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通过几年的监理工作,总结出了后张法张拉及压浆应注意的事项,希望对日常监理工作有所参考价值。预应力施工具有一定的危险性,尤其是张拉过程中有由于操作不当或者事前未仔细检查发生了许多安全事故,施工操作者必须具有相应的操作技能和实践技能,必须做到考核合格持证上岗,严格按照操作规范施工。张拉必须在梁体强度达到设计强度的80%或者满足设计要求时方可进行,采用两端对称同步张拉工艺,张拉实行应力和钢绞线伸长量双控,一般以预应力为主,不得超张拉。预应力筋张拉完毕后,应及早进行孔道压浆,且应在48 h内完成。
After several years of supervision work, summed up the post-tension method and grouting should pay attention to the matter, hoping to have some reference value for the daily supervision. Prestressed construction has a certain risk, especially in the process of tightening as a result of improper operation or without careful inspection of the occurrence of a number of accidents, construction workers must have the appropriate operating skills and practical skills, must be qualified examination certificate Post, in strict accordance with the norms of construction. Tension must be 80% of the strength of the beam body to meet the design requirements or to meet the design requirements, the use of symmetrical synchronous tensioning at both ends of the process, the implementation of tension and strand elongation double control, generally prestressed to Lord, not super tension. After the prestressing tendons have been stretched, they should be grouted as soon as possible and should be completed within 48 h.