后张法预应力混凝土施工,是先浇筑混凝土,并在预应力筋的位置预留出相应的孔道,待混凝土达到设计要求强度后再张拉预应力钢材以形成预应力混凝土构件的施工方法。本文结合南水北调南阳试验段丁洼东南跨渠公路桥施工过程,对后张法箱梁施工过程中操作控制要点进行研究和探讨。 Post-tensioned prestressed concrete construction, is the first pouring of concrete, and prestressing tendons in place to set aside the corresponding hole until the required strength of concrete design requirements and then prestressed steel prestressed concrete components to form the construction method. Based on the construction process of Dingwa southeastern span highway bridge in Nanyang test section of South-to-North Water Diversion Project, the key points of operation control in the process of post-tensioned box girder construction are studied and discussed.