Trial Design of Floating Airport for Next Generation SST

当日本讨论建设下一代SST时，很自然地得出结论，它将安装在海上，因为需要很大的面积，也因为噪音和环境问题。因此，在本报告中，设计了一个大型浮动机场，预计年旅客吞吐量7000万人次，在航行和旅客管制方面具有经济、安全和可靠的优势。该机场计划建在距久州-栗里海岸水深20^-30米的海域，并与现有的成田机场结合管理。这两个机场都通过高铁、车道和使用VTOL的航道连接起来。浮动机场还通过一座固定的桥梁与陆地相连。当这些交通系统被采用时，SST机场将起到所谓的大门机场的作用，成田机场将起到飞往东北亚地区多个城市的所谓枢纽机场的作用。这个漂浮机场由一个大型航站楼和停机坪和四个非常长的半潜式跑道组成。Burge被分析为由安装在近岸和近岸的两种填海人工岛支撑的刚性浮体，而跑道被分析为跨中和末端支承的弹性梁。通过这种方式，展示了下一代SST的新设计。为了从结构工程角度更准确地进行设计，对高波浪同时存在条件下的风引起的升力进行了试验研究。从这些实验中得出了一些关于升力评估和对设计的影响的重要信息。此外，还对飞机着陆时漂浮机场的运动特性进行了基本分析。

When construction of the next generation SST is discussed in Japan, it is natural to conclude that it will be installed at the sea because of necessity of very large area, and also due to noise and environmental problems. Therefore, in this report, a large scale floating airport is designed, which is expected to handle 70 million passengers/year and to have superiority in economy, safety and reliability on navigation and passenger controls. This airport is planned to be constructed at the sea whose water depth is 20^-30m off Kuju-Kuri coast and to be managed in combination with existing Narita Airport. Both airports are connected by a high speed railway, a drive way and an airway using VTOLs. The floating airport is also connected by a fixed bridge with land. When these transportation systems are adopted, SST airport will play a role of so called gate airport and Narita airport will play a role of so called hub airport for flying to a number of cities in North-East Asia area. This floating airport consistts of a large scale burge as terminal and apron and four very long semisubmersibles as runways. The burge was analyzed as a rigid floating body supported by two kinds of reclamated artificial islands installed at offshore and nearshore sides, while the runways were analyzed as elastic beams supported at midspan point and at terminal point. In this way, an new design of the next generation SST was shown. In order to make the design more accurate from structural engineering aspect, lift force due to wind was experimentally studied under the condition of simultaneous existence of high waves. Some important informations on evaluation of lift force and on the effects on the design were induced from these experiments. Moreover, foundamental analyzes were made on behaviors of floating airport when airplane is landing.