由中铁十四局负责施工的南京市建宁西路过江隧道首台盾构机“创新号”19日下线，标志着这条距离南京长江大桥最近的过江隧道建设取得重要节点。
建宁西路过江隧道距南京长江大桥2400米，建成后将有效分流大桥交通压力。隧道过江段长2349米，管片外径14.5米，设计为双洞6车道，为城市主干道标准。
隧道建设最大难度是盾构机穿越750米复杂地层，其中310米为断裂破碎带，地层上软下硬，岩石抗压强度达到125兆帕，是目前全国难度最高的隧道工程之一。
为攻克难关，建设者在专家团队指导下，精心打造的这台盾构机配置了可伸缩主驱动和常压换刀刀盘，特别安装了40把双刃滚刀。滚刀装有感应元件，实时传递工作状态信息。这些在我国超大直径隧道行业均为首次。
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