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阐述了箱梁预应力施工过程中张拉伸长值不同步率产生的机理。通过计算,对后张法预应力混凝土箱梁预应力工序施工过程中箱梁两端张拉伸长值不同步率对箱梁预应力损失的影响进行了定量分析,验证了箱梁两端的张拉伸长值不同步率不大于10%的标准能够保证施工质量。指出施工过程中“张拉设备要选用同厂家、同型号,以尽量减少设备因素引起的不同步率”等容易被忽视的几个控制环节;强调了管道摩阻不对称引起的不同步率是导致箱梁预应力应力低于设计值的主要因素,为现场施工质量控制提供参考。
The mechanism of the out-of-sync rate of tensile elongation value during the prestressed construction of box girder is described. Through the calculation, the influence of the unsynchronization rate of the tensile value at both ends of the box girder on the prestress loss of the box girder during the prestressed concrete box girder prestressing process of the post-tensioned method is quantitatively analyzed, Stretching the value of non-synchronous rate of not more than 10% of the standards to ensure the construction quality. Pointed out that in the construction process “tensioning equipment to choose the same manufacturer, the same model, in order to minimize the asynchronous factor caused by equipment factors ” and several other easily overlooked aspects of control; emphasizes the pipe asymmetry caused by friction asymmetry The rate is the main factor that causes the prestressed stress of the box girder to be lower than the design value, which provides a reference for the construction quality control in the field.