The presentation and application of prestressed steel structure has come through about half a century, but the application of prestressed double layer space grids is merely twenty years.
预应力钢结构的提出和应用已经历了将近半个世纪，而预应力钢网架的应用，还只是近二十年的事。
The new-type double layers wheel shape beam strings prestressed steel roof truss was used in Guangzhou Nansha Gymnasium.
广州南沙体育馆屋盖采用了新型的双层轮辐式空间张弦预应力钢屋架。
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