JP7177312B2 - Method for joining frame for dome-shaped structure - Google Patents

Description

The present invention relates to a method for joining frameworks for dome-shaped structures.

Conventionally, there are regular polyhedral or semi-regular polyhedral dome-shaped structures. For example, a truncated icosahedron of a semi-regular polyhedron, called a geodesic dome (Fuller dome), is subdivided into triangles that are close to equilateral triangles while maintaining symmetry as much as possible, and the sphere is geodesic or lines approximating the geodesic. There are also domes that are composed of a collection of pieces, especially those that are constructed by arranging a number of homogeneous structural members in such a structure. A dome-shaped structure formed by a truss structure is easy to construct in construction, but regardless of the members that make up it, the dome-shaped structure itself is lightweight and secures a certain amount of strength. can do.

JP 2014-66114 A

In order to form a dome-shaped structure, it is necessary to angle the joints of the sides of the truss structure. There are various methods for forming a dome-shaped structure using a skeletal member.
(a) A method in which the framework members are superimposed on the joints of the intersecting sides and fixed at points, (b) A method in which the intersecting joints are cut at the angle of the vertices where the sides are divided, and the framework members are fixed by faces. A conceivable method is to replace the vertex of the joint with a joint member. (A) assumes that the thickness of the frame member overlaps by six. When the thickness of the overlap is increased, the distance from the center of the dome and the distance of the side from the joint point differ depending on the order in which the frame members are stacked. Therefore, it does not result in an accurate dome. In the case of the geodesic dome (FIG. 7) (b), the 5 joints consist of 10 joint surfaces, and the 6 joint surfaces consist of 12 joint surfaces (FIG. 8). The more joint surfaces there are, the easier it is for deviations and errors to occur. It takes time to join the 12 faces without deviation during construction. For (C), refer to Patent Document 1 (FIGS. 5 ^to 7). It is conceivable that the frame members are fixed to the holes in 73a, 74a, and 75a. The accuracy of 73, 74 and 75 is high, but considering that the roots of 73a, 74a and 75a are joined at an angle, the accuracy depends on the manufacture of the connector member itself. Alternatively, it is not easy to manufacture the connector.

The present invention relates to a method for joining a frame for a dome-shaped structure comprising joint members, columnar members attached to the joint members, and frame members in contact with the columnar members, wherein the joint members are A polygonal main body which is in the shape of a thick plate and has an outer edge having a plurality of linear side portions, and a plurality of radially outwardly protruding portions of a predetermined length from the side portions of the polygonal main body. the rectangular portion is bent with respect to the polygonal body portion by a predetermined angle α along the plate thickness direction of the polygonal body portion, and the skeleton member is long, Cut surfaces are formed at both ends, and the cut surfaces are inclined by (90°-α) with respect to the axis along the longitudinal direction of the skeleton member, and the cut surfaces include the A notch having a depth direction along the longitudinal direction of the skeleton member is formed, and the depth of the notch is equal to the predetermined length of the rectangular portion. With the end face of the member fixed in contact with at least one of the front surface and the rear surface of the polygonal body portion of the joining member, the side peripheral surface of the cylindrical member is inserted into the cut portion to form the frame. It is in line contact with the cut surface of the member, and the joining member and the joining member are arranged so that at least one of the front surface and the back surface of the polygonal body portion of the joining member and one end surface of the cylindrical member are in contact. After joining the columnar member, the rectangular portion of the joining member is inserted into the cut portion of the frame member, and the cut surface of the frame member and the side peripheral surface of the columnar member are brought into line contact to join the frame member and the frame member. A method for joining a frame for a dome-shaped structure, characterized by joining joint members.

The joint member, which consists of a polygon and a rectangle projecting from it, is attached to a plate-shaped material with a certain thickness by bending the inner angle of the polygon, so the reproducibility and productivity of the joint member are improved. , mass production becomes possible. By fixing the frame member at the position where the cut surface of the frame member contacts the side peripheral surface of the cylindrical member, it becomes possible to easily attach the frame member at an accurate and uniform position up to the vertex of the joint point with the frame member. The length of the sides in the polyhedral structure of the member can be made uniform. In addition, by sandwiching the frame member between the rectangular portions, a double friction structure is obtained, increasing the rigidity. We ensure the accuracy of the dome-shaped structure assembled by this construction method as a regular polyhedron and a semi-regular polyhedron. Sides shared by polygons and rectangles of joint members that are bent to form an angle are most likely to be subjected to a load. For example, if a strong wind blows from the outside and a load is applied, there is a possibility that this part will be damaged. However, the load is transmitted to the frame member by the linear contact of the frame member with the cylindrical member, and the force is dispersed. The structure is strong against both external and internal loads. This joining part allows ease of construction in the construction of domed structures. In addition, since it is possible to attach and detach by releasing the fixation, the joining method can be easily dismantled.

Front view of a frame for a dome-shaped structure according to an embodiment Plan view of the joint member according to the embodiment Longitudinal cross-sectional view of a joint member according to an embodiment Enlarged view and vertical cross-sectional view of the vicinity of the joint part according to the embodiment FIG. 5 is a partially enlarged vertical cross-sectional view explaining that the frame member and the cylindrical member according to the embodiment are in line contact; Perspective view of the periphery of the joint according to the embodiment Diagram explaining conventional technology (b) Diagram explaining conventional technology (b)

When constructing a dome-shaped structure with a diameter of 6 m and a size of 3 v (a hemisphere with 165 sides), a polygon with a long side of 70 mm, which shares one side with a polygon, projects radially. A member is cut out from a 2 mm thick stainless steel plate, bent so that the side shared by the polygon and the rectangle is 156 degrees, and a hole of 10 mm in diameter for attachment is made in each rectangular part. In order to cut a cylindrical member having a diameter of 84 mm and a thickness of 32 mm whose radius is a line segment drawn from the center of the polygon of the plate-shaped member perpendicular to the side of the polygon and attach it to the plate-shaped member, A 10 mm hole is drilled in the dome outer mounting cylinder and a 17 mm hole in the dome inner mounting cylinder. A high nut for inserting bolts and nuts from both sides is installed inside the member, and the outer cylindrical member is fixed with the bolt and the high nut. Insert the dome inner mounting cylinder into the high nut and fix it with the bolt and high nut from the inside to the outside. Bolts are inserted into the high nut from both directions. 165 skeleton members are made by cutting both ends of a piece of wood, which will be a skeleton member, at 70 mm and cutting both ends at an angle of 78 degrees. At both ends, a pawl nut is attached to fix the rectangular part of the member with an 8 mm bolt. The rectangular portion is sandwiched between the notches in the frame member, attached to the side peripheral surface of the cylindrical member at a position where the cut surface of the frame member is in line contact, and fixed with an 8 mm bolt.

As shown in FIG. 1, the dome-shaped structural framework 1 includes joint members 10, 11, and 12, which are also called plate-shaped members, a cylindrical member 20 attached to the joint members 10, 11, and 12, and a skeleton member 30 that abuts against and contacts the cylindrical member 20 .

As shown in FIG. 2 and the like, the joining members 10, 11, and 12 are plate-shaped with a certain thickness, and have a plurality of linear side portions 41 at the central portions of the joining members 10, 11, and 12. It comprises a polygonal body portion 51 having an outer edge and having a generally polygonal shape. A plurality of rectangular portions 61 are formed radially outwardly from the side portions 41 of the polygonal main body portion 51 with a predetermined length.

In this embodiment, the joint members 10, 11, and 12 are composed of the hexagonal joint member 10 having a substantially hexagonal polygonal body portion 51 and six rectangular portions 61, and the substantially pentagonal polygonal body portion 51 and five rectangular portions 61. and an edge joint member 12 comprising a substantially pentagonal polygonal body portion 51 and four rectangular portions 61 .

The length of the side portion 41 of each joint member 10, 11, 12 is approximately 35 mm, and the projection length of the rectangular portion 61 is approximately 70 mm.

Furthermore, as shown in FIG. 3, the rectangular portion 61 is bent at a predetermined angle α=24 degrees along the thickness direction of the polygonal main body portion 51 with respect to each polygonal main body portion 51 . That is, when the polygonal main body 51 and the rectangular portion 61 are connected linearly to 180 degrees, the side portion 41 is bent by β=(180−α) degrees=156 degrees.

The skeleton member 30 is elongated with a length of about 1119 mm, and cut surfaces 71 are formed at both ends. As shown in FIGS. 4 and 5, the cut surface 71 is γ=(β-90) degrees=(180-α-90) degrees=(90-α ) = tilted by 66 degrees.

The inclination angle γ is equal to half of the internal angle of the polyhedron formed by the skeleton members 30 in the dome-shaped structural framework 1 .

Further, the cutting surface 71 is formed with a cut portion 81 whose depth direction is the longitudinal direction of the skeleton member 30 . The depth of the notch 81 is equal to the overhanging length of the rectangular portion 61 and is approximately 70 mm.

Further, as shown in FIG. 4 and the like, the cylindrical member 20 has a cylindrical shape whose cross section is a circle inscribed in the plurality of side portions 41 of the joint members 10 , 11 , 12 . As a result, the cylindrical member 20 is in a state in which the end surfaces of the cylindrical member 20 are in contact with the front surface and the back surface of the polygonal body portions 51 of the joining members 10, 11, and 12 one by one, and the side peripheral surface of the cylindrical member 20 is The rectangular portion 61 is in line contact with the cut surface 71 of the skeleton member 30 inserted into the cut portion 81 .

When joining the dome-shaped structural framework 1, the joint members 10, 11 are first joined so that the front and back surfaces of the polygonal body portion 51 of the joint members 10, 11, 12 and one end surface of the cylindrical member 20 are in contact with each other. , 12 and the cylindrical member 20 are joined.

After that, the rectangular portions 61 of the joint members 10, 11, and 12 are inserted into the cut portions 81 of the skeleton member 30, and the cut surface 71 of the skeleton member 30 and the side peripheral surface of the cylindrical member 20 are brought into line contact with each other. and the joining members 10, 11, 12 are joined.

Here, when joining each member, as shown in FIG.

It should be noted that the predetermined angle α and the length of the frame member 30 can be applied in various ways according to the shape, size, etc. of the frame for the dome-shaped structure to be constructed.

1 Frames for Dome-shaped Structures 10, 11, 12 Joining Member 20 Cylindrical Member 30 Skeleton Member 41 Side Part 51 Polygonal Body Part 61 Rectangular Part 71 Cut Surface 81 Cut Part α Predetermined Angle

Claims (1)

A method for joining a frame for a dome-shaped structure comprising a joining member, a columnar member attached to the joining member, and a frame member in contact with the columnar member, the method comprising:
The joining member is a plate having a certain thickness,
a polygonal main body portion having an outer edge portion having a plurality of linear side portions;
a plurality of rectangular portions projecting radially outward from the side portions of the polygonal body portion with a predetermined length;
The rectangular portion is bent with respect to the polygonal body portion by a predetermined angle α along the plate thickness direction of the polygonal body portion,
The skeletal member is long and has cut surfaces formed at both ends,
The cut surface is inclined by (90°-α) with respect to the axis along the longitudinal direction of the skeleton member, and the cut surface has the longitudinal direction of the skeleton member as the depth direction. a notch is formed, and the depth of the notch is equal to the predetermined length of the rectangular portion;
The cylindrical member has an end surface fixed in contact with at least one of the front surface and the back surface of the polygonal body portion of the joining member, and the side peripheral surface of the cylindrical member is in contact with the rectangular portion. It is in line contact with the cut surface of the skeleton member inserted into the part,
After joining the joint member and the cylindrical member so that at least one of the front surface and the back surface of the polygonal body portion of the joint member and one end surface of the cylindrical member are in contact, the rectangular portion of the joint member is inserted into the cut portion of the frame member, and the cut surface of the frame member and the side peripheral surface of the cylindrical member are brought into line contact to join the frame member and the joint member. The method of joining the framework for

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