新建西宁至成都铁路红原跨G213特大桥连续梁合龙|性欧美老妇另类XXXX
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中新网成都7月24日电 (记者 刘忠俊)7月24日,新建西宁至成都铁路(以下简称“西成铁路”)红原跨G213特大桥连续梁完成最后一方混凝土浇筑,顺利合龙,为全线通车奠定基础。

作为我国“八纵八横”高铁网兰(西)广通道的重要组成部分,西成铁路起于青海西宁,经青海省海东市、黄南藏族自治州,甘肃省甘南藏族自治州,四川省阿坝藏族羌族自治州,接入四川省成都市成都东站。其中,西宁至成都铁路四川段由川青铁路黄胜关站引出,途经红原、班佑、若尔盖、阿西、花湖和郎木寺等站进入甘肃省境内,共约170公里,绝大多数路段在海拔3500米左右。
此次合龙的红原跨G213特大桥全长6035.43米,海拔3623米,地处若尔盖县湿地沼泽区,跨越黄河支流热曲河,是全线控制性工程。“施工中面临含氧量不足平原60%、昼夜温差超20℃、全年有效施工期仅5个月的难题。”中铁十九局西成指挥长袁德明称,建设者需背负氧气瓶轮班攻坚,相当于在生命禁区施工。热曲河作为黄河上游支流,环保要求严苛,施工需实现“零污染排放”,对混凝土养护、机械防渗提出极致要求,属于生态敏感禁区。
成兰铁路有限责任公司西成铁路指挥部指挥长印建文表示,面对冻土与沼泽的双重困境,项目团队以钢绞线反拉预压技术实现沼泽支架“零沉降”,承载力达极限荷载120%;定制高原抗风挂篮系统配合智能监控,实现梁体毫米级线形控制;创新三级沉淀与低温混凝土技术,施工废水净化后达饮用标准,湿地植被恢复率100%。
据悉,西成铁路全线建成后,将极大便利沿线群众出行,加速兰(州)西(宁)城市群与成渝城市群联动,促进沿线经济社会发展。(完)
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