JPH0765338B2 - Space truss - Google Patents

Description

The present invention relates to a space truss constructed by connecting truss units assembled in a quadrangular pyramid shape continuously in two directions.

(Problems to be Solved by the Invention) As in Patent Nos. 410,917 and 443,434, a truss unit assembled in a quadrangular pyramid shape from four upper chord members and four diagonal members is continuously formed in two directions. The three-dimensional truss, which is arranged by connecting the adjacent upper chords to each other and passing through the vertices of the quadrangular pyramid and laying the lower chords parallel to the upper chords, the upper and lower chords forming a grid-like mesh, respectively. As a general frame structure of truss structure, it has been widely used for roof frames of large span structures.

By the way, in the space truss of this form, the restraint between the nodes in the diagonal direction of the lattice composed of the upper chord member and the lower chord member is weak, and the torsional rigidity around the diagonal line is insufficient. However, if a large load is expected due to factors such as the size of the structure, the shape of the roof, the weight, etc., the adoption of this truss structure may be abandoned, and the limit of application may be encountered. .

The present invention has been made by paying attention to the structural limitation of the above-mentioned space truss, and intends to newly propose a space truss having a high load bearing capability.

(Means for Solving the Problem) In the present invention, a connecting member is installed between the nodes of the upper chord member and the lower chord member in a diagonal direction of each lattice to restrain the unit lattice, thereby increasing the rigidity as a lithographic plate. By crossing the direction of the connecting material of the upper and lower chords, the directionality of the rigidity is eliminated, and at the same time, the force is dispersed and flowed to reduce the stress load on the truss members, and the application range of this truss structure is improved. Expand.

In a three-dimensional truss, truss units assembled in the shape of a quadrangular pyramid from upper chord members and diagonal members are continuously arranged in two directions, and upper chord members that are adjacent in the axial direction are connected to make them continuous. A lower chord member is connected in parallel to the upper chord member between the nodes where the diagonal members are connected, and the upper chord member and the lower chord member are each formed into a grid-like mesh, which is formed by the upper chord member and the lower chord member. The upper and lower connecting materials are installed in the diagonal direction of the lattice.

The upper tie material and the lower tie material are installed in a direction intersecting with each other in a plane.

(Example) The present invention will be described below with reference to the drawings illustrating an example.

As shown in FIG. 1, the space truss T of the present invention is constructed by connecting truss units t assembled in advance in the shape of a quadrangular pyramid continuously in two directions in a planar lattice pattern. The upper tie member 4 and the lower tie member 5, which are horizontal braces of the unit lattice, are installed between the nodes of the above and between the nodes of the lower chord member 2 to enhance the shape maintaining ability of the lattice.

The truss unit t is a basic unit of the space truss T, and as shown in FIG. 3, four upper chord members 1 and four diagonal members 3 are provided.
Consisting of, and each member is a ball joint 6 that serves as a node of the space truss T
It can be assembled by connecting to. The ball joint 6 is connected to a position where the upper chord member 1 and the diagonal member 3 gather and a position where the diagonal members 3 gather.

For example, as shown in FIG. 1, the truss units t are arranged continuously in a plan every other square with the apex facing downward.

And the truss units t, t adjacent to the upper chord member 1 in the axial direction
By connecting the upper chord members 1 and 1 to each other and making them continuous, the upper chord member 1 forms a mesh of continuous unit lattices as shown in FIG.

In the portion surrounded by the truss unit t, which is placed in one square, the upper chord member 1 of the truss unit t around it also serves as the upper chord member 1 of the adjacent grid, so that the connection to the upper chord member 1 of the diagonal member 3 is made on site. The diagonal members 3, 3 are connected to each other.

In addition, a lower chord member 2 is installed in parallel with the upper chord member 1 between the nodes at which the diagonal members 3 of the truss unit t are connected at the apex of the quadrangular pyramid, and the lower chord member 2 is also shown in FIGS. Thus, a grid-like mesh is formed. The broken line in I and the solid line in II indicate the lower chord member 2.

At this time, since the truss unit t in which the apex faces upward is formed by the diagonal members 3 and the lower chord members 2 of the four adjacent truss units t, the three-dimensional truss T first has the apex of the truss unit t. It is also possible to perform the assembly after arranging the so as to face upward.

Between the nodes of the unit mesh of the upper chord member 1 and the lower chord member 2 above, as shown in Figs. 1 and 2, respectively, the upper connecting member 4,
The lower connecting material 5 is installed.

As shown in the figure, the upper tie member 4 is laid in a diagonal direction of the unit lattice of the upper chord member 1, while the lower tie member 5 is the lower chord member 2
Are erected in the unit lattice of the above in a direction orthogonal to or diagonal to the upper connecting member 4.

The thick line in FIG. 2I shows the erected state of the upper connecting member 4, and the thick line in II shows the erected state of the lower connecting member 5.

The upper tie member 4 and the lower tie member 5 strengthen the restrained state of the lattice formed by the upper chord member 1 and the lattice formed by the lower chord member, and when both tie members 4 and 5 cross in a plane, an external force is exerted. Flows in these two directions in a distributed manner, and the member stress is equalized over the entire surface.

The upper tie member 4 and the lower tie member 5 are put in the whole or part of the mesh, and how to put them is determined by the stress of the members.

(Effects of the Invention) The present invention is as described above, and the upper connecting material and the lower connecting material are installed in a state of intersecting each other in the diagonal direction of the lattice formed by the upper chord member and the lower chord member. The restraint effect of the unit lattice is enhanced, the rigidity of the planographic printing plate is enhanced, and at the same time, the forces are dispersed and flow, and the stress on the truss member is reduced.

As a result, the load bearing capacity of the space truss is increased, the applicable range of the space truss can be expanded, and conversely, the cross-sectional size of the truss member can be reduced for the same load.

[Brief description of drawings]

FIG. 1 is a perspective view showing an assembly example of the present invention, and FIG.
I and 11 are plan views of the upper chord member surface and the lower chord member surface, and FIG. 3 is a perspective view showing the truss unit. T ... three-dimensional truss, t ... truss unit, 1 ... upper chord member, 2 ... lower chord member, 3 ... diagonal member, 4 ... upper connecting member, 5
...... Lower tie material, 6 …… Ball joint.

Claims (1)

[Claims] 1. A truss unit assembled in a quadrangular pyramid shape from an upper chord member and a diagonal member is continuously arranged in two directions, and adjacent upper chord members in the axial direction are connected to each other to make the truss unit continuous. In the three-dimensional truss constructed by connecting the lower chord members in parallel to the upper chord members between the nodes where the diagonal members are connected, and forming the lattice mesh in the upper chord members and the lower chord members respectively, between the nodes of the upper chord members A three-dimensional truss characterized in that the upper connecting material is installed in the diagonal direction of the unit lattice, and the lower connecting material is installed between the nodes of the lower chord material in a direction intersecting the upper connecting material in a plane.