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材料强度的提高能增强主缆的跨越能力,在跨越距离一定时则能大大减小缆索体系的材料用量。“虎门大桥建设时我们不得不采用进口钢丝绳做主缆,造价贵、钢丝绳偏重偏硬,穿索过程很辛苦”。据虎门二桥副总工程师鲜荣介绍,虎门二桥主缆采用国产1960兆帕钢丝绳,材料自重轻,体量细软,已按施工尺寸剪裁出具体长度。据介绍,坭洲水道桥采用1960兆帕镀锌钢丝主缆索股后,主缆总重约30120吨,相比1770兆帕镀锌钢丝主缆,降低近3800吨,极大的减小了材料用量。
“中国的桥梁安上国产的‘中国芯’,虎门二桥在钢丝绳研发工作上取得了突破性进展,让中国桥梁进一步从 ‘建造”走向“智造’”。有业内人士对虎门二桥项目1960兆帕钢丝绳的研发与应用给出了这样的评价。
预计2019年通车将为珠江两岸提速
自2014年6月完成第一根试验桩以来,虎门二桥参建各方团结一致,攻坚克难,历磨刀石上立桩基、创超大锚碇一次性1.8万方混凝土浇筑记录、建260米超高门式索塔、连国内最长跨江先导索。历时三年,在珠江口水域用水泥做颜料、以钢筋为画笔,在珠江口水域画出光耀南粤的千米跨江空中彩虹。
“虎门二桥主桥已完成下部构造‘四塔四锚’施工,2017年6月在先导索跨越珠江施工后,工程建设全面转入上部构造施工工序。”虎门二桥相关负责人称,首根主缆索股的架设,标志着坭洲水道桥上部构造主体工程施工正式启动,主缆索股架设预计18年1月完工,随后进入钢箱梁吊装施工,预计2018年7月初钢箱梁吊装合龙。
虎门二桥项目是落实《珠三角地区改革发展规划纲要(2008—2020年)》重要基础设施和“粤港澳大湾区”国家战略重要组成部分,预计2019年上半年建成通车。
建成后,不但可以缓解虎门大桥交通流量,实现珠江两岸交通提速,更将进一步加强珠江三角洲核心区域经济往来,强化南沙新区联接珠江东西两岸城市群的枢纽地位,促进沿线地区经济发展。
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