广州猎德大桥体系转换施工方法的确定及实施

Determination and Implementation of Construction Method for System Transformation of Liede Bridge in Guangzhou

广州猎德大桥是一座边跨散索套底部无支承的空间主缆自锚式悬索桥,若按由主塔向锚跨的常规顺序张拉边跨吊索,则边跨散索套将产生较大的竖向位移,引起主缆索股在锚管口的弯折。针对此问题,根据该桥体系转换应遵循的原则,给出体系转换的方案,即主跨吊索按常规顺序张拉的同时,交替张拉边跨吊索。边跨吊索张拉顺序为:先张拉散索套附近第1根满足构造条件的吊索,然后由该吊索向散索套逐步张拉,再由该吊索向主塔逐步张拉。最后给出该类桥体系转换的实施要点。猎德大桥体系转换实施效果良好,高效高精度地达到了预期目标。

The Liede Bridge in Guangzhou is a spatial main cable self-anchored suspension bridge having a splay casting without bottom support arranged at the side span.If the side span suspenders of the bridge are tensioned according to the normal procedure from the tower to the anchor spans,the considerable vertical displacement will occur at the splay casting and will cause the main cable strands to bend at the anchor tubes.In view of the problem and in accordance with the principle that should be followed in the s...