wooden materials, when each material has a different connecting structure, the processes performed for each of the steel and wooden materials increase and the number of steps for assembling the frame structure 10 increases. In this regard, in the first wooden horizontal member 21 of the present embodiment, the end surface connected to the wooden material and the end surface connected to the steel material have common connecting structures. Accordingly, the number of processing steps and the number of assembly steps can be streamlined.

[0061] (4) The frame structure 10 includes the steel horizontal member 11, the first wooden horizontal member 21, the two second wooden horizontal members 22, the intermediate wooden post 40, which is arranged between the two second wooden horizontal members 22, and the second metal bracket 32, which connects the first wooden horizontal member 21 and the intermediate wooden post 40. The frame structure 10 further includes the third wooden horizontal members 23, the additional steel horizontal member 12, the third metal brackets 33, which connect the steel horizontal member 11 and the third wooden horizontal members 23, and the fourth metal brackets 34, which connect the additional steel horizontal member 12 and the third wooden horizontal members 23. The third wooden horizontal members 23 are orthogonal to the steel horizontal member 11. Further, the third wooden horizontal members 23 and the first wooden horizontal member 21 are arranged at opposite sides of the steel horizontal member 11. The additional steel horizontal member 12 is arranged parallel to the steel horizontal member 11. Further, the additional steel horizontal member 12 and the second wooden horizontal members 22 are arranged at opposite sides of the steel horizontal member 11. With this structure, a large open space SA can be formed under the steel horizontal member 11 and the additional steel horizontal member 12.

[0062] (5) The frame structure 10 includes the steel horizontal member 11, the first wooden horizontal member 21, the two second wooden horizontal members 22, the intermediate wooden post 40, the first wooden post 41, the second wooden post 42, the fourth wooden horizontal members 24, the fifth wooden horizontal members 25, the third wooden post 43, and the fourth wooden post 44. This structure uses the wooden posts and thus decreases the construction costs of the frame structure 10.

[0063] (6) In the frame structure 10, the steel horizontal member 11 includes the stiffener 18. The first metal bracket 31 includes the base portion 31A, the fastening portion 31B, and the connecting portion 31C, which is connected to the first wooden horizontal member 21. The connecting portion 31C includes the inserting portions 31D. The inserting portions 31D are inserted into the slots 27, which are arranged at the end surface of the first wooden horizontal member 21. With this structure, the first wooden horizontal member 21, which includes the slots 27, can be connected to the steel horizontal member 11 by the first metal bracket 31.

[0064] (7) The building 1 includes the room 5 and the frame structure 10 arranged around the room 5 having one of advantages (1) to (6) described above. With this structure, the large open space SA can be formed with a limited number of steel horizontal members 11.

[0065] Modifications The above embodiment exemplifies, without any intention to limit, an applicable form of the frame structure 10 and the building 1. The frame structure 10 and the building 1 exemplified in the embodiment can take a form different from that illustrated in the embodiment. For example, some of the components of the embodiment may be replaced, changed, or omitted. Alternatively, another component may be added to the embodiment. Modifications of the embodiment will now be described.

[0066] In the present embodiment, the frame structure 10 includes a single first wooden horizontal member 21. However, the number of the first wooden horizontal member 21 is not limited. The frame structure 10 may include multiple first wooden horizontal members 21.

[0067] In the present embodiment, the frame structure 10 includes the additional steel horizontal member 12. However, the additional steel horizontal member 12 may be omitted from the frame structure 10. Further, the frame structure 10 of the present embodiment may include a wooden horizontal member instead of the additional steel horizontal member 12. In this case, the wooden horizontal member can be supported by a post. The frame structure 10 may be changed in accordance with the layout of the room 5 and the layout around the room 5 that includes the steel horizontal member 11.

[0068] In the frame structure 10 of the present embodiment, there is no limitation to the structure of the steel horizontal member 11. The steel horizontal member 11 may be formed by a pair of channel steels. The present specification discloses the following technique.

[0069] Clause 1 A frame structure arranged around a room inside a building, the frame structure including: a steel horizontal member; a first wooden horizontal member orthogonal to the steel horizontal member at an intermediate portion of the steel horizontal member; and a first metal bracket connecting the steel horizontal member and the first wooden horizontal member, where the steel horizontal member is longer than the first wooden horizontal member.

[0070] Clause 2 The frame structure according to clause 1, further including: two second wooden horizontal members arranged along a straight line in parallel to the steel horizontal member; an intermediate wooden post arranged between the two second wooden horizontal members; and a second metal bracket connecting the first wooden horizontal member and the intermediate wooden post, where a length of the steel horizontal member is greater than a total length of the two second wooden horizontal members.

[0071] Clause 3 The frame structure according to clause 2, where the first wooden horizontal member has two ends having a same end surface structure, and a connecting portion of the first metal bracket connected to the first wooden horizontal member is identical in structure to a connecting portion of the second metal bracket connected to the first wooden horizontal member.

[0072] Clause 4 The frame structure according to clause 2, further including: a third wooden horizontal member orthogonal to the steel horizontal member and arranged at a side of the steel horizontal member opposite to the first wooden horizontal member; an additional steel horizontal member arranged in parallel to the steel horizontal member at a side of the steel horizontal member opposite to the second wooden horizontal member; a third metal bracket connecting the steel horizontal member and the third wooden horizontal member; and a fourth metal bracket connecting the additional steel horizontal member and the third wooden horizontal member.

[0073] Clause 5 The frame structure according to clause 2, further including: a first wooden post supporting one end of the steel horizontal member; a second wooden post supporting another end of the steel horizontal member; a fourth wooden horizontal member arranged in parallel to the first wooden horizontal member and connected to the first wooden post; a fifth wooden horizontal member arranged in parallel to the first wooden horizontal member and connected to the second wooden post; a third wooden post supporting the fourth wooden horizontal member and one of the two second wooden horizontal members; and a fourth wooden post supporting the fifth wooden horizontal member and one of the two second wooden horizontal members.

[0074] Clause 6 The frame structure according to clause 1, where the steel horizontal member includes a stiffener, the first metal bracket includes a base portion, a fastening portion projecting from a first surface of the base portion and fastened to the stiffener, and a connecting portion connected to the first wooden horizontal member, and the connecting portion includes an inserting portion inserted into a slot in an end surface of the first wooden horizontal member.

[0075] Clause 7 A building, including: a room; and a frame structure according to any one of clauses 1 to 6 arranged around the room. REFERENCE SIGNS LIST

[0076] 1) building; 5) room; 10) frame structure; 11) steel horizontal member; 12) additional steel horizontal member; 18) stiffener; 21) first wooden horizontal member; 22) second wooden horizontal member; 23) third wooden horizontal member; 24) fourth wooden horizontal member; 25) fifth wooden horizontal member; 27) slot; 31) first metal bracket; 31A) base portion; 31B) fastening portion; 31C) connecting portion; 31D) inserting portion; 31R) first surface; 31S) second surface; 32) second metal bracket; 32A) base portion; 32C) connecting portion; 32D) inserting portion; 33) third metal bracket; 34) fourth metal bracket; 35) fifth metal bracket; 35A) base portion; 35B) fastening portion; 40) intermediate wooden post; 41) first wooden post; 42) second wooden post; 43) third wooden post; 44) fourth wooden post.

Claims

1. A frame structure arranged around a room inside a building, the frame structure comprising:a steel horizontal member;a first wooden horizontal member orthogonal to the steel horizontal member at an intermediate portion of the steel horizontal member;a first metal bracket connecting the steel horizontal member and the first wooden horizontal member;two second wooden horizontal members arranged along a straight line in parallel to the steel horizontal member;an intermediate wooden post arranged between the two second wooden horizontal members; anda second metal bracket connecting the first wooden horizontal member and the intermediate wooden post, whereina length of the steel horizontal member is longer than a length of the first wooden horizontal member, and is greater than a total length of the two second wooden horizontal members.

2. The frame structure according to claim 1, whereinthe first wooden horizontal member has two ends having a same end surface structure, anda connecting portion of the first metal bracket connected to the first wooden horizontal member is identical in structure to a connecting portion of the second metal bracket connected to the first wooden horizontal member.

3. The frame structure according to claim 1 or 2, further comprising:a third wooden horizontal member orthogonal to the steel horizontal member and arranged at a side of the steel horizontal member opposite to the first wooden horizontal member;an additional steel horizontal member arranged in parallel to the steel horizontal member at a side of the steel horizontal member opposite to the second wooden horizontal members;2025205353   30 Jul 2026a third metal bracket connecting the steel horizontal member and the third wooden horizontal member; anda fourth metal bracket connecting the additional steel horizontal member and the third wooden horizontal member.

4. The frame structure according to claim 1 or 2, further comprising:a first wooden post supporting one end of the steel horizontal member;a second wooden post supporting another end of the steel horizontal member;a fourth wooden horizontal member arranged in parallel to the first wooden horizontal member and connected to the first wooden post;a fifth wooden horizontal member arranged in parallel to the first wooden horizontal member and connected to the second wooden post;a third wooden post supporting the fourth wooden horizontal member and one of the two second wooden horizontal members; anda fourth wooden post supporting the fifth wooden horizontal member and one of the two second wooden horizontal members.

5. The frame structure according to any one of claims 1 to 4, whereinthe steel horizontal member includes a stiffener,the first metal bracket includes a base portion, a fastening portion projecting from a first surface of the base portion and fastened to the stiffener, and a connecting portion connected to the first wooden horizontal member, andthe connecting portion includes an inserting portion inserted into a slot in an end surface of the first wooden horizontal member.

6. A building, comprising:a room; anda frame structure according to any one of claims 1 to 5 arranged around theroom.

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