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地铁8号线过江隧道昨贯通 为武汉第三条越江地铁

2017-08-10 09:00:03   

图为轨道交通8号线一期越江盾构机成功破土而出

图为轨道交通8号线一期(站点名称以实际开通为准)制图:倪文谈

楚天金报讯 记者张吉晴 通讯员常敏 刘丹丹 袁永华 于景信 图/记者曹大鹏

历经14个月的掘进,直径为12.5米的盾构机从徐家棚来到了黄浦路,昨日,随着盾构机的正式出洞,至此,作为武汉第三条穿越长江的轨道交通线路,轨道交通8号线一期越江隧道正式贯通,这也同时意味着该线路隧道全线贯通。

从最初的国内首条越江地铁隧道——武汉轨道交通2号线越江隧道开始,武汉的轨道交通建设一次次在刷新标杆,为市民带来一次次的惊喜。作为国内最大的单管双隧隧道,轨道交通8号线一期开创了武汉地铁越江新模式,一个隧道内两条轨道并行跑,有效节省了过江通道资源。今年年底,这条轨道交通线路将开门迎客,预计开通初期,将分担过江客流的8%。

【难点】

5层楼高的盾构机穿江来

途中磨坏1300多把刀具

轨道交通8号线一期工程长江段,采用的是单洞双隧的模式。这台名为“楚天号”的盾构机其直径达到12.5米,近5层楼高,总重量达3300多吨,“盾构的洞内直径有10米左右,是国内最大的单管双隧地铁越江隧道,开通后两条轨道可以供列车来回平行跑。”武汉地铁集团轨道交通8号线一期越江段项目经理李江龙介绍。

这条全长3186米的隧道,两端连接武昌徐家棚车站与汉口黄浦路站,隧道盾构外径12.1米,是目前国内最大直径地铁专用盾构隧道,隧道有1365米长距离需穿越强透水、上软下岩复合地层,其中镶嵌硬度高达135兆帕的大块石英砂岩,这些石英砂岩的硬度相当于金刚石。这个巨无霸盾构机遇到了这块“硬骨头”,今年2月至5月份时,平均每天掘进2米就得更换一把刀具,最慢时,24小时只能前进4米,且经常遇到黏土夹层。

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