In order to cope with the increasing aviation demand in Japan, Re-Expansion Project of Tokyo International Airport is taking place. Main construction work of the Re-Expansion Project is to construct the new off-shore runway and a connection taxiway. The image picture of the new runway upon completion is as attached.
Newly produced airport area is 3,120m long and 424m wide for 2,500m new runway. Conventional reclamation method is adopted for 65% of runway construction (2,020m). Since new runway is almost perpendicular to Tama-River flow, the pier structure is adopted for affected runway (1,100m) and connection taxiway.
For the connection taxiway foundation, 65m long steel pipe piles were driven, and steel jackets were installed on the driven piles and rigidly connected by in-situ grouting. Pre-cast concrete slabs were placed on top of the steel jackets and covered by pavement. The construction work had to be implemented just beside the existing runway under operation. The details of connection taxiway construction are reported in this paper.
New runway structure is composed of pier structure and reclamation land. In order to mitigate the differential settlement of the new runway and the end-seawall displacement due to the lateral pressure from reclaimed ground, Super Geo Material method was adopted. This material is light weight and has high strength against segregation for long distance transportation through pipes. Also this material is environmental friendly because it is made from dredged soil. The details of Super Geo Material are also reported in this paper.