Composite beam

Abstract

To provide a beam suitable for a mid-to-high-rise building.SOLUTION: A composite beam 100 constituted by a steel material and a timber includes: a steel beam 110 comprising a shape steel having a web 113; a pair of wooden reinforcement materials 120 provided along the length direction of the steel beam 110 and sandwiching the web 113; and connection means 130 for integrally connecting the steel beam 110 and the pair of wooden reinforcement materials 120. At the wooden reinforcement material 120, a through-hole 121 is formed penetrating in the width direction of the steel beam 110. The connection means 130 includes: a metallic material (truncated cone-like metallic material 140) having a first contact surface which is the contact surface with the web 113 and a second contact surface which is the contact surface with a side wall in the through-hole 121 of the wooden reinforcement material 120; and a high strength bolt 150 provided across the through-holes 121 in the pair of wooden reinforcement materials 120. By the high strength bolt 150, the metallic material (truncated cone-like metallic material 140) and the web 113 are joined.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to composite beams. [Background technology]

[0002] Patent Document 1 discloses a building having a steel frame structure, in which steel beams made of H-shaped steel are used as beams. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-14692 Summary of the Invention [Problem to be solved by the invention]

[0004] In particular, in the case of buildings with many floors, such as mid- to high-rise buildings, it is desirable to use beams that are stronger than steel beams. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a beam suitable for mid- to high-rise buildings. [Means for solving the problem]

[0005] The invention described in claim 1 is, for example, as shown in Figs. 1 to 12, a composite beam 100, 200, 300, 400 made of steel and wood, Steel beams 110, 210, 310, 410 made of shaped steel having webs 113, 213, 313, 413; a pair of wooden reinforcing members 120, 220, 320, 420 provided along the longitudinal direction of the steel beams 110, 210, 310, 410 and sandwiching the webs 113, 213, 313, 413; and connecting means 130, 230, 330, 430 that integrally connect the steel beams 110, 210, 310, 410 and the pair of wooden reinforcing members 120, 220, 320, 420, The wooden reinforcement members 120, 220, 320, 420 are formed with through holes 121, 221, 321, 421 that penetrate the steel beams 110, 210, 310, 410 in the width direction, The connecting means 130, 230, 330, 430 are A metal fitting (a truncated cone metal fitting 140, 240, 340, a cylindrical metal fitting 260, 360, a columnar metal fitting 440) having a first contact surface that is a contact surface with the web 113, 213, 313, 413 and a second contact surface that is a contact surface with the side wall of the through hole 121, 221, 321, 421 of the wood reinforcement material 120, 220, 320, 420; and high-strength bolts (150, 250, 350, 450) provided across the through holes (121, 221, 321, 421) in the pair of wood reinforcement members (120, 220, 320, 420), The metal fittings (frustum-shaped metal fittings 140, cylindrical metal fittings 260, 360, columnar metal fittings 440) and the webs 113, 213, 313, 413 are joined by the high-strength bolts 150, 250, 350, 450.

[0006] According to the invention described in claim 1, the composite beams 100, 200, 300, 400 are steel beams 110, 210, 310, 410 reinforced by a pair of wooden reinforcing members 120, 220, 320, 420, and are therefore stronger than steel beams and suitable for mid- to high-rise buildings.

[0007] The invention described in claim 2 is, for example, as shown in Figs. 1 to 7, in the composite beams 100, 200, 300 described in claim 1, The second contact surface is characterized by being a truncated cone surface that widens from the web (113, 213, 313) side toward the opposite side of the web (113, 213, 313).

[0008] According to the invention described in claim 2, since the second contact surface of the metal fittings (frustum-shaped metal fittings 140, 240, 340) is a truncated cone surface, tightening the high-strength bolts 150, 250, 350 pulls the wood reinforcement members 120, 220, 320 to a fixed position. In other words, tightening the high-strength bolts 150, 250, 350 makes it possible to press the wood reinforcement members 120, 220, 320 against the webs 113, 213, 313. Therefore, it is possible to integrate the steel beams 110, 210, 310 and the wood reinforcement members 120, 220, 320 using only the connecting means 130, 230, 330, without using adhesives or the like.

[0009] The invention described in claim 3 is, for example, as shown in Figs. 1 to 5, in the composite beams 100 and 200 described in claim 2, The through holes 121, 221 include truncated cone-shaped hole portions 122, 222, The connecting means 130, 230 includes, as the metal part, a truncated cone-shaped metal part 140, 240 having a top surface part 142, 242 in which a bolt hole (second bolt hole 143, 243) into which the high-strength bolt 150, 250 is inserted, and a side surface part 141, 241 that is thinner than the top surface part 142, 242, a surface of the side surface portion 141, 241 is the second contact surface which is a contact surface with the side wall of the truncated conical hole portion 122, 222; Before the high-strength bolts 150 and 250 are tightened, the side surface portions 141 and 241 have a larger inclination angle than the side walls of the truncated conical hole portions 122 and 222 .

[0010] According to the invention described in claim 3, by tightening the high-strength bolts 150, 250, the side surfaces 141, 241 can be deformed, and the inclination angle of the side surfaces 141, 241 can be made to match the inclination angle of the side walls. Therefore, by tightening the high-strength bolts 150, 250, the wood reinforcements 120, 220 can be reliably pulled to a fixed position, allowing the function of the second contact surface (the function of pressing the wood reinforcements 120, 220 against the webs 113, 213) to be effectively exerted.

[0011] The invention described in claim 4 is, for example, as shown in Figs. 1 to 5, in the composite beams 100 and 200 described in claim 2, The through holes 121, 221 include truncated cone-shaped hole portions 122, 222, The connecting means 130, 230 includes, as the metal part, a truncated cone-shaped metal part 140, 240 having a side part 141, 241 and a top part 142, 242 in which a bolt hole (second bolt hole 143, 243) into which the high-strength bolt 150, 250 is inserted is formed, a surface of the side surface portion 141, 241 is the second contact surface which is a contact surface with the side wall of the truncated conical hole portion 122, 222; Before the high-strength bolts 150 and 250 are tightened, the diameter D4 of the top surface portions 142 and 242 is It is characterized in that the diameter is larger than the diameter D2 of the truncated cone-shaped hole portions 122, 222 on the web 113, 213 side.

[0012] According to the invention described in claim 4, by tightening the high-strength bolts 150, 250, the side walls of the truncated conical holes 122, 222 are deformed, and the inclination angle of the side walls can be made to match the inclination angle of the side surfaces 141, 241. Therefore, by tightening the high-strength bolts 150, 250, the wood reinforcement members 120, 220 can be reliably pulled to a fixed position, thereby enabling the function of the second contact surface (the function of pressing the wood reinforcement members 120, 220 against the webs 113, 213) to be effectively exerted.

[0013] The invention described in claim 5 is, for example, as shown in Figs. 4 and 5, in the composite beam 200 described in claim 3 or 4, the through-hole 221 includes the truncated conical hole portion 222 and a cylindrical hole portion 223 that is formed closer to the web 213 than the truncated conical hole portion 222 and communicates with the truncated conical hole portion 222; The connecting means 230 includes, as the metal parts, the truncated cone-shaped metal part 240 provided in the truncated cone-shaped hole part 222 and a cylindrical metal part 260 inserted into the cylindrical hole part 223, The diameter of the cylindrical hole 223 is the same as the diameter D2 of the truncated cone hole 222 on the web 213 side.

[0014] According to the fifth aspect of the invention, the through-holes 221 can be easily formed.

[0015] The invention described in claim 6 is, for example, as shown in Figs. 4 and 5, in the composite beam 200 described in claim 5, The length L4 of the cylindrical metal fitting 260 is It is set to be longer than the length dimension L2 of the cylindrical hole portion 223, and This is characterized in that, after the high-strength bolt 250 is tightened, the second contact surface (the surface (outer surface) of the side portion 241) is set shorter than the dimension at which it comes into contact with the side wall of the truncated conical hole portion 222.

[0016] According to the sixth aspect of the present invention, the length L4 of the cylindrical metal fitting 260 is set to an appropriate value. Therefore, even if the cylindrical hole 223 that communicates with the truncated conical hole 222 is provided closer to the web 213 than the truncated conical hole 222, the wood reinforcement 220 can be reliably pulled to a certain position by tightening the high-strength bolt 250, thereby allowing the function of the second contact surface (the function of pressing the wood reinforcement 220 against the web 213) to be effectively exerted.

[0017] The invention described in claim 7 is, for example, as shown in Figs. 6 and 7, in the composite beam 300 described in claim 2, The through hole 321 includes a truncated cone-shaped hole portion 322, The connecting means 330 includes, as the metal part, a truncated cone-shaped metal part 340 having a solid metal body and a bolt hole (second bolt hole 343) into which the high-strength bolt 350 is inserted, The side surface of the truncated cone-shaped metal piece 340 is the second contact surface, which is the contact surface with the side wall of the truncated cone-shaped hole portion 322, Before the high-strength bolt 350 is tightened, the side surface of the truncated cone-shaped metal piece 340 has a larger inclination angle than the side wall of the truncated cone-shaped hole portion 322 .

[0018] According to the invention described in claim 7, by tightening the high-strength bolt 350, the side wall of the truncated conical hole 322 can be deformed, and the inclination angle of the side wall can be made to match the inclination angle of the side surface of the truncated conical metal fitting 340. Therefore, the side wall of the truncated conical hole 322 and the second contact surface (the side surface of the truncated conical metal fitting 340) are in tight contact with each other, and the second contact surface can effectively press the wood reinforcement 320 against the web 313.

[0019] The invention described in claim 8 is, for example, as shown in Figs. 8 to 12, in the composite beam 400 described in claim 1, the second contact surface is a cylindrical surface having the same diameter on the side of the web 413 and the opposite side of the web 413, The connecting means 430 includes the metal fitting (cylindrical metal fitting 440), the high-strength bolt 450, and a second bolt 470. The second bolt 470 connects the wood reinforcement material 420 and the web 413 together.

[0020] According to the invention described in claim 8, the second bolt 470 can press the wooden reinforcement 420 against the web 413. Therefore, the steel beam 410 and the wooden reinforcement 420 can be integrated with each other using only the connecting means 430, without using adhesives or the like. [Effects of the Invention]

[0021] According to the present invention, a beam suitable for mid- to high-rise buildings can be provided. [Brief explanation of the drawings]

[0022] [Figure 1] First embodiment: a perspective view showing an example of a composite beam. [Figure 2] First embodiment: A cross-sectional view showing an example of a composite beam. [Figure 3] First embodiment: an exploded cross-sectional view showing an example of a composite beam. [Figure 4] Second embodiment: A cross-sectional view showing an example of a composite beam. [Figure 5] Second embodiment: an exploded cross-sectional view showing an example of a composite beam. [Figure 6] Third embodiment: A cross-sectional view showing an example of a composite beam. [Figure 7] Third embodiment: an exploded cross-sectional view showing an example of a composite beam. [Figure 8] Fourth embodiment: a front view showing an example of a composite beam. [Figure 9] Fourth embodiment: A diagram showing an example of a composite beam, which is a cross-sectional view taken along line AA in FIG. [Figure 10] Fourth embodiment: a diagram showing an example of a composite beam, and an exploded cross-sectional view taken along line AA in FIG. [Figure 11] Fourth embodiment: a diagram showing an example of a composite beam, which is a cross-sectional view taken along line BB in FIG. [Figure 12] Fourth embodiment: a diagram showing an example of a composite beam, and an exploded cross-sectional view taken along line BB in FIG. 8. DETAILED DESCRIPTION OF THE INVENTION

[0023] Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the embodiments described below are subject to various limitations that are technically preferable for carrying out the present invention, but the technical scope of the present invention is not limited to the following embodiments and illustrated examples. Note that directions (front-back, left-right, up-down) in the following embodiments and illustrated examples are set solely for the convenience of explanation.

[0024] In the following description, when ordinal numbers such as "first" and "second" are attached to common names, the ordinal numbers are used only to identify the objects to which they are attached. They do not limit the objects to which they are attached to a specific object, and they do not specify the order, rank, order, hierarchy, priority, or subordination of the objects to which they are attached.

[0025] First Embodiment 《Composite beam》 Fig. 1 is a perspective view showing an example of a composite beam 100. Fig. 2 is a cross-sectional view showing an example of the composite beam 100. Fig. 3 is an exploded cross-sectional view showing an example of the composite beam 100. The composite beam 100 is a beam made of steel and wood. Specifically, as shown in Figures 1 to 3, the composite beam 100 is composed of a steel beam 110, two wooden reinforcing members 120 that reinforce the steel beam 110, and a connecting means 130 that connects the steel beam 110 and the two wooden reinforcing members 120.

[0026] Steel beam The steel beam 110 is made of an H-shaped steel. That is, the steel beam 110 has an upper flange 111, a lower flange 112, and a web 113. Note that the shaped steel (steel material) that makes up the steel beam 110 is not limited to the H-shaped steel, and may be any shaped steel having the web 113. The web 113 is formed with a plurality of first bolt holes 114 that penetrate the thickness direction (front-rear direction) of the web 113. The plurality of first bolt holes 114 are provided at predetermined intervals in the length direction (left-right direction) of the steel beam 110. The diameter D1 of the first bolt hole 114 is set to a diameter that allows insertion of a high-strength bolt 150, which will be described later. In this embodiment, the diameter D1 of the first bolt hole 114 is set to 13 mm, but is not limited to this.

[0027] <Wood reinforcement material> The wooden reinforcing material 120 is made of laminated wood. Note that the wooden material (wood) that makes up the wooden reinforcing material 120 is not limited to laminated wood, and may be other types of wooden material, such as solid wood or LVL (Laminated Veneer Lumber). The wooden reinforcement 120 is provided along the length of the steel beam 110 and is attached to the steel beam 110 with its bottom surface in contact with the bottom flange 112 of the steel beam 110 and one of its surfaces (both surfaces in the thickness direction (front-to-back direction) of the wooden reinforcement 120) in contact with the web 113 of the steel beam 110. In other words, the two wooden reinforcements 120 sandwich the web 113.

[0028] The height dimension (vertical dimension) of the wood reinforcement 120 is set shorter than the height dimension of the web 113 of the steel beam 110 (the distance between the upper flange 111 and the lower flange 112 of the steel beam 110). The length (dimension in the left-right direction) of the wood reinforcement material 120 is set to be shorter than the length of the steel beam 110. The thickness dimension (front-to-back dimension) of the wood reinforcement material 120 is set so that one of its surfaces contacts the web 113 of the steel beam 110 and the other surface is positioned outside the flanges 111, 112 of the steel beam 110 (opposite the web 113).

[0029] The wood reinforcement material 120 has a plurality of through holes 121 formed therein that penetrate the wood reinforcement material 120 in the thickness direction (front-rear direction). The plurality of through holes 121 are provided at predetermined intervals in the length direction (left-right direction) of the wood reinforcement material 120, corresponding to each of the first bolt holes 114 of the steel beam 110. The through-hole 121 is made up of a truncated conical hole portion 122 and a cylindrical hole portion 123 which communicate with each other.

[0030] The truncated cone-shaped hole 122 is formed in the portion of the wood reinforcement material 120 on the web 113 side so that the height direction (the height direction of the truncated cone, i.e., the direction perpendicular to the top and bottom surfaces of the truncated cone) is parallel to the thickness direction of the wood reinforcement material 120, and so that the top surface (the top surface of the truncated cone) is located closer to the web 113 than the bottom surface (the bottom surface of the truncated cone). In addition, the cylindrical hole portion 123 is formed on the part of the wood reinforcement material 120 opposite the web 113 so that its height direction (the height direction of the cylinder, i.e., the direction perpendicular to the top and bottom surfaces of the cylinder) is parallel to the thickness direction of the wood reinforcement material 120 and so as to be continuous with the bottom surface of the truncated cone hole portion 122. Therefore, the diameter D2 of the through hole 121 on the side facing the web 113 is different from the diameter D3 of the through hole 121 on the side opposite the web 113. Specifically, the diameter D2 of the through hole 121 on the side facing the web 113 is smaller than the diameter D3 of the through hole 121 on the side opposite the web 113.

[0031] Diameter D2 of through hole 121 on the web 113 side, ie, the diameter of the top surface of truncated conical hole portion 122, is set larger than diameter D1 of first bolt hole 114 in web 113 (D2>D1). The diameter D3 of the through hole 121 on the side opposite the web 113, i.e., the diameter of the bottom surface of the truncated cone-shaped hole portion 122, and the diameter of the cylindrical hole portion 123 (the diameter of the top and bottom surfaces of the cylindrical hole portion 123) are set larger than the diameter D2 of the through hole 121 on the web 113 side (D3>D2). Furthermore, the distance L1 from the bottom surface to the top surface of the truncated cone-shaped hole portion 122 in the through-hole 121 is set to be longer than the distance L2 from the bottom surface to the top surface of the cylindrical hole portion 123 in the through-hole 121 (L1>L2).

[0032] 《Connection means》 The connecting means 130 is configured to include two truncated cone-shaped metal members 140 and a high-strength bolt 150 . The truncated cone-shaped metal member 140 is a metal member in the shape of a hollow truncated cone with an open bottom and a closed top. That is, the truncated cone-shaped metal member 140 has a side portion 141 and a top portion 142. In the connecting means 130, the surface (outer surface) of the top portion 142 is the contact surface (first contact surface) with the web 113, and the surface (outer surface) of the side portion 141 is the contact surface (second contact surface) with the side wall of the through hole 121 of the wood reinforcement material 120.

[0033] The diameter D4 of the top surface of the truncated cone-shaped metal fitting 140 is set to be larger than the diameter D1 of the first bolt hole 114 in the web 113 and smaller than the diameter D2 of the through hole 121 of the wood reinforcement material 120 on the web 113 side (slightly smaller than the diameter D2) (D1 <D4<D2)。 In this embodiment, the diameter D2 of the through-hole 121 on the side of the web 113 is set to 39 mm, but is not limited to this. In addition, in this embodiment, the diameter D4 of the top surface of the truncated cone-shaped metal fitting 140 is set to 38 mm, but this is not limited to this.

[0034] The diameter D5 of the bottom surface of the truncated cone-shaped metal fitting 140 is set smaller than the diameter D3 of the through-hole 121 of the wood reinforcement material 120 on the side opposite to the web 113 (D5 <D3)。 The distance L3 from the bottom surface to the top surface of the truncated cone-shaped metal fitting 140 is set to be shorter than the distance L1 from the bottom surface to the top surface of the truncated cone-shaped hole portion 122 of the through-hole 121 (L3 <L1)。 Furthermore, the distance L3 from the bottom surface to the top surface of the truncated cone-shaped metal piece 140 is set to be longer than the distance L2 from the bottom surface to the top surface of the cylindrical hole portion 123 of the through-hole 121 (L3>L2).

[0035] Furthermore, before the truncated cone-shaped metal fitting 140 is placed in the through hole 121 of the wood reinforcement material 120, the inclination angle θ2 of the side portion 141 of the truncated cone-shaped metal fitting 140 is set to be larger than the inclination angle θ1 of the side wall at the truncated cone-shaped hole portion 122 of the through hole 121 (slightly larger than the inclination angle θ1) (θ2>θ1). In this embodiment, the inclination angle θ2 of the side surface 141 of the truncated cone-shaped metal fitting 140 before being placed in the through hole 121 of the wood reinforcement material 120 is set to 30°, but this is not limited to this.

[0036] In the truncated cone-shaped metal piece 140, the side surface portion 141 is thinner than the top surface portion 142. In this embodiment, the side surface portion 141 is formed from a steel plate having a thickness of 1.6 mm, but is not limited to this. In addition, in this embodiment, the top surface portion 142 is formed from a steel plate having a thickness of 3.2 mm, but this is not limitative. The truncated cone-shaped metal piece 140 of this embodiment is manufactured by welding a side surface portion 141 and a top surface portion 142 together.

[0037] A second bolt hole 143 is formed in the top surface portion 142 of the truncated cone-shaped metal fitting 140, penetrating the top surface portion 142 in the thickness direction (front-rear direction). The diameter D6 of the second bolt hole 143 is set to a diameter that allows the insertion of the high-strength bolt 150. In this embodiment, the diameter D6 of the second bolt hole 143 is set to be equal to the diameter D1 of the first bolt hole 114 in the web 113 (D6=D1).

[0038] A high-strength bolt (high-tensile bolt) 150 is used as a set with a nut 151 and two washers 152 . In this embodiment, the diameter (nominal diameter) of the shaft of the high-strength bolt 150 is set to 12 mm, but is not limited to this. In addition, in this embodiment, the length of the shank of the high-strength bolt 150 is set to 35 mm, but this is not limited to this.

[0039] When the wooden reinforcement material 120 is placed in a predetermined position on the lower flange 112 of the steel beam 110, the center line of the first bolt hole 114 in the steel beam 110 and the center line of the through hole 121 in the wooden reinforcement material 120 coincide with each other. Also, when the frustum-shaped metal object 140 of the connecting means 130 is disposed in the through hole 121 in the wooden reinforcing member 120, the center line of the through hole 121 in the wooden reinforcing member 120 and the center line of the second bolt hole 143 in the frustum-shaped metal object 140 are made to coincide with each other.

[0040] Of the two wooden reinforcing members 120, one wooden reinforcing member 120 is placed at a predetermined position in the front part of the lower flange 112, and the other wooden reinforcing member 120 is placed at a predetermined position in the rear part of the lower flange 112. Also, of the two frustum-shaped metal objects 140, one frustum-shaped metal object 140 is disposed in the through hole 121 in one wooden reinforcing member 120, and the other frustum-shaped metal object 140 is disposed in the through hole 121 in the other wooden reinforcing member 120. In that state, a high-strength bolt 150 is inserted from the through hole 121 in one wooden reinforcing member 120 toward the through hole 121 in the other wooden reinforcing member 120, and a nut 151 is screwed onto the shaft portion of the high-strength bolt 150 from the side of the through hole 121 in the other wooden reinforcing member 120. Specifically, the high-strength bolt 150 is passed through one washer 152, the second bolt hole 143 in one frustum-shaped metal object 140, the first bolt hole 114 in the web 113, the second bolt hole 143 in the other frustum-shaped metal object 140, and the other washer 152, and the nut 151 is screwed onto the shaft portion of the high-strength bolt 150. Thereby, the steel beam 110 and the two wooden reinforcing members 120 are integrally connected by the connecting means 130.

[0041] The diameter D4 of the top surface of the frustum-shaped metal object 140 is set smaller than the diameter D2 on the web 113 side in the through hole 121 of the wooden reinforcing member 120 (D4 < D2). Therefore, in the state where the steel beam 110 and the two wooden reinforcing members 120 are connected by the connecting means 130, the web 113 of the steel beam 110 and the surface (outer surface) of the top surface portion 142 of the frustum-shaped metal object 140 are in contact with each other. Furthermore, in this embodiment, the web 113 and the truncated cone-shaped metal fitting 140 are joined by high-strength bolts 150. Therefore, when the steel beam 110 and the two wooden reinforcements 120 are connected by the connecting means 130, the web 113 of the steel beam 110 and the surface (outer surface) of the top surface 142 of the truncated cone-shaped metal fitting 140 are frictionally joined.

[0042] Furthermore, the surface (outer surface) of the side portion 141 of the truncated cone-shaped metal fitting 140 is the contact surface (second contact surface) with the side wall of the through hole 121 of the wooden reinforcement 120, and is a truncated cone surface that widens from the web 113 side toward the opposite side of the web 113. Therefore, when the steel beam 110 and the two wooden reinforcements 120 are connected by the connecting means 130, the side portion 141 in contact with the wooden reinforcement 120 presses the wooden reinforcement 120 against the web 113. Furthermore, before the truncated conical metal fitting 140 is placed in the through hole 121, the inclination angle θ2 of the side surface portion 141 of the truncated conical metal fitting 140 is greater than the inclination angle θ1 of the side wall of the truncated conical hole portion 122 of the through hole 121 (θ2 > θ1). Furthermore, in the truncated conical metal fitting 140, the side surface portion 141 is thinner than the top surface portion 142. Therefore, as the nut 151 is tightened onto the high-strength bolt 150, the side surface portion 141 is deformed so that the inclination angle of the side surface portion 141 matches the inclination angle θ1 of the side wall of the truncated conical hole portion 122. In other words, when the steel beam 110 and the two wood reinforcements 120 are connected by the connecting means 130, the side wall of the truncated conical hole portion 122 and the surface (outer surface) of the side surface portion 141 come into tight contact with each other. This allows the side portions 141 to effectively press the wood reinforcing material 120 against the web 113. In this way, in the composite beam 100 of this embodiment, the steel beam 110 and the two wooden reinforcing members 120 can be integrated together using only the connecting means 130, without using adhesives or the like.

[0043] "effect" According to the first embodiment, the following excellent effects are achieved. The composite beam 100 in the first embodiment is a composite beam made of steel and wood, and includes a steel beam 110 made of shaped steel having a web 113, a pair of wooden reinforcing members 120 arranged along the length direction (left-right direction) of the steel beam 110 and sandwiching the web 113, and a connecting means 130 that integrally connects the steel beam 110 and the pair of wooden reinforcing members 120. The wooden reinforcing members 120 have a through hole that penetrates the steel beam 110 in the width direction (front-rear direction). A through hole 121 is formed, and the connecting means 130 comprises a metal piece (frustum-shaped metal piece 140) having a first contact surface which is the contact surface with the web 113 and a second contact surface which is the contact surface with the side wall of the through hole 121 of the wood reinforcement material 120, and a high-strength bolt 150 which is installed across the through holes 221 in the pair of wood reinforcement materials 120, and the metal piece (frustum-shaped metal piece 140) and the web 113 are joined by the high-strength bolt 150.

[0044] Therefore, the composite beam 100 is a steel beam 110 reinforced by a pair of wooden reinforcing members 120, and is therefore stronger than a steel beam and suitable for mid- to high-rise buildings. Furthermore, the connecting means 130 includes a metal piece (a truncated cone-shaped metal piece 140) that is joined to the web 113 while contacting the side wall of the through-hole 121 of the wooden reinforcement material 120. Therefore, the metal piece can protect the through-hole 121 while preventing the wooden reinforcement material 120 from shifting position relative to the steel beam 110, so that the reinforcement state provided by the wooden reinforcement material 120 can be stably maintained.

[0045] In addition, in the composite beam 100 of the first embodiment, the second contact surface (surface (outer surface) of the side portion 141) can be a truncated cone surface that widens from the web 113 side toward the opposite side of the web 113.

[0046] With this configuration, the second contact surface (the surface (outer surface) of the side portion 141) of the metal fitting (frustum-shaped metal fitting 140) is a truncated cone surface, so that tightening the high-strength bolt 150 pulls the wood reinforcement 120 to a certain position. In other words, tightening the high-strength bolt 150 makes it possible to press the wood reinforcement 120 against the web 113. Therefore, it is possible to integrate the steel beam 110 and the wood reinforcement 120 using only the connecting means 130, without using adhesives or the like.

[0047] In addition, in the composite beam 100 of the first embodiment, the through hole 121 includes a truncated conical hole portion 122, and the connecting means 130 is configured to include a truncated conical metal member 140 as the metal member, which has a top surface portion 142 in which a bolt hole (second bolt hole 143) through which a high-strength bolt 150 is inserted and a side surface portion 141 that is thinner than the top surface portion 142, and the surface of the side surface portion 141 is configured to be a second contact surface that is a contact surface with the side wall in the truncated conical hole portion 122, and before the high-strength bolt 150 is tightened, the inclination angle θ2 of the side surface portion 141 can be made larger than the inclination angle θ1 of the side wall in the truncated conical hole portion 122.

[0048] With this configuration, tightening the high-strength bolt 150 deforms the side surface 141, making it possible to match the inclination angle of the side surface 141 with the inclination angle θ1 of the side wall. This allows the wood reinforcement 120 to be reliably pulled to a fixed position by tightening the high-strength bolt 150, making it possible to effectively perform the function of the second contact surface (the function of pressing the wood reinforcement 120 against the web 113).

[0049] In the first embodiment, in order to draw the wood reinforcement material 120 to a fixed position by tightening the high-strength bolt 150, the inclination angle θ2 of the side surface 141 of the truncated cone-shaped metal fitting 140 was set larger than the inclination angle θ1 of the side wall of the truncated cone-shaped hole 122 (θ2 > θ1) before tightening the high-strength bolt 150. However, this is not limited to this. In order to draw the wood reinforcement material 120 to a fixed position by tightening the high-strength bolt 150, for example, the diameter D4 of the top surface of the truncated cone-shaped metal fitting 140 (diameter D4 of the top surface 142) may be set larger than the diameter D2 of the web 113 side of the through-hole 121 (diameter D2 of the web 113 side of the truncated cone-shaped hole 122) before tightening the high-strength bolt 150 (D4 > D2).

[0050] By making the diameter D4 of the top surface of the truncated cone-shaped metal fitting 140 larger than the diameter D2 of the through-hole 121 on the web 113 side, as the nut 151 is tightened onto the high-strength bolt 150, the side wall of the truncated cone-shaped hole 122 is scraped away and the truncated cone-shaped hole 122 is deformed so that the diameter D2 of the through-hole 121 on the web 113 side matches the diameter D4 of the top surface of the truncated cone-shaped metal fitting 140. In other words, when the steel beam 110 and the two wooden reinforcements 120 are connected by the connecting means 130, the side wall of the truncated cone-shaped hole 122 (at least the portion of the side wall facing the web 113) and the surface of the side surface 141 (at least the portion of the surface facing the web 113) are in tight contact with each other. This allows the side surface 141 to effectively press the wooden reinforcement 120 against the web 113.

[0051] Furthermore, before the high-strength bolt 150 is tightened, if the diameter D4 of the top surface of the truncated cone-shaped metal fitting 140 (diameter D4 of the top surface portion 142) is larger than the diameter D2 on the web 113 side of the through hole 121 (diameter D2 on the web 113 side of the truncated cone-shaped hole portion 122) (D4>D2), the inclination angle θ2 of the side portion 141 of the truncated cone-shaped metal fitting 140 may be larger than the inclination angle θ1 of the side wall of the truncated cone-shaped hole portion 122 (θ2>θ1), may be the same as the inclination angle θ1 of the side wall of the truncated cone-shaped hole portion 122 (θ2=θ1), or may be smaller than the inclination angle θ1 of the side wall of the truncated cone-shaped hole portion 122 (θ2<θ1). Furthermore, before the high-strength bolt 150 is tightened, if the inclination angle θ2 of the side surface portion 141 of the truncated cone-shaped metal fitting 140 is larger than the inclination angle θ1 of the side wall of the truncated cone-shaped hole portion 122 (θ2>θ1), the diameter D4 of the top surface of the truncated cone-shaped metal fitting 140 (diameter D4 of the top surface portion 142) may be larger than the diameter D2 on the web 113 side of the through hole 121 (diameter D2 on the web 113 side of the truncated cone-shaped hole portion 122) (D4>D2), or may be the same as the diameter D2 on the web 113 side of the through hole 121 (diameter D2 on the web 113 side of the truncated cone-shaped hole portion 122) (D4=D2), or may be smaller than the diameter D2 on the web 113 side of the through hole 121 (diameter D2 on the web 113 side of the truncated cone-shaped hole portion 122) (D4 <D2)。

[0052] Second Embodiment 《Composite beam》 Fig. 4 is a cross-sectional view showing an example of a composite beam 200 according to the second embodiment. Fig. 5 is an exploded cross-sectional view showing an example of a composite beam 200 according to the second embodiment. The composite beam 200 is a beam made of steel and wood. Specifically, as shown in Figures 4 and 5, the composite beam 200 is composed of a steel beam 210, two wooden reinforcing members 220 that reinforce the steel beam 210, and a connecting means 230 that connects the steel beam 210 and the two wooden reinforcing members 220.

[0053] Steel beam The steel beam 210 is made of an H-shaped steel. That is, the steel beam 210 has an upper flange 211, a lower flange 212, and a web 213. Note that the shaped steel (steel material) that makes up the steel beam 210 is not limited to the H-shaped steel, and may be any shaped steel having the web 213. The web 213 is formed with a plurality of first bolt holes 214 penetrating in the thickness direction (front-rear direction) of the web 213. The plurality of first bolt holes 214 are provided at predetermined intervals in the length direction (left-right direction) of the steel beam 210. The diameter D1 of the first bolt hole 214 is set to a diameter that allows insertion of a high-strength bolt 250, which will be described later. In this embodiment, the diameter D1 of the first bolt hole 214 is set to 17 mm, but is not limited to this.

[0054] <Wood reinforcement material> The wooden reinforcement 220 is made of laminated wood. Note that the wooden material (wood) that makes up the wooden reinforcement 220 is not limited to laminated wood, and may be other types of wooden material, such as solid wood or LVL. The wooden reinforcement 220 is provided along the length of the steel beam 210, and is attached to the steel beam 210 with its bottom surface in contact with the bottom flange 212 of the steel beam 210 and one of its surfaces (both surfaces in the thickness direction (front-to-back direction) of the wooden reinforcement 220) in contact with the web 213 of the steel beam 210. In other words, the two wooden reinforcements 220 sandwich the web 213.

[0055] The height dimension (vertical dimension) of the wooden reinforcement 220 is set shorter than the height dimension of the web 213 of the steel beam 210 (the distance between the upper flange 211 and the lower flange 212 of the steel beam 210). The length (dimension in the left-right direction) of the wooden reinforcement material 220 is set to be shorter than the length of the steel beam 210. The thickness dimension (front-to-back dimension) of the wood reinforcement material 220 is set so that one of its surfaces contacts the web 213 of the steel beam 210 and the other of its surfaces is positioned outside the flanges 211, 212 of the steel beam 210 (opposite the web 113).

[0056] The wooden reinforcement material 220 has a plurality of through holes 221 formed therein, which penetrate the wooden reinforcement material 220 in the thickness direction (front-rear direction). The plurality of through holes 221 correspond to the first bolt holes 214 of the steel beams 210, and are provided at predetermined intervals in the length direction (left-right direction) of the wooden reinforcement material 220. The through hole 221 is composed of a truncated conical hole portion 222 and a cylindrical hole portion 223 that communicate with each other. In the first embodiment, the truncated conical hole portion 122 is provided closer to the web 113 than the cylindrical hole portion 123, whereas in the second embodiment, the cylindrical hole portion 223 is provided closer to the web 213 than the truncated conical hole portion 222.

[0057] The truncated cone-shaped hole 222 is formed on the side of the wood reinforcement material 220 opposite the web 213 so that its height direction (the height direction of the truncated cone, i.e., the direction perpendicular to the top and bottom surfaces of the truncated cone) is parallel to the thickness direction of the wood reinforcement material 220, and so that the top surface (the top surface of the truncated cone) is located closer to the web 213 than the bottom surface (the bottom surface of the truncated cone). In addition, the cylindrical hole portion 223 is formed in the part of the wood reinforcement material 220 on the web 213 side so that its height direction (the height direction of the cylinder, i.e., the direction perpendicular to the top and bottom surfaces of the cylinder) is parallel to the thickness direction of the wood reinforcement material 220 and so as to be continuous with the top surface of the truncated cone hole portion 222. Therefore, diameter D2 of through hole 221 on the web 213 side is different from diameter D3 of through hole 221 on the opposite side of web 213. Specifically, diameter D2 of through hole 221 on the web 213 side is smaller than diameter D3 of through hole 221 on the opposite side of web 213.

[0058] The diameter D2 of the through hole 221 on the web 213 side, i.e., the diameter of the top surface of the truncated cone-shaped hole portion 222, and the diameter of the cylindrical hole portion 223 (the diameter of the top and bottom surfaces of the cylindrical hole portion 223) are set larger than the diameter D1 of the first bolt hole 214 in the web 213 (D2>D1). Diameter D3 of through-hole 221 on the side opposite web 213, ie, the diameter of the bottom surface of truncated conical hole portion 222, is set larger than diameter D2 of through-hole 221 on the web 213 side (D3>D2). Furthermore, the distance L1 from the bottom to the top of the truncated cone-shaped hole 222 in the through-hole 221 is set to be longer than the distance L2 from the bottom to the top of the cylindrical hole 223 in the through-hole 221 (L1>L2).

[0059] 《Connection means》 The connecting means 230 is configured to include two truncated cone-shaped metal pieces 240, two cylindrical metal pieces 260, and a high-strength bolt 250. The connecting means 130 of the first embodiment includes the truncated cone-shaped metal pieces 140 as the metal pieces, whereas the connecting means 230 of the second embodiment includes the truncated cone-shaped metal pieces 240 and the cylindrical metal pieces 260 as the metal pieces.

[0060] The truncated cone-shaped metal member 240 is a metal member having a hollow truncated cone shape with an open bottom and a closed top. The cylindrical metal member 260 is, for example, a steel pipe. The truncated cone-shaped metal fitting 240 is disposed in the truncated cone-shaped hole portion 222 in the through hole 221 of the wood reinforcement material 220, and the cylindrical metal fitting 260 is inserted into the cylindrical hole portion 223 in the through hole 221. That is, in the connecting means 230 of the second embodiment, one end face (the end face on the web 213 side) of the cylindrical metal fitting 260 is the contact surface with the web 213 (first contact surface), and the surface (outer surface) of the side portion 241 of the truncated cone-shaped metal fitting 240 is the contact surface with the side wall of the through hole 221 (second contact surface).

[0061] The diameter D7 of the cylindrical metal object 260 is set to be larger than the diameter D1 of the first bolt hole 214 in the web 213 and smaller than (slightly smaller than) the diameter D2 on the web 213 side in the through-hole 221 of the wooden reinforcing material 220 (D1 < D7 < D2). In the present embodiment, the diameter (outer diameter) D7 of the cylindrical metal object 260 is set to 31.8 mm, but it is not limited thereto. The inner diameter (diameter of the hollow part) of the cylindrical metal object 260 is set to a diameter into which the high-strength bolt 250 can be inserted. In the present embodiment, the inner diameter of the cylindrical metal object 260 is set to 17.8 mm, but it is not limited thereto.

[0062] The diameter D4 of the top surface of the frustum-shaped metal object 240 is set to be larger than the diameter D2 on the web 213 side in the through-hole 221 of the wooden reinforcing material 220 (D4 > D2). In the present embodiment, the diameter D4 of the top surface of the frustum-shaped metal object 240 is set to 44 mm, but it is not limited thereto. Also, the diameter D5 of the bottom surface of the frustum-shaped metal object 240 is set to be smaller than the diameter D3 on the side opposite to the web 213 in the through-hole 221 of the wooden reinforcing material 220 (D5 < D3).

[0063] The distance L3 from the bottom surface to the top surface of the frustum-shaped metal object 240 is set to be shorter than the distance L1 from the bottom surface to the top surface of the frustum-shaped hole portion 222 in the through-hole 221 (L3 < L1). The length dimension L4 of the cylindrical metal object 260 is set to be longer than the distance L2 from the bottom surface to the top surface of the cylindrical hole portion 223 in the through-hole 221 (L4 > L2). Also, the sum of the distance L3 from the bottom surface to the top surface of the frustum-shaped metal object 240 and the length dimension L4 of the cylindrical metal object 260 is set to be shorter than the sum of the distance L1 from the bottom surface to the top surface of the frustum-shaped hole portion 222 in the through-hole 221 and the distance L2 from the bottom surface to the top surface of the cylindrical hole portion 223 in the through-hole 221 ((L3 + L4) < (L1 + L2)).

[0064] Also, before disposing the frustum-shaped metal object 240 in the through hole 221 of the wood reinforcing material 220, the inclination angle θ2 of the side surface portion 241 of the frustum-shaped metal object 240 is set to be larger (slightly larger than the inclination angle θ1) than the inclination angle θ1 of the side wall of the frustum-shaped hole portion 222 of the through hole 221 (θ2>θ1). In the present embodiment, the inclination angle θ2 of the side surface portion 241 of the frustum-shaped metal object 240 before disposing it in the through hole 221 of the wood reinforcing material 220 is set to 30°, but it is not limited thereto.

[0065] And in the frustum-shaped metal object 240, the side surface portion 241 is thinner than the top surface portion 242. In the present embodiment, the side surface portion 241 is formed of a steel plate having a thickness of 1.6 mm, but it is not limited thereto. Also, in the present embodiment, the top surface portion 242 is formed of a steel plate having a thickness of 3.2 mm, but it is not limited thereto. The frustum-shaped metal object 240 of the present embodiment is manufactured by welding and joining the side surface portion 241 and the top surface portion 242.

[0066] A second bolt hole 243 penetrating in the thickness direction (front-rear direction) of the top surface portion 242 is formed in the top surface portion 242 of the frustum-shaped metal object 240. The diameter D6 of the second bolt hole 243 is set to a diameter into which a high-strength bolt 250 can be inserted. In the present embodiment, the diameter D6 of the second bolt hole 243 is set to be larger than the diameter D1 of the first bolt hole 214 in the web 213 (D6>D1). Also, in the present embodiment, the diameter D6 of the second bolt hole 243 is set to be smaller than the diameter (outer diameter) D7 of the cylindrical metal object 260. Also, in the present embodiment, the diameter D6 of the second bolt hole 243 is set to be larger than the inner diameter (diameter of the hollow portion) of the cylindrical metal object 260.

[0067] The high-strength bolt (high-tensile bolt) 250 is used in a set with the nut 251 and two washers 252. In this embodiment, the diameter (nominal diameter) of the shaft portion of the high-strength bolt 250 is set to 16 mm, but is not limited to this. In addition, in this embodiment, the length of the shank of the high-strength bolt 250 is set to 120 mm, but this is not limited to this.

[0068] When the wooden reinforcement material 220 is placed in a predetermined position on the lower flange 212 of the steel beam 210, the center line of the first bolt hole 214 in the steel beam 210 and the center line of the through hole 221 in the wooden reinforcement material 220 coincide with each other. Furthermore, when the truncated cone-shaped metal member 240 and the cylindrical metal member 260 of the connecting means 230 are arranged within the through hole 221 in the wood reinforcement material 220, the center line of the through hole 221 in the wood reinforcement material 220, the center line of the second bolt hole 243 in the truncated cone-shaped metal member 240, and the center line of the hollow portion in the cylindrical metal member 260 are aligned.

[0069] Of the two wooden reinforcements 220, one wooden reinforcement 220 is placed at a predetermined position in front of the lower flange 212, and the other wooden reinforcement 220 is placed at a predetermined position in the rear of the lower flange 212. Also, of the two truncated cone-shaped metal pieces 240, one truncated cone-shaped metal piece 240 is disposed in the through-hole 221 of one wooden reinforcement 220, and the other truncated cone-shaped metal piece 240 is disposed in the through-hole 221 of the other wooden reinforcement 220. Furthermore, of the two cylindrical metal fittings 260, one cylindrical metal fitting 260 is arranged within the through hole 221 in one wooden reinforcement material 220, closer to the web 213 than one truncated cone-shaped metal fitting 240, and the other cylindrical metal fitting 260 is arranged within the through hole 221 in the other wooden reinforcement material 220, closer to the web 213 than the other truncated cone-shaped metal fitting 240. In that state, a high-strength bolt 250 is inserted from the through-hole 221 in one of the wooden reinforcing members 220 toward the through-hole 221 in the other wooden reinforcing member 220, and a nut 251 is screwed onto the shaft portion of the high-strength bolt 250 from the side of the through-hole 221 in the other wooden reinforcing member 220. Specifically, the high-strength bolt 250 is passed through one washer 252, the second bolt hole 243 in one frustum-shaped metal piece 240, the hollow portion in one cylindrical metal piece 260, the first bolt hole 214 in the web 213, the hollow portion in the other cylindrical metal piece 260, the second bolt hole 243 in the other frustum-shaped metal piece 240, and the other washer 252, and the nut 251 is screwed onto the shaft portion of the high-strength bolt 250. Thereby, the steel beam 210 and the two wooden reinforcing members 220 are integrally connected by the connecting means 230.

[0070] The diameter D7 of the cylindrical metal piece 260 is set smaller than the diameter D2 on the web 213 side in the through-hole 221 of the wooden reinforcing member 220 (D7 < D2). Therefore, in the state where the steel beam 210 and the two wooden reinforcing members 220 are connected by the connecting means 230, the web 213 of the steel beam 210 and one end face (the end face on the web 213 side) of the cylindrical metal piece 260 are in contact. In addition, in this state, the surface (outer surface) of the top surface portion 242 of the frustum-shaped metal piece 240 and the other end face (the end face opposite to the web 213) of the cylindrical metal piece 260 are in contact. Furthermore, in the present embodiment, the web 213 and the cylindrical metal piece 260 are joined by the high-strength bolt 250. Therefore, in the state where the steel beam 210 and the two wooden reinforcing members 220 are connected by the connecting means 230, the web 213 of the steel beam 210 and one end face (the end face on the web 213 side) of the cylindrical metal piece 260 are frictionally joined. In addition, in this state, the surface (outer surface) of the top surface portion 242 of the frustum-shaped metal piece 240 and the other end face (the end face opposite to the web 213) of the cylindrical metal piece 260 are frictionally joined.

[0071] Furthermore, the surface (outer surface) of the side portion 241 of the truncated cone-shaped metal fitting 240 is the contact surface (second contact surface) with the side wall of the through hole 221 of the wooden reinforcement 220, and is a truncated cone surface that widens from the web 213 side toward the opposite side of the web 213. Therefore, when the steel beam 210 and the two wooden reinforcements 220 are connected by the connecting means 230, the side portion 241 in contact with the wooden reinforcement 220 presses the wooden reinforcement 220 against the web 213. Furthermore, before the truncated cone-shaped metal fitting 240 is placed in the through hole 221, the inclination angle θ2 of the side surface portion 241 of the truncated cone-shaped metal fitting 240 is larger than the inclination angle θ1 of the side wall of the truncated cone-shaped hole portion 222 of the through hole 221 (θ2 > θ1). Furthermore, in the truncated cone-shaped metal fitting 240, the side surface portion 241 is thinner than the top surface portion 242. Therefore, as the nut 251 is tightened onto the high-strength bolt 250, the side surface portion 241 is deformed so that the inclination angle of the side surface portion 241 matches the inclination angle θ1 of the side wall of the truncated cone-shaped hole portion 222. In other words, when the steel beam 210 and the two wooden reinforcements 220 are connected by the connecting means 230, the side wall of the truncated cone-shaped hole portion 222 and the surface (outer surface) of the side surface portion 241 come into tight contact with each other. This allows the side portions 241 to effectively press the wood reinforcing material 220 against the web 213. In this way, in the composite beam 200 of this embodiment, the steel beam 210 and the two wooden reinforcing members 220 can be integrated together using only the connecting means 230, without using adhesives or the like.

[0072] In this embodiment, the diameter of the cylindrical hole portion 223 in the through-hole 221 of the wood reinforcing material 220 is the same as the diameter of the top surface of the truncated cone-shaped hole portion 222 . When the diameter of the cylindrical hole matches the diameter of the bottom of the truncated cone-shaped hole, a cylindrical recess is formed in the wood reinforcement material, and then the truncated cone-shaped hole is formed from the bottom of the recess. In this case, the depth of the recess is the distance L2 from the bottom to the top of the cylindrical hole. If there is an error in the depth of the recess, there will also be an error in the distance L1 from the bottom to the top of the truncated cone-shaped hole and the diameter of the top of the truncated cone-shaped hole (the diameter D2 on the web side of the through hole). In other words, if the timing of stopping the rotation of a drilling tool such as a hole saw is not accurately controlled when forming the cylindrical recess, there will be an error in the depth of the recess, which will in turn result in an error in the distance L1 from the bottom to the top of the truncated cone-shaped hole and the diameter D2 on the web side of the through hole. In contrast, in this embodiment, the diameter of the cylindrical hole 223 matches the diameter of the top surface of the truncated conical hole 222, so that the cylindrical hole 223 is formed by first drilling a cylindrical hole that penetrates the wood reinforcing material in the thickness direction and then forming the truncated conical hole 222. That is, when forming a cylindrical hole, it is sufficient to stop the rotation of the drilling tool when the drill penetrates the wood reinforcing material, so there is no need to precisely control the timing at which the rotation of the drilling tool is stopped when forming the cylindrical hole. Therefore, forming the through hole 221 is easier than when the diameter of the cylindrical hole matches the diameter of the bottom surface of the truncated conical hole.

[0073] "effect" According to the second embodiment, the following excellent effects are achieved. The composite beam 200 in the second embodiment is a composite beam made of steel and wood, and includes a steel beam 210 made of shaped steel having a web 213, a pair of wooden reinforcing members 220 arranged along the length direction (left-right direction) of the steel beam 210 and sandwiching the web 213, and a connecting means 230 that integrally connects the steel beam 210 and the pair of wooden reinforcing members 220, and the wooden reinforcing member 220 has a through hole 221 that penetrates the width direction (front-rear direction) of the steel beam 210. The connecting means 230 comprises metal fittings (a truncated conical metal fitting 240 and a cylindrical metal fitting 260) having a first contact surface which is the contact surface with the web 213 and a second contact surface which is the contact surface with the side wall of the through hole 221 of the wooden reinforcement material 220, and a high-strength bolt 250 which is provided across the through holes 221 of the pair of wooden reinforcement materials 220, and the metal fittings (cylindrical metal fittings 260) and the web 213 are joined by the high-strength bolt 250.

[0074] Therefore, the composite beam 200 is a steel beam 210 reinforced by a pair of wooden reinforcing members 220, and is therefore stronger than a steel beam, making it suitable for mid- to high-rise buildings. Furthermore, the connecting means 230 includes metal fittings (a truncated cone-shaped fitting 240 and a cylindrical fitting 260) that are joined to the web 213 while contacting the side walls of the through-hole 221 of the wooden reinforcing material 220. Therefore, the metal fittings can protect the through-hole 221 while preventing the wooden reinforcing material 220 from shifting position relative to the steel beam 210, so that the reinforcement state provided by the wooden reinforcing material 220 can be stably maintained.

[0075] In addition, in the composite beam 200 of the second embodiment, the second contact surface (surface (outer surface) of the side portion 241) can be a truncated cone surface that widens from the web 213 side toward the opposite side of the web 213.

[0076] With this configuration, the second contact surface (surface (outer surface) of the side portion 241) of the metal fitting (frustum-shaped metal fitting 240) is a truncated cone surface, so that tightening the high-strength bolt 250 pulls the wood reinforcement 220 to a certain position. In other words, tightening the high-strength bolt 250 makes it possible to press the wood reinforcement 220 against the web 213. Therefore, it is possible to integrate the steel beam 210 and the wood reinforcement 220 using only the connecting means 230, without using adhesives or the like.

[0077] In addition, in the composite beam 200 of the second embodiment, the through hole 221 includes a truncated conical hole portion 222, and the connecting means 230 is provided with a truncated conical metal member 240 having a top surface portion 242 in which a bolt hole (second bolt hole 243) through which a high-strength bolt 250 is inserted and a side surface portion 241 that is thinner than the top surface portion 242, and the surface of the side surface portion 241 is used as a second contact surface that is the contact surface with the side wall in the truncated conical hole portion 222, and before the high-strength bolt 250 is tightened, the inclination angle θ2 of the side surface portion 241 can be made larger than the inclination angle θ1 of the side wall in the truncated conical hole portion 222.

[0078] With this configuration, it is possible to deform the side surface 241 and make the inclination angle of the side surface 241 coincide with the inclination angle θ1 of the side wall by tightening the high-strength bolt 250. This makes it possible to reliably pull the wood reinforcement 220 to a fixed position by tightening the high-strength bolt 250, thereby enabling the function of the second contact surface (the function of pressing the wood reinforcement 220 against the web 213) to be effectively exerted.

[0079] In addition, in the composite beam 200 of the second embodiment, the through hole 221 includes a truncated conical hole portion 222 and a cylindrical hole portion 223 formed on the web 213 side of the truncated conical hole portion 222 and communicating with the truncated conical hole portion 222, and the connecting means 230 is provided with, as the metal parts, a truncated conical metal part 241 provided in the truncated conical hole portion 222 and a cylindrical metal part 260 inserted into the cylindrical hole portion 223, and it is possible to make the diameter of the cylindrical hole portion 223 the same as the diameter D2 of the truncated conical hole portion 222 on the web 213 side.

[0080] With this configuration, the through-holes 221 can be easily formed.

[0081] In addition, in the composite beam 200 of the second embodiment, the length dimension L4 of the cylindrical metal fitting 260 can be set longer than the length dimension L2 of the cylindrical hole portion 223, and can be set shorter than the dimension at which the second contact surface (the surface (outer surface) of the side portion 241) comes into contact with the side wall of the truncated conical hole portion 222 after the high-strength bolt 250 is tightened. This configuration allows the length dimension L4 of the cylindrical metal fitting 260 to be set to an appropriate dimension. Therefore, even if the cylindrical hole 223 that communicates with the truncated conical hole 222 is provided closer to the web 213 than the truncated conical hole 222, the wood reinforcement 220 can be reliably pulled to a certain position by tightening the high-strength bolt 250, making it possible to effectively perform the function of the second contact surface (the function of pressing the wood reinforcement 220 against the web 213).

[0082] Third Embodiment 《Composite beam》 Fig. 6 is a cross-sectional view showing an example of a composite beam 300 according to the third embodiment. Fig. 7 is an exploded cross-sectional view showing an example of a composite beam 300 according to the third embodiment. The composite beam 300 is a beam made of steel and wood. Specifically, as shown in Figures 6 and 7, the composite beam 300 is composed of a steel beam 310, two wooden reinforcing members 320 that reinforce the steel beam 310, and a connecting means 330 that connects the steel beam 310 and the two wooden reinforcing members 320.

[0083] Steel beam The steel beam 310 is made of an H-shaped steel. That is, the steel beam 310 has an upper flange 311, a lower flange 312, and a web 313. Note that the shaped steel (steel material) that makes up the steel beam 310 is not limited to an H-shaped steel, and may be any shaped steel having a web 313. A plurality of first bolt holes 314 are formed in the web 313, penetrating the thickness direction (front-rear direction) of the web 313. The plurality of first bolt holes 314 are provided at predetermined intervals in the length direction (left-right direction) of the steel beam 310. Diameter D1 of first bolt hole 314 is set to a diameter that allows insertion of high-strength bolt 350, which will be described later. In this embodiment, diameter D1 of first bolt hole 314 is set to 17 mm, but is not limited to this.

[0084] <Wood reinforcement material> The wooden reinforcement 320 is made of laminated wood. Note that the wooden material (wood) that makes up the wooden reinforcement 320 is not limited to laminated wood, and may be other types of wooden material, such as solid wood or LVL. The wooden reinforcement 320 is provided along the length of the steel beam 310 and is attached to the steel beam 310 with its bottom surface in contact with the bottom flange 312 of the steel beam 310 and one of its surfaces (both surfaces in the thickness direction (front-to-back direction) of the wooden reinforcement 320) in contact with the web 313 of the steel beam 310. In other words, the two wooden reinforcements 320 sandwich the web 313.

[0085] The height dimension (vertical dimension) of the wooden reinforcement 320 is set shorter than the height dimension of the web 313 of the steel beam 310 (the distance between the upper flange 311 and the lower flange 312 of the steel beam 310). The length (dimension in the left-right direction) of the wooden reinforcement material 320 is set to be shorter than the length of the steel beam 310. The thickness dimension (front-to-back dimension) of the wood reinforcement material 320 is set so that one of its surfaces contacts the web 313 of the steel beam 310 and the other surface is positioned outside the flanges 311, 312 of the steel beam 310 (opposite the web 113).

[0086] The wooden reinforcement material 320 has a plurality of through holes 321 formed therein, which penetrate the thickness direction (front-rear direction) of the wooden reinforcement material 320. The plurality of through holes 321 are provided at predetermined intervals in the length direction (left-right direction) of the wooden reinforcement material 320, corresponding to each of the first bolt holes 314 of the steel beam 310. The through hole 321 is made up of a truncated conical hole portion 322, a cylindrical hole portion (first cylindrical hole portion) 323, and a second cylindrical hole portion 324, which are connected to each other. In the first embodiment, the truncated conical hole portion 122 is provided closer to the web 113 than the cylindrical hole portion 123, whereas in the third embodiment, the cylindrical hole portion 323 is provided closer to the web 313 than the truncated conical hole portion 322. Furthermore, in the third embodiment, in addition to the truncated conical hole portion 322 and the cylindrical hole portion (first cylindrical hole portion) 323, a second cylindrical hole portion 324 is formed, and this second cylindrical hole portion 324 is provided on the opposite side of the web 313 than the truncated conical hole portion 322.

[0087] The truncated cone-shaped hole 322 is formed in the center of the front-to-rear direction of the wood reinforcement material 320 so that the height direction (the height direction of the truncated cone, i.e., the direction perpendicular to the top and bottom surfaces of the truncated cone) is parallel to the thickness direction of the wood reinforcement material 320, and so that the top surface (the top surface of the truncated cone) is located closer to the web 313 than the bottom surface (the bottom surface of the truncated cone). In addition, the cylindrical hole portion 323 is formed in the part of the wood reinforcement material 320 on the web 313 side so that its height direction (the height direction of the cylinder, i.e., the direction perpendicular to the top and bottom surfaces of the cylinder) is parallel to the thickness direction of the wood reinforcement material 320 and so as to be continuous with the top surface of the truncated cone hole portion 322. In addition, the second cylindrical hole portion 324 is formed on the part of the wood reinforcement material 320 opposite the web 313 so that its height direction (the height direction of the cylinder, i.e., the direction perpendicular to the top and bottom surfaces of the cylinder) is parallel to the thickness direction of the wood reinforcement material 320 and so as to be continuous with the bottom surface of the truncated cone hole portion 322. Therefore, diameter D2 of through hole 321 on the web 313 side is different from diameter D3 of through hole 321 on the opposite side of web 313. Specifically, diameter D2 of through hole 321 on the web 313 side is smaller than diameter D3 of through hole 321 on the opposite side of web 313.

[0088] The diameter D2 of the through hole 321 on the web 313 side, i.e., the diameter of the top surface of the truncated cone-shaped hole portion 322, and the diameter of the cylindrical hole portion 323 (the diameters of the top and bottom surfaces of the cylindrical hole portion 323) are set larger than the diameter D1 of the first bolt hole 314 in the web 313 (D2>D1). The diameter D3 of the through hole 321 on the side opposite the web 313, i.e., the diameter of the bottom surface of the truncated cone-shaped hole portion 322, and the diameter of the second cylindrical hole portion 324 (the diameter of the top and bottom surfaces of the second cylindrical hole portion 324) are set larger than the diameter D2 of the through hole 321 on the web 313 side (D3>D2). Furthermore, the distance L1 from the bottom surface to the top surface of the truncated cone-shaped hole portion 322 in the through-hole 321 is set to be shorter than the distance L2 from the bottom surface to the top surface of the cylindrical hole portion 323 in the through-hole 321 (L1 <L2)。

[0089] 《Connection means》 The connecting means 330 is configured to include two truncated cone-shaped metal pieces 340, two cylindrical metal pieces 360, and a high-strength bolt 350. The connecting means 130 of the first embodiment includes the truncated cone-shaped metal pieces 140 as the metal pieces, whereas the connecting means 330 of the third embodiment includes the truncated cone-shaped metal pieces 340 and the cylindrical metal pieces 360 as the metal pieces.

[0090] The truncated cone-shaped metal member 340 is manufactured by forming a hole (second bolt hole 343) that penetrates a solid metal member that has a truncated cone shape. The cylindrical metal object 360 is, for example, a steel pipe. The frustum-shaped metal object 340 is disposed within the frustum-shaped hole portion 322 in the through-hole 321 of the wooden reinforcing member 320, and the cylindrical metal object 360 is inserted into the cylindrical hole portion 323 in the through-hole 321. That is, in the connecting means 330 of the third embodiment, one end surface (the end surface on the side of the web 313) of the cylindrical metal object 360 is the contact surface (the first contact surface) with the web 313, and the side surface of the frustum-shaped metal object 340 is the contact surface (the second contact surface) with the side wall in the through-hole 321.

[0091] The diameter D7 of the cylindrical metal object 360 is set to be larger than the diameter D1 of the first bolt hole 314 in the web 313 and smaller than the diameter D2 on the side of the web 313 in the through-hole 321 of the wooden reinforcing member 320 (slightly smaller than the diameter D2) (D1 < D7 < D2). In the present embodiment, the diameter (outer diameter) D7 of the cylindrical metal object 360 is set to 31.8 mm, but it is not limited thereto. The inner diameter (the diameter of the hollow portion) of the cylindrical metal object 360 is set to a diameter into which the high-strength bolt 350 can be inserted. In the present embodiment, the inner diameter of the cylindrical metal object 360 is set to 17.8 mm, but it is not limited thereto.

[0092] The diameter D4 of the top surface of the frustum-shaped metal object 340 is set to be larger than the diameter D1 of the first bolt hole 314 in the web 313 and smaller than the diameter D2 on the side of the web 313 in the through-hole 321 of the wooden reinforcing member 320 (slightly smaller than the diameter D2) (D1 < D4 < D2). In the present embodiment, the diameter D4 of the top surface of the frustum-shaped metal object 340 is set to 31.8 mm, but it is not limited thereto. Also, the diameter D5 of the bottom surface of the frustum-shaped metal object 340 is set to be smaller than the diameter D3 on the side opposite to the web 313 in the through-hole 321 of the wooden reinforcing member 320 (D5 < D3).

[0093] The distance L3 from the bottom surface to the top surface of the frustum-shaped metal object 340 is set to be shorter (slightly shorter than the distance L1) than the distance L1 from the bottom surface to the top surface of the frustum-shaped hole portion 322 in the through-hole 321 (L3 < L1). The length dimension L4 of the cylindrical metal object 360 is set to be shorter (slightly shorter than the distance L2) than the distance L2 from the bottom surface to the top surface of the cylindrical hole portion 32X in the through-hole 321 (L4 < L2).

[0094] Also, in the state before disposing the frustum-shaped metal object 340 within the through-hole 321 of the wooden reinforcing member 320, the inclination angle θ2 of the side surface of the frustum-shaped metal object 340 is set to be larger (slightly larger than the inclination angle θ1) than the inclination angle θ1 of the side wall in the frustum-shaped hole portion 322 of the through-hole 321 (θ2 > θ1).

[0095] A second bolt hole 343 penetrating in the height direction (front-rear direction) of the frustum-shaped metal object 340 is formed in the frustum-shaped metal object 340. The diameter D6 of the second bolt hole 343 is set to a diameter into which a high-strength bolt 350 can be inserted. In the present embodiment, the diameter D6 of the second bolt hole 343 is set to be equal to the diameter D1 of the first bolt hole 314 in the web 313 (D6 = D1). Also, in the present embodiment, the diameter D6 of the second bolt hole 343 is set to be smaller than the diameter (outer diameter) D7 of the cylindrical metal object 360. Also, in the present embodiment, the diameter D6 of the second bolt hole 343 is set to be smaller than the inner diameter (diameter of the hollow portion) of the cylindrical metal object 360.

[0096] The high-strength bolt (high-tensile bolt) 350 is used in a set with a nut 351 and two washers 352. In the present embodiment, the diameter (nominal diameter) of the shaft portion of the high-strength bolt 350 is set to 16 mm, but it is not limited thereto. Also, in the present embodiment, the length of the shaft portion of the high-strength bolt 350 is set to 130 mm, but it is not limited thereto.

[0097] When the wooden reinforcement material 320 is placed in a predetermined position on the lower flange 312 of the steel beam 310, the center line of the first bolt hole 314 in the steel beam 310 and the center line of the through hole 321 in the wooden reinforcement material 320 coincide with each other. Furthermore, when the truncated cone-shaped metal member 340 and the cylindrical metal member 360 of the connecting means 330 are arranged within the through hole 321 in the wooden reinforcement material 320, the center line of the through hole 321 in the wooden reinforcement material 320, the center line of the second bolt hole 343 in the truncated cone-shaped metal member 340, and the center line of the hollow portion in the cylindrical metal member 360 are aligned.

[0098] Of the two wooden reinforcements 320, one wooden reinforcement 320 is placed in a predetermined position in front of the lower flange 312, and the other wooden reinforcement 320 is placed in a predetermined position in the rear of the lower flange 312. Also, of the two truncated cone-shaped metal pieces 340, one truncated cone-shaped metal piece 340 is disposed in the through-hole 321 of one wooden reinforcement 320, and the other truncated cone-shaped metal piece 340 is disposed in the through-hole 321 of the other wooden reinforcement 320. Furthermore, of the two cylindrical metal fittings 360, one cylindrical metal fitting 360 is arranged within the through hole 321 in one wooden reinforcement material 320, closer to the web 313 than one truncated cone-shaped metal fitting 340, and the other cylindrical metal fitting 360 is arranged within the through hole 321 in the other wooden reinforcement material 320, closer to the web 313 than the other truncated cone-shaped metal fitting 340. In that state, a high-strength bolt 350 is inserted from the through-hole 321 in one of the wood reinforcing members 320 toward the through-hole 321 in the other wood reinforcing member 320, and a nut 351 is screwed onto the shaft portion of the high-strength bolt 350 from the side of the through-hole 321 in the other wood reinforcing member 320. Specifically, the high-strength bolt 350 is passed through one washer 352, the second bolt hole 343 in one frustum-shaped metal object 340, the hollow portion in one cylindrical metal object 360, the first bolt hole 314 in the web 313, the hollow portion in the other cylindrical metal object 360, the second bolt hole 343 in the other frustum-shaped metal object 340, and the other washer 352, and the nut 351 is screwed onto the shaft portion of the high-strength bolt 350. Thereby, the steel beam 310 and the two wood reinforcing members 320 are integrally connected by the connecting means 330.

[0099] The diameter D7 of the cylindrical metal object 360 is set smaller than the diameter D2 on the web 313 side in the through-hole 321 of the wood reinforcing member 320 (D7 < D2). Therefore, in the state where the steel beam 310 and the two wood reinforcing members 320 are connected by the connecting means 330, the web 313 of the steel beam 310 and one end face (the end face on the web 313 side) of the cylindrical metal object 360 are in contact. In addition, in this state, the top surface of the frustum-shaped metal object 340 and the other end face (the end face opposite to the web 313) of the cylindrical metal object 360 are in contact. Furthermore, in the present embodiment, the web 313 and the cylindrical metal object 360 are joined by the high-strength bolt 350. Therefore, in the state where the steel beam 310 and the two wood reinforcing members 320 are connected by the connecting means 330, the web 313 of the steel beam 310 and one end face (the end face on the web 313 side) of the cylindrical metal object 360 are frictionally joined. In addition, in this state, the top surface of the frustum-shaped metal object 340 and the other end face (the end face opposite to the web 313) of the cylindrical metal object 360 are frictionally joined.

[0100] Furthermore, the side surface of the truncated cone-shaped metal fitting 340 is the contact surface (second contact surface) with the side wall of the through hole 321 of the wooden reinforcement 320, and is a truncated cone surface that widens from the web 313 side toward the opposite side of the web 313. Therefore, when the steel beam 310 and the two wooden reinforcements 320 are connected by the connecting means 330, the side surface of the truncated cone-shaped metal fitting 340 that is in contact with the wooden reinforcement 320 presses the wooden reinforcement 320 against the web 313. Furthermore, before the truncated cone-shaped metal piece 340 is placed in the through hole 321, the inclination angle θ2 of the side surface of the truncated cone-shaped metal piece 340 is larger than the inclination angle θ1 of the side wall of the truncated cone-shaped hole portion 322 of the through hole 321 (θ2>θ1). The truncated cone-shaped metal piece 340 is manufactured by forming a hole (second bolt hole 343) that penetrates a solid metal member (e.g., steel material) in the metal member. Therefore, as the nut 351 is tightened onto the high-strength bolt 350, the side wall of the truncated cone-shaped hole portion 322 is scraped away, and the truncated cone-shaped hole portion 322 is deformed so that the inclination angle of the side wall of the truncated cone-shaped metal piece 340 matches the inclination angle θ2 of the side surface of the truncated cone-shaped metal piece 340. That is, when the steel beam 310 and the two wooden reinforcements 320 are connected by the connecting means 330, the side wall of the truncated cone-shaped hole 322 tightly contacts the side surface of the truncated cone-shaped metal fitting 340. This allows the side surface of the truncated cone-shaped metal fitting 340 to effectively press the wooden reinforcement 320 against the web 313. In this way, in the composite beam 300 of this embodiment, the steel beam 310 and the two wooden reinforcing members 320 can be integrated together using only the connecting means 330, without using adhesives or the like.

[0101] Furthermore, the truncated cone-shaped metal member 340 of this embodiment is manufactured by forming a hole (second bolt hole 343) that penetrates a solid metal member. Therefore, the truncated cone-shaped metal member 340 is easier to manufacture than a truncated cone-shaped metal member that is manufactured by welding together a side surface and a top surface.

[0102] "effect" According to the third embodiment, the following excellent effects are achieved. The composite beam 300 in the third embodiment is a composite beam made of steel and wood, and includes a steel beam 310 made of shaped steel having a web 313, a pair of wooden reinforcing members 320 arranged along the length direction (left-right direction) of the steel beam 310 and sandwiching the web 313, and a connecting means 330 that integrally connects the steel beam 310 and the pair of wooden reinforcing members 320. The wooden reinforcing member 320 has a through hole 321 that penetrates the width direction (front-rear direction) of the steel beam 310. The connecting means 330 comprises metal fittings (a truncated conical metal fitting 340 and a cylindrical metal fitting 360) having a first contact surface which is the contact surface with the web 313 and a second contact surface which is the contact surface with the side wall of the through hole 321 of the wooden reinforcement material 320, and a high-strength bolt 350 which is provided across the through holes 321 of the pair of wooden reinforcement materials 320, and the metal fittings (cylindrical metal fittings 360) and the web 313 are joined by the high-strength bolt 350.

[0103] Therefore, the composite beam 300 is a steel beam 310 reinforced by a pair of wooden reinforcing members 320, and is therefore stronger than a steel beam, making it suitable for mid- to high-rise buildings. Furthermore, the connecting means 330 includes metal fittings (a truncated cone-shaped fitting 340 and a cylindrical fitting 360) that are joined to the web 313 while contacting the side walls of the through-hole 321 of the wooden reinforcing material 320. Therefore, the metal fittings can protect the through-hole 321 while preventing the wooden reinforcing material 320 from shifting position relative to the steel beam 310, so that the reinforcement provided by the wooden reinforcing material 320 can be stably maintained.

[0104] In addition, in the composite beam 300 of the third embodiment, the second contact surface (the side surface of the truncated cone-shaped metal fitting 340) can be a truncated cone surface that widens from the web 313 side toward the opposite side of the web 313.

[0105] With this configuration, the second contact surface (side surface) of the metal fitting (frustum-shaped metal fitting 340) is a truncated cone, so that tightening the high-strength bolt 350 pulls the wood reinforcement 320 to a fixed position. In other words, tightening the high-strength bolt 350 makes it possible to press the wood reinforcement 320 against the web 313. Therefore, it is possible to integrate the steel beam 310 and the wood reinforcement 320 using only the connecting means 330, without using adhesives or the like.

[0106] In addition, in the composite beam 300 of the third embodiment, the through hole 321 includes a truncated cone-shaped hole portion 222, and the connecting means 330 is provided with a truncated cone-shaped metal member 340 formed with a bolt hole (second bolt hole 343) in a solid metal body through which a high-strength bolt 350 is inserted, and the side surface of the truncated cone-shaped metal member 340 is used as a second contact surface that is the contact surface with the side wall of the truncated cone-shaped hole portion 322, and before the high-strength bolt 350 is tightened, the inclination angle θ2 of the side surface can be made greater than the inclination angle θ1 of the side wall.

[0107] With this configuration, by tightening the high-strength bolt 350, the side wall of the truncated conical hole 322 is deformed, and the inclination angle of the side wall can be made to match the inclination angle θ2 of the side surface of the truncated conical metal fitting 340. This brings the side wall of the truncated conical hole 322 and the second contact surface (the side surface of the truncated conical metal fitting 340) into tight contact, allowing the function of the second contact surface (the function of pressing the wood reinforcement 320 against the web 313) to be effectively exerted.

[0108] <Fourth embodiment> 《Composite beam》 FIG. 8 is a front view showing an example of a composite beam 400 according to the fourth embodiment. Fig. 9 is a diagram showing an example of a composite beam 400 in the fourth embodiment, and is a cross-sectional view taken along line AA in Fig. 8. Fig. 10 is a diagram showing an example of a composite beam 400 in the fourth embodiment, and is an exploded cross-sectional view taken along line AA in Fig. 8. Fig. 11 is a diagram showing an example of a composite beam 400 in the fourth embodiment, and is a cross-sectional view taken along line BB in Fig. 8. Fig. 12 is a diagram showing an example of a composite beam 400 in the fourth embodiment, and is an exploded cross-sectional view taken along line BB in Fig. 8. The composite beam 400 is a beam made of steel and wood. Specifically, as shown in Figures 8 to 12, the composite beam 400 is made up of a steel beam 410, two wooden reinforcing members 420 that reinforce the steel beam 410, and a connecting means 430 that connects the steel beam 410 and the two wooden reinforcing members 420.

[0109] Steel beam The steel beam 410 is made of an H-shaped steel. That is, the steel beam 410 has an upper flange 411, a lower flange 412, and a web 413. Note that the shaped steel (steel material) that makes up the steel beam 410 is not limited to an H-shaped steel, and may be any shaped steel having a web 413. The web 413 is formed with a plurality of first bolt holes 414 penetrating in the thickness direction (front-rear direction) of the web 413. The plurality of first bolt holes 414 are provided at predetermined intervals in the length direction (left-right direction) of the steel beam 410. The diameter D1 of the first bolt hole 414 is set to a diameter that allows insertion of a high-strength bolt 450, which will be described later. In this embodiment, the diameter D1 of the first bolt hole 414 is set to 17 mm, but is not limited to this.

[0110] Furthermore, the web 413 is formed with a plurality of third bolt holes 415 that penetrate the thickness direction (front-rear direction) of the web 413. The plurality of third bolt holes 415 are provided at predetermined intervals in the length direction (left-right direction) of the steel beam 410. In this embodiment, the first bolt holes 414 and the third bolt holes 415 are provided alternately along the length direction (left-right direction) of the steel beam 410. The diameter of third bolt hole 415 is set to a diameter that allows second bolt 470, which will be described later, to be inserted therein.

[0111] <Wood reinforcement material> The wooden reinforcement material 420 is made of laminated wood. Note that the wooden material (wood) that makes up the wooden reinforcement material 420 is not limited to laminated wood, and may be other types of wooden material such as solid wood or LVL. The wooden reinforcement 420 is provided along the length of the steel beam 410 and is attached to the steel beam 410 with its bottom surface in contact with the bottom flange 412 of the steel beam 410 and one of its surfaces (both surfaces in the thickness direction (front-to-back direction) of the wooden reinforcement 420) in contact with the web 413 of the steel beam 410. In other words, the two wooden reinforcements 420 sandwich the web 413.

[0112] The height dimension (vertical dimension) of the wooden reinforcement 420 is set shorter than the height dimension of the web 413 of the steel beam 410 (the distance between the upper flange 411 and the lower flange 412 of the steel beam 410). The length (horizontal dimension) of the wooden reinforcement material 420 is set to be shorter than the length of the steel beam 410. The thickness dimension (front-to-back dimension) of the wood reinforcement material 420 is set so that one of its surfaces contacts the web 413 of the steel beam 410 and the other surface is positioned outside the flanges 411, 412 of the steel beam 410 (opposite the web 113).

[0113] The wood reinforcement material 420 has a plurality of through holes 421 formed therein that penetrate the wood reinforcement material 420 in the thickness direction (front-rear direction). The plurality of through holes 421 are provided at predetermined intervals in the length direction (left-right direction) of the wood reinforcement material 420, corresponding to each of the first bolt holes 414 of the steel beam 410. The through hole 421 is a cylindrical hole and is formed so that its height direction (the height direction of the cylinder, i.e., the direction perpendicular to the top and bottom surfaces of the cylinder) is parallel to the thickness direction of the wood reinforcement material 420. Therefore, in this embodiment, the diameter D2 of the through-hole 421 on the side of the web 413 and the diameter D3 of the through-hole 421 on the side opposite to the web 413 are the same (D2=D3). The diameter D2 of through-hole 421 on the web 413 side is set to be larger than the diameter D1 of first bolt hole 414 in web 413 (D2>D1).

[0114] Furthermore, the wood reinforcement 420 is formed with a plurality of fourth bolt holes 425 that penetrate in the thickness direction (front-rear direction) of the wood reinforcement 420. The plurality of fourth bolt holes 425 correspond to the third bolt holes 415 of the steel beams 410, and are provided at predetermined intervals in the length direction (left-right direction) of the wood reinforcement 420. The diameter of fourth bolt hole 425 is set to a diameter that allows second bolt 470, which will be described later, to be inserted therein. Of both ends (front end and rear end) of fourth bolt hole 425, the end opposite web 413 forms seat recess 426.

[0115] 《Connection means》 The connecting means 430 is configured to include two cylindrical metal members 440 , a high-strength bolt 450 , and a second bolt 470 . The cylindrical metal member 440 is a metal member having a hollow cylindrical shape with an open bottom and a closed top. That is, the cylindrical metal member 440 has a side portion 441 and a top portion 442. In the connecting means 430 of the fourth embodiment, the surface (outer surface) of the top portion 442 is the contact surface (first contact surface) with the web 413, and the surface (outer surface) of the side portion 441 is the contact surface (second contact surface) with the side wall of the through hole 421 of the wood reinforcement material 420.

[0116] The diameter D4 of the top surface of the cylindrical metal member 440 and the diameter D5 of the bottom surface of the cylindrical metal member 440 are set to be larger than the diameter D1 of the first bolt hole 414 in the web 413 and smaller than the diameter D2 of the through hole 421 of the wood reinforcement material 420 on the web 413 side (slightly smaller than the diameter D2) (D1 <D4=D5<D2)。 In this embodiment, the diameter D2 of the through-hole 421 on the web 413 side is set to 61 mm, but is not limited to this. In addition, in this embodiment, the diameter D4 of the top surface of the columnar metal member 440 is set to 60.5 mm, but this is not limited to this.

[0117] The distance L3 from the bottom surface to the top surface of the columnar metal member 440 is set shorter than the length dimension of the through-hole 421, that is, the thickness dimension (front-rear dimension) of the wood reinforcement member 420. In this embodiment, the distance L3 from the bottom surface to the top surface of the columnar metal member 440 is set to 80 mm, but is not limited to this. In this embodiment, the thickness dimension (dimension in the front-to-rear direction) of the wood reinforcement material 420 is set to 86 mm, but this is not limited to this.

[0118] In the columnar metal member 440, the side surface portion 441 is thinner than the top surface portion 442. In this embodiment, the side surface portion 441 is formed of a steel pipe having an outer diameter of 60.5 mm, an inner diameter of 54.1 mm, and a length of 70 mm, but is not limited to this. In addition, in this embodiment, the top surface portion 442 is formed from a steel plate with a thickness of 10 mm, but this is not limitative. The cylindrical metal member 440 of this embodiment is manufactured by welding a side surface portion 441 and a top surface portion 442 together.

[0119] A second bolt hole 443 is formed in the top surface portion 442 of the columnar metal member 440, penetrating the top surface portion 442 in the thickness direction (front-rear direction). The diameter D6 of the second bolt hole 443 is set to a diameter that allows the insertion of the high-strength bolt 450. In this embodiment, the diameter D6 of the second bolt hole 443 is set to be equal to the diameter D1 of the first bolt hole 414 in the web 413 (D6=D1).

[0120] A high-strength bolt (high-tensile bolt) 450 is used as a set with a nut 451 and two washers 452 . In this embodiment, the diameter (nominal diameter) of the shaft portion of the high-strength bolt 450 is set to 16 mm, but is not limited to this. In addition, in this embodiment, the length of the shank of the high-strength bolt 450 is set to 60 mm, but this is not limited to this.

[0121] The second bolt 470 is, for example, a normal bolt (medium bolt) and is used as a set with a second nut 471 and two second washers 472 . In this embodiment, the diameter (nominal diameter) of the shaft portion of second bolt 470 is set to 12 mm, but is not limited to this. In addition, in this embodiment, the length of the shaft portion of the second bolt 470 is set to 140 mm, but this is not limited to this.

[0122] When the wooden reinforcement material 420 is placed in a predetermined position on the lower flange 412 of the steel beam 410, the center line of the first bolt hole 414 in the steel beam 410 coincides with the center line of the through hole 421 in the wooden reinforcement material 420, and the center line of the third bolt hole 415 in the steel beam 410 coincides with the center line of the fourth bolt hole 425 in the wooden reinforcement material 420. Furthermore, when the cylindrical metal fitting 440 of the connecting means 430 is arranged within the through hole 421 in the wooden reinforcing material 420, the center line of the through hole 421 in the wooden reinforcing material 420 and the center line of the second bolt hole 443 in the cylindrical metal fitting 440 coincide with each other.

[0123] Of the two wooden reinforcement materials 420, one wooden reinforcement material 420 is placed at a predetermined position in front of the lower flange 412, and the other wooden reinforcement material 420 is placed at a predetermined position in the rear of the lower flange 412. Also, of the two cylindrical metal fittings 440, one cylindrical metal fitting 440 is disposed in the through hole 421 of one wooden reinforcement material 420, and the other cylindrical metal fitting 440 is disposed in the through hole 421 of the other wooden reinforcement material 420. In that state, a high-strength bolt 450 is inserted from the through-hole 421 in one of the wooden reinforcing members 420 toward the through-hole 421 in the other wooden reinforcing member 420, and a nut 451 is screwed onto the shaft portion of the high-strength bolt 450 from the side of the through-hole 421 in the other wooden reinforcing member 420. Specifically, the high-strength bolt 450 is passed through one washer 452, the second bolt hole 443 in one cylindrical metal object 440, the first bolt hole 414 in the web 413, the second bolt hole 443 in the other cylindrical metal object 440, the other washer 452, and the nut 451 is screwed onto the shaft portion of the high-strength bolt 450.

[0124] Also, in that state, a second bolt 470 is inserted from the recessed portion 426 in one of the wooden reinforcing members 420 toward the recessed portion 426 in the other wooden reinforcing member 420, and a second nut 471 is screwed onto the shaft portion of the second bolt 470 from the side of the recessed portion 426 in the other wooden reinforcing member 420. Specifically, the second bolt 470 is passed through one second washer 472, the fourth bolt hole 425 in one wooden reinforcing member 420, the third bolt hole 415 in the web 413, the fourth bolt hole 425 in the other wooden reinforcing member 420, the other second washer 472, and the second nut 471 is screwed onto the shaft portion of the second bolt 470. Thereby, the steel beam 410 and the two wooden reinforcing members 420 are integrally connected by the connecting means 430.

[0125] The diameter D4 of the top surface of the cylindrical metal object 440 is set smaller than the diameter D2 on the web 413 side in the through-hole 421 of the wooden reinforcing member 420 (D4 < D2). Therefore, in the state where the steel beam 410 and the two wooden reinforcing members 420 are connected by the connecting means 430, the web 413 of the steel beam 410 and the surface (outer surface) of the top surface portion 442 of the cylindrical metal object 440 are in contact. Furthermore, in this embodiment, the web 413 and the cylindrical metal member 440 are joined by high-strength bolts 450. Therefore, when the steel beam 410 and the two wooden reinforcements 420 are connected by the connecting means 430, the web 413 of the steel beam 410 and the surface (outer surface) of the top surface 442 of the cylindrical metal member 440 are frictionally joined.

[0126] Furthermore, the connecting means 430 of this embodiment includes a second bolt 470 in addition to the high-strength bolt (first bolt) 450, and the second bolt 470 joins the web 413 and the wooden reinforcement member 420. Therefore, when the steel beam 410 and the two wooden reinforcement members 420 are connected by the connecting means 430, one wooden reinforcement member 420 is pressed against the web 413 by one second washer 472 (and the head of the second bolt 470), and the other wooden reinforcement member 420 is pressed against the web 413 by the other second washer 472 (and the second nut 471). In this way, in the composite beam 400 of this embodiment, the steel beam 410 and the two wooden reinforcing members 420 can be integrated together using only the connecting means 430, without using adhesives or the like.

[0127] "effect" According to the fourth embodiment, the following excellent effects are achieved. The composite beam 400 in the fourth embodiment is a composite beam made of steel and wood, and includes a steel beam 410 made of shaped steel having a web 413, a pair of wooden reinforcing members 420 arranged along the length direction (left-right direction) of the steel beam 410 and sandwiching the web 413, and a connecting means 430 that integrally connects the steel beam 410 and the pair of wooden reinforcing members 420. The wooden reinforcing members 420 have a connecting means 430 that penetrates the steel beam 410 in the width direction (front-back direction). A through hole 421 is formed, and the connecting means 430 comprises a metal piece (cylindrical metal piece 440) having a first contact surface which is the contact surface with the web 413 and a second contact surface which is the contact surface with the side wall of the through hole 421 of the wooden reinforcement material 420, and a high-strength bolt 450 which is installed across the through holes 421 in the pair of wooden reinforcement materials 420, and the metal piece (cylindrical metal piece 440) and the web 413 are joined by the high-strength bolt 450.

[0128] Therefore, the composite beam 400 is a steel beam 410 reinforced by a pair of wooden reinforcing members 420, and is therefore stronger than a steel beam and suitable for mid- to high-rise buildings. Furthermore, the connecting means 430 includes a metal piece (cylindrical metal piece 440) that is joined to the web 413 while contacting the side wall of the through-hole 421 of the wooden reinforcement material 420. Therefore, the metal piece protects the through-hole 421 while preventing misalignment of the wooden reinforcement material 420 relative to the steel beam 410 (misalignment in a direction perpendicular to the width direction (front-rear direction) of the steel beam 410), thereby stably maintaining the reinforcement provided by the wooden reinforcement material 420.

[0129] In addition, in the composite beam 400 of the fourth embodiment, the second contact surface (surface (outer surface) of the side portion 441) is a cylindrical surface with the same diameter on the web 413 side (diameter D4 of the top surface) and the same diameter on the opposite side from the web 413 (diameter D5 of the bottom surface), and the connecting means 430 comprises a metal piece (cylindrical metal piece 440), a high-strength bolt 450, and a second bolt 470, and the wood reinforcement material 420 and the web 413 can be joined by the second bolt 470.

[0130] With this configuration, the second bolt 470 can press the wooden reinforcement 420 against the web 413. Therefore, the steel beam 410 and the wooden reinforcement 420 can be integrated using only the connecting means 430, without using adhesives or the like.

[0131] In recent years, there has also been a call to achieve the goals of the SDGs (Sustainable Development Goals), and various initiatives are being undertaken in the construction industry. The composite beams 100, 200, 300, and 400 in the above embodiments can be used as beams with higher strength than steel beams. Therefore, buildings using the composite beams 100, 200, 300, and 400 in the above embodiments have a long lifespan. Therefore, the composite beams 100, 200, 300, and 400 in the above embodiments can contribute to achieving SDGs Goal 7 "Affordable and clean energy," Goal 11 "Sustainable cities and communities," Goal 13 "Take urgent action to combat climate change," etc. [Explanation of symbols]

[0132] 100,200,300,400 Composite beam 110,210,310,410 Steel beams 113,213,313,413 Web 120,220,320,420 Wood reinforcement material 121,221,321,421 Through holes 122,222,322 truncated cone hole 123,223,323 Cylindrical hole 130,230,330,430 Connection means 140, 240, 340 Conical metal fittings (metal fittings) 141,241,441 Side part 142,242,442 Top section 143, 243, 343, 443 Second bolt hole (bolt hole) 150,250,350,450 high strength bolts 260,360 Cylindrical metal fittings (metal fittings) 440 Cylindrical metal fittings (metal fittings) 470 Second Bolt

Claims

1. A composite beam made of steel and wood, a steel beam made of shaped steel having a web; A pair of wooden reinforcing members are provided along the longitudinal direction of the steel beam and sandwich the web therebetween; and a connecting means for integrally connecting the steel beam and the pair of wood reinforcing members, The wood reinforcement material has a through hole formed therein that penetrates the steel beam in the width direction, The connecting means is a metal fitting having a first contact surface that is a contact surface with the web and a second contact surface that is a contact surface with a side wall of the through hole of the wood reinforcement material; a high-strength bolt provided across the through holes in the pair of wood reinforcing materials, A composite beam characterized in that the metal fittings and the web are joined by the high-strength bolts.

2. 2. The composite beam of claim 1, A composite beam, wherein the second contact surface is a truncated cone surface that widens from the web side toward the opposite side from the web.

3. 3. The composite beam of claim 2, the through hole includes a truncated cone-shaped hole portion, The connecting means includes, as the metal member, a truncated cone-shaped metal member having a top surface portion in which a bolt hole into which the high-strength bolt is inserted is formed, and a side surface portion that is thinner than the top surface portion, a surface of the side surface portion is the second contact surface which is a contact surface with a side wall of the truncated conical hole portion, A composite beam characterized in that, before the high-strength bolts are tightened, the side surface portion has a larger inclination angle than the side wall of the truncated cone-shaped hole portion.

4. 3. The composite beam of claim 2, the through hole includes a truncated cone-shaped hole portion, The connecting means includes, as the metal part, a truncated cone-shaped metal part having a side surface part and a top surface part formed with a bolt hole into which the high-strength bolt is inserted, a surface of the side surface portion is the second contact surface which is a contact surface with a side wall of the truncated conical hole portion, A composite beam characterized in that, before the high-strength bolts are tightened, the diameter of the top surface portion is larger than the diameter of the web side of the truncated cone-shaped hole portion.

5. 5. The composite beam according to claim 3 or 4, the through hole includes the truncated conical hole portion and a cylindrical hole portion that is formed closer to the web than the truncated conical hole portion and that communicates with the truncated conical hole portion, The connecting means includes, as the metal parts, the truncated conical metal part provided in the truncated conical hole part and a cylindrical metal part inserted into the cylindrical hole part, A composite beam, characterized in that the diameter of the cylindrical hole portion is the same as the diameter of the truncated cone hole portion on the web side.

6. 6. The composite beam of claim 5, The length of the cylindrical metal piece is: The length dimension of the cylindrical hole is set to be longer than the length dimension of the cylindrical hole, A composite beam characterized in that, after the high-strength bolt is tightened, the second contact surface is set to be shorter than the dimension at which it contacts the side wall of the truncated conical hole portion.

7. 3. The composite beam of claim 2, the through hole includes a truncated cone-shaped hole portion, The connecting means includes, as the metal part, a truncated cone metal part having a solid metal body and a bolt hole into which the high-strength bolt is inserted, The side surface of the truncated cone-shaped metal member is the second contact surface, which is a contact surface with the side wall of the truncated cone-shaped hole portion, A composite beam characterized in that, before the high-strength bolts are tightened, the side surface of the truncated cone-shaped metal fitting has a larger inclination angle than the side wall of the truncated cone-shaped hole portion.

8. 2. The composite beam of claim 1, the second contact surface is a cylindrical surface having the same diameter on the web side and the same diameter on the opposite side to the web, the connecting means includes the metal fitting, the high-strength bolt, and a second bolt, A composite beam, characterized in that the wood reinforcement material and the web are joined by the second bolt.

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