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笔者结合多年学习及施工经验,在综合研究后张法预应力张拉技术的基础上,对后张法预应力技术方面的要求和做法、张拉时的伸长值的计算与实际伸长值的量测方法在桥梁工程上的具体运用一一进行了说明和解释,论述了后张法预应力张拉要在混凝土强度达到设计规定后方可进行,并按一定的顺序对称张拉。通过实践总结出后张法预应力张拉在施工时的一些质量通病,分析其产生的原因,合理进行预防防治。
Based on a comprehensive study of the post-tensioned prestressing tensioning technique, the author combines the years of learning and construction experience with the requirements and practices of post-tensioning prestressing techniques, the calculation of the elongation value during tensioning and the actual elongation value The measurement methods are described and explained concretely in the bridge engineering. The prestressing tension of post-tensioning method is discussed before concrete strength reaches the design requirement, and symmetrical tensioning is carried out in a certain order. Through practice, we conclude some common quality problems of post-tensioned prestressing during construction, analyze the causes of the prestressed tension and reasonable prevention and control.