Structural materials and structures

Abstract

An object of the present invention is to provide a structural material and a structure that can be easily manufactured at low cost by using conventional square bars, can be easily manufactured in various dimensions, and can obtain strength. 【Solution means】The structural material 100 is a structural material 100 formed by connecting a plurality of long square bars 1 with a connecting fitting M. The connecting fitting M includes a male fitting 4 and a female fitting 6 that can engage with each other. One square bar 1a and the other square bar 1b are arranged with their longitudinal side surfaces 11 facing each other. Among the longitudinal side surfaces 11 of one square bar 1a, a male fitting 4 is provided extending in the longitudinal direction on the opposing surface to the other square bar 1b. Among the longitudinal side surfaces 11 of the other square bar 1b, a female fitting 6 is provided extending in the longitudinal direction on the opposing surface to the one square bar 1a. By engaging the male fitting 4 and the female fitting 6, the longitudinal side surface 11 of one square bar 1a and the longitudinal side surface 11 of the other square bar 1b are connected.

Description

Technical Field

[0001] The present invention relates to structural materials and structures.

Background Art

[0002] Recently, glued laminated timber has been used for structural materials such as columns and beams in wooden buildings, or for internal structures such as structures. Such glued laminated timber is formed as a square timber or thick board by, for example, laminating and bonding laminas (sawn boards) or small square timbers obtained by cutting logs from mountains so that the fiber directions are substantially parallel to each other in the thickness, width, and length directions. Although glued laminated timber is generally more costly than non-glued timber depending on the type of log, it is beneficial in terms of effective utilization of resources and is widely used. However, in glued laminated timber, although one of the length or cross-sectional area can be increased, it has been difficult to increase both the length and cross-sectional area in terms of material procurement.

[0003] On the other hand, as a new building material for structures, the use of CLT (Cross Laminated Timber) has been proposed. CLT is a panel in which a plurality of lamina layers are laminated and bonded so that the fiber directions are orthogonal to each other. However, CLT is very large and not very user-friendly, and is not currently widely distributed.

[0004] In Patent Document 1, for example, a plurality of reinforcing plates made of cellulose nanofibers are assembled in a grid shape to form a reinforcing member, and a plurality of column members are arranged between the grid-shaped reinforcing members to form one column in an assembled state. The column members use wood materials such as CLT, LVL (Laminated Veneer Lumber), and glued laminated timber. In the technology described in the above Patent Document 1, the cross-sectional area of the entire column is increased by arranging a plurality of column members between the reinforcing members. However, when further increasing the cross-sectional area of the entire column, it was necessary to separately change the sizes of the reinforcing members and the column members according to the cross-sectional area. Therefore, it was not possible to easily increase the cross-sectional area of the entire column, and the construction work was complicated.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] The present invention has been made in view of the above circumstances, and an object thereof is to provide a structural material and a structure that can be easily manufactured at low cost by using conventional angle bars, can be easily manufactured in various dimensions, and can obtain strength.

Means for Solving the Problems

[0007] The invention according to claim 1 is, for example, as shown in FIGS. 1 to 3, a structural material 100 formed by connecting a plurality of long angle bars 1 with a connecting fitting M, wherein the connecting fitting M includes a male fitting 4 and a female fitting 6 that can engage with each other, one angle bar 1a and the other angle bar 1b are arranged with their longitudinal side surfaces 11 facing each other, the male fitting 4 is provided to extend in the longitudinal direction on the opposing surface of the longitudinal side surface 11 of the one angle bar 1a with respect to the other angle bar 1b, the female fitting 6 is provided to extend in the longitudinal direction on the opposing surface of the longitudinal side surface 11 of the other angle bar 1b with respect to the one angle bar 1a, and The male fitting 4 and the female fitting 6 are engaged with each other, whereby the longitudinal side surface 11 of the one square bar 1a and the longitudinal side surface 11 of the other square bar 1b are connected.

[0008] According to the invention described in claim 1, there is provided a structural member 100 formed by connecting a plurality of long square bars 1 with a connecting fitting M. The connecting fitting M includes a male fitting 4 and a female fitting 6 that can be engaged with each other. One square bar 1a and the other square bar 1b are arranged with their longitudinal side surfaces 11 facing each other. On the opposing surface of the longitudinal side surface 11 of one square bar 1a with respect to the other square bar 1b, the male fitting 4 is provided to extend in the longitudinal direction. On the opposing surface of the longitudinal side surface 11 of the other square bar 1b with respect to one square bar 1a, the female fitting 6 is provided to extend in the longitudinal direction. By engaging the male fitting 4 and the female fitting 6 with each other, the longitudinal side surface 11 of one square bar 1a and the longitudinal side surface 11 of the other square bar 1b are connected. Therefore, by engaging the male fitting 4 of one square bar 1a and the female fitting 6 of the other square bar 1b with each other, the longitudinal side surface 11 of one square bar 1a and the other square bar 1b can be easily connected along the longitudinal side surface 11. Therefore, for example, by using a conventional square bar as the square bar 1 and connecting it with the male fitting 4 and the female fitting 6, material procurement is easy and it can be manufactured at low cost. Also, by appropriately changing the number of the square bars 1, the cross-sectional area of the structural member 100 can be easily changed, and the structural member 100 with various dimensions can be obtained. Moreover, since it is connected by the male fitting 4 and the female fitting 6, the structural member 100 with excellent strength can be obtained. Furthermore, by appropriately changing the material of the square bar 1, the strength of the structural member 100 can also be freely changed, increasing the range of applications.

[0009] The invention described in claim 2 is, for example, as shown in FIG. 1, in the structural member 100 described in claim 1, The longitudinal end of the male fitting or the longitudinal end of the female fitting 6 extends from the longitudinal end face 12 of the square bar 1.

[0010] According to the invention described in claim 2, since the longitudinal end portion of the male fitting or the longitudinal end portion of the female fitting 6 extends from the longitudinal end face 12 of the square bar 1, it is possible to easily connect to the longitudinal end face of another square bar using this extended male fitting or female fitting 6. Therefore, by changing the number of square bars 1 connected in the longitudinal direction, the longitudinal dimension of the structural member 100 can be easily changed, and structural members 100 of various dimensions can be obtained. Also, a structural member 100 with excellent strength can be obtained.

[0011] The invention described in claim 3 is, for example, as shown in FIGS. 16 and 17, in the structural member 300 described in claim 1, characterized in that the male fitting 4A or the female fitting 6A is further provided on the longitudinal end face 92 of the square bar 9 so as to extend in a direction perpendicular to the longitudinal direction.

[0012] According to the invention described in claim 3, since the male fitting 4A or the female fitting 6A is further provided on the longitudinal end face 92 of the square bar 9 so as to extend in a direction perpendicular to the longitudinal direction, the longitudinal end faces of the square bar 9 can be easily connected by the male fitting 4A or the female fitting 6A. Therefore, by changing the number of square bars 9 connected in the longitudinal direction, the longitudinal dimension of the structural member 300 can be easily changed, and structural members 300 of various dimensions can be obtained. Also, a structural member 300 with excellent strength can be obtained.

[0013] The invention described in claim 4 is, for example, as shown in FIGS. 1, 3, 8 to 11, in the structural member 100 described in claim 1, the male fitting 4 has a convex portion 42 that protrudes from the opposing surface of the one square bar 1a toward the other square bar 1b side on the opposing surface, the female fitting 6 has a concave portion 62 that is recessed inward from the opposing surface on the opposing surface of the other square bar 1b and engages with the convex portion 42, in a state where the convex portion 42 is engaged with the concave portion 62, The convex portion 42 has a tapered surface 421 that widens toward the concave portion 62 side so as to provide resistance to the pulling-out direction from the concave portion 62. The concave portion 62 has a tapered surface 621 that narrows toward the convex portion 42 side so as to provide resistance to the pulling-out direction. The convex portion 42 is slid along the longitudinal direction of the square bar with respect to the concave portion 62, and the tapered surface 421 of the convex portion 42 and the tapered surface 621 of the concave portion 62 are in contact with each other.

[0014] According to the invention described in claim 4, the male fitting 4 includes a convex portion 42 that protrudes from the opposing surface of one square bar 1a toward the other square bar 1b on the opposing surface. The female fitting 6 includes a concave portion 62 that is recessed inward from the opposing surface of the other square bar 1b and engages with the convex portion 42. In a state where the convex portion 42 is engaged with the concave portion 62, the convex portion 42 has a tapered surface 421 that widens toward the concave portion 62 side so as to provide resistance to the pulling-out direction from the concave portion 62. The concave portion 62 has a tapered surface 621 that narrows toward the convex portion 42 side so as to provide resistance to the pulling-out direction. The convex portion 42 is slid along the longitudinal direction of the square bar with respect to the concave portion 62, and the tapered surface 421 of the convex portion 42 and the tapered surface 621 of the concave portion 62 are in contact with each other. Therefore, when a force acts in the direction of pulling out the convex portion 42 from the concave portion 62, each tapered surface 421, 621 provides resistance to the pulling-out direction, and thus the convex portion 42 cannot be pulled out from the concave portion 62. Accordingly, the male fitting 4 and the female fitting 6 can be firmly fixed, and the square bars can be firmly connected to each other. Further, by sliding the convex portion 42 along the longitudinal direction of the square bar 1b with respect to the concave portion 62, the tapered surfaces 421, 621 come into contact and engage with each other, so that the square bars can be easily connected to each other.

[0015] The invention described in claim 5 is, for example, as shown in FIGS. 12 and 13, in the structural member 100 described in claim 1. A male rail portion 3 on which the male fitting 4 is provided is formed on the opposing surface of the one square bar 1a. The aramid fiber rod 71 is inserted from the male fitting 4 toward the male rail portion 3, and the male fitting 4 is fixed to the male rail portion 3 by sandwiching the periphery of the aramid fiber rod 71 with the stopper 73.

[0016] According to the invention described in claim 5, on the opposing surface of one square bar 1a, a male rail portion 3 provided with a male fitting 4 is formed. The aramid fiber rod 71 is inserted from the male fitting 4 toward the male rail portion 3, and the male fitting 4 is fixed to the male rail portion 3 by sandwiching the periphery of the aramid fiber rod 71 with the stopper 73. Here, since the aramid fiber rod 71 is very strong against pulling out, it can surely prevent the male fitting 4 from coming off the male rail portion 3. Also, since the periphery of the inserted aramid fiber rod 71 is sandwiched by the stopper 73, it can also prevent the inserted aramid fiber rod 71 from coming out.

[0017] The invention described in claim 6 is, for example, as shown in FIGS. 14 and 15, in the structural member 100 described in claim 1, on the opposing surface of the other square bar 1b, a female rail portion 5 provided with the female fitting 6 is formed, the female fitting 6 provided on the female rail portion 5 has an aramid fiber rod 81 inserted from the female fitting 6 toward the female rail portion 5, and the female fitting 6 is fixed to the female rail portion 5 by sandwiching the periphery of the aramid fiber rod 81 with the stopper 83.

[0018] According to the invention described in claim 6, a female rail portion 5 is formed on the opposing surface of the other square member 1b, and a female fitting 6 provided on the female rail portion 5 has an aramid fiber rod 81 inserted from the female fitting 6 toward the female rail portion 5, and the female fitting 6 is fixed to the female rail portion 5 by sandwiching the periphery of the aramid fiber rod 81 with a stopper 83. Here, since the aramid fiber rod 81 is very strong against pulling out, it is possible to reliably prevent the female fitting 6 from coming off the female rail portion 5. Further, since the periphery of the inserted aramid fiber rod 81 is sandwiched by the stopper 83, it is also possible to prevent the inserted aramid fiber rod 81 from coming out.

[0019] The invention described in claim 7 is a structure 200 formed by connecting a plurality of the structural materials 100a and 100b described in claim 2 in the longitudinal direction, as shown in FIGS. 4 to 7, for example, at the longitudinal end faces of the structural materials adjacent to each other, the male fitting or the female fitting 6 extending from the longitudinal end face 12 of the square member 1 constituting one of the structural materials 100a is engaged with the female fitting or the male fitting 4 of the other structural material 100b.

[0020] According to the invention described in claim 7, there is a structure 200 formed by connecting a plurality of the structural materials 100a and 100b in the longitudinal direction, and at the longitudinal end faces of the structural materials adjacent to each other, the male fitting or the female fitting 6 extending from the longitudinal end face 12 of the square member 1 constituting one of the structural materials 100a is engaged with the female fitting or the male fitting 4 of the other structural material 100b. Therefore, by engaging the male fitting or the female fitting 6 extending from the longitudinal end face 12 of one of the structural materials 100a with the female fitting or the male fitting 4 of the other structural material 100b, the structural materials can be easily and firmly connected in the longitudinal direction.

[0021] The invention described in claim 8 is a structure 400 formed by connecting a plurality of the structural materials 300a and 300b described in claim 3 in the longitudinal direction, as shown in FIGS. 17 and 18, for example, At the longitudinal end faces of adjacent structural members, the male fitting or the female fitting 6A provided on the longitudinal end face 92 of the angle member 9 constituting one of the structural members 300a is engaged with the male fitting 4A or the female fitting provided on the longitudinal end face 92 of the angle member 9 constituting the other structural member 300b.

[0022] According to the invention described in claim 8, there is provided a structure 400 formed by connecting a plurality of structural members 300a and 300b in the longitudinal direction. At the longitudinal end faces of adjacent structural members, the male fitting or the female fitting 6A provided on the longitudinal end face 92 of the angle member 9 constituting one of the structural members 300a is engaged with the male fitting 4A or the female fitting provided on the longitudinal end face 92 of the angle member 9 constituting the other structural member 300b. Therefore, by engaging the male fitting or the female fitting 6A provided on the longitudinal end face 92 of one of the structural members 300a with the male fitting 4A or the female fitting of the other structural member 300b, the structural members can be easily and firmly connected in the longitudinal direction.

Advantages of the Invention

[0023] According to the present invention, by using conventional angle members, it is possible to provide structural members and structures that can be easily manufactured at low cost with easy material procurement, can be easily manufactured in various dimensions, and have sufficient strength.

Brief Description of the Drawings

[0024]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Figure 14

Figure 15

Figure 16

Figure 17

Figure 18

Embodiments for Carrying Out the Invention

[0025] Hereinafter, embodiments will be described with reference to the drawings. The features and technical effects of the embodiments will be understood from the following detailed description and the drawings. However, the scope of the present invention is not limited to the embodiments disclosed below. Since the drawings are provided for illustrative purposes only, the scope of the present invention is not limited to the illustrations in the drawings.

[0026] 1. First Embodiment [Structural Member] FIG. 1 is an exploded perspective view of a structural member, and FIG. 2 is a top view of FIG. 1. FIG. 3 is a top view of a structural member formed by connecting the angle members shown in FIG. 1. The structural member 100 is formed by connecting a plurality of long angle members 1 with connecting fittings M. The connecting fitting M includes a male fitting 4 and a female fitting 6. Hereinafter, a structural member 100 in which eight angle members 1 are connected with connecting fittings M will be described, but the number of angle members 1 is not limited to this.

[0027] <Angle member> The angle member 1 is made of a woody material such as cypress, larch, or cedar, for example. The angle member 1 is a longitudinally long member and is substantially square in a top cross-sectional view. The angle member 1 is preferably, for example, 3 m in length, 120 mm × 120 mm square, or 150 mm × 150 mm, which are generally in circulation. A plurality of angle members 1 are arranged with their longitudinal side surfaces 11 facing each other. Eight angle members 1 are arranged with their longitudinal side surfaces 11 facing each other in a rectangular frame shape in a plan view. As a result, a longitudinally long and substantially square-shaped space S is formed inside the eight angle members 1 arranged in a rectangular frame shape (see FIG. 3). Hereinafter, the longitudinal side surface 11 is a side surface along the longitudinal direction of the angle member 1. The longitudinal end surface 12 of the angle member 1 is a surface perpendicular to the longitudinal side surface 11 and refers to the upper and lower surfaces of the angle member 1 in FIG. 1.

[0028] Among the eight angle members 1, the angle member 1a arranged at the corner portion in a top view in FIG. 2 has a male rail portion 3 and a female rail portion 5 formed along the longitudinal direction on two adjacent longitudinal side surfaces 11 out of the four longitudinal side surfaces 11. The male rail portion 3 is formed by being recessed in a rectangular shape in a top view on the longitudinal side surface 11 of the angle member 1. A male fitting 4 is attached to the male rail portion 3. The female rail portion 5 is formed by being recessed in a rectangular shape in a top view on the longitudinal side surface 11 of the angle member 1. A female fitting 6 is attached to the female rail portion 5.

[0029] Of the eight square timbers 1, the square timbers 1b arranged other than at the corner portions in the top view in FIG. 2 have the male rail portion 3 and the female rail portion 5 formed along the longitudinal direction on two longitudinal side surfaces 11 that are in a front-back relationship with each other among the four longitudinal side surfaces 11. Further, a male fitting 4 is attached to the male rail portion 3, and a female fitting 6 is attached to the female rail portion 5.

[0030] As described above, for adjacent square timbers, the male fitting 4 attached to one square timber 1a and the female fitting 6 attached to the other square timber 1b face each other. Then, the male fitting 4 and the female fitting 6 facing each other engage with each other, thereby connecting the adjacent square timbers. Details of the male rail portion 3, the male fitting 4, the female rail portion 5, and the female fitting 6 will be described later.

[0031] Note that the structural member 100 shown in FIG. 1 is used as the lower structural member 100a in the structure 200 described later. The upper end portions of the female fittings 6 extend from the longitudinal end faces 12, that is, the upper surfaces, of each square timber 1 of the lower structural member 100a. As will be described later, the extended portion 63 of the female fitting 6 is configured to engage with the male fitting 4 of the upper structural member 100b.

[0032] [Structure] Next, the structure 200 using the above-described structural member 100 will be described. The structure 200 can be used, for example, as a glued laminated timber used for columns, beams, or internal structures such as structures in wooden buildings. Hereinafter, the case of application to a column will be described as an example.

[0033] FIG. 4 is an exploded perspective view of the structure, and FIG. 5 is an external perspective view of the structure. FIG. 6 is a cross-sectional view taken along the arrow in the VI-VI line of FIG. 4, and FIG. 7 is a cross-sectional view taken along the arrow in the VII-VII line of FIG. 4. The structure 200 is formed by connecting the lower structural member 100a and the upper structural member 100b. The lower structural member 100a and the upper structural member 100b each include eight square timbers 1. The lower structural member 100a is the same as the structural member 100 shown in FIG. 1 described above. The lower structural member 100a is formed by arranging eight square members 1 in a rectangular frame shape in a top view, and by engaging the male fittings 4 and the female fittings 6 facing each other, the eight square members 1 are connected. The upper structural member 100b is also formed by arranging eight square members 1 in a rectangular frame shape in a top view, and by engaging the male fittings 4 and the female fittings 6 facing each other, the eight square members 1 are connected. Here, as will be described later, the male fitting 4 and the female fitting 6 are engaged by sliding the convex portion 42 of the male fitting 4 into the concave portion 62 of the female fitting 6.

[0034] In the lower structural member 100a, the length of the female fitting 6 in the longitudinal direction is longer than the length of the male fitting 4 in the longitudinal direction. Therefore, the female fitting 6 extends from the upper surface which is the longitudinal end surface 12 of the eight connected square members 1. That is, the female fitting 6 extends from the upper surface of the lower structural member 100a. The length L1 of the extending portion 63 of the female fitting 6 is preferably about one-fourth of the total length of the upper structural member 100b connected to the upper side. By setting the length L1 of the extending portion 63 to about one-fourth of the total length of the upper structural member 100b to be connected, the lower structural member 100a and the upper structural member 100b can be surely connected and the strength can also be ensured.

[0035] As shown in FIG. 6, the arrangement of the male fittings 4 and the female fittings 6 attached to the eight square members 1 constituting the upper structural member 100b is basically the same as the arrangement of the male fittings 4 and the female fittings 6 attached to the eight square members 1 of the lower structural member 100a. However, in the eight square members 1 of the upper structural member 100b, the difference is that the female fitting 6 is not attached to the portion where the extending portion 63 of the female fitting 6 attached to the lower structural member 100a is inserted. Specifically, as shown in FIG. 7, in the female rail portion 5 of the square member 1 of the upper structural member 100b, the extending portion 63 of the female fitting 6 attached to the lower structural member 100a is inserted into a portion about one-fourth from the lower end. Therefore, as shown in FIG. 6, the female fitting 6 is attached in advance only to a portion about three-fourths from the upper end in the female rail portion 5 of the square member 1 of the upper structural member 100b. Note that Fig. 6 is a sectional view taken in the direction of the arrow at a portion from the upper end of the upper structural member 100b to three-fourths of its total length. Fig. 7 is a sectional view taken in the direction of the arrow at a portion from the lower end of the upper structural member 100b to one-fourth of its total length.

[0036] As shown in Figs. 4 and 5, the extended portion 63 of the female fitting 6 of the lower structural member 100a is slid and fitted into the female rail portion 5 of the upper structural member 100b, and the extended portion 63 is engaged with the male fitting 4 of the upper structural member 100b. Thereby, the lower structural member 100a and the upper structural member 100b are connected to form the structure 200. Note that it is preferable in terms of strength to fill the outer peripheral surface, which is the joint between the lower structural member 100a and the upper structural member 100b, with a filler such as high-strength mortar (not shown). Further, a reinforcing fitting or the like may be wound around the outer peripheral surface, which is the joint.

[0037] [Connecting fitting] Fig. 8 is an external perspective view of the male fitting, and Fig. 9 is a sectional view taken in the longitudinal direction end face showing a state where the male fitting is attached to the male rail portion of the square bar. The connecting fitting M includes a male fitting 4 and a female fitting 6. The male fitting 4 is preferably made of steel. The male fitting 4 includes a fitting portion 41 fitted into the male rail portion 3 and a convex portion 42 formed on the fitting portion 41. The fitting portion 41 is a long plate-shaped member having the same shape as the male rail portion 3 and has a rectangular shape in sectional view. The convex portion 42 protrudes from the side surface (longitudinal side surface) along the longitudinal direction of the fitting portion 41 toward the other square bar 1b side. When the convex portion 42 is engaged with the concave portion 62 of the female fitting 6 provided on the other square bar 1b, the convex portion 42 has a tapered surface 421 that widens toward the concave portion 62 so as to resist the pulling-out direction from the concave portion 62 (see Figs. 2 and 3). Further, the tip of the convex portion 42 has a parallel surface 422 parallel to the longitudinal side surface of the fitting portion 41 (or the longitudinal side surface 11 of the square bar 1a). Therefore, the convex portion 42 is formed in a substantially triangular shape in sectional view by the tapered surface 421 and the parallel surface 422. In the cross-sectional view of FIG. 9, the angle θ1 formed by the longitudinal side surface of the fitting portion 41 and the tapered surface 421 of the convex portion 42 is preferably, for example, 45 degrees. By setting the angle θ1 to 45 degrees, the convex portion 42 can be prevented from coming out of the concave portion 62.

[0038] A hidden hole 423 into which a screw is driven is formed in the parallel surface 422 of the convex portion 42. Note that in FIG. 8, the hidden hole 423 is not shown due to the drawing relationship. The fitting portion 41 is fitted into the male rail portion 3 of the square bar 1, and the male fitting 4 is attached by driving a screw B from the parallel surface 422 of the convex portion 42 toward the bottom surface 31 forming the male rail portion 3.

[0039] FIG. 10 is an external perspective view of the female fitting, and FIG. 11 is a cross-sectional view of the longitudinal end surface showing a state in which the female fitting is attached to the female rail portion of the square bar. The female fitting 6 is preferably made of steel. The female fitting 6 includes a fitting portion 61 that is fitted into the female rail portion 5 and a concave portion 62 formed in the fitting portion 61. The fitting portion 61 is a long plate-shaped member having the same shape as the female rail portion 5 and has a rectangular shape in cross-sectional view. The concave portion 62 is recessed inward from the longitudinal side surface (longitudinal side surface) of the fitting portion 61 along the longitudinal direction. And when the convex portion 42 of the male fitting 4 provided on the one square bar 1a is engaged with the concave portion 62, the concave portion 62 has a tapered surface 621 that becomes narrower toward the convex portion 42 so as to provide resistance against the pulling-out direction (see FIG. 2). Therefore, the concave portion 62 is formed in a substantially triangular shape in cross-sectional view by the tapered surface 621 and the bottom surface 622 forming the concave portion 62. In the cross-sectional view of FIG. 11, the angle θ2 formed by the bottom surface 622 forming the concave portion 62 and the tapered surface 621 is preferably the same angle as the angle θ1, and is preferably 45 degrees. By setting the angle θ2 to 45 degrees, the convex portion 42 can be prevented from coming out of the concave portion 62.

[0040] On the bottom surface 622 forming the recess 62, a hidden hole 623 into which a screw B is driven is formed. Note that in FIG. 10, due to the relationship of the drawing, the hidden hole 623 is not shown. The fitting portion 61 is fitted into the female rail portion 5 of the square bar 1, and the screw B is driven from the bottom surface 622 forming the recess 62 toward the bottom surface forming the female rail portion 5, whereby the female fitting 6 is attached.

[0041] As described above, the male fitting 4 is attached to the male rail portion 3, and the female fitting 6 is attached to the female rail portion 5. Then, the convex portion 42 of the male fitting 4 is slid along the longitudinal direction from the longitudinal end portion of the square bar 1 with respect to the recess 62 of the female fitting 6. As a result, the tapered surface 421 of the convex portion 42 and the tapered surface 621 of the recess 62 come into contact with each other. As a result, the convex portion 42 does not come out of the recess 62.

[0042] (Modification example) The male fitting 4 and the female fitting 6 are each fixed to the male rail portion 3 and the female rail portion 5 by screws B, but the fixing method is not limited to this. Hereinafter, a modification example of the fixing method will be described. FIG. 12 is a longitudinal side view showing a state in which a male fitting is attached to the male rail portion of a square bar, and FIG. 13 is a cross-sectional view taken along the line XIII-XIII in FIG. 12. In the convex portion 42 of the male fitting 4, a hole portion 424 is formed substantially perpendicular to the parallel surface 422 toward the fitting portion 41. A plurality of hole portions 424 are formed at predetermined intervals along the longitudinal direction of the convex portion 42. The hole portion 424 has a substantially circular cross-sectional shape. On the bottom surface 31 of the male rail portion 3, a hole portion 32 is formed from the bottom surface 31 toward the inside of the square bar 1. The hole portion 32 is substantially perpendicular to the bottom surface 31 of the male rail portion 3. The hole portions 32 formed in the male rail portion 3 are formed in a plurality at predetermined intervals along the longitudinal direction of the male rail portion 3 so as to correspond to the hole portions 424. Therefore, the convex portions 42 of the male fitting 4, the fitting portions 41, and the hole portions 424 and 32 formed in the square bar 1 are continuous. The length L2 of the continuous hole 33 formed by the continuous hole portions 424 and 32 is preferably 250 mm or more and is longer than the length of the aramid fiber rod 71 described later. Further, the diameter of the continuous hole 33 is larger than the diameter of the aramid fiber rod 71.

[0043] An aramid fiber rod 71 is inserted into the continuous hole 33. The aramid fiber rod 71 has a cylindrical shape and is made of aramid fiber. The length of the aramid fiber rod 71 is a length that can be inserted into the continuous hole 33, and preferably a length that does not protrude from the parallel surface 422 of the convex portion 42. The length of the aramid fiber rod 71 is preferably 240 mm or more. Further, the continuous hole 33 is filled with an epoxy resin. Thereby, the gap between the periphery of the aramid fiber rod 71 and the continuous hole 33 is fixed with the epoxy resin 72.

[0044] The aramid fiber rod 71 inserted into the continuous hole 33 is fixed by a stopper 73 inserted into the hole portion 424 of the convex portion 42. The stopper 73 has a ring shape. Inside the ring shape, the head of the aramid fiber rod 71 inserted into the continuous hole 33 is arranged, and the periphery of the aramid fiber rod 71 is sandwiched. In this way, the aramid fiber rod 71 is fixed so as not to come out of the continuous hole 33.

[0045] In addition, the fixing of the male fitting 4 to the male rail portion 3 may be performed by screws as described above in addition to the fixing by the aramid fiber rod 71 and the stopper 73.

[0046] FIG. 14 is a longitudinal side view showing a state in which a female fitting is attached to a female rail portion of a square bar, and FIG. 15 is a cross-sectional view taken along the line XV-XV in FIG. 14. A hole 624 is formed substantially perpendicular to the bottom surface 51 of the female rail portion 5 from the bottom surface 622 forming the recess 62 of the female fitting 6. A plurality of holes 624 are formed at predetermined intervals along the longitudinal direction of the recess 62. The hole 624 has a substantially circular cross-sectional shape. A hole 52 is formed in the bottom surface 51 of the female rail portion 5 from the bottom surface 51 toward the inside of the square bar 1. The hole 52 is substantially perpendicular to the bottom surface 51 of the female rail portion 5. A plurality of holes 52 formed in the female rail portion 5 are formed at predetermined intervals along the longitudinal direction of the female rail portion 5 so as to correspond to the holes 624. Therefore, the recess 62 of the female fitting 6, the fitting portion 61, and the holes 624 and 52 formed in the square bar 1 are continuous. The length L3 of the continuous hole 53 formed by the continuous holes 624 and 52 is preferably 250 mm or more and longer than the length of the aramid fiber rod 81 described later. Also, the diameter of the continuous hole 53 is larger than the diameter of the aramid fiber rod 81.

[0047] An aramid fiber rod 81 is inserted into the continuous hole 53. The aramid fiber rod 81 has a columnar shape and is made of aramid fiber. The length of the aramid fiber rod 81 is preferably a length that can be inserted into the continuous hole 53 and does not protrude from the bottom surface 622 forming the recess 62. The length of the aramid fiber rod 81 is preferably 240 mm or more. Also, the continuous hole 53 is filled with an epoxy resin 82. Thereby, the gap between the periphery of the aramid fiber rod 81 and the continuous hole 53 is fixed with the epoxy resin 82.

[0048] The aramid fiber rod 81 inserted into the continuous hole 53 is fixed by a stopper 83 inserted into the hole 624 of the recess 62. The stopper 83 has a ring shape. Inside the ring shape, the head of the aramid fiber rod 81 inserted into the continuous hole 53 is arranged, and the periphery of the aramid fiber rod 81 is sandwiched. In this way, the aramid fiber rod 81 is fixed so as not to come out of the continuous hole 53.

[0049] In addition to the fixation of the female fitting 6 to the female rail portion 5 by the aramid fiber rod 81 and the stopper 83, fixation with screws may be performed as described above.

[0050] According to the first embodiment, the following excellent effects can be achieved. The structural member 100 is a structural member 100 formed by connecting a plurality of long square bars 1 with a connecting fitting M. The connecting fitting M includes a male fitting 4 and a female fitting 6 that can engage with each other. One square bar 1a and the other square bar 1b are arranged with their longitudinal side surfaces 11 facing each other. On the opposing surface of the longitudinal side surface 11 of one square bar 1a with the other square bar 1b, the male fitting 4 is provided to extend in the longitudinal direction. On the opposing surface of the longitudinal side surface 11 of the other square bar 1b with one square bar 1a, the female fitting 6 is provided to extend in the longitudinal direction. By engaging the male fitting 4 and the female fitting 6, the longitudinal side surface 11 of one square bar 1a and the longitudinal side surface 11 of the other square bar 1b are connected. Therefore, by engaging the male fitting 4 of one square bar 1a and the female fitting 6 of the other square bar 1b with each other, the longitudinal side surface 11 of one square bar 1a and the other square bar 1b can be easily connected in the longitudinal side surface 11. Therefore, for example, if conventional square bars are used as the square bars 1 and they are connected with the male fitting 4 and the female fitting 6, material procurement is easy and it can be manufactured at low cost. Also, by appropriately changing the number of square bars 1, the cross-sectional area of the structural member 100 can be easily changed, and structural members 100 of various dimensions can be obtained. Moreover, since they are connected by the male fitting 4 and the female fitting 6, a structural member 100 with excellent strength can be obtained. Furthermore, by appropriately changing the material of the square bar 1, the strength of the structural member 100 can also be freely changed, increasing the range of applications.

[0051] Since the longitudinal end of the female fitting 6 of the structural member 100a extends from the longitudinal end face 12 of the square timber 1, it can be easily connected to the longitudinal end face of another square timber using this extended female fitting 6. Therefore, by changing the number of square timbers 1 connected in the longitudinal direction, the longitudinal dimension of the structural member 100 can be easily changed, and structural members 100 with various dimensions can be obtained. Also, a structural member 100 with excellent strength can be obtained.

[0052] The male fitting 4 has a convex portion 42 that protrudes from the opposing surface of one square timber 1a toward the other square timber 1b on the opposing surface. The female fitting 6 has a concave portion 62 that is recessed inward from the opposing surface on the opposing surface of the other square timber 1b and engages with the convex portion 42. In a state where the convex portion 42 is engaged with the concave portion 62, the convex portion 42 has a tapered surface 421 that widens toward the concave portion 62 so as to resist the pulling-out direction from the concave portion 62, and the concave portion 62 has a tapered surface 621 that narrows toward the convex portion 42 so as to resist the pulling-out direction. By sliding the convex portion 42 along the longitudinal direction of the square timber with respect to the concave portion 62, the tapered surface 421 of the convex portion 42 and the tapered surface 621 of the concave portion 62 are in contact with each other. Therefore, when a force acts in the direction of pulling out the convex portion 42 from the concave portion 62, each tapered surface 421, 621 resists the pulling-out direction, so the convex portion 42 cannot be pulled out from the concave portion 62. Therefore, the male fitting 4 and the female fitting 6 can be firmly fixed, and the square timbers can be firmly connected. Also, by sliding the convex portion 42 along the longitudinal direction of the square timber 1b with respect to the concave portion 62, the tapered surfaces 421, 621 come into contact and engage with each other, so the square timbers can be easily connected.

[0053] On the opposing surface of one square bar 1a, a male rail portion 3 is formed where a male fitting 4 is provided. An aramid fiber rod 71 is inserted from the male fitting 4 toward the male rail portion 3, and by sandwiching the periphery of the aramid fiber rod 71 with a stopper 73, the male fitting 4 is fixed to the male rail portion 3. Here, since the aramid fiber rod 71 is very strong against pulling out, it can surely prevent the male fitting 4 from coming off the male rail portion 3. Also, since the periphery of the aramid fiber rod 71 is sandwiched by the stopper 73, it can also prevent the inserted aramid fiber rod 71 from coming out.

[0054] On the opposing surface of the other square bar 1b, a female rail portion 5 is formed where a female fitting 6 is provided. The female fitting 6 provided on the female rail portion 5 has an aramid fiber rod 81 inserted from the female fitting 6 toward the female rail portion 5, and by sandwiching the periphery of the aramid fiber rod 81 with a stopper 83, the female fitting 6 is fixed to the female rail portion 5. Here, since the aramid fiber rod 81 is very strong against pulling out, it can surely prevent the female fitting 6 from coming off the female rail portion 5. Also, since the periphery of the aramid fiber rod 81 is sandwiched by the stopper 83, it can also prevent the inserted aramid fiber rod 81 from coming out.

[0055] Also, the structure 200 is a structure 200 formed by connecting a plurality of structural materials 100a and 100b in the longitudinal direction. At the longitudinal end faces of the structural materials adjacent to each other, a male fitting or a female fitting 6 extending from the longitudinal end face 12 of the square bar 1 constituting one structural material 100a is engaged with the female fitting or the male fitting 4 of the other structural material 100b. Therefore, by engaging the female fitting or the male fitting 4 of the other structural material 100b with the male fitting or the female fitting 6 extending from the longitudinal end face 12 of one structural material 100a, the structural materials can be easily and firmly connected in the longitudinal direction.

[0056] 2. Second Embodiment The structure of the above first embodiment was described for the case of application to a column, but the structure of the second embodiment is for the case of application to a beam. [Structural member] FIG. 16 is an exploded perspective view of the structural member. The structural member 300 is formed by connecting a plurality of long angle members 9 with connecting fittings M. Hereinafter, the structural member 300 formed by connecting three angle members 9 with connecting fittings M will be described, but the number of angle members 9 is not limited to this. Also, the connecting fittings M are the male fitting 4 and the female fitting 6 similar to the connecting fittings M of the first embodiment. Therefore, the same reference numerals are given to the same components and their description is omitted.

[0057] [Angle member] The angle member 9 is made of a woody material in the same manner as the angle member 1 of the first embodiment. The angle member 9 is a member that is long in the left and right directions, and the cross section of the longitudinal end face is substantially rectangular. The angle member 9 is preferably, for example, 3 m in length, which is generally in circulation. Three angle members 9 are arranged in parallel with their longitudinal side faces 91 facing each other. Specifically, in FIG. 16, angle members 9b and 9c are arranged in front of and behind the angle member 9a arranged in the center, respectively. Hereinafter, the angle member arranged in the center is referred to as the central angle member 9a. Also, the angle member arranged in front of the central angle member 9a is referred to as the front angle member 9b, and the angle member arranged behind the central angle member 9a is referred to as the rear angle member 9c. Furthermore, hereinafter, the longitudinal side face 91 refers to the two side faces with the larger area among the four side faces along the longitudinal direction of the angle member 9. The longitudinal end face 92 is a face perpendicular to the longitudinal side face 91, and in FIG. 16, it refers to the right end face or the left end face of the angle member 9.

[0058] In FIG. 16, on the opposing surface of the longitudinal side face 91 of the front angle member 9b with the central angle member 9a, a male rail portion 3 and a female rail portion 5 are formed one by one along the longitudinal direction. The male rail portion 3 and the female rail portion 5 are formed parallel to each other. In FIG. 16, the upper side is the male rail portion 3 and the lower side is the female rail portion 5. Among the longitudinal side surfaces 91 of the rear corner member 9c, on the surface facing the central corner member 9a, a female rail portion 5 and a male rail portion 3 are also formed one by one along the longitudinal direction. The male rail portion 3 and the female rail portion 5 are formed parallel to each other. In Fig. 16, the upper side is the female rail portion 5 and the lower side is the male rail portion 3. Among the longitudinal side surfaces 91 of the central corner member 9a, on the surface facing the front corner member 9b, a female rail portion 5 and a male rail portion 3 are formed one by one along the longitudinal direction. In Fig. 16, the upper side is the female rail portion 5 and the lower side is the male rail portion 3. Also, among the longitudinal side surfaces 91 of the central corner member 9a, on the surface facing the rear corner member 9c, a male rail portion 3 and a female rail portion 5 are formed one by one along the longitudinal direction. In Fig. 16, the upper side is the male rail portion 3 and the lower side is the female rail portion 5.

[0059] The male rail portions 3 and the female rail portions 5 formed on these front corner member 9b, rear corner member 9c, and central corner member 9a are recessed in a rectangular shape in side cross-sectional view on the longitudinal side surface 91 of the corner member, similar to the male rail portion 3 and the female rail portion 5 of the first embodiment. Also, a male fitting 4 similar to that of the first embodiment is attached to the male rail portion 3. A female fitting 6 similar to that of the first embodiment is attached to the female rail portion 5. Therefore, by sliding the convex portion 42 of the male fitting 4 of the front corner member 9b into the concave portion 62 of the female fitting 6 of the central corner member 9 and engaging them, and by sliding the convex portion 42 of the male fitting 4 of the central corner member 9a into the concave portion 62 of the female fitting 6 of the front corner member 9b and engaging them, the front corner member 9b and the central corner member 9a are connected.

[0060] Also, by sliding the convex portion 42 of the male fitting 4 of the rear corner member 9c into the concave portion 62 of the female fitting 6 of the central corner member 9a and engaging them, and by sliding the convex portion 42 of the male fitting 4 of the central corner member 9a into the concave portion 62 of the female fitting 6 of the rear corner member 9c and engaging them, the rear corner member 9c and the central corner member 9a are connected.

[0061] Note that the structural member 300 shown in Fig. 16 is used as the left structural member 300a in the structure 400 described later. A female rail portion 5A is formed on the longitudinal end face 92, i.e., the right end face, of each square bar 9 of the left structural member 300a. And a female fitting 6A is attached to the female rail portion 5A. This female fitting 6A is adapted to engage with the male fitting 4A of the right structural member 300b in the structure 400 described later. Details will be described later.

[0062] [Structure] Next, the structure 400 using the above-described structural member 300 will be described. Fig. 17 is an exploded perspective view of the structure, and Fig. 18 is an external perspective view of the structure. The structure 400 includes a left structural member 300a and a right structural member 300b. In the structure 400, the right end face of the left structural member 300a and the left end face of the right structural member 300b are connected. The left structural member 300a and the right structural member 300b each include three square bars 9. The left structural member 300a is the same as the structural member 300 shown in Fig. 16 described above. In the left structural member 300a, three square bars 9 are arranged so that their longitudinal side faces 91 are overlapped with each other in parallel. And the three square bars 9 are connected by the engagement of the male fittings 4 and the female fittings 6 facing each other. In the right structural member 300b as well, three square bars 9 are arranged so that their longitudinal side faces 91 are overlapped with each other in parallel. And the three square bars 9 are connected by the engagement of the male fittings 4 and the female fittings 6 facing each other. Here, the male fitting 4 and the female fitting 6 are engaged by sliding the convex portion 42 of the male fitting 4 into the concave portion 62 of the female fitting 6.

[0063] Female rail portions 5A are formed on the longitudinal end faces 92 of the left structural member 300a, that is, the right end faces of the three square bars 9 constituting the left structural member 300a, respectively. Male rail portions 3A are formed on the longitudinal end faces 92 of the right structural member 300b, that is, the left end faces of the three square bars 9 constituting the right structural member 300b, respectively. The female rail portions 5A and male rail portions 3A formed on the right and left end faces of these square bars 9 are recessed in a rectangular shape in cross section on the right and left end faces of the square bar 9, similar to the female rail portion 5 and male rail portion 3 formed on the longitudinal side surface 91 of the square bar 9. Further, a male fitting 4A is attached to the male rail portion 3A, and a female fitting 6A is attached to the female rail portion 5A. Note that since the structures of the female rail portion 5A and male rail portion 3A formed on the longitudinal end faces of the square bar 9 are the same as the structures of the female rail portion 5 and male rail portion 3 on the longitudinal side surface of the square bar 9, respectively, the description thereof is omitted. Also, since the structures of the male fitting 4A and female fitting 6A are the same as the structures of the male fitting 4 and male fitting 6, respectively, the description thereof is omitted.

[0064] As shown in FIGS. 17 and 18, the convex portion 42 of the male fitting 4A attached to the left end face of the right structural member 300b is engaged with the concave portion 62 of the female fitting 6A attached to the right end face of the left structural member 300a by sliding. Thereby, the left structural member 300a and the right structural member 300b are connected to form the structure 400. Note that it is preferable in terms of strength to fill the outer peripheral surface, which is the joint between the left structural member 300a and the right structural member 300b, with a filler such as mortar (not shown). Further, a reinforcing fitting or the like may be wound around the outer peripheral surface, which is the joint.

[0065] Note that the structure 200 of the first embodiment can be used as a column, and the structure 400 of the second embodiment can be used as a beam, and these column and beam can be connected separately using a connecting fitting.

[0066] Note that the method of fixing the male fittings 4, 4A and the female fittings 6, 6A to the square bar 9 can be the same as in the first embodiment, such as fixing with screws or using aramid fiber rods.

[0067] According to the second embodiment, the following excellent effects are achieved. In the structural member 300, since the male fitting 4A or the female fitting 6A is further provided on the longitudinal end face 92 of the square timber 9 so as to extend in a direction orthogonal to the longitudinal direction, the longitudinal end faces of the square timbers 9 can be easily connected by the male fitting 4A or the female fitting 6A. Therefore, by changing the number of square timbers 9 connected in the longitudinal direction, the longitudinal dimension of the structural member 300 can be easily changed, and the structural members 300 of various dimensions can be obtained. Further, the structural member 300 excellent in strength can be obtained.

[0068] A structure 400 formed by connecting a plurality of structural members 300a and 300b in the longitudinal direction. At the longitudinal end faces of the structural members adjacent to each other, a male fitting or a female fitting 6A provided on the longitudinal end face 92 of the square timber 9 constituting one structural member 300a is engaged with a male fitting 4A or a female fitting provided on the longitudinal end face 92 of the square timber 9 constituting the other structural member 300b. Therefore, by engaging the male fitting or the female fitting 6A provided on the longitudinal end face 92 of one structural member 300a with the male fitting 4A or the female fitting of the other structural member 300b, the structural members can be easily and firmly connected in the longitudinal direction.

[0069] In recent years, the realization of a decarbonized society by promoting carbon neutrality with substantially zero carbon dioxide emissions and the achievement of the SDGs (Sustainable Development Goals) have been demanded. Also in the construction industry, efforts have been made to make buildings wooden with low carbon dioxide emissions. Since the above structural members 100, 300 and structures 200, 400 use square timbers which are woody materials, they can contribute to the realization of a decarbonized society by promoting carbon neutrality and the achievement of the SDGs.

[0070] It should be noted that the embodiments to which the present invention is applicable are not limited to the above-described embodiments, and can be appropriately changed without departing from the gist of the present invention. Hereinafter, modification examples will be described. The modification examples listed below may be combined as much as possible. Further, in the following modification examples, elements common to the above-described embodiments are denoted by common reference numerals, and the description thereof is omitted or simplified.

[0071] In the structure 200 of the above first embodiment, it is assumed that the upper end portion of the female fitting 6 extends from the longitudinal end face 12 of the lower structural member 100a. However, without being limited thereto (not shown), the upper end portion of the male fitting 4 may extend from the longitudinal end face 12 of the lower structural member 100a. In this case, it is preferable to adopt a structure in which it engages with the female fitting 6 of the upper structural member 100b.

[0072] Also, in the structural member 100a of the above first embodiment, it is assumed that the male fitting 4 and the female fitting 6 are respectively attached to the two longitudinal side faces 11 of each square bar 1. However, connection fittings may also be attached to three or four longitudinal side faces of each square bar. Thereby, the number of square bars to be connected can be increased, and the cross-sectional area at the longitudinal end face of the structure 200 can be enlarged. Furthermore, in the structural member 100a, it is assumed that the female fitting 6 extends only from the upper end face among the longitudinal end faces 12 of the square bar 1. However, the female fitting 6 may also be extended from the lower end face, and another structural member may be further connected to the lower end face. Thereby, the dimension in the longitudinal direction of the structure 200 can be lengthened.

[0073] Similarly, in the structural member 300 of the second embodiment, connection fittings M may be attached to the two side faces with the smaller area among the four side faces along the longitudinal direction of the square bar 9. Thereby, the number of square bars 9 to be connected can be increased, and the cross-sectional area at the longitudinal end face of the structure 400 can be enlarged. Furthermore, it is assumed that the male fitting 4A or the female fitting 6A is attached only to one end face among the longitudinal end faces 92 of the square bar 9. However, the male fitting 4A or the female fitting 6A may also be attached to the other end face. Thereby, the number of square bars 9 to be connected can be increased, and the dimension in the longitudinal direction of the structure 300 can be lengthened.

Explanation of Reference Numerals

[0074] 1, 1a, 1b, 9 Square bars 3 Male rail portions 4, 4A Male fittings 5 Female Rail Part 6, 6A Female Fittings 11, 91 Longitudinal Side 12, 92 Longitudinal End Face 42 Protrusion 62 Recess 71, 81 Aramid Fiber Rod 73, 83 Stopper 100, 100a, 100b, 300, 300a, 300b Structural Materials 200, 400 Structures 421, 621 Tapered Surfaces M Connecting Fittings

Claims

1. A structural member formed by connecting a plurality of long-shaped square bars with a connecting fitting, wherein the connecting fitting includes a male fitting and a female fitting that can engage with each other, one square bar and the other square bar are arranged with their longitudinal side surfaces facing each other, among the longitudinal side surfaces of the one square bar, the male fitting is provided so as to extend in the longitudinal direction on the opposing surface to the other square bar, among the longitudinal side surfaces of the other square bar, the female fitting is provided so as to extend in the longitudinal direction on the opposing surface to the one square bar, by engaging the male fitting and the female fitting, the longitudinal side surface of the one square bar and the longitudinal side surface of the other square bar are connected. A structural member characterized by the above.

2. The longitudinal end of the male fitting or the longitudinal end of the female fitting extends from the longitudinal end face of the square bar. The structural member according to claim 1, characterized by the above.

3. On the longitudinal end face of the square bar, the male fitting or the female fitting is further provided so as to extend in a direction perpendicular to the longitudinal direction. The structural member according to claim 1, characterized by the above.

4. The male fitting has a convex portion on the opposing surface of the one square bar, which protrudes from the opposing surface toward the other square bar, the female fitting has a concave portion on the opposing surface of the other square bar, which is recessed inward from the opposing surface and engages with the convex portion, in a state where the convex portion engages with the concave portion, the convex portion has a tapered surface that widens toward the concave portion so as to resist the pulling-out direction from the concave portion, the concave portion has a tapered surface that narrows toward the convex portion so as to resist the pulling-out direction, by sliding the convex portion along the longitudinal direction of the square bar with respect to the concave portion, the tapered surface of the convex portion and the tapered surface of the concave portion are in contact with each other. The structural member according to claim 1, characterized by the above.

5. A male rail portion where the male fitting is provided is formed on the opposing surface of the one square bar, an aramid fiber rod is inserted from the male fitting toward the male rail portion, and by sandwiching the periphery of the aramid fiber rod with a stopper, the male fitting is fixed to the male rail portion. The structural member according to claim 1, characterized by the above.

6. A female rail portion where the female fitting is provided is formed on the opposing surface of the other square bar. The female fitting provided on the female rail portion has an aramid fiber rod inserted from the female fitting toward the female rail portion, and the female fitting is fixed to the female rail portion by sandwiching the periphery of the aramid fiber rod with a stopper. The structural material according to claim 1, characterized in that.

7. A structure formed by connecting a plurality of the structural materials according to claim 2 in the longitudinal direction, At the longitudinal end faces of adjacent structural materials, the male fitting or the female fitting extending from the longitudinal end face of the angle member constituting one of the structural materials is engaged with the female fitting or the male fitting of the other structural material. A structure characterized by that.

8. A structure formed by connecting a plurality of the structural materials according to claim 3 in the longitudinal direction, At the longitudinal end faces of adjacent structural materials, the male fitting or the female fitting provided on the longitudinal end face of the angle member constituting one of the structural materials is engaged with the male fitting or the female fitting provided on the longitudinal end face of the angle member constituting the other structural material. A structure characterized by that.

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