Wooden truss beam

Abstract

To provide a wooden truss beam capable of realizing a structure strong in a longitudinal direction while reducing cost, and causing other structures to intersect with each other while suppressing reduction of strength.SOLUTION: A wooden truss beam 100 comprises: an upper chord 110; a lower chord 120; a bundle material 130; and an oblique material 140. The upper and lower chords 110 and 120 include first shafts 111 and 121 and second shafts 112 and 122 formed by arranging shaft materials 113, 114, 123 and 124 in a longitudinal direction. The first shafts 111 and 121 are vertically arranged side by side so as to be positioned closer to the bundle material 130 side than the second shafts 112 and 122. The first shafts 111 and 121 and the second shafts 112 and 122 are arranged by misaligning the shaft materials 113 and 123 and the shaft materials 114 and 124 in the longitudinal direction so that the ends 113s and 123s of the shaft materials 113 and 123 and the ends 114s and 124s of the shaft materials 114 and 124 can be at different positions in the longitudinal direction.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a wood truss beam. [Background technology]

[0002] The roof and floor of a building may be realized by a truss structure. In particular, such a truss structure may be formed from wood to form the roof and floor of a large space such as a gymnasium or a warehouse. For example, Patent Document 1 describes a configuration in which truss beams, each of which includes a truss web member made up of an upper chord, a lower chord, a beam, and a diagonal member, are arranged side by side in the beam width direction, and the arranged truss beams are connected to each other via connecting plates in an upright state. Patent Document 1 also describes that instead of using a single plate material for the upper chord and the lower chord, multiple plates connected together can also be used. Patent Document 2 describes a wooden truss beam structure consisting of an upper chord, a lower chord, and an intermediate member. Patent Document 2 also describes that when the wooden truss beam structure becomes long, both the upper chord and the lower chord are connected to each other.

[0003] In this way, Patent Documents 1 and 2 describe the use of single pieces of board material or connected pieces as upper and lower chord members. However, if a single long plate were to be used as the upper chord or lower chord, the cost would be high. Also, since the length of a single plate is limited, it is not easy to achieve a long span. On the other hand, when connecting multiple plate members to form upper and lower chords, in order to realize a strong structure that can achieve a long span, it is necessary to devise a joint structure at the joints of these plate members in order to obtain a joint strength strong enough to resist the stress acting on the upper and lower chords. However, this often requires special processing of the plate members and special joint hardware, which increases costs.

[0004] In response to this, Patent Document 3 describes a configuration in which multiple truss frames are arranged at intervals in the width direction and connected by a connecting mechanism. Patent Document 3 also describes that the upper and lower members of the truss frame are joined by overlapping them in the width direction with a shift in the axial direction. In Patent Document 3, the upper and lower members are overlapped and joined in the width direction with an axial offset to form the upper and lower chords. In this type of structure, it is not necessary to use a single piece of plate material for the upper and lower chords, and the upper and lower members extend in the length direction at any point in the length direction to form a through member, so there is a possibility that a strong structure can be realized while reducing costs.

[0005] Here, when another structure such as a beam is to be crossed with this truss frame, the members of the other structure are joined to the side of the upper chord or the lower chord, as in the connecting mechanism of Patent Document 3. Therefore, the other structure in the crossing direction is divided by the truss frame by being joined to the side of the truss frame. Therefore, the divided part does not have enough strength to resist the stress acting in the crossing direction, and it may not be easy to make the other structure in the crossing direction strong. In order to compensate for the strength, it is possible to devise a joint structure between the truss frame and the other structure, but this often requires special processing of the members and special joint hardware, etc., which increases costs. There is a demand for a wooden truss beam that can achieve a strong structure in the longitudinal direction while reducing costs and that can cross other structures without reducing the reduction in strength. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2015-209725 A [Patent Document 2] Patent No. 4614151 [Patent Document 3] JP 2019-124097 A Summary of the Invention [Problem to be solved by the invention]

[0007] The problem that the present invention aims to solve is to provide a wooden truss beam that can achieve a strong structure in the longitudinal direction while reducing costs and can cross other structures without reducing the reduction in strength. [Means for solving the problem]

[0008] In order to solve the above problems, the present invention employs the following means. In other words, the wooden truss beam of the present invention is a wooden truss beam that forms the roof or floor of a structure, and comprises wooden upper and lower chords, as well as bundle members and diagonal members that connect the upper and lower chords in the vertical and diagonal directions, respectively, and either or both of the upper and lower chords have a first shaft portion and a second shaft portion formed by arranging shaft members in the longitudinal direction, and the first shaft portion and the second shaft portion are arranged side by side one on top of the other so that the first shaft portion is located closer to the bundle member than the second shaft portion, and the first shaft portion and the second shaft portion are arranged with the shaft members shifted in the longitudinal direction so that the ends of the shaft members are in different positions in the longitudinal direction, and the shaft members are joined to each other vertically. According to the above-mentioned configuration, either or both of the upper chord and the lower chord of the wooden truss beam are constructed by arranging the shaft members in the length direction to form the first shaft portion and the second shaft portion, arranging them vertically, and joining the shaft members vertically. Here, the first shaft portion and the second shaft portion are arranged with the shaft members shifted in the length direction so that the ends of the shaft members are at different positions in the length direction. Therefore, in either or both of the upper chord and the lower chord in which the first shaft portion and the second shaft portion are formed, at any part in the length direction, either the shaft member of the first shaft portion or the second shaft portion extends in the length direction and serves as a through member. As a result, at any part in the length direction, the shaft member that serves as the through member can bear various stresses such as axial force, shear force, and bending force. Therefore, a structure that is strong in the length direction can be realized. To realize such a structure, the first and second axis sections can be realized by lining up the shafts in the lengthwise direction and joining them above and below, eliminating the need for a single board to realize the upper and lower chords. In addition, because this configuration allows for a strong structure as already explained, there is no need for special processing of the shafts or special joint hardware to connect the shafts together. This reduces the cost of constructing a wooden truss beam. In particular, when a wooden truss beam is to be crossed by another beam or other structure, the member of the other structure can be provided between the ends of the shaft members arranged in the lengthwise direction of the first and second shaft members, so that the member of the other structure can be provided as a through member that extends through the wooden truss beam in the crossing direction. In this way, the other structure in the crossing direction is not divided by the wooden truss beam, so that the member provided as a through member that passes through the wooden truss beam in the crossing direction can bear various stresses in the crossing direction, such as axial force, shear force, and bending force. Therefore, the structure can be made strong even in the crossing direction. In this way, a wooden truss beam can be provided that can achieve a strong structure in the longitudinal direction while reducing costs and that can cross other structures without reducing strength.

[0009] In one embodiment of the present invention, the intermediate portion of the shaft member of the first shaft section is joined to the ends of the bundle member and the diagonal member, and further comprises a flat connecting metal member, the connecting metal member having a base portion extending in the longitudinal direction and provided inside the first shaft section, and a protrusion portion provided inside each of the bundle member and the diagonal member and protruding from the base portion toward each of the bundle member and the diagonal member, and the first shaft section, the bundle member, and each of the diagonal members are rigidly connected by the connecting metal member. According to this configuration, at the portion where the ends of the bundle and diagonal members are joined to the middle portion of the shaft member of the first shaft member, the first shaft member and each of the bundle and diagonal members are rigidly joined by the joining metal fittings. Moreover, the base of the joining metal fittings is provided inside the first shaft member, and the protruding portions of the joining metal fittings are provided inside each of the bundle and diagonal members. This makes it possible to firmly join the middle portion of the shaft member of the first shaft member and the ends of the bundle and diagonal members with the joining metal fittings, while preventing the joining metal fittings from being exposed and damaging the appearance. In particular, since the diagonal member is joined not to the joint of the shaft member but to the middle section where the shaft member extends in the longitudinal direction and serves as a through member, even if the stress acting on the diagonal member acts on the first shaft section, the shaft member can effectively resist this, thereby making it possible to further increase the strength in the longitudinal direction.

[0010] In one aspect of the present invention, the diagonal members are joined by overlapping a first diagonal member and a second diagonal member in a width direction perpendicular to the length direction. According to this configuration, the first diagonal member and the second diagonal member are overlapped in the width direction, so that they are double-jointed. Therefore, after assembling the upper chord member, the lower chord member, and the bundle member, the first diagonal member and the second diagonal member can be assembled by fitting them together from the width direction, improving the ease of assembly.

[0011] In one aspect of the present invention, the ends of the shaft members aligned in the longitudinal direction are spaced apart from each other. According to this configuration, the ends of the shaft members are spaced apart from each other. This allows a member of another structure that is arranged to cross the wooden truss beam to pass between the ends of the shaft members that are spaced apart from each other. This ensures the continuity of the other structure and prevents the strength of the other structure from being reduced. Effect of the Invention

[0012] According to the present invention, it is possible to provide a wooden truss beam that can achieve a strong structure in the longitudinal direction while reducing costs and can cross other structures without reducing the reduction in strength. [Brief description of the drawings]

[0013] [Figure 1] 1 is a schematic diagram showing the arrangement of shaft members that constitute the first shaft portion of a lower chord in a truss frame having a wooden truss beam according to an embodiment of the present invention. FIG. [Diagram 2] FIG. 2 is a schematic diagram showing the arrangement of shaft members constituting the first shaft portion of the upper chord in the truss frame of FIG. 1. [Diagram 3] FIG. 2 is a diagram showing the configuration of a wooden truss beam that constitutes a first truss beam. [Figure 4] FIG. 2 is a diagram showing the configuration of a wooden truss beam that constitutes a second truss beam. [Diagram 5] FIG. 13 is a diagram showing the configuration of a wooden truss beam that constitutes a third truss beam. [Figure 6] FIG. 2 is an enlarged view showing a portion of a wooden truss beam. [Figure 7] This is an oblique development view of the joint between the shaft material, the beam material, and the diagonal material. [Figure 8] FIG. 3 is a perspective view showing the truss structure of the portion surrounded by the circles K1 and K2 in FIG. 1 and FIG. 2. [Figure 9] FIG. 2 is a cross-sectional view showing the fixing structure at the end of a wooden truss beam. [Figure 10] This is a diagram showing the assembly procedure for the truss structure, and is a plan view showing the state in which the lower chord is assembled from the center of the truss structure. [Figure 11]This is a diagram showing the state in which the second shaft portion of the lower chord is assembled. [Figure 12] This is a diagram showing the state in which the first shaft portion is assembled on the second shaft portion of the lower chord. [Figure 13] This is a diagram showing the state in which a beam is assembled on the lower chord. [Figure 14] This is a diagram showing the state in which the first axis portion of the upper chord is assembled on the beam member. [Figure 15] This is a diagram showing the state in which the second shaft portion is assembled on the first shaft portion of the upper chord member. [Figure 16] FIG. 13 is a diagram showing a modified example of a wooden truss beam according to an embodiment of the present invention. [Figure 17] FIG. 11 is a diagram showing another modified example of a wooden truss beam according to an embodiment of the present invention. [Figure 18] FIG. 11 is a diagram showing yet another modified example of the wooden truss beam according to the embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] The present invention provides a wooden truss beam, which is composed of a wooden upper chord, a lower chord, and connecting members (beam members, diagonal members) that connect the upper chord and the lower chord, and either or both of the upper chord and the lower chord are formed by arranging shaft members in the longitudinal direction, with a first shaft section and a second shaft section stacked in two rows, one above the other, and the first shaft section and the second shaft section are arranged with their joint positions offset. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, with reference to the accompanying drawings, an embodiment of a wooden truss beam according to the present invention will be described. FIG. 1 is a schematic diagram showing the arrangement of the shaft members constituting the first axis portion of the lower chord in a truss frame having a wooden truss beam according to an embodiment of the present invention. FIG. 2 is a schematic diagram showing the arrangement of the shaft members constituting the first axis portion of the upper chord in the truss frame of FIG. 1. As will be explained later using FIG. 3 and subsequent figures, in the truss frame of this embodiment, the upper chord is configured to be shorter than the lower chord. Therefore, the area of ​​the region required for the arrangement of the upper chord shown in FIG. 2 is smaller than the area of ​​the region required for the arrangement of the lower chord shown in FIG. 1. In FIG. 1, the area corresponding to FIG. 2 where the upper chord is arranged is shown surrounded by a two-dot chain line. The wooden truss beam according to this embodiment is applied to a truss structure 2 that constitutes a large roof or floor of a structure 1 such as a gymnasium or hall. In this embodiment, the truss structure 2 constitutes, for example, the roof of the structure 1. The truss structure 2 is supported from below by an outer periphery wall 4 provided along the outer periphery of the structure 1, or by a plurality of columns (not shown) arranged at intervals along the outer periphery of the structure 1. The roof of the structure 1 comprises the truss structure 2 and a roofing material (not shown) provided to cover the upper part of the truss structure 2.

[0015] In this embodiment, the truss structure 2 has, for example, a hexagonal shape in a plan view. The truss structure 2 is not limited to a hexagonal shape in a plan view, and may have other shapes, such as a rectangular shape in a plan view. The truss frame 2 has a plurality of first truss beams 10, a plurality of second truss beams 20, and a plurality of third truss beams 30. The plurality of first truss beams 10 extend in a first direction D1 in a horizontal plane. The plurality of first truss beams 10 are arranged parallel to each other at equal intervals in a first orthogonal direction D1w perpendicular to the first direction D1 in the horizontal plane. The plurality of second truss beams 20 extend in a second direction D2 intersecting with the first direction D1 in the horizontal plane. The plurality of second truss beams 20 are arranged parallel to each other at equal intervals in a second orthogonal direction D2w perpendicular to the second direction D2 in the horizontal plane. The plurality of third truss beams 30 extend in a third direction D3 intersecting with both the first direction D1 and the second direction D2 in the horizontal plane. The third truss beams 30 are arranged parallel to each other at equal intervals in a third orthogonal direction D3w that is perpendicular to the third direction D3 in a horizontal plane. In this embodiment, the first direction D1 and the second direction D2, the second direction D2 and the third direction D3, and the third direction D3 and the first direction D1 are different in angle from each other by 120° in the horizontal plane.

[0016] In this embodiment, the first truss beam 10 includes seven first truss beams 10A to 10G. Among the seven first truss beams 10A to 10G, the first truss beam 10D located at the center in the first orthogonal direction D1w has the longest beam length in the first direction D1. The first truss beam 10D is provided to connect two diagonally positioned corners C1 and C4 in the truss frame 2 having a hexagonal shape in a plan view. Of the seven first truss beams 10A to 10G, the three first truss beams 10C, 10B, and 10A arranged on one side of the first truss beam 10D in the first orthogonal direction D1w have beam lengths in the first direction D1 that gradually decrease in this order as they move away from the first truss beam 10D. Of the seven first truss beams 10A to 10G, the three first truss beams 10E, 10F, and 10G arranged on the other side of the first truss beam 10D in the first orthogonal direction D1w have beam lengths in the first direction D1 that gradually become shorter in this order as they move away from the first truss beam 10D. The first truss beams 10A, 10G located outermost in the first orthogonal direction D1w are arranged closer to the center 2c of the truss structure 2 in the first orthogonal direction D1w than the side H1 connecting corners C2 and C3 and the side H4 connecting corners C5 and C6.

[0017] In this embodiment, the second truss beams 20 include seven second truss beams 20A to 20G. Among the seven second truss beams 20A to 20G, the second truss beam 20D located at the center in the second orthogonal direction D2w has the longest beam length in the second direction D2. The second truss beam 20D is provided so as to connect two diagonally positioned corners C2 and C5 in the truss frame 2 having a hexagonal shape in a plan view. Of the seven second truss beams 20A to 20G, the three second truss beams 20C, 20B, and 20A arranged on one side of the second truss beam 20D in the second orthogonal direction D2w have beam lengths in the second direction D2 that gradually decrease in this order as they move away from the second truss beam 20D. Of the seven second truss beams 20A to 20G, the three second truss beams 20E, 20F, and 20G arranged on the other side of the second truss beam 20D in the second orthogonal direction D2w have beam lengths in the second direction D2 that gradually become shorter in this order as they move away from the second truss beam 20D. The second truss beams 20A, 20G located outermost in the second orthogonal direction D2w are arranged away from the side H2 connecting corners C3 and C4, and the side H5 connecting corners C6 and C1, in the truss structure 2, toward the center 2c of the truss structure 2 in the second orthogonal direction D2w.

[0018] In this embodiment, the third truss beams 30 include eight third truss beams 30A to 30H. Among the eight third truss beams 30A to 30H, the two third truss beams 30D and 30E located at the center in the third orthogonal direction D3w have the longest beam length in the third direction D3. The two third truss beams 30D and 30E are provided at positions offset by a predetermined dimension to one side and the other side in the third orthogonal direction D3w with respect to two diagonally positioned corners C3 and C6 in the truss frame 2 having a hexagonal shape in a plan view. Of the eight third truss beams 30A to 30H, the three third truss beams 30C, 30B, and 30A arranged on one side of the third truss beam 30D in the third orthogonal direction D3w have beam lengths that gradually become shorter in this order as they move away from the third truss beam 30D. Of the eight third truss beams 30A to 30H, the three third truss beams 30F, 30G, and 30H arranged on the other side of the third truss beam 30E in the third orthogonal direction D3w have beam lengths which become successively shorter in this order as they move away from the third truss beam 30E. As shown in Figure 2, the third truss beams 30A, 30H, which are located outermost in the third orthogonal direction D3w, have their upper chord members 110 arranged in the truss structure 2 along side H3 connecting corners C1 and C2, and side H6 connecting corners C4 and C5.

[0019] As a result, the third truss beam 30 (third truss beam 30A to 30H) is positioned offset from the intersection between the first truss beam 10 (first truss beam 10A to 10G) and the second truss beam 20 (second truss beam 20A to 20G) so as not to pass through the intersection. In the truss structure 2, a plurality of first truss beams 10 and a plurality of second truss beams 20, a plurality of second truss beams 20 and a plurality of third truss beams 30, and a plurality of third truss beams 30 and a plurality of first truss beams 10 intersect with each other. For example, the longest first truss beam 10C and the longest second truss beam 20C intersect at the center 2c of the truss structure 2. In contrast, the two longest third truss beams 30D and 30E intersect with the first truss beam 10 and the second truss beam 20 at positions shifted in the third orthogonal direction D3w with respect to the center 2c of the truss structure 2. In this way, each of the multiple third truss beams 30 intersects with the first truss beam 10 and the second truss beam 20 at a position shifted in the third orthogonal direction D3w from the position where the multiple first truss beams 10 intersect with the multiple second truss beams 20. In other words, in the truss frame 2, there is no position where all of the first truss beams 10, the second truss beams 20, and the third truss beams 30 intersect with each other.

[0020] Fig. 3 is a diagram showing the configuration of a wooden truss beam constituting a first truss beam. Fig. 4 is a diagram showing the configuration of a wooden truss beam constituting a second truss beam. Fig. 5 is a diagram showing the configuration of a wooden truss beam constituting a third truss beam. Fig. 6 is an enlarged view showing a part of a wooden truss beam. 3 to 6, each of the first truss beam 10 (for example, the first truss beam 10C), the second truss beam 20 (for example, the second truss beam 20D), and the third truss beam 30 (for example, the third truss beam 30C) is composed of a wooden truss beam 100 as shown below. The wooden truss beam 100 includes an upper chord member 110, a lower chord member 120, a beam member 130, and a diagonal member 140.

[0021] The upper chord member 110 is provided at the top of the wooden truss beam 100. The upper chord member 110 extends in the axial direction D, which is the length direction D of the wooden truss beam 100 (first direction D1 in the case of the first truss beam 10, second direction D2 in the case of the second truss beam 20, and third direction D3 in the case of the third truss beam 30). The lower chord member 120 is provided below the upper chord member 110 and spaced apart from the upper chord member 110. The lower chord member 120 extends parallel to the upper chord member 110 in the axial direction D of the wooden truss beam 100. The length of the lower chord member 120 in the axial direction D is greater than that of the upper chord member 110. In each of the first truss beam 10, the second truss beam 20, and the third truss beam 30, the length of the upper chord 110 and the lower chord 120 is set according to the length of the axial direction D of each of the first truss beam 10, the second truss beam 20, and the third truss beam 30. In addition, end diagonal members 150 are provided at both ends of the wooden truss beam 100 in the axial direction D, connecting the ends of the upper chord members 110 and the ends of the lower chord members 120.

[0022] The beams 130 are provided at equal intervals in the axial direction D of the wooden truss beam 100. The beams 130 extend in the vertical direction, and connect the upper chord 110 and the lower chord 120 in the vertical direction. The diagonal members 140 are provided between adjacent bundle members 130 in the axial direction D of the wooden truss beam 100. The diagonal members 140 extend diagonally between the upper chord member 110 and the lower chord member 120, and between the two adjacent bundle members 130. The diagonal members 140 are joined to the joints between the upper chord member 110, the lower chord member 120, and the bundle members 130. In this embodiment, the diagonal members 140 are provided so as to extend only on one of the two diagonals of the rectangular space formed by the upper chord member 110, the lower chord member 120, and the two adjacent bundle members 130. Therefore, for the bundle members 130 provided on the inside of both ends in the axial direction D, two diagonal members 140 are joined to the joints with the upper chord member 110 or the lower chord member 120 from one side and both sides in the axial direction D. With respect to the bundle 130 provided on the inside of both ends in the axial direction D, when the diagonal member 140 is joined to the joint between the bundle 130 and the upper chord member 110 on one side in the axial direction D, the diagonal member 140 is also joined to the joint between the bundle 130 and the upper chord member 110 on the other side in the axial direction D. Similarly, with respect to the bundle 130 provided on the inside of both ends in the axial direction D, when the diagonal member 140 is joined to the joint between the bundle 130 and the lower chord member 120 on one side in the axial direction D, the diagonal member 140 is also joined to the joint between the bundle 130 and the lower chord member 120 on the other side in the axial direction D. In this way, the diagonal members 140 adjacent to each other in the axial direction D of the wooden truss beam 100 have a structure in which their inclination directions are different from each other.

[0023] In each of the first truss beam 10, the second truss beam 20, and the third truss beam 30, the intervals between the bundle members 130 in the axial direction D are the same. In each of the first truss beam 10, the second truss beam 20, and the third truss beam 30, the number of the bundle members 130 is set according to the length of each of the first truss beam 10, the second truss beam 20, and the third truss beam 30 in the axial direction D.

[0024] The upper chord member 110 is made of a wooden material. The upper chord member 110 has a first axis portion 111 and a second axis portion 112. The first axis portion 111 and the second axis portion 112 each extend in the axial direction D of the wooden truss beam 100 (the first direction D1 in the case of the first truss beam 10, the second direction D2 in the case of the second truss beam 20, and the third direction D3 in the case of the third truss beam 30). The first axis portion 111 and the second axis portion 112 are stacked in the vertical direction. The first axis portion 111 is located on the side of the bundle member 130, that is, on the lower side, relative to the second axis portion 112. The second axis portion 112 is located on the opposite side of the bundle member 130, that is, on the upper side, relative to the first axis portion 111. Each of the first shaft portion 111 and the second shaft portion 112 is formed by arranging a plurality of shaft members 113, 114 in the axial direction D (length direction) of the wooden truss beam 100. Each of the shaft members 113, 114 has a predetermined length in the axial direction D (length direction) of the wooden truss beam 100. The shaft member 113 constituting the first shaft portion 111 and the shaft member 114 constituting the second shaft portion 112 have the same length. More specifically, the shaft members 113, 114 have a length substantially equal to the distance between the bundle member 130 and the bundle member 130 two adjacent to the bundle member 130. The shaft members 113, 114 are provided so that their intermediate portions 113c, 114c, more precisely, their central portions, are located above one of the bundle members 130. The shaft members 113, 114 are provided such that their ends 113s, 114s are located near the top of one of the bundle members 130 and terminate above that bundle member 130. The shaft member 114 is joined to the shaft member 113 from above by screwing in a panel screw or the like (not shown). In this way, the shaft members 113, 114 are joined to each other vertically. When viewed from above, the panel screws or the like are arranged in a staggered pattern, that is, the positions in the width direction of adjacent panel screws or the like are different from each other.

[0025] The shaft member 113 constituting the first shaft portion 111 and the shaft member 114 constituting the second shaft portion 112 are arranged with their positions shifted in the axial direction D (length direction) of the wooden truss beam 100. As shown in Fig. 6, the ends 113s on both sides in the axial direction D of the shaft member 113 constituting the first shaft portion 111 and the ends 114s on both sides in the axial direction D of the shaft member 114 constituting the second shaft portion 112 are arranged to be at different positions in the length direction. The ends 113s of the shaft members 113 adjacent to each other in the axial direction D are spaced apart from each other at the position of the middle portion 114c in the axial direction D of the shaft member 114 constituting the second shaft portion 112. As will be described in detail later, a shaft member 113 constituting the first shaft portion 111 of another wooden truss beam 100X that intersects with the wooden truss beam 100 is passed between the ends 113s of the shaft members 113 adjacent to each other in the axial direction D. Furthermore, the ends 114s of the shaft members 114 adjacent to each other in the axial direction D are spaced apart from each other at the position of the intermediate portion 113c in the axial direction D of the shaft member 113 constituting the first shaft portion 111. As will be described in detail later, a shaft member 114 constituting the second shaft portion 112 of another wooden truss beam 100X that intersects with the wooden truss beam 100 is passed between the ends 114s of the shaft members 114 adjacent to each other in the axial direction D.

[0026] In this way, each bundle 130 is configured so that, above it, there is provided one of the intermediate portions 113c, 114c, or more precisely the central portion, of the shaft material 113 constituting the first shaft portion 111 and the shaft material 114 constituting the second shaft portion 112, and the other end portion 113s, 114s. With this configuration, at any position in the axial direction D of the upper chord member 110, at least one of the shaft member 113 constituting the first shaft portion 111 and the shaft member 114 constituting the second shaft portion 112 is arranged to extend without being interrupted.

[0027] The lower chord member 120 is made of a wooden material. The lower chord member 120 includes a first shaft portion 121 and a second shaft portion 122. The first shaft portion 121 and the second shaft portion 122 each extend in the axial direction D of the wooden truss beam 100 (the first direction D1 in the case of the first truss beam 10, the second direction D2 in the case of the second truss beam 20, and the third direction D3 in the case of the third truss beam 30). The first shaft portion 121 and the second shaft portion 122 are stacked in the vertical direction. The first shaft portion 121 is located on the side of the bundle member 130, i.e., on the upper side, with respect to the second shaft portion 122. The second shaft portion 122 is located on the opposite side of the bundle member 130, i.e., on the lower side, with respect to the first shaft portion 121. Each of the first shaft portion 121 and the second shaft portion 122 is formed by arranging a plurality of shaft members 123, 124 in the axial direction D (length direction) of the wooden truss beam 100. Each of the shaft members 123, 124 has a predetermined length in the axial direction D (length direction) of the wooden truss beam 100. The shaft member 123 constituting the first shaft portion 121 and the shaft member 124 constituting the second shaft portion 122 have the same length. More specifically, the shaft members 123, 124 have a length approximately equal to the distance between the bundle member 130 and the bundle member 130 two adjacent to the bundle member 130. The shaft members 123, 124 are provided so that their intermediate portions 123c, 124c, more precisely, their central portions, are located above one of the bundle members 130. The shaft members 123, 124 are provided such that their ends 123s, 124s are located near the bottom of one of the bundle members 130 and terminate below that bundle member 130. The shaft member 124 is joined to the shaft member 123 by screwing in a panel screw (not shown) from below. In this way, the shaft members 123, 124 are joined to each other vertically. When viewed from below, the panel screws are arranged in a staggered pattern, that is, the positions in the width direction of adjacent panel screws are different from each other.

[0028] The shaft member 123 constituting the first shaft portion 121 and the shaft member 124 constituting the second shaft portion 122 are arranged with their positions shifted in the axial direction D (length direction) of the wooden truss beam 100. As shown in Fig. 6, the ends 123s on both sides in the axial direction D of the shaft member 123 constituting the first shaft portion 121 and the ends 124s on both sides in the axial direction D of the shaft member 124 constituting the second shaft portion 122 are arranged to be at different positions in the length direction. The ends 123s of the shaft members 123 adjacent to each other in the axial direction D are spaced apart from each other at the position of the middle portion 124c in the axial direction D of the shaft member 124 constituting the second shaft portion 122. As will be described in detail later, a shaft member 123 constituting the first shaft portion 121 of another wooden truss beam 100X that intersects with the wooden truss beam 100 is passed between the ends 123s of the shaft members 123 adjacent to each other in the axial direction D. Further, the ends 124s of the shaft members 124 adjacent to each other in the axial direction D are spaced apart from each other at the position of the intermediate portion 123c in the axial direction D of the shaft member 123 constituting the first shaft portion 121. As will be described in detail later, a shaft member 124 constituting the second shaft portion 122 of another wooden truss beam 100X that intersects with the wooden truss beam 100 is passed between the ends 124s of the shaft members 124 adjacent to each other in the axial direction D.

[0029] In this way, each bundle 130 is configured so that, below it, one of the intermediate portions 123c, 124c, or more precisely the central portion, of the shaft member 123 constituting the first shaft portion 121 and the shaft member 124 constituting the second shaft portion 122, and the other end portion 123s, 124s, are provided. With this configuration, at any position in the axial direction D of the lower chord 120, at least one of the shaft member 123 constituting the first shaft portion 121 and the shaft member 124 constituting the second shaft portion 122 is provided extending without being interrupted.

[0030] The shaft member 123 constituting the first shaft portion 121 of the lower chord member 120 is arranged at the same position in the axial direction D (lengthwise direction) as the shaft member 114 constituting the second shaft portion 112 of the upper chord member 110. The shaft member 124 constituting the second shaft portion 122 of the lower chord member 120 is arranged at the same position in the axial direction D (lengthwise direction) as the shaft member 113 constituting the first shaft portion 111 of the upper chord member 110.

[0031] 6, the multiple bundles 130 include a first bundle 131 and a second bundle 132. The first bundles 131 and the second bundles 132 are arranged alternately in the axial direction D. The first bundle 131 has an upper end (end) 131t joined to the middle portion 113c of the shaft 113 of the first shaft portion 111 of the upper chord 110. The lower end (end) 131b of the first bundle 131 is joined to the shaft 123 of the first shaft portion 121 of the lower chord 120 of another wooden truss beam 100X that intersects with the wooden truss beam 100. FIG. 7 is an oblique development view of the joints between the shaft member, the beam member, and the diagonal member. 6 and 7, the second bundle 132 has a lower end (end) 132b joined to a middle portion 123c in the axial direction D of the axis member 123 of the first axis portion 121 of the lower chord 120. The upper end (end) 132t of the second bundle 132 is joined to the axis member 113 of the first axis portion 111 of the upper chord 110 of another wooden truss beam 100X that intersects with the wooden truss beam 100. In this embodiment, the bundle 130 is made of a wood material. The bundle 130 may be made of a material other than wood, for example, a metal material. In this embodiment, the cross section of the bundle 130 is hexagonal. That is, the bundle 130 is in the shape of a hexagonal column extending in the vertical direction. The cross section of the bundle 130 is not limited to a hexagonal shape, and may be a circular shape, a rectangular shape, or the like.

[0032] Diagonal members 140 are provided on both sides of each bundle 130 in the axial direction D. In the bundles 130 located at both ends of the wooden truss beam 100 in the axial direction D, diagonal members 140 are provided only on one side of the bundle 130 in the axial direction D. In this embodiment, the diagonal member 140 is made of a wood material. The diagonal member 140 may be made of a material other than wood, for example, a metal material. The upper end (end) 140a of the diagonal member 140 is joined to the joint between the first bundle member 131 and the middle portion 113c of the shaft member 113 of the first shaft portion 111 of the upper chord member 110. The lower end (end) 140b of the diagonal member 140 is joined to the joint between the second bundle member 132 and the middle portion 123c of the shaft member 123 of the first shaft portion 121 of the lower chord member 120. As a result, the upper end 131t of the first bundle 131 and the upper end 140a of the diagonal member 140 are joined to the middle portion 113c of the shaft member 113 of the first shaft section 111 of the upper chord member 110. Also, the lower end 132b of the second bundle 132 and the lower end 140b of the diagonal member 140 are joined to the middle portion 123c of the shaft member 123 of the first shaft section 121 of the lower chord member 120. In this way, the upper end 140a and the lower end 140b of the diagonal member 140 are joined to the middle parts 113c, 123c of the shaft members 113, 123 constituting the first shaft parts 111, 121 of the upper chord member 110 and the lower chord member 120, and are not joined near the ends 113s, 123s. In other words, the diagonal member 140 is joined not to the part where the shaft members 113, 123 are joined, but to the part where the shaft members 113, 123 extend in the axial direction D to form a through member, so that even if the stress acting on the diagonal member 140 acts on the shaft members 113, 123, the shaft members 113, 123 can resist this.

[0033] In this embodiment, the shaft member 113, the upper end portion 131t of the first bundle member 131, and the upper end portion 140a of the diagonal member 140 are joined via a joint metal member 160A. The shaft member 123, the lower end portion 132b of the second bundle member 132, and the lower end portion 140b of the diagonal member 140 are joined via a joint metal member 160B. The joint metal member 160A and the joint metal member 160B have the same configuration except that they are upside down. 6 and 7, a notch 125 extending in the axial direction D of the shaft member 123 is formed in the middle portion 123c of the shaft member 123 of the first shaft section 121 of the lower chord member 120. The notch 125 is recessed downward from the upper surface of the shaft member 123. In addition, a slit 135B recessed upward from the lower surface of the second bundle member 132 is formed in the lower end portion 132b of the second bundle member 132. As shown in Fig. 6, a notch 115 extending in the axial direction D of the shaft member 113 is formed in the middle portion 113c of the shaft member 113 of the first shaft section 111 of the upper chord member 110. The notch 115 is recessed upward from the lower surface of the shaft member 113. In addition, a slit 135A recessed downward from the upper surface of the first bundle member 131 is formed in the upper end portion 131t of the first bundle member 131.

[0034] As shown in FIG. 7, in this embodiment, the diagonal member 140 includes a first diagonal member 141, a second diagonal member 142, and a spacer 143. The first diagonal member 141 and the second diagonal member 142 are arranged at an interval in the axial direction D and the width direction intersecting the vertical direction. The spacer 143 is made of, for example, a rubber-based material, a metal material, a resin material, or the like, and has a predetermined thickness in the width direction. The spacer 143 is provided only in the middle part of the diagonal member 140 in the extension direction. As a result, as shown in FIG. 6 and FIG. 7, gaps 144A and 144B corresponding to the thickness of the spacer 143 are formed between the first diagonal member 141 and the second diagonal member 142 at the upper end 140a and the lower end 140b of the diagonal member 140, respectively.

[0035] 6 and 7, the joint metal members 160A and 160B are made of, for example, a metal plate, and integrally have a base portion 161 and protruding portions 162 and 163. The base portion 161 extends in the axial direction D of the shaft members 113 and 123, and is inserted into the notches 115 and 125. The extension portion 162 is provided so as to extend from the base portion 161 toward the bundle material 130 (first bundle material 131, second bundle material 132). The extension portion 162 is inserted into the slits 135A and 135B of the bundle material 130. The overhanging portion 163 is provided so as to overhang obliquely from the base portion 161 toward the diagonal member 140. The overhanging portion 163 is inserted into the gaps 144A and 144B of the diagonal member 140. Such joint metal fittings 160A and 160B are joined to the shaft members 113 and 123, the first bundling member 131, the second bundling member 132, and the diagonal member 140 by drift pins (not shown) or the like. The first shaft portions 111 and 121 are rigidly joined to the bundling member 130 and the diagonal member 140 by such joint metal fittings 160A and 160B.

[0036] In FIG. 6, another wooden truss beam 100X is provided so as to cross the wooden truss beam 100 and extend in a direction crossing the paper. When the wooden truss beam 100 shown in FIG. 6 constitutes the first truss beam 10, the other wooden truss beam 100X provided so as to cross may constitute the second truss beam 20 or the third truss beam 30, as will be described later with reference to FIG. 8. Similarly, when the wooden truss beam 100 shown in FIG. 6 constitutes the second truss beam 20, the other wooden truss beam 100X provided so as to cross may constitute the third truss beam 30 or the first truss beam 10. Alternatively, when the wooden truss beam 100 shown in FIG. 6 constitutes the third truss beam 30, the other wooden truss beam 100X provided so as to cross may constitute the first truss beam 10 or the second truss beam 20. As will be described in detail later, the bundle 130 of the wooden truss beam 100 is also used as the bundle 130 in other wooden truss beams 100X that intersect with it. Therefore, in each bundle 130, a diagonal member 140 (not shown in FIG. 6) of the other wooden truss beam 100X is joined from a direction intersecting the paper surface.

[0037] For example, in the first bundle 131 in FIG. 6, the shaft member 123 of the first axis portion 121 of the lower chord member 120 of another wooden truss beam 100X is provided below it so as to extend in a direction intersecting the paper surface to become a through member, and the lower end portion 131b of the first bundle 131 is joined to the middle portion 123c of this shaft member 123. Therefore, the diagonal member 140 of the other wooden truss beam 100X is joined to the lower end portion 131b of the first bundle 131 from a direction intersecting the paper surface. Therefore, at the lower end portion 131b of the first bundle 131, the joint metal 160B that joins the shaft member 123 of the first axis portion 121 of the lower chord member 120 of the other wooden truss beam 100X, the first bundle 131, and the diagonal member 140 is provided so as to extend in a direction intersecting the paper surface. The first beam 131 of the wooden truss beam 100 is joined to the lower chord 120 by this metal joint 160B. 6, the shaft member 113 of the first axis portion 111 of the upper chord member 110 of the other wooden truss beam 100X is provided below it so as to extend in a direction intersecting the paper plane and become a through member, and the upper end portion 132t of the second bundle member 132 is joined to the middle portion 113c of this shaft member 113. Therefore, the diagonal member 140 of the other wooden truss beam 100X is joined to the upper end portion 132t of the second bundle member 132 from a direction intersecting the paper plane. Therefore, at the upper end portion 131t of the second bundle member 132, the joint metal 160A that joins the shaft member 113 of the first axis portion 111 of the upper chord member 110 of the other wooden truss beam 100X, the second bundle member 132, and the diagonal member 140 is provided so as to extend in a direction intersecting the paper plane. The second beam 132 of the wooden truss beam 100 is joined to the upper chord 110 by this metal joint 160A.

[0038] FIG. 8 is a perspective view showing the truss structure 2 of the portions surrounded by circles K1 and K2 in FIG. 1 and FIG. As shown in FIG. 8, the first truss beam 10 and the second truss beam 20 intersect at a position J1, the second truss beam 20 intersects at a position J2, and the first truss beam 10 intersects at a position J3. That is, the first truss beam 10 and the second truss beam 20 share one bundle 130A, and are provided to intersect at the position J1 of the one bundle 130A. The second truss beam 20 and the third truss beam 30 share a second bundle 130B, and are provided to intersect at the position J2 of the second bundle 130B. The third truss beam 30 and the first truss beam 10 share a third bundle 130C, and are provided to intersect at the position J3 of the third bundle 130C.

[0039] At position J1 where the first truss beam 10 and the second truss beam 20 intersect, the upper end of one beam 130A is joined to the middle part of the first axis portion 111 of the upper chord 110 of the wooden truss beam 100 that constitutes the first truss beam 10 via a connecting metal member 160A (see Figure 6). At position J1 of one beam 130A, the axis member 113 that constitutes the first axis portion 111 of the upper chord member 110 of the wooden truss beam 100 that constitutes the first truss beam 10 and the axis member 114 that constitutes the second axis portion 112 of the upper chord member 110 of the wooden truss beam 100 that constitutes the second truss beam 20 are arranged to intersect at their respective midpoints when viewed in a plane. At position J1, the end 114s of the axis member 114 constituting the second axis portion 112 of the upper chord member 110 of the first truss beam 10 is provided opposite the side surface 114f of the axis member 114 constituting the second axis portion 112 of the upper chord member 110 of the second truss beam 20. At position J1, the end 113s of the axis member 113 constituting the first axis portion 111 of the upper chord member 110 of the second truss beam 20 is provided opposite the side surface 113f of the axis member 113 constituting the first axis portion 111 of the upper chord member 110 of the first truss beam 10.

[0040] At position J1 where the first truss beam 10 and the second truss beam 20 intersect, the lower end of one beam 130A is joined to the middle part of the first axis portion 121 of the lower chord 120 of the wooden truss beam 100 that constitutes the second truss beam 20 via a connecting metal fitting 160B (see Figures 6 and 7). At position J1 of one beam 130A, the axis member 124 constituting the second axis portion 122 of the lower chord member 120 of the wooden truss beam 100 constituting the first truss beam 10 and the axis member 123 constituting the first axis portion 121 of the lower chord member 120 of the wooden truss beam 100 constituting the second truss beam 20 are arranged to intersect at their respective midpoints when viewed in a plane. At position J1, an end 123s of the shaft member 123 constituting the first axis portion 121 of the lower chord member 120 of the first truss beam 10 is provided opposite a side surface 123f of the shaft member 123 constituting the first axis portion 121 of the lower chord member 120 of the second truss beam 20. At position J1, an end 124s of the shaft member 124 constituting the second axis portion 122 of the lower chord member 120 of the second truss beam 20 is provided opposite a side surface 124f of the shaft member 124 constituting the second axis portion 122 of the lower chord member 120 of the first truss beam 10.

[0041] At position J2 where the second truss beam 20 and the third truss beam 30 intersect, the upper end of the second beam 130B is joined to the middle part of the first axis portion 111 of the upper chord member 110 of the wooden truss beam 100 that constitutes the second truss beam 20 via a connecting metal member 160A (see Figure 6). At position J2 of the second beam 130B, the axis member 113 constituting the first axis portion 111 of the upper chord member 110 of the wooden truss beam 100 constituting the second truss beam 20 and the axis member 114 constituting the second axis portion 112 of the upper chord member 110 of the wooden truss beam 100 constituting the third truss beam 30 are arranged to intersect at their respective midpoints when viewed in a plane. At position J2, the end 114s of the axis member 114 constituting the second axis portion 112 of the upper chord member 110 of the second truss beam 20 is provided opposite the side surface 114f of the axis member 114 constituting the second axis portion 112 of the upper chord member 110 of the third truss beam 30. At position J2, the end 113s of the axis member 113 constituting the first axis portion 111 of the upper chord member 110 of the third truss beam 30 is provided opposite the side surface 113f of the axis member 113 constituting the first axis portion 111 of the upper chord member 110 of the second truss beam 20.

[0042] At position J2 where the second truss beam 20 and the third truss beam 30 intersect, the lower end of the second beam 130B is joined to the middle part of the first axis portion 121 of the lower chord member 120 of the wooden truss beam 100 that constitutes the third truss beam 30 via a connecting metal member 160B (see Figures 6 and 7). At position J2 of the second beam 130B, the axis member 124 constituting the second axis portion 122 of the lower chord member 120 of the wooden truss beam 100 constituting the second truss beam 20 and the axis member 123 constituting the first axis portion 121 of the lower chord member 120 of the wooden truss beam 100 constituting the third truss beam 30 are arranged to intersect at their respective midpoints when viewed in a plane. At position J2, an end 123s of the shaft member 123 constituting the first axis portion 121 of the lower chord member 120 of the second truss beam 20 is provided opposite a side surface 123f of the shaft member 123 constituting the first axis portion 121 of the lower chord member 120 of the third truss beam 30. At position J2, an end 124s of the shaft member 124 constituting the second axis portion 122 of the lower chord member 120 of the third truss beam 30 is provided opposite a side surface 124f of the shaft member 124 constituting the second axis portion 122 of the lower chord member 120 of the second truss beam 20.

[0043] At position J3 where the third truss beam 30 and the first truss beam 10 intersect, the upper end of the third beam 130C is joined to the middle part of the first axis portion 111 of the upper chord 110 of the wooden truss beam 100 that constitutes the third truss beam 30 via a connecting metal fitting 160A (see Figure 6). At position J3 of the third beam 130C, the axis member 113 that constitutes the first axis portion 111 of the upper chord member 110 of the wooden truss beam 100 that constitutes the third truss beam 30 and the axis member 114 that constitutes the second axis portion 112 of the upper chord member 110 of the wooden truss beam 100 that constitutes the first truss beam 10 are arranged to intersect at their respective midpoints when viewed in a plane. At position J3, the end 114s of the axis member 114 constituting the second axis portion 112 of the upper chord member 110 of the third truss beam 30 is provided opposite the side surface 114f of the axis member 114 constituting the second axis portion 112 of the upper chord member 110 of the first truss beam 10. At position J3, the end 113s of the axis member 113 constituting the first axis portion 111 of the upper chord member 110 of the first truss beam 10 is provided opposite the side surface 113f of the axis member 113 constituting the first axis portion 111 of the upper chord member 110 of the third truss beam 30.

[0044] At position J3 where the third truss beam 30 and the first truss beam 10 intersect, the lower end of the third beam 130C is joined to the middle part of the first axis portion 121 of the lower chord 120 of the wooden truss beam 100 that constitutes the first truss beam 10 via a connecting metal fitting 160B (see Figures 6 and 7). At position J3 of the third beam member 130C, the axis member 124 constituting the second axis portion 122 of the lower chord member 120 of the wooden truss beam 100 constituting the third truss beam 30 and the axis member 123 constituting the first axis portion 121 of the lower chord member 120 of the wooden truss beam 100 constituting the first truss beam 10 are arranged to intersect at their respective midpoints when viewed in a plane. At position J3, the end 123s of the shaft member 123 constituting the first axis portion 121 of the lower chord member 120 of the third truss beam 30 is provided opposite to the side surface 123f of the shaft member 123 constituting the first axis portion 121 of the lower chord member 120 of the first truss beam 10. At position J3, the end 124s of the shaft member 124 constituting the second axis portion 122 of the lower chord member 120 of the first truss beam 10 is provided opposite to the side surface 124f of the shaft member 124 constituting the second axis portion 122 of the lower chord member 120 of the third truss beam 30.

[0045] FIG. 9 is a cross-sectional view showing a fixing structure at the end of a wooden truss beam. In each of the first truss beam 10, the second truss beam 20, and the third truss beam 30, the end 100e in the axial direction D of each wooden truss beam 100 is joined to the outer peripheral wall 4 provided on the outer periphery of the structure 1 via a joining member 70 and an anchor member 80. The joining member 70 integrally includes a base plate 71 provided along the upper surface of the outer peripheral wall 4 and a rising plate 72 rising upward from the upper surface of the base plate 71. The base plate 71 is provided on the upper surface of the outer peripheral wall 4 via mortar 73 of a predetermined thickness. An upper end 80t of an anchor member 80 embedded in the outer peripheral wall 4 is fixed to the base plate 71. The rising plate 72 has, integrally at the end 100e of the wooden truss beam 100, a portion 72a which is pin-joined to the end of the lower chord 120 in the axial direction D using a drift pin or the like, and a portion 72b which is pin-joined to the lower end of the end diagonal member 150 using a drift pin or the like.

[0046] Fig. 10 is a diagram showing the assembly procedure of a truss frame, and is a plan view showing the state where the lower chord is assembled from the center of the truss frame. Fig. 11 is a diagram showing the state where the second axis part of the lower chord is assembled. Fig. 12 is a diagram showing the state where the first axis part is assembled on the second axis part of the lower chord. Fig. 13 is a diagram showing the state where a beam is assembled on the lower chord. Fig. 14 is a diagram showing the state where the first axis part of the upper chord is assembled on the beam. Fig. 15 is a diagram showing the state where the second axis part is assembled on the first axis part of the upper chord. To assemble the truss structure 2 using the wooden truss beams 100 as described above, for example, the components of the wooden truss beams 100 constituting the first truss beam 10, the second truss beam 20, and the third truss beam 30 are sequentially assembled as follows. First, on a plurality of supports (not shown) installed on the floor surface of the construction site of the structure 1, a plurality of shaft members 124 constituting the second shaft portion 122 of the lower chord member 120 of the wooden truss beam 100 are arranged in each of the first truss beam 10, the second truss beam 20, and the third truss beam 30, as shown in Figures 10 and 11. At this time, the plurality of shaft members 124 may be arranged, for example, sequentially from the center 2c of the truss frame 2 to be formed toward the outside. Next, as shown in Figure 12, in each of the first truss beam 10, the second truss beam 20, and the third truss beam 30, multiple shaft members 123 of the first axis portion 121 of the lower chord member 120 of the wooden truss beam 100 are assembled onto the shaft member 124 (the second axis portion 122 of the lower chord member 120).

[0047] Next, as shown in FIG. 13, in each of the first truss beam 10, the second truss beam 20, and the third truss beam 30, a plurality of beams 130 are assembled on the shaft member 123 of the first shaft portion 121 of the lower chord member 120 of the wooden truss beam 100. Next, as shown in Figure 14, in each of the first truss beam 10, the second truss beam 20, and the third truss beam 30, multiple shaft members 113 of the first shaft portion 111 of the upper chord member 110 of the wooden truss beam 100 are assembled on multiple bundle members 130 of the wooden truss beam 100. Furthermore, as shown in Figure 15, in each of the first truss beam 10, the second truss beam 20, and the third truss beam 30, a plurality of shaft members 114 constituting the second axis portion 112 of the upper chord member 110 are assembled on a plurality of shaft members 113 of the first axis portion 111 of the wooden truss beam 100.

[0048] Then, as shown in Figs. 3 to 5, in each of the first truss beam 10, the second truss beam 20, and the third truss beam 30, the diagonal members 140 are respectively assembled between the upper chord member 110 and the lower chord member 120 of the wooden truss beam 100, between the adjacent bundle members 130 in the axial direction D. The diagonal members 140 are so-called two-piece joints in which the first diagonal member 141 and the second diagonal member 142 are overlapped in the width direction, so that they can be assembled by fitting them in from the width direction after assembling the upper chord member 110, the lower chord member 120, and the bundle member 130. At this time, in order to easily incorporate the diagonal members 140, it is preferable to take care to absorb construction errors, such as by drilling drift pin holes as adjustment allowances after actual measurement on site.

[0049] According to the above-mentioned wooden truss beam 100, which forms the roof or floor of the structure 1, the wooden truss beam 100 includes wooden upper chord members 110 and lower chord members 120, and bundle members 130 and diagonal members 140 that connect the upper chord members 110 and lower chord members 120 in the vertical direction and the diagonal direction, respectively. Both the upper chord member 110 and the lower chord member 120 include first shaft portions 111, 121 and second shaft portions 112, 122 that are formed by arranging shaft members 113, 114, 123, 124 in the longitudinal direction (axial direction) D. The first shaft portions 111, 121 and the second shaft portions 112, 122 are arranged such that the first shaft portions 111, 121 are connected to the second shaft portions 112, 12 2, and in both the upper chord member 110 and the lower chord member 120, the first shaft portions 111, 121 and the second shaft portions 112, 122 are arranged side by side, one above the other, so that the ends 113s, 123s of the shaft portions 113, 123 of the first shaft portions 111, 121 and the ends 114s, 124s of the shaft portions 114, 124 of the second shaft portions 112, 122 are at different positions in the longitudinal direction D, and the shaft portions 113, 123 of the first shaft portions 111, 121 and the shaft portions 114, 124 of the second shaft portions 112, 122 are joined vertically. According to the above-mentioned configuration, both the upper chord 110 and the lower chord 120 of the wooden truss beam 100 are constructed by arranging the shaft members 113, 114, 123, 124 in the longitudinal direction D to form the first shaft sections 111, 121 and the second shaft sections 112, 122, arranging them vertically, and joining the shaft members 113, 114, 123, 124 vertically. Here, the first shaft sections 111, 121 and the second shaft sections 112, 122 are arranged with the shaft members 113, 114, 123, 124 shifted in the longitudinal direction D so that the ends 113s, 114s, 123s, 124s of the shaft members 113, 114, 123, 124 are at different positions in the longitudinal direction D. For this reason, in both the upper chord member 110 and the lower chord member 120 in which the first shaft portions 111, 121 and the second shaft portions 112, 122 are formed, the shaft portions 113, 114, 123, 124 of either the first shaft portions 111, 121 or the second shaft portions 112, 122 extend in the longitudinal direction D and serve as through members at any portion in the longitudinal direction D. As a result, the shaft portions 113, 114, 123, 124 serving as through members can bear various stresses, such as axial force, shear force, and bending force, at any portion in the longitudinal direction D. Therefore, a strong structure can be realized in the longitudinal direction D. To realize such a structure, the shaft members 113, 114, 123, 124 are arranged in the length direction D and joined vertically to each other to realize the first shaft portions 111, 121 and the second shaft portions 112, 122, so that a single board is not required to realize the upper chord member 110 and the lower chord member 120. In addition, since such a configuration can realize a strong structure as already explained, special processing of the shaft members 113, 114, 123, 124 or special metal fittings are not required to connect the shaft members 113, 114, 123, 124 to each other. This allows the cost of constructing the wooden truss beam 100 to be reduced. In particular, when the wooden truss beam 100 is crossed with another beam or other structure (another wooden truss beam) 100X, the members of the other structure 100X can be provided between the ends 113s, 114s, 123s, 124s of the shaft members 113, 114, 123, 124 arranged in the length direction D by the first shaft portion 111, 121 and the second shaft portion 112, 122, so that the members of the other structure 100X become through members extending in the crossing direction through the wooden truss beam 100. In this way, the other structure 100X in the crossing direction is not divided by the wooden truss beam 100, so that the members provided as through members that penetrate the wooden truss beam 100 in the crossing direction can bear various stresses such as axial force, shear force, and bending force in the crossing direction. Therefore, the structure can be made strong even in the crossing direction. In this way, a wooden truss beam 100 can be provided that can reduce costs, achieve a strong structure in the longitudinal direction D, and enable other structures 100X to be crossed while minimizing a reduction in strength.

[0050] In addition, the ends 131t, 132t, 131b, 132b, 140a, 140b of the bundle 130 and the diagonal member 140 are joined to the intermediate portions 113c, 123c of the shaft members 113, 123 of the first shaft portions 111, 121, and further include flat joint metal members 160A, 160B. The joint metal members 160A, 160B extend in the length direction D and connect the first shaft portions 111, 121. The first shaft portion 111, 121 has a base 161 provided inside the bundle 130 and a diagonal member 140, and protrusions 162, 163 provided inside the bundle 130 and the diagonal member 140, respectively, and protrude from the base 161 toward the bundle 130 and the diagonal member 140, and the first shaft portions 111, 121 and the bundle 130 and the diagonal member 140 are rigidly joined by connecting metal fittings 160A, 160B. According to this configuration, at the portions where the ends 131t, 132t, 131b, 132b, 140a, 140b of the bundle 130 and the diagonal member 140 are joined to the intermediate portions 113c, 123c of the shaft members 113, 123 of the first shaft members 111, 121, the first shaft members 111, 121 and the bundle 130 and the diagonal member 140 are rigidly joined by the joining metal members 160A, 160B. The bases 161 of the joining metal members 160A, 160B are provided inside the first shaft members 111, 121, and the protruding portions 162, 163 of the joining metal members 160A, 160B are provided inside the bundle 130 and the diagonal member 140, respectively. This allows the intermediate portions 113c, 123c of the shaft members 113, 123 of the first shaft portions 111, 121 and the ends 131t, 132t, 131b, 132b, 140a, 140b of the bundle member 130 and the diagonal member 140 to be firmly joined by the joining metal fittings 160A, 160B, while preventing the joining metal fittings 160A, 160B from being exposed and damaging the appearance. In particular, since the diagonal member 140 is joined not to the portion where the shaft members 113, 123 are joined, but to the intermediate portions 113c, 123c where the shaft members 113, 123 extend in the length direction D and serve as through members, even if the stress acting on the diagonal member 140 acts on the first shaft portions 111, 121, the shaft members 113, 123 can efficiently resist this. Therefore, the strength in the length direction D can be made stronger.

[0051] In addition, the diagonal member 140 is formed by overlapping and joining a first diagonal member 141 and a second diagonal member 142 in the width direction perpendicular to the length direction D. According to this configuration, the diagonal member 140 is a so-called two-piece joint in which the first diagonal member 141 and the second diagonal member 142 are overlapped in the width direction. Therefore, after assembling the upper chord member 110, the lower chord member 120, and the bundle member 130, the first diagonal member 141 and the second diagonal member 142 can be assembled by fitting them together from the width direction, improving the ease of assembly.

[0052] Moreover, the shaft members 113, 114, 123, and 124 arranged in the longitudinal direction D are provided such that their end portions 113s, 114s, 123s, and 124s are spaced apart from each other. According to this configuration, the ends 113s, 114s, 123s, and 124s of the shaft members 113, 114, 123, and 124 are spaced apart from each other. This allows members of other structures (e.g., shaft members 113, 114, 123, and 124 of another wooden truss beam 100X) that are arranged to intersect with the wooden truss beam 100 to pass between the ends 113s, 114s, 123s, and 124s of the shaft members 113, 114, 123, and 124 that are spaced apart from each other. This ensures the continuity of the other structures and prevents the strength of the other structures from being reduced.

[0053] (Other variations) The wooden truss beam of the present invention is not limited to the above-described embodiment explained with reference to the drawings, and various modifications are possible within the technical scope. For example, in the above embodiment, the wooden truss beam 100 constituting the truss structure 2 is illustrated, but the configuration can be changed as appropriate. For example, as shown in FIG. 16, a wooden truss beam 100B may have a Howe truss structure in which the diagonal members 140B are arranged differently. Also, as shown in FIG. 17, a wooden truss beam 100C may have a Pratt truss structure in which the diagonal members 140C are arranged differently. Also, as shown in FIG. 17, a wooden truss beam 100D may have a curved chord Pratt truss structure in which the shape of the upper chord member 110D is different.

[0054] In addition, in the above embodiment, the truss structure 2 is configured to include a first truss beam 10 extending in the first direction D1, a second truss beam 20 extending in the second direction D2, and a third truss beam 30 extending in the third direction D3, but this is not limited to this. For example, the truss structure 2 may include only a first truss beam 10 extending in a first direction D1 and a second truss beam 20 extending in a second direction D2. In this case, the first direction D1 in which the first truss beam 10 extends and the second direction D2 in which the second truss beam 20 extends may be perpendicular to each other.

[0055] In the above embodiment, the first truss beam 10 and the second truss beam 20, the second truss beam 20 and the third truss beam 30, and the third truss beam 30 and the first truss beam 10, each of which is made of the wooden truss beam 100, intersect with each other, but this is not limited to the above. The present invention is also applicable to cases in which the first truss beam 10, the second truss beam 20, and the third truss beam 30, each of which is made of the wooden truss beam 100, intersect with other beam materials. Furthermore, the wooden truss beam 100 can be used for various purposes other than forming the truss frame 2 as shown in the above embodiment.

[0056] In addition, in the above embodiment, both the upper chord member 110 and the lower chord member 120 were configured to have first shaft portions 111, 121 and second shaft portions 112, 122 formed by arranging shaft members 113, 114, 123, 124 in the longitudinal direction (axial direction) D, but this is not limited to this, and either the upper chord member 110 or the lower chord member 120 may be configured to have first shaft portions 111, 121 and second shaft portions 112, 122 formed by arranging shaft members 113, 114, 123, 124 in the longitudinal direction (axial direction) D. That is, the wooden truss beam 100 forming the roof or floor of the structure 1 comprises wooden upper chord member 110 and lower chord member 120, as well as beam members 130 and diagonal members 140 that connect the upper chord member 110 and the lower chord member 120 in the vertical direction and the diagonal direction, respectively. The upper chord member 110 comprises a first shaft portion 111 and a second shaft portion 112 each formed by arranging shaft members 113 and 114 in the longitudinal direction (axial direction) D. The first shaft portion 111 and the second shaft portion 112 are connected to each other by the first shaft portion 111. The first shaft portion 111 and the second shaft portion 112 may be arranged side by side, one above the other, so that the end 113s of the shaft member 113 of the first shaft portion 111 and the end 114s of the shaft member 114 of the second shaft portion 112 are at different positions in the longitudinal direction D, and the shaft member 113 of the first shaft portion 111 and the shaft member 114 of the second shaft portion 112 may be joined vertically. Alternatively, a wooden truss beam 100 forming a roof or floor of a structure 1 includes a wooden upper chord member 110 and a lower chord member 120, and beam members 130 and diagonal members 140 that connect the upper chord member 110 and the lower chord member 120 in the vertical direction and the diagonal direction, respectively. The lower chord member 120 includes a first shaft portion 121 and a second shaft portion 122 each formed by arranging shaft members 123, 124 in the length direction (axial direction) D. The first shaft portion 121 and the second shaft portion 122 are connected to each other by a first shaft portion 121. The first shaft portion 121 and the second shaft portion 122 may be arranged side by side, one above the other, so that the end 123s of the shaft member 123 of the first shaft portion 121 and the end 124s of the shaft member 124 of the second shaft portion 122 are at different positions in the longitudinal direction D, and the shaft member 123 of the first shaft portion 121 and the shaft member 124 of the second shaft portion 122 may be joined vertically. In addition, the configurations described in the above embodiments can be selected or changed as appropriate without departing from the spirit of the present invention. [Explanation of symbols]

[0057] 1 Structure 140, 140B, 140C Diagonal members 100, 100B~100D Wooden truss beam 140a Upper end (end) of diagonal member 110, 110D Upper chord 140b Lower end of diagonal member (end) 120 Lower chord 141 First diagonal 111, 121 1st shaft part 142 2nd diagonal member 113, 123 Shaft material of first shaft section 160A, 160B Joint metal fittings 113s, 123s End of shaft member of first shaft portion 161 Base 113c, 123c: Middle portion of shaft member of first shaft portion 162, 163: Extension portion 112, 122 Second shaft part D Axial direction (length direction) 114, 124 Shaft material of the second shaft 130, 130A~130C bundle material 131t, 132t Upper end of bundle (end) 131b, 132b Lower end (end) of bundle

Claims

1. A wooden truss beam forming a roof or floor of a structure, The structure comprises an upper chord and a lower chord made of wood, and a beam and a diagonal member that connect the upper chord and the lower chord in the vertical direction and the diagonal direction, respectively; Either or both of the upper chord member and the lower chord member have a first shaft portion and a second shaft portion formed by arranging shaft members in the longitudinal direction, and the first shaft portion and the second shaft portion are arranged vertically side by side so that the first shaft portion is located closer to the bundle member than the second shaft portion, A wooden truss beam characterized in that the first and second shaft portions are arranged with the shaft members shifted in the longitudinal direction so that the ends of the shaft members are at different positions in the longitudinal direction, and the shaft members are joined together above and below.

2. The ends of the bundle and the diagonal member are joined to the middle portion of the shaft member of the first shaft portion, The joint further includes a flat metal joint, the metal joint including a base extending in the longitudinal direction and provided inside the first shaft portion, and a protruding portion provided inside each of the bundle and the diagonal member, the protruding portion being provided so as to protrude from the base toward each of the bundle and the diagonal member, The wooden truss beam according to claim 1, characterized in that the first axis portion, the beam member, and the diagonal member are rigidly connected to each other by the metal joint.

3. The wooden truss beam according to claim 1 or 2, characterized in that the diagonal members are formed by overlapping and joining a first diagonal member and a second diagonal member in a width direction perpendicular to the length direction.

4. 3. The wooden truss beam according to claim 1, wherein the ends of the shaft members arranged in the longitudinal direction are spaced apart from each other.

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