JPS6139459B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a steel frame constituting a three-dimensional truss of a structure having a large frame.

The framework of a conventional space truss generally forms a grid of triangles, quadrangles, rhombuses, etc. By the way, a continuous hexagonal shape as seen in a honeycomb structure has good stability and is advantageous because it has a small number of members. In addition, in a three-dimensional truss, compressive force acts on the top chord, whereas tensile force acts on the bottom chord, so the length of the bottom chord can be made longer than the top chord if the cross section is the same.

From the above point of view, the top chord forms a hexagonal and triangular lattice, the bottom chord forms a hexagonal lattice larger than the hexagon of the upper chord, and the lattice pieces are stacked up and down to form an inverted triangular pyramid. A three-dimensional truss placed between chord members has been proposed. By the way, in this three-dimensional truss, a large hexagonal cavity is formed when viewed from above.

This invention aims to obtain a rational and well-balanced three-dimensional truss by increasing the number of lattice materials by making the lattice patterns of the upper and lower chord members the same, but by making the positional relationship of the lattice patterns of the upper and lower chord members different.

The details will be explained below with reference to illustrated embodiments. The frame of this invention consists of an upper chord member 1, a lower chord member 2, and a lattice member 3.

The upper chord member 1 has members in three directions that intersect with each other at equal angles of 60 degrees to form a regular hexagon A and a lattice with equilateral triangles B arranged on the outside of each side, and the lower chord member has the regular hexagon A. A and a continuous lattice of a regular hexagon C whose vertices are at the lower center position of every other regular triangle B on the outside of the regular hexagon, that is, a hexagon forming a honeycomb structure with sides larger than the sides of the regular hexagon A. It forms a grid. The vertices of the regular hexagon A formed by the upper chord member 1 and every other apex of the regular hexagon C formed by the lower chord member 2 are connected by a lattice member 3.
A hollow unit hexagonal pyramid is constituted by the sides of the regular hexagon A and the lattice material 3 connected to the vertices thereof.

Figures 3 and 4 show the node of the X part, where the upper chord member 1 is connected to the horizontal gusset plate 4, and the lattice member is connected to the central pipe 5 and the gusset plate 6 which is orthogonal to the gusset plate 4. 3 are connected.

Figures 5 and 6 show the node portions of the Y section, in this case a gusset plate 4 that connects the lower chord member 1, a gusset plate 6 that connects the lattice member 3, and a plate that attaches the center pipe 5. 7 is of split type, which are overlapped and bolted together. Similarly to this case, the node portion of the X section can also be divided.

In the above embodiments, regular hexagonal and regular triangular lattices are formed, but they do not necessarily have to be regular squares and may be modified. Moreover, instead of a planar structure, it can also be a chevron-shaped or curved structure.

The structure of this invention consists of the above-mentioned structure, in which the intersection of the hexagonal lattice of the lower chord is located below the center of the hexagonal lattice of the upper chord, and the inverted hexagonal pyramids formed by the lattice are regularly arranged, The members are arranged in a well-balanced manner in both the in-plane direction and the out-of-plane direction of the space truss, and some members are not enlarged, and the member sizes are well balanced.

[Brief explanation of the drawing]

1 and 2 are a plan view and a perspective view showing an outline of the invention, and FIGS. 3, 4, 5, and 6 are detailed views of the nodal portion. 1... Upper chord material, 2... Lower chord material, 3... Lattice material, 4, 6... Gusset plate, 5... Pipe, 7... Plate.

Claims (1)

[Claims] 1. The upper chord consists of members in three directions that intersect with each other to form a hexagon with triangular grids arranged on the outside of each side, and the lower chord consists of the hexagon and one of the outer sides of the hexagon. A continuous lattice of hexagons is formed with the vertices at the lower center of the triangle, and the vertices of the hexagon of the top chord and every other hexagon of the bottom chord are connected by lattice material. The framework of a structure characterized by: