JPS6252108B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a space truss having a flat or dome shape.

Conventionally, the three-dimensional truss made by pin-joining a single piece of material constituting the Oharima frame has mostly had a flat type or cylinder type configuration, and various configurations have been developed.
However, the structure of the three-dimensional truss that makes up the dome is complicated due to the necessity of forming a spherical surface, and there are few cases in which it has been put to practical use.

This invention has developed a three-dimensional truss whose members are geometrically regularly arranged to form a flat or dome shape. Examples thereof will be described below with reference to the drawings.

The flat type three-dimensional truss shown in FIG. The second equilateral triangle group X formed by connecting the intersections created in every other mesh, that is, the midpoint in this case, and the square formed radially in six directions from each side of the central regular hexagon The lower chord members 2 are arranged along each side of the group Z, and the intersection points O ₁ and O 2 of the upper and lower chord members 1 and ₂ are connected by a belly member 3 (indicated by a dotted line).

When configuring a dome-shaped three-dimensional truss, as shown in FIG. 2, the first triangle group X constituting the mesh of equilateral triangles drawn on the plane shown in FIG.
Project R ₁ onto the spherical surface A, place the upper chord 1 between the projected intersection points, and connect the intersection points created in every other triangle mesh of the first equilateral triangle group X in the same plane. The second triangle group Y consisting of
A rectangular group Z formed radially from the center is defined as a small radius _R2 having the same spherical center O as the spherical surface A with the large radius _R1.
is projected onto the spherical surface B, and the lower chord member 2 is placed between the projected intersections.
The upper and lower chord members 1 and 2 are connected by a belly member 3 between the intersection points O ₁ and O ₂ to form a dome-shaped three-dimensional truss that forms a plane as shown in FIG.

In addition, when constructing a larger dome, a three-layer space truss can be constructed by projecting the triangular mesh of the first equilateral triangle group X onto a spherical surface C having an even smaller radius.

Fig. 4 shows another embodiment, in which the periphery is a flat type space truss with a mesh of scalene triangles, and Fig. 5 shows the mesh of Fig. 4 projected in the same way as in the previous embodiment. It is a dome-shaped three-dimensional truss, and similar members are designated by the same symbols.

FIG. 6 shows an embodiment of a flat type three-dimensional truss in which the center part of the lower chord is a regular pentagon, has square groups Z radially formed in five directions, and the mesh is in the form of a scalene triangle.

The present invention has the above structure, and can be constructed with the geometrical regularity of a triangular mesh, and the stress distribution against vertical loads is also relatively uniform.
Moreover, a flat type or dome type three-dimensional truss can be constructed with substantially the same member arrangement, and is particularly suitable for constructing a large span roof structure.

[Brief explanation of the drawing]

Fig. 1 is a plan view of a flat type, Fig. 2 is a projection explanatory diagram of a triangular mesh, Fig. 3 is a plan view of a dome type, and Figs. 4 and 5 are a plan view of a flat type and a dome type of other embodiments. Plan view, FIG. 6 is a plan view of a flat type of another embodiment. 1...Top chord material, 2...Lower chord material, 3...Body material.

Claims (1)

[Scope of Claims] 1. Upper chord members are arranged along each side of a first group of triangles formed by a triangular mesh drawn on a plane, and
A lower chord member is arranged along each side of a second triangle group formed by connecting the intersections made in every other triangle mesh of the triangle group and a square group formed radially from the central part, A three-dimensional truss characterized by connecting the intersection points of the upper and lower chord members with a belly member. 2 Project the first triangle group consisting of a triangular mesh drawn on a plane onto a spherical surface with a large radius, place a waxing chord between the projected intersection points, and make every other triangular mesh of the first triangle group A second group of triangles formed by connecting the intersection points created in the mesh and a group of squares formed radially from the center are projected onto a spherical surface with a small radius that has the same spherical center as the spherical surface with a large radius, and the projection is performed. A three-dimensional truss characterized in that lower chord members are arranged between the intersection points of the upper and lower chord members, and the intersection points of the upper and lower chord members are connected by a belly member.