Composite beam, building, and reinforcing metal fitting

Abstract

To provide a composite beam, a building, and a reinforcing metal fitting that enable suitable placement of equipment such as a curtain box on a ceiling.SOLUTION: A composite beam 10 is a composite beam 10 constituting a part of a framework of a building, and includes a first beam member 20 having a first end face 21 and a second end face opposite the first end face 21 in the longitudinal direction X1, and a second beam member 30 having a third end face 34 and a fourth end face opposite the third end face 34 in the longitudinal direction X2. The second beam member 30 is disposed along the first beam member 20 below the lower face 20Y of the first beam member 20, and is joined to the first beam member 20. In the longitudinal direction X1 of the first beam member 20, the third end face 34 is located inside the first end face 21, and the fourth end face is located inside the second end face.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present disclosure relates to composite beams, buildings, and reinforcing hardware. [Background technology]

[0002] In order to improve the strength of buildings, there are known techniques for strengthening the structural framework itself, which includes wooden beams and wooden columns. For example, the structural framework disclosed in Patent Document 1 includes a plurality of wooden columns, a wooden beam spanning the plurality of wooden columns, and a steel reinforcement member disposed along the lower surface of the wooden beam and having an end portion joined to the wooden beam. The end portion of the steel reinforcement member is joined to the side surface of the wooden column. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2010-031610 A Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, there are cases where equipment is installed on the ceiling of a building. One example of such equipment is a curtain box. For example, when a curtain box is installed near a wall, if the curtain box is attached to the underside of a beam, the curtain box protrudes downward from the ceiling surface, causing the curtain box to lose the continuity of the ceiling surface in the horizontal direction. Thus, it is difficult to suitably install equipment in the space above the ceiling where the beam is installed. [Means for solving the problem]

[0005] (1) A composite beam that solves the above problem is a composite beam that forms part of a frame of a building, and comprises a first beam member having a first end face and a second end face opposite the first end face in the longitudinal direction, and a second beam member having a third end face and a fourth end face opposite the third end face in the longitudinal direction, wherein the second beam member is positioned below the lower surface of the first beam member and along the first beam member and is joined to the first beam member, and in the longitudinal direction of the first beam member, the third end face is located more inward than the first end face, and the fourth end face is located more inward than the second end face.

[0006] According to this configuration, when the first end face of the first beam member is connected to a structural material constituting the building, a space is provided between the structure and the third end face. Also, when the second end face of the first beam member is connected to a structural material constituting the building, a space is provided between the structure and the fourth end face. Since equipment can be placed in the space between the structure and the third end face or the space between the structure and the fourth end face, equipment can be conveniently placed on the ceiling.

[0007] (2) In the composite beam described in (1) above, the first beam member is made of wood and the second beam member is made of steel. With this configuration, the strength of the composite beam can be improved compared to when the second beam member is made of wood.

[0008] (3) The composite beam described in (1) or (2) above further includes a plurality of first fittings that connect the second beam member to the first beam member, the first fittings being connected to the lower surface of the first beam member and the upper surface of the second beam member. With this configuration, the lower surface of the first beam member and the upper surface of the second beam member can be connected by the plurality of first fittings, so that it is possible to suitably suppress misalignment between the first beam member and the second beam member.

[0009] (4) In the composite beam described in (3) above, the first fitting has a first plate disposed between the first beam member and the second beam member, a first protruding portion protruding from the first plate so as to be inserted through a first insertion hole formed in the first beam member, and a second protruding portion protruding from the first plate so as to be inserted through a second insertion hole formed in the second beam member. With this configuration, the first protruding portion is inserted into the first insertion hole of the first beam member and the second protruding portion is inserted into the second insertion hole of the second beam member, thereby more suitably suppressing misalignment between the first beam member and the second beam member.

[0010] (5) In the composite beam described in (3) or (4) above, the distance between the first metal fittings arranged near the ends of the composite beam in the longitudinal direction of the first beam member is narrower than the distance between the first metal fittings arranged near the center of the composite beam. With this configuration, the number of first metal fittings near the center of the composite beam can be reduced, thereby making the assembly work of the composite beam more efficient.

[0011] (6) The composite beam according to any one of (1) to (5) above, further comprising a second metal fitting, the second metal fitting having a first connecting portion connected to a first beam member end underside located between the first end face and the third end face in the longitudinal direction of the first beam member among the underside of the first beam member, and a second connecting portion connected to the third end face of the second beam member. According to this configuration, the second metal fitting can connect the first beam member end underside of the underside of the first beam member and the third end face of the second beam member, thereby suitably suppressing misalignment between the first beam member and the second beam member.

[0012] (7) In the composite beam described in any one of (1) to (6) above, a gap is provided between the lower surface of the first beam member and the upper surface of the second beam member. With this configuration, air can pass through the gap between the lower surface of the first beam member and the upper surface of the second beam member, thereby suppressing corrosion of the first beam member and the second beam member.

[0013] (8) A building that solves the above problem is a building that includes a structural material that is a girder, beam, or column, a composite beam connected to the structural material, and equipment arranged near the end of the composite beam, the composite beam including a first beam member having a first end face connected to a side surface of the structural material, and a second beam member having a third end face facing the side surface of the structural material, the second beam member being arranged below the lower surface of the first beam member so as to be along the first beam member and being joined to the first beam member, and the equipment being arranged between the structural material and the third end face. According to this configuration, the equipment is arranged in the space between the structural material and the third end face. This can prevent a part of the equipment from protruding downward from the ceiling, or can reduce the dimension of the downward protrusion.

[0014] (9) A building that solves the above problem is a building comprising a structural material that is a girder, beam, or column, and a composite beam connected to the structural material, the composite beam comprising a first beam member having a first end face connected to a side surface of the structural material, and a second beam member having a third end face facing the side surface of the structural material, the second beam member being disposed along the first beam member below the lower surface of the first beam member and being joined to the first beam member, and an arrangement space in which equipment can be disposed is provided between the structural material and the third end surface. With this configuration, equipment can be disposed in the arrangement space, making it possible to suitably arrange equipment on the ceiling.

[0015] (10) A reinforcing metal fitting that solves the above problem is provided for a composite beam, the composite beam comprising a first beam member having a first end face and a second end face opposite the first end face in the longitudinal direction, and a second beam member having a third end face and a fourth end face opposite the third end face in the longitudinal direction, the second beam member being disposed below the lower surface of the first beam member and along the first beam member, the third end face being located inside the first end face in the longitudinal direction of the first beam member, and being connected to a lower surface of the first beam member end portion located between the first end face and the third end face in the longitudinal direction of the first beam member, of the lower surface of the first beam member, and being connected to the third end face. According to this configuration, the third end face of the second beam member is connected to the lower surface of the first beam member end portion by the reinforcing metal fitting, so there is no need to connect the third end face to a structural material. When the first end surface of the first beam member is connected to a structural material of a building, equipment can be placed in the space generated between the structural material and the third end surface, allowing the equipment to be conveniently placed on the ceiling. Effect of the Invention

[0016] The composite beams, buildings, and reinforcing fittings disclosed herein allow for convenient placement of equipment such as curtain boxes on the ceiling. [Brief description of the drawings]

[0017] [Figure 1] FIG. 1 is a schematic diagram of a building according to an embodiment. [Diagram 2] FIG. 1 is a side view of a composite beam of an embodiment. [Diagram 3] FIG. 13 is a side view of an end of a composite beam of an embodiment. [Figure 4] 3 is a cross-sectional view taken along line D4-D4 in FIG. 2. [Diagram 5] FIG. [Figure 6] FIG. 2 is a partial perspective view of a composite beam according to an embodiment. [Figure 7] FIG. 11 is a side view of a composite beam according to a first modified example. [Figure 8] FIG. 11 is a diagram of a building according to a second modified example. [Figure 9]FIG. 13 is a diagram of a building according to a third modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] <Embodiment> A building 1, a composite beam 10, and a reinforcing metal fitting 60 according to the embodiment will be described with reference to Figs.

[0019] <Buildings> FIG. 1 is a schematic diagram showing an example of a building 1. Examples of the building 1 include a detached house, an apartment building, and a public facility. The building 1 in this embodiment is a detached house. The building 1 has a first space S1 and a second space S2 communicating with the first space S1. The first space S1 is, for example, an indoor space of the building 1. An example of the first space S1 is a room such as a living room, a dining room, a kitchen, a bedroom, and a child's room. The second space S2 is, for example, an outdoor space of the building 1. An example of the second space S2 is a piloti. The second space S2 may be an indoor space different from the first space S1. The building 1 has a first ceiling 2 arranged in the first space S1 and a second ceiling 3 arranged in the second space S2.

[0020] The building 1 includes a structural member 4, a composite beam 10, and equipment 5. The structural member 4 constitutes a part of the framework of the building 1. The structural member 4 and the composite beam 10 constitute a part of the structural frame of the building 1. In this embodiment, the structural member 4 is a girder 4A. The girder 4A is a part of the framework that constitutes the wall 6 of the building 1. The wall 6 is located between the first space S1 and the second space S2. The structural member 4 may have an additional girder 4B located on the opposite side of the girder 4A in the first space S1. The distance D1 from the girder 4A to the additional girder 4B is, for example, 6.5 m or more and 7.5 m or less. The distance D1 may be 5.5 m or more and 6.5 m or less. The distance D1 may be 4.5 m or more and 5.5 m or less. The distance D1 may be 3.5 m or more and 4.5 m or less.

[0021] The equipment 5 is attached to the first ceiling 2 so as to be exposed to the first space S1. The equipment 5 is, for example, a curtain case. The curtain case houses a curtain rail. The curtain rail may be a rail for automatically opening and closing a curtain. The equipment 5 may be any equipment that can be attached to a ceiling. The equipment 5 may be indirect lighting.

[0022] The equipment 5 is arranged near the end 11 of the composite beam 10. The equipment 5 is arranged around the girder 4A. The building 1 may have additional equipment 5A arranged around the additional girder 4B. The additional equipment 5A is arranged near the end 11 opposite to the end 11 where the equipment 5 is arranged. The equipment 5 and the additional equipment 5A may be different pieces of equipment. The additional equipment 5A may not be arranged.

[0023] <Composite beam> As shown in FIG. 1, a composite beam 10 forms part of the framework of a building 1. The composite beam 10 is disposed on a first ceiling 2. The composite beam 10 is disposed between a girder 4A and an additional girder 4B. The composite beam 10 is connected to a structural member 4. The composite beam 10 is connected to the girder 4A and the additional girder 4B. The building 1 may have a plurality of composite beams 10 arranged in a direction from the front of the page to the back of the page in FIG. 1.

[0024] As shown in FIG. 2, in the longitudinal direction X1, the composite beam 10 has an end portion 11 and a central portion 12. The end portion 11 of the composite beam 10 includes a first end portion 11A and a second end portion 11B opposite to the first end portion 11A. The length L of the composite beam 10 is set according to the distance D1 from the girder 4A to the additional girder 4B. The length L is, for example, 6.5 m or more and 7.5 m or less. The length L may be 5.5 m or more and 6.5 m or less. The length L may be 4.5 m or more and 5.5 m or less. The length L may be 3.5 m or more and 4.5 m or less.

[0025] The composite beam 10 is formed by combining two beam members. The beam members extend along the longitudinal direction X1. The material of one of the two beam members is different from the material of the other of the two beam members. The composite beam 10 includes a first beam member 20 and a second beam member 30.

[0026] <First beam member> The first beam member 20 is made of wood. The wood may be, for example, solid wood or laminated wood. The first beam member 20 may be made of, for example, laminated timber made of the same grade. When the first beam member 20 is made of laminated timber made of the same grade, the first beam member 20 is arranged so that the lamination direction of the sawn boards is along the vertical direction.

[0027] The first beam member 20 has a first end face 21 and a second end face 22 opposite to the first end face 21 in the longitudinal direction X1. The first end face 21 is connected to a side face 4Z of the structural member 4. In this embodiment, the side face 4Z of the structural member 4 is a side face of the girder 4A. The second end face 22 is connected to a side face of the additional girder 4B. A first length L1 of the first beam member 20 is defined as the length from the first end face 21 to the second end face 22 in the longitudinal direction X1 of the first beam member 20. The first length L1 of the first beam member 20 is the same as the length L of the composite beam 10.

[0028] As shown in FIG. 3, the first beam member 20 is connected to the structural member 4 by the first support bracket 7 and the second support bracket 8. The first support bracket 7 has a first support bracket body 7A and two slit insertion parts 7B formed integrally with the first support bracket body 7A. The first support bracket body 7A has a plate-shaped part that contacts the side surface 4Z of the structural member 4 and the first end face 21 of the first beam member 20. The slit insertion part 7B has a plate-shaped part that extends perpendicularly to the first support bracket body 7A. The slit insertion part 7B is inserted into a slit 21A formed in the first end face 21. As shown in FIG. 6, two slits 21A are formed in the first end face 21 of the first beam member 20. The first shaft member 7C penetrates the structural member 4 and the first support bracket body 7A, thereby fixing the first support bracket body 7A to the structural member 4. The first shaft member 7C may include one or more sets of bolts and nuts.

[0029] The first supporting bracket 7 is fixed to the first beam member 20 by the first additional shaft member 7D penetrating through the first beam member 20 and the two slit insertion portions 7B. The first additional shaft member 7D may include a drift pin.

[0030] The second support bracket 8 has a second support bracket main body 8A and a second support bracket support part 8B formed integrally with the second support bracket main body 8A. The second support bracket main body 8A is configured in an L-shape that contacts the side surface 4Z of the structural material 4 and the lower surface 20Y of the first beam member 20. The second support bracket support part 8B is connected to a portion of the second support bracket main body 8A that contacts the lower surface 20Y of the first beam member 20 and a portion that contacts the side surface 4Z of the structural material 4. The second support bracket main body 8A is fixed to the structural material 4 by the second shaft member 8C penetrating the structural material 4 and the portion of the second support bracket main body 8A that contacts the side surface 4Z of the structural material 4. The second shaft member 8C may include a set of bolts and nuts.

[0031] The portion of the second support bracket body 8A that contacts the underside 20Y of the first beam member 20 is fixed to the underside 20Y of the first beam member 20 by screws or the like. In the longitudinal direction X1, the dimension of the portion of the second support bracket body 8A that contacts the underside 20Y of the first beam member 20 is 120 mm or less. In the longitudinal direction X1, the dimension of the portion of the second support bracket body 8A that contacts the underside 20Y of the first beam member 20 is 100 mm or less.

[0032] As shown in FIG. 4, the first height H1 of the first beam member 20 in the vertical direction is 100 mm or more. The first height H1 of the first beam member 20 in the vertical direction may be 120 mm or more. The first height H1 of the first beam member 20 in the vertical direction is 330 mm or less. The first height H1 of the first beam member 20 in the vertical direction may be 210 mm or less. The first width W1 of the first beam member 20 is 100 mm or more. The dimension of the first width W1 of the first beam member 20 may be equal to or less than the dimension of the first height H1 of the first beam member 20.

[0033] <Second beam member> As shown in FIG. 4, the second beam member 30 is made of steel. The steel is, for example, an H-shaped steel. The steel may be, for example, an I-shaped steel. The second beam member 30 has a first flange 31, a second flange 32, and a web 33. The first flange 31 forms an upper surface 30X of the second beam member 30. The second flange 32 forms a lower surface 30Y of the second beam member 30. The web 33 connects the first flange 31 and the second flange 32.

[0034] As shown in FIG. 2, the second beam member 30 has a third end face 34 and a fourth end face 35 opposite to the third end face 34 in the longitudinal direction X2. The third end face 34 faces a side face 4Z of the structural member 4. The third end face 34 faces a side face of the additional girder 4B. The longitudinal direction X2 coincides with the longitudinal direction X1. A second length L2 of the second beam member 30 is defined as the length from the third end face 34 to the fourth end face 35 in the longitudinal direction X2. The ratio of the second length L2 to the first length L1 is 0.7 or more.

[0035] The second beam member 30 is disposed below the lower surface 20Y of the first beam member 20 so as to be along the first beam member 20, and is joined to the first beam member 20. In the longitudinal direction X1 of the first beam member 20, the third end face 34 is located inside the first end face 21, and the fourth end face 35 is located inside the second end face 22. "Located inside" indicates that it is located closer to the midline of the first beam member 20 in the longitudinal direction X1 than the comparison target. In the longitudinal direction X1, the third end face 34 is located 250 mm or more inside the first end face 21. In the longitudinal direction X1, the third end face 34 may be located 350 mm or more inside the first end face 21. In the longitudinal direction X1, the fourth end face 35 is located 250 mm or more inside the second end face 22. The fourth end surface 35 may be located 350 mm or more inward from the second end surface 22 in the longitudinal direction X1.

[0036] 3 and 4, an end plate 36 perpendicular to the longitudinal direction X2 is attached to an end of the second beam member 30 by welding or the like. The end plate 36 attached to one end of the second beam member 30 forms a third end face 34. The end plate 36 attached to the other end of the second beam member 30 forms a fourth end face 35.

[0037] As shown in FIG. 4, the second height H2 of the second beam member 30 is 100 mm or more. The second height H2 of the second beam member 30 may be lower than the first height H1 of the first beam member 20. The second height H2 of the second beam member 30 is 250 mm or less. The second height H2 of the second beam member 30 may be 200 mm or less. The second width W2 of the second beam member 30 is 100 mm or more. The second width W2 of the second beam member 30 may be shorter than the first width W1 of the first beam member 20.

[0038] 2, the second beam member 30 may have a plurality of piping holes 37 formed penetrating the web 33. For example, ventilation piping, drainage piping, etc. are arranged in the piping holes 37. The piping holes 37 allow the ventilation piping, drainage piping, etc. to be suitably arranged in the ceiling space of the building 1.

[0039] <Placement space> 1 and 2, an arrangement space SA in which equipment 5 can be arranged is provided between the structural material 4 and the third end surface 34. The equipment 5 is arranged between the structural material 4 and the third end surface 34. The arrangement space SA may also be provided between the structural material 4 and the fourth end surface 35.

[0040] The arrangement space SA is provided in the first ceiling 2 so as to open downward. The first ceiling surface 2A of the first ceiling 2 is located below the lower surface 30Y of the second beam member 30 of the composite beam 10. By arranging the equipment 5 in the arrangement space SA, the equipment 5 can be arranged above the first ceiling surface 2A of the first ceiling 2. By arranging the equipment 5 in the arrangement space SA, when the height of the first ceiling surface 2A of the first ceiling 2 is made equal to the height of the second ceiling surface 3A of the second ceiling 3, the first ceiling surface 2A and the second ceiling surface 3A can be made to appear as a single flat surface.

[0041] As shown in FIG. 3, the composite beam 10 has a step portion 13. The step portion 13 is a portion of the composite beam 10 that is provided as a cutout between the upper surface 20X of the first beam member 20 and the lower surface 30Y of the second beam member 30. The step portion 13 in this embodiment is a portion formed by the lower surface 23 of the first beam member end and the third end surface 34. The lower surface 23 of the first beam member end is a surface of the lower surface 20Y that is located between the first end surface 21 and the third end surface 34 in the longitudinal direction X1 of the first beam member 20. In FIG. 3, the side surface of the composite beam 10 on the first end 11A side is illustrated, but the step portion 13 is also provided on the second end 11B side. The arrangement space SA is located in the step portion 13.

[0042] <First metal fitting> 2, the composite beam 10 further includes a plurality of first fittings 40. In this embodiment, the composite beam 10 includes nine first fittings 40. The plurality of first fittings 40 connect the second beam member 30 to the first beam member 20. The first fittings 40 are connected to the lower surface 20Y of the first beam member 20 and the upper surface 30X of the second beam member 30.

[0043] The multiple first fittings 40 are arranged, for example, in the longitudinal direction X1. When multiple first fittings 40 are arranged at each of the end portion 11 and the central portion 12, the first fittings 40 arranged near the central portion 12 are arranged more sparsely than the first fittings 40 arranged near the end portion 11. "The first fittings 40 are arranged sparsely" indicates that the number of first fittings 40 arranged within a predetermined interval in the central portion 12 in the longitudinal direction X1 is smaller than the number of first fittings 40 arranged within a predetermined interval in the end portion 11.

[0044] In the longitudinal direction X1 of the first beam member 20, the interval G1 between the first fittings 40 arranged near the end 11 of the composite beam 10 is narrower than the interval G2 between the first fittings 40 arranged near the central portion 12 of the composite beam 10. The intervals G1 and G2 between the first fittings 40 are, for example, the length between the axial centers of the adjacent first fittings 40 in the longitudinal direction X1. In the example of FIG. 2, the first fitting 40A is the first fitting 40 arranged near the first end 11A of the end 11 of the composite beam 10. The first fitting 40B is the first fitting 40 arranged near the central portion 12 of the composite beam 10. The first fitting 40C is the first fitting 40 arranged near the second end 11B of the end 11 of the composite beam 10. The intervals G1 and G2 are set according to the length L of the composite beam 10, the number of the multiple first fittings 40, and the like. The distance G1 between the first fittings 40 arranged near the ends 11 of the composite beam 10 is, for example, 500 mm. The distance G2 between the first fittings 40 arranged near the center 12 of the composite beam 10 is, for example, 1000 mm.

[0045] 4 and 5, the first fitting 40 has a first plate 41, a first protruding portion 42, and a second protruding portion 43. The first plate 41 is disposed between the first beam member 20 and the second beam member 30. The first protruding portion 42 protrudes from the first plate 41 so as to pass through a first insertion hole 24 formed in the first beam member 20. The second protruding portion 43 protrudes from the first plate 41 so as to pass through a second insertion hole 38 formed in the second beam member 30. The second insertion hole 38 is formed in the first flange 31 of the second beam member 30.

[0046] When viewed in the longitudinal direction X1, the third width W3 of the first plate 41 is smaller than the first width W1 of the first beam member 20. When viewed in the longitudinal direction X1, the third width W3 of the first plate 41 is larger than the second width W2 of the second beam member 30. Since the third width W3 of the first plate 41 is smaller than the first width W1 of the first beam member 20 and larger than the second width W2 of the second beam member 30, water flowing on the surface of the first beam member 20 is less likely to accumulate on the first plate 41. Therefore, water flowing on the surface of the first beam member 20 is likely to flow downward from the first plate 41 without touching the lower surface 20Y of the first beam member 20. Therefore, in the composite beam 10, water is less likely to seep into the first beam member 20 made of wood.

[0047] The first protruding portion 42 protrudes upward from the first plate 41. The third height H3 of the first protruding portion 42 is 60 mm or more and is equal to or less than the first height H1 of the first beam member 20.

[0048] As shown in Figs. 3 and 4, a first through hole 25 is formed in the first beam member 20 and the first protruding portion 42, penetrating the first beam member 20 and the first protruding portion 42 in the horizontal direction. The first through hole 25 penetrates the side surface 20Z of the first beam member 20. In this embodiment, two first through holes 25 are formed aligned in the vertical direction. A drift pin 44 is disposed in the first through hole 25. The drift pin 44 connects the first beam member 20 and the first metal fitting 40. The first metal fitting 40 may be connected to the first beam member 20 by, for example, a screw or the like that penetrates the first plate 41.

[0049] 4 and 5, the second protrusion 43 protrudes downward from the first plate 41. The second protrusion 43 may include a plurality of protrusions. In the present embodiment, the second protrusion 43 includes four protrusions. A second insertion hole 38 through which the second protrusion 43 is inserted is formed in the first flange 31. The second protrusion 43 is disposed in the second insertion hole 38 so as to penetrate the first flange 31.

[0050] For example, the second protruding portion 43 is a bolt. A nut 45 is attached to a portion of the second protruding portion 43 that protrudes from the first flange 31. The nut 45 connects the second beam member 30 and the first metal fitting 40. The second protruding portion 43 may be a pole.

[0051] 3, in this embodiment, a gap is provided between the lower surface 20Y of the first beam member 20 and the upper surface 30X of the second beam member 30. The first metal fitting 40 connects the first beam member 20 and the second beam member 30 so that the lower surface 20Y of the first beam member 20 and the upper surface 30X of the second beam member 30 do not come into contact with each other. In this embodiment, the dimension from the lower surface 20Y of the first beam member 20 to the upper surface 30X of the second beam member 30 in the vertical direction coincides with the thickness of the first plate 41.

[0052] <Second metal fitting> As shown in FIG. 2, the composite beam 10 further includes a second metal fitting 50. The second metal fitting 50 connects the second beam member 30 to the first beam member 20. The second metal fitting 50 is arranged in the arrangement space SA. In this embodiment, the composite beam 10 includes a second metal fitting 50 arranged at the first end 11A and a second metal fitting 50 arranged at the second end 11B. The second metal fitting 50 arranged at the first end 11A will be described below, but the second metal fitting 50 arranged at the second end 11B is also configured similarly to the second metal fitting 50 arranged at the first end 11A.

[0053] 6 , the second fitting 50 has a first connecting portion 51 and a second connecting portion 52. The first connecting portion 51 is connected to the lower surface 23 of the first beam member end portion of the first beam member 20. The second connecting portion 52 is connected to the third end surface 34 of the second beam member 30.

[0054] The first connecting portion 51 has a first plate-shaped member 53 in contact with the lower surface 23 of the first beam member end portion. The first plate-shaped member 53 is connected to the first beam member 20 by a first connecting member 53A. The first connecting member 53A is, for example, a lag screw bolt. The second connecting portion 52 has a second plate-shaped member 54 in contact with the third end surface 34. The second plate-shaped member 54 is connected to the first beam member 20 by a second connecting member 54A. The second connecting member 54A is, for example, a bolt and a nut.

[0055] The first connecting portion 51 and the second connecting portion 52 are integrally formed. The first plate-shaped member 53 and the second plate-shaped member 54 are integrally formed by welding, pressing, or the like. The second metal fitting 50 has an L-shape by connecting an end of the second plate-shaped member 54 to an end of the first plate-shaped member 53.

[0056] The second metal fitting 50 has a support portion 55. The support portion 55 is connected to the first connecting portion 51 and the second connecting portion 52. The support portion 55 has a third plate-like member 56 that is disposed perpendicular to the first plate-like member 53 and the second plate-like member 54.

[0057] The support portion 55 is formed integrally with the first connecting portion 51 and the second connecting portion 52. The third plate-like member 56 is connected by welding or the like to a surface of the first plate-like member 53 opposite to a surface that contacts the first beam member end lower surface 23. The third plate-like member 56 is connected by welding or the like to a surface of the second plate-like member 54 opposite to a surface that contacts the third end surface 34.

[0058] The second metal fitting 50 is also called a reinforcing metal fitting 60. The second metal fitting 50 is provided on the composite beam 10 according to the embodiment. The second metal fitting 50 may also be provided on composite beams of other structures.

[0059] A first effect of this embodiment will be described. Equipment may be installed on the ceiling of a building. One example of the equipment is a curtain box. For example, when a curtain box is installed near a wall, if the curtain box is attached to the underside of a beam, the curtain box protrudes downward from the ceiling surface, causing the curtain box to lose the continuity of the ceiling surface in the horizontal direction. In the composite beam 10 of this embodiment, the third end surface 34 of the second beam member 30 is located inside the first end surface 21 of the first beam member 20 in the longitudinal direction X1 of the first beam member 20. This allows a space to be provided between the second beam member 30 and the structural material 4 when the first beam member 20 is joined to the structural material 4 so that the first end surface 21 of the first beam member 20 is in contact with the structural material 4. This allows the equipment 5 to be placed in the space between the second beam member 30 and the structural material 4.

[0060] A second effect of this embodiment will be described. When installing a curtain box on a ceiling, a method of providing a step by a notch at the end of a wooden beam is also considered in order to place the curtain box at a position higher than the ceiling surface. However, when providing a step by a notch in a wooden beam, there is a risk that a crack will occur starting from the corner of the step due to a load. The longer the length of a wooden beam, the more likely it is that a crack will occur starting from the corner of the step due to a larger load, so a wooden beam in which a step is provided by a notch is restricted in length. Due to such length restrictions, in buildings in which a wooden beam in which a step is provided by a notch is used, there is a limit to enlarging the space in which the wooden beam is used. In the composite beam 10 of the embodiment, a step portion 13 is formed by the lower surface 23 of the first beam member end of the first beam member 20 and the third end surface 34 of the second beam member 30. With this structure, the composite beam 10 suppresses the occurrence of cracks starting from the corner of the step, so that the length L of the composite beam 10 is easily secured. In a building 1 using a composite beam 10, the composite beam 10 can be made long, so that the first space S1 can be made large.

[0061] A third function of this embodiment will be described. The multiple first metal fittings 40 are arranged so that the interval G2 between the first metal fittings 40 arranged near the central portion 12 of the composite beam 10 is wider than the interval G1 between the first metal fittings 40 arranged near the end portions 11 of the composite beam 10. Since the number of first metal fittings 40 arranged near the central portion 12 can be reduced compared to when all the first metal fittings 40 are arranged with the interval G1, the number of first metal fittings 40 can be reduced. It has been found by a bending test that when the first metal fittings 40 arranged near the end portions 11 of the composite beam 10 are arranged with the interval G1, even if the number of first metal fittings 40 arranged near the central portion 12 is reduced, the rigidity of the composite beam 10 is less affected than when all the first metal fittings 40 are arranged with the interval G1. The manufacturing cost of the composite beam 10 is reduced by reducing the number of first metal fittings 40. In addition, since the number of first metal fittings 40 is small, the number of work steps when assembling the composite beam 10 can be reduced.

[0062] A fourth effect of this embodiment will be described. The first fitting 40 is connected to the first beam member 20 by inserting the first protrusion 42 into the first insertion hole 24 of the first beam member 20, but depending on the tolerance of the first insertion hole 24, there is a risk that the first protrusion 42 may move slightly horizontally within the first insertion hole 24. If the first protrusion 42 moves slightly horizontally within the first insertion hole 24, the first fitting 40 moves horizontally relative to the first beam member 20, and there is a risk that the second beam member 30 may be misaligned relative to the first beam member 20. In this embodiment, the first connecting portion 51 of the second fitting 50 is connected to the lower surface 23 of the first beam member end of the first beam member 20 by the first connecting member 53A, so that the second fitting 50 is less likely to move relative to the first beam member 20. The second connecting portion 52 of the second metal fitting 50 is connected to the first beam member 20 of the second beam member 30 in the horizontal direction, thereby suppressing horizontal movement of the second beam member 30 relative to the first beam member 20.

[0063] The effects of this embodiment will be described. (1) The composite beam 10 includes a first beam member 20 and a second beam member 30. The second beam member 30 is disposed along the first beam member 20 below the lower surface 20Y of the first beam member 20 and is joined to the first beam member 20. In the longitudinal direction X1 of the first beam member 20, the third end face 34 is located on the inner side than the first end face 21, and the fourth end face 35 is located on the inner side than the second end face 22.

[0064] According to this configuration, when the first end face 21 of the first beam member 20 is connected to the structural material 4 constituting the building 1, a space is provided between the structural material 4 and the third end face 34. Or, when the second end face 22 of the first beam member 20 is connected to the structural material 4 constituting the building 1, a space is provided between the structural material 4 and the fourth end face 35. Since the equipment 5 can be placed in the space between the structural material 4 and the third end face 34 or the space between the structural material 4 and the fourth end face 35, the equipment 5 can be suitably placed on the first ceiling 2.

[0065] (2) The first beam member 20 is made of wood, and the second beam member 30 is made of steel. With this configuration, the strength of the composite beam 10 can be improved compared to when the second beam member 30 is made of wood.

[0066] (3) The composite beam 10 further includes a plurality of first fittings 40. The first fittings 40 are connected to the lower surface 20Y of the first beam member 20 and the upper surface 30X of the second beam member 30. According to this configuration, the lower surface 20Y of the first beam member 20 and the upper surface 30X of the second beam member 30 can be connected by the plurality of first fittings 40, so that misalignment between the first beam member 20 and the second beam member 30 can be suitably suppressed.

[0067] (4) The first fitting 40 has a first plate 41, a first protruding portion 42 that is inserted through the first insertion hole 24 of the first beam member 20, and a second protruding portion 43 that is inserted through the second insertion hole 38 of the second beam member 30. With this configuration, the first protruding portion 42 is inserted through the first insertion hole 24 of the first beam member 20 and the second protruding portion 43 is inserted through the second insertion hole 38 of the second beam member 30, so that misalignment between the first beam member 20 and the second beam member 30 can be more suitably suppressed.

[0068] (5) In the longitudinal direction X1 of the first beam member 20, the interval G1 between the first fittings 40 arranged near the ends 11 of the composite beam 10 is narrower than the interval G2 between the first fittings 40 arranged near the central portion 12 of the composite beam 10. With this configuration, the number of first fittings 40 near the central portion 12 of the composite beam 10 can be reduced, thereby making the assembly work of the composite beam 10 more efficient.

[0069] (6) The composite beam 10 further includes a second metal fitting 50. The second metal fitting 50 has a first connecting portion 51 connected to the underside 23 of the first beam member end portion and a second connecting portion 52 connected to the third end surface 34 of the second beam member 30. According to this configuration, the second metal fitting 50 can connect the underside 23 of the first beam member end portion of the underside 20Y of the first beam member 20 to the third end surface 34 of the second beam member 30, thereby preferably suppressing misalignment between the first beam member 20 and the second beam member 30.

[0070] (7) A gap is provided between the lower surface 20Y of the first beam member 20 and the upper surface 30X of the second beam member 30. According to this configuration, air passes through the gap between the lower surface 20Y of the first beam member 20 and the upper surface 30X of the second beam member 30, so moisture is less likely to accumulate between the first beam member 20 and the second beam member 30. Therefore, corrosion of the first beam member 20 and the second beam member 30 can be suppressed.

[0071] (8) The building 1 comprises a structural material 4, a composite beam 10, and equipment 5. The composite beam 10 comprises a first beam member 20 and a second beam member 30. The second beam member 30 is disposed below the lower surface 20Y of the first beam member 20 so as to follow the first beam member 20, and is joined to the first beam member 20. The equipment 5 is disposed between the structural material 4 and the third end surface 34. According to this configuration, the equipment 5 is disposed in the space between the structural material 4 and the third end surface 34. This can prevent a portion of the equipment 5 from protruding downward from the ceiling, or can reduce the dimension of the downward protrusion.

[0072] (9) The building 1 comprises a structural material 4 and a composite beam 10. The composite beam 10 comprises a first beam member 20 and a second beam member 30. The second beam member 30 is disposed below the lower surface 20Y of the first beam member 20 so as to follow the first beam member 20, and is joined to the first beam member 20. An arrangement space SA in which equipment 5 can be disposed is provided between the structural material 4 and the third end surface 34. With this configuration, the equipment 5 can be disposed in the arrangement space SA, and therefore the equipment 5 can be suitably disposed on the first ceiling 2.

[0073] (10) The reinforcing metal fitting 60 is connected to the underside 23 of the first beam member end portion of the underside 20Y of the first beam member 20, and is also connected to the third end face 34. With this configuration, the third end face 34 of the second beam member 30 is connected to the underside 23 of the first beam member end portion by the reinforcing metal fitting 60, so there is no need to connect the third end face 34 to the structural material 4. When the first end face 21 of the first beam member 20 is connected to the structural material 4 of the building 1, the equipment 5 can be placed in the space generated between the structural material 4 and the third end face 34, so the equipment 5 can be suitably placed on the first ceiling 2.

[0074] <Modification> The above embodiments are examples of possible forms of the building, composite beam, and reinforcing metal fittings, and are not intended to limit the forms. The building, composite beam, and reinforcing metal fittings may take forms different from those exemplified in the above embodiments. Examples of such forms include forms in which part of the configuration of the embodiment is replaced, changed, or omitted, or forms in which a new configuration is added to the embodiment. Modified examples of the embodiment are shown below.

[0075] 7, a piping hole 37 may be provided in the first beam member 20. The composite beam 10 of this modified example may include a protective member 70 that protects the first beam member 20. The protective member 70 covers the inside of the piping hole 37 and the periphery of the piping hole 37 so that the piping placed in the piping hole 37 does not come into direct contact with the first beam member 20.

[0076] 1, 8, and 9, the structural member 4 may be a girder 4A, a beam 71, or a column 72. FIG. 8 illustrates a case where the structural member 4 is a beam 71. FIG. 9 illustrates a case where the structural member 4 is a column 72.

[0077] The building 1 does not need to include the equipment 5 as long as it includes the structural members 4 and the composite beams 10. In this modification, after the building 1 is constructed, the equipment 5 can be retrofitted to the arrangement space SA as necessary.

[0078] The second beam member 30 may be made of the same material as the first beam member 20. In this modification, the second beam member 30 may be made of wood.

[0079] In the longitudinal direction X1, the third end face 34 may be located more inward than the first end face 21, and the fourth end face 35 may be located at the same position as the second end face 22 or more outward than the second end face 22. Alternatively, in the longitudinal direction X1, the third end face 34 may be located at the same position as the first end face 21 or more outward than the first end face 21, and the fourth end face 35 may be located more inward than the second end face 22. In this modification, the step portion 13 is provided at either the first end face 11A or the second end face 11B of the composite beam 10.

[0080] All of the first fittings 40 may be arranged with the same interval between them. In the longitudinal direction X1 of the first beam member 20, the interval G1 between the first fittings 40 arranged near the end portion 11 of the composite beam 10 may be the same as the interval G2 between the first fittings 40 arranged near the center portion 12 of the composite beam 10.

[0081] The number of the first fittings 40 may be changed arbitrarily. The number of the first fittings 40 arranged in the central portion 12 of the composite beam 10 may be different from the number of the first fittings 40 arranged in the first end portion 11A or the second end portion 11B of the composite beam 10. As an example, the number of the first fittings 40 may be two, one first fitting 40 may be arranged in the first end portion 11A, one first fitting 40 may be arranged in the second end portion 11B, and no first fitting 40 may be arranged in the central portion 12. As another example, the number of the first fittings 40 may be three, one first fitting 40 may be arranged in the first end portion 11A, one first fitting 40 may be arranged in the central portion 12, and one first fitting 40 may be arranged in the second end portion 11B. As another example, the number of first fittings 40 may be five, with two first fittings 40 disposed at the first end 11A, one first fitting 40 at the central portion 12, and two first fittings 40 at the second end 11B. The number of the multiple first fittings 40 may be ten or more.

[0082] The number of the first fittings 40 may be set according to the length L of the composite beam 10. In one example, when the length L of the composite beam 10 is 6.5 m or more and 7.5 m or less, the number of the first fittings 40 may be 9. In another example, when the length L of the composite beam 10 is 5.5 m or more and 6.5 m or less, the number of the first fittings 40 may be 8.

[0083] The lower surface 20Y of the first beam member 20 and the upper surface 30X of the second beam member 30 may be in contact with each other. In this modification, no gap is provided between the lower surface 20Y of the first beam member 20 and the upper surface 30X of the second beam member 30. In this modification, a groove into which the first plate 41 of the first fitting 40 fits may be provided in the lower surface 20Y of the first beam member 20 or the upper surface 30X of the second beam member 30 so that the lower surface 20Y of the first beam member 20 and the upper surface 30X of the second beam member 30 are in contact with each other.

[0084] Either the first fitting 40 or the second fitting 50 may be omitted. In this modification, the second beam member 30 may be joined to the first beam member 20 by only the other of the first fitting 40 or the second fitting 50.

[0085] The present specification discloses the following techniques: [Appendix 1] A composite beam is a composite beam that forms part of a building's frame, and comprises a first beam member having a first end face and a second end face opposite the first end face in the longitudinal direction, and a second beam member having a third end face and a fourth end face opposite the third end face in the longitudinal direction, wherein the second beam member is positioned below the lower surface of the first beam member and along the first beam member, and is joined to the first beam member, and in the longitudinal direction of the first beam member, the third end face is located more inward than the first end face, and the fourth end face is located more inward than the second end face.

[0086] [Appendix 2] In the composite beam described in Supplementary Note 1, the first beam member is made of wood, and the second beam member is made of steel.

[0087] [Appendix 3] The composite beam described in Appendix 1 further comprises a plurality of first fittings that connect the second beam member to the first beam member, the first fittings being connected to a lower surface of the first beam member and an upper surface of the second beam member.

[0088] [Appendix 4] In the composite beam described in Appendix 3, the first fitting has a first plate arranged between the first beam member and the second beam member, a first protrusion protruding from the first plate so as to pass through a first insertion hole formed in the first beam member, and a second protrusion protruding from the first plate so as to pass through a second insertion hole formed in the second beam member.

[0089] [Appendix 5] In the composite beam described in Appendix 3, in the longitudinal direction of the first beam member, the distance between first fittings arranged near the ends of the composite beam is narrower than the distance between first fittings arranged near the center of the composite beam.

[0090] [Appendix 6] The composite beam described in Appendix 1 further includes a second fitting, the second fitting having a first connecting portion connected to an underside of an end portion of the first beam member located between the first end face and the third end face in the longitudinal direction of the first beam member, and a second connecting portion connected to the third end face of the second beam member.

[0091] [Appendix 7] In the composite beam described in Supplementary Note 1, a gap is provided between the lower surface of the first beam member and the upper surface of the second beam member.

[0092] [Appendix 8] The building is a building comprising a structural material which is a beam, girder, or column, a composite beam connected to the structural material, and equipment arranged near the end of the composite beam, wherein the composite beam comprises a first beam member having a first end face connected to a side of the structural material, and a second beam member having a third end face facing the side of the structural material, the second beam member being arranged along the first beam member below the lower surface of the first beam member and being connected to the first beam member, and the equipment being arranged between the structural material and the third end face.

[0093] [Appendix 9] The building is a building comprising a structural material which is a beam, girder, or column, and a composite beam connected to the structural material, the composite beam comprising a first beam member having a first end face connected to a side of the structural material, and a second beam member having a third end face facing the side of the structural material, the second beam member being arranged along the first beam member below the lower surface of the first beam member and being connected to the first beam member, and an arrangement space in which equipment can be arranged is provided between the structural material and the third end face.

[0094] [Appendix 10] The reinforcing bracket is a reinforcing bracket provided on a composite beam, the composite beam comprising a first beam member having a first end face and a second end face opposite the first end face in the longitudinal direction, and a second beam member having a third end face and a fourth end face opposite the third end face in the longitudinal direction, the second beam member being arranged below the lower surface of the first beam member and along the first beam member, the third end face being located more inward than the first end face in the longitudinal direction of the first beam member, and being joined to the lower surface of the first beam member end portion located between the first end face and the third end face in the longitudinal direction of the first beam member, and also to the third end face. [Explanation of symbols]

[0095] 1...building, 4...structural material, 4A...girder, 5...equipment, 10...composite beam, 11...end, 12...center, 20...first beam member, 21...first end face, 22...second end face, 23...underside of first beam member end, 24...first insertion hole, 30...second beam member, 34...third end face, 35...fourth end face, 38...second insertion hole, 40, 40A, 40B, 40C...first metal fitting, 41...first plate, 42...first protrusion, 43...second protrusion, 50...second metal fitting, 51...first joint, 52...second joint, 60...reinforcement metal fitting, 71...beam, 72...column.

Claims

1. A composite beam that constitutes part of the framework of a building, A first beam member having a first end surface and a second end surface opposite to the first end surface in a longitudinal direction; a second beam member having a third end surface and a fourth end surface opposite the third end surface in the longitudinal direction; The second beam member is disposed along the first beam member below a lower surface of the first beam member and is coupled to the first beam member; In the longitudinal direction of the first beam member, the third end surface is located more inward than the first end surface, and the fourth end surface is located more inward than the second end surface. Composite beam.

2. The first beam member is made of wood, The second beam member is made of steel. The composite beam of claim 1 .

3. a plurality of first fittings for connecting the second beam member to the first beam member; The first metal fitting is connected to a lower surface of the first beam member and an upper surface of the second beam member. The composite beam of claim 1 .

4. The first fitting is A first plate disposed between the first beam member and the second beam member; a first protruding portion protruding from the first plate so as to pass through a first insertion hole formed in the first beam member; a second protruding portion protruding from the first plate so as to pass through a second insertion hole formed in the second beam member; The composite beam of claim 3.

5. In the longitudinal direction of the first beam member, a distance between the first metal fittings arranged near the ends of the composite beam is narrower than a distance between the first metal fittings arranged near the center of the composite beam. The composite beam of claim 3.

6. Further comprising a second fitting; The second fitting is a first connecting portion connected to a lower surface of a first beam member end portion located between the first end surface and the third end surface in the longitudinal direction of the first beam member, among the lower surfaces of the first beam member; A second connecting portion connected to the third end surface of the second beam member. The composite beam of claim 1 .

7. A gap is provided between a lower surface of the first beam member and an upper surface of the second beam member. The composite beam of claim 1 .

8. A building, A structural member that is a girder, beam, or column; A composite beam connected to the structural member; and a facility disposed near an end of the composite beam, The composite beam comprises: A first beam member having a first end surface connected to a side surface of the structural material; a second beam member having a third end surface facing the side surface of the structural material; The second beam member is disposed along the first beam member below a lower surface of the first beam member and is coupled to the first beam member; The facility is disposed between the structural member and the third end surface. architecture.

9. A building, A structural member that is a girder, beam, or column; a composite beam connected to the structural member; The composite beam comprises: A first beam member having a first end surface connected to a side surface of the structural material; a second beam member having a third end surface facing the side surface of the structural material; The second beam member is disposed along the first beam member below a lower surface of the first beam member and is coupled to the first beam member; An arrangement space in which equipment can be arranged is provided between the structural member and the third end surface. architecture.

10. A reinforcing bracket provided on a composite beam, The composite beam comprises: A first beam member having a first end surface and a second end surface opposite to the first end surface in a longitudinal direction; a second beam member having a third end surface and a fourth end surface opposite the third end surface in the longitudinal direction; the second beam member is disposed below a lower surface of the first beam member and along the first beam member; In the longitudinal direction of the first beam member, the third end surface is located more inward than the first end surface, a lower surface of the first beam member that is connected to a lower surface of an end portion of the first beam member that is located between the first end surface and the third end surface in the longitudinal direction of the first beam member, and is also connected to the third end surface; Reinforcement bracket.

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