It simply is steel (mostly steel) welded into two nets, such as by a number of small squares of flat screen. Then two flat screen with vertical steel welded into a three-dimensional network structure, if the vertical alignment of the two small square grid, then can be welded into a cube, but this discontinuity good. The two grids are usually stacked vertically misaligned, a small mesh node to another small grid center, welded into a three-dimensional rectangular vertebral structure. No pictures, is difficult to explain. Grid used in large span space. Shed a lot of the gas station is a grid structure, and some high-speed toll is, if you look will understand. Add grid node is a ball, like football like that. Re-image point, for example, you can plug a few chopsticks on table tennis.
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