Abstract:

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.

Key words: Nanjing Weisan Road Rivercrossing Tunnel, doubledeck shield tunnel, internal structure, precast structure