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武汉天河机场探秘:9条交通隧道下穿机场 飞机如何平稳起降?

2017-08-30 12:31:25   中国青年网

新华社武汉8月30日电(记者徐海波)将于31日正式启用的武汉天河机场T3航站楼是全国交通换乘一体化程度最高的枢纽之一,共有9条各类交通隧道下穿航站楼,实现了航空、城铁、地铁、公路长途、公交、出租车、社会车辆等7种交通方式无缝对接。在地下交通飞驰而过的同时,地面上的飞机如何平稳起降?

T3航站楼总设计单位中南建筑设计院总建筑师桂学文介绍,穿越航站楼下方的这9条交通隧道分别是两条陆侧公路、两条空侧服务车道、一条综合管廊、两条地铁隧道、一条城际铁路隧道、一条捷运预留隧道。下穿隧道数量和规模全国第一,其中城际铁路以时速200km/h通过,国内鲜有先例。这不仅带来复杂的车流和人流,更给地面物体带来了巨大的振动,直接影响航站楼和旅客安全。

为攻克这一技术难题,中南建筑设计院通过系统的振动专项研究和反复模拟试验分析,最终采用分离式结构,城铁隧道紧贴航站楼桩基,最近距离仅1米,最大限度地避免了旅客在安静的环境下感受到地铁的振动。同时,中南建筑设计院运用BIM施工模拟技术选择最合理的施工方案,保证了结构安全,有效避免了各种交通方式对航站楼的振动传递,最大限度地保障了航站楼安全和旅客候机舒适性。

同时,9条不同类型的隧道纵横交错,也给施工带来了巨大的难题。航站楼总建设方中建三局基础设施公司项目部党支部副书记张庆锋介绍,经多方案讨论比选,施工方创新提出采取少支点贝雷梁、柱式支架体系方案,即建大楼时,做一些高架桥支点,支点上方是停车楼顶板,下方是停车楼承台,这样可将支点的荷载转移到停车楼承台及桩基上,避免将荷载落到回填土上。此方案经过武汉市城建科技委专家咨询论证,成功化解了楼前高架桥、停车楼及城地铁隧道共建带来的施工难题。

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