Nanxiong red layer is located in the red rock Nanxiong Basin, about 80 kilometers wide and 18 km, an area of about 1500 square kilometers.
南雄红层是指位于南雄盆地的红色岩层，长约80公里，宽18公里，面积约1500平方公里。
Square timber joists form the base layer and are laid across the span of the structure.
方木搁栅形成的基础层，是整个结构的跨度奠定。
Double layer flat diagonal square pyramid grids has the advantages of being simple in formation, rational in member stressing and fairly economic of steel cost among square pyramid grids system.
双层平板型斜放四角锥网架节点构造简单，受力合理，用钢量是四角锥体系网架中最小的一种形式，也是国内工程中应用较多的一种。
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