Haneda Airport is a major airport of the metropolitan region of Japan. Further expansion of its runways is under consideration. A thorough study based on site condition has been carried out by our committee. Finally it was concluded that the combined construction method would be the most appropriate. This method consists of land reclamation and pile-supported jacket structures, and the latter are applied to the estuary area of the Tamagawa River. The advantages of this method are apparent in its reliability, operation safety, environmental creativity and cost efficiency. Thus the application of this method for offshore runway construction will derive the most stable and cost effective expanded runway.

The floating (megafloat) concept has distinguishing characteristics - earthquake-proof, eco-friendly, short construction schedule and economically efficient. In the further expansion of Haneda Airport, Japan's high-tech floating method, which was developed by Japan's cutting edge of technology and has a lot of distinct qualities revered around the world, is considered to be the best.