The finished space grids structure must be carried out acceptance evaluation, the installation engineering quality acceptance is a fundamental task to ensure the structural quality.
网架结构施工完毕后必须进行验收评定，网架结构安装工程质量的验评是确保结构质量的基础性工作。
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。
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