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阳逻线6座车站 位于长江新城起步区
2017-08-22 05:21:35 中国青年网
中建三局阳逻线幸朱区间盾构经理徐程说,幸朱区间是全线最长的盾构区间,盾构机要在地下穿越大量建筑物及朱家河等,施工挑战性很大。
“线路横跨了沪汉蓉高铁和京广铁路,这是全国两条异常繁忙的铁路干线,盾构机下穿铁路期间轨道沉降要求不超过3毫米。”徐程说,“为实现这一目的,武汉地铁集团和中建三局邀请全国业界知名专家召开方案论证会达20余次,制定出指导性极强的方案。”
据悉,整个下穿铁路期间,列车经过施工路段速度均控制在45公里以内/小时,并有专门人员24小时值守,确保了盾构机以日均8环的进度顺利下穿两条铁路线。
穿越“特殊地质博物馆”
“地老虎”换“牙”15遍
幸朱区间穿越地层中有溶洞群、上软下硬地层、全断面硬岩地层及淤泥质土层,堪称“特殊地质博物馆”。其中溶洞有120余个,上软下硬地层长度达到500米。
徐程介绍,上软下硬地层的岩石强度堪比花岗岩,盾构机的刀具在通过这段地层时频繁换刀。幸朱区间双线共换刀400余把,相当于将盾构机的刀具整体更换了15遍。
此外,幸朱区间盾构机在汛期下穿朱家河段达600多米,隧道顶部覆土埋深仅10米左右。进入汛期后,朱家河水位最高达27米,超出往年同期水位近10米。河底地层主要为淤泥质土层,地下水极其丰富,地质起伏多变,部分区段与含黏土卵砾石地层相交,透水性强。为此,项目部多次组织专家论证会,总结同类地层掘进经验,指导河床段施工,并将施工地层条件细致到每一环的掘进中。同时,建设和施工单位加强了对河床水位的监测,确保了盾构机连续、快速、安全、高质地穿越朱家河。
百步亭
花园路站
新荣客运站
朱家河站
谌家矶站
换乘线路
一般车站
3号线
14号线
幸福湾站
青龙站
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