Trial Design of Floating Airport for Next Generation SST

当在日本讨论下一代SST的建设时，很自然地得出结论，由于需要非常大的面积，并且由于噪音和环境问题，它将被安装在海上。因此，在本报告中，设计了一个大型浮动机场，预计处理7000万人次/年，并具有经济性，安全性和可靠性的导航和乘客控制的优势。该机场计划建在距九州-栗海岸20^-30米水深的海上，并与现有的成田机场结合管理。这两个机场由高速铁路，车道和使用垂直起降的航空公司连接。浮动机场也通过一座固定桥与陆地相连。当这些运输系统被采用时，SST机场将扮演所谓的登机口机场的角色，成田机场将扮演所谓的枢纽机场的角色，飞往东北亚地区的一些城市。该浮动机场由一个大型的栈桥作为航站楼和停机坪，四个超长的半潜式平台作为跑道组成。防波堤被分析为由安装在近海和近岸侧的两种填海人工岛支撑的刚性浮体，而跑道被分析为在跨中点和终点处支撑的弹性梁。通过这种方式，展示了下一代SST的新设计。为了从结构工程的角度更准确地进行设计，在同时存在高浪的条件下，对风荷载进行了试验研究。从这些试验中归纳出一些重要的资料，以评估升力和影响的设计。并对飞机着陆时浮动机场的运动特性进行了初步分析。

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.