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 a composite beam.

Background Art

[0002] Patent Document 1 discloses a building having a steel frame structure. In this building, a steel beam made of H-shaped steel is used as a beam.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the case of a building with a large number of floors, such as a mid-rise or high-rise building, it is particularly desirable to use a beam with higher strength than a steel beam. The present invention has been made in view of the above circumstances, and the problem thereof is to provide a beam suitable for mid-rise and high-rise buildings.

Means for Solving the Problems

[0009] The invention according to claim 1 for example Figure 4, as shown in FIG. 5 A composite beam 200 made of steel and wood, A steel beam 210 made of structural steel having a web 213, A pair of wooden reinforcing members 220 are provided along the length of the steel beam 210 and sandwich the web 213, The system includes a connecting means 230 that integrally connects the steel beam 210 and the pair of wooden reinforcing members 220. The aforementioned wooden reinforcing material 220 has through holes 221 that penetrate the steel beam 210 in the width direction. The aforementioned connecting means 230 is A metal fitting (frustoconical fitting 240, cylindrical 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 wood reinforcing material 220, The system includes a high-strength bolt 250 provided across the through holes 221 in the pair of wood reinforcing members 220, The metal fitting (cylindrical metal fitting 260) and the web 213 are joined by the high-strength bolt 250. The second contact surface is a frustoconical surface that extends from the web 213 side toward the opposite side of the web 213. The through hole Hole 2 21 is a frustum-shaped hole Part 2 including 22, the connecting piece Step 2 30, as the hardware, has a top surface where the high-strength bolt T2 50 is inserted (second bolt Hole 2 43) formed, Part 2 42, and the top surface Part 2 41, a side surface thinner than the top surface Part 2 40, a frustum-shaped metal object having Item 2 and is provided with the side surface Part 2 41's surface is the second contact surface that is the contact surface with the side wall in the frustum-shaped hole Part 2 22, the high-strength bolt T2 50, in the state before tightening, the side surface Part 2 41 is Part 2 greater in inclination angle than the side wall in the frustum-shaped hole Ku, The through hole 221 includes the frustoconical hole portion 222 and a cylindrical hole portion 223 formed on the web 213 side of the frustoconical hole portion 222 and communicating with the frustoconical hole portion 222. The connecting means 230 comprises, as the metal fittings, a frustoconical metal fitting 240 provided in the frustoconical hole 222, and a cylindrical metal fitting 260 inserted into the cylindrical hole 223. The diameter of the cylindrical hole portion 223 is the same as the diameter D2 on the web 213 side of the frustoconical hole portion 222. The length dimension L4 of the cylindrical metal fitting 260 is The length of the cylindrical hole 223 is set to be longer than the length dimension L2, In the state after tightening the high-strength bolt 250, the second contact surface (the surface (outer surface) of the side portion 241) is set to be shorter than the dimension to which it contacts the side wall of the frustoconical hole portion 222. which is characterized by.

[0010] Claim 1 According to the invention described in, The composite beam 200 is a steel beam 210 reinforced with a pair of wooden reinforcing members 220, and therefore has higher strength than a steel beam, making it suitable for medium- and high-rise buildings. Furthermore, since the second contact surface of the metal fitting (frustoconical metal fitting 240) is a frustoconical surface, tightening the high-strength bolt 250 will pull the wood reinforcing material 220 to a certain position. In other words, by tightening the high-strength bolt 250, it is possible to press the wood reinforcing material 220 against the web 213. Therefore, it is possible to integrate the steel beam 210 and the wood reinforcing material 220 using only the connecting means 230, without using adhesives or the like. Also, the high-strength bolt T2 50, by tightening, the side surface Part 2 41 can be deformed to make the inclination angle of the side surface Part 2 41 coincide with the inclination angle of the side wall. Therefore, by tightening the high-strength bolt T2 50, the wooden reinforcement Material 2 20 can be surely pulled to a certain position, so that the function of the second contact surface (the function of pressing the wooden reinforcement Material 2 20 against the Bu2 13) can be effectively exerted. Furthermore, the formation of the through-hole 221 is easy. Furthermore, the length dimension L4 of the cylindrical metal fitting 260 is set to an appropriate dimension. Therefore, even if a cylindrical hole 223 communicating with the frustoconical hole 222 is provided on the web 213 side of the frustoconical hole 222, the wood reinforcing material 220 can be reliably pulled to a certain position by tightening the high-strength bolt 250, thereby enabling the function of the second contact surface (the function of pressing the wood reinforcing material 220 against the web 213) to be effectively performed.

[0011] Claim 2 The invention described above is, for example, Figure 4, As shown in Figure 5, A composite beam 200 made of steel and wood, A steel beam 210 made of structural steel having a web 213, A pair of wooden reinforcing members 220 are provided along the length of the steel beam 210 and sandwich the web 213, The system includes a connecting means 230 that integrally connects the steel beam 210 and the pair of wooden reinforcing members 220. The aforementioned wooden reinforcing material 220 has through holes 221 that penetrate the steel beam 210 in the width direction. The aforementioned connecting means 230 is A metal fitting (frustoconical fitting 240, cylindrical 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 wood reinforcing material 220, The system includes a high-strength bolt 250 provided across the through holes 221 in the pair of wood reinforcing members 220, The metal fitting (cylindrical metal fitting 260) and the web 213 are joined by the high-strength bolt 250. The second contact surface is a frustoconical surface that extends from the web 213 side toward the opposite side of the web 213. The aforementioned penetration Hole 2 21 is a frustoconical hole. Part 2 Including 22, Previous joint Step 2 30 is the aforementioned metal fitting, side Part 2 41 and the aforementioned high-strength bolt T2 50 is inserted into the bolt hole (second bolt) Hole 2 43) Top surface Part 2 42 and a frustoconical metal Item 2 It has 40, The side Part 2 The surface of 41 is the frustoconical hole Part 2 The second contact surface is the contact surface with the side wall at 22, The aforementioned high-strength bolt T2 In the state before tightening 50, the top surface Part 2 The diameter D4 of 42 is the frustoconical hole. Part 2 The above in 22 Bu2 The diameter D2 on side 13 is larger Ku, The through hole 221 includes the frustoconical hole portion 222 and a cylindrical hole portion 223 formed on the web 213 side of the frustoconical hole portion 222 and communicating with the frustoconical hole portion 222. The connecting means 230 comprises, as the metal fittings, a frustoconical metal fitting 240 provided in the frustoconical hole 222, and a cylindrical metal fitting 260 inserted into the cylindrical hole 223. The diameter of the cylindrical hole portion 223 is the same as the diameter D2 on the web 213 side of the frustoconical hole portion 222. The length dimension L4 of the cylindrical metal fitting 260 is The length of the cylindrical hole 223 is set to be longer than the length dimension L2, In the state after tightening the high-strength bolt 250, the second contact surface (the surface (outer surface) of the side portion 241) is set to be shorter than the dimension to which it contacts the side wall of the frustoconical hole portion 222. It is characterized by the following:

[0012] Claim 2 According to the invention described, The composite beam 200 is a steel beam 210 reinforced with a pair of wooden reinforcing members 220, and therefore has higher strength than a steel beam, making it suitable for medium- and high-rise buildings. Furthermore, since the second contact surface of the metal fitting (frustoconical metal fitting 240) is a frustoconical surface, tightening the high-strength bolt 250 will pull the wood reinforcing material 220 to a certain position. In other words, by tightening the high-strength bolt 250, it is possible to press the wood reinforcing material 220 against the web 213. Therefore, it is possible to integrate the steel beam 210 and the wood reinforcing material 220 using only the connecting means 230, without using adhesives or the like. Also, High-strength bolt T2 By tightening 50, a frustoconical hole is created. Part 2 The side wall at 22 is deformed, and the inclination angle of the side wall is changed to the side Part 2 It becomes possible to match the inclination angle of 41. Therefore, high-strength bolt T2 By tightening 50, the wood is reinforced. Material 2 Since 20 can be reliably pulled to a fixed position, the function of the second contact surface (wood reinforcement) Material 2 20 up Bu2 This makes it possible to effectively utilize the function of pressing against 13. Furthermore, the formation of the through-hole 221 is easy. Furthermore, the length dimension L4 of the cylindrical metal fitting 260 is set to an appropriate dimension. Therefore, even if a cylindrical hole 223 communicating with the frustoconical hole 222 is provided on the web 213 side of the frustoconical hole 222, the wood reinforcing material 220 can be reliably pulled to a certain position by tightening the high-strength bolt 250, thereby enabling the function of the second contact surface (the function of pressing the wood reinforcing material 220 against the web 213) to be effectively performed. [Effects of the Invention]

[0021] According to the present invention, it is possible to provide beams suitable for medium- and high-rise buildings. [Brief explanation of the drawing]

[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: This is 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: This is 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: This is 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 Figure 8. [Figure 10] Fourth embodiment: A diagram showing an example of a composite beam, which is an exploded cross-sectional view along line AA in Figure 8. [Figure 11] Fourth embodiment: A diagram showing an example of a composite beam, which is a cross-sectional view along line BB in Figure 8. [Figure 12] Fourth embodiment: A diagram showing an example of a composite beam, which is an exploded cross-sectional view along line BB in Figure 8. [Modes for carrying out the invention]

[0023] Embodiments of the present invention will be described below with reference to the drawings. However, the embodiments described below are subject to various technically preferred limitations 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 the directions (front-back direction, left-right direction, up-down direction) in the following embodiments and illustrated examples are set solely for the convenience of explanation.

[0024] Furthermore, in the following explanation, when ordinal numbers such as "first" and "second" are attached to a common name, the ordinal number is used solely for the purpose of identifying the object to which it is attached. The ordinal number does not limit the object to which it is attached to a specific object, nor does it specify the order, rank, sequence, class, priority, or subordination of the object to which it is attached.

[0025] <First Embodiment> 《Composite beam》 Figure 1 is a perspective view showing an example of composite beam 100. Figure 2 is a cross-sectional view showing an example of composite beam 100. Figure 3 is an exploded cross-sectional view showing an example of 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 made up of a steel beam 110, two wooden reinforcing members 120 that reinforce the steel beam 110, and connecting means 130 that connect the steel beam 110 and the two wooden reinforcing members 120.

[0026] Steel beam The steel beam 110 is constructed from H-shaped steel. Specifically, the steel beam 110 has an upper flange 111, a lower flange 112, and a web 113. Note that the structural steel (steel material) that makes up the steel beam 110 is not limited to H-shaped steel; any structural steel having a web 113 is acceptable. The web 113 has a plurality of first bolt holes 114 that penetrate through the web 113 in the thickness direction (front-to-back direction). These plurality of first bolt holes 114 are provided at predetermined intervals in the length direction (left-to-right direction) of the steel beam 110. The diameter D1 of the first bolt hole 114 is set to a diameter that allows the insertion of the 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 it is not limited to this.

[0027] Wood-based reinforcing material The wood reinforcement material 120 is made of laminated timber. However, the wood material (wood) that makes up the wood reinforcement material 120 is not limited to laminated timber, but may also be other types of wood materials such as solid wood or LVL (Laminated Veneer Lumber). The wooden reinforcing members 120 are installed along the length of the steel beam 110, with their lower surfaces in contact with the lower flange 112 of the steel beam 110, and one of their surfaces (both sides in the thickness direction (front-to-back direction) of the wooden reinforcing members 120) in contact with the web 113 of the steel beam 110, thus being attached to the steel beam 110. In other words, the web 113 is sandwiched between the two wooden reinforcing members 120.

[0028] The height dimension (vertical dimension) of the wooden reinforcement member 120 is set to be shorter than the height dimension of the web 113 on the steel beam 110 (the distance between the upper flange 111 and the lower flange 112 on the steel beam 110). The length dimension (horizontal dimension) of the wood reinforcement member 120 is set to be shorter than the length dimension of the steel beam 110. The thickness dimension (dimension in the front-to-back direction) of the wood reinforcement material 120 is set such that one of its surfaces is in contact with the web 113 of the steel beam 110, and the other of its surfaces is located outside the flanges 111 and 112 of the steel beam 110 (on the opposite side from the web 113).

[0029] The wooden reinforcing member 120 has a plurality of through holes 121 that penetrate through the wooden reinforcing member 120 in the thickness direction (front-to-back direction). These plurality of through holes 121 are provided at predetermined intervals in the length direction (left-to-right direction) of the wooden reinforcing member 120, corresponding to each first bolt hole 114 of the steel beam 110. The through hole 121 consists of a frustoconical hole portion 122 and a cylindrical hole portion 123 that are in communication with each other.

[0030] The frustoconical hole 122 is formed in the portion of the wood reinforcement material 120 on the web 113 side, such that the height direction (the height direction of the frustocone, i.e., the direction perpendicular to the top and bottom surfaces of the frustocone) is parallel to the thickness direction of the wood reinforcement material 120, and the top surface (top surface of the frustocone) is located on the web 113 side than the bottom surface (bottom surface of the frustocone). Furthermore, the cylindrical hole 123 is formed on the side of the wood reinforcing material 120 opposite to the web 113, such 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 reinforcing material 120, and that it is continuous with the bottom surface of the frustoconical hole 122. Therefore, the diameter D2 on the web 113 side of the through hole 121 is different from the diameter D3 on the opposite side of the web 113 in the through hole 121. Specifically, the diameter D2 on the web 113 side of the through hole 121 is smaller than the diameter D3 on the opposite side of the web 113 in the through hole 121.

[0031] The diameter D2 on the web 113 side of the through hole 121, that is, the diameter of the top surface of the frustoconical hole portion 122, is set to be larger than the diameter D1 of the first bolt hole 114 in the web 113 (D2 > D1). The diameter D3 on the side of the through hole 121 opposite to the web 113, i.e., the diameter of the bottom surface of the frustoconical hole portion 122, and the diameter of the cylindrical hole portion 123 (the diameters of the top and bottom surfaces of the cylindrical hole portion 123) are set to be larger than the diameter D2 on the web 113 side of the through hole 121 (D3 > D2). Furthermore, the distance L1 from the bottom surface to the top surface of the frustoconical 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 composed of two frustoconical metal fittings 140 and a high-strength bolt 150. The frustoconical metal fitting 140 is a metal member having a hollow frustoconical shape with an open bottom and a closed top. That is, the frustoconical metal fitting 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 frustoconical 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 on the web 113 side of the through hole 121 of the wood reinforcement material 120 (slightly smaller than diameter D2) (D1 <D4<D2)。 In this embodiment, the diameter D2 on the web 113 side of the through hole 121 is set to 39 mm, but it is not limited to this. Furthermore, in this embodiment, the diameter D4 of the top surface of the frustoconical metal fitting 140 is set to 38 mm, but it is not limited to this.

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

[0035] Furthermore, in the state before the frustoconical 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 frustoconical metal fitting 140 is set to be greater than the inclination angle θ1 of the side wall of the frustoconical hole portion 122 of the through hole 121 (slightly greater than the inclination angle θ1) (θ2 > θ1). In this embodiment, the inclination angle θ2 of the side portion 141 of the frustoconical metal fitting 140 before it is placed in the through hole 121 of the wood reinforcing material 120 is set to 30°, but it is not limited to this.

[0036] Furthermore, in the frustoconical metal fitting 140, the side portion 141 is thinner than the top portion 142. In this embodiment, the side portion 141 is formed from a steel plate with a thickness of 1.6 mm, but it is not limited to this. Furthermore, in this embodiment, the top surface 142 is formed from a steel plate with a thickness of 3.2 mm, but it is not limited to this. The frustoconical metal fitting 140 of this embodiment is manufactured by welding together the side portion 141 and the top portion 142.

[0037] A second bolt hole 143 is formed in the top surface 142 of the frustoconical metal fitting 140, penetrating the top surface 142 in the thickness direction (front-to-back direction). The diameter D6 of the second bolt hole 143 is set to a diameter that allows the insertion of a 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] The high-strength bolt (high-tensile bolt) 150 is used in conjunction with a nut 151 and two washers 152. In this embodiment, the diameter (nominal diameter) of the shaft portion of the high-strength bolt 150 is set to 12 mm, but it is not limited to this. Furthermore, in this embodiment, the length of the shaft portion of the high-strength bolt 150 is set to 35 mm, but it is not limited to this.

[0039] When the wooden reinforcing material 120 is placed at 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 reinforcing material 120 coincide. Furthermore, when the frustoconical metal fitting 140 of the connecting means 130 is placed inside the through hole 121 in the wood reinforcing material 120, the center line of the through hole 121 in the wood reinforcing material 120 coincides with the center line of the second bolt hole 143 in the frustoconical metal fitting 140.

[0040] Of the two wooden reinforcing members 120, one wooden reinforcing member 120 is placed at a predetermined position on the front of the lower flange 112, and the other wooden reinforcing member 120 is placed at a predetermined position on the rear of the lower flange 112. Also, of the two frustoconical metal fittings 140, one frustoconical metal fitting 140 is placed in the through hole 121 of one wooden reinforcing member 120, and the other frustoconical metal fitting 140 is placed in the through hole 121 of the other wooden reinforcing member 120. In that state, a high-strength bolt 150 is inserted from the through-hole 121 in one of the wooden reinforcing members 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. Furthermore, in the present embodiment, the web 113 and the frustum-shaped metal object 140 are joined by the high-strength bolt 150. 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 frictionally joined.

[0042] Also, the surface (outer surface) of the side surface portion 141 of the frustum-shaped metal object 140 is the contact surface (second contact surface) with the side wall in the through-hole 121 of the wooden reinforcing member 120, and is a frustum surface that expands from the web 113 side toward the side opposite to the web 113. Therefore, in the state where the steel beam 110 and the two wooden reinforcing members 120 are connected by the connecting means 130, the wooden reinforcing member 120 is pressed against the web 113 by the side surface portion 141 in contact with the wooden reinforcing member 120. Furthermore, before the frustoconical metal fitting 140 is placed in the through hole 121, the inclination angle θ2 of the side portion 141 of the frustoconical metal fitting 140 is greater than the inclination angle θ1 of the side wall in the frustoconical hole portion 122 of the through hole 121 (θ2 > θ1). Also, in the frustoconical metal fitting 140, the side portion 141 is thinner than the top portion 142. Therefore, as the nut 151 is tightened onto the high-strength bolt 150, the side portion 141 deforms so that its inclination angle matches the inclination angle θ1 of the side wall in the frustoconical hole portion 122. In other words, when the steel beam 110 and the two wooden reinforcing members 120 are connected by the connecting means 130, the side wall in the frustoconical hole portion 122 and the surface (outer surface) of the side portion 141 come into close contact. This allows the side portion 141 to effectively press the wood reinforcing material 120 against the web 113. Thus, in the composite beam 100 of this embodiment, the steel beam 110 and the two wooden reinforcing members 120 can be integrated using only the connecting means 130, without the use of 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, comprising a steel beam 110 made of shaped steel having a web 113, a pair of wooden reinforcing members 120 provided along the length direction (left-right direction) of the steel beam 110 and sandwiching the web 113, and connecting means 130 that integrally connect the steel beam 110 and the pair of wooden reinforcing members 120, the wooden reinforcing members 120 having throughs that penetrate the width direction (front-back direction) of the steel beam 110. A through hole 121 is formed, and the connecting means 130 includes a metal fitting (frustoconical metal fitting 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 in the through hole 121 of the wood reinforcing material 120, and a high-strength bolt 150 provided across the through holes 221 in the pair of wood reinforcing materials 120, and the metal fitting (frustoconical metal fitting 140) and the web 113 are joined by the high-strength bolt 150.

[0044] Therefore, since the composite beam 100 is a steel beam 110 reinforced with a pair of wooden reinforcing members 120, it has higher strength than a steel beam and is suitable for medium- and high-rise buildings. Furthermore, the connecting means 130 includes a metal fitting (frustoconical metal fitting 140) that is joined to the web 113 while in contact with the side wall of the through hole 121 of the wood reinforcing material 120. Therefore, the metal fitting protects the through hole 121 and prevents displacement of the wood reinforcing material 120 relative to the steel beam 110, thus stably maintaining the reinforced state provided by the wood reinforcing material 120.

[0045] Furthermore, in the composite beam 100 of the first embodiment, the second contact surface (the surface (outer surface) of the side portion 141) can be a frustoconical surface that extends from the web 113 side toward the opposite side of the web 113.

[0046] With this configuration, the second contact surface (the surface of the side portion 141 (outer surface)) of the metal fitting (frustoconical metal fitting 140) is a frustoconical surface, so by tightening the high-strength bolt 150, the wooden reinforcing material 120 is pulled to a certain position. In other words, by tightening the high-strength bolt 150, it becomes possible to press the wooden reinforcing material 120 against the web 113. Therefore, it is possible to integrate the steel beam 110 and the wooden reinforcing material 120 using only the connecting means 130, without using adhesives or the like.

[0047] Furthermore, in the composite beam 100 of the first embodiment, the through hole 121 includes a frustoconical hole portion 122, and the connecting means 130 comprises a frustoconical metal fitting 140 as the metal fitting, having a top surface portion 142 into which a bolt hole (second bolt hole 143) into which a high-strength bolt 150 is inserted is formed, 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 made the second contact surface which is the contact surface with the side wall of the frustoconical hole portion 122, and in the state before tightening the high-strength bolt 150, it is possible to make the inclination angle θ2 of the side surface portion 141 greater than the inclination angle θ1 of the side wall of the frustoconical hole portion 122.

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

[0049] In the first embodiment, in order to ensure that the wood reinforcing material 120 is pulled to a certain position by tightening the high-strength bolt 150, the inclination angle θ2 of the side portion 141 of the frustoconical metal fitting 140 was made larger than the inclination angle θ1 of the side wall of the frustoconical hole portion 122 (θ2>θ1) before tightening the high-strength bolt 150, but this is not the only possible approach. In order to ensure that the wood reinforcing material 120 is pulled to a certain position by tightening the high-strength bolt 150, for example, the diameter D4 of the top surface of the frustoconical metal fitting 140 (the diameter D4 of the top portion 142) may be made larger than the diameter D2 on the web 113 side of the through hole 121 (the diameter D2 on the web 113 side of the frustoconical hole portion 122) (D4>D2).

[0050] By making the diameter D4 of the top surface of the frustoconical metal fitting 140 larger than the diameter D2 on the web 113 side of the through hole 121, as the nut 151 is tightened onto the high-strength bolt 150, the side wall of the frustoconical hole 122 is shaved down, causing the frustoconical hole 122 to deform, so that the diameter D2 on the web 113 side of the through hole 121 matches the diameter D4 of the top surface of the frustoconical metal fitting 140. In other words, when the steel beam 110 and the two wooden reinforcing members 120 are connected by the connecting means 130, the side wall of the frustoconical hole 122 (at least the portion of the side wall on the web 113 side) and the surface of the side portion 141 (at least the portion of the surface on the web 113 side) come into close contact. This makes it possible for the side portion 141 to effectively press the wooden reinforcing member 120 against the web 113.

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

[0052] <Second Embodiment> 《Composite beam》 Figure 4 is a cross-sectional view showing an example of the composite beam 200 in the second embodiment. Figure 5 is an exploded cross-sectional view showing an example of the composite beam 200 in 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 made up of a steel beam 210, two wooden reinforcing members 220 that reinforce the steel beam 210, and connecting means 230 that connect the steel beam 210 and the two wooden reinforcing members 220.

[0053] Steel beam The steel beam 210 is constructed from H-shaped steel. Specifically, the steel beam 210 has an upper flange 211, a lower flange 212, and a web 213. Note that the structural steel (steel material) that makes up the steel beam 210 is not limited to H-shaped steel; any structural steel having a web 213 is acceptable. The web 213 has a plurality of first bolt holes 214 that penetrate through the web 213 in the thickness direction (front-to-back direction). These plurality of first bolt holes 214 are provided at predetermined intervals in the length direction (left-to-right direction) of the steel beam 210. The diameter D1 of the first bolt hole 214 is set to a diameter that allows for the insertion of the 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 it is not limited to this.

[0054] Wood-based reinforcing material The wood reinforcement material 220 is made of laminated timber. However, the wood material (wood) that makes up the wood reinforcement material 220 is not limited to laminated timber, but may also be other types of wood materials such as solid wood or LVL. The wooden reinforcing members 220 are provided along the length of the steel beam 210, and are attached to the steel beam 210 with their lower surfaces in contact with the lower flange 212 of the steel beam 210, and one of their surfaces (both sides in the thickness direction (front-to-back direction) of the wooden reinforcing members 220) in contact with the web 213 of the steel beam 210. In other words, the web 213 is sandwiched between two wooden reinforcing members 220.

[0055] The height dimension (vertical dimension) of the wooden reinforcement member 220 is set to be shorter than the height dimension of the web 213 on the steel beam 210 (the distance between the upper flange 211 and the lower flange 212 on the steel beam 210). The length dimension (horizontal dimension) of the wood reinforcement material 220 is set to be shorter than the length dimension of the steel beam 210. The thickness dimension (dimension in the front-to-back direction) of the wood reinforcement material 220 is set such that one of its surfaces is in contact with the web 213 of the steel beam 210, and the other of its surfaces is located outside the flanges 211 and 212 of the steel beam 210 (on the opposite side from the web 113).

[0056] The wooden reinforcing member 220 has a plurality of through holes 221 that penetrate through the wooden reinforcing member 220 in the thickness direction (front-to-back direction). These plurality of through holes 221 are provided at predetermined intervals in the length direction (left-to-right direction) of the wooden reinforcing member 220, corresponding to each first bolt hole 214 of the steel beam 210. The through hole 221 consists of a frustoconical hole portion 222 and a cylindrical hole portion 223 that communicate with each other. In the first embodiment, the frustoconical hole portion 122 is located on the web 113 side than the cylindrical hole portion 123, whereas in the second embodiment, the cylindrical hole portion 223 is located on the web 213 side than the frustoconical hole portion 222.

[0057] The frustoconical hole 222 is formed on the side of the wood reinforcement material 220 opposite to the web 213, such that its height direction (the height direction of the frustocone, i.e., the direction perpendicular to the top and bottom surfaces of the frustocone) is parallel to the thickness direction of the wood reinforcement material 220, and that its top surface (the top surface of the frustocone) is located closer to the web 213 than its bottom surface (the bottom surface of the frustocone). Furthermore, the cylindrical hole portion 223 is formed in the portion of the wood reinforcing material 220 on the web 213 side, such 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 reinforcing material 220, and that it is continuous with the top surface of the frustoconical hole portion 222. Therefore, the diameter D2 on the web 213 side of the through hole 221 is different from the diameter D3 on the opposite side of the web 213 in the through hole 221. Specifically, the diameter D2 on the web 213 side of the through hole 221 is smaller than the diameter D3 on the opposite side of the web 213 in the through hole 221.

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

[0059] 《Connection means》 The connecting means 230 is composed of two frustoconical metal fittings 240, two cylindrical metal fittings 260, and a high-strength bolt 250. In the first embodiment, the connecting means 130 is equipped with a frustoconical metal fitting 140, whereas in the second embodiment, the connecting means 230 is equipped with a frustoconical metal fitting 240 and a cylindrical metal fitting 260.

[0060] The frustoconical metal fitting 240 is a metal component that has a hollow frustoconical shape with an open bottom and a closed top. In other words, the frustoconical metal fitting 240 has a side portion 241 and a top portion 242. The cylindrical metal fitting 260 is, for example, a steel pipe. The frustoconical metal fitting 240 is disposed within the frustoconical hole portion 222 of the through hole 221 of the wood reinforcing material 220, and the cylindrical metal fitting 260 is inserted into the cylindrical hole portion 223 of the through hole 221. That is, in the connecting means 230 of the second embodiment, one end face of the cylindrical metal fitting 260 (the end face on the web 213 side) is the contact surface with the web 213 (first contact surface), and the surface of the side portion 241 of the frustoconical metal fitting 240 (outer surface) 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 ~21~ 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 a 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 it is not limited to this. Furthermore, in this embodiment, the length of the shaft portion of the high-strength bolt 250 is set to 120 mm, but it is not limited to this.

[0068] When the wooden reinforcing material 220 is placed at 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 coincides with the center line of the through hole 221 in the wooden reinforcing material 220. Furthermore, when the frustoconical metal fitting 240 and cylindrical metal fitting 260 of the connecting means 230 are placed inside the through hole 221 in the wood reinforcing material 220, the center line of the through hole 221 in the wood reinforcing material 220 coincides with the center line of the second bolt hole 243 in the frustoconical metal fitting 240 and the center line of the hollow portion of the cylindrical metal fitting 260.

[0069] Of the two wooden reinforcing members 220, one wooden reinforcing member 220 is placed at a predetermined position on the front of the lower flange 212, and the other wooden reinforcing member 220 is placed at a predetermined position on the rear of the lower flange 212. Also, of the two frustoconical metal fittings 240, one frustoconical metal fitting 240 is placed in the through hole 221 of one wooden reinforcing member 220, and the other frustoconical metal fitting 240 is placed in the through hole 221 of the other wooden reinforcing member 220. Furthermore, of the two cylindrical metal fittings 260, one cylindrical metal fitting 260 is positioned within the through hole 221 in one of the wooden reinforcing members 220, on the web 213 side of the one frustoconical metal fitting 240, while the other cylindrical metal fitting 260 is positioned within the through hole 221 in the other wooden reinforcing member 220, on the web 213 side of the other frustoconical metal fitting 240. In that state, insert a high-strength bolt 250 from the through-hole 221 in one wooden reinforcing member 220 toward the through-hole 221 in the other wooden reinforcing member 220, and thread a nut 251 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, pass the high-strength bolt 250 through one washer 252, the second bolt hole 243 in one frustum-shaped metal object 240, the hollow portion in one cylindrical metal object 260, the first bolt hole 214 in the web 213, the hollow portion in the other cylindrical metal object 260, the second bolt hole 243 in the other frustum-shaped metal object 240, and the other washer 252, and thread the nut 251 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 object 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 object 260 are in contact. In addition, in this state, the surface (outer surface) of the top face portion 242 in the frustum-shaped metal object 240 and the other end face (the end face opposite to the web 213) of the cylindrical metal object 260 are in contact. Furthermore, in the present embodiment, the web 213 and the cylindrical metal object 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 object 260 are frictionally joined. In addition, in this state, the surface (outer surface) of the top face portion 242 in the frustum-shaped metal object 240 and the other end face (the end face opposite to the web 213) of the cylindrical metal object 260 are frictionally joined.

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

[0072] Furthermore, in this embodiment, in the through-hole 221 of the wood reinforcing material 220, the diameter of the cylindrical hole portion 223 is the same as the diameter of the top surface of the frustoconical hole portion 222. If the diameter of the cylindrical hole matches the diameter of the base of the frustoconical hole, the cylindrical hole is formed by first creating a cylindrical recess in the wood reinforcement material, and then creating a frustoconical hole from the base of the recess. In this case, the depth dimension of the recess becomes the distance L2 from the base to the top of the cylindrical hole. If there is an error in the depth dimension of the recess, errors will also occur in the distance L1 from the base to the top of the frustoconical hole and in the diameter of the top of the frustoconical hole (the web-side diameter D2 in the through hole). In other words, if the timing of stopping the rotation of the drilling tool, such as a hole saw, is not precisely controlled when forming the cylindrical recess, errors will occur in the depth dimension of the recess, and consequently, errors will also occur in the distance L1 from the base to the top of the frustoconical hole and in the web-side diameter D2 in the through hole. In contrast, in this embodiment, since the diameter of the cylindrical hole portion 223 matches the diameter of the top surface of the frustoconical hole portion 222, the cylindrical hole portion 223 is formed by first forming a cylindrical hole that penetrates the wood reinforcing material in the thickness direction, and then forming the frustoconical hole portion 222. That is, when forming a cylindrical hole, it is sufficient to stop the rotation of the drilling tool at the moment the drilling tool penetrates the wood reinforcing material, so there is no need to precisely control the timing of stopping the rotation of the drilling tool when forming a cylindrical hole. Therefore, the formation of the through hole 221 is easier compared to the case where the diameter of the cylindrical hole portion matches the diameter of the bottom surface of the frustoconical hole portion.

[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, comprising a steel beam 210 made of shaped steel having a web 213, a pair of wooden reinforcing members 220 provided 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 members 220 have through holes 221 that penetrate the width direction (front-back direction) of the steel beam 210 A connecting means 230 is formed, and the connecting means 230 comprises a metal fitting (frustoconical metal fitting 240 and 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 in the through hole 221 of the wood reinforcing material 220, and a high-strength bolt 250 provided across the through holes 221 in the pair of wood reinforcing materials 220, and the metal fitting (cylindrical metal fitting 260) and the web 213 are joined by the high-strength bolt 250.

[0074] Therefore, since the composite beam 200 is a steel beam 210 reinforced with a pair of wooden reinforcing members 220, it has higher strength than a steel beam and is suitable for medium- and high-rise buildings. Furthermore, the connecting means 230 includes metal fittings (frustoconical fittings 240 and cylindrical fittings 260) that are joined to the web 213 while in contact with the side wall of the through hole 221 of the wood reinforcing material 220. Therefore, the metal fittings protect the through hole 221 and prevent displacement of the wood reinforcing material 220 relative to the steel beam 210, thereby stably maintaining the reinforced state provided by the wood reinforcing material 220.

[0075] Furthermore, in the composite beam 200 of the second embodiment, the second contact surface (the surface (outer surface) of the side portion 241) can be a frustoconical surface that extends from the web 213 side toward the opposite side of the web 213.

[0076] With this configuration, the second contact surface (the surface (outer surface)) of the metal fitting (frustoconical metal fitting 240) is a frustoconical surface, so by tightening the high-strength bolt 250, the wood reinforcing material 220 is pulled to a certain position. In other words, by tightening the high-strength bolt 250, it becomes possible to press the wood reinforcing material 220 against the web 213. Therefore, it is possible to integrate the steel beam 210 and the wood reinforcing material 220 using only the connecting means 230, without using adhesives or the like.

[0077] Furthermore, in the composite beam 200 of the second embodiment, the through hole 221 includes a frustoconical hole portion 222, and the connecting means 230 comprises a frustoconical metal fitting 240 as the metal fitting, having a top surface portion 242 into which a bolt hole (second bolt hole 243) into which a high-strength bolt 250 is inserted is formed, 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 made the second contact surface which is the contact surface with the side wall of the frustoconical hole portion 222, and in the state before tightening the high-strength bolt 250, it is possible to make the inclination angle θ2 of the side surface portion 241 greater than the inclination angle θ1 of the side wall of the frustoconical hole portion 222.

[0078] With this configuration, tightening the high-strength bolts 250 deforms the side portion 241, making it possible to match the inclination angle of the side portion 241 to the inclination angle θ1 of the side wall. As a result, tightening the high-strength bolts 250 reliably pulls the wood reinforcement material 220 to a fixed position, thereby enabling the function of the second contact surface (the function of pressing the wood reinforcement material 220 against the web 213) to be effectively performed.

[0079] Furthermore, in the composite beam 200 of the second embodiment, the through hole 221 includes a frustoconical hole portion 222 and a cylindrical hole portion 223 formed on the web 213 side of the frustoconical hole portion 222 and communicating with the frustoconical hole portion 222, and the connecting means 230 includes, as the metal fittings, a frustoconical metal fitting 241 provided in the frustoconical hole portion 222 and a cylindrical metal fitting 260 inserted into the cylindrical hole portion 223, and it is possible to make the diameter of the cylindrical hole portion 223 coincide with the diameter D2 on the web 213 side of the frustoconical hole portion 222.

[0080] This configuration facilitates the formation of the through-hole 221.

[0081] Furthermore, in the composite beam 200 of the second embodiment, the length dimension L4 of the cylindrical metal fitting 260 can be set to be longer than the length dimension L2 of the cylindrical hole portion 223, and the second contact surface (the surface (outer surface) of the side portion 241) can be set to be shorter than the dimension to which it contacts the side wall of the frustoconical hole portion 222 after the high-strength bolt 250 has been tightened. By configuring it in this way, the length dimension L4 of the cylindrical metal fitting 260 can be set to an appropriate dimension. Therefore, even if a cylindrical hole 223 communicating with the frustoconical hole 222 is provided on the web 213 side of the frustoconical hole 222, the wood reinforcing material 220 can be reliably pulled to a certain position by tightening the high-strength bolt 250, thus enabling the function of the second contact surface (the function of pressing the wood reinforcing material 220 against the web 213) to be effectively performed.

[0082] <Third Embodiment> 《Composite beam》 Figure 6 is a cross-sectional view showing an example of the composite beam 300 in the third embodiment. Figure 7 is an exploded cross-sectional view showing an example of the composite beam 300 in 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 made up of a steel beam 310, two wooden reinforcing members 320 that reinforce the steel beam 310, and connecting means 330 that connect the steel beam 310 and the two wooden reinforcing members 320.

[0083] Steel beam The steel beam 310 is constructed from H-shaped steel. Specifically, the steel beam 310 has an upper flange 311, a lower flange 312, and a web 313. Note that the structural steel (steel material) that makes up the steel beam 310 is not limited to H-shaped steel; any structural steel having a web 313 is acceptable. The web 313 has a plurality of first bolt holes 314 that penetrate through the web 313 in the thickness direction (front-to-back direction). These plurality of first bolt holes 314 are provided at predetermined intervals in the length direction (left-to-right direction) of the steel beam 310. The diameter D1 of the first bolt hole 314 is set to a diameter that allows for the insertion of the high-strength bolt 350, which will be described later. In this embodiment, the diameter D1 of the first bolt hole 314 is set to 17 mm, but it is not limited to this.

[0084] Wood-based reinforcing material The wood reinforcement material 320 is made of laminated timber. However, the wood material (wood) that makes up the wood reinforcement material 320 is not limited to laminated timber, but may also be other types of wood materials such as solid wood or LVL. The wooden reinforcing members 320 are provided along the length of the steel beam 310, and are attached to the steel beam 310 with their lower surfaces in contact with the lower flange 312 of the steel beam 310, and one of their surfaces (both sides in the thickness direction (front-to-back direction) of the wooden reinforcing members 320) in contact with the web 313 of the steel beam 310. In other words, the web 313 is sandwiched between two wooden reinforcing members 320.

[0085] The height dimension (vertical dimension) of the wood reinforcement member 320 is set to be shorter than the height dimension of the web 313 on the steel beam 310 (the distance between the upper flange 311 and the lower flange 312 on the steel beam 310). The length dimension (horizontal dimension) of the wood reinforcement material 320 is set to be shorter than the length dimension of the steel beam 310. The thickness dimension (dimension in the front-to-back direction) of the wood reinforcement material 320 is set such that one of its surfaces is in contact with the web 313 of the steel beam 310, and the other of its surfaces is located outside the flanges 311 and 312 of the steel beam 310 (on the opposite side from the web 113).

[0086] The wooden reinforcing member 320 has a plurality of through holes 321 that penetrate through the wooden reinforcing member 320 in the thickness direction (front-to-back direction). These plurality of through holes 321 are provided at predetermined intervals in the length direction (left-to-right direction) of the wooden reinforcing member 320, corresponding to each first bolt hole 314 of the steel beam 310. The through hole 321 consists of a frustoconical hole portion 322, a cylindrical hole portion (first cylindrical hole portion) 323, and a second cylindrical hole portion 324, all of which are in communication with each other. In the first embodiment, the frustoconical hole portion 122 is located on the web 113 side of the cylindrical hole portion 123, whereas in the third embodiment, the cylindrical hole portion 323 is located on the web 313 side of the frustoconical hole portion 322. Furthermore, in the third embodiment, in addition to the frustoconical 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 located on the opposite side from the web 313 than the frustoconical hole portion 322.

[0087] The frustoconical hole 322 is formed in the central part of the wood reinforcement material 320 in the front-to-back direction, such that its height direction (the height direction of the frustocone, i.e., the direction perpendicular to the top and bottom surfaces of the frustocone) is parallel to the thickness direction of the wood reinforcement material 320, and that its top surface (the top surface of the frustocone) is located closer to the web 313 than its bottom surface (the bottom surface of the frustocone). Furthermore, the cylindrical hole 323 is formed in the portion of the wood reinforcing material 320 on the web 313 side, such 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 reinforcing material 320, and that it is continuous with the top surface of the frustoconical hole 322. Furthermore, the second cylindrical hole 324 is formed on the side of the wood reinforcing material 320 opposite to the web 313, such 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 reinforcing material 320, and that it is continuous with the bottom surface of the frustoconical hole 322. Therefore, the diameter D2 on the web 313 side of the through hole 321 is different from the diameter D3 on the opposite side of the web 313 in the through hole 321. Specifically, the diameter D2 on the web 313 side of the through hole 321 is smaller than the diameter D3 on the opposite side of the web 313 in the through hole 321.

[0088] The diameter D2 on the web 313 side of the through hole 321, that is, the diameter of the top surface of the frustoconical 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 to be larger than the diameter D1 of the first bolt hole 314 in the web 313 (D2 > D1). The diameter D3 on the side of the through hole 321 opposite to the web 313, i.e., the diameter of the bottom surface of the frustoconical hole portion 322, and the diameter of the second cylindrical hole portion 324 (the diameters of the top and bottom surfaces of the second cylindrical hole portion 324) are set to be larger than the diameter D2 on the web 313 side of the through hole 321 (D3 > D2). Furthermore, the distance L1 from the bottom surface to the top surface of the frustoconical 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 composed of two frustoconical metal fittings 340, two cylindrical metal fittings 360, and a high-strength bolt 350. In the first embodiment, the connecting means 130 is equipped with a frustoconical metal fitting 140, whereas in the third embodiment, the connecting means 330 is equipped with a frustoconical metal fitting 340 and a cylindrical metal fitting 360.

[0090] The frustoconical metal fitting 340 is manufactured by forming a hole (second bolt hole 343) through a solid, frustoconical metal member. 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 material 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 web 313 side) 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 (slightly smaller than) the diameter D2 on the web 313 side in the through-hole 321 of the wooden reinforcing material 320 (D1 < D7 < D2). In this 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 this 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 (slightly smaller than) the diameter D2 on the web 313 side in the through-hole 321 of the wooden reinforcing material 320 (D1 < D4 < D2). In this 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 material 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 323 in the through-hole 321 (L4 < L2).

[0094] Also, in the state before disposing the frustum-shaped metal object 340 in 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 the 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 the 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 reinforcing material 320 is placed at 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 coincides with the center line of the through hole 321 in the wooden reinforcing material 320. Furthermore, when the frustoconical metal fitting 340 and cylindrical metal fitting 360 of the connecting means 330 are placed inside the through hole 321 in the wood reinforcing material 320, the center line of the through hole 321 in the wood reinforcing material 320 coincides with the center line of the second bolt hole 343 in the frustoconical metal fitting 340 and the center line of the hollow portion of the cylindrical metal fitting 360.

[0098] Of the two wooden reinforcing members 320, one wooden reinforcing member 320 is placed at a predetermined position on the front of the lower flange 312, and the other wooden reinforcing member 320 is placed at a predetermined position on the rear of the lower flange 312. Also, of the two frustoconical metal fittings 340, one frustoconical metal fitting 340 is placed in the through hole 321 of one wooden reinforcing member 320, and the other frustoconical metal fitting 340 is placed in the through hole 321 of the other wooden reinforcing member 320. Furthermore, of the two cylindrical metal fittings 360, one cylindrical metal fitting 360 is positioned within the through hole 321 in one of the wooden reinforcing members 320, on the web 313 side of the one frustoconical metal fitting 340, while the other cylindrical metal fitting 360 is positioned within the through hole 321 in the other wooden reinforcing member 320, on the web 313 side of the other frustoconical metal fitting 340. In that state, a high-strength bolt 350 is inserted from the through-hole 321 in one wooden reinforcing member 320 toward the through-hole 321 in the other wooden 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 wooden 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 fitting 340, the hollow portion in one cylindrical metal fitting 360, the first bolt hole 314 in the web 313, the hollow portion in the other cylindrical metal fitting 360, the second bolt hole 343 in the other frustum-shaped metal fitting 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 wooden reinforcing members 320 are integrally connected by the connecting means 330.

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

[0100] Furthermore, the side surface of the frustoconical metal fitting 340 is the contact surface (second contact surface) with the side wall of the through hole 321 of the timber reinforcing material 320, and is a frustoconical surface that extends from the web 313 side toward the opposite side of the web 313. Therefore, when the steel beam 310 and the two timber reinforcing materials 320 are connected by the connecting means 330, the timber reinforcing material 320 is pressed against the web 313 by the side surface of the frustoconical metal fitting 340 that is in contact with the timber reinforcing material 320. Furthermore, before the frustoconical metal fitting 340 is placed in the through hole 321, the inclination angle θ2 of the side surface of the frustoconical metal fitting 340 is greater than the inclination angle θ1 of the side wall of the frustoconical hole portion 322 of the through hole 321 (θ2 > θ1). The frustoconical metal fitting 340 is manufactured by forming a hole (second bolt hole 343) that penetrates a solid metal member (for example, steel). Therefore, as the nut 351 is tightened onto the high-strength bolt 350, the side wall of the frustoconical hole portion 322 is worn away, and the frustoconical hole portion 322 deforms, so that the inclination angle of the side wall of the frustoconical hole portion 322 matches the inclination angle θ2 of the side surface of the frustoconical metal fitting 340. In other words, when the steel beam 310 and the two wooden reinforcing members 320 are connected by the connecting means 330, the side wall of the frustoconical hole 322 and the side surface of the frustoconical metal fitting 340 come into close contact. This allows the side surface of the frustoconical metal fitting 340 to effectively press the wooden reinforcing members 320 against the web 313. Thus, in the composite beam 300 of this embodiment, the steel beam 310 and the two wooden reinforcing members 320 can be integrated using only the connecting means 330, without the use of adhesives or the like.

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

[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, comprising a steel beam 310 made of shaped steel having a web 313, a pair of wooden reinforcing members 320 provided along the longitudinal 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 members 320 having through holes 321 that penetrate the steel beam 310 in the width direction (front-back direction) A connection means 330 is formed, and the connection means 330 comprises a metal fitting (frustoconical metal fitting 340 and 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 in the through hole 321 of the wood reinforcing material 320, and a high-strength bolt 350 provided across the through holes 321 in the pair of wood reinforcing materials 320, and the metal fitting (cylindrical metal fitting 360) and the web 313 are joined by the high-strength bolt 350.

[0103] Therefore, since the composite beam 300 is a steel beam 310 reinforced with a pair of wooden reinforcing members 320, it has higher strength than a steel beam and is suitable for medium- and high-rise buildings. Furthermore, the connecting means 330 includes metal fittings (frustoconical fittings 340 and cylindrical fittings 360) that are joined to the web 313 while in contact with the side wall of the through hole 321 of the wood reinforcing material 320. Therefore, the metal fittings protect the through hole 321 and prevent displacement of the wood reinforcing material 320 relative to the steel beam 310, thereby stably maintaining the reinforced state provided by the wood reinforcing material 320.

[0104] Furthermore, in the composite beam 300 of the third embodiment, the second contact surface (the side surface of the frustoconical metal fitting 340) can be a frustoconical surface that extends 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 (frustoconical metal fitting 340) is a frustoconical surface, so by tightening the high-strength bolt 350, the wooden reinforcing material 320 is pulled to a certain position. In other words, by tightening the high-strength bolt 350, it becomes possible to press the wooden reinforcing material 320 against the web 313. Therefore, it is possible to integrate the steel beam 310 and the wooden reinforcing material 320 using only the connecting means 330, without using adhesives or the like.

[0106] Furthermore, in the composite beam 300 of the third embodiment, the through hole 321 includes a frustoconical hole portion 222, and the connecting means 330 is provided with a frustoconical metal fitting 340 as the metal fitting, which is a solid metal body with a bolt hole (second bolt hole 343) into which a high-strength bolt 350 is inserted, and the side surface of the frustoconical metal fitting 340 is the second contact surface which is the contact surface with the side wall of the frustoconical hole portion 322, and it is possible to make the inclination angle θ2 of the side surface greater than the inclination angle θ1 of the side wall in the state before tightening the high-strength bolt 350.

[0107] With this configuration, tightening the high-strength bolt 350 deforms the side wall of the frustoconical hole 322, making it possible to match the inclination angle of the side wall to the inclination angle θ2 of the side surface of the frustoconical metal fitting 340. As a result, the side wall of the frustoconical hole 322 and the second contact surface (the side surface of the frustoconical metal fitting 340) come into close contact, allowing the function of the second contact surface (the function of pressing the wood reinforcement material 320 against the web 313) to be effectively performed.

[0108] <Fourth Embodiment> 《Composite beam》 Figure 8 is a front view showing an example of a composite beam 400 in the fourth embodiment. Figure 9 is a diagram showing an example of the composite beam 400 in the fourth embodiment, and is a cross-sectional view taken along line AA in Figure 8. Figure 10 is a diagram showing an example of the composite beam 400 in the fourth embodiment, and is an exploded cross-sectional view taken along line AA in Figure 8. Figure 11 is a diagram showing an example of the composite beam 400 in the fourth embodiment, and is a cross-sectional view along line BB in Figure 8. Figure 12 is a diagram showing an example of the composite beam 400 in the fourth embodiment, and is an exploded cross-sectional view along line BB in Figure 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 connecting means 430 that connect the steel beam 410 and the two wooden reinforcing members 420.

[0109] Steel beam The steel beam 410 is constructed from H-shaped steel. Specifically, the steel beam 410 has an upper flange 411, a lower flange 412, and a web 413. Note that the structural steel (steel material) that makes up the steel beam 410 is not limited to H-shaped steel; any structural steel having a web 413 is acceptable. The web 413 has a plurality of first bolt holes 414 that penetrate through the web 413 in the thickness direction (front-to-back direction). These plurality of first bolt holes 414 are provided at predetermined intervals in the length direction (left-to-right direction) of the steel beam 410. The diameter D1 of the first bolt hole 414 is set to a diameter that allows for the insertion of the 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 it is not limited to this.

[0110] Furthermore, the web 413 has a plurality of third bolt holes 415 that penetrate through the web 413 in the thickness direction (front-to-back direction). These plurality of third bolt holes 415 are provided at predetermined intervals in the longitudinal direction (left-to-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 longitudinal direction (left-to-right direction) of the steel beam 410. The diameter of the third bolt hole 415 is set to a diameter that allows the second bolt 470, which will be described later, to be inserted.

[0111] Wood-based reinforcing material The wood reinforcement material 420 is made of laminated timber. However, the wood material (wood) that makes up the wood reinforcement material 420 is not limited to laminated timber, but may also be other types of wood materials such as solid wood or LVL. The wooden reinforcing members 420 are provided along the length of the steel beam 410, and are attached to the steel beam 410 with their lower surfaces in contact with the lower flange 412 of the steel beam 410, and one of their surfaces (both sides in the thickness direction (front-to-back direction) of the wooden reinforcing members 420) in contact with the web 413 of the steel beam 410. In other words, the web 413 is sandwiched between two wooden reinforcing members 420.

[0112] The height dimension (vertical dimension) of the wood reinforcement member 420 is set to be shorter than the height dimension of the web 413 on the steel beam 410 (the distance between the upper flange 411 and the lower flange 412 on the steel beam 410). The length dimension (horizontal dimension) of the wood reinforcement material 420 is set to be shorter than the length dimension of the steel beam 410. The thickness dimension (dimension in the front-to-back direction) of the wood reinforcement material 420 is set such that one of its surfaces is in contact with the web 413 of the steel beam 410, and the other of its surfaces is located outside the flanges 411 and 412 of the steel beam 410 (on the opposite side from the web 113).

[0113] The wooden reinforcing member 420 has a plurality of through holes 421 that penetrate through the wooden reinforcing member 420 in the thickness direction (front-to-back direction). These plurality of through holes 421 are provided at predetermined intervals in the length direction (left-to-right direction) of the wooden reinforcing member 420, corresponding to each first bolt hole 414 of the steel beam 410. The through-hole 421 is a cylindrical hole, formed such 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 on the web 413 side of the through hole 421 and the diameter D3 on the opposite side of the web 413 in the through hole 421 are the same (D2 = D3). Furthermore, the diameter D2 on the web 413 side of the through hole 421 is set to be larger than the diameter D1 of the first bolt hole 414 in the web 413 (D2 > D1).

[0114] Furthermore, the wooden reinforcing material 420 has a plurality of fourth bolt holes 425 formed therein that penetrate the wooden reinforcing material 420 in the thickness direction (front-to-back direction). These plurality of fourth bolt holes 425 are provided at predetermined intervals in the length direction (left-to-right direction) of the wooden reinforcing material 420, corresponding to each third bolt hole 415 of the steel beam 410. The diameter of the fourth bolt hole 425 is set to a diameter that allows the second bolt 470, which will be described later, to be inserted. Furthermore, of the ends of the fourth bolt hole 425 (front end and rear end), the end opposite to the web 413 is a countersunk portion 426.

[0115] 《Connection means》 The connecting means 430 is composed of two cylindrical metal fittings 440, a high-strength bolt 450, and a second bolt 470. The cylindrical metal fitting 440 is a metal member having a hollow cylindrical shape with an open bottom and a closed top. That is, the cylindrical metal fitting 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 reinforcing material 420.

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

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

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

[0119] A second bolt hole 443 is formed in the top surface 442 of the cylindrical metal fitting 440, penetrating the top surface 442 in the thickness direction (front-to-back direction). The diameter D6 of the second bolt hole 443 is set to a diameter that allows the insertion of a 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] High-strength bolts (high-tensile bolts) 450 are used in conjunction with nuts 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 it is not limited to this. Furthermore, in this embodiment, the length of the shaft portion of the high-strength bolt 450 is set to 60 mm, but it is not limited to this.

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

[0122] When the wooden reinforcing material 420 is placed at 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 reinforcing 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 reinforcing material 420. Furthermore, when the cylindrical metal fitting 440 of the connecting means 430 is placed inside the through hole 421 in the wood reinforcing material 420, the center line of the through hole 421 in the wood reinforcing material 420 coincides with the center line of the second bolt hole 443 in the cylindrical metal fitting 440.

[0123] Of the two wooden reinforcing members 420, one wooden reinforcing member 420 is placed at a predetermined position on the front of the lower flange 412, and the other wooden reinforcing member 420 is placed at a predetermined position on the rear of the lower flange 412. Also, of the two cylindrical metal fittings 440, one cylindrical metal fitting 440 is placed in the through hole 421 of one wooden reinforcing member 420, and the other cylindrical metal fitting 440 is placed in the through hole 421 of the other wooden reinforcing member 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, and 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, and 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 to be smaller than the diameter D2 on the side of the web 413 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 fitting 440 are joined by high-strength bolts 450. Therefore, when 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 portion 442 of the cylindrical metal fitting 440 are joined by friction.

[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 web 413 and the wood reinforcing material 420 are joined by the second bolt 470. Therefore, when the steel beam 410 and the two wood reinforcing materials 420 are connected by the connecting means 430, one of the second washers 472 (and the head of the second bolt 470) presses one of the wood reinforcing materials 420 against the web 413, and the other second washer 472 (and the second nut 471) presses the other wood reinforcing material 420 against the web 413. Thus, in the composite beam 400 of this embodiment, the steel beam 410 and the two wooden reinforcing members 420 can be integrated using only the connecting means 430, without the use of 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, comprising a steel beam 410 made of shaped steel having a web 413, a pair of wooden reinforcing members 420 provided 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 having a penetration in the width direction (front-back direction) of the steel beam 410 A through hole 421 is formed, and the connecting means 430 includes a metal fitting (cylindrical metal fitting 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 in the wood reinforcing material 420, and a high-strength bolt 450 provided across the through holes 421 in the pair of wood reinforcing materials 420, and the metal fitting (cylindrical metal fitting 440) and the web 413 are joined by the high-strength bolt 450.

[0128] Therefore, since the composite beam 400 is a steel beam 410 reinforced with a pair of wooden reinforcing members 420, it has higher strength than a steel beam and is suitable for medium- and high-rise buildings. Furthermore, the connecting means 430 includes a metal fitting (cylindrical metal fitting 440) that is joined to the web 413 while in contact with the side wall of the through hole 421 of the wood reinforcing material 420. Therefore, the metal fitting protects the through hole 421 and prevents displacement of the wood reinforcing material 420 relative to the steel beam 410 (displacement in a direction perpendicular to the width direction (front-to-back direction) of the steel beam 410), thus stably maintaining the reinforced state by the wood reinforcing material 420.

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

[0130] This configuration allows the second bolt 470 to press the wood reinforcement material 420 against the web 413. Therefore, it is possible to integrate the steel beam 410 and the wood reinforcement material 420 using only the connecting means 430, without the use of adhesives or the like.

[0131] Furthermore, in recent years, there has been a growing demand for achieving the Sustainable Development Goals (SDGs), and various initiatives are being undertaken in the construction industry. The composite beams 100, 200, 300, and 400 in the above embodiment 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 embodiment will have a long lifespan. Accordingly, the composite beams 100, 200, 300, and 400 in the above embodiment can contribute to achieving SDGs Goal 7 "Affordable and Clean Energy", Goal 11 "Sustainable Cities and Communities", Goal 13 "Climate Action", 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 frustoconical holes 123,223,323 Cylindrical holes 130,230,330,430 Connection means 140, 240, 340 frustoconical 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 structural steel having a web, A pair of wooden reinforcing members are provided along the length of the steel beam, sandwiching the web, The system includes a connecting means for integrally connecting the steel beam and the pair of wooden reinforcing members. The aforementioned wooden reinforcing material has through holes that penetrate in the width direction of the steel beam. The aforementioned connecting means is A metal fitting having a first contact surface which is the contact surface with the web, and a second contact surface which is the contact surface with the side wall of the through hole in the wood reinforcing material, The system includes a high-strength bolt provided across the through holes in the pair of wood reinforcing members, The metal fitting and the web are joined by the aforementioned high-strength bolts. The second contact surface is a frustoconical surface that extends from the web side toward the opposite side of the web. The through hole includes a frustoconical hole portion, The connecting means comprises a frustoconical metal fitting having a top surface portion in which bolt holes into which the high-strength bolts are inserted, and a side portion that is thinner than the top surface portion. The surface of the side portion is the second contact surface, which is the contact surface with the side wall in the frustoconical hole portion. In the state before tightening the high-strength bolt, the side portion has a greater angle of inclination than the side wall of the frustoconical hole portion. The through hole includes the frustoconical hole portion and a cylindrical hole portion formed on the web side of the frustoconical hole portion and communicating with the frustoconical hole portion. The connecting means comprises, as the metal fittings, a frustoconical metal fitting provided in the frustoconical hole and a cylindrical metal fitting inserted into the cylindrical hole. The diameter of the cylindrical hole is the same as the diameter of the web side of the frustoconical hole. The length dimension of the cylindrical metal fitting is, It is set to be longer than the length dimension of the cylindrical hole, A composite beam characterized in that, after tightening the high-strength bolt, the second contact surface is set to be shorter than the dimension to contact the side wall of the frustoconical hole.

2. A composite beam made of steel and wood, A steel beam made of structural steel having a web, A pair of wooden reinforcing members are provided along the length of the steel beam, sandwiching the web, The system includes a connecting means for integrally connecting the steel beam and the pair of wooden reinforcing members. The aforementioned wooden reinforcing material has through holes that penetrate in the width direction of the steel beam. The aforementioned connecting means is A metal fitting having a first contact surface which is the contact surface with the web, and a second contact surface which is the contact surface with the side wall of the through hole in the wood reinforcing material, The system includes a high-strength bolt provided across the through holes in the pair of wood reinforcing members, The metal fitting and the web are joined by the aforementioned high-strength bolts. The second contact surface is a frustoconical surface that extends from the web side toward the opposite side of the web. The through hole includes a frustoconical hole portion, The connecting means comprises a frustoconical metal fitting having a side portion and a top portion in which bolt holes into which the high-strength bolts are inserted. The surface of the side portion is the second contact surface, which is the contact surface with the side wall in the frustoconical hole portion. In the state before tightening the high-strength bolt, the diameter of the top surface is larger than the diameter of the web side in the frustoconical hole. The through hole includes the frustoconical hole portion and a cylindrical hole portion formed on the web side of the frustoconical hole portion and communicating with the frustoconical hole portion. The connecting means comprises, as the metal fittings, a frustoconical metal fitting provided in the frustoconical hole and a cylindrical metal fitting inserted into the cylindrical hole. The diameter of the cylindrical hole is the same as the diameter of the web side of the frustoconical hole. The length dimension of the cylindrical metal fitting is, It is set to be longer than the length dimension of the cylindrical hole, A composite beam characterized in that, after tightening the high-strength bolt, the second contact surface is set to be shorter than the dimension to contact the side wall of the frustoconical hole.

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