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世界第一跨径钢箱梁悬索桥主缆索股跨越珠江

2017-09-26 19:57:52   

央广网广州9月26日消息(记者郭翔宇)今天上午,世界第一跨径钢箱梁悬索桥——虎门二桥坭洲水道桥主缆索股成功跨越珠江,同时这也是中国制造的1960兆帕钢丝首次大规模应用于桥梁建设。

3小时跨越珠江

上午9时许,坭洲水道桥主缆基准索股从东莞市沙田岸放索架出发,通过“针头”拽拉器,在卷扬机的牵引下,先后跨越47.8米高东锚碇、260米高东主塔、1688米中跨、260米高西主塔,历时3小时后成功跨越珠江,与广州市番禺海鸥岛岸西锚碇顺利对接。

这标志着悬索桥最重要的“生命线”——主缆索股架设工程正式开始,也标志着虎门二桥坭洲水道桥上部结构施工进入又一新的建设高峰。

虎门二桥建成后全长近13公里,有两座超千米的世界级跨江特大桥,其中坭洲水道桥以1688米跨径位列钢箱梁悬索桥世界第一;主塔高260米,相当于90层楼的高度,高度国内悬索桥第一;锚碇地连墙外径达90米,壁厚1.5米,面积相当于15个篮球场,规模国内第一;1688米跨径的坭洲水道桥为钢箱梁悬索桥,跨径世界第一;八车道钢箱梁全宽49.7米,宽度世界整体式钢箱梁第一。

克服技术难题,大桥主缆用上“中国芯”

主缆架设是悬索桥最有技术挑战的工作,虎门二桥坭洲水道桥采用预制平行钢丝索股(P.P.W.S)主缆,共设两根。要把3万多根5毫米的钢丝组合成整齐排列的1米直径的正圆形主缆,难度可想而知。

尤其是主缆钢丝的选择,坭洲水道桥主缆由32004根直径只有5毫米的钢丝组成,100年内不可更换的特性,让这一根根“细小”的钢丝肩负着桥梁百年的重托。正是因为如此,虎门二桥建设者将眼光瞄准抗扭转能力和抗拉强度比1770兆帕钢丝更好的1960兆帕钢丝的制造和运用上。

经过多方的调研与研究、多种尝试与实验,国产1960兆帕钢丝成功研制并大规模应用于虎门二桥。这是在国内的首次应用。

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