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后张法预应力混凝土屋架等构件,一般在施工现场平卧重叠制作,重叠层数为3~4层,个别为5层。关于各层预应力筋的张拉问题,《钢筋混凝土工程施工及验收规范》GBJ10—65(修订本)第211条规定:“平卧重叠浇筑构件的预应力筋自上层开始张拉,全部张拉完毕后应自上而下地逐根校验补足预应力值”。不少单位反映平卧构件在重叠情况下的摩阻影响始终存在。预应力筋张拉完毕后,
Post-tensioned prestressed concrete truss and other components are generally laid horizontally and overlapped on the construction site. The number of overlapping layers is 3 to 4 layers, and individual layers are 5 layers. With regard to the problem of tensioning of prestressed tendons in each layer, Article 211 of the “Code for the Construction and Acceptance of Reinforced Concrete Engineering” (GBJ10-65(Revised)) stipulates: “The prestressed tendons of horizontally overlapping and poured components shall be stretched from the upper layer and all After pull-up, it should be checked from top to bottom to make up for the pre-stress value." Many units reflect the frictional effect of lying components in the overlapping situation. After the tensioning of prestressed tendons is completed,