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预应力钢筋在张拉过程中会因受拉而伸长,操作之前需将伸长值预先算出,以作为确定预拉应力值的对照依据,或供与液压系统压力表读数值校核用;此外,复核测定因预应力钢筋与孔道壁之间摩擦引起的预应力损失值、锚具八寸的选择(如确定垫块厚度、螺丝杆的螺纹长度)等各项工作,也都需进行张拉伸长值计算。为此,在预应力混
During the tensioning process, the prestressed steel bars will stretch due to tension. Before the operation, the elongation value must be calculated in advance to serve as a reference for determining the pretension stress value, or for checking the pressure readings of the hydraulic system; , review and determination of the loss of prestress caused by the friction between the prestressed steel and the wall of the hole, the selection of the anchorage eight inches (such as the thickness of the pad, the thread length of the screw rod) and other work, also need to be stretched Elongation value calculation. For this purpose, prestressing