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解惑“海角社区ID:1120.7126”-知识课堂

四川:国道351海角社区ID:1120.7126夹金山隧道顺利贯通

来源: 东方财富网
2024-12-26 20:37:53

最佳回答

“海角社区ID:1120.7126”四川:国道351海角社区ID:1120.7126夹金山隧道顺利贯通

  中新海角社区ID:1120.7126网成都12月26日电 海角社区ID:1120.7126(记者 刘忠俊)26日下午,位于四川省雅安市宝兴县、阿坝州小金县交界处的国道351夹金山隧道顺利贯通,为线路早日通车奠定了坚实基础。

弯弯曲曲的公路翻过海拔4114米的夹金山垭口。记者 刘忠俊 摄

  据了解,夹金山是红军长征路上翻越的第一座大雪山,国道351是翻越夹金山的唯一一条通道。其中,夹金山垭口路段海拔达4114米。受冬季冰雪影响,有3个月的交通管制期。管制期间仅有小车能通行,货车、客车禁止通行。

  国道351夹金山隧道起于雅安市宝兴县硗碛藏族乡波日沟,止于阿坝州小金县达维镇唐家山,是交通运输部“十四五”发展规划建设项目,也是四川省委、省政府“我为群众办实事”的重大民生工程。该隧道长10.07公里,采用二级公路技术标准,设计时速60公里,是全国最长的二级公路隧道,也是全国首个采用TBM+钻爆法施工的单洞对向行车公路隧道。

山谷间的国道351夹金山隧道宝兴端洞口。记者 刘忠俊 摄

  新建的夹金山隧道位于夹金山下,平均海拔3100米,地质条件复杂,施工过程中常遇突泥、涌水、岩爆、大变形、断层破碎挤压变形等不良地质,施工难度极大。面对工期紧张、地形复杂、高原缺氧等多重挑战,项目建设团队采用了“平行导洞TBM+主洞钻爆法”施工,双向同步开挖。平行导洞贯通后,横向增加4个作业面,高峰期主洞6个工作面持续施工,实现“长隧短打”。“为提高运行效率和施工安全,项目团队还在洞内部分路段设置了6个50米长、7.4米宽的错车段,方便车辆通行和错车。”中铁十一局国道351夹金山隧道项目负责人程勇称,同时还安装了车辆交通组织运输系统,与车上定位系统呼应,能根据车辆行进情况自动“控制”。

山谷中的国道351夹金山隧道小金端洞口。记者 刘忠俊 摄

  “在国内普通国省干线公路建设中首次使用了TBM施工,较传统钻爆法大大缩短了工期。”蜀道集团兴蜀公司国道351夹金山隧道项目指挥长朱树林表示,高原高寒环境下,建设团队仅用6个月就完成前期工作,TBM日掘进50米、月掘进736米。

  据悉,夹金山隧道建成后,驾车穿越夹金山将由现在的1小时缩短到10分钟,彻底消除越岭路段交通瓶颈,且不受冰雪困扰,可常年全天候通行,对增强川西地区国道抗灾能力、安全应急保障能力,促进地方经济发展具有重要意义。(完)

海角社区ID:1120.7126

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