后张法预制箱梁预应力施工技术要点分析

Analysis on Key Points of Prestressed Construction Technology of Post Tensioned Precast Box Girder

在后张法预制箱梁施工中,在预应力张拉及压浆节段经常存在压浆不饱满、张拉断丝滑丝、张拉力不足以及伸长值超过规范要求等质量问题,往往是由于作业人员未按方案和规范要求执行、未严格落实设置的质量控制关键点落实等。为有效避免这类问题,有必要对施工技术要点进行探讨。

In the construction of post-tensioned precast box girder, there are often many quality problems in the prestressed tensioning and grouting sections, such as insufficient grouting, broken silky wires, insufficient tension, and elongation values exceeding specifications Request etc. The reason is often that the operators did not implement the plan and specifications, and did not strictly implement the key points of the quality control set. In order to effectively avoid such problems, it is necessary to discuss the key points of construction technology.