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由于先张法预应力可以长线施工,生产效率较高,又能节省大量的锚具材料,在不少的建筑结构厂和现场予以采用。在公路桥梁中,多采用Ⅳ级粗钢筋作先张预应力施工。由于钢厂生产出来的钢筋,比构件配筋的长度小,因此,在大多数情况下,用粗钢筋作先张法预应力施工的程序,是按构件尺寸和钢筋的试验资料进行配筋下料;用闪光
As the pre-tensioning method can be used for long-term construction of prestressed, high production efficiency, but also save a lot of anchorage materials, in many building structures and sites to be adopted. In highway bridges, the use of grade â ... ¢ crude steel tend to pre-stress construction. Due to the steel produced by steel mills, the length of reinforcement is smaller than that of structural members. Therefore, in most cases, the procedure of prestressing with pre-tensioned steel bars is based on the experimental data of structural dimensions and steel bars Material; with flash