渝昆高铁重难点控制性工程长水机场隧道贯通|成人国内精品久久久久一区
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中新网昆明8月4日电 (李何 胡义 刘超)经过1400天连续奋战，渝昆高铁重难点控制性工程长水机场隧道4日贯通，为全线建成通车按下“加速键”。
长水机场隧道是渝昆高铁建设过程中的“硬骨头”，隧道全长8770米，下穿昆明长水机场运营区、货运通道、机场跑道，以及既有沪昆铁路等多处敏感性构筑物。
隧道沿线地质条件错综复杂，围岩破碎、岩溶发育，特别是机场运营对施工变形控制要求极高，是典型的环境敏感、工期控制、技术创新等多重难题于一身的隧道工程。
“为减小施工对机场运营影响，不能采用传统的爆破法施工，我们采用了先进的悬臂掘进机开挖工法。”中铁十八局渝昆高铁站前2标项目负责人丁少宁说，悬臂掘进机作业时截齿高速旋转，将坚硬的岩石一块块“啃噬”下来，同时通过精密控制，把地表沉降严格控制在安全范围内。
“悬臂掘进机的开挖施工综合考量了安全性、适用性、经济性、环保及工期等多方面因素，这种工法较大节约了建设成本，实现了经济效益与工程质量的双赢。”中铁二院昆明公司负责人罗竹说。
随着长水机场隧道贯通，渝昆高铁云南境内段隧道已贯通43座，隧道贯通已达80%。目前，渝昆高铁云南段全面进入冲刺阶段，路基、桥梁、隧道等站前主体工程已基本成型，站后“四电”及站房工程正在加速推进。
渝昆高铁作为中国“八纵八横”高铁网京昆通道的重要组成部分，全长约700公里，其中云南境内段长388.6公里，是云南省内首条设计时速达350公里的高速铁路。全线建成通车后，重庆到昆明的行车时间将大幅压缩。(完)
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