Beam structure

Abstract

To enable cost reduction of long-reach spanning frames.SOLUTION: A beam structure 1 includes a long, large cross-section structural member 200 formed by joining a pair of long beams 100 having a length consisting of a pair of beams 10 made of wood having a length of 4 m or more and 12 m or less, and a joint metal 20 connecting and joining the pair of beams 10 together by butting them together at one end in the longitudinal direction, facing each other in the thickness direction perpendicular to the longitudinal direction; a vertical portion 300 extending downward from the joint position of the pair of beams 10 in each long beam 100 in a direction perpendicular to the longitudinal direction of the beams 10, and a brace portion 400 connecting each end on both sides in the longitudinal direction of each long beam 100 to the vertical portion 300.SELECTED DRAWING: Figure 13

Description

[Technical field]

[0001] The present invention relates to a beam structure that forms a large-span frame in medium to large-scale wooden buildings, and in particular to a beam structure that enables cost reduction of large-span frames. [Background technology]

[0002] In recent years, the artificial forests planted after the war in Japan are now suitable for use as timber, but due to the stagnation and decline of the forestry industry, these forests have not been adequately maintained, so the use of timber is being actively promoted. In addition, a law promoting the use of timber in buildings has also recently been enacted. As a result, there is an increasing need to convert medium- to large-scale buildings that were previously constructed with steel frames or concrete structures into wooden buildings.

[0003] However, when considering fire resistance, strength, structural strength, etc., medium- to large-scale wooden buildings are inevitably more expensive than buildings made of steel frame (S) or concrete (RC).For this reason, the high cost is a major obstacle to the spread of medium- to large-scale wooden buildings, and there is a demand for the realization of medium- to large-scale wooden buildings at low cost.

[0004] That is, in medium- to large-scale buildings, depending on the purpose, scale, region, etc., they are often required to be semi-fireproof, or there are an increasing number of cases where they are planned as optional semi-fireproof buildings. For example, in the case of small wooden buildings such as houses, gypsum boards are often installed on the wood as a fireproof covering. However, when such gypsum boards are used, the wood cannot be seen from the outside, so the design of the wood is inferior. Therefore, in order to bring out the design and wood texture of the wood, it is possible to further attach decorative materials or boards to the gypsum boards, but this increases the cost. In addition, in medium- to large-scale buildings with large spans and large spaces, internal scaffolding is required to install the gypsum boards, which increases the construction cost. On the other hand, the design of wood can be ensured by the fire-spot design, which allows the wood to be exposed, but when the fire-spot design is applied to medium- to large-scale buildings with large spans and large spaces, the large fixed and live loads of medium- to large-scale buildings are combined, and in order to ensure strength and structural resistance, it is necessary to use custom-made large-section timber with a short side dimension of 20 cm or more, which results in high timber costs. In addition, the transportation costs of transporting large-section timber to the construction site are also high. In addition, with such custom-made large-section timber, custom-made metal fittings are required to be produced to join the truss structure for the large span, which further increases material costs.

[0005] Here, as shown in, for example, Patent Document 1, conventionally, in constructing a large span structure, a truss frame has often been adopted due to its structural stability. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2007-085061 A Summary of the Invention [Problem to be solved by the invention]

[0007] However, such truss beams require a large number of assembly parts, which increases production costs. Furthermore, the structure of the joints is complex, which makes assembly and construction time-consuming and costly, making it difficult to reduce costs.

[0008] Therefore, an object of the present invention is to provide a beam structure that enables low-cost construction of large-span framing structures in medium- to large-scale wooden buildings. [Means for solving the problem]

[0009] The beam structure of claim 1 comprises a long, large-section structural material formed by joining a pair of long beams made of wooden material having a length of 4 m or more and 12 m or less, and a pair of front and rear long beams made of connecting metal fittings that butt-join the pair of left and right beams at one end in the longitudinal direction, facing each other in the thickness direction perpendicular to the longitudinal direction, a vertical portion extending downward from the joint position of the pair of beams in a direction perpendicular to the longitudinal direction of the beams, and a pair of front and rear brace portions connecting the front and rear faces of the pair of long beams to the vertical portion at each end on both sides in the longitudinal direction.

[0010] The above beams are lumber with lengths of 4m or more and 12m or less, which corresponds to the lengths of so-called standardized lumber and generally distributed lumber, and therefore the numerical values ​​are not strict and include variations between products, and the inclusion of errors is not denied. Furthermore, there is no restriction on the type of wood, and it may be softwood such as cedar, cypress, pine (such as red pine), hemlock, fir, etc., or hardwood such as oak, chestnut, Japanese oak, beech, zelkova, etc. Generally, structural laminated lumber or structural laminated veneer lumber (LVL) is used due to its low cost, and it is large-section lumber (short side 15cm or more, cross-sectional area 300cm or more) with short sides (beam width) of 7.5cm or more and long sides (beam length) of 15cm or more. 2 Small or medium cross-section lumber other than those mentioned above is selected, for example, wood with a cross-section of 120 mm x 450 mm can be used. Alternatively, sawn lumber may be used, in which case lumber with a long side of usually 390 mm or less is used. Each beam usually has an insertion groove formed therein for inserting a metal joint, and the metal joint is inserted into the insertion groove and fixed to the beam, thereby connecting a pair of beams in a state of being joined in the length direction. It is preferable that each beam be of approximately the same length, but a difference in length of 30% or less is acceptable.

[0011] The above-mentioned connecting metal fittings have a plurality of through holes through which pins, screws, screws, etc. can be inserted, and are attached to each beam material using pins, screws, screws, etc. to connect a pair of beam materials by butting one end of each beam material in the longitudinal direction. Typically, the connecting metal fittings are inserted inside one end of each beam material in the longitudinal direction and fixed to each beam material with pins, screws, screws, etc. to connect the pair of beam materials together.

[0012] The above-mentioned long beam material is formed by connecting a pair of beam materials with their lengthwise ends butted together, i.e., with one end face of the beam materials in the longitudinal direction abutting, with the total length being 8 m or more and 24 m or less, by connecting a pair of beam materials each having a length of 4 m or more and 12 m or less. The above-mentioned long, large-section structural material is made by lining up a pair of long beams of approximately the same length in the thickness direction perpendicular to their length (the short side direction from the cross section), embracing each other, and then fastening the embracing beams together at multiple points using screws, bolts, etc. to join and fix the two together to create a large cross section.

[0013] The vertical section is provided on each pair of long beams at the front and rear of the long large cross-section structural member, and extends downward perpendicular to the longitudinal direction of the beams from the joint position between the pair of beams, and one end of the brace section in the longitudinal direction is attached to the lower side of the vertical section. It is preferably made of wood.

[0014] The brace section is made of steel or the like, and is attached to the design surface side and vertical part of each end of both sides in the longitudinal direction of each pair of long beams of the long and large cross-section structural material, connecting both ends of each long beam of the long and large cross-section structural material to the vertical part, and is attached diagonally to the beam and the vertical part perpendicular to its longitudinal direction. The attachment means for attaching the brace section to each end of each long beam opposite to the longitudinal connection side of the beam and the vertical part is not particularly limited, and for example, at both ends of the long and large cross-section structural material, a round steel is inserted in the thickness direction perpendicular to the longitudinal direction, and one end of each brace section is attached to both ends of the round steel in the longitudinal direction, so that each brace section can be attached to the design surface side of the side of both ends of the long beam in the longitudinal direction. Also, in the vertical section, by inserting round steel in the thickness direction perpendicular to the extending direction (length direction) and attaching the other end of each brace section in the length direction to both end portions of the round steel in the length direction, each brace section can be attached to the front and rear design surfaces of the vertical section. Alternatively, by inserting round steel in the width direction perpendicular to the extending direction of the vertical section and attaching the other end of each brace section in the length direction to both end portions of the round steel in the length direction, each brace section can be attached to the left and right side surfaces of the vertical section.

[0015] The beam structure of claim 2 further comprises a wood panel covering both the front and rear surfaces in the thickness direction perpendicular to the longitudinal direction of the long beam material and the underside perpendicular thereto at the connection parts of the pair of left and right beam materials constituting each of the long beam materials in the long-length, large-section structural material by the metal joints. The above-mentioned wood panel is attached to a pair of long beams in a long, large cross-section structural member using screws, bolts, etc., around the joint between each pair of long beams, thereby covering the three sides of the joint between the pair of beams, that is, covering the front design surface of one of the pair of long beams and the rear design surface of the other long beam, as well as the bottom surfaces of both the front and rear beams. Any material with a wood design can be used, such as structural plywood, structural panels, medium density fiberboard (MDF), particleboard (PB), cross laminated timber (CLT), etc., which are used as structural surface materials.

[0016] The beam structure of claim 3 comprises a long beam consisting of a pair of left and right beams made of wood having a length of 4 m or more and 12 m or less, and a connecting metal fitting connecting the pair of left and right beams together with one end of the beams butted together in the longitudinal direction, a vertical portion extending downward from the joint position between the pair of left and right beams in a direction perpendicular to the longitudinal direction of the beams, and a brace portion connecting the front and rear faces of the long beam to the vertical portion at each end on both sides in the longitudinal direction.

[0017] The above beams are lumber with lengths of 4m or more and 12m or less, which correspond to the lengths of so-called standardized lumber and generally distributed lumber, and therefore the numerical values ​​are not strict and include variations between products, and the inclusion of errors is not denied. There is no restriction on the type of wood, and it may be, for example, coniferous trees such as cedar, cypress, pine (red pine, etc.), hemlock, fir, etc., or broad-leaved trees such as oak, chestnut, Japanese oak, beech, zelkova, etc. Generally, structural laminated lumber or structural laminated veneer lumber (LVL) is used because of its low cost, and it is large-section lumber (short side 15cm or more, cross-sectional area 300cm or more) with short sides (beam width) of 7.5cm or more and long sides (beam length) of 15cm or more. 2Small or medium cross-section lumber other than those mentioned above is selected, for example, wood with a cross-section of 120 mm x 450 mm can be used. Alternatively, sawn lumber may be used, in which case lumber with a long side of usually 390 mm or less is used. Each beam usually has an insertion groove formed therein for inserting a metal joint, and a pair of beams are connected in a state of being joined in the length direction by inserting and fixing the metal joint into the insertion groove. It is preferable that each beam be of approximately the same length, but a difference in length of 30% or less is acceptable.

[0018] The above-mentioned connecting metal fittings have a plurality of through holes through which pins, screws, screws, etc. can be inserted, and are attached to each beam material using pins, screws, screws, etc. to connect a pair of beam materials by butting one end of each beam material in the longitudinal direction. Typically, the connecting metal fittings are inserted inside one end of each beam material in the longitudinal direction and fixed to each beam material with pins, screws, screws, etc. to connect the pair of beam materials together.

[0019] The above-mentioned long beam material is formed by connecting a pair of beam materials with their longitudinal ends butted together, i.e., with one end face of the beam materials in the longitudinal direction abutting, with the connecting metal fittings, and the total length is 8 m or more and 24 m or less by connecting a pair of beam materials each having a length of 4 m or more and 12 m or less.

[0020] The vertical section extends downward from the joint between the pair of beams in a direction perpendicular to the longitudinal direction of the beams, and is adapted to have one longitudinal end of the brace section attached thereto. The vertical section is preferably made of wood.

[0021] The brace section is made of steel or the like, and is attached to the design surface side and the vertical part of each end of the long beam in the longitudinal direction, connecting each end of the long beam in the longitudinal direction and the vertical part, and is attached diagonally to the beam and the vertical part perpendicular to the longitudinal direction. The attachment means for attaching the brace section to each end of the long beam opposite to the longitudinal connecting side and the vertical part is not particularly limited, and for example, at each end of the long beam in the longitudinal direction, a round steel bar is inserted in the thickness direction perpendicular to the longitudinal direction, and one end of each brace section is attached to each end of the round steel bar in the longitudinal direction, so that each brace section can be attached to the design surface side of the side of each end of the long beam in the longitudinal direction. Also, in the vertical section, by inserting round steel bars in the thickness direction perpendicular to the extending direction (length direction) of the vertical section and attaching the other end of each brace section in the length direction to both end portions of the round steel bars in the length direction, each brace section can be attached to the front and rear design surfaces of the vertical section. Alternatively, by inserting round steel bars in the width direction perpendicular to the extending direction of the vertical section and attaching the other end of each brace section in the length direction to both end portions of the round steel bars in the length direction, each brace section can be attached to the left and right side surfaces of the vertical section.

[0022] The beam structure of claim 4 further comprises a wood panel covering both the front and back surfaces in the thickness direction perpendicular to the longitudinal direction of the beam material and the underside perpendicular thereto at the connection portion between the pair of left and right beam material by the metal joints. The above-mentioned wood panel is attached using screws, bolts, etc. to cover the bottom and three perpendicular sides of the joint between a pair of left and right beams of a long beam, and can be made of any material that has a wooden design, such as structural plywood, structural panels, medium density fiberboard (MDF), particleboard (PB), cross laminated timber (CLT), etc., which are used as structural surface materials.

[0023] The vertical portion of the beam structure of claim 5 is made of wood. The above-mentioned wood is not particularly limited in type, and may be, for example, coniferous trees such as cedar, cypress, pine (such as red pine), hemlock, fir, etc., or broad-leaved trees such as oak, chestnut, Japanese oak, beech, zelkova, etc. Generally, laminated wood such as structural laminated lumber or laminated wood such as structural laminated veneer lumber (LVL) is used from the viewpoint of cost. The same type as the beam material may be used, or a different type may be used. Incidentally, forming the above-mentioned vertical section from wood does not necessarily require that the entire section be made of wood alone; for example, the vertical section can be formed by forming a vertical connection section in the connecting metal member that extends perpendicular to the length of the beam material, and connecting wood to that vertical connection section.

[0024] The connecting metal of the beam structure of claim 6 is integrally formed with a rectangular flat plate portion, a long flange portion formed at the lower end of the flat plate portion perpendicular to the surface of the flat plate portion and longer than the left-right dimension of the flat plate portion, and a vertical connecting portion extending downward from the center of the length of the flange portion in a direction perpendicular to the length direction and constituting a part of the vertical portion.

[0025] The flat plate portion is formed of a generally rectangular steel plate or the like, and usually has a plurality of through holes through which pins, screws, screws, etc. are inserted, and is inserted (inserted) into one end of each beam member in the longitudinal direction so that the front and back surface directions coincide with the front and back surface directions of the beam member, and is fixed to each beam member with pins, screws, screws, etc. Preferably, the joining strength can be increased by fixing with a pin such as a drift pin. Also, preferably, the weight and cost can be reduced by providing a through hole, for example, a generally rectangular opening at one location in the center, or a plurality of openings at two to four locations symmetrically.

[0026] In addition, the flange portion is formed from a steel plate or the like having an approximately horizontally elongated rectangular shape overall, and is connected to the lower end of the flat plate portion approximately perpendicular to the surface of the flat plate portion, i.e., approximately inverted T-shaped when viewed from the side, and is also formed longer than the left-right horizontal dimension of the flat plate portion, i.e., connected in approximately inverted T-shaped when viewed from the front.It usually has a plurality of through holes through which pins, screws, bolts, etc. are inserted, and is inserted at the lower inside side of one end of the longitudinal direction of each beam material with the front and back surface directions aligned with the top and bottom surface directions of the beam material, and is fixed to each beam material with pins, screws, bolts, etc.

[0027] Furthermore, the vertical connection portion extends downward from approximately the center of the flange portion in the longitudinal direction at a right angle to the longitudinal direction, constitutes a part of the vertical portion, and is connected to the member constituting the remainder of the vertical portion. Usually, it has a plurality of through holes through which pins, screws, screws, etc. are inserted, and is connected to the member constituting the remainder of the vertical portion by using the pins, screws, screws, etc. Effect of the Invention

[0028] According to the beam structure of the invention of claim 1, a pair of left and right beams made of wooden material, each having a length of 4 m or more and 12 m or less, are butted together at one end in the longitudinal direction and connected with a metal joint to form a long beam, and a pair of front and rear long beams are joined opposite each other in the thickness direction perpendicular to the longitudinal direction to form a long, large-section structural material, and further, a vertical section extending downward from the joint position of the pair of left and right beams in a direction perpendicular to the longitudinal direction of the beams in each of the long beams is connected to the front and rear faces at each end on both sides in the longitudinal direction of the pair of front and rear long beams by a pair of front and rear brace sections.

[0029] Therefore, a pair of wooden beams, each between 4m and 12m long, are butted together at one end in the longitudinal direction and connected with metal joints to form a long beam, and then the pair of long beams are joined facing each other in the thickness direction perpendicular to the longitudinal direction to form a long, large-section structural material.In addition to the stress borne by the metal joints, the vertical section of each long beam extending downward from the joint between the pair of beams in a direction perpendicular to the longitudinal direction of the beams and each end on both sides in the longitudinal direction of the long beams are connected by brace sections, so that the stress can also be borne by the brace sections. This provides high strength and rigidity that can reduce deflection even when beams of 4m to 12m in length are joined together in the lengthwise direction, and since long spans are formed by joining 4m to 12m beams that can be obtained at low cost and transported at low cost, it makes it possible to form long-span frames at low cost in medium to large wooden buildings.

[0030] Furthermore, two long beams, each of which is 4m or more and 12m or less in length at the small and medium sections, are joined together with metal joints to form a large cross section, so that even when it burns, damage to each beam is limited to three surfaces, excluding the joint surfaces between the front and rear pairs of long beams. Also, because heat resistance occurs between the joints of the beams facing each other in the front and rear direction, it is possible to delay the burning and prevent the loss of strength due to heat. This improves fire resistance.

[0031] According to the beam structure of the invention of claim 2, the front and rear sides and bottom of the joints between the pair of beams constituting each of the long beams in the long, large cross-section structural material are covered with wooden panels. Therefore, in addition to the effect of claim 1, the joints between the pair of beams constituting the long beams in the long, large cross-section structural material are reinforced and stiffened, and fire resistance is improved. Furthermore, because the panels are made of wood, design is also ensured.

[0032] According to the beam structure of the invention of claim 3, a pair of left and right beams made of wooden material, each of which is 4 m or more and 12 m or less in length, are butted together at one end in the longitudinal direction and connected with a metal joint to form a long beam, and further, a vertical section of the long beam extends downward from the joint position of the pair of left and right beams in a direction perpendicular to the longitudinal direction of the beams, and a pair of front, rear, left and right brace sections connect the front and rear faces at each end on both sides in the longitudinal direction of the long beam.

[0033] Therefore, a long beam is formed by butting together a pair of wooden beams, each measuring 4m or more and 12m or less in length, at one end of their length and connecting them with metal joints.In addition to the stress burden borne by the metal joints, the vertical section of the long beam extending downward from the joint between the pair of beams at a right angle to the length of the beams, and the brace sections connecting the front and rear faces at both ends of the long beam in the length direction, allow the brace sections to also bear stress. This provides high strength and rigidity that makes bending unlikely even when connecting beams that are 4m to 12m long in the lengthwise direction, and since long spans are formed by joining 4m to 12m beams that can be obtained at low cost and have low transportation costs, it makes it possible to form long-span frames at low cost in medium to large-scale wooden buildings.

[0034] According to the beam structure of the invention of claim 4, the front, rear and underside of the joint between the pair of left and right beams is covered with a wooden panel, so in addition to the effect of claim 3, the joint between the pair of beams constituting the long beam is reinforced and stiffened, and fire resistance is improved. Furthermore, because the panel is made of wood, design is also ensured.

[0035] According to the beam structure of the invention of claim 5, the vertical portion is formed of wood, and therefore in addition to the effects of claim 1 or 3, the design quality of wood can be expressed.

[0036] According to the beam structure of the invention of claim 6, the joint metal comprises a rectangular flat plate portion, a long flange portion formed at the lower end of the flat plate portion perpendicular to the surface of the flat plate portion and longer than the horizontal dimension of the flat plate portion, and a vertical connection portion extending downward from the center of the length of the flange portion in a direction perpendicular to the length direction and constituting the vertical portion, and the flange portion having upper and lower surfaces that are wider than the horizontal dimension of the flat plate portion perpendicular to the surface of the flat plate portion at the lower end of the flat plate portion and extend in the thickness direction and horizontal directions of the flat plate portion is formed, thereby increasing moment resistance against vertical loads and rotational rigidity. Therefore, in addition to the effect of claim 1 or claim 3, the strength can be improved. [Brief description of the drawings]

[0037] [Figure 1] FIG. 1 is an explanatory diagram illustrating an example in which a beam structure according to a first embodiment of the present invention is applied to a climbing beam. [Diagram 2] FIG. 2 is an overall perspective view of a metal joint that connects a pair of beam members that constitute the beam structure according to the first embodiment of the present invention. [Diagram 3] Figure 3(a) is a front view of a connecting metal fitting that connects a pair of beam materials that constitute a beam structure of embodiment 1 of the present invention, Figure 3(b) is a side view of a connecting metal fitting that connects a pair of beam materials that constitute a beam structure of embodiment 1 of the present invention, and Figure 3(c) is a bottom view of a connecting metal fitting that connects a pair of beam materials that constitute a beam structure of embodiment 1 of the present invention. [Figure 4] FIG. 4 is a perspective view illustrating a main portion of a beam material constituting the beam structure according to the first embodiment of the present invention. [Diagram 5] FIG. 5 is an explanatory perspective view seen from below, illustrating a configuration for connecting a pair of beam members that constitute the beam structure according to the first embodiment of the present invention. [Figure 6] FIG. 6 is an explanatory perspective view seen from above illustrating a state in which a metal joint is inserted into a pair of beam materials that constitute a beam structure according to embodiment 1 of the present invention, thereby connecting the pair of beam materials to each other. [Figure 7]Figure 7(a) is an explanatory diagram viewed from the front, illustrating the state in which a pair of beam materials that constitute the beam structure of embodiment 1 of the present invention are connected together with joint metal fittings; Figure 7(b) is an explanatory diagram viewed from above, illustrating the state in which a pair of beam materials that constitute the beam structure of embodiment 1 of the present invention are connected together with joint metal fittings; and Figure 7(c) is an explanatory diagram viewed from below, illustrating the state in which a pair of beam materials that constitute the beam structure of embodiment 1 of the present invention are connected together with joint metal fittings. [Figure 8] FIG. 8 is an explanatory perspective view seen from below of a long, large cross-section structural member formed by joining a pair of long beams that constitute the beam structure according to the first embodiment of the present invention. [Figure 9] Figure 9 is an explanatory oblique view seen from above illustrating the state in which wood panels are arranged around the connection parts of each long beam material in a long, large cross-section structural material formed by joining a pair of long beam materials that constitute a beam structure in embodiment 1 of the present invention. [Figure 10] Figure 10 is an explanatory oblique view seen from below illustrating the state in which a wood panel is attached around the connection parts of each long beam material in a long, large cross-section structural material formed by joining a pair of long beam materials that constitute a beam structure in embodiment 1 of the present invention. [Figure 11] Figure 11 is an explanatory oblique view seen from above of a long, large cross-section structural member that constitutes a beam structure in accordance with embodiment 1 of the present invention, with a wooden panel attached around the connection between a pair of left and right beam members of each long beam member. [Figure 12] FIG. 12 is an explanatory perspective view illustrating a configuration of a vertical portion that constitutes the beam structure according to the first embodiment of the present invention. [Figure 13] Figure 13(a) is a front view illustrating a beam structure according to embodiment 1 of the present invention, Figure 13(b) is a plan view of the beam structure according to embodiment 1 of the present invention seen from above, and Figure 13(c) is a bottom view of the beam structure according to embodiment 1 of the present invention seen from below. [Figure 14]Figure 14(a) is a partially enlarged view from the front of the connection portion, vertical portion, and brace portion between a pair of beam members in a beam structure according to embodiment 1 of the present invention, Figure 14(b) is a cross-sectional view along AA in Figure 14(a), and Figure 14(c) is a partially enlarged view from below of the connection portion, vertical portion, and brace portion between a pair of beam members in a beam structure according to embodiment 1 of the present invention. [Figure 15] Figure 15(a) is a partial enlarged view of one end of the beam in the longitudinal direction and the brace portion of the beam structure of embodiment 1 of the present invention, viewed from the front side, Figure 15(b) is a B-B cross-sectional view of Figure 15(a), and Figure 15(c) is a partial enlarged view of one end of the beam in the longitudinal direction and the brace portion of the beam structure of embodiment 1 of the present invention, viewed from above (or below). [Figure 16] FIG. 16 is an explanatory perspective view illustrating a connection configuration between the vertical portion and the brace portion of the beam structure according to the first embodiment of the present invention. [Figure 17] FIG. 17 is an explanatory perspective view illustrating a connection configuration between one end in the longitudinal direction of the beam material of the beam structure according to the first embodiment of the present invention and the brace portion. [Figure 18] FIG. 18 is a schematic diagram for explaining an experimental method for evaluating the strength and rigidity of a test specimen of the beam structure according to the first embodiment of the present invention under a downward load. [Figure 19] Figure 19 is a front view illustrating a beam structure according to embodiment 2 of the present invention, Figure 19(b) is a plan view of the beam structure according to embodiment 2 of the present invention seen from above, and Figure 19(c) is a bottom view of the beam structure according to embodiment 2 of the present invention seen from below. [Figure 20] FIG. 20 is a partial explanatory diagram of a climbing beam using the beam structure according to the first embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0038] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In each embodiment, the same symbols and the same reference characters refer to the same or corresponding functional parts, and the same symbols and the same reference characters between the respective embodiments refer to functional parts common to those embodiments, so duplicated detailed explanations will be omitted here.

[0039] [Embodiment 1] As shown in Figs. 1 and 13, the beam structure 1 of the first embodiment of the present invention is formed by joining two beams 10 made of standardized lumber or commonly available lumber in a pair along their length with joint metal fittings (joint metal fittings) 20 to form a long beam 100, and further joining two long beams 100 in a pair (a total of four beams 10) in a thickness direction perpendicular to the length of the beams 10 with long screws 38 or the like to form a long, large cross-section structural member 200, and connecting a vertical section 300 extending downward from the joint metal fittings 20 that connect a pair (a pair of beams 10) of beams 10 to the other end of each beam 10 on the opposite side to the connecting side in the length direction with a brace section 400. By using this beam structure 1 to span a large span, a frame F of a medium to large wooden building is formed. In other words, the beam structure 1 according to the present embodiment 1 is used as a climbing beam or ridgepole in wooden buildings that constitute medium- to large-scale buildings such as factories, gymnasiums, and public facilities, and constitutes a long-span frame F.

[0040] First, the metal joints 20 that connect the beams 10 made of standardized lumber or commonly available materials will be described with reference to Figs. 2 and 3. The joint metal 20 of the present embodiment 1 is composed of a substantially rectangular flat plate portion 21 made of a metal plate such as a steel plate having a thickness of, for example, 6 to 12 mm, preferably 8 to 10 mm, a substantially rectangular and elongated flange portion 22 made of a metal plate such as a steel plate having a thickness of, for example, 5 to 12 mm, preferably 5 to 11 mm, which is integrally formed at one end portion, which is the long side side, of the flat plate portion 21 substantially perpendicular to the surface of the flat plate portion 21, and a substantially rectangular vertical connection portion 23 made of a metal plate such as a steel plate having a thickness of, for example, 6 to 12 mm, preferably 8 to 10 mm, which extends downward from the approximate center in the length direction of the flange portion 22. The flat plate portion 21 and the flange portion 22 are formed into a substantially inverted T shape in side view and front view by the flange portion 22 provided substantially perpendicular to the surface of the flat plate portion 21.

[0041] The flat plate portion 21 of the metal joint 20 of the present embodiment 1 is lightened by forming a substantially rectangular opening 25 in the substantially central portion thereof. The area of ​​the opening 25 is, for example, about 0.25 to 0.45 times the area of ​​the flat plate portion 21. Furthermore, in the flat plate portion 21, a square portion surrounding the opening 25 has circular pin holes 24 through which pins 34 such as drift pins for fixing to the beam material 10 are inserted. These pin holes 24 are through holes and are formed in a plurality of predetermined positions. Furthermore, the flange portion 22 of the joint metal member 20 also has circular screw holes 26 through which screws 36 are inserted for fixing to the beam material 10. These screw holes 26 are also through holes and are formed in multiple places at predetermined positions.

[0042] The positions and numbers of the pin holes 24 and screw holes 26 are not particularly limited, and are designed appropriately depending on the type, material, strength, length, and intended use of the long, large cross-section structural member 200, etc. The number of pin holes 24 is, for example, about 18 to 34, and preferably about 20 to 30, and the number of screw holes 26 is, for example, about 8 to 38, and preferably about 10 to 36. Since the insertion direction of the screw 36 inserted into the screw hole 26 of the flange portion 22 of the joint metal 20 is approximately perpendicular to the insertion direction of the pin 34 inserted into the pin hole 24 of the flat plate portion 21 of the joint metal 20, the position of the screw hole 26 of the flange portion 22 is provided at a position where the pin 34 inserted into the pin hole 24 of the flat plate portion 21 and the screw 36 inserted into the screw hole 26 do not come into contact with each other, that is, where they do not interfere with each other.

[0043] The pinhole 24 penetrating the thickness of the flat plate portion 21 is formed to be larger than the diameter of the pin 34, for example, by about 0.8 to 2 mm, and preferably by about 0.8 to 1 mm, to facilitate the passage of the pin 34. For example, a pin 34 having a diameter of about φ10 to 14 mm is used, and the pinhole 24 corresponding to the pin 34 has a diameter of about φ11 to 16 mm, for example. Similarly, the screw holes 26 penetrating the thickness of the flange portion 22 are formed to be larger than the diameter of the screws 36, for example, by about 0.8 to 2 mm, and preferably by about 0.8 to 1 mm, to make it easier to pass the screws 36 through. For example, screws 36 with a diameter of about φ4 to 8 mm are used, and the screw holes 26 corresponding to the screws 36 have a diameter of about φ5 to 10 mm. The screws 36 have a smaller diameter than the pins 34. Fixing with such pins 34 and screws 36 involves hammering or driving them in, which allows for less wobbling and more rigid fixation compared to fixation with bolts.

[0044] According to the joint structure in which a pair of beams 10 are butted together in the length direction using the joint metal 20 of the present embodiment 1, the lower side of the connection part of the pair of beams 10 becomes the tensile side where the load due to the load is large due to the vertical load, while the inside of the wood is less stressed. Therefore, in the present embodiment 1, the joint metal 20 is fixed to the beam 10 with the flange part 22 side facing down, and the number of pin holes 24 through which the pins 34 are inserted is greater on the lower side of the flat plate part 21 than on the upper side, so that there are more fixing points with the wood. Also, the central part of the flat plate part 21, which corresponds to the inside of the wood where the stress burden is small, is made lighter by providing the opening 25 as described above. Furthermore, the opening 25 is provided in the flat plate part 21 so that the center position of the opening 25 is located slightly above the center position of the entire flat plate part 21, and the lower vertical width of the opening 25 is formed wider than the upper vertical width, so that the area of ​​the lower side is larger. In this way, the structure is lightweight and can withstand the load applied to the lower side of the connecting portion of the pair of beams 10.

[0045] The tongue-shaped vertical connection part 23 extending downward from approximately the center in the longitudinal direction of the flange part 22 is a part to which the vertical wood part 73 made of laminated wood, which will be described later, is attached to form the vertical part 300, and is made of a metal plate such as a steel plate having approximately the same thickness as the flat part 21. At the lower side of the vertical connection part 23, there are formed two pin holes 29, for example on the left and right, into which pins 99 for attaching the vertical wood part 73 made of laminated wood are inserted. The pin holes 29 penetrating the thickness of the vertical connecting parts 23 are formed to be larger than the diameter of the pins 99, for example, by about 0.8 to 2 mm, and preferably by about 0.8 to 1 mm, to make it easier to pass the pins 99 through. For example, pins 99 with a diameter of about φ10 to 14 mm are used, and the pin holes 29 corresponding to the pins 99 have a diameter of about φ11 to 16 mm. As described above, fixing with such pins 99 is performed by hammering or driving them in, which allows for less wobbling and higher rigidity than fixing with bolts.

[0046] The joint metal 20, which is composed of the long flange portion 22, the rectangular flat plate portion 21 substantially perpendicular to the flange portion 22, and the vertical connection portion 23 extending downward from the center of the flange portion 22 in the longitudinal direction substantially perpendicular to the surface of the flange portion 22, is made of a steel plate and has a weight within a range of, for example, 5 to 50 kg, and preferably 10 to 20 kg. However, when implementing the present invention, the material of the joint metal 20 is not limited to steel, and another metal, for example, tungsten tile cast iron, may be used.

[0047] In the first embodiment, the short side of the cross-sectional dimension is 7.5 cm or more, and the long side is 15 cm or more. 2 The flat plate portion 21 of the metal joint 20, which joins together beams 10 made of small to medium cross-section wood other than those mentioned above and each beam is 4 to 12 m long, has a horizontal dimension within a range of, for example, 500 to 1500 mm, preferably 550 to 1200 mm, and a vertical dimension (height dimension) within a range of, for example, 360 to 450 mm, preferably 380 to 420 mm. The dimension of the opening 25 of the flat plate portion 21 is, for example, within a range of, for example, 420 to 800 mm, preferably 460 to 700 mm, and is, for example, about 30% to 65%, preferably about 50 to 60%, of the horizontal dimension of the metal joint 20, and has a vertical dimension within a range of, for example, 180 to 230 mm, preferably 200 to 220 mm.

[0048] The flange portion 22 of the joint metal 20 has a length (horizontal dimension) longer than the horizontal dimension of the flat plate portion 21, for example, within the range of 550 to 1600 mm, preferably within the range of 600 to 140 mm, a width dimension within the range of, for example, 35 to 50 mm, preferably within the range of 38 to 45 mm, and a width larger than the thickness of the flat plate 21, for example, within the range of 30 to 45 mm, preferably within the range of 30 to 40 mm, and has a width of, for example, 1 / 2 to 1 / 3, preferably about 1 / 3, of the thickness of the beam material 10. If it is within the above range, a desired rigidity can be obtained. By making the length of the flange portion 22 larger than the horizontal dimension of the flat plate portion 21, for example, within the range of 1.1 to 1.3 times, even when a vertical load is applied to the joint of the long beam material 100, the rotation resistance and rotation moment are high, and the support force and resistance against the vertical load can be increased.

[0049] Furthermore, the vertical connection portion 23 of the joint metal member 20 has a horizontal dimension in the range of, for example, 95 to 180 mm, preferably in the range of 105 to 170 mm, and is, for example, 0.13 to 0.30 times, preferably about 0.15 to 0.20 times, the horizontal dimension of the flat plate portion 21. Moreover, the extension length (vertical dimension) thereof extending downward from the flange portion 22 is, for example, in the range of 90 to 140 mm, preferably in the range of 100 to 130 mm, and is, for example, 0.05 to 0.15 times, preferably about 0.06 to 0.10 times, the vertical dimension (up-down length) of the flat plate portion 21.

[0050] In addition, in this embodiment 1, the connecting hardware 20 is prepared by preparing steel plates that constitute the vertical connection portion 23 and the flat portion 21, and a long, approximately L-shaped steel plate that constitutes the flange portion 22 separately from them, and fitting (inserting) the steel plates that constitute the flat portion 21 and the vertical connection portion 23 through the steel plate of the vertical connection portion 23 formed integrally with the flat portion 21 into an opening of approximately the same dimensions as the thickness of the flat portion 21 and the vertical connection portion 23 formed in the center of the steel plate that constitutes the flange portion 22, and then filling the opening of the steel plate that constitutes the flange portion 22 with the steel plate that constitutes the flat portion 21 and the vertical connection portion 23, and joining the two by fillet welding, thereby providing the flat portion 21 approximately perpendicularly on the upper side of the surface of the flange portion 22 and providing the vertical connection portion 23 approximately perpendicularly on the lower side, thereby forming the flat portion 21, the flange portion 22, and the vertical connection portion 23 as a single unit.

[0051] However, when carrying out the present invention, the flat plate portion 21, the flange portion 22, and the vertical connection portion 23 may be formed separately and joined together by welding or the like to form an integral body. For example, without forming an opening in the steel plate constituting the flange portion 22, the lower surface of the steel plate constituting the flat plate portion 21 may be opposed to the upper surface of the steel plate constituting the flange portion 22 and joined by welding, and the upper surface of the steel plate constituting the vertical connection portion 23 may be opposed to the lower surface of the steel plate constituting the flange portion 22 and joined by welding. That is, the steel plate constituting the flat plate portion 21 and the steel plate constituting the vertical connection portion 23 may be butted against the steel plate constituting the flange portion 22 in a substantially inverted T-shape in side and front views and welded to the steel plate constituting the flange portion 22. There is no particular restriction on the method of welding the two, and they can be connected by intermittent fillet welding, circumferential welding, butt welding (groove welding), or the like.

[0052] Furthermore, when implementing the present invention, the flat plate portion 21, the flange portion 22, and the vertical connection portion 23 of the joint metal member 20 may be connected together by means of screws or the like, not limited to welding, or may be molded as a whole. In the above description, the connection configuration is such that the substantially rectangular steel plate constituting the flat plate portion 21 and the long steel plate constituting the flange portion 22 and the substantially rectangular steel plate constituting the vertical connection portion 23 form a substantially inverted T shape in side view, but when implementing the present invention, the connection configuration may be such that L-shaped steel plates are joined together to form a substantially inverted T shape in side view.

[0053] In the first embodiment, the joint metal 20 is made up of the flat plate portion 21, the flange portion 22 formed at a right angle to the lower end of the flat plate portion 21, and the vertical connection portion 23 extending downward from the center of the length of the flange portion 22 and formed at a right angle to the flange portion 22. The joint metal 20 is made up of the flat plate portion 21, the flange portion 22, and the vertical connection portion 23 ... 2 The beams 10 are made of small to medium cross-section wood other than those mentioned above, preferably generally available laminated timber with a beam depth of 450 mm or more.

[0054] Next, the beams 10 connected using this metal joint 20 will be described with reference to FIG. The beam material 10 in this embodiment 1 is a flat square timber with a rectangular cross section made of laminated timber, and standardized timber is used, for example, a small or medium cross section timber with a short side of 105 mm or 120 mm and a long side of 150 mm, 180 mm, 210 mm, 240 mm, 270 mm, 300 mm, 330 mm, 360 mm, 390 mm, or 450 mm, and a length of 4 m, 5 m, 6 m, 7 m, 8 m, 9 m, 10 m, 11 m, or 12 m. In addition, laminated timber is made by cutting planks (lamina) from raw logs with a band saw or the like, joining them vertically or widthwise, and laminating them. There is no particular restriction on the species or type of wood used for the laminated timber. For example, cedar or cypress wood can be used. It can be laminated timber of different grades or laminated timber of the same grade. There is no particular restriction on the composition, such as symmetrical composition, specific symmetrical composition, or asymmetrical composition. Usually, structural laminated timber is used. However, when implementing the present invention, it is also possible to use solid wood.

[0055] As shown in FIG. 4, a beam 10 made of laminated timber of a predetermined dimension that is to be joined using a metal joint 20 has an insertion groove 41 formed therein into which the metal joint 20 is inserted. The insertion groove 41 is cut into one longitudinal end of each beam material 10 connected by the connecting metal fitting 20, and is formed continuously as an opening that penetrates the upper and lower surfaces (beam formation direction) with a vertical cross section that is approximately the same shape as the external shape of the flat plate portion 21 and flange portion 22 of the connecting metal fitting 20, which are approximately T-shaped in side view, and a slit groove 41a into which the flat plate portion 21 of the connecting metal fitting 20 is inserted and a flange receiving recess 41b provided below the slit groove 41a into which the flange portion 22 of the connecting metal fitting 20 is inserted.

[0056] The slit groove 41a into which the flat plate portion 21 of the joint metal 20 is inserted is formed in each beam 10, with a slit length (groove depth) corresponding to approximately half the horizontal dimension of the flat plate portion 21 of the joint metal 20, and a slit width corresponding to the thickness of the flat plate portion 21, and extending from the lower side to the upper end face of the beam 10. This slit groove 41a is formed in a slit shape at approximately the center position in the thickness direction perpendicular to the longitudinal direction of the beam 10 by slitting the wood at one end in the longitudinal direction of each beam 10, and divides the thickness dimension (beam width) of the beam 10 into approximately equal halves.

[0057] In addition, taking into account the expansion and contraction characteristics of wood, it is preferable that the slit length of the slit groove 41a be approximately +5 to 12 mm larger than half the horizontal dimension of the flat portion 21 of the connecting metal fitting 20, and it is also preferable that the slit width of the slit groove 41a be approximately +1 to 3 mm larger than the thickness of the flat portion 21. In addition, in this embodiment 1, the vertical dimension (height dimension) of the flat portion 21 and flange portion 22 of the connecting metal fitting 20 is smaller than the vertical dimension (beam length) of the beam material 10, but the slit groove 41a penetrates from the lower surface to the upper surface of the beam material 10, and the upper and lower surfaces of one end side of the beam material 10 in the longitudinal direction are open, and the vertical length of the slit groove 41a is larger than the vertical dimension (height dimension) of the flat portion 21 and flange portion 22 of the connecting metal fitting 20.

[0058] The flange receiving recess 41b, into which the flange portion 22 of the connecting metal fitting 20 fits, is formed with a width wider than the slit width of the slit groove 41a and corresponding to the width dimension of the flange portion 22, and also with a length corresponding to approximately half the length (horizontal dimension) of the flange portion 22, and is further formed on the lower side of one end side of each beam material 10 in the longitudinal direction with a recess depth corresponding to the thickness of the flange portion 22. With regard to the flange receiving recess 41b, taking into consideration the expansion and contraction characteristics of wood, it is preferable that the length corresponding to approximately half the length (horizontal dimension) of the flange portion 22 has a margin of about +5 to +12 mm relative to half the length (horizontal dimension) of the flange portion 22 of the connecting metal fitting 20, and it is also preferable that the width has a margin of about +3 to +10 mm relative to the width of the flange portion 22.

[0059] By forming an insertion groove 41 that has an approximately inverted T-shaped vertical cross section and penetrates in the vertical direction, consisting of the slit groove 41a and the flange receiving recess 41b provided below it, one end side of the length of each beam material 10 is formed into an approximately U-shaped cross section, so that the connecting metal fitting 20 can be inserted from the below side where the flange receiving recess 41b of the beam material 10 is formed toward the slit groove 41a.

[0060] In addition, at one end of each beam 10 in the longitudinal direction, which is formed into a substantially U-shaped cross section by the formation of the insertion groove 41, a pin hole 44 having a circular cross section is drilled at a position corresponding to the pin hole 24 of the flat plate portion 21 of the joint metal 20 inserted into the insertion groove 41, into which a pin 34 for joining and fixing the joint metal 20 and the beam 10 is inserted. This pin hole 44 is provided penetrating the thickness direction, which is perpendicular to the longitudinal direction of the beam 10. The pin hole 44 is formed with a diameter substantially the same as that of the pin hole 24 of the flat plate portion 21 of the joint metal 20. That is, the pin hole 44 is formed to be larger than the diameter of the pin 34, for example, by about 0.8 to 2 mm, preferably by about 0.8 mm to 1 mm, to make it easier to pass the pin 34 through. For example, the pin hole 44 corresponding to a pin 34 of about φ10 to 14 mm is, for example, about φ11 to 16 mm.

[0061] Next, assembly for connecting a pair of beams 10 together using metal joints 20 will be described with reference to Figures 5 to 7. Note that the beams 10 in Figures 5 to 7 are made of the same laminated wood as the beams 10 in Figure 4, but the boundaries between the laminated wood pieces have been omitted to make the illustrations easier to understand. As shown in Figures 5 to 7, the pair of beams 10 to be joined together are arranged such that their end sides having the insertion grooves 41 face each other in the length direction, the flat plate portion 21 side of the joint metal 20 is inserted from the flange receiving recess 41b side of the insertion groove 41 of each beam 10, the flat plate portion 21 of the joint metal 20 is inserted into the slit groove 41a of the insertion groove 41 of the pair of beams 10, and the flange portion 22 of the joint metal 20 is accommodated in the flange receiving recess 41b of the pair of beams 10. In other words, with the entire flat plate portion 21 of the joint metal 20 inserted into the slit groove 41a of the insertion groove 41 of the pair of beams 10, the flange portion 22 of the joint metal 20 fits into the flange receiving recess 41b of the insertion groove 41 of the pair of beams 10, and the thickness of the flange portion 22 of the joint metal 20 is accommodated within the pair of beams 10. At this time, the flat portion 21 of the connecting metal 20 is inserted into the pair of beam materials 10, and the lower surface of the flange portion 22 of the connecting metal 20 is accommodated in the flange receiving recess 41b of the pair of beam materials 10 with the lower surface of the pair of beam materials 10 being approximately flush with or slightly inward, thereby exposing the vertical connection portion 23 extending below the flange portion 22 of the connecting metal 20 on the underside of the pair of beam materials 10.

[0062] Then, with the joint metal fittings 20 inserted into the insertion grooves 41 formed at one end of each beam material 10, pins 34, such as drift pins with a diameter of 10 to 15 mm, are inserted from the pin hole 44 on one side of the side perpendicular to the top and bottom surfaces of the beam material 10, and driven toward the pin hole 24 in the flat plate portion 21 of the joint metal fittings 20 and the pin hole 44 on the other side of the side surface of the beam material 10. The driving of the pins 34 is performed at a plurality of predetermined locations corresponding to the pin holes 44 and the pin holes 24. Usually, the pins 34 are driven into all of the pin holes 44 provided in the beam material 10 and the pin holes 24 provided in the joint metal fittings 20. With the flat portion 21 and flange portion 22 of the connecting hardware 20 inserted into the insertion grooves 41 of a pair of beam materials 10 in this manner, pins 34 are pressed into the pin holes 44 of the beam material 10 and the pin holes 24 of the connecting hardware 20 at several predetermined locations and driven in the thickness direction perpendicular to the longitudinal direction of the beam material 10, and the flat portion 21 of the connecting hardware 20 is fixed to each beam material 10 by the driven pins 34.

[0063] The length of pin 34 at this time is approximately the same as the dimension in the thickness direction perpendicular to the longitudinal direction of beam 10 (the dimension of the short side of the cross section, i.e., the beam width). That is, pin 34 is pressed into pin hole 44 on one side of the side perpendicular to the top and bottom of beam 10, passes through pin hole 24 in flat plate portion 21 of joint metal fitting 20, and extends to near the open end of pin hole 44 on the opposite side of beam 10. The tip of pin 34 may be long enough to extend slightly inward from the open end, as long as it is long enough not to extend beyond the open end of pin hole 44 on the side of beam 10 opposite the insertion side of pin 34.

[0064] In particular, if the pins 34 that fix the flat plate portion 21 of the joint metal 20 and each beam 10 are drift pins, they are driven in and pressed in, making it possible to achieve a joint with little rattle and high rigidity. In addition, it prevents loosening of the joint due to aging or wood shrinkage, and is less likely to rattle or reduce strength, i.e., has good durability. Furthermore, it enables installation without protruding the ends of the pins 34 from the beam 10, or exposing them to the outside, so that the design surface of the beam 10 can be improved. In addition, as described below, even if a reinforcing wooden panel 50 (50A, 50B, 50C) is covered at the joint between a pair of beams 10, it does not interfere with the tightening and joining of the wooden panel 50. Preferably, the outer peripheral surface of the pins 34 is knurled (mesh) or slit processed to form unevenness, making it more difficult to come out. However, when implementing the present invention, bolts and nuts, lag screw bolts (LSB), etc. may be used. When using bolts and nuts, it is preferable that the bolts and nuts are housed inside the beam 10 and are not exposed to the outside.

[0065] Also, on the flange portion 22 side of the connecting metal 20 inserted into the insertion groove 41 of the pair of beam materials 10, i.e., on the bottom (lower) side of the pair of beam materials 10, half-threaded screws 36 are inserted from the screw holes 26 on the lower side of the flange portion 22 and driven toward the upper side (the bottom side of the concave flange receiving recess 41b of the beam material 10). In this way, screws 36 of, for example, φ4 to 8 mm are pressed into the beam material 10 at a plurality of predetermined locations on the flange portion 22 side of the connecting metal 20, and the flange portion 22 of the connecting metal 20 and each beam material 10 are fixed by the screws 36 driven in the beam formation direction of the beam material 10. Usually, the screws 36 are driven into all of the pin holes 26 provided in the connecting metal 20. The screws 36 only need to be able to fix the flange portion 22 to the beam material 10 with a predetermined tightening force, and may have a length of, for example, 30 to 60 mm, and be press-fitted at a position where they do not interfere with the pins 34. When implementing the present invention, the screws 36 are not limited to having a diameter of 8 mm or less, and screws having a diameter of more than 8 mm may be used.

[0066] In this way, the flat portion 21 and flange portion 22 of the connecting hardware 20 are inserted into the insertion grooves 41 of a pair of beam materials 10, with their end sides having the insertion grooves 41 facing each other, and the connecting hardware 20 and the pair of beam materials 10 are fixed together with pins 34 such as drift pins and screws 36, so that the pair of beam materials 10 are butted together with their end faces in the longitudinal direction and connected via the connecting hardware 20, and are firmly integrated to form a single long beam material 100.

[0067] This long beam 100 is made of joint metal 20 consisting of a rectangular flat plate portion 21 having pin holes 24 penetrating the front and back surfaces, a long flange portion 22 at the lower end of the flat plate portion 21 that is approximately perpendicular to the surface of the flat plate portion 21 and is longer than the horizontal dimension of the flat plate portion 21 and has screw holes 26 penetrating the top and bottom surfaces, and a vertical connection portion 23 extending downward from the center of the length of the flange portion 22, and is made of wood of approximately the same length of 4 m or more and 12 m or less, and has insertion grooves 41 into which the joint metal 20 is inserted at one end of the length direction of the opposing wood pieces, and also has a pair of wood pieces corresponding to the pin holes 24 of the joint metal 20. The joining hardware 20 is provided with a pair of beams 10 having wooden holes 44 formed therethrough in a direction perpendicular to the longitudinal direction of the beams 10, a pin 34 that is inserted into the pin hole 24 of the joining hardware 20 and the wooden holes 44 of the pair of beams 10 to join and fix the flat portion 21 of the joining hardware 20 to the pair of beams 10, and a screw 36 that is inserted into the screw hole 26 of the joining hardware 20 to join and fix the flange portion 22 of the joining hardware 20 to the pair of beams 10. The joining hardware 20 is inserted into the insertion groove 41 of the pair of beams 10 and fixed to the pair of beams 10 with the pin 34 and the screw 36, thereby joining the pair of beams 10 together.

[0068] That is, the long beam 100 of the first embodiment is a pair of left and right beams 10 each made of wood with a length of 4 m or more and 12 m or less, and is inserted into an insertion groove 41 provided at one end of the longitudinal direction of the opposing wooden pieces of the pair of left and right beams 10. The insertion groove 41 includes a rectangular flat plate portion 21, a long flange portion 22 formed integrally with the lower end of the flat plate portion 21 at a right angle to the flat plate portion 21 and longer than the horizontal dimension of the flat plate portion 21, and a vertical connection portion 23 extending downward from the center of the flange portion 22 in the longitudinal direction. The connecting metal fitting 20 is inserted, and pins 34 are inserted into pin holes 24 provided in the flat portion 21 of the connecting metal fitting 20 and into wood holes 44 provided in the pair of beam materials 10 to join and fix the flat portion 21 of the connecting metal fitting 20 and the pair of beam materials 10, and screws 36 are inserted into screw holes 26 provided in the flange portions 22 of the connecting metal fitting 20 to join and fix the flange portions 22 of the connecting metal fitting 20 and the pair of beam materials 10, thereby vertically joining the pair of beam materials 10 together.

[0069] The long beam 100 of the first embodiment thus formed is such that the joint metal 20 is inserted into one end of each beam 10 in the longitudinal direction, and the beam 10 and the joint metal 20 are fixed to each other with the pin 34 and the screw 36, so that one end face of each beam 10 in the longitudinal direction is butted against each other to connect and fix a pair of beams 10 to each other, and the flat plate portion 21 of the joint metal 20 is inserted into the pair of beams 10 toward the center in the thickness direction perpendicular to the longitudinal direction, and the flange portion 22 perpendicular to the surface of the flat plate portion 21 is accommodated in the flange receiving recess 41b formed at the lower part of one end of each beam 10 in the longitudinal direction. The vertical connection portion 23 extending downward from approximately the center of the longitudinal direction of the flange portion 22 of the joint metal 20 is exposed by extending from the lower side of the beam 10 in the direction perpendicular to the longitudinal direction of the beam 10 at the joint between the pair of beams 10. At this time, the center position of the horizontal length of the flat plate portion 21 is arranged to approximately coincide with the boundary position of the joint of a pair of beams 10, i.e., half of the horizontal length of the joint metal 20 is accommodated in each beam 10, and is balanced on the left and right. This distributes the load in a balanced manner among the beams 10, and the joint metal 20 strengthens the horizontal framework of the beams 10.

[0070] Thus, according to the long beam 100 of the present embodiment 1, in which the joint metal 20 is inserted into the beam 10 at one end in the longitudinal direction of each beam 10 having a length of 4 to 12 m, and the two are fixed with the pin 34 and the screw 36 to butt one end face of the pair of beams 10 in the longitudinal direction and join them together, the joint metal 20 joining the pair of left and right beams 10 has a flat plate portion 21 and a flange portion 22 arranged at a right angle thereto. Therefore, since the flange portion 22 having a surface that extends in the longitudinal direction of the beam 10 and is perpendicular to the longitudinal section of the beam 10 is arranged on the lower side of the pair of beams 10, that is, on the tensile side when a vertical load such as a live load is received, a high support force and strength against the vertical load can be obtained. In addition, since the pair of left and right beams 10 and the joint metal 20 are pin-jointed, the joint position does not change even due to repeated vibration or wood shrinkage, and loosening is unlikely to occur, so that the joint is unlikely to reduce strength.

[0071] In the long beam 100 of the present embodiment 1, the vertical dimension (height dimension) of the joint metal 20 in the up-down direction is shorter than the beam length of the beam 10, and the upper end of the flat plate portion 21 opposite to the flange portion 22 side of the joint metal 20 when inserted into the beam 10 is located inside the opening end of the slit groove 41a of the insertion groove 41 of the pair of left and right beams 10. Therefore, in the long beam 100 of the present embodiment 1, a long filler 61 (for example, a width (vertical dimension) of 5 to 20 mm, preferably 8 to 15 mm) with approximately the same horizontal dimension and thickness as the flat plate portion 21 of the joint metal 20 and a predetermined width (vertical dimension) is inserted into the gap of the slit groove 41a above the flat plate portion 21 of the inserted joint metal 20, and one filler 61 is fixed to the pair of connected beams 10 with an adhesive or the like to close the gap of the slit groove 41a. In this way, by blocking the upper opening of the insertion groove 41 of a pair of beams 10 connected by the joint metal 20 with the filler wood 61, a burn area is formed, improving fire resistance. Also, the filler wood 61 blocks airflow at the upper end of the joint metal 20, preventing condensation in the insertion groove 41. When implementing the present invention, a flame-retardant material may be used instead of the filler wood 61 to improve fire resistance.

[0072] In this embodiment 1, a pair of long beams 100, each made up of a left and right pair of beams 10 joined together in their longitudinal direction by connecting metal fittings 20, are joined together on one side (side surface) in the thickness direction perpendicular to the longitudinal direction to form a long, large-section structural member 200 that spans between the columns.

[0073] A long, large cross-section structural material 200 formed by joining a pair of long beams 100 in parallel with each other will be described with reference to Figures 8 to 10. The long, large cross-section structural material 200 of this embodiment 1 is formed by joining a pair of left and right beams 10 together in their longitudinal direction with joining metal fittings 20, with the two long beams 100 parallel to each other in the longitudinal direction, i.e., with one side of the thickness direction side perpendicular to the longitudinal direction of the beams 10 facing each other and adjacent to each other, with the positions of the boundaries between the left and right beams 10 aligned with each other between the front and rear pairs of long beams 100, and the pair of long beams 100 joined and fixed to each other by, for example, driving long screws 38 having a length of 70 to 100 mm in a direction perpendicular to the longitudinal direction of the long beams 100. The long screws 38 for joining and fixing a pair of front and rear long beam materials 100 together are driven in at multiple locations along the length of the long beam material 100, but the spacing, positions, driving direction, etc. are not particularly limited. For example, in the figure, the long screws 38 are driven in at alternating positions on the upper and lower sides of the long beam material 100 to join and fix the pair of long beam materials 100 together.

[0074] In the figure, the long screws 38 that join the front and rear beams 10 of a pair of long beams 100 that are joined together by embracing each other are pressed into the front and rear beams 10 in a direction perpendicular to their length, and have a length that is, for example, about 0.5 to 0.8 times twice the thickness of the beams 10, and are pressed into from the side (design surface) of one of the front and rear long beams 100 toward the other front and rear long beam 100, penetrating the thickness of the beam 10 of one long beam 100, with the tip reaching the beam 10 of the other long beam 100, but not penetrating the thickness of the beam 10 of the other long beam 100.

[0075] Thus, the long and large cross-section structural member 200 of the first embodiment comprises joint metal members 20 each consisting of a rectangular flat plate portion 21 having pin holes 24 penetrating the front and back surfaces, a long flange portion 22 having screw holes 26 at the lower end of the flat plate portion 21 that are approximately perpendicular to the surface of the flat plate portion 21 and are longer than the horizontal dimension of the flat plate portion 21 and penetrate the top and bottom surfaces, and a vertical connection portion 23 extending downward from the center of the length of the flange portion 22, and each of the joint metal members 20 is made of wood having a length of 4 m or more and 12 m or less, and each of the joint metal members 20 has an insertion groove 41 into which the joint metal members 20 are inserted at one end of the length of the wood facing each other, and also has a screw hole 26 corresponding to the pin hole 24 of the joint metal member 20 and penetrating both side surfaces in the direction perpendicular to the length of the wood. The joint hardware 20 is inserted into the insertion grooves 41 of the pair of beams 10 and fixed to the pair of beams 10 with the pins 34 and the screws 36. The joint hardware 20 is inserted into the insertion grooves 41 of the pair of beams 10 and fixed to the pair of beams 10 with the pins 34 and the screws 36, thereby joining the pair of left and right beams 10 together to form a set of two long beams 100. The long beams 100 are joined together with their lengths parallel to each other, facing each other, and joined with long screws 38.

[0076] That is, in the long large cross-section structural member 200 of the first embodiment, a pair of beams 10 each made of wood having a length of 4 m or more and 12 m or less are provided with an insertion groove 41 provided at one end in the longitudinal direction of the opposing wooden pieces of the pair of beams 10. The beams 10 are made of wood and each has a length of 4 m or more and 12 m or less. The joint metal 20 is made of a rectangular flat plate portion 21, a long flange portion 22 formed at the lower end of the flat plate portion 21 at a right angle to the flat plate portion 21 and longer than the horizontal dimension of the flat plate portion 21, and a vertical connection portion 23 extending downward from the center of the flange portion 22 in the longitudinal direction. The joint metal 20 is inserted into the pin hole 24 provided in the flat plate portion 21 of the joint metal 20. Pins 34 are inserted into wood holes 44 provided in the pair of beams 10 to fix the flat portion 21 of the connecting hardware 20 and the pair of beams 10 to each other, and screws 36 are inserted into screw holes 26 provided in the flange portion 22 of the connecting hardware 20 to fix the flange portion 22 of the connecting hardware 20 and the pair of beams 10 to each other, thereby forming a set of two long beams 100 formed by vertically joining the pair of left and right beams 10 together, and these are joined together by facing each other on the front and back surfaces in the thickness direction perpendicular to the longitudinal direction and joined with long screws 38.

[0077] Furthermore, in the long-length, large-section structural material 200 of this embodiment 1, as shown in Figures 9 to 11, the connecting portion 51 where a pair of beam materials 10 are connected and joined together by a joint metal fitting 20 is covered with wood panels 50A, 50B, and 50C. The wood panels 50A, 50B, 50C in this embodiment 1 are approximately rectangular flat panels made of Cross Laminated Timber (CLT) formed by stacking and gluing planks perpendicular to each other, and in the long, large cross-section structural material 200, a pair of beams 10 are connected and joined by connecting metal fittings 20 at connecting parts 51, which cover the underside (bottom surface) of each long beam 100 and three surfaces on both side surfaces of the pair of front and rear long beams 100, and are fixed to the beams 10 by screws 55. Cross Laminated Timber (CLT) is a wood material with a laminated structure of three or more layers, in which planks (laminae) are arranged and glued in the width direction with the grain direction roughly parallel to each other, and then further laminated and glued with the grain direction roughly perpendicular to each other. Normally, a three-layer, three-ply or three-layer, four-ply structure is used to achieve both light weight and reinforcement and stiffening, but more layers are also acceptable. If the wood panel is made of cross laminated timber (CLT), it is both light weight and strong, and it is stable and less likely to bend even over long spans.

[0078] In the present embodiment 1, at the connection portion 51 where each pair of beams 10 are connected and joined by the joint metal 20, a pair of side covering wood panels 50A, 50B covering both side surfaces in the thickness direction perpendicular to the length direction of the long large cross section structural material 200, and a bottom covering wood panel 50C covering the bottom surface (bottom surface) of the long large cross section structural material 200, i.e., covering the bottom surfaces of the flange portion 22 side of the joint metal 20 in the pair of front and rear long beams 100, are respectively joined and fixed to each beam 10 using a plurality of long screws 55 (e.g., 70 to 100 mm long). In other words, the bottom surface of the connection portion 51 where the pair of left and right beams 10 are joined by the joint metal 20 in the long large cross section structural material 200 and the three sides perpendicular thereto are covered by the wood panels 50A, 50B, 50C.

[0079] The pair of front and rear side covering wood panels 50A, 50B which cover both side surfaces in the thickness direction perpendicular to the longitudinal direction of the long, large cross-section structural material 200 are joined and fixed to the beam 10, for example, by screws 55 driven along their periphery at a position where they do not interfere with the pins 36. Furthermore, the underside covering wood panel 50C which is positioned approximately perpendicular to the faces of the pair of front and rear side covering wood panels 50A, 50B and covers the underside (bottom) of the long, large cross-section structural material 200, is joined and fixed to the beam 10 by screws 55 driven at predetermined intervals along the longitudinal direction of the beam 10 at a position where it does not interfere with the connecting metal fittings 20. The number of screws 55 to be driven into the side covering wood panels 50A, 50B, which have a larger area, is greater than that of the bottom covering wood panel 50, which has a smaller area. Marks 55a are provided on the wood panel 50 in advance to indicate the positions where the screws 55 are to be driven.

[0080] Here, at the connection portion 51 between a pair of left and right beams 10 that constitute each long beam 100 of the long-length, large cross-section structural material 200, the pair of front and rear side covering wood panels 50A, 50B that cover both side surfaces in the thickness direction perpendicular to the longitudinal direction of the beam 10 have an overall shape that is approximately rectangular, and the underside covering wood panel 50C that covers the underside also has an overall shape that is approximately rectangular, but the underside covering wood panel 50C has a rectangular hole 53 formed therethrough to pass through the vertical connection portion 23 that extends downward at the joint position of the pair of left and right beams 10 of each long beam 100 that constitutes the long-length, large cross-section structural material 200. That is, in the underside covering wood panel 50C, two holes 53 are formed at predetermined positions corresponding to the vertical connection parts 23: a rectangular hole 53 for passing the vertical connection part 23 of the connecting metal fitting 20 inserted into one of the pair of long beam materials 100 at the front and rear of the long large cross-section structural material 200, and a rectangular hole 53 for passing the vertical connection part 23 of the connecting metal fitting 20 inserted into the other one. As a result, the underside-covering wood panel 50C is fixed to the underside of the connecting portion 51 of the long, large-section structural material 200 with long screws 55, with the vertical connecting portions 23 extending downward from the joint positions of the pair of left and right beams 10 passing through each of its holes 53, thereby covering the underside.

[0081] The wooden panels 50A, 50B, and 50C in this embodiment 1 are made of, for example, three-layer, three-ply cross-laminated boards, and because a 45-minute quasi-fireproof structure requires a burning margin of 35 mm, the thickness of the panels used is 35 mm or more. The thickness is preferably within a range of 35 to 40 mm, and the wooden panels 50A, 50B, and 50C are usually of the same thickness.

[0082] In each side covering panel 50A, 50B in this embodiment 1, the horizontal dimension corresponding to the length direction of the beam material 10 is approximately 1.05 to 1.2 times longer than the horizontal dimension (length) of the flange portion 22 of the connecting metal fitting 20, for example, approximately 900 to 2000 mm, and the vertical dimensions (width) from the top to the bottom are dimensions corresponding to the beam configuration of the beam material 10. In addition, in the lower covering panel 50C of this embodiment 1, the horizontal dimension corresponding to the longitudinal direction of the beam material 10 is approximately the same as the horizontal dimension of the side covering panels 50A, 50B, and the dimension (width) corresponding to the width direction perpendicular to the longitudinal direction of the beam material 10 corresponds to the sum of the total dimension of the beam widths (thickness) of two adjacent beam materials 10 of two pairs of front and rear long beam materials 100 joined with long screws 38 and the thickness of the pair of front and rear side covering panels 50A and 50B, for example, approximately 300 to 400 mm.

[0083] In this manner, in the first embodiment, in the long-length large cross-section structural member 200, the periphery of the connecting portion 51 where the pair of beams 10 on the left and right sides of the long-length beam 100 are connected by the connecting metal 20 is covered with the wooden panels 50A, 50B, and 50C to reinforce the connecting portion 51. In particular, the covering with the wooden panels 50A, 50B, and 50C increases the amount of fuel to be burned, so that the temperature rise of the connecting metal 20 can be delayed even in the event of a fire, and fire resistance can be improved. Furthermore, if the flange portion 22 of the connecting metal 20 exposed on the underside of the long-length large cross-section structural member 200 is covered with the wooden panel 50C, the design can be improved. In addition, by not exposing the flange portion 22 of the connecting metal 20 in this manner, condensation and rust can be prevented. In particular, if the wood panels 50A, 50B, 50C are made up of orthogonal laminated boards, they have a strength that makes them resistant to deformation and also have high insulating and fire resistance, so that they are highly effective in slowing down the temperature rise of the connecting metal fittings 20 even in the event of a fire and suppressing a decrease in strength.

[0084] Furthermore, in the beam structure 1 of this embodiment 1, as shown in Figures 1 and 13 to 17, a vertical portion 300 is formed below the connecting portion 51 of a pair of left and right beam members 10 of each long beam member 100, and the vertical portion 300 is connected to both longitudinal end portions of each long beam member 100 by a pair of left and right brace portions (diagonal members) 400.

[0085] The vertical section 300 is composed of a rectangular vertical connection section 23 extending downward from the longitudinal center of the flange section 22 in the joining hardware 20 which connects and joins a pair of left and right beams 10, and a long vertical wooden section 73 joined and fixed to the vertical connection section 23. The vertical wood part 73 is made of laminated timber, and its vertical dimension (length) is set taking into consideration the arrangement of the beam structure 1, the design location, etc., but is, for example, approximately 500 to 3000 mm, e.g., approximately 0.13 to 0.5 times the length of the beam material 10, its horizontal dimension (width) is approximately +10 to 100 mm larger than the horizontal dimension (width) of the vertical connection part 23 of the connecting metal fitting 20, e.g., approximately 100 to 800 mm, and its thickness is approximately the same as the beam width (thickness) of a single beam material 10, e.g., approximately 210 mm or 240 mm.

[0086] The vertical wood part 73 has a slit groove 74 at its upper end in the length direction, into which the vertical connection part 23 of the joint metal 20 is inserted. That is, the slit groove 74 (see FIG. 12) into which the vertical connection part 23 is inserted is formed at the center of the thickness direction of the vertical wood part 73 by slitting the wood. The slit groove 74 has a slit length (groove depth) of, for example, about 60 to 90 mm, a slit width of, for example, about 7 to 15 mm, which is larger than the thickness of the vertical connection part 23 of the joint metal 20 by +1 to 3 mm, and penetrates in the left and right direction. Furthermore, at the upper end of the vertical wood part 73, whose thickness is divided into two almost equally by the slit groove 74, a pair of left and right pin holes 79 corresponding to the pair of left and right pin holes 29 formed on the lower side of the vertical connection part 23 are provided penetrating the front and back surfaces (front and back surfaces) in the thickness direction.

[0087] 12 etc., the vertical connection part 23 of the joint metal 20 connecting the pair of beams 10 is inserted into the slit groove 74 formed on the upper end side of the vertical wood part 73, the pin hole 29 in the vertical connection part 23 is aligned with the pin hole 79 in the vertical wood part 73, and a pin 99 is pressed into the pin hole 79 from one front or rear side of the vertical wood part 73, passed through the pin hole 29 in the vertical connection part 23 and hammered into the other side, thereby connecting and fixing the vertical wood part 73 to the vertical connection part 23. That is, the vertical wood part 73 is attached to the vertical connection part 23 of the joint metal 20 by the pin 99 for each of the pair of front and rear long beams.

[0088] At this time, it is preferable to leave a small gap between the upper end face of the vertical wood section 73 and the underside of the underside-covering wood panel 50C attached to the bottom surface of the connecting portion 51 of the pair of left and right beams 10 in the long, large cross-section structural material 200. This makes it possible to prevent a decrease in the rigidity of the vertical wood section 73 caused by the upper end face of the vertical wood section 73 biting into the underside of the underside-covering wood panel 50C even when a load is applied to the long, large cross-section structural material 200.

[0089] The pin holes 79 that penetrate the thickness of the vertical wood section 73 are formed to be about 0.8 to 2 mm, preferably about 0.8 to 1 mm, larger than the diameter of the pins 99 to make it easier to pass the pins 99 through. For example, pins 99 with a diameter of about φ10 to 14 mm are used, and the pin holes 29 and pin holes 79 corresponding to the pins 99 are, for example, about φ11 to 16 mm. Since such pins 99 are attached by hammering or driving them in, they are less loose and allow for a more rigid joint than bolts.

[0090] The length of the pin 99 is approximately the dimension in the thickness direction perpendicular to the longitudinal direction of the beam 10 (the dimension on the short side of the cross section, i.e., the beam width). That is, the pin 99 is pressed into the opening end of the pin hole 79 on one side of one of the front and rear vertical wood parts 73 in the direction perpendicular to the longitudinal direction, passes through the pin hole 29 of the vertical connection part 23 of the joint metal fitting 20 of each vertical wood part 73, and extends to near the opening end of the pin hole 79 on the other side of the vertical wood part 73. The tip of the pin 99 may be long enough to go in a little bit from the opening end of the pin hole 79 on the side of the vertical wood part 73 opposite the side where the pin 99 is inserted, as long as it does not go out from the opening end of the pin hole 79 on the side opposite the side where the pin 99 is inserted.

[0091] However, when implementing the present invention, the length of the pin 99 may be approximately twice the dimension in the thickness direction perpendicular to the length of the beam 10 (the dimension of the short side of the cross section, i.e., the beam width). That is, the pin 99 may be pressed into the opening end of the pin hole 79 on one side of one of the front and rear vertical wood parts 73 in the direction perpendicular to the length, pass through the pin hole 29 of the vertical connection part 23 of the joint metal fitting 20 of each vertical wood part 73, and extend to near the opening end of the pin hole 79 on the other side of the other vertical wood part 73. In this case, the tip of the pin 99 may be long enough to go slightly inward from the opening end of the pin hole 79 on the side of the vertical wood part 73 opposite the side where the pin 99 is inserted, as long as it does not go out beyond the opening end of the pin hole 79 on the side opposite the side where the pin 99 is inserted.

[0092] In this case, of the pair of front and rear long beams 100 that make up the long, large-section structural member 200, the vertical connection portion 23 of the connecting metal fitting 20 that connects and joins the pair of left and right beams 10 on one of the long beams 100 is inserted into the slit groove 74 of the vertical wood portion 73, and the vertical connection portion 23 of the connecting metal fitting 20 that connects and joins the pair of left and right beams 10 on the other long beam 100 is also inserted into the slit groove 74 of the other vertical wood portion 73.In this state, by driving a pin 99 from one side (design surface) of one of the front and rear vertical wood portions 73 toward the other side (design surface) of the other vertical wood portion 73, the vertical wood portions 73 are joined and fixed to the vertical connection portions 23 of the connecting metal fittings 20 of each long beam 100, and the front and rear vertical wood portions 73 are also joined and fixed to each other while embracing each other in the thickness direction perpendicular to the length direction.

[0093] 16, a pair of left and right wood holes 78 are provided penetrating in the thickness direction at the lower part of the vertical wood parts 73 constituting the vertical section 300, through which are inserted roughly cylindrical round bars 380 to which one end in the longitudinal direction of the metal brace part 400 is attached. The pair of left and right wood holes 78 formed on the lower side of each of the pair of front and rear vertical wood parts 73 are at the same height position and penetrate the pair of front and rear vertical wood parts 73. A circular plate 81 made of metal or the like is attached with a number of screws 96 to the design surface side where a pair of wooden holes 78 are opened on the lower side of each vertical wooden section 73 to reinforce the vertical wooden section 73 and to prevent wear due to contact with the brace section 400 attached to the round steel bar 380.

[0094] The circular plate 81 attached to the lower side of the vertical wood section 73 corresponds to the positions of the pair of left and right wood holes 78 that penetrate the thickness of the vertical wood section 73, and has a pair of left and right circular holes 88 (e.g., about φ30-40 mm) that are large-diameter through holes through which round bars 380 to which one longitudinal end of the brace section 400 is attached are inserted, and also has a plurality of small-diameter through holes 86 (e.g., about φ5-10 mm) through which screws 96 are inserted. The dimensions of the circular plate 81 are, for example, about φ100-140 mm and a thickness of about 4-9 mm. The circular plate 81 is attached to each design surface side (front and rear sides) of the pair of front and rear vertical wood pieces 73 by inserting screws 96 (e.g., about φ6-9 mm, 40-80 mm long) into the screw holes 86 of the circular plate 81 and hammering them into the vertical wood pieces 73. The circular plate 81 is usually attached so that its center is located on the center line of the vertical wood pieces 73 along the length direction.

[0095] The round bar 380 is inserted into a pair of left and right wooden holes 78 formed in the thickness direction at the lower side of the vertical wooden section 73 in order to attach the brace section 400 to the lower side of the vertical wooden section 73 of the vertical section 300.The round bar 380 is formed longer than the total thickness of the pair of joined front and rear vertical wooden sections 73, for example, approximately 280 to 360 mm and approximately φ30 to 40 mm, and has through holes 381 (for example, approximately φ23 to 28 mm) formed at both longitudinal ends thereof extending approximately perpendicular to the longitudinal direction, into which one longitudinal end of the brace section 400 is inserted.

[0096] This round bar 380 has a through hole 381 formed at each end on both sides in the length direction, the inner side of which is threaded to form a female screw portion 381a, and the periphery of the opening of the through hole 381 is a flat surface 382. That is, each end on both sides in the length direction of the round bar 380 has a pair of flat surfaces 382 on the front and back, the through hole 381 is drilled between the pair of front and back flat surfaces 382, ​​and the periphery of the through hole 381 is threaded to form a female screw portion 381a.

[0097] 16 and 17, the brace section 400 attached to the round steel bar 380 has its outer peripheral surface at each end on both sides in the length direction threaded to a predetermined length along the length direction to form male thread sections 481a, and nuts 482 are screwed into the male thread sections 481a at predetermined positions on each end to attach them. Each brace section 400 is made up of a pair of divided round steel braces, and bending is prevented by connecting the pair of divided round steel braces with turnbuckles 410.

[0098] Therefore, one end of the brace section 400, on which a male screw section 481a in the longitudinal direction is formed, is inserted into the through hole 381 of the round steel 380, the male screw section 481a of the brace section 400 is screwed into the female screw section 381a formed around the through hole 381 of the round steel 380, and fastened with a nut 482, whereby one end of the brace section 400 is firmly attached in a direction approximately perpendicular to the longitudinal direction of the round steel 380. At this time, the peripheral surface on the opening side of the through hole 381 in the round steel 380 against which the nut 482 abuts is the flat surface 382, ​​so that fastening by the nut 482 can be made stronger.

[0099] In this way, the pair of left and right round bars 380 are each passed through either the left or right of a pair of circular holes 88 in a circular plate 81 attached to the other end of the length direction of one of the pair of joined front and rear vertical wooden parts 73, inserted into either the left or right of a pair of wood holes 78 formed through the thickness of the vertical wooden part 78 on one side, and further inserted into either the left or right of a pair of wood holes 78 formed through the thickness of the vertical wooden part 74 on the other side, and passed through either the left or right of a pair of circular holes 88 in the circular plate 81 attached to the other end of the length direction of the other vertical wooden part 73, penetrating the thickness direction of the pair of joined front and rear vertical wooden parts 73. Then, on the front and rear design surfaces of the joined front and rear vertical wood sections 73, the brace sections 400 are attached to both ends in the longitudinal direction of each round steel 380 that has been inserted in the thickness direction of the pair of front and rear vertical wood sections 74. That is, one end of the brace section 400 with a male screw section 481a in the longitudinal direction is inserted into a through hole 381 provided at each end on both sides in the longitudinal direction of the round steel 380, the male screw section 481a of the brace section 400 is screwed into the female screw section 381a formed around the through hole 381 of the round steel 380, and the brace sections 400 are fastened with nuts 482, thereby attaching the brace sections 400 to both ends in the longitudinal direction of the round steel 380.

[0100] As a result, a pair of left and right brace sections 400 are attached to each vertical wood section 73 via a pair of left and right round bars 380 on each design surface (front and rear) side in the thickness direction perpendicular to the length direction of the joined front and rear vertical wood sections 73. At this time, one end side of the pair of front and rear brace sections 400 is attached approximately perpendicular to the length direction to both end portions in the length direction of each round bar 380 that penetrates the joined front and rear vertical wood sections 73, so that the movement in the length direction of the round bar 380 that penetrates the thickness of the pair of front and rear vertical wood sections 73 is restricted between the pair of front and rear brace sections 400, and the round bar 380 will not come off the pair of front and rear vertical wood sections 73.

[0101] Here, a pair of wooden holes 78 are formed on the left and right at the same height on the lower part of the pair of front and rear vertical wooden sections 73 that are joined together in the thickness direction, and a round bar 380 is inserted into each wooden hole 78, and a brace section 400 is attached to each end on both sides of each round bar 380 in the longitudinal direction. Of the pair of left and right brace sections 400 attached to the left and right sides of each of the front and rear pair of vertical wooden sections 73, one end of one brace section 400 is attached to the left or right side of the lower side of the vertical wooden section 73 via a round steel bar 380, and the other end is attached to the end opposite the longitudinal connection of one of the pair of left and right beams 10 that make up each of the front and rear pair of long beams 100 via a round steel bar 580.Furthermore, one end of the other brace section 400 is attached to the other left or right side of the lower side of the vertical wooden section 73 via a round steel bar 380, and the other end is attached to the end opposite the longitudinal connection of the other beam 10 via a round steel bar 580.

[0102] At both longitudinal ends of each of the pair of front and rear long beams 100, i.e., at the other end opposite the longitudinal connecting side of each pair of left and right beams 10 constituting each long beam 100, a wood hole 14 is provided penetrating in the thickness direction, through which a substantially cylindrical round steel 580 is inserted to which the other end opposite the longitudinal mounting side of the brace section 400 to the vertical wood section 73 is attached. When the pair of front and rear long beams 100 are joined and fixed to each other with long screws 38, the wood holes 14 formed in the embraced pair of front and rear beams 10 are in the same position and penetrate the pair of front and rear beams 10. Furthermore, a circular plate 82 made of metal or the like is attached with a plurality of screws 93 to the design surface side of both longitudinal ends of each long beam 100 to reinforce the beam 10 and prevent wear due to contact with the brace portion 400 attached to the round steel 580.

[0103] This circular plate 82 corresponds to the wood hole 14 drilled through the other end of each beam 10 on the opposite side to the connecting side in the longitudinal direction, and has a circular hole 84 (e.g., about φ30 to 40 mm) in the center which is a large-diameter through hole through which a round steel bar 580 to which the other end of the brace section 400 in the longitudinal direction is attached is inserted, and also has a plurality of screw holes 83 (e.g., about φ5 to 10 mm) which are small-diameter through holes through which screws 93 are inserted. The dimensions of the circular plate 82 are, for example, the same thickness as the circular plate 81 (about 4 to 9 mm) and about φ130 to 180 mm. The circular plate 82 is attached to the design surface side of each beam 10 by inserting a screw 93 (e.g., about φ4-8 mm, 40-80 mm long) into the screw hole 83 of the circular plate 82 and hammering it in the thickness direction of the beam 10. The circular plate 82 is attached at a position, for example, about 300-600 mm away from the end of the beam 10 in the longitudinal direction, that is, at a position away from the end of the beam 10 by a length equivalent to 0.1 to 0.2 times the length of the beam 10, with its center positioned on the center line of the beam 10 in the longitudinal direction.

[0104] The round bar 580 is inserted into a wood hole 14 formed in the other end of the beam 10 in the thickness direction in order to attach the brace section 400 to the other end of the beam 10 in the length direction, and is formed longer than the total thickness of the pair of front and rear beams 10 joined together in the thickness direction, for example, about 280 to 360 mm and about φ30 to 40 mm, and has through holes 581 (for example, about φ23 to 28 mm) formed at each end on both sides in the length direction into which the other end of the brace section 400 in the length direction is inserted. The round bar 580 and the round bar 380 are usually formed to have the same diameter, but they may be different.

[0105] Like the round bar 380, this round bar 580 has a through hole 581 formed at each end on both sides in the length direction, and the periphery of the opening of the through hole 581 is a flat surface 582. That is, at each end on both sides in the length direction of the round bar 580, there is a pair of flat surfaces 582 on the front and back, and the through hole 581 is drilled between the pair of flat surfaces 582. As described above, the brace portion 400 attached to the round bar 580 has its outer peripheral surface at each end on both sides in the longitudinal direction threaded to form male screw portions 481a, and nuts 482 are screwed onto the male screw portions 481a at predetermined positions on each end to attach them.

[0106] Therefore, the other end of the brace section 400, on the opposite side of the connection side to the vertical wood section 73 in the longitudinal direction, on which the male screw section 481a is formed, is inserted into the through hole 581 of the round steel 580, and the brace section 400 is sandwiched and fastened with a nut 482 screwed into the male screw section 481a of the round steel 580 and a separate nut 583 screwed into the male screw section 481a of the round steel 580, so that the other end of the brace section 400 is firmly attached in a direction approximately perpendicular to the longitudinal direction of the round steel 580. At this time, the peripheral surface of the opening side of the through hole 581 in the round steel 580, on which the nuts 482 and 583 abut, is a flat surface 582, so that the round steel 580 can be firmly fastened by the nuts 482 and 583. In the figure, two nuts 583 are used.

[0107] In this way, the round bar 580 is passed through the circular hole 84 of the circular plate 82 attached to the other end in the longitudinal direction of one of the beams 10 of the pair of joined front and rear beams 10, inserted into the wood hole 14 formed penetrating the thickness of the beam 10 on one side, further inserted into the wood hole 14 formed penetrating the thickness of the beam 10 on the other side, passed through the circular hole 84 of the circular plate 82 attached to the other end in the longitudinal direction of the other side, and penetrated in the thickness direction of the pair of front and rear beams 10. Then, on the design surface sides on both sides in the thickness direction of the pair of joined front and rear beams 10, the brace parts 400 are attached to both ends in the longitudinal direction of the round bar 580 that has passed through the thickness direction of the pair of front and rear beams 10. That is, the other end of the brace section 400, on which a male screw portion 481a in the longitudinal direction is formed, is inserted into a through hole 581 provided at each end on both sides in the longitudinal direction of the round steel 580, the male screw portion 481a of the brace section 400 is screwed into the female screw portion 581a formed around the through hole 581 of the round steel 580, and the brace section 400 is attached to each end on both sides in the longitudinal direction of the round steel 580 by fastening with nuts 482, 583.

[0108] As a result, a pair of front and rear brace sections 400 are attached to the beams 10 via round steel bars 580 on both design surfaces (front and back) in the thickness direction perpendicular to the length direction of the pair of joined front and rear beams 10. At this time, the brace sections 400 are attached to each end in the length direction, approximately intersecting the round steel bars 580 that penetrate the pair of joined front and rear beams 10, so that the movement of the round steel bars 580 that penetrate the pair of joined front and rear beams 10 in the length direction is restricted between the pair of front and rear brace sections 400, and the round steel bars 580 will not come off the pair of front and rear beams 10.

[0109] Thus, in this embodiment 1, a pair of front, rear, left and right brace sections 400 are attached diagonally to the front and rear faces of both longitudinal end portions of a pair of front and rear long beam members 100 and to the front and rear faces of each vertical section 300 of the pair of front and rear long beam members 100 extending perpendicular to the longitudinal direction of the beam members 10. The pair of left and right brace portions 400 are preferably attached at positions where they do not contact each other.

[0110] In particular, in the present embodiment 1, a wooden hole 78 is formed in the vertical wood part 73 of the vertical part 300, a round steel bar 380 is inserted therein, and the brace part 400 is attached to the round steel bar 380 by screwing and fastening, and a wooden hole 14 is formed in the beam 10, a round steel bar 580 is inserted therein, and the brace part 400 is attached to the round steel bar 580 by screwing and fastening, thereby connecting the vertical part 300 and each end of the long beam 100 in the longitudinal direction with the brace part 400. Since the assembly can be performed by drilling holes in the wood, attaching the round steel bars 380, 580, and attaching the brace part 400 to the round steel bars 380, 580, the structure, processing, and assembly can be simplified and costs can be reduced, and the brace part 400 can be firmly and easily attached to the vertical part 300 and the beam 10. However, when implementing the present invention, the attachment form of the brace part 400 to the vertical part 300 and the beam 10 is not limited to the above.

[0111] Thus, in the beam structure 1 of the first embodiment, the cross-sectional dimensions of the short side are 7.5 cm or more, the long side are 15 cm or more but less than 15 cm, and the cross-sectional area is 300 cm 2A pair of left and right beams 10 made of wood with a cross section less than 1.0 mm and a length of 4 m or more and 12 m or less are connected and joined with connecting metal fittings 20 to form a long beam 100, and two of the long beams 100 are joined together in their thickness direction with long screws 38 to form a long, large cross section structural material 200. Vertical wood parts 730 are attached with screws 99 to the vertical connection parts 23 of the connecting metal fittings 20 that protrude downward from the joint position of the pair of left and right beams 10 in each of the front and rear pairs of long beams 100 that make up the long, large cross section structural material 200, forming a vertical part 300 consisting of the vertical connection part 23 and the vertical wood part 73 in a direction approximately perpendicular to the longitudinal direction of the beams 10, downward from the joint position of the pair of left and right beams 10, and this vertical part 300 is connected to both longitudinal side ends of each of the front and rear pairs of long beams 100 that make up the long, large cross section structural material 200 with a pair of front, rear, left and right brace parts 400.

[0112] In the beam structure 1 of the first embodiment, the cross-sectional dimensions of the short side are 7.5 cm or more, the long side are 15 cm or more but less than 15 cm, and the cross-sectional area is 300 cm 2 A pair of beams 10 made of wood with a cross section of less than 1.5 mm and a length of 4 m or more and 12 m or less are connected and joined in the longitudinal direction using connecting metal fittings 20 to form a long beam 100, and two long beams 100 are grouped together and joined facing each other on the side surfaces in the thickness direction perpendicular to the longitudinal direction so that the joint boundary positions of the pair of beams 10 approximately coincide, and fixed and joined with long screws 38 to form a long, large cross section structural material 200.

[0113] That is, the long and large cross-section structural member 200 of the first embodiment has a cross-sectional dimension of a short side of 7.5 cm or more and a long side of 15 cm or more, and is a large cross-section member (a short side of 15 cm or more and a cross-sectional area of ​​300 cm 2The long beams 100 are made by joining two beams 10 made of wood of small or medium cross-section material having a length of 4 m or more and 12 m or less, other than the above, in pairs, connected and joined at one end in the longitudinal direction by a joint metal 20, and further, two long beams 100 are made into a pair, facing each other at one side in the thickness direction perpendicular to the longitudinal direction of the beams 10, and joining the pair of beams 10 so that the joint boundary positions of the pair of beams 10 are approximately aligned, and the front and rear pairs of long beams 100 are fixed and joined together with long screws 38. This is relatively easy to manufacture and can be obtained at low cost, and is also easy to transport. A large cross section is formed by joining small or medium cross-section beams 10 having a length of 4 m to 12 m in length in the longitudinal and thickness directions.

[0114] Furthermore, in each of the pair of front and rear long beams 100 that make up the long, large cross-section structural material 200, a vertical wooden section 73 is attached with a screw 99 to the vertical connection section 23 of the connecting metal fittings 20 that protrude downward from the joint position of the pair of left and right beams 10, to form a vertical section 300 consisting of the vertical connection section 23 and the vertical wooden section 73 downward from the joint position of the pair of beams 10, and this vertical section 300 is connected to both longitudinal side end sections of each of the pair of front and rear long beams 100 that make up the long, large cross-section structural material 200 by a pair of left and right brace sections 400.

[0115] According to the beam structure 1 of the first embodiment, the cross-sectional dimensions of the short side are 7.5 cm or more and the long side are 15 cm or more. 2The long beams 100 are made by connecting and joining together beams 10 made of small or medium cross-section wood material with a length of 4m or more and 12m or less using connecting metal fittings 20, which allows the stress to be borne by the connecting metal fittings 20.In addition, the vertical section 300 extended downward from the joint position (center of the span) of the pair of left and right beams 10 is connected to the front and rear faces of the pair of front and rear long beams 100 that make up the long large cross-section structural member 200 (corresponding to the upper chord) by a pair of front and rear, left and right brace sections 400, which allow the brace sections 400 to also bear the stress. That is, according to the beam structure 1 of the present embodiment 1, a so-called beam string structure is formed by the long, large cross-section structural member 200 (corresponding to the upper chord member), the vertical section 300 (corresponding to the beam member) extending downward from the center in the longitudinal direction of the long, large cross-section structural member 200, and the brace section 400 (corresponding to the lower chord member) connecting both longitudinal side ends of the long, large cross-section structural member 200 to the vertical section 300. Since the long, large cross-section structural member 200 bears the compressive force, bending force, and shear force, and the brace section 400 bears the tensile force, the structure is less likely to deform (bend) even when a large span is formed.

[0116] In particular, even if a pair of beams 10 are connected to each other by a joint metal 20 to form a long beam, the vertical portion 300 is extended downward from the joint position of the pair of left and right beams 10, and the vertical portion 300 and the longitudinal end portions of each pair of front and rear long beams 100 constituting the long large cross section structural member 200 are connected by a pair of left and right brace portions 400, so that the deflection of the long beam 100 formed by connecting a pair of beams 10 to each other can be suppressed. That is, the tensile force is borne by each pair of left and right brace portions 400 formed on the front and rear surfaces of the long cross section structural member 200, so that the beam 10 is pushed up by the vertical portion 300, and even if the pair of left and right beams 10 are connected to each other by the joint metal 20, the portion is unlikely to deflect. And the bending moment of the long cross section structural member 200 can be reduced. Therefore, even if a larger span is formed using a longer beam 10, rigidity, strength, and safety that are unlikely to deform can be ensured.

[0117] In this way, in the beam structure 1 of this embodiment 1, two long beams 100, each formed by connecting and joining a pair of beams 10 via connecting metal fittings 20, are fitted together so that the connecting parts 51 of the pair of left and right beams 10 are aligned and faced to each other, and then fixed and joined with long screws 38 to form a long, large cross-section structural member 200, and further, a vertical part 300 is extended downward from the joint position of the pair of left and right beams 10 in each of the front and rear long beams 100 constituting the long, large cross-section structural member 200, and this vertical part 300 and both longitudinal end parts of each of the front and rear long beams 100 constituting the long, large cross-section structural member 200 are connected by brace parts 400, thereby ensuring a predetermined rotational rigidity and rotational moment that are difficult to bend even when long beams 10 of, for example, 6 m or more and 12 m or less are joined together, and ensuring rigidity and strength that are difficult to deform even with a large span of 12 m to 24 m. Therefore, sufficient strength is obtained to make the structure F stable even with a large span.

[0118] Furthermore, in the beam structure 1 of this embodiment 1, the side covering wood panels 50A, 50B and the underside covering wood panel 50C are joined around the connecting portion 51 where a pair of left and right beam materials 10 in a pair of long beam materials 100 at the front and rear that constitute the long-length large-section structural material 200 are connected to each other with connecting metal fittings 20, so that these wood panels 50 can also bear the stress and deflection of the long beam material 100 can be suppressed.

[0119] In addition, the connecting hardware 20 of this embodiment 1 is integrally formed with a rectangular flat plate portion 21 having pin holes 24 through which pins 34 for fixing to each beam material 10 are inserted, a flange portion 22 formed at the lower end of the flat plate portion 21 at right angles to the flat plate portion 21 and in the shape of a long flat plate longer than the horizontal length of the flat plate portion 21, having screw holes 26 through which screws 36 for fixing to each beam material 10 are inserted, and a vertical connection portion 23 extending downward from the center of the flange portion 22 in the longitudinal direction at right angles to the longitudinal direction of the flange portion 22.

[0120] The connecting hardware 20 of this embodiment 1 can be connected and joined together by inserting (slotting) its flat portion 21 into one longitudinal end of each of a pair of left and right beams 10 made of wooden beams 10, each with a length of 4 m or more and 12 m or less, and fixing it to each beam 10 with pins 34, and fixing the flange portion 22 to each beam 10 with screws 36. In particular, the joint metal 20 of the present embodiment 1 is formed in an inverted T shape in side and front views by forming a long flange portion 22 at the lower end of the flat plate portion 21, which is approximately perpendicular to the surface of the flat plate portion 21 and longer than the horizontal length of the flat plate portion 21, and when the surface direction of the flat plate portion 21 is aligned with the front-rear direction (front and back directions) of the pair of beams 10 and inserted into the pair of beams 10, the flange portion 22, which is approximately perpendicular to the surface of the flat plate portion 21 and longer than the horizontal length of the flat plate portion 21, extends along the length direction at the lower side of the pair of beams 10, and the surface direction of the flange portion 22 is up and down. Therefore, by arranging the flange portion 22 of a predetermined width that extends in a direction approximately perpendicular to the vertical cross section of the beams 10 and has a surface direction up and down on the tension side when the pair of beams 10 receives a vertical load such as a live load, the moment resistance and rotational rigidity can be increased, and the support force and resistance against the vertical load can be increased.

[0121] Furthermore, according to the joint metal 20 of the present embodiment 1, the flat plate portion 21 has an opening 25 at its center, which allows for weight reduction and cost reduction. Also, by reducing the deflection of the beam material 10 due to the weight of the joint metal 20, it is possible to further increase the rigidity of the long cross-section structural material 200.

[0122] Thus, in the beam structure 1 of this embodiment 1, in the long, large cross-section structural material 200, the connecting metal fittings 20 joining the pair of left and right beam materials 10 of each long beam material 100 consist of a flat plate portion 21, a flange portion 22 arranged at a right angle thereto, and a vertical connection portion 23 extending vertically from the longitudinal center of the flange portion 22 on the opposite side to the flat plate portion 21, and the flange portion 22 is formed on the underside (bottom side) of the pair of left and right beam materials 10, that is, on the tensile side when subjected to a vertical load such as a live load, and is connected to the flat plate portion 21 in an inverted T-shape when viewed from the side and the front and extends at right angles to the flat plate portion 21. In other words, by arranging the long, flat flange portion 22 extending at a right angle to the longitudinal direction of the beam material 10 and with its surface directions positioned above and below, the supporting force and resistance against loads from above and vertical loads are improved. In addition, the connecting metal 20 is inserted into a pair of beams 10 and fixed with pins 34 and screws 36, and the insertion portion 41 into which the flat portion 21 of the connecting metal 20 fits is also formed as a slit groove 41a, which reduces cross-sectional loss, and therefore there is little reduction in the strength of the wood.

[0123] In addition, in the pair of front and rear long beams 100 that make up the long, large cross-section structural member 200, the side covering wood panels 50A, 50B and the underside covering wood panel 50C are joined around the connecting portion 51 where the pair of left and right beams 10 are connected to each other with connecting metal fittings 20. A vertical section 300 consisting of a vertical connection section 23 and a vertical wood section 73 is formed downward from the joint position of the pair of beams 10, approximately perpendicular to the longitudinal direction of the beams 10, and this vertical section 300 is connected to both longitudinal end sections of the pair of front and rear long beams 100 that constitute the long, large cross-section structural member 200 by brace sections 400.

[0124] Therefore, according to the beam structure 1 of the first embodiment, even when beam members 10 of 4 m or more and 12 m or less are connected to form a longer span, high rigidity and strength are obtained and deformation is difficult to occur. Therefore, as shown in FIG. 1, the beam structure 1 of this embodiment 1 makes it possible to form a large-span frame F that spans between columns as an ascending beam or ridgepole of a wooden building that constitutes a low-rise, medium- to large-scale building such as a factory, gymnasium, or public facility.

[0125] In particular, a pair of long beams 100 are joined together in the longitudinal direction using a joint metal 20, and the long beams 100 are joined together in a pair along the longitudinal direction to form a long, large cross-sectional structural member 200. The short side of the cross-sectional dimensions is 7.5 cm or more, the long side is 15 cm or more but less than 15 cm, and the cross-sectional area is 300 cm. 2 Since the large cross section is formed by joining inexpensively available beams 10 with a cross section of less than 10 mm and a length of 4 m to 12 m, material costs can be reduced. In addition, a pair of beams 10 made of standardized wood are joined together in the length direction with joint metal fittings 20 to form a long beam 100, and two long beams 100 are joined together at their sides to form a long, large cross section structural member 200 that spans between columns. In the frame F, the beams 10 made of standardized wood are joined to the columns, and existing metal fittings can be used for the joint, so costs can be reduced. In addition, unlike a truss frame, the number of assembly steps is small, making construction easy and reducing construction costs.

[0126] And, if the joint metal 20 has a flat plate portion 21 and a flange portion 22 disposed at a substantially right angle thereto, it is easy to position the joint metal 20 when inserted inside the beam material 10, and it is difficult to shift, so that it is easy to assemble and easy to construct. That is, if the joint metal 20 is composed of a flat plate portion 21 and a flange portion 22 disposed at a substantially right angle to the surface thereof, the beam materials 10 can be easily and firmly connected and joined together. Also, by disposing the flange portion 22 at a right angle to the flat plate portion 21 at the bottom of the slit groove 41a formed in the beam material 10, the airtightness inside the slit groove 41a can be improved, so that air and flames during combustion are less likely to enter, and condensation is less likely to occur. In the connection and joining using such a joint metal 20, since no member that deteriorates the joint strength due to changes over time is interposed, the joint strength can be maintained for a long time. Therefore, according to the beam structure 1 of the first embodiment, the material costs and construction costs can be kept low, and therefore the cost can be significantly reduced as a structural material for large spans.

[0127] In addition, the long and large cross-section structural member 200 of the first embodiment is constructed by joining the width of standardized small and medium-sized wooden pieces to secure a fire margin, and a pair of front and rear long beams 100 are joined by embracing their sides, so that the fire margin is only required on three sides of the combined beams. Compared to a single piece of wood that secures a fire margin on four sides, the range of damage caused by combustion is reduced for each beam 10. Also, by joining the beams 10 together, the heat resistance between the joints increases, which can delay combustion. Therefore, it is possible to delay the decrease in strength of the beams 10 and the decrease in the strength of the joint metal 20 due to heat during a fire.

[0128] In the frame F that spans between columns using the beam structure 1 of this embodiment 1, the long large section structural material 200 has a large section to ensure fire resistance, and a separate gypsum board covering is not used to provide fire resistance, so there is no need for scaffolding for the construction of the gypsum board, which reduces construction costs and ensures the exposed wood and aesthetic design of the exterior. The flat plate portion 21 of the joint metal 20 is hidden inside the beam 10 without being visible on the outside, the flange portion 22 is covered by the underside covering wood panel 50C, and the vertical connection portion 23 is inserted into the vertical wood portion 73 and is hardly exposed on the outside, resulting in a good aesthetic design of the exterior.

[0129] In addition, the connecting portion 51 of the long, large cross-section structural member 200 is surrounded by wood panels 50A, 50B, and 50C, and the vertical portion 300 extending downward from the connecting portion 51 is composed of the vertical connection portion 23 and the vertical wood portion 73 attached so as to cover it, so that the design of wood can be expressed not only in the beam member 10, but also in the wood panels 50A, 50B, and 50C, and the vertical portion 300.

[0130] In this way, in the beam structure 1 of the present embodiment 1, the joint metal 20, which is formed integrally with the rectangular flat plate portion 21, the long flange portion 22 disposed at the lower part of the flat plate portion 21 substantially perpendicular to the surface thereof, and the vertical connection portion 23 extending from the center of the flange portion 22 in the longitudinal direction, is a joint metal 20 having a cross-sectional dimension of a short side of 7.5 cm or more, a long side of 15 cm or more but less than 15 cm, and a cross-sectional area of ​​300 cm. 2The connecting metal 20 is inserted into an insertion groove 41 provided at one end in the longitudinal direction of a pair of left and right beams 10 made of wood, each with a cross-section of less than 1.0 mm and a length of 4 to 12 m, and a pin 34 is inserted through a pin hole 24 provided in the flat portion 21 of the connecting metal 20 and a wood hole 44 provided in the pair of beams 10 to fix the flat portion 21 of the connecting metal 20 to the pair of beams 10, and a screw 36 is inserted through a screw 26 hole provided in the flange portion 22 of the connecting metal 20 and pressed into the pair of beams 10 to fix the flange portion 22 of the connecting metal 20 to the pair of beams 10, thereby connecting and joining the pair of left and right beams 10 together in their longitudinal direction and forming a single long beam 100. Then, two of the long beams 100 are assembled into a set, and the butt joint positions of the left and right beams 10 of each front-rear pair of long beams 100 are roughly aligned so that their sides face each other and are joined together. Long screws 38 are then pressed into multiple points along the length of the pair of long beams 100 perpendicular to the length of the pair, and the pair of long beams 100 are joined and fixed together to form a long, large cross-section structural material 200.

[0131] Furthermore, a vertical wooden section 73 is attached to the vertical connection section 23 of the joint metal fittings 20 extending downward from the joint position of the pair of left and right beams 10 of each of the front and rear pairs of long beams 100 of the long, large cross-section structural member 200 to form a vertical section 300, and the lower side of the vertical wooden section 73 is connected to each end section on both sides of the length of each of the front and rear pairs of long beams 100 by brace sections 400. Thus, the frame F in which the beam structure 1 is supported by the columns spans long spans between the columns using the long, large cross-section structural members 200, and the beam structure 1 of this embodiment 1 is used, for example, as a climbing beam or ridgepole of a medium to large-scale building as shown in FIG. 1.

[0132] When the beam structure 1 of this embodiment 1 is used as a climbing beam in a medium to large-scale building, for example, as shown in Figure 20, the vertical sections 300 of adjacent beam structures 1 can be connected to each other by a separate brace section 800, making it more resistant to deformation. For example, as described above, one end of each pair of braces 800 is attached to the beam 600 connecting adjacent beam structures 1 using round steel, circular plates, etc., and the other end is attached to the lower part of the vertical part 300 of each adjacent beam structure 1 at a position separate from the brace part 400. This makes it possible to improve the bearing strength of the entire climbing beam.

[0133] According to the beam structure 1 of the first embodiment, the short side of the cross-sectional dimension is 7.5 cm or more, and the long side is 15 cm or more. 2 The long beams 10 are made by connecting and joining two pairs of beams 10 made of wood with a length of 4 m or more and 12 m or less using a metal joint 20 at one end in the longitudinal direction of the pair. Furthermore, two long beams 100 are made into a pair, facing each other at one side in the thickness direction perpendicular to the longitudinal direction of the beams 10, and joined together so that the joint boundaries of the pair of left and right beams 10 are approximately aligned to form a long large cross section structural material 200. In each of the front and rear pairs of long beams 100, the metal joints 20 are inserted into the pair of left and right beams 10, and the pair of left and right beams 10 and the metal joints 20 are fixed to each other with pins 34 and screws 36, connecting and joining the pair of beams 10 together, so that the metal joints 20 can bear stress.

[0134] In particular, the joint metal 20 that is inserted into a pair of beams 10 and connects the pair of beams 10 is formed in an inverted T shape in front and side views with a rectangular flat plate portion 21 and a long flange portion 22 that is integrally provided at the lower end of the flat plate portion 21 perpendicular to the surface of the flat plate portion 21, and the flange portion 22 that extends along the length of the beams 10 and has a surface that is approximately perpendicular to the length of the beams 10 is disposed on the lower side of the pair of beams 10 into which the joint metal 20 is inserted, that is, on the tensile side of the pair of beams 10 that receives a vertical load from above, such as a live load, so that the support force and resistance against the vertical load can be improved. Furthermore, the thin flat plate portion 21 of the joint metal 20 is inserted parallel to the length of the pair of left and right beams 10, so that cross-sectional loss of the wood is reduced.

[0135] In addition, long beams 100 are made by joining small to medium cross-section pieces of wood (beams 10) measuring 4 to 12 m in length, and are paired together with their sides perpendicular to the longitudinal direction facing each other. They are then fixed at multiple points along the longitudinal direction with long screws 38 to form a large cross-section, which significantly prevents bending deformation.

[0136] The vertical wooden section 73 is attached to the vertical connection section 23 of the joint metal fittings 20 extending downward from the joint position of the pair of left and right beams 10 of each of the front and rear pairs of long beams 100 of the long, large cross-section structural member 200 to form the vertical section 300, and the lower side of the vertical wooden section 73 is connected to both longitudinal end sections of each of the front and rear pairs of long beams 100 on both the front and rear sides of the long, large cross-section structural member 200 by a pair of left and right brace sections 400, so that the brace sections 400 can also bear the stress, thereby further preventing bending deformation of the long beams 100.

[0137] In addition, since the side covering wood panels 50A, 50B and the underside covering wood panel 50C are joined around the connecting parts 51 where a pair of left and right beams 100 in a pair of long beams 100 at the front and rear that make up the long, large cross-section structural material 200 are connected by connecting metal fittings 20, the stress can also be borne by these wood panels 50A, 50B, 50C and deflection of the long beam 100 can also be suppressed.

[0138] Therefore, according to the beam structure 1 of this embodiment 1, even if short and medium-length wooden beams (beam material 10) having a length of 4 m to 12 m are joined to form a long structure, a predetermined moment resistance and rotational rigidity can be obtained and rigidity can be ensured, so that bending deformation is small even over a large span.

[0139] Therefore, according to the beam structure 1 of the present embodiment 1, which is composed of a long, large cross section structural member 200 formed by joining 4m to 12m long pieces of timber with small and medium cross sections in the length direction and the width direction perpendicular thereto, a vertical portion 300 extending downward from the joint position of a pair of left and right beams 10 of each of a pair of long beams 100 at the front and rear of the long, large cross section structural member 200, and a brace portion 400 connecting the lower side of the vertical portion 300 to both longitudinal end portions of each of the pair of long beams 100 at the front and rear, material costs can be reduced because 4m to 12m long pieces of timber with small and medium cross sections can be obtained at low cost, and further, if 4m to 12m long pieces of timber are used, the transportation costs to the assembly site can be reduced. In addition, by inserting connecting metal fittings 20 into a pair of beams 10 made of wooden beams 10 each 4 to 12 m long and having small and medium cross sections, and fixing the pair of beams 10 and the connecting metal fittings 20 with pins 34 and screws 36, the pair of beams 10 are joined via the connecting metal fittings 20 to form a long beam 100, and further by joining a pair of long beams 100 together on their sides and fixing them with long screws 38, a long, large cross-section structural member 200 is formed which can be easily assembled and constructed, thereby keeping construction costs down. Therefore, according to the beam structure 1 of the first embodiment, the frame groove F supported by the pillars can be constructed at low cost.

[0140] The beam structure 1 of this embodiment 1 forms a rack F, which is supported by columns and is a long, large-section structural member 200 used as a climbing beam or ridgepole, etc., and is formed by joining beams 10 made of timber with small or medium cross sections and measuring 4 to 12 m in length in the longitudinal direction and in the width direction perpendicular thereto. The beams can be joined to the columns using existing metal fittings that are used to join timber with small or medium cross sections, and no special metal fittings are required, resulting in low cost.

[0141] In addition, the frame groove F formed by the beam structure 1 of this embodiment 1 is designed to ensure fire resistance by joining long beams 100, which are made by joining small and medium-sized wooden pieces of 4 to 12 m long, together on one side (side) of both sides in the width direction perpendicular to the length direction, and joining and fixing them with long screws 38 to form a large cross section, thereby ensuring fire resistance design, making it possible to create a structure that meets the quasi-fire resistance (45 minutes) standard for medium and large buildings. Also, according to the frame groove F formed by the beam structure 1 of this embodiment 1, the flat plate part 21 and flange part 22 of the joint metal 20 are inserted inside the pair of beams 10, the lower surface of the flange part 22 is covered with the lower surface covering wood panel 50C, and further, the vertical connection part 23 is inserted into the vertical wooden part 72, and the joint metal 20 is hardly exposed to the outside, so that the wood is exposed, that is, the design is also ensured. In addition, since it does not require the installation of fireproof gypsum boards, etc., and there is no need to assemble scaffolding for installing gypsum boards, etc., construction is easy and low cost. Therefore, it is possible to achieve both the design of wood that can create a wooden space and low cost. In this way, when beams 10 of small and medium cross-section are joined to form a large cross-section, the fuel reserve is limited to three surfaces of each beam 10. This means that, compared to a case in which fuel reserve is secured on four surfaces of a single piece of wood, the area of ​​damage caused by combustion is smaller for each beam 10. Also, since there is thermal resistance between the joints of each beam 10, it is possible to slow down the combustion and also to prevent loss of strength due to heat.

[0142] In addition, a pair of beams 10 made of low-cost, small- or medium-sized lumber (commonly available material) 4 to 12 meters long are joined together in the longitudinal direction with joint metal fittings 20 to form long beams 100, and two pairs of long beams 100 are joined together in the width direction to form long, large cross-section structural members 200. In addition, vertical portions 300 extending downward from the joint positions of the pair of left and right beams 10 of each of the front and rear pairs of long beams 100 of the long, large cross-section structural members 200 are joined to both end portions of the front and rear pairs of long beams 100 in the longitudinal direction by bracing members 202. In a structure in which a large span is spanned by a beam structure 1 connected by brace sections 400, not only can material costs be reduced, but the long, large cross-section structural members 200, vertical sections 300, and brace sections 400 can be easily assembled at the construction site. Even for long members, they can be transported to the construction site in the form of small, medium-sized timber pieces 4 to 12 m long, making transportation and delivery easy. There is no need to consider transportation vehicles and delivery routes, as is the case when custom-made beams are used, and transportation costs can be reduced.

[0143] The inventors have now discovered that a pair of left and right beams 10 (cypress laminated timber) made of standardized small to medium cross-section wood are connected and joined to each other using a metal joint 20 consisting of a rectangular flat plate 21, a long flange 22 formed at the lower end of the flat plate 21 perpendicular to the surface of the flat plate 21, and a vertical connection portion 23 extending downward from the center of the length of the flange 22 to form a long beam 100, and that two of the long beams 100 are joined together in the thickness direction perpendicular to the length of the wood to form a long large cross-section structural material 200, and that the pair of joined front and rear long beams 100 are joined at approximately the center of the length of the pair, i.e. The maximum strength and rigidity of a test specimen of a beam structure 1 was measured, the specimen comprising a long, large cross-section structural material with covering panel 200 in which wood panels 50A, 50B, 50C are joined at the connection part 51 between a pair of left and right beams 10 so as to cover the underside of the four surrounding surfaces and both side surfaces perpendicular thereto, a vertical part 300 extending downward from the joint position of a pair of left and right beams 100 of each of the front and rear pairs of long beams 100 of the long, large cross-section structural material with covering panel 200, and a brace part 400 connecting the lower side of the vertical part 300 to both longitudinal end parts of each of the front and rear pairs of long beams 100.

[0144] Here, beams 10 made of flat square lumber laminated timber with a cross-sectional short side of 120 mm, a cross-sectional long side of 450 mm, and a length of 4980 mm are connected by joint metal fittings 20 to form a long beam 100 with a length of 9960 mm, and two of the long beams 100 are joined together in the thickness direction to form a long, large cross-sectional structural member 200. Furthermore, wooden panels 50A, 50B, and 50C are joined around the connecting parts 51 between the beams 10 to form the long, large cross-sectional structural member 200 with a covering panel. The lower side of the vertical part 300 and both ends in the longitudinal direction of each pair of front and rear long beams 100 are connected by steel brace parts 400 with a diameter of 12 mm to test specimen A. Beams 10 made of laminated flat square timber with a cross-section long side of 450 mm and a length of 4,980 mm were connected with connecting metal fittings 20 to embrace a pair of front and rear long beams 100 with a length of 9,960 mm in the thickness direction, and wood panels 50A, 50B, 50C were joined around the connecting parts 51 between the beams 10 to create a long, large cross-section structural material 200 with a covering panel. Multiple test specimens B were created in which the lower sides of the vertical parts 300 were connected to both longitudinal end parts of each of the pair of front and rear long beams 100 with steel brace parts 400 with a diameter of 20 mm, and the maximum strength and rigidity of test specimens A and B, which have different thicknesses of brace parts 400, were measured.

[0145] For each of the test specimens A and B that were prepared, as shown in Figure 18, both longitudinal end portions of the beam structure 1 were placed on a support S having a raising jig J that can adjust the support height and installed on the ground, so that the lower end of the central vertical part 300 of the beam structure 1 was spaced a predetermined height from the ground, and both end portions of the beam structure 1 were supported at a predetermined height by the support S. In this state, a vertical load was applied equally to the left and right sides from above the long, large cross-section structural member 200 of the beam structure 1, and the amount of deflection of the connecting part 51 and the load at which destruction occurred when the vertical load was applied were measured, and the maximum strength and rigidity were calculated from these measured values.

[0146] As a result, it was confirmed that specimen A had a maximum strength of 202 kN and a rigidity of 2.1 Kn / mm (at 1 / 400 rad) or more, and specimen B had a maximum strength of 212 kN and a rigidity of 2.9 Kn / mm (at 1 / 400 rad) or more, and that even with a large span, deformation or deflection was unlikely to occur. In addition, it was confirmed that the strength was improved by making the brace section 400 thicker, and that the brace section 400 was able to bear stress.

[0147] As described above, the beam structure 1 of the above-mentioned embodiment 1 comprises a pair of left and right beams 10 made of wood of approximately the same length, 4 m or more and 12 m or less, and connecting metal fittings 20 that connect and join the pair of left and right beams 10 together at one end in the longitudinal direction, forming a long, large cross-section structural member 200 formed by joining a pair of front and rear long beams 100 of approximately the same length facing each other in the thickness direction perpendicular to the longitudinal direction, a vertical section 300 extending downward from the joint position between the pair of left and right beams 10 in each of the front and rear pair of long beams 100 in a direction perpendicular to the longitudinal direction of the beams 10, and a pair of front, rear, left and right brace sections 400 that connect each end on both sides in the longitudinal direction of the pair of front and rear long beams 100 to the vertical section 300.

[0148] Therefore, according to the beam structure 1 of the above embodiment 1, a pair of beams 10 made of wooden material having a length of 4 m or more and 12 m or less are butted together at one end in the longitudinal direction and connected and joined with a joint metal 20 to form a long beam 100, and the pair of long beams 100 are joined facing each other in the thickness direction perpendicular to the longitudinal direction to form a long, large cross-section structural material 200, and further, a vertical section 300 is provided in each long beam 100 extending downward from the joint position between the pair of beams 10 in a direction perpendicular to the longitudinal direction of the beams 10, and both longitudinal end sections of each long beam 100 are connected by brace sections 400.

[0149] Therefore, a pair of wooden beams 10 measuring 4 m or more and 12 m or less are butted together at one end in the longitudinal direction and connected with connecting metal fittings 20 to form a long beam 100, and further, a pair of long beams 100 are faced each other in the thickness direction perpendicular to the longitudinal direction and fixed and joined with long screws 38 to form a long, large cross-section structural material 200 with a large cross section. In addition to the stress burden borne by the connecting metal fittings 20, stress can also be borne by the brace sections 400, as each long beam 100 has a vertical section 300 extending downward from the joint between the left and right beams 10 in a direction perpendicular to the longitudinal direction of the beams 10, and each long beam 100 has both ends in the longitudinal direction connected by brace sections 400. As a result, even when beams 10 of 4m to 12m in length are joined together, high strength and rigidity are obtained that make it difficult for deflection to occur, and long spans are formed by joining 4m to 12m beams in the length and thickness directions, which can be obtained at low cost and do not incur transportation costs, making it possible to form large-span frames at low cost in small to medium-sized wooden buildings.

[0150] Furthermore, two long beams 100 (two pieces) made of beams 10 with lengths of 4m to 12m connected with metal joints 20 at the small and medium cross sections are embraced in the thickness direction relative to their length direction to form a large cross section, so that even if it burns, the damage to each beam 10 is limited to three surfaces excluding the joint surfaces (opposing surfaces) between a pair of long beams in the front and rear, and since thermal resistance occurs between the joints of the beams 10 facing each other in the front and rear direction, it is possible to delay the burning and suppress the loss of strength due to heat. Therefore, fire resistance can be improved.

[0151] In particular, according to the beam structure 1 of the first embodiment, the joint metal 20 is composed of a rectangular flat plate portion 21, a long flange portion 22 formed at the lower end of the flat plate portion 21 substantially perpendicular to the surface of the flat plate portion 21 and longer than the horizontal dimension of the flat plate portion 21 in the left-right direction, and a vertical connection portion 23 extending downward from the center of the length of the flange portion 22 in a direction perpendicular to the length direction and constituting a part of the vertical portion 22. Therefore, the flange portion 22 is formed at the lower end of the flat plate portion 21 substantially perpendicular to the surface of the flat plate portion 21 and has upper and lower surfaces wider than the horizontal dimension of the flat plate portion 21 in the left-right direction and extending in the thickness direction and left-right direction of the flat plate portion, thereby increasing moment resistance against vertical loads and rotational rigidity. Therefore, high strength can be improved.

[0152] In addition, the beam structure 1 of the above-mentioned embodiment 1 further includes wood panels 50A, 50B, 50C which cover the front and rear surfaces in the thickness direction perpendicular to the longitudinal direction of the long beam material 100 and the underside perpendicular thereto at the connecting portion 51 formed by the joint metal fittings 20 between a pair of left and right beam materials 10 constituting the long beam material 100 in the long-length large cross-section structural material 200. Therefore, the wooden panels 50A, 50B, 50C covering the front and rear surfaces in the thickness direction perpendicular to the length of the long beam 100 and the lower surface perpendicular thereto reinforce and stiffen the joint between the pair of beams 10 constituting the long beam 100 in the long large cross-section structural material 200, and also improve fire resistance. In particular, the joint metal 20 and the wooden panels 50A, 50B, 50C function as a moment-resisting joint and can bear stress. Furthermore, because the wooden panels 50A, 50B, 50C are made of wood, design is also ensured. Furthermore, in the beam structure 1 of the first embodiment, the vertical portion 300 is formed of the vertical wood portion 73 made of an aggregate of wood, so that the design quality of wood can be expressed.

[0153] In the above embodiment 1, a configuration was described in which separate vertical wooden parts 73 (two pieces) are connected to the vertical connection parts 23 of the joint metal fittings 20 that connect each pair of left and right beams 10 of each front and rear pair of long beams 100.However, when implementing the present invention, it is also possible to use a single vertical wooden part 73 and connect it to each vertical connection part 23 to form a single vertical part 300.

[0154] Second Embodiment The beam structure 1 of the above-mentioned embodiment 1 is formed by joining together 4m to 12m long beams 10 of small and medium length, which are available at low cost, in their longitudinal direction using connecting metal joints 20 to form a long beam 100, and further by joining two long beams 100 together in the thickness direction perpendicular to their longitudinal direction and fixing them together with long screws 38 to form a large cross section. Therefore, a span of 4m to 12m long beams 10 can be formed with inexpensively available small to medium-sized and intermediate sections, and further, a large cross section can be formed by joining a pair of long beams 10 each having a length of 4m to 12m in length in the thickness direction to form a pair of long beams, thereby enhancing rigidity. This enables large spans to be produced at lower cost, making it possible to construct large-span trestles F in medium to large-sized wooden buildings, such as low-rise gymnasiums, schools, community centers, assembly halls, factories, companies, offices, temples, churches, etc. In particular, because the large cross section is formed by joining together the front and rear faces (sides) of the beams 10, each of which is 4m or more and 12m or less in length, perpendicular to the length direction, even if it burns, damage will be limited to three faces of each beam 10 excluding the opposing face, and because thermal resistance occurs between the opposing joints of the pair of long beams 100, it is possible to delay the burning and prevent the loss of strength due to heat. This results in high fire resistance.

[0155] However, when implementing the present invention, the beam structure 1A may be made up of one long beam 100 formed by joining a pair of beams 10 of 4m to 12m long short and intermediate lengths together, not by joining them in the thickness direction, but by joining a pair of long beams 10 of 4m to 12m long short and intermediate lengths together in the length direction, a vertical section 300 extending downward from the joining position of the pair of beams 10 in a direction perpendicular to the length direction of the beam 10, and a brace section 400 connecting both ends of the long beam 100 in the length direction to the vertical section 300. In this beam structure 1A, there is only a cross section of one long beam 100, but it has a cross-sectional dimension of a short side of 7.5 cm or more, a long side of 15 cm or more but less than 15 cm, and a cross-sectional area of ​​300 cm. 2Even if the beam is a small or medium cross-sectional member having a cross section of less than 15 cm, it has sufficient strength for the span of a small or medium-sized wooden structure, for example, a wooden house, and can be applied to the frame F of such a structure. 2 The above-mentioned large cross-section materials, like the long large cross-section structural material 200, can be applied to the frames F of the above-mentioned medium- to large-scale wooden buildings.

[0156] That is, as shown in FIG. 19, the beam structure 1A of this embodiment 2 comprises a long beam 100 consisting of a pair of beams 10 made of wood of approximately the same length, 4 m or more and 12 m or less, and a connecting metal fitting 20 that connects the pair of beams 10 together by butting them together at one end in the longitudinal direction, a vertical portion 300 extending downward from the joint position between the pair of left and right beams 10 that constitute the long beam 100 in a direction perpendicular to the longitudinal direction of the beams 10, and a brace portion 400 that connects each end in the longitudinal direction of the long beam 100 to the vertical portion 300.

[0157] In the above-mentioned embodiment 1, a pair of beams 10 are connected together with joint metal 20 to form a long beam 100, and the two long beams are joined together in the thickness direction perpendicular to the length direction to form a large cross section. In contrast, in this embodiment 2, the long beams 100 are not joined together but rather a long span is formed by themselves. In the above-mentioned embodiment 1, there are two long beam materials 100 (two pieces), whereas in this embodiment 2, there is only one long beam material 100, and the configurations of the vertical section 300 and the brace section 400 are the same as in the above-mentioned embodiment 1, so explanations that overlap with the above-mentioned embodiment 1 will be omitted here.

[0158] In the beam structure 1A of this embodiment 2, a pair of beams 10 made of wood having a length of 4 m or more and 12 m or less are butted together at one end in the longitudinal direction and connected and joined with a joint metal 20 to form a long beam 100, and further, a vertical section 300 extends downward from the joint position between the pair of left and right beams 10 in a direction perpendicular to the longitudinal direction of the beams 10 in the long beam 100, and each end on both sides in the longitudinal direction of the long beam 100 is connected by a brace section 400.

[0159] Therefore, a pair of beams 10 made of wood with a length of 4 m or more and 12 m or less are butted together at one end in the longitudinal direction and connected and joined with a joint metal 20 to form a long beam 100.In addition to the stress burden provided by the joint metal 20, stress can also be borne by the brace sections 400, which connect the vertical sections 300 extending downward from the joint position of the pair of beams in the long beam 100 at right angles to the longitudinal direction of the beams 10 and the brace sections 400 connecting both ends of the long beam 100 in the longitudinal direction. As a result, even when beams 10 of 4m to 12m in length are joined together, high strength and rigidity are obtained that are unlikely to cause deflection, and since long spans are formed by joining 4m to 12m beams 10 that can be obtained at low cost and do not require transportation costs, if the beams 10 have a large cross section, it is possible to form a large span frame groove F at low cost in medium to large wooden buildings. Also, even if the beams 10 have small or intermediate sections, it is possible to form a large span frame groove F at low cost in small to medium wooden buildings.

[0160] Furthermore, in the beam structure 1A of the second embodiment, by covering the front and rear surfaces in the thickness direction perpendicular to the length direction of the beam 10 and the lower surface perpendicular thereto with wood panels 50A, 50B, 50C at the connection parts 51 of the joint metal fittings 20 between the pair of beams 10, the joint between the pair of beams 10 constituting the long beam 100 is reinforced and stiffened, and fire resistance is also improved. Furthermore, because the wood panels 50A, 50B, 50C are made of wood, design is also ensured.

[0161] Also, in the beam structure 1A of the second embodiment, the metal joint 20 is made up of a rectangular flat plate portion 21, a long flange portion 22 formed at the lower end of the flat plate portion 21 substantially perpendicular to the surface of the flat plate portion 21 and longer than the horizontal dimension of the flat plate portion 21 in the left-right direction, and a vertical connection portion 23 extending downward from the center of the length of the flange portion 22 in a direction perpendicular to the length direction and constituting a part of the vertical portion 300, so that the flange portion 22 is formed at the lower end of the flat plate portion 21 substantially perpendicular to the surface of the flat plate portion 21 and has upper and lower surfaces wider than the horizontal dimension of the flat plate portion 21 in the left-right direction and extending in the thickness direction and left-right direction of the flat plate portion, thereby increasing moment resistance against vertical loads and rotational rigidity. Therefore, high strength can be improved. Furthermore, in the beam structure 1A of the second embodiment, the vertical portion 300 is formed from the vertical wood portion 73 made of an aggregate of wood, thereby making it possible to express the design quality of wood.

[0162] In the above first and second embodiments, the pins 34 and screws 36 are used to fasten the beams 10 to the joint metal 20, and the pins 99 are used to fasten the joint metal 20 to the vertical wood section 76, but when implementing the present invention, the fasteners are not limited to these, and screws or screws may be used instead of the pins, or pins and screws may be used instead of the screws. Also, pins and screws may be used instead of the screws 36 driven into the upper side of the connecting parts 51 between the beams 10, and the screws 38 that join the pair of front and rear beams. Furthermore, although the screws 93 and 96 are used to attach the plates 81 and 82 to the beams 10 and the vertical wood section 76, pins and screws may be used.

[0163] In the above first and second embodiments, the metal joint 20 has a vertical connection 23 extending downward from the center of the flange 22 at a right angle to the longitudinal direction, and the vertical wood 76 is connected to the vertical connection 23 to form the vertical part 300, which provides a strong connection between the long beam 100 and the vertical part 300. However, when the present invention is implemented, the configuration of the vertical part 300 is not limited to the above, and for example, the vertical connection 23 of the metal joint 20 may be omitted, and the vertical wood 76 may be directly joined and fixed to the underside of the beam 10 or the underside-covering wood panel 50C using screws, pins, screws, etc. to form the vertical part 300. When the present invention is implemented, the circular plates 81 and 82 may also be omitted.

[0164] In addition, when implementing the present invention, the configuration, shape, quantity, material, size, connection relationship, assembly method, etc. of other parts of the beam structure 1, 1A are not limited to the above embodiment. Note that the numerical values ​​given in the present invention indicate suitable values ​​for implementation, and therefore even if the numerical values ​​are changed, the implementation is not denied. [Explanation of symbols]

[0165] 1 beam structure 10 Beam material 20 Metal joints 21 Flat plate part 22 Flange 23 Vertical connection 50(50A,50B,50C) Wood panel 51 Connecting part 100 Long beams 200 Long and large cross-section structural materials 300 Vertical section 400 Brace section

Claims

1. A long, large-section structural member is formed by joining a pair of long beams made of wood with a length of 4 m or more and 12 m or less, and a pair of front and rear long beams made of metal joints that butt-join the pair of left and right beams at one end in the longitudinal direction, the pair of long beams being opposed to each other in the thickness direction perpendicular to the longitudinal direction; A vertical portion extending downward from a joint position between the pair of left and right beam members in a direction perpendicular to the longitudinal direction of the beam members in each of the long beam members; A pair of front / rear and left / right brace sections connecting the front / rear surfaces and the vertical section at both ends of the pair of front / rear long beam members in the longitudinal direction; A beam structure comprising:

2. The beam structure as described in claim 1, further comprising a wooden panel covering both the front and rear surfaces in the thickness direction perpendicular to the longitudinal direction of the long beam material and the underside perpendicular thereto at the connection portions of the pair of left and right beam materials constituting each of the long beam materials in the long-length, large-section structural material using the metal joints.

3. A pair of left and right beams made of wood with a length of 4 m or more and 12 m or less, and a metal joint connecting the pair of left and right beams together in a state where one end of each beam is butted against the other in the longitudinal direction; A vertical portion extending downward from a joint position between the pair of left and right beam members of the long beam member in a direction perpendicular to the longitudinal direction of the beam member; A pair of front, rear, left and right brace sections connecting the front and rear surfaces and the vertical section at both ends of the long beam material in the longitudinal direction; A beam structure comprising:

4. The beam structure as described in claim 3, further comprising a wooden panel covering both the front and rear surfaces in the thickness direction perpendicular to the longitudinal direction of the beam material and the underside perpendicular thereto at the connection portion between the pair of left and right beam material by the metal joint.

5. 4. The beam structure according to claim 1, wherein the vertical portion is made of wood.

6. The beam structure described in claim 1 or claim 3, characterized in that the connecting metal comprises a rectangular flat plate portion, a long flange portion formed at the lower end of the flat plate portion perpendicular to the surface of the flat plate portion and longer than the left-right horizontal dimension of the flat plate portion, and a vertical connecting portion extending downward from the center of the length of the flange portion in a direction perpendicular to the length direction and constituting part of the vertical portion.

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