后张法预应力张拉控制难点应对措施

Countermeasures for the Difficulty of Post-Tensioning Prestressed Tension Control

结合某制梁场后张法预应力混凝土简支箱梁工程实践,从材料、工艺装备、设备、施工工艺等详细介绍后张法预应力施工质量控制点,阐述张拉计算方法,如钢绞线的理论伸长值计算、钢绞线实际伸长值计算和钢绞线回缩量计算等,分析张拉控制的难点并给出应对措施。

Combined with the engineering practice of post-tensioning prestressed concrete simply-supported box girder in a beam making plant,the paper introduces the quality control points of post-tensioning prestressed concrete construction in detail from the aspects of materials,process equipment,equipment and construction technology.Paper expounds the calculation methods of tension,such as theoretical elongation value calculation of steel strand,actual elongation value calculation of steel strand and shrinkage calculation of steel strand,analyzes the difficulty of tension control and gives the corresponding measures.