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通过南水北调中线一期工程高邑赞皇段大型渡槽预应力施工实践,探讨了后张法三向预应力施工相关技术及质量控制。提出在后张法三向预应力施工中,张拉顺序是施工关键,在预应力钢绞线或钢筋张拉时采用张拉应力和伸长量2个指标双控能有效控制张拉质量。
Through the practice of prestressed construction of the large aqueduct of Zha Huang Section of the Middle Route of South - to - North Water Diversion Project, the related technology and quality control of three - way prestressed construction of post - tensioning method are discussed. It is proposed that in the post-tensioning three-way prestressed construction, the sequence of tensioning is the key to construction. When the prestressing strand or the tensioning of steel bar is used, the dual control of two indexes of tensile stress and elongation can effectively control the tensioning quality.