以襄樊市汉江三桥南岸引桥为例,对超长预应力束的初应力、锚圈口摩阻损失、锚固回缩损失、有效预应力、持荷时间及超张拉荷载进行了测试,并通过相关的理论计算、对比分析,得到了准确的有效预应力以指导施工。 Taking the approach of approach bridge of South bank of Hanjiang River Bridge in Xiangfan City as an example, the initial stress of ultra-long prestressed beam, the frictional loss of anchor ring, the loss of anchorage and retraction, the effective prestress, the holding time and the super tensile load were tested. Through the related theoretical calculation and comparative analysis, accurate and effective prestressing has been obtained to guide the construction.