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 project was first one using prestressed anchors with double layer protect for construction in domestic hydraulic engineering.
施工中大量采用双层保护预应力锚索，在国内水利工程尚属首次。
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