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介绍小榄水道特大桥V型斜腿预应力索由斜腿外部的两端张拉优化为在斜腿内部利用张拉锚箱对称、分级单端张拉的技术,对预应力索张拉过程中支架及V型斜腿结构的受力和变形提出了监控要求。采用预应力索来调节V型斜腿施工的应力分布,有效地防止了斜腿根部混凝土的开裂,成功地解决了大角度、大截面V型斜腿施工难题,为同类型桥梁施工积累了经验,有一定的推广价值。
Introduction The viaduct prestressed cable of the Xiaolangtan Waterway Super Bridge is optimized by tensioning both ends of the outside of the slant leg for the symmetrical and graded single-ended tensioning using a tensioned anchor box inside the slanting leg. In the bracket and V-type leg structure of the force and deformation of the monitoring requirements. The use of prestressed cables to adjust the stress distribution in the construction of the V-type oblique leg effectively prevented the cracking of the concrete at the base of the oblique leg and successfully solved the construction problems of the V-type large-angle and large-section V-shaped leg, thus accumulating experience for the same type of bridge construction , There is a certain promotional value.