ブックタイトル「近代の文化遺産の保存理念と修復理念」英語版

概要

「近代の文化遺産の保存理念と修復理念」英語版

39deflected greatly that the train was entirelyhidden from sight, which indicates that thebridge sank somewhere from four to five meters.　Research for including this bridge as anominee for “20th-Century Heritage 20”revealed that there were various technicaldifficulties that had to be overcome indeveloping Seto Ohashi Bridge, includingdevices for controlling the expansion of rails,which was realized by employing an anchoragesystem. Although not very visually attractive, ahuge anchorage system was introduced betweenthe two suspension bridges for minimumdeflection.5) Seikan TunnelIt was the first tunnel to be constructedunder an ocean and is highly evaluated as anexample of a technical breakthrough. In tunnelconstruction, one of the most feared accidentsis water inrush. Although in mountain tunnels,the water resource will eventually be exhausted,in tunnels under the ocean, the amount of thesurrounding water is unlimited. Constructionwork of the Seikan Tunnel was undertakenplacing topmost priority in countermeasures forsudden water intrusion. There were numerousinnovative technologies that enabled this verydifficult task and the largest three amongthose were the sophisticated know-how thatwas developed through advanced boring,cement injection, and spraying of concrete.Firstly, preliminary testing by long horizontalboring is executed to determine the geologyand conditions of water inflow of the groundahead. When water infiltration is discovered,it is stopped before drilling, and cement andchemical agents are injected simultaneouslyto stop water seepage; after drilling, concreteis sprayed onto the surface to assure stabilityof the bedrock. Each of these techniqueswas developed owing to unrelenting creativeefforts, through trial and error. These threemajor methods employed in construction ofthe Seikan Tunnel were then coined “the ThreeSacred Treasures” 10).6) Maizuru’s Military Urban InfrastructureIn Maizuru where the present city planningwas executed by the former Japanese Navy,there remain urban facilities, includingmilitary facilities, military water systems, and aHoffmann brick kiln in the vicinities.7) S u m i d a - g a w a R i v e r B r i d g e s a n dEarthquake Recovery Project BridgesThe nomenclature for this group of sitescould have been earthquake recovery projectbridges (A series of bridges over SumidagawaRiver were reconstructed after the KantoEarthquake in 1923), but considering myposition as the representative of a group tosupport preservation activities and to “Raise theKachidoki-bashi Bridge,” I wanted to includeKachidoki-bashi Bridge and thus namedthem Sumida-gawa River Bridges. In 2007,three bridges - Eitai, Kiyosu, and KachidokiBridges - were designated by the country asImportant Cultural Properties, for which thetitle of Sumida-gawa River Bridges wouldbe appropriate. Although these earthquakerecovery projects also include elementaryschools and adjacent small-scale parks as wellas the three large parks of Sumida, Hamacho,and Kinshicho and other facilities, the subjectwas limited to bridges to keep the story simple.8) Hisatsu Line, Kyushu Railway Company（Former Kagoshima Main Line）Facilities of the Hisatsu Line that are still in