为解决单管双层特长盾构隧道施工距离长、施工空间有限和工期紧张等问题，结合南京市纬三路过江通道工程，研究双层盾构隧道内部结构构件的预制施工技术，采用结构构件预制与现浇相结合的梁-板-柱结构体系，合理组织施工步序，探索单管双层特长盾构隧道预制内部构件的施工方案。工程实践表明，现浇内部结构立柱及柱基础，预制上层车道板、烟道隔墙板、排烟通道板和逃生通道板，能够满足双层特长盾构隧道施工进度的要求，可大幅提高施工效率，缩短建设工期，节省工程投资。

The construction distance of the singletube doubledeck rivercrossing shield tunnel on Weisan Road in Nanjing is long; the construction space is limited; and the construction schedule is tight. As a result, the precasting technologies for the internal structure of the tunnel are studied; and then the beamdeckcolumn structure system by means of castinsitu and precast and rational construction procedure are adopted. Finally, the rational construction scheme of singletube doubledeck extralong shield tunnel is adopted. The construction practice shows that the technologies used can improve the construction efficiency greatly, shorten the construction schedule and reduce the cost.