Plate-like member and three-dimensional structure using the plate-like member

Abstract

The present invention provides a bonded three-dimensional structure formed by combining plate-like members. [Solution] The present invention relates to a three-dimensional structure using a first plate-like member 2, a second plate-like member 8, and a third plate-like member 13 having the same plate thickness and height, in which a first cutout portion 2, a second cutout portion 5, and a connecting portion 205 are formed at equal intervals in the first plate-like member 2, a first cutout portion 9, a second cutout portion 12, and a connecting portion 912 are formed at equal intervals in the second plate-like member 8, and a first cutout portion 14, The second cutout portions 17 and connecting portions 1417 are formed at equal intervals, the first plate-shaped member 2, the second plate-shaped member 8, and the third plate-shaped member 13 engage with each other, and engaging portions 30, 31, and 32 are formed to form an equilateral triangle with the distance between each cutout portion as one side, and a leaf member 26 consisting of two fourth plate-shaped members 20 and one fifth plate-shaped member 23 is fitted inside this to form a three-dimensional structure.

Description

[Technical field]

[0001] The present invention relates to a method for joining a plurality of metal plate-like members and a three-dimensional structure formed by combining a plurality of metal plate-like members. [Background technology]

[0002] In Japan, there are traditional patterns that have been used since ancient times in arts and crafts such as textiles, ceramics, and interior decorations. Traditional patterns are understood to be Japanese designs that are patterned and arranged in a regular pattern. Representative traditional patterns include hemp leaves, hexagonal patterns, blue sea waves, and shippo. These traditional patterns have been used on kimonos, hand towels, sliding door paper, kumiko patterns on fittings, and decorations for festivals unique to each region, adding color to our lives.

[0003] Meanwhile, in various fields including civil engineering and construction, various three-dimensional structures such as truss structures and lattice structures that are constructed by combining tubular members such as wood, aluminum, and steel pipes, rod-shaped members, or plate-shaped members are used.

[0004] Patent Document 1 discloses a steel pipe truss having a steel pipe main member and diagonal members, etc., in which truss members can be securely joined using relatively simple, low-cost fastening fittings such as bolt joints, allowing the steel pipe truss to be constructed at low cost and the position of each node to be easily adjusted to ensure the accuracy of the entire truss. This steel pipe truss uses split-shaped connecting fittings at the truss nodes, which are made by dividing a sheath pipe made of a circular steel pipe of a specified length into several parts circumferentially.The connecting fittings are tightly bound to the outer periphery of the upper chord and lower chord to form friction connections, and the fastening flanges of these connecting fittings are used to bolt the ends of the diagonal members and other connecting members.

[0005] The plate material joining structure described in Patent Document 2 is a plate material joining structure using a first metal plate material 1, a second metal plate material 2, and a third metal plate material 3, in which the first plate material 1 has a plurality of first notches extending downward from the upper end when the plate material is long horizontally, the second plate material 2 has a plurality of paired notches extending downward from the upper end when the plate material is long horizontally, the paired notches being an upper notch extending downward from the upper end when the plate material is long horizontally and a lower notch extending upward from the lower end in the same line as the upper notch, the third plate material 3 has a plurality of third notches extending upward from the lower end when the plate material is long horizontally, the lower notches being fitted into each of the first notches to join the first plate body and the second plate body, and the third notches being fitted into each of the upper notches to join the first plate material 1, the second plate material 2, and the third plate material 3. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2004-293266 A [Patent Document 2] JP 2023-125475 A Summary of the Invention [Problem to be solved by the invention]

[0007] However, traditional patterns are primarily enjoyed by people enjoying the appearance of various types of patterns and understanding the meaning behind the origins of these patterns, and there has been no use of the traditional patterns themselves as three-dimensional structures in various fields, including civil engineering and construction.

[0008] The steel pipe truss disclosed in Patent Document 1 requires that metal fittings be friction-welded to the outer periphery of the main truss member, and that the ends of the secondary truss members be joined to the metal fittings. The task of joining such metal fittings to the outer periphery of the main truss member is generally considered difficult to control with regard to accuracy. In addition, the plate joining structure disclosed in Patent Document 2 has identical cuts made in each component and joins the components to form an equilateral triangle, but this pattern is not considered to be a traditional pattern.

[0009] Therefore, the present invention has been made in consideration of the above-mentioned circumstances, and aims to provide a method for joining plate-like members that can join plate-like members with high precision, and a three-dimensional structure formed by combining plate-like members. Another object of the present invention is to provide a method for joining structural members that can give the appearance of a three-dimensional structure a plurality of regularly arranged metallic structural members. [Means for solving the problem]

[0010] As a result of intensive research into achieving the above-mentioned object, the inventors discovered that the above problem could be solved by forming multiple types of cutout portions in metal plate-shaped members and then combining multiple of these metal plate-shaped members to form a three-dimensional structure, thereby completing the present invention.

[0011] That is, the present invention relates to a three-dimensional structure using a first plate-like member (2), a second plate-like member (8), and a third plate-like member (13) having the same plate thickness and height, in which the first plate-like member (2) has a first notch portion (2), a second notch portion (5), and a connecting portion (205) formed at equal intervals from the upper end to the lower end, the second plate-like member (8) has a first notch portion (9) formed at equal intervals from the lower end to the upper end, a second notch portion (12) formed at equal intervals from the upper end to the lower end, and a connecting portion (912) formed at equal intervals, the third plate-like member (13) has a first notch portion (14), a second notch portion (17), and a connecting portion (1417) formed at equal intervals from the lower end to the upper end, an engagement portion (30) in which the first notch portion (2), the second notch portion (12), and the connecting portion (1417) are engaged with each other; an engagement portion (31) in which the second notch portion (5), the connecting portion (912), and the second notch portion (17) are engaged with each other; and an engagement portion in which the connecting portion (205), the first notch portion (9), and the first notch portion (14) are engaged with each other. (32) is formed to form an equilateral triangle with one side corresponding to the distance between each of the notches in the first plate-like member (2), the second plate-like member (8), and the third plate-like member (13), and leaf members (26) consisting of two fourth plate-like members (20) and one fifth plate-like member (23) are fitted inside each equilateral triangle, thereby forming a three-dimensional structure using plate-like members. Effect of the Invention

[0012] The present invention provides a method for joining structural members that can join component members with high precision, and a three-dimensional structure formed by combining structural members.

[0013] The present invention also provides a method for joining structural members that can give the appearance of a three-dimensional structure a structure of regularly arranged structural members. [Brief description of the drawings]

[0014] [Figure 1] FIG. 1 is a diagram showing the hemp leaf pattern. [Diagram 2]FIG. 2 is a view showing a part of an engaged state of the plate material joining structure according to the first embodiment of the present invention. [Diagram 3] FIG. 3 shows a front view (a) and a perspective view (b) of the first plate-shaped member 1. [Figure 4] FIG. 4 shows the first cutout portion 2 as viewed from above in the depth direction. [Diagram 5] FIG. 5 shows the first cutout portion 5 as viewed from above in the depth direction. [Figure 6] FIG. 6 shows a front view (a) and a cross-sectional view (b) of the first plate-shaped member 1. [Figure 7] FIG. 7(a) shows a front view and (b) shows a perspective view of the second plate-shaped member 8. As shown in FIG. [Figure 8] FIG. 8 illustrates the first cutout portion 9 and the second cutout portion 12. As shown in FIG. [Figure 9] FIG. 9 shows a front view (a) and a cross-sectional view (b) of the second plate-shaped member 8. [Figure 10] FIG. 10 shows a front view (a) and a perspective view (b) of the third plate-shaped member 13. As shown in FIG. [Figure 11] FIG. 11 shows the first cutout portion 14 as viewed from below in the depth direction. [Figure 12] FIG. 12 shows the second cutout portion 17 as viewed from below in the depth direction. [Figure 13] FIG. 13 shows a front view (a) and a cross-sectional view (b) of the third plate-shaped member 13. [Figure 14] FIG. 14 shows a plan view and a side view of the fourth plate-shaped member 20 and the fifth plate-shaped member 25. As shown in FIG. [Figure 15] FIG. 15 illustrates the lengths in the left-right direction of the fourth plate-shaped member 20 and the fifth plate-shaped member 25 in a side view. [Figure 16] FIG. 16 shows a plan view and a perspective view of leaf member 26. [Figure 17]FIG. 17 shows a method for joining a three-dimensional structure made of plate-like members. [Figure 18] FIG. 18 shows a plan view of a three-dimensional structure of a plate-like member according to this embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiment described below.

[0016] (First embodiment) This embodiment describes a three-dimensional structure that uses a metal plate-like member 1 as a constituent member and imitates the hemp leaf pattern, which is one of the traditional patterns. The hemp leaf pattern is a pattern as shown in Figure 1, and is understood to be a pattern based on a star pattern formed by connecting the centers of gravity and each vertex of six equilateral triangles formed by the diagonals of a regular hexagon. In addition, the same reference numerals will be used in each drawing to refer to the same or equivalent parts. Furthermore, although there are some places where lengths are described, these lengths are merely examples to aid understanding, and are not limited to the lengths described therein. Furthermore, the term "same" does not limit things to being the same, but also includes things within a margin of error. If we were to give an example of a margin of error, we could give an example of about ±10 mm, but this margin of error is not limiting. In the description of the present invention, the metal plate-shaped member is arranged so that its longitudinal direction is the horizontal direction, and the horizontal direction is defined as the left-right direction and the vertical direction is defined as the up-down direction. Also, the thickness direction of the metal plate-shaped member is defined as the front direction and the back direction. More specifically, in Fig. 3, the horizontal direction in Fig. 3(a) is the left-right direction, the vertical direction is the up-down direction, and the thickness direction in Fig. 3(b) is the front direction and the back direction.

[0017] (Metal plate-shaped member) The material of the metal plate-like member that can be used in this embodiment is not particularly limited as long as it is made of metal, and examples thereof include steel pipes made of carbon steel, stainless steel, or alloys, aluminum pipes made of aluminum alloys, and copper pipes made of pure copper, copper alloys, and the like.

[0018] (Three-dimensional structure of plate-like member) 2 is a diagram showing a part of an engaged state of a first embodiment of a three-dimensional structure of plate material members according to the present invention. The three-dimensional structure of plate material members is formed by engaging a first plate member 1, a second plate member 8, and a third plate member 13, which are metal plate members having the same thickness (plate thickness) and the same height, with each other. Next, although not shown in Figure 2, two fourth plate-shaped members 20 and one fifth plate-shaped member 23 are combined (hereinafter sometimes referred to as leaf members) and engaged with the inside of the equilateral triangle formed by the first plate-shaped member 2, the second plate-shaped member 8 and the third plate-shaped member 13. In the first embodiment, the first plate-shaped member 1, the second plate-shaped member 8, the third plate-shaped member 13, the fourth plate-shaped member and the fifth plate-shaped member 23 have a thickness of about 3 mm and a height of about 75 mm.

[0019] (First plate-shaped member 1) The first plate-shaped member 1 will be described with reference to Fig. 3. Fig. 3 shows a front view (a) and a perspective view (b) of the first plate-shaped member 1. 3(a) and 3(b), a first notch 2 and a second notch 5 are formed continuously from the upper end to the lower end of the first plate-like member 1. The first notch 2 and the second notch 5 are formed at equal intervals in the left-right direction at the upper end of the first plate-like member 1.

[0020] The vertical lengths of the first cutout portion 2 and the second cutout portion 5 are both 1 / 3 of the vertical length of the first plate-like member 1. By setting them to such lengths, the first plate-like member 1, the second plate-like member 8, and the third plate-like member 13 are engaged flush with each other.

[0021] The first cutout portion 2 will be described in detail with reference to Fig. 4. Fig. 4 shows the first cutout portion 2 as viewed from above in the depth direction. The first cutout portion 2 is composed of a left cutout portion 3 and a right cutout portion 4 . The cutout left side 3 is formed so that the angle between the side 2A1 connecting the vertices 2a1 and 2b1 and the side 2B1 connecting the vertices 2c1 and 2b1 is 120°. The sides 2A1 and 2B1 are also formed to have the same length. Therefore, a triangle with the vertices 2a1, 2b1, and 2c1 as its vertices is an isosceles triangle. The distance between the vertices 2a1 and 2c1 is the same as the thickness of the first plate-like member, and the vertex 2b1 is on the center line Y of the first plate-like member 1.

[0022] The cutout right side 4 is formed so that the angle between the side 2A2 connecting the vertices 2a2 and 2b2 and the side 2B2 connecting the vertices 2c1 and 2b1 is 120°. In addition, the sides 2A2 and 2B2 are formed to have the same length. Therefore, a triangle with the vertices 2a2, 2b2, and 2c2 as vertices is an isosceles triangle, and the vertex 2b2 is on the center line Y of the first plate-like member 1. The distance between the vertices 2a2 and 2c2 is the same as the thickness of the first plate-like member. Moreover, the vertices of the left side 3 of the cutout and the vertices of the right side 4 of the cutout correspond to each other and are formed symmetrically.

[0023] The distance between the apex 2b1 and the apex 2b2 is the distance obtained by adding the length of the clearance α in the left and right directions to the thickness X of the second plate-like member 2 in order to engage the second plate-like member 2 and the third plate-like member 13. The length of the clearance α depends on the thickness of each plate-like member, but when the thickness is about 3 mm, it is preferably about 0.2 to 0.4 mm. Therefore, when the thickness is about 3 mm, the distance between the apex 2b1 and the apex 2b2 is about 3.4 mm to 3.8 mm. Alternatively, the clearance α may be within a range of approximately 1 / 25 to 1 / 15 of the thickness X. The second plate-shaped member can be engaged with the first plate-shaped member 1 while taking into consideration variations in the thickness of the plate-shaped members and fluctuations in the processing accuracy of the plate-shaped members.

[0024] The second cutout portion 5 will be described in detail with reference to Fig. 5. Fig. 5 shows the first cutout portion 5 as viewed from above in the depth direction, assuming that there is no portion corresponding to the first cutout portion 2. The second cutout portion 5 is composed of a left cutout portion 6 and a right cutout portion 7 . A side 5A1 connecting vertices 5a1 and 5b1 is formed on cutout left side 6. On the other hand, a side 5A2 connecting vertices 5a2 and 5b2 is formed on cutout right side 7. Sides 5A1 and 5A2 are formed parallel to each other and at an angle of 60° to the right. Furthermore, the length between sides 5A1 and 5A2 is formed to be the same as the distance between the above-mentioned point 2b1 and vertex 2b2 in order to engage the second plate-shaped member 8 and the third plate-shaped member 13 with the second cutout portion 5.

[0025] FIG. 6 shows a front view (a) and a cross-sectional view (b) of the first plate-shaped member 1. As shown in FIG. 6(a), the first plate-like member 1 has a first cutout portion 2, a second cutout portion 5 and a connecting portion 205 formed continuously from the upper end to the lower end. Therefore, as shown in FIG. 6(b), a cross-sectional view of the first cutout portion 2 and a cross-sectional view of the second cutout portion 5 have different shapes. Further, the first cutout portion 2, the second cutout portion 3 and the connecting portion (205) are formed at equal intervals in the left-right direction on the upper end of the first plate-like member 1. Also, the number of first cutout portions 2 and second cutout portions 5 in the first plate-like member 1 can be set as appropriate. Furthermore, the shape of the end portion can also be set as appropriate. That is, it is possible to form a plurality of first plate-like members 1 so as to be continuous in the left-right direction, or to form the end portion of the joining structure of the plate-like members without providing a cutout portion at the end portion.

[0026] (Second plate-shaped member 8) The second plate-shaped member 8 will be described with reference to Fig. 7. Fig. 7 shows a front view (a) and a perspective view (b) of the second plate-shaped member 8. 7(a) and 7(b), a first notch 9 extending from the lower end to the upper end and a second notch 12 extending from the upper end to the lower end are formed in the second plate-like member 8. The first notch 9 and the second notch 12 are formed at equal intervals in the left-right direction on the upper end of the first plate-like member 1, and are formed at corresponding positions in the up-down direction.

[0027] The vertical lengths of the first cutout portion 9 and the second cutout portion 12 are both 1 / 3 of the vertical length of the second plate-like member 8. By setting them to such lengths, the first plate-like member 1, the second plate-like member 8 and the third plate-like member 13 are engaged flush with each other.

[0028] The first cutout portion 9 will be described in detail with reference to Fig. 8(a). Fig. 8(a) shows the first cutout portion 9 as viewed from below in the depth direction. The first cutout portion 9 is composed of a left cutout portion 10 and a right cutout portion 11 . A side 9A1 connecting vertices 9a1 and 9b1 is formed on the left side 10 of the cutout, while a side 9A2 connecting vertices 9a2 and 9b2 is formed on the right side 11 of the cutout. Sides 9A1 and 9A2 are formed parallel to each other and at an angle of 60° to the right. Furthermore, the length between sides 9A1 and 9A2 is formed to be equal to the distance between the aforementioned point 2b1 and vertex 2b2 in order to engage the first plate-shaped member 1 and the third plate-shaped member 13 with the second cutout portion 9.

[0029] The second cutout portion 12 will be described in detail with reference to Fig. 8(b) in which the second cutout portion 12 is seen from above in the depth direction. The second cutout portion 12 is composed of a left cutout portion side 121 and a right cutout portion side 122 . A side 12A1 connecting vertices 12a1 and 12b1 is formed on cutout left side 13. On the other hand, a side 12A2 connecting vertices 12a2 and 12b2 is formed on cutout right side 14. Sides 12A1 and 12A2 are formed parallel to each other and at an angle of 120° to the right. Furthermore, the length between sides 12A1 and 12A2 is formed to be equal to the distance between the aforementioned point 2b1 and vertex 2b2 in order to engage the first plate-shaped member 1 and the third plate-shaped member 13 with the second cutout portion 12.

[0030] FIG. 9 shows a front view (a) and a cross-sectional view (b) of the second plate-shaped member 8. As shown in Fig. 9(a), the second plate-like member 8 has a first cutout 9 extending from the lower end to the upper end, a second cutout 12 extending from the upper end to the lower end, and a connecting portion 912 between these cutouts. The first cutout 9 is formed parallel to the right at an angle of 120°. Meanwhile, the second cutout 12 is formed parallel to the right at an angle of 60°. Further, the first cutout portion 9, the second cutout portion 12 and the connecting portion (912) are formed at equal intervals in the left-right direction on the lower end of the second plate-like member 8. Furthermore, as can be seen from the cross-sectional views of the first cutout portion 9 and the second cutout portion 12, the respective cutout portions are formed to be symmetrical on the left and right. Also, the number of first notches 9 and second notches 12 in the second plate-like member 8 can be set as appropriate. Furthermore, the shape of the end can also be set as appropriate. That is, it is possible to form a plurality of second plate-like members 8 so as to be continuous in the left-right direction, or it is possible to form the end of the joining structure of the plate-like members without providing a notch at the end.

[0031] (Third plate-shaped member 13) The third plate-shaped member 13 will be described with reference to Fig. 10. Fig. 10 shows a front view (a) and a perspective view (b) of the third plate-shaped member 13. As shown in Figures 10(a) and 10(b), the third plate-like member 13 has a first notch 14 and a second notch 17 formed continuously from the lower end to the upper end. The first notch 14 and the second notch 17 are formed at equal intervals in the left-right direction at the lower end of the third plate-like member 13. The first notch 14 and the second notch 17 formed in the third plate-like member 13 and the first notch 2 and the second notch 5 formed in the first plate-like member 1 have the same shape.

[0032] The vertical lengths of the first cutout portion 14 and the second cutout portion 17 are both 1 / 3 of the vertical length of the third plate-like member 13. By setting them to such lengths, the first plate-like member 1, the second plate-like member 8 and the third plate-like member 13 are engaged flush with each other.

[0033] The first cutout portion 14 will be described in detail with reference to Fig. 11. Fig. 11 shows the first cutout portion 14 as viewed from below in the depth direction. The first cutout portion 14 is composed of a left cutout portion 15 and a right cutout portion 16 . The cutout left side 15 is formed so that the angle between the side 14A1 connecting the vertices 14a1 and 14b1 and the side 14B1 connecting the vertices 14c1 and 14b1 is 120°. The sides 14A1 and 14B1 are also formed to have the same length. Therefore, a triangle with the vertices 14a1, 14b1, and 14c1 as its vertices is an isosceles triangle. The distance between the vertices 14a1 and 14c1 is the same as the thickness of the third plate-like member 13, and the vertex 2b1 is located on the center line Y of the first plate-like member 1.

[0034] The cutout right side 16 is formed so that the angle between the side 14A2 connecting the vertices 14a2 and 14b2 and the side 14B2 connecting the vertices 14c1 and 14b1 is 120°. The sides 14A2 and 14B2 are formed to have the same length. Therefore, the triangle with the vertices 14a2, 14b2, and 14c2 as vertices is an isosceles triangle. The distance between the vertices 14a2 and 14c2 is the same as the thickness of the third plate-like member 13, and the vertex 14b2 is located on the center line Y of the third plate-like member 13. Moreover, the vertices of the left side 15 of the cutout and the vertices of the right side 16 of the cutout correspond to each other and are formed symmetrically.

[0035] The distance between apex 14b1 and apex 14b2 is the thickness X of second plate-like member 8 plus the length of clearance α in the left and right directions in order to engage first plate-like member 1 and second plate-like member 8. The length of clearance α depends on the thickness of each plate-like member, but when the thickness is about 3 mm, it is preferably about 0.2 to 0.4 mm. Therefore, when the thickness is about 3 mm, the distance between apex 14b1 and apex 14b2 is about 3.4 mm to 3.8 mm. Alternatively, the clearance α may be within a range of approximately 1 / 25 to 1 / 15 of the thickness X. The third plate-like member 13 can be engaged with the second plate-like member 8 while taking into consideration variations in the thickness of the plate-like members and fluctuations in the processing accuracy of the plate-like members. It should be noted that the distance between vertices 14b1 and 14b2 is the same as the distance between vertices 2b1 and 2b2.

[0036] The second cutout portion 17 will be described in detail with reference to Fig. 12. Fig. 12 shows the second cutout portion 17 as viewed from below in the depth direction, assuming that there is no portion corresponding to the first cutout portion 14. The second cutout portion 17 is composed of a cutout left side portion 18 and a cutout right side portion 19. Also, cutout left side portion 18 has a side 17A1 connecting vertices 17a1 and 17b1. Meanwhile, cutout right side portion 19 has a side 17A2 connecting vertices 17a2 and 17b2. Sides 17A1 and 17A2 are formed parallel to each other and at an angle of 120° to the right. Furthermore, the length between sides 17A1 and 17A2 is formed to be equal to the distance between point 2b1 and vertex 2b2 described above in order to engage first plate-like member 1 and second plate-like member 13 with second cutout portion 17.

[0037] FIG. 13 shows a front view (a) and a cross-sectional view (b) of the third plate-shaped member 13. As shown in FIG. 13(a), the third plate-like member 13 has a first cutout portion 14, a second cutout portion 17 and a connecting portion (1417) formed continuously from the lower end to the upper end. Therefore, as shown in FIG. 13(b), a cross-sectional view of the first cutout portion 14 and a cross-sectional view of the second cutout portion 17 have different shapes. Moreover, the first cutout portion 14, the second cutout portion 17 and the connecting portion (1417) are formed at equal intervals in the left-right direction on the lower end of the first plate-like member 13. Also, the number of first notches 14 and second notches 17 in the third plate-like member 13 can be set as appropriate. Furthermore, the shape of the end can also be set as appropriate. That is, it is possible to form a plurality of first plate-like members 13 so as to be continuous in the left-right direction, or to form the end of the joining structure of the plate-like members without providing a notch at the end.

[0038] (Fourth plate-shaped member 20 and fifth plate-shaped member 23) The fourth plate-shaped member 20 and the fifth plate-shaped member 23 will be described with reference to Fig. 14. Fig. 14 shows a plan view (a) and a side view (b) of the fourth plate-shaped member 20 and the fifth plate-shaped member 23. Furthermore, two of the fourth plate-like members 20 and one of the fifth plate-like members 23 are joined together to create leaf members 26. The leaf members 26 are plate-like members used to fit into the interiors of the equilateral triangles formed by the first plate-like member 2, the first plate-like member 8, and the third plate-like member 13, as shown in FIG. 14(a), a notch 21 is formed at the left end of the fourth plate-like member 20, which is made up of a side 20A connecting the vertices 20a1 and 20a2. The side 20A has an angle of 30° with respect to the left. Meanwhile, a tip 22 is formed at the right end of the fourth plate-like member 20, such that the angle between the side 20B1 connecting the vertices 20b1 and 20b2 and the side 20B2 connecting the vertices 20b3 and 20b2 is 60°.

[0039] 14(b), a tip portion 24 is formed at the left end of the fifth plate-like member 23 such that an angle between a side 23A1 connecting the vertices 23a1 and 23a2 and a side 23A2 connecting the vertices 23a3 and 23a2 is 120°. Meanwhile, a tip portion 25 is formed at the right end of the fifth plate-like member 23 such that an angle between a side 23B1 connecting the vertices 23b1 and 23b2 and a side 23B2 connecting the vertices 23b3 and 23b2 is 60°.

[0040] The plate thickness and vertical length, i.e., the height length, of the fourth plate-like member 20 and the fifth plate-like member 23 are the same as the height lengths of the first plate-like member 1, the second plate-like member 8, and the third plate-like member 13. By making the height lengths the same, they can be engaged flush. Also, by making the thickness the same, the thickness of all the plate-like members can be made uniform, and a sense of unity can be imparted to the three-dimensional structure of the plate-like members.

[0041] The length of the fourth plate-shaped member 20 in the left-right direction in a side view will be described. First, as a premise, since the tip portion 22 of the fourth plate-shaped member 20 has an angle of 60°, the tip portion 22 can be fitted into the apex of an equilateral triangle formed by the first plate-shaped member 2, the second plate-shaped member 8, and the third plate-shaped member 13. As shown in Fig. 15, one fourth plate-like member 20 and the other fourth plate-like member 20 are arranged so that their angle between 20a1 and 20a1 is 120°. The length from this arranged position that allows the tip 22 of the fourth plate-like member 20 to fit into the apex of the equilateral triangle is defined as the left-right length in the side view of the fourth plate-like member 20. This length coincides with the left-right length in the side view in Fig. 14(a).

[0042] The length of the fifth plate-shaped member 23 in the left-right direction in a side view will be described. First, as a premise, the tip 24 of the fifth plate-like member 23 has an angle of 120°. Then, the fifth plate-like member 23 can be disposed on the opposite side to the side where 20a1 of one fourth plate-like member 20 and 20a1 of the other fourth plate-like member 20 are disposed at an angle of 120°. In addition, since the tip portion 25 of the fifth plate-shaped member 23 has an angle of 60°, the tip portion 25 can be fitted into the apex of an equilateral triangle formed by the first plate-shaped member 2, the second plate-shaped member 8, and the third plate-shaped member 13. The fifth plate-shaped member 23 is disposed so that its left-right length in the side view, i.e., the apex 23b2 of the tip portion 25, does not contact the intersection between 20a1 of one fourth plate-shaped member 20 and 20a1 of the other fourth plate-shaped member 20. That is, it is disposed so that there is a clearance β between the apex 23b2 of the tip portion 25 and the intersection. In other words, the left-right length in the side view of the fifth plate-shaped member 23 is shorter than the left-right length in the side view of the fourth plate-shaped member 20 by the length of the clearance β. Here, the clearance β is set in relation to the clearance α so as to be within the range of the following formula 1. (Formula 1) α<β<3α By setting the clearance β within the above range, it becomes possible to fit the leaf members 26 inside the equilateral triangle while taking into account variations in the thickness of the plate-shaped members and variations in the processing accuracy of the plate-shaped members. If the clearance β exceeds 3α, the lengths of the two fourth plate-shaped members 20 and the fifth plate-shaped member 23 will differ even to the naked eye, and the leaf members may be unbalanced. The length in the left-right direction in the side view of the fifth plate-shaped member 23 coincides with the length in the left-right direction in the side view in Fig. 14(b). The leaf members 26 may be joined by welding the fourth plate-shaped member 20 and the fifth plate-shaped member 23 at their center points.

[0043] (Method for joining three-dimensional structures of plate-like members) As shown in Figure 17(a), each first cutout portion 9 of the second plate-shaped member 8 is inserted through each first cutout portion 2 of the first plate-shaped member 1, and each first cutout portion 9 of the second plate-shaped member 8 is engaged with each second cutout portion 5 of each first plate-shaped member, thereby engaging the second plate-shaped member 8 with the first plate-shaped member 1.

[0044] FIG. 17(b) shows a state in which the first plate-shaped member 1 and the second plate-shaped member 8 are engaged with each other. As can be seen from Figure 17(b), by engaging the first plate-shaped member 1 and the second plate-shaped member 8, each first cutout portion 2 in the first plate-shaped member 1 and each second cutout portion 12 in the second plate-shaped member 8 overlap to form a cutout portion 27. In addition, the second cutout portion 5 in the first plate-shaped member 1 and a connecting portion 912 between the first cutout portion 9 and the second cutout portion 12 in the second plate-shaped member 8 engage with each other to form an engagement portion 28. Furthermore, the connecting portion 25 of the first plate-like member 1 and the first cutout portion 9 of the second plate-like member 8 engage with each other to form an engagement portion 29 .

[0045] Next, the first notch portion 14 in the third plate-shaped member 13 is inserted into the notch portion 27, and the first notch portion 14 in the third plate-shaped member 13 is engaged with the engagement portion 29, and the second notch portion 17 in the third plate-shaped member is engaged with the engagement portion 28. Additionally, the connecting portion 1417 of the third plate-like member 13 and the notch portion 27 are engaged with each other.

[0046] As described above, by engaging the third plate-shaped member 13 with the first plate-shaped member 1 and the second plate-shaped member 8, an engagement portion 30 is formed which is composed of each of the first cutout portions 2 in the first plate-shaped member 1, each of the second cutout portions 12 in the second plate-shaped member 8, and the connecting portion 1417 in the third plate-shaped member 13. In addition, an engagement portion 31 is formed by each second cutout portion 5 in the first plate-shaped member 1, each connecting portion 912 in the second plate-shaped member 8, and the second cutout portion 17 in the third plate-shaped member 13. Furthermore, an engagement portion 32 is formed by each connecting portion 205 in the first plate-shaped member 1, each first cutout portion 9 in the second plate-shaped member 8, and each first cutout portion 14 in the third plate-shaped member 13. Furthermore, although not shown, a clearance α is exposed at each of the engagement portions 30 to 32.

[0047] By engaging the first plate-shaped member 1, the second plate-shaped member 8 and the third plate-shaped member 13, an equilateral triangle is formed with one side corresponding to the distance between the cutouts in each plate-shaped member.

[0048] Next, the leaf member 26 is fitted into the inside of the equilateral triangle formed by the first plate-shaped member 1, the second plate-shaped member 8 and the third plate-shaped member 13, thereby joining the three-dimensional structure of the plate-shaped members. The leaf members may be formed by fitting two fourth plate-shaped members 20 and one fifth plate-shaped member inside an equilateral triangle, or the fourth plate-shaped member 20 and the fifth plate-shaped member 23 may be joined in advance by welding or the like to form a leaf member, which is then fitted into the equilateral triangle.

[0049] FIG. 18 shows a plan view of a three-dimensional structure of plate-like members according to this embodiment obtained by the above-described joining method.

[0050] The three-dimensional structure according to this embodiment can be used as general furniture, store fixtures, general and store building interior materials, general and store exterior building exterior materials, decorative materials such as entrance doors, fences, decorative blocks, walls, and other decorative materials. In addition, since it is made of metal plate-shaped members, it has excellent durability, fire resistance, weight resistance, and earthquake resistance.

[0051] 1 First plate-like member 2 First notch 3 Left side of notch 4 Right side of notch 5 Second notch 6 Notch left side 7 Right side of notch 8 Second plate-like member 9 First notch 10 Notch left side 11 Notch right side 12 Second notch 121 Notch left side 122 Notch right side 13 Second plate-like member 14 First notch 15 Notch left side 16 Notch right side 17 Second notch 18 Notch left side 19 Notch right side 20 Fourth plate-shaped member 21 Notch 22 Tip 23 Fifth plate-shaped member 24 Tip 25 Tip 26 Leaf member 27 Notch 28 Engagement part 29 Engagement part 30 Engagement part 31 Engagement part 32 Engagement part

Claims

1. A three-dimensional structure using a first plate-like member (2), a second plate-like member (8), and a third plate-like member (13) having the same plate thickness and height, The first plate-like member (2) has a first notch portion (2), a second notch portion (5), and a connecting portion (205) formed at equal intervals from the upper end to the lower end, The second plate-like member (8) is formed with a first notch portion (9) extending from the lower end to the upper end, a second notch portion (12) extending from the upper end to the lower end, and a connecting portion (912) at equal intervals; The third plate-like member (13) has a first notch portion (14), a second notch portion (17), and a connecting portion (1417) formed at equal intervals from the lower end to the upper end, The first plate-like member (2), the second plate-like member (8), and the third plate-like member (13) are engaged with each other, an engagement portion (30) in which the first notch portion (2), the second notch portion (12), and the connecting portion (1417) are engaged; an engagement portion (31) in which the second cutout portion (5), the connecting portion (912), and the second cutout portion (17) are engaged with each other; A connecting portion (205), a first notch portion (9), and an engagement portion (32) in which the first notch portion (14) are engaged with each other are formed, An equilateral triangle is formed with one side being the distance between the respective cutouts in the first plate-like member (2), the second plate-like member (8), and the third plate-like member (13), A three-dimensional structure using plate-shaped members, in which leaf members (26) consisting of two fourth plate-shaped members (20) and one fifth plate-shaped member (23) are fitted inside each of the equilateral triangles.

2. The first cutout portion (2) is composed of a cutout left side portion (3) and a cutout right side portion (4), The left side of the cutout (3) and the right side of the cutout (4) form an isosceles triangle with an apex of 120°. The second cutout portion (5) is composed of a cutout left side portion (6) and a cutout right side portion (7), The left side (6) of the notch and the right side (7) of the notch are formed parallel to each other at an angle of 60° to the right. The first cutout portion (9) is composed of a cutout left side portion (10) and a cutout right side portion (11), The left side (10) of the notch and the right side (11) of the notch are formed in parallel at an angle of 60° to the right, The second cutout portion (12) is composed of a cutout left side portion (121) and a cutout right side portion (122), The left side (121) of the notch and the right side (122) of the notch are formed in parallel at an angle of 120° to the right, The first cutout portion (14) is composed of a cutout left side portion (15) and a cutout right side portion (16), The left side of the cutout (15) and the right side of the cutout (16) form an isosceles triangle with an apex of 120°, The second cutout portion (17) is composed of a cutout left side portion (18) and a cutout right side portion (19), 2. A three-dimensional structure using a plate-like member according to claim 1, wherein the left side (18) of the cutout and the right side (19) of the cutout are formed in parallel at an angle of 120° to the right.

3. A notch 21 is formed at the left end of the fourth plate-like member (20) at an angle of 30° to the left, The fourth plate-like member (20) has a tip portion (22) at the right end thereof, the tip portion having a 60° apex. The fifth plate-like member (23) has a tip (24) at the left end thereof, the tip (24) having a vertex at 120°.

3. A three-dimensional structure using plate-like members according to claim 1 or 2, wherein a tip portion (25) having an apex angle of 60° is formed at a right end portion of the fifth plate-like member (23).

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