JPH0223661B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the provision of a novel space truss roof structure.

Conventional three-dimensional truss roof structures are generally constructed by assembling roof finishing materials such as folded metal plates or concrete slabs onto the upper or lower chord members of the three-dimensional truss, but the total weight of the roofing materials is extremely large. In order to support this, the truss members have to be huge in size, and the cross section of the truss members, especially those with large spans, has increased and the grid has shrunk, requiring an extremely large amount of steel frames. , which resulted in high costs.

The present invention was made in view of the above-mentioned circumstances, and its gist is to spread ultra-light membrane material on the upper and lower chord members of a three-dimensional truss, and to blow air into the closed space formed to reduce the internal pressure. In addition, it stabilizes the lower membrane and greatly reduces the weight burden on the truss members, thereby reducing the cross section of the truss members and increasing the grid, which in turn reduces the amount of steel. The aim is to achieve an economical three-dimensional truss structure.

This will be explained in detail below based on the drawings.

That is, FIGS. 1a and 1b are partially cutaway overhead views and longitudinal sectional views of the roof structure of the present invention. In the figures, 1 is a three-dimensional truss, and its upper chord members 1a and lower chord members 1b are made of glass fibers and a Teflon coating film. An ultra-light membrane material 2 such as wood is fixedly assembled, and the inner side 3 and outer side 4 of the three-dimensional truss 1 are cut off, and the inner side 3 of the three-dimensional truss 1 becomes a closed space, into which air is blown. , by setting its internal pressure slightly higher than the external pressure,
The membrane material 2 is stabilized in a stretched state. In other words, the membrane material 2 generates tension and is given appropriate rigidity, but this also prevents large deformation and vibration (flapping) from loads such as rain, snow, and wind, which are necessary for roofing materials. ) is created and stabilized.

The membrane material 2 is fixed to the upper and lower chord members 1a and 1b, for example, as shown in FIG. A core material 4 to prevent slipping is inserted into the folded bag part, and a mounting clamp 6 is attached to the thick periphery via neoprene sheets 5, 5' to prevent scratches.
Attach bolt 7 to upper chord 1a or lower chord 1.
It is held down against b.

In the configuration described above, the weight of the roof finishing material assembled on the three-dimensional truss is greatly reduced.

Therefore, in accordance with the present invention, as the weight of the roof finishing material is reduced, the cross section of the three-dimensional truss member can be reduced and the grid can be increased, the number of joints can be reduced, and the amount of steel can be reduced. Therefore, a rational and economical design is possible, and furthermore, due to the translucency of the membrane material 2, there is no need for lighting during the day, which is particularly advantageous for large spans. As mentioned above, by blowing air into the closed space, a predetermined rigidity is imparted to the membrane material 2, which cannot be used as a roofing material by mere attachment, and it is rational to use it as a structural material.

[Brief explanation of drawings]

The figures show embodiments of the present invention, and Figures 1a and 1b are partially cutaway overhead views and vertical sectional views of the roof structure of the present invention, and Figure 2 is an enlarged detailed view of the encircled line A section in Figure 1b. It is a diagram. 1... Three-dimensional truss, 1a... Upper chord material, 1b... Lower chord material, 2... Membrane material.

Claims (1)

[Claims] 1. In a three-dimensional truss characterized in that an ultra-light membrane material is stretched over the upper and lower chord members of the three-dimensional truss, air is blown into the formed closed space, and the upper and lower membranes are stabilized by internal pressure. roof structure.