摘要
介绍了在开凿无粘结预应力砼楼板大面积梯间洞口的过程中 ,解除原有预应力的处理工艺和重新建立预应力的方法 ,通过总结设计与施工经验 ,对无粘结预应力技术的应用 ,建议根据改造工程的实际情况和预应力钢筋的种类、长度 ,选择适当的张拉程序和锚固方法 ,以达到重建预应力的要求 .
The methods and techniques to relieve and reform the prestressed concrete in the project of digging large area staircase hole on the unsticky prestressed concretive floor were introduced.And meanwhile,some advice on applying the unsticky prestressed techniques based on the experience of the design and construction,was put forward according to the fact of the project to reconstruct and the king of prestressed skeleton and length,the well tension procedure and fix way was chosen to accomplish to expect purpose.
